[In vivo study of variously concentrated fluoride gels in the surface enamel].

The efficacy of differently concentrated aminofluorides was determined under in vivo conditions. Enamel samples of human teeth were attached with a composite buccal surfaces of upper molars in 21 test persons and treated for 3 min with a 1.25% respectively, 0.4% aminofluoride gel. After 4 weeks in the oral cavity, during which no fluoride-containing dentifrices were used, the fluoride content of all enamel samples decreased. The results show, that the gel containing 0.4% fluoride was statistically less effective than the 1.25% gel. Intraoral factors seem to have more influence on the degree of demineralization than the fluoride content.