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Title: Crystal misorientation correlates with hardness in tooth enamels

Source: Acta Biomaterialia

Author(s)Stifler, Cayla A.; Jakes, Joseph E.; North, Jamie D.; Green, Daniel R.; Weaver, James C.; Gilbert, Pupa U.P.A.

Publication Year: 2021  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-3C

Abstract: The multi-scale hierarchical structure of tooth enamel enables it to withstand a lifetime of damage without catastrophic failure. While many previous studies have investigated structure-function relationships in enamel, the effects of crystal misorientation on mechanical performance have not been assessed. To address this issue, in the present study, we review previously published polarization-dependent imaging contrast (PIC) maps of mouse and human enamel, and parrotfish enameloid, in which crystal orientations were measured and displayed in every 60-nm-pixel. By combining those previous results with the PIC maps of sheep enamel presented here we discovered that, in all enamel(oid)s, adjacent crystals are slightly misoriented, with misorientation angles in the 0°-30° range, and mean 2°-8°. Within this limited range, misorientation is positively correlated with literature hardness values, demonstrating an important structure-property relation, not previously identified. At greater misorientation angles 8°30°, this correlation is expected to reverse direction, but data from different non-enamel systems, with more diverse crystal misorientations, are required to determine if and where this occurs

Keywords: Enamel; misorientation; PIC maps; hardness

Publication Review Process: Formally Refereed

File size: 3,072 kb(s)

Date posted: 03/17/2021

This publication is also viewable on Treesearch:  view
RITS Product ID: 10128
Current FPL Scientist associated with this product
Jakes, Joseph
Research Materials Engineer

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