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Role of crystal arrangement on the mechanical performance of enamel

Paper ID Volume ID Publish Year Pages File Format Full-Text
498 45 2012 10 PDF Available
Title
Role of crystal arrangement on the mechanical performance of enamel
Abstract

The superior mechanical properties of enamel, such as excellent penetration and crack resistance, are believed to be related to the unique microscopic structure. In this study, the effects of hydroxyapatite (HAP) crystallite orientation on the mechanical behavior of enamel have been investigated through a series of multiscale numerical simulations. A micromechanical model, which considers the HAP crystal arrangement in enamel prisms, the hierarchical structure of HAP crystals and the inelastic mechanical behavior of protein, has been developed. Numerical simulations revealed that, under compressive loading, plastic deformation progression took place in enamel prisms, which is responsible for the experimentally observed post-yield strain hardening. By comparing the mechanical responses for the uniform and non-uniform arrangement of HAP crystals within enamel prisms, it was found that the stiffness for the two cases was identical, while much greater energy dissipation was observed in the enamel with the non-uniform arrangement. Based on these results, we propose an important mechanism whereby the non-uniform arrangement of crystals in enamel rods enhances energy dissipation while maintaining sufficient stiffness to promote fracture toughness, mitigation of fracture and resistance to penetration deformation. Further simulations indicated that the non-uniform arrangement of the HAP crystals is a key factor responsible for the unique mechanical behavior of enamel, while the change in the nanostructure of nanocomposites could dictate the Young’s modulus and yield strength of the biocomposite.

Graphical abstractComparison of the densities of plastic energy dissipation with the non-uniform and uniform arrangement of crystallites in enamel prisms. Comparison of the plastic deformation distribution with the non-uniform and uniform arrangement of crystallites in enamel prisms.Figure optionsDownload full-size imageDownload high-quality image (67 K)Download as PowerPoint slide

Keywords
Enamel; HAP crystal; Mechanical behavior; Hierarchy; Numerical modeling
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Role of crystal arrangement on the mechanical performance of enamel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 8, Issue 10, October 2012, Pages 3784–3793
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us