Bond strength of composite to enamel and dentin using Prime & Bond 2.1

A laboratory study was conducted to determine the bond strength of composit e to enamel and dentin using a one-component dental adhesive system (Prime & Bond 2.1) with three application regimens ranging from four to seven proc edural steps. In addition, the effect of acid conditioning of dentin on bon d strength was evaluated. Enamel bond strengths ranged from 29.2 to 29.8 MP a, and dentin bond strengths ranged from 18.6 to 21.3 MPa. Enamel bond stre ngths were significantly higher (P = 0.000) than dentin values. There was n o significant difference (P > 0.05) among the bond strengths in either the enamel or dentin groups using the three application regimens. Nor did acid conditioning of dentin increase bond strengths (P = 0.683).