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Ramesh K, Thirunavukkarasu K. Decoding Age-Linked Masseter Vestibular Evoked Myogenic Potential Changes in Healthy, Aging Individuals. Am J Audiol 2024; 33:838-849. [PMID: 38843439 DOI: 10.1044/2024_aja-23-00264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024] Open
Abstract
PURPOSE The primary objective of this study was to assess how age influences masseter vestibular evoked myogenic potential (mVEMP) parameters by utilizing 500-Hz tone burst stimuli delivered through air conduction. METHOD The study involved 110 participants ranging from 15 to 60 years of age, grouped into five categories, all of whom had no previous issues related to their vestibular system. The participants were exposed to 500-Hz tone burst stimuli at 125 dB SPL through ER-3A inserts. These stimuli were presented to one ear at a time, with alternating polarity. A Tukey's honestly significant difference test was conducted to compare rectified and unrectified amplitude, along with latencies (P11 and N21) and the asymmetric ratio across all age groups. Additionally, a multivariate analysis of variance was performed to assess the impact of sex on the study variables. RESULTS All 110 participants (220 ears) in the study provided mVEMP responses, encompassing 100% of the subjects. The results revealed a significant reduction in both amplitude and latency extension for the P11 and N21 peaks. Interestingly, P11 latency was also prolonged in the youngest participants (Group 1), suggesting ongoing maturation of the system even beyond the age of 16 years. Moreover, a significant sex difference was observed in the P11 latencies. However, there were no substantial sex differences (p > .05) in N1 peak latency, peak-to-peak amplitude, rectified amplitude, and asymmetric ratio. CONCLUSIONS Changes in structure occur due to degeneration, and the quantity of vestibular sensory hair cells gradually diminishes with age. The rate of decline is faster in semicircular canals compared to end organs, as observed by Merchant et al. (2000). Following a linear degeneration starting at the age of 40 years, a continuous reduction in sensory cells and primary neurons takes place until approximately 40% of vestibular sensory cells are lost by the age of 75 years and insufficient maturation can lead to prolonged peaks and reduced amplitudes compared with those that are considered normal. Therefore, it is crucial to consider the age of the participants when making diagnoses and incorporate relevant correction factors based on age-related reference data.
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Affiliation(s)
- Karan Ramesh
- Department of Audiology and Speech-Language Pathology, SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
| | - Kumaran Thirunavukkarasu
- Department of Audiology and Speech-Language Pathology, SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India
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Dresner R, Mehta S, Upadhyay M, El-Bialy T, Kuo CL, Tadinada A, Yadav S. Positional, morphologic, and volumetric differences in TMJ in unilateral posterior crossbites and controls: A retrospective CBCT study. Int Orthod 2024; 22:100889. [PMID: 38833956 DOI: 10.1016/j.ortho.2024.100889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/08/2024] [Accepted: 05/10/2024] [Indexed: 06/06/2024]
Abstract
OBJECTIVES The objective of this study was to evaluate if there are any morphologic, positional, and volumetric differences in the temporomandibular joint (TMJ) of patients with unilateral posterior crossbite (UPC) compared to controls. Another objective was to analyse the discrepancy in the TMJ between the crossbite versus non-crossbite side in UPC versus right and left sides in controls. Additionally, this study aimed to evaluate the differences in the bone density at the masseteric insertion site at the angle of mandible in the UPC group and control group. MATERIAL AND METHODS One hundred and thirty-two CBCTs were analysed with 66 patients in UPC group and 66 patients in control group (non-crossbite). Temporomandibular joint spaces - Anterior joint space (AJS), Superior joint space (SJS), Posterior joint space (PJS), Medial joint space (MJS), Middle joint space (MiJS), and Lateral joint space (LJS) were measured. Additionally, bone density at angle of mandible and volume of mandibular condyle were evaluated. The measurements were compared between the groups as well as between the crossbite and non-crossbite sides within the UPC group and between right and left sides within the control group. Furthermore, the associations between UPC and changes in TMJ regarding joint space availability, bone density, condylar head volume, and the effects of sex and age were evaluated using regression analysis. RESULTS It was observed that UPC group showed a greater condylar volume, than the control group. Additionally, a larger mean discrepancy was observed between the crossbite side and non-crossbite side within the UPC group concerning condylar volume than controls. Concerning age, condylar volume was observed to be larger in adults than children. Adults showed significantly greater bone density and condylar volume than adolescents. Concerning sex, it was observed that males showed a larger SJS (right), MiJS, LJS, and bone density at the mandibular angle than females. CONCLUSION There is a difference in the TMJ parameters particularly condylar volume in patients with UPC compared to controls.
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Affiliation(s)
| | - Shivam Mehta
- Department of Orthodontics, Texas A&M University School of Dentistry Dallas, 75246 Texas, USA.
| | - Madhur Upadhyay
- Division of Orthodontics, Department of Craniofacial Sciences, Health Center Farmington, University of Connecticut, 06030 Connecticut, USA
| | - Tarek El-Bialy
- Division of Orthodontics, Department of Craniofacial Sciences, Faculty of Medicine and Dentistry, 7-020D Katz Group Centre for Pharmacy and Health Research, University of Alberta, T6G 2E1 Edmonton, Alberta, Canada
| | - Chia-Ling Kuo
- Department of Public Health Sciences, University of Connecticut, Health Center, CT 06030 Farmington, USA
| | - Aditya Tadinada
- Section of Oral and Maxillofacial Radiology, Department of Craniofacial SciencesUniversity of Connecticut, Health Center, CT 06030 Farmington, USA
| | - Sumit Yadav
- Henry and Anne Cech Orthodontic Foundation, UNMC College of Dentistry and Children's Hospital and Medical Center Lincoln, Omaha, NE, USA
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Carvalho MR, Molena KF, Regalo SCH, Gonçalves LMN, de Paula-Silva FWG, Vicioni-Marques F, de Vasconcelos PB, de Carvalho FK, de Queiroz AM. Analysis of the stomatognathic system functions and mastication muscles in children affected by molar hypomineralization (MH): a cross-sectional study. Eur Arch Paediatr Dent 2024:10.1007/s40368-024-00925-3. [PMID: 38969936 DOI: 10.1007/s40368-024-00925-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 06/20/2024] [Indexed: 07/07/2024]
Abstract
PURPOSE To analyze the functions of the stomatognathic system in children with or without molar-incisor hypomineralization (MIH). METHODS For this cross-sectional study, 72 children aged 6-12 years were recruited and divided in two groups: with MIH (G1) and without MIH (G2). T-SCAN was used to verify the distribution of occlusal contacts, gnathodynamometer to measure maximum molar bite force, and Iowa Oral Pressure Instrument (IOPI) to assess the strength of facial expression muscles. The t test and paired t test (p ≤ 0.05) were used for statistical comparisons. RESULTS The molars affected by MIH exhibited lower distribution of occlusal forces (p < 0.001) and lower maximum molar bite force (p < 0.05) compared to the molars in the control group. However, there was no difference between the MIH-affected sides compared to the unaffected side, nor between the molars affected by MIH and their antagonists (p > 0.05). There were no differences in the forces of the facial expression muscles between the groups. CONCLUSIONS These findings suggest that MIH significantly impacts occlusal force distribution and bite force, but not facial expression musculature.
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Affiliation(s)
- M R Carvalho
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
| | - K F Molena
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
| | - S C H Regalo
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - L M N Gonçalves
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
| | - F W G de Paula-Silva
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
| | - F Vicioni-Marques
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
| | - P B de Vasconcelos
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - F K de Carvalho
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil.
| | - A M de Queiroz
- Ribeirão Preto School of Dentistry, University of São Paulo, Av. Do Café, Ribeirao Preto, São Paulo, Brazil
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Jiang Q, Wang Z, Zhang S, Liu X, Fu B. Performance of Bonded Lithium Disilicate Partial-coverage Crowns in the Restoration of Endodontically Treated Posterior Teeth: An Up to Seven-Year Retrospective Study. Oper Dent 2024; 49:365-375. [PMID: 38978317 DOI: 10.2341/23-107-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2024] [Indexed: 07/10/2024]
Abstract
OBJECTIVES To evaluate the clinical performance of adhesively bonded lithium disilicate glass-ceramic (LDG) partial-coverage crowns in restoring posterior endodontically treated teeth (ETT). METHODS AND MATERIALS A total of 121 morphologically compromised posterior ETT were restored with LDG partial-coverage crowns between October 2015 and January 2018. The restorations were fabricated in the laboratory or at the chairside. Two adhesive systems and resin cements were used to cement the restorations. Tooth and restoration survival rates were calculated. The restorations were evaluated clinically using the modified United States Public Health Service (USPHS) criteria for an observation period of 5-7 years. The Cox proportional hazards model was used to estimate relative failure risks such as tooth type, resin cements, gender, and sleep bruxism. The standard chi-squared test was used to compare the survival of different tooth types for significant differences (α=0.05). In addition, survival probability was calculated using the Kaplan-Meier algorithm. RESULTS Among seven failed cases, one was a tooth fracture, and six were restoration fractures. According to the Kaplan-Meier analysis, the estimated survival rate of the teeth was 99% for seven years, while the estimated survival rate of the restorations was 94.8% for 5 years and 92.8% for 7 years. Tooth type and resin cements did not influence restoration survival rates (p>0.05), while sleep bruxism and male patients might increase the risk of failure (p<0.05). CONCLUSIONS The indirect adhesively bonded LDG partial-coverage crowns of posterior ETT exhibited favorable clinical outcomes. Ceramic fracture was the most common failure pattern.
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Affiliation(s)
- Q Jiang
- Qin Jiang, MD, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - Z Wang
- Zhe Wang, PhD, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - S Zhang
- Sisi Zhang, BDS, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - X Liu
- Xiaochen Liu, PhD, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
| | - B Fu
- *Baiping Fu, DMD, Department of Prosthodontic, Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, China
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Machado RR, Palinkas M, de Vasconcelos PB, Gollino S, Arnoni VW, Prandi MVR, Regalo IH, Siéssere S, Regalo SC. Lower limb balance, ankle dorsiflexion, orofacial tissue pressure, and occlusal force of rugby players. SPORTS MEDICINE AND HEALTH SCIENCE 2024; 6:173-178. [PMID: 38708318 PMCID: PMC11067736 DOI: 10.1016/j.smhs.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 11/11/2023] [Accepted: 12/04/2023] [Indexed: 05/07/2024] Open
Abstract
This cross-sectional study examined the lower limb balance, ankle dorsiflexion, orofacial tissue pressure, and occlusal strength of rugby players. Twenty-six participants were divided into groups: rugby players (n = 13) and healthy sedentary adults (n = 13). Participants underwent an analysis of lower limb balance using a composite score (Y-Balance Test). Ankle dorsiflexion was measured using the Lunge Test. The Iowa Oral Performance Instrument was employed to measure orofacial tissue pressure. Bite force was measured with a dynamometer, and T-Scan assessed occlusal contact distribution. Data were analyzed using the t-test (p < 0.05) and ANCOVA with age and weight as covariates, where it is possible to verify that these factors did not influence the results obtained. Significant differences were observed in the balance of the right (p = 0.07) and left (p = 0.02) lower limbs, where rugby players had lower composite scores. There were significant differences in the right (p = 0.005) and left (p = 0.004) lunges, with rugby players showing lower values, as well as lower tongue pressure (p = 0.01) and higher lip pressure (p = 0.03), with significant differences to sedentary participants. There was no significant difference in molar bite force and distribution occlusal contacts between groups. Rugby seems to reduce lower limb displacement, cause ankle hypomobility, lead to changes in orofacial tissues, particularly the tongue and lips. This study is significant for identifying significant differences between rugby players and sedentary individuals, providing new insights into the impact of rugby on health and performance, which can benefit sports training and injury prevention.
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Affiliation(s)
- Rafael R. Machado
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
| | - Marcelo Palinkas
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | | | - Sara Gollino
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
| | | | | | - Isabela H. Regalo
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
| | - Selma Siéssere
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - Simone C.H. Regalo
- School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
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Patil R, Khubchandani M, Kanani H, Yeluri R, Dangore-Khasbage S. Unravelling the Complexities of Bite Force Determinants in Paediatric Patients: A Literature Review. Cureus 2024; 16:e60630. [PMID: 38903313 PMCID: PMC11187438 DOI: 10.7759/cureus.60630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Accepted: 05/19/2024] [Indexed: 06/22/2024] Open
Abstract
The amount of maximum voluntary bite force (MVBF) is determined by the combined action of the jaw elevator muscles, which are altered jaw biomechanics and reflex processes. Bite force (BF) measurements can yield valuable information on the activity and function of the jaw muscles. The accuracy of biting force measurements depends on several variables, including age, gender, malocclusion, dental caries, dental prostheses and temporomandibular joint (TMJ). This information is essential for evaluating the development and function of the masticatory system, identifying potential abnormalities or impairments and guiding appropriate treatment interventions for paediatric patients. The aim of this article is to review the literature on the factors affecting bite force and the importance of these factors in assessing dental development and guiding interventions for paediatric patients with bite force-related issues. Additionally, establishing normative values for bite force in different age groups can aid in monitoring growth and detecting any deviations from expected patterns. Measuring bite force in paediatric patients is significant in comprehensive oral health assessment and management.
