title: Fluoride release and recharge from different materials used as fissure sealants.
abstract: OBJECTIVE
  Fluoride release/recharge properties of fissure sealants are important for their long-term inhibition of caries. This study was conducted to examine the relationship between fluoride release and recharge of pit-and-fissure sealants.
  
  
  METHODS
  Specimens were prepared from 5 different sealant materials: Fissurit F, a conventional resin; Fuji VII, a glass-ionomer cement (GIC); Fuji II LC, a resin-modified GIC; Ionosit, a polyacid-modified composite resin (PMRC); and Aelite Flo, a flowable composite resin. Specimens stored in a polyethylene test tube containing 5.0 ml ultrapure water. On day 21, specimens were exposed to 1.23% APF gel. Fluoride release was measured using a fluoride-specific ion electrode at 1-7, 14, 21, 22, 28, 35 and 42 days.
  
  
  RESULTS
  The glass-ionomer based sealants Fuji VII and Fuji II LC had significantly higher fluoride release than the other materials at all times tested (P<.05). Fluoride release of all materials tested increased following exposure to APF gel (P<.05).
  
  
  CONCLUSIONS
  Within the limitations of this short-term study, glass ionomer-based sealants were shown to have higher initial fluoride release as well as higher fluoride recharge capacity than other sealants.
authors.affiliation: Assistant Professor, DDS, PhD, Department of Pediatric Dentistry, Faculty of Dentistry, University of Ondokuz Mayis, Samsun, Turkey.
authors.forename: Sule
authors.initials: S
authors.lastname: Bayrak
authors.forename: Emine Sen
authors.initials: ES
authors.lastname: Tunc
authors.forename: Abdurrahman
authors.initials: A
authors.lastname: Aksoy
authors.forename: Ertan
authors.initials: E
authors.lastname: Ertas
authors.forename: Dilek
authors.initials: D
authors.lastname: Guvenc
authors.forename: Sezin
authors.initials: S
authors.lastname: Ozer