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Uniaxial compressive behavior of micro-pillars of dental enamel characterized in multiple directions
Publikationstyp
Journal Article
Date Issued
2015-01-22
Sprache
English
Author(s)
TORE-URI
Journal
Volume
16
Issue
1
Start Page
187
End Page
195
Citation
Acta Biomaterialia 1 (16): 187-195 (2015)
Publisher DOI
Scopus ID
Publisher
Elsevier
In this work, the compressive elastic modulus and failure strength values of bovine enamel at the first hierarchical level formed by hydroxyapatite (HA) nanofibers and organic matter are identified in longitudinal, transverse and oblique direction with the uniaxial micro-compression method. The elastic modulus values (∼70 GPa) measured here are within the range of results reported in the literature but these values were found surprisingly uniform in all orientations as opposed to the previous nanoindentation findings revealing anisotropic elastic properties in enamel. Failure strengths were recorded up to ∼1.7 GPa and different failure modes (such as shear, microbuckling, fiber fracture) governed by the orientation of the HA nanofibers were visualized. Structural irregularities leading to mineral contacts between the nanofibers are postulated as the main reason for the high compressive strength and direction- independent elastic behavior on enamels first hierarchical level.
Subjects
Biological materials
Dental enamel
Hydroxyapatite
Mechanical properties
Micro-compression
DDC Class
570: Biowissenschaften, Biologie
600: Technik