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Related Experiment Videos

Structure and surface of TiNi human implants.

P Fili1, J Lausmaa, J Musialek

  • 1Institute of Materials Science and Engineering, Technical University Ostrava, Czech Republic. filip@siu.edu

Biomaterials
|July 4, 2001
PubMed
Summary

The surface and bulk structure of TiNi implants remain stable after implantation. Passivation methods critically influence nickel release from these biomedical devices.

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Area of Science:

  • Biomaterials Science
  • Materials Science and Engineering
  • Surface Science

Background:

  • Titanium-Nickel (TiNi) alloys are widely used in biomedical implants due to their unique properties.
  • Understanding the surface and bulk structural integrity of TiNi implants after implantation is crucial for assessing their long-term performance and biocompatibility.
  • The potential for nickel ion release is a significant concern for nickel-containing alloys used in medical devices.

Purpose of the Study:

  • To characterize the surface and bulk structure of TiNi implants before and after implantation.
  • To compare the elemental composition and chemical states of TiNi surfaces under different preparation and post-implantation conditions.
  • To investigate the influence of passivation methods on the stability and potential nickel release from TiNi implants.

Main Methods:

  • Scanning Electron Microscopy (SEM) for surface topography and microstructure.
  • Transmission Electron Microscopy (TEM) for detailed bulk structure analysis.
  • X-ray Photoemission Spectroscopy (XPS) and Scanning Auger Microprobe Analysis (AES) for surface elemental composition and chemical state determination.

Main Results:

  • TiNi implants exhibited similar surface topography and microstructure to non-implanted controls after implantation.
  • The primary surface elements detected were Titanium (Ti), Oxygen (O), and Carbon (C), with trace amounts of Nickel (Ni) and other elements.
  • Titanium was primarily in the form of Titanium Dioxide (TiO2), while Nickel existed in its metallic form.
  • A notable difference in Ni peak intensity was observed between control/retrieved samples (low Ni) and sputter-cleaned/reoxidized samples (detectable Ni), highlighting the impact of surface treatment.
  • No significant alterations in the bulk structure or surface oxide of TiNi samples were observed during the investigated implantation periods.

Conclusions:

  • The bulk structure and surface oxide of TiNi implants demonstrate stability during the investigated implantation periods.
  • The method of surface passivation is a critical factor determining the extent of nickel release from TiNi implants.
  • Surface characterization techniques like XPS and AES are essential for evaluating elemental composition and potential ion release from biomedical implants.

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