In vitro effi ciency of fl uoride-containing compounds on remineralization of carious enamel lesions under cyclic pH conditions Efi ciencia in vitro de compuestos fl uorados en la remineralización de lesiones cariosas del esmalte bajo condiciones cíclicas de pH

Fluoride-containing products are mainly used due to their anti- cariogenic effect upon dental enamel. Objective: The aim of the present study was to determine the effi ciency of three fl uorinated compounds when used on demineralized enamel. Method: A de- mineralized surface was obtained by means of exposing the enamel of 120 permanent third molars to a demineralizing solution for 96 hours. Molars were randomly divided into four groups in order to receive topical treatment with the following fl uorinated compounds: 1) silver ammonium fluoride, 2) difluorsilane , 3) acidulated phosphate fluoride and 4) a control group. All samples were immersed in a cyclic pH system (pH 4.4 to 7.0) and retrieved after 5, 10 and 15 days in order to be observed. Samples were examined under polarized light and Tholuet solution in a photomicroscope (Zeiss, Germany) in order to determine remineralization according to exhibited birefringence. Results: After 5 and 10 days, the group treated with silver ammonium fl uoride showed signifi cant difference with respect to other groups. Nevertheless, acidulated phosphate fluoride 10-day results remained equally unaltered at 15 days. Conclusions: The group treated with silver ammonium fluoride presented more signifi cant changes than groups treated with silver ammonium fl uoride, difl uorsilane as well as the control group. RESUMEN

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