Yoo Soo-Yeon, Kim Seong-Kyun, Heo Seong-Joo, Koak Jai-Young, Kim Joung-Gyu
Department of Prosthodontics and Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea.
Sense Dental Laboratory, 1104, Seoul Soop IT-Valley, 77, Seongsuil-ro, Seongdong-gu, Seoul 04790, Korea.
Materials (Basel). 2021 Mar 22;14(6):1550. doi: 10.3390/ma14061550.
Previous studies on accuracy of three-dimensional (3D) printed model focused on full arch measurements at few points. The aim of this study was to examine the dimensional accuracy of 3D-printed models which were teeth-prepped for three-unit fixed prostheses, especially at margin and proximal contact areas. The prepped dental model was scanned with a desktop scanner. Using this reference file, test models were fabricated by digital light processing (DLP), Multi-Jet printing (MJP), and stereo-lithography apparatus (SLA) techniques. We calculated the accuracy (trueness and precision) of 3D-printed models on 3D planes, and deviations of each measured points at buccolingual and mesiodistal planes. We also analyzed the surface roughness of resin printed models. For overall 3D analysis, MJP showed significantly higher accuracy (trueness) than DLP and SLA techniques; however, there was not any statistically significant difference on precision. For deviations on margins of molar tooth and distance to proximal contact, MJP showed significantly accurate results; however, for a premolar tooth, there was no significant difference between the groups. 3D color maps of printed models showed contraction buccolingually, and surface roughness of the models fabricated by MJP technique was observed as the lowest. The accuracy of the 3D-printed resin models by DLP, MJP, and SLA techniques showed a clinically acceptable range to use as a working model for manufacturing dental prostheses.
以往关于三维（3D）打印模型准确性的研究主要集中在少数几个点的全牙弓测量上。本研究的目的是检验为制作三单位固定义齿而进行牙体预备的3D打印模型的尺寸准确性，尤其是在边缘和邻面接触区域。使用桌面扫描仪对预备好的牙齿模型进行扫描。利用该参考文件，通过数字光处理（DLP）、多喷射打印（MJP）和立体光刻设备（SLA）技术制作测试模型。我们计算了3D打印模型在三维平面上的准确性（真实性和精确性），以及在颊舌向和近远中平面上各测量点的偏差。我们还分析了树脂打印模型的表面粗糙度。对于整体三维分析，MJP显示出比DLP和SLA技术显著更高的准确性（真实性）；然而，在精确性方面没有任何统计学上的显著差异。对于磨牙边缘的偏差和到邻面接触的距离，MJP显示出显著准确的结果；然而，对于前磨牙，各组之间没有显著差异。打印模型的三维彩色图显示在颊舌向有收缩，并且观察到用MJP技术制作的模型表面粗糙度最低。通过DLP、MJP和SLA技术制作的3D打印树脂模型的准确性在临床上可接受，可作为制作牙科修复体的工作模型使用。
