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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


  • Grains à  microns to centimeters
  • Grain boundaries
  • Atoms are irregularly arranged, and this leads to a weaker amorphous type structure.
  • Alloy à combination of crystalline (grains) and amorphous (grain boundaries)
  • Decreased mechanical strength and reduced corrosion resistance

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