CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
artículos
Título:
Comparison of different fluorapatite dip coated layers on porous zirconia tapes
Autor/es:
MARIA P. ALBANO; LILIANA B. GARRIDO; LUCAS NOVAES TEIXEIRA; ADALBERTO LUIZ ROSA; PAULO TAMBASCO DE OLIVEIRA
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 40 p. 12509 - 12517
ISSN:
0272-8842
Resumen:
Fluorapatite (FA) layers with different thickness and microstructures on
porous 3 mol% yttria-partially stabilized zirconia (Y-PSZ) substrates
have been fabricated by dipping porous zirconia tapes into aqueous
fluorapatite slurries. Porous ZrO2 tapes were developed using
starch and an acrylic latex as fugitive additive and binder,
respectively. Two different binders, poly(vinyl)alcohol (PVA) and latex
were used to prepare the fluorapatite dip coating slips. The influence
of the suspension properties and the porous structure of the tape
surfaces (top and bottom) on the formation rate and consequently on the
layer thickness formed on each surface were studied. In addition, the
microstructure of the layers produced by using the different dip-coating
slips were compared and the osteoblastic cellular response to the
different FA coating layers was examined. A greater initial thickness of
the layer adhered was found for the tapes dip coated in the FA slip
with latex; for immersion times>0, the casting rate was observed to
be strongly influenced by both the structure of the tape surfaces and
the suspension properties. For both FA slurries, the casting rate at the
top surface of the tapes was greater than that at the bottom surface.
Sintered layers with thickness 8?9 times greater on both tape surfaces
were found using the dip coating slip with latex. For each tape surface,
the casting rate was accelerated and the layer shrink during sintering
was reduced by using the dip coating slip with latex. The coating layer
produced with latex enhanced the osteogenic potential of osteoblastic
cells in vitro, which is ultimately an indication of the material׳s
capacity to promote bone repair in vivo.