Exact symmetry and perfect balance between opposite jaw halves as well as between antagonistic teeth is not frequently observed in natural masticatory systems. Research results show that asymmetry in our body, skull and jaws is related to non-genetic environmental and individual ontogenetic factors. However, modern humans exhibit increased variability in tooth positions and asymmetry compared to non-human primates and most fossil hominins. The present work investigates the relationship between dental macrowear patterns and alveolar inclinations on a sample of complete maxillary and mandibular 3D models of dental arches from 19 young and adult Yuendumu Aboriginal individuals. The analysis was carried out on first molars (M1) from all quadrants. Virtual models were oriented identifying a standard plane for each jaw. Occlusal fingerprint analysis was used to obtain M1 macrowear patterns, and 2D cross-sectional geometric analysis of the jaws was carried out to investigate asymmetry in dental arches. Asymmetry observed in the present sample is highly variable on both arches, and it is associated with differences in the inclination of upper M1 crowns. Wear facet position on opposite teeth also reflects differences in inclination of the molars between left and right sides. Our results suggest that overall asymmetry in the masticatory apparatus of modern humans affects contact between opposing teeth to the extent of heavily conditioning the observed macrowear patterns.
|Publication status||Published - 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|
- Dental anthropology
- Australian aboriginal and torres strait islanders
- Tooth wear
Oxilia, G., Bartolini, E., Martini, S., Papini, A., Boggioni, M., Townsend, G. C., Kaidonis, J., Fiorenza, L., Cristiani, E., Kullmer, O., Moggi-Cecchi, J., & Benazzi, S. (2018). The physiological linkage between dental arch asymmetry, alveolar inclination and dental macrowear pattern. Abstract from Annual Meeting of the American-Association-of-Physical-Anthropologists 2018, Austin, United States of America.