A cast circumferential clasp is a ______ clasp.

A cast circumferential clasp is a ______ clasp.

• A. Infrabulge clasp
• B. Suprabulge clasp
• C. Circumferential clasp
• D. Akers clasp

Answer: (B)

A cast circumferential clasp fits the suprabulge category. Clasps are classified by where they engage the tooth’s undercut relative to the height of contour. Suprabulge clasps capture an undercut above this height, and a cast circumferential clasp encircles the tooth to engage that coronal undercut. So, even though a cast circumferential clasp can be a type like Akers clasp, its defining placement—engaging an undercut above the height of contour—places it in the suprabulge group. Infrabulge clasps, by contrast, engage undercuts below the height of contour.

A cast circumferential clasp fits the suprabulge category. Clasps are classified by where they engage the tooth’s undercut relative to the height of contour. Suprabulge clasps capture an undercut above this height, and a cast circumferential clasp encircles the tooth to engage that coronal undercut. So, even though a cast circumferential clasp can be a type like Akers clasp, its defining placement—engaging an undercut above the height of contour—places it in the suprabulge group. Infrabulge clasps, by contrast, engage undercuts below the height of contour.