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Abstract

Glass ionomer cements (GICs) are an important class of biomedical material used extensively for color matched mercury free, dental restorations. GICs can release clinically beneficial amounts of fluoride and have acceptable handling properties which make them suitable as dental restoratives. The fluoride release of model GICs produced from specially synthesized fluoro-alumino-silicate glasses was studied. Nine glasses of varying fluoride content based on 4.5SiO(2)-3Al(2)O(3)-1.5P(2)O(5)-(5-Z)CaO-ZCaF(2) were synthesized and cement disks were prepared from them. The glass transition temperature reduced with increasing fluorine content of the glass. Fluoride ion release was measured into distilled water as a function of time for up to 140 days using a fluoride ion selective electrode. The quantity of fluoride released was found to be proportional to the fluorine content of the glass at all intervals time. The cumulative fluoride release was proportional to square root time. Substituting strontium for calcium in the glass had little influence on the fluoride release behavior of the cements.

New Pre-reacted Glass Containing Dental Composites (giomers) with Improved Fluoride Release and Biocompatibility

“…The major mechanism of fluoride ion release in giomers is an ion exchange process, with a fluoride ion being exchanged for a hydroxyl ion [55]. It is speculated that the PRG fillers promote fluoride release through a ligand exchange within the pre-reacted hydrogel [10,19].…”

Comparative Evaluation of Fluoride Release From Two Different Glass Ionomer Cement and a Novel Alkasite Restorative Material - An in Vitro Study

“…The filler content and nature of the glass-ionomer hydrogel matrix phase is responsible for fluoride release. The powder-liquid ratio of two-phase-systems, mixing procedure, curing time and the amount of exposed area as well as the different storage media affect the fluoride release [7]. The specimens in the current study were not coated with any adhesives or protective agents from moisture contaminants.…”

Fluoride exchange by glass-ionomer dental cements and its clinical effects: a review

“…Certainly, these cements give substantial sodium release [ 27 ], and studies have shown that the kinetics of this release matches that of fluoride [ 35 ]. Against that, some of the experimental glasses studied have had much simpler compositions, and not contained any sodium, or any other ion that can form simple soluble salts with fluoride [ 31 ]. In these cements, therefore, it may be that fluoride release occurs mainly by a hydroxide-for-fluoride exchange.…”