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Journal of Dental Research
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Sleep Bruxism: An Oromotor Activity Secondary to Micro-arousal

T. Kato

Centre d'etude du sommeil, Hopital du Sacré-Cœur de Montreal and Facultes de medecine dentaire et de medecine, Université de Montreal, C.P. 6128, Succursale Centre-Ville, Montréal (Quebec), Canada H3C 3J7

P. Rompré

Centre d'etude du sommeil, Hopital du Sacré-Cœur de Montreal and Facultes de medecine dentaire et de medecine, Université de Montreal, C.P. 6128, Succursale Centre-Ville, Montréal (Quebec), Canada H3C 3J7

J.Y. Montplaisir

Centre d'etude du sommeil, Hopital du Sacré-Cœur de Montreal and Facultes de medecine dentaire et de medecine, Université de Montreal, C.P. 6128, Succursale Centre-Ville, Montréal (Quebec), Canada H3C 3J7

B.J. Sessle

Faculty of Dentistry, University of Toronto

G.J. Lavigne

Centre d'etude du sommeil, Hopital du Sacré-Cœur de Montreal and Facultes de medecine dentaire et de medecine, Université de Montreal, C.P. 6128, Succursale Centre-Ville, Montréal (Quebec), Canada H3C 3J7

Spontaneous rhythmic masticatory muscle activity (RMMA) during sleep occurs in relation to transient activation in the cerebral and autonomic nervous systems of normal subjects and in patients with sleep bruxism (SB). In this study, we made a quantitative assessment of the sequential changes in cortical electroencephalographic (EEG) and autonomic-cardiac activities associated with micro-arousals preceding RMMA episodes. We matched 10 SB patients with 10 normal subjects. The onset of RMMA episodes was defined in terms of the onset of activation in the suprahyoid muscles. In SB patients, an increase in cortical EEG activity was observed 4 seconds before the onset of suprahyoid activity in 79% of episodes. A significant acceleration in heart rate was initiated one cardiac cycle before RMMA onset. A clear sequence of cortical to autonomic-cardiac activation precedes jaw motor activity in SB patients. This suggests that SB is a powerful oromotor manifestation secondary to micro-arousal.

Key Words: sleep bruxism • autonomic nervous system • cortical EEG activity • micro-arousal • rhythmic masticatory muscle activity

Journal of Dental Research, Vol. 80, No. 10, 1940-1944 (2001)
DOI: 10.1177/00220345010800101501
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