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Sagittal split ramus osteotomy (SSRO) is commonly used for treatment of mandibular prognathism. This study evaluated masseter muscle activity using electromyography device, in patients with mandibular prognathism before and after bilateral SSRO of the mandible. Twelve prognathic patients (five males and seven females; mean age 20.6 years) were examined. Initial phase of orthodontic treatment was completed in all included patients. Electromyographic activity of masseter muscle was recorded during maximum voluntary clenching as follows: First evaluation: 7 days prior to surgery, second evaluation: 3 months after surgery and third evaluation: 6 months after surgery. Electromyography quantities were significantly decreased 3 months after surgery. Electromyographic activity of masseter muscle was recovered to the preoperative level 6 months after bilateral SSRO of the mandible. SSRO of the mandible is a safe technique for correction of mandibular prognathism and not seriously affects masticatory muscle electromyographic activity.

Electromyographic Analysis of Masseter Muscle after Surgical Correction of Mandibular Prognathism