Bond strength of resin cements to a hybrid composite

Tensile bond strengths among three resin inlay cements and a light-cured and a post-cured hybrid composite prepared with two different surface treatments and three different bond-enhancing liquids were measured in vitro. The resin cements were bonded to sandblasted hybrid composite, stored at 37 degrees C in 100% humidity overnight, and debonded in tension. Interfacial bond strengths were affected most by the type of pre-bond surface treatment. Hydrofluoric acid produced weaker bond strengths than surface treatment with phosphoric acid. Post-cured Herculite XRV produced weaker bond strengths than the light-cured Herculite XRV. Porcelite cement produced the highest bond strengths. Of the surface enhancers, the acrylic monomer (Special Bond II) produced the highest bond strengths, regardless of which cement or surface preparation was used. Fracture analysis revealed mostly adhesive failures with hydrofluoric acid treatment in both light-cured and post-cured Herculite.