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Affiliation(s)
- Rutuja Patil
- Pedodontics and Preventive Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Monika Khubchandani
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Harikishan Kanani
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Ramakrishna Yeluri
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Suwarna Dangore-Khasbage
- Oral Medicine and Radiology, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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Su JN, Pan YH, Dorj O, Lin JCY, Salamanca E, Chen IW, Wu YF, Chang WJ. Association between oral health status and occlusal bite force in young adults. J Dent Sci 2024; 19:1182-1189. [PMID: 38618102 PMCID: PMC11010718 DOI: 10.1016/j.jds.2023.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/13/2023] [Indexed: 04/16/2024] Open
Abstract
Background/purpose Oral health is related to general health and a person's overall well-being. The aim of the present study was to explore the association between oral health status and bite force among young adults. Materials and methods Maximum bite force (MBF) was measured using Dental Prescale II in conjunction with a pressure-sensitive film and bite force analyzer in 40 young adults aged 20 to 40. Supragingival dental plaque was collected and cultured. Plaque weight, pH, and colony counts were assessed. The decayed, missing, and filled teeth index (DMFT) and body mass index (BMI) were recorded. Results Bite force was negatively correlated with the number of missing teeth and the sum of missing and filled teeth. When the filled-to-remaining-teeth ratio (F/R ratio) was less than 8%, the bite force was significantly higher compared to an F/R ratio of 8-25%. Additionally, the amount of total bacteria was positively correlated with total bite force, and the quantity of Streptococcus mutans (S. mutans) along with total bacteria was positively correlated with bite force in the molar region (∗P < 0.05). The molar region predominantly contributed to bite force. Conclusion Elevated levels of cariogenic bacteria may increase the risk of tooth loss, subsequently leading to reduced bite force. This reduction in bite force can further impact the efficiency of chewing function and, consequently, the quality of life. An F/R ratio above 8% could be easily calculated clinically and could serve as a guide to identify patients, particularly young adults, at risk of reduced bite force.
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Affiliation(s)
- Jo-Ning Su
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yu-Hwa Pan
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Department of Dentistry, Chang Gung Memorial Hospital, Taipei, Taiwan
- Graduate Institute of Dental and Craniofacial Science, Chang Gung University, Taoyuan, Taiwan
- School of Dentistry, College of Medicine, China Medical University, Taichung, Taiwan
| | - Odontuya Dorj
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Department of Dental Technology and Dental Hygiene, School of Dentistry, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Jerry Chin-Yi Lin
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Eisner Salamanca
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - I-Wen Chen
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yi-Fan Wu
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
| | - Wei-Jen Chang
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan
- Dental Department, Taipei Medical University, Shuang-Ho Hospital, New Taipei City, Taiwan
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Medeiros LH, de Barros SP, Fidelis da Silva LV, Bueno PM, Garcia-Usó M, Trindade-Suedam IK. Bite Force, Masticatory Performance, and Nutritional Status of Adult Individuals With Treacher Collins Syndrome. Cleft Palate Craniofac J 2024; 61:566-573. [PMID: 36544279 DOI: 10.1177/10556656221132376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024] Open
Abstract
OBJECTIVE To characterize the stomatognathic system of individuals with Treacher Collins syndrome (TCS) by assessing bite force (BF) and masticatory performance (MP) and to evaluate the nutritional status (NS) of this population through anthropometric measurements. DESIGN Cross-sectional study. SETTING A public tertiary care hospital. PATIENTS Forty-one individuals were divided into 2 groups: (1) Control (CON): 20 control adults with class I skeletal pattern and (2) TCS: 21 adults with TCS. INTERVENTIONS BF measurement was assessed using a gnathodynamometer (IDDK Kratos). MP assessment was done using Image J-NIH software, by calculating the particles size of food submitted to standard chewing cycles ). NS was assessed based on body mass index (BMI). MAIN OUTCOME MEASURES Based on the craniofacial dysmorphology, it is our hypothesis that this population present a dysfunctional masticatory system, which can negatively impact NS. RESULTS Means BF values for the TCS were significantly reduced when compared with the CON group and corresponded to 170.9 ± 109.4N and 431.6 ± 134.1N (right molar [RM]) and 171.2 ± 93.9N and 427.4 ± 147.8N (left molar [LM]), respectively (P < .05). Although no significant differences were observed, the mean particle size of the TCS was greater when compared with the CON group and corresponded to 1.58 ± 1.93 mm2 and 0.66 ± 0.52 mm2, respectively. Although statistically similar mean values of BMIs were observed on both groups (CON = 23.4 ± 4.7/TCS = 23.4 ± 6.1), underweight and overweight individuals were found in 48% of the individuals with TCS and in 15% of the CON group participants. CONCLUSION Individuals with TCS showed a significant BF reduction, but no differences were observed in MP and NS when compared with the control individuals.
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Affiliation(s)
- Laís Hollara Medeiros
- Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil
| | - Suely Prieto de Barros
- Department of Clinical Nutrition, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil
| | - Leide Vilma Fidelis da Silva
- Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil
| | - Patricia Martins Bueno
- Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil
| | - Michele Garcia-Usó
- Department of Biological Sciences, Dental School of Ourinhos, UNIFIO, Ourinhos, São Paulo, Brazil
| | - Ivy Kiemle Trindade-Suedam
- Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, São Paulo, Brazil
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
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Prasitwuttisak S, Chantarapanich N, Apinyauppatham K, Poomparnich K, Inglam S. Clinical challenges of biomechanical performance of narrow-diameter implants in maxillary posterior teeth in aging patients: A finite element analysis. PLoS One 2024; 19:e0299816. [PMID: 38527030 PMCID: PMC10962792 DOI: 10.1371/journal.pone.0299816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/15/2024] [Indexed: 03/27/2024] Open
Abstract
This study evaluated the biomechanical performance of narrow-diameter implant (NDI) treatment in atrophic maxillary posterior teeth in aging patients by finite element analysis. The upper left posterior bone segment with first and second premolar teeth missing obtained from a patient's cone beam computed tomography data was simulated with cortical bone thicknesses of 0.5 and 1.0 mm. Three model groups were analyzed. The Regimen group had NDIs of 3.3 × 10 mm in length with non-splinted crowns. Experimental-1 group had NDIs of 3.0 × 10 mm in length with non-splinted crowns and Experimental-2 group had NDIs of 3.0 × 10 mm in length with splinted crowns. The applied load was 56.9 N in three directions: axial (along the implant axis), oblique at 30° (30° to the bucco-palatal plane compared to the vertical axis of the tooth), and lateral load at 90° (90° in the bucco-palatal plane compared to the vertical axis of the tooth). The results of the von Mises stress on the implant fixture, the elastic strain, and principal value of stress on the crestal marginal bone were analyzed. The axial load direction was comparable in the von Mises stress values in all groups, which indicated it was not necessary to use splinted crowns. The elastic strain values in the axial and oblique directions were within the limits of Frost's mechanostat theory. The principal value of stress in all groups were under the threshold of the compressive stress and tensile strength of cortical bone. In the oblique and lateral directions, the splinted crown showed better results for both the von Mises stress, elastic strain, and principal value of stress than the non-splinted crown. In conclusion, category 2 NDIs can be used in the upper premolar region of aging patients in the case of insufficient bone for category 3 NDI restorations.
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Affiliation(s)
| | - Nattapon Chantarapanich
- Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University, Chonburi, Thailand
| | | | | | - Samroeng Inglam
- Faculty of Dentistry, Thammasat University, Pathumthani, Thailand
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Chotirungsan T, Tsutsui Y, Saka N, Kawada S, Dewa N, Magara J, Tsujimura T, Inoue M. Short-term and long-term effects of unilateral external carotid artery ligation on orofacial functions in rats. Am J Physiol Gastrointest Liver Physiol 2024; 326:G318-G329. [PMID: 38226423 DOI: 10.1152/ajpgi.00226.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/18/2023] [Accepted: 01/07/2024] [Indexed: 01/17/2024]
Abstract
The external carotid artery (ECA) plays a major role in supplying blood to the head and neck. Although impeded blood flow in the ECA is expected to affect orofacial functions, few studies have shown how blood flow obstruction in the ECA contributes to impairment of these functions, including chewing and swallowing. This study was performed to investigate the effects of ECA ligation (ECAL) on immediate and long-term changes in masticatory and swallowing functions as well as the jaw-opening reflex evoked in the digastric muscle. The experiments were carried out using male Sprague-Dawley rats. In the acute experiment, the digastric reflex evoked by low-threshold electrical stimulation of the inferior alveolar nerve and the swallow reflex, identified by digastric and thyrohyoid electromyographic (EMG) bursts, were compared between before and 1 h after ECAL. The chronic experiment was conducted on freely moving rats. EMGs of the masseter, digastric, and thyrohyoid muscles were chronically recorded. The long-term effects of ECAL on behavior and muscle histology were compared between rats with an intact ECA and rats with ECAL. In the acute experiment, the peak amplitude of the digastric reflex on the ECAL side was significantly decreased 1 h after ECAL. In the chronic experiment, although most parameters of the masticatory and swallowing EMGs were not significantly different between the groups, the results suggest wide variation of the effect of ECAL on the muscles. Blood supply compensation from collaterals of the internal carotid artery may be permanent in some animals.NEW & NOTEWORTHY The inhibitory effect of unilateral external carotid artery ligation (ECAL) on the ipsilateral digastric reflex was small but evident. Most parameters of masticatory and swallowing muscle activity were not significantly different after ECAL. Wide variation was noted in the effect of ECAL on the ipsilateral muscle activity. Blood supply compensation from collaterals of the internal carotid artery may occur in response to the impaired blood flow.
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Affiliation(s)
- Titi Chotirungsan
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
- Department of Oral Diagnosis, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
| | - Yuhei Tsutsui
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Nobuaki Saka
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Satomi Kawada
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Nozomi Dewa
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Jin Magara
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Takanori Tsujimura
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Makoto Inoue
- Division of Dysphagia Rehabilitation, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Regalo IH, Palinkas M, Gonçalves LMN, de Vasconcelos PB, Cappella A, Solazzo R, Ferreira CLP, Dolci C, Regalo SCH, Sforza C, Siessere S. Impact of obesity on the structures and functions of the stomatognathic system: A morphofunctional approach. Arch Oral Biol 2024; 159:105877. [PMID: 38183935 DOI: 10.1016/j.archoralbio.2023.105877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 11/27/2023] [Accepted: 12/24/2023] [Indexed: 01/08/2024]
Abstract
OBJECTIVE The prevalence of obesity is increasing significantly worldwide, raising great concern among health professionals. This observational study evaluated the electromyographic activity and thickness of the masseter and temporalis muscles, in addition to the maximum molar bite force, in obese and eutrophic subjects. METHODS Sixty subjects were divided into three groups: I (7-12 years), II (13-20 years), III (21-40 years) and sex: with 10 men and 10 women for each group. Electromyographic recordings of the masticatory muscles were obtained during mandibular tasks. The masticatory muscles thicknesses were obtained at rest and during dental clenching. The maximum molar bite forces were measured on the right and left sides. The difference in outcome measures between the groups and sex was analyzed using Mann-Whitney U test (p < 0.05) and analysis of covariance (ANCOVA). RESULTS Electromyographic activity in the masseter and temporal muscles consistently displayed lower levels in obese subjects of both sexes across all three age groups during mandibular tasks. Additionally, greater thickness of the masticatory muscles was observed in obese subjects of both sexes across all three age groups. Obese women in Group II displayed higher values of molar bite force, both on the right and left sides, compared to eutrophic women. On the other hand, women in Group III exhibited higher values of molar bite force on the right side in comparison to eutrophic women. CONCLUSIONS This study underscores the potential impact of obesity on the morphofunctional aspects of the stomatognathic system in subjects aged 7 to 40 years.
