The principles and practice of dental surgery / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: The principles and practice of dental surgery / by Chapin A. Harris. Source: Wellcome Collection.

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    of the formation of the enamel to he incorrect. It is at first, as represented by Raschkow and Goodsir, disconnected from the dental germ, surrounded by fluid, bearing a striking re- semblance to the liquor amnii, hut is gradually transformed into a membrane, and as dentinification commences in the pulp, attaches itself to it, and adheres with considerable tenacity. It was no doubt the discovery of this that led Delabarre to suppose the enamel an integral part of the tooth and proceed- ing from the dental embryo, for he speaks of the formation of this outer coating of the teeth as being produced by an immense number of small exhalent vessels which formed a sort of imper- ceptible velvet. Into these he believed the phosphate of lime was deposited, and in such a way as not to destroy their organic sensibility. ■ r v. a Raschkow says, “The dental germ, in advancing further and further into the dental follicle, makes first only a slight impres- sion on the globular mass of the enamel organ, but this impress is rendered gradually deeper as the growth of the germ pro- ceeds. When the germ is penetrated further into the hollow thus made, it appears narrower towards the base, and thicker under the apex, and is enclosed around on every side by the parenchyma of the enamel-organ, which thus assumes the ap- pearance of a hood, covering the dental germ when advanced in its development, and capable of being separated from it without difficulty, and without injury, either by the compressor, or in any other manner, by being placed under water. He also represents it as being disconnected from the dental cap- sule except at the coronal portion, where it seemed to be unite by some loose vessels; it is thus that he accounts for the nu- merous capillaries tvhich pervade the parenchyma of the organ; and from this, he assumes that while the dental germ has i s orioin from the extremity of the sac next the root, the ename- org°au originates from the opposite or coronal extremity, and that “arising at opposite points,” they “approach each other are adapted together, and both contribute to the production o the tooth.” ' , j a. 1 iv. After the enamel-organ has adapted itself to the dental pulp.