Postgraduate student, Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
Junior researcher, Department of Orthodontics and Craniofacial Biology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
Am J Orthod Dentofacial Orthop. 2014 Sep;146(3):328-36. doi: 10.1016/j.ajodo.2014.05.026.
The aim of this study was to determine the reproducibility and accuracy of linear measurements on 2 types of dental models derived from cone-beam computed tomography (CBCT) scans: CBCT images, and Anatomodels (InVivoDental, San Jose, Calif); these were compared with digital models generated from dental impressions (Digimodels; Orthoproof, Nieuwegein, The Netherlands). The Digimodels were used as the reference standard.
The 3 types of digital models were made from 10 subjects. Four examiners repeated 37 linear tooth and arch measurements 10 times. Paired t tests and the intraclass correlation coefficient were performed to determine the reproducibility and accuracy of the measurements.
The CBCT images showed significantly smaller intraclass correlation coefficient values and larger duplicate measurement errors compared with the corresponding values for Digimodels and Anatomodels. The average difference between measurements on CBCT images and Digimodels ranged from -0.4 to 1.65 mm, with limits of agreement values up to 1.3 mm for crown-width measurements. The average difference between Anatomodels and Digimodels ranged from -0.42 to 0.84 mm with limits of agreement values up to 1.65 mm.
Statistically significant differences between measurements on Digimodels and Anatomodels, and between Digimodels and CBCT images, were found. Although the mean differences might be clinically acceptable, the random errors were relatively large compared with corresponding measurements reported in the literature for both Anatomodels and CBCT images, and might be clinically important. Therefore, with the CBCT settings used in this study, measurements made directly on CBCT images and Anatomodels are not as accurate as measurements on Digimodels.
本研究旨在确定从锥形束 CT（CBCT）扫描获得的两种类型的牙模的线性测量值的重现性和准确性：CBCT 图像和解剖模型（InVivoDental，加利福尼亚州圣何塞）；并将其与来自牙印模的数字模型（Digimodels；荷兰乌得勒支的 Orthoproof）进行比较。Digimodels 用作参考标准。
从 10 名受试者中制作了 3 种类型的数字模型。4 名检查者重复 37 次线性牙齿和弓测量，每次测量 10 次。进行配对 t 检验和组内相关系数分析，以确定测量值的重现性和准确性。
CBCT 图像的组内相关系数值明显较小，重复测量误差较大，与 Digimodels 和解剖模型的相应值相比。在牙冠宽度测量中，CBCT 图像与 Digimodels 之间的平均差异范围为-0.4 至 1.65mm，一致性界限值高达 1.3mm。解剖模型与 Digimodels 之间的平均差异范围为-0.42 至 0.84mm，一致性界限值高达 1.65mm。
在 Digimodels 和解剖模型之间以及在 Digimodels 和 CBCT 图像之间发现了测量值存在统计学显著差异。虽然平均差异可能在临床可接受范围内，但与文献中报道的解剖模型和 CBCT 图像的相应测量值相比，随机误差相对较大，可能具有临床意义。因此，在本研究中使用的 CBCT 设置下，直接在 CBCT 图像和解剖模型上进行的测量不如在 Digimodels 上进行的测量准确。