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Affiliation(s)
- Isabela Hallak Regalo
- Department of Basic and Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil; National Institute and Technology - Translational Medicine (INCT.TM), Brazil.
| | | | | | - Annalisa Cappella
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy; U.O. Laboratory of Applied Morphology, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Riccardo Solazzo
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | | | - Claudia Dolci
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil; National Institute and Technology - Translational Medicine (INCT.TM), Brazil
| | - Chiarella Sforza
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy
| | - Selma Siessere
- Department of Basic and Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil; National Institute and Technology - Translational Medicine (INCT.TM), Brazil
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12
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Koruyucu AN, Aşantoğrol F. Determination of masseter and temporal muscle thickness by ultrasound and muscle hardness by shear wave elastography in healthy adults as reference values. Dentomaxillofac Radiol 2024; 53:137-152. [PMID: 38211311 DOI: 10.1093/dmfr/twad013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/16/2023] [Accepted: 12/17/2023] [Indexed: 01/13/2024] Open
Abstract
OBJECTIVES The purpose of this study is to prospectively investigate the reference values of masseter and temporal muscle thicknesses by ultrasonography and muscle hardness values by shear wave elastography in healthy adults. METHODS The sample of the study consisted of a total of 160 healthy individuals aged between 18 and 59, including 80 women and 80 men. By examining the right and left sides of each participant, thickness and hardness values were obtained for 320 masseter muscles and 320 temporal muscles in total. RESULTS The mean masseter muscle thickness was found to be 1.09 cm at rest and 1.40 cm in contraction. The mean temporal muscle thickness was found to be 0.88 cm at rest and 0.98 cm in contraction. The thickness values of the masseter and temporal muscles were significantly greater in the male participants than in the female participants (P < .001). While there were significant differences between the right and left masseter muscle thickness values at rest and in contraction, the values of the temporal muscles did not show a significant difference between the sides. While the resting hardness (rSWE) of the masseter muscle was transversally 6.91 kPa and longitudinally 8.49 kPa, these values in contraction (cSWE) were found, respectively, 31.40 and 35.65 kPa. The median temporal muscle hardness values were 8.84 kPa at rest and 20.43 kPa in contraction. Masseter and temporal muscle hardness values at rest and in contraction were significantly higher among the male participants compared to the female participants (P < .001). CONCLUSION In this study, reference values for the thickness and hardness of the masseter and temporal muscles are reported. Knowing these values will make it easier to assess pain in the masseter and temporal muscles and determine the diagnosis and prognosis of masticatory muscle pathologies by allowing the morphological and functional assessments of these muscles, and it will identify ranges for reference parameters.
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Affiliation(s)
- Ayşe Nur Koruyucu
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Gaziantep University, 27310 Gaziantep, Turkey
| | - Firdevs Aşantoğrol
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Gaziantep University, 27310 Gaziantep, Turkey
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Altuwaijri SH, Champirat T, Wyatt C. Appointments Needed for Complete Denture for Frail Older Adults Residing in Long-Term Care Facilities: A Cross-Sectional Study. Dent J (Basel) 2024; 12:36. [PMID: 38392240 PMCID: PMC10888039 DOI: 10.3390/dj12020036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 02/01/2024] [Accepted: 02/02/2024] [Indexed: 02/24/2024] Open
Abstract
Frail older adults who reside in long-term care (LTC) facilities face multiple barriers in receiving dental care. In edentulous LTC patients, the fabrication of complete dentures (CDs) can present challenges, leading to an increase in procedural or post-insertion appointments. The aim of this cross-sectional study was to document the number of fabrication and post-insertion follow-up appointments for CDs in frail older adults residing in LTC facilities. Data were collected from electronic patient records (AxiUm) and the Index of Clinical Oral Disorder in Elders (CODE) software utilized by the University of British Columbia Geriatric Dentistry Program from 2002 to 2018. A total of 362 CDs were fabricated between 2002 and 2018 in 272 patients. The mean number of visits required was 4.13 and 4.32, with standard deviations (Std) of 1.45 and 1.25 needed to fabricate maxillary CDs and mandibular CDs, respectively. The mean number of follow-up visits was 1.04 for maxillary dentures and 1.09 for mandibular dentures, with an Std of 1.25 for both, similar to the results obtained for adult patients in community dental clinics. Several factors were found to be associated with an increased number of CD fabrication and follow-up visits. Pre-operative assessment of the patient's cognitive/physical status and intra-oral condition may indicate the estimated time needed to fabricate CDs.
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Affiliation(s)
- Sahr H Altuwaijri
- Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh 11426, Saudi Arabia
- King Abdullah International Medical Research Center, National Guard Health Affairs, Riyadh 11481, Saudi Arabia
| | - Tharee Champirat
- Department of Advanced General Dentistry, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand
| | - Chris Wyatt
- Division of Prosthodontics and Dental Geriatrics, Department of Oral Health Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
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Esposto DS, Palinkas M, Righetti MA, Taube OLS, Fernandes ALA, Chiaratto J, Ricardo V, Rufato FCTF, Regalo SCH, Siéssere S. Rheumatoid Arthritis and Osteoarthritis in Adult Women: A Functional Approach to the Stomatognathic System. Prague Med Rep 2024; 125:220-231. [PMID: 39171549 DOI: 10.14712/23362936.2024.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024] Open
Abstract
Rheumatoid arthritis and osteoarthritis both affect the articular cartilage, and are characterized by signs and symptoms that can affect the functions of the human body. This cross-sectional observational study evaluated electromyographic activity in the masseter and temporalis muscles, molar bite force, and mandibular mobility in adult women with rheumatoid arthritis or osteoarthritis. A total of 42 women were distributed into 3 groups: rheumatoid arthritis group (ARG, n=14); osteoarthritis group (OAG, n=14); and a healthy control group (CG, n=14). Electromyography was used to evaluate mandibular tasks at rest, right and left laterality, protrusion, and dental clenching during maximum voluntary contraction, with and without parafilm, and a dynamometer was used to analyse the right and left molar bite forces. A digital caliper was used to measure the range of mandibular movement for maximum mouth opening, right and left laterality, and protrusion. Statistical analyses were performed, including analysis of variance and Tukey's test (P<0.05). Electromyography showed no significant differences between the groups when evaluating the masticatory muscles during the mandibular tasks. Significant difference was observed between the ARG and CG, however, in the maximum right (P=0.007) and left (P=0.02) molar bite forces. Significant difference was observed in the maximum mouth opening of the ARG and OAG groups compared with that of the CG (P=0.009), suggesting that adult women with rheumatoid arthritis or osteoarthritis experience functional alterations in the stomatognathic system, particularly in molar bite force and maximum mouth opening.
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Affiliation(s)
- Danilo Stefani Esposto
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
- Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo and National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil.
| | - Mariah Acioli Righetti
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | | | - Anna Luísa Alves Fernandes
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Jéssica Chiaratto
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Vitória Ricardo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | | | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
- Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo and National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
| | - Selma Siéssere
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
- Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo and National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
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15
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Bogdanov V. Type of correlation between bite force and EMG activity of the temporalis and masseter muscles during maximal and submaximal clenching. Folia Med (Plovdiv) 2023; 65:975-985. [PMID: 38351788 DOI: 10.3897/folmed.65.e107180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 08/24/2023] [Indexed: 02/16/2024] Open
Abstract
INTRODUCTION Maximal bite force is an important determinant of masticatory function and is essential for the estimation of dental status. Bite force is usually measured by gnathodynamometry.
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Al-Watary MQ, Libin S, Yingyou H, Heyou G, Abotaleb BM, Sakran K, Li J. Three-dimensional radiographic assessment of different fixation methods stability after l-shaped osteotomy reduction malarplasty: A comparative retrospective study. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2023; 124:101454. [PMID: 36965815 DOI: 10.1016/j.jormas.2023.101454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 03/15/2023] [Indexed: 03/27/2023]
Abstract
BACKGROUND Reduction malarplasty (RM) is a common facial contouring procedure among Orientals. Currently, fixation methods selection and placement vectors are controversial. Therefore, this study aimed to evaluate the effect of different zygomatic complex fixation methods on surgical outcomes stability after RM. MATERIALS AND METHODS In this retrospective study, 60 consented patients (120 operated zygoma) who met inclusion criteria were included. ITK-SNAP and 3D Slicer software were used to measure the displacement of the zygomatic complex using postoperative CTs (T1: one week and T2: six months). The region of interest included zygomatic body fixation methods (ZBFm), namely: two bicortical screws (2LS); an l-shaped plate with one bicortical screw (LPLS); an l-shaped plate with short-wing on the zygoma (LPwZ) and on the maxilla (LPwM), combined with zygomatic arch fixation methods (ZAFm), including Mortice-Tenon (MT); 3-hole plate (3HP); and short screw (SS). ANOVA test was used to compare the displacement values among ZBFm/ZAFm combinations. RESULTS The 2LS and LPLS groups showed lower displacement than the single l-shaped plate (P< 0.001, P = 0.001), which performed better when the short-wing was fixated on the maxilla (0.9 ± 0.4 mm and 1.2 ± 0.6 mm respectively). CONCLUSION After RM, the two-bridge fixation methods (2LS and LPLS) provide better stability than the single l-shaped plate. All ZAF methods showed similar stability when combined with 2LS or LPLS as zygomatic body fixation methods.
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Affiliation(s)
- Mohammed Qasem Al-Watary
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Song Libin
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - He Yingyou
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Gao Heyou
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Bassam M Abotaleb
- Department of Oral and Maxillofacial surgery, Faculty of Dentistry, Ibb University, Yemen; Ibb University, Yemen
| | | | - Jihua Li
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Center of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
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Flores-Orozco EI, Ignatova-Mishutina T, Hernandez-Zamora MO, De-Haro-López C, Osuna-Hernández MG, Escobedo-Jiménez XP, Flores-Hernández FL, Rodríguez-Correa L, Rovira-Lastra B, Martinez-Gomis J. Side switch frequency while masticating different chewing materials, and its relationship with other masticatory behaviors and sensory perceptions. Arch Oral Biol 2023; 155:105804. [PMID: 37722154 DOI: 10.1016/j.archoralbio.2023.105804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/26/2023] [Accepted: 09/10/2023] [Indexed: 09/20/2023]
Abstract
OBJECTIVE This cross-sectional study aimed to establish normative values for masticatory side switch (MSS) frequency in young Mexican adults and to assess the relationship between various indices and MSS frequency when masticating different chewing materials. DESIGN We enrolled 101 dentate adults and performed four masticatory assays that involved masticating different chewing materials (i.e., two-colored chewing gum, sweet cracker, salty cracker, and bread). Participants were asked to eat and swallow these foods and to chew the gum for 40 cycles and the following indices were determined: MSS index (MSSI), unilateral chewing index, chewing cycle duration, and number of cycles before terminal swallowing. The participants then rated perceived flavor intensity, salivary flow, and muscle fatigue during each trial. RESULTS The MSSI ranged from 0.03-0.06 (10th percentile) to 0.48-0.54 (90th percentile). A repeated-measures general linear model revealed a mean MSSI value of 0.28 (95 %CI, 0.25-0.30) adjusted by several factors. Male sex, soft food, and the last chewing period were associated with lower MSS frequency. Spearman's test showed a high correlation for the MSSI among the different foods. MSSI correlated negatively with the unilateral chewing index for each chewing material and with number of cycles for the sweet cracker. However, no significant correlation was detected between MSSI and sensory perception. CONCLUSIONS In healthy dentate individuals, the mean MSS relative frequency is 25-30 % with an 80-central percentile of 5-50 % of the maximum possible side changes. Lower MSS frequencies were detected in men, when chewing soft food, and during the final chewing period.
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Affiliation(s)
- Elan Ignacio Flores-Orozco
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Tatiana Ignatova-Mishutina
- Department of Odontostomatology, Faculty of Medicine and Health Sciences, University of Barcelona, Campus de Bellvitge, Pavelló de govern, C/Feixa llarga, s/n 08907 L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Miranda Oryana Hernandez-Zamora
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Cristina De-Haro-López
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Mireya Guadalupe Osuna-Hernández
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Ximena Paola Escobedo-Jiménez
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Frida Livier Flores-Hernández
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Lizbeth Rodríguez-Correa
- Department of Prosthodontics, Faculty of Dentistry, Autonomous University of Nayarit, Edificio de la Unidad Académica de Odontología, Ciudad de la Cultura Amado Nervo, Tepic, C.P. 63155, Nayarit, Mexico
| | - Bernat Rovira-Lastra
- Department of Odontostomatology, Faculty of Medicine and Health Sciences, University of Barcelona, Campus de Bellvitge, Pavelló de govern, C/Feixa llarga, s/n 08907 L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, Campus de Bellvitge, C/Feixa llarga, s/n 08907 L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Jordi Martinez-Gomis
- Department of Odontostomatology, Faculty of Medicine and Health Sciences, University of Barcelona, Campus de Bellvitge, Pavelló de govern, C/Feixa llarga, s/n 08907 L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, Campus de Bellvitge, C/Feixa llarga, s/n 08907 L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain.
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18
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Kumar K, Kumar S, Khandpur M, Singh N, Singh BP, Garg RK. The effect of food supplements on completely edentulous women rehabilitated with complete dentures: A randomized controlled trial. J Indian Prosthodont Soc 2023; 23:347-355. [PMID: 37861611 DOI: 10.4103/jips.jips_237_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023] Open
Abstract
Aim Neglected oral health is a major issue, especially in women of developing countries, leading to early loss of teeth which may further lead to malnutrition, degradation of overall health, and increased chances of osteoporosis. Thus, the aim of this study was to assess the effect of food supplement on masticatory performance, nutritional status, electromyography (EMG) (masseter and temporalis), and bone mineral density (BMD) among women rehabilitated with complete denture. Settings and Design Hospital based randomized controlled trial. Materials and Methods A randomized controlled trial with 106 women of 45-65 years rehabilitated with complete denture (56 received food supplement and 50 did not receive food supplement) and 52 healthy control was conducted. The outcomes were assessed at baseline and 3 and 6 months of follow up (after complete denture fabrication). Outcomes were measured via masticatory performance, nutritional status (hemoglobin, serum calcium, albumin, and Vitamin D level), EMG of masseter and temporalis muscles, and BMD. Statistical Analysis Used Friedman's analysis of variance test was used as a nonparametric test, and the Statistical Package for the Social Sciences version 21.0 at a significance level of 0.05 was used for statistical analysis. Results A statistically significant change was observed during follow up for the group with food supplement for BMD, EMG, and masticatory performance. When biochemical parameters were assessed during follow up, no statistically significant change was observed for both groups (with and without food supplement), except for serum calcium level in group which received food supplement. Conclusion It was found that the magnitude of effect was remarkably meager in food supplement group which could be perhaps due to less time given for follow up period. Longer duration of trials would yield better results.
