Bond strengths of two ceramic laminate systems to bleached enamel

The aim of this study was to evaluate the microtensile bond strengths of ceramic laminate veneers bonded to bleached and non-bleached enamel. Ninety-six extracted maxillary central incisors were divided into two groups of 48 specimens each, bleached group and non-bleached group. After bleaching, teeth were prepared to accommodate veneers of equal thickness. Two ceramic systems, Cerec 3 and IPS Empress 2, were used for restoration. Each of the two ceramic groups was luted with Variolink 2 and RelyX veneer cement. Specimens were then subjected to tensile forces. The bond strength values were analysed with two-way analysis of variance and Tukey honestly significant difference tests. Microtensile bond strength significantly reduced after bleaching procedure (p < 0.05). Variolink 2 resin cement showed higher bonding strength than RelyX veneer cement (p < 0.05). The results of this in vitro study suggest that the bleaching procedure is an important factor on the bonding effectiveness of ceramic laminate veneers.