Depth Dependence of the Mechanical Properties of Human Enamel by Nanoindentation

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Nanoindentation has recently emerged to be the primary method to study the mechanical behavior and reliability of human enamel. Its hardness and elastic modulus were generally reported as average values with standard deviations that were calculated from the results of multiple nanoindentation tests. In such an approach, it is assumed that the mechanical properties of human enamel are constant, independent of testing parameters, like indent depth and loading rate. However, little is known if they affect the measurements. In this study, we investigated the dependence of the hardness and elastic modulus of human enamel on the indent depth. We found ... continued below

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Zhou, J & Hsiung, L L February 17, 2006.

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Nanoindentation has recently emerged to be the primary method to study the mechanical behavior and reliability of human enamel. Its hardness and elastic modulus were generally reported as average values with standard deviations that were calculated from the results of multiple nanoindentation tests. In such an approach, it is assumed that the mechanical properties of human enamel are constant, independent of testing parameters, like indent depth and loading rate. However, little is known if they affect the measurements. In this study, we investigated the dependence of the hardness and elastic modulus of human enamel on the indent depth. We found that in a depth range from 100 nm to 2000 nm the elastic moduli continuously decreased from {approx} 104 GPa to {approx} 70 GPa, and the hardnesses decreased from {approx} 5.7 GPa to {approx} 3.6 GPa. We then considered human enamel as a fiber-reinforced composite, and used the celebrated rule of mixture theory to quantify the upper and lower bounds of the elastic moduli, which were shown to cover the values measured in the current study and previous studies. Accordingly, we attributed the depth dependence of the hardness and modulus to the continuous microstructure evolution induced by nanoindenter.

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PDF-file: 30 pages; size: 2.3 Mbytes

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  • Journal Name: Journal of Biomedical Materials Research Part A, vol. 81A, no. 1, April 1, 2007, pp. 66-74; Journal Volume: 81A; Journal Issue: 1

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  • Report No.: UCRL-JRNL-219215
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919219
  • Archival Resource Key: ark:/67531/metadc886380

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 17, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 12:42 p.m.

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Zhou, J & Hsiung, L L. Depth Dependence of the Mechanical Properties of Human Enamel by Nanoindentation, article, February 17, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886380/: accessed January 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.