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Open AccessArticle

Bioactive Wollastonite-Diopside Foams from Preceramic Polymers and Reactive Oxide Fillers

Department of Industrial Engineering, University of Padova, Via Marzolo 9, Padova 35131, Italy
Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58/B, Padova 35131, Italy
Author to whom correspondence should be addressed.
Academic Editor: Andrew J. Ruys
Materials 2015, 8(5), 2480-2494;
Received: 9 April 2015 / Revised: 29 April 2015 / Accepted: 4 May 2015 / Published: 8 May 2015
(This article belongs to the Special Issue Bioceramics)
Wollastonite (CaSiO3) and diopside (CaMgSi2O6) silicate ceramics have been widely investigated as highly bioactive materials, suitable for bone tissue engineering applications. In the present paper, highly porous glass-ceramic foams, with both wollastonite and diopside as crystal phases, were developed from the thermal treatment of silicone polymers filled with CaO and MgO precursors, in the form of micro-sized particles. The foaming was due to water release, at low temperature, in the polymeric matrix before ceramic conversion, mainly operated by hydrated sodium phosphate, used as a secondary filler. This additive proved to be “multifunctional”, since it additionally favored the phase development, by the formation of a liquid phase upon firing, in turn promoting the ionic interdiffusion. The liquid phase was promoted also by the incorporation of powders of a glass crystallizing itself in wollastonite and diopside, with significant improvements in both structural integrity and crushing strength. The biological characterization of polymer-derived wollastonite-diopside foams, to assess the bioactivity of the samples, was performed by means of a cell culture test. The MTT assay and LDH activity tests gave positive results in terms of cell viability. View Full-Text
Keywords: polymer-derived ceramics; bioactivity; wollastonite; diopside; glass-ceramic polymer-derived ceramics; bioactivity; wollastonite; diopside; glass-ceramic
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Fiocco, L.; Elsayed, H.; Ferroni, L.; Gardin, C.; Zavan, B.; Bernardo, E. Bioactive Wollastonite-Diopside Foams from Preceramic Polymers and Reactive Oxide Fillers. Materials 2015, 8, 2480-2494.

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