Effect of ceramic veneer thickness and cement shade on the CIELAB system after bonding—an in vitro study

Abstract

: In restoration dentistry clinicians need to control the effect of the ceramic thickness and cement shade to achieve successful colorimetric results when allceramic veneers are bonded. The purpose of this study was to evaluate the in vitro effects of cement color and the thickness of the final shade on porcelain discs. The study sample comprised 120 e.max Press HT A-2 ceramic discs of two thicknesses (60 of 1 mm thick and 60 of 0.5 mm thick). Three different lightnesses of Variolink Veneer cement were used (23, 0, and 13) for the cementation process. An Easyshade spectrophotometer was used to measure color coordinates (L*, C*, h, a*, and b*) on the discs both before and after cementation. To a large extent, color changes (DE Ã ab ) after the cementation process were found to depend on cement thickness, ceramic thickness, and cement lightness. This model predicted 52% of the observed variability. The most marked change in color appeared on discs 0.5 mm thick and a cement lightness of 23 (DE Ã ab 5 12.0 units). By contrast, color was more stable (minor changes) on discs with a cement lightness of 13 (DE Ã ab 5 2.3 units). All color coordinates were significantly modified after bonding, both on thin and thick discs and in all three cement color groups (23, 0, and 13). However the difference in color (DE

The effect of resin cement shade and restorative material type and thickness on the final color of resin-matrix ceramics

“…The thickness of translucent metal-free restorations is an essential factor in achieving accurate color matching [48]. Various studies have reported that the color differences decrease when the thickness of the restoration is increased [11,17,49]. Similarly, in the present study, ∆E 00 values decreased when the thickness of the restoration was increased, except for the A1 cement groups.…”

The Effect of Different Surface Treatments on the Color Stabilities of Lithium Disilicate Material

“…In addition, the intrinsic discoloration may be affected by the thickness of the ceramic and the color of the cementation area in the background ( 30 ). Ceramics with a greater thickness exhibit higher color stability ( 8,31 ). The color stability of dental materials should measure on a white background according to ISO standardization ( 32 ).…”

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“…It was shown that white opaque cements provide masking ability when the silver-palladium alloy is used and it results in desirable shade of final restorations of machinable lithium disilicate. In an in vitro study by Montero et al [8] color stability of e.max ceramic was evaluated after bonding with various shades of cements. They showed that cement color is the main factor predicting the final color.…”