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FRICTION IN ORTHODONTICS

  • When sliding mechanics are used, friction occurs at the bracket-wire interface. Some of the applied force is therefore dissipated as friction, and the remainder is transferred to the supporting structures of the tooth to mediate tooth movement. Therefore, maximum biological tissue response occurs only when the applied force is of sufficient magnitude to adequately overcome friction and lie within the optimum range of forces necessary for movement of teeth.
  • Types of friction:
  • Force friction- between two solid surfaces.
  • Kinetic/ Sliding friction- between two moving surfaces.
  • Static/ Limiting friction- which opposes the slip between two surfaces at rest.
  • Rolling friction- when a body is rolling on a surface.

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