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Lin J, Cao DY. Associations Between Temporomandibular Disorders and Brain Imaging-Derived Phenotypes. Int Dent J 2024:S0020-6539(24)00035-2. [PMID: 38365503 DOI: 10.1016/j.identj.2024.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 12/29/2023] [Accepted: 01/14/2024] [Indexed: 02/18/2024] Open
Abstract
OBJECTIVE Temporomandibular disorders (TMD) affect the temporomandibular joint and associated structures. Despite its prevalence and impact on quality of life, the underlying mechanisms of TMD remain unclear. Magnetic resonance imaging studies suggest brain abnormalities in patients with TMD. However, these lines of evidence are essentially observational and cannot infer a causal relationship. This study employs Mendelian randomisation (MR) to probe causal relationships between TMD and brain changes. METHODS Genome-wide association study (GWAS) summary statistics for TMD were collected, along with brain imaging-derived phenotypes (IDPs). Instrumental variables were selected from the GWAS summary statistics and used in bidirectional 2-sample MR analyses. The inverse-variance weighted analysis was chosen as the primary method. In addition, false discovery rate (FDR) correction of P value was used. RESULTS Eleven IDPs related to brain imaging alterations showed significant causal associations with TMD (P-FDR < .05), validated through sensitivity analysis. In forward MR, the mean thickness of left caudal middle frontal gyrus (OR, 0.76; 95% CI, 0.67-0.87; P-FDR = 1.15 × 10-2) and the volume of right superior frontal gyrus (OR, 1.24; 95% CI, 1.10-1.39; P-FDR = 2.26 × 10-2) exerted significant causal effects on TMD. In the reverse MR analysis, TMD exerted a significant causal effect on 9 IDPs, including the mean thickness of the left medial orbitofrontal cortex (β = -0.10; 95% CI, -0.13 to -0.08; P-FDR = 2.06 × 10-11), the volume of the left magnocellular nucleus (β = -0.15; 95% CI, -0.22 to -0.09; P-FDR = 3.26 × 10-4), the mean intensity of the right inferior-lateral ventricle (β = -0.09; 95% CI, -0.14 to -0.04; P-FDR = 2.23 × 10-2), the volume of grey matter in the anterior division of the left superior temporal gyrus (β = 0.09; 95% CI, 0.04-0.14; P-FDR = 1.69 × 10-2), and so forth. CONCLUSIONS This study provides genetic evidence supporting the bidirectional causal associations between TMD and brain IDPs, shedding light on potential neurobiological mechanisms underlying TMD development and its relationship with brain structure.
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Affiliation(s)
- Jun Lin
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Testing Center of Stomatology, Xi'an Jiaotong University College of Stomatology, Xi'an, Shaanxi, China
| | - Dong-Yuan Cao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Testing Center of Stomatology, Xi'an Jiaotong University College of Stomatology, Xi'an, Shaanxi, China.
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Costa ALF, Castilho Fardim KA, de Almeida BM, Gomes JPP, Braz-Silva PH, Dieguez FL, Cardoso CDAB, Araki AT, de Castro Lopes SLP. Eccentric movements of temporomandibular joint and upper airway volume: Three-dimensional segmentation using cone beam computed tomography. Cranio 2024; 42:10-17. [PMID: 33719936 DOI: 10.1080/08869634.2021.1894860] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE The purpose of the present investigation was to assess whether possible changes in the dynamic movements of the TMJ might cause a greater variation between the volumes of the upper airways in open- and closed-mouth positions. METHODS CBCT scans of 92 subjects were used to assess the TMJ bilaterally. All scans were acquired in closed (CM) and maximum mouth opening (MMO) positions. The difference in the volume of the oropharyngeal cavity obtained by subtracting the CM volume from the MMO volume (delta volume or volume variation) was calculated. The resulting volume was analyzed by Mann-Whitney test for variation in rotation. RESULTS A significant difference was found (p-value = 0.0188) on the right side regarding changes in the rotational movement of the condyle (Mann-Whitney test). CONCLUSION This study showed a relationship between degree of abnormal or limited rotation and variation in the upper airway volume on one side.
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Affiliation(s)
| | - Karolina Aparecida Castilho Fardim
- Department of Diagnosis and Surgery, São José dos Campos Dental School, São Paulo State University (UNESP), São José dos Campos, SP, Brazil
| | - Bruna Maciel de Almeida
- Department of Diagnosis and Surgery, São José dos Campos Dental School, São Paulo State University (UNESP), São José dos Campos, SP, Brazil
| | - João Pedro Perez Gomes
- Department of Stomatology, School of Dentistry, University of São Paulo, Sao Paulo, Brazil
| | | | - Flávia Limberg Dieguez
- Postgraduate Program in Dentistry, Cruzeiro do Sul University (UNICSUL), São Paulo, SP, Brazil
| | | | - Angela Toshie Araki
- Postgraduate Program in Dentistry, Cruzeiro do Sul University (UNICSUL), São Paulo, SP, Brazil
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Pumklin J, Sowithayasakul T, Thaweemonkongsap C, Saptasevee P, Sangprasert P. Effects of occlusal conditions on masseter and temporalis muscle activity: An electromyographic evaluation. Saudi Dent J 2023; 35:946-952. [PMID: 38107050 PMCID: PMC10724355 DOI: 10.1016/j.sdentj.2023.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 07/06/2023] [Accepted: 07/25/2023] [Indexed: 12/19/2023] Open
Abstract
Introduction Dental occlusion contributes to the development of temporomandibular disorder. Objective This case control study examined the influence of different occlusal conditions on the surface electromyography (sEMG) of the superficial part of the masseter muscle (MM) and anterior part of the temporalis muscle (TA) during clenching in the maximum intercuspal position (MIP). Materials and methods Twelve healthy subjects had their anterior, right posterior, or left posterior teeth added by composite resin to generate the bilateral posterior, unilateral left, or unilateral right posterior tooth losses, respectively. Muscle activity in the resting stage, MM's and TA's maximum voluntary clenching (MVC; µV) in MIP, each muscle activity's symmetry (%), and ipsilateral MM and TA synergy (%) were measured by sEMG. All parameters were analyzed by SPSS version 23.0, and the significance level was set at p < 0.05. Results The MM's and TA's sEMG activity at the resting stage significantly differed from those at the other occlusal conditions (p < 0.05). Both muscles' MVC were highest at the MIP during clenching but lowest during anterior clenching. During unilateral posterior clenching, such MVC was higher at the occluding than at the non-occluding sides. The TA's symmetry during clenching at the anterior and unilateral posterior teeth was lower than that at the MIP during clenching. No significant difference was seen in the ipsilateral MM and TA synergy. Conclusion Different occlusal conditions influenced the MM's and TA's sEMG activity. Each masticatory muscle responded differently to the same occlusal conditions.
