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Combination clasp

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  • A cast circumferential clasp cannot be used when an undercut is adjacent to the edentulous space, as it will produce destructive rotatory forces on the distal abutment.
  • In such cases, a flexible wrought wire retentive arm is used to replace the rigid cast alloy retentive arm. These clasps are called combination clasps as they combine the two.
  • As it has a greater flexibility it can be placed in a deeper undercut without any hazard to the abutment.
  • It is used in maxillary canines and premolars due to its superior aesthetics.

The round configuration of the wrought wire gives two advantages

  • It has a thin line contact, which collects less debris and is easy to maintain.
  • It can flex in all planes.
  • Tedious lab procedures.
  • Easily breaks or distorts.
  • Poor stability.

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