title: Do conventional glass ionomer cements release more fluoride than resin-modified glass ionomer cements?
abstract: OBJECTIVE
  The aim of this study was to evaluate the fluoride release of conventional glass ionomer cements (GICs) and resin-modified GICs.
  
  
  METHODS
  The cements were grouped as follows: G1 (Vidrion R, SS White), G2 (Vitro Fil, DFL), G3 (Vitro Molar, DFL), G4 (Bioglass R, Biodinâmica), and G5 (Ketac Fil, 3M ESPE), as conventional GICs, and G6 (Vitremer, 3M ESPE), G7 (Vitro Fil LC, DFL), and G8 (Resiglass, Biodinâmica) as resin-modified GICs. Six specimens (8.60 mm in diameter; 1.65 mm in thickness) of each material were prepared using a stainless steel mold. The specimens were immersed in a demineralizing solution (pH 4.3) for 6 hr and a remineralizing solution (pH 7.0) for 18 hr a day. The fluoride ions were measured for 15 days. Analysis of variance (ANOVA) and Tukey's test with 5% significance were applied.
  
  
  RESULTS
  The highest amounts of fluoride release were found during the first 24 hr for all cements, decreasing abruptly on day 2, and reaching gradually decreasing levels on day 7. Based on these results, the decreasing scale of fluoride release was as follows: G2 > G3 > G8 = G4 = G7 > G6 = G1 > G5 (p < 0.05).
  
  
  CONCLUSIONS
  There were wide variations among the materials in terms of the cumulative amount of fluoride ion released, and the amount of fluoride release could not be attributed to the category of cement, that is, conventional GICs or resin-modified GICs.
authors: School of Dentistry, Federal University of Amazonas, Manaus, Brazil.
authors: Maria Fernanda Costa
authors: MF
authors: Cabral
authors: Postgraduate Program in Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil.
authors: Roberto Luiz de Menezes
authors: RL
authors: Martinho
authors: School of Dentistry, Federal University of Amazonas, Manaus, Brazil.
authors: Manoel Valcácio
authors: MV
authors: Guedes-Neto
authors: Postgraduate Program in Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil.
authors: Maria Augusta Bessa
authors: MA
authors: Rebelo
authors: Postgraduate Program in Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil. ; School of Health Sciences, State University of Amazonas, Manaus, Brazil.
authors: Danielson Guedes
authors: DG
authors: Pontes
authors: Postgraduate Program in Dentistry, School of Dentistry, Federal University of Amazonas, Manaus, Brazil.
authors: Flávia
authors: F
authors: Cohen-Carneiro
keywords: Dental materials; Fluorides; Glass ionomer cements