Journal
NANO LETTERS
Volume 15, Issue 6, Pages 3729-3734Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00143
Keywords
X-ray diffraction; apatite; residual strain; mineralized-collagen-fibers; diffraction nanotomography
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Funding
- DFG [SPP1420]
- Shore Research Fund in Advanced Composites (Technion)
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The tough bulk of dentin in teeth supports enamel, creating cutting and grinding biostructures with superior failure resistance that is not fully understood. Synchrotron-based diffraction methods, utilizing micro- and nanofocused X-ray beams, reveal that the nm-sized mineral particles aligned with collagen are precompressed and that the residual strains vanish upon mild annealing. We show the link between the mineral nanoparticles and known damage propagation trajectories in dentin, suggesting a previously overlooked compression-mediated toughening mechanism.
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