The Bulletín of Kanagawa Dental College

Vol. 37 No. 1       MARCH- 2009

ISSN: 0385-1443      UBIC: 65

ABSTRACT

Sleep bruxism has been described as a combination of various orofacial motor activities that include grinding, clenching and tapping, although an accurate distribution of these activities still remains to be clarified. We examined the muscle activities and mandibular movement patterns during sleep bruxism using a bruxism analyzing system that consisted of a 2-axis accelerometer, electroencephalography and electromyography. Nineteen healthy volunteers were recruited and screened to evaluate sleep bruxism in the sleep laboratory. The results showed that grinding was most common (59.5%), followed by clenching (35.6%), based on relative activity to maximum voluntary contraction (%MVC), whereas for tapping, the share was only (4.9%). It was concluded that the tapping, clenching, and grinding movements of the mandible could be effectively differentiated using the bruxism analyzing system and that sleep bruxism was predominantly perceived as grinding and clenching, which varied among individuals. Key words: Sleep bruxism / Accelerometer / Electromyography.

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