<研究報告>四分相関法により計量化された非計測的歯冠形質の左右非対称性の程度(英文)

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The directional and fluctuating asymmetries of fourteen nonmetric tooth crown characters including shoveling, CARABELLI'S tubercle, etc. were examined in a Japanese sample. No significant directional asymmetry was found for most of the characters examined. The fluctuating asymmetries were confirmed to be significant for about one third of the characters examined. Tetrachoric correlation coefficients between right and left sides suggested tendencies for relative fluctuating asymmetry in several nonmetric tooth crown characters to be greater in females than in males and to be smaller in the mesial tooth than in the distal one within a morphological tooth class. Furthermore, the relative fluctuating asymmetries of most nonmetric tooth crown characters of cheek teeth were greater than those of the mesiodistal and/or buccolingual crown diameters of the same teeth. After all, it was suggested that the degrees of fluctuating asymmetry in crown components or overall crown size were associated with the adaptive significance of the characters, and that the developmental pathways from most of the crown components to the composite crown which were more intensively influenced by genetic factors than by environmental ones existed during the calcification period.
国立科学博物館の論文