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  • Title: Structural studies on calcium fluoride formation and uptake of fluoride in surface enamel in vitro.
    Author: Larsen MJ, Fejerskov O.
    Journal: Scand J Dent Res; 1978 Sep; 86(5):337-45. PubMed ID: 31673.
    Abstract:
    The structural changes in human enamel during exposure to an acetate buffer, pH 4, containing 150 parts/10(6) fluoride have been studied using scanning electron microscopy and polarized light microscopy. After exposure for 2 h the enamel surface was covered by a fine-granular layer of calcium fluoride. The underlying enamel was highly eroded with an increased pore volume in the outer layer. Following an equilibration period of 3 months the uptake of fluoride in the apatite lattice had resulted in a highly mineralized, 100-micrometer-thick surface layer rich in fluoride covering a subsurface porous zone with an unchanged fluoride content. The deeply located, caries-like porous zone may have provided calcium and phosphate for saturation of the liquid.
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