Fluoride recharge of aesthetic dental materials

The objective of the study was to compare the potential for fluoride rechar ge of two glass-ionomer cements, a resin-modified glass-ionomer cement, a c ompomer and a fluoride-containing composite in artificial saliva. Disc samp les of each of the materials were placed into artificial saliva. The fluori de content of the artificial saliva was determined at various intervals up to 57 days. The discs were subjected to a 2 min exposure of NaF (500 parts/ 10(6)). This recharge procedure was repeated at 64 and 120 days. The fluori de release was measured before and after recharge. The fluoride release for all of the materials increased after each exposure to NaF; however, the am ount for the composite was very low. The resin-modified glass-ionomer cemen t displayed the greatest potential for fluoride recharge at 57 and 64 days (P < 0.05). By 120 days, the amount of fluoride released in the 24 h post-r echarge interval had decreased in all the materials. All the materials show ed a potential for fluoride recharge. This effect, however, was minimal in the fluoride-containing composite.