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Emotional stress and brux-like activity of the masseter muscle in rats

2002; Oxford University Press; Volume: 24; Issue: 1 Linguagem: Inglês

10.1093/ejo/24.1.107

1460-2210

Victoria Rosales,

Botulinum Toxin and Related Neurological Disorders

The aim of this study was to further clarify the relationship between emotional stress and bruxism. In experiment 1, 60 male 9‐week‐old Wistar rats were divided into four groups: the emotionally stressed (ES), the emotionally non‐stressed (NS), the electrically foot‐shocked (FSd), and the non‐foot‐shocked (NSd). ES rats were confined in a communication box for one hour a day to observe the emotional responses of neighbouring FSd rats. On days 0, 1, 4, 8, and 12, the electromyographic activity of the ES and NS rats' left masseter muscles was recorded for one hour, three hours after confinement in the communication box. Brux‐like activity appeared in the masseter muscle of the ES group on days 1, 4, 8, and 12, but not in the NS group.