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Li K, Tan K, Yacovelli A, Bi WG. Effect of botulinum toxin type A on muscular temporomandibular disorder: A systematic review and meta-analysis of randomized controlled trials. J Oral Rehabil 2024; 51:886-897. [PMID: 38151884 DOI: 10.1111/joor.13648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 11/28/2023] [Accepted: 12/11/2023] [Indexed: 12/29/2023]
Abstract
BACKGROUND Botulinum toxin type A (BTX-A) is increasingly used to manage painful temporomandibular disorders (TMD). However, the effect of BTX-A on muscular TMD remains unclear. OBJECTIVE To assess the efficacy, safety and optimal dose of BTX-A for treating TMD. METHODS We conducted systematic literature searches in MEDLINE, Embase, Web of Science, ClinicalTrials.gov and Cochrane Library until March 2023. We extracted data from randomized controlled trials (RCTs) that evaluated the efficacy and safety of BTX-A in treating muscular TMD. We performed a meta-analysis using a random-effects model. RESULTS Fifteen RCTs involving 504 participants met the inclusion criteria. BTX-A was significantly more effective than placebo in reducing pain intensity, as measured on a 0-10 scale, at 1 month (MD [95% CI] = -1.92 [-2.87, -0.98], p < .0001) and 6 months (MD [95% CI] -2.08, [-3.19 to -0.98]; p = .0002). A higher dosage of BTX-A (60-100 U bilaterally) was associated with a greater reduction in pain at 6 months (MD [95% CI] = -2.98 [-3.52, -2.44]; p < .001). BTX-A also resulted in decreased masseter muscle intensity (μV) (MD [95% CI] = -44.43 [-71.33, -17.53]; p = .001) at 1 month and occlusal force (kg) at 3 months (MD [95% CI] = -30.29 [-48.22 to -12.37]; p = .0009). There was no significant difference in adverse events between BTX-A and placebo. CONCLUSIONS BTX-A is a safe and effective treatment for reducing pain and improving temporomandibular muscle and joint function in muscular TMD patients. A bilateral dose of 60-100 U might be an optimal choice for treating muscular TMD pain.
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Affiliation(s)
- Kaiyang Li
- Department of Medicine, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Kenneth Tan
- Department of Medicine, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Alexandra Yacovelli
- Department of Medicine, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Wei Guang Bi
- Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
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Ferreira GF, Carletti TM, Gama LT, Magno MB, Maia LC, Rodrigues Garcia RCM. Influence of occlusal appliances on the masticatory muscle function in individuals with sleep bruxism: A systematic review and meta-analysis. Eur J Oral Sci 2024; 132:e12979. [PMID: 38421263 DOI: 10.1111/eos.12979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 01/20/2024] [Indexed: 03/02/2024]
Abstract
This systematic review answers the question: "Does occlusal appliance use influence masticatory muscle function of dentate individuals with sleep bruxism?". The literature search included six databases, grey literature, and manual search for articles. Randomized and non-randomized clinical trials were included comparing muscle function of sleep bruxers before and after receiving occlusal appliances. Risk of bias was assessed with risk of bias assessment for randomized and non-randomized clinical trials tool. Twelve studies, three represent randomized clinical trials, were included. Risk of bias was considered low, moderate, or serious. Meta-analyses indicated that soft and hard appliances did not influence muscle activity and bite force of bruxers. Qualitative analysis showed that occlusal appliance use did not influence masticatory performance and muscle volume. However, it was effective in reducing tongue force. Certainty of evidence was considered very low for muscle activity when evaluated with hard appliances, and for bite force evaluated with both appliance materials. Low certainty of evidence was observed for muscle activity with soft appliances. Based on the findings of this meta-analysis, occlusal appliances do not affect masticatory muscle function of sleep bruxers. Regardless of appliance material, the activity of masseter and temporal, and bite force of sleep bruxers was not influenced.
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Affiliation(s)
- Guilherme Fantini Ferreira
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, São Paulo, Brazil
| | - Talita Malini Carletti
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, São Paulo, Brazil
| | - Lorena Tavares Gama
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, São Paulo, Brazil
| | - Marcela Baraúna Magno
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lucianne Cople Maia
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Klukowska M, Grender J, Gossweiler A. A randomized controlled trial assessing denture adhesive efficacy on denture retention across 13 hours. J Prosthodont 2024; 33:324-329. [PMID: 37805705 DOI: 10.1111/jopr.13781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 09/29/2023] [Accepted: 10/05/2023] [Indexed: 10/09/2023] Open
Abstract
PURPOSE To compare the effects of two denture adhesive formulations on the bite force required to dislodge a maxillary denture in adult participants during a 13-h test period. MATERIALS AND METHODS Twenty-two participants with a fair-to-poor fitting maxillary denture opposed by natural dentition or a stable mandibular denture were enrolled in this single-center, randomized, double-blind, two-treatment, 4-period crossover study. Participants were randomly assigned a product usage sequence so that each participant used each product twice during the 4-day test period. The test product was a denture cream adhesive formulated with an optimized calcium/zinc partial salt of polyvinyl methyl ether/maleic acid (Fixodent Ultra technology); the control product was a cream adhesive formulated with a calcium/zinc partial salt of polyvinyl methyl ether/maleic acid (Fixodent Original technology). On each study day, bite force at dislodgement was measured with a gnathodynamometer at baseline, representing the "no adhesive" score. Then, after standardized product application to the participant's existing maxillary denture by site staff, bite force measurements were retaken at 1, 3, 5, 7, 9, 11, and 13 h. The change from baseline and the 13-h area under the bite-force-change-from-baseline curve were analyzed via an analysis of variance. RESULTS Twenty-one participants completed all test periods; one additional participant completed three test periods so 22 participants were included in the analysis. There were 15 females and 7 males with a mean age of 70 years. The mean 13-h area under the bite-force-change-from-baseline curve was 8% greater (p = 0.010) for the test adhesive (114.3 lb) than for the control adhesive (105.9 lb). Both adhesives showed a statistically significant increase in bite force (p < 0.001) at each time point compared to no adhesive. CONCLUSIONS The optimized calcium/zinc partial salt of polyvinyl methyl ether/maleic acid test adhesive provided superior maxillary denture retention relative to that of the control adhesive across 13 h. Both adhesives increased bite force at dislodgement compared to no adhesive.
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Affiliation(s)
| | | | - Ana Gossweiler
- Oral Health Research Institute, Indiana University School of Dentistry, Indianapolis, Indiana, USA
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Parvan M, Khaghaninejad MS, Karimi MT. The comparison between various methods of mandibular reconstruction based on finite element analysis. Proc Inst Mech Eng H 2024; 238:423-429. [PMID: 38415325 DOI: 10.1177/09544119241232282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The Mandible can be damaged by pathological factors, tumors, trauma, infection, and needs a surgical operation for reconstruction and restoring function. There are different methods for the reconstruction of mandible. Based on the surgical approach, primary reconstruction of mandible by reconstruction plate after resection is necessary for maintaining mandibular symmetric and esthetic of the lower third of the face. A finite element model of mandible and masticatory muscles was produced from a normal person (male with 35-year-old). The normal model was resected from the left sixth tooth to the second tooth. The pathological model was reconstructed in different conditions by macro plate. Different conditions were analyzed and compared based on bite force on right fifth tooth, stress developed on screws and macro plate. The finite element analysis results showed that maximum bite force and lower stress on screws were seen in the pathological model (condition 5) when one macro plate and six screws were inserted in the mid-body. The findings showed that the use of two macro plates causes lower stress on it than when we use one. Use of one macro plate and six screws is the best choice in mandibular immobilization which decrease the stress applied on bone and increase the bite force. Because of less stress developed on macro plates and screws, use of two macro plates or one macro plate in mid-body area are also preferred.
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Affiliation(s)
- Mehdi Parvan
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Saleh Khaghaninejad
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Taghi Karimi
- Rehabilitation Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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Herrel A, Locatelli Y, Ortiz K, Theil JC, Cornette R, Cucchi T. Cranial muscle architecture in wild boar: Does captivity drive ontogenetic trajectories? J Morphol 2024; 285:e21676. [PMID: 38361257 DOI: 10.1002/jmor.21676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/02/2024] [Accepted: 01/05/2024] [Indexed: 02/17/2024]
Abstract
The jaw system in mammals is complex and different muscle morphotypes have been documented. Pigs are an interesting group of animals as they are omnivorous and have a bunodont crushing dentition. Moreover, they have interacted with humans for over 10,000 years and grow nearly two orders of magnitude in size. Despite being a model system for studies on cranial form and function, data on the growth of the jaw adductor muscles are scant. Moreover, whether captivity impacts the growth and architecture of the jaw adductors remains unknown. Based on dissection data of the jaw adductors of 45 animals ranging from less than 1 kg to almost 100 kg, we show that muscle masses, muscle fiber lengths, and cross-sectional areas scale as predicted for geometrically similar systems or with slight negative allometry. Only the fiber length of the lateral pterygoid muscle grew with slight positive allometry. Animals raised in captivity in stalls or in an enclosure were overall very similar to wild animals. However, some muscles were larger in captive animals. Interestingly, variation in bite force in captive animals was well predicted by the variation in the size of the superficial masseter muscle relative to the overall jaw adductor mass.
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Affiliation(s)
- Anthony Herrel
- Mécanismes Adaptatifs et Evolution, UMR 7179, Muséum national d'Histoire naturelle CNRS, Paris, France
- Department of Biology, Evolutionary Morphology of Vertebrates, Ghent University, Ghent, Belgium
- Department of Biology, University of Antwerp, Wilrijk, Belgium
- Naturhistorisches Museum Bern, Bern, Switzerland
| | - Yann Locatelli
- Réserve Zoologique de la Haute Touche, Obterre, Muséum national d'Histoire naturelle, Paris, France
| | - Katia Ortiz
- Réserve Zoologique de la Haute Touche, Obterre, Muséum national d'Histoire naturelle, Paris, France
| | - Jean-Christophe Theil
- Mécanismes Adaptatifs et Evolution, UMR 7179, Muséum national d'Histoire naturelle CNRS, Paris, France
- Ecole Nationale Vétérinaire Alfort, Maisons-Alfort, France
| | - Raphaël Cornette
- Institut de Systématique Evolution Biodiversité (ISYEB), CNRS, Muséum National D'Histoire Naturelle, Sorbonne Université, Paris, France
| | - Thomas Cucchi
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements, UMR 7209, Muséum national d'Histoire naturelle CNRS, Paris, France
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Stanchak KE, Faure PA, Santana SE. Ontogeny of cranial musculoskeletal anatomy and its relationship to allometric increase in bite force in an insectivorous bat (Eptesicus fuscus). Anat Rec (Hoboken) 2023; 306:2842-2852. [PMID: 37005737 DOI: 10.1002/ar.25213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 04/04/2023]
Abstract
Bite force is a performance metric commonly used to link cranial morphology with dietary ecology, as the strength of forces produced by the feeding apparatus largely constrains the foods an individual can consume. At a macroevolutionary scale, there is evidence that evolutionary changes in the anatomical elements involved in producing bite force have contributed to dietary diversification in mammals. Much less is known about how these elements change over postnatal ontogeny. Mammalian diets drastically shift over ontogeny-from drinking mother's milk to feeding on adult foods-presumably with equally drastic changes in the morphology of the feeding apparatus and bite performance. Here, we investigate ontogenetic morphological changes in the insectivorous big brown bat (Eptesicus fuscus), which has an extreme, positive allometric increase in bite force during development. Using contrast-enhanced micro-computed tomography scans of a developmental series from birth to adult morphology, we quantified skull shape and measured skeletal and muscular parameters directly related to bite force production. We found pronounced changes in the skull over ontogeny, including a large increase in the volume of the temporalis and masseter muscles, and an expansion of the skull dome and sagittal crest that would serve to increase the temporalis attachment area. These changes indicate that development of the jaw adductors play an important role in the development of biting performance of these bats. Notably, static bite force increases with positive allometry with respect to all anatomical measures examined, suggesting that modifications in biting dynamics and/or improved motor coordination also contribute to increases in biting performance.
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Affiliation(s)
| | - Paul A Faure
- Department of Psychology, Neuroscience & Behaviour, McMaster University, Hamilton, Ontario, Canada
| | - Sharlene E Santana
- Department of Biology, University of Washington, Seattle, USA
- Department of Mammalogy, Burke Museum of Natural History and Culture, Seattle, Western Australia, USA
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de Sonnaville WFC, Speksnijder CM, Zuithoff NPA, Heijstek MW, Wulffraat NM, Steenks MH, Rosenberg AJWP. Clinically Established Temporomandibular Involvement in Adults With Juvenile Idiopathic Arthritis. J Rheumatol 2023; 50:1462-1470. [PMID: 37399466 DOI: 10.3899/jrheum.2023-0204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/12/2023] [Indexed: 07/05/2023]
Abstract
OBJECTIVE To study clinical variables defining temporomandibular function in adults with juvenile idiopathic arthritis (JIA) and healthy controls. METHODS In this cross-sectional study, the temporomandibular joint (TMJ) screening protocol, mandibular range of motion (MROM), and anterior maximum voluntary bite force (AMVBF) were compared between adults with JIA and healthy controls. Unadjusted and adjusted models with corrections for sex and disease duration were constructed for active maximum interincisal mouth opening (AMIO) and AMVBF. RESULTS A total of 100 adults with JIA and 59 healthy adults were included in this study. In adults with JIA, 56% had clinically established TMJ involvement. AMIO was the MROM variable most reduced by TMJ involvement; AMIO was 8.8 mm (95% CI -11.40 to -6.12; P < 0.001) less in adults with JIA with TMJ involvement compared to JIA without TMJ involvement. No differences of AMIO were found between healthy adults and adults with JIA without TMJ involvement (-2.52, 95% CI -5.13 to 0.10; P = 0.06). Male sex was associated with a higher AMIO, and disease duration was associated with a decreased AMIO. Collinearity between the subtype prebiologic era and disease duration was found. AMVBF did not differ between adults with JIA and healthy adults. CONCLUSION The high prevalence of clinically established TMJ involvement in adults with JIA indicates the need for awareness of TMJ problems in adults with JIA. TMJ involvement negatively influenced AMIO and should therefore be part of the TMJ screening in adults with JIA. AMVBF seems to have less utility for TMJ screening in adult populations.
