Electromyographic correlates of experimentally induced stress in diurnal bruxists and normals.

Diurnal bruxists and normals were compared in responsiveness to stress and on psychological status. Results indicated that masseter EMG activity was significantly higher at rest for bruxists than normals, that bruxists responded differentially more to stress than normals, and that no significant differences were present between bruxists and normals on the psychological measures.