An atlas of skiagrams : illustrating the development of the teeth with explanatory text / by Johnson Symington and J. C. Rankin.
- Symington, Johnson, 1851-1924.
- Date:
- 1908
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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![special rapid plates were used, and the exposure was generally rather less than half a iiiimite. Soft tubes gave the best results when the negatives were viewed as transparencies, or used in the preparation of half-tone blocks, l)ut in some cases better prints were olitained from plates acted upon by rays from medium tubes. All the figures in this Atlas are of the same size as the original negatives, and are slight enlargements of the actual specimens. They show the teeth and jaws as seen from the lateral aspect and somewhat from the front. The negatives were not touched up in any way, and were given to the process-block makers with instructions to copy thom as accurately as possible. It is difficult to avoid some slight loss of detail by anv kiiuun method of reproduction, but every effort has been made to reduce such losses to a minimum, and we desire to thank Messrs. \V. & G. Baird of this city for the great care and skill with which they executed our orders. In the explanation printed opposite each plate no attempt has been made to give a minute and exhaustive description of the skiagrams. The reader is assumed to be familiar with the general anatomy of the teeth and their development as described in an\- ordinary text-book of anatomv. Provided with this knowledge, the student will liavc little difficulty in interpreting the skiagrams. Until the teeth of the first dentition begin to fall out and be replaced by their permanent successors, there is little difference between the teeth on the two sides; indeed, in nearly every case we have found the resemblance to be very marked. For this reason it was not consiclered necessary to figure both sides in children under seven years. The period during which the temporary teeth are being replaced by their permanent successors is one in which the position and condition of both sets are of great practical interest, and a bilateral symmetry the exception rather than the rule. We have, therefore, shown both right and left halves in the four children, one aged seven, another nine, and two ten years. As the series of skiagrams were taken from eighteen children, whose ages ranged from birth to sixteen years, and from one adult, a practically complete history of the calcifica- tion of each tooth, whether temporary or permanent, will be found recorded in ilie plates of this Atlas. The figures A to E, printed with the text, are drawings of specimens dissected to illustrate the relations of the maxillary sinus to the teeth at various periods of life. The specimens were prepared by removing the greater part of the bony wall of the sinus, narrow bars of bone being, however, left in situ for the su]iport of the lining membrane. Professor G. Killiaii has shown that by hardening the head in forniol the muc()-])eriosteal](https://iiif.wellcomecollection.org/image/b21458868_0012.jp2/full/800%2C/0/default.jpg)
