Wen Aonan, Xiao Ning, Zhu Yujia, Gao Zixiang, Qin Qingzhao, Shan Shenyao, Li Wenbo, Sun Yuchun, Wang Yong, Zhao Yijiao
Center of Digital Dentistry/Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology, Beijing 100081, China.
Department of Stomatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.
Polymers (Basel). 2024 Apr 12;16(8):1083. doi: 10.3390/polym16081083.
(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.
(1) 背景：牙科实践中有多种3D打印机可供使用；然而，缺乏一种能有效指导从业者的全面准确性评估方法。本体外研究旨在基于一种特殊的结构化牙科模型，提出一种优化方法来评估由光聚合树脂制成的3D打印牙科模型的空间真实性，并给出六台3D打印机的初步评估结果。(2) 方法：基于先前研究报道的牙冠和牙弓测量数据，设计了一个包含多种几何结构的结构化牙科模型。在这个原始模型上可以直接测量96个特征尺寸，将人工测量误差降至最低。使用六种类型的光固化3D打印机，包括采用Polyjet技术的Objet30 Pro、采用Multijet技术的Projet 3510 HD Plus、采用DLP技术的Perfactory DDP和DLP 800d、采用SLA技术的Form2和Form3，以及各打印机各自的3D可打印牙科模型材料，分别制作一组物理模型。针对模拟牙冠和牙弓的特征尺寸，记录线性测量值。将扫描的数字模型与设计数据进行比较，并测量3D形状误差（包括整体3D偏差、平面度、平行度和垂直度误差）。(3) 结果：使用Objet30 Pro打印的模型总体3D偏差最低（总值：45μm），Form3打印的模型平面度误差最低（0.061±0.019mm），Objet30 Pro打印的模型平行度误差最低（0.138±0.068°），Projet 3510 HD Plus打印的模型垂直度误差最低（0.095±0.070°）。在色差图中，观察到打印模型中有不同的变形模式。对于Objet30 Pro制作的模型，特征尺寸最为准确（咬合平面误差：0.02±0.36%，咬合龈向误差：-0.06±0.09%）。(4) 结论：作者研究了一种基于结构化牙科模型评估光聚合树脂3D打印牙科模型空间真实性的新方法。该方法能够客观、全面地评估3D打印牙科模型的空间真实性，具有良好的重复性和通用性。
