Imaging study of the effect of unilateral anterior disk displacement without reduction and sleep bruxism on bone structures of the temporomandibular joints

doi:10.19439/j.sjos.2025.05.007

Abstract

Abstract: PURPOSE: To investigate the effects of unilateral anterior disk displacement without reduction and sleep bruxism on bone structure of the temporomandibular joint (TMJ). METHODS: From January 2015 to February 2022, a total of 17 cases of unilateral anterior disk displacement without reduction admitted to the First Affiliated Hospital of Xinjiang Medical University were selected as the joint disk displacement group, while 15 cases of sleep bruxism as the sleep bruxism group, and 19 healthy adults were selected as the control group. The CBCT data obtained were imported into Mimics Research 21.0 for morphological measurement of TMJ bone structure and analysis of bone mineral density (BMD). RESULTS: Compared with the control group, the internal and external diameter of condyle, the posterior slope of condyle and the top BMD in the unilateral anterior disk displacement without reduction group were lower than those in the control group, and the difference was significant(P<0.05); the inclination of joint eminence was larger than that of control group, and the difference was statistically significant(P<0.05). The depth of right articular fossa of sleep bruxism was shallower than that of the control group, and the BMD of anterior inclined surface of condyle was lower, the differences were statistically significant(P<0.05). The BMD of the left anterior condylar slope in the sleep bruxism group was lower than that in the control group, and the difference was statistically significant(P<0.05). CONCLUSIONS: The condyle of TMJ in the unilateral anterior disk displacement without reduction group became smaller and the slope of the joint emminance increased during the reconstruction. The BMD of the posterior slope and the top of the condyle decreased significantly compared with the control group. However, the BMD of the anterior bevel of the condyle may be decreased due to the asymmetric stress distribution in the sleep bruxism group, and appropriate diagnosis and management of sleep bruxism are necessary.

Key words: Temporomandibular joint, Articular disc displacement, Sleep bruxism, Condyle process, Bone mineral density

CLC Number:

R782.6

Wang Yanyan, Gong Zhongcheng, Wang Bing, Sakendeke· Jumatai, Li Chenxi, Xu Yingjie, Shao Bo, Fang Chang, Jia Mengying. Imaging study of the effect of unilateral anterior disk displacement without reduction and sleep bruxism on bone structures of the temporomandibular joints[J]. Shanghai Journal of Stomatology, 2025, 34(5): 490-495.

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