Comparison of Calcium CPP, HAp and TeCP Phosphates, Obtained by Direct Reaction

Abstract:

In bioscience, there are several apatites constituteds by differents compositions. In the biological environment, apatites are found in bones and teeth of vertebrates with Ca/P ration from 2.0 to 0.5. It is not easy to determine the exact proportion of Ca2 + and PO43- in solution in the preparation of the process. In this study, apatites with Ca/P ration 1.0, 1.67 and 2.0 were prepared by direct reaction in an solution of H3PO4 in a suspension of Ca(OH)2, of same molarity, evalueting the crystallinity of CPP, Hap e TeCP with 1 mol/l, 3 mol/l and 5 mol/l. The samples characterized by X-ray diffraction (XRD) were compared with the standard of reference of the data base JCPDS. The composition of calcium phosphate for the differents molarity studied, resulted in a combination of phases with the exception of hydroxyapatite Ca/P ration 1.67 at concentrations 1 mol/l and 3 mol/l. But the diffractograms revealed that the increased molarity provided a decrease of some peaks of reflection of calcium phosphates with Ca/P ration 1.67. However, for the Ca/P ration 1.0 increasing the concentration, showed an increase of crystallinity of calcium phosphates. The FTIR confirmed the presence of phosphates in the spectrums around 1045 cm-1. The calcium phosphates obtained through direct reaction showed Ca/P ration is related with the technique employed, consolidating it in the preparation of these bioceramics.

• Periodical: Key Engineering Materials (Volumes 396-398)
• Pages: 557-560
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.396-398.557
• Online since: October 2008
• Authors: Sara Verusca de Oliveira, Marcus Vinícius Lia Fook, Elaine Patrícia Araújo, A.C.B.M. Fook, R.S.C. Lima, W.P.F. Barbosa
• Keywords: Bioceramic, Calcium Phosphate, Crystallinity

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