Bioactive glass-ceramic scaffolds by additive manufacturing and sinter-crystallization of fine glass powders

Wollastonite (CaSiO3)–diopside (CaMgSi2O6) glass-ceramic scaffolds have been successfully fabricated using two different additive manufacturing techniques: powder-based 3D printing (3DP) and digital light processing (DLP), coupled with the sinter-crystallization of glass powders with two different c...

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Bibliographic Details
Published in:Journal of materials research 2018-07, Vol.33 (14), p.1960-1971
Main Authors: Elsayed, Hamada, Zocca, Andrea, Schmidt, Johanna, Günster, Jens, Colombo, Paolo, Bernardo, Enrico
Format: Article
Language:English
Subjects:
Additive manufacturing
Applied and Technical Physics
Biocompatibility
Bioglass
Biological activity
Biomaterials
Biomedical materials
Body fluids
Bones
Calcium magnesium silicates
Ceramic powders
Ceramics
Crystallization
Diopside
Experiments
Fuel cells
Glass ceramics
Hydroxyapatite
In vitro methods and tests
Inorganic Chemistry
Low temperature
Manufacturing
Materials Engineering
Materials research
Materials Science
Microscopy
Nanotechnology
Nucleation
Polymers
Scaffolds
Silicon dioxide
Sintering
Sintering (powder metallurgy)
Surgical implants
Three dimensional printing
Tissue engineering
Viscous flow
Wollastonite
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Summary:Wollastonite (CaSiO3)–diopside (CaMgSi2O6) glass-ceramic scaffolds have been successfully fabricated using two different additive manufacturing techniques: powder-based 3D printing (3DP) and digital light processing (DLP), coupled with the sinter-crystallization of glass powders with two different compositions. The adopted manufacturing process depended on the balance between viscous flow sintering and crystallization of the glass particles, in turn influenced by the powder size and the sensitivity of CaO–MgO–SiO2 glasses to surface nucleation. 3DP used coarser glass powders and was more appropriate for low temperature firing (800–900 °C), leading to samples with limited crystallization. On the contrary, DLP used finer glass powders, leading to highly crystallized glass-ceramic samples. Despite the differences in manufacturing technology and crystallization, all samples featured very good strength-to-density ratios, which benefit their use for bone tissue engineering applications. The bioactivity of 3D-printed glass-ceramics after immersion in simulated body fluid and the similarities, in terms of ionic releases and hydroxyapatite formation with already validated bioactive glass-ceramics, were preliminarily assessed.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2018.120