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Affiliation(s)
- Kapila Kumar
- Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Sumit Kumar
- Health Research, Multidisciplinary Research Unit, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Mani Khandpur
- Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Nishi Singh
- Department of Conservative Dentistry and Endodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Balendra Pratap Singh
- Department of Prosthodontics, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Ravindra Kumar Garg
- Department of Neurology, King George's Medical University, Lucknow, Uttar Pradesh, India
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Larsson A, Manuh J, Chrcanovic BR. Risk Factors Associated with Failure and Technical Complications of Implant-Supported Single Crowns: A Retrospective Study. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1603. [PMID: 37763722 PMCID: PMC10535933 DOI: 10.3390/medicina59091603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/25/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023]
Abstract
Background and Objectives: Implant-supported single crowns have become a routine approach for the replacement of missing single teeth, being considered as one of the most common ways of rehabilitation when adjacent teeth are healthy. The present retrospective study aimed to investigate the risk factors possibly associated with failure and technical complications of implant-supported single crowns and their supporting implants. Materials and Methods: Patients treated at one faculty (2009-2019) were considered for inclusion. Complications investigated included ceramic fracture/chipping, crown loss of retention/mobility, crown failure/fracture, loosening/loss/fracture of prosthetic screw, and implant failure/fracture. Any condition/situation that led to the removal/replacement of crowns (implant failure not included) was considered prosthesis failure. Univariate/multivariate Cox regression models were used to evaluate the associations between clinical covariates and failure. Results: 278 patients (358 crowns) were included. Mean ± SD follow-up was 56.5 ± 29.7 months. Seven implants (after a mean of 76.5 ± 43.7 months) and twenty crowns (21.3 ± 23.5 months) failed. The cumulative survival rate (CSR) for crowns was 93.5% after 5, remaining at 92.2% between 6 and 11 years. The most common reasons for crown failure were porcelain large fracture (n = 6), crown repeatedly loose (n = 6), and porcelain chipping (n = 5). Men and probable bruxism were identified in the Cox regression model as being associated with crown failure. The most common observed technical complications were mobility of the crown and chipping of the ceramic material, with the latter being observed even in crowns manufactured of monolithic zirconia. Cases with at least one technical complication (not considering loss of screw hole sealing) were more common among probable bruxers than in non-bruxers (p = 0.002). Cases of ceramic chipping were more common among bruxers than in non-bruxers (p = 0.014, log-rank test). Conclusions: Probable bruxism and patient's sex (men) were factors associated with a higher risk of failure of implant-supported single crowns.
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Affiliation(s)
- Adam Larsson
- Faculty of Odontology, Malmö University, 214 21 Malmö, Sweden; (A.L.); (J.M.)
| | - Justice Manuh
- Faculty of Odontology, Malmö University, 214 21 Malmö, Sweden; (A.L.); (J.M.)
| | - Bruno Ramos Chrcanovic
- Department of Prosthodontics, Faculty of Odontology, Malmö University, 214 21 Malmö, Sweden
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Roser CJ, Zenthöfer A, Lux CJ, Rues S. A new CAD/CAM tooth mobility simulating model for dental in vitro investigations. Clin Oral Investig 2023; 27:5131-5140. [PMID: 37410153 PMCID: PMC10492759 DOI: 10.1007/s00784-023-05133-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 06/22/2023] [Indexed: 07/07/2023]
Abstract
OBJECTIVES To validate a new tooth mobility simulating in vitro model for biomechanical tests of dental appliances and restorations. MATERIAL AND METHODS Load-deflection curves for teeth in CAD/CAM models (n = 10/group, 6 teeth/model) of the anterior segment of a lower jaw with either low tooth mobility (LM) or high tooth mobility (HM) were recorded with a universal testing device and a Periotest device. All teeth were tested before and after different ageing protocols. Finally, vertical load capacity (Fmax) was tested in all teeth. RESULTS At F = 100 N load, vertical/horizontal tooth deflections before ageing were 80 ± 10 µm/400 ± 40 µm for LM models and 130 ± 20 µm/610 ± 100 µm for HM models. Periotest values were 1.6 ± 1.4 for LM models and 5.5 ± 1.5 for HM models. These values were within the range of physiological tooth mobility. No visible damage occurred during ageing and simulated ageing had no significant effect on tooth mobility. Fmax values were 494 ± 67 N (LM) and 388 ± 95 N (HM). CONCLUSION The model is practical, easy to manufacture and can reliably simulate tooth mobility. The model was also validated for long-term testing, so is suitable for investigating various dental appliances and restorations such as retainers, brackets, dental bridges or trauma splints. CLINICAL RELEVANCE Using this in-vitro model for high standardised investigations of various dental appliances and restorations can protect patients from unnecessary burdens in trials and practice.
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Affiliation(s)
- Christoph J. Roser
- Department of Orthodontics and Dentofacial Orthopedics, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
| | - Andreas Zenthöfer
- Department of Prosthodontics, Heidelberg University Hospital, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
| | - Christopher J. Lux
- Department of Orthodontics and Dentofacial Orthopedics, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
| | - Stefan Rues
- Department of Prosthodontics, Heidelberg University Hospital, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
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21
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Bhattarai B, Vijayan SK, Swapna N. Comparison of Oropharyngeal Efficiency Between Two Popular Brands of Marie Biscuits. Indian J Otolaryngol Head Neck Surg 2023; 75:1687-1693. [PMID: 37636620 PMCID: PMC10447802 DOI: 10.1007/s12070-023-03709-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 03/15/2023] [Indexed: 08/29/2023] Open
Abstract
OBJECTIVE The main objective of the study was to compare four measures of TOMASS (number of bites, number of masticatory cycles, number of swallowing and total time taken) across brands of Marie biscuits and gender. METHODOLOGY The study employed a cross-sectional design with nonrandomized convenience sampling. A total of 60 participants (30 females and 30 males) were recruited for the study in the age range of 18 to 26 years. Prior to enrolment in the study, the participants were screened for potential speech and swallowing issues. Two commercially available crackers (biscuits) in India, Sunfeast Marie Light and Britannia Marie Gold were used. Video recordings of the participants eating the biscuits were analyzed to document four measures of TOMASS. RESULTS The mean values obtained on all the measures for males were lesser than mean values for females for both the biscuits. Mann-Whitney U test revealed a statistically significant difference across number of swallows and total time taken across gender. There were no significant differences across biscuits on the four TOMASS measures. CONCLUSION It can be concluded that the TOMASS measures were near similar for both brands of Marie biscuits. Thus, any of these two brands of Marie could be used for clinical swallow evaluation. However, gender needs to be kept in mind, while interpreting the results of TOMASS. Future studies need to be conducted with other brands of Marie biscuit and in other age groups.
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Affiliation(s)
- Biraj Bhattarai
- MSc. SLP, All India Institute of Speech and Hearing, Mysuru, India
| | - Syam Krishna Vijayan
- Junior Research Fellow, All India Institute of Speech and Hearing, Mysuru, India
| | - N Swapna
- Professor of Speech Pathology, All India Institute of Speech and Hearing, Mysuru, India
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22
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Rodriguez Betancourt A, Samal A, Chan HL, Kripfgans OD. Overview of Ultrasound in Dentistry for Advancing Research Methodology and Patient Care Quality with Emphasis on Periodontal/Peri-implant Applications. Z Med Phys 2023; 33:336-386. [PMID: 36922293 PMCID: PMC10517409 DOI: 10.1016/j.zemedi.2023.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 12/20/2022] [Accepted: 01/11/2023] [Indexed: 03/14/2023]
Abstract
BACKGROUND Ultrasound is a non-invasive, cross-sectional imaging technique emerging in dentistry. It is an adjunct tool for diagnosing pathologies in the oral cavity that overcomes some limitations of current methodologies, including direct clinical examination, 2D radiographs, and cone beam computerized tomography. Increasing demand for soft tissue imaging has led to continuous improvements on transducer miniaturization and spatial resolution. The aims of this study are (1) to create a comprehensive overview of the current literature of ultrasonic imaging relating to dentistry, and (2) to provide a view onto investigations with immediate, intermediate, and long-term impact in periodontology and implantology. METHODS A rapid literature review was performed using two broad searches conducted in the PubMed database, yielding 576 and 757 citations, respectively. A rating was established within a citation software (EndNote) using a 5-star classification. The broad search with 757 citations allowed for high sensitivity whereas the subsequent rating added specificity. RESULTS A critical review of the clinical applications of ultrasound in dentistry was provided with a focus on applications in periodontology and implantology. The role of ultrasound as a developing dental diagnostic tool was reviewed. Specific uses such as soft and hard tissue imaging, longitudinal monitoring, as well as anatomic and physiological evaluation were discussed. CONCLUSIONS Future efforts should be directed towards the transition of ultrasonography from a research tool to a clinical tool. Moreover, a dedicated effort is needed to introduce ultrasonic imaging to dental education and the dental community to ultimately improve the quality of patient care.
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Affiliation(s)
| | - Ankita Samal
- Department of Radiology, Medical School, University of Michigan, Ann Arbor, MI, USA
| | - Hsun-Liang Chan
- Department of Periodontology and Oral Medicine, Dental School, University of Michigan, Ann Arbor, MI, USA
| | - Oliver D Kripfgans
- Department of Radiology, Medical School, University of Michigan, Ann Arbor, MI, USA
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23
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Ortún-Terrazas J, Cegoñino J, Pérez Del Palomar A. In silico approach towards neuro-occlusal rehabilitation for the early correction of asymmetrical development in a unilateral crossbite patient. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2023; 39:e3688. [PMID: 36726272 DOI: 10.1002/cnm.3688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 01/09/2023] [Accepted: 01/29/2023] [Indexed: 05/13/2023]
Abstract
Neuro-occlusal rehabilitation (N.O.R.) is a discipline of the stomatognathic medicine that defends early treatments of functional malocclusions, such as unilateral crossbite, for the correction of craniofacial development, avoiding surgical procedures later in life. Nevertheless, N.O.R.'s advances have not been proved analytically yet due to the difficulties of evaluate the mechanical response after the treatment. This study aims to evaluate computationally the effect of N.O.R.'s treatments during childhood. Therefore, bilateral chewing and maximum intercuspation occlusion were modelled through a detailed finite element model of a paediatric craniofacial complex, before and after different selective grinding-alternatives. This model was subjected to the muscular forces derived from a musculoskeletal model and was validated by the occlusal contacts recorded experimentally. This approach yielded errors below 2% and reproduced successfully the occlusal, muscular, functional and mechanical imbalance before the therapies. Treatment strategies balanced the occlusal plane and reduced the periodontal overpressure (>4.7 kPa) and the mandibular over deformation (>0.002 ε) on the crossed side. Based on the principles of the mechanostat theory of bone remodelling and the pressure-tension theory of tooth movement, these findings could also demonstrate how N.O.R.'s treatments correct the malocclusion and the asymmetrical development of the craniofacial complex. Besides, N.O.R.'s treatments slightly modified the stress state and functions of the temporomandibular joints, facilitating the chewing by the unaccustomed side. These findings provide important biomechanical insights into the use of N.O.R.'s treatments for the correction of unilateral crossbite, but also encourage the application of computing methods in biomedical research and clinical practise.
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Affiliation(s)
- Javier Ortún-Terrazas
- Escuela Superior de Ingeniería y Tecnología (ESIT), Universidad Internacional de La Rioja (UNIR), Logroño, La Rioja, Spain
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
| | - José Cegoñino
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
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24
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Choi WS, Seo HS. Effects of Age Group, Gender, and Consumption Frequency on Texture Perception and Liking of Cooked Rice or Bread. Foods 2023; 12:foods12091793. [PMID: 37174331 PMCID: PMC10177980 DOI: 10.3390/foods12091793] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/13/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
This study aimed to determine whether and how three demographic factors-age group, gender, and consumption frequency-affect texture perception and liking of two staple foods-cooked rice and wheat bread. In total, 346 adults evaluated three cooked rice and four wheat bread samples in terms of three (hardness, stickiness, and chewiness) and four textural attributes (hardness, moistness, chewiness, and softness), respectively, on both 9-point intensity and 5-point Just-About-Right (JAR) scales. Liking of test samples was also rated on 9-point hedonic scales. Age group and gender differed in mean ratings, standard deviations, and JAR responses regarding textural attribute intensity and overall liking of test samples, while the effect of consumption frequency was minimal in this regard. Significant contributors of textural attributes to overall liking of cooked rice and wheat bread differed with age group, gender, and consumption frequency. Effects of age group, gender, and consumption frequency on texture perception and overall liking also varied with test samples. This study provides agricultural and food systems professionals with systematic evidence of how textural attribute perception and liking of foods can change based on demographics and test samples.
