老化对3D打印树脂基牙科修复材料光学性能和颜色的影响。
Effect of aging on optical behavior and color of 3D printing resin-based dental restorative materials.
作者信息
Pérez María M, Espinar Cristina, Pecho Oscar E, Tejada-Casado Maria, Della Bona Alvaro
机构信息
Department of Optics, Faculty of Science, Campus Fuente Nueva, Edificio Mecenas, s/n. University of Granada, 18071, Granada, Spain.
Department of Stomatology, School of Dentistry, Colegio Máximo, Campus de Cartuja, s/n. University of Granada, 18071, Granada, Spain.
出版信息
J Dent. 2025 Jun;157:105734. doi: 10.1016/j.jdent.2025.105734. Epub 2025 Apr 9.
OBJECTIVES
To evaluate the influence of aging on color and optical properties of 3D printing resin-based dental restorative materials.
METHODS
Four 3D printing resin-based dental restorative materials (DFT- Detax Freeprint Temp; FT- Formlabs Temporary CB; FP- Formlabs Permanent Crown; and GCT- GC TempPrint) were evaluated. The structures were printed using digital light processing (DLP) (DFT and GCT groups) and stereolithography (SLA) (FT and FP groups) technologies. Samples (10 × 10 × 1 mm; n = 3) were printed in light (L) and medium (M) shades and at 0° and 90° and then polished to a thickness of 1.00 ± 0.01 mm with silicon carbide (SiC) sandpapers under water cooling. Artificial aging followed the ISO 4892-2 standard. 1) Color differences were evaluated using CIEDE2000 and perceptibility and acceptability thresholds (PT and AT), 2) spectral reflectance (R%) and transmittance (T%) were measured and scattering (S) and absorption (K) coefficients, light reflectivity (RI), infinite optical thickness (X∞) pre- and post-aging were calculated using Kubelka-Munk method and Root Mean Square Error (RMSE) and Goodness of Fit (GFC) were used as performance optical behavior.
RESULTS
- All 3D-printed dental resins evaluated, irrespectively of the printed angles, showed mean ΔE values above AT (ΔE>1.8), and FT-M and FP-M showed the least color changes among the evaluated materials, 2) GFC<0.999 and RMSE >2 % values were found between pre and post aging for R%, T%, S, K, RI and X∞ properties.
CONCLUSIONS
This study showed poor spectral match and comparative spectral values of R%, T%, S, K, RI and X∞ between after and before aging, resulting in unacceptable color changes. Printing orientation does not influence the change of the optical behavior of the evaluated materials after aging.
CLINICAL SIGNIFICANCE
Aging causes significant changes on the spectral optical behavior for the 3D-printed resin-based restorative materials studied, resulting in clinically unacceptable color changes.
目的
评估老化对3D打印树脂基牙科修复材料颜色和光学性能的影响。
方法
对四种3D打印树脂基牙科修复材料（DFT - Detax Freeprint Temp；FT - Formlabs Temporary CB；FP - Formlabs Permanent Crown；以及GCT - GC TempPrint）进行评估。使用数字光处理（DLP）技术（DFT和GCT组）以及立体光刻（SLA）技术（FT和FP组）打印结构。将样品（10×10×1毫米；n = 3）打印成浅色（L）和中色（M），并在0°和90°角度下打印，然后在水冷条件下用碳化硅（SiC）砂纸打磨至厚度为1.00±0.01毫米。人工老化遵循ISO 4892 - 2标准。1）使用CIEDE2000以及感知阈值和可接受阈值（PT和AT）评估颜色差异，2）测量光谱反射率（R%）和透射率（T%），并使用Kubelka - Munk方法计算老化前后的散射（S）和吸收（K）系数、光反射率（RI）、无限光学厚度（X∞），并将均方根误差（RMSE）和拟合优度（GFC）用作光学性能指标。
结果
1）所有评估的3D打印牙科树脂，无论打印角度如何，平均ΔE值均高于AT（ΔE>1.8），并且FT - M和FP - M在评估材料中颜色变化最小，2）对于R%、T%、S、K、RI和X∞性能，老化前后的GFC<0.999且RMSE>2%。
结论
本研究表明老化前后光谱匹配性差，R%、T%、S、K、RI和X∞的光谱值存在差异，导致颜色变化不可接受。打印方向不影响老化后评估材料光学性能的变化。
临床意义
老化会使所研究的3D打印树脂基修复材料的光谱光学性能发生显著变化，导致临床上不可接受的颜色变化。
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