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What is What is the type of wire formed by twisting five tempered wire over a common wire? and explain in detail?
Coaxial Archwire
Coaxial archwires are made of a central core wire of 0.006 inch diameter wire with 5 or 6 outer wires. 
These wires are more flexible and were very frequently used for initial alignment of the teeth before the advent of Ni-Ti wires.
Textbook of  Orthodontics Gurkeerat Singh 2nd ed pg no 335