Bonding of Resin Composite Luting Cements to Zirconium Oxide by Two Air-particle Abrasion Methods

Abstract

The results of this in vitro study suggest that, in combination with air-particle abrasion methods, Panavia F and RelyX Unicem resin composite luting cements with phosphoric-acid methacrylate content provide a strong resin bond to zirconium oxide. Objective: This study evaluated the shear bond strength of two resin composite luting cements to zirconium oxide ceramic substrate using two air-particle abrasion methods. Methods: Two resin composite cements, RelyX Unicem (3M ESPE) and Panavia F (Kuraray), each with an acidic composition, were used in combination with a zirconium oxide (DCS Dental AG) substrate containing Al₂O₃ and SiO₂ (Rocatec system, 3M ESPE) and two air-particle abrasion methods. The shear bond strength of the resin composite cement to the substrate was tested after the samples were either water-stored for one week or thermocycled following 24 hours of water storage. Results: The RelyX Unicem resin composite cement specimens with the Rocatec treatment (20.9±4.6 Mpa and 20.1±4.2 MPa, respectively, n=12) demonstrated the highest shear bond strength. Alternatively, the lowest values were obtained for the Panavia F resin cement samples, with Al₂O₃ air-particle abrasion in both storage conditions, water storage for one week (17.7±8.9MPa) or thermocycling after 24 hours of water storage (16.3±4.9 MPa). Neither storage condition or particle abrasion system significantly affected shear bond strengths (ANOVA, p>0.05). Conclusion: It was concluded that two different surface conditioning methods and storage conditions did not significantly affect the bonding properties of Panavia F and RelyX Unicem resin composite luting cements to Zirconia.