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  • Title: Relationship between nanohardness and mineral content of artificial carious enamel lesions.
    Author: Buchalla W, Imfeld T, Attin T, Swain MV, Schmidlin PR.
    Journal: Caries Res; 2008; 42(3):157-63. PubMed ID: 18446023.
    Abstract:
    The aim of this study was to compare cross-sectional nanohardness, measured using an ultra-microindentation system, with mineral content, from transversal microradiography, of artificial enamel caries lesions. Sections (85 +/- 10 microm) from 16 bovine enamel samples with artificial caries were prepared. The mineral content and cross-sectional nanohardness at known depths from the surface were compared. Both methods showed lesion profiles with a surface layer. The determination of nanohardness seems limited to lesions with a mineral content >45 vol%. There was a moderate linear relationship between mineral content and the square root of nanohardness (R2 = 0.81). It was concluded that the conversion of cross-sectional hardness into mineral content remains questionable and cannot be recommended.
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