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Heritability of permanent tooth size

G C Townsend, T Brown

    American Journal of Physical Anthropology
    |November 1, 1978
    PubMed
    Summary

    Genetic factors significantly influence permanent tooth size, accounting for approximately 64% of variability in Australian Aboriginals. However, environmental factors also play a crucial role in tooth size determination.

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    Area of Science:

    • Anthropology
    • Human Genetics
    • Odontology

    Background:

    • Tooth size variability is influenced by both genetic and environmental factors.
    • Understanding these influences is crucial for anthropological and dental research.

    Purpose of the Study:

    • To quantify the genetic and environmental contributions to permanent tooth size variation.
    • To estimate heritability of tooth size in Australian Aboriginals.

    Main Methods:

    • Analysis of dental casts from Australian Aboriginals.
    • Partitioning phenotypic variability into genetic and environmental components using sibling data.
    • Regression analysis of parent-offspring data for heritability estimates.

    Main Results:

    • Approximately 64% of permanent tooth size variability is attributed to genetic factors.
    • Common environmental factors account for about 6% of the variability.
    • A significant genetic component for tooth size was confirmed.

    Conclusions:

    • Permanent tooth size is substantially heritable.
    • Non-genetic influences are also important determinants of tooth size.
    • Findings highlight the interplay of genetics and environment in dental morphology.

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