The effect of surface treatment on the bond strength of resin composite todentin

The purpose of this study was to investigate the effect of various dentin a cid treatments on the tensile bond strength of resin composite to dentin, m ediated by Prisma Universal Bond 2. Acid solutions (maleic acid, Na-EDTA, p hosphoric acid, citric acid/ferric chloride) were applied to dentin surface s for 15 seconds or 60 seconds, and tensile bond strengths evaluated. For a ll acids, there was a significant difference in bond strength for the two t reatment times; for phosphoric acid and citric acid/ferric chloride, the 15 -second application resulted in a higher bond strength, while the reverse w as true for Na-EDTA (sodium-EDTA) and maleic acid. The highest bond strengt h (19.6 MPa) was associated with 15-second citric acid/ferric chloride appl ication, and the lowest bond strength (5.6 MPa) with 60-second application of citric acid/ferric chloride. The bond strengths with 60-second citric ac id/ferric chloride (5.6 MPa), 15-second Na-EDTA (5.8 MPa), and 60-second ph osphoric acid (6.3 MPa) were not significantly different from the control ( 5.7 MPa).