Discipline of Orthodontics, School of Dentistry, University of Queensland, Brisbane, QLD 4000, Australia.
Am J Orthod Dentofacial Orthop. 2013 Aug;144(2):304-10. doi: 10.1016/j.ajodo.2013.04.011.
The objectives of this study were to determine the validity, reliability, and reproducibility of the iOC intraoral scanner (Cadent, Carlstadt, NJ) and its associated OrthoCAD software (Cadent) in measuring tooth widths and deriving Bolton ratios.
Thirty subjects had impressions taken of their teeth and rendered as stone casts. In addition, their mouths were scanned with the iOC and the scans were converted into digital models. Tooth widths were measured with a digital caliper from the physical models and with the OrthoCAD software from the virtual models. Bolton ratios were derived using the data from each method. Validity was assessed with a paired t test, reliability with the Pearson correlation coefficient, and reproducibility with the intraclass correlation coefficient.
Although there were statistically significant differences between mean tooth widths (P = 0.0083) and Bolton ratios (P = 0.0354 and P <0.0001) with the 2 methods, the discrepancies were deemed to be clinically insignificant. The Pearson r for tooth-width replications was 0.99 for both techniques, and all intraclass correlation coefficient values exceeded 87%.
The iOC/OrthoCAD system can be used to measure tooth widths and calculate Bolton ratios with clinically acceptable accuracy and excellent reliability and reproducibility. It appears to be a sound orthodontic aid.
本研究的目的是确定 iOC 口内扫描仪（Cadent，Carlstadt，NJ）及其相关 OrthoCAD 软件（Cadent）在测量牙齿宽度和得出 Bolton 比率方面的有效性、可靠性和可重复性。
30 名受试者的牙齿被印模并制成石模型。此外，他们的口腔也用 iOC 进行了扫描，并将扫描转换为数字模型。使用数字卡尺从物理模型测量牙齿宽度，并使用 OrthoCAD 软件从虚拟模型测量牙齿宽度。使用每种方法的数据得出 Bolton 比率。采用配对 t 检验评估有效性，采用 Pearson 相关系数评估可靠性，采用组内相关系数评估可重复性。
虽然两种方法之间的平均牙齿宽度（P=0.0083）和 Bolton 比率（P=0.0354 和 P<0.0001）存在统计学显著差异，但差异被认为临床意义不大。两种技术的牙宽复制 Pearson r 均为 0.99，所有组内相关系数值均超过 87%。
iOC/OrthoCAD 系统可用于测量牙齿宽度和计算 Bolton 比率，具有可接受的临床准确性、出色的可靠性和可重复性。它似乎是一种合理的正畸辅助工具。
