Ueki Koichiro, Marukawa Kohei, Shimada Mayumi, Nakagawa Kiyomasa, Yamamoto Etsuhide
Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan.
J Oral Maxillofac Surg. 2007 Aug;65(8):1562-8. doi: 10.1016/j.joms.2006.10.071.
To assess skeletal stability after mandibular setback surgery with and without an intermaxillary fixation (IMF) screw.
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.
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.
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.
评估下颌后缩手术中使用和不使用颌间固定（IMF）螺钉时的骨骼稳定性。
研究对象为40例下颌前突患者。这些患者接受了钛板固定的下颌升支矢状劈开截骨术，并被分为两组，一组使用IMF螺钉，另一组不使用。术前、术后即刻、术后1个月、3个月和6个月拍摄头颅侧位片。然后对两组进行统计学比较。
通过重复测量方差分析比较两组的时间进程变化，在咬合平面（组间，F = 2.517；自由度 = 4；P = 0.0437）和凸度（组间，F = 4.048；自由度 = 4；P = 0.0038）方面存在显著差异。然而，在其他测量指标上没有显著差异。
本研究表明，在大多数测量中，使用和不使用IMF螺钉的两组在时间进程的骨骼变化方面没有显著差异。然而，IMF螺钉作为颌间固定的刚性锚钉，对正颌手术有帮助。
