Fluoride release profiles of mature restorative glass ionomer cements after fluoride application

• Published in: Biomaterials Vol. 21; no. 5; pp. 475 - 482
• Main Authors: De Witte, An M.J.C., De Maeyer, Erna A.P., Verbeeck, Ronald M.H., Martens, Luc C.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2000; Elsevier Science
• Subjects: Biological and medical sciences; Capsules; Coated Materials, Biocompatible - chemistry; Fluoride application; Fluoride release; Fluoride uptake; Fluorides - analysis; Fluorine compounds; Glass Ionomer Cements - chemistry; Glass ionomers; Halogenation; Ionomers; Kinetics; Materials Testing; Medical sciences; Polymeric glass; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Resins, Plant; Restorative dentistry; Technology. Biomaterials. Equipments. Material. Instrumentation; Glass ionomers; Fluoride uptake; Restorative dentistry; Fluoride application; Fluoride release; Ionomer; Dental restoration; Cement; Glass; Fluorination; Resins; Comparative study; Release; Physicochemical properties; Biomedical engineering
• ISSN: 0142-9612; 1878-5905
• DOI: 10.1016/S0142-9612(99)00188-X

This study investigates the fluoridation of four conventional glass ionomer cements (GIC) (ChemFil Superior encapsulated, Fuji Cap II, Ketac-Fil and Hi Dense) and three resin-modified GIC (RM-GIC) (Fuji II LC encapsulated, Photac-Fil and Vitremer). The fluoride release of matured restorative GIC was measured as a function of time, after four repeated fluoridations in a 2% NaF aqueous solution for 1 h. This release was corrected for the intrinsic release as determined with a control group. It was demonstrated that application of fluoride is capable of recharging GIC but the subsequent high fluoride release only lasts for one or a few days. Moreover, the fluoride release behaviour depends on the cement formulation. Comparable to the intrinsic release, the net fluoride release after fluoridation is composed of a short- and a long-term process, the former being predominant after fluoridation. The total amount of fluoride released according to the short-term process increases with consecutive fluoridations. This is especially pronounced for the RM-GIC, who exhibit a relatively slow release after fluoridation as compared to the conventional GIC. An explanation for these results is suggested on the basis of the physicochemistry of the setting reaction of the cements and of the fluoridation process.