Vibrational spectroscopic study of tetracalcium phosphate in pure polycrystalline form and as a constituent of a self-setting bone cement
✍ Scribed by Posset, U. ;L�cklin, E. ;Thull, R. ;Kiefer, W.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 190 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
Polycrystalline tetracalcium phosphate (TTCP), a material of considerable interest for human implantation due to its similarity to hydroxyapatite, was studied by means of Raman and FT-IR spectroscopy. The spectra were interpreted on the basis of group theoretical considerations. In addition, the setting reaction of a calcium phosphate cement (CPC) consisting of an equimolar mixture of TTCP and dicalcium phosphate (DCPA) was investigated by Raman spectroscopy. The band of the totally symmetric phosphate mode 1 of TTCP showed marked factor group splittings. The splitting components arose at coincident wave numbers in the IR and Raman spectra. This observation was in accor-dance with space group P2 1 (factor group C 2 2 , Z = 4). The characteristic splitting of 1 allowed the setting reaction of CPC to hydroxyapatite to be followed. According to the Raman spectroscopic results, considerable amounts of TTCP must be present at the sample surface after 24 h of setting in an aqueous environment.