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Metal implants and surface reactions

S G Steinemann1

  • 1Institut de physique expérimentale de I'Université de Lausanne, Switzerland.

Injury
|January 1, 1996
PubMed
Summary

Metals in the body can corrode, causing tissue damage. However, titanium and tantalum resist corrosion, offering a favorable chemical interaction with tissues and reducing infection risk.

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Area of Science:

  • Biomaterials Science
  • Materials Science
  • Tissue Engineering

Background:

  • Metals implanted in living tissue are susceptible to corrosion.
  • This corrosion involves redox reactions, hydrolysis, and metal-organic complex formation.
  • Tissue denaturation is a consequence of metal corrosion, impacting biocompatibility.

Purpose of the Study:

  • To investigate the variable corrosion behaviors of different metals in biological environments.
  • To understand the chemical interactions between implantable metals and human tissues.
  • To evaluate the implications of metal corrosion on tissue health and infection susceptibility.

Main Methods:

  • Review of established principles of metal corrosion in biological settings.
  • Comparative analysis of the chemical reactivity of various metals, including gold, stainless steel, titanium, and tantalum.
  • Assessment of the impact of corrosion products on tissue denaturation and infection risk.

Main Results:

  • Most metals like gold and stainless steel undergo corrosion via redox reactions and hydrolysis.
  • Titanium and tantalum exhibit significantly lower corrosion rates and different interaction mechanisms.
  • The absence of chemical foreign body effects from titanium is linked to reduced tissue infection susceptibility.

Conclusions:

  • The chemical inertness of titanium and tantalum offers a significant advantage for medical implants.
  • Understanding metal-tissue interactions is crucial for designing biocompatible and infection-resistant biomaterials.
  • Titanium's favorable properties make it a preferred choice for minimizing adverse tissue reactions and infection risk.

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