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Affiliation(s)
- Willemijn F C de Sonnaville
- W.F.C. de Sonnaville, MD, C.M. Speksnijder, PT, MSc, PhD, M.H. Steenks, DDS, PhD, A.J.W.P. Rosenberg, DMD, MD, Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, Utrecht University;
| | - Caroline M Speksnijder
- W.F.C. de Sonnaville, MD, C.M. Speksnijder, PT, MSc, PhD, M.H. Steenks, DDS, PhD, A.J.W.P. Rosenberg, DMD, MD, Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, Utrecht University
| | - Nicolaas P A Zuithoff
- N.P.A. Zuithoff, MSc, PhD, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht
| | - Marloes W Heijstek
- M.W. Heijstek, MD, PhD, Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht
| | - Nico M Wulffraat
- N.M. Wulffraat, MD, PhD, Department of Pediatric Rheumatology and Immunology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, and European Reference Network (RITA), Utrecht, the Netherlands
| | - Michel H Steenks
- W.F.C. de Sonnaville, MD, C.M. Speksnijder, PT, MSc, PhD, M.H. Steenks, DDS, PhD, A.J.W.P. Rosenberg, DMD, MD, Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, Utrecht University
| | - Antoine J W P Rosenberg
- W.F.C. de Sonnaville, MD, C.M. Speksnijder, PT, MSc, PhD, M.H. Steenks, DDS, PhD, A.J.W.P. Rosenberg, DMD, MD, Department of Oral and Maxillofacial Surgery and Special Dental Care, University Medical Center Utrecht, Utrecht University
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Fathalla R, Samih H, Abdel Fattah Ramadan A. An In Vivo Study Using T-scan III Occlusal Analysis System: Does the Extraction Pattern Affect the Final Occlusion in Orthodontics? Cureus 2023; 15:e47965. [PMID: 38034277 PMCID: PMC10685985 DOI: 10.7759/cureus.47965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2023] [Indexed: 12/02/2023] Open
Abstract
BACKGROUND The assessment of an orthodontic patient's occlusion throughout the treatment and after debonding permits the orthodontist to improve functional occlusion through interventional tooth movements, thus rendering the overall treatment more efficient in terms of stability and masticatory efficiency. This study aimed to evaluate the effect of four first premolar extractions during orthodontic treatment on the distribution of bite force using the T-scan III system (Tekscan Inc., Boston, MA). OBJECTIVE We aim to evaluate the effect of four first premolar extractions during orthodontic treatment on bite force distribution. METHODS Ten patients (mean age: 16 ± 2.72 years), who would be treated orthodontically with four first premolar extractions to treat their teeth crowding, were selected for this study. The T-scan III system was utilized to measure the occlusal bite force of the patients before and after treatment, and the findings were compared. RESULTS There was a non-statistically significant decrease in the occlusal bite force's mean in the arch's anterior segment from 24.45% (± 8.50%) to 14.25% (± 12.93%) after the orthodontic treatment. A non-statistically significant increase in the occlusal bite force in the posterior right segment of the arch from 37.64% (± 18.13%) to 41.65% (± 11.52%) was found after the treatment. The occlusal bite force in the posterior left segment of the arch increased insignificantly from 30.53% (± 20.00%) to 43.95% (± 13.22%). There was an even distribution of bite force on both sides of the arch by the end of the treatment. CONCLUSIONS Orthodontic treatment helps to achieve a functional occlusal balance by assisting in the uniform distribution of biting force on both sides of the arch. There was no statistically significant change in the distribution of bite force recordings collected before and after orthodontic treatment, indicating that the removal of the four first premolar teeth does not impact the functional aspect of occlusion. The T-scan III system serves as an essential guide during orthodontic treatment to monitor occlusal changes.
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Affiliation(s)
- Rim Fathalla
- Department of Orthodontics, Faculty of Dentistry, Suez Canal University, Ismailia, EGY
| | - Hanady Samih
- Department of Orthodontics, Faculty of Dentistry, Suez Canal University, Ismailia, EGY
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Yoshida K. Guillain-Barré Syndrome Presenting With Masticatory Disturbance and Reduction in Bite Force. Cureus 2023; 15:e47174. [PMID: 38021962 PMCID: PMC10652076 DOI: 10.7759/cureus.47174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2023] [Indexed: 12/01/2023] Open
Abstract
Guillain-Barré syndrome is a rare, rapidly progressive, and potentially fatal immune-mediated neuropathy. A 17-year-old male patient with a fever of 38°C developed masticatory impairment a few days later. Although the fever resolved after one week, the restricted mouth opening and decreased bite force persisted. Thirty-five days after disease onset, the patient was referred to our clinic and reported severe masticatory dysfunction due to a significant reduction in maximum bite force (left: 0 N, right: 12.7 N). His maximal mouth opening was 24 mm without jaw deviation. An electrophysiological study revealed Guillain-Barré syndrome (acute motor axonal neuropathy). The patient was closely monitored as he underwent rehabilitation comprising mouth opening and mastication training. The patient's bite force and masticatory impairment due to the weakness of the muscles of mastication gradually improved. At one year and five months after disease onset, the masticatory impairment had fully resolved. His maximum bite force two years after disease onset was 158.3 N on the left side and 172.2 N on the right side.
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Affiliation(s)
- Kazuya Yoshida
- Department of Oral and Maxillofacial Surgery, National Hospital Organization, Kyoto Medical Center, Kyoto, JPN
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10
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Khan SIR, Aljammaz G, Alosail LA, Almeshrafi A, Ramachandran A, Siddeeqh S, Alfadley A. Psychological Stress as a Determinant of Increased Maximum Voluntary Bite Force - A Clinical Observational Study. Cureus 2023; 15:e46106. [PMID: 37900472 PMCID: PMC10611984 DOI: 10.7759/cureus.46106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2023] [Indexed: 10/31/2023] Open
Abstract
Background Psychological stress is a known risk factor and modulator for several oral diseases. It is among the critical etiological factors of bruxism and several other disorders. The quantum of bite force is one of the prime determinants of wear resistance and the clinical performance of restorations. Thus, the present study aims to investigate the relationship between the maximum voluntary bite force (MVBF) and the amount of perceived stress experienced by an individual. Materials and methods Patients (n=111) fulfilling the exclusion and inclusion criteria were divided into high, medium, and low-stress groups based on their stress scores deduced from the Perceived Stress Scale questionnaire (PSS). Bite force measurement was recorded in Newtons (N) for each subject using a portable customized bite recording FlexiForce sensor (B 201). The data were analyzed using Kruskal-Wallis and independent samples t-test. Results Among the females, the bite force in the medium and high-stress groups was greater compared to the low-stress level group. On the other hand, there was no difference in bite force between any of the stress level groups among male participants. Conclusion The results show that higher MVBF is associated with higher perceived stress scores in adult females. Practical Implications Psychological counseling can be included in the dental treatment plan of individuals with a high-stress score to counteract their stress-related higher occlusal forces, parafunctional jaw movements, and risky oral health behaviors, thereby potentially reducing the incidence of adverse outcomes such as temporomandibular joint dysfunction and restoration failure by careful choice of restorative materials.
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Affiliation(s)
- Sulthan Ibrahim R Khan
- Department of Restorative and Prosthetic Dental Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, SAU
| | - Ghaida Aljammaz
- Endodontics, King Abdulaziz Medical City - National Guard Health Affairs, Riyadh, SAU
| | - Lama A Alosail
- Periodontics, King Abdulaziz Medical City - National Guard Health Affairs, Riaydh, SAU
| | - Azzam Almeshrafi
- Periodontics, King Abdullah International Medical Research Centre, Riyadh, SAU
| | - Anupama Ramachandran
- Conservative Dentistry and Endodontics, Chettinad Dental College and Research Institute, Chennai, IND
| | - Salman Siddeeqh
- Maxillofacial Surgery and Diagnostic Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, SAU
| | - Abdulmohsen Alfadley
- Endodontics, Restorative and Prosthetic Dental Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, SAU
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11
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Srinivasan M, Kamnoedboon P, Angst L, Müller F. Oral function in completely edentulous patients rehabilitated with implant-supported dental prostheses: A systematic review and meta-analysis. Clin Oral Implants Res 2023; 34 Suppl 26:196-239. [PMID: 37750517 DOI: 10.1111/clr.14068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 03/10/2023] [Accepted: 03/30/2023] [Indexed: 09/27/2023]
Abstract
OBJECTIVES This review evaluated the effects of rehabilitation with implant-supported prostheses on the oral function of completely edentulous adults. MATERIALS AND METHODS Systematic literature searches were performed to identify records reporting on oral function in completely edentulous adults rehabilitated with implant-supported prostheses. Meta-analyses were performed on various outcomes including bite force, masticatory performance, muscle activity, mandibular movement/chewing pattern, and salivary flow. RESULTS 5507 records were identified. Thirty studies qualified for data extraction and analysis. The kappa (𝛋) for the search and identification strategy ranged between 0.50 and 1.00. Meta-analysis was performed grouping the studies by outcomes and split by time points of 6-12 months, 12-36 months, and >36 months after implant therapy. The meta-analyses revealed a significant improvement in oral function of completely edentulous adults after rehabilitation with implant-supported prostheses at 6-12 months (Z = -4.895, p < .001; 95% CI: -0.703, -0.301; τ2 = .609; Q = 114.953, df = 17, p < .001; I2 = 85.2%), at 12-36 months (Z = -4.886, p < .001; 95% CI: -0.580, -0.248; τ2 = .908; Q = 280.611, df = 35, p < .001; I2 = 87.5%) and at more than 36 months (Z = -9.108, p < .001; 95% CI: -1.472, -0.951; τ2 = .019; Q = 7.918, df = 7, p = .340; I2 = 11.6%). The included studies demonstrated a low to moderate risk of bias. CONCLUSIONS This systematic review concluded that the oral function of completely edentate adults significantly improved with implant-supported/retained prostheses, even when only one jaw received implant therapy. Therefore, implant therapy should be promoted for edentulous adults to alleviate the shortcomings of conventional complete removable dental prostheses.
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Affiliation(s)
- Murali Srinivasan
- Clinic of General-, Special Care, and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
- Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Porawit Kamnoedboon
- Clinic of General-, Special Care, and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
- Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Lea Angst
- Clinic of General-, Special Care, and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Frauke Müller
- Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
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Velásquez B, Rodríguez M, Mosquera V, Álvarez E, Chauca L, Mena A. Occlusal Analysis in Natural Dentition: Systematic Review. Eur J Dent 2023; 17:615-622. [PMID: 36252609 PMCID: PMC10569841 DOI: 10.1055/s-0042-1755626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
This study aimed to evaluate the effectiveness of conventional occlusal analysis in contrast with digital occlusal analysis in natural dentition. Occlusal analysis allows the identification of normal and abnormal occlusal contact points that alter the craniomandibular cervical system. We searched for articles with keywords [[dental occlusion]], [[natural dentition]], [[occlusal adjustment]], [[Immediate Complete Anterior Guidance Development]] [[mastication]], [[bite force]], [[premature contact]], [[occlusal balance]] [[articulating paper]]], [[spray]], [[Occlusal contacts]], and [[bite strength]]. They were considered observational , odds ratio and case control studies. We found 189 items. After evaluating the abstracts and full texts of the articles, 10 papers met the inclusion criteria. It was found that occlusal analysis allows the identification of the relationship between poor occlusion and the sensitivity of the teeth due to occlusal trauma, which is also related to temporomandibular joint pain in dynamic occlusion. The contacts of greater strength were observed in nonfunctional cusps, 48%, without ruling out the functional cusps, 24%. Despite being the universal method of occlusal control to date, the use of joint paper, remains subjective compared to the digital occlusal control device. Posture is considered directly related to occlusal trauma and temporomandibular disorders; without proper occlusal analysis, a clear diagnosis of the patient's joint condition cannot be obtained. Digital occlusal analysis is more objective than traditional occlusal analysis.
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Affiliation(s)
- Byron Velásquez
- Department of Prosthesis, School of Dentistry, Universidad de Las Americas, Quito, Ecuador
| | - María Rodríguez
- Department of Prosthesis, School of Dentistry, Universidad de Las Americas, Quito, Ecuador
| | - Verónica Mosquera
- Department of Prosthesis, School of Dentistry, Universidad de Las Americas, Quito, Ecuador
| | - Eddy Álvarez
- Department of Prosthesis, School of Dentistry, Universidad de Las Americas, Quito, Ecuador
| | - Luis Chauca
- Department of Periodontics and Implantology Oral Research, College of Dentistry, Universidad de Guayaquil, Guayaquil, Ecuador
| | - Alexandra Mena
- Departamento de Investigación de Prótesis Dental, Facultad de Odontología, Universidad de Las Américas, UDLACP, Quito, Ecuador
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Taverne M, Watson PJ, Dutel H, Boistel R, Lisicic D, Tadic Z, Fabre AC, Fagan MJ, Herrel A. Form-function relationships underlie rapid dietary changes in a lizard. Proc Biol Sci 2023; 290:20230582. [PMID: 37282532 DOI: 10.1098/rspb.2023.0582] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023] Open
Abstract
Macroevolutionary changes such as variation in habitat use or diet are often associated with convergent, adaptive changes in morphology. However, it is still unclear how small-scale morphological variation at the population level can drive shifts in ecology such as observed at a macroevolutionary scale. Here, we address this question by investigating how variation in cranial form and feeding mechanics relate to rapid changes in diet in an insular lizard (Podarcis siculus) after experimental introduction into a new environment. We first quantified differences in the skull shape and jaw muscle architecture between the source and introduced population using three-dimensional geometric morphometrics and dissections. Next, we tested the impact of the observed variation in morphology on the mechanical performance of the masticatory system using computer-based biomechanical simulation techniques. Our results show that small differences in shape, combined with variation in muscle architecture, can result in significant differences in performance allowing access to novel trophic resources. The confrontation of these data with the already described macroevolutionary relationships between cranial form and function in these insular lizards provides insights into how selection can, over relatively short time scales, drive major changes in ecology through its impact on mechanical performance.
