The use of an intermaxillary fixation screw for mandibular setback surgery. |
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Authors: | Koichiro Ueki Kohei Marukawa Mayumi Shimada Kiyomasa Nakagawa Etsuhide Yamamoto |
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Institution: | Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp |
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Abstract: | PURPOSE: To assess skeletal stability after mandibular setback surgery with and without an intermaxillary fixation (IMF) screw. PATIENTS AND METHODS: The subjects were 40 patients with mandibular prognathism. The subjects underwent sagittal split ramus osteotomy with titanium plate fixation and were divided into 2 groups, 1 with and 1 without an IMF screw. A lateral cephalogram was done preoperatively, immediately after surgery, and 1 month, 3 months, and 6 months postoperatively. The 2 groups were then compared statistically. RESULTS: In the comparison of the time-course change between the 2 groups with repeated measure analysis of variance, there were significant differences in occlusal plane (between subjects, F = 2.517; df = 4; P = .0437) and convexity (between subjects, F = 4.048; df = 4; P = .0038). However, there was no significant difference in the other measurements. CONCLUSION: This study suggested that in most measurements, there was no significant difference between 2 groups with and without an IMF screw in time-course skeletal change. However, use of IMF screws was helpful for orthognathic surgery as a rigid anchor of IMF. |
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