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Synchrotron X-ray diffraction study of load partitioning during elastic deformation of bovine dentin
- Source :
- Acta biomaterialia. 6(6)
- Publication Year :
- 2009
-
Abstract
- The elastic properties of dentin, a biological composite consisting of stiff hydroxyapatite (HAP) nano-platelets within a compliant collagen matrix, are determined by the volume fraction of these two phases and the load transfer between them. We have measured the elastic strains in situ within the HAP phase of bovine dentine by high energy X-ray diffraction for a series of static compressive stresses at ambient temperature. The apparent HAP elastic modulus (ratio of applied stress to elastic HAP strain) was found to be 18 ± 2 GPa. This value is significantly lower than the value of 44 GPa predicted by the lower bound load transfer Voigt model, using HAP and collagen volume fractions determined by thermo-gravimetric analysis. This discrepancy is explained by (i) a reduction in the intrinsic Young’s modulus of the nano-size HAP platelets due to the high fraction of interfacial volume and (ii) an increase in local stresses due to stress concentration around the dentin tubules.
- Subjects :
- Materials science
Biomedical Engineering
Modulus
Biochemistry
Biomaterials
Stress (mechanics)
stomatognathic system
X-Ray Diffraction
Hardness
Phase (matter)
Elastic Modulus
Materials Testing
Dentin
medicine
Animals
Composite material
Molecular Biology
Elastic modulus
Stress concentration
General Medicine
medicine.anatomical_structure
Volume fraction
X-ray crystallography
Cattle
Stress, Mechanical
Tooth
Synchrotrons
Biotechnology
Subjects
Details
- ISSN :
- 18787568
- Volume :
- 6
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Acta biomaterialia
- Accession number :
- edsair.doi.dedup.....954e46b13204829b735fa5d27463b11a