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Association between patterns of jaw motor activity during sleep and clinical signs and symptoms of sleep bruxism
Author(s) -
Yoshida Yuya,
Suganuma Takeshi,
Takaba Masayuki,
Ono Yasuhiro,
Abe Yuka,
Yoshizawa Shuichiro,
Sakai Takuro,
Yoshizawa Ayako,
Nakamura Hirotaka,
Kawana Fusae,
Baba Kazuyoshi
Publication year - 2017
Publication title -
journal of sleep research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 117
eISSN - 1365-2869
pISSN - 0962-1105
DOI - 10.1111/jsr.12481
Subject(s) - sleep bruxism , medicine , masticatory force , electromyography , polysomnography , tonic (physiology) , morning , tooth wear , masseter muscle , sleep (system call) , dentistry , audiology , physical therapy , anesthesia , physical medicine and rehabilitation , apnea , computer science , operating system
Summary The aim of this study was to investigate the association between patterns of jaw motor activity during sleep and clinical signs and symptoms of sleep bruxism. A total of 35 university students and staff members participated in this study after providing informed consent. All participants were divided into either a sleep bruxism group ( n = 21) or a control group ( n = 14), based on the following clinical diagnostic criteria: (1) reports of tooth‐grinding sounds for at least two nights a week during the preceding 6 months by their sleep partner; (2) presence of tooth attrition with exposed dentin; (3) reports of morning masticatory muscle fatigue or tenderness; and (4) presence of masseter muscle hypertrophy. Video‐polysomnography was performed in the sleep laboratory for two nights. Sleep bruxism episodes were measured using masseter electromyography, visually inspected and then categorized into phasic or tonic episodes. Phasic episodes were categorized further into episodes with or without grinding sounds as evaluated by audio signals. Sleep bruxism subjects with reported grinding sounds had a significantly higher total number of phasic episodes with grinding sounds than subjects without reported grinding sounds or controls (Kruskal–Wallis/Steel–Dwass tests; P < 0.05). Similarly, sleep bruxism subjects with tooth attrition exhibited significantly longer phasic burst durations than those without or controls (Kruskal–Wallis/Steel–Dwass tests; P < 0.05). Furthermore, sleep bruxism subjects with morning masticatory muscle fatigue or tenderness exhibited significantly longer tonic burst durations than those without or controls (Kruskal–Wallis/Steel–Dwass tests; P < 0.05). These results suggest that each clinical sign and symptom of sleep bruxism represents different aspects of jaw motor activity during sleep.