Reliability of scoring EMG orofacial events: polysomnography compared with ambulatory recordings
The study of sleep bruxism is usually based on clinical history, signs and symptoms. The recording of electromyographic signals with either ambulatory portable home recorders or with polysomnographic techniques in the laboratory environment allows collection of objective data. The present study showed a 100% agreement with clinical evaluation in the recognition of bruxism episodes from the masseter electromyogram recorded with portable recorders and using the polysomnographic technique. On the contrary, scorers had difficulties in discriminating between different types f episodes (phasic, tonic and mixed), the between-scorers agreement varied between 62% and 63% and the -values between 0.43 and 0.33. The ideal time base at which electromyographic signals should be integrated to allow for a good discrimination of bruxism patterns is 0.06 s. The results indicate that portable electromyography recorders are a valuable complement to polysomnographic recordings of orofacial motor activities as they provide a very good recognition rate with adequate time base data collection.
Document Type: Regular Paper
Affiliations: 1: Department of Masticatory Disorders and Complete Dentures. Centre for Oral Medicine and Maxillo-Facial Surgery, University of Zurich, Switzerland 2: Faculty of Dentistry and Centre for Research in Neurological Science, University of Montreal, and Centre d'Études du Sommeil, Hôpital Sacré-Coeur, Montreal, Canada
Publication date: December 1, 1997