Camardella Leonardo Tavares, de Vasconcellos Vilella Oswaldo, Breuning Hero
Department of Orthodontics, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil.
Department of Orthodontics, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil.
Am J Orthod Dentofacial Orthop. 2017 Jun;151(6):1178-1187. doi: 10.1016/j.ajodo.2017.03.012.
The aim of this study was to compare the accuracy of printed models from intraoral scans with different designs of model bases, using 2 types of 3-dimensional printing techniques.
Three types of model base design were created: regular base, horseshoe-shaped base, and horseshoe-shaped base with a bar connecting the posterior region. The digital models were printed with the 3-dimensional printers using different techniques: stereolithography and triple jetting technology (polyjet). The printed models were then scanned with a computed tomography scanner and a desktop laser scanner to create the respective digital models. Evaluation of the accuracy was done by measuring the dentitions with Ortho Analyzer software (3Shape, Copenhagen, Denmark) and by model superimposition with Geomagic Qualify software (3D Systems, Rock Hill, SC). An observer measured the distances twice, with an interval of 2 weeks. The accuracy of the printed models was statistically evaluated by the mixed-effects regression model approach.
The results showed that printed models made by the polyjet printer were accurate, regardless of the design of the model base. Printed models made with the stereolithography technique with the regular model base and the horseshoe-shaped base with a bar were accurate, but the transversal distances measured on the printed models with a horseshoe-shaped base were statistically significantly smaller.
Printed models with a regular base or a horseshoe-shaped base with a bar were accurate regardless of the printing technique used. Printed models with a horseshoe-shaped base made with the stereolithography printer had a statistically significant reduction in the transversal dimension that was not found in the models printed with the polyjet technique.
本研究的目的是使用两种三维打印技术，比较不同模型底座设计的口内扫描打印模型的准确性。
创建了三种模型底座设计：常规底座、马蹄形底座以及带有连接后部区域横杆的马蹄形底座。使用不同技术通过三维打印机打印数字模型：立体光刻和三喷射技术（Polyjet）。然后使用计算机断层扫描仪和台式激光扫描仪对打印模型进行扫描，以创建各自的数字模型。使用Ortho Analyzer软件（丹麦哥本哈根3Shape公司）测量牙列，并使用Geomagic Qualify软件（美国南卡罗来纳州罗克希尔3D Systems公司）进行模型叠加，以此评估准确性。一名观察者进行了两次测量，间隔为2周。通过混合效应回归模型方法对打印模型的准确性进行统计学评估。
结果表明，无论模型底座设计如何，由Polyjet打印机制作的打印模型都是准确的。使用立体光刻技术制作的带有常规模型底座和带有横杆的马蹄形底座的打印模型是准确的，但在带有马蹄形底座的打印模型上测量的横向距离在统计学上显著较小。
无论使用何种打印技术，带有常规底座或带有横杆的马蹄形底座的打印模型都是准确的。使用立体光刻打印机制作的带有马蹄形底座的打印模型在横向尺寸上有统计学上的显著减小，而在使用Polyjet技术打印的模型中未发现这种情况。
