オーストラリア原住民の上顎大臼歯歯冠外形に関する研究　１　　大きさと変異について

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  • Study of the crown contours of maxillary molars in Australian Aboriginals. 1 Size and variability.
  • 1. Size and variability
  • 1. 大きさと変異について

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Distances from the central pit to the perimeter of the crown contour in the upper molars were measured from standardized occlusal photographs of dental casts representing the permanent dentitions of 210 male and 181 female Aboriginal subjects living at Yuendumu in the Northern Territory of Australia.<BR>In both males and females the first molar was the largest tooth in average crown size, and it showed the least variability among the upper molars. A gradual size reduction was noted in the distal part of the crown from the first to the third molar. There were no distinct size differences in the dimensions representing mesial or mesiobuccal regions of the crown between the three molars. Dimensions of crown contours were greater in the male subjects in all instances, sexual dimorphism being most marked for the second molar.

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