EFFECT OF DIFFERENT SURFACE TREATMENT ON BOND STRENGTH OF RESIN CEMENT TO ZIRCONIUM AND LEUCITE-REINFORCED GLASS CERAMIC

Aim: The aim of this study was to determine shear bond strength of resin cement to zirconium and leucite-reinforced glass ceramic after different surface treatment. Materials and Methods: A total of 50 discs of zirconium and leucite-reinforced glass ceramic were prepared (10 mm in diameter and 1 mm in thickness) according to the manufacturer’s instructions. Specimens were embedded in self-cure acrylic resin blocks. Specimens were divided into five groups randomly (n=5), and the following treatments were applied: 1. Air abrasion with aluminium-oxide particles (50 μm), 2. Acid etching with 9,5% hydrofluoric acid, 3. Co-jet, 4. Nd:YAG laser irradiation (1 mm distance, 100 mJ, 20 Hz, 2 W) and 5. Er:YAG laser irradiation (1 mm distance, 400 mJ, 20 Hz, 8 W). After the surfacetreatment methods, Panavia F dual-cure resin cement were applied on the specimens. All the specimens were subjected to a shear test to evaluate their bond strengths. The data were analyzed with one-way variance analysis (ANOVA). Results: In the leucite-reinforced glass ceramic specimens, the highest bonding values (12.06±1.4) was obtained in HF acid group. In the zirconium specimens, the highest bonding values (9.7±4.05) was obtained in CoJet group. However, adhesive failures were obtained in these groups. But, cohesive failures were obtained commonly in Co-jet groups. Conclusions: The in vitro findings from this study indicate that surface-treatment procedures applied to leucite-reinforced glass ceramic and zirconium are important to bond strength of resin cement.