【摘要】 目的:评价自锁托槽和传统托槽在正畸治疗中对牙根外吸收的影响。方法:选取南京同仁医院口腔科矫治结束的固定正畸患者72例为研究对象,36例采用自锁托槽,36例采用传统托槽。对不同托槽组的临床资料进行描述性分析,并根据正畸治疗前后全颌曲面断层片和记存模型,测量计算出不同托槽的牙根外吸收量,进一步以牙根外吸收量为因变量,对临床相关因素包括托槽的类别、疗程、性别、减数与否、年龄进行回归分析。结果:两组患者间的疗程、性别、减数与否、年龄的临床统计资料,其两组间分布无差异;治疗疗程对牙根外吸收的影响有显著意义,自锁托槽在对牙根外吸收的影响方面与传统托槽相比有增加的趋势,但无统计学差异(P=0.06)。结论:无论是自锁托槽还是传统托槽,均可造成切牙根外吸收,治疗疗程对牙根外吸收的影响有显著意义,自锁托槽对正畸治疗过程中牙根外吸收的影响与传统托槽相比,有增加趋势,但无统计学差异。更多还原

【Abstract】 Objective:The aim was to retrospective investigate the amount of external apical root resorption(EARR) of maxillary incisors between conventional and passive self-ligating brackets.Method:72 patients were selected from a pool of 346 patients satisfying inclusion criteria,Patients received treatment with either a passive self-ligating bracket system or a conventional edgewise appliance.Demographic and clinical characteristics were investigated with conventional descriptive statistics.EARR of the maxillary incisors was evaluated on panoramic radiographs and Pretreatment dental casts,Statistical comparisons of EARR between appliance type,age,sex,extraction treatment,and duration of treatment were investigated with univariate and multivariate regression modeling.Result:no difference was found in the amount of EARR between appliance systems(P =0.06).Age,sex,and extraction treatment were not reliable predictors of EARR,but a positive association between EARR and duration of treatment was observed.Conclusion:No difference should be expected for root resorption between conventional and self-ligating brackets.更多还原