J Korean Assoc Maxillofac Plast Reconstr Surg.
2005 May;27(3):259-266.
Electromyographic analysis of the masseter and anterior temporalis muscle after orthognathic surgery of patients with facial asymmetry
- Affiliations
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- 1Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University, Korea. shalee@knu.ac.kr
- 2Division of Oral and Maxillofacial Surgery, Department of Dentistry, Daegu Fatima Hospital, Korea.
Abstract
- The function of the masseter and anterior temporal muscles was assessed by electromyography in 30 patients with mandibular prognathism (20 patients with facial asymmetry and 10 patients without facial asymmetry) before orthognathic surgery and 4 weeks afterwards. Electromyogram (EMG) recordings were made during resting, clenching and swallowing. We compared with right-left difference of this recording and asymmetry index before and after orthognathic surgery. The result of this study was as follows. 1. There was no significant right-left difference in muscle activities of masticatory muscles both asymmetric groups and controls and many variable change after orthognathic surgery. (p>0.05) 2. The mean electric activity of the masticatory muscles was found to have decreased during more clenching than resting, but there was no statistically significant difference because of individual difference of measuring values. (p>0.05) 3. The asymmetry index of masticatory muscles in asymmetric groups was significantly greater during clenching compared with controls. (p<0.05) In conclusion, no right-left difference of muscle activities was found in patients with facial asymmetry before orthognathic surgery and 4weeks afterwards. Not only muscular functioning but also many other factors, such as occlusion, temporomandibular joint disorder and trauma, probably affect facial asymmetry and will be analyzed in future studies. And we will need long term follow-up after orthognathic surgery.
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