title: Effect of air polishing on the fluoride release of (resin-modified) glass ionomer cements and of a polyacid-modified composite resin.
abstract: Eight different conventional and resin-modified glass ionomers as well as a polyacid-modified composite were air polished and their fluoride release was determined in comparison to untreated controls. The air polishing was done with two different devices at medium and maximum setting for powder and water. Ninety discs of 1.5 mm thickness and 7.0 mm diameter were produced from each cement. These discs were stored in 5 ml deionized water at 37 degrees C. After 1 day and 1, 4, 8, 12, and 16 weeks, the specimens were transferred into new vials with fresh deionized water. From the 4th week onward, the specimens (except for the untreated controls) were air polished on half of their upper and lower surfaces for 2 s each before being put into a new vial. After 20 weeks the fluoride released during the previous 4 weeks was determined with a fluoride ion-sensitive electrode. With the exception of Ketac-Cem, all cements released significantly more fluoride ions after air polishing, irrespective of the devices' settings. The differences in the amount of fluoride released among the investigated materials were greater than the changes in fluoride release patterns caused by air polishing. Air polishing increased the fluoride release by 20-60% in most of the materials investigated.
authors.affiliation: Humboldt University of Berlin, University Hospital Charité, Center for Dentistry, Department of Orthodontics and Dentofacial Orthopedics, Föhrer Strasse 15, D-13353 Berlin, Germany.
authors.forename: P G
authors.initials: PG
authors.lastname: Jost-Brinkmann
mesh_terms: D002327:Cariostatic Agents / Q000737:chemistry*; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D003775:Dental Polishing / Q000379:methods*; D004058:Diffusion; D005459:Fluorides / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D017736:Ion-Selective Electrodes; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D011076:Polycarboxylate Cement / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: C104870:Band-Lok; D002327:Cariostatic Agents; D020770:Compomers; D003188:Composite Resins; C088486:Dyract; C113301:FujiPlus; D005899:Glass Ionomer Cements; C081144:Photac-Fil; D011076:Polycarboxylate Cement; D019279:Resin Cements; D012117:Resins, Synthetic; C084550:Vitremer; C119197:Vivaglass Cem; D014867:Water; D008277:Magnesium Oxide; C040235:Ketac-cem; D005459:Fluorides; D015034:Zinc Oxide