Caracterização eletromiográfica e ultrassonográfica da função mastigatória em indivíduos com oclusão normal

Abstract

OBJETIVO: Caracterizar o controle motor dos músculos masseter e temporal e a morfologia do músculo masseter em atividades da função mastigatória em indivíduos com oclusão normal; verificar a compatibilidade entre os exames de eletromiografia de superfície (EMGs) e ultrassonografia (USG). MÉTODOS: Participaram 22 indivíduos adultos, de ambos os gêneros, sem alterações no sistema miofuncional orofacial. Os procedimentos adotados para avaliação dos participantes foram: EMGs dos músculos masseteres (MM) e temporais (MT); e USG dos MM, na realização de três tarefas - repouso muscular, apertamento dentário com algodão, apertamento dentário sem algodão. RESULTADOS: Para análise estatística dos dados foram utilizados os testes de Kolmogorv-Smirnov, teste-T pareado e Correlação de Spearman, com nível de significância de 5%. Na EMGs observou-se diferença entre a ativação de MM e MT no apertamento dentário com e sem algodão, sendo MT mais ativo que MM em ambas as tarefas. Não foram observadas diferenças entre as hemifaces, tanto na EMGs quanto na USG. Observou-se também correlação positiva entre os exames na condição de apertamento dentário sem algodão esquerdo e na condição de apertamento dentário esquerdo com algodão, e tendência à significância no apertamento dentário direito sem algodão. CONCLUSÃO: A associação da EMGs e USG na investigação da funcionalidade muscular traz importantes informações sobre fisiologia da musculatura esquelética. Os resultados do presente estudo indicam haver correlação entre a EMGs e a USG, ou seja, o aumento da atividade elétrica e o aumento correspondente da espessura do músculo.

Surface Electromyography of Masseter and Temporal Muscles With Use Percentage While Chewing on Candidates for Gastroplasty

“…The technique used and the guidelines were previously explained to the patient for data collection protocols already published 9 , 14 , 16 , 23 , 26 . During habitual mastication, it was standardized as food, a portion of french bread 5 cm 3 and signal capture time during chewing; they were analyzed in all ranges without exclusions, taking advantage of the total sample time until swallowing food.…”

“…The records were collected by MHI maintained for 5 seconds and repeat three times with 1 min interval addition to rest between each collection and used the average for signal normalization, equivalent to 100% of the electrical activity. The signals collected during mastication were analyzed by Root Mean Square (RMS) and expressed in microvolts (uV) 9 , 14 , 26 .…”

Orofacial and cervical myofunctional intervention programmes for older adults: A scoping review

“…Instrumental assessments are quantitative and complement the clinical diagnosis of orofacial myofunctional disorders. 40,42,43 The portable ultrasound is a morphometric instrument used to assess the thickness of the orofacial muscles and identify the tongue movements involved in chewing, swallowing, and speech. 44,45 SEMG and IOPI are electrophysiological instruments used, respectively, to pick up the electrical activity of the orofacial and cervical muscles during rest, in a maximal isometric contraction, and specific tasks of stomatognathic functions, 42,43 and to measure tongue pressure in elevation, protrusion, lateralization, swallowing, and resistance.…”

“…40,42,43 The portable ultrasound is a morphometric instrument used to assess the thickness of the orofacial muscles and identify the tongue movements involved in chewing, swallowing, and speech. 44,45 SEMG and IOPI are electrophysiological instruments used, respectively, to pick up the electrical activity of the orofacial and cervical muscles during rest, in a maximal isometric contraction, and specific tasks of stomatognathic functions, 42,43 and to measure tongue pressure in elevation, protrusion, lateralization, swallowing, and resistance. 44 Instrumental evaluations allow for better clarity as to the anatomy and physiology of the systems involved and the number of activities performed (biofeedback) -however, effective therapeutic planning requires a broad and careful clinical orofacial myofunctional evaluation based on the anatomical and functional conditions of the SS.…”

Caracterização miofuncional orofacial e eletromiográfica de pacientes submetidos à correção da fratura condilar por redução aberta e fechada

“…All surface electromyography (sEMG) exams were conducted by the same speech-language pathologist under the same environmental conditions. Assessment of the electric activity of masticatory muscles of the participants was based on specific methodology (18) . To this end, the sEMG was performed using a 4-channel Miotool 400 electromyography device with all channels calibrated as follows: at 500 microvolts (μV) with a bandpass filter (20-500 Hz), a notch filter (60 Hz), and 100x gain, with low noise level (<5 μV RMS).…”