Improvement of the mechanical properties of new calcium phosphate bone cements in the CaHPO4-?-Ca3(PO4)2 system: Compressive strength and microstructural development
✍ Scribed by Fern�ndez, E. ;Gil, F. J. ;Best, S. M. ;Ginebra, M. P. ;Driessens, F. C. M. ;Planell, J. A.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 427 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
The hardening properties of calcium phosphate cements in the CaHPO4-alpha-Ca3(PO4)2 (DCP-alpha-TCP) system have been investigated with interest focused on the compressive strength and microstructure development. Previous studies have shown that the addition of CaCO3(CC) leads to a modification of the calcium-deficient apatite structure of the reaction product, which results in a material more similar to the apatite in bone mineral. The addition of 10% w/w of CC to the initial DCP-alpha-TCP powder mixture resulted, with time, in a retardation of the development of compressive strength. However, the optimum compressive strength reached values up to 40% higher than CC-free samples. This retarding effect also has been monitored as a function of the calcium to phosphorus (Ca/P) ratio of the DCP and alpha-TCP mixture, showing the importance of the final cement properties of the relative quantities of the reactants in the mixture.