Abstract
Three kinds of MMA-TBB resin, containing 5% 4-META, 5% Phenyl-P and 5% HNPM that have both hydrophilic and hydrophobic groups, and pure MMA-TBB resin were prepared. I investigated the relation between bond strength of these resins to 10-3 treated dentin, and the penetration into dentin of adhesion promoting monomers.
Bond strength to dentin of MMA-TBB resins containing 4-META and Phenyl-P showed higher values (18〜19 MPa). SEM and TEM suggested that 4-META and Phenyl-P promoted monomers to penetrate into dentin, and concentrated on the subsurface layer of resin reinforced dentin, because the two methacrylates had good affinity for dentin powder. For Phenyl-P, bond strength was low when the dentin surface was not sufficiently dry.
The concentration of 4-MET in the MMA solution influenced the bond strength to dentin and the highest value of 24.5 MPa was noted at 3%.
