Effect of accelerated aging on the bonding performance of fuoridated adhesive resins

The purpose of this study was to investigate the dentin bond durability of a one-step, fuoride-containing, glass ionomer-based adhesive system, Reactmer Bond (RB), and that of a two-step, fuoride-containing, self-etch adhesive system, Clearfl Protect Bond (CPB). Enamel was removed from the occlusal surfaces of teeth, and fat dentin surfaces were entirely covered with a composite resin following the application of an adhesive material (n=10). After specimens were sectioned into rectangular sticks of 0.87±0.03 mm2, the sticks were randomly assigned into two accelerated aging time period groups: 1 week or 1 year. Microtensile bond strengths were determined. Bond strength of RB increased significantly after 1 year (1 week=27.80±10.57 MPa versus 1 year=36.93±14.38 MPa) (p<0.05). In contrast, there was no significant difference in bond strength between the two time periods for CPB (1 week=51.74±17.8 MPa versus 1 year=56.03±18.85 MPa) (p>0.05). Both fluoride-containing adhesives seemed to demonstrate reliable bonding performance after 1 year of accelerated aging in water.