Effect of aging on dentin bonding

The purpose of this paper was to evaluate the effect of aging of dentin on the tensile bond strengths of four dentin bonding systems using proximal dentin of premolars extracted from young (aged from 9-21 years) and old (aged from 42-64 years) patients. Clearfil Linerbond System and Super Bond D-Liner showed higher bond strengths to both young and old teeth than those of Clearfil Photo Bond and Resto Bond 3. However, similar bond strengths to both young and old teeth for all four products were obtained despite the effects of aging. Furthermore, a SEM study of the site of bond failure revealed the persistence of the resin impregnated layer on the dentin surface, in spite of the difference of bonding system and dentin, indicating that adhesive failure tended to occur at the interface between the bonding resin and the resin impregnated layer.