Resin composite layering on discolored substrates ensures masking ability for monolithic ceramics

• Published in: Journal of esthetic and restorative dentistry 2023-09, Vol.35 (6), p.860-868
• Main Authors: Soares, Pablo Machado, Pereira, Gabriel Kalil Rocha, Bacchi, Atais
• Format: Article
• Language: English
• Subjects: CAM; ceramic thickness; Ceramics; color difference; color matching; Composite materials; Computer aided manufacturing; Lithium; Metals; resin composite; Shade; Zirconia
• ISSN: 1496-4155; 1708-8240
• DOI: 10.1111/jerd.13066

Objective the aim of this study was to evaluate the effect of resin composite layering on discolored substrates to obtain masking ability with monolithic ceramics. Materials and Methods Four groups (n = 8) of computer‐aided design/computer aided manufacturing (CAD/CAM) monolithic ceramics, shade A1, with thicknesses of 1.0 and 1.5 mm, were tested: feldspathic (FC), leucite‐reinforced (LC), lithium disilicate‐reinforced (LD), and translucent zirconia (5YSZ). Five substrates were used: A1 (used as reference), A3.5, C4, and coppery and silvery metals. The substrates were separated as non‐layered or layered (with flowable opaque resin composite (FL), white opaque restorative resin composite (WD), and A1‐shaded opaque restorative resin composite (A1D)). Resin composite layers of 0.5 and 1.0 mm were tested. The try‐in paste, shade A1, was used as a luting agent. Translucency parameter (TP00) was assessed for the ceramics. Color differences (∆E00) were assessed for the restorative ceramics and resin composite layers over discolored substrates with the CIEDE2000 formula. The results were compared statistically, and descriptively with acceptability (AT, 1.77) and perceptibility (PT, 0.81) thresholds. Results Feldspathic showed the highest TP00 (for both ceramic thicknesses) and LD the lowest (for 1.5 mm of ceramic thickness) (P