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Affiliation(s)
- Won-Seok Choi
- Department of Food Science and Technology, Korea National University of Transportation, Jeungpyeong-gun, Chungbuk 27909, Republic of Korea
| | - Han-Seok Seo
- Department of Food Science, University of Arkansas, Fayetteville, AR 72704, USA
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25
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Shiga H, Komino M, Yokoyama M, Sano M, Arakawa I, Nakajima K, Fujii S. Relationship between age and occlusal force in adults with natural dentition. Odontology 2023; 111:487-492. [PMID: 36169783 DOI: 10.1007/s10266-022-00750-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 09/20/2022] [Indexed: 10/14/2022]
Abstract
This study aimed to clarify the relationship between age and occlusal force in adults with natural dentition. A total of 385 adults (180 males and 205 females) with natural dentition participated in this study. Subjects were asked to perform maximum clenching for approximately 3 s, and the occlusal forces on both sides and habitual chewing side were calculated using a dental prescale. Regression analysis was performed by sex with occlusal forces on both sides and habitual chewing side as the dependent variable and age as the independent variable. In addition, all subjects were divided into three groups: young group (20-39 years), middle group (40-59 years), and old group (60 years and over), and the occlusal forces on both sides and habitual chewing side were compared among the three groups. The occlusal forces did not differ from 20 to 60 years old for both males and females, and the occlusal forces gradually decreased after 60 years old. The curve of the polynomial equation was the most suitable. The occlusal forces on both sides and the habitual chewing side were similar in the young and middle groups, and the values of the old group were significantly smaller than those of the other two groups. From these results, it was suggested that the occlusal force of adults with natural dentition does not differ from 20 to 60 years old and can be represented by a curve of a cubic polynomial, and it significantly decreases after 60 years old.
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Affiliation(s)
- Hiroshi Shiga
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
| | - Marie Komino
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Masaoki Yokoyama
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Mako Sano
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Ichiro Arakawa
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Kunihisa Nakajima
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Shigehisa Fujii
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
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26
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Lovera-Prado K, Vanaclocha V, Atienza CM, Vanaclocha A, Jordá-Gómez P, Saiz-Sapena N, Vanaclocha L. Barbed Dental Ti6Al4V Alloy Screw: Design and Bench Testing. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2228. [PMID: 36984107 PMCID: PMC10054258 DOI: 10.3390/ma16062228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND CONTEXT Dental implants are designed to replace a missing tooth. Implant stability is vital to achieving osseointegration and successful implantation. Although there are many implants available on the market, there is room for improvement. PURPOSE We describe a new dental implant with improved primary stability features. STUDY DESIGN Lab bench test studies. METHODS We evaluated the new implant using static and flexion-compression fatigue tests with compression loads, 35 Ncm tightening torque, displacement control, 0.01 mm/s actuator movement speed, and 9-10 Hz load application frequency, obtaining a cyclic load diagram. We applied variable cyclic loadings of predetermined amplitude and recorded the number of cycles until failure. The test ended with implant failure (breakage or permanent deformation) or reaching five million cycles for each load. RESULTS Mean stiffness was 1151.13 ± 133.62 SD N/mm, mean elastic limit force 463.94 ± 75.03 SD N, and displacement 0.52 ± 0.04 SD mm, at failure force 663.21 ± 54.23 SD N and displacement 1.56 ± 0.18 SD mm, fatigue load limit 132.6 ± 10.4 N, and maximum bending moment 729.3 ± 69.43 mm/N. CONCLUSIONS The implant fatigue limit is satisfactory for incisor and canine teeth and between the values for premolars and molars for healthy patients. The system exceeds five million cycles when subjected to a 132.60 N load, ensuring long-lasting life against loads below the fatigue limit.
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Affiliation(s)
- Keila Lovera-Prado
- CIRU-IMPLANT, S.L., Avenida Cornellà, 2-BJ, Esplugues de Llobregat, 08950 Barcelona, Spain
| | - Vicente Vanaclocha
- Department of Surgery, School of Medicine, University of Valencia, 46010 Valencia, Spain
| | - Carlos M. Atienza
- Biomechanical Engineer, Biomechanics Institute of Valencia, Polytechnic University of Valencia, 46022 Valencia, Spain
| | - Amparo Vanaclocha
- Biomechanical Engineer, Biomechanics Institute of Valencia, Polytechnic University of Valencia, 46022 Valencia, Spain
| | - Pablo Jordá-Gómez
- Hospital General Universitario de Castellón, 12004 Castellón de la Plana, Spain
| | | | - Leyre Vanaclocha
- Medius Klinik, Ostfildern-Ruit Klinik für Urologie, Hedelfinger Strasse 166, 73760 Ostfildern, Germany
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Gonçalves LMN, Palinkas M, Regalo IH, Gonçalves PN, de Vasconcelos PB, Matsumoto MAN, Siéssere S, Regalo SCH. Orthodontic treatment of children with anterior open bite and posterior crossbite: An analysis of the stomatognathic system. J Oral Biol Craniofac Res 2023; 13:117-124. [PMID: 37065972 PMCID: PMC10091141 DOI: 10.1016/j.jobcr.2022.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 10/21/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Dental malocclusions are deviations from normalities due to the inadequate growth and development of the dental arch which provides functional changes to the stomatognathic system. The aim of this longitudinal study was to evaluate the electromyographic activity (EMG) the masseter and temporalis muscles, strength of the orofacial tissues and occlusal force of children with anterior open bite (n = 15) and posterior crossbite (n = 20), 7 days after the removal of the orthodontic apparatus. A fixed horizontal palatal crib was used in the treatment of anterior open bite and the fixed appliances Hyrax or MacNamara was used in the treatment of posterior crossbite. EMG of the masticatory muscles was recorded using an electromyograph with wireless sensors during mandibular tasks. Habitual chewing was assessed using the integral of the linear envelope of the electromyographic signal in the masticatory cycles. The strength of the tongue and facial muscles was measured using the Iowa Oral Pressure Instrument. T-Scan was used to analyze the force of occlusal contact. Molar bite force was measured by digital dynamometer. Significant differences (p < 0.05) were found in the EMG data of the masseter and temporalis muscles in the static and dynamic mandibular tasks. There were no significant difference in strength of orofacial tissues, occlusal contact force and molar bite force 7 days after the removal of the orthodontic apparatus. The results of this study suggest that the orthodontic treatment of anterior open bite and posterior crossbite in children promoted functional alteration in the electromyographic activity of masseter and temporalis muscles.
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Affiliation(s)
- Lígia Maria Napolitano Gonçalves
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - Isabela Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Paula Napolitano Gonçalves
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Paulo Batista de Vasconcelos
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Mirian Aiko Nakane Matsumoto
- Department of Pediatric Clinic, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Selma Siéssere
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
| | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil
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Tatlı EC, Arslan ZB. Probable bruxism effects on masseter muscle thickness in children: ultrasonographic evaluation. Oral Surg Oral Med Oral Pathol Oral Radiol 2023; 135:456-461. [PMID: 36517372 DOI: 10.1016/j.oooo.2022.10.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 10/13/2022] [Accepted: 10/29/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To compare the masseter muscle thickness (MMT) of patients with probable sleep/awake bruxism and controls without bruxism in mixed dentition as measured with ultrasonography (USG), and to calculate the correlation of MMT with body mass index (BMI). STUDY DESIGN The diagnosis of probable bruxism was established based on the parents' reports of the children's behavior, habits, and discomfort, and the presence of clinical signs and symptoms such as attrition-type wear on the teeth and the presence of discomfort, fatigue, and/or pain in the jaw muscles on palpation during clinical examination. The bruxist study group and the control group each included 28 children. MMT was measured separately in relaxed and contracted positions in both groups using USG. The height and weight of the patients were recorded in order to calculate BMI. Statistical analysis was performed with significance established at P < .05. RESULTS MMT was found to be significantly larger in the study patients than in controls on the right and left sides in the relaxed and contracted positions (P < .001). No statistically significant correlation was found between MMT and BMI (P ≥ .134). CONCLUSIONS MMT as measured with USG can be a beneficial approach in diagnosing bruxism in children. The lack of correlation between MMT and BMI indicates that BMI would not be helpful in diagnosing bruxism.
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Affiliation(s)
- Esra Ceren Tatlı
- Department of Pedodontics, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey.
| | - Zeynep Betül Arslan
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey
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29
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Haroyan-Darbinyan E, Romeo-Rubio M, Río-Highsmith JD, Lynch CD, Castillo-Oyagüe R. 'Thermo-mechanical behavior of alternative material combinations for full-arch implant-supported hybrid prostheses with short cantilevers'. J Dent 2023; 132:104470. [PMID: 36842624 DOI: 10.1016/j.jdent.2023.104470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/27/2023] [Accepted: 02/02/2023] [Indexed: 02/26/2023] Open
Abstract
OBJECTIVES To compare the fracture resistance (FR) of three combinations of materials for full-arch maxillary implant-supported hybrid prostheses (HPs) with short cantilevers (≤ 10 mm). METHODS Maxillary HPs were fabricated and classified as follows (n = 5 each): Group-1 (CC-A, control): acrylic-resin-veneered Co-Cr frameworks; Group-2 (CF-A): acrylic-resin-veneered carbon-fiber mesostructures; and Group-3 (CF-R): composite-resin-veneered carbon-fiber frames. Specimens were thermal-cycled (5,000 cycles; 5 °C-55 °C; dwell time: 30 s). Vertical loads were applied until failure, first at the 10-mm-long cantilever (LC), and, afterwards, at the anterior region (AR), using a universal testing machine (crosshead speed: 0.05 mm/s). The fracture pattern was assessed by stereomicroscope and SEM. The one-way ANOVA, the Bonferroni, and the independent samples t tests, were run (α= 0.05). RESULTS At LC, CF-A, and CC-A samples exhibited the highest FR values (p< 0.001), showing no differences to each other. At AR, CC-A specimens recorded the highest FR, followed by CF-A samples (p< 0.001). CF-R HPs displayed the lowest FR at both locations (p< 0.001). The only group with differences between the tested sites was the CC-A, the AR being more resistant (p< 0.001). Most CC-A and CF-A HPs failed cohesively. CF-R prostheses mainly failed adhesively. CONCLUSIONS Maxillary HPs with short cantilevers (≤ 10 mm) made of Co-Cr or carbon-fiber veneered with acrylic resin demonstrated an adequate mechanical resistance (> 900 N). CLINICAL SIGNIFICANCE For maxillary HPs with cantilevers up to 10 mm, acrylic-veneered carbon- fiber mesostructures may be recommended, whereas coating carbon-fiber frames with composite resin seems not suitable.
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Affiliation(s)
| | - Marta Romeo-Rubio
- Faculty of Dentistry, Complutense University of Madrid (U.C.M.), Madrid, Spain
| | | | - Christopher D Lynch
- University Dental School & Hospital/ University College Cork, Wilton, Cork, Ireland
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Liu J, Yu S, Xu Y, Li J, Liu B, Liu S, Ning H, Xu D, Low SS. In situ quantitative assessment of food oral processing parameters: A review of feasible techniques and devices. J Texture Stud 2023; 54:3-20. [PMID: 36222444 DOI: 10.1111/jtxs.12728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 09/25/2022] [Accepted: 10/01/2022] [Indexed: 11/30/2022]
Abstract
Oral processing is a combination of various actions, the detailed description of which has always been the subject of relevant research. By means of imaging technology and sensory evaluation, more knowledge of oral processing have been accumulated. Presently, the advances in sensory technology have added quantitative parameters to the qualitative description of oral processing, which also enriched the specifics of each action. Previous studies have shown that oral processing includes lip closure, dental occlusion, masticatory muscles activity, tongue movement, and swallowing, whose processing contains rich information such as the movement of organ and the intensity of organ contacts. "Quantification" was taken in this review as the basic feature of in situ detection information, the relevant parameters and feasible methods for the quantitative description of each activity was recorded in detail. In addition, basic problems and feasible optimization schemes of the existing in situ detection device are also proposed in the hope of promoting the development of in situ detection device thus providing available information for the description of oral processing.
