Changes of TMJ, Muscle, and Occlusion Before and After Mandibular Retrusion Treatment

doi:10.13701/j.cnki.kqyxyj.2022.08.011

Abstract

Abstract: Objective: To investigate the changes of joint, muscle, and occlusal related indexes before and after functional orthodontic treatment, analyze the internal relationship between the factors, and explore their relationship with mandibular growth and stability of functional orthodontic treatment. Methods: Twenty-one children with Class Ⅱ mandibular retrusion who had completed functional orthodontic treatment were selected. The changes of TMJ, muscle, and occlusion before and after treatment were measured through CBCT images, and the results were analyzed. Results: After treatment, the length of condyle neck increased, the supracondylar and posterior spaces increased, the glenoid fossa distance and width increased, the mesial inclination angle of masseter muscle direction decreased, the occlusal plane rotated clockwise, and the labial inclination of lower incisors increased. The above changes were statistically significant (P<0.05). Conclusion: After treatment, although the adaptive remodeling of joints occurs in patients with mandibular retrusion, an incoordination exists between the direction of masseter muscle and the maximum occlusal force, and the changes of occlusal plane, lower anterior labial inclination, etc. may adversely affect the sagittal growth of mandible and the stability of curative effect.

Key words: mandibular retrusion, temporomandibular joint, glenoid fossa, masseter muscle

CHU Mengshi, LANG Xin, WASEEM SALEH AL-GUMAEI, QIN Rong, ZHANG Xinyu, ZHENG Yan. Changes of TMJ, Muscle, and Occlusion Before and After Mandibular Retrusion Treatment[J]. Journal of Oral Science Research, 2022, 38(8): 752-756.

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