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Interproximal grooving and task activity in Australia.

T Brown1, S Molnar

  • 1Department of Dentistry, University of Adelaide, South Australia.

American Journal of Physical Anthropology
|April 1, 1990
PubMed
Summary
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Interproximal grooving in 19th-century Aboriginal skulls suggests a unique cause. Task activity, like stripping animal sinews, likely created these dental lesions, not toothpicking.

Area of Science:

  • Paleopathology
  • Bioarchaeology
  • Forensic Anthropology

Background:

  • Interproximal grooving is a rare dental anomaly observed in various human populations.
  • Previous studies have attributed this condition to habitual toothpicking or other oral behaviors.

Purpose of the Study:

  • To investigate the prevalence and characteristics of interproximal grooving in 19th-century Aboriginal skulls from South Australia.
  • To determine the potential etiological factors responsible for the observed dental lesions.

Main Methods:

  • Analysis of 85 Aboriginal skulls from Swanport, South Australia, dating to the 19th century.
  • Macroscopic examination of teeth for evidence of interproximal grooving, noting location, frequency, and morphology.
  • Comparison of grooving patterns between sexes and across different tooth types.

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Main Results:

  • 41% of individuals exhibited one or more grooved teeth, with males showing twice the frequency compared to females.
  • Distal grooving (93 teeth) was significantly more common than mesial grooving (5 teeth).
  • Lesions were typically horizontal, clean-cut, located at the cementoenamel junction in the premolar-molar region, and caries-free.

Conclusions:

  • The observed interproximal grooving in this Aboriginal population is unlikely to be caused by toothpicking.
  • Task activity, specifically the stripping of animal sinews between the posterior teeth, is proposed as the probable cause of these dental grooves.