Document Type


Peer Reviewed


Publication Date


NLM Title Abbreviation

Braz J Oral Sci.

Journal/Book/Conference Title

Brazilian Journal of Oral Sciences

DOI of Published Version


Start Page


End Page



The use of low-level laser (LLL) may be an useful tool to promote reduction of muscular pain caused by TMD. Aim: This study evaluated the immediate efficacy of low-level laser therapy on women reporting pain and diagnosed with temporomandibular dysfunction (TMD). Methods: Diode laser (GaAlAs) at 790 nm wavelength (infrared spectrum) was applied as experimental treatment. Irradiations of 1.5 J/cm² were made at 4 points of the temporomandibular joint (TMJ) and of 3 J/cm² at 3 points in the temporal muscle. An electromyographic (EMG) evaluation of the masseter and anterior temporal was done at the following intervals: before, immediately after, 5 min and 20 min after laser application. Results: Comparison of the electrical activity at the times of measurement revealed a statistically significant difference in masseter muscles before (P=0.025) and immediately after (P=0.013) LLLT. Conclusions: Both masseter and temporal muscles showed a reduction in the measured EMG activities at all times after LLLT, and the temporal muscle showed higher EMG activity than the masseter muscle at all the evaluation times. LLLT caused significant immediate relaxation of the masseter muscles.


temporomandibular dysfunction, low-level laser, TMJ, TMD, electromyography, pain control

Journal Article Version

Version of Record

Published Article/Book Citation

Brazilian Journal of Oral Sciences, [S.l.], p. 434-438, dec. 2016. ISSN 1677-3225. Available at:


Copyright © 2010 Brazilian Journal of Oral Sciences. Posted by permission.

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This work is licensed under a Creative Commons Attribution 3.0 License.