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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![and the permanent teeth are contained in sockets of their own. This may be very well observed in the head of a child of about four years of age; at this time the jaws have become deeper, in consequence of the complete for- mation of the temporary teeth and their alveolar proces- ses, and the permanent set may be presented to view, upon removing the external plate of the jaws.* About this age the ossification of the incisores, cuspi- dati, first bicuspides, and first molares, is much advanced, some progress has been made in the formation of the second molares, and soon after, the ossification of the second bicuspides commences. At about six years of age those teeth designed to suc- ceed the temporary ones, and the first and second molares, are in considerable forwardness, and if none of the tem- porary teeth have yet heen removed, there are at this time in the head, forty-eight teeth, twenty in situ, and within the jaws beneath the gums, in the progress of for- mation, twenty-eight.f In the eighth or ninth year the formation of the third molares, or dentes sapientiae begins, by this time some of the front teeth have been shed, and all the others are much advanced in growth.J [The rudiments of the dentes sapientiae have been dis- covered at birth, but at this period they exist only as mucus papillae.] The permanent incisores and cuspidati, during their formation, are all situated on the inner side of the tempo- rary teeth, consequently they are contained within the segment of a circle, smaller than that which holds the temporary teeth; they are also much larger, and therefore very much crowded and forced into irregular order. The lateral incisores are placed sometimes crossways, and ♦Plate III. tPlate IV. \Plate V.](https://iiif.wellcomecollection.org/image/b21120559_0042.jp2/full/800%2C/0/default.jpg)
