Abstract
To improve the bonding of light-cured composite resin to dentin, a new monomer, 2-Acryloyloxyethyl hydrogen maleate(2AEM), was prepared by the addition of maleic anhydride to 2-Hydroxyethyl acrylate, was identified by elemental analysis and IR and NMR spectra.Dentin etched and unetched with 0.5M EDTA solution(EDTA)and 37% phosphoric acid solution were treated with 2AEM, and the bond strengths of light-cured composite resin were measured.Also, the resin-dentin interface, and the dentin surfaces after the shear bond test were observed by SEM.When polished dentin was treated with 2AEM for over 3min, the bond strength of light-cured composite resin was higher than that without treatment, and the acid-proof dentin layer was less than 1μm thick at the resin-dentin interface.When etched dentin was treated with 2AEM for 1min, the bond strength was markedly improved, and the thickness of the acid-proof dentin layers was 1μm for EDTA and 3μm for phosphoric acid.When etched dentin was treated, the specimens after the shear bond tests showed resin and dentin cohesion fractures.
