Effect of contingent electrical stimulation on masticatory muscle activity and pain in patients with a myofascial temporomandibular disorder and sleep bruxism

Karen G. Raphael, Malvin N. Janal, David A. Sirois, Peter Svensson

Research output: Contribution to journalArticle

Abstract

Aims: To determine whether an intervention reduces oromotor activity and masticatory muscle pain in myofascial temporomandibular disorder (M/TMD) patients with high levels of masticatory muscle activity associated with sleep bruxism. Methods: Fourteen women with M/TMD and prior polysomnographic evidence consistent with sleep bruxism participated in a 10-week single-group pre-test/ post-test mechanistic clinical trial. A 2-week period of baseline monitoring of individually biocalibrated electromyographic (EMG) events associated with sleep bruxism was followed by 6 weeks of EMGevent- contingent treatment via an innocuous electrical pulse to the skin overlying the temporalis muscle. Treatment was discontinued during 2-week follow-up monitoring. Each night before sleep, subjects recorded their average daily pain. Results: Mixed-model analysis of variance showed a reliable reduction of EMG events during contingent stimulation treatment periods, but frequency of EMG events returned to baseline levels during follow-up (linear term, P = .002; quadratic term, P = .001). In contrast, nightly pain reports failed to show any systematic changes during treatment (linear and quadratic trends, both P > .10). Conclusion: Spontaneous pain severity and nighttime oromotor activity vary independently over nights, even in M/TMD patients selected for relatively high levels of both characteristics.

Original languageEnglish (US)
Pages (from-to)21-31
Number of pages11
JournalJournal of Oral and Facial Pain and Headache
Volume27
Issue number1
DOIs
StatePublished - 2013

Keywords

  • Bruxism
  • Electromyography
  • Orofacial pain
  • Temporomandibular disorders

ASJC Scopus subject areas

  • Dentistry (miscellaneous)
  • Clinical Neurology
  • Anesthesiology and Pain Medicine

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