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Electromyographic evaluation of the effect of ultrasound with muscle stretching in temporomandibular disorder: a clinical trial
Boufleur, Jalusa; Corrêa, Eliane Castilhos Rodrigues; Chiodelli, Lais; da Silva, Ana Maria Toniolo & Ries, Lilian Gerdi Kittel
Abstract
Aim: To investigate the electromyographic activity of masticatory muscles in women with myogenic
or mixed TMD treated with ultrasound and ultrasound associated with stretching. Methods:
Sixteen women with myogenic or mixed TMD, according to the Research Diagnostic Criteria for
Temporomandibular Disorder (RDC/TMD), participated in the study. The patients were evaluated
using surface electromyography (sEMG) of the masseter and anterior temporalis muscles, during
maximum intercuspation, before and immediately after application of therapeutic resources. All
patients were treated by ultrasound (US), ultrasound associated with stretching and placebo
ultrasound, by turns, once a week with a one-week minimum interval between them. Results:
There was greater symmetry of the masseter muscle electrical activity after ultrasound associated
with stretching (p=0.03). The electromyographic values for the maximum intercuspation as well as
the symmetry of anterior temporal muscle (p=0.47, p=0.84, p=0.84) and anteroposterior coefficient
(p=0.07, p=0.84, p=0.57) showed no statistically significant difference after the intervention, placebo,
ultrasound and ultrasound with stretching. Conclusions: These results indicate that a single
application of ultrasound and ultrasound associated with stretching were not able to modify the
activity pattern of the masticatory muscles during maximum intercuspation, except the symmetry of
the masseter muscle that increased with the last, in women with myogenic or mixed
temporomandibular disorder.
Keywords
temporomandibular joint disorder; electromyography; ultrasonics; muscle stretching excercise
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