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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
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NiTi superelastic orthodontic archwires with polyamide coating
L A Bravo1, A González de Cabañes, J M Manero
1Unidad Docente de Ortodoncia, Facultad de Odontología, Universidad de Murcia, Murcia, Spain.
Journal of Materials Science. Materials in Medicine
|October 25, 2013
Summary
Polyamide 11 coating on nickel-titanium (NiTi) orthodontic archwires significantly reduces wear and friction. This innovative coating also prevents corrosion and decreases nickel ion release by 85%.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Orthodontics
Background:
- Nickel-titanium (NiTi) alloys are widely used in orthodontics due to their unique properties.
- Concerns exist regarding NiTi corrosion and nickel ion release in the oral environment.
- Surface modification of NiTi archwires is crucial for enhancing biocompatibility and performance.
Purpose of the Study:
- To evaluate the effect of Polyamide 11 coating on the properties of NiTi orthodontic archwires.
- To assess the impact of coating on transformation temperatures and stresses.
- To investigate the reduction in wear, friction, and nickel ion release.
Main Methods:
- Twenty NiTi archwires (55.2% Ni, 44.8% Ti) were coated with Polyamide 11 using a dipping treatment.
- Transformation temperatures and stresses were measured to determine property alterations.
- Adhesive wear tests and corrosion studies were conducted to evaluate performance and biocompatibility.
Main Results:
- The Polyamide 11 coating did not significantly alter the transformation temperatures or stresses of the NiTi alloy.
- Polymer-coated wires exhibited substantially lower wear rates and dynamic friction coefficients compared to uncoated wires.
- Corrosion studies confirmed that the coating effectively seals the NiTi surface, reducing nickel ion release by an average of 85%.
Conclusions:
- Polyamide 11 is a suitable coating for NiTi orthodontic archwires, enhancing wear resistance and reducing friction.
- The coating provides a protective barrier, significantly mitigating corrosion and nickel ion release.
- This surface modification offers a promising approach to improve the safety and efficacy of orthodontic treatments.
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