Kim Jooseong, Lagravére Manuel O
Department of Dentistry, School of Dentistry, University of Alberta, Edmonton, Canada.
Korean J Orthod. 2016 Jan;46(1):13-9. doi: 10.4041/kjod.2016.46.1.13. Epub 2016 Jan 25.
The aim of this study was to compare the accuracy of Bolton analysis obtained from digital models scanned with the Ortho Insight three-dimensional (3D) laser scanner system to those obtained from cone-beam computed tomography (CBCT) images and traditional plaster models.
CBCT scans and plaster models were obtained from 50 patients. Plaster models were scanned using the Ortho Insight 3D laser scanner; Bolton ratios were calculated with its software. CBCT scans were imported and analyzed using AVIZO software. Plaster models were measured with a digital caliper. Data were analyzed with descriptive statistics and the intraclass correlation coefficient (ICC).
Anterior and overall Bolton ratios obtained by the three different modalities exhibited excellent agreement (> 0.970). The mean differences between the scanned digital models and physical models and between the CBCT images and scanned digital models for overall Bolton ratios were 0.41 ± 0.305% and 0.45 ± 0.456%, respectively; for anterior Bolton ratios, 0.59 ± 0.520% and 1.01 ± 0.780%, respectively. ICC results showed that intraexaminer error reliability was generally excellent (> 0.858 for all three diagnostic modalities), with < 1.45% discrepancy in the Bolton analysis.
Laser scanned digital models are highly accurate compared to physical models and CBCT scans for assessing the spatial relationships of dental arches for orthodontic diagnosis.
本研究旨在比较使用Ortho Insight三维（3D）激光扫描仪系统扫描的数字模型所获得的Bolton分析准确性与从锥形束计算机断层扫描（CBCT）图像和传统石膏模型所获得的准确性。
从50名患者获取CBCT扫描和石膏模型。使用Ortho Insight 3D激光扫描仪扫描石膏模型；用其软件计算Bolton比率。导入CBCT扫描并用AVIZO软件进行分析。用数字卡尺测量石膏模型。用描述性统计和组内相关系数（ICC）分析数据。
通过三种不同方式获得的前牙Bolton比率和总Bolton比率显示出极好的一致性（>0.970）。扫描数字模型与物理模型之间以及CBCT图像与扫描数字模型之间总Bolton比率的平均差异分别为0.41±0.305%和0.45±0.456%；前牙Bolton比率分别为0.59±0.520%和1.01±0.780%。ICC结果表明，检查者内误差可靠性总体极好（所有三种诊断方式均>0.858），Bolton分析中的差异<1.45%。
与物理模型和CBCT扫描相比，激光扫描数字模型在评估正畸诊断中牙弓的空间关系方面具有高度准确性。
