Evaluation Of The Effect Of Different Surface Treatments, Aging And Enzymatic Degradation On Zirconia-Resin Micro-Shear Bond Strength

Jihad Saade,1 Hasan Skienhe,1 Hani F Ounsi,2 Jukka P Matinlinna,3 Ziad Salameh4 1Department of Prosthodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon; 2Department of Restorative Dentistry and Endodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon; 3Department of Restorative Dentistry and Endodontics, Faculty of Dental Medicine, Siena University, Siena, Italy; 4Department of Dental Materials Science, Faculty of Dentistry, University of Hong Kong, Pokfulam, Hong KongCorrespondence: Jihad SaadeFaculty of Dental Medicine, Lebanese University, Beirut, LebanonTel +961 3 763 404Email jihadsaade00@gmail.comPurpose: The purpose of this study was to evaluate the effect of surface treatments on zirconia-resin bonding and the effect of aging on bond durability for one year.Method: Three hundred and twenty zirconia blocks were divided into 4 equal study groups. Group 1 (control): as-sintered, group 2: (GB): grit-blasted, group 3: (LAS): laser-etched, group 4: (SIE): selective infiltration etching. Composite cylinders were bonded to the zirconia with resin cement and ceramic primer. Aging was performed following 3 different aging protocols: thermocycling, storage in distilled water, or storage in an enzymatic esterase solution. Micro-shear bond strength test (μSBS) was recorded using a universal testing machine. μSBS values were analyzed using two-way Analysis of Variance followed by Tukey post-hoc tests. Level of significance was set at 0.05.Results: GB, LAS and SIE groups showed significantly higher values when compared to control. Groups GB, LAS and SIE reported a significant decrease up to 50% in μSBS after water storage and enzymatic degradation, while control group reported a 90% decrease. Failure analysis showed mainly adhesive failure for control group, while the percentage of cohesive failure in resin cement was higher in SIE group compared to GB and LAS groups.Conclusion: Water aging and esterase solutions played a significant role by increasing bond degradation. A minimum of one-year water and esterase storage medium should be used to evaluate the durability of the bond between resin cement and zirconia.Keywords: air abrasion, laser, MDP primer, resin cement, aging