In vitro bond strengths of three current dentin adhesives to primary and permanent teeth.

The in vitro shear bond strengths of three chemically different dentin bonding agents were tested between both permanent and deciduous dentin and their respective anterior composite filling materials. The effect of the post-mortem age of the teeth on bond strength was evaluated by comparison of fresh (extracted within 24 h) and old (extracted within 10 d) teeth. The results indicated that these materials bonded more strongly to the dentin of permanent than to deciduous teeth (8.8 +/- 4.9 MN/m2 vs. 6.2 +/- 4.8 MN/m2). The intermaterial comparison indicated that the bonds to dentin were strongest for Scotchbond 2 (12.3 +/- 4.4 MN/m2) followed by Tenure (6.9 +/- 3.3 MN/m2) and then Gluma (3.3 +/- 1.7 MM/m2). Both the above findings were shown to be statistically significant. The effect of time lapse after extraction of the teeth was not statistically significant.