关闭曲法和滑动法对牙根吸收影响的比较研究

Comparison of root resorption between T loop technique and sliding technique of orthodontic treatment

目的:比较关闭曲法和滑动法对牙根吸收的影响。方法:随机选取利用MBT直丝弓矫治技术治疗的安氏I类错畸形拔牙病例90例,其中关闭曲法45例,滑动法45例,治疗前后拍摄全颌曲面断层片和根尖片,用根吸收分级评估法记录其矫治前后全口牙根吸收的情况,统计分析。结果:在正畸治疗后关闭曲法和滑动法的牙根吸收发生率无显著差异(P>0.05),2种方法在治疗后的牙根吸收发生率都增大(P<0.05)。牙根吸收主要发生在上下颌切牙,下颌牙较上颌牙多见(P>0.05)。结论:关闭曲法和滑动法在安氏I类错矫治拔牙病例中对牙根吸收的影响无差别。

Objective：To Compare root resorption between T loop technique and sliding technique of orthodontic treatment.Meth-ods：90 patients with Angle class I malocclusion were orthodontically treated by MBT fixed appliances with T loop technique（n =45） and sliding technique（n =45）respectively.Root resorption of the patients were examined by grading evaluation method with orthopan-tomography and periapical films before and after orthodontic treatment.Results：After orthodontic treatment the tooth root resorption rate increased（P 〈0.05）,the root resorption rate was not significantly different between T loop technique group and sliding technique group（P 〉0.05）.Root resorption mostly occurred in the incisors,especially in mandibular tooth.Conclusion：There is no difference of the effect of root resorption between T loop technique and sliding technique of orthodontic treatment in patients with Angle class I malocclusion.