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Evolutionary dental changes.

B L Anderson, G W Thompson, F Popovich

    American Journal of Physical Anthropology
    |July 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Evolutionary trends show reduced primate jaw and tooth size correlating with body size. These dental changes, particularly in males, may stem from genetic reductions in overall body size.

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    Area of Science:

    • Anthropology
    • Evolutionary Biology
    • Dental Morphology

    Background:

    • Primates exhibit evolutionary trends towards reduced jaw length, prognathism, canine size, and molar cusp number.
    • These oral structures have been compared with cranial and body dimensions, as well as finger length.

    Purpose of the Study:

    • To investigate the relationships between oral structures and various anthropometric measurements in a human population.
    • To explore potential correlations between dental dimensions and genetically determined body size.

    Main Methods:

    • Comparison of dental dimensions (jaw length, prognathism, canine size, molar cusp number, third molar presence) with anthropometric data (cranial size, body weight, height, finger length).
    • Analysis conducted on 118 males and 102 females from the Burlington Growth Centre.

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    Main Results:

    • Body weight significantly correlated with canine width, jaw length, and prognathism, with stronger relationships observed in males.
    • Molar cusp number in males related to finger length and cranial height.
    • Third molar agenesis linked to maxillary length in both sexes.
    • In females, canine width correlated with first molar cusp number, third molar agenesis, and finger length.
    • Simultaneous reductions in dental structures were more frequent in females.

    Conclusions:

    • Evolutionary reduction in dental dimensions may be linked to a decrease in genetically determined body size.
    • Sexual dimorphism observed in the relationships between dental and anthropometric measurements.
    • Findings suggest complex interplay between genetic factors, body size, and craniofacial development.