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[Effect of fluoride release on flexural strength of fluoride-containing composites]
1Department of Operative Dentistry, Cariology and Endodontology, Peking University School of Stomatology, Beijing 100081, China.
Objective:
To study fluoride release and its impact on flexural strength of fluoride-containing composites.
Methods:
Experimental composite resins containing 0.3%, 0.6% and 1.2% fluoride (w/w) respectively and non-fluoride control composites were selected, including a compomer and its control composites. The amount of fluoride release in vitro was determined with fluoride ion-sensitive electrode in a 30 day consecutive period. The flexural strength was measured by Autograph Machine before and after releasing fluoride in water.
Results:
The amount of fluoride release increased (0, 21.98, 43.98 and 99.91 micrograms.cm-2 respectively) and the flexural strength decreased (101.70, 94.29, 82.03 and 79.84 MPa respectively) while fluoride-contents in resins increased (0%, 0.3%, 0.6% and 1.2% respectively). With fluoride release, the flexural strength decreased significantly (P < 0.05).
Conclusion:
Fluoride release affects mechanical properties of fluoride-containing composites.