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Affiliation(s)
- Jittima Pumklin
- Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
| | - Thanaporn Sowithayasakul
- Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand
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Santana-Penín U, Santana-Mora U, López-Solache A, Mora MJ, Collier T, Pocock SJ, Lorenzo-Franco F, Varela-Centelles P, López-Cedrún JL. Remodeling dental anatomy vs sham therapy for chronic temporomandibular disorders. A placebo-controlled randomized clinical trial. Ann Anat 2023; 250:152117. [PMID: 37302432 DOI: 10.1016/j.aanat.2023.152117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/08/2023] [Accepted: 05/20/2023] [Indexed: 06/13/2023]
Abstract
BACKGROUND Evidence regarding the etiology or effective treatments for chronic orofacial pain, the majority diagnosed as temporomandibular disorder (TMD), is limited. PURPOSE To investigate whether occlusal equilibration therapy (ET) and decreasing the (higher) angle of the lateral guidance on the nonworking-side leads to a reduction in chronic TMDs intensity. METHODS It was conducted a randomized, explanatory, single blind with blinded assessment, placebo-controlled trial with strong protection against bias involving patients with chronic TMDs. Participants were randomly assigned to receive equilibration therapy or sham therapy. ET in this study consisted of minimal invasive occlusal remodeling to obtain balanced occlusion with reduction of the steeper angle of lateral mandibular movement with respect to the Frankfort plane. The primary outcome was a change in the pain intensity score (on a 0-10 point scale, with 0 indicating no pain and 10 the worst possible pain) at month 6. Secondary outcomes include maximum unassisted mouth opening and psychological distress. RESULTS A total of 77 participants underwent randomization, 39 of whom received ET and 38 sham therapy. The trial was stopped early for efficacy, according to preestablished rules when 67 participants (n = 34, n = 33, respectively) had completed the analysis. At month 6, the mean unadjusted pain intensity score was 2.1 in the ET and 3.6 in the sham therapy group (adjusted mean difference, -1.54; 95% confidence interval [CI] -0.5 to -2.6; P = 0.004; ANCOVA model). The mean increase in maximum unassisted mouth opening (main secondary outcome) was significantly higher in the real therapy group (adjusted mean difference 3.1 mm, 95% CI 0.5-5.7, p = 0.02). CONCLUSION ET significantly reduced the intensity of facial pain associated with chronic TMDs and increased maximum unassisted mouth opening, as compared with sham therapy, over the course of 6 months. There were no serious adverse events. Funded by the Instituto de Salud Carlos III from the Ministry of Science and Innovation of the Government of Spain and European Regional Development Fund, Grant nº PI11/02507; "una manera de hacer Europa".
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Affiliation(s)
- Urbano Santana-Penín
- Department of Surgery and Medical-Surgical Specialties, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
| | - Urbano Santana-Mora
- Department of Surgery and Medical-Surgical Specialties, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - Alicia López-Solache
- Department of Surgery and Medical-Surgical Specialties, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - María Jesús Mora
- Department of Surgery and Medical-Surgical Specialties, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - Timothy Collier
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Stuart J Pocock
- Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | | | - Pablo Varela-Centelles
- Department of Surgery and Medical-Surgical Specialties, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, A Coruña, Spain
| | - José Luís López-Cedrún
- Oral and Maxillofacial Surgery Service, University Hospital of A Coruña, A Coruña, Spain
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Zhai X, Huang D, Hu Y, Li X, Wang J, Ma J, Li H, Hu M, Liu H, Jiang H. Cone-beam computed tomographic characteristics in degenerative temporomandibular joint disease patients with chewing side preference. Clin Oral Investig 2023; 27:2267-2276. [PMID: 37017756 DOI: 10.1007/s00784-023-04961-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 03/17/2023] [Indexed: 04/06/2023]
Abstract
OBJECTIVES This study is aimed at assessing the Cone-beam computed tomographic (CBCT) characteristics of temporomandibular joints (TMJ) in degenerative temporomandibular joint disease (DJD) patients with chewing side preference (CSP). MATERIALS AND METHODS CBCT images of 98 patients with DJD (67 with CSP and 31 without CSP) and 22 asymptomatic participants without DJD were measured retrospectively to compare the osteoarthritic changes and the morphology of TMJ. Quantitative analysis of the TMJ radiographic images was performed to present a comparison between the three inter-group groups and between the two sides of the joints. RESULTS The frequencies of the articular flattening and surface erosion occur more often in the preferred side joints of DJD patients with CSP than the contralateral side. In addition, the horizontal angle of condyle, the depth of glenoid fossa (DGF), and the inclination of articular eminence (IAE) were larger in DJD patients with CSP than that in asymptomatic participants (p<0.05). Also, the condylar anteroposterior dimension of preferred side joints was significantly less than that of non-preferred side (p=0.026), while the width of condyles (p=0.041) and IAE (p=0.045) was greater. CONCLUSIONS DJD patients with CSP appear to have a higher prevalence of osteoarthritic changes, with the morphological changes such as flat condyle, deep glenoid fossa, and steep articular eminence, which might be considered the characteristic imaging features. CLINICAL RELEVANCE This study found that CSP is a predisposing factor for the development of DJD, and attention should be paid to the existence of CSP in DJD patients during the clinical practice.
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Affiliation(s)
- Xiaoting Zhai
- Medical School of Chinese PLA, Beijing, China
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Dongzong Huang
- Medical School of Chinese PLA, Beijing, China
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Yifan Hu
- Medical School of Chinese PLA, Beijing, China
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Xiaoxing Li
- Medical School of Chinese PLA, Beijing, China
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Jiazhu Wang
- Department of Radiology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Junli Ma
- Department of Stomatology, General Hospital of Southern Theater of PLA, Guangzhou, China
| | - Hongbo Li
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Min Hu
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Hongchen Liu
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Hua Jiang
- Department of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China.
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Saczuk K, Lapinska B, Wawrzynkiewicz A, Witkowska A, Arbildo-Vega HI, Domarecka M, Lukomska-Szymanska M. Temporomandibular Disorders, Bruxism, Perceived Stress, and Coping Strategies among Medical University Students in Times of Social Isolation during Outbreak of COVID-19 Pandemic. Healthcare (Basel) 2022; 10:740. [PMID: 35455915 PMCID: PMC9028346 DOI: 10.3390/healthcare10040740] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/08/2022] [Accepted: 04/12/2022] [Indexed: 02/01/2023] Open
Abstract
The COVID-19 pandemic caught universities along with their students off-guard, enforcing online education. Fear of the unknown, disinformation, and isolation resulted in an increased stress level in the entire population. Medical university students are particularly endangered with high stress levels and developing TMD. Temporomandibular disorders (TMD) are of multifactorial etiology, and manifest with jaw dysfunction, masticatory muscle tension or pain, as well as headache. Though bruxism can act as an exacerbating factor for TMD, stress can also play crucial role in the onset. The study aimed to measure occurrence of TMD and bruxism symptoms in the medical student population, asses the stress level, and evaluate adopted stress-coping strategies during the COVID-19 pandemic outbreak. A survey study was performed among 1018 students at Medical University of Lodz during April 2020. A self-designed questionnaire for screening TMD and bruxism symptoms, Perceived Stress Scale (PSS-10), and Brief-COPE questionnaires were applied. TMD and bruxism symptoms were observed in the majority of subjects during social isolation. The perceived stress levels were significantly higher in those experiencing TMD and bruxism symptoms. Mostly maladaptive, emotion-focused coping strategies were chosen by study subjects experiencing high levels of stress. Choosing Self-Blaming as a coping strategy is the strongest predictor of perceived stress.
