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Technical note: Modeling primate occlusal topography using geographic information systems technology

L F Zuccotti1, M D Williamson, W F Limp

  • 1Department of Anthropology and the Center for Advanced Spatial Technologies, University of Arkansas, Fayetteville 72701, USA.

American Journal of Physical Anthropology
|September 18, 1998
PubMed
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This study introduces a 3D modeling technique for primate molar topography using Geographic Resources Analysis Support System (GRASS) software. This method enhances the analysis of dental function and diet inference in fossil primates.

Area of Science:

  • Paleoanthropology
  • Primate Paleontology
  • Dental Morphology

Background:

  • Traditional functional analyses of primate teeth rely on limited linear or area measurements.
  • These methods offer restricted insight into occlusal relief and dental topography.
  • Dental topography differences are crucial for understanding tooth function and inferring diet from fossil teeth.

Purpose of the Study:

  • To present a novel technique for 3D modeling and comparison of primate molars.
  • To utilize Geographic Resources Analysis Support System (GRASS) software for detailed dental surface analysis.
  • To explore the implications of dental topography for diet reconstruction in extant and fossil primates.

Main Methods:

  • Collected approximately 400 landmarks on the occlusal surfaces of unworn lower second molars from three extant hominoids and two fossil species.

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  • Created raster "terrain models" of occlusal surfaces via interpolation of coordinate data.
  • Employed GRASS software for automated terrain analysis, quantifying cusp volumes/slopes and using watershed techniques to measure basin area and drainage patterns.

    • Main Results:

    • Successfully generated 3D terrain models of primate molar occlusal surfaces.
    • Quantified key topographical features such as cusp volumes, slopes, basin areas, and drainage characteristics using GRASS.
    • Demonstrated the utility of GRASS for characterizing and comparing complex tooth surfaces.

    Conclusions:

    • GRASS software provides a powerful tool for detailed 3D characterization and comparison of primate dental topography.
    • The described methodology offers significant potential for refining functional analyses and diet inference in paleoanthropology.
    • The technique is broadly applicable to the 3D analysis of various biological structures beyond teeth, including skulls and joints.