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Doctoral Thesis
Full name
Ana Claudia Martins Sampaio
Knowledge Area
Date of Defense
Bauru, 2000
Trindade Junior, Alceu Sergio (President)
Capelozza Filho, Leopoldino
Castro, Joao Cesar Bedran de
Genaro, Katia Flores
Westphalen, Fernando Henrique
Title in Portuguese
Atividade dos Músculos Masseteres e Temporais: Eletromiografia Integrada e Força de Mordida Pré e Pós Cirurgia Ortognática.
Keywords in Portuguese
cirurgia ortognática
força de mordida
Abstract in Portuguese
Objetivo: Investigar o efeito da cirurgia ortognática sobre a atividade eletromiográfica integrada (EMGI) dos músculos mastigatórios e a força de mordida isométrica máxima (FMIM) e analisar se estes parâmetros alcançam níveis normais após a cirurgia. Modelo: Os pacientes foram avaliados antes da cirurgia ortognática (PRÉ) e 3 a 9 meses após (PÓS). Diferenças foram consideradas significantes ao nível de 5%. Ambiente/Local: Laboratório de Fisiologia, Hospital de Reabilitação de Anomalias Craniofaciais, Universidade de São Paulo, Bauru. Pacientes/Participantes: Dezesseis pacientes com mal-oclusão dentária e 11 indivíduos com oclusão dentária normal (controle). Intervenções: Os pacientes submeteram-se à osteotomia do tipo Le Fort I Variáveis: 1) Atividade EMGI dos músculos masseteres e temporais na contração voluntária isométrica máxima (CVIM) e na percussão voluntária e rítmica dos dentes (PVRD); 2) FMIM medida, bilateralmente, na região dos 1º e 2º premolares. Resultados: Comparativamente ao grupo controle, na CVIM e na PVRD, a atividade EMGI do músculo masseter nos pacientes foi menor no PRÉ e no PÓS, a atividade do músculo temporal foi menor no PÓS e a FMIM foi menor no PRÉ e no PÓS. Na CVIM e na PVRD, os valores no PÓS foram significantemente menores no músculo temporal, comparativamente ao PRÉ, não ocorrendo o mesmo com o músculo masseter. A FMIM no lado direito foi menor no PÓS, comparativamente ao PRÉ, não sendo observadas diferenças no lado esquerdo. Conclusões: A cirurgia ortognática modificou a atividade EMG do músculo temporal e a FMIM do lado direito, entretanto, a função muscular não normalizou após a cirurgia.
Title in English
Activity of the masseter and temporal muscles before and after orthognathic surgery: integrated electromyography and bite force measures.
Keywords in English
bite force
orthognathic surgery
Abstract in English
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.
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