Atividade dos Músculos Masseteres e Temporais: Eletromiografia Integrada e Força de Mordida Pré e Pós Cirurgia Ortognática. / Activity of the masseter and temporal muscles before and after orthognathic surgery: integrated electromyography and bite force measures.

AUTOR(ES)

Ana Claudia Martins Sampaio

DATA DE PUBLICAÇÃO

2000

RESUMO

Objective: To investigate the effect of the orthognathic surgery on the integrated electromyographic (IEMG) activity of the masticatory muscles and on the maximum isometric bite force (MIBF) and to analyze if these parameters reach normal values following surgery. Design: IEMG activity and bite force were measured before orthognathic surgery (PRE) and 3 to 9 months after (POST). Differences were considerated significant at a level of 5%. Setting: Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru. Patients: Sixteen patients with malocclusion and 11 individuals with normal dental occlusion, used as controls. Interventions: Le Fort I osteotomy. Main outcome measures: 1) IEMG activity of the masseter and temporal muscles measured during maximum isometric voluntary clench (MIVC), and voluntary and rhythmic percussion of the teeth (VRPT), and 2) MIBF, measured bilaterally in the area of the 1st and 2nd premolars. Results: During MIVC and VRPT activities the masseter IEMG activity in the group of patients with malocclusion was smaller at PRE and POST, temporal IEMG activity was smaller only at PRE, when compared to the normal group. MIBF was smaller at PRE and POST. Median value observed at POST during MIVC and VRPT activities was significantly small from PRE for the temporal muscle. No significant difference was observed between PRE and POST values for the masseter muscle. MIBF on the right side at POST was smaller that at PRE; no differences were seen on the left side. Conclusions: The orthognathic surgery modified the temporal muscle IEMG activity and MIBF recorded on the right side of the dental arch, however, normal muscular function was not achieved after surgery.

ASSUNTO(S)

cirurgia ortognática eletromiografia electromyography bite force força de mordida orthognathic surgery

Documentos Relacionados

• Eletromiografia dos músculos temporais e masseteres em pacientes com disfunção temporomandibular tratados com placa interoclusal
• ELECTROMYOGRAPHY OF SURFACE OF THE MASSETER AND TEMPORAL MUSCLES IN SUBJECTS WITH BRUXISM
• Relações entre potenciais elétricos dos músculos temporais e masseteres, força de mordida e índice morfológico da face
• Análise eletromiográfica dos músculos temporal e masseter e força de mordida em indivíduos com disfunção temporomandibular muscular antes e após tratamento com acupuntura
• Análise eletromiográfica dos músculos masseter e temporal, força de mordida e eficiência mastigatória em indivíduos com esquizofrenia e com transtornos do humor, medicados, comparados com indivíduos sadios e não medicados