Biomedical Engineering Reference
In-Depth Information
Figure 11 . 3 TEM micrographs of calcium-deicient apatites with diff-
erent Ca/P ratios: (a) Ca/P = 1.5, (b) Ca/P = 1.55, (c) Ca/P = 1.6
and (d) Ca/P = 1.67 [13].
The amplitude of FT in the EXAFS spectra indicates that the
structural disorder increases, following the sequence of 1.67 > 1.5
> 1.6 > 1.55, implying that stoichiometry and non-stoichiometry
plays a more important role than the structural order-disorder.
This may suggest that different biochemical properties between
Ca/P = 1.5 and 1.67 is mostly due to the effect of stoichiometry and
non-stoichiometry.
References
1. Al-Ahmad, A., Roth, D., Wolkewitz, M., Wiedmann-Al-Ahmad, M., Follo,
M., Ratka-Kruger, P., Deimling, D., Hellwig, E., and Hannig, C. (2009).
Change in diet and oral hygiene over an 8-week period: effects on oral
health and oral bioilm, Clin . Oral Investig ., 14 , pp. 391-396.
2. Allan, I., Newman, H., and Wilson, M. (2001). Antibacterial activity
of particulate bioglass against supra- and subgingival bacteria,
Biomaterials , 22 , pp. 1683-1687.
3. Brunner, T.J., Grass, R.N., and Stark, W.J. (2006). Glass and bioglass
nanopowders by lame synthesis, Chem . Commun ., 7 , pp. 1384-1386.
 
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