Abstract
The effectiveness of various dentin primers on the adhesion between the composite resin and polished dentin without pretreatment was investigated.As the main components of dentin primers, methacryloyl tyrosine amide(MTYA)and glyceryl methacrylate(GM)were used.Fresh bovine dentin was prepared by grinding with #800 and #1000 stones under running water and then treated with each kind of dentin priner for 60s.Then Clearfil New bond® and Clearfil F II® were applied onto the primed surface.The tensile bond strength between the composite resin and dentin was measured after one day immersion in 37℃ water.The dentin primer MTYA・GM(3% MTYA+35% GM aqueous solution)treatment gave the mean bond strength of 8MPa, and MTYA・G・GM(A:6% MTYA+70% GM aqueous solution, B:2% glutaraldehyde aqueous solution)treatment that of 11MPa.When succinic acid was added to the B part of MTYA・GM and MTYA・G・GM at the concentration of 3%, a high bond strength was obtained by a 10-min application and 5-to 10-min application to the dentin, respectively.The dentin primer MTYA・G・GM・S3(A:6% MTYA+70% GM aqueous solution, B:3% succinic acid+2% glutaraldehyde aqueous solution), gave a mean bond strength of 13MPa by a 30s scrubbing.
