Translucency and color differences of polycrystalline ceramic materials before and after layering

Objective: To evaluate the transmittance (%T) and color difference (ΔE*) of six zirconia core materials compared to alumina, over eight colored substrates before after ceramic application. Methods: Experimental groups (n=5) standardized disk-shaped cores white zirconia, medium-colored Ice Translucent, Prettau (white D3 colored) were veneered a uniform thickness convenient by layering. Their %T ΔE* different determined glazing. Data analyzed with Kruskal-Wallis Mann-Whitney tests (α<0.05). Results: values significantly (p<0.001) application for all materials. Regarding %T, was most affected, overpassing alumina. Colored decreased equally. In terms ΔE*, initially performed high above clinically acceptable threshold but under it ceramics White only material perform below clinical perceptibility threshold. Alumina two substrates, application, four. Substrates influenced evident on three them. Conclusions: Core values. showed less than both alumina After substrates. have more influence