Sfondrini Maria Francesca, Gariboldi Federica, Cerri Michael, Todaro Claudia, Pascadopoli Maurizio, Casiraghi Giulia, Scribante Andrea
Unit of Orthodontics and Pediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy.
Private Practice, 29011 Borgonovo Val Tidone, Italy.
Materials (Basel). 2025 Jun 26;18(13):3029. doi: 10.3390/ma18133029.
Three-dimensional printing is rapidly growing in applied dentistry. In order to print faster, increase workflow, and minimize the consumption of resin material, it is important to use the right printer and the correct printing orientation. The objective of the present report is to analyze the flexural strength of specimens realized with two different dental light-curing resins (Keyguide and C&B) obtained from two different Digital Light Processing (DLP) 3D printers. Different printing orientations (0°, 45°, and 90°) were evaluated. 3D Builder, MeshMixer, RayWare, and Chitubox software were used to design the resin specimens. A total of 15 Keyguide and 15 C&B specimens in the shape of a rectangular parallelepiped, with dimensions of 2 mm × 2 mm × 25 mm, were obtained with the Sprintray Moonray S 3D printer, and the 15 Keyguide and 15 C&B specimens presented the same characteristics as those printed using the Moon Night printer. Prior to sample printing, a calibration protocol (tolerance test and dimensional accuracy test) was performed using RayWare software. This procedure allowed compensation for resin shrinkage or expansion, thus ensuring dimensional consistency in all printed samples. Each resin specimen, after printing and post-processing (MoonWash 2 and MoonLight 2), was subjected to a mechanical test with a universal testing machine. After breaking the specimen, the flexural strength values were recorded with computer software (Bluehill, Instron Corporation, Canton, MA, USA). According to the results obtained, the printing orientation of the specimens does not affect the flexural strength of the two materials examined. However, at the maximum load, some differences emerged for both materials printed with the Moon Night printer, depending on their build angle. Both light-cured resins tested had a higher maximum load resistance when printed with the newer Moon Night printer. This result could be due to the Moon Night printer's better construction characteristics compared to those of the Sprintray or to issues related to the dimensional calibration of the specimens.
三维打印在口腔医学应用中发展迅速。为了实现更快打印、提高工作流程效率并减少树脂材料消耗，选择合适的打印机和正确的打印方向很重要。本报告的目的是分析使用两种不同的牙科光固化树脂（Keyguide和C&B）通过两台不同的数字光处理（DLP）3D打印机制作的试样的抗弯强度。评估了不同的打印方向（0°、45°和90°）。使用3D Builder、MeshMixer、RayWare和Chitubox软件设计树脂试样。使用Sprintray Moonray S 3D打印机获得了总共15个长方体形状、尺寸为2mm×2mm×25mm的Keyguide试样和15个C&B试样，并且这15个Keyguide试样和15个C&B试样与使用Moon Night打印机打印的试样具有相同的特性。在样品打印之前，使用RayWare软件执行了校准协议（公差测试和尺寸精度测试）。此过程可补偿树脂的收缩或膨胀，从而确保所有打印样品的尺寸一致性。每个树脂试样在打印和后处理（MoonWash 2和MoonLight 2）后，使用万能试验机进行力学测试。在试样破坏后，使用计算机软件（Bluehill，美国马萨诸塞州坎顿市英斯特朗公司）记录抗弯强度值。根据所得结果，试样的打印方向不影响所研究的两种材料的抗弯强度。然而，在最大载荷下，使用Moon Night打印机打印的两种材料根据其构建角度出现了一些差异。两种测试的光固化树脂在使用较新的Moon Night打印机打印时具有更高的最大抗载荷能力。这一结果可能是由于Moon Night打印机相比Sprintray具有更好的构造特性，或者与试样的尺寸校准问题有关。
