成年人正畸治疗中上前牙牙根吸收的CBCT研究

目的：本研究使用三维影像CBCT进行评价旨在提高正畸治疗中牙根吸收的精确性。方法：选取进行正畸拔牙治疗的患者10例，并在治疗前和治疗12个月分别拍摄CBCT，测量治疗前后上颌6个牙齿的长度（双侧中切牙、侧切牙和尖牙），计算得出牙根吸收的数值。结果：所有测量牙齿治疗前后牙根长度比较均有统计学意义（P〈0.05）。牙吸收量最大为上颌侧切，左右侧分别为：1.13 mm和1.14 mm；其次为上颌双侧中切牙，左右侧分别为：0.97 mm和0.96 mm；上颌双侧尖牙吸收最少，左右侧分别为0.87 mm和0.95 mm。结论：（1）结果显示正畸拔牙矫正患者治疗中有一个明显的牙根吸收。（2）本研究证实使用CBCT评价牙根吸收是一个有效而且精确的方法。

Study of CBCT for Root Resorption of the Anterior Teeth of Maxillary During Adult Orthodontic Treatment

To evaluate the correlations between root resorption during orthodontic treatment using cone-beam computed tomography（CBCT）.Method：10 patients who treated for orthodontic tooth were selected, and measured the root resorption around six teeth（bilateral maxillary central incisors,lateral incisors,and canines） by using CBCT,before orthodontic treatment and after 12 months treatment,the correlation was calculated between root resorption.Result：The length of all measuring tooth root were compared before and after treatment,and the differences were statistically significant（P〈0.05）. The root resorption was largest in the maxillary lateral incisors, the left and right lateral incisors were 1.13 mm and 1.14 mm respectively;followed by the maxillary central incisors, the left and right central incisors were 0.97 mm and 0.96 mm;and then was the maxillary canines,the left and right canines were 0.87 mm and 0.95 mm.Conclusion：（1）The patients have an obvious root absorption in the treatment of orthodontic tooth orthodontic.（2）This study has demonstrated that CBCT is a useful approach for evaluating apical root resorption after orthodontic treatment.