resumo
This work deals with the fabrication by robocasting of 3D porous scaffolds of an alkali-free bioactive glass composition, FastOs (R) BG, belonging to the diopside (CaMgSi2O6)-fluorapatite (Ca-5(PO4)(3)F)-tricalcium phosphate (Ca-3(PO4)(2)) system. A glass frit prepared by melt quenching was grinded by dry and wet milling up to getting a suitable combination of particle sizes. The milled frit was then dispersed in aqueous media with the addition of a polycarbonate dispersant, hydroxypropyl methylcellulose (HPMC) as binder and Aristoflex (R) TAC as gelation agent. The effects of the type and amounts of the processing additives and particle size distribution on the rheological properties of the extrudable pastes were investigated. Printable inks containing 47 vol.% solids with rheological properties tuned to meet the stringent requirements of robocasting technique were obtained. Scaffolds with totally interconnected 3D pore networks and different pore sizes (200, 300 and 500 mu m) could be easily fabricated and sintered. The excellent processing and sintering ability resulted in compressive strength values comparable to that of cancellous bone essential for 3D porous scaffolds intended for bone regeneration and tissue engineering applications.
palavras-chave
CALCIUM-PHOSPHATE SCAFFOLDS; MECHANICAL-PROPERTIES; CERAMIC SCAFFOLDS; PARTICLE-PACKING; IN-VITRO; TISSUE; SUSPENSIONS; RHEOLOGY; BIOCERAMICS; SIZE
categoria
Materials Science
autores
Olhero, SM; Fernandes, HR; Marques, CF; Silva, BCG; Ferreira, JMF
nossos autores
Catarina Fernandes Marques
Estudante de doutoramento
Hugo Alexandre Gonçalves da Rocha Fernandes
Investigador Júnior
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Susana Maria Henriques Olhero
Professor AuxiliarGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
This work was developed in the scope of the CICECO-Aveiro Institute of Materials and funded by FEDERfunds through the Operational Programme Competitiveness Factors (COMPETE 2020) and the Portuguese Foundation for Science and Technology (FCT). C. Marques and Hugo R. Fernandes are grateful for the FCT Grants SFRH/BD/78355/2011 and SFRH/BPD/110883/2015, respectively. S. Olhero would like to thank FCT financing from IF/00951/2014.