下颌咀嚼运动与夜磨牙症特征相关性的初步探究

ObjectiveTo investigate the correlation between the clinical diagnostic criteria of sleep bruxism and the frequency of mandibular movements during sleep.MethodsVideo 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.ResultsAmong 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 (PPConclusionThe 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.