High energy X-ray diffraction measurement of load transfer between hydroxyapatite and collagen in bovine dentin

Alix C. Deymier, Jonathan D. Almer, Stuart R Stock, Dean R. Haeffner, David C Dunand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Dentin is a load bearing multiphase composite composed of a ceramic phase, hydroxyapatite (HAP), a polymeric phase, collagen, and fluid filled porosity. In order to create better dentin replacements it is important to understand how applied load is naturally transferred between the phases during chewing and other stresses. To determine the apparent elastic modulus of HAP in dentin, applied stress over lattice strain in HAP, high energy wide angle x-ray diffraction measurements were performed on in situ loaded bovine dentin samples. It was determined that the average longitudinal apparent elastic modulus of HAP in dentin was 18.3±2.19GPa. This value is much lower than values predicted by the Voigt model when combined with volume fractions determined for the sample by thermo-gravimetric and chemical analysis. It has been determined that the decrease in apparent elastic modulus is most likely due to a decrease in the "bulk" elastic modulus of HAP due to nanometric effects.

Original languageEnglish (US)
Title of host publicationStructure-Property Relationships in Biomineralized and Biomimetic Composites
Pages161-166
Number of pages6
Volume1187
StatePublished - Dec 1 2009
Event2009 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 14 2009Apr 17 2009

Other

Other2009 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period4/14/094/17/09

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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