Table 1 Clinical and polysomnographic criteria for diagnosis of sleep bruxism

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.