On the Development of Dentin in Fish

Publisher Website
Google Scholar
Abstract
In Squalus acanthias the formation of the collagenous dentin fibers is effected by differentiation within the cytoplasm of the peripheral cells of the dental papilla. In the tip of the papilla, many heterogeneously arranged, coarse, but discrete argyrophiie fibers form without uniform outer or inner boundaries. Some penetrate the earlier deposited organic foundation of the mesodermal enamel, while others closely approximate the peripheral cell nuclei. The substance around the nuclei and between the fibers appears granular. The number of fibrils increases until a compact mass with a relatively regular boundary generally becomes established toward the papilla. Here, the peripheral cells appear as a syncytium with a granular cytoplasm. This pattern is maintained as the dentin layer widens. Basally beyond the limits of the mesodermal enamel cap, typical von Korff''s fibers are observed at the initiation of dentin formation. These fibers often divide and become reoriented to continue longitudinally in the membrana terminans. After establishment of a certain thickness, continuance of dentin development is similar to that which occurs at higher levels in the tooth.

This publication has 1 reference indexed in Scilit: