Abstract
BackgroundSleep bruxism has been described as a combination of different orofacial motor activities that include grinding, clenching and tapping, although accurate distribution of the activities still remains to be clarified.MethodsWe 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.ResultsThe new system could easily distinguish the different patterns of bruxism movement of the mandible and the body movement. Results showed that grinding (59.5%) was most common, followed by clenching (35.6%) based on relative activity to maximum voluntary contraction (%MVC), whereas tapping was only (4.9%).ConclusionIt was concluded that the tapping, clenching, and grinding movement of the mandible could be effectively differentiated by the new system and sleep bruxism was predominantly perceived as clenching and grinding, which varied between individuals.
Highlights
Sleep bruxism has been described as a combination of different orofacial motor activities that include grinding, clenching and tapping, accurate distribution of the activities still remains to be clarified
Sleep bruxism is reported to be a common phenomenon in humans and many studies have shown that bruxism can harm the dentition, its supporting structures and the temporomandibular joint (TMJ) [2,3,4,5,6,7,8]
We studied the prevalence of bruxism in the general adult population using a custom-made colorstained plastic sheet, the BruxChecker, on the maxillary dentition overnight and found that occlusal contacts where the color was ground off were seen in the majority of subjects, indicating sleep bruxism [9]
Summary
Sleep bruxism has been described as a combination of different orofacial motor activities that include grinding, clenching and tapping, accurate distribution of the activities still remains to be clarified. Quality of sleep is strongly associated with somatic health and activity of the body. Sleep bruxism is reported to be a common phenomenon in humans and many studies have shown that bruxism can harm the dentition, its supporting structures and the temporomandibular joint (TMJ) [2,3,4,5,6,7,8]. The definition of "bruxer" is based upon patient reports of a history of tooth-grinding occurring more than three times a week for at least six months, as attested by their sleep partners [6,7]. We studied the prevalence of bruxism in the general adult population using a custom-made colorstained plastic sheet, the BruxChecker, on the maxillary dentition overnight and found that occlusal contacts where the color was ground off were seen in the majority of subjects, indicating sleep bruxism [9]
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