|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Biological Materials Science
||Micromechanical and Microstructural Studies of Wavy Enamel in the Grinding Dentition of Hadrosaurid Dinosaurs: Understanding Its Remarkable Damage Tolerance and Fracture Resistance
||Soumya Varma, Yi Teng Lee, Shane Johnson, D. G. Harlow, Tomas Grejtak, Brandon Krick, Tyler Hunt, Gregory M. Erickson, Manish Jain, Johann Jakob Schwiedrzik, Johann Mitchler, Daniele Casari, Sandip Basu, Shraddha J. Vachani, Sid Pathak, Arun Devraj
|On-Site Speaker (Planned)
This research aims to understand the structure-property relationship of crenulated wavy enamel (CWE) found in herbivorous hadrosaurid dinosaurs. Preliminary analysis of the tissue showed an undulating wavy structure composed of folded layers of hydroxyapatite crystallites separated by thin layers of a loosely aggregated interlayer matrix.
CWE exhibits remarkable fracture resistance, damage localization, and controlled crack directionality, how this bi-partite enamel composite achieves this remained unknown.
To investigate these properties, we utilized optical profilometry, BSE-SEM, and APT for microstructural analysis. We correlated this information with spherical nanoindentation and micropillar compression experiments quantifying elastic (Modulus) and plastic (Yield Strength, Fracture Stress) properties at individual layers (few Ám3 volumes) and at the global CWE ensemble level (10s of Ám3 volumes). Interestingly, the elastic mismatch between layers in combination with the kinking of layers, enhances damage tolerance exclusively in the transverse/occlusal plane, promoting integrity of the enamel crest.
||Biomaterials, Ceramics, Mechanical Properties