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Journal of Electron Microscopy 43(6): 398-401 (1994)
© 1994 Oxford University Press

High Resolution Electron Microscopy of a Small Crack at the Superficial Layer of Enamel

Yoshihiko Hayashi

Department of Conservative Dentistry, Faculty of Dentistry, Kyushu University 61 Maidashi 3-1-1, Higashi-ku, Fukuoka, 812 Japan

A small enamel crack was investigated using a high resolution electron microscope. The inside of the crack was filled with aggregates of irregularly oriented plate-like crystals. Amorphous mineral deposits were observed among these aggregates at a low magnification. Selected area electron diffractions indicated that the plate-like crystals consisted of hydroxyapatite (OH-AP), and that the amorphous mineral deposits were a mixture of OH-AP and whitlockite. These findings indicate that this crack may have been formed by occlusal and/or masticatory stress, and that a natural occlusion might occur through mineral deposition at the small crack such as in this case.

Keywords     enamel crack, lattice fringes, crystal contact, hydroxyapatite, whitlockite

Received     16 August 1994, accepted 7 November 1994


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