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Spatial variation in mandibular bone elastic modulus and its effect on structural bending stiffness: A test case
Kim N Le1, Matthew Marsik2, David J Daegling1
1Department of Anthropology, University of Florida, Gainesville, FL 32611.
American Journal of Physical Anthropology
|November 19, 2016
Summary
Mandibular bone stiffness varies due to material heterogeneity, impacting jaw strength and stress distribution in primates. This non-random bone structure may have functional implications, though species-specific differences were not significant.
Area of Science:
- Primate paleontology
- Biomechanics
- Materials science
Background:
- Understanding the relationship between material properties and structural integrity is crucial in biomechanics.
- Cortical bone in primate mandibles exhibits variations in material stiffness, which can influence overall structural performance.
Purpose of the Study:
- To investigate how material stiffness heterogeneity affects structural stiffness in cercopithecid mandibular cortical bone.
- To determine if this heterogeneity alters interpretations of interspecific structural stiffness variation.
- To assess if heterogeneity is random and if it mitigates bending stress during food processing.
Main Methods:
- Vickers indentation hardness was used to estimate elastic moduli in the cortical bone of four primate species.
- Maximum area moment of inertia (Imax) was calculated using three material heterogeneity models.
- Spatial autocorrelation statistics (Moran's I) were employed to analyze the patterning of material properties.
Main Results:
- Incorporating material stiffness variation and spatial patterning decreased Imax and altered individual ranks of structural stiffness.
- All specimens exhibited positive, non-random spatial autocorrelation in material properties.
- Significant local spatial autocorrelation was often linked to the juxtaposition of low and high elastic moduli within the jawbone.
Conclusions:
- While species-level differences in spatial autocorrelation were not significant, mechanical effects of heterogeneity may distinguish primate subfamilies.
- The functional significance of this bone heterogeneity in relation to diet and taxonomy warrants further investigation.
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