Long Term retainers tend to be encouraged by orthodontists just after braces to circumvent your teeth from shifting again for their original place. NiTi or Stainless Steel wires are coated with Teflon/5META/Tooth coloured epoxy resins. 4 Coating materials are artificial resin or plastic resins such as epoxy resins.3 Coating increases waiting for link from Web 2.0 Blogs (1)