Title:Nafion/ZrO2 Modified NiTi Orthodontic Wire: Preparation, Material Characterization, and Corrosion Studies
Volume: 16
Issue: 3
Author(s): Raja Rajamanikkam San Chitta Raj, Keerthana Madhivanan, Dhanraj Ganapathy and Ashok K. Sundramoorthy*
Affiliation:
- Centre for Nano-Biosensors, Department of Prosthodontics and Materials Science, Saveetha Dental College and
Hospitals, Saveetha Institute of Medical and Technical Sciences, Chennai, 600077, Tamil Nadu, India
Keywords:
ZrO2/Nafion, NiTi orthodontic wire, stability, corrosion resistance, polarisation test, Nafion coating.
Abstract:
Background: Nickel-titanium (NiTi) orthodontic wires are widely used in dental corrective
procedures due to their high mechanical properties and cost-effectiveness. However, they are
prone to oral corrosion, leading to mechanical deterioration, aesthetic issues, and potential health
concerns.
Objective: This study aims to improve the corrosion resistance and durability of NiTi orthodontic
wires by employing zirconium dioxide (ZrO2) and Nafion coating with the goal of enhancing wire
performance.
Methods: Two types of NiTi wires were evaluated: a standard, unmodified wire as a control and another
wire treated with electrodeposited ZrO2 film and Nafion (Naf) coating. Surface analysis was
conducted using various techniques, including Field Emission Scanning Electron Microscopy (FESEM)
and Energy Dispersive X-ray Spectroscopy (EDX) analysis.
Results: The uncoated NiTi wire exhibited a corrosion rate of 4.436× 10-1 mm/year, whereas the
NAF/ZrO2-coated NiTi wire showed a corrosion rate of 4.068× 10-1 mm/year, indicating that the
NAF/ZrO2 coating acted as a protective layer. Additionally, the ZrO2 layer provided poor electrical
conductivity, resulting in slightly higher impedance compared to bare NiTi. The coating served as a
barrier, which significantly enhanced corrosion resistance and improved the wire lifespan.
Conclusion: Electro-modification through ZrO2 deposition and Nafion coating significantly improved
the corrosion resistance and overall durability of NiTi orthodontic wires, offering a promising
advancement for their use in dental orthodontics. This study underscores the potential of ZrO2
and Nafion coating to enhance the corrosion resistance and longevity of NiTi orthodontic wires.