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Tooth size and the Carabelli trait.

C Reid1, J F van Reenen, H T Groeneveld

  • 1Department of Anatomy and Human Biology, Medical School, University of Witwatersrand, South Africa.

American Journal of Physical Anthropology
|April 1, 1991
PubMed
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The Carabelli trait, a dental characteristic, was studied in a Namibian community. Larger molar crown base areas were observed in individuals with the trait, particularly in first molars.

Area of Science:

  • Anthropology
  • Human Biology
  • Dental Morphology

Background:

  • The Carabelli trait is a common morphological variation in human maxillary molars.
  • Understanding its expression and association with tooth size is important for anthropological and genetic studies.

Purpose of the Study:

  • To investigate the association between the Carabelli trait and maxillary molar crown base and cusp size.
  • To analyze the expressivity of the Carabelli trait in relation to molar size within the Kwengo community.

Main Methods:

  • A sample of 128 individuals from the Kwengo community in Namibia was assessed.
  • The Carabelli trait was classified using a modified scheme by Dahlberg and Scott.
  • Maxillary molar crown base and cusp areas were measured and compared between trait-positive and trait-negative individuals.

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Main Results:

  • Individuals with the Carabelli trait exhibited larger maxillary molar crown base areas compared to those without the trait.
  • This association was consistent across all eight categories of the trait for first molars and most categories for second and third molars.
  • The degree of Carabelli trait expressivity showed a correlation with molar size, more pronounced in first molars.

Conclusions:

  • The Carabelli trait is significantly associated with increased maxillary molar crown base size.
  • Molar size appears to influence the expressivity of the Carabelli trait.
  • These findings contribute to the understanding of dental trait variation in human populations.