Evaluation of the holding strength according to the cements used and the type of surface treatment of a single zirconium crown

Abstract

Introduction: The long-term success of zirconium-based restorations depends on the adhesion between the zirconium and the composite cement. Aim: The aim of the present study is to evaluate the retention strength of zirconium crowns according to the type of surface treatment and the cement used. Material s and Methods: The results of testing the strength of adhesion between 228 samples of zirconium crowns and tooth tissue were assessed. Mechanical tensile tests were performed using a universal testing machine. Tensile strength was assessed using five different cements. According to the surface treatment of the zirconium crown, the samples were divided into three groups: control group—without treatment, sandblasting, and coating with tribochemical silica. The results were statistically processed with SPSS v.20.0 using variance analysis, comparison, and correlation. Results: The analysis showed a statistically significant difference between the force required for the detachment of the zirconium crown of the samples (p <0.001) and the surface treatment (p <0.001), as well as for the interaction of the considered cements and the surface treatment (p <0.001). Conclusion: Al 2 O 3 sandblasting is a good surface treatment to improve the adhesion between composite cement and zirconia. Although some studies have shown that sandblasting with Al 2 O 3 is potentially detrimental to the mechanical properties of the material, this is one of the best surface treatments involving CoJet to improve the adhesion between the composite cement and the zirconium. Composite cement with an MDP primer is the recommended cement for monolithic zirconia crowns.