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Related Experiment Videos

Molar polymorphisms and body growth.

D L Anderson, G W Thompson, F Popovich

    Growth
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Children with agenesis (missing) of third molars or fewer cusps on their first molars experienced delayed adolescent growth. This dental reduction may indicate a later maturation and evolutionary trend in human development.

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    Area of Science:

    • Human growth and development
    • Dental anthropology
    • Evolutionary biology

    Background:

    • Adolescent growth patterns are crucial for overall development.
    • Dental anomalies, such as agenesis of third molars and variations in first molar cusp number, are observed in human populations.
    • Previous research suggests potential links between dental development and skeletal maturation.

    Purpose of the Study:

    • To investigate the association between dental anomalies (third molar agenesis, mandibular first molar cusp number) and adolescent growth timing.
    • To compare growth trajectories in height and weight between individuals with and without these dental variations.
    • To explore potential sex-specific differences in these associations.

    Main Methods:

    • Longitudinal growth data from the Burlington Growth Centre serial experimental sample.

    Related Experiment Videos

  • Categorization of participants based on third molar presence/absence and mandibular first molar cusp count (4-cusped vs. 5-cusped).
  • Statistical analysis of growth parameters including peak height velocity, growth spurt completion, and pre/post-peak gains.

    • Main Results:

    • Children with third molar agenesis or 4-cusped first molars exhibited delayed adolescent growth, including later peak growth increment and growth spurt completion.
    • These groups showed less pre-peak adolescent gain and greater post-peak gain in height and weight.
    • Significant sex-specific differences were observed: boys' growth varied by third molar presence, while girls' growth differed by first molar cusp number.

    Conclusions:

    • Dental reductions, including third molar agenesis and fewer first molar cusps, are associated with delayed adolescent maturation.
    • Skeletal age showed temporary advancement before adolescence, followed by a delay during peak growth, with catch-up by the end of the spurt.
    • These findings suggest that later maturation linked to dental reduction might represent an evolutionary trend in humans.