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Metal release from heat-treated orthodontic archwires
1Department of Dental Materials, School of Dentistry, University of Bergen, Norway.
Acta Odontologica Scandinavica
|December 1, 1987
Summary
Heat treatment significantly increases metal release from orthodontic wires. Cobalt-chromium wires released more metals than stainless steel, especially after heat exposure above 500°C.
Area of Science:
- Biomaterials Science
- Orthodontics
- Corrosion Engineering
Background:
- Orthodontic archwires are crucial for tooth movement.
- Understanding material degradation, like metal ion release, is vital for patient safety.
- Heat treatment is sometimes used in orthodontic procedures.
Purpose of the Study:
- To evaluate the effect of heat treatment on metal ion release from stainless steel and cobalt-chromium orthodontic archwires.
- To compare the corrosion resistance of these materials under simulated oral conditions.
Main Methods:
- Immersion corrosion testing of as-received and heat-treated (1-min at various temperatures) archwires in artificial saliva.
- Analysis of released iron, cobalt, and nickel using appropriate analytical techniques after 1 week of immersion.
Main Results:
- Cobalt-chromium wires released more metals than stainless steel wires in the as-received state.
- Metal release from stainless steel significantly increased at temperatures ≥400°C.
- Metal release from cobalt-chromium wires increased notably at temperatures ≥500°C, becoming 15-60 times higher than baseline values at elevated temperatures.
Conclusions:
- Heat treatment protocols for orthodontic wires must consider the potential for increased metal ion release.
- Elevated temperatures can compromise the integrity of both stainless steel and cobalt-chromium orthodontic archwires, necessitating careful clinical application.