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Influence of environment on the mechanical behaviour of mature human enamel

Paper ID Volume ID Publish Year Pages File Format Full-Text
10753 701 2007 9 PDF Available
Title
Influence of environment on the mechanical behaviour of mature human enamel
Abstract

ObjectivesTo investigate the role of different environments in regulating the mechanical behaviour of mature human enamel.MethodsHealthy enamel samples were subjected to different environmental treatments such as ethanol dehydration, water re-hydration, desiccation at room temperature, and after heating (burnt) to 300 °C. Nanoindentation tests were done on all samples for determination of elastic modulus, hardness and indentation creep behaviour. Scanning electron microscopy (SEM) was used to observe surfaces and indentation impressions of different treated samples.ResultsStatistically significant differences of the mechanical properties were found following the various treatments. Burnt sample had the highest elastic modulus and hardness of ∼115 and ∼6 GPa, respectively, while the re-hydrated sample showed the lowest values of ∼95 and ∼4 GPa. The creep deformation showed the inverse response to the environment-induced elastic modulus results with negligible creep found for the burnt specimens. SEM showed that, although no significant structural changes were found for burnt samples after heating, there was much more cracking about the residual indentation impression.ConclusionsBecause of the chemical and thermal stability of hydroxyapatite under the experimental conditions investigated, differences of mechanical behaviour of enamel are rationalized in terms of changes to the matrix proteins and loss of water within enamel. These results indicate that matrix proteins play an important role in regulating the mechanical behaviour of enamel as a biocomposite.

Keywords
Enamel; Nanoindentation; Mechanical properties; Environment
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Influence of environment on the mechanical behaviour of mature human enamel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 28, Issue 30, October 2007, Pages 4512–4520
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
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Online Support
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