title: Hydroxyapatite deposition by electrophoresis on titanium sheets with different surface finishing.
abstract: Hydroxyapatite coatings are commonly applied to metallic biomedical implants to accelerate osseointegration. These coatings, usually produced by plasma spray techniques, can be obtained by alternative processes, like biomimetic process, electrolytic deposition, or electrophoretic process as well. Electrophoretic deposition of hydroxyapatite exhibits several advantages like simplicity and low cost. In this article, titanium sheets with three different surface finishing were coated with hydroxyapatite by using electrophoresis. Surface treatments include: (1) abrading with SiC paper; (2) abrading with SiC paper plus electrolytic etch with H3PO4 solution; and (3) blasting with alumina powder followed by etch with a solution containing H2O2 and HF. Stoichiometric hydroxyapatite was used to coat titanium sheets. Blasted samples were also coated using a calcium-deficient hydroxyapatite. SEM, XRD, and FTIR were employed to characterize titanium substrates and coatings produced. Results show that electrophoretic process can produce a uniform thin layer, satisfactorily adhered, of hydroxyapatite on treated titanium samples. Furthermore, sintering at 800 degrees C do not promote the decomposition of calcium-deficient hydroxyapatite.
authors.affiliation: COPPE/UFRJ, P.O. Box 68505, Rio de Janeiro, 21941-970, RJ, Brazil.
authors.forename: Lídia
authors.initials: L
authors.lastname: Agata De Sena
authors.forename: Mônica
authors.initials: M
authors.lastname: Calixto De Andrade
authors.forename: Alexandre
authors.initials: A
authors.lastname: Malta Rossi
authors.forename: Gloria
authors.initials: G
authors.lastname: de Almeida Soares
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D004586:Electrophoresis; D008855:Microscopy, Electron, Scanning; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite; D014025:Titanium