Espinar Cristina, Della Bona Alvaro, Tejada-Casado Maria, Pulgar Rosa, Pérez María M
Department of Stomatology, Faculty of Dentistry, Colegio Máximo, Campus de Cartuja s/n. University of Granada, 18071, Granada, Spain.
Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, Passo Fundo, RS, Brazil.
Dent Mater. 2023 Oct;39(10):894-902. doi: 10.1016/j.dental.2023.08.003. Epub 2023 Aug 17.
To evaluate the influence of thickness and printing angle on the optical properties of 3D-printed dental restorative resins.
Four 3D printing resin systems were evaluated: DFT-Detax Freeprint Temp; FP- Formlabs Permanent Crown; FP- Formlabs Temporary CB; and GCT- GC Temporary-. Samples from each material were printed at 0° and 90°, and polished up to 0.5, 1.0, 1.5 and 2.0 mm thickness. Scattering (S), absorption (K) and albedo (a) coefficients, transmittance (T%), light reflectivity (RI) and infinite optical thickness (X) were calculated using Kubelka-Munk's model. Data were statistically analyzed using Kruskal-Wallis¸ Mann-Whitney tests, and VAF coefficient.
The spectral distribution on S, K, T%, RI,X were wavelength dependent. Although the spectral behaviors were similar for all the specimens evaluated, the values of S, K, T% andX presented significant differences between specimen thicknesses for all the materials used and for both printing orientations. Values for S and K increased, and T% and X decreased. Significant differences between 0° and 90° were found for RI values at 0.5 and 1.0 mm thick samples, for S and K at 2.0 mm, for X at 0.5 and 1.0 mm for DFT, and at 0.5 mm for FT.
Optical properties of 3D-printed restorative resins vary between thicknesses, and could be affected by the building orientation. Therefore, these factors should be considered in order to improve the biomimetic potential of 3D-printed dental restorative resins.
Understanding the optical behavior of the 3D-printed restorative resins is essential to optimize their clinical performance.
评估厚度和打印角度对3D打印牙科修复树脂光学性能的影响。
评估了四种3D打印树脂系统：DFT-Detax Freeprint Temp；FP-Formlabs永久冠；FP-Formlabs临时CB；以及GCT-GC临时型。每种材料的样品分别以0°和90°打印，并抛光至0.5、1.0、1.5和2.0毫米的厚度。使用库贝尔卡-蒙克模型计算散射（S）、吸收（K）和反照率（a）系数、透光率（T%）、光反射率（RI）和无限光学厚度（X）。数据采用克鲁斯卡尔-沃利斯检验、曼-惠特尼检验和VAF系数进行统计分析。
S、K、T%、RI、X的光谱分布与波长有关。尽管所有评估样品的光谱行为相似，但对于所有使用的材料和两种打印方向，S、K、T%和X的值在样品厚度之间存在显著差异。S和K的值增加，T%和X的值降低。在0.5和1.0毫米厚的样品中，RI值在0°和90°之间存在显著差异；在2.0毫米处，S和K存在显著差异；对于DFT，在0.5和1.0毫米处，X存在显著差异；对于FT，在0.5毫米处，X存在显著差异。
3D打印修复树脂的光学性能因厚度而异，并可能受到构建方向的影响。因此，为了提高3D打印牙科修复树脂的仿生潜力，应考虑这些因素。
了解3D打印修复树脂的光学行为对于优化其临床性能至关重要。
