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.
Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya, Barcelona, Spain.
E
E
Fernández
F J
FJ
Gil
S M
SM
Best
M P
MP
Ginebra
F C
FC
Driessens
J A
JA
Planell
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