Translucency of ceramic material in different core-veneer combinations

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Statement of problem.Understanding the translucency of ceramic materials is important to achieve good esthetics. Ceramic thickness is related to translucency; however, less information about core-veneer thickness in combination is available.Purpose.The purpose of this study was to investigate the translucency parameters of core-veneer thicknesses in 2 different ceramic materials.Material and Methods.A total of 56 ceramic disks of different thickness were fabricated as cores according to the manufacturer’s recommendations and divided into groups (n=7). Each was veneered with its compatible veneer ceramic with a different thickness (0.2, 0.5, 0.7 mm). One group of each ceramic type was left without veneer. The groups were named according to core names (group IPS e.max Press [EP], group IPS Empress Esthetic [EE]), and numbers were given according to thickness combination: 1=(1.00+0.5); 2=(0.8+0.7); 3=(1.00); 4=(0.8+0.2). All surfaces were measured by profilometry to ensure consistency within the groups. A glass disk (1.5 mm) positive control (group P) and a metal core (1.5 mm) negative control (group N) were prepared. The translucency parameter values were calculated by using spectrophotometry to calculate the color differences of the specimens over black and white backgrounds.Results.A 1-way ANOVA found significant differences among the translucency parameter values of the ceramic groups (P<.01). A 1-sample t test determined thickness consistency, and 1-way analysis was performed to ensure surface roughness consistency within the groups (P>.05).Conclusions.Total ceramic thickness affected the translucency; higher combined ceramic thickness resulted in lower translucency parameter values. When total thickness decreases, the translucency of core material has more effect than that of veneer material on translucency parameter values.

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