PMID: 640859Feb 3, 1978Paper

Electron probe analysis of maturation ameloblasts of the rat incisor and calf molar

Histochemistry
A Boyde, E J Reith

Abstract

Rapidly frozen upper incisor teeth of rats and molar teeth of calves were freeze fractured, freeze dried and dry dissected in preparation for energy dispersive x-ray emission microanalysis in the scanning electron microscope. Successive zones of ameloblasts adjacent to maturing rat incisor enamel were examined, beginning with cells adjacent to the least mature enamel and progressing to cells over increasingly more mature enamel. Pronounced Kalpha1,2 x-ray peaks were obtained for P, S, Cl, K and Fe but not for Ca. Ca levels were also very low compared with P, S, Cl and K in calf molar maturation ameloblasts, whereas they were high in the distal poles of the secretory odontoblasts in the same specimens. The findings indicate that both intra- and extracellular Ca levels are extremely low in maturation ameloblasts. It is concluded that Ca is neither stored nor concentrated in large amounts by the maturation ameloblasts prior to its entry into the enamel. The suggestion is made that the maturation ameloblasts might regulate entry of calcium into enamel by serving as a selective barrier.

References

Aug 27, 1976·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·G N Beaty, E Stefani
Sep 1, 1988·Journal of Dental Research·J KirkhamK Josephsen
Apr 1, 1967·The Anatomical Record·E J Reith, V F Cotty
Mar 1, 1973·The American Journal of Physiology·W F NeumanK Lane
Jan 1, 1970·Journal of Ultrastructure Research·E J Reith
Apr 27, 1955·Annals of the New York Academy of Sciences·C P LEBLONDR C GREULICH
May 1, 1962·Archives of Oral Biology·E J REITH, V F COTTY

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Citations

Jun 1, 1990·Calcified Tissue International·T Kawamoto, M Shimizu
Sep 1, 1992·The Anatomical Record·D N SternW J Landis
Feb 1, 1997·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·T Kawamoto, M Shimizu
Mar 1, 1979·The Anatomical Record·D R EisenmannA Neiman
Dec 1, 1987·Advances in Dental Research·T Kawamoto, M Shimizu

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