The materials that allow these to spring make them liable to breaking conveniently. Titanal or Orothonol lead for the relatively superior fortification on the wires. The composition in the wire has 55% Nickel and forty five% Titanium. The very first nickel-titanium orthodontic wire alloy was marketed from the Unitek Corporation https://bookmarkity.com/story19075237/little-known-facts-about-round-niti-wires