The diseases of the human teeth : their natural history and structure : with the mode of applying artificial teeth, etc., etc. / by Joseph Fox and Chapin A. Harris ; with two hundred and fifty illustrations.
- Joseph Fox
- Date:
- 1855
Licence: Public Domain Mark
Credit: The diseases of the human teeth : their natural history and structure : with the mode of applying artificial teeth, etc., etc. / by Joseph Fox and Chapin A. Harris ; with two hundred and fifty illustrations. Source: Wellcome Collection.
Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)
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![maxillary tuberosity. In the formation of the roots of the temporary incisores, three cotemporaneous actions/' says Mr. Goodsir, are employed, viz: the lengthening of the pulp; the deposition of tooth substance upon it; and the adhesion to the latter of that portion of the inner sac which is opposite to it. The sacs of the permanent teeth continue to recede during the advance of the tem- porary teeth and their sockets to their perfect state, and to insinuate themselves between the sacs of the former until they are only connected by their proximal extremities through the alveolo-dental canals or itinera dentiwm, as they are termed by M. Delabarre. From the foregoing brief summary of the result of the researches of Mr. Goodsir, as given at length by himself, it will be perceived, that the germs of the permanent teeth, although like those of the temporary, originating from mucus membrane, are nevertheless of distinct origin, and have no connection with them. Their origin and progress, however, as well as those of the temporary, will be more readily and better understood by an exami- nation of plate VII. copied from the diagram given by the author of the paper in question.] A tooth is composed of two substances, one of which, called the enamel, is spread over that part which is not covered by the gums. The other substance is bone; it consists of the fang and all the body of the tooth situated within the enamel. [To these may be added the pulp and crusta petrosa, or cementum.] [The pulp is soft, gelatinous, and has a semi-transpa- rent appearance; its surface is covered by an extremely thin and vascular membrane, designated by Raschkow, the praeformative membrane. This membrane constitutes the bond of union between the enamel and the bone of the tooth.]](https://iiif.wellcomecollection.org/image/b21120559_0050.jp2/full/800%2C/0/default.jpg)
