<研究報告>計測的・非計測的歯冠形質における非対称の共変動(英文)

概要

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The inter-character covariation of right-left differences in eighteen mesiodistal and buccolingual tooth crown diameters and ten nonmetric tooth crown characters was investigated through the principal component analysis of the tetrachoric correlation coefficients between them. In both males and females, it was found that the right-left differences of the lateral incisor shoveling, the CARABELLI'S tubercle of the first molar, the buccolingual crown diameters of maxillary cheek teeth, ect. had relatively high correlations with a certain principal component. This suggests a tendency for several dental asymmetries to co-vary to some extent. Such a tendency may be explained, in part, by those common environmental factors which can simultaneously influence the symmetry/asymmetry condition of many dental characters in the same way, e.g., the skewed distribution of nerve fibers or blood vessels within the jaws at early developmental stages, the asymmetrical microstructure of blood vessels, etc.
国立科学博物館の論文