Abstract
Dentin bonding was studied using MMA/PMMA resin initiated by 2-methyl-1, 3-cyclohexanedione(MCHD)/cupric acetylacetonate(CAA)/vinylbenzyltetradecyldimethylammoniumchloride(VB14)system.Use of a 10% phosphoric acid conditioner containing 2〜9% FeCl_3 and 2-hydroxyethyl methacrylate(HEMA)primer was significantly effective:Mean bond strengths of 12.7〜17.6MPa were obtained under optimal conditions, which were not less than the value obtained with 4-META-MMA/TBB resin.The addition of initiator component, 1, 6-hexanediol demethacrylate, or glutaraldehyde to the HEME primer was advantageous in stabilizing bond strength.Cohesive failure occurred just above the dentin surface in tensile bond strength testing.FT-Raman spectroscopic study suggested that it was due to the increased residual monomer there, which in turn was correlated with the phenomenon that polymerization and curing of the MCHD resin was extremely delayed when a thin layer was applied.
