Evaluating the Effect of High-Translucent Zirconia Thickness and Substrate Shade on the Final Color of the Restoration

Abstract

Objectives

The purpose of this study was to evaluate the effect of high-translucent zirconia thickness and substrate shade on the final color of the restoration.

Material and Methods

A total of 60 high-translucent monolithic zirconia disks were prepared using a CAD/CAM system. They were placed on composite substrates with A2, A3.5, and C3 colors (n = 10). The color differences (ΔE) of the ceramic disks on the A3.5 and C3 substrate compared to the control group (A2) were calculated and compared with acceptable thresholds (ΔE = 5.5) and perceptible thresholds (ΔE = 2/6). A one-sample t-test and repeated measures ANOVA were used to analyze the data statistically.

Results

The highest ΔE values were observed when comparing two zirconia disk thicknesses on the A3.2 substrate without cement (ΔE = 5/65). The lowest value of ΔE compared to the control group (A2) was related to the disk with 1 mm thickness on the A3.5 substrate (ΔE = 2/54), and the highest value was for the disk with 0.6 mm thickness on the C3 substrate (ΔE = 4/88).

Conclusions

Using the zirconia disk with a 1 mm thickness on the C3 structure and a disk with a 0.6 mm thickness on the A3.5 structure with the presence of F2 cement can achieve an acceptable color difference (value of 5.5).