A micromechanics model of the elastic properties of human dentine
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, San Francisco, CA (United States). Dept. of Restorative Dentistry
A generalized self-consistent model of cylindrical inclusions in a homogeneous and isotropic matrix phase was used to study the effects of tubule orientation on the elastic properties of dentin. Closed form expressions for the five independent elastic constants of dentin were derived in terms of tubule concentration, and the Young's moduli and Poisson ratios of peri- and intertubular dentin. An atomic force microscope (AFM) indentation technique determined the Young's moduli of the peri- and intertubular dentin as approximately 30 GPa and 15 GPa, respectively. Over the natural variation in tubule density found in dentin, there was only a slight variation in the axial and transverse shear moduli with position in the tooth, and there was no measurable effect of tubule orientation. We conclude that tubule orientation has no appreciable effect on the elastic behavior of normal dentin, and that the elastic properties of healthy dentin can be modeled as an isotropic continuum with a Young's modulus of approximately 16 GPa and a shear modulus of 6.2 GPa.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 8421
- Report Number(s):
- UCRL-JC-133403; YN0100000; 97-LW-016
- Journal Information:
- Archives of Oral Biology, Vol. 44, Issue 10; ISSN 0003-9969
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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