(1)背景:各种3D打印机可用于牙科实践;但是,缺乏有效指导从业人员的综合准确性评价方法。这项体外研究旨在提出一种优化的方法,以评估基于特殊结构化牙科模型的光敏聚合物树脂制成的3D打印牙科模型的空间真实性,并提供6台3D打印机的初步评估结果。(2)方法:基于先前研究报告的牙冠和牙弓测量数据,设计了包含几种几何构型的结构化牙模型。九十六个特征尺寸可以直接测量这个原始模型与最小的手动测量误差。六种类型的光固化3D打印机,包括使用Polyjet技术的Objet30Pro,使用Multijet技术的Projet3510HDPlus,PerfactoryDDP和DLP800d使用DLP技术,Form2和Form3使用SLA技术,和每个打印机各自的3D打印牙科模型材料,分别用于制作一组物理模型。关于模拟牙冠和牙弓的特征尺寸,记录线性测量值.扫描的数字模型与设计数据进行了比较,和3D形状误差(包括整体3D偏差;平面度,并行性,和垂直度误差)进行了测量。(3)结果:总体3D偏差最低,平整度,并行性,并注意到使用Objet30Pro打印的模型的垂直度误差(总体值:45μm),Form3(0.061±0.019mm),Objet30Pro(0.138±0.068°),和Projet3510HDPlus(0.095±0.070°),分别。在色差图中,在印刷模型中观察到不同的变形模式。对于Objet30Pro制造模型,特征尺寸被证明是最准确的(咬合平面误差:0.02±0.36%,齿龈方向误差:-0.06±0.09%)。(4)结论:作者研究了一种基于结构化牙科模型的由光敏树脂制成的3D打印牙科模型的空间真实性的新颖评估方法。该方法能够客观、全面地评价3D打印牙体模型的空间真实性,具有良好的可重复性和通用性。
(1) Background: Various 3D printers are available for dental practice; however, a comprehensive accuracy evaluation method to effectively guide practitioners is lacking. This in vitro study aimed to propose an optimized method to evaluate the spatial trueness of a 3D-printed dental model made of photopolymer resin based on a special structurized dental model, and provide the preliminary evaluation results of six 3D printers. (2) Methods: A structurized dental model comprising several geometrical configurations was designed based on dental crown and arch measurement data reported in previous studies. Ninety-six feature sizes can be directly measured on this original model with minimized manual measurement errors. Six types of photo-curing 3D printers, including Objet30 Pro using the Polyjet technique, Projet 3510 HD Plus using the Multijet technique, Perfactory DDP and DLP 800d using the DLP technique, Form2 and Form3 using the SLA technique, and each printer\'s respective 3D-printable dental model materials, were used to fabricate one set of physical models each. Regarding the feature sizes of the simulated dental crowns and dental arches, linear measurements were recorded. The scanned digital models were compared with the design data, and 3D form errors (including overall 3D deviation; flatness, parallelism, and perpendicularity errors) were measured. (3) Results: The lowest overall 3D deviation, flatness, parallelism, and perpendicularity errors were noted for the models printed using the Objet30 Pro (overall value: 45 μm), Form3 (0.061 ± 0.019 mm), Objet30 Pro (0.138 ± 0.068°), and Projet 3510 HD Plus (0.095 ± 0.070°), respectively. In color difference maps, different deformation patterns were observed in the printed models. The feature size proved most accurate for the Objet30 Pro fabricated models (occlusal plane error: 0.02 ± 0.36%, occlusogingival direction error: -0.06 ± 0.09%). (4) Conclusions: The authors investigated a novel evaluation approach for the spatial trueness of a 3D-printed dental model made of photopolymer resin based on a structurized dental model. This method can objectively and comprehensively evaluate the spatial trueness of 3D-printed dental models and has a good repeatability and generalizability.