Injectability of brushite-forming Mg-substituted and Sr-substituted alpha-TCP bone cements
authors Pina, S; Torres, PMC; Ferreira, JMF
nationality International
journal JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
keywords CALCIUM-PHOSPHATE CEMENT; BETA-TRICALCIUM PHOSPHATE; TO-POWDER RATIO; CRYSTAL-STRUCTURE; RHEOLOGICAL PROPERTIES; STRENGTH IMPROVEMENT; HYPODERMIC INJECTION; IONIC MODIFICATION; DEFICIENT APATITE; MAGNESIUM
abstract The influence of magnesium- and strontium-substitutions on injectability and mechanical performance of brushite-forming alpha-TCP cements has been evaluated in the present work. The effects of Mg- and Sr-substitutions on crystalline phase composition and lattice parameters were determined through quantitative X-ray phase analysis and structural Rietveld refinement of the starting calcium phosphate powders and of the hardened cements. A noticeable dependence of injectability on the liquid-to-powder ratio (LPR), smooth plots of extrusion force versus syringe plunger displacement and the absence of filter pressing effects were observed. For LPR values up to 0.36 ml g(-1), the percentage of injectability was always higher and lower for Mg-containing cements and for Sr-containing cements, respectively, while all the pastes could be fully injected for LPR > 0.36 ml g(-1). The hardened cements exhibited relatively high wet compressive strength values (similar to 17-25 MPa) being the Sr- and Mg-containing cements the strongest and the weakest, respectively, holding an interesting promise for uses in trauma surgery such as for filling bone defects and in minimally invasive techniques such as percutaneous vertebroplasty to fill lesions and strengthen the osteoporotic bone.
publisher SPRINGER
issn 0957-4530
year published 2010
volume 21
issue 2
beginning page 431
ending page 438
digital object identifier (doi) 10.1007/s10856-009-3890-2
web of science category Engineering, Biomedical; Materials Science, Biomaterials
subject category Engineering; Materials Science
unique article identifier WOS:000274436300006
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journal impact factor 2.448
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