Fluoride release and recharge in giomer, compomer and resin composite

Objectives. The aim of this study was to examine the fluoride recharging and releasing abilities of resin-based materials containing fluoridated glass filler to determine whether the extent of the glass–ionomer matrix of the material affects these properties. Methods. Three materials having a different proportion of the hydrogel matrix surrounding the glass filler, namely: Reactmer paste, Dyract AP and Xeno CF, were used for this study. Five disk specimens of each material were placed into distilled/deionized water and the fluoride release measured during 38 days. For fluoride recharge the disks were exposed to 250 ppm F solution for 1 h and the pre- and post-recharge fluoride release were determined using an ion-selective electrode (total fluoride ions) and ion chromatography (free fluoride ions). Results. The amounts of total and free fluoride release from each material at the initial period in descending order were Reactmer paste>Dyract AP>Xeno CF ( p