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Structural characterization of HAP crystallites in dental enamel. FESEM images of crystallites in (a) region close to the enamel surface, and (b) region close to the dentin-enamel junction. The corresponding two-dimensional SAXS patterns are shown at the top left of the FESEM images. The scattering intensity is shown in gray levels. Scale bars, .
The -averaged scattering intensity is shown as a function of the azimuth for (a) a highly anisotropic SAXS pattern [cf. Fig. 1(a)], and (b) a less anisotropic SAXS pattern obtained from the dental sample. The solid line is a fit to the data by two Gaussian functions and a constant background.
Quantitative correlation between mechanical properties and local alignment of minerals within the dental sample. (a) Hardness vs alignment. (b) Elastic modulus vs alignment. The solid circles and the hollow circles represent data measured from dental enamel and dentin, respectively.
(Color online) Structure model for optimized strength in biocomposites. (a) FESEM image of enamel near the tooth surface. The nanocomposites are made of uniform, aligned biominerals and soft matrix. Scale bar, 200 nm. (b) and (c) Schematic diagrams of load-carrying structure of the composites with well-aligned, staggered minerals under a stress parallel and perpendicular to the long axis of the crystal. The matrix continuously transfers load via the shear and tension zones between the minerals, resulting in the load being mainly carried by the ordered minerals.
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