Fluoride and mineral redeposition in outermost layers of bovine enamel during surface softening.
Mineral and fluoride concentration changes in the outermost layers of bovine enamel (depth less than 1 micron) were measured after demineralization in unbuffered hydroxyethylcellulose gels of pH = 5.4 with an intrinsic fluoride concentration of about 0.02 ppm. A combination of two nuclear analytical techniques, Rutherford backscattering spectrometry (RBS) and proton-induced gamma ray emission spectrometry (PIGE) was applied to determine the Ca/P molar ratios and F depth profiles, respectively. When compared to deeper layers, a reduced loss of mineral content is observed for the depth range of about 0-0.1 micron corresponding well with a F concentration increase from about 500 to about 5,000 ppm in the same range. These findings are interpreted as a fluoride-induced partial remineralization of the superficial surface layer during an overall demineralization process.
Rentsch
H
H
Department of Conservative Dentistry, Karl-Marx-University of Leipzig, GDR.
Merte
K
K
Zschau
H E
HE
Plier
F
F
Otto
G
G
Vogt
J
J
D000818:Animals; D002118:Calcium / Q000032:analysis*; D002417:Cattle; D003731:Dental Caries / Q000378:metabolism*; D003743:Dental Enamel / Q000032:analysis*; D005459:Fluorides / Q000032:analysis*; D008859:Microscopy, Polarization; D010758:Phosphorus / Q000032:analysis*; D011522:Protons; D012542:Scattering, Radiation; D013051:Spectrometry, Gamma; D013052:Spectrometry, X-Ray Emission; D013057:Spectrum Analysis / Q000379:methods; D014089:Tooth Remineralization
D011522:Protons; D010758:Phosphorus; D005459:Fluorides; D002118:Calcium