Análise eletromiográfica e da força do músculo masseter em indivíduos com distintos padrões craniométricos / Electromyographic analysis and strength of the masseter muscle in individuals with distinct craniometric patterns

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

30/01/2012

RESUMO

Surface electromyography is a hardware that supports a deeper study about pathologies in areas that works with the muscular movement. Several studies reports that subjects with distinct craniometrical patterns may exhibit different movement functions. Thirty one subjects were analysed, divided in three groups (09 dolichocephalics, 14 mesocephalics and 08 brachicephalics), genders masculine and feminine, between 18 and 28 years old, Angle s class I, healthy, no presence of temporomandibular disfunction, bruxism, clenching or dental agenesis. The cranial dimensions were taken with the anthropometrical Willis s compass. To the investigation was performed surface electromyography in the masseter muscle and a bite transducer positioned in all teeth to get the biofeedback of the oclusal forces. All volunteers were instructed to implement and maintain an oclusal force of 20 Kgf for 5 seconds. To analyze the mean amplitude of electromyographic signal and the muscular force was calculated the Root Mean Square (RMS) value. For each group were related the RMS value in the volunteer muscular contraction movement and implement of oclusal force and the values of the mastication movements were compared. With the data it was concluded that there is significant differences in individuals Angle s class I with different craniometrical patterns. In this study the dolichocephalic group was capable to prosecute and maintain a superior oclusal force than the two other groups, however the RMS value plus elevated, suggesting a higher muscular effort. The brachicephalic group prosecuted and maintained a little below oclusal force value than the instructed, however with the mean RMS value closer to the mesocephalic group, who exerted less force. It may suggest a better use of the muscular energy and higher muscular force stability during the submaximal voluntary contraction in the brachicephalic group.

ASSUNTO(S)

circunferência craniana eletromiografia força de mordida cephalometry electromyography bite force

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