Effect of high-fluoride dentifrice and bracket bonding composite material on enamel demineralization in situ
Abstract
Objective
This in situ study evaluated the effect of high-fluoride dentifrice (5000 μg F−/g) and fluoride-containing bonding composite resin on enamel demineralization adjacent to orthodontic brackets.
Methods
Ten
volunteers wore palatal appliances containing bovine enamel blocks with
metallic brackets bonded with fluoride-free or fluoride-containing
composite resin. During three phases of 14 days each, three dentifrices
with different fluoride concentrations (0, 1100, and 5000 μg F−/g)
were tested. The cariogenic challenge consisted of 20% sucrose solution
dripped 8x/day onto the dental blocks. At the end of each phase,
biofilm formed was collected for fluoride analysis. Cross section
hardness was performed in enamel blocks, and the lesion area was
calculated. Data were analyzed by two-way ANOVA followed by Tukey post
hoc test (α = 5%).
Results
The
only signicant factor for all the variables under study was the
dentifrice. Smaller lesion area and higher fluoride concentration on
biofilm were found in 5000 μg F−/g group, irrespective of bonding composite resin (p < 0.001). Neither bracket-bonding composite resin nor the interaction between the factors was statistically significant (p > 0.05) for all the variables.
Conclusion
High-fluoride
dentifrice is effective in reducing demineralization on enamel adjacent
to orthodontic brackets, while the fluoride-containing bonding
composite resin does not influence it.
Clinical Significance
Since
high-fluoride dentifrice was able to reduce demineralization adjacent
to brackets, it can be an option to caries management in orthodontics
patients.
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