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Affiliation(s)
- Klara Saczuk
- Department of General Dentistry, Medical University of Lodz, 92-213 Lodz, Poland; (K.S.); (B.L.); (M.D.)
| | - Barbara Lapinska
- Department of General Dentistry, Medical University of Lodz, 92-213 Lodz, Poland; (K.S.); (B.L.); (M.D.)
| | - Adam Wawrzynkiewicz
- Department of Clinical Chemistry and Biochemistry, Medical University of Lodz, 90-419 Lodz, Poland;
| | | | - Heber Isac Arbildo-Vega
- Department of General Dentistry, Dentistry School, Universidad San Martín de Porres, Chiclayo 14012, Peru;
- Department of Human Medicine, Human Medicine School, Universidad San Martín de Porres, Chiclayo 14012, Peru
- Department of General Dentistry, Dentistry School, Universidad Particular de Chiclayo, Chiclayo 14012, Peru
- Department of Stomatology, School of Stomatology, Universidad Alas Peruanas, Lima 15072, Peru
| | - Monika Domarecka
- Department of General Dentistry, Medical University of Lodz, 92-213 Lodz, Poland; (K.S.); (B.L.); (M.D.)
| | - Monika Lukomska-Szymanska
- Department of General Dentistry, Medical University of Lodz, 92-213 Lodz, Poland; (K.S.); (B.L.); (M.D.)
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Liu Z, Hou Y, Zhang P, Lu H, Wang W, Ma W. Changes of the condylar cartilage and subchondral bone in the temporomandibular joints of rats under unilateral mastication and expression of Insulin-like Growth Factor-1. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2021; 123:405-416. [PMID: 34601167 DOI: 10.1016/j.jormas.2021.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/27/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVES This study aimed to define changes in the rat condylar cartilage and subchondral bone using the unilateral mastication model. MATERIALS AND METHODS In this study, forty 4-week-old Wistar rats were randomly divided into experimental (n = 20) and control group (n = 20). In the experimental group, unilateral dental splints were placed on the occlusal surface of left maxillary molars. The rats were sacrificed at 1, 2, 3, and 4 weeks after placement of the splint. Micro-CT scanning and histological staining were performed to observe the changes in the mandibular condylar cartilage and subchondral bone. Levels of insulin-like growth factor-1 (IGF-1) were determined via immunohistochemistry to analyse the occurrence of osteogenic changes. RESULTS Micro-CT scanning findings demonstrated the occurrence of asymmetric growth of condyle in the experimental group. The condylar cartilage and subchondral bone exhibited degradation on the chewing side of the experimental group and showed decreased bone mineral density, thinner cartilage thickness, and increased degree of degeneration and osteoclast activity. Compared with the control group, the expression of IGF-1 was remarkably higher on the non-chewing side. CONCLUSION Long-term unilateral mastication can lead to the occurrence of degenerative changes in the condylar cartilage and subchondral bone during growth and development. IGF-1 may play a role in promoting the process of osteogenesis.
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Affiliation(s)
- Ziyang Liu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China
| | - Yali Hou
- Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Department of Oral Pathology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China
| | - Pengfei Zhang
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China.
| | - Haiyan Lu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China
| | - Wen Wang
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China.
| | - Wensheng Ma
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China; Hebei Clinical Research Center for Oral Diseases, School and Hospital of Stomatology, Hebei Medical University, Shijiazhuang, 050017, PR China.
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Oki K, Ogino Y, Tsukiyama Y, Yamasaki Y, Koyano K. The impacts of prosthetic interventions on mastication predominance in Kennedy Class Ⅱ patients. J Prosthodont Res 2021; 65:327-331. [PMID: 33390408 DOI: 10.2186/jpr.jpr_d_20_00055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Purpose The purpose of this study was to investigate the effects of prosthetic interventions in patients with Kennedy Class Ⅱ (unilateral missing posterior teeth) on mastication predominance.Methods The subjects comprised patients with Kennedy Class II and healthy dentate volunteers (HD group). The subjects were asked to freely chew the test foods (chewing gum, beef jerky, and peanuts). Electromyographic activity of the bilateral masseter muscles was recorded twice (before and after prosthetic intervention). The chewing side (right or left) was judged by the level of the root mean square electromyographic amplitude. Mastication predominance was assessed using the mastication predominance index (MPI; range 0-100%). Each patient was restored with a removable partial denture (RPD) or an implant-supported fixed prosthesis (IFP). The effects of prosthetic interventions were statistically evaluated by the differences between MPI before and after prosthetic interventions (pre-MPI and post-MPI , respectively).Results There was a significant difference between pre-MPI of patients with Kennedy Class II and MPI of the HD group (HD-MPI) for all test foods (P < 0.0001). Statistical analysis also demonstrated a significant difference between pre-MPI and post-MPI measured with each of the three food items in both the RPD and IFP groups (P < 0.0001). Multiple comparisons revealed that post-MPI in the IFP group, but not in the RPD group, was statistically comparable with HD-MPI, although there were no significant differences among the three groups when MPIs were calculated using peanuts.Conclusions Prosthetic interventions improved mastication predominance in patients with Kennedy Class Ⅱ patients. Depending on the food type, IFP might contribute to better improvement of mastication predominance than RPD depending on food.
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Affiliation(s)
- Kyosuke Oki
- Section of Fixed Proshodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yoichiro Ogino
- Section of Fixed Proshodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yoshihiro Tsukiyama
- Section of Dental Education, Division of Oral Biological Sciences, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Yo Yamasaki
- Section of Implant and Rehabilitative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Kiyoshi Koyano
- Section of Fixed Proshodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.,Section of Implant and Rehabilitative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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Nguyen MS, Saag M, Jagomägi T, Nguyen QH, Voog-Oras Ü. The impact of occlusal support on temporomandibular disorders: a literature review. PROCEEDINGS OF SINGAPORE HEALTHCARE 2021. [DOI: 10.1177/20101058211023779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Temporomandibular disorders are a multifactorial disease. Occlusal support and the number of teeth in dentition have significant effects on the masticatory system. The current study aims to review the role of occlusal support in association with findings of temporomandibular disorders. Data sources were PubMed, Web of Science and Google Scholar, with 1411 citations published over the period 1992–2019. The selection criteria stipulated that articles must have reported the association between the number of teeth, occlusal unit, occlusal support and temporomandibular disorders. A total of 15 full-text articles was finally accessed for eligibility in the current review. The studies on temporomandibular disorders were collected from various sources, including articles reporting temporomandibular disorder symptoms ( n=1), temporomandibular disorder signs ( n=5), temporomandibular joint osseous changes ( n=1), temporomandibular joint dysfunction using the Helkimo index ( n=2), and temporomandibular disorder classification ( n=6). Of these articles, significant associations were found between: the number of missing teeth and temporomandibular disorders ( n=5); the number of occlusal units and occlusal supports and temporomandibular disorders ( n=3); the position of the lost occlusal units and temporomandibular disorders ( n=1). Loss of the occlusal unit has more impact on temporomandibular disorders than the loss of posterior teeth. The total loss of unilateral occlusal support seems to be an aetiological factor for temporomandibular disorders, and maintenance of balanced posterior occlusal support has a role in the prevention and management of temporomandibular disorders.