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Affiliation(s)
- Jingjing Liu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Shixin Yu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Yifei Xu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Jiangyong Li
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Boyu Liu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Shikun Liu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Haohao Ning
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Dongfu Xu
- College of Automation Engineering, Northeast Electric Power University, Jilin, China
| | - Sze Shin Low
- Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, Ningbo, China
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Noronha MDS, Carvalho MAD, Do AQ, Neto VGDA, Campos CH, Giannini M, Magne P. Effect of thickness and CAD-CAM material on fatigue resistance of endodontically treated molars restored with occlusal veneers. J Prosthodont 2023; 32:e19-e29. [PMID: 36087111 DOI: 10.1111/jopr.13606] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 09/06/2022] [Indexed: 11/30/2022] Open
Abstract
PURPOSE To evaluate the influence of the thickness and type of computer-aided design and computer-aided manufacturing (CAD-CAM) material on the fatigue resistance and failure mode of endodontically treated teeth (ETT) restored with occlusal veneers (OV). MATERIALS AND METHODS Seventy-five (N = 75) ETT were restored with Herculite XRV in the endodontic access. Five experimental groups (n = 15) were tested. Four groups had two different thicknesses (0.6-0.7 mm or 1.4-1.6 mm) and two different CAD-CAM materials: zirconia-reinforced lithium-silicate (LS/Celtra Duo) and composite resin (RC/Cerasmart). The fifth group (control) did not have occlusal veneers. All the specimens were subjected to accelerated fatigue (5 Hz frequency) with an occlusal load increasing up to 1800 N and 131,000 cycles. The number of cycles was recorded when the machine stopped or at the completion of the test. Fatigue resistance was analyzed using the Kaplan-Meier survival test (95% significance level, log-rank post hoc pairwise comparisons). The samples were categorized according to failure mode. The CAD-CAM materials were examined through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). RESULTS No differences were found between the thicknesses, regardless of the type of the CAD-CAM material. The thick LS OV outperformed the RC and control groups. The thin RC OV and control groups showed a higher percentage of repairable and possibly repairable failures than the other groups. LS was more homogeneous under SEM, and the EDS analysis detected Si and Zr, but not Li. CONCLUSIONS A larger thickness did not improve the resistance of the CAD-CAM materials. Thick LS showed a higher cumulative survival rate to fatigue than the RC and control groups. The direct composite alone (control) survived similarly to the experimental groups, except for the thick LS.
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Affiliation(s)
- Mayara Dos Santos Noronha
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, São Paulo, Brazil
| | | | - Anh Quynh Do
- Advanced Endodontics, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA
| | | | - Camila Heitor Campos
- Department of Oral Rehabilitation, School of Dentistry, Federal Fluminense University, Nova Friburgo, Brazil
| | - Marcelo Giannini
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, São Paulo, Brazil
| | - Pascal Magne
- Division of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA
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32
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Takashima M, Arai Y, Matsuzaki N, Yamazaki Y, Nishiyama H, Nohno K. Masseter muscle cross-sectional area and late implant failure: A case-control study. Clin Implant Dent Relat Res 2023; 25:313-320. [PMID: 36726209 DOI: 10.1111/cid.13189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/22/2023] [Accepted: 01/23/2023] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Occlusal overload is considered to be one of the causes of late implant failure. However, it is unclear whether the magnitude of the patient's occlusal force is a risk factor for late implant failure. PURPOSE This case-control study aimed to clarify the association between the cross-sectional area (CSA) of the masseter muscle and late implant failure. METHODS This case-control study was limited to implant-supported fixed prostheses. We compared cases with at least one late implant failure (n = 25 patients) to controls (n = 82 patients) without implant failure. Patients were matched by age, sex, year of surgery, jaw and tooth type, and bone graft. Log-rank and Cox proportional hazard regression analyses were used to identify possible risk factors for late implant failure. RESULTS The incidence of late implant failure was significantly associated with masseter muscle CSA ≥504.5 mm2 (hazard ratio: 4.43; 95% CI: 1.82-10.79; p < 0.01). CONCLUSION Higher masseter muscle CSA increases the risk of late implant failure.
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Affiliation(s)
- Makiko Takashima
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yoshiaki Arai
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Nanaka Matsuzaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Yuta Yamazaki
- Oral Implant and Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital, Niigata, Japan
| | - Hideyoshi Nishiyama
- Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Kaname Nohno
- Department of Oral Health and Welfare, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Masticaticatory muscles characteristics in relation to adiposity and general muscular fitness: a population-based study. Odontology 2023:10.1007/s10266-023-00785-1. [PMID: 36694084 DOI: 10.1007/s10266-023-00785-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 01/12/2023] [Indexed: 01/25/2023]
Abstract
There is still considerable controversy surrounding the impact of mastication on obesity. The aim of this study was to identify the interplay between the masticatory muscles, teeth, and general muscular fitness and how they contribute to body adiposity in a general German population. This cross-sectional study included 616 participants (300 male, 316 female, age 31-93 years) from the population-based Study of Health in Pomerania. The cross-sectional areas of the masseter, medial and lateral pterygoid muscles were measured using magnetic resonance imaging (MRI), muscular fitness assessed by hand grip strength (HGS) and body fat distribution was measured by bioelectrical impedance analysis (BIA) and MRI. The overall prevalence of obesity was high in our cohort. The cross-sectional area of the masseter muscles was positively associated with the number of teeth, body mass index (BMI) and HGS, and negatively associated with the BIA-assessed body fat when adjusted for age, sex, teeth, and BMI. Especially the correlation was strong (p < 0.001). Analogous relationships were observed between the masseter, HGS and MRI-assessed subcutaneous fat. These associations were most pronounced with masseter, but also significant with both pterygoid muscles. Though the masticatory muscles were affected by the number of teeth, teeth had no impact on the relations between masseter muscle and adiposity. Physical fitness and masticatory performance are associated with body shape, controlled and directed by the relevant muscles.
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Dorado S, Arias A, Jimenez-Octavio JR. Biomechanical Modelling for Tooth Survival Studies: Mechanical Properties, Loads and Boundary Conditions-A Narrative Review. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7852. [PMID: 36363451 PMCID: PMC9657341 DOI: 10.3390/ma15217852] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/02/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Recent biomechanical studies have focused on studying the response of teeth before and after different treatments under functional and parafunctional loads. These studies often involve experimental and/or finite element analysis (FEA). Current loading and boundary conditions may not entirely represent the real condition of the tooth in clinical situations. The importance of homogenizing both sample characterization and boundary conditions definition for future dental biomechanical studies is highlighted. The mechanical properties of dental structural tissues are presented, along with the effect of functional and parafunctional loads and other environmental and biological parameters that may influence tooth survival. A range of values for Young's modulus, Poisson ratio, compressive strength, threshold stress intensity factor and fracture toughness are provided for enamel and dentin; as well as Young's modulus and Poisson ratio for the PDL, trabecular and cortical bone. Angles, loading magnitude and frequency are provided for functional and parafunctional loads. The environmental and physiological conditions (age, gender, tooth, humidity, etc.), that may influence tooth survival are also discussed. Oversimplifications of biomechanical models could end up in results that divert from the natural behavior of teeth. Experimental validation models with close-to-reality boundary conditions should be developed to compare the validity of simplified models.
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Affiliation(s)
- Saúl Dorado
- Department of Mechanical Engineering, Escuela Técnica Superior de Ingeniería ICAI, Universidad Pontificia Comillas, 28015 Madrid, Spain
| | - Ana Arias
- Department of Conservative and Prosthetic Dentistry, School of Dentistry, Complutense University, 28040 Madrid, Spain
| | - Jesus R. Jimenez-Octavio
- Instituto de Investigación Tecnológica, Escuela Técnica Superior de Ingeniería ICAI, Universidad Pontificia Comillas, 28015 Madrid, Spain
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da Silva GP, Verri ED, Palinkas M, Gonçalves CR, Gonçalves PN, Lopes RFT, Gomes GGC, Regalo IH, Siéssere S, Regalo SCH. Impact of Hemorrhagic Stroke on Molar Bite Force: A Prospective Study. Prague Med Rep 2022; 123:181-187. [PMID: 36107446 DOI: 10.14712/23362936.2022.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
Abstract
Stroke is a neurological deficit of cerebrovascular origin that promotes physical impairments of adult individuals. The present study is aimed to demonstrate whether hemorrhagic stroke affects the maximum molar bite force. The prospective study carried in Centro Universitario Claretiano de Batatais, Brazil, determined the distribution of the sample into two groups: hemorrhagic stroke group (n=18, median age, 62.5 years) and disease-free group (n=18, median age, 62.0 years), with 10 men and 8 women in each group. Subjects were paired one-to-one (age and body mass index). The dynamometer was used to measure the maximum molar bite force (right and left). All analyses were performed with a significance level of 5% (Student's t-test). Differences were found on the right (p=0.048) and left (p=0.042) molar bite force, with lower bite force (both sides) in hemorrhagic stroke group. The study suggests that hemorrhagic stroke negatively affects the maximum molar bite force and necessitates changes in food intake to nutritious and softer consistency foods.
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Affiliation(s)
- Gabriel Pádua da Silva
- School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,UNIFAFIBE, Bebedouro, Brazil
| | - Edson Donizetti Verri
- Claretiano, University Center of Batatais, Batatais, Brazil.,School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Marcelo Palinkas
- Faculty Anhanguera, Ribeirão Preto, São Paulo, Brazil. .,National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil. .,School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
| | - Camila Roza Gonçalves
- Hospital do Amor, Barretos, Brazil.,School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | | | - Robson Felipe Tosta Lopes
- School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,UNIFAFIBE, Bebedouro, Brazil
| | | | | | - Selma Siéssere
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil.,School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Simone Cecilio Hallak Regalo
- National Institute for Translational Medicine (INCT-TM), Ribeirão Preto, Brazil.,School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
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Roser CJ, Rückschloß T, Zenthöfer A, Rammelsberg P, Lux CJ, Rues S. Orthodontic shear bond strength and ultimate load tests of CAD/CAM produced artificial teeth. Clin Oral Investig 2022; 26:7149-7155. [PMID: 35982349 DOI: 10.1007/s00784-022-04676-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 08/10/2022] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To investigate whether artificial CAD/CAM processed (computer-aided design/manufacturing) teeth could be a feasible option for the production of dental in vitro models for biomechanical testing. MATERIAL AND METHODS Disks (n = 10 per group) made from two different CAD/CAM-materials, one fiber-reinforced composite (FRC; Trinia, Bicon) and one polymethylmethacrylate-based resin (PMMA; Telio CAD, Ivoclar Vivadent), as well as bovine teeth (n = 10), were tested for their shear bond strength (SBS) and scored according to the adhesive remnant index (ARI). In addition, CAD/CAM-manufactured lower incisor teeth were tested for their ultimate load (Fu). RESULTS With regard to SBS, both PMMA (17.4 ± 2.2 MPa) and FRC (18.0 ± 2.4 MPa) disks showed no significant difference (p = 0.968) compared to bovine disks (18.0 ± 5.4 MPa). However, the samples differed with regard to their failure mode (PMMA: ARI 4, delamination failure; FRC: ARI 0 and bovine: ARI 1.6, both adhesive failure). With regard to Fu, FRC-based teeth could withstand significantly higher loads (708 ± 126 N) than PMMA-based teeth (345 ± 109 N) (p < 0.01). CONCLUSION Unlike PMMA-based teeth, teeth made from FRC showed sufficiently high fracture resistance and comparable SBS. Thus, FRC teeth could be a promising alternative for the production of dental in vitro models for orthodontic testing. CLINICAL RELEVANCE CAD/CAM-processed teeth made from FRC enable the use of standardized geometry and constant material properties. Using FRC teeth in dental in vitro studies has therefore the potential to identify differences between various treatment options with rather small sample sizes, while remaining close to the clinical situation.
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Affiliation(s)
- Christoph J Roser
- Department of Orthodontics and Dentofacial Orthopedics, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
| | - Thomas Rückschloß
- Department of Oral and Maxillofacial Surgery, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Andreas Zenthöfer
- Department of Prosthodontics, Heidelberg University Hospital, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, Germany
| | - Peter Rammelsberg
- Department of Prosthodontics, Heidelberg University Hospital, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, Germany
| | - Christopher J Lux
- Department of Orthodontics and Dentofacial Orthopedics, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany
| | - Stefan Rues
- Department of Prosthodontics, Heidelberg University Hospital, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, Germany
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Lan KW, Jiang LL, Yan Y. Comparative study of surface electromyography of masticatory muscles in patients with different types of bruxism. World J Clin Cases 2022; 10:6876-6889. [PMID: 36051132 PMCID: PMC9297420 DOI: 10.12998/wjcc.v10.i20.6876] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/22/2022] [Accepted: 05/22/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Bruxism is a rhythmic masticatory muscle activity that occurs involuntarily in a non-physiologically functional state. There is a lack of research classifying the functional status of masticatory muscles in patients with different mandibular movement types (centric clenching or eccentric grinding) of bruxism.
AIM To assess the differences of the masticatory muscle activity in patients with different types of bruxism.
METHODS A total of 21 subjects with centric bruxism (CB) and 21 subjects with eccentric bruxism (ECB) were screened from college students according to a questionnaire and their tooth wear features. Sixteen subjects with no bruxism were also recruited. The surface electromyography (EMG) signals of the temporalis anterior (TA) and superficial masseter muscle (MM) were measured in different mandibular positions and during the chewing task. The EMG amplitude and chewing cycle duration parameters were then analyzed.
RESULTS The CB group showed fewer muscle maximal motor units, with the MM being more pronounced, a higher proportion of muscle contractions to be recruited for the same load of chewing activity, and a longer chewing cycle. The ECB group showed more TA maximal motor units and higher MM activity on the non-working side in unilateral chewing.
CONCLUSION CB mainly affects the MM, and patients with CB show reduced masticatory muscle contraction efficiency and chewing cycle efficiency. ECB mainly affects the TA, and patients with ECB show enhanced contraction of non-functional lateral muscle bundles.
