Effect of the internal glaze on pull-off bond strength between Rely X Ultimate resin cement and zirconia crown
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Abstract
Objectives: To evaluate the effect of the internal glaze of Ceramill ZI zirconia crown on pull-off bond strength using RelyX Ultimate resin cement.
Materials and Methods: Twenty-four human upper premolar teeth were obtained. The teeth were prepared to create a flat occlusal surface, 16° total occlusal convergence, 0.8 mm deep chamfer margin, and 4 mm height. All specimens were divided randomly into two groups as internal glaze (ING) (n=12) and control groups (n=12). Each specimen was scanned and designed to fabricate 2 mm thickness crown. Subsequently, zirconia discs were milled and sintered. For the ING group, the internal surface of crowns was glazed by VITA AKZENT Plus glazing spray. The glaze surfaces were etched with 10% HF for 20 seconds, rinsed, cleaned, and air-dried. Single Bond Universal was applied to the specimens. Then, each specimen was cemented with RelyX Ultimate resin cement and the 50 N (Newton) load was applied during cementation. The crown pull-off test was performed by using a universal testing machine at a constant crosshead speed of 1 mm/min. A T-test was used for statistical analysis. The tooth surface and zirconia crowns from the crown pull-off test were examined by a light microscope and scanning electron microscope.
Results: Compared to the control group, the mean pull-off bond strength of internal glaze group groups did not increase the bond strength of resin cement to zirconia crown. Both groups show mixed failure mode (adhesive and cohesive).
Conclusion: Within the limitations of this study, using internal glazing under our study design did not improve the bond strength of resin cement to the zirconia crown.
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