In a basic cast circumferential clasp, which arm tapers?

In a basic cast circumferential clasp, which arm tapers?

• A. Reciprocating arm
• B. Wrought wire arm
• C. Retentive arm
• D. Akers clasp

Answer: (C)

The main idea is that retention in a basic cast circumferential clasp comes from the retentive arm engaging the tooth’s undercut. That arm is tapered toward its tip so it can slide into the undercut with a smooth seating and then bite more into the undercut as it flexes. The taper helps create a controlled, solid engagement without adding bulk or risking damage to the tooth, balancing how tightly the clasp holds and how easy it is to remove. The other arm in this design provides reciprocal action and is not the tapered retention component, and wrought wire differs from the cast approach, while Akers clasp refers to the overall clasp style. So the arm that tapers is the retentive arm.

The main idea is that retention in a basic cast circumferential clasp comes from the retentive arm engaging the tooth’s undercut. That arm is tapered toward its tip so it can slide into the undercut with a smooth seating and then bite more into the undercut as it flexes. The taper helps create a controlled, solid engagement without adding bulk or risking damage to the tooth, balancing how tightly the clasp holds and how easy it is to remove. The other arm in this design provides reciprocal action and is not the tapered retention component, and wrought wire differs from the cast approach, while Akers clasp refers to the overall clasp style. So the arm that tapers is the retentive arm.