Influence of Resin Cements and Ceramic types on the Color Stability and Translucence of Laminate Veneers/ Influência dos Cimentos de Resina e Tipos Cerâmicos na Estabilidade da Cor e Translucidez das Facetas Laminadas

Objective: This study evaluated the color stability and translucence of resin cements in the fixation of ceramic veneers submitted to aging protocols. Material and Methods: Buccal faces of bovine incisors were planed up to dentin. Eighty ceramic veneers (1 mm) were prepared using two pressed ceramics (IPS e-maxPress and IPS e-maxZirpress, IvoclarVivadent). Before the initial color and translucence readouts (Vita EasyShade, VITA), the veneers were fixed with light (Variolink II, Ivoclar/Vivadent) or dual cured (Relyx U200, 3M ESPE) cements. The samples were submitted (n=10) to thermal mechanical cycling (1.200.000 cycles, 1,3Hz, 5°C/37°C/55°C); and no aging protocol (control). New color and translucence readouts were performed. The cement thickness was quantified by a double coordinate stereomicroscope (Nikon Measurescope) as a control of the study. Results: Data (3-way ANOVA, Tukey, p0,05) showed difference (p0.05) in the color change for both ceramics cemented with U200 with no aging protocol. In the other groups, there was no significant difference (p0.05). There was no difference for translucence regardless ceramics, cements, or aging protocol. Thermal mechanical cycling was not significant for optical changes of the ceramics tested. Conclusions: It was concluded that the color stability and translucence of ceramics with thickness of 1mm were not influenced by the cement when submitted to thermal mechanical cycling.