Short-term changes in muscle activity and jaw movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry
김경아, 박홍식, 이수연, 김수정, 백승학, 안효원,
소속 상세정보
김경아 ( Kim Kyung-A ) - Kyung Hee University School of Dentistry Department of Orthodontics
박홍식 ( Park Hong-Sik ) - Kyung Hee University Graduate School Department of Dentistry
이수연 ( Lee Soo-Yeon ) - Kyung Hee University Graduate School Department of Dentistry
김수정 ( Kim Su-Jung ) - Kyung Hee University School of Dentistry Department of Orthodontics
백승학 ( Baek Seung-Hak ) - Seoul National University School of Dentistry Department of Orthodontics
안효원 ( Ahn Hyo-Won ) - Kyung Hee University School of Dentistry Department of Orthodontics
Abstract
Objective: To evaluate the short-term changes in masticatory muscle activity and mandibular movement patterns after orthognathic surgery in skeletal Class III patients with facial asymmetry.
Methods: Twenty-seven skeletal Class III adult patients were divided into two groups based on the degree of facial asymmetry: the experimental group (n = 17 [11 male and 6 female]; menton deviation ≥ 4 mm) and control group (n = 10 [4 male and 6 female]; menton deviation < 1.6 mm). Cephalography, electromyography (EMG) for the anterior temporalis (TA) and masseter muscles (MM), and mandibular movement (range of motion [ROM] and average chewing pattern [ACP]) were evaluated before (T0) and 7 to 8 months (T1) after the surgery.
Results: There were no significant postoperative changes in the EMG potentials of the TA and MM in both groups, except in the anterior cotton roll biting test, in which the masticatory muscle activity had changed into an MM-dominant pattern postoperatively in both groups. In the experimental group, the amount of maximum opening, protrusion, and lateral excursion to the non-deviated side were significantly decreased. The turning point tended to be shorter and significantly moved medially during chewing in the non-deviated side in the experimental group.
Conclusions: In skeletal Class III patients with facial asymmetry, the EMG activity characteristics recovered to presurgical levels within 7 to 8 months after the surgery. Correction of the asymmetry caused limitation in jaw movement in terms of both ROM and ACP on the non-deviated side.
키워드
Class III orthognathic surgery; Facial asymmetry; Electromyography; Jaw movement
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