Comparative in vitro evaluation of recent enamel and dentin adhesive materials

In this in vitro study, two experimental and four commercially available enamel-dentin bonding agents are characterized by shear bond strengths to human teeth following storage of the specimens for 2 minutes, 15 minutes, and 24 hours, respectively, or after stressing of the bonds by 5000 thermal cycles between 5 degrees and 55 degrees C. It is assumed that the experimental compounds are clinically adequate materials to mediate long-term retention of resin restorations placed without reliance on mechanical undercuts. The limitations of such in vitro strength data regarding clinical performance are discussed and emphasized.