Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva s/n, 18071 Granada, Spain; Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Brazil.
Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva s/n, 18071 Granada, Spain; Houston Center for Biomaterials and Biomimetics, School of Dentistry, University of Texas, 7500 Cambridge St., Houston, TX 77054, USA.
Dent Mater. 2015 Jan;31(1):60-7. doi: 10.1016/j.dental.2014.11.012. Epub 2014 Dec 10.
To use the Kubelka-Munk theory to evaluate the scattering (S), absorption (K) and transmittance (T) of non-colored and colored dental zirconia systems and human (HD) and bovine (BD) dentins.
Two zirconia systems were used: ZC- ZirCAD (Ivoclar Vivadent) and LV-LAVA (3M ESPE). Specimens from each ceramic system were divided into 3 groups (n=5): ZC1 and LV1 (non-colored); ZC2 and LV2 colored to shade A1, and ZC3 and LV3 colored to shade A3. Five human and bovine anterior teeth were flattened and polished through 1200 grit SiC paper to expose the superficial buccal dentin. All samples were prepared to a final thickness of 0.5 mm. Diffuse reflectance was measured against white and black backgrounds, using a spectroradiometer in a viewing booth with D65 illuminant and d/0° geometry. S and K coefficients and T were calculated using Kubelka-Munk's equations. Data was statistically analyzed using Kruskal-Wallis, Mann-Whitney tests, and VAF coefficient.
Spectral distributions of S, K and T were wavelength dependent. The spectral behavior of S and T was similar to HD (VAF≥96.80), even though they were statistically different (p≤0.05). The spectral behavior of K was also similar to HD, except for LV1 (VAF=38.62), yet all ceramics were statistically different from HD (p≤0.05). HD and BD showed similar values of S and T (p>0.05).
The dental professional should consider the optical behavior differences between the zirconia systems evaluated and the human dentin to achieve optimal esthetics in restorative dentistry.
使用库贝尔卡-芒克理论评估非彩色和彩色牙科氧化锆系统以及人（HD）和牛（BD）牙本质的散射（S）、吸收（K）和透光率（T）。
使用了两种氧化锆系统：ZC-ZirCAD（义获嘉伟瓦登特）和 LV-LAVA（3M ESPE）。从每个陶瓷系统中分别取 5 个样本：ZC1 和 LV1（非彩色）；ZC2 和 LV2 着色至 A1 色调，ZC3 和 LV3 着色至 A3 色调。5 个人和牛的前牙被磨平并通过 1200 目碳化硅砂纸抛光，以暴露表面颊侧牙本质。所有样本均制备至最终厚度为 0.5 毫米。在观察亭中使用分光辐射计，在白色和黑色背景下测量漫反射，使用 D65 照明体和 d/0°几何结构。使用 Kubelka-Munk 方程计算 S 和 K 系数和 T。使用 Kruskal-Wallis、Mann-Whitney 检验和 VAF 系数对数据进行统计分析。
S、K 和 T 的光谱分布随波长而变化。S 和 T 的光谱行为与 HD 相似（VAF≥96.80），尽管它们在统计学上存在差异（p≤0.05）。K 的光谱行为也与 HD 相似，除了 LV1（VAF=38.62），但所有陶瓷在统计学上均与 HD 不同（p≤0.05）。HD 和 BD 的 S 和 T 值相似（p>0.05）。
牙科专业人员应考虑评估的氧化锆系统与人牙本质之间的光学行为差异，以在修复牙科中实现最佳美观效果。
