Li Ping, Fernandez Pablo Kraemer, Spintzyk Sebastian, Schmidt Franziska, Yassine Jamila, Beuer Florian, Unkovskiy Alexey
Center of Oral Implantology, Stomatological Hospital, School of Stomatology, Southern Medical University, Guangzhou, China.
Section Medical Materials Science and Technology, Tübingen University Hospital, Tübingen, Germany.
J Prosthodont Res. 2023 Oct 13;67(4):562-567. doi: 10.2186/jpr.JPR_D_22_00126. Epub 2023 Feb 18.
To investigate the effects of printing-layer thickness and build angle on the surface characteristics and microbial adhesion of denture base polymers manufactured by digital light processing (DLP).
Specimens were additively manufactured using DLP. The specimens were printed with different printing-layer thicknesses (25, 50, and 100 μm) and build angles (0°, 45°, and 90°). Scanning electron microscopy was used to observe the surface topography, and the arithmetical mean heights (S) were measured. Moreover, the initial Candida albicans (C. albicans) adhesion to the specimens was evaluated using an adhesion test. Finally, two-way ANOVA and Tukey's multiple comparison tests were conducted.
The results regarding the S values exhibited a statistically significant interaction (F (4, 45) = 90.77, P < 0.0001). The build angle has a significant impact on the surface topography. Furthermore, quantitative results revealed that the printing-layer thickness significantly affected C. albicans adhesion (F (2, 99) = 6.96, P = 0.0015).
The surface roughness was significantly affected by the printing-layer thickness and the build angle. Additionally, the surface topography was mainly determined by the build angle. Furthermore, the adhesion of C. albicans to the DLP-printed denture surfaces was significantly affected by the printing-layer thickness but not by the build angle. Consequently, it is critical to decrease the thickness of the printing layer to produce digital dentures with optimal material properties.
研究打印层厚度和成型角度对通过数字光处理（DLP）制造的义齿基托聚合物表面特性和微生物黏附的影响。
使用DLP进行增材制造制备样本。样本采用不同的打印层厚度（25、50和100μm）和成型角度（0°、45°和90°）进行打印。使用扫描电子显微镜观察表面形貌，并测量算术平均高度（S）。此外，通过黏附试验评估白色念珠菌对样本的初始黏附情况。最后，进行双向方差分析和Tukey多重比较检验。
关于S值的结果显示出具有统计学意义的交互作用（F(4, 45) = 90.77，P < 0.0001）。成型角度对表面形貌有显著影响。此外，定量结果表明打印层厚度对白色念珠菌黏附具有显著影响（F(2, 99) = 6.96，P = 0.0015）。
打印层厚度和成型角度对表面粗糙度有显著影响。此外，表面形貌主要由成型角度决定。而且，白色念珠菌对DLP打印义齿表面的黏附受打印层厚度显著影响，但不受成型角度影响。因此，降低打印层厚度对于生产具有最佳材料性能的数字义齿至关重要。
