下颌角弧形截骨术对咀嚼功能的影响

The influence on masticatory function after curved osteotomy of prominent mandibula＇s angle

目的 通过对下颌角弧形截骨手术前后咬合力的研究,分析手术对咀嚼功能的影响,从而进一步指导临床.方法 对2008年1至10月行下颌角弧形截骨术的20例女性患者（年龄16～38岁）手术前后切牙区、双侧前磨牙区、双侧磨牙区最大咬合力进行测定,比较手术前及术后6个月时咬合力的变化.结果 术前前牙区、右侧前磨牙区、左侧前磨牙区、右侧磨牙区、左侧磨牙区最大咬合力分别为：（11.7±3.9）kg、（23.2±1.6）kg、（30.9±2.3）kg、（35.6±4.2）kg、（38.5±3.1）kg.术后6个月测定的最大咬合力分别为：（11.9±2.1）kg、（23.0±4.5）kg、（31.0±1.8）kg、（35.9±3.5）kg、（38.5±2.7）kg,各牙区最大咬合力达到甚至略高于术前水平.术后6个月与术前比较差异无统计学意义（P〉0.05）.结论 下颌角弧形截骨手术对最大咬合力及咀嚼功能无明显影响.

Objective To investigate the influence of mandibuiar curved osteotomy on masticatory function by analyzing the bite force before and after operation. Methods From Jan. to Oct. 2008, 20 female cases underwent mandibuiar curved osteotomy. The maximal bite force in incisor area, bilateral premolar area and molar area was measured before operation and 6 months after operation. Results The maximal bite force in incisor area, right premolar area, left premolar area, right molar area, left molar area was （11.7 ±3.9） kg、（23.2 ± 1.6）kg、 （30.9 ±2.3） kg、 （35.6 ±4.2） kg、 （38.5 ±3.1） kg, respectively before operation; and was （11.9 ±2. 1） kg、 （23. 0 ± 4. 5） kg, （31. 0 ± 1. 8） kg, （35.9 ± 3.5） kg、 （38.5 ±2.7） kg, respectively 6 months after operation. The postoperative maximal bite force reached the preoperative level, and even slightly above it. There was no significant difference between the measured data before operation and 6 months afterward （ P 〉 0. 05 ） . Conclusions The curved osteotomy of prominent mandibuiar angle has no long-term effect on masticatory function.