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Influence of the indenter tip geometry and environment on the indentation modulus of enamel

Published online by Cambridge University Press:  31 January 2011

G.M. Guidoni ,
L.H. He ,
T. Schöberl ,
I. Jäger ,
G. Dehm  and
M.V. Swain
G.M. Guidoni*
Affiliation:
Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, A-8700, Austria; and Department of Material Physics, University of Leoben, Leoben, A-8700, Austria
L.H. He
Affiliation:
Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, United Dental Hospital, Sydney, Surry Hills NSW 2010, Australia
T. Schöberl
Affiliation:
Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, A-8700, Austria
I. Jäger
Affiliation:
Department of Material Physics, University of Leoben, Leoben, A-8700, Austria
G. Dehm
Affiliation:
Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, A-8700, Austria; and Department of Material Physics, University of Leoben, Leoben, A-8700, Austria
M.V. Swain*
Affiliation:
Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, United Dental Hospital, Sydney, Surry Hills NSW 2010, Australia; and Biomaterials Unit, Department of Oral Sciences, School of Dentistry, University of Otago, Dunedin, New Zealand
*
a) Address all correspondence to this author. e-mail: Griselda.guidoni@notes.unileoben.ac.at
b) This author was an editor of this focus issue during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy
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Abstract

The aim of the investigation was to study the influence of indenter tip geometry on the conventionally obtained indentation modulus of enamel by nanoindentation. Indentation tests on bovine enamel using three different diamond pyramidal indenters with half face angles 65.27°, 45°, and 35.26° were conducted to evaluate the indentation modulus using the Oliver–Pharr method [W.C. Oliver and G.M. Pharr, J. Mater. Res.7, 1564 (1992)]. In addition, three different dehydration conditions were studied: wet under Hank's balanced salt solution, laboratory dried, and vacuum dehydrated. For the Berkovich indenter (65.27°) and 45° pyramidal indenters, there was only a small difference between indentation modulus values, whereas for the cube-corner indenter (35.26°) a ratio of 2.4 between laboratory dry and wet samples was found. A detailed evaluation, including indentation creep and recovery as well as pileup, resulted in a reduction of this latter ratio to 1.7. This still large difference was rationalized on the basis of the different deformation mechanisms generated by indenters of different face angles.

Keywords

BiologicalElastic propertiesNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 616 - 625
Copyright
Copyright © Materials Research Society 2009

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