title: Fluoride release by glass ionomer cements, compomer and giomer.
abstract: BACKGROUND
  To measure the amounts of fluoride released from fluoride-containing materials, four glass ionomer cements (Fuji IX, Fuji VII, Fuji IX Extra and Fuji II LC), a compomer (Dyract Extra) and a giomer (Beautifil) were used in this study.
  
  
  METHODS
  Twenty cylindrical specimens were prepared from each material. The amount of released fluoride was measured during the first week and on the days 14 and 21 by using specific fluoride electrode and an ionanalyzer. The results were statistically analyzed using analysis of variance (two-way ANOVA) and Tukey Kramer multiple comparison tests (p=0.05).
  
  
  RESULTS
  Significant differences were seen in fluoride release of different days and materials (p<0.05). The maximum cumulative fluoride release of days 1-7 was related to Fuji VII, followed by Fuji IX Extra, Fuji II LC, Fuji IX, Dyract Extra and Beautifil in descending order and this order remained the same until the 21(st) day.
  
  
  CONCLUSIONS
  Fuji IX, Fuji VII, Fuji IX Extra, and Fuji II LC released higher amounts of fluoride compared to Beautifil and Dyract Extra in this study. It seems that the extent of the glass ionomer matrix plays an important role in determining the fluoride releasing ability of glass ionomer cement materials.
authors.affiliation: Associate Professor, Department of Restorative Dentistry and Torabinejad Dental Research Centre, School of Dentistry, Isfahan University of Medical Sciences, Isalmic Khorasgan Azad University, Isfahan, Iran.
authors.forename: Sayed Mostafa
authors.initials: SM
authors.lastname: Mousavinasab
authors.forename: Ian
authors.initials: I
authors.lastname: Meyers