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Progress in understanding hominoid dental development.

C Dean1

  • 1Evolutionary Anatomy Unit, Department of Anatomy and Developmental Biology, University College London, UK. ucgacrd@ucl.ac.uk

Journal of Anatomy
|September 22, 2000
PubMed
Summary
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Teeth reveal primate evolution through incremental growth lines. Dental development timing in fossil hominoids offers insights into human evolution, though body mass influence remains unclear.

Area of Science:

  • Paleoanthropology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Teeth contain incremental markings recording growth, enabling reconstruction of cellular activity and dental development timing in primates.
  • These markings are crucial for understanding morphological changes during evolution and the relationship between ontogeny and phylogeny.

Purpose of the Study:

  • To reconstruct cellular activity and dental development timing in living and fossil primates, including hominids.
  • To explore mechanisms of morphological change and the ontogeny-phylogeny relationship.
  • To estimate dental maturation periods in fossil hominoids using incremental markings.

Main Methods:

  • Analysis of incremental markings in enamel, dentine, and cementum to reconstruct cellular activity and development timing.

Related Experiment Videos

  • Calibration of key developmental events using incremental markings to estimate maturation periods in fossil hominoids.
  • Consideration of factors influencing dental development, such as tooth size, jaw space, and body mass.

    • Main Results:

    • Living great apes reach dental maturity around 11 years, with enamel formation time consistent regardless of thickness.
    • Differences in enamel formation time are attributed to ameloblast and odontoblast differentiation rates, not secretion rates.
    • Fossil hominoids and hominids show maturational profiles resembling modern monkeys and great apes, respectively.

    Conclusions:

    • Dental development timing in fossil hominoids can be estimated by analyzing incremental markings and considering various influencing factors.
    • The emergence of the modern human-like extended maturational profile is debated, possibly linked to archaic Homo sapiens or arising multiple times during human evolution.
    • The influence of body mass on primate dental development timing requires further investigation.