Sleep bruxism (SB) is a repetitive jaw muscle activity characterized by grinding or clenching of the teeth (Lobbezoo et al., 2013) and it is a possible risk factor for various ailments and disorders in the stomatognathic system, such as dislodgement of dental restorations, tooth fracture, tooth wear, periodontal disease and temporomandibular disorder. Studies have been conducted on the relationships of SB genesis with increase in sympathetic nerve activity, sleep state and genetic factors (
Sleep bruxism (SB) is a sleep-related movement disorder characterized by teeth grinding and clenching [1,2]. SB is a known risk factor for various dental problems, including tooth wear, tooth fracture, temporomandibular disorders, and the removal of crown restorations [3,4]. Studies have previously reported on the associations between SB and sympathetic nerve activity, the overall sleep state, and genetic factors [5][6][7]. However, the true state of SB and the mechanisms mediating SB genesis are not completely elucidated or understood to date.A clinical diagnosis of SB is determined based on clinical findings including self-awareness, interviews with a sleep partner, investigations of masticatory muscle fatigue and pain awareness, and tooth wear. The objectivity and accuracy of these findings are not sufficient [8][9][10][11][12]. Regarding the assessment of bruxism status, an international consensus meeting recently proposed three diagnostic stages:(1) possible sleep/wake bruxism based on self-report only, (2) probable sleep/wake bruxism based on self-report in addition to clinical inspection, and (3) definite sleep bruxism based on self-report and clinical inspection combined with polysomnography (preferably combined with audio/video recordings) [1,2].Masticatory muscle electromyography (EMG), a method objectively assessing SB, can generally be divided into two types: portable electromyography (EMG) and polysomnography (PSG). Polysomnography with audio-video recording (PSG-AV) under sleep laboratory conditions is currently considered the most reliable method for diagnosing SB [13]. In PSG-AV, sleep stages can be determined via electroencephalogram (EEG), electrooculogram (EOG), and EMG record-J Prosthodont Res. 2022; **(**):
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