Department of Oclusion, Prosthesis and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil; Department General Practice, School of Dentistry, Virginia Commonwealth University, Richmond, VA, United States.
Department of Oclusion, Prosthesis and Dental Materials, School of Dentistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
Dent Mater. 2023 Aug;39(8):686. doi: 10.1016/j.dental.2023.06.002. Epub 2023 Jun 23.
This in vitro comparative study aimed to evaluate the physical and mechanical properties of four 3D-printed resins with two different thickness layers.
Four printed resins (VarseoSmile Crown Plus, VSC; NexDent C&B MFH, MFH; Nanolab 3D, NNL; and Resilab 3D Temp, RSL) were printed with 50 µm and 100 µm layer thickness, resulting in 80 bars measuring 25 × 2×2 mm. The specimens underwent a Raman spectroscopy for degree of conversion, confocal laser scanning microscopy for surface roughness (Sa), three-point bending test for flexural strength and elastic modulus, and a Vickers hardness test (VHN). Data was tested for normality using the Shapiro-Wilk, two-way ANOVA, and Tukey test (α = 0.05) for statistical analysis.
The layer thickness affected all performed tests, but the elastic modulus (p < 0.001). Specimens with 100 µm showed, in general, worse results outcomes than those with 50 µm (p < 0.001). However, within the limitations of this comparative in vitro study, it could be concluded that the tested resins and layer thicknesses directly influenced physical and mechanical properties.
The physical and mechanical properties of three-dimensional printed restorations can be affected by the layer thickness, which can interfere with the choice of the 3D printing resin for a desired clinical outcome.
本体外对比研究旨在评估具有两种不同厚度层的四种 3D 打印树脂的物理和机械性能。
打印了四种打印树脂（VarseoSmile Crown Plus，VSC；NexDent C&B MFH，MFH；Nanolab 3D，NNL；和 Resilab 3D Temp，RSL），层厚分别为 50 µm 和 100 µm，形成 80 个 25×2×2 mm 的测量棒。对标本进行拉曼光谱分析以评估转化率，共聚焦激光扫描显微镜分析表面粗糙度（Sa），三点弯曲试验分析抗弯强度和弹性模量，维氏硬度试验（VHN）分析维氏硬度。使用 Shapiro-Wilk 进行数据正态性检验，使用双向方差分析和 Tukey 检验（α=0.05）进行统计分析。
层厚影响所有测试，但弹性模量除外（p<0.001）。100 µm 层厚的标本总体上表现出比 50 µm 层厚的标本更差的结果（p<0.001）。然而，在本体外对比研究的限制内，可以得出结论，测试的树脂和层厚直接影响物理和机械性能。
3D 打印修复体的物理和机械性能可能会受到层厚的影响，这可能会影响对所需临床效果的 3D 打印树脂的选择。
