Effects of Glazing Procedures on the Color Stability of Conventional and CAD/CAM Hybrid Ceramics: A Comparative Study

Journal Title: Meandros Medical and Dental Journal - Year 2019, Vol 20, Issue 3

Abstract

Objective: Ceramic glazing and polishing are important for patient satisfaction and long-term clinical success. Till date, no study has compared color changes after glazing procedures between conventional and more recently introduced ceramics. In this study, we investigated the effects of glazing procedures on the color stability of conventional and computer-aided design/computer-aided manufacturing (CAD/ CAM) hybrid ceramics using a spectrophotometer. Materials and Methods: Eighty-four disc-shaped specimens were fabricated with seven different dental porcelain materials according to the manufacturers’ instructions (n=12 each): Ivoclar IPS DSign, Vita Omega 900, Ceramco III, Vita Mark II, Vita Enamic, GC Cerasmart, and Vita Suprinity. Both sides of the specimens were polished with wet 600-, 1000-, and 1500-grit aluminium oxide abrasive papers, and color values (L*, a*, b*) were measured using a spectrophotometer before and after glazing. Treatment-induced changes in the specimen color and topography were evaluated and recorded. The color change (ΔE) was calculated from the changes in the mean L*, a*, and b* values. All data were analyzed using Kruskal-Wallis, Mann- Whitney U, and Wilcoxon tests (95% confidence interval). Results: Color changes were below the clinically perceptible level (ΔΕ, <3.7) in all specimens. Color change values after the glazing procedures were 2.27±0.55, 2.99±0.67, 1.01±0.58, 1.62±0.70, 0.74±0.45, 1.35±0.52, and 1.37±0.72 for Ivoclar IPS DSign, Vita Omega 900, Ceramco III, Vita Mark II, GC Cerasmart, Vita Enamic, and Vita Suprinity, respectively; thus, there were significant differences between the conventional and CAD/CAM ceramics (p<0.05). The conventional ceramic Vita Omega 900 presented the least color stability, while the CAD/CAM ceramic GC Cerasmart presented the maximum color stability. Conclusion: Glazing procedures do not cause evident changes in the color of conventional and CAD/CAM hybrid ceramics, although the color stability of the latter is better than that of the former.

Authors and Affiliations

Özgün Yusuf Özyılmaz, Gülsüm Sayın Özel, Bebek Serra Oğuz Ahmet

Keywords

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