曲面体层片与锥形束CT片对正畸治疗后牙根吸收率的比较性研究  

Comparison of apical root resorption after orthodontic treatment by using panoramic radiography and conebeam computed tomography

作　　者：赵健慧[1] 丁云[2] 

机构地区：[1]北京大学口腔医院第二门诊部正畸科,100101 [2]北京大学口腔医院第三门诊部正畸科

出　　处：《现代口腔医学杂志》2013年第2期78-81,共4页Journal of Modern Stomatology

摘　　要：目的对比曲面体层片和锥形束CT片检测正畸治疗后牙根吸收率的差异。方法应用CBCT及曲面体层片分别对30名青少年患者正畸治疗后前牙的牙根吸收状况进行研究,共359颗前牙,其中上切牙120颗,下切牙119颗,尖牙120颗。对两种方法的检测率进行统计学分析。结果曲面体层片的前牙牙根吸收率为33.7%,CBCT冠状断层面的牙根吸收率为14.5%,CBCT矢状断层面的牙根吸收率为29.5%,二者都与曲面体层片间有统计学差异且CBCT冠状和矢状面牙根吸收率差异也有统计学意义。结论曲面体层片对正畸治疗后前牙冠状面牙根吸收状况的判断存有较高的假阳性率,早期以及矢状向的牙根吸收只能由CBCT技术反映。CBCT能更加精确地从三维方向上反映牙根的吸收状况。Objective To compare panoramic radiography （OPT） and cone beam computed tomography （CBCT） in evaluating orthodontically induced anterior apical root resorption. Methods The sample comprised 359 anterior teeth in 30 adolescent patients after orthodontic treatment with fixed appliances. Two calibrated examiners assessed anterior apical root resorption on the OPT images and the corresponding reconstructed CBCT imagines. Resorption was evaluated according to Levander and Malmgren method. Results Statistically significant differences were found between the OPT and CBCT methods. 33.7%, 14.5% and 29.5% of root resorption were found by OPT, CBCT coronal section and CBCT sagittal section respectively. Conclusion Apical root resorption after orthodontic treatment is overestimated by OPT. Early and slanted root resorption can only be evaluated by CBCT. CBCT is a useful diagnostic method compared with conventional radiography.

关 键 词：锥形束CT 牙根吸收 正畸治疗 

分 类 号：R783.5[医药卫生—口腔医学]