The Effect of Luting Agents and Ceramic Thickness on the Color Variation of Different Ceramics against a Chromatic Background

Abstract

Objectives: The aim of this study was to assess the influence of various ceramic thicknesses and luting agents on color variation in five ceramic systems. Methods: Fifteen disc-shaped ceramic specimens (11 mm diameter; shade A3) were fabricated with each of the six veneering ceramics tested, with 1, 1.5, or 2 mm thickness (n=5). Resin composite discs (Z-250, shade C4) were used as bases to simulate a chromatic background. The cementation of the veneers was carried out with an opaque resin-based cement (Enforce, shade C4), a resin-based cement (Enforce, shade A3), or without cement (C4, control group). Color differences (ΔE*) were determined using a colorimeter. Three-way ANOVA was used to analyze the data, followed by a Tukey post-hoc test (α=.05). Results: The L*a*b* values of the ceramic systems were affected by both the luting agent and the ceramic thickness (P<.05). In general, there was no difference between the control group and the group using the resin-based cement. The use of an opaque luting agent resulted in an increase of the color coordinates a*, b*, L*, producing differences in ΔE* values for all ceramics tested, regardless of the thickness (P<.05). For the 2-mm thick veneers, higher values in the color parameters were obtained for all ceramics and were independent of the luting agent used. Conclusions: The association of 2-mm thickness with opaque cement presented the strongest masking ability of a dark colored background when compared to a non-opaque Lutinging agent and the other thicknesses tested. (Eur J Dent 2011;5:245-252)

Color Variation Between Matched and Fabricated Shades of Different Ceramics

“…There was a significant difference of ΔE between natural teeth and crowns fabricated with different thicknesses of all the ceramic systems investigated. Our result was in accordance with those of other studies . In this respect, Christensen et al and Chu et al commented that although deeper preparation for ceramic veneers presents some disadvantages related to the adhesion of the veneer to the underlying dental structure and more sound tissue removal jeopardizing pulpal health, it also promotes enhanced masking of the darkened tooth.…”

Effectiveness of Combination of Dentin and Enamel Layers on the Masking Ability of Porcelain

“…Proper measurement of the in vitro optical qualities of multilayer configurations that simulate clinical restorative conditions is quite challenging. Therefore, several variables that could interfere with the final color and translucency of the porcelain laminate veneers were controlled in this study, such as ambient light conditions (22), ceramic shade (13), ceramic composition (20,22,29), ceramic glazing (8,16), and ceramic firing conditions (16).…”

“…The masking ability of porcelain laminate veneers over discolored abutment teeth might be improved by using thicker porcelain layers and/or increasing the removal of dental structure (15)(16)(17)(18). This assumption is based on clinical practice only, as there is no consensus in the literature regarding the ideal porcelain thickness for the various porcelain systems commercially available or the optimal amount of tooth structure removal to place porcelain laminate veneers with the best masking ability (15,(19)(20)(21)(22)(23).…”

Comparação estética entre sistemas cerâmicos sobre substrato escurecido

“…Estes resultados estão de acordo com a literatura passada, classificando as cerâmicas em dissilicato de lítio como cerâmicas translúcidas (10,(12)(13)(14)(15). Sendo assim, caso não haja uma espessura suficiente de cerâmica, a cor de um substrato escurecido irá influenciar negativamente o resultado estético do tratamento protético realizado com coroas em dissilicato de lítio (2,3,6,(16)(17)(18)(19).…”