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Related Experiment Videos

Ion release from orthodontic appliances.

N Staffolani1, F Damiani, C Lilli

  • 1Institute of Clinical Odontology, University of Perugia, Italy.

Journal of Dentistry
|July 10, 1999
PubMed
Summary
This summary is machine-generated.

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Metal ion release from orthodontic appliances in acidic conditions is minimal. The study found that released nickel, copper, and chromium levels are below daily dietary intake, posing no safety concerns for patients.

Area of Science:

  • Biomaterials Science
  • Oral Biology
  • Materials Science

Background:

  • The oral cavity's microbiological and enzymatic environment may promote metal corrosion.
  • Orthodontic appliances are composed of various metal alloys, including stainless steel and nickel-titanium.

Purpose of the Study:

  • To assess the release of metal ions from a typical orthodontic appliance under simulated oral conditions.
  • To quantify the corrosion potential of orthodontic materials in acidic environments.

Main Methods:

  • Orthodontic appliances were immersed in inorganic and organic acid solutions simulating oral acidity.
  • Atomic absorption spectrophotometry was used to measure the release of nickel, chromium, copper, silver, and palladium.

Main Results:

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  • Nickel, chromium, and copper release decreased at higher pH levels (6.5 vs. 3.5).
  • Ion release in organic acids (pH 2.2-2.5) after 28 days was comparable to inorganic acids (pH 3.5), except for copper.
  • Silver and palladium release from the brazing alloy was negligible (approx. 0.2 µg after 28 days).

Conclusions:

  • Daily metal ion release from orthodontic appliances in acidic conditions is significantly lower than dietary intake.
  • The quantities of metal ions released are unlikely to be a cause for concern regarding appliance safety.