Effects of fluoride mouthrinse and naturally fluoridated water on fluoride uptake by deciduous enamel.

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The effects of fluoride mouthrinse (F: 500ppm, 5 times/week) and naturally fluoridated water (fluoride concentrations in drinking water: 0.3-3.2ppm) on fluoride uptake by deciduous enamel were investigated.<BR>Fluoride mouthrinse increased the fluoride concentration at 1μm depth in enamel from 4, 300ppm to 7, 300ppm when the rinsing period was increased from 1 to 4 years. A statistically significant increase of the fluoride concentration, however, was not found at 5μm from the enamel surface. Therefor, fluoride uptake by mouthrinse was mostly restricted to the outermost enamel layers.<BR>The fluoride concentrations in the deciduous enaml surface from a naturally fluoridated area are significantly higher than those in the enamel from a non-fluoridated area or enaml treated with fluoride mouthrinse. Extremely higher fluoride levels, approximately 10, 000ppm, were frequently found at 1μm depth in the surface enamel from high fluoride areas (over 1.0ppm). However, the enamel fluoride concentrations at 5μm depth from an area with 0.3ppm fluoride in the drinking water were not statistically significant compared to the control. High fluoride penetration found in the deeper layers of enamel in this study could due to both preeruptive and posteruptive acquisition of fluoride.
有限責任中間法人日本口腔衛生学会の論文