Shear Strength between a Resin Cement and a Cobalt-Chromium Alloy and Yttria-Stabilized Zirconia

Sammanfattning: New trademarks appear on the dental market every year and it is difficult to determine whether they should be used in clinical praxis or not. Numerous studies have been carried out to investigate different types of materials, trying to declare which material is best suited for a certain type of restorations. The study objective was to investigate if there are any differences in the shear bond strength between a self-adhesive cement and an yttrium oxide-stabilized zirconium dioxide (Y-TZP) and a dental cobalt-chromium alloy (Co-Cr).  The null hypothesis was used. The hypothesis was that the shear bond strengths was the same when cementing the adhesive cement to the dental Co-Cr alloy and the yttrium oxide-stabilized zirconium dioxide. Twenty plastic embedded samples were used in this study, 10 specimens of Co-Cr alloy, and 10 specimens of Y-TZP. The cement was applied, and the specimen were stored in water of 37°C for 24 hr. The tests were performed with an UltraTester™ with the speed of 1 mm / min to measure the shear bond strength (SBS) between the adhesive cement, the Y-TZP and the Co-Cr alloy. The values where then registered. The mean value of the shear bond strength for adhesive cement and Y-TZP was 23.5 MPa, and for Co-Cr alloy 22.8 MPa. No significant difference in shear bond strength were found between the adhesive cement and the Y-TZP and the Co-Cr alloy, after being stored in water for 24 hrs, p > 0.05.