CBCT观察快慢速扩弓牙齿移动方式的异同

Similarities and Differences of Tooth Movement after Rapid or Slow Maxillary Expansion Observed by CBCT

目的:比较生长发育高峰期牙弓狭窄者快慢速扩弓治疗后牙齿的移动方式。方法:选取处于生长发育高峰期牙弓狭窄者40例,随机分为2组,应用CBCT成像技术对扩弓前后进行扫描并三维重建,测量牙齿及腭中缝的变化并做统计分析。结果:快速扩弓组牙冠间距离较慢速扩弓组增加小,牙根间距离增加大,具有统计学差异(P<0.05)。结论:上颌扩弓治疗牙齿发生整体移动和倾斜移动,快速扩弓组中牙齿整体移动大于慢速扩弓组。

Objectives： To compare the differences of teeth movement after rapid maxillary expansion or slow maxillary expansion in teenagers. Methods： Forty patients in the growth peak with narrow arch were selected. They were randomly divided into two groups. CBCT imaging technique was used to scan and reconstruct the arch before and after maxillary expansion. The changes of teeth and palate were measured and analyzed statistically. Results： For rapid expansion group, the increase of gap between the crowns was smaller and the increase of gap between the roots was bigger than those of slow expansion group （P〈0.05）. Conclusion： During maxillary expansion, the teeth have both whole movement and tilt movement. The whole movement in the rapid expansion group was greater than that of the slow expansion group.