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Table 1 Clinical and polysomnographic criteria for diagnosis of sleep bruxism

From: Biofeedback for treatment of awake and sleep bruxism in adults: systematic review protocol

Clinical criteria Polysomnographic criteria
The participant reports or is aware of tooth grinding or clenching during sleep (3–5 nights per week over past 6 months) and one or more of the following: Polysomnographic monitoring demonstrates both of the following: jaw muscle activity during the sleep period and absence of associated epileptic activity.
Polysomnographic diagnostic cut-off criteria:
- Abnormal tooth wear, - More than four bruxism episodes per hour;
- Jaw muscle discomfort, fatigue or pain, and jaw lock upon awakening, - More than six bruxism bursts per episode and/or 25 bruxism bursts per hour of sleep; and
- Masseter muscle hypertrophy evident on voluntary forceful clenching. - At least two episodes with grinding sounds.