Electromyographic evaluation during masticatory function, in patients with temporomandibular disorders following interocclusal appliance treatment.

The aim of this study was to evaluate the electromyographic activity during masticatory function, in patients with stomatognathic system dysfunctions, treated with interocclusal splints. Electromyography was carried out through a computer diagnostic system K6-l DIAGNOSTIC SYSTEM (Myo-Tronics, Inc.; Tukwila, WA; USA). Study sample involved 20 individuals, age 18-53 years, both genders. Electromyographic activity of the masticatory muscles (masseter and anterior temporalis) was measured before and 90, 120, and 150 days after treatment with interocclusal splints, which were modified at days 90 (in canine guidance) and 120 (in group function). Data were statistically analyzed through a simple linear regression model. There was no statistically significant difference (p > 0.05) among the 3 periods assessed. Bilateral equilibrium of electromyographic activity was observed for the masseter and anterior temporalis muscles during the treatment.