A system of dental surgery / by John Tomes...with two hundred and seven illustrations.

  • John Tomes
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: A system of dental surgery / by John Tomes...with two hundred and seven illustrations. Source: Wellcome Collection.

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    TF.E'rnixu. the completion of its development—namely, the smooth and polished surface which succeeds to the dull, opaque, and almost chalk-like character maintained so long as the tissue is incom- plete. The lateral incisors present similar appearances, except- ing that the neck is less pronounced than in the central teeth. The canines at present are placed deep in the sockets, the crowns being incomplete, contrasting strongly with the teeth immediately behind them. These, the first temporary molars, have the crowns nearly completed, the masticatory sur- faces of which are on a level with the alveolar margin. The latter parts have already been slightly reduced by absorption, and the outer apertures of the sockets have been thereby en larged. The second temporary and the first permanent molars, although considerably advanced as compared with those of the six-months' subject, are still considerably below the level of the alveolar margins, the outer of which is turned very much inwards, and hence the openings of the sockets arc cou- tracted, an arrangement calculated to afford protection to the developing teeth. Passing from the nine to the ttedce-months' subject, further changes in the dental apparatus will be observed, indicating that during the intervening three months the process of teeth- ing, as t he term is commonly understood, has fairly set in, and at the latter age is in full activity. In the upper jaw the two halves of the boue are becoming united; and although they may be separated after maceration, yet it requires some force to part them, a condition very different to that which obtains at an earlier period, when they readily fall apart. It was stated that the anterior wall of the alveoli of the central incisors in the nine-months' jaw, had been diminished by ah-
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