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Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin.

Publication ,  Journal Article
Deymier-Black, AC; Singhal, A; Yuan, F; Almer, JD; Brinson, LC; Dunand, DC
Published in: Journal of the mechanical behavior of biomedical materials
May 2013

Under long-term loading creep conditions, mineralized biological tissues like bone are expected to behave in a similar manner to synthetic composites where the creeping matrix sheds load to the elastic reinforcement as creep deformation progresses. To study this mechanism in biological composites, creep experiments were performed at 37 °C on bovine compact bone and dentin. Static compressive stresses were applied to the samples, while wide- and small-angle scattering patterns from high energy synchrotron X-rays were used to determine, respectively, the elastic strain in the hydroxyapatite (HAP) platelets and the strain in the mineralized collagen fibril, as a function of creep time. In these highly irradiated biological composites, the reinforcing hydroxyapatite platelets progressively transfer some of their stress back to the softer protein matrix during creep. While such behavior can be explained by damage at the interface between the two phases, it is not consistent with measurements of the apparent moduli--the ratio of applied stress to elastic HAP strain measured throughout the creep experiments by elastic unload/load segments--which remained constant throughout the experiment and thus indicated good HAP/protein bonding. A possible explanation is a combination of X-ray and load induced interfacial damage explaining the shedding of load from the HAP during long term creep, coupled with interfacial re-bonding of the load-disrupted reversible bonds upon unloading, explaining the unaffected elastic load partitioning during unload/load segments. This hypothesis is further supported by finite element modeling which shows results mirroring the experimental strain measurements when considering interfacial delamination and a compliant interstitial space at the ends of the HAP platelets.

Duke Scholars

Published In

Journal of the mechanical behavior of biomedical materials

DOI

EISSN

1878-0180

ISSN

1751-6161

Publication Date

May 2013

Volume

21

Start / End Page

17 / 31

Related Subject Headings

  • X-Rays
  • Viscosity
  • Radiation Dosage
  • Models, Biological
  • In Vitro Techniques
  • Femur
  • Elastic Modulus
  • Dentin
  • Computer Simulation
  • Compressive Strength
 

Citation

APA
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ICMJE
MLA
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Deymier-Black, A. C., Singhal, A., Yuan, F., Almer, J. D., Brinson, L. C., & Dunand, D. C. (2013). Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin. Journal of the Mechanical Behavior of Biomedical Materials, 21, 17–31. https://doi.org/10.1016/j.jmbbm.2013.01.016
Deymier-Black, Alix C., Anjali Singhal, Fang Yuan, Jonathan D. Almer, L Catherine Brinson, and David C. Dunand. “Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin.Journal of the Mechanical Behavior of Biomedical Materials 21 (May 2013): 17–31. https://doi.org/10.1016/j.jmbbm.2013.01.016.
Deymier-Black AC, Singhal A, Yuan F, Almer JD, Brinson LC, Dunand DC. Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin. Journal of the mechanical behavior of biomedical materials. 2013 May;21:17–31.
Deymier-Black, Alix C., et al. “Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin.Journal of the Mechanical Behavior of Biomedical Materials, vol. 21, May 2013, pp. 17–31. Epmc, doi:10.1016/j.jmbbm.2013.01.016.
Deymier-Black AC, Singhal A, Yuan F, Almer JD, Brinson LC, Dunand DC. Effect of high-energy X-ray irradiation on creep mechanisms in bone and dentin. Journal of the mechanical behavior of biomedical materials. 2013 May;21:17–31.
Journal cover image

Published In

Journal of the mechanical behavior of biomedical materials

DOI

EISSN

1878-0180

ISSN

1751-6161

Publication Date

May 2013

Volume

21

Start / End Page

17 / 31

Related Subject Headings

  • X-Rays
  • Viscosity
  • Radiation Dosage
  • Models, Biological
  • In Vitro Techniques
  • Femur
  • Elastic Modulus
  • Dentin
  • Computer Simulation
  • Compressive Strength