title: Long-term fluoride release from resin-reinforced orthodontic cements following recharge with fluoride solution.
abstract: The aim of this study was to test the hypothesis that there is no difference in the fluoride release behavior of resin-reinforced glass ionomer cements before or after fluoride recharge. The materials were divided into 5 groups: 2 resin-reinforced glass ionomer cements used for attaching orthodontic bands, that is, group FOB (Fuji Ortho Band) and group MCB (Multi-Cure Glass Ionomer Orthodontic Band Cement); 2 resin-reinforced glass ionomer cements and a composite used for bonding orthodontic brackets, that is, group OGLC (Ortho Glass LC), group FOLC (Fuji Ortho LC), and group TXT (Transbond XT), respectively. Fluoride release was measured during a 60-day period by using selective ion electrodes connected to an ionic analyser. After 4 weeks, the samples were exposed to 0.221% sodium fluoride solution. The results showed that cements achieved a maximum fluoride release 24 h after initial setting. No statistically significant differences were observed between groups FOB and OGLC regarding the amount of released fluoride following fluoride recharge from day 31 to day 36 (p>0.05). In conclusion, FOB and OGLC cements showed a higher capacity of capturing and releasing fluoride compared to the other cements studied.
authors.affiliation: Departament of Orthodontics, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Rogério Lacerda
authors.initials: RL
authors.lastname: dos Santos
authors.forename: Matheus Melo
authors.initials: MM
authors.lastname: Pithon
authors.forename: Delmo Santiago
authors.initials: DS
authors.lastname: Vaitsman
authors.forename: Mônica Tirre de Souza
authors.initials: MT
authors.lastname: Araújo
authors.forename: Margareth Maria Gomes
authors.initials: MM
authors.lastname: de Souza
authors.forename: Matilde Gonçalves da Cunha
authors.initials: MG
authors.lastname: Nojima
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002327:Cariostatic Agents / Q000008:administration & dosage / Q000032:analysis*; D001840:Dental Bonding; D004058:Diffusion; D004337:Drug Carriers; D005460:Fluorides, Topical / Q000008:administration & dosage / Q000032:analysis*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008137:Longitudinal Studies; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D000538:Aluminum Silicates; D002327:Cariostatic Agents; D004337:Drug Carriers; D005460:Fluorides, Topical; C112133:Fuji Ortho; D005899:Glass Ionomer Cements; C516145:Multicure cement; D019279:Resin Cements; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate