Resumo

SILVA, Fábia Danielle Sales Cunha Medeiros e; DUARTE, Rosângela Marques  e  SAMPAIO, Fábio Correia. Fluoride release and uptake by glass ionomer cements. RGO, Rev. gaúch. odontol. (Online) [online]. 2010, vol.58, n.4, pp. 437-443. ISSN 1981-8637.

OBJECTIVE: Evaluated the fluoride released from six conventional and two resin-modified glass ionomer cements before and after a topical application of a 2% neutral sodium fluoride gel. A composite resin was used as control. METHODS: Five specimens of each material were prepared by the use of a Teflon matrix and immersed in 5.0 ml of deionized water. On days 1,2,3,4,5,6,7 and 14, a specific electrode was used to determine the amount of fluoride released. On day 15, a 2% neutral sodium fluoride gel was applied topically on the specimens for 4 minutes. The specimens were then rinsed, dried and again immersed in 5.0 ml of deionized water. The mount of fluoride released was measured 1, 2 7 and 14 days after fluoride uptake. RESULTS: Analysis of variance, the Tukey's test and the Student's t-test (p<0.05) revealed significant differences between the materials before and after the uptake. The materials that released the greatest amounts of fluoride initially were Maxxion R> Vidrion R> Vitro FIL> Vitro Molar> Vitro Fil LC> Riva Self Cure > Vitremer> Ketac Molar> Z-250. All materials were capable of absorbing fluoride. CONCLUSION: Glass ionomer cements are capable of releasing fluoride in deionized water and absorbing fluoride from a topical application of a 2% neutral sodium fluoride gel.

Palavras-chave : Dental cements; Glass ionomer cements; Dental materials.