The penetration of exogenous tracers through the enameloid organ of developing teleost fish teeth.

Tissue & Cell
K ProstakZ Skobe

Abstract

In order to determine whether exogenous materials permeate to the forming tooth enameloid matrix, teleost species were injected intramuscularly with horseradish peroxidase (HRP) or myoglobin, or; intracardially with lanthanum nitrate or HRP, then killed a predetermined intervals post-injection. Tooth bearing bones were processed for transmission electron microscopy. At the enameloid matrix formation stage, capillaries associated with the enameloid organ were few in number and rarely fenestrated. Both organic tracers reached the matrix at cervical but not coronal, regions of the teeth in all species examined. Lanthanum was rarely observed extravascularly and never extended to the enameloid matrix at the secretion stage. At the enameloid mineralization stage, fenestrated capillaries were closely associated with the outer dental epithelial cells (ODE). All tracers were observed in the plasma membrane invaginations of the ODE. Only intracardially injected HRP compromised the apical intercellular junctions of the inner dental epithelial cells (IDE) to reach the mineralizing enameloid Lanthanum did not extend past the ODE-IDE cell junctions. It is concluded that the close association of mineralization stage fenestrated capillaries wi...Continue Reading

References

Jan 1, 1978·Journal of Dental Research·A Wennberg, J W Bawden
Mar 1, 1979·Journal of Dental Research·R M Frank
Aug 1, 1974·The Anatomical Record·H Warshawsky, C E Smith
Apr 1, 1967·The Anatomical Record·E J Reith, V F Cotty
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Mar 1, 1970·The Journal of Nihon University School of Dentistry·S IsokawaM Morimoto
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Mar 1, 1959·Oral Surgery, Oral Medicine, and Oral Pathology·P A TOLLER
May 1, 1962·Archives of Oral Biology·E J REITH, V F COTTY

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