Rate of congenital missing of the third molar in Japanese people in Edo period

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  • Kanazawa Eisaku
    Professor Emeritus, Nihon University School of Dentistry at Matsudo Kitahara Gakuin College of Dental Hygiene
  • Sakaue Kazuhiro
    Department of Anthropology, National Museum of Nature and Science, Tokyo

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Other Title
  • 江戸時代人の第三大臼歯の欠如率
  • 江戸時代人の第三大臼歯の欠如率 : 身分階級による違い
  • エド ジダイジン ノ ダイサン ダイキュウシ ノ ケツジョリツ : ミブン カイキュウ ニ ヨル チガイ
  • ―身分階級による違い―

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Abstract

<p>The rate of the congenital missing of third molars was examined in skulls excavated from archaeological sites in Edo era. The number of skulls was 196 which were derived from ceramic coffins (high-ranked warriors) and wooden coffins (townspeople). The rate was calculated as the number of missing third molars divided by the total number examined. The results were: 23.8% in wooden coffin males, 26.5% in wooden coffin females, 30.0% in ceramic coffin males, and 36.0% in ceramic coffin females. Rates of missing were relatively high in females than in males, but the sex-combined rates were: 24.8% in wooden coffins and 33.2% in ceramic coffins, respectively, which were significantly different at the 5% level (Fisher’s exact test). It was so far recognized by previous studies that skulls in wooden coffins had the relatively wide face and stout mandible, and that skulls in ceramic coffins had the relatively narrow face and gracile mandible. Considering this fact and the results obtained, it would be concluded that skulls in wooden coffins might have enough space for containing third molars in the maxilla and mandible, on the other hand, those in ceramic coffins might not have enough space for them.</p>

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