Department of Conservative Dentistry with Endodontics, Wrocław Medical University, Wrocław, Poland.
Department of Dietetics and Food Science, Wrocław Medical University, Wrocław, Poland.
Med Sci Monit. 2023 Aug 3;29:e940922. doi: 10.12659/MSM.940922.
BACKGROUND This study aimed to compare fused deposition modeling (FDM) and digital light processing (DLP) techniques in terms of dimensional accuracy for printing dental models used for the manufacture of clear dental aligners. MATERIAL AND METHODS Based on the intraoral scan of an adult patient, a sequence of 10 aligner models was created using BlueSkyPlan4. The test models (n=30) were fabricated with 2 desktop 3D printers: (DLP) and (FDM) printers. Two groups of samples were created (digitized using a desktop optical scanner). To calculate trueness (n=20) and precision (n=10), printed models were compared to the source files (REF). REF, DLP, and FDM files were superimposed and converted to point clouds. The cloud-to-cloud distances were calculated using CloudCompare software. Using the same algorithm, distortions of models were measured. Data were analyzed using one-way ANOVA and Tukey's post hoc test. RESULTS Significant differences were found between the trueness and precision of DLP and FDM groups. The average calculated trueness of DLP and FDM was 0.096 mm (0.021) (P<0.001) and 0.063 mm (0.024) (P<0.001), respectively. The average calculated precision of DLP and FDM was 0.027 mm (0.003) (P<0.001) and 0.036 mm (0.003) (P<0.001), respectively. A widening (0.158 mmfor DLP and 0.093 mmfor FDM, P=0.05) and twisting (0.03 mmfor DLP and 0.043 mmfor FDM, P=0.05) of the printed models was observed. CONCLUSIONS Both printers had sufficient precision for aligner models manufacturing. FDM showed a higher trueness and this device can be applied as an alternative to DLP. Polymerization shrinkage is a significant factor in decreasing the trueness of DLP printers.
本研究旨在比较熔融沉积成型（FDM）和数字光处理（DLP）技术在打印用于制造透明牙矫正器的牙科模型的尺寸精度方面的差异。
基于成人患者的口腔内扫描，使用 BlueSkyPlan4 制作了 10 个牙矫正器模型序列。使用 2 台桌面 3D 打印机（DLP 和 FDM 打印机）制造测试模型（n=30）。创建了两组样本（使用桌面光学扫描仪数字化）。为了计算准确性（n=20）和精度（n=10），将打印模型与源文件（REF）进行比较。REF、DLP 和 FDM 文件被叠加并转换为点云。使用 CloudCompare 软件计算云到云之间的距离。使用相同的算法，测量模型的变形。使用单因素方差分析和 Tukey 事后检验对数据进行分析。
发现 DLP 和 FDM 组的准确性和精度存在显著差异。DLP 和 FDM 的平均计算准确性分别为 0.096 毫米（0.021）（P<0.001）和 0.063 毫米（0.024）（P<0.001）。DLP 和 FDM 的平均计算精度分别为 0.027 毫米（0.003）（P<0.001）和 0.036 毫米（0.003）（P<0.001）。观察到打印模型的宽度增加（DLP 为 0.158 毫米，FDM 为 0.093 毫米，P=0.05）和扭曲（DLP 为 0.03 毫米，FDM 为 0.043 毫米，P=0.05）。
两种打印机都具有足够的精度来制造矫正器模型。FDM 的准确性更高，因此可以作为 DLP 的替代方案。聚合收缩是降低 DLP 打印机准确性的一个重要因素。
