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• W3039732556 abstract "Abstract Objective To meet esthetic requirements, monolithic zirconia can be stained by color‐infiltration. However, adjustments of occlusal surfaces are often necessary, leading to demasking effects if too much of the color‐infiltrated layer is removed. The effect of subsequent material removal on color stability of individually stained zirconia is analyzed here. Materials and methods Thirty‐six white zirconia disks were divided into three groups. Standardized staining strategies for tooth colors VITA A2, A3.5, and A4 were developed and applied to the disks. Samples were grinded in nine successive steps from 20 to 500 μm. A spectroradiometer was used to measure the color differences after each step. Regression analyses were performed for color differences from baseline as a function of depth of material removal. Depth of material removal resulting in color changes surpassing the acceptability threshold of Δ E 00 = 1.8 was estimated using inverse prediction. Results Up to 500 μm material removal, color difference Δ E 00 changes linearly with the depth of material removal ( P < 0.05). Regression analyses showed coefficients of determination ( R 2 ) of 0.97 (VITA A2), 0.87 (VITA A3.5), and 0.96 (VITA A4). Acceptability threshold was surpassed at 62, 87, and 92 μm, respectively. Conclusions Discolorations occur within clinically relevant occlusal adjustments of <100 μm. The effect is more severe with lighter, less saturated tooth colors. Clinical significance Staining that is resistant to occlusal adjustments and abrasion is only possible if the staining solution infiltrates sufficiently deep into the ceramic structure. This study provides for the first time in the literature numerical values that describe the thresholds of acceptability of color differences in zirconia ceramics. These values are essential because they determine the extent of possible occlusal adjustments, and thus the color stability. Further research is necessary to improve the infiltration depth of staining solutions." @default.
• W3039732556 created "2020-07-10" @default.
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• W3039732556 date "2020-07-01" @default.
• W3039732556 modified "2023-09-23" @default.
• W3039732556 title "Color stability of individually stained monolithic zirconia following occlusal adjustment" @default.
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• W3039732556 doi "https://doi.org/10.1111/jerd.12620" @default.
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