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![[Figure 3]](ia5039fig3mag.jpg)
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Figure 3
Wide-angle X-ray diffraction patterns from bovine enamel in the sound and demineralized zones recorded with an X-ray image intensifier and a CCD camera. (a) Diffraction patterns from the sound and demineralized zones at about 30 µm from the surface. The exposure time was 300 ms. The small arrow in the sound pattern indicates the (100) equatorial reflections from the HAp crystallites. The large arrow indicates the (002) meridional reflection. The direction of the c-axis of the HAp crystal is parallel to the meridian. The isotropic scattering around the backstop is higher in the demineralized pattern, which is likely to be due to the increase in the void volume by demineralization as shown by the SAXS results (Fig. 4 ![[link]](../../../../../../logos/arrows/s_arr.gif) ). (b) Changes in the integrated (100) intensity with the depth in the enamel. Scans in six different areas were made in the sound and demineralized zones of each enamel sample, and the results were averaged in each zone. Then, to compensate for the difference in the thickness of the sample, the result from each area was normalized by the average intensity in the 150–200 µm region. The plot is an average of data from five samples from different teeth. (c) Comparison of the intensity changes of the equatorial (100) and the meridional (002) reflections. The meridional reflection has more fluctuation in intensity because the tilt of the c-axis towards the X-ray beam affects its intensity. |
![[Figure 3]](ia5039fig3.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
