Fluoride release of Vitremer in different powder/liquid ratio compared to two pit and fissure sealants

Abstract

The purpose of this in vitro study was to evaluate the fluoride (F) release of Vitremer/3M in 3 groups with different powder/liquid ratios (VT 1:1, VT ½:1 e VT ¼:1) in comparison with two sealants FluroShield/Dentsply (FS) and Vitro-Seal Alpha/DFL (VS). Eight specimens were submitted to a pH-cycling system. They were immersed alternatively in de (6h) and re-mineralization solutions (1 h), while 8 specimens were immersed in agitated non ionized water at 37oC, exchanged daily during 15 days. The F concentration released in 24 hour periods, in 7 and 15 days, was measured by using the ion specific electrode (Orion 9609), after buffering with TISAB II. Vitremer in the powder/liquid ratio of ½:1 and ¼:1 both in water and in de/re-mineralization solutions had a higher F release when compared to the other groups, as revealed by the results of the ANOVA and the Tukey’s test (p < 0,05). There were no significant differences between VT ½ and VT ¼ in de and re-mineralization solutions. Thus, the alteration of the Vitremer consistence, as far as the fluidity is concerned, suggests that it may be a favorable alternative concerning the F release.