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Affiliation(s)
- M Taverne
- UMR 7179, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique, Paris, France
| | - P J Watson
- Department of Engineering, University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - H Dutel
- Department of Engineering, University of Hull, Cottingham Road, Hull HU6 7RX, UK
- School of Earth Sciences, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, UK
| | - R Boistel
- UMR 7179, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique, Paris, France
| | - D Lisicic
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, Zagreb, Croatia
| | - Z Tadic
- Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, Zagreb, Croatia
| | - A-C Fabre
- Naturhistorisches Museum der Burgergemeinde Bern, Bernastrasse 15, 3005 Bern, Switzerland
- Institute of Ecology & Evolution, Universität Bern, Baltzerstrasse 6, 3012 Bern, Switzerland
- Department of Life Sciences, Natural History Museum, London SW7 5BD, UK
| | - M J Fagan
- Department of Engineering, University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - A Herrel
- UMR 7179, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique, Paris, France
- Naturhistorisches Museum der Burgergemeinde Bern, Bernastrasse 15, 3005 Bern, Switzerland
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Sender RS, Strait DS. The biomechanics of tooth strength: testing the utility of simple models for predicting fracture in geometrically complex teeth. J R Soc Interface 2023; 20:20230195. [PMID: 37376873 DOI: 10.1098/rsif.2023.0195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Teeth must fracture foods while avoiding being fractured themselves. This study evaluated dome biomechanical models used to describe tooth strength. Finite-element analysis (FEA) tested whether the predictions of the dome models applied to the complex geometry of an actual tooth. A finite-element model was built from microCT scans of a human M3. The FEA included three loading regimes simulating contact between (i) a hard object and a single cusp tip, (ii) a hard object and all major cusp tips and (iii) a soft object and the entire occlusal basin. Our results corroborate the dome models with respect to the distribution and orientation of tensile stresses, but document heterogeneity of stress orientation across the lateral enamel. This implies that high stresses might not cause fractures to fully propagate between cusp tip and cervix under certain loading conditions. The crown is most at risk of failing during hard object biting on a single cusp. Geometrically simple biomechanical models are valuable tools for understanding tooth function but do not fully capture aspects of biomechanical performance in actual teeth whose complex geometries may reflect adaptations for strength.
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Affiliation(s)
- Rachel S Sender
- Department of Anthropology, Washington University in St Louis, St Louis, MO 63013, USA
| | - David S Strait
- Department of Anthropology, Washington University in St Louis, St Louis, MO 63013, USA
- Paleo-Research Institute, University of Johannesburg, Auckland Park, Gauteng 2092, South Africa
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15
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Donihue CM, Herrel A, Taverne M, Foufopoulos J, Pafilis P. The Evolution of Diet and Morphology in Insular Lizards: Insights from a Replicated Island Introduction Experiment. Animals (Basel) 2023; 13:1788. [PMID: 37889735 PMCID: PMC10251849 DOI: 10.3390/ani13111788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/12/2023] [Accepted: 05/24/2023] [Indexed: 10/29/2023] Open
Abstract
Resource-limited environments may drive the rapid evolution of phenotypic traits and ecological preferences optimizing the exploitation of resources. Very small islands are often characterized by reduced food availability, seasonal fluctuations in resources and strong unpredictability. These features may drive the evolution of phenotypic traits such as high bite forces, allowing animals to exploit a wider variety of the available resources. They may also lead to more generalist dietary patterns in response to food scarcity. However, the lack of predators and competitors on such small islands often also leads to high densities and the evolution of strong sexual dimorphism, which may also drive the evolution of bite force. Here, we take advantage of a unique replicated introduction experiment to test whether lizards introduced into very small islands alter their feeding ecology and use different resources, resulting in the evolution of a large body size, large head size and large bite forces. Our results show that three years after their introduction, the island lizards were larger and had greater bite forces and more pronounced sexual dimorphism. However, the diets were only marginally different between animals from the source population on a very large nearby island and those on the islets. Moreover, distinct differences in diet between animals on the different islets were observed, suggesting that the local environment is a strong driver of resource use. Overall, lizards with absolutely and relatively (adjusted for body size) large bite forces did eat larger and harder prey. Taken together, our data suggest that intraspecific competition is an important driver of the rapid evolution of bite force, which may allow these lizards to exploit the scarce and fluctuating resources on the islets. Whether or not lizards will evolve to include other types of food such as plants in their diet, facilitated by their large bite forces, remains to be explored in future studies.
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Affiliation(s)
- Colin M. Donihue
- Institute at Brown for Environment and Society, Brown University, Providence, RI 02903, USA
| | - Anthony Herrel
- UMR 7179 Centre National de la Recherche Scientifique/Muséum National d’Histoire Naturelle, Département Adaptations du Vivant, Bâtiment d’Anatomie Comparée, 55 rue Buffon, 75005 Paris, France; (A.H.); (M.T.)
- Department of Biology, Functional Morphology, University of Antwerp, 2000 Antwerp, Belgium
- Department of Biology, Evolutionary Morphology of Vertebrates, Ghent University, 9000 Ghent, Belgium
| | - Maxime Taverne
- UMR 7179 Centre National de la Recherche Scientifique/Muséum National d’Histoire Naturelle, Département Adaptations du Vivant, Bâtiment d’Anatomie Comparée, 55 rue Buffon, 75005 Paris, France; (A.H.); (M.T.)
| | - Johannes Foufopoulos
- School for Environment and Sustainability, University of Michigan, Ann Arbor, MI 48109, USA;
| | - Panayiotis Pafilis
- Department of Biology, National and Kapodistrian University of Athens, 15784 Athens, Greece;
- Zoological Museum, National and Kapodistrian University of Athens, 15784 Athens, Greece
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Schuett GW, Peterson KH, Powell AR, Taylor JD, Alexander JR, Lappin AK. Female-female aggression in the Gila monster ( Heloderma suspectum). R Soc Open Sci 2023; 10:221466. [PMID: 37181791 PMCID: PMC10170349 DOI: 10.1098/rsos.221466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 04/14/2023] [Indexed: 05/16/2023]
Abstract
Historically, the role of aggression in the social lives of animals overwhelmingly focused on males. In recent years, however, female-female aggression in vertebrates, particularly lizards, has received increasing attention. This growing body of literature shows both similarities and differences to aggressive behaviours between males. Here, we document female-female aggression in captive Gila monsters (Heloderma suspectum). Based on four unique dyadic trials (eight adult female subjects), we developed a qualitative ethogram. Unexpected and most intriguing were the prevalence and intensity of aggressive acts that included brief and sustained biting, envenomation, and lateral rotation (i.e. rolling of body while holding onto opponent with closed jaws). Given specific behavioural acts (i.e. biting) and the results of bite-force experiments, we postulate that osteoderms (bony deposits in the skin) offer some degree of protection and reduce the likelihood of serious injury during female-female fights. Male-male contests in H. suspectum, in contrast, are more ritualized, and biting is rarely reported. Female-female aggression in other lizards has a role in territoriality, courtship tactics, and nest and offspring guarding. Future behavioural research on aggression in female Gila monsters is warranted to test these and other hypotheses in the laboratory and field.
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Affiliation(s)
- Gordon W. Schuett
- Department of Biology | Neuroscience Institute, Georgia State University, Atlanta, GA, USA
- Chiricahua Desert Museum, Rodeo, NM, USA
| | | | - Anthony R. Powell
- Biological Sciences Department, California State Polytechnic University, Pomona, CA, USA
| | - John D. Taylor
- Biological Sciences Department, California State Polytechnic University, Pomona, CA, USA
| | - Jennifer R. Alexander
- Biological Sciences Department, California State Polytechnic University, Pomona, CA, USA
| | - A. Kristopher Lappin
- Biological Sciences Department, California State Polytechnic University, Pomona, CA, USA
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Jabr CL, Oliveira LP, Campos LA, Campos JADB, de Oliveira Lima AL, de Assis Mollo Júnior F, Filho JNA. Handgrip Force and Bite force in dentulous and edentulous individuals. J Oral Rehabil 2023. [PMID: 37036746 DOI: 10.1111/joor.13461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 03/05/2023] [Accepted: 04/05/2023] [Indexed: 04/11/2023]
Abstract
BACKGROUND The literature is unclear about Bite Force (BF) and Handgrip Force (HF) in a specific group of different ages and dentate conditions, or even a predictive model for each specific group, using BF and HF as factors. OBJECTIVE To establish the correlation between HF and BF in female participants with distinct ages and dentate conditions; also create a predictive model of BF as a function of HF. METHODS Participants were divided into three groups (GI: young natural dentate women, n=65; GII: adult natural dentate women, n=67; and GIII: edentulous women users of bimaxillary complete dentures, n=67) and subjected to an HF measurement test using a digital dynamometer. Subsequently, BF was measured using a digital gnathodynamometer in the molar region. Pearson correlation coefficient (r) and multivariate analysis of variance (α=0.05) were performed, and simple linear regression was used to obtain a model to predict BF from HF for each group separately (α=0.05). RESULTS All groups presented moderate and strong correlations among the variables (GI: r=0.838; GII: r=0.714; GIII: r=0.646). A significant difference in BF was observed (GI> GII> GIII; p <0.05). GIII presented a significantly lower HF than the other groups (p <0.05). Besides, three equations predicting BF, using HF, were obtained for use in young / adult dentate and edentulous women. CONCLUSION All groups found a positive and significant correlation between BF, HF and groups. HF can be a simple and efficient method for predicting BF using the predictive models developed for women with a good health.
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Affiliation(s)
- Camila Luiz Jabr
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Araraquara
| | - Lucas Portela Oliveira
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Araraquara
| | - Lucas Arrais Campos
- Department of Pediatric Dentistry and Orthodontics, São Paulo State University (Unesp), Araraquara
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18
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Niwa K, Takahashi N. Elucidation of the relationship between masticatory muscle activity and masticatory movement. Report 1. Mechanism of occlusal force generation. Clin Exp Dent Res 2023. [PMID: 36924025 DOI: 10.1002/cre2.725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 02/16/2023] [Accepted: 02/24/2023] [Indexed: 03/18/2023] Open
Abstract
OBJECTIVES The purpose of this study was to elucidate how masticatory muscles are involved in the generation of occlusal force. MATERIALS AND METHODS The experiment was conducted by fabricating an experimental apparatus for a unilateral occlusion model with the masticatory muscles imparted. The experimental apparatus was fabricated by enlarging the lateral photograph of a dried adult skull specimen 3.5 times larger than that of a standard adult and drawing the outlines of the maxilla and mandible, canines and molars of the upper and lower jaws, and temporomandibular joint on a wooden board. The masticatory muscles used in the experiment were the masseter muscle, the temporalis muscle (anterior and posterior muscle bundles), and the lateral pterygoid muscle. For the measurement of the contractile force of the masticatory muscle, we used the spring scale. For the food, we used cut plastic cylinders. RESULTS The results of the experiment revealed the following: First, the occlusal force was generated under the condition that the contraction forces of all the masticatory muscles were balanced. Second, when the occlusal force was applied to food, the occlusal planes of the upper and lower jaws were parallel. Third, the occlusal force occurred perpendicular to the occlusal plane. Fourth, the occlusal force was generated with a force greater than the contraction force of the individual masticatory muscles. And finally, even if occlusal force was applied to the food, the occlusal force did not load the temporomandibular joint. CONCLUSION Occlusal force is not generated by the action of a single masticatory muscle but under the balanced contractile force of all masticatory muscles. The occlusal force then emerges with a force greater than the contraction force of all the masticatory muscles, and its direction occurs perpendicular to the occlusal plane.
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Affiliation(s)
- Katsumi Niwa
- Division of Dental Radiology, Department of Diagnostic and Therapeutic Sciences, Meikai University School of Dentistry, Saitama, Japan
| | - Nobuo Takahashi
- Division of Dental Radiology, Department of Diagnostic and Therapeutic Sciences, Meikai University School of Dentistry, Saitama, Japan
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19
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Bunpu P, Changsiripun C. Assessment of masticatory performance in patients undergoing orthognathic surgery: A systematic review and meta-analysis. J Oral Rehabil 2023. [PMID: 36920311 DOI: 10.1111/joor.13447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 02/10/2023] [Accepted: 02/28/2023] [Indexed: 03/16/2023]
Abstract
BACKGROUND One of the main goals of orthognathic surgery is to improve the masticatory performance in patients with maxillofacial deformities. OBJECTIVE The aim of this study was to evaluate the literature on assessing the masticatory performance before, after orthognathic surgery, and normal occlusion. METHODS An electronic search was performed via Pubmed, Scopus, LILACs, and Web of Science without any restrictions until June 2022. The articles assessing masticatory performance using a comminution assay, bite force, or occlusal contact area in patients undergoing orthognathic surgery with or without comparing controls were included. The risk of bias of the selected articles was assessed using the appropriate tools according to the study design. RESULTS Of the 2507 records identified, 21 studies were included in the qualitative evaluation and 17 studies in the meta-analysis. Nine articles were cohort studies, and the other eight were before-after studies. Moderate to high risks of bias were found among the articles. Comparing the values before and after surgery, the meta-analysis revealed a significant improvement in the bite force and occlusal contact area at 1-year and 2-years post-surgery. However, regardless of the assessed parameters, the masticatory performance in patients with normal occlusion was significantly greater than those in patients undergoing orthognathic surgery at all evaluated time points. CONCLUSION Although combined surgical-orthodontic treatment can improve impaired masticatory function, assessed by the comminution method, bite force, and occlusal contact area, the improvement may not reach that of a normal occlusion.
