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Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro
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Molybdenum - A biodegradable implant material for structural applications?

Christian Redlich1, Peter Quadbeck1, Michael Thieme2

  • 1Dresden Branch Lab, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Winterbergstraße 28, 01277 Dresden, Germany.

Acta Biomaterialia
|January 12, 2020
PubMed
Summary

Molybdenum shows promise as a new biodegradable metal for medical implants. Its controlled degradation in simulated body fluids suggests potential for cardiovascular and orthopedic applications.

Keywords:
BiocompatibilityBiodegradable metalCorrosionMechanical propertiesMolybdenum

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Area of Science:

  • Biomaterials Science
  • Corrosion Engineering
  • Materials Science

Background:

  • Biodegradable metals offer solutions for orthopedic and cardiovascular implants, addressing complications associated with permanent materials.
  • Current biodegradable materials face challenges in achieving a balance of strength, degradation rate, and MRI compatibility.
  • Molybdenum is explored as a novel candidate material for biodegradable implants.

Purpose of the Study:

  • To investigate the degradation behavior of high-purity molybdenum in simulated physiological environments.
  • To evaluate molybdenum's corrosion mechanisms and product formation for potential stent applications.
  • To assess methods for controlling and enhancing molybdenum's degradation rate.

Main Methods:

  • Simulated physiological salt solutions (Kokubo's SBF, NaCl) were used to test molybdenum degradation.
  • Potentiodynamic polarization and immersion mass loss tests were conducted.
  • Ion concentration measurements and surface analysis (REM/EDX) were employed.

Main Results:

  • Molybdenum exhibited gradual dissolution within a suitable range for stent applications.
  • Corrosion products were thin and non-passivating, with a discussed underlying mechanism.
  • Calcium phosphate formation in SBF reduced corrosion rates.
  • In-situ polarization enhanced corrosion rates, surpassing benchmarks for degradable stent materials.

Conclusions:

  • Molybdenum presents a positive profile as a biodegradable material alternative.
  • Its degradation characteristics align with requirements for cardiovascular and orthopedic implants.
  • Further research is warranted to optimize molybdenum for biodegradable implant applications.