根管治疗牙正畸加力后根吸收的相关因素研究

Effect of orthodontic treatment on root shape in endodontically treated teeth

目的研究固定正畸治疗对根管治疗牙牙根吸收的影响和相关因素分析。方法选择正畸治疗前口腔内已完善根管治疗牙45例，利用治疗前后的全口曲面断层片，以改良根吸收分级法评估患者治疗前后牙根形态变化，分析正畸治疗对根管治疗后牙根吸收的影响。结果①正畸治疗后根管治疗牙牙根吸收有所增加，差异具有统计学意义（P〈0．001）；②性别是影响正畸治疗后根管治疗牙牙根吸收方程最为显著的因素（P〈0．05），提示女性发生根吸收的风险大于男性；③正畸治疗后根管治疗牙与对侧活髓牙比较牙根吸收程度的改变差异没有统计学意义（P〉0．05）；④在所观察的样本中，无论根管治疗牙齿与活髓牙均未见3级根吸收。结论根管治疗牙在固定正畸治疗后可能发生一定程度的根吸收改变，但并不比活髓牙的风险更高。

Objective To evaluate the clinical characters of root shape after orthodontic treatment among endodontically treated teeth. Methods Forty-five orthodontic patients were selected who had a tooth treated endodontically before initiation of the orthodontic movement. The panoramic radiographs before and after orthodontic treatment were examined. Measurements were made by comparing the root resorption score taken before and after the orthodontic treatment. Results （1） There was great statistically significant difference （P 〈 0. 001） in apical root resorption after orthodontic treatment in the endodontically treated teeth compared to before initiation of orthodontic movement. （2） A positive association between apical root resorption and gender was observed in the patients with endodontieally treated teeth and female was more dangerous when exposed to orthodontic loading. （3） There was no statistically difference in apical root resorption between endodontically treated teeth and natruai teeth.（4） No root resorption score up to third degree was observed in selected cases. Conclusions After orthodontic treatment root resorption was common both in endodontically treated teeth and natural teeth, There was no significant difference between therm.