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Related Concept Videos

Teeth01:15

Teeth

352
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
352

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Pongo's ecological diversity from dental macrowear analysis.

Luca Fiorenza1, D Rex Mitchell2,3, Ottmar Kullmer4,5

  • 1Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia.

American Journal of Biological Anthropology
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Summary

Orangutan molar wear shows no significant differences between Bornean (Pongo pygmaeus) and Sumatran (Pongo abelii) species, suggesting similar long-term diets. Wear patterns may not reflect seasonal feeding variations in these frugivorous apes.

Keywords:
dental topographygreat apesocclusal fingerprint analysisprimate diet

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Area of Science:

  • Primate Paleontology
  • Dental Anthropology
  • Zoology

Background:

  • Orangutans (Pongo pygmaeus, Pongo abelii, Pongo tapanuliensis) inhabit Borneo and Sumatra, primarily feeding on fruits.
  • Ecological studies indicate dietary differences, with Pongo pygmaeus consuming more low-quality foods like bark than Pongo abelii.
  • Investigating geographic variations in dental macrowear can reveal insights into feeding ecology and diet adaptation.

Purpose of the Study:

  • To investigate geographic variations in molar macrowear patterns between Bornean (Pongo pygmaeus) and Sumatran (Pongo abelii) orangutans.
  • To determine if observed dietary differences correlate with distinct dental wear patterns.

Main Methods:

  • Analysis of second mandibular molars from 58 orangutan specimens.
  • Utilized dental topographic measurements including occlusal relief index, dentine exposure, and enamel wear.
  • Employed the occlusal fingerprint analysis method to assess macrowear patterns.

Main Results:

  • No statistically significant differences were found in most molar macrowear variables between Pongo abelii and Pongo pygmaeus.
  • Pongo pygmaeus molars exhibited slightly flatter occlusal morphology and larger crushing areas, but these differences were not significant.
  • A greater variability in molar wear was observed in Pongo pygmaeus compared to Pongo abelii.

Conclusions:

  • The similarity in molar macrowear suggests overlapping long-term diets, predominantly ripe fruits, for both orangutan species.
  • Dental macrowear reflects cumulative lifetime wear, potentially obscuring short-term or seasonal dietary shifts.
  • Future research integrating micro- and macrowear analysis could provide a more comprehensive understanding of primate dental ecology.