title: The effects of adding fluoride compounds to a fluoride-free glass ionomer cement on subsequent fluoride and sodium release.
abstract: Studies have shown that ions in a glass ionomer matrix are 1-10% of the amounts present in the original glass. To measure more precisely the release from a cement matrix, known amounts of ions were added to LG30 glass which was fluoride and sodium-free. Cement without additions acted as the control. 1.4-1.6% of each of sodium, calcium and aluminum fluorides were added to three portions of control blend. The sodium and fluoride release into deionised water from five discs of each cements blend was measured for 8 months. This represented complete release for sodium but not for fluoride. Traces of fluoride and sodium in the glass produced low but measurable amounts indicating about a third of the fluoride and substantially all sodium present in LG30 was released. The addition of calcium fluoride had no significant effect on sodium or fluoride release and aluminium fluoride minimal effects. Adding sodium fluoride significantly enhanced release of both ions although fluoride release was less than from a glass containing 5% fluoride. Only small proportions of the additions, 2-5% of the fluoride and 13% of sodium, were released. Sodium and fluoride appeared to be released independently. For LG30 cements additives were poor at supplying extra ions.
authors.affiliation: Department of Biomaterials Research, Eastman Dental Institute, 256 Gray's Inn Road, WC1X 8LD, London, UK.
authors.forename: J A
authors.initials: JA
authors.lastname: Williams
authors.forename: E
authors.initials: E
authors.lastname: Briggs
authors.forename: R W
authors.initials: RW
authors.lastname: Billington
authors.forename: G J
authors.initials: GJ
authors.lastname: Pearson
mesh_terms: D000180:Acrylic Resins; D000838:Anions; D002414:Cations, Monovalent; D005459:Fluorides / Q000008:administration & dosage* / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D012822:Silicon Dioxide; D012964:Sodium / Q000008:administration & dosage* / Q000737:chemistry; D012969:Sodium Fluoride / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D000838:Anions; D002414:Cations, Monovalent; D005899:Glass Ionomer Cements; D012996:Solutions; C015897:glass ionomer; D012822:Silicon Dioxide; D012969:Sodium Fluoride; D012964:Sodium; D005459:Fluorides