Résumé
Since compared to the fluoride gel, the fluoride varnish has received an increasing dentists' attention, due to some additional advantages including simple application especially in young children and less chair time, this study was done to compare the fluoride varnish and gel in terms of salivary concentration and longevity. This clinical trial, approved by Islamic Azad University Khorasgan University of Medical Sciences, was conducted with the participation of 10 randomly selected ten 12-14 year old volunteer boys. The salivary fluoride concentration was measured four times, before, after 30 minutes, seven and ten hours after fluoride therapy with gel and after a two-week interval with fluoride varnish, using fluoride ion selective electrode method. The data were statistically analyzed using Repeated Measure ANOVA, t and Paired-t tests. Thirty minutes and seven hours after fluoride therapy with varnish, salivary fluoride concentrations were significantly higher than that of the base. However, after 10 hours, it reached to the base level. On the other hand, in the gel group, the salivary fluoride concentration was significantly higher than that of the base only after 30 minutes of treatment and after seven and ten hours it reached to the base level again. Comparing the two groups, the fluoride concentration of saliva was significantly higher in varnish group than in gel group after 30 minutes and 7 hours of treatment. Salivary fluoride concentration after fluoride therapy with the varnish is significantly higher than fluoride therapy with the gel not only in terms of the quantity but also in terms of the longevity