Bacterial adherence to bleached surfaces of composite resin in vitro.
OBJECTIVE
The effect of bleaching agents on bacterial adherence to polished surfaces of composite resin restorations was assessed in vitro.


METHODS
Samples of light-curing composite resins were treated with either 10% carbamide peroxide or 10% hydrogen peroxide for 1, 3, or 7 days. Bacterial adherence of Streptococcus mutans, Streptococcus sobrinus, and Actinomyces viscosus to the treated resin samples was analyzed and compared with adherence to nonbleached controls.


RESULTS
A 10% solution of carbamide peroxide caused a significant increase in surface adherence of Streptococcus mutans and Streptococcus sobrinus after 3 days (P < .01). A 10% solution of hydrogen peroxide caused a significant increase in surface adherence of Streptococcus mutans and Streptococcus sobrinus after 3 and 7 days (P < .01). A decrease in adherence of Actinomyces viscosus was found after treatment with 10% hydrogen peroxide for 7 days (P < .05).


CONCLUSIONS
It appears that bleaching agents may affect adherence of certain cariogenic microorganisms to the outer surfaces of composite resin restorations.
Mor
C
C
Department of Endodontics, Hebrew University-Hadassah Faculty of Dental Medicine, Jerusalem, Israel.
Steinberg
D
D
Dogan
H
H
Rotstein
I
I
D016924:Actinomyces viscosus / Q000187:drug effects / Q000502:physiology; D001422:Bacterial Adhesion / Q000187:drug effects*; D000077463:Carbamide Peroxide; D003188:Composite Resins; D004338:Drug Combinations; D006244:Hardness; D006861:Hydrogen Peroxide / Q000494:pharmacology; D010545:Peroxides / Q000494:pharmacology*; D018709:Statistics, Nonparametric; D013295:Streptococcus mutans / Q000187:drug effects / Q000502:physiology; D016986:Streptococcus sobrinus / Q000187:drug effects / Q000502:physiology; D013499:Surface Properties; D014073:Tooth Bleaching / Q000009:adverse effects*; D014508:Urea / Q000031:analogs & derivatives / Q000494:pharmacology
D003188:Composite Resins; D004338:Drug Combinations; D010545:Peroxides; C100748:Polofil Molar; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide