[Effect of fluoride release on flexural strength of fluoride-containing composites].
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).


CONCLUSIONS
Fluoride release affects mechanical properties of fluoride-containing composites.
Wang
X
X
Department of Operative Dentistry, Cariology and Endodontology, Peking University School of Stomatology, Beijing 100081, China.
Gao
X
X
Wang
J
J
D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D018583:Pliability
D003188:Composite Resins; D003764:Dental Materials; D005459:Fluorides