Properties of Calcium Phosphate Carbonate Cements

Published

October 16, 2008

Author(s)

Milenko Markovic, Shozo Takagi, Laurence C. Chow

Abstract

The physicochemical and mechanical properties of two calcium phosphate carbonate cements (CPCC-1 and CPCC-2) formed in solution reaction of (1) [alpha]-tricalcium phosphate ([alpha]-TCP),[alpha]-Ca₃(PO₄₎d2^, with calcium carbonate, CaCO₃, and (2) dicalcium phosphate unhydrous (DCPA), CaHPO₄, with CaCO₃, were determined in this study. Biological apatites normally contain carbonates (the carbonate content in human hard tissues is between 3 and 7 mass %) and therefore the objectives of this study were (I) to prepare CPCC in which carbonates are incorporated in OHAp products, (II) to determine their final hardening time (FHT), diametral tensile strength (DTS), composition and crystallinity, and (III) to compare the properties of CPCC-1 and CPCC-2 with those of CPC which contains TTCP and DCPA in the initial mixture. The FTIR data showed that in both CPCC-1 and CPCC-2, the type B carbonated OHAp (CO₃ for PO₄ substitution) was a major component. The XRD data indicated that the content of residual initial components was larger in CPCC-2([approximately] 15 mass %) than in CPCC-1([approximately] 5 mass %). The FHT of CPCC-1 was shorter than of CPCC-2, but longer than that of CPC. DTS of CPCC-1 was higher than that of CPCC-2, but lower than that of CPC. Because of the incorporated CO₃ in OHAp, both CPCCs had lower crystallinity than CPC.

Citation

Society for Biomaterials

Pub Type

Journals

Keywords

calcium phosphates, carbonate, cement, crystallinity, hardening, strength

Citation

Markovic, M. , Takagi, S. and Chow, L. (2008), Properties of Calcium Phosphate Carbonate Cements, Society for Biomaterials (Accessed December 10, 2024)