Developmental studies reveal links between mandibular corpus morphology and diet, but comparative research in primates does not support strong links between food mechanical properties (FMPs) and corpus morphology. We investigated the effects of variable stiffness (E, range=0.5-34MPa) and toughness (R, range=105-965Jm-2) in FMPs on mandibular strain patterns and magnitudes using in vivo experiments and finite element models (FEMs). We hypothesised that variation in strain magnitudes and orientations when chewing items with different FMPs is minimal at the corpus and greater at the lingual symphysis. FEM results confirmed that across all food items mean maximum principal strain (ε1) in the chewing side corpus had a range of 86 – 128 με for nuts, 68 – 88 με for soft food, and 38 – 62 με for dry fruit: comparable results were obtained from the in vivo experiment. Nevertheless, the peak ε1 in the symphysis in FEMs were 1199 με for nuts; 738 με for soft food and 544 με for dry fruit, higher than the corpus. Results also confirmed that strain at the lingual symphysis is relatively insensitive to variation in bite location, whereas strain magnitudes and orientations in the chewing side corpus varied more with bite point. These data suggest that if variation in primate mandibular morphology is driven by variation in strain patterns and magnitudes, then it is likely to be related to a combination of both feeding behaviour and FMPs, but with different factors being important at different mandibular sites.
|Number of pages||1|
|Publication status||Published - Apr 2018|
|Event||Annual Meeting of the American-Association-of-Physical-Anthropologists 2018 - Austin, United States of America|
Duration: 11 Apr 2018 → 14 Apr 2018
Conference number: 87th
|Conference||Annual Meeting of the American-Association-of-Physical-Anthropologists 2018|
|Abbreviated title||AAPA 2018|
|Country||United States of America|
|Period||11/04/18 → 14/04/18|
Panagiotopoulou, O., Iriarte-Díaz, J., Mehari Abraha, H., Taylor, A. B., Wilshin, S., Dechow, P. C., & Ross, C. F. (2018). Determinants of feeding behavior and food material properties on the deformations of the macaque mandible. Abstract from Annual Meeting of the American-Association-of-Physical-Anthropologists 2018, Austin, United States of America.