Criteria
American Academy of Sleep Medicine[85]
Sleep-related bruxism:
A: The presence of repetitive jaw-muscle activity characterised by grinding or clenching of the teeth in sleep
B: The presence of one or more of the following clinical symptoms or signs consistent with the above reports of tooth-grinding or clenching during sleep:
Abnormal tooth wear
Transient morning jaw muscle pain or fatigue, or temporal headache
2017 international consensus panel on the assessment of bruxism[1]
Proposed diagnostic grading for sleep and awake bruxism:
Possible sleep/awake bruxism is based on a positive self-report only
Probable sleep/awake bruxism is based on a positive clinical inspection, with or without a positive self-report
Definite sleep/awake bruxism is based on a positive instrumental assessment, with or without a positive self-report and/or a positive clinical inspection.
It should be stressed that research is needed to establish the reliability, validity, and responsiveness to this proposed grading system.
Research diagnostic criteria for sleep bruxism (SB)[48][49]
Polysomnographic (PSG) diagnostic cut-off criteria for SB:
>4 bruxism episodes per hour of sleep
>6 bruxism bursts per episode and/or 25 bruxism bursts per hour sleep
>1 bruxism episode with grinding noise
These criteria are not strictly related to the presence of clinical symptoms. For instance, patients with <4 episodes per hour sleep may still have a clinically significant condition due to pain.[48]
Note that these criteria have been validated in a small sample of carefully selected individuals who may not be representative of the full spectrum of people with bruxism.[86] Additionally, PSG/SB criteria may provide only a partial picture of the complex range of jaw-muscle activities incorporated within the construct of bruxism and so are further limited in this regard.[50]
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