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Structural, mechanical, and in vitro characterization of freeze-cast scaffolds prepared using a sol-gel-derived bioactive glass from the SiO2–CaO–Na2O–P2O5–K2O–MgO system

2022; Elsevier BV; Volume: 49; Issue: 2 Linguagem: Inglês

10.1016/j.ceramint.2022.09.185

1873-3956

Francisco B. Fantecelle, Diogo M.M. dos Santos, Breno Rocha Barrioni, Marivalda M. Pereira, Himad Ahmed Alcamand, Miguel L. Lapér, Manuel Houmard, Eduardo H.M. Nunes,

Additive Manufacturing and 3D Printing Technologies

This work deals with the preparation of freeze-cast scaffolds using a bioactive glass from the SiO2–CaO–Na2O–P2O5–K2O–MgO system. This material could be sintered at lower temperatures (650 °C) than other variations of bioactive glasses, which is an important advantage in terms of energy and cost savings. This behavior represents a great advantage in terms of energy and cost savings. The freeze-casting step was conducted using water as a solvent and liquid nitrogen as a coolant. The prepared samples were examined according to their pore structure, thermal behavior, mechanical stability, and bioactivity. The glass transition temperature (Tg), crystallization onset temperature (Tx), and maximum crystallization temperature (Tc) evaluated for this bioactive glass were about 660 °C, 690 °C, and 705 °C. Consequently, the freeze-cast scaffolds could be sintered at 650 °C for 2–8 h, which favored viscous flow sintering without crystallization. Bioactivity assays were conducted by soaking the scaffolds in simulated body fluid for up to 21 days, showing that these materials present a bioactive behavior, inducing hydroxyapatite formation. These materials' mechanical properties and biocompatibility make them promising candidates for use in trabecular bone repair.