Deposition of ZnO Nano Particles on Stainless Steel Orthodontic Wires by Chemical Solution Method for Friction Reduction Propose

In this paper, we report deposition of ZnO nanoparticles on stainless steel orthodontic wires by chemical solution method for the first time. The prepared samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive x-ray analysis (EDX), visibleultraviolet diffuse reflectance spectroscopy (DRS) and transmission electron microscope (TEM) to evaluate particle structure, size distribution and composition. ZnO nanoparticles are almost hexagonal (spherical) in shape. The mean particles size of them is 40-45 nm. Coating of SS wires with ZnO nanoparticles has effect in decreasing of frictional forces which is an important problem in orthodontic treatments. Amount of friction force between rectangular SS wires and orthodontic brackets showed 51% decrease in zno coated group relative to non coated group of wires .Also after deposition of nano zno on round SS wires 39% decrease in friction force was observed. ZnO nano particles play as a significant solid lubricant between orthodontic brackets and wires.