Effect of application frequency of fluoride gels on the control of enamel erosion
Keywords:
Tooth erosion, Fluorides, Dental enamel permeabilityAbstract
This study aimed to assess the effect of the application regimen of neutral and acidulated fluoride gels on the control of the progression of erosive lesions, through permeability analysis. One hundred and forty bovine enamel slabs, which had been previously isolated, except for a 3-mm diameter window, were subjected to erosive challenges twice daily for 3 weeks. Erosion was simulated through the exposure of specimens to 20ml of orange juice (5 min), under agitation. Samples were kept in artificial saliva between erosive episodes. According to a randomized complete block design (n=20), specimens were treated with either neutral (NF) or acidulated (APF) fluoride gels, which were applied on a weekly or daily basis or after each erosive challenge. Control groups remained untreated. For permeability analysis, specimens were subjected to a histochemical coloring method using cooper sulfate and dithiooxamide solutions. Sections taken from the exposed area were digitized under an optical microscope and evaluated regarding the percentage of cooper ion penetration throughout the total enamel thickness. Friedman’s test and least significant difference test (a=0.05) revealed that the permeability of eroded enamel was lower when the APF gel was used, regardless of its application frequency. Enamel permeability following NF exposure did not differ from that observed in the untreated control group. It may be suggested that erosion lesions in enamel may be more efficiently controlled by acidulated fluoride gels, regardless of their use regimen.
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