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  • Title: An analytical ultrastructural study of the iron-rich surface layer in rat-incisor enamel.
    Author: Heap PF, Berkovitz BK, Gillett MS, Thompson DW.
    Journal: Arch Oral Biol; 1983; 28(3):195-200. PubMed ID: 6574731.
    Abstract:
    Electron-dense particles, approximately 4 nm (40 A) in diameter were present. Evidence is offered that these particles represent iron probably in the form of amorphous hydrous ferric hydroxide. From X-ray probe analytical data, it is suggested that this iron component is accommodated through the process of adsorption rather than by direct substitution of calcium and phosphorus. The iron-rich surface layer was more resistant to acid etching than subsurface enamel. Reported areas of reduced mineral density of enamel at the enamel-dentine junction appear to be preparation artifacts.
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