Influence of bioadhesive polymers on the protective effect of fluoride against erosion

Made available in DSpace on 2018-12-11T17:30:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01 Objective This study investigated if the incorporation of the bioadhesive polymers Carbopol 980, Carboxymethyl cellulose (CMC), and Aristoflex AVC in a fluoridated solution (NaF–900 ppm) would increase the solution's protective effect against enamel erosion. Methods Enamel specimens were submitted to a 5-day de-remineralization cycling model, consisting of 2 min immersions in 0.3% citric acid (6x/day), 1 min treatments with the polymers (associated or not with fluoride), and 60 min storage in artificial saliva. Ultrapure water was used as the negative control and a 900 ppm fluoride solution as positive control. The initial Knoop microhardness (KHN1) was used to randomize the samples into groups. Another two microhardness assessments were performed after the first (KHN2) and second (KHN3) acid immersions, to determine initial erosion in the first day. The formula: %KHNalt = [(KHN3-KHN2)/KHN2]*100 was used to define the protective effect of the treatments. After the 5-day cycling, surface loss (SL, in μm) was evaluated with profilometry. Data were analyzed with 2-way ANOVA and Tukey's tests (p