Damon Q自锁托槽在数字化牙颌模型上的模拟定位研究

目的 探讨数字化托槽模拟定位的准确性。方法 对15例数字化牙颌模型上的牙齿（每例28颗）进行托槽模拟定位，定位方法分别采用托槽高度定位法和含牙根信息托槽定位法。采用OrthoRx软件形成矫治后的最终状态；采用美国正畸目标评分系统（ABO-OGS）评估矫治结果，测量指标包括牙齿排齐、后牙边缘嵴高度及牙根平行度3项。结果 1）虚拟矫治后两种托槽定位方法的边缘嵴高度扣分均小于治疗前（P<0.05），但两种方法虚拟矫治后边缘嵴高度扣分没有统计学差异（P>0.05）。2）含牙根信息托槽定位法虚拟矫治后牙根平行度扣分小于托槽高度定位法，但两种方法虚拟矫治前后牙根平行度未发生明显改善。3）在牙齿排齐及3项总扣分方面，两种托槽定位方法在虚拟矫治前后扣分的差异有统计学意义，矫治后扣分均小于治疗前，含牙根信息托槽定位法矫治后的扣分小于托槽高度定位法（P<0.05）。结论 在重建的包含牙根的三维数字化模型上，采用OrthoRx软件，通过托槽高度定位法及含牙根信息定位法进行托槽定位，模拟矫治均有效果；通过含牙根信息托槽定位法的模拟矫治效果更好。

Preliminary study on positioning of Damon Q self-ligating brackets in a digital integration model

Objective This study was performed to determine the feasibility of digital virtual positioning of braces in clinical applications. Methods We determined the positions of brackets in 28 teeth of 15 cases according to positioning methods that use bracket height or root information. Final status was generated by OrthoRx software. Treatment results were assessed with American board of orthodontics objective grading system (ABO-OGS). Results The deduction points in the marginal ridge height were significantly decreased after treatment using the two methods (P<0.05). However, no statistically significant difference was found in the deduction points in the marginal ridge height between the two methods (P>0.05). No improvement was found in the deduction points in root parallelism with both methods. No statistical significance was found in the deduction points in root parallelism before and after treatments using both methods. The deduction points in alignment and the three scoring components were significantly decreased after treatment using the two positioning methods. In addition, statistically significant differences were found in the deduction points in alignment between two methods (P<0.05). Conclusion By using OrthoRx software, we achieved effective therapeutic treatment in reconstructing three-dimensional digital modes using two different bracket-positioning methods. The positioning method that used root information is more accurate compared with the bracket height positioning method. This study provides an experimental basis for bracket accuracy in the mouth.