title: Fluoride release from light-curing restorative materials.
abstract: OBJECTIVE
  To measure the in vitro fluoride release from three polyacid-modified resin-based composites (Dyract AP, Compoglass F, F2000) and one resin-modified glass-ionomer cement (Vitremer VLC) for 28 days in two different buffer solutions.
  
  
  METHODS
  30 cylindrical specimens of each material were prepared. Subsequently, 15 samples of each material were stored in neutral (pH 6.8) and acidic (pH 4.0) buffer solution (5 mL), respectively. After 4, 8, 12 hrs and 1, 2, 4, 8, 14 days, respectively, the samples were transferred into new solutions. The fluoride content was determined with a fluoride sensitive electrode. Data were analyzed with ANOVA, followed by closed-test-procedure based on Kruskal-Wallis.
  
  
  RESULTS
  Compared to the neutral solution, all materials showed a significantly higher release of fluoride in acidic environment within the 28-day period (P < 0.001, ANOVA). In acidic buffer solution Vitremer VLC and Compoglass F showed a significantly higher fluoride release than F2000 and Dyract AP (P < 0.001, closed-test-procedure). In neutral solution Dyract AP showed the significantly lowest release (P < 0.001, closed-test-procedure). Fluoride release from the materials tested is higher in an acidic environment than in a neutral environment.
authors.affiliation: Department of Operative Dentistry and Periodontology, School of Dental Medicine, Albert-Ludwigs University of Freiburg, Germany. mueller@zmk2.ukl.uni-freiburg.de
authors.forename: U
authors.initials: U
authors.lastname: Müller
authors.forename: A M
authors.initials: AM
authors.lastname: Kielbassa
authors.forename: J
authors.initials: J
authors.lastname: Schulte-Mönting
authors.forename: E
authors.initials: E
authors.lastname: Hellwig
mesh_terms: D000704:Analysis of Variance; D002021:Buffers; D002327:Cariostatic Agents / Q000737:chemistry*; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004058:Diffusion; D005459:Fluorides / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D002021:Buffers; D002327:Cariostatic Agents; C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; C088486:Dyract; C118368:F2000 cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; D019279:Resin Cements; D017640:Silicates; C084550:Vitremer; D005459:Fluorides