Effect of carbamide peroxide bleaching on the shear bond strength of composite to dental bonding agent enhanced enamel.
BACKGROUND
Carbamide peroxide bleaching has been implicated in adversely affecting the bond strength of composite to enamel.


OBJECTIVE
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.


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.


CONCLUSIONS
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.
Sung
E C
EC
School of Dentistry, University of California at Los Angeles, CA 90095-1668, USA. ericsung@ucla.edu
Chan
S M
SM
Mito
R
R
Caputo
A A
AA
D000704:Analysis of Variance; D000077463:Carbamide Peroxide; D003188:Composite Resins / Q000494:pharmacology*; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D004338:Drug Combinations; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D008689:Methacrylates / Q000494:pharmacology*; D008963:Molar; D010545:Peroxides / Q000494:pharmacology*; D019279:Resin Cements / Q000494:pharmacology*; D013718:Tensile Strength / Q000187:drug effects; D014073:Tooth Bleaching / Q000379:methods*; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology
C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D008689:Methacrylates; C092987:Optibond; D010545:Peroxides; D019279:Resin Cements; C100742:All-Bond 2; D000077463:Carbamide Peroxide; D014508:Urea