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Affiliation(s)
- Pokchat Bunpu
- Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Chidsanu Changsiripun
- Department of Orthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
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Alqutaibi AY, Alnazzawi AA, Farghal AE, Bakr RM, Mahmoud II. Impact of Acrylic and Silicone-Based Soft-Liner Materials on Biting Force and Quality of Life of the Complete Denture Wearers: A Randomized Clinical Trial. J Clin Med 2023; 12:jcm12052073. [PMID: 36902859 PMCID: PMC10003938 DOI: 10.3390/jcm12052073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023] Open
Abstract
This rerandomized clinical trial evaluated the influence of soft liners (SL) on biting force, pain perception, and the oral health-related quality of life (OHRQoL) of complete denture wearers. Twenty-eight completely edentulous patients complaining of ill-fitting lower complete dentures were selected to participate in the study from the Dental Hospital, College of Dentistry, Taibah University. All patients received new complete maxillary and mandibular dentures; then they were randomly divided into two groups (14 patients in each group): the acrylic-based SL group, in which the mandibular denture was lined with an acrylic-based soft liner, and the silicone-based SL group, in which the mandibular denture was lined with a silicone-based soft liner. OHRQoL and maximum bite force (MBF) were assessed in this study before denture relining (baseline), then at one month and three months after relining. The finding showed that both treatment modalities significantly improved the OHRQoL of included patients at one-month and three-month periods compared to baseline records (i.e., dentures before relining) with a statistically significant difference (p < 0.05). However, there is no statistical difference between groups at the baseline, one-, and three-month follow-up periods. Regarding maximum biting force, when acrylic-based SL is compared to silicone-based SL, there is no statistical difference between groups at baseline (75 ± 31 and 83 ± 32 N) and one-month follow-up periods (145 ± 53 and 156 ± 49 N); however, after three months of function, the silicone-based group recorded 166 ± 57 N statistically significant high biting force compared to the acrylic-based group that recorded 116 ± 47 N (p < 0.05). Permanent soft denture liners positively affect maximum biting force, pain perception, and OHRQoL more than conventional dentures. After three months, silicone-based SL outperformed acrylic-based soft liners in maximum biting force, which may indicate better long-term results.
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Affiliation(s)
- Ahmed Yaseen Alqutaibi
- Substitutive Dental Sciences Department, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia
- Prosthodontics Department, College of Dentistry, Ibb University, Ibb 70270, Yemen
- Correspondence:
| | - Ahmad A. Alnazzawi
- Substitutive Dental Sciences Department, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia
| | - Ahmed E. Farghal
- Substitutive Dental Sciences Department, College of Dentistry, Taibah University, Al Madinah 41311, Saudi Arabia
| | - Ramy M. Bakr
- Removable Prosthodontics Department, Future University, Cairo 11835, Egypt
| | - Ihab Ismail Mahmoud
- Removable Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo 11884, Egypt
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Ågren M, Nanchaipruek Y, Phumariyapong P, Apinuntham C, Rakchart S, Pettersson M, Wanitphakdeedecha R. Duration of bite force reduction following a single injection of botulinum toxin in the masseter muscle bilaterally: A one-year non-randomized trial. J Oral Rehabil 2023; 50:343-350. [PMID: 36810787 DOI: 10.1111/joor.13434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 11/07/2022] [Accepted: 02/09/2023] [Indexed: 02/24/2023]
Abstract
BACKGROUND Previous studies concerning the effect of botulinum toxin in masseter muscle have mainly reported effects observed through inspection of facial features or differences in pain levels. One systematic review of studies utilizing objective measurements reported that long-term muscular effect of botulinum neurotoxin injections into masseter muscle was inconclusive. OBJECTIVE To evaluate the duration of reduced maximal voluntary bite force (MVBF) after botulinum toxin intervention. METHODS The intervention group was comprised of individuals seeking aesthetic treatment for masseter reduction (n = 20), the reference group (n = 12) comprised of individuals with no intervention. Intervention through 25 units of Xeomin® (Merz Pharma GmbH & Co KGaA, Frankfurt am Main, Germany) botulinum neurotoxin type A injected into the masseter muscles bilaterally (totalling 50 units). A reference group did not receive any intervention. MVBF was measured in Newtons using a strain gauge meter at the incisors and first molars. MVBF was measured at baseline, at 4 weeks, 3 months, 6 months, and after 1 year. RESULTS Both groups were similar in terms of bite force, sex and age at baseline. MVBF remained similar compared to baseline in the reference group. At 3 months, a significant reduction at all measurement points was observed in the intervention group; at 6 months, this reduction was no longer significant. CONCLUSION A single intervention of 50 units of botulinum neurotoxin results in a reversible MVBF reduction of at least 3 months, although a visually discernable reduction may be more long-lasting.
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Affiliation(s)
- Martin Ågren
- Department of Odontology, Faculty of Medicine, Umeå University, Umeå, Sweden.,Prosthodontic Specialist Clinic, Region Västerbotten, Umeå, Sweden
| | - Yanisorn Nanchaipruek
- Department of Dermatology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Phumithep Phumariyapong
- Department of Dermatology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Chalermkwan Apinuntham
- Department of Dermatology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | - Mattias Pettersson
- Department of Odontology, Faculty of Medicine, Umeå University, Umeå, Sweden
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Marcelino V, De Rovere S, Paço M, Gonçalves M, Marcelino S, Guimarães AS, Pinho T. Masticatory Function in Individuals with Temporomandibular Disorders: A Systematic Review and Meta-Analysis. Life (Basel) 2023; 13. [PMID: 36836829 DOI: 10.3390/life13020472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/12/2023] [Accepted: 02/03/2023] [Indexed: 02/10/2023] Open
Abstract
The literature search was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) protocol in the PubMed, Cochrane Library, LILACS, EBSCO, Scielo, between 2012 and 2022. The methodological quality was assessed by using the Newcastle-Ottawa Study Quality Assessment Scale. Mean differences and 95% confidence intervals were calculated and combined in meta-analyses. A total of 1202 participants were included in this systematic review (690 with TMD; 512 without TMD), with 22 articles being included in the qualitative analysis. Only three studies enabled the comparative analysis of the results. Ten articles showed a high methodological quality and a low risk of bias, and twelve had a low methodological quality and an increased risk of bias. The meta-analysis showed that the differences between the intervention and control groups were not statistically significant for the percentage overlapping coefficient of the anterior temporal muscle, for the masseter, and for the torque coefficient. The parameters analyzed with the compound technique for chewing showed altered mandibular functions in individuals with TMD. With the EMG method, it was possible to suggest that TMD in adult individuals causes compensatory muscle behaviors, and several changes in the masticatory function were found.
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Steffen C, Duda K, Wulsten D, Voss JO, Koerdt S, Nahles S, Heiland M, Checa S, Rendenbach C. Clinical and Technical Validation of Novel Bite Force Measuring Device for Functional Analysis after Mandibular Reconstruction. Diagnostics (Basel) 2023; 13:diagnostics13040586. [PMID: 36832074 PMCID: PMC9955263 DOI: 10.3390/diagnostics13040586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/30/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Bite force measuring devices that are generally suitable for edentulous patients or patients undergoing mandibular reconstruction are missing. This study assesses the validity of a new bite force measuring device (prototype of loadpad®, novel GmbH) and evaluates its feasibility in patients after segmental mandibular resection. Accuracy and reproducibility were analyzed with two different protocols using a universal testing machine (Z010 AllroundLine, Zwick/Roell, Ulm, Germany). Four groups were tested to evaluate the impact of silicone layers around the sensor: no silicone ("pure"), 2.0 mm soft silicone ("2-soft"), 7.0 mm soft silicone ("7-soft") and 2.0 mm hard silicone ("2-hard"). Thereafter, the device was tested in 10 patients prospectively who underwent mandibular reconstruction using a fibula free flap. Average relative deviations of the measured force in relation to the applied load reached 0.77% ("7-soft") to 5.28% ("2-hard"). Repeated measurements in "2-soft" revealed a mean relative deviation of 2.5% until an applied load of 600 N. Maximum bite force decreased postoperatively by 51.8% to a maximum mean bite force of 131.5 N. The novel device guarantees a high accuracy and degree of reproducibility. Furthermore, it offers new opportunities to quantify perioperative oral function after reconstructive surgery of the mandible also in edentulous patients.
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Affiliation(s)
- Claudius Steffen
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
- Correspondence: ; Tel.: +49-30-450-655083; Fax: +49-30-450-555901
| | - Katharina Duda
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Dag Wulsten
- Julius Wolff Institute, Berlin Institute of Health, Charité–Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Jan O. Voss
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
- BIH Charité Clinician Scientist Program, Berlin Institute of Health, Charité–Universitätsmedizin Berlin, BIH Biomedical Innovation Academy, Charitéplatz 1, 10117 Berlin, Germany
| | - Steffen Koerdt
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Susanne Nahles
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Max Heiland
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Sara Checa
- Julius Wolff Institute, Berlin Institute of Health, Charité–Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Carsten Rendenbach
- Department of Oral and Maxillofacial Surgery, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
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24
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Cox PG, Watson PJ. Masticatory biomechanics of red and grey squirrels ( Sciurus vulgaris and Sciurus carolinensis) modelled with multibody dynamics analysis. R Soc Open Sci 2023; 10:220587. [PMID: 36816846 PMCID: PMC9929510 DOI: 10.1098/rsos.220587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
The process of feeding in mammals is achieved by moving the mandible relative to the cranium to bring the teeth into and out of occlusion. This process is especially complex in rodents which have a highly specialized configuration of jaw adductor muscles. Here, we used the computational technique of multi-body dynamics analysis (MDA) to model feeding in the red (Sciurus vulgaris) and grey squirrel (Sciurus carolinensis) and determine the relative contribution of each jaw-closing muscle in the generation of bite forces. The MDA model simulated incisor biting at different gapes. A series of 'virtual ablation experiments' were performed at each gape, whereby the activation of each bilateral pair of muscles was set to zero. The maximum bite force was found to increase at wider gapes. As predicted, the superficial and anterior deep masseter were the largest contributors to bite force, but the temporalis had only a small contribution. Further analysis indicated that the temporalis may play a more important role in jaw stabilization than in the generation of bite force. This study demonstrated the ability of MDA to elucidate details of red and grey squirrel feeding biomechanics providing a complement to data gathered via in vivo experimentation.
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Affiliation(s)
- Philip G. Cox
- Department of Cell and Developmental Biology, University College London, London, UK
- Department of Archaeology, University of York, York, UK
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25
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Tanoue K, Shimada K. Jaw mechanics in macrophagous lamniform sharks and their evolutionary and functional implications. Anat Rec (Hoboken) 2023; 306:311-325. [PMID: 36059141 DOI: 10.1002/ar.25071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 07/03/2022] [Accepted: 08/29/2022] [Indexed: 01/25/2023]
Abstract
Jaw mechanics of lamniform sharks were examined three-dimensionally to analyze the variability in jaw shape and the evolution of the jaw system based on the extant macrophagous species. Three-dimensional lever analysis was applied to lamniform jaws to calculate bite force at each tooth relative to maximum input force from jaw adductor muscles for interspecific comparison of efficiency in lamniform jaws. When total input force from the jaw adductor muscles on both working and balancing sides of the skull is considered, input force varies along the jaw because the contribution by balancing side muscles is not constant. The phylogenetically basal-most species, Mitsukurina owstoni, has the least efficient jaws due to posteriorly positioned jaw adductor muscles. Our study shows that the higher efficiency of jaws is regarded as apomorphic in lamniform phylogeny owing to the anterior extension of jaw adductor muscles relative to M. owstoni and a relative decrease in jaw length in relation to width seen in some species, both of which increase leverage. Differences in the efficiency of jaws among derived genera or species are due to the morphology of their jaws. The relationship between calculated bite force relative to maximum input force and tooth morphology indicates low relative bite forces being exerted at anteriorly located, narrow, piercing teeth, whereas high relative bite forces at posteriorly located, broad, cutting, or crushing-type teeth. As a result, the biting pressure during feeding is maintained throughout the tooth series.
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Affiliation(s)
- Kyo Tanoue
- Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka, Japan
| | - Kenshu Shimada
- Department of Environmental Science and Studies and Department of Biological Sciences, DePaul University, Chicago, Illinois, USA.,Sternberg Museum of Natural History, Fort Hays State University, Hays, Kansas, USA
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Sousa-Santos S, Silva AS, Sousa-Santos P, Vale T, Mendes JM. The Influence of Saliva pH on the Fracture Resistance of Two Types of Implant-Supported Bis-Acrylic Resin Provisional Crowns-An In Vitro Study. J Funct Biomater 2023; 14:jfb14020062. [PMID: 36826861 PMCID: PMC9965934 DOI: 10.3390/jfb14020062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 01/17/2023] [Accepted: 01/17/2023] [Indexed: 01/25/2023] Open
Abstract
Temporary restorations play a fundamental role in oral rehabilitation. A properly adapted implant-supported provisional restoration implies better esthetics, contouring and architectural modeling of the upper peri-implant tissue. This study aimed to evaluate the influence of oral pH on the fracture resistance of implant-supported provisional restorations made with two brands of bis-acrylic resin (LuxaCrown® and Protemp™ 4) and to compare the fracture resistance of these two materials. Twenty crowns (ten manufactured using each brand) served as a control, and another forty crowns (twenty of each brand) were aged using artificial saliva with pHs of 4 or 7, for 7 days at 37 °C, in an attempt to simulate the behavior of these materials inside the oral cavity. Subsequently, all crowns were subjected to the application of a force at a constant speed, in a universal testing machine, until fracture was achieved. The LuxaCrown® brand showed greater resistance to fracture than the Protemp™ 4 brand. Salivary pH did not influence the fracture resistance of provisional LuxaCrown® crowns but did influence the fracture resistance of provisional Protemp™ 4 crowns.
