Abstract
Purpose: This study aimed to compare the effects of two different color shades (A2, A3) and thicknesses of translucent zirconia materials on translucency and to compare the masking ability of these materials on different colored abutment teeth (dentin, resin, and metal).
Methods: Highly transparent zirconia (ZR Lucent Supra, Shofu) was used to fabricate plate specimens with five different thicknesses (0.5, 1.0, 1.5, 2.0, and 2.5 mm), and monolithic zirconia crowns of the maxillary left central incisor. Three different colored abutment teeth (dentin, resin, and gold-colored) were fabricated. The translucency parameter (TP) and color difference (ΔE00) were calculated from the L*, a*, and b* obtained by measurement. The color difference (ΔE00) between crowns of different abutment tooth colors and reference color specimens was calculated.
Results: The TP values decreased significantly as the thickness of the specimens increased. The ΔE00 was significantly different for gold-colored teeth compared to dentin- and resin-colored teeth (P < 0.05).
Conclusion: The color difference between the reference values was large for highly translucent shade-gradient monolithic zirconia crowns, regardless of the shade, when the abutment-tooth color was gold. The study findings indicate that to achieve a highly esthetic crown, the color of the abutment tooth and the thickness of the crown should be considered.
