High energy X-ray scattering quantification of in situ-loading-related strain gradients spanning the dentinoenamel junction (DEJ) in bovine tooth specimens

J. D. Almer, S. R. Stock*

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

High energy X-ray scattering (80.7. keV photons) at station 1-ID of the Advanced Photon Source quantified internal strains as a function of applied stress in mature bovine tooth. These strains were mapped from dentin through the dentinoenamel junction (DEJ) into enamel as a function of applied compressive stress in two small parallelepiped specimens. One specimen was loaded perpendicular to the DEJ and the second parallel to the DEJ. Internal strains in enamel and dentin increased and, as expected from the relative values of the Young's modulus, the observed strains were much higher in dentin than in enamel. Large strain gradients were observed across the DEJ, and the data suggest that the mantle dentin-DEJ-aprismatic enamel structure may shield the near-surface volume of the enamel from large strains. In the enamel, drops in internal strain for applied stresses above 40. MPa also suggest that this structure had cracked.

Original languageEnglish (US)
Pages (from-to)2294-2300
Number of pages7
JournalJournal of Biomechanics
Volume43
Issue number12
DOIs
StatePublished - Aug 1 2010

Keywords

  • Dentin
  • Dentinoenamel junction (DEJ)
  • Enamel
  • High energy X-ray scattering
  • Strain mapping
  • Synchrotron X-radiation
  • Tooth

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

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