Abstract
Fine structural examination of the vasodentine in the teeth of the N. Atlantic fish, the white hake, Urophycis tenuis (Gadidae) has shown the relationship of the included blood capillaries to the dentinal matrix. The endothelial cells of the capillaries are separated from the calcified dentine matrix by two uncalcified distinct zones. Immediately around the capillary is a zone made up principally of fine granular ground substance in which a few widely-dispersed randomly-arranged fibres are embedded. Around this first zone and sharply differentiated from it is a second zone consisting almost entirely of densely-packed, large collagen fibres arranged more or less circumferentially around the capillary. This zone terminates abruptly at the border with the general calcified vasodentine matrix. The endothelial cells of capillaries are not changed in fine structure when they are located in calcified vasodentine matrix. The vasodentine matrix does not contain dentinal tubules and the odontoblasts do not have odontoblast processes. The surface of the odontoblast facing the predentine has several short (2–3μ length 0.1μ dia.) microvilli projecting into the predentine. In most other features the vasodentine odontoblasts closely resemble the orthodentine odontoblasts.
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