Study on the correlation between the mandibular masticatory muscle movement and sleep tooth wear.

Xiao Zeng; Yong Wang; Qiang Dong; Min-xian MA; Qin Liu; Jian-guo Tan

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Study on the correlation between the mandibular masticatory muscle movement and sleep tooth wear.

Author: Xiao ZENG ¹ ; Yong WANG ¹ ; Qiang DONG ¹ ; Min-Xian MA ¹ ; Qin LIU ¹ ; Jian-Guo TAN ²
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1. Dept. of Prosthodontics and Implant, Stomatological Hospital of Guizhou Medical University, Guiyang 550002, China.
2. Dept. of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Publication Type:Journal Article
Keywords: polysomnography; rhythmic masticatory muscle activity; sleep bruxism
MeSH: Adult; Electromyography; Humans; Masticatory Muscles; Polysomnography; Sleep; Sleep Bruxism; Tooth Attrition
From: West China Journal of Stomatology 2020;38(1):54-58
CountryChina
Language:Chinese
Abstract: OBJECTIVE:To investigate the correlation between the clinical diagnostic criteria of sleep bruxism and the frequency of mandibular movements during sleep.
METHODS:Video polysomnography was used to record 20 healthy adults with at least one of the following clinical symptoms and signs: 1) report of frequent tooth grinding; 2) tooth wear and dentin exposure with at least three occlusal surfaces; 3) masticatory muscle symptoms in the morning; 4) masseter muscle hypertrophy. The rhythmic masticatory muscle activity (RMMA) and isolated tonic activity were scored to compare the correlations with clinical symptoms and signs. Finally, the incidence of temporomandibular disorders (TMD) was investigated in patients with isolated tonic and RMMA subjects.
RESULTS:Among the 20 subjects, RMMA events were observed (5.8±3.1) times·h⁻¹ and isolated tonic episodes were observed (2.1±0.9) times·h⁻¹. The frequency of RMMA events was significantly greater in the patients with acoustic molars than in those without (P<0.05). Similarly, the frequency of RMMA events was significantly greater in the patients with tooth attrition than in those without (P<0.05). However, no difference was observed between the occurrence of RMMA and the symptoms of masticatory muscles or masseter hypertrophy in the morning. The incidence of TMD was significantly higher in the patients with RMMA than in the isolated tonic patients.
CONCLUSIONS:The clinical symptoms and signs often used to diagnose sleep bruxism are different clinical and physiological mandibular movements during sleep. RMMA during sleep can reflect the occurrence of tooth attrition and the high risk of TMD.