Abstract
This study was designed to further clarify the mechanisms of wet dentin bonding.MMA-TBB or 4-META/MMA-TBB resin was bonded to wet dentin demineralized by 10% citric acid(10-0)or 10% citric acid and 3% ferric chloride(10-3)for 10s and then primed with 5% 4-META in acetone for 60s.Their tensile bond strengths were measured on mini-dumbbell bonded specimens developed to examine the existence of remaining demineralized dentin which shows a defect in the bonded samples.The bond strength of MMA-TBB resin to wet 10-0etched dentin was only 5.7MPa but that of 4-META/MMA-TBB resin increased significantly to 11.9MPa.Those of MMA-TBB and 4-META/MMA-TBB resins to wet 10-3 etched dentin were 14.2 and 18.9MPa, respectively.It was concluded by tensile test and SEM examinations that the hybridized dentin prepared with 4-META/MMA-TBB resin to wet 10-3 treated dentin was excellent and provided good durability.
