Three dimensional measurements of tooth root resorption after rapid maxillary expansion

VernacularTitle:上颌快速扩弓后牙根吸收变化的三维测量研究
Author: Zaidao XIONG ¹ ; Guizhi ZHAO ; Jie KE ; Qinghua LIN ; Xinming YANG ; Yihan XIAO
Author Information

1. 中国人民解放军空军总医院
Keywords: Rapid maxillary expansion; Root resorption; CBCT
From: Journal of Practical Stomatology 2018;34(1):65-68
CountryChina
Language:Chinese
Abstract: 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.