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Affiliation(s)
- Minh Son Nguyen
- Faculty of Dentistry, Danang University of Medical Technology and Pharmacy, Vietnam
| | - Mare Saag
- Institute of Dentistry, University of Tartu, Estonia
| | | | - Quang Hai Nguyen
- Department of Surgery – Anesthesia and Resuscitation, Danang Hospital of Odonto-Stomatology, Vietnam
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Santana-Mora U, López-Cedrún J, Suárez-Quintanilla J, Varela-Centelles P, Mora MJ, Da Silva JL, Figueiredo-Costa F, Santana-Penín U. Asymmetry of dental or joint anatomy or impaired chewing function contribute to chronic temporomandibular joint disorders. Ann Anat 2021; 238:151793. [PMID: 34186201 DOI: 10.1016/j.aanat.2021.151793] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The etiologies of most chronic temporomandibular joint disorders are unknown. However, an association between habitual chewing on a particular side and chronic temporomandibular joint disorders has been reported. The aim of this study was to investigate the differences between sides (affected vs unaffected) of biodynamic factors (including lateral dental guidance determined by dental anatomy) or condylar path angles (determined by temporomandibular joint morphology) and chewing function (physiological alternate chewing vs single habitual chewing side). The study scope was to investigate possible etiological factors to improve the understanding of temporomandibular joint disorders. The null hypothesis was that no difference would be found between sides that are or are not affected by chronic temporomandibular joint disorders in chewing function or in levels of dental or temporomandibular joint remodeling. METHODS This cross-sectional, double-blind study involved 24 adults with substantial, chronic, unilateral symptoms diagnosed as temporomandibular joint disorders. Chewing function, temporomandibular joint remodeling (using axiography) and dental anatomy (lateral guidance angles using kinesiography) were assessed. RESULTS Habitual chewing on one particular side was observed in 17 of 24 participants; significantly more (n=15) chewed on the affected side than on the unaffected side (P=0.002 in a two-tailed Fisher's exact test; risk estimate=4.5; 95% CI 1.326-15.277). The condylar path (CP) angle was steeper on the affected side than on the unaffected side (mean (standard deviation)=50.52° (9.98°) versus 45.50° (7.98°); P=0.002 in a two-tailed t-test). The lateral guidance (LG) angles were flatter on the affected side in all 24 participants. CONCLUSION Our results suggest that habitual chewing on one side may be associated with increasing condylar path, with flattening lateral guidance angles, and also with chronic temporomandibular joint disorder on the habitual chewing side.
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Affiliation(s)
- Urbano Santana-Mora
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain.
| | - José López-Cedrún
- Oral and Maxillofacial Surgery Service,University Hospital of La Coruña, La Coruña, Spain.
| | - Juán Suárez-Quintanilla
- Department of Morphological Sciences, Faculty of Medicine and Odontology, University of Santiago de Compostela, Santiago de Compostela, Spain.
| | - Pablo Varela-Centelles
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
| | - María Jesús Mora
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
| | - José Luís Da Silva
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain.
| | - Fernanda Figueiredo-Costa
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain.
| | - Urbano Santana-Penín
- Department of Surgery, University of Santiago de Compostela, Santiago de Compostela, La Coruña, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
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Pihlaja K, Vuollo V, Sidlauskas M, Harila V, Sidlauskas A, Salomskiene L, Heikkinen T. Relations of laterality and chewing sidedness in twins. Eur J Orthod 2019; 41:244-249. [PMID: 29982485 DOI: 10.1093/ejo/cjy050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVES To study, whether there are associations between chewing side preference and other lateralities, whether there is a genetic origin for preferred chewing side (PCS), relations to sex, birth order and orthodontic treatment. MATERIALS AND METHODS The study included 113 twin pairs, 57 pairs monozygotic, 47 pairs same sex dizygotic and 9 pairs of opposite sex. The lateralities of preferred chewing side, footedness and eyedness were assessed by functional tests and handedness was checked by asking. RESULTS Right-handed, -footed and -eyed as separated groups, and true-right sided (combined), were evenly distributed by preferred chewing side. By contrast, left-handed, -footed, -eyed and non-right sided used more left or both sides when chewing. Birth order affected preferred chewing side among monozygotic: the first-born twin was more likely to have the preferred chewing side on the non-right, whereas second-born twins used right side. Gender, zygosity and orthodontic treatment were not statistically significant factors. LIMITATIONS Examination of chewing sidedness could have been done in several different ways to provide a definite result. Sample size of opposite sex twins was very small. CONCLUSIONS Preferred chewing side generally seemed to follow the side where other lateralities occur; however, monozygotic twins seemed to be more receptive to it. True-right sided were more evenly distributed than non-right sided by the preferred chewing side.
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Affiliation(s)
- Kirsi Pihlaja
- Unit of Oral Health Sciences, Department of Orthodontics, University of Oulu, Oulu, Finland
| | - Ville Vuollo
- Unit of Oral Health Sciences, Department of Orthodontics, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
| | - Mantas Sidlauskas
- Clinic of Orthodontics, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Virpi Harila
- Unit of Oral Health Sciences, Department of Orthodontics, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
| | - Antanas Sidlauskas
- Clinic of Orthodontics, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Loreta Salomskiene
- Institute of Biology Systems and Genetics, Veterinary Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Tuomo Heikkinen
- Unit of Oral Health Sciences, Department of Orthodontics, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
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Haralur SB, Majeed MI, Chaturvedi S, Alqahtani NM, Alfarsi M. Association between preferred chewing side and dynamic occlusal parameters. J Int Med Res 2019; 47:1908-1915. [PMID: 30764682 PMCID: PMC6567747 DOI: 10.1177/0300060519827165] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Objectives Evaluation of dynamic occlusal parameters can help dentists to understand the association of occlusion with the preferred chewing side (PCS) and enable optimal restoration of masticatory efficiency. This study evaluated the association between PCS and dynamic occlusal parameters. Methods One hundred participants (50 each, right and left PCS) were included in this study. PCS was determined by the visual spot-checking method, and occlusal analysis was conducted by T Scan. Occlusal parameters evaluated included initial contact, center of force, tooth contact area, occlusal interferences, and occlusal time. Data were assessed by chi-squared test and eta correlation coefficient. Results Initial contact towards the PCS was observed in 68% and 70% of right and left unilateral chewers, respectively. Likewise, center of force towards the PCS was present in 72% and 66% of right and left unilateral chewers, respectively. A larger area of tooth contact was predominant towards the PCS in 70% and 72% of right and left unilateral chewers, respectively. Chi-squared analysis showed a strong positive correlation between PCS and occlusal parameters at maximum intercuspation. Eta correlation coefficients between PCS and occlusal interferences, as well as centric and eccentric occlusion, revealed negligible associations. Conclusion Dynamic occlusal parameters may be associated with PCS.
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Affiliation(s)
- Satheesh B Haralur
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Muhammad Irfan Majeed
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Saurabh Chaturvedi
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Nasser M Alqahtani
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Mohammed Alfarsi
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi Arabia
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Almashraqi AA, Ahmed EA, Mohamed NS, Halboub ES. An MRI evaluation of the effects of qat chewing habit on the temporomandibular joint. Oral Surg Oral Med Oral Pathol Oral Radiol 2018; 126:272-282.e2. [DOI: 10.1016/j.oooo.2018.05.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/29/2018] [Accepted: 05/11/2018] [Indexed: 02/07/2023]
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Rikmasari R, Yubiliana G, Maulina T. Risk Factors of Orofacial Pain: A Population-Based Study in West Java Province, Indonesia. Open Dent J 2017; 11:710-717. [PMID: 29399215 PMCID: PMC5759100 DOI: 10.2174/1874210601711010710] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 10/15/2017] [Accepted: 12/06/2017] [Indexed: 12/05/2022] Open
Abstract
Background: The management of orofacial pain in Indonesia has not been well performed, which consequently led to an increase in the orofacial pain occurrences and a decreased quality of life. One of the possible reasons for this particular matter is the lack of evaluation on the risk factors that might induce orofacial pain in some individuals. Objective: The objective of the current study was to evaluate the risk factors of orofacial pain on productive age population in West Java province, Indonesia. Methods: One thousand and fifty-six participants (522 males; 534 females) were recruited for the study. A questionnaire that consists of demographic questions and questions evaluating several assumed risk factors for orofacial pain was used in a single interview. All data was analyzed by using Chi Square test to test the significance, Odds Ratio (OR), as well as Relative Risk (RR) by using SPSS version 23 (IBM Statistic, USA). Results: The result of the current study revealed that bruxism (p<0.01), daytime clenching (p<0.01), and unilateral chewing (p<0.01) were significantly related to the occurrence of orofacial pain. It was also found that participants who performed multitude of heavy liftings at work have an increased risk (RR=1.19: 95% CI: 1.04 – 1.35) of having orofacial pain compared to those who do not. Conclusion: Risk factors for the occurrence of orofacial pain on productive age population in Indonesian sample consisted of oral parafunctional habits and non-parafunctional habits, such as heavy lifting. Further study in this particular topic is of importance.
