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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![The first upper molaris covers two-thirds of the first and part of the second molaris of the under jaw: The second upper molaris shuts upon the remainder of the second and part of the third; and the third molaris of the upper jaw, being smaller than that in the under jaw, shuts even upon it.* From this mechanism of the teeth their power in mas- tication is increased, and if one tooth be extracted, the antagonist tooth does not become useless, since it can in part act upon another. [When this is not the case, as often happens, it be- comes elongated, or is gradually forced from its socket by a deposition of bony matter at the bottom of the alveo- lus; and from this it would seem, that when a tooth has lost its antagonist, it becomes, in some degree, obnoxious to the system, and an effort is made by the economy to expel it from the jaw. In accordance with this indica- tion of nature, Dr. Koecker recommends the removal of such teeth. But as this tendency can in many cases, by constant attention to the cleanliness of the tooth, be mea- surably counteracted, the operation should be resorted to only in those cases where it is absolutely required.] The permanent incisores and cuspidati are formed behind the temporary incisores and cuspidati; the bicus- pides underneath the temporary molares, and they are contained in sockets of their own. The molares are, one after the other, formed in par- ticular parts of the jaws: In the upper jaw, that posterior part called the tubercle, is the place for the formation of the upper molares; and the molares of the under jaw are formed in that part situated beneath the coronoid process, one succeeding the other, as the jaws in their growth carry the teeth forwards. * Plate VIII. Fij?. 1.](https://iiif.wellcomecollection.org/image/b21120559_0040.jp2/full/800%2C/0/default.jpg)
