Adhesive bond strengths using self- and light-cured composites

To evaluate the microtensile bond strength (microTBS) of four adhesive systems to dentin, using self- and light-cured resin composites.

Crowns of human molars were separated from the roots, and the occlusal surfaces were ground to obtain flat superficial dentin. Three etch-and-rinse adhesives--All-Bond 2, One-Step Plus, and OptiBond Solo Plus--and one self-etching primer system, Peak SE, were evaluated. Each adhesive group was divided into two subgroups according to the type of resin composite used. A self-cured (Bisfil 2B) or light-cured (Filtek Supreme Plus) resin composite build-up was incrementally inserted to the dentin after each adhesive system was applied. The bonded specimens were stored in water for 24 h and sectioned into beams. Microtensile testing was done, and the data were subjected to ANOVA and Fisher's PLSD test.

The microTBS of All-Bond 2 and One-Step Plus was not affected by the type of resin composite used (p=0.3131 and p=0.1562, respectively). The microTBS of OptiBond Solo Plus was significantly reduced when used with self-cured resin composite (p<0.0001). Peak SE formed no bond of self-cured resin composite to dentin.

Some adhesives do not effectively bond self-cured resin composite to dentin.

Incompatibility between adhesives with low pH and certain self-cured resin composites can cause clinical debonding of restorations.