目的: 通过CBCT三维重建方法评价上颌快速扩弓后牙根体积及长度吸收变化情况.方法: 选取33例需要进行上颌快速扩弓治疗的患者,于扩弓前后分别拍摄CBCT影像,使用Mimics软件对第一、第二前磨牙及第一磨牙进行三维重建,并依次测量的其治疗前后牙根体积及长度值,最后采用SPSS软件对数据进行统计学分析.结果: 扩弓结束后,所有牙根体积均所有减少(P ＜ 0. 05),支抗牙多于非支抗牙(P ＜ 0. 05);除第一磨牙近中颊根、远中颊根长度减小外(P ＜ 0. 05),其余牙根长度未见明显变化(P＞ 0. 05).结论: 快速扩弓后牙根均会发生一定程度的吸收,并且这种吸收是以体积变化为主.%Objective: To evaluate the change of tooth root volume and length after rapid maxillary expansion by CBCT three dimensional reconstruction method. Methods: 33 patients underwent rapid maxillary expansion were examined by CBCT before and after treatment. The CBCT images of the first,second premolars and the first molars were segmented and reconstructed by Mimics image processing software for the analysis of the changes of root volume and length. All data were analyzed by SPSS software statistically. Results: After maxillary expansion,all root volumes were reduced(P ＜ 0. 05),more reduction was observed in anchorage teeth than in non-anchorage teeth(P ＜ 0. 05). The length of most teeth roots was not decreased(P＞ 0. 05) except the buccal and distal roots of the first molars(P ＜ 0. 05). Conclusion: Rapid maxillary expansion may result in root resorption and this resorption is mainly based on the volume decrease.
展开▼
