Department of Public Health Science, Graduate School, Korea University, Seoul, Korea.
Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Korea.
J Prosthodont. 2019 Feb;28(2):e557-e562. doi: 10.1111/jopr.12928. Epub 2018 Jul 2.
To evaluate the accuracy (trueness and precision) of dental replica models produced by using photopolymer materials in additive manufacturing.
A complete arch model was scanned using an extraoral scanner (Identica Blue) and established as reference. For the control group, 10 stone models were acquired through the conventional method from the reference model. For the experimental groups, digital data were acquired using an intraoral scanner (CEREC Omnicam), and 10 stereolithographic apparatus (SLA) models and 10 PolyJet models were made. All models were scanned with an extraoral scanner. Three-dimensional analysis software was used to measure differences between the 3D scanned images in root mean square values. The ISO-5725-1 specification was followed to measure trueness and precision between two 3D scanned data. Trueness was calculated by overlapping scanned data with the reference model and precision by performing pairwise intragroup comparisons. Also the ratio of region out of tolerance (> ±50 μm) was measured. One-way ANOVA and Tukey's post hoc analysis were applied.
There was no statistically significant difference in trueness between the stone and the SLA models (p > 0.05). Dental replica models using photopolymer materials showed statistically significantly better precision than that of the stone model (p < 0.05). Regarding tolerance, no statistically significant difference was observed between the stone and the SLA models (p > 0.05).
Although the dental replica models using photopolymer materials did not show better trueness than the conventional stone models, there was no significant difference between the SLA and the stone models. Concerning precision, dental replica models using photopolymer materials presented better results than that of the conventional stone models. In sum, dental replica models using photopolymer materials showed sufficient accuracy for clinical use.
评估使用光聚合材料在增材制造中制作的牙模复制模型的准确性（准确性和精密度）。
使用口外扫描仪（Identica Blue）扫描完整的牙弓模型，并将其作为参考。对于对照组，通过从参考模型获得 10 个石模型来获得。对于实验组，使用口腔内扫描仪（CEREC Omnicam）获取数字数据，并制作 10 个立体光固化（SLA）模型和 10 个 PolyJet 模型。所有模型均使用口外扫描仪进行扫描。使用三维分析软件以均方根值测量三维扫描图像之间的差异。按照 ISO-5725-1 规范测量两个三维扫描数据之间的准确性和精密度。准确性是通过将扫描数据与参考模型重叠来计算的，而精密度是通过执行组内两两比较来计算的。还测量了超出公差（> ±50 μm）的区域比例。应用了单向方差分析和 Tukey 事后分析。
石模型和 SLA 模型之间的准确性没有统计学上的显著差异（p > 0.05）。使用光聚合材料的牙模复制模型的精密度明显优于石模型（p < 0.05）。关于公差，石模型和 SLA 模型之间没有观察到统计学上的显著差异（p > 0.05）。
虽然使用光聚合材料的牙模复制模型的准确性不如传统的石模型，但 SLA 模型和石模型之间没有显著差异。关于精密度，使用光聚合材料的牙模复制模型的结果优于传统的石模型。总之，使用光聚合材料的牙模复制模型具有足够的临床使用准确性。
