Reymus Marcel, Lümkemann Nina, Stawarczyk Bogna
Int J Comput Dent. 2019;22(3):231-237.
The purpose of this investigation was to evaluate the impact of print layer thickness and post-curing method on the degree of conversion (DC) of a three-dimensional (3D) print material for temporary restorations.
120 specimens of the resin material NextDent C&B were additively manufactured in three different print layer thicknesses (25 µm, 50 µm, and 100 µm) using a DLP printer, and post-cured by either Labolight DUO (LL), Otoflash G171 (OF), LC-3DPrint Box (PB) or PCU LED (PCU). Each subgroup contained 10 specimens. Raman spectra were measured for the liquid state of the resin (n = 10), directly after printing (Rprint) and after post-curing (Rcured). DC and ΔDC were calculated. The data were statistically analyzed using the Kolmogorov-Smirnov test, the general linear model analysis together with partial eta-squared (ηP²), Kruskal-Wallis, and Mann-Whitney U tests (P < 0.05).
Specimens post-cured by OF showed the highest ΔDC, followed by specimens post-cured by PB, PCU, and LL (P < 0.001). Post-curing by PB, PCU, and LL resulted in the same ΔDC value range (P = 0.076 to 0.209). The print layer thicknesses of 100 µm and 50 µm (P = 0.931) showed higher ΔDC than the print layer thickness of 25 µm (P < 0.001).
The choice of the post-curing method has a high impact on the DC of the tested 3D print material followed by the specific print layer thickness. Overall, specimens post-cured by OF showed the highest DC and ΔDC values. Brands Technology Duration Wavelength Manufacturer LC-3DPrint Box (PB) Ultraviolet light (UV) 30 min Range 315 to 550 nm, peaks at approximately 360 and 435 nm NextDent (Soesterberg, Netherlands) Otoflash G171 (OF) Flashlight, nitrogen atmosphere Two processes of 2000 flashes Range 300 to 700 nm, peaks at approximately 480 and 530 nm NK Optik (Baierbrunn, Germany) Labolight DUO (LL) Light-emitting diode (LED) Two processes of 3 min Range 380 to 510 nm, peaks at approximately 395 and 475 nm GC Europe (Leuven, Belgium) PCU LED (PCU) Light-emitting diode (LED), vacuum 5 min Peaks at approximately 410 nm Dreve (Unna, Germany).
本研究旨在评估打印层厚度和后固化方法对用于临时修复的三维（3D）打印材料的转化率（DC）的影响。
使用DLP打印机以三种不同的打印层厚度（25μm、50μm和100μm）增材制造120个NextDent C&B树脂材料样本，并通过Labolight DUO（LL）、Otoflash G171（OF）、LC-3DPrint Box（PB）或PCU LED（PCU）进行后固化。每个亚组包含10个样本。对树脂的液态（n = 10）、打印后立即（Rprint）和后固化后（Rcured）测量拉曼光谱。计算DC和ΔDC。使用Kolmogorov-Smirnov检验、一般线性模型分析以及偏 eta 平方（ηP²）、Kruskal-Wallis和Mann-Whitney U检验对数据进行统计分析（P < 0.05）。
经OF后固化的样本显示出最高的ΔDC，其次是经PB、PCU和LL后固化的样本（P < 0.001）。经PB、PCU和LL后固化产生的ΔDC值范围相同（P = 0.076至0.209）。100μm和50μm的打印层厚度（P = 0.931）显示出比25μm的打印层厚度更高的ΔDC（P < 0.001）。
后固化方法的选择对测试的3D打印材料的DC有很大影响，其次是特定的打印层厚度。总体而言，经OF后固化的样本显示出最高的DC和ΔDC值。
品牌 技术 持续时间 波长 制造商
LC-3DPrint Box（PB） 紫外线（UV） 30分钟 范围315至550nm，峰值约为360和435nm NextDent（荷兰索斯特贝格）
Otoflash G171（OF） 手电筒，氮气氛围 两个2000次闪光过程 范围300至700nm，峰值约为480和530nm NK Optik（德国拜尔布伦）
Labolight DUO（LL） 发光二极管（LED） 两个3分钟过程 范围380至510nm，峰值约为395和475nm GC Europe（比利时鲁汶）
PCU LED（PCU） 发光二极管（LED），真空 5分钟 峰值约为410nm Dreve（德国乌纳）
