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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.
Latest research - Combination clasp