FLUORESCENCE EFFECT OF CAD/CAM HYBRID CERAMIC AND LITHIUM DISILICATE GLASS CERAMIC

Abstract

Limited data are available regarding the fluorescence properties of CAD/CAM lithium disilicate ceramics and hybrid ceramic, despite their importance in achieving natural esthetic dental restorations. Variations in fluorescence among IPS e.max CAD, Amber Mill, Rosetta SM, VITA Enamic, and Cerasmart may influence esthetic outcomes under different lighting conditions. The purpose of this study was to evaluate the fluoresence effect of material type of CAD/CAM lithium disilicate and hybrid ceramics. A total of 50 CAD/CAM lithium disilicate and hybride ceramic specimens were fabricated from IPS e.max CAD, Amber Mill, Rosetta SM, VITA Enamic, and Cerasmart at 1.0 mm thickness. A resin cement substrate (RelyX U200) was used as contol. All specimens was prepared and at 10 × 10 × 1 mm³ in size. All specimens were polished using sequential 800 and 1400-grit silicon carbide papers, and final thicknesses were verified with a digital caliper. Fluorescence-related color differences (∆E₀₀) were measured using a spectrophotometer and calculated with the CIEDE2000 formula. Data were analyzed using one-way ANOVA and least significant difference post-hoc tests (α = .05). At 1-mm thickness, lithium disilicate ceramics exhibited significantly higher fluorescence differences (ΔE₀₀) than hybrid ceramics (p < 0.05), with no significant differences within each material group.

Keywords: CAD/CAM, Lithium Disilicate, Hybrid Ceramic, Fluorescence, Thickness, CIEDE2000, Spectrophotometer