Objectives: The purpose of this laboratory study was to evaluate the influence of different cleaning methods after saliva contamination and after using a silicone disclosing medium on the resin bond strength to zirconia ceramic. Methods: Plexiglas tubes filled with composite resin (Clearfil FII, Kuraray, J) were bonded to sandblasted zirconia ceramic discs (Cercon, Degudent, FRG) using the phosphate monomer containing composite resin Panavia F2.0 (Kuraray, J). Four surface cleaning methods were used after contamination the ceramic bonding surface with saliva and a silicone disclosing medium (Fit-Checker, GC, J): (A) cleaning in 96% isopropanol for 15s, (P1) cleaning with 37% phosphoric acid for 60s one time or (P2) for 30s two times, or (S) sandblasting with 50µm Al₂O₃ at 2.5 bars pressure for 15s. The specimens of the control group (C) were not cleaned after using the silicone disclosing medium. In each group eight specimens were bonded in an alignment apparatus using the Panavia F2.0. Groups were stored for 3 days in tap water at 37 °C. Then the tensile bond strength was tested in a universal testing instrument (Zwick Z010/TN2A, Ulm, FRG) at 2 mm/min using an alignment which provided a moment-free axial force application. Results: The mean tensile bond strengths (TBS) in MPa were: (A) 8.2 ± 5.5; (P1) 23.6 ± 6.4; (P2) 37.2 ± 4.8; (S) 49.9 ± 7.4; (C) 6.6 ± 5.7. There were statistically significant differences among groups as revealed by the Kruskal-Wallis test (p < 0.001). Sandblasting of the ceramic surface provided statistically significantly higher TBS than the other cleaning methods. Cleaning in isopropanol did not improve TBS when compared to not cleaning at all. Conclusion: Ceramic cleaning methods after try-in procedures have a significant influence on the resin bond strength. Sandblasting of zirconia ceramic is most effective.

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