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  • Title: High resolution electron microscopic observation of hydroxyapatite in tooth crystals.
    Author: Shibahara H, Tohda H, Yanagizawa T.
    Journal: J Electron Microsc (Tokyo); 1994 Apr; 43(2):89-94. PubMed ID: 8077875.
    Abstract:
    Structure images taken with a high resolution electron microscope with a resolution of 0.18 nm revealed that the atomic arrangement in tooth-enamel hydroxyapatite (HA) corresponds with the calculated image using crystallographic data from mineral HA (Ca10(PO4)6(OH)2). Direct information on the two types of Ca and the OH- groups in the HA crystals was obtained from the observed image through [001] projection. The established correspondence between the observed image contrast and the arrangements of the columnar Ca, the screw-axis Ca, and the OH- groups suggests that HREM observations are useful to identify defects in HA crystals.
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