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Affiliation(s)
- Sofia Sousa-Santos
- Department of Dental Sciences, University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal
| | - António Sérgio Silva
- UNIPRO—Oral Pathology and Rehabilitation Research Unit, University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal
- Correspondence:
| | - Primavera Sousa-Santos
- UNIPRO—Oral Pathology and Rehabilitation Research Unit, University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal
| | - Teresa Vale
- UNIPRO—Oral Pathology and Rehabilitation Research Unit, University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal
| | - José Manuel Mendes
- UNIPRO—Oral Pathology and Rehabilitation Research Unit, University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal
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Wang P, Zhang Q, Dias FC, Suttle A, Dong X, Chen Y. TMEM100, a regulator of TRPV1-TRPA1 interaction, contributes to temporomandibular disorder pain. Front Mol Neurosci 2023; 16:1160206. [PMID: 37033371 PMCID: PMC10077888 DOI: 10.3389/fnmol.2023.1160206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 02/27/2023] [Indexed: 04/11/2023] Open
Abstract
There is an unmet need to identify new therapeutic targets for temporomandibular disorder (TMD) pain because current treatments are limited and unsatisfactory. TMEM100, a two-transmembrane protein, was recently identified as a regulator to weaken the TRPA1-TRPV1 physical association, resulting in disinhibition of TRPA1 activity in sensory neurons. Recent studies have also shown that Tmem100, Trpa1, and Trpv1 mRNAs were upregulated in trigeminal ganglion (TG) after inflammation of the temporomandibular joint (TMJ) associated tissues. These findings raise a critical question regarding whether TMEM100 in TG neurons is involved in TMD pain via regulating the TRPA1-TRPV1 functional interaction. Here, using two mouse models of TMD pain induced by TMJ inflammation or masseter muscle injury, we found that global knockout or systemic inhibition of TRPA1 and TRPV1 attenuated pain. In line with their increased genes, mice exhibited significant upregulation of TMEM100, TRPA1, and TRPV1 at the protein levels in TG neurons after TMD pain. Importantly, TMEM100 co-expressed with TRPA1 and TRPV1 in TG neurons-innervating the TMJ and masseter muscle and their co-expression was increased after TMD pain. Moreover, the enhanced activity of TRPA1 in TG neurons evoked by TMJ inflammation or masseter muscle injury was suppressed by inhibition of TMEM100. Selective deletion of Tmem100 in TG neurons or local administration of TMEM100 inhibitor into the TMJ or masseter muscle attenuated TMD pain. Together, these results suggest that TMEM100 in TG neurons contributes to TMD pain by regulating TRPA1 activity within the TRPA1-TRPV1 complex. TMEM100 therefore represents a potential novel target-of-interest for TMD pain.
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Affiliation(s)
- Peng Wang
- Department of Neurology, Duke University, Durham, NC, United States
| | - Qiaojuan Zhang
- Department of Neurology, Duke University, Durham, NC, United States
| | - Fabiana C. Dias
- Department of Neurology, Duke University, Durham, NC, United States
| | - Abbie Suttle
- Department of Neurology, Duke University, Durham, NC, United States
| | - Xinzhong Dong
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Yong Chen
- Department of Neurology, Duke University, Durham, NC, United States
- Center for Translational Pain Medicine, Department of Anesthesiology, Duke University, Durham, NC, United States
- Department of Pathology, Duke University, Durham, NC, United States
- *Correspondence: Yong Chen,
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28
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Ciavarella D, Fanelli C, Suriano C, Cazzolla AP, Campobasso A, Guida L, Laurenziello M, Illuzzi G, Tepedino M. Occlusal Plane Modification in Clear Aligners Treatment: Three Dimensional Retrospective Longitudinal Study. Dent J (Basel) 2022; 11. [PMID: 36661545 DOI: 10.3390/dj11010008] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 12/28/2022] Open
Abstract
The purpose of the present study was to evaluate: (i) maxillary occlusal plane changes after clear aligners therapy with a 3D measurement technique; and (ii) as a secondary outcome, if such changes were correlated to the patient’s 1axilla-mandibular divergence. 3D maxillary models of 32 patients (7 males and 25 females; mean age 22.3 +/− 3.4 year) treated with clear aligners were analyzed. The angle (α) between a reference palatine plane and a maxillary occlusal plane was measured. Five angular cephalometric measurements (NSL/MP; PP-OP; OP-MP; PP-MP; PFH/AFH%) were performed and related to Δα. The subjects were further divided into three groups according to facial divergence. After aligner treatment, Δα increased in hyperdivergent patients and decreased in hypodivergent patients (p < 0.05). Δα showed a significant positive correlation with NSL/MP (rho = 0.44) and negative correlation with PFH/AFH% (rho = −0.53). Aligners treatment produced a counterlockwise rotation of the maxillary occlusal plane, even if this rotation occurs differently depending on divergence.
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29
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Speksnijder CM, Mutsaers NEA, Walji S. Functioning of the Masticatory System in Patients with an Alloplastic Total Temporomandibular Joint Prostheses Compared with Healthy Individuals: A Pilot Study. Life (Basel) 2022; 12:life12122073. [PMID: 36556438 PMCID: PMC9784972 DOI: 10.3390/life12122073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/05/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Most patients with temporomandibular joint (TMJ) issues are successfully treated with nonsurgical methods. However, when end-stage TMJ pathologies occur, invasive management can be required, such as a total TMJ replacement. This cross-sectional pilot study aimed to provide insight into the functioning of the masticatory system, pain, and patient satisfaction in patients treated with a total joint replacement (TJR). METHODS A cross-sectional pilot study was conducted to determine the postoperative clinical results of an alloplastic TJR TMJ. Masticatory performance and also insight into maximum voluntary bite force (MVBF), active and passive maximum mouth opening (aMMO/pMMO), pain, and patient satisfaction were measured. Masticatory performance, MVBF, and aMMO of patients with a TJR TMJ were compared with healthy individuals. RESULTS Masticatory performance is equal between patients with a TJR TMJ and healthy individuals, but both MVBF and aMMO were significantly smaller in patients with a TJR TMJ. However, patients had almost no pain and were very satisfied with the TJR TMJ treatment. CONCLUSION This study revealed that most patients with an alloplastic TJR TMJ were able to function without pain, showed good masticatory performance, and were highly satisfied with their alloplastic TJR TMJ. However, MVBF and aMMO were lower than in healthy individuals.
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Affiliation(s)
- Caroline M. Speksnijder
- University Medical Center Utrecht, Department of Oral and Maxillofacial Surgery and Special Dental Care, Utrecht University, 3584 CX Utrecht, The Netherlands
- Department of Oral and Maxillofacial Surgery, Jeroen Bosch Hospital, 5223 GZ ‘s-Hertogenbosch, The Netherlands
- Correspondence:
| | - Nadiya E. A. Mutsaers
- University Medical Center Utrecht, Department of Oral and Maxillofacial Surgery and Special Dental Care, Utrecht University, 3584 CX Utrecht, The Netherlands
- Department of Oral and Maxillofacial Surgery, Jeroen Bosch Hospital, 5223 GZ ‘s-Hertogenbosch, The Netherlands
| | - Sajjad Walji
- University Medical Center Utrecht, Department of Oral and Maxillofacial Surgery and Special Dental Care, Utrecht University, 3584 CX Utrecht, The Netherlands
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Watanabe M, Kanazawa M, Sato D, Uehara Y, Miyayasu A, Iwaki M, Komagamine Y, Naing ST, Katheng A, Kusumoto Y, Abe Y, Baba K, Minakuchi S. Oral function of implant-assisted removable partial dentures with magnetic attachments using short implants: A prospective study. Clin Oral Implants Res 2022; 33:1265-1272. [PMID: 36222311 DOI: 10.1111/clr.14008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 09/22/2022] [Accepted: 10/02/2022] [Indexed: 12/13/2022]
Abstract
OBJECTIVES This prospective study aimed to compare the oral functions of removable partial dentures (RPDs) with those of implant-assisted removable partial dentures (IARPDs) with short implants and magnetic attachments in patients with mandibular Kennedy class I and II. MATERIAL AND METHODS Thirty participants with mandibular Kennedy class I or II and at least three distal missing teeth were recruited. Oral functions, including mixing ability, comminuting ability, maximum bite force, and occlusal contact area, were assessed for RPDs (stage 0), IARPDs with healing caps (stage 1), and IARPDs with magnetic attachments (stage 2). The implants were loaded with occlusal force in stages 1 and 2. Finally, the data of the 27 participants who completed the evaluation at stage 2 were analyzed. The Wilcoxon signed-rank test with Bonferroni correction was used to assess the differences in the oral functions among the different stages. RESULTS The implant survival rate was 93.8%. There were significant differences in the comminuting ability and occlusal contact area between stages 0 and 2 (p < .001 and p = .036, respectively) and stages 1 and 2 (p = .003 and p = .015, respectively). Regarding the maximum bite force, there was a significant difference between stages 1 and 2 (p = .018). However, there was no significant difference in the mixing ability between the three stages. CONCLUSIONS Within the limitations of this study, it was concluded that IARPDs in the mandible with short implants and magnetic attachments may improve oral functions.
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Affiliation(s)
- Masataka Watanabe
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Manabu Kanazawa
- Digital Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Daisuke Sato
- Department of Implant Dentistry, School of Dentistry, Showa University, Tokyo, Japan
| | - Yoko Uehara
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Anna Miyayasu
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Maiko Iwaki
- Digital Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yuriko Komagamine
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Sai Tun Naing
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Awutsadaporn Katheng
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yuriko Kusumoto
- Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Yuka Abe
- Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Kazuyoshi Baba
- Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Shunsuke Minakuchi
- Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Novais M, Silva AS, Mendes J, Barreiros P, Aroso C, Mendes JM. Fracture Resistance of CAD/CAM Implant-Supported 3Y-TZP-Zirconia Cantilevers: An In Vitro Study. Materials (Basel) 2022; 15:6638. [PMID: 36233980 PMCID: PMC9571496 DOI: 10.3390/ma15196638] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/17/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
(1) Introduction: Implant-supported fixed complete dentures are mostly composed of cantilevers. The purpose of this work was to evaluate the fracture resistance of zirconia (Prettau®, second generation, or Ice Zirkon Translucent, first generation) with cantilever lengths of 6 and 10 mm, and zirconia’s fracture resistance in relation to an average bite force of 250 N. (2) Materials and methods: Forty structures were created in CAD/CAM and divided into four groups: group A (6 mm cantilever in IZT), group B (10 mm cantilever in IZT), group C (6 mm cantilever in Pz), and group D (10 mm cantilever in pz). The study consisted of a traditional “load-to-failure” test. (3) Results: A statistically significant result was found for the effect of cantilever length, t(38) = 16.23 (p < 0.001), with this having a large effect size, d = 4.68. The 6 mm cantilever length (M = 442.30, sd = 47.49) was associated with a higher mean force at break than the 10 mm length (M = 215.18, sd = 40.74). No significant effect was found for the type of zirconia: t(38) = 0.31 (p = 0.757), and d = 0.10. (4) Conclusions: All the components with cantilever lengths of 6 mm broke under forces higher than 250 N. Cantilevers larger than 10 mm should be avoided.
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Ueno Y, Iwasaki M, Kimura Y, Kakuta S, Masaki C, Wada T, Sakamoto R, Ishimoto Y, Fujisawa M, Okumiya K, Ansai T, Matsubayashi K, Hosokawa R. Periodontal status is associated with oral function in community-dwelling older adults, independent of dentition status. J Periodontal Res 2022; 57:1139-1147. [PMID: 36059203 DOI: 10.1111/jre.13051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 08/10/2022] [Accepted: 08/22/2022] [Indexed: 10/14/2022]
Abstract
OBJECTIVE To determine whether periodontal status is associated with oral function, including masticatory performance and occlusal force, among community-dwelling older adults. BACKGROUND Although a potential association between periodontal status and oral function has been reported, variations in the root surface area (RSA) of each tooth have not been considered. METHODS We used data from a population-based study involving community-dwelling older adults. The RSA with periodontal ligament (RSA-PL), which quantifies the RSA attached to the periodontal ligament and alveolar bone, was calculated based on full-mouth periodontal examination. Masticatory performance was assessed using spectrophotometric measurement of the color (a* value) of color-changing chewing gum. The bilateral maximal occlusal force (MOF) was measured using a pressure-sensitive sheet and dedicated software. The associations of the RSA-PL, a quantitative marker of periodontal tissue support, with the a* value and MOF were assessed using linear regression models. RESULTS The analyses included data from 250 adults [60.8% women; age, mean (standard deviation) 82.5 (5.0) years]. On average, the study participants had an RSA-PL of 26.3 cm2 , a* value of 25.0, and an MOF value of 555.1 N. After adjustments for potential confounders, including dentition status, age, sex, dental visit regularity, smoking status, physical activity level, depressive symptoms, a history of stroke or diabetes mellitus, and body mass index, the RSA-PL was found to be associated with the a* value [coefficient (per 1 cm2 increase): 0.16, 95% confidence interval (CI) 0.10-0.22)] and MOF (coefficient: 9.2, 95% CI 5.3-13.1). CONCLUSION This study demonstrated that greater amounts of remaining tooth-supporting structures, indicated by higher RSA-PL values, were associated with better masticatory performance and a higher occlusal force among community-dwelling older adults.
