エルジン
In the 1950s, cobalt-chromium alloy started being used in orthodontics. Rocky Mountain Orthodontics first started marketing the cobalt-chromium alloy as Elgiloy in the 1950s. It was the Elgin National Watch Company which introduced this alloy, composed of cobalt (40%), chromium (20%), iron (16%) and nickel (15%). Elgiloy offered increased resilience and strength, however, its stiffness was weak. These type of wires are still sold as alloys known as Remaloy, Forestaloy, Bioloy, Masel and Elgiloy. However, their use have decreased throughout the field of orthodontics due to the fact that no complex bends in wires are needed in today's treatment.