Microstructure and Biocompatibility of Titanium Oxides Produced on Nitrided Surface Layer Under Glow Discharge Conditions

E. Czarnowska , J. Morgiel , Maciej Ossowski , R. Major , A. Sowinska , Slawomir T Wierzchon

Abstract

The disadvantages of titanium implants are their low wear resistance and the release of titanium elements into surrounding tissue. These can be eliminated by modifying the surface by surface engineering methods, among them nitriding under glow discharge conditions which allow to produce diffusive surface layers. Their combining with an oxide layer might be valuable for biological events occurring at the bone implant interface. The aim of this study was to enhance the titanium biomaterial performance via combining nitriding and oxidizing treatments in one process under glow discharge conditions. The oxynitrided surface layers were produced at 680 °C. The obtained layer was TiO+TiN+Ti2N+αTi(N) type and about 4-μm thick and was of diffusive character. This layer significantly increased wear resistance and slightly corrosion resistance compared to that of the reference titanium alloy. The produced titanium oxide was about 400-nm thick and built from fine crystallites. This oxide exhibits bioactivity in SBF (simulated body fluid). Osteoblasts of Saos-2 line incubated on this surface exhibited good adhesion and proliferation and ALP release comparable with cells cultured on the reference titanium alloy and TiN+Ti2N+αTi(N) surface layers. A quantitative analysis of blood platelets adhering to this layer revealed their highest amount in comparison to that on both the nitrided surface layer and titanium alloy. The presented study provided a simple and reproducible method of combining oxidizing and nitriding under glow discharge in one process. Experimental data in vitro suggests that titanium alloy oxynitriding under low temperatures at glow discharge conditions improves titanium alloy properties and biocompatibility and tissue healing. Therefore, the layer of TiO+TiN+Ti2N+αTi(N) type could be valuable for long-term bone implants.
Author E. Czarnowska - [Instytut Pomnik-Centrum Zdrowia Dziecka]
E. Czarnowska,,
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, J. Morgiel - [Instytut Metalurgii i Inzynierii Materialowej Polskiej Akademii Nauk]
J. Morgiel,,
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, Maciej Ossowski (FMSE / DSE)
Maciej Ossowski,,
- Division of Surface Engineering
, R. Major - [Instytut Metalurgii i Inzynierii Materialowej Polskiej Akademii Nauk]
R. Major,,
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, A. Sowinska - [Instytut Pomnik-Centrum Zdrowia Dziecka]
A. Sowinska,,
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, Slawomir T Wierzchon
Slawomir T Wierzchon,,
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Journal seriesJournal of Nanoscience and Nanotechnology, ISSN 1533-4880, (A 25 pkt)
Issue year2011
Vol11
No10
Pages8917-8923
Keywords in EnglishBiocompatibility, Microstructure, nitriding, Titanium Oxides
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science; 2204 Biomedical Engineering; 1600 General Chemistry; 1502 Bioengineering
DOIDOI:10.1166/jnn.2011.3474
Score (nominal)25
Score sourcejournalList
Publication indicators Scopus Citations = 17; WoS Citations = 16; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 0.689; WoS Impact Factor: 2011 = 1.563 (2) - 2011=1.574 (5)
Citation count*10 (2015-04-29)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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