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Properties of Orthodontic Wires

  • Material Scarcity, Abundance of Ideas (1750-1930)
  • noble metals
  • Gold, platinum, iridium and silver alloys
  • good corrosion resistance
  • acceptable esthetics
  • lacked the flexibility and tensile strength
  • If the shearing force is:-
  • Small – atoms slip, and return back to their original position (elastic deformation)
  • Beyond the elastic limit –
  • crystal suffers a slight deformation
  • permanent (plastic deformation)
  • Greater stress – fracture

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