Jaw movements during sleep

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We have developed a six-degree-of-freedom measurement system of jaw movements during sleep, which can records jaw movements, EEG, EOG, ECG and EMG for an entire night’s sleep. Weused this system to measure masseter muscle activities and jaw positions during sleep bruxism. We found that unlike the grinding cycle in chewing, the forceful grinding movement during sleep bruxism occurs in the medial excursion but also in the lateral excursion, and these repeated and continuous forceful grinding movements during sleep can lead to wear and tear of the teeth and can cause fractures of the teeth and dental protheses.