Within the limitations of this study, we concluded that polysomnography with bilateral masseter or temporalis electromyography traces yields good accuracy, and thus can be regarded as valid in the scoring of sleep bruxism in individuals with obstructive sleep apnea. In contrast, analysis using unilateral masseter or temporalis muscle electromyography results in only fair accuracy, and chin electromyography even yields poor accuracy. Consequently, these montages cannot be recommended for sleep bruxism scoring in the presence of obstructive sleep apnea.
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