現代日本人の歯髄腔形態の分析, とくにTaurodontismについて
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概要
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This article concerns with an anthropological investigation of pulp cavity morphology of the molar teeth in the modern Japanese. The author proposed a five-class classification method of the pulp cavity morphology which was modified from that presented by Shaw (Figure 2). The results obtained are as follows: 1) No hypertaurodonty was observed in lower molars of the Japanese. 2) The basic form of the pulp cavity of M1 appears to be a cynodonty seen from the evolutionary point of view. 3) There is an apparent trend in M2 in which the pulp cavity changes from hypotauroclont.y to cynodonty with increase of ages. However, since this change is relatively slight, the shape of the pulp cavity seems to be relatively stable in this tooth. 4) On the contrary to M1, hypotaurodonty appears to be the basic form in M3. 5) Generally in the lower molars, the frequency of hypercynodont is higher and that of mesotaurodont is lower in the higher age groups. 6) No between-sex difference of this trait is observed in M1. On the other hand, in M2 and M3, a trend towards taurodont is a little more apparent in females than in males when all the age groups are combined. 7) The relative size of the pulp cavity shows the relationship of M1 ≦ M2 M3. 8) In case of personal identification from the pulp cavity morphology, M1 and M2 must be observed in combination, and detailed observations of hypertaurodont should be clone. 9) The internal morphology of the human teeth, or that of taurodont in particular, is a character of quite importance in relation to the external morphology of the teeth. This is especially true when the teeth are investigated from the evolutionary point of view. At the sametime, the author recommends the method of classification proposed in this article to evolutionary studies of the human teeth
- 1980-04-01
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