• Paulo César R Conti, Juliana Stuginski-Barbosa, Leonardo R Bonjardim, Simone Soares, and Peter Svensson.
• Professor, Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil. Electronic address: pcconti@fob.usp.br.
• Oral Surg Oral Med Oral Pathol Oral Radiol. 2014 Jan 1;117(1):45-52.

ObjectiveThis study investigated the effect of contingent electrical stimulation (CES) on present pain intensity (PI), pressure pain threshold (PPT), and electromyographic events per hour of sleep (EMG/h) on probable bruxers with masticatory myofascial pain.Study DesignThe study enrolled 15 probable bruxers with masticatory myofascial pain in 3 phases: (1) baseline EMG/h recording, (2) biofeedback treatment using a CES paradigm (active group, n = 7) or inactive device (control group, n = 8), and (3) posttreatment EMG/h recording. PI and PPT were assessed after each phase. Analysis of variance models were used to compare results at a 5% significance level.ResultsPatients in the active group had 35% lower EMG/h in P2 and 38.4% lower EMG/h in P3, when compared with baseline. There were no differences in PI or PPT levels at any phase.ConclusionsCES could reduce EMG activity associated with sleep bruxism in patients with masticatory myofascial pain but did not influence perceived pain.Copyright © 2014 Elsevier Inc. All rights reserved.

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