title: Comparative study of fluoride released and recharged from conventional pit and fissure sealants versus surface prereacted glass ionomer technology.
abstract: BACKGROUND
  The fluoride release of sealants in vitro shows a marked decrease. Giomers are distinguishable from manufactured resin-based sealants and contain prereacted glass-ionomer particles (PRG).
  
  
  OBJECTIVE
  To compare the amounts of fluoride released from the main pit and fissure of a resin-based sealant with that from a Giomer and to assess the abilities of the sealant and the Giomer to recharge when exposed to regular use of fluoride rinse.
  
  
  METHODS
  The readings for the fluoride concentration were carried out for 60 days using a fluoride ion-specific electrode. After this period, the samples were recharged using a fluoride mouth rinse. The amount of fluoride released after this recharge was determined for 5 days. The data were analyzed using Student's t- and analysis of variance tests.
  
  
  RESULTS
  In general, all materials presented higher fluoride release in the first 24 h; G1 and G4 showed a higher fluoride release in this period. On the other hand, G3 and G1 presented the most constant fluoride release until the 8(th) day, wherein all the sealants considerably decreased in the amount of fluoride released.
  
  
  CONCLUSIONS
  G1 and G3 released higher concentrations of fluoride, although no significant differences were found. Giomers recharged in the first 24 h after polymerization presented an improved and sustained fluoride release.
authors.affiliation: Dental Research Center "Dr. Keisaburo Miyata", School of Dentistry, Autonomus University State of Mexico, Toluca, México.
authors.forename: Elias Nahum
authors.initials: EN
authors.lastname: Salmerón-Valdés
authors.affiliation: Dental Research Center "Dr. Keisaburo Miyata", School of Dentistry, Autonomus University State of Mexico, Toluca, México.
authors.forename: Rogelio J
authors.initials: RJ
authors.lastname: Scougall-Vilchis
authors.affiliation: Dental Research Center "Dr. Keisaburo Miyata", School of Dentistry, Autonomus University State of Mexico, Toluca, México.
authors.forename: Jorge
authors.initials: J
authors.lastname: Alanis-Tavira
authors.affiliation: Sustainable Chemical Research Center, School of Chemistry, Autonomus University State of Mexico, Toluca, México.
authors.forename: Raúl Alberto
authors.initials: RA
authors.lastname: Morales-Luckie
keywords: Fluoride release; giomer; recharge of dental materials; surface prereacted glass ionomer; total ionic strength adjustment buffer