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Affiliation(s)
- Rasmi Rikmasari
- Prosthodontic Department, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Gilang Yubiliana
- Community Dental Health Department, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Tantry Maulina
- Oral Surgery Department, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
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15
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Jaw biodynamic data for 24 patients with chronic unilateral temporomandibular disorder. Sci Data 2017; 4:170168. [PMID: 29112190 PMCID: PMC5674825 DOI: 10.1038/sdata.2017.168] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 09/26/2017] [Indexed: 12/03/2022] Open
Abstract
This study assessed 24 adult patients, suffering from severe chronic unilateral pain diagnosed as temporomandibular joint (TMJ) disorder (TMD). The full dentate patients had normal occlusion and had never received an occlusal therapy, i.e., were with natural dental evolution/maturation. The following functional and dynamic factors were assessed: (1) chewing function; (2) TMJ remodeling or the condylar path (CP); and (3) lateral jaw motion or lateral guidance (LG). CPs were assessed using conventional axiography, and LG was assessed by K7 jaw tracking. Seventeen (71%) of the 24 (100%) patients consistently showed a habitual chewing side. The mean (standard deviation [SD]) of the CP angles was 47.90 (9.24) degrees. The mean (SD) of the LG angles was 42.95 (11.78) degrees. Data collection emerged from the conception of a new TMD paradigm where the affected side could be the habitual chewing side, the side with flatter lateral jaw motion or the side with an increased CP angle. These data may lead to improved diagnosis, therapy plans and evolution in TMD patients.
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16
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Nayak UA, Sharma R, Kashyap N, Prajapati D, Kappadi D, Wadhwa S, Gandotra S, Yadav P. Association between Chewing Side Preference and Dental Caries among Deciduous, Mixed and Permanent Dentition. J Clin Diagn Res 2016; 10:ZC05-ZC08. [PMID: 27790569 DOI: 10.7860/jcdr/2016/20620.8422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 07/18/2016] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Chewing Side Preference (CSP) is said to occur when mastication is recognized exclusively/consistently or predominantly on the same side of the jaw. It can be assessed by using the direct method - visual observation and indirect methods by electric programs, such as cinematography, kinetography and computerized electromyography. AIM The present study was aimed at evaluating the prevalence of CSP in deciduous, mixed and permanent dentitions and relating its association with dental caries. MATERIALS AND METHODS In a cross-sectional observational study, 240 school going children aged 3 to 18years were randomly allocated to three experimental groups according to the deciduous dentition, mixed dentition and permanent dentition period. The existence of a CSP was determined using a direct method by asking the children to chew on a piece of gum (trident sugarless). The Mann Whitney U-test was used to compare the CSP and also among the boys and girls. The Spearman's Correlation Coefficient was used to correlate CSP and dental caries among the three study groups and also among the groups. RESULTS CSP was observed in 69%, 83% and 76% of children with primary, mixed and permanent dentition respectively (p>0.05). There was no statistically significant association between the presence of CSP and dental caries among the three study groups. CONCLUSION There was a weak or no correlation between gender and distribution of CSP and between presence of CSP and dental caries.
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Affiliation(s)
- Ullal Anand Nayak
- Professor and Head of Department, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Reena Sharma
- Postgraduate Student, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Nilotpol Kashyap
- Professor, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Deepesh Prajapati
- Senior Lecturer, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Damodar Kappadi
- Reader, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Saakshe Wadhwa
- Postgraduate Student, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Shina Gandotra
- Postgraduate Student, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
| | - Poonam Yadav
- Postgraduate Student, Department of Pedodontics and Preventive Dentistry, NIMS Dental College and Hospital , Jaipur, Rajasthan, India
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Yalçın Yeler D, Yılmaz N, Koraltan M, Aydın E. A survey on the potential relationships between TMD, possible sleep bruxism, unilateral chewing, and occlusal factors in Turkish university students. Cranio 2016; 35:308-314. [PMID: 27707365 DOI: 10.1080/08869634.2016.1239851] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To evaluate whether there is a relationship between possible sleep bruxism (PSB), temporomandibular disorders (TMD), unilateral chewing (UC), and occlusal factors in university students recruited from Cumhuriyet University in Turkey. METHODS For this cross-sectional survey, 519 (223 males, mean age 21.57 ± 2.3 years, 296 females, mean age 21.02 ± 2 years) university students who admitted to the Department of Oral and Maxillofacial Radiology of the Faculty of Dentistry, Cumhuriyet University for dental care between 2012 and 2014 were selected randomly. Students were asked to complete a questionnaire form including questions about TMD, PSB and UC. Presence and direction of malocclusion were recorded during clinical examination. Chi-square test was used for statistical analysis. RESULTS It was found that 96.6% of the students with PSB had TMD (p < 0.05). The prevalence of severe TMD was high among students with PSB. There was a significant association between UC, PSB and TMD (p < 0.05). No statistically significant association was found between occlusal factors and PSB and TMD (p > 0.05). CONCLUSION Sleep bruxism, which heavily depends on self-report, is significantly associated with TMD. Unilateral chewing seems to be a common factor for development of SB and TMD. However, further studies are needed to corroborate this finding. Additionally, this study supports the hypothesis that occlusal factors are not related to self-reported sleep bruxism.
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Affiliation(s)
- Defne Yalçın Yeler
- a Faculty of Dentistry, Department of Oral and Maxillofacial Radiology , Cumhuriyet University , Sivas , Turkey
| | - Nurbengu Yılmaz
- b Faculty of Dentistry, Department of Orthodontics , Cumhuriyet University , Sivas , Turkey
| | - Melike Koraltan
- a Faculty of Dentistry, Department of Oral and Maxillofacial Radiology , Cumhuriyet University , Sivas , Turkey
| | - Ezgi Aydın
- c Faculty of Dentistry, Department of Oral and Maxillofacial Surgery , Cumhuriyet University , Sivas , Turkey
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Dib A, Montero J, Sanchez JM, López-Valverde A. Electromyographic and patient-reported outcomes of a computer-guided occlusal adjustment performed on patients suffering from chronic myofascial pain. Med Oral Patol Oral Cir Bucal 2015; 20:e135-43. [PMID: 25475783 PMCID: PMC4393974 DOI: 10.4317/medoral.20272] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 09/09/2014] [Indexed: 11/22/2022] Open
Abstract
Objectives: Muscular hyperactivity is a potential source of symptoms in patients with temporal-mandibular disorders. An adequate occlusal adjustment may relieve such symptoms. This study aims to measure the effect of shortening the protrusive disclusion time (DT) and balancing the center of occlusal forces (COF) on the EMG recordings and assess the pain reported by chronic patients one month after the computer-guided occlusal adjustment.
