[摘要] 目的 探究上颌切牙内收后牙根吸收情况及上颌切牙移动方向与牙根吸收间的相关性。 方法 选取2008年 9月～2011年12月于哈尔滨医科大学附属第四医院就诊的12～22岁正畸患者60例为研究对象，均为安氏Ⅱ1类，在正畸治疗前后分别拍摄平行投照根尖片及头颅侧位定位片，测量上颌切牙的牙根长度、中切牙唇倾度、切缘点位移及根尖点不同方向的位移。采用Wilcoxon秩和检验和多重线性回归进行统计学分析。 结果 治疗后，96.4%的切牙存在不同程度的牙根吸收，侧切牙吸收程度高于中切牙(P < 0.05)。多重线性回归分析显示，伸长、压低及UI-PP角对牙根吸收程度有影响(P < 0.05)。 结论 侧切牙较中切牙牙根受力后更易吸收；牙齿的伸长、压低及根舌向转矩均会导致牙根吸收量增加，而牙齿的水平位移及总位移无此影响。

    [关键词] 牙根吸收；上颌切牙；牙齿移动

    [中图分类号] R783.5 [文献标识码] A [文章编号] 1673-7210(2016)04(c)-0125-04

    [Abstract] Objective To investigate the degree of root resorption and relationship between movement direction and root resorption after maxillary incisor adduction. Methods 60 orthodontic patients with Angle class Ⅱ division 1 in the Fourth Affiliated Hospital of Harbin Medical University from September 2008 to December 2011 were selected as study objects. The age ranged from 12 to 22 years old. Parallel periapical radiographs of the maxillary incisors and cephalograms were obtained at pre-treatment and post-treatment. The length of the maxillary incisor tooth root ......