Abstract
The influences of water-soluble compounds and water contents in a self-etching primer on the adhesion between composite resin and teeth were investigated. The self-etching primer was composed of 30 wt% 2-methacryloyloxyethyl phenyl phosphoric acid (Phenyl-P), water-soluble compounds and water. As the water-soluble compounds, 2-hydroxyethyl methacrylate, ethanol and acetone were used. The ratios of water-soluble compounds and water were varied. The bond strengths of composite resin to bovine enamel or dentin were influenced by the kinds of water-soluble compounds used and the water contents in the self-etching primer. The self-etching primer composed of 30 wt% Phenyl-P, 20 wt% ethanol and 50 wt% water gave the highest bond strengths to both enamel and dentin. The stable conformations of Phenyl-P, water-soluble compounds and Phenyl-P/Ca salt were obtained using molecular mechanics calculations. We suggest that the conformations of each compound may influence bond strength.