Study Design: The sample studied comprised 34 patients suffering from chronic facial pain in which the EMG activity of both masseters was recorded by electromyography. By selective grinding we alleviated all the occlusal interferences during the mandibular protrusion from the habitual closure position in order to establish an immediate posterior disclusion and an equilibration of the COF.
Results: At follow-up 76.5% of the patients reported no facial pain. Moreover, the EMG activity and protrusive DT were significantly reduced, and occlusal and muscular function were significantly more symmetric than at baseline.
Conclusions: According to this EMG study, this computer-guided occlusal adjustment is able to reduce the activity of the masseters and the self-reported muscular pain of patients one-month after treatment.
Key words:Myofascial pain, occlusal adjustment, electromyography, T-Scan III, occlusal interferences.
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Affiliation(s)
- Abraham Dib
- Dental School, Faculty of Medicine, University of Salamanca, Spain, C/Alfonso X el Sabio, Campus Miguel de Unamuno, PC 37007, Salamanca, Spain,
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Yu Q, Liu Y, Chen X, Chen D, Xie L, Hong X, Wang X, Huang H, Yu H. Prevalence and associated factors for temporomandibular disorders in Chinese civilian pilots. Int Arch Occup Environ Health 2015; 88:905-11. [PMID: 25595563 DOI: 10.1007/s00420-015-1018-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 01/08/2015] [Indexed: 12/28/2022]
Abstract
PURPOSE Piloting is a special profession with prolonged stress, which could induce the occurrence of TMD. This sample is useful to reduce the effect of confounders in the analyses. Based on this, the present study aims to determine the prevalence and associated factors for TMD in civilian pilots of China. METHODS A cross-sectional epidemiological survey was carried out in 616 male subjects (aged 23-52 years). The questionnaire included general information, chewing preference (bilateral or unilateral), and Trait Anxiety section of Spielberger State-Trait Anxiety Inventory (STAI-T). The clinical examination contained TMD screening per research diagnostic criteria for TMD and diagnosis of sleep bruxism per American Academy of Sleep Medicine standards. The level of statistical significance was set at P ≤ 0.05. RESULTS The program was conducted from June 2012 to April 2013, in which period, and the percentage of TMD in the samples we examined was 33.3 % (=205/616). Only high anxiety (OR 2.48; 95 % CI 1.25-4.90) and unilateral chewing preference (OR 12.67; 95 % CI 7.77-20.65) were the most significant associated factors with TMD. Also, salivary cortisol and the STAI-T score had a significant correlation (r = 0.47, P < 0.001). CONCLUSIONS It was more reliable to study the associated factors on TMD with the exclusion of the possible confounding factors, and only unilateral chewing preference and psychological stress had a significant association with TMD. In addition, the salivary cortisol levels might assist to assess psychological stress in epidemiological research.
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Affiliation(s)
- Qing Yu
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Yang Liu
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Xi Chen
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Duanjing Chen
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Lu Xie
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Xiao Hong
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China
| | - Xingyuan Wang
- Medical Center of Shenzhen Airlines, Shenzhen, 518128, China
| | - Haili Huang
- Medical Center of Shenzhen Airlines, Shenzhen, 518128, China
| | - Haiyang Yu
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China.
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Somatosensory evoked magnetic fields following tongue and hard palate stimulation on the preferred chewing side. J Neurol Sci 2014; 347:288-94. [DOI: 10.1016/j.jns.2014.10.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Revised: 09/22/2014] [Accepted: 10/14/2014] [Indexed: 11/20/2022]
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Jiang H, Li C, Wang Z, Cao J, Shi X, Ma J, Liu H. Assessment of osseous morphology of temporomandibular joint in asymptomatic participants with chewing-side preference. J Oral Rehabil 2014; 42:105-12. [PMID: 25316207 DOI: 10.1111/joor.12240] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/30/2014] [Indexed: 11/29/2022]
Abstract
Chewing-side preference (CSP) may be associated with temporomandibular disorders. However, little information exists regarding whether CSP will lead to osseous changes of temporomandibular joint (TMJ) in asymptomatic participants. The aim of this study was to investigate the relationship between osseous morphology of TMJ in asymptomatic participants with CSP and without CSP. Of the 121 healthy dentate participants, 35 participants with left CSP, 38 with right CSP and other 48 without CSP were scanned by cone-beam computed tomography. The dimensions of the reconstructed images of opposing TMJs were compared. Statistical analyses were performed using spss 16.0 software. The results showed that there were no significant differences between the dimensions of bilateral structures of the TMJ (P1 > 0·05) in participants without CSP. However, the posterior-superior, posterior and lateral joint space of the preferred side were smaller than that of the unpreferred side in participants with CSP (P2 < 0·01) and bilateral TMJ in participants without CSP (P3 < 0·01). In addition, width of condylar neck of the unpreferred side both in sagittal and perpendicular to the long axis of condyle views was greater than that of the preferred side in participants with CSP (P2 < 0·01) and bilateral TMJ of participants without CSP (P4 < 0·01). Also, the inclination of articular eminence of the preferred side in view perpendicular to the long axis of condyle was less than that of the unpreferred side (P2 < 0·05). These findings suggest CSP affects osseous morphology of TMJ in asymptomatic participants.
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Affiliation(s)
- H Jiang
- Department of Stomatology, Chinese PLA General Hospital, Beijing, China
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Haralur S, Al-Gadhaan S, Al-Qahtani A, Mossa A, Al-Shehri W, Addas M. Influence of functional head postures on the dynamic functional occlusal parameters. Ann Med Health Sci Res 2014; 4:562-6. [PMID: 25221705 PMCID: PMC4160681 DOI: 10.4103/2141-9248.139319] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background: The dentist utilizes supine position during therapeutic procedures, while the patients assumes extended head posture during mastication. It is critical for the restorative dentist to evaluate and understand the possible effect of change in head posture on occlusal contacts. An understanding of the possible effect will help in better restorative rehabilitation. Aim: The aim of the following study is to evaluate the influence of head postures on the dynamic occlusal parameters. Subjects and Methods: Study group consisted of 50 students from College of Dentistry, King Khalid University. The students were selected randomly from the college student body; they were in the age group of 18-25 years. The head posture evaluated were supine position, upright sitting position and alert feeding position. The head postures were standardized by goniometer and dynamic occlusal contacts were analyzed with Tscan. The data obtained was subjected to statistical analysis with repeated measures of ANOVA to identify the changes in occlusal contacts. Results: The occlusion time was 1.366 (0.484), 1.226 (0.562) and 0.997 (0.429) s for supine, upright and alert feeding position respectively. Disclusion time was for right lateral movement was 0.872 (0.372), 0.629 (0.290) and 0.831 (0.369) s for corresponding head postures. Left lateral disclusion time was 0.621 (0.274), 0.274 (0.345) s for upright and alert feeding posture. Repeated measures of ANOVA showed statistically significant difference between occlusal contacts in different head postures. Conclusion: Within the limitation of the study, it was concluded that there were significant changes in initial occlusal contact, occlusion and disclusion time at all the head postures evaluated in the study.
