An atlas of skiagrams : illustrating the development of the teeth with explanatory text / by Johnson Symington and J. C. Rankin.

  • Johnson Symington
Date:
1908
Catalogue details

Licence: In copyright

Credit: An atlas of skiagrams : illustrating the development of the teeth with explanatory text / by Johnson Symington and J. C. Rankin. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    Fig, I. Left Side of Girl thirteen years old and 4 feet 6 inches high. A median section of ihi.s girl is represented in Plate I. of ni)- work ou The Topo- graphical Anatomy of the Child, published in 1887. The arteries were injected with a paint containino- red lead, and some of the vessels are shown in the skiagram. The upper dental arch is irregular, the first bicuspid bulges outwards, and the permanent canine is displaced towards the palate, so that the canine and bicuspids overlap one another in the skiagram. This overcrowding was mainly due to the retention of the temporarv canine, but also to a piece of the second temporary molar remaining in front of the first permanent molar. All the upper permanent teeth are erupted except the third molar. In the mandible the first and second temporary molars are present, l)ut it is evident from the skiagram that the whole of the first temporary molar is absorbed with the excep- tion of the upper part of its crown. The labial cusp of the first bicuspid and the anterior cusps of the second permanent molar are erupted. The permanent canine, both bicuspids, and the second permanent molar are not yet fully formed, as is shown by the size of the opening at the end of the roots. The third lower molar i)oints almost directly forwards, and has not yet developed any roots. Fig. 2.—Left Side of Girl sixteen years old and 5 feet high. In this girl all the teeth are erupted, and are fully developed except the third molar-s. In the mandible both the first and second molars are carious, and in the first molar the disease has apparently stopped somewhat abruptly near the upper part of the roots. This shows how readily in attempting to extract this tooth the carious portion might break away and leave the roots in their alveoli. The third molars exhiint their characteristic position before eruption. The roots of the upper wisdom tooth are commencing to form, and the crypt for the tooth has caused a distinct elevation in the posterior part of the maxillary antrum. On a comparison of this skiagram with that of the girl thirteen years old it will be seen that considerable progress has been made in the growth of the mandible in the girl sixteen years old, by which space has been provided for the eruption of the wisdom tooth in front of the level of the ascending ramus. Fig. E was made from tlie lateral aspect uf tlie right maxilla and neighbouring bones of tliis girl, the accessory sinuses having been I)reviously e.vposed in the manner already described. As on the left side, all the teeth are erupted except the wisdom. The maxillary antrum measured 3-.) cm. .sagittally, 3'0 cm. vertically, and 2-5 cm. in a lateral direction. As compared with the boy ten years old (see Fig. D), the antrum has increased about 1 cm. in the vertical antl trans- verse directions, while its antero-pos- terior extent is the same. The distinct elevation in tlie floor is here caused by the wisdom tooth, and not, as in the boy ten years old, by the unerujited second molar. The outline of the floor of the antrum on the left side is shown in the skiagram, where it can be followed forwards as far as the first bicus])id before turning njiwards to join the anterior wall.