Improvement of the mechanical properties of new calcium phosphate bone cements in the CaHPO4-alpha-Ca3(PO4)2 system: compressive strength and microstructural development.
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.
Fernández
E
E
Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya, Barcelona, Spain.
Gil
F J
FJ
Best
S M
SM
Ginebra
M P
MP
Driessens
F C
FC
Planell
J A
JA
D001843:Bone Cements / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry; D019245:Compressive Strength; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010316:Particle Size
D001843:Bone Cements; D002130:Calcium Phosphates