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Affiliation(s)
- Sb Haralur
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
| | - Sm Al-Gadhaan
- Department of Intern Dentist, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
| | - As Al-Qahtani
- Department of Intern Dentist, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
| | - A Mossa
- Department of Intern Dentist, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
| | - Wa Al-Shehri
- Department of Intern Dentist, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
| | - Mk Addas
- Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Kingdom of Saudi-Arabia
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Temporomandibular disorders: the habitual chewing side syndrome. PLoS One 2013; 8:e59980. [PMID: 23593156 PMCID: PMC3620406 DOI: 10.1371/journal.pone.0059980] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Accepted: 02/19/2013] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Temporomandibular disorders are the most common cause of chronic orofacial pain, but, except where they occur subsequent to trauma, their cause remains unknown. This cross-sectional study assessed chewing function (habitual chewing side) and the differences of the chewing side and condylar path and lateral anterior guidance angles in participants with chronic unilateral temporomandibular disorder. This is the preliminary report of a randomized trial that aimed to test the effect of a new occlusal adjustment therapy. METHODS The masticatory function of 21 randomly selected completely dentate participants with chronic temporomandibular disorders (all but one with unilateral symptoms) was assessed by observing them eat almonds, inspecting the lateral horizontal movement of the jaw, with kinesiography, and by means of interview. The condylar path in the sagittal plane and the lateral anterior guidance angles with respect to the Frankfort horizontal plane in the frontal plane were measured on both sides in each individual. RESULTS Sixteen of 20 participants with unilateral symptoms chewed on the affected side; the concordance (Fisher's exact test, P = .003) and the concordance-symmetry level (Kappa coefficient κ = 0.689; 95% confidence interval [CI], 0.38 to 0.99; P = .002) were significant. The mean condylar path angle was steeper (53.47(10.88) degrees versus 46.16(7.25) degrees; P = .001), and the mean lateral anterior guidance angle was flatter (41.63(13.35) degrees versus 48.32(9.53) degrees P = .036) on the symptomatic side. DISCUSSION The results of this study support the use of a new term based on etiology, "habitual chewing side syndrome", instead of the nonspecific symptom-based "temporomandibular joint disorders"; this denomination is characterized in adults by a steeper condylar path, flatter lateral anterior guidance, and habitual chewing on the symptomatic side.
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Barcellos DC, da Silva MA, Batista GR, Pleffken PR, Pucci CR, Borges AB, Rocha Gomes Torres C, Gonçalves SEDP. Absence or weak correlation between chewing side preference and lateralities in primary, mixed and permanent dentition. Arch Oral Biol 2012; 57:1086-92. [PMID: 22469391 DOI: 10.1016/j.archoralbio.2012.02.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 01/25/2012] [Accepted: 02/27/2012] [Indexed: 01/29/2023]
Abstract
OBJECTIVES To determine whether chewing side preference (CSP) is correlated to lateralities (handedness, footedness, eyedness and earedness) in primary, mixed and permanent dentitions. DESIGN Three-hundred subjects were divided into 3 groups: Group 1--100 children 3-5 years old, primary dentition; Group 2--100 children 6-12 years old, mixed dentition; Group 3--100 subjects 18-47 years old, permanent dentition. CSP was determined using a method developed by Mc Donnell et al. Subjects were given a piece of gum and the position of the chewing gum was recorded 7 times as right or left. Subjects were classified as 'observed preferred chewing side' (OPCS) when they performed 5/7, 6/7 or 7/7 strokes on the same side. OPCS corresponded to the CSP. Laterality tests were performed for handedness, footedness, eyedness and earedness tasks. The Chi-square (χ(2)) and phi correlation (r) tests were used to investigate significant correlations between CSP and sidedness. RESULTS There was a significant correlation between chewing and earedness (p=0.00), although there was weak positive correlation (r=0.30) for primary dentition. There were significant correlations between chewing and handedness (p=0.02; r=0.25) and chewing and footedness (p=0.02; r=0.26), however, there were weak positive correlations for mixed dentition; there were significant correlations between chewing and handedness (p=0.02; r=0.26); chewing and footedness (p=0.00; r=0.33) and chewing and earedness (p=0.01; r=0.29); however, there were weak positive correlations for permanent dentition. CONCLUSION It may be concluded that CSP can be significantly correlated with: earedness for primary dentition; handedness and footedness for mixed dentition; handedness, footedness and earedness for permanent dentition, but these are weak positive relationships. Future work on larger samples of left- and right-sided individuals is required to validate the findings.
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Affiliation(s)
- Daphne Camara Barcellos
- Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University, SP, Brazil.
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Barcellos DC, Gonçalves SEDP, da Silva MA, Batista GR, Pleffken PR, Pucci CR, Borges AB, Rocha Gomes Torres C. Prevalence of chewing side preference in the deciduous, mixed and permanent dentitions. J Contemp Dent Pract 2011; 12:339-42. [PMID: 22269193 DOI: 10.5005/jp-journals-10024-1056] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
AIM This study evaluated the prevalence of the chewing side preference (CSP) in the deciduous, mixed and permanent dentitions. MATERIALS AND METHODS Three-hundred subjects were divided in three groups (n = 100): Group 1 - children with deciduous dentition; group 2-children with mixed dentition; group 3 - subjects with permanent dentition. The CSP was determined using a direct method (visual observation) developed by McDonnell et al. (2004). Descriptive statistic was used to observe the prevalence of CSP. The Pearson's Chi-square was used to investigate signicant associations between gender, presence of CSP and preferred side (right/left). RESULTS AND CONCLUSION Eighty-seven percent of group 1 had a CSP. Eighty-two percent of group 2 had a CSP. Seventy-six percent of group 3 had a CSP. There was no statistically significant association between presence of CSP and gender in all groups. There was no statistically significant association between preferred side (right/left) and gender in all groups. CLINICAL SIGNIFICANCE There is a higher prevalence of subjects in deciduous, mixed and permanent dentition that presented chewing side preference. The early diagnosis of the presence of chewing side preference can prevent the unilateral chewing pattern with prophylactic therapy applied to the first teeth (deciduous).
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Affiliation(s)
- Daphne Camara Barcellos
- Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University, Brazil
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Shiga H, Kobayashi Y, Arakawa I, Yokoyama M, Nakajima K. Influence of two masticating conditions on assessment of movement path stability. J Prosthodont Res 2011; 56:125-9. [PMID: 21820985 DOI: 10.1016/j.jpor.2011.06.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 06/08/2011] [Accepted: 06/12/2011] [Indexed: 10/17/2022]
Abstract
PURPOSE The purpose of this study was to clarify whether differences in masticating conditions affected masticatory path stabilities of healthy subjects and TMD patients. METHODS Twenty healthy female subjects as the healthy group, and 20 female Temporomandibular Disorders (TMD) patients as the TMD group, were selected. Incisal point movement of during mastication of both masticating condition 1 (mc1; crispy bread chewed until swallowing on the free side) and masticating condition 2 (mc2; softened chewing-gum chewed for 20s on the habitual side) were recorded by MKG. As for mc1, out of all cycles during mastication only those cycles on the habitual chewing side were analyzed. As for mc2, the ten cycles from the fifth cycle were analyzed. For these analyzed sections, the indicators representing movement path stability were calculated and compared between the two groups. RESULTS As for mc1, though the values of the indicators representing path stability were larger for the TMD group, there were cases where no significant differences were found between the two groups. As for mc2, the values were significantly larger for the TMD group (SDs; P<0.05, SD/ODs; P<0.01). CONCLUSIONS From these results, it was suggested that the differences in masticating conditions affected the assessment of masticatory path stabilities of healthy subjects and TMD patients and the conditions should be considered for analyzing masticatory movement.
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Affiliation(s)
- Hiroshi Shiga
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, Japan.
