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Comparison of Asymmetries on Masseter Muscle Thickness and Range of Motion in Subject With and Without Temporomandibular Disorders
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턱관절 장애 유무에 따른 깨물근의 두께와 턱관절 가동범위의 비대칭성 비교

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Type
Academic journal
Author
Journal
한국전문물리치료학회 한국전문물리치료학회지 한국전문물리치료학회지 제26권 제1호 KCI Accredited Journals
Published
2019.1
Pages
28 - 36 (9page)

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Comparison of Asymmetries on Masseter Muscle Thickness and Range of Motion in Subject With and Without Temporomandibular Disorders
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Background: Temporomandibular disorder (TMD) is characterized by pain and limited range of motion in the jaw. TMD patients generally prefer to chew on the unaffected or less-affected side, and this tendency often results in asymmetries in masseter muscle thickness and range of mandibular motion. Objects: The purpose of this study was to compare the asymmetries in masseter muscle thickness and range of mandibular motion in subjects with and without temporomandibular disorders. Methods: Thirty-nine subjects were divided into two groups: A TMD group (n1=19) and a control group (n2=20). The jaw opening range and laterotrusion were measured using a digital vernier caliper. The masseter muscle thickness was examined in both the resting state and the maximal clenching state using ultrasonography. The absolute asymmetry indices calculated based on the laterotrusion and masseter muscle thickness of the respective right and left sides. A two-way ANOVA and a Mann-Whitney U test were used for statistical analysis. Results: No significant different was found in the masseter muscle thickness between the TMD and control group. A significant difference was found in the absolute asymmetry indices of mandibular laterotrusion between the TMD and control groups (p<.05). Furthermore, the ranges of jaw opening were significantly different between males and females (p<.05). The absolute asymmetry index values of masseter muscle thickness at rest and during maximal clenching were also significantly different between males and females (p<.05). Conclusion: These results demonstrated that the subjects with TMD had a larger degree of asymmetry in laterotrusion than those without TMD. Therefore, a physiotherapy program needs to be designed to restore normal laterotrusion capacities for TMD subjects. These results also showed that female subjects had greater absolute asymmetry indices in masseter muscle thickness than male subjects. Therefore, more training is needed to promote bilaterally balanced chewing among women.

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References (41)

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Korkut Aldemir / 2013 / Ultrasound evaluation of masseter muscle changes in stabilization splint treatment of myofascial type painful temporomandibular diseases / Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology 116(3):377~383 Crossref Yoshiko Ariji / 2010 / Masseter muscle sonographic features as indices for evaluating efficacy of massage treatment / Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 110(4):517~526 Crossref Ariji Y / 2004 / Ultrasonographic features of the masseter muscle in female patients with temporomandibular disorder associated with myofascial pain / Oral Surg Oral Med Oral Pathol Oral Radiol Endod 98(3):337~341 google schola Youngsook Bae / 2013 / The Effect of Relaxation Exercises for the Masticator Muscles on Temporomandibular Joint Dysfunction (TMD) / Journal of Physical Therapy Science 25(5):583~586 Crossref Best N / 2013 / Measurement of mandible movements using a vernier caliper--an evaluation of the intrasession-, intersession-and interobserver reliability / Cranio 31(3):176~180 google schola

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