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Affiliation(s)
- Yui Ueno
- Division of Oral Reconstruction and Rehabilitation, Kyushu Dental University, Kitakyushu City, Japan
| | | | - Yumi Kimura
- Graduate School of Human Sciences, Osaka University, Suita City, Japan
| | - Satoko Kakuta
- Division of Community Oral Health Development, Kyushu Dental University, Kitakyushu City, Japan
| | - Chihiro Masaki
- Division of Oral Reconstruction and Rehabilitation, Kyushu Dental University, Kitakyushu City, Japan
| | - Taizo Wada
- Center for Southeast Asian Studies, Kyoto University, Kyoto City, Japan
| | - Ryota Sakamoto
- Center for Southeast Asian Studies, Kyoto University, Kyoto City, Japan
| | - Yasuko Ishimoto
- Department of Health and Sports Science, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Kitakyushu City, Japan
| | - Michiko Fujisawa
- Center for Southeast Asian Studies, Kyoto University, Kyoto City, Japan
| | - Kiyohito Okumiya
- Center for Southeast Asian Studies, Kyoto University, Kyoto City, Japan
| | - Toshihiro Ansai
- Division of Community Oral Health Development, Kyushu Dental University, Kitakyushu City, Japan
| | - Kozo Matsubayashi
- Center for Southeast Asian Studies, Kyoto University, Kyoto City, Japan
| | - Ryuji Hosokawa
- Division of Oral Reconstruction and Rehabilitation, Kyushu Dental University, Kitakyushu City, Japan
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Atar Y, Atar S, Anarat MEA, Berkiten M, Saricam SS, Demirhan E, Mersinlioglu G, Dıraçoğlu D. Effect of adenoid hypertrophy and adenoidectomy on bite force in children: Twelve month follow-up, case-control study. Cranio 2022:1-9. [PMID: 36018777 DOI: 10.1080/08869634.2022.2116526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
OBJECTIVE The effects of adenoid hypertrophy (AH) and adenoidectomy on maximal bite force (MBF) in patients were evaluated by comparing them with healthy controls. METHODS A total of 118 children diagnosed with AH and undergoing adenoidectomy (Group A), and healthy controls (Group B) were included. The MBF and nasopharyngeal airway passage distance (NAPD) were recorded. RESULTS There was a correlation between NAPD and MBF at the beginning of the study (r = -0.675 and p < 0.001). The initial mean MBF of Groups A and B were 318.37 ± 70.76 N and 344.04 ± 64.14 N, respectively (p = 0.041). However, there was no significant difference between the groups due to the increase in the MBF of Group A at 12 months (p = 0.165). CONCLUSION The MBF may be negatively affected in proportion to decreased NAPD, and it could also be an indicator for monitoring the status of children with AH.
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Affiliation(s)
- Yavuz Atar
- Department of Otorhinolaryngology, Acibadem Maslak Hospital, Istanbul, Turkey
| | - Sevgi Atar
- Department of Physical Medicine and Rehabilitation, University of Health Sciences, Prof. Dr. Cemil Tascioglu City Hospital, Istanbul, Turkey
| | - Melis Ece Arkan Anarat
- Department of Otorhinolaryngology, University of Health Sciences, Prof. Dr. Cemil Tascioglu City Hospital, Istanbul, Turkey
| | - Mustafa Berkiten
- School of Dentistry, Department of Endodontics, Istanbul Health and Technology University, Istanbul, Turkey
| | - Sabire Sitare Saricam
- Department of Otorhinolaryngology, University of Health Sciences, Prof. Dr. Cemil Tascioglu City Hospital, Istanbul, Turkey
| | - Esma Demirhan
- Department of Physical Medicine and Rehabilitation, University of Health Sciences, Prof. Dr. Cemil Tascioglu City Hospital, Istanbul, Turkey
| | - Gökhan Mersinlioglu
- Department of Otorhinolaryngology, Private Clinic of Otorhinolaryngology, Istanbul, Turkey
| | - Demirhan Dıraçoğlu
- Department of Physical Medicine and Rehabilitation, Istanbul University Istanbul Faculty of Medicine, Istanbul, Turkey
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Shu X, Fan Y, Leung KCM, Lo ECM. Masticatory function of stroke patients: A systematic review with meta-analysis. Gerodontology 2022; 40:172-182. [PMID: 36004768 DOI: 10.1111/ger.12653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE The present systematic review and meta-analysis aimed to summarise the current information on the masticatory function of stroke patients. METHODS Four electronic databases (Medline, Embase, CINAHL and Web of Science) were searched for relevant observational studies and clinical trials (up to Jun 2021) on the masticatory function of stroke patients. Two reviewers independently performed study selection and quality assessments (using JBI Critical Appraisal Checklist). Meta-analysis was conducted for the comparison of bite force and masticatory performance using standardised mean difference (SMD). Of the 3837 records identified, nine studies, corresponding to 11 papers and 302 participants, were included in the analysis. RESULTS The maximum bite force of stroke patients was significantly lower than that of the healthy individuals (SMD -0.52, 95% CI: -0.95 to -0.08, P = .02). There was no significant difference between the ipsi-lesional and the contra-lesional sides of the same stroke patient (SMD 0.13, 95% CI: -0.14 to 0.39, P = .34). Stroke patients had lower masticatory performance than healthy people (SMD -0.97, 95% CI: 0.57 to 1.37, P < .00001), and the contra-lesional side was worse than the ipsi-lesional side. Electromyographic analysis indicated that muscle activation of stroke patients was poorer than the healthy individuals, and stroke patients seem to exhibit dysfunction in the recruiting and firing of motor units. CONCLUSIONS Stroke patients have lower maximum bite force and masticatory performance than healthy people, with masticatory performance being the most affected.
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Affiliation(s)
- Xin Shu
- Faculty of Dentistry, The University of Hong Kong. Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - Yanpin Fan
- Faculty of Dentistry, The University of Hong Kong. Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - Katherine Chiu Man Leung
- Faculty of Dentistry, The University of Hong Kong. Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - Edward Chin Man Lo
- Faculty of Dentistry, The University of Hong Kong. Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
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Bech K, Fogh FM, Lauridsen EF, Sonnesen L. Temporomandibular disorders, bite force and osseous changes of the temporomandibular joints in patients with hypermobile Ehlers-Danlos syndrome compared to a healthy control group. J Oral Rehabil 2022; 49:872-883. [PMID: 35694904 PMCID: PMC9544469 DOI: 10.1111/joor.13348] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 05/09/2022] [Accepted: 06/02/2022] [Indexed: 12/02/2022]
Abstract
Background Ehlers‐Danlos syndrome (EDS) is a hereditary disorder that affects the connective tissue and collagen structures in the body characterised by joint hypermobility, skin hyperextensibility and tissue fragility. Objective The aim was to investigate temporomandibular disorders (TMD), bite force, teeth in occlusal contact and osseous changes of the temporomandibular joints (TMJs) in 26 patients with hypermobile EDS (hEDS), differentiated by a genetic test, compared to 39 healthy controls. Methods Clinical examination according to Diagnostic Criteria for Temporomandibular Disorders (DC/TMD), radiological examinations of the TMJs by cone‐beam‐computed tomographic (CBCT) scans, registration of bite force and teeth in occlusal contact was performed. Statistical analyses included Fisher's Exact Test, multiple logistic and linear regression models adjusted for age, gender and Body Mass Index (BMI). Results Single symptoms and signs of TMD occurred significantly more often in hEDS (p = .002; p = .001; p = .003; p = <.0001; p = .012) and maximum mouth opening was significantly smaller in hEDS compared to controls (p = <.0001). The DC/TMD diagnosis myalgia, myofascial pain with referral, arthralgia, headache attributed to TMD, disc displacement disorders and degenerative joint disease occurred significantly more often in hEDS compared to controls (p = .000; p = .008; p = .003; p = .000; p = <.0001; p = .010, respectively). No significant differences were found in bite force and in teeth in occlusal contact between the groups (p > .05). On CBCT of the TMJs, subcortical sclerosis occurred significantly more often in hEDS compared to controls (p = .005). Conclusion Symptoms and signs of TMD and osseous changes of the TMJs occurred significantly more often in hEDS. Bite force and teeth in occlusal contact were comparable to controls.
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Affiliation(s)
- Karen Bech
- Section of Orthodontics, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Frederikke Maria Fogh
- Section of Orthodontics, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Eva Fejerskov Lauridsen
- Resource Center for Rare Oral Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Liselotte Sonnesen
- Section of Orthodontics, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Santana SE, Grossnickle DM, Sadier A, Patterson E, Sears KE. Bat Dentitions: A Model System for Studies at The Interface of Development, Biomechanics, and Evolution. Integr Comp Biol 2022; 62:icac042. [PMID: 35575617 DOI: 10.1093/icb/icac042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The evolution of complex dentitions was a major innovation in mammals that facilitated the expansion into new dietary niches that imposed selection for tight form-function relationships. Teeth allow mammals to ingest and process food items by applying forces produced by a third-class lever system composed by the jaw adductors, the cranium, and the mandible. Physical laws determine changes in jaw adductor (biting) forces at different bite point locations along the mandible (outlever), thus individual teeth are expected to experience different mechanical regimes during feeding. If the mammal dentition exhibits functional adaptations to mandible feeding biomechanics, then teeth are expected to have evolved to develop mechanically-advantageous sizes, shapes, and positions. Here, we present bats as a model system to test this hypothesis and, more generally, for integrative studies of mammal dental diversity. We combine a field-collected dataset of bite forces along the tooth row with data on dental and mandible morphology across 30 bat species. We (1) describe, for the first time, bite force trends along the tooth row of bats, (2) use phylogenetic comparative methods to investigate relationships among bite force patterns, tooth and mandible morphology, and (3) hypothesize how these biting mechanics patterns may relate to the developmental processes controlling tooth formation. We find that bite force variation along the tooth row is consistent with predictions from lever mechanics models, with most species having the greatest bite force at the first lower molar. The cross-sectional shape of the mandible body is strongly associated with the position of maximum bite force along the tooth row, likely reflecting mandibular adaptations to varying stress patterns among species. Further, dental dietary adaptations seem to be related to bite force variation along molariform teeth, with insectivorous species exhibiting greater bite force more anteriorly, narrower teeth and mandibles, and frugivores/omnivores showing greater bite force more posteriorly, wider teeth and mandibles. As these craniodental traits are linked through development, dietary specialization appears to have shaped intrinsic mechanisms controlling traits relevant to feeding performance.
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Affiliation(s)
- Sharlene E Santana
- Department of Biology, University of Washington, Seattle, WA
- Burke Museum of Natural History and Culture, University of Washington, Seattle, WA
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Iwasaki M, Maeda I, Kokubo Y, Tanaka Y, Ueno T, Ohara Y, Motokawa K, Hayakawa M, Shirobe M, Edahiro A, Kawai H, Fujiwara Y, Ihara K, Kim H, Watanabe Y, Obuchi S, Hirano H. Standard Values and Concurrent Validity of a Newly Developed Occlusal Force-Measuring Device among Community-Dwelling Older Adults: The Otassha Study. Int J Environ Res Public Health 2022; 19:5588. [PMID: 35564983 PMCID: PMC9104369 DOI: 10.3390/ijerph19095588] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 04/29/2022] [Accepted: 05/01/2022] [Indexed: 01/27/2023]
Abstract
Recently, an occlusal force-measuring device with a capacitive-type pressure-mapping sensor (OFMD-CPS) was developed. We aimed to establish age- and sex-specific standard values for OFMD-CPS-measured occlusal force (OF) and to assess the concurrent validity of the OFMD against another OF measuring system with a pressure-sensitive sheet (Dental Prescale II). Using data from a population-based study, we calculated the OFMD-CPS-measured OF means and deciles in 5-year age groups for each sex. The OFMD-CPS-measured OF was validated against the Dental Prescale II-measured OF with Spearman correlation coefficients. Furthermore, we calculated the area under the receiver operating characteristic curve (AUC) against the preexisting Dental Prescale II-measured OF cutoff value of 350 N. In total, 596 individuals (236 men and 360 women) with a mean (standard deviation (SD)) age of 73.7 (6.7) years were included in the analyses. The mean (SD) OFMD-CPS-measured OFs were 581.6 (284.6) N in men and 446.9 (209.9) N in women. There was a strong positive correlation (Spearman's Rho = 0.73) between OFMD-CPS-measured and Dental Prescale II-measured OF. The diagnostic accuracy of the OFMD-CPS-measured OF for the Dental Prescale II-measured OF cutoff value was high (AUC = 0.88). In conclusion, we demonstrated standard values and concurrent validity of OFMD-CPS-measured OF in community-dwelling older adults.
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Affiliation(s)
- Masanori Iwasaki
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Ichinosuke Maeda
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi, Aichi 485-8550, Japan; (I.M.); (Y.K.); (Y.T.); (T.U.)
| | - Yota Kokubo
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi, Aichi 485-8550, Japan; (I.M.); (Y.K.); (Y.T.); (T.U.)
| | - Yoshitomo Tanaka
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi, Aichi 485-8550, Japan; (I.M.); (Y.K.); (Y.T.); (T.U.)
| | - Tetsuji Ueno
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi, Aichi 485-8550, Japan; (I.M.); (Y.K.); (Y.T.); (T.U.)
| | - Yuki Ohara
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Keiko Motokawa
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Misato Hayakawa
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Maki Shirobe
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Ayako Edahiro
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Hisashi Kawai
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Yoshinori Fujiwara
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Kazushige Ihara
- Department of Social Medicine, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki-shi 036-8562, Japan;
| | - Hunkyung Kim
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Yutaka Watanabe
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
- Gerontology, Department of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Kita 13-jo Nishi 7-chome, Kita-ku, Sapporo-shi 060-8586, Japan
| | - Shuichi Obuchi
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
| | - Hirohiko Hirano
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (Y.O.); (K.M.); (M.H.); (M.S.); (A.E.); (H.K.); (Y.F.); (H.K.); (Y.W.); (S.O.); (H.H.)
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Ansar AS, Munna K, Iqbal A, Mohammad F, Naved A, Shamimul H. Prognostic criteria for the management of temporomandibular disorders using arthrocentesis with normal saline and arthrocentesis with normal saline and platelet-rich plasma. J Med Life 2022; 15:698-704. [PMID: 35815075 PMCID: PMC9262257 DOI: 10.25122/jml-2021-0240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 11/10/2021] [Indexed: 11/29/2022] Open
Abstract
Temporomandibular joint disorders (TMDs) are ailments affecting the jaws and allied structures, resulting in many pathologies (TMJ hypermobility, internal disc derangement, bone changes, degenerative disorders, and ankylosis). Pain, clicking or crepitus, restricted range of motion, deranged jaw function, and deflected or deviated mouth opening and closing are the commonly observed manifestations in TMDs. Internal derangement refers to an aberrant relation of the articular disc to the condyle and fossa, respectively. Conventional therapies highlight the role of non-invasive conservative treatment strategies, namely joint unloading, anti-inflammatory drugs, and physiotherapy. Current literature has emphasized the use of corticosteroids and platelet-rich plasma (PRP) as treatment strategies in TMDs. This study aimed to evaluate whether intra-articular injection of PRP after normal saline lavage in TMJ minimizes the symptoms of TMDs, as compared to injection of normal saline. Thirty patients with TMD according to research diagnostic criteria (RDC) were selected. One group received arthrocentesis with normal saline, and the other group received arthrocentesis with PRP injection. The patients were assessed for pain, maximum inter-incisal mouth opening, bite force, and TMJ sounds. TMDs treated by PRP injection had slightly better results. More studies are required to substantiate the outcome. Injections of PRP were more effective in reducing the symptoms than arthrocentesis with normal saline.
