Study on measurement and analysis of jaw movements during sleep bruxism

DOI 7 Citations 28 References
  • Noguchi Naoto
    Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School
  • Shigemoto Shuji
    Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School
  • Okura Kazuo
    Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School
  • Bando Eiichi
    The University of Tokushima

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Other Title
  • 睡眠時ブラキシズム発現に伴う顎運動の測定解析法の検討

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Sleep bruxism is defined as a stereotyped movement disorder occurring during sleep. It is characterized by three types of jaw movements: clenching, grinding and tapping. Most of the previous studies have focused on EMG activities of the masticatory muscles, while very few have reported jaw movements during sleep. The purpose of this study was to measure and analyze jaw movement during sleep bruxism. We developed a novel jaw-tracking device with six degrees of freedom using a pair of intra-oral sensors which can be used during sleep. We then constructed a six-degree-of-freedom measurement system of jaw movements during sleep which consisted of the developed jaw-tracking device and an ambulatory polysomnograph that records jaw movements, EEG, EOG, ECG and EMG. A healthy 41-year-old male volunteer with no signs and symptoms of stomatognathic dysfunction was examined for an entire night's sleep using this system. A total of 19 bruxism events (4.8 events/hour) was detected based on the masseter EMG activities above 5%MVC. Mean duration and mean peak activity of the masseter EMG were 3.4±1.5 sec and 31.3±18.6 %MVC, respectively. The masseter EMG activity and jaw movement patterns during these bruxism events were used to classify bruxism types independently. On evaluation of the EMG activities, one clenching-type event and 18 grinding-type events were observed. On the other hand, six clenching-type events, one grinding-type event, seven tapping-type events and five combination-type events were found on evaluation of the jaw movement record. Masseter EMG activities above 5%MVC were observed during bruxism events not only at and around the centric jaw position but also at the eccentric jaw position, contrary to our assumption. These findings indicate the validity of the jaw movement analysis for the evaluation and diagnosis of sleep bruxism.

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