Influence of nocturnal bruxism on the stomatognathic system. Part I: a new device for measuring mandibular movements during sleep.
The purpose of this study was to investigate the influence of bruxism on the stomatognathic system. A new device for measuring nocturnal mandibular movements was developed using a PIN photodiode sensor, integrated with polysomnography including electromyography (EMG), electroencephalography (EEG) and electro oculography (EOG). One bruxing event was defined depending upon EMG activities above 5% maximum voluntary contraction (MVC), and mandibular movement for each event was classified into three patterns (clenching, grinding and mix). Three subjects were selected for this study. Two of these reported a bruxing habit and one subject had some symptoms of temporomandibular dysfunction (TMD). Mandibular movement was analysed for these subjects. Frequency and duration of the bruxism events were 4.5-10.9 and 47.8-174.9 s h(-1) respectively. Clenching type bruxism was most frequently observed for all three subjects and EMG activities during clenching were stronger than grinding.
Amemori
Y
Y
1st Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan. y.amamori.pro1@dent.tmd.ac.jp
Yamashita
S
S
Ai
M
M
Shinoda
H
H
Sato
M
M
Takahashi
J
J
D000328:Adult; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008334:Mandible / Q000503:physiopathology*; D008410:Masticatory Muscles / Q000503:physiopathology; D009068:Movement; D009119:Muscle Contraction; D009334:Neck Muscles / Q000503:physiopathology; D010865:Pilot Projects; D017286:Polysomnography / Q000295:instrumentation*; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted; D020186:Sleep Bruxism / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology*; D013704:Temporomandibular Joint / Q000503:physiopathology; D013706:Temporomandibular Joint Dysfunction Syndrome / Q000209:etiology