كليدواژه :
دندانپزشكي , جذب فلورايد , ژل فلورايد , دندان دايمي , Permanent tooth , Fluoride uptake , Fluoride gel
چكيده لاتين :
Background and aim: Periodic and regular fluoride therapy significantly reduces caries prevalene in children and adolescents. Nowadays, a lot of different kinds of fluoride gels are used in the dental office and determination of fluoride ion uptake rate by enamel is a good way to evaluate the efficacy of these products. The aim of this experimental study was to compare fluoride ion uptake rate by the enamel of permanent teeth after the application of "Cina" gel and an ADA standard gel (Sltan).
Methods & Materials: Forty intact permanent premolars Nere divided into buccal and lingual halves with diamond disks under to water. Buccal halves were considered as cases (Fluoride-applied) and lingual ones as controts. A half-circle (6mm diameter) adhesive tape was applied to the enamel surface and other parts were then covered with acid-resistant polish. After adhesive tapes removal twenty buccal halves were exposed to "Cina and the others to "Sultan" gel. After four minutes, the specimens were susppended in 5ml synthetic saliva for 24hours at 37°C. Afterwards, each specimen was etched for 30 seconds in 1cc of 0.5M Acid Percholoric in two sequential stages and in each stage, the window was washed with 0.2M KOH solution. Measurements of fluoride and calcium concentrations were carried out using Potentiometer and Atomic absorption spectrophotometry, respectively. Data were subjected to Paired t-test, Mann-Whitney U test and wilcoxon Signed Rank test.
Results: Results showed that mean fluoride concentration of cases was significantly higher than controls in "Sultan" group (1824.4 ppm vs. 1449.6 ppm, P=0.000 in the first layer of biopsy and 2032.5 ppm VS. 1310.5 ppm, P=0.000 in the second layer). In Cina gel group, there were no significant differences in fluoride concentration of two biopsy layers in cases and controls (1521.7 ppm vs. 1450.3 ppm, P=0.316 in the first layer and 1385.8 ppm vs. 1387.6 ppm, P=0.951 in the second).
In both Layers, the mean fluoride uptake rates were higher in "Sultan" than "Cina" group (392.8 ppm vs. 71.4 ppm, P=0.000 in the first layer and 722.1 ppm vs. - 1.7 ppm, P=0.000 in the second layer).
Conclusion: Considering the insufficient uptake rate of fluoride ion in "Cina" gel, it is suggested that lhisgel has no efficiency in Increasing enamel fluoride content.
