Abstract
ObjectiveThis in vitro study aims to evaluate the effect of low fluoride (F) gel associate sodium trimetaphosphate (TMP) on erosion with or without abrasion. DesignEnamel blocks (4mm×4mm) selected through surface hardness (SH) is divided into five groups (n=12): gel without F and TMP (placebo), gel containing 4500ppm F (4500), gel containing 4500ppm F plus TMP5% (4500 TMP5%), gel containing 9000ppm F (9000), and gel containing 12,300ppm F (acid gel). Those groups were additionally subdivided into conditions of erosion (Ero) and of erosion plus abrasion (Ero/Abra). The blocks have undergone a single application of gel on the first day of the study. The erosion challenge was produced by Sprite Zero® for five minutes four times a day and abrasion was carried out by machine brushing for 15s. After the challenges, the surface hardness (%SH), wear and cross-sectional hardness (ΔKHN) were analyzed. The data were analyzed using a 2-way ANOVA test followed by a Student-Newman–Keuls (p<0.05). ResultsLower values of %SH, wear and ΔKHN were observed for erosion challenge (p<0.001). The %SH was lower in groups treated with fluoride gels, differing in the placebo (p<0.05). With addition of TMP to the gel 4500, enamel wear was lower when compared with another groups (p<0.05). ConclusionIn vitro conditions, the 4500 5%TMP gel showed greatest effect against erosion and erosion/abrasion.
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