打印角度对牙科修复体 3D 打印树脂颜色和半透明度的影响。
The influence of printing angle on color and translucency of 3D printed resins for dental restorations.
机构信息
Department of Stomatology, Faculty of Dentistry, Colegio Máximo, University of Granada, Campus de Cartuja s/n, 18071 Granada, Spain.
Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, Passo Fundo, RS, Brazil.
出版信息
Dent Mater. 2023 Apr;39(4):410-417. doi: 10.1016/j.dental.2023.03.011. Epub 2023 Mar 11.
OBJECTIVES
To evaluate the influence of printing orientation on color and translucency of 3D printing restorative resins.
METHODS
Four 3D printing resin systems in the available shades (DFT-Detax Freeprint Temp- A1, A2,A3; FP-Formlabs Permanent Crown- A2,A3,B1,C2; FT- Formlabs Temporary CB- A2,A3,B1,C2; GCT-GC Temporary- Light, Medium) were evaluated. Three samples (10×10×1.2 mm) from each material were printed at two different printing orientations (0° and 90°) and polished to 1.00 ± 0,01 mm of thickness. Spectral reflectance was measured against black background using a calibrated spectroradiometer, CIE D65 standard illuminant and the 45°/0°geometry. Color and translucency differences were evaluated using CIEDE2000 metric (ΔE) and 50:50% perceptibility (PT and TPT) and acceptability (AT and TAT) thresholds.
RESULTS
In general, color changes due to printing orientation at (0° and 90°) were mainly produced by ΔL* or ΔC* . ΔE were above PT for all DFT shades, FP-B1, FP-C2, FT-A2 and FT-B1. Only for DFT-1, ΔE was above AT. ΔRTP values were above TPT for DFT-A1, DFT-A3, FP-B1 and FT-B1, but lower than TAT. The direction of the changes in translucency (ΔRTP) depends on the material and shade.
SIGNIFICANCE
The selection of building orientation (0° and 90°) for the 3D printed resins influence the visual color and translucency and therefore their esthetic appearance. These aspects should be considered when printing dental restorations using the evaluated materials.
目的
评估 3D 打印修复树脂的打印方向对颜色和半透明度的影响。
方法
评估了四种可用色调的 3D 打印树脂系统（DFT-Detax Freeprint Temp-A1、A2、A3；FP-Formlabs Permanent Crown-A2、A3、B1、C2；FT-Formlabs Temporary CB-A2、A3、B1、C2；GCT-GC Temporary-Light、Medium）。从每种材料中打印三个样品（10×10×1.2mm），分别在两种不同的打印方向（0°和 90°）下进行，并抛光至 1.00±0.01mm 的厚度。使用经过校准的分光辐射计、CIE D65 标准照明体和 45°/0°几何结构，对黑色背景下的光谱反射率进行测量。使用 CIEDE2000 度量（ΔE）和 50:50%可察觉性（PT 和 TPT）和可接受性（AT 和 TAT）阈值评估颜色和半透明度差异。
结果
一般来说，（0°和 90°）打印方向引起的颜色变化主要由ΔL或ΔC引起。对于所有 DFT 色调、FP-B1、FP-C2、FT-A2 和 FT-B1，ΔE 均高于 PT。只有 DFT-1 的 ΔE 高于 AT。对于 DFT-A1、DFT-A3、FP-B1 和 FT-B1，ΔRTP 值高于 TPT，但低于 TAT。半透明度变化的方向（ΔRTP）取决于材料和色调。
意义
3D 打印树脂的构建方向（0°和 90°）的选择会影响其视觉颜色和半透明度，从而影响其美观外观。在使用评估材料打印牙科修复体时，应考虑这些方面。
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