Abstract
The influences of primers and dentin conditioning on bond strength of PMMA/MMA resin to dentin were studied using an initiator system consisting of barbituric acid, copper salt and quaternary ammonium chloride. While N-(2-methacryloxythyl)-2-pyrrolidone primer produced higher bond strength than HEMA primer, HEMA primer containing glutaraldehyde (Gluma) gave the highest bond strength. Pretreating dentin with 10% phosphoric acid containing 3% copper chloride (10 P-3 Cu) for 30s followed by rinsing with water for 30s produced significantly higher bond strength than the same conditioning for 10 s each regimen. The highest bond strength to dentin of PMMA/MMA resin, formulated with 2% 1-cyclohexyl-5-ethylbarbituric acid, 0.003% copper acetyl acetonate and 0.06% vinylbenzyltetradecyldimethylammonium chloride, was obtained after pretreating dentin with 10P-3Cu for 30 s and rinsing with water for 30 s followed by application of Gluma.
