Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Motisuke, Mariana ; Mestres, Gemma ; Reno, Caroline O. ; Carrodeguas, Raul G. ; Zavaglia, Cecilia A. C. ; Ginebra, Maria-Pau
Total Authors: 6
Document type: Journal article
Source: Materials Science & Engineering C-Materials for Biological Applications; v. 75, p. 816-821, JUN 1 2017.
Web of Science Citations: 5

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. (AU)