Effect of Phototherapy on Masseter and Anterior Temporal Muscles Before Induction of Fatigue: A Randomized, Sham-Controlled, Blind Clinical Trial.

Abstract

OBJECTIVE:

This is a randomized, sham-controlled, blind clinical trial that aimed to evaluate the effect of phototherapy on bite force, mandibular range of motion, sensitivity to palpation, and fatigue in the masseter and anterior temporal muscles of young patients when administered before the induction of fatigue.

MATERIALS AND METHODS:

Fifty-two healthy volunteers aged 18-23 years were randomly allocated to a laser group and sham group. Both groups were submitted to a clinical evaluation to record mandibular range of motion, bite force, muscle sensitivity to palpation, and muscle fatigue. The laser group was then submitted to phototherapy (780 nm, 25 J/cm2, 50 mW, 20 sec, and 1 J per point) on three points of the masseter and one point of the anterior temporal muscle on each side. The sham group was submitted to the same procedure, but with the device switched off. The volunteers were then instructed to chew two pieces of gum (one on each side) for 6 min, with the pace set by a metronome calibrated to 80 bpm, followed by the reevaluation of all variables. The results were submitted to t-test and Wilcoxon test. A significance level of 5% (p < 0.05) was considered in all analyses.

RESULTS:

No statistically significant intergroup or intragroup differences were found for the variables analyzed.

CONCLUSIONS:

With the proposed protocol, phototherapy administered before the induction of fatigue did not lead to any changes in bite force and mandibular range of motion, indicating that further studies are needed with different phototherapy dosimetric parameters.

• Authors: Camila Haddad Leal de Godoy, Lara Jansiski Motta, Washington Steagall Júnior, Marcela Leticia Leal Gonçalves, Daniela Fátima Teixeira da Silva, Raquel Agnelli Mesquita-Ferrari, Aldo Brugnera Júnior, Sandra Kalil Bussadori
• Journal: Photomedicine and laser surgery (Photomed Laser Surg) Vol. 36 Issue 7 Pg. 370-376 (Jul 2018) ISSN: 1557-8550 [Electronic] United States
• PMID: 29768084 (Publication Type: Journal Article, Randomized Controlled Trial)

Topics

• Adolescent
• Bite Force
• Female
• Humans
• Male
• Masseter Muscle (radiation effects)
• Mastication
• Muscle Fatigue (radiation effects)
• Phototherapy
• Single-Blind Method
• Temporal Muscle (radiation effects)
• Young Adult