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Affiliation(s)
- Kai-Wen Lan
- Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Guangzhou 510080, Guangdong Province, China
| | - Liu-Lin Jiang
- Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Guangzhou 510080, Guangdong Province, China
| | - Ying Yan
- Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Guangzhou 510080, Guangdong Province, China
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Yoneyama T, Utsumi A, Ishizaki A, Takahashi M, Yamaguchi S, Asami T, Hironaka S. Can dentists contribute to early screening for developmental disorders in five-year-old children during health checkups? PEDIATRIC DENTAL JOURNAL 2022. [DOI: 10.1016/j.pdj.2022.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Vu H, Vo PTD, Kim HD. Gender modified association of oral health indicators with oral health-related quality of life among Korean elders. BMC Oral Health 2022; 22:168. [PMID: 35524199 PMCID: PMC9078006 DOI: 10.1186/s12903-022-02104-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 02/28/2022] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To evaluate the association between oral health-related quality of life (OHRQoL) and oral health indicators including dental status, total occlusion force (TOF), number of natural and rehabilitated teeth (NRT), number of natural teeth (NT), and to explore the effect modification on the association by gender among Korean elders. METHODS A total of 675 participants aged 65 or above recruited by a cluster-based stratified random sampling were included in this cross-sectional study. The 14-items Korean version of the Oral Health Impact Profile (OHIP) was used to measure OHRQoL. The responses about OHIP were dichotomized by the cut-off point of 'fairly often' to determine the 'poor' versus 'fair' OHRQoL. Age, gender, education level, alcohol drinking, smoking, metabolic syndrome, frailty, and periodontitis were considered as confounders. Multiple multivariable logistic regression analyses were applied to assess the adjusted association between oral health indicators and OHRQoL. Gender stratified analysis was also applied to explore the effect modification of the association. RESULTS The prevalence of poor OHRQoL was 43.0%, which was higher in women, less-educated elders, alcohol non-drinkers and frailty elders (p < 0.05). Elders with poor OHRQoL also showed lower values of oral health indicators than elders with fair OHRQoL (p < 0.05). Those with NRT ≤ 24, NT ≤ 14, and TOF < 330 N increased the risk of poor OHRQoL by 2.3 times (OR = 2.26, confidence interval [CI] 1.54-3.31), 1.5 times (OR = 1.45, CI 1.02-2.07), and 1.5 times (OR = 1.47, CI 1.06-2.04), respectively. In women, the association of NRT ≤ 24 with poor OHRQoL increased from OR of 2.3 to OR of 2.4, while, in men, the association of TOF < 330 N with poor OHRQoL increased from OR of 1.5 to OR of 3.2. CONCLUSION Oral health indicators consisting of TOF, NRT, and NT were independently associated with poor OHRQoL among Korean elders. Gender modified the association of TOF and NRT. Preventive and/or curative management for keeping natural teeth and the rehabilitation of missing teeth to recover the occlusal force may be essential for reducing poor OHRQoL.
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Affiliation(s)
- Huong Vu
- Department of Preventive and Social Dentistry, School of Dentistry, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea
| | - Phuc Thi-Duy Vo
- Department of Immunology and Molecular Microbiology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Hyun-Duck Kim
- Department of Preventive and Social Dentistry, School of Dentistry, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea. .,Dental Research Institute, Seoul National University, Seoul, Republic of Korea.
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40
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Bettiol NB, Regalo SCH, Cecilio FA, Gonçalves LMN, de Vasconcelos PB, Lopes CGG, Andrade LM, Regalo IH, Siéssere S, Palinkas M. Intervertebral Disc Degeneration: Functional Analysis of Bite Force and Masseter and Temporal Muscles Thickness. Prague Med Rep 2022; 123:101-112. [PMID: 35507943 DOI: 10.14712/23362936.2022.11] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
Intervertebral disc degeneration is a pathological condition associated with the intervertebral disc and is related to functional alterations in the human body. This study aimed to evaluate the maximum molar bite force and masseter and temporal muscles thickness in individuals with intervertebral disc degeneration. Thirty-two individuals were divided into two groups: those with degeneration of intervertebral discs (n=16) and those without degeneration (n=16). The maximum molar bite force (on the right and left sides) was measured using a dynamometer. Masseter and temporal muscle thickness during mandibular task rest and dental clenching in maximum voluntary contraction were analysed using ultrasound. Significant differences in the left molar bite force (p=0.04) were observed between the groups (Student's t-test, p<0.05). The intervertebral disc degeneration group had a lower maximum molar bite force. No significant differences in muscle thickness were observed between the masseter and temporal muscles in either group. However, based on clinical observations, the group with intervertebral disc degeneration presented less masseter muscle thickness and greater temporal muscle thickness in both mandibular tasks. Degenerative disease of the intervertebral discs promoted morphofunctional changes in the stomatognathic system, especially in maximum molar bite force and masticatory muscle thickness. This study provides insight into the interaction between spinal pathology and the stomatognathic system, which is important for healthcare professionals who treat patients with functional degeneration.
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Affiliation(s)
- Nicole Barbosa Bettiol
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo; National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
| | - Flávia Argentato Cecilio
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | | | - Paulo Batista de Vasconcelos
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Claire Genoveze Gauch Lopes
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Lilian Mendes Andrade
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Isabela Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Selma Siéssere
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo; National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil. .,Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo; National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil.
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41
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Ibañez FC, Merino G, Marín-Arroyo MR, Beriain MJ. Instrumental and sensory techniques to characterize the texture of foods suitable for dysphagic people: A systematic review. Compr Rev Food Sci Food Saf 2022; 21:2738-2771. [PMID: 35481665 DOI: 10.1111/1541-4337.12957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 03/14/2022] [Accepted: 03/18/2022] [Indexed: 11/29/2022]
Abstract
The interest to characterize texture-modified foods (TMFs) intended for people with oropharyngeal dysphagia (OD) has grown significantly since 2011. Several instrumental and sensory techniques have been applied in the analysis of these foods. The objective of the present systematic review was to identify the most appropriate techniques, especially for the food industry and clinical setting. The search was carried out in three online databases according to the "Preferred Reporting Items for Systematic Reviews and Meta-Analyses" (PRISMA). Across the multiple trials reviewed, Texture Profile Analysis and the Uniaxial Compression Test were most used as the instrumental technique for solid foods, and the Back Extrusion Test for fluid and semisolid foods. All trials used descriptive analysis as the sensory technique. However, the experimental conditions of the trials lacked standardization. Consequently, the results of the trials were not comparable. To properly characterize the texture of TMFs intended for OD by each technique, an international consensus is needed to establish standardized experimental conditions. Methods based on these techniques should also be validated by collaborative studies to verify repeatability, replicability, and reproducibility.
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Affiliation(s)
- Francisco C Ibañez
- Institute for Sustainability and Food Chain Innovation, Universidad Pública de Navarra, Pamplona, Spain
| | - Gorka Merino
- Institute for Sustainability and Food Chain Innovation, Universidad Pública de Navarra, Pamplona, Spain
| | | | - María José Beriain
- Institute for Sustainability and Food Chain Innovation, Universidad Pública de Navarra, Pamplona, Spain
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Gałczyńska-Rusin M, Pobudek-Radzikowska M, Gawriołek K, Czajka-Jakubowska A. Gender-Related Biomechanical Properties of Masseter Muscle among Patients with Self-Assessment of Bruxism: A Comparative Study. J Clin Med 2022; 11:845. [PMID: 35160297 PMCID: PMC8836861 DOI: 10.3390/jcm11030845] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 01/30/2022] [Accepted: 02/02/2022] [Indexed: 02/06/2023] Open
Abstract
It seems extremely important to know the biomechanical properties of the orofacial tissues among patients with increased activity of masticatory muscles, such as bruxism. The aim of this study was to evaluate biomechanical properties of the masseter muscle by using MyotonPRO in adults with probable bruxism and to define gender relations. This study was conducted in the Temporomandibular Disorders Department at Poznan University of Medical Sciences, Poland (June 2021-November 2021) among patients that reported bruxism symptoms The patients underwent a clinical examination, then the biomechanical properties of the masseter muscles were assessed. The MyotonPro measured masseter tone, stiffness and elasticity in 36 patients with a self-assessment of bruxism (18 women and 18 men). Data were collected from relaxed and contracted muscles. In relaxed masseter muscles there were no statistically significant differences between the sexes in muscle tone, stiffness and elasticity. During contraction significant differences were found between the sexes in the tension and the stiffness of the masseter muscles. Moreover, women often experienced headaches in the temporal region and pain in the masseter muscles during palpation. Among patients with a self-assessment of bruxism, accompanying pain was significantly more frequent in women. Male gender was associated with increased muscle tension and stiffness of the contracted masseter muscle.
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Affiliation(s)
- Małgorzata Gałczyńska-Rusin
- Department of Orthodontics and Temporomandibular Disorders, University of Medical Sciences, 60-812 Poznań, Poland; (M.P.-R.); (K.G.); (A.C.-J.)
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Lima VP, Machado JB, Zhang Y, Loomans BAC, Moraes RR. Laboratory methods to simulate the mechanical degradation of resin composite restorations. Dent Mater 2022; 38:214-229. [PMID: 34949477 PMCID: PMC9903973 DOI: 10.1016/j.dental.2021.12.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 01/21/2023]
Abstract
OBJECTIVES This study reviewed the literature to identify in vitro approaches that have been used to simulate the mechanical degradation and fatigue of resin composite restorations. METHODS A search for articles was carried out in 4 databases and included studies in which composite restorations were bonded to teeth and subject to cyclic loading. Articles were assessed for eligibility, and the following items were the extracted from the included studies: authors, country, year, materials tested, simulation device and details including load magnitude and frequency, number of cycles, type of antagonist, test medium, and temperature. Data were analyzed descriptively. RESULTS The 49 studies included showed a high level of heterogeneity in methods, devices, and test parameters. Nineteen different simulation devices were used, applying loads varying between 30 and 2900 N, and frequencies varying between 0.4 and 12 Hz. The load and frequency used most often were ~ 50 N (63.3%) and 1.5-1.7 Hz (32.7%). The number of cycles varied between 10 K and 2.4 M, 1.2 M was the most prevalent (40.8%). The majority of studies combined cyclic loading with at least one additional aging method: static liquid storage, thermo-mechanical cycling applied simultaneously, and thermal cycling as a discrete aging step were the three most frequent methods. The overall evidence indicated reporting problems, and suggested a lack of clinical validation of the research methods used. SIGNIFICANCE Validation studies, underlying clinical supporting data, and better reporting practices are needed for further improving research on the topic. Specific suggestions for future studies are provided.
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Affiliation(s)
- Veronica P Lima
- Universidade Federal de Pelotas, Pelotas, RS, Brazil; Radboud University Medical Center, Radboud Institute for Health Sciences, Department of Dentistry, Nijmegen, The Netherlands
| | | | - Yu Zhang
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, USA
| | - Bas A C Loomans
- Radboud University Medical Center, Radboud Institute for Health Sciences, Department of Dentistry, Nijmegen, The Netherlands
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Changes in incisor relationship over the life course - Findings from a cohort study. J Dent 2021; 117:103919. [PMID: 34896441 DOI: 10.1016/j.jdent.2021.103919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 11/23/2021] [Accepted: 12/07/2021] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE The aim of this longitudinal cohort study was to investigate the changes in incisor relationship over three decades from adolescence to mid-adulthood. MATERIALS AND METHODS The sample included 1,037 children (48.4% female) born between April 1972 and March 1973 from the longitudinal birth cohort Dunedin Multidisciplinary Health and Development Study. Overjet and overbite values were assessed at age 15 and 45 years and entered in a regression model as outcome variables. Baseline occlusal variables, sex, history of orthodontic treatment, periodontal data recorded at age 38, and self-reported oral parafunction and orthodontic treatment history recorded at age 45 were entered as covariates in the regression analysis. RESULTS Regression modelling showed that overjet/overbite category (high or low) at age 15 tends to predict overjet/overbite category at age 45, with overjet become slightly larger (around +0.5mm) and overbite slightly lower (-0.5mm) over time. Study members with self-reported tooth clenching had a slighter greater overbite (+0.3mm) at age 45 than those who did not. Additionally, those with signs of periodontal disease at age 38 had a slightly larger overjet (+0.5mm) at age 45 than those without disease. Sex differences were demonstrated with females having 0.6 mm larger overjet, and 0.4 mm overbite at age 45. CONCLUSIONS Overall, overjet values tend to be higher during mid-adulthood than during adolescence, while the converse is true for overbite. There appears to be a degree of sexual dimorphism in overjet and overbite values later in life. CLINICAL SIGNIFICANCE Incisor relationships change during the life course and are related to ageing, sex, periodontal health, and parafunctional habits. Clinicians and educators should be aware of these changes when making treatment decisions that alter incisor relationship.
