Electromyography activity of masseter and temporal muscles in individual with different vertical facial types / Atividade eletromiografica dos musculos masseter e temporal em individuos com diferentes tipos faciais verticais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The influence of masticatory muscles over the facial morphology is important to comprehend the normal growth and the manifest of morphological anomalies. The objective of this study was to evaluate the electromyographic activity of masseter and temporal muscles among individuals with different vertical facial types. The sample was composed by forty-four volunteers of both genders ranging from 18 to 35 years of age. Cephalometrics measures in lateral teleradiographs and multivariate statistical analysis were used to classify the volunteers according with their vertical facial dimensions in three groups: brachyfacial (Group 1), mesofacial (Group 2) and dolicofacial (Group 3). Beside this, the volunteers were submitted to an electromyographic examination to register the activity of masseter and anterior portion of temporal muscles bilaterally. The Kolmogorov- Smirnov and Levene tests were applied to verify variance normality and homogeneity. ANOVA and Kruskal-Wallis test identified statistical differences among the studied groups for data that presented and not normal and homogeny distribution, respectively. All statistical tests were performed with 5% of significance level (p <0.05). For rest evaluation only the right temporal and masseter muscles presented statistically significant differences among the groups. The differences were observed between Groups 1 and 2 (p = 0.02) and 1 and 3 (p = 0.038) for the right temporal muscle; and between Groups 1 and 2 (p = 0.029) for the right masseter muscle. Generally, group 1 presented the lowest electromyographic values for the four muscles evaluated during rest. For isotonic, none of the muscles presented statistically significant difference among the groups. For the analyzed sample, it could be concluded that the different vertical facial types do not determine distinct patterns of electromyographic activity to masseter and anterior portion of temporal muscles during the rest and the bilateral mastication.

ASSUNTO(S)

electroneuromyography cephalometry morfologia morphology cefalometria eletromiografia

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