Effect of Ceramic translucency and luting cement shade on the color masking ability of two recent esthetic veneer materials

Abstract

Increased demand for achieving the best esthetics in dentistry has led to an increase in the use of ceramic, hybrid ceramics and tooth colored composite resin restorations.(99) In particular, the CAD/CAM ceramics have enjoyed growing popularity.(100) The final restoration color may be influenced by the thickness and translucency of the veneer restoration.(56) In addition, the color of supporting structure or luting agent may also influence the final color of veneer restorations.(101)Shade selection of thin restorations like laminate veneers is considered a challenge. With the introduction of new ceramic materials, the no-preparation thin veneer concept has received more attention and the challenge increased.(50) Two of the new ceramic materials indicated for thin laminate veneers were used in this study, Vita Enamic which belongs to a new class of ceramics, known as “hybrid-ceramic” It consists of a hybrid structure with two interpenetrating networks of ceramic and polymer. And Vita Suprinity which is a zirconia (10 % by weight) reinforced lithium silicate, in order to obtain the world‘s first zirconia reinforced lithium silicate ceramic (ZLS). Perception of color involves the participation of three factors that can effectively exist, the light source, the object being viewed and the observer viewing the object. In 1936, Munsell described the three dimensions of color to opaque objects: hue, chroma and value then the International Commission of I'Eclairage (CIE) has developed some methods to express the spectral curves in a numerical form known as CIEL*a*b*. Differences in perceived color (ΔE) can be determined using the CIELAB coordinates. This system is widely used in dental research and is useful for calculating color differences.