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Shiga H, Nakajima K, Uesugi H, Komino M, Sano M, Arai S. Reference value of masticatory performance by measuring the amount of glucose extraction from chewing gummy jelly. J Prosthodont Res 2021; 66:618-622. [PMID: 34880167 DOI: 10.2186/jpr.jpr_d_21_00154] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE The purpose of this study was to determine a reference value for masticatory performance (MP) by measuring the amount of glucose extracted(AGE) from chewing gummy jelly. METHODS A total of 237 young adults (young group, 20-39 years), 147 middle-aged adults (middle-aged group, 40-59 years), and 177 older adults (old group, 60-87 years) participated in this study. All participants had natural dentition, excluding the third molars. AGE was measured when the participant chewed gummy jelly and used as a parameter of MP. AGE was compared among the three groups. Next, AGE in each group was compared between the habitual chewing side and non-habitual chewing side, and between males and females. The correlation between age and AGE was also investigated. RESULTS AGE in the young, middle, and old groups were similar, and no significant differences were observed. AGE was significantly higher in the habitual chewing side compared to the non-habitual chewing side, and in males than that in females. No significant correlations were found between age and AGE. AGE in the habitual chewing side of all ages was 221.9 ± 34.4 mg/dL for males and 206.0 ± 28.7 mg/dL for females. The mean-2SD (standard deviation) value representing the reference value of healthy adults was 153.1 mg/dL for males and 148.6 mg/dL for females, which was close to 150 mg/dL. CONCLUSION It was concluded that the reference value of masticatory performance as measured by the amount of glucose extraction after chewing gummy jelly was 150 mg/dL.
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Affiliation(s)
- Hiroshi Shiga
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Kunihisa Nakajima
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Hanako Uesugi
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Marie Komino
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Mako Sano
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Shuhei Arai
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
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Gomes GGC, Palinkas M, da Silva GP, Gonçalves CR, Lopes RFT, Verri ED, Fabrin SCV, Fioco EM, Siéssere S, Regalo SCH. Bite Force, Thickness, and Thermographic Patterns of Masticatory Muscles Post-Hemorrhagic Stroke. J Stroke Cerebrovasc Dis 2021; 31:106173. [PMID: 34700235 DOI: 10.1016/j.jstrokecerebrovasdis.2021.106173] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/16/2021] [Accepted: 10/10/2021] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE Stroke is a neurological deficit of cerebrovascular origin, considered a 21st-century epidemic that causes functional changes in the human body. This study aimed to evaluate the stomatognathic system of patients after hemorrhagic stroke through the bite force, thickness, and skin temperature in the region of the masseter and temporalis muscles. MATERIAL AND METHODS Twenty-four subjects were divided into groups: post-hemorrhagic stroke; with right side of the affected body (n = 12) and without the neurological disorder (n = 12). Maximum molar bite force was verified using a digital dynamometer. Muscle thickness was measured using ultrasound images obtained at rest and during maximal voluntary contraction of the masseter and temporalis muscles. Thermographic camera was used to record the thermographic patterns of the masseter and temporalis muscles. Data were subjected to Student's t-test (P < .05). RESULTS The maximum molar bite force showed significant differences in the right (P = .04) and left (P = .03) sides, with a reduction in force in the post-hemorrhagic stroke group on the affected and unaffected sides. There was a significant difference (P < .05) in the thickness of the left temporal muscle at mandibular rest (P = .01) between groups. The post-hemorrhagic stroke group clinically presented greater muscle thickness in almost 100% of the muscles evaluated in both clinical conditions. There were no significant differences in skin temperature in the masseter and temporal muscles between the groups. CONCLUSIONS Our results suggest functional changes in the stomatognathic system of subjects after a hemorrhagic stroke, especially concerning molar bite force and masticatory muscle thickness in the temporal muscle (unaffected side).
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Affiliation(s)
- Guilherme Gallo Costa Gomes
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, National Institute and Technology - Translational Medicine (INCT.TM), School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n, Bairro, São Paulo, SP 14040-904, Brazil.
| | - Gabriel Pádua da Silva
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Camila Roza Gonçalves
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Robson Felipe Tosta Lopes
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Edson Donizetti Verri
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Saulo Cesar Vallin Fabrin
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Evandro Marianetti Fioco
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, SP, Brazil.
| | - Selma Siéssere
- Department of Basic and Oral Biology, National Institute and Technology - Translational Medicine (INCT.TM), School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n, Bairro, São Paulo, SP 14040-904, Brazil.
| | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, National Institute and Technology - Translational Medicine (INCT.TM), School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n, Bairro, São Paulo, SP 14040-904, Brazil.
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Lellis JBM, Borges TDF, de Oliveira RH, Palinkas M, Hallak JEC, Siéssere S, Regalo SCH. Does Systemic Arterial Hypertension Change the Function of the Stomatognathic System? Prague Med Rep 2021; 122:201-211. [PMID: 34606432 DOI: 10.14712/23362936.2021.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
The aim of this study was to evaluate the stomatognathic system of individuals with controlled systemic hypertension through comparison with a disease-free control group. Seventy individuals (44 female and 26 male) were divided into two groups: a controlled systemic hypertension (n=35) and a disease-free control (n=35). The individuals were evaluated on the basis of masticatory cycle efficiency of the value of the ensemble-averaged integrated linear envelope to the electromyographic signal of the masseter and temporalis muscles in the habitual (peanuts and raisins) and non-habitual chewing (Parafilm M); molar bite force (right and left) and ultrasound images from the bilateral masseter and temporal muscles at rest and maximum voluntary contraction. The data obtained were tabulated and submitted to statistical analysis (p<0.05). There was a significant difference between groups in the habitual (peanuts and raisins) and non-habitual (Parafilm M) chewing with reduced muscle activity to controlled systemic hypertension group. Muscle thickness occurred significant difference between groups at rest and maximum voluntary contraction of the temporalis muscles. There was no significant difference between groups in maximum molar bite force. The present study findings indicate that the controlled systemic hypertension promotes functional changes of the masticatory system, especially with respect to its masticatory efficiency and muscle thickness.
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Affiliation(s)
- João Batista Mattos Lellis
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Tânia de Freitas Borges
- Department of Dental Prosthesis, Technical School of Health, Federal University of Uberlândia, Uberlândia, Brazil
| | - Richard Honorato de Oliveira
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Marcelo Palinkas
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil. .,National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil.
| | - Jaime Eduardo Cecilio Hallak
- Department of Neuroscience and Behavioral Sciences, Faculty of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
| | - Selma Siéssere
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
| | - Simone Cecilio Hallak Regalo
- Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.,National Institute and Technology - Translational Medicine (INCT.TM), São Paulo, Brazil
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Comparison of two different digital occlusal analysis methods. Clin Oral Investig 2021; 26:2095-2109. [PMID: 34596770 DOI: 10.1007/s00784-021-04191-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/20/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVES The aim of this study is to compare the sensitivity of T-Scan digital occlusal analysis system and the occlusal analysis mode of the CEREC Omnicam system, which is mainly used for design/production, using the data recorded at the maximum intercuspal position. MATERIALS AND METHODS Occlusal recordings were obtained from healthy 20 females and 20 males aged 18-25 at the maximum intercuspal position. Records were saved as.jpeg format and transferred to Adobe Photoshop CS6 program. Blue, green, and red colors (shown by the same color codes in both systems) representing light, intense, and tight contacts, respectively, were evaluated in terms of the pixel counts. For statistical comparison, the differences between the systems independent sample T test and, between the genders, one sample T test were used (α = 0.05). RESULTS The total numbers of pixels of all colors which are evaluated with T-Scan and CEREC Omnicam in females were 31,296.6 and 15,745, respectively, and in males 39,812.3 and 17,462, respectively. In both systems, the blue contact area is the most seen. For all colors tested, T-Scan recorded more contact than those of CEREC Omnicam in both genders and statistically significant difference was found between two systems for all colors. In both systems, recorded contacts are significantly higher in men than in women. Compared with women, 27% more contact area was recorded in men with T-Scan and 11% more with CEREC Omnicam was obtained. CONCLUSIONS While T-Scan was found sensitive even in the diagnosis of light contacts, the CEREC Omnicam was found sensitive only in the diagnosis of tight contacts. CLINICAL RELEVANCE Although both T-Scan and CEREC Omnicam are effective in occlusal analysis, T-Scan's sensitivity was found to be higher. TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT04798729.
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Wattanapan P, Saengnil T, Niamnuy C, Paphangkorakit J, Devahastin S. Textural properties and muscle activities during mastication of normal and ultrasonically softened sticky rice aimed for consumers with swallowing disorder: A pilot study. J Texture Stud 2021; 52:561-566. [PMID: 34536023 DOI: 10.1111/jtxs.12631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 08/12/2021] [Accepted: 09/12/2021] [Indexed: 12/22/2022]
Abstract
Ultrasonication was used to develop softer sticky rice for elder adults. Textural properties of original sticky rice (oSR) and ultrasonically modified sticky rice (mSR) were determined. In addition, jaw muscle activities during mastication of both oSR and mSR were investigated. Twenty-seven healthy elderly subjects, age 68.9 ± 7.6 years, were asked to masticate both types of sticky rice in random sequence for three times with a 5-min rest between each test. Activities of bilateral masseter and suprahyoid muscles were recorded. Root mean square (RMS) and mastication duration were analyzed. After mastication trials, subjects were asked to rate preference and softness of the samples. mSR exhibited significantly lower hardness than oSR, while cohesiveness and adhesiveness values of the two samples were not significantly different. Interestingly, all the muscle activities were not significantly different between masticating oSR and mSR, whereas the number of chewing cycles while chewing the mSR was larger. However, 92% of the subjects preferred mSR and felt that it was softer. mSR may therefore be regarded as having potential for elder people who have difficulty masticating hard solid foods based on its lower hardness and higher level of preference compared to oSR.
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Affiliation(s)
- Pattra Wattanapan
- Faculty of Medicine, Department of Rehabilitation Medicine, Khon Kaen University, Khon Kaen, Thailand.,Dysphagia Research Group, Khon Kaen University, Khon Kaen, Thailand
| | - Thanathat Saengnil
- Faculty of Medicine, Department of Rehabilitation Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Chalida Niamnuy
- Faculty of Engineering, Department of Chemical Engineering, Kasetsart University, Bangkok, Thailand
| | - Jarin Paphangkorakit
- Faculty of Dentistry, Department of Oral Biology, Khon Kaen University, Khon Kaen, Thailand
| | - Sakamon Devahastin
- Faculty of Engineering, Department of Food Engineering, Advanced Food Processing Research Laboratory, King Mongkut's University of Technology Thonburi, Bangkok, Thailand.,The Academy of Science, The Royal Society of Thailand, Bangkok, Thailand
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Yi Y, Heo SJ, Koak JY, Kim SK. Mechanical complications of implant-supported restorations with internal conical connection implants: A 14-year retrospective study. J Prosthet Dent 2021; 129:732-740. [PMID: 34481672 DOI: 10.1016/j.prosdent.2021.06.053] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 06/29/2021] [Accepted: 06/29/2021] [Indexed: 10/20/2022]
Abstract
STATEMENT OF PROBLEM Internal conical connections have become the primary choice for implant-supported restorations. However, studies that identified the risk indicators for mechanical complications and diagnosed the prognosis of the implant-supported restorations are lacking. PURPOSE The purpose of this retrospective clinical study was to evaluate the incidence and consequences of mechanical complications in components of internal conical connection implants and to analyze the risk indicators. MATERIAL AND METHODS A total of 428 patients with 898 internal conical connection implants were included in the study, and mechanical complications over the 14-year observation period were evaluated. The Cox proportional hazard regression model was used to analyze significant effects on mechanical complications, which were presented as hazard ratio and 95% confidence interval. RESULTS Mechanical complications occurred in 430 (47.9%) implants and 248 (57.9%) patients: screw loosening (46.4% of implants, 56.8% of patients); screw fracture (2.6% of implants, 4.4% of patients); abutment fracture (11.4% of implants, 21.3% of patients); and implant fracture (3.5% of implants, 5.4% of patients). Implant restorations replacing molars showed the highest risk for mechanical complication (hazard ratio 12.82; 95% confidence interval 2.73-60.31) and for fracture of all components. Men had a higher risk of mechanical complication than women (hazard ratio 2.00; 95% confidence interval 1.55-2.59), and the risk of fracture was higher in all components. With increased splinted implants, the risk of mechanical complication (hazard ratio 0.67; 95% confidence interval 0.49-0.93) and component fracture (hazard ratio 0.73; 95% confidence interval 0.29-0.89) decreased. Gold screws had a lower risk of screw loosening (hazard ratio 0.74; 95% confidence interval 0.58-0.94) than titanium screws, but a higher risk of fracture (hazard ratio 3.45; 95% confidence interval 1.42-8.36). The smaller the implant diameter, the higher the risk of implant fracture (hazard ratio 0.01; 95% confidence interval 0.00-0.05). CONCLUSIONS Abutments were most frequently fractured among the components of internal conical connection type implants. Molar implant-supported restorations and male patients had higher risks of mechanical complications, and as the number of splinted implants in a prosthesis increased, the risk decreased. Gold screws showed less risk of screw loosening and higher risk of fracture than titanium screws. Narrow-diameter implants had a higher risk of fracture.
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Affiliation(s)
- Yuseung Yi
- Clinical Professor, Department of Prosthodontics, Seoul National University Dental Hospital, Seoul, Republic of Korea
| | - Seong-Joo Heo
- Professor, Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jai-Young Koak
- Professor, Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Seong-Kyun Kim
- Professor, Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
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