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Related Experiment Videos

[In vitro metal dissolution under various extraction conditions].

H Doi1, S Takeda

  • 1Department of Biomaterials, Osaka Dental University.

Shika Zairyo, Kikai = Journal of the Japanese Society for Dental Materials and Devices
|May 1, 1990
PubMed
Summary

Dynamic conditions and longer extraction periods increase metal component dissolution, especially nickel, from medical alloys like NiTi and stainless steel. This highlights the importance of dynamic testing for evaluating implant material degradation.

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Area of Science:

  • Materials Science
  • Biocompatibility
  • Corrosion Engineering

Context:

  • Metallic biomaterials, including pure nickel (Ni), pure titanium (Ti), NiTi alloys, and 316 L stainless steel, are crucial for medical and dental applications.
  • Understanding the corrosion behavior and component dissolution of these materials is essential for ensuring their long-term safety and efficacy in physiological environments.
  • Dynamic conditions, pH variations, extraction duration, and filtration significantly influence the degradation pathways of metallic implants.

Purpose:

  • To investigate the dissolution of components from pure Ni, pure Ti, NiTi alloy, and 316 L stainless steel under various conditions.
  • To evaluate the effects of dynamic conditions (gyrating), pH (3.5, 7.0, 9.5), extraction period (3 and 7 days), and filtration on metal ion release.
  • To determine the forms (soluble vs. particulate) of released metals, particularly nickel, and assess the suitability of dynamic extraction for simulating in-vivo degradation.

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Summary:

  • Component dissolution was significantly higher under dynamic (160-230 rpm) than static conditions, and increased with longer extraction periods.
  • Nickel dissolution was most pronounced at pH 3.5 from pure Ni, NiTi alloy, and 316 L stainless steel, with both soluble and particulate forms detected.
  • Filtration (0.22 micron) reduced the measured metal content, and titanium was not detected in the filtrate under tested conditions.

Impact:

  • Dynamic extraction methods are more effective than static methods for simulating and evaluating the degradation of metallic materials intended for medical and dental use.
  • The findings provide critical insights into the release mechanisms of potentially harmful metal ions, informing the design and selection of safer biomaterials.
  • Understanding nickel release is particularly important due to its known allergenic potential, guiding the development of hypoallergenic implant materials.