Effect of fluoride varnish supplemented with sodium trimetaphosphate on enamel erosion and abrasion: An in situ/ex vivo study
Available online 3 October 2013
Abstract
Objective
To
evaluate the effect of fluoride (F) varnishes supplemented or not with
sodium trimetaphosphate (TMP) on enamel erosive wear followed or not by
abrasion in situ. Methods: Ten volunteers were selected and
randomly divided into four groups, according to the varnishes tested:
placebo (no F or TMP), 5% NaF (positive control), 2.5% NaF and 2.5%
NaF/5% TMP. Enamel blocks (n = 4) were mounted in
palatal devices and received an application of each test varnish,
following a double-blind, crossover protocol. After 6 hours, varnishes
were completely removed and the blocks were subjected to erosive
challenges by ex vivo immersion in citric acid (5 min, 4x/dia, 5
days). Following, half of the blocks were subjected to abrasion by
brushing with a placebo dentifrice slurry for 15 seconds. Enamel wear
(μm), surface hardness (SHf) and cross-sectional
hardness (ΔKHN) were assessed after each experimental period. Results
were analyzed by ANOVA, Student-Newman-Keuls's test and Pearson
correlation coefficient (p < 0.05).
Results
The
fluoride varnish supplemented with TMP promoted significantly lower
wear and ΔKHN when compared to the other groups after erosive
challenges, followed or not by abrasion (p < 0.05). As for (SHf)
the fluoride varnish supplemented with TMP promoted similar results to
the 5% NaF product, being significantly higher than the remaining groups
after erosive and erosive + abrasive challenges (p < 0.05).
Conclusion
TMP significantly enhanced the effects of F on enamel wear after erosive challenges, followed or not by abrasion.
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