Abstract
ABSTRACTObjective: To investigate the effect of ZnO nanocoating on mechanical properties of NiTi orthodontic wires and antibacterial activity. Methods: 0.016 x 0.022-in NiTi orthodontic wires were coated with ZnO nanoparticles using an electrochemical deposition method with three electrodes system in 0.1M Zn(NO3)2. Mechanical properties and frictional resistance of the coated wires were investigated using an universal testing machine. Antibacterial effect of ZnO coating was also investigated.Results: A stable adhered ZnO nanocoating on NiTi wires was obtained. The coated wires have a significant antibacterial activity against S. aureus, S. pyogens and E. coli, and a reduction of frictional forces by 34%. Conclusion: ZnO nanocoating may improve the antibacterial effects of NiTi wires and reduce the frictional resistance. Coating may be implanted in orthodontic practice for faster and safer treatment.
Highlights
Nickel-titanium (NiTi) wires have unique properties compared with other types of wires
Scanning electron microscope of the ZnO nanoparticles coated wires demonstrated a homogenous layer of nanoparticles on the wire (Fig 2)
Inhibition zone was formed around all ZnO nanoparticles coated wires with all types of bacteria
Summary
Nickel-titanium (NiTi) wires have unique properties compared with other types of wires. NiTi wires can generate light forces in a large range of action, so they are considered to be the ideal orthodontic archwires for the initial stage of comprehensive orthodontic treatment. The ability of the wire to slide along the bracket is essential for proper alignment and leveling in this stage.[1] the main disadvantage of NiTi wires are surface roughness and high friction coefficient, which result in high frictional resistance.[1,2] higher orthodontic forces would be needed to overcome resistance to sliding and to achieve the desired tooth movement.[2,3] Such excessive forces can increase the treatment duration, raise the risk of anchorage loss, undesirable tooth movement and root resorption.[4,5]
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