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Affiliation(s)
- Ahmad Syed Ansar
- Department of Oral and Maxillofacial Surgery, Jamia Millia Islamia Central University, New Delhi, India
| | - Khan Munna
- Department of Electrical Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia Central University, New Delhi, India
| | - Asif Iqbal
- Department of Electrical Engineering, Vivekananda Global University, Rajasthan, India
| | - Faisal Mohammad
- Department of Oral and Maxillofacial Surgery, Jamia Millia Islamia Central University, New Delhi, India
| | - Alam Naved
- Department of Computer Sciences, Jamia Hamdard, New Delhi, India
| | - Hasan Shamimul
- Department of Oral Medicine and Radiology, Faculty of Dentistry, Jamia Millia Islamia Central University, New Delhi, India
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Eberhard L, Rues S, Bach L, Lenz J, Schindler HJ. Biomechanical properties of masticatory balance in cases with RPDs-The influence of preferred and nonpreferred chewing side: A pilot study. Clin Exp Dent Res 2022; 8:912-922. [PMID: 35484837 PMCID: PMC9382054 DOI: 10.1002/cre2.576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 03/19/2022] [Indexed: 11/14/2022] Open
Abstract
Objectives Removable partial dentures (RPDs) are inserted with the aim to restore masticatory function. There is however inconsistent evidence supporting the alleged improvements, posterior occlusal contacts being one of the decisive factors. We hypothesized that the distribution of abutment teeth in RPDs influences masticatory performance and functional parameters. To evaluate the masticatory performance and functional parameters in patients with a RPD using a single mathematical parameter (tilting index [TI]) for both jaws that predicts biomechanical behavior on the basis of the distribution of abutment teeth. Materials and Methods Masticatory performance was measured in patients wearing long‐time adapted RPDs using the standardized test food optocal, yielding the mean particle size (X50). Mastication on the preferred and nonpreferred chewing sides was analyzed. Total muscle work (TMW) was calculated using bipolar electromyographic recordings of the masseter and anterior temporalis muscle. Functional parameters were subjected to multiple linear regression analysis including X50 as a dependent variable and functional units (FU), the number of teeth, bite forces, and sagittal and frontal components of TI (TI α and TI β) as independent variables. Results When the preferred chewing side was tested, none of the investigated parameters correlated significantly with X50. In contrast, chewing on the nonpreferred side was correlated significantly with performance for most variables (p < .05). This means that increased dental support improved chewing performance with RPDs under these conditions. Conclusions In well‐adapted RPDs, the distribution of abutment teeth as expressed by the tilting index seems to be of subordinate importance for masticatory performance.
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Affiliation(s)
- Lydia Eberhard
- Department of Prosthodontics, University of Heidelberg, Heidelberg, Germany
| | - Stefan Rues
- Department of Prosthodontics, University of Heidelberg, Heidelberg, Germany
| | - Lea Bach
- Department of Prosthodontics, University of Heidelberg, Heidelberg, Germany
| | - Jürgen Lenz
- Institute of Mechanics, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Hans J Schindler
- Department of Prosthodontics, University of Würzburg, Würzburg, Germany
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Jockusch J, Hahnel S, Sobotta BBAJ, Nitschke I. The Effect of a Masticatory Muscle Training Program on Chewing Efficiency and Bite Force in People with Dementia. Int J Environ Res Public Health 2022; 19:ijerph19073778. [PMID: 35409460 PMCID: PMC8997984 DOI: 10.3390/ijerph19073778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/08/2022] [Accepted: 03/11/2022] [Indexed: 12/04/2022]
Abstract
Until now, no study has investigated the effects of masticatory muscle training on chewing function in people with dementia. This study aimed to investigate whether physiotherapeutic exercises for the masticatory muscles have an influence on chewing efficiency and bite force in people with dementia. In a clinical trial with stratified randomization subjects were assigned to three groups based on the Mini Mental State Examination (MMSE: group 1—28–30, group 2—25–27, group 3—18–24). Each group was divided into an experimental (ExpG, intervention) and control group (ConG, no intervention). As intervention a Masticatory Muscle Training (MaMuT) (part 1: three physiotherapeutic treatments and daily home exercises, part 2: daily home exercises only) was carried out. Chewing efficiency and bite force were recorded. The MaMuT influenced the masticatory performance regardless of the cognitive state. Bite force increased in ExpG 1 and 2. Without further training, however, the effect disappeared. Chewing efficiency increased in all ExpG. After completion of the training, the ExpG 2 and 3 showed a decrease to initial values. Subjects of ExpG 1 showed a training effect at the final examination, but a tendency toward the initial values was observed. ExpG 3 seemed to benefit most from the physiotherapeutic exercises in terms of improving chewing efficiency by the end of the intervention phase. ExpG 1 showed the greatest gain in bite force. The MaMuT program is a potential method of improving masticatory performance in people with cognitive impairment or dementia when used on a daily basis.
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Affiliation(s)
- Julia Jockusch
- Department of Prosthodontics and Materials Science, Gerodontology Section, University of Leipzig, 04103 Leipzig, Germany; (S.H.); (B.B.A.J.S.); (I.N.)
- University Research Priority Program “Dynamics of Healthy Aging”, University of Zurich, Andreasstrasse 15/Box 2, 8050 Zurich, Switzerland
- Correspondence: or
| | - Sebastian Hahnel
- Department of Prosthodontics and Materials Science, Gerodontology Section, University of Leipzig, 04103 Leipzig, Germany; (S.H.); (B.B.A.J.S.); (I.N.)
| | - Bernhard B. A. J. Sobotta
- Department of Prosthodontics and Materials Science, Gerodontology Section, University of Leipzig, 04103 Leipzig, Germany; (S.H.); (B.B.A.J.S.); (I.N.)
| | - Ina Nitschke
- Department of Prosthodontics and Materials Science, Gerodontology Section, University of Leipzig, 04103 Leipzig, Germany; (S.H.); (B.B.A.J.S.); (I.N.)
- Clinic of General, Special Care and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
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Ngoc DV, Phuc LH, Tien CH, Tuan NV, Chanh LT, Phuong LH, Duc NM. Evaluation of Bite Force After Treatment of Le Fort Fractures by Internal Fixation and Mandibulomaxillary Fixation. Med Arch 2022; 75:371-374. [PMID: 35169360 PMCID: PMC8740670 DOI: 10.5455/medarh.2021.75.371-374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Accepted: 08/21/2021] [Indexed: 12/02/2022] Open
Abstract
Objectives: Evaluation of bite force one, two, and four weeks after discharge following treatment of Le Fort I and/or Le Fort II fracture by rigid fixation and mandibulomaxillary fixation. Objective: The aim of this study was to evaluate bite force following treatment of Le Fort I and/or Le Fort II fractures by rigid fixation and mandibulomaxillary fixation at one, two, and four weeks after discharge. This provides valuable results to guide the development of a treatment protocol for Le Fort fractures. Method: This was a prospective study including 31 patients who underwent followup examination three times after being discharged from hospital. The examination evaluated bite force using a bite force meter in the right molar, left molar, and incisor regions. Results: One week after discharge, bite forces in the right molar, left molar, and incisor regions were 94.29 ± 58.80 N, 95.42 ± 57.34 N, and 39,94 ± 30,29 N, respectively. Two weeks after discharge, bite forces in the right molar, left molar, and incisor regions were 153.84 ± 89.14 N, 153.00 ± 78.55 N, and 65,9 ± 43.89 N, respectively. Four weeks after discharge, bite forces in the right molar, left molar, and incisor regions were 279.77 ± 95.46 N, 285.00 ± 90,47 N, and 123.42 ± 54.04 N, respectively. Conclusions: Bite forces in the right molar, left molar, and incisor regions were significantly increased one week, two weeks, and four weeks after discharge. Bite force may be a helpful parameter to confirm the stability of the midface bone after treatment of Le Fort fractures.
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Affiliation(s)
- Doan-Van Ngoc
- Department of Radiology, VNU University of Medicine and Pharmacy, Hanoi, Vietnam
| | - Le Hoai Phuc
- Faculty of Dentistry, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam
| | - Cao Huu Tien
- Faculty of Dentistry, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam
| | - Nguyen-Van Tuan
- Faculty of Dentistry, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam.,Department of Maxillofacial surgery, Ho Chi Minh City National Hospital of Odonto-Stomatology, Vietnam
| | - Le Trung Chanh
- Faculty of Dentistry, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam.,Ho Chi Minh City National Hospital of Odonto-Stomatology, Vietnam
| | - Lam Hoai Phuong
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh, Ho Chi Minh City, Vietnam
| | - Nguyen Minh Duc
- Department of Radiology, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam
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Shabbir S, Sattar A, Sami QUA, Zia B, Pervez H. Bite Force Changes in Bilateral Cleft Lip and Palate Patients Before and After ALT-RAMEC Protocol. Cleft Palate Craniofac J 2022; 60:586-590. [PMID: 35130093 DOI: 10.1177/10556656211072730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
To evaluate the bite force (BF) changes in bilateral cleft lip and palate (BCLP) in contrast to the non BCLP children after ALT-RAMEC Facemask therapy. The prospective study was carried out on a total of 60 subjects of age 6 to 13 years in a tertiary care hospital; treatment group, 30 children with BCLP and control group, 30 children without cleft lip and palate. Each cleft patient was received ALT-RAMEC Facemask treatment and their BF assessed at 4 different stages. Bite force taken before treatment, immediately, 3 months and 6 months after treatment. Bite force of the control group was taken at baseline to compare with the treatment group to demonstrate the difference in BF values. Independent t test and analysis of variance were used to perform statistical analysis. There was a significant difference in BF between the treatment group (BCLP) 122.53 ± 8.64 N and the control group (non BCLP) 181.38 ± 18.84 N at baseline. After the Alt RAMEC protocol, changes in BF recorded over 3 and 6 months of therapy showed significant improvement. The mean values of BF at 3months and 6 months were 106.7 ± 9.3 N and 137.4 ± 9.5 N, respectively. Bite force was significantly improved after ALT-RAMEC protocol followed by facemask therapy in BCLP patients.
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Affiliation(s)
- Sadia Shabbir
- 66812Jinnah Medical and Dental College, Karachi, Pakistan
| | - Anam Sattar
- 66818Dow International Dental College/Dow University of Health Sciences (DUHS), Karachi, Pakistan
| | - Qurat Ul Ain Sami
- 66818Dow International Dental College/Dow University of Health Sciences (DUHS), Karachi, Pakistan
| | - Babar Zia
- 66812Jinnah Medical and Dental College, Karachi, Pakistan
| | - Hana Pervez
- 66812Jinnah Medical and Dental College, Karachi, Pakistan
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Dinsdale A, Costin B, Dharamdasani S, Page R, Purs N, Treleaven J. What conservative interventions improve bite function in those with temporomandibular disorders? A systematic review using self-reported and physical measures. J Oral Rehabil 2022; 49:456-475. [PMID: 35108410 DOI: 10.1111/joor.13307] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 01/02/2022] [Accepted: 01/17/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Bite is an important function of the human stomatognathic system. Despite this, it is commonly impaired in temporomandibular disorder (TMD) populations. The aim of this review is to evaluate the effectiveness of conservative interventions on self-reported and physical measures of bite function in individuals with TMD. METHODS This review was performed in compliance with PRISMA guidelines. An electronic search was performed on databases including Pubmed, CINAHL, Embase, and Cochrane Central. Inclusion criteria were journal articles evaluating the effect of any non-pharmacological conservative interventions on bite function in participants diagnosed with TMD. Risk of bias for individual studies was assessed using the Cochrane risk-of-bias v2 tool, and the NIH NHLBI pre-post tool. Data was synthesised based on outcome measures of bite function, and the quality of evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation approach. RESULTS Eleven studies were eligible for this review. Interventions included splinting, photobiomodulation, needling, exercise, manual therapy, and patient education; which were evaluated using mastication-related pain, self-reported chewing difficulty, and bite force/endurance outcome measures. Findings suggested manual therapy, needling, oral splinting, exercise and PBM interventions may improve bite function in TMD, although confidence in cumulative evidence ranged from moderate to very low. There was no evidence that patient education improved bite function. CONCLUSION Conservative interventions may be helpful to address bite-related impairments associated with TMD, although further research is needed to improve the quality of evidence and direct clinical guidelines.
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Affiliation(s)
- Alana Dinsdale
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Brianna Costin
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Simran Dharamdasani
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Ruth Page
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Nykeela Purs
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Julia Treleaven
- School of Health and Rehabilitation Sciences, University of Queensland, St Lucia, QLD, 4072, Australia
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Iwasaki M, Maeda I, Kokubo Y, Tanaka Y, Ueno T, Takahashi W, Watanabe Y, Hirano H. Capacitive-Type Pressure-Mapping Sensor for Measuring Bite Force. Int J Environ Res Public Health 2022; 19:ijerph19031273. [PMID: 35162299 PMCID: PMC8834865 DOI: 10.3390/ijerph19031273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/17/2022] [Accepted: 01/21/2022] [Indexed: 12/03/2022]
Abstract
Bite force is an important indicator of masticatory performance. However, existing methods for measuring bite force are either ineffective or expensive. Hence, we developed a novel capacitive-type pressure-mapping sensor that converts mechanical forces into changes in capacitance and calculates bite force. A portable device was fabricated based on this sensor sheet, and the accuracy of the bite-force measurements provided by the device was evaluated. The sensor has a thickness of 1.6 mm and has 63 measurement points. It was inserted into a dental model, where the output value was measured and compared with that of a universal testing machine (AG-IS 100 kN). A regression equation to estimate the bite force was obtained based on the relationship between the output of the capacitive-type pressure-mapping sensor and that of the load cell of the universal testing machine. The estimated bite force from the sensor and the quadratic regression equation closely resembled the known load applied by the compression tester (R2 = 0.992). We therefore conclude that the developed sensor can measure bite force accurately and effectively. A device with a built-in capacitive-type pressure-mapping sensor can potentially be a user-friendly tool for bite-force measurements in both clinical and epidemiological settings.
