两种3D打印导板在托槽间接粘接中的准确性比较

目的:评估两种3D打印导板在辅助托槽间接粘接时准确性的差异。方法:利用离体牙按照牙弓形态排牙，标记测量点建立实验模型备用。通过数字化扫描仪获取数字化模型，利用计算机软件设计3D打印整段式和单牙位导板。通过制作的间接粘接导板将托槽转移定位到实验模型，测量标记点与托槽特定位点间距离，对转移前后距离的变化进行统计学分析。结果:通过配对t检验分析,整段式和单牙式两种3D打印导板在托槽转移前后位置变化差值分别为（0.21±0.05） mm、（0.22±0.05） mm，两者无统计学差异（P>0.05）。结论:在上述实验条件下，两种3D打印导板在辅助托槽间接粘接过程中准确性无明显差异。

Comparison of the accuracy of bracket placement between two kinds of 3D printed guide plates in indirect bonding

Abstract: Objective To evaluate the difference in the accuracy of bracket placement between two kinds of 3D printed guide plates in assisting indirect orthodontic bracket bonding. Methods The experimental model was established by arranging in vitro teeth according to dental arch form and marking measurement points, and then its digital model was obtained through a digital scanner. Two kinds of 3D printed guide plates, namely 3D printed whole-section and single-tooth guide plates, were designed by computer software. The brackets were transferred to the experimental model through the manufactured guide plates for indirect bonding. The distances between the markers and the specific positions of the bracket were measured, and the changes of the distances before and after the transfer were statistically analyzed. Results The results of paired t-test analysis showed that the deviations in the position changes of the whole-segment and single-tooth 3D printed guides before and after bracket transfer were (0.21±0.05) mm and (0.22±0.05) mm, respectively. There was no statistical difference in bracket placement accuracy in two kinds of 3D printed guide plates (P>0.05). Conclusion Under the above experimental conditions, two kinds of 3D print guide plates in assisting indirect orthodontic bracket bonding have similar accuracy of bracket placement.