Effect of Universal Primers on the Tensile Bond Strength between Zirconia and Resin Composites

This study aimed to evaluate the effects of universal primers on the tensile bond strength between zirconia and resin composites. Zirconia specimens were divided into five groups based on the surface treatment with the following primers: MP (Monobond Plus), SU (ScotchBond Universal), AZ (AZ Primer), BM (Beauty bond Multi), and BL (Bondmer Lightless). After priming, stainless steel rods were bonded to the zirconia specimens with composite resin. The tensile bond strength test was performed: stored at room temperature for 1 day; stored in distilled water at 37 °C for 7 days; and underwent thermal cycling. The BL group demonstrated a significantly higher tensile bond strength than other groups when stored at room temperature for 1 day (p < 0.05). The primer that acted via chemical polymerization appeared to be most effective in improving the bond strength between the two materials in this study.