Fluoride releasing and uptake capacities of esthetic restorations.

BACKGROUND AND OBJECTIVES The purpose of this study was to evaluate and compare in vitro the fuoride release and uptake from 5 different esthetic restorative materials. MATERIALS AND METHODS Materials tested were conventional GIC - Fuji 7, GC (group1), resin modifed GIC - Vitremer, 3M ESPE (group 2), polyacid modifed composite - Dyract, Dentsply (group 3), fuoride releasing composite - Tetric ceram, Ivoclar Vivadent (group 4), Giomer-Beautifl, Shofu (group 5). Fluoride release was estimated at 6th, 24th, 48th hour and weekly interval for 5 weeks. For fuoride recharge, each specimen was exposed to 2 ml of 1.23% APF gel for 4 minutes and fuoride release measured at 1st, 2nd, 3rd day and 7th day. The fuoride release and recharge was measured using fuoride ion specifc electrode. RESULTS ANOVA and Tukey HSD test were used for statistical analysis. During tested period all materials showed statistically different capability to release and uptake fuoride. Groups 1 and 2 results were comparable in fuoride release. Similarly groups 3 and 5. Groups 1 and 2 vs 3, 4, 5 were statistically very highly signifcant. Only conventional GIC showed initial 'burst effect'. INTERPRETATION AND CONCLUSION Materials tested showed potential for fuoride release and recharge. Different esthetic materials had variable fuoride release hence selection of materials should be guided by specifc clinical situations.