 Sleep bruxism has characteristically been defined by the American Academy of Sleep Medicine as an oral activity characterized by grinding or clenching of the teeth during sleep, usually associated with sleep arousals. For sleep bruxism diagnosis, to date the polysomnographic recordings represent the highest standard for sleep bruxism diagnosis, but they are concomitantly associated with disadvantages which include technical complexity, limited availability, and the fact that they are time-consuming and cost-intensive. Recently, a prototype of a diagnostic plate has been developed which allows a fully-automatic, computer-based quantification of abrasion thereupon for the assessment of sleep bruxism activity. The results of the pilot study were promising, and therefore, the aim of the present study is to refine and validate this new diagnostic method for quantification and monitoring of sleep bruxism. 