Processing of ZrO2 scaffolds coated by glass-ceramic derived from 45S5 bioglass

Autor(es)

Stabile, Franco M. ^[1] ; Albano, Maria P. ^[1] ; Garrido, Liliana B. ^[1] ; Volzone, Cristina ^[1] ; De Oliveira, Paulo Tambasco ^[2] ; Rosa, Adalberto Luiz ^[2]

Afiliação do(s) autor(es)

^[1] CCT La Plata CONICET, Ctr Tecnol Recursos Minerales & Ceram CETMIC, CICPBA, CC 49 B1897ZCA MB Gonnet, Buenos Aires, DF - Argentina

^[2] Univ Sao Paulo FORP USP, Sch Dent Ribeirao Preto, BR-14040904 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 42, n. 3, p. 4507-4516, FEB 15 2016.
• Citações Web of Science: 6

Resumo

Three dimensional, highly porous, ZrO2 scaffolds coated by glass ceramic derived from 45S5 bioglass were fabricated. The surface reactivity of 45S5 in aqueous solution was investigated as a function of the immersion time. The influence of the solid loading on the Theological behavior of 45S5 aqueous slips with ammonium polyacrylate (NH(4)PA) was studied; besides the effect of poly(vinyl)alcohol (PVA) on the relative viscosity was determined. The structure and microstructure of uncoated and coated ZrO2 scaffolds were characterized. The high ionic exchange capability of 45S5 was demonstrated by the pH rise, the significant weight loss and the amorphous calcium phosphate nucleation, upon its immersion in aqueous solution. The addition of PVA did not affect the dispersion properties of the 45S5 powder, which were basically controlled by its negative surface charge. 30 wt% 45S5 slips with 4 wt% PVA exhibited a yield stress and an adequate viscosity in the low shear rate range, to produce a bioglass coating into the ZrO2 scaffold. The glass -ceramic coating was distributed along the strut surfaces, forming a thin film without altering the porosity and the strut thickness of the original ZrO2 scaffold structure. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 12/50949-4 - Progressão de culturas de células osteogênicas sobre cerâmicas bioativas a base de zircônia e fluorapatita
• Beneficiário: Paulo Tambasco de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular