By J. GEIRSSON, A.V. RITTER, H.O. HEYMANN, and E.J. SWIFT Jr. Department of Operative Dentistry, University of North Carolina at Chapel Hill
This investigation evaluated the in vitro bond strengths of a new light-cured self-etching one-bottle dental adhesive (iBond, Heraeus Kultzer) when applied to 600-grit polished bovine enamel and dentin surfaces. The control materials were Gluma Comfort Bond + Desensitizer, a "traditional" etch-and-bond one-bottle light-cured dental adhesive, and Prompt L-Pop, a commercially available "self-etching" light-cured adhesive. Sixty bovine incisors were mounted in phenolic rings with cold-cure acrylic resin. The labial surface of each tooth was ground to expose enamel (n=30) and dentin (n=30). A resin-based composite (Charisma) post was bonded to the treated enamel or dentin surface, and bond strengths were determined in shear mode 24 hr after bonding using an Instron universal testing machine. Means shear bond strengths varied from 17.02 MPa (Gluma Comfort Bond + Desensitizer, dentin) to 5.11 MPa (Prompt L-Pop, dentin). iBond resulted in bond strengths to enamel that were not statistically different than the enamel bond strengths obtained with Gluma Comfort Bond + Desensitizer and with Prompt L-Pop. In dentin, iBond produced bond strengths significantly higher than Prompt L-Pop, and significantly lower than Gluma Comfort Bond + Desensitizer. iBond bond strengths to enamel and dentin were comparable. In conclusion, the new light-cured self-etching adhesive iBond provides similar bond strengths to enamel, but lower bond strengths to dentin, than a proven "etch-and-bond" adhesive.