Mascaro Bruno Arruda, Tejada-Casado Maria, Fonseca Renata Garcia, Cardona Juan C, Dos Santos Nunes Reis José Maurício, Pérez María M
Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, São Paulo, Brazil.
Department of Optics, Faculty of Science, Instituto de Investigación Biosanitaria ibs.GRANADA, University of Granada, Granada, Spain.
J Esthet Restor Dent. 2025 Sep;37(9):2134-2143. doi: 10.1111/jerd.13490. Epub 2025 May 27.
To evaluate the masking ability of different thicknesses of CAD-CAM resin-matrix and feldspar porcelain materials.
Specimens (Ø7.5 mm, thickness 0.5, 1.0, and 1.5 mm, n = 3/material) were fabricated from Lava Ultimate-LU, Grandio Blocs-GB, VITA Enamic-VE, and VITA Mark II-VM. Backgrounds were obtained from nine composite die shades (ND1-ND9, IPS Natural Die Material). Spectral reflectance was measured for samples against a black background and each ND background. CIEDE2000 color differences (ΔE), relative translucency parameter differences (ΔRTP), and infinite optical thickness (X) were calculated. ΔE data among materials were analyzed using Kruskal-Wallis and Mann-Whitney tests (α = 0.05). ΔE between thicknesses and ΔRTP data were compared to perceptible and acceptable thresholds. Root mean square error (RMSE) and goodness-of-fit (GFC) were used as performance behavior of X.
VM exhibited the lowest ΔE (p < 0.001) and ΔRTP values across all tested conditions. Overall, LU and GB did not differ for 0.5 and 1.0 mm. Regardless of the background, when comparing 1.0-1.5 mm, acceptable ΔE were observed, with only VM showing imperceptible values. Good spectral match and good comparative values of X were found for LU-GB.
The masking effect depended on material and thickness, with VM and thicker samples demonstrating superior results. In general, the spectral behavior and values of infinite optical thickness differed among materials.
The masking ability of high-translucency CAD-CAM materials was influenced by composition, thickness, and the underlying tooth-colored background. Materials with lower translucency and greater thickness are recommended for highly discolored teeth. Vita Mark II was the most suitable material for restorations on darkened substrates.
评估不同厚度的计算机辅助设计与制造（CAD-CAM）树脂基质材料和长石瓷材料的遮色能力。
用Lava Ultimate-LU、Grandio Blocs-GB、VITA Enamic-VE和VITA Mark II-VM制作样本（直径7.5毫米，厚度0.5、1.0和1.5毫米，每种材料n = 3）。背景取自九种复合印模色（ND1-ND9，IPS天然印模材料）。测量样本在黑色背景和每种ND背景下的光谱反射率。计算CIEDE2000色差（ΔE）、相对半透明参数差（ΔRTP）和无限光学厚度（X）。使用Kruskal-Wallis检验和Mann-Whitney检验分析材料间的ΔE数据（α = 0.05）。将厚度间的ΔE和ΔRTP数据与可察觉阈值和可接受阈值进行比较。均方根误差（RMSE）和拟合优度（GFC）用作X的性能指标。
在所有测试条件下，VITA Mark II-VM表现出最低的ΔE（p < 0.001）和ΔRTP值。总体而言，对于0.5毫米和1.0毫米的样本，Lava Ultimate-LU和Grandio Blocs-GB没有差异。无论背景如何，在比较1.0 - 1.5毫米样本时，观察到可接受的ΔE，只有VITA Mark II-VM显示出不可察觉的值。发现Lava Ultimate-LU和Grandio Blocs-GB具有良好的光谱匹配和X的良好比较值。
遮色效果取决于材料和厚度，VITA Mark II-VM以及较厚的样本表现出更好的效果。一般来说，材料间的光谱行为和无限光学厚度值有所不同。
高透明度CAD-CAM材料的遮色能力受成分、厚度和底层牙齿颜色背景的影响。对于高度变色的牙齿，建议使用半透明度较低且厚度较大的材料。Vita Mark II是用于深色基底修复的最合适材料。
