Abstract
Objective: Evaluating the influence of MDP in different primers and resin cements on microtensile bond strength to zirconia ceramic after thermal cycling. Material and Methods: 6 zirconia blocks (23x20x10 mm) were prepared and divided into 3 groups (n=2) according to the following surface treatments: (1) air-particle abrasion with 50 µm Al2O3 particles, (2) air-particle abrasion and zirconia primer application, (3) air-particle abrasion and MDP-containing primer mixture application. Composite resin blocks were bonded to the pretreated zirconia surfaces using 2 different resin cements. Zirconia-composite blocks were cut to microbars with a cross-section of 1.0 ± 0.2 mm. The samples were thermocycled and microtensile bond strength tests were performed. Samples were evaluated under optical microscope. Data were analyzed with 1- and 2-way ANOVA and Tukey multiple comparison tests (α=.05). Results: MDP based resin cements provided similar bond strengths (p>0.05) to air-particle particle abraded and primer pretreated zirconia surfaces. BisGMA based resin cements provided statistically higher bond strengths (p<0.05) to primer pretreated zirconia surfaces than air-particle particle abrasion alone. No statistically significant differences (p>0.05) were detected between the zirconia primers used. Conclusion: MDP containing resin cements or primers increase the bonding strength of zirconia. When using fixed partial dentures with zirconia substructures, clinicians are advised to use either primers or resin cements with MDP, if not both.
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