Fluoride uptake and release by composites and glass ionomers in a high caries challenge situation.

Abstract

All materials studied, except for Heliomolar from day 4 to day 7 in the demineralizing solution, were capable of releasing fluoride in measurable quantities during the whole experiment. The fluoride amounts released by Chelon Fil, Vitremer, VariGlass and Dyract were significantly higher in the demineralizing solution (ANOVA, P < 0.05) than in the remineralizing solution, during almost the entire experiment. The fluoride amounts released by Heliomolar were significantly higher in the remineralizing solution (ANOVA, P < 0.05) than in the demineralizing solution, during almost the entire experiment. All materials studied were capable of uptaking fluoride from the dentifrice solution and of later releasing it to the solution, maintaining the release relatively constant and at a higher level than that seen between days 5 and 7.