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- Byon, Eungsun, et al.
(author)
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Electrochemical property and apatite formation of metal ion implanted titanium for medical implants
- 2005
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In: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972. ; 200:1-4, s. 1018-1021
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Journal article (peer-reviewed)abstract
- This work is concerned with the effects of Ca-ion implantation on the electrochemical behavior and biocompatibility of commercially pure Ti. The electrochemical behavior was tested by open-circuit potential transient and polarization experiments in Hanks' solution, and the biocompatibility was evaluated by soaking in simulated body fluid solution. The Ca-implanted Ti specimen showed more active electrochemical behavior than non-implanted specimen, and easier formation of apatite with good Ca / P ratio in the range of 1.38 and 1.60, revealing its potential as a bioactive material.
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| 2. |
- Kang, Byung-Soo, et al.
(author)
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Metal plasma immersion ion implantation and deposition (MePIIID) on screw-shaped titanium implant: The effects of ion source, ion dose and acceleration voltage on surface chemistry and morphology.
- 2011
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In: Medical Engineering & Physics. - : Elsevier BV. - 0951-8320 .- 1350-4533. ; 33:6, s. 730-738
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Journal article (peer-reviewed)abstract
- The present study investigated the effect of metal plasma immersion ion implantation and deposition (MePIIID) process parameters, i.e., plasma sources of magnesium and calcium, ion dose, and acceleration voltage on the surface chemistry and morphology of screw-type titanium implants that have been most widely used for osseointegrated implants. It is found that irrespective of plasma ion source, surface topography and roughness showed no differences at the nanometer level; that atom concentrations increased with ion dose but decreased with acceleration voltage. Data obtained from X-ray photoelectron spectroscopy and auger electron spectroscopy suggested that MePIIID process produces ‘intermixed’ layer of cathodic arc deposition and plasma immersion ion implantation. The MePIIID process may create desired bioactive surface chemistry of dental and orthopaedic implants by tailoring ion and plasma sources and thus enable investigations of the effect of the surface chemistry on bone response.
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| 3. |
- Sul, Young-Taeg, 1960, et al.
(author)
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The bone response of oxidized bioactive and non-bioactive titanium implants.
- 2005
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In: Biomaterials. - Guildford, Surrey : Elsevier BV. - 0142-9612 .- 1878-5905. ; 26:33, s. 6720-30
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Journal article (peer-reviewed)abstract
- A number of experimental and clinical data on so-called oxidized implants have reported promising outcomes. However, little is investigated on the role of the surface oxide properties and osseointegration mechanism of the oxidized implant. Sul [On the Bone Response to Oxidized Titanium Implants: The role of microporous structure and chemical composition of the surface oxide in enhanced osseointegration (thesis). Göteborg: Department of Biomaterials/Handicap Research, University of Göteborg, Sweden; 2002; Biomaterials 2003; 24: 3893-3907] recently proposed two action mechanisms of osseointegration of oxidized implants, i.e. mechanical interlocking through bone growth in pores/other surface irregularities (1) and biochemical bonding (2). The aim of the present study is two-fold: (i) investigating the role of the implant surface chemistry on bone responses; (ii) investigating the validity of the biochemical bonding theory of the oxidized, bioactive bone implants with specific implant surface chemistry. Two groups of oxidized implants were prepared using micro arc oxidation process and were then inserted in rabbit bone. One group consisted of magnesium ion incorporated implants (MgTiO implant), the other consisted of TiO2 stoichiometry implants (TiO implant). Surface oxide properties of the implants were characterized with various surface analytic techniques. After 6 weeks of follow up, the mean peak values of removal torque of Mg implants dominated significantly over TiO implants (p < or = 0.0001). Bonding failure generally occurred in the bone away from the bone to implant interface for the MgTiO implant and mainly occurred at the bone to implant interface for the TiO implant that consisted mainly of TiO2 chemistry and significantly rougher surface as compared to the MgTiO implant. Between bone and the Mg- incorporated implant surface, ionic movements and ion concentrations gradient were detected. The current in vivo experimental data may provide positive evidence for the surface chemistry-mediated biochemical bonding theory of oxidized bioactive implants. However, the present study does not rule out potential synergy effects of the oxide thickness, micro-porous structure, crystal structure and surface roughness on improvements of bone responses to oxidized bioactive implants.
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