Abstract
Bonding of MMA-TBB resin to 10% citric acid etched dentin was investigated. The permeability of the dentin was improved by Triton X-100 (TX) and 5% glutaraldehyde in ethanol (GA/EtOH) which can immobilize water-soluble proteins in the demineralized substrate. Measurement of tensile bond strength and SEM observation of fractured surfaces were carried out. When demineralized dentin was treated with TX, the bond strength was 0.8 MPa and adhesive failure was identified. However, when treatment with GA/EtOH was added after TX, the bond strength increased significantly to 13.9 MPa (p<0.05) and the fracture mode changed to cohesive failure in the cured resin. It was concluded that the bonding became possible by the double pretreatment. Glutaraldehyde immobilized the water-soluble proteins. The MMA could be impregnated into the dentin and polymerized in situ forming the hybridized dentin.
