Neuromuscular adaptations of superficial masseter and anterior temporalis muscle was compared, following treatment of class II div1 malocclusion in growing children, with flexible and rigid fixed functional appliances. It was observed that there was a significant decrease in the muscle activity at 4 weeks with both types of fixed functional appliances. The most significant and prominent difference between the two types of appliances was observed during maximum voluntary clenching, in which, the decrease in the muscle activity was more significant in subjects treated with rigid fixed functional appliance than those treated with flexible fixed functional appliance. This difference was attributed to faster occlusal contacts that were achieved in patients treated with flexible fixed functional appliance. In view of the decreased EMG activity observed in the present investigation, our findings are more consistent with the concept which assigns a major role to the viscoelastic elements of...

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