The Bulletín of Kanagawa Dental College

Vol. 36 No. 2       September- 2008

ISSN: 0385-1443      UBIC: 65

ABSTRACT

Degenerative oral diseases such as occlusal trauma, temporomandibular dysfunction, abfraction and tooth migration are related to excessive biomechanical loads exerted by strong masticatory muscle activities during bruxism. The diagnosis and treatment planning of bruxism is becoming more relevant in dentistry, due to an increase in degenerative oral diseases. In this study, we developed a new system for analyzing sleep bruxism to examine the muscle activities and mandibular movement patterns during sleep bruxism. The system 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 indicate that there are considerable variations in sleep bruxism activity among individuals and that bruxism activity consists predominantly of grinding and clenching. Both clenching and grinding were related to sleep stage 2 with approximately 40% of occurrence, and 22-25% of bruxism activities were associated with microarousal. Key words: Sleep bruxism / Accelerometer / Grinding.

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