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Proceedings Paper

Composites PVDF-TrFE/BT used as bioactive membranes for enhancing bone regeneration
Author(s): Rossano Gimenes; Maria Ap. Zaghete; Marcio Bertolini; Jose Arana Varela; Luciane O. Coelho; Nelson F. Silva Jr.
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Paper Abstract

In this paper a piezoelectric composite membranes were developed for charge generator to promoter bone regeneration on defects sites. Is known that the osteogenesis process is induced by interactions between biological mechanisms and electrical phenomena. The membranes were prepared by mixing Barium Titanate (BT) powders and PVDF-TrFE (PVDF:TrFE = 60:40 mol%) on dimethylformamide medium. This precursor solution was dried and crystallized at 100oC for 12 hours. Composites membranes were obtained by following methods: solvent casting (SC), spincoating (SP), solvent extraction by water addition (WS) and hot pressing (HP). The microstructural analysis performed by SEM showed connectivity type 3-0 and 3-1 with high homogeneity for samples of ceramic volume fraction major than 0.50. Powder agglomerates within the polymer matrix was evidenced were observed for composites with the BT volume fraction major than 40%. The composite of ceramic fraction of 0.55 presented the best values of remanent polarization (~33mC/cm2), but the flexibility of these composites with the larger ceramic fraction was significantly affected. For in vivo evaluation PVDF-TrFE/BT 90/10 membranes with 3cm larger were longitudinally implanted under tibiae of male rabbit. After 21 days the animals were sacrificed. By histological analyses were observed neo formed bone with a high mitotic activity. In the interface bone-membrane was evidenced a pronounced callus formation. These results encourage further applications of these membranes in bone-repair process.

Paper Details

Date Published: 27 July 2004
PDF: 9 pages
Proc. SPIE 5385, Smart Structures and Materials 2004: Electroactive Polymer Actuators and Devices (EAPAD), (27 July 2004); doi: 10.1117/12.548647
Show Author Affiliations
Rossano Gimenes, Univ. Estadual Paulista (Brazil)
Maria Ap. Zaghete, Univ. Estadual Paulista (Brazil)
Marcio Bertolini, Univ. Estadual Paulista (Brazil)
Jose Arana Varela, Univ. Estadual Paulista (Brazil)
Luciane O. Coelho, Univ. Estadual Paulista (Brazil)
Nelson F. Silva Jr., Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 5385:
Smart Structures and Materials 2004: Electroactive Polymer Actuators and Devices (EAPAD)
Yoseph Bar-Cohen, Editor(s)

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