Análise comparativa através da eletromiografia e biofotogrametria entre indivíduos sintomáticos e assintomáticos de disfunção temporomandibular (DTM)

Abstract

The objective of this study was to verify the electrical activity of masticatory and cervical muscles and the pattern of body posture in symptomatic individuals of Temporomanbular Disorders (TMD) comparing them with non symptomatic individuals, through the Electromyography and Biophotogrametry. It was evaluated 37 individuals of both sexes, 22 individuals with symptoms of TMD, with age between 21 and 54 years old, and 15 individuals non symptomatics, with age between 22 and 55 years old. All individuals answered a questionnaire to determine the TMD classification and, next they accomplished an electromyographic evaluation of masticatory muscles (masseter and anterior temporal) and cervical muscles (sternocleidomastoid and upper trapezius). All muscles were evaluated in the rest and during the maximal voluntary contraction. The electrical activity of masseter and temporal muscles was also verified during the mastication. The EMG was accomplished with Myosystem Br-1 equipment with 12 bits, amplified with gain of 5000, sampled at 2000 Hz, with band of 10-1000 Hz. For measuring the EMG amplitude, the root mean square (RMS), measured in μV. The pattern of body posture was evaluated through Computerized Biophotogrametry (Alcimage software). In order to analyze the results the statistic t of Student text was used. With the obtained results is possible to conclude that there wasn t statistically significant difference of the means values in RMS in the masticatory and cervical electrical activity muscles, when comparing the symptomatic and non symptomatic individuals of TMD. However, concerning the analysis of body posture, the symptomatic group presented statistically significant difference regarding to the non symptomatic group in some marked points, like: forward head, round shoulders and trunk rotation. The non symptomatic group presented difference statistically significant with regarding to the symptomatic group in the points of shoulders height and lower extremity s length.