Comparison of the accuracy of virtual and direct bonding of orthodontic accessories

ABSTRACT Introduction: Conventional direct and indirect bonding techniques fail to obtain the ideal bracket position. Objective: To compare the accuracy of virtual and conventional direct bonding of orthodontic accessories. Methods: A single virtual configuration (dental mannequin with Class I malocclusion) served as basis for generating the reference model (treated virtually) and the intervention models (10 digital models and 10 solid models, obtained by means of prototyping). A total of 560 teeth were then equally distributed between a group of orthodontists (Group I, direct bonding; and Group II, virtual bonding), working in two different time intervals. The individual positions of the accessories were measured after three-dimensional superimposition with customized software. The Student’s-t test for paired samples, and Chi-square tests were used for statistical analysis, both at the level of significance of 5%. Results: In comparison of the errors in raw values, there were significant differences only in the vertical (p

摘要：
引言：传统直接与间接粘接技术均难以获得理想的托槽位置。
研究目的：比较正畸附件（orthodontic accessories）虚拟粘接与传统直接粘接的精度。
研究方法：以单组虚拟模型（安氏Ⅰ类错𬌗（Class I malocclusion）的牙科仿真模型）为基准，分别生成参照模型（经虚拟处理）与干预模型（通过原型制作技术获得10个数字模型与10个实体模型）。随后将共计560颗牙齿平均分配至两组正畸医师操作组：第Ⅰ组采用传统直接粘接，第Ⅱ组采用虚拟粘接，两组分别在两个不同的时间区间内完成操作。通过定制化软件完成三维叠加后，测量各附件的个体位置偏差。统计分析采用配对样本Student’s t检验与卡方检验，显著性水准设定为5%。
结果：在原始误差值的比较中，仅在垂直向存在显著性差异（p