Authors: S Pina P M C Torres J M F Ferreira
Publish Date: 2009/10/23
Volume: 21, Issue: 2, Pages: 431-438
Abstract
The influence of magnesium and strontiumsubstitutions on injectability and mechanical performance of brushiteforming αTCP cements has been evaluated in the present work The effects of Mg and Srsubstitutions on crystalline phase composition and lattice parameters were determined through quantitative Xray phase analysis and structural Rietveld refinement of the starting calcium phosphate powders and of the hardened cements A noticeable dependence of injectability on the liquidtopowder 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 036 ml g−1 the percentage of injectability was always higher and lower for Mgcontaining cements and for Srcontaining cements respectively while all the pastes could be fully injected for LPR 036 ml g−1 The hardened cements exhibited relatively high wet compressive strength values ~17–25 MPa being the Sr and Mgcontaining 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 boneThanks are due to CICECO for the support and to the Portuguese Foundation for Science and Technology for the fellowship grant of S Pina SFRH/BD/21761/2005 The first author is grateful to C Stabler from Institute of Mineralogie University of ErlangenNuremberg Germany for his valuable help
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