title: Fluoride release and uptake in vitro from a composite resin and two orthodontic adhesives.
abstract: The aim of this study was to investigate the fluoride release and uptake characteristics of a composite resin (Tetric) and two orthodontic adhesives (VP 862 and Saga Bond), with a type-II glass ionomer cement (Ketac Fil) as a control. Test specimens in 2 ml deionized water released fluoride over a period of 33 days. Ketac Fil released 54 and 15 times more fluoride than Tetric after 24 h and 1 month, respectively, whereas the two adhesives released amounts between these values. Specimen exposure to 1000-ppm NaF solution increased the 24-h fluoride release from all materials, with near pre-exposure levels reached after 2-3 days. Ketac Fil had a tendency to recharge not seen with the other materials. The ytterbium trifluoride filler in Tetric has a very low water solubility, and it is therefore suggested that the increases in fluoride release from Tetric after exposure to fluoride were most probably due to release of surface-retained fluoride.
authors.affiliation: Department of Operative Dentistry and Endodontics, Faculty of Dentistry, University of Oslo, Norway.
authors.forename: A
authors.initials: A
authors.lastname: Young
authors.forename: F R
authors.initials: FR
authors.lastname: von der Fehr
authors.forename: T
authors.initials: T
authors.lastname: Sønju
authors.forename: H
authors.initials: H
authors.lastname: Nordbø
mesh_terms: D000269:Adhesives / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods; D005459:Fluorides / Q000032:analysis / Q000737:chemistry*; D005460:Fluorides, Topical / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D009930:Organic Chemicals; D009967:Orthodontic Appliances; D012995:Solubility; D015018:Ytterbium / Q000737:chemistry
chemical_list: D000269:Adhesives; D003188:Composite Resins; D003738:Dental Cements; D005460:Fluorides, Topical; D005899:Glass Ionomer Cements; D008298:Maleates; D009930:Organic Chemicals; C082015:Saga Bond; C090969:Tetric; C074578:VP 862; C102799:ytterbium fluoride; C040964:Ketac-Fil; D015018:Ytterbium; D005459:Fluorides