Electromyographic study of the orbicularis oris muscle, superior segment (medial region) in children with Class I malocclusion and mouth breathing mode

Gisele Zattar POVH, Luiz Renato ESSENFELDER, Roberto Hideo SHIMIZU, Hiroshi MARUO, Orlando TANAKA

Mouth breathing has long been stated to cause serious effects on the development of craniofacial skeleton and occlusion of the teeth, on account of the imbalanced relationship between external and internal muscles forces of the stomatognathic system. Surface electrodes were used to study the function of the orbicularis oris muscle, superior segment (medial region) in subjects with Class I malocclusion and mouth breathing mode. Brazilian 88 leucoderms children, 49 males and 39 females, with average age of 6 years and 11 months, were distributed in 4 subgroups according to occlusal type and mode of breathing. No significant statistical difference was observed between the subgroups for all the electromyographic variables analysed. Therefore, the mode of breathing and the occlusal type were not able to influence the muscular function studied in this sample.

Keywords: Electromyography. Diagnosis. Mouth breathing. Orbicularis oris.

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