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Deda MRDC, Picinato-Pirola MNDC, Mello-Filho FVD, Voi Trawitzki LV. Inclinação de cabeça durante a mastigação habitual nas deformidades dentofaciais classe II e III. REVISTA CEFAC 2010. [DOI: 10.1590/s1516-18462010005000133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJETIVO: este estudo investiga a diferença entre grupos com deformidade dentofacial (padrão classe II e classe III), em relação à preferência mastigatória referida e inclinação de cabeça durante a mastigação, assim como predomínio intra-grupo de cada um desses aspectos, comparativamente a um grupo controle. MÉTODOS: participaram deste estudo, voluntariamente, 25 pacientes (entre 18 e 35 anos). Doze pacientes com diagnóstico de deformidade dentofacial classe II e 13 pacientes com o diagnóstico de classe III esquelética e 10 voluntários, com equivalência em sexo e idade ao grupo de deformidade, formando o grupo controle. Os voluntários da pesquisa foram questionados sobre a existência de um lado de preferência mastigatória. Em seguida foram filmados durante a mastigação habitual de um biscoito maizena e através das imagens captadas, a postura de cabeça pôde ser analisada. RESULTADOS: não houve diferença entre os grupos em relação à preferência mastigatória referida, entretanto os grupos com deformidades dentofaciais apresentaram predomínio significativo de preferência mastigatória referida. Os grupos com deformidade dentofacial apresentaram maior predomínio de inclinação de cabeça durante a mastigação quando comparados ao grupo controle. CONCLUSÃO: indivíduos com deformidade dentofacial podem apresentar uma preferência mastigatória e alteração de postura de cabeça durante a mastigação.
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Gebeile-Chauty S, Robin O, Messaoudi Y, Aknin JJ. [Can orthodontic treatment generate temporomandibular disorders and pain? A review]. Orthod Fr 2010; 81:85-93. [PMID: 20359451 DOI: 10.1051/orthodfr/2010009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
While considered for years to play the primary role in the etiology of temporo-mandibular joint disturbances (TMD), occlusal discrepancies are now considered to be just one causative factor among many. Recent studies, literature reviews or meta-analyses, and longitudinal studies with follow-up of children treated for many years all conclude that there is no risk of orthodontic treatment giving rise to episodes of temporo-mandibular disorders. The signs of TMD appearing during the course of orthodontic treatment should be considered in the context of the epidemiology of the disorder, which is characterized by a strong increase in its occurrence during adolescence. In conclusion, it should be stated that if orthodontic treatment can no longer be considered as one of the etiopathogenic factors in the TMD complex, there are no scientific arguments to justify the converse, that there are indications for orthodontic treatment whose sole goal would be the treatment of TMD.
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Affiliation(s)
- Sarah Gebeile-Chauty
- Département d'Orthopédie Dento-Faciale, Faculté d'Odontologie, 11 rue Guillaume Paradin, 69372 Lyon Cedex 08, France.
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Diernberger S, Bernhardt O, Schwahn C, Kordass B. Self-reported chewing side preference and its associations with occlusal, temporomandibular and prosthodontic factors: results from the population-based Study of Health in Pomerania (SHIP-0). J Oral Rehabil 2009; 35:613-20. [PMID: 18699970 DOI: 10.1111/j.1365-2842.2007.01790.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study investigated the prevalence of a preferred chewing side (PCS) and associations between a PCS and signs of temporomandibular disorders (TMD), antagonist contact and prosthetic restoration. A population representative sample of 4086 adults of the cross-sectional epidemiologic 'Study of Health in Pomerania' (SHIP-0) (age range 20-80 years, female 50.2%) was divided in two groups by the presence or absence of a PCS. PCS was evaluated by a questionnaire. Chi-squared tests and multiple logistic regression were used to determine the impact of the relation between a PCS and signs and symptoms of TMD as well as dental factors. The prevalence of a PCS was 45.4%. Women between 40 and 69 years reported more frequently a PCS. There was a preference for the right side (64%). The following independent variables were significantly associated with a PCS: subjective unilateral pain in the temporomandibular joint (TMJ), odds ratio (OR) 2.4; subjective unilateral joint clicking, OR 1.7; unilateral TMJ/muscle pain on palpation, OR 1.6/OR 1.3; loss of one supporting zone (Eichner-Classification), OR 1.9; loss of both supporting zones on one side, OR 2.2, one supporting zone left, OR 1.4; presence of a removable partial denture, OR 1.6; presence of an attachment restoration, OR 1.5. A PCS was found in almost half the study population and was associated with unilateral signs of TMD, most of all TMJ pain and asymmetrical loss of antagonist contact. Despite replacement of lost teeth not all restorations seemed to support bilateral mastication.
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Affiliation(s)
- S Diernberger
- Department of Orthodontics, Centre of Oral Health, University of Vienna, Vienna, Austria.
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Pinheiro AP, Andrade AO, Pereira AA, Bellomo D. A computational method for recording and analysis of mandibular movements. J Appl Oral Sci 2008; 16:321-7. [PMID: 19089228 PMCID: PMC4327597 DOI: 10.1590/s1678-77572008000500004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 05/28/2008] [Indexed: 11/23/2022] Open
Abstract
This study proposed the development of a new clinical tool capable of quantifying the movements of opening-closing, protrusion and laterotrusion of the mandible. These movements are important for the clinical evaluation of the temporomandibular function and muscles involved in mastication. Unlike current commercial systems, the proposed system employs a low-cost video camera and a computer program that is used for reconstructing the trajectory of a reflective marker that is fixed on the mandible. In order to illustrate the clinical application of this tool, a clinical experiment consisting on the evaluation of the mandibular movements of 12 subjects was conducted. The results of this study were compatible with those found in the literature with the advantage of using a low cost, simple, non-invasive, and flexible tool customized for the needs of the practical clinic.
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Affiliation(s)
- Alan Petrônio Pinheiro
- Laboratory of Biomedical Engineering, Federal University of Uberlândia, Uberlândia, MG, Brazil.
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Martinez-Gomis J, Lujan-Climent M, Palau S, Bizar J, Salsench J, Peraire M. Relationship between chewing side preference and handedness and lateral asymmetry of peripheral factors. Arch Oral Biol 2008; 54:101-7. [PMID: 18947820 DOI: 10.1016/j.archoralbio.2008.09.006] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2008] [Revised: 07/22/2008] [Accepted: 09/14/2008] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To determine whether chewing side preference is related to handedness and lateral asymmetry of occlusal characteristics, muscular force and temporomandibular disorders (TMD) in a dentate population. DESIGN One hundred and seventeen dentate adults participated in this cross-sectional study. Static and dynamic occlusal characteristics were determined at the maximal intercuspal position and at the lateral excursions by scanning interocclusal records and analysing them using image software. Unilateral maximum bite force and finger-thumb grip force were measured by means of a gnathodynamometer. TMD were assessed according to the Research Diagnostic Criteria for TMD. Chewing side preference and masticatory laterality were determined by observing the jaw's movement while each subject chewed silicone. Asymmetry or side difference of the variables was calculated. Correlation between side difference variables and masticatory laterality was studied using Spearman correlation coefficient. RESULTS Fifty-nine subjects chewed on the right, 15 on the left and 43 chewed on both sides. There was no relationship between preferred chewing side and handedness, lateral asymmetry of TMD or side difference in finger-thumb grip force. Significant and positive correlations were observed between masticatory laterality and side differences in bite force and side differences in occlusal contact area at intercuspal position (P<0.01). CONCLUSIONS Chewing side preference in a dentate population is related to lateral asymmetry of bite force and asymmetry of occlusal contact area at the intercuspal position but not to handedness.
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Affiliation(s)
- Jordi Martinez-Gomis
- Department of Prosthodontics, Faculty of Dentistry, University of Barcelona, Spain.
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