File Download

There are no files associated with this item.

Supplementary

Conference Paper: Formation of CAPO4 and Suppression of Ni Leaching in Nitinol Using Oxygen and Sodium Plasma Immersion Ion Implantation

TitleFormation of CAPO4 and Suppression of Ni Leaching in Nitinol Using Oxygen and Sodium Plasma Immersion Ion Implantation
Authors
Issue Date2008
PublisherInternational Society of Orthopaedic Surgery and Traumatology.
Citation
SICOT/SIROT 2008 XXIV Triennial World Congress, Hong Kong, 24-28 August 2008, p. abstract no. 17044 How to Cite?
AbstractOrthopaedic applications of nitinol have been hampered by the high toxic nickel content. Our previous studies demonstrate oxygen plasma immersion ion implantation (PIII) can mitigate nickel leaching and enhance the corrosion resistance. However, the oxygen-implanted layer does not bond well to bones in vivo, thereby leading to potential mechanical failure at bone-implant interface. Sodium PIII may enhance the surface bioactivity of titanium and this study investigates the feasibility of apatite formation and enhancement of corrosion resistance of nitinol using combined Na and O PIII. Nitinol discs are implanted with oxygen plasma and some samples are subsequently treated by sodium plasma. The elemental depth profiles and chemical composition are determined by X-ray photoelectron spectroscopy, and the bioactivity and cytotoxicity are assessed by immersion tests in simulated body fluids and cell cultures respectively. The SEM and EDS spectra indicate the both treated surfaces can attract Ca and P deposition after SBF immersion. The amount of CaPO4 deposited on the Na-PIII surface is lower than that on the Na&O-PIII sample. The corrosion resistance of Na&O PIII sample increases about 3 folds as compared with the untreated nitinol. The cell attachment tests indicate the cells seeded onto both treated nitinol spread more and the number of osteoblasts attached on the Na&O-PIII sample is significantly higher than the untreated one. In our experiments, energetic Na ions are implanted, thereby changing the chemical composition and surface morphology of the substrate. In summary, it suggests these plasma treatments may contribute to the biological performance.
DescriptionSession: Basic science: bone healing and reconstruction
Oral presentation
Persistent Identifierhttp://hdl.handle.net/10722/61568

 

DC FieldValueLanguage
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorChan, YLen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorChan, Den_HK
dc.contributor.authorWu, SLen_HK
dc.contributor.authorLiu, XMen_HK
dc.contributor.authorChu, CLen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorCheung, KMCen_HK
dc.date.accessioned2010-07-13T03:42:35Z-
dc.date.available2010-07-13T03:42:35Z-
dc.date.issued2008en_HK
dc.identifier.citationSICOT/SIROT 2008 XXIV Triennial World Congress, Hong Kong, 24-28 August 2008, p. abstract no. 17044-
dc.identifier.urihttp://hdl.handle.net/10722/61568-
dc.descriptionSession: Basic science: bone healing and reconstructionen_HK
dc.descriptionOral presentation-
dc.description.abstractOrthopaedic applications of nitinol have been hampered by the high toxic nickel content. Our previous studies demonstrate oxygen plasma immersion ion implantation (PIII) can mitigate nickel leaching and enhance the corrosion resistance. However, the oxygen-implanted layer does not bond well to bones in vivo, thereby leading to potential mechanical failure at bone-implant interface. Sodium PIII may enhance the surface bioactivity of titanium and this study investigates the feasibility of apatite formation and enhancement of corrosion resistance of nitinol using combined Na and O PIII. Nitinol discs are implanted with oxygen plasma and some samples are subsequently treated by sodium plasma. The elemental depth profiles and chemical composition are determined by X-ray photoelectron spectroscopy, and the bioactivity and cytotoxicity are assessed by immersion tests in simulated body fluids and cell cultures respectively. The SEM and EDS spectra indicate the both treated surfaces can attract Ca and P deposition after SBF immersion. The amount of CaPO4 deposited on the Na-PIII surface is lower than that on the Na&O-PIII sample. The corrosion resistance of Na&O PIII sample increases about 3 folds as compared with the untreated nitinol. The cell attachment tests indicate the cells seeded onto both treated nitinol spread more and the number of osteoblasts attached on the Na&O-PIII sample is significantly higher than the untreated one. In our experiments, energetic Na ions are implanted, thereby changing the chemical composition and surface morphology of the substrate. In summary, it suggests these plasma treatments may contribute to the biological performance.-
dc.languageengen_HK
dc.publisherInternational Society of Orthopaedic Surgery and Traumatology.-
dc.relation.ispartofSICOT/SIROT World Congress-
dc.titleFormation of CAPO4 and Suppression of Ni Leaching in Nitinol Using Oxygen and Sodium Plasma Immersion Ion Implantationen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLu, WW: wwlu@hkusua.hku.hken_HK
dc.identifier.emailLuk, KDK: hrmoldk@hku.hken_HK
dc.identifier.emailChan, D: chand@hkucc.hku.hken_HK
dc.identifier.emailCheung, KMC: cheungmc@hku.hken_HK
dc.identifier.authorityLu, WW=rp00411en_HK
dc.identifier.authorityLuk, KDK=rp00333en_HK
dc.identifier.authorityChan, D=rp00540en_HK
dc.identifier.authorityCheung, KMC=rp00387en_HK
dc.identifier.hkuros166125en_HK
dc.identifier.hkuros166297-
dc.identifier.spageabstract no. 17044-
dc.identifier.epageabstract no. 17044-
dc.publisher.placeFrance-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats