Fluoride Release From Three Different Polyacid-Modified Resin Composites

Objective: The aim of this study was to compare the fluoride release and uptake characteristics of three different polyacid-modified resin composites; Twinky Star(Voco, Cuxhaven-Germany), MagicFil (DMG, Hamburg-Germany) and Dyract Extra (DeTrey Dentsply, Konstanz-Germany). Method: Ten disc-shaped specimens (6 mm diameter and 1.5 mm height) were prepared for each material by using standard teflon moulds. Each disc was immersed in 3 ml of deionized water within a plastic vial and stored at 37ºC. The fluoride concentrations of each solution was determined at 1st, 2nd, 3rd, 7th, 14th, 21th and 28th days. The deionized water in the tubes was changed one day prior to each measurement. At the end of this period, the samples were recharged with 2% NaF solution at weekly intervals. After refluoridation, fluoride amount was measured at 30th, 31st, 32nd, 36th, 44th, 52nd, and 60th days. The fluoride release of all samples was measured with a specific fluoride electrode and an ion analyzer. Statistical analyses were conducted using GraphPad Prism V.3 pocket programme (Friedman, Kruskal Wallis and Dunn's Multiple Comparison tests). Results: For all tested materials, the greatest amount of fluoride release was observed after the first day of the study but gradually diminished with time (p<0.05). After exposure to NaF solution, all materials were recharged and continued releasing fluoride. There was no significant difference in comparison of the amounts of fluoride released from the materials before and after recharging during the test period (p>0.05). Conclusion: The polyacid-modified resin composites used in this study released fluoride. Eventhough the fluoride releasing of polyacid-modified resin composites is determined with this in vitro study; it is need to be supported with the results of in vivo studies.Nonetheless, polyacid-modified resin composites can be used especially for children in high risk for caries.