The subject of wire-bracket angles is the basis for the application of force systems in orthodontics. Force systems will be formed as a result of the wire-bracket angles created when the archwire is inserted into the bracket slots. Different wire-bracket angles will produce a different force system. After the introduction of the straight wire technique in orthodontics one term has become significant - it was defined as Deviation Angle or Wire Play (or Clearance). It is a rotation movement (