Investigation of the Effect of Thermal Aging on Bond Strength of Different Adhesive Agents to Zirconia-Based All-Ceramics

In recent years, the alteration of techniques and materials used in fixed prosthodontic restorative applications are made it necessary to the development of cements. The long-term success of zirconia-based all-ceramic restorations depends on the preparation technique of the internal surfaces of ceramics prior to cementation, cement properties and bond strength between the cement and the ceramic restoration. The aim of this study was to evaluate the effect of thermal aging process on the shear bond strength between zirconia-based all-ceramic and resin cement. The study was performed using a total of 80 extracted, non-carious permanent human molars that had not been previously endodontically treated or fractured. Teeth embedded in acrylic resin blocks and enamel of the buccal surfaces of the teeth was removed until the dentin layer. 80 zirconia-based all-ceramic discs were manufactured and cemented on the teeth. The discs had a diameter of 5 mm and a thickness of 2 mm. The samples were divided into two groups according to thermal aging. Thermal aging (10,000) process was applied to 40 specimens. Rely X ARC, Panavia F 2.0, Rely X U-200, Clearfil SA Cement were used in this study. The specimens were loaded in tension at a cross-head speed of 0.5 mm/min on a universal testing machine. Shear bond strength values of the cements with/without thermal aging were compared using two way ANOVA, with a level of statistical significance set at pi 0.05. The bond strength of all specimens decreased significantly after thermal aging.