Avaliação da liberação de íon fluoreto de cimentos ionoméricos antes e após a recarga e com proteção da superfície

Abstract

Was evaluated the fluoride ion release of 2 glass ionomer cements (GIC) and anhydrous 2 resin-modified GICs made before and after charge neutral sodium fluoride to 2% for 4 minutes. and protecting the surface of the IVC Maxxion R with a dental adhesive, a cavity varnish and a colorless nail polish. With an array of stainless steel with 6mm x 2mm, it was made five specimens of each material, which were immersed in 5 mL of deionized water, changed every 24 hours. Readings were taken in a calibrated potentiometer coupled to an electrode sensitive to fluoride ions on days 1, 2, 9 and 17 in the 1st and 2nd stages, and the samples were buffered with TISAB III solution. In Step 2, the samples were submitted to recharge and then washed, dried and again immersed in 5 mL of deionized water. In Step 3 was done to protect the surface of GICs and readings made in 5min., 24h, 48h and 72h. The data were subjected to statistical tests post hoc Tukey et Student (p <0.05). It was concluded that the GICs were more effective in anhydrous fluoride ion release compared to composite resin modified GICs and Maxxion R had a homogeneous behavior and statistically significant in two steps. The GICs have the ability to recharge, especially anhydrous. All protective materials tested were effective, and nail incolor enamel showed the best behavior.