A manual of dental anatomy, human and comparative / by Charles S. Tomes ; edited by H.W. Marett Tims and A. Hopewell-Smith.

  • Tomes, Charles S. (Charles Sissmore), Sir, 1846-1928.
Date:
1914
Catalogue details

Licence: In copyright

Credit: A manual of dental anatomy, human and comparative / by Charles S. Tomes ; edited by H.W. Marett Tims and A. Hopewell-Smith. 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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    before backwards, and they are very usually curved slightly backwards. In the median line of each root there is usually a groove, by the deepening of which four roots may be produced ; or this may happen with one root only, so that a three-rooted tooth is the result. The first lower molar had five cusps in 82 per cent, of all skulls examined. The second molar does not greatly differ from the first, save that the roots are more often confluent, and the fifth cusp less marked, even if it exists at all. It is present in about 24 per cent, of skulls. Fig. 10.—Second lower molar of right side, the four cusps being indicated by figures. The tooth figured is not so square as it should be, its posterior cusps as well as its posterior root being smaller than the normal. The third mandibular molar is seldom so small as the corresponding upper tooth, and its crown is often large even when its roots are very stunted. It has five cusps, as a rule, and bears a more or less close resemblance to the molars which precede it. It is either two-rooted, or if the roots be confluent, a groove usually marks a tendency to a division into %two fangs. Fig. 11.—The third left mandibular molar. It is stated by Professor Owen (3) that, although the third molar is the smallest of the series, the difference is less marked in the Melanesian than in the Caucasian races, adding also that the triple implantation of the upper and the double im- plantation of the lower is constant in the former races. More extended observations have overthrown this statement as a