Effect of different surface treatments on shear bond strength of zirconia bonded to dentin with two resin luting cements

Abstract

All-ceramic materials, especially silica-based lithium di-silicate and non-silicatebasedZirconia have become a topic of interest in the field of dentistry. It is stilldifficult to achieve a strong and durable resin-ceramic adhesion, especially resin-Zirconia bonding, focusing on the latest resin bonding techniques including surfacetreatment, priming and cementation.The purposes of this study was to evaluate the effect of different surfacetreatments on shear bond strength of zirconia bonded to dentin with two resin lutingcements.A total 60 zirconia discs 3mm thickness and 6 mm diameter subjected tothree types of surface treatments,irradiated with CO2 laser,etched with hydrofluoricacid, sandblasted+ceramic primer application,then bonded to dentin with two types ofresin cement (variolinkII and Dentocem). Shear bond strength was measured and thetype of failures were determined. The data were statistically analyzed by one-wayanalysis of variance and Independent T-test. The results of this study showed that thegroups which were sandblasted treated with ceramic primer produced highest shearbond strength followed by hydrofluoric etched groups and CO2 laser irradiated groupsshowed the lowest bond strength. Dentocem resin cement showed better bonding thanvariolink II.The failures were either adhesive (between discs and cement)orcohesive(cements on both disc and dentin).As a conclusion the bonding of Zirconiacan be improved by the different surface treatments especially by sandblastingceramic primer . Dentocem resin cement showed higher shear bond strength thanvariolinkII so promoted better adhesion between dentin and zirconia..