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Proceedings Paper

Tooth and bone deformation: structure and material properties by ESPI
Author(s): Paul Zaslansky; Ron Shahar; Meir M. Barak; Asher A. Friesem; Steve Weiner
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Paper Abstract

In order to understand complex-hierarchical biomaterials such as bones and teeth, it is necessary to relate their structure and mechanical-properties. We have adapted electronic speckle pattern-correlation interferometry (ESPI) to make measurements of deformation of small water-immersed specimens of teeth and bones. By combining full-field ESPI with precision mechanical loading we mapped sub-micron displacements and determined material-properties of the samples. By gradually and elastically compressing the samples, we compensate for poor S/N-ratios and displacement differences of about 100nm were reliably determined along samples just 2~3mm long. We produced stress-strain curves well within the elastic performance range of these materials under biologically relevant conditions. For human tooth-dentin, Young's modulus in inter-dental areas of the root is 40% higher than on the outer sides. For cubic equine bone samples the compression modulus of axial orientations is about double the modulus of radial and tangential orientations (20 GPa versus 10 GPa respectively). Furthermore, we measured and reproduced a surprisingly low Poisson's ratio, which averaged about 0.1. Thus the non-contact and non-destructive measurements by ESPI produce high sensitivity analyses of mechanical properties of mineralized tissues. This paves the way for mapping deformation-differences of various regions of bones, teeth and other biomaterials.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 634109 (15 September 2006); doi: 10.1117/12.695264
Show Author Affiliations
Paul Zaslansky, Weizmann Institute of Science (Israel)
Ron Shahar, The Hebrew Univ. of Jerusalem (Israel)
Meir M. Barak, Weizmann Institute of Science (Israel)
Asher A. Friesem, Weizmann Institute of Science (Israel)
Steve Weiner, Weizmann Institute of Science (Israel)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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