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Sleep bruxism (SB) is a phenomenon that has been attracting the attention of clinicians and researchers of several medical fields for decades. SB is currently viewed as part of the jaw motor activities that are grouped under the umbrella term bruxism. In 2013, an international expert consensus defined bruxism as

a repetitive jaw-muscle activity characterized by clenching or grinding of the teeth and/or by bracing or thrusting of the mandible. Bruxism has two distinct circadian manifestations: it can occur during sleep (indicated as sleep bruxism [SB]) or during wakefulness (indicated as awake bruxism [AB]). (Lobbezoo et al., 2013, p. 2)

Although the two circadian manifestations are likely to have different etiology and clinical relevance, it is important to point out that, for both SB and AB, ...

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