RESIN-MODIFIED GLASS-IONOMER CEMENTS - FLUORIDE RELEASE AND UPTAKE

The aim was to study the short- and long-term fluoride release from re sin-modified glass ionomer cements (GIC). The aim was also to determin e the effect of fluoride treatment of 9-month-old specimens, consisten cy of the mix, and pH of the environment on the fluoride release. GIC test specimens were continually exposed to running water. and the fluo ride release was measured periodically by storing the specimens in 5 m i deionized water for 1 week and measuring the fluoride content of the solution, After 24 h, I month, 9 months, and 11 months in running wat er four of the six resin-modified GICs released as much as or more flu oride than the auto-curing GIC tested for comparison. Fluoride treatme nt after 9 months also increased the fluoride release of these four br ands, as was the case with the conventional GIG. At ? h and 1 month tw o of the resin-modified GICs released smaller amounts of fluoride than the other materials, and the fluoride treatment used on those had no or only a minimal effect. Thin consistency of a mix resulted in higher fluoride release for one resin-modified material than a thick mix. Lo w pH increased the fluoride release fbr all materials.