Abstract
Thiobarbituric acid monomers, 5-allyl-2-thiobarbituric acid(5AS)and 5-(4-vinylbenzyl)-2-thiobarbituric acid(5VS), were utilized to treat the surface of dental metals to enhance the durability of adhesion against water at the adhesion interface between resin and metal.Treatment agents were prepared by dissolving 5AS or 5VS in various solvents.The agent was applied to metal surfaces polished to a mirror-like finish, and the two specimens were butt jointed with MMA-PMMA/TBBO resin.Tensile bond strength measurements were made after 2000 thermal cyclings in water, and the durability of adhesion was evaluated.The introduction of the treatment with the thiobarbituric acid monomers yielded statistically superior bond strengths, and the agent containing 5VS was more effective than that containing 5AS in almost all cases.Ethanol was generally the most suitable solvent for the agent, although acetone demonstrated a specific adhesion to noble metal alloys with the highest bond strength.The bond strengths also depended on the concentration of the monomers in the agent, and excellent adhesion durability against water was observed even at the low concentration of 0.001mole%.Results suggested that treatment with 5VS provided high bond strengths to noble metal alloys rather than base metal alloys and that this bond was durable against water penetration.
