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1 Materials Division, Rensselaer Polytechnic Institute, Troy, New York 12181, USA
Ion-thinned longitudinal sections of a third molar were observed by bright- and darkfield electron microscopy. In bright field, the hydroxyapatite crystallites in enamel appeared as long rods, but, when observed in dark field, the crystallites were rectangular, with a mean length of 321 A.
Submitted on September 11, 1970
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