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Allometry of masticatory loading parameters in mammals.

Matthew J Ravosa1, Callum F Ross, Susan H Williams

  • 1Department of Pathology and Anatomical Sciences, University of Missouri School of Medicine, One Hospital Drive, Columbia, MO 65212, USA. ravosam@missouri.edu

Anatomical Record (Hoboken, N.J. : 2007)
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Summary

Mammal jawbone strain is similar across body sizes, but chewing frequency decreases with larger body size. This suggests similar scaling principles apply to both chewing and walking systems.

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Area of Science:

  • Comparative biomechanics
  • Mammalian anatomy
  • Functional morphology

Background:

  • Extensive research exists on limb loading patterns in mammals.
  • A gap in knowledge persists regarding the scaling of loading in the mammalian masticatory (chewing) complex.
  • Understanding jawbone strain scaling is crucial for craniomandibular research.

Purpose of the Study:

  • To analyze interspecific scaling of mandibular corpus bone strain in mammals.
  • To compare loading regimes in the masticatory complex with those in the locomotor system.
  • To investigate how body size influences masticatory loading parameters.

Main Methods:

  • Collected mandibular corpus bone strain data from 11 mammalian taxa of varying body sizes.
  • Utilized rosette gauges on the lateral aspect of the mandibular corpus during chewing and biting.
  • Characterized masticatory loading parameters: peak loading, cycle duration, frequency, duty factor, loading rate, and time.

Main Results:

  • Peak bone-strain magnitudes were similar across mammals of different body sizes, mirroring limb element scaling.
  • Chewing frequency showed an inverse correlation with body size, similar to locomotor stride frequency.
  • Occlusal duty factor remained constant across body sizes, unlike chewing frequency and loading time.

Conclusions:

  • Mammalian masticatory systems exhibit scaling patterns analogous to locomotor systems.
  • Body size influences chewing frequency and loading time, but not peak strain or occlusal duty factor.
  • Findings provide insights into craniomandibular growth, form, function, allometry, and osteogenic stimuli across mammals.