The craniofacial musculature has been cited as a possible etiologic factor in the development of malocclusions and relapse after orthodontic therapy. This study was designed to compare electromyography activity between orbicularis oris and mentalis muscles in Cl I and cl II deep bite cases during function and rest
Methods:
20 adults were selected in this study (10 with cl I and 10 with cl II deep bite). Their age and gender feature were matched. Samples were positioned in natural head position. Integrated electromyography activity of the orbicularis oris and mentalis muscles at rest, maximum intercuspation, during clenching and swallowing was recorded into a computer based system using surface bipolar electrodes. Statistical test (Kolmogorov-Smirnove, Mann-Whitney) were conducted to compare the results.
Results:
No statistically significant difference was found between the electromyography activities of the orbicularis oris and mentalis muscles at maximum intercuspation, during clenching and swallowing (p>0.05). Muscle activity of the group with malocclusion at rest position was more than that the other group but this difference was not significant (p>0.05).
Conclusions:
According to the statistical inferences, electromyography activities of the orbicularis oris and mentalis muscles do not have significant differences during functional stages and rest between adults with Cl I and Cl II deep bite.