Effect of carbamide peroxide bleaching on the shear bond strength of composite to dental bonding agent enhanced enamel

• Published in: The Journal of prosthetic dentistry 1999-11, Vol.82 (5), p.595-599
• Main Authors: Sung, E.C., Chan, S.M., Mito, R., Caputo, A.A.
• Format: Article
• Language: English
• Subjects: Analysis of Variance; Carbamide Peroxide; Composite Resins - pharmacology; Dental Bonding; Dental Enamel - drug effects; Dentin-Bonding Agents - pharmacology; Dentistry; Drug Combinations; Humans; In Vitro Techniques; Materials Testing - methods; Materials Testing - statistics & numerical data; Methacrylates - pharmacology; Molar; Peroxides - pharmacology; Resin Cements - pharmacology; Tensile Strength - drug effects; Tooth Bleaching - methods; Urea - analogs & derivatives; Urea - pharmacology
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/S0022-3913(99)70060-0

Statement of problem. Carbamide peroxide bleaching has been implicated in adversely affecting the bond strength of composite to enamel. Purpose. This in vitro study evaluated the effect of 3 dental bonding agents (OptiBond, All-Bond 2, One-Step) on the shear bond strength of a hybrid composite to enamel which was treated by a 10% carbamide peroxide bleaching system. Material and methods. Cylinders of composite were bonded to carbamide peroxide-treated enamel on extracted human teeth using 3 dental bonding agents. After thermocycling, shear bond strengths were determined with a universal testing machine. Results. OptiBond aided bond strengths were 23.7 ± 5.6 MPa to bleached and 19.6 ± 2.9 MPa to unbleached enamel. For All-Bond 2, bleached enamel exhibited bond strengths of 14.9 ± 4.0 MPa and unbleached enamel exhibited a bond strength value of 20.4 ± 2.3 MPa. The composite bond strength for One-Step was 13.6 ± 5.9 MPa to bleached and 23.0 ± 3.9 MPa to unbleached enamel. There was no statistical difference between OptiBond (alcohol base) aided bond strengths for bleached and unbleached enamel; however, the bond strength of composite to bleached enamel with All-Bond 2 or One-Step (acetone base) was significantly lower than unbleached controls. Conclusion. The effect of bonding agent usage on composite bond strength to enamel bleached with a particular carbamide peroxide was dependent on the bonding agent used. (J Prosthet Dent 1999;82:595-9.)