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Affiliation(s)
- Masanori Iwasaki
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (M.I.); (W.T.); (Y.W.); (H.H.)
| | - Ichinosuke Maeda
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi 485-0041, Japan; (I.M.); (Y.T.); (T.U.)
| | - Yota Kokubo
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi 485-0041, Japan; (I.M.); (Y.T.); (T.U.)
- Correspondence:
| | - Yoshitomo Tanaka
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi 485-0041, Japan; (I.M.); (Y.T.); (T.U.)
| | - Tetsuji Ueno
- Sumitomo Riko Co., Ltd., 3-1 Higashi, Komaki-shi 485-0041, Japan; (I.M.); (Y.T.); (T.U.)
| | - Wataru Takahashi
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (M.I.); (W.T.); (Y.W.); (H.H.)
| | - Yutaka Watanabe
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (M.I.); (W.T.); (Y.W.); (H.H.)
- Gerontology, Department of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Kita 14-Jo Nishi 5-Chome, Kita-ku, Sapporo-shi 060-8586, Japan
| | - Hirohiko Hirano
- Tokyo Metropolitan Geriatric Medical Center, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173-0015, Japan; (M.I.); (W.T.); (Y.W.); (H.H.)
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Gao J, Liu L, Su Z, Wang H. Sandwich Integration Technique for the Pressure Sensor Detection of Occlusal Force In Vitro. Sensors (Basel) 2021; 22:220. [PMID: 35009761 DOI: 10.3390/s22010220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 01/21/2023]
Abstract
Bite force measurement is an important parameter when checking the function and integrity of the masticatory system, whereas it is currently very difficult to measure bite force during functional movement. Hence, the purpose of this study is to explore the potential technique and device for the measurement and intervention of the continuous bite forces on functional and dynamic occlusal condition. A portable biosensor by sandwich technique was designed, and the validity, reliability, and sensitivity were determined by mechanical pressure loading tests; meanwhile, the pressure signal is acquired by, and transmitted to, voltage changes by the electrical measurements of the sensors. The result is that, when the mechanical stress detection device is thicker than 3.5 mm, it shows relatively ideal mechanical properties; however, when the thickness is less than 3.0 mm, there is a risk of cracking. Mechanical stress changing and voltage variation had a regularity and positive relationship in this study. The mechanical stress-measuring device made by medical and industrial cross has a good application prospect for the measurement of bite force during function.
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Aoki R, Takaba M, Abe Y, Nakazato Y, Ohara H, Maejima K, Baba K. A pilot study to test the validity of a piezoelectric intra-splint force detector for monitoring of sleep bruxism in comparison to portable polysomnography. J Oral Sci 2021; 64:63-68. [PMID: 34955491 DOI: 10.2334/josnusd.21-0421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
PURPOSE To test the validity of a force-based detection system (ISFD: intra-splint force detector) to record sleep bruxism (SB) in comparison to portable polysomnography (PSG). METHODS Simultaneous portable PSG recordings with a masseter electromyography (EMG) channel and ISFD with a deformation-sensitive piezoelectric film were performed on six participants with definite SB. First, simulated bruxism behaviors (static clenching, grinding, tapping, and rhythmic clenching) were recorded using both EMG and ISFD. Using these data, interval and duration criteria for ISFD data conditioning were established. Then, portable PSG recordings were conducted with the ISFD during sleep. Using the above criteria, ISFD events were compared with EMG-based SB episodes (the gold standard), and the sensitivity and positive predictive value of ISFD events were calculated. Spearman's correlation coefficients between true-positive ISFD events and SB episodes were then calculated. RESULTS Among the tested conditioning criteria, a 3-s interval combined with a 1-s duration was selected. The median sensitivity and positive predictive value for the ISFD were 0.861 and 0.585, respectively. The duration of true-positive ISFD events was correlated with that of EMG-based SB episodes (rho = 0.658, P < 0.01). CONCLUSION ISFD has validity for SB detection and could be an alternative to single-channel EMG-based recordings.
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Affiliation(s)
- Risa Aoki
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Masayuki Takaba
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Yuka Abe
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Yukari Nakazato
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Hironobu Ohara
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Kohei Maejima
- Department of Prosthodontics, School of Dentistry, Showa University
| | - Kazuyoshi Baba
- Department of Prosthodontics, School of Dentistry, Showa University
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Lee HS, Ko KH, Huh YH, Cho LR, Park CJ. Correlation between occlusal contact area at various levels of interocclusal thicknesses and masticatory performance. J Oral Rehabil 2021; 49:522-528. [PMID: 34888906 DOI: 10.1111/joor.13292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 11/17/2021] [Accepted: 12/03/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND This study aimed to determine the correlation between occlusal contact area and masticatory performance using BiteEye® , a photo occlusal analysis device and the multiple sieve method. OBJECTIVES To calculate the occlusal contact area at various levels of interocclusal thicknesses and to measure masticatory performance with peanuts as the test material. METHODS Fifty-two adults (30 men and 22 women) were enrolled according to specific exclusion/inclusion criteria. The occlusal contact area was measured by obtaining the interocclusal record of the maximum intercuspal position (MIP) using silicone impression material. Occlusal contact area measurements were performed in the ranges of 0-149, 0-89, 0-59, 0-29 and 0-9 μm. Masticatory performance was measured by obtaining the median particle size (X 50 ) after converting the weight of comminuted peanuts into size using the multiple sieve method. Statistical analysis was performed at 95% significance level. RESULTS Interocclusal thickness comparison revealed the highest correlation with X 50 in the 0-149 μm range. Stronger correlations between the occlusal contact area and X 50 were observed in cases of 20 strokes of mastication (r = -.451) than in cases of 10 strokes (r = -.383), in the posterior occlusal contact area (r = -.456) than in the full arch occlusal contact area (r = -.451) and the molar area (r = -.478) than in the premolar area (r = -.296). CONCLUSIONS The larger the occlusal contact area, the higher the masticatory performance; this correlation was statistically significant. Regarding interocclusal thickness, the highest correlation between the occlusal contact area and masticatory performance was observed in the 0-149 μm range. CLINICAL TRIAL REGISTRATION NUMBER GWNUDH IRB 2020-A001.
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Affiliation(s)
- Hye-Seon Lee
- Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
| | - Kyung-Ho Ko
- Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
| | - Yoon-Hyuk Huh
- Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
| | - Lee-Ra Cho
- Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
| | - Chan-Jin Park
- Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University, Gangneung, Korea
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Abstract
The aim of the current systematic review was to summarize and to evaluate the available information on the effectiveness of oral exercise in improving the masticatory function of people ≥18 y. Electronic databases (Medline, Embase, CENTRAL) and gray literatures were searched (up to December 2020) for relevant randomized and nonrandomized controlled clinical trials. Two reviewers independently conducted the study selection, data extraction, and quality assessments. Meta-analysis was conducted for the comparison of bite force and masticatory performance using mean difference (MD) and standardized mean difference (SMD), respectively. GRADE (Grading of Recommendations Assessment, Development, and Evaluation) assessment was adopted for collective grading of the overall body of evidence. Of the 1,576 records identified, 18 studies (21 articles) were included in the analysis. Results of meta-analysis indicated that oral exercise could significantly improve the mean bite force of the participants (parallel comparison: MD, 41.2; 95% CI, 11.6-70.7, P = 0.006; longitudinal comparison: MD, 126.5; 95% CI, 105.2-144.9, P < 0.001). However, the improvement in masticatory performance was not significant (parallel comparison: SMD, 0.11; 95% CI, -0.20 to 0.42, P = 0.48; longitudinal comparison: SMD, 0.4; 95% CI, -0.11 to 0.91, P = 0.13). Results of meta-regression showed that greater improvements in bite force can be achieved among younger adults and with more intensive exercise. Chewing exercise is the most effective oral exercise, followed by clenching exercise, while simple oral exercise may not have a significant effect. Based on the results of the meta-analysis and GRADE assessment, a weak recommendation for people with declined masticatory function to practice oral exercise is made.
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Affiliation(s)
- X Shu
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - S He
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - E C M Lo
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
| | - K C M Leung
- Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong, China
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Aramburú JS, Gehrke SA, Dedavid BA, Treichel TLE, Pippi NL. Correlation of Fracture Resistance of Dental Implants and Bite Force in Dogs described in the literature: An In Vitro Study. J Vet Dent 2021; 38:75-80. [PMID: 34736337 DOI: 10.1177/08987564211044940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Dental implants are not routinely used for rehabilitation in veterinary dentistry. For some veterinarians, further studies are necessary to be considered for clinical use in animals. The objective of the present in vitro study was to evaluate static fatigue of dental implants and to correlate that with the bite strength of dogs described in the literature. Sixty implants and abutments were used with the smallest diameter of each brand of implant utilized in the study. Three groups (n = 20) were created on the basis of the implant diameter, all with external hex connector: 3.30 mm (group 1), 4.0 mm (group 2) and 5.0 mm (group 3). All groups were subjected to quasi-static loading at 30° to the implant's long axis in a universal machine (model AME-5 kN). The mean fracture strength for group 1 was 964 ± 187 N, for group 2 was 1618 ± 149 N and for group 3 was 2595 ± 161 N. Significant differences between the groups with respect to resistance after the load applications were observed (P < .05). The diameter of implants affects the resistance to external forces during the application of non-axial strength (off-axis loading) and must be considered during the planning of rehabilitation to avoid problems.
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Affiliation(s)
- Jaime Sarda Aramburú
- 28118Universidade Federal de Santa Maria, Rio Grande do Sul, Brazil.,Biotecnos, Montevideo, Uruguay
| | | | | | | | - Ney Luis Pippi
- 28118Universidade Federal de Santa Maria, Rio Grande do Sul, Brazil
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Vozza I, Manzon L, Passarelli PC, Pranno N, Poli O, Grippaudo C. The Effects of Wearing a Removable-Partial-Denture on the Bite Forces: A Cross-Sectional Study. Int J Environ Res Public Health 2021; 18:ijerph182111401. [PMID: 34769912 PMCID: PMC8583365 DOI: 10.3390/ijerph182111401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/25/2021] [Accepted: 10/28/2021] [Indexed: 11/26/2022]
Abstract
Background: Removable partial dentures are a frequently used prosthetic treatment in the elderly population, but different types or RPDs might guarantee different chewing capabilities. In many studies, the relationship between chewing and aging has been reported and it has been shown that efficient chewing can improve the overall quality of life. Objectives: In the present study, the relationship between maximum bite force (MBF) and RPDs was studied. A relationship between the body mass index (BMI) and the type of prosthesis was also analyzed. Methods: 240 elderly patients, 120 males and 120 females, with bilateral posterior edentulism (class 1 of Kennedy classification) who had been wearing an RPD for at least a year, were recruited. Patients were divided into two groups: Group 1: male (n = 60) and female (n = 60) patients with bilateral edentulous areas located posterior to the remaining natural teeth and natural teeth in the opposite dental arch. Group 2: male (n = 60) and female (n = 60) patients with maxillary and mandibular bilateral edentulous areas located posterior to the remaining natural teeth. Their Body Mass Index (BMI) and Maximum bite force (MBF) were measured and compared according to the material and design of their RPD. Results: In both Groups, patients wearing cobalt-chrome alloy RPDs (Co-Cr-RPD) (Group 1: 20.25 ± 6.7 MBF, p < 0.001; Group 2: 16.0 ± 5.7 MBF, p < 0.001) had an increased MBF when compared to polymethylmethacrylate RPD (PMMA-RPD) (Group 1: 12.9 ± 3.36 MBF; Group 2: 10.4 + 2.8 MBF), and Valplast RPD (V-RPD) (Group 1: 14.3 ± 4.7 MBF; Group 2: 11.3 ± 3.4 MBF) users. There were no significant differences in bite force between patients wearing PMMA-RPD and V- RPD in both Groups. Patients in Group 2 showed a lower MBF than those in Group 1 (Group 1: 16.05 ± 6.13 MBF; Group 2: 12.6 ± 4.84 MBF; p < 0.001). Conclusions: A reduction in chewing force can lead to choosing softer foods for nutrition, which can lead to an increase in BMI. Our results show that only CoCr-RPD wearers were able to chew consistent food, whereas PMMA- RPD and V-RPD, due to the properties of the materials, their instability, and the possibility of causing pain during mastication, determined a limitation in the choice of food for many of the participants.
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Affiliation(s)
- Iole Vozza
- Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00168 Rome, Italy; (L.M.); (N.P.); (O.P.)
- Correspondence: ; Tel.: +39-0649976612 or +39-0649976649
| | - Licia Manzon
- Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00168 Rome, Italy; (L.M.); (N.P.); (O.P.)
| | - Pier Carmine Passarelli
- Department of Head and Neck, Division of Oral Surgery and Implantology, Catholic University of the Sacred Heart, Fondazione Policlinico Gemelli IRCCS, 00168 Rome, Italy; (P.C.P.); (C.G.)
| | - Nicola Pranno
- Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00168 Rome, Italy; (L.M.); (N.P.); (O.P.)
| | - Ottavia Poli
- Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00168 Rome, Italy; (L.M.); (N.P.); (O.P.)
| | - Cristina Grippaudo
- Department of Head and Neck, Division of Oral Surgery and Implantology, Catholic University of the Sacred Heart, Fondazione Policlinico Gemelli IRCCS, 00168 Rome, Italy; (P.C.P.); (C.G.)
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