A system of dental surgery / by Sir John Tomes.

  • John Tomes
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: A system of dental surgery / by Sir John Tomes. Source: Wellcome Collection.

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    these teeth have escaped from the sockets to the extent of half their length, the whole of the enamel on the anterior surfixce being visible. They are placed against the anterior wall, and are separated by a considerable interval from the posterior wall of the alveoli. The latter process at this age descends below the level of the anterior wall of the sockets, at the same time that an increase of thickness of the bone at this i)art is allowed by the forward movement of the incisor teeth. The crj^jts of the permanent teeth become enlarged, occupying the space w'hich has been gained. The apertures leading to the permanent incisors are now situated near the alveolar naargin, but at present open upon the inclined surface which forms the posterior wall of the enlarged sockets of the temporarjf teeth. The lateral incisors have escaped from their alveoli to the extent of two-thirds of their crowns. The canine pro- minences on the anterior surface of the jaw, which during the earlier months of life form so strong a feature, are now becoming lost; not, however, by their own subsidence, but by the advancing forwards of the alveoli of the neighbouring teeth. The first temporary molars at this age have passed through the apertures of the sockets, and the emargination of the external plate is gradually becoming lost, the pi'ocess of development having succeeded to that of absorption of the socket. If the maxillfE of an eighteen-months' child are compared with those of twelve or thirteen months, the relations of growth between the teeth and sockets may be seen. The emargination of the sockets of the central incisors, and con- sequent enlargement of the alveolar apertures necessary for the evolution of the crowns of these teeth, having been accomplished, and the crowns having passed througli, absorption is suspended, and the several alveoli becoming contracted, apply themselves to the teeth, development at the margins keeping pace with the growth of the roots of the teeth. The socket of an incisor, so long 'is the crown is below tlie alveolar margin, is larger at its base
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