Fluoride release process of (resin-modified) glass-ionomer cements versus (polyacid-modified) composite resins

Abstract

The fluoride release of conventional and resin-modified glass-ionomers is reviewed and compared to that of fluoride-releasing (polyacid-modified) composite resins. Each formulation displays a typical fluoride release profile. The cumulative amount of fluoride released is described by [F]_c=[F]_It/(t+t_1/2)+β√t for glass ionomers whether resin-modified or not, whereas for composite resins this quantity is given by [F]_c=[F]_It/(t+t_1/2)+αt. Both equations indicate that two kinetic processes are responsible for the fluoride release profiles. The kinetic parameters $\text{[}\text{F}\text{]}{}_{\mathrm{<mtext>I</mtext>}}\text{,}\text{t}{}_{\mathrm{1/2}}\text{,}\text{β}\text{and}\text{α}$ depend on the formulation. On the basis of the exchange characteristics for fluoride, an attempt is made to explain the mechanisms responsible for these fluoride release processes.