Influence of Si substitution on the reactivity of alpha-tricalcium phosphate

Influence of Si substitution on the reactivity of alpha-tricalcium phosphate

Author Motisuke, Mariana Autor UNIFESP Google Scholar
Mestres, Gemma Google Scholar
Reno, Caroline O. Autor UNIFESP Google Scholar
Carrodeguas, Raul G. Google Scholar
Zavaglia, Cecilia A. C. Google Scholar
Ginebra, Maria-Pau Google Scholar
Abstract Silicon substituted calcium phosphates have been widely studied over the last ten years due to their enhanced osteogenic properties. Notwithstanding, the role of silicon on alpha-TCP reactivity is not clear yet. Therefore, the aim of this work was to evaluate the reactivity and the properties of Si-alpha-TCP in comparison to alpha-TCP. Precursor powders have similar properties regarding purity, particle size distribution and specific surface area, which allowed a better comparison of the Si effects on their reactivity and cements properties. Both Si-alpha-TCP and alpha-TCP hydrolyzed to a calcium-deficient hydroxyapatite when mixed with water but their conversion rates were different. Si-alpha-TCP exhibited a slower setting rate than alpha-TCP, i.e. k(SSA) for Si-TCP (0.021 g.m(-2).h(-1)) was almost four times lower than for alpha-TCP (0.072 g.m(-2).h(-1)). On the other hand, the compressive strength of the CPC resulting from fully reacted Si-alpha-TCP was significantly higher (12.80 +/- 0.38 MPa) than that of alpha-TCP (11.44 +/- 0.54 MPa), due to the smaller size of the entangled precipitated apatite crystals. (C) 2017 Published by Elsevier B.V.
Keywords alpha-Tricalcium phosphate
Calcium phosphate cement
Kinetics
Silicon
xmlui.dri2xhtml.METS-1.0.item-coverage Amsterdam
Language English
Sponsor Sao Paulo Research Foundation (FAPESP)
Spanish Government
Generalitat de Catalunya through the ICREA Academia Award
Ministry of Economy and Competitiveness of Spain
Grant number FAPESP: 2005/04746-0
Spanish Government: MAT2015-65601-R
Ministry of Economy and Competitiveness of Spain: MAT2013-48426-C2-1-R
Date 2017
Published in Materials Science & Engineering C-Materials For Biological Applications. Amsterdam, v. 75, p. 816-821, 2017.
ISSN 0928-4931 (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Bv
Extent 816-821
Origin http://dx.doi.org/10.1016/j.msec.2017.02.099
Access rights Closed access
Type Article
Web of Science ID WOS:000400720800094
URI https://repositorio.unifesp.br/handle/11600/54436

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