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Microstructural and in vitro characterization of SiO2-Na2O-CaO-MgO glass-ceramic bioactive scaffolds for bone substitutes

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Abstract

In the present research work, the preparation and characterization of bioactive glass-ceramic scaffolds for bone substitutes are described. The scaffolds were prepared by starch consolidation of bioactive glass powders belonging to the SiO2-Na2O-CaO-MgO system using three different organic starches (corn, potatoes and rice) as reported in a previous screening process [1]. The scaffolds, characterized by scanning electron microscopy, showed a porous structure with highly interconnected pores. The pores sizes assessed by mercury intrusion porosimetry put in evidence the presence of pores of 50–100 μm. The structure of the scaffolds was investigated by X-ray diffraction and revealed the glass-ceramic nature of the obtained material. The mechanical properties of the scaffolds were evaluated by means of compressive tests on cubic samples and the obtained results demonstrated their good mechanical strength. The in vitro bioactivity of the scaffolds was tested by soaking them in a simulated body fluid (SBF) and by subsequently characterizing the soaked surfaces by SEM, EDS and X-ray diffraction. Good in vitro bioactivity was found for the starting glass and for the obtained scaffolds. Moreover, the scaffold bioresorption, tested by measuring the samples weight loss in SBF at different periods of time, showed a partial resorption of the scaffolds. Cell culture testing of the three different scaffolds indicated no differences in cell number and in alkaline phosphatase activity; the morphology of the osteoblasts showed good spreading, comparable to bulk material which was used as the control.

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Authors and Affiliations

  1. Materials Science and Chemical Engineering Department, Polytechnic of Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy

    C. Vitale-Brovarone, E. Vernè & P. Appendino

  2. Department of Medical Sciences, Human Anatomy, University of Eastern Piedmont, Novara, Italy

    M. Bosetti & M. Cannas

Authors
  1. C. Vitale-Brovarone
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  2. E. Vernè
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  3. M. Bosetti
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  4. P. Appendino
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  5. M. Cannas
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Correspondence to C. Vitale-Brovarone.

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Vitale-Brovarone, C., Vernè, E., Bosetti, M. et al. Microstructural and in vitro characterization of SiO2-Na2O-CaO-MgO glass-ceramic bioactive scaffolds for bone substitutes. J Mater Sci: Mater Med 16, 909–917 (2005). https://doi.org/10.1007/s10856-005-4425-0

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  • DOI: https://doi.org/10.1007/s10856-005-4425-0

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