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RETRACTION BY FRICTIONAL MECHANICS

    • Defined as the rotational tendency when force is applied away from the center of resistance
    • A force acting at  a distance
    • Mathematically given as M = f x d
    • Where M is the moment F is the force
    • And D is the perpendicular distance of the line of action to the center of resistance
  • Closing loop arch wires should be fabricated
  • from rectangular wire to prevent wire from rooling
  • in the bracket slot
  • The performance of the loop,from the perspective
  • of engineering theory,is determined by 4 major
  • characteristics
  • Spring properties
  • Moment it generates
  • Its location
  • Additional design principle

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