Assistant professor, Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex.
Am J Orthod Dentofacial Orthop. 2013 Dec;144(6):831-7. doi: 10.1016/j.ajodo.2013.08.014.
The aim of this study was to assess the diagnostic accuracy and surface matching characteristics of 3-dimensional digital dental models obtained from various sources.
Three sets of maxillary and mandibular digital models of 30 subjects were included in this study. Three-dimensional stereolithography model files were obtained from a 3-dimensional laser desktop scanner (Ortho-Insight 3D; Motionview Software, Hixson, Tenn), the emodel system (GeoDigm, Chanhassen, Minn), and cone-beam computerized tomography. Arch-length discrepancy measurements were made on the 3-dimensional digital models and compared with direct caliper measurements. Additionally, stereolithography files from the 3 digital model systems were paired and superimposed using a best-fit algorithm. Average linear differences between the stereolithography shells were computed together with surface correlation amounts at various tolerance levels. Data were evaluated using intraclass correlation coefficients and the Tukey mean difference test.
Although all 3 digital model groups displayed good correlation with caliper measurements, the virtual scan models had the highest correlation with the manual method (ICC > 0.95). The Tukey mean difference test showed no consistent bias of one approach vs the others compared with caliper measurements; random errors were detected in all the comparisons. For the estimation of arch-length discrepancy, the mean bias of the scanned virtual models in comparison with caliper measurements (0.24 ± 0.67 mm) was smaller than the mean biases of the emodels and the models generated from cone-beam computed tomography. Additionally, the best surface overlap correlation was observed between the virtual scanned models and the emodels. The mean linear distances between the stereolithography shells of these 2 model systems were 0.14 and 0.13 mm for the maxillary and mandibular arches, respectively.
All 3 digital model systems can provide diagnostic information similar to caliper measurements, with varying degrees of agreement limits. The scanned virtual models had the least mean bias. A strong surface match correlation was observed between the virtual scanned models and the emodels, indicating that these could be used interchangeably.
本研究旨在评估从不同来源获取的 3 维数字牙模的诊断准确性和表面匹配特性。
本研究纳入了 30 名受试者的上颌和下颌 3 套数字模型。通过 3 维激光桌面扫描仪（Ortho-Insight 3D；Motionview Software，Hixson，Tenn）、eModel 系统（GeoDigm，Chanhassen，Minn）和锥形束计算机断层扫描获得 3 维立体光刻模型文件。在 3 维数字模型上进行牙弓长度差异测量，并与直接卡尺测量进行比较。此外，使用最佳拟合算法对 3 种数字模型系统的立体光刻文件进行配对和叠加。计算立体光刻外壳之间的平均线性差异以及在不同容差水平下的表面相关量。使用组内相关系数和 Tukey 均值差异检验对数据进行评估。
虽然所有 3 种数字模型组与卡尺测量均显示出良好的相关性，但虚拟扫描模型与手动方法的相关性最高（ICC>0.95）。Tukey 均值差异检验显示，与卡尺测量相比，一种方法与其他方法之间没有一致的偏差；在所有比较中均检测到随机误差。对于牙弓长度差异的估计，与卡尺测量相比，扫描虚拟模型的平均偏差（0.24±0.67mm）小于 emodel 和锥形束计算机断层扫描生成模型的平均偏差。此外，在虚拟扫描模型和 emodel 之间观察到最佳的表面重叠相关性。这 2 种模型系统的立体光刻外壳之间的平均线性距离分别为上颌和下颌 0.14mm 和 0.13mm。
所有 3 种数字模型系统都可以提供与卡尺测量相似的诊断信息，具有不同程度的一致性限制。扫描虚拟模型的平均偏差最小。在虚拟扫描模型和 emodel 之间观察到很强的表面匹配相关性，表明这两种模型可以互换使用。
