Abstract
Seven types of amide monomers, methacryloyl tyrosine amide (MTYA), p-methacryloxybenzamide (p-MBA), p-methacryloxybutoxybenzamide (p-MBBA), o-methacryloxybutoxybenzamide (o-MBBA), p-methacryloxybutoxy phenylpropionamide (p-MBPPA), 3, 5-dimethacryloxybenzamide (3, 5-DMBA), and 3, 5-di (methacryloxybutoxy) benzamide (3, 5-DMBBA), were prepared for use as bonding agents. The monomers were dissolved in HEMA. Bovine enamel was etched with 40% phosphoric acid, and bovine dentin was etched with 10% citric acid before being primed with MTYA·G·H. The tensile bond strengths between bovine enamel or dentin and experimental adhesives were measured after one day immersion in water at 37°C. HEMA was used as a control adhesive.
When bonding to etched enamel, the bond strengths of composite resins with o-MBBA and 3, 5-DMBA were significantly higher than those with HEMA. The bond strengths of composites with MTYA, p-MBA, p-MBBA, 3, 5-DMBBA and p-MBPPA were almost the same as those with HEMA. When bonding to dentin, the bond strengths of composite resin with MTYA and p-MBBA were significantly higher than those with HEMA.
