An In Vitro Comparative Evaluation of Shear Bond Strength of Zirconia Restorations using Various Cleansing Protocol

The aim of this study to the leverage of Ivoclean on saliva-contaminated zirconia in comparison to air abrasion regarding of resin bonding strength. Materials and Methods: A total of 30 partially-stabilized translucent zirconia disk-specimens with a thickness of 2 mm and a diameter of 4 mm were turned out, the specimens were classified into three experimental groups according to the surfaces cleaning methods: "CO" 1st group no contaminated ( control group), "AB" 2nd group immersion in saliva then rinsed with water spray for 15s, air drying for 15s with compressed air free oil afterwards alumina blasting with 50 mm particles of Al2O3 at 0.3 MPa for 15 seconds at a distance of 10 mm, using a blasting machine, "IC" 3th group : immersion in saliva for 1 min then water rinsing and air drying protocol, Ivoclean was applied for 20 s without rubbing motion, then water rinsing and air drying protocol was applied. The pretreated specimens were bonded using one self-adhesive resin cement(Multilink N) , and shear bond strength (SBS) were examined using a universal testing machine at a crosshead speed of 0.5 kg/min. Results: The data so obtained was tabulated and statistically analyzed . The results showed after analyzing no significantly difference between (IC) and (AB) ( P>0.05), and no significantly difference between (IC) and (CO) in improving of (SBS) (P<0.05). Conclusion: Within the limitations of this in-vitro study, it can be concluded that Ivoclean is effective for removing saliva contaminants, and can improve the resin bond strength to saliva-contaminated zirconia surfaces.