Electromyographic Evaluation of Anterior Temporal and Suprahyoid Muscles Using Habitual Methods to Determine Clinical Rest Position

Abstract

The purpose of this study was to compare the electromyographic (EMG) activity of the anterior temporal and suprahyoid muscles using habitual methods to determine the clinical rest position. The sample included 26 healthy subjects with natural dentition, bilateral molar support, and bilateral molar Angle Class I occlusion. Bipolar surface electrodes were located on the right anterior temporal and suprahyoid muscles for EMG recordings. In each subject EMG activity was recorded while standing while performing the following jaw posture tasks: during light occlusal contact in the intercuspal position; during and after pronouncing the word Mississippi, during and after pronouncing the Spanish terms Sesenta y seis (English translation: sixty six); during and after pronouncing the word, business, during and after swallowing of saliva; and while maintaining their mandible in a relaxed posture. Anterior temporal EMG activity in the intercuspal position was significantly higher than all the other conditions. The same was observed in the suprahyoid muscles excepting after pronouncing the words Mississippi, and business. EMG activity recorded in the clinical rest position by means of phonetic methods, swallowing of saliva and maintaining the mandible in a relaxed posture did not show a significant difference. From an EMG point of view any of these methods could be used to determine clinical rest position.

Surface electromyographic evaluation of jaw muscles in children with unilateral crossbite and lateral shift in the early mixed dentition. Sexual dimorphism

“…At rest position, no sex differences have been reported in sEMG activity of AT and MA in normo-occlusive adults (22,23,26). …”

Estudo da função do músculo temporal e dos músculos supra-hióideos por meio da eletromiografia de superfície em diferentes classes esqueléticas

“…isto pelo motivo que nessa região a pele superficial ao músculo não apresenta cabelo. Estudos de função mastigatória (Gonzales e Bérzin, 2003), Deglutição (Falda et al, 1988), determinação da posição de repouso mandibular (Fresno et al, 2007) e fadiga (Sforza et al, 2007), foram realizados avaliando a atividade eletromiográfica da porção anterior do músculo temporal.…”