title: Preparation of bone-implants by coating hydroxyapatite nanoparticles on self-formed titanium dioxide thin-layers on titanium metal surfaces.
abstract: Preparation of hydroxyapatite coated custom-made metallic bone-implants is very important for the replacement of injured bones of the body. Furthermore, these bone-implants are more stable under the corrosive environment of the body and biocompatible than bone-implants made up of pure metals and metal alloys. Herein, we describe a novel, simple and low-cost technique to prepare biocompatible hydroxyapatite coated titanium metal (TiM) implants through growth of self-formed TiO2 thin-layer (SFTL) on TiM via a heat treatment process. SFTL acts as a surface binder of HA nanoparticles in order to produce HA coated implants. Colloidal HA nanorods prepared by a novel surfactant-assisted synthesis method, have been coated on SFTL via atomized spray pyrolysis (ASP) technique. The corrosion behavior of the bare and surface-modified TiM (SMTiM) in a simulated body fluid (SBF) medium is also studied. The highest corrosion rate is found to be for the bare TiM plate, but the corrosion rate has been reduced with the heat-treatment of TiM due to the formation of SFTL. The lowest corrosion rate is recorded for the implant prepared by heat treatment of TiM at 700 °C. The HA-coating further assists in the passivation of the TiM in the SBF medium. Both SMTiM and HA coated SMTiM are noncytotoxic against osteoblast-like (HOS) cells and are in high-bioactivity. The overall production process of bone-implant described in this paper is in high economic value.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: W P S L
authors.initials: WP
authors.lastname: Wijesinghe
authors.affiliation: Department of Chemistry, Faculty of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: M M M G P G
authors.initials: MM
authors.lastname: Mantilaka
authors.affiliation: Department of Chemistry, Faculty of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: K G
authors.initials: KG
authors.lastname: Chathuranga Senarathna
authors.affiliation: Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Department of Medical Laboratory Science, Faculty of Allied Health Sciences, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: H M T U
authors.initials: HM
authors.lastname: Herath
authors.affiliation: Department of Veterinary Pathobiology, Faculty of Veterinary Medicine, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: T N
authors.initials: TN
authors.lastname: Premachandra
authors.affiliation: Department of Chemistry, Faculty of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: C S K
authors.initials: CS
authors.lastname: Ranasinghe
authors.affiliation: Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Department of Veterinary Pathobiology, Faculty of Veterinary Medicine, University of Peradeniya, 20400 Peradeniya, Sri Lanka.
authors.forename: R P V J
authors.initials: RP
authors.lastname: Rajapakse
authors.affiliation: Department of Chemistry, Faculty of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka; Postgraduate Institute of Science, University of Peradeniya, 20400 Peradeniya, Sri Lanka. Electronic address: rmgr@pdn.ac.lk.
authors.forename: R M G
authors.initials: RM
authors.lastname: Rajapakse
authors.affiliation: Department of Mechanical Engineering, University College London, London WC1E 7JE, UK.
authors.forename: Mohan
authors.initials: M
authors.lastname: Edirisinghe
authors.affiliation: Department of Mechanical Engineering, University College London, London WC1E 7JE, UK.
authors.forename: S
authors.initials: S
authors.lastname: Mahalingam
authors.affiliation: School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, 2 George Street, Brisbane 4001, QLD, Australia.
authors.forename: I M C C D
authors.initials: IM
authors.lastname: Bandara
authors.affiliation: Central Analytical Research Facility, Institute of Future Environments, Queensland University of Technology, 2 George Street, Brisbane 4001, QLD, Australia.
authors.forename: Sanjleena
authors.initials: S
authors.lastname: Singh
mesh_terms: D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000494:pharmacology; D017886:Durapatite / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; C009495:titanium dioxide; D017886:Durapatite; D014025:Titanium
keywords: Atomized spray pyrolysis; Corrosion; Hydroxyapatite coatings; TiO(2) thin layer; Titanium metal implants