Department of Prosthodontics, Faculty of Dentistry, Biruni University, Merkezefendi, 75 Sk No:1-13 M. G, 34015 Zeytinburnu, Istanbul, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Bezmialem Vakif University, Istanbul, Turkey.
J Dent. 2024 Jul;146:105101. doi: 10.1016/j.jdent.2024.105101. Epub 2024 May 25.
To evaluate the effect of polishing and layering thickness on the wear resistance of 3D-printed occlusal splint materials.
Specimens with 3 different layer thicknesses (50, 75, 100 µm) were produced in the form of a disc 3 mm thick using V-Print splint resin on a 3D-printer with digital light processing technology. (n = 16 for each thickness) All specimens were washed and cured according to the manufacturer's instructions. Half of the specimens of each layer thickness were polished with silicon carbide papers. All specimens were subjected to 120.000 cycles of a chewing simulator for 2-body wear tests. Before and after the wear test, the specimens were scanned with a laser scanner, and the images were overlaid using a 3D analysis program and the volume loss was calculated. The wear patterns of the specimens were examined under a scanning electron microscope. Statistical evaluation was performed using a Shapiro-Wilk test, 2-way ANOVA, 1-way ANOVA, and Tukey post hoc test (α = 0.05).
While polishing had a significant effect (p = 0.003) on the wear volume of the occlusal splints, layer thickness (p = 0.105) and their interaction between polishing and layer thickness (p = 0.620) did not significantly affect the wear volume. Regardless of the polishing, the lowest mean wear was observed for D50 (0.064 mm), followed by D75 (0.078 mm), and D100 (0.096 mm). However, a significant difference was observed only between polished D50 and unpolished D100.
The polished 3D-printed occlusal splint resin showed higher wear resistance than the unpolished one, regardless of the layer thickness.
Since different layer thicknesses of 50 µm and greater had no effect on the wear resistance of the material, a layer thickness of 100 µm may be preferred for faster printing. However, polishing occlusal splints may reduce the amount of wear and improve clinical performance.
评估抛光和分层厚度对 3D 打印咬合垫材料耐磨性的影响。
使用数字光处理技术的 3D 打印机，以 3mm 厚的圆盘形式制作具有 3 种不同层厚（50、75、100µm）的 V-Print 垫树脂试件（每种厚度 n = 16）。所有试件均按照制造商的说明进行清洗和固化。各层厚度的一半试件用碳化硅砂纸抛光。所有试件均在咀嚼模拟器上进行 120000 次双体磨损测试。在磨损测试前后，使用激光扫描仪对试件进行扫描，使用 3D 分析程序对图像进行叠加，并计算体积损失。在扫描电子显微镜下检查试件的磨损模式。使用 Shapiro-Wilk 检验、2 因素方差分析、1 因素方差分析和 Tukey 事后检验（α = 0.05）进行统计评估。
抛光对咬合垫的磨损体积有显著影响（p = 0.003），而层厚（p = 0.105）及其与抛光的相互作用（p = 0.620）对磨损体积没有显著影响。无论是否抛光，D50（0.064mm）的平均磨损最小，其次是 D75（0.078mm）和 D100（0.096mm）。然而，仅在抛光 D50 和未抛光 D100 之间观察到显著差异。
抛光的 3D 打印咬合垫树脂的耐磨性高于未抛光的，与层厚无关。
由于 50µm 及以上的不同层厚对材料的耐磨性没有影响，因此可能更倾向于使用 100µm 的层厚来加快打印速度。然而，抛光咬合垫可能会减少磨损量，提高临床性能。
