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The physiological linkage between molar inclination and dental macrowear pattern.

Gregorio Oxilia1,2,3, Eugenio Bortolini3, Sergio Martini4

  • 1Department of Oral and Maxillo Facial Sciences, Sapienza University, Via Caserta 6, Roma 00161, Italy.

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Masticatory asymmetry, influenced by tooth inclination, significantly impacts occlusal contacts and wear patterns in human dental arches. This asymmetry affects chewing efficiency and wear distribution during development.

Keywords:
asymmetrydental functionpalatal archswallowingtooth wear

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Area of Science:

  • Anthropology
  • Paleontology
  • Biomechanics

Background:

  • Masticatory systems exhibit natural asymmetry due to genetic, epigenetic, environmental, and developmental factors.
  • Understanding this asymmetry is crucial for analyzing wear patterns and function in the human jaw.

Purpose of the Study:

  • To investigate the link between masticatory asymmetry and occlusal contact in antagonist teeth.
  • To test if tooth inclination influences wear distribution during mastication.

Main Methods:

  • Analysis of first molars (M1) from 3D dental arch models of 19 Aboriginal individuals.
  • Utilized Occlusal Fingerprint Analysis for macrowear quantification.
  • Employed 2D geometric analysis to assess dental arch asymmetry.

Main Results:

  • Dental arch asymmetry is highly variable and linked to differences in upper M1 crown inclination.
  • Variable molar inclination (buccal/lingual) affects tooth-to-tooth contact and wear patterns.
  • Interindividual variation in occlusal relationships is a key factor in macrowear analysis.

Conclusions:

  • Masticatory apparatus asymmetry influences occlusal contact areas between teeth.
  • This asymmetry affects macrowear and chewing efficiency throughout human development.