The influence of foundation restoration type and ceramic thickness on the final color of zirconia‑reinforced lithium silicate ceramic

Abstract

Background: Similarity in the appearance of a monolithic restoration with the adjacent teeth is
necessary. This study aims to influence the foundation material type and ceramic thickness on the
final color of zirconia‑reinforced lithium silicate (ZLS) ceramic.
Materials and Methods: In this experimental study, the A2 translucent blocks of ZLS were
sectioned into rectangular specimens with thicknesses 1, 1.5, and 2 mm (n = 15). Substructure
materials include resin composite (B1, D2, A2, A3, and C3), nickel chrome alloy, amalgam, and white
and black substrate. Substructure material of resin composite with A2 color was proposed as the
control group. The value of the color difference (ΔE00) is calculated by the CIEDE2000 formula. Data
analysis was accomplished by two‑factor repeated measures ANOVA and one‑sample t‑test (α =0.05).
Results: The mean value of maximum ΔE00 with a black substrate (12.13 ± 0.17) at 1 mm
ceramic thickness and the mean value of minimum ΔE00 with B1 resin composite foundation
material (0.02 ± 0.17) at 2 mm ceramic thickness are visible. The significant effect of the foundation
restoration type, thickness, and interaction between them is visible on ΔE00 (P < 0.001).
Conclusion: Different thickness is required to meet ideal esthetic outcomes with different
substrates. Under the conditions of this investigation, zirconia‑reinforced lithium silicate over black,
white, nickel–chromium, and amalgam did not meet acceptable outcomes.
Key Words: Ceramics, color, permanent dental restoration

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Saeed Nikanjam: Pubmed,Google Scholar