In the RPI clasp, what is the location of the distal proximal plate?

In the RPI clasp, what is the location of the distal proximal plate?

• A. On the distal side of the tooth and connected to the I-bar
• B. On the buccal surface only
• C. On the incisal edge
• D. On the occlusal surface

Answer: (A)

In an RPI clasp, the distal proximal plate is placed on the distal surface of the abutment tooth and is connected to the I-bar. This arrangement uses a small plate to engage the proximal undercut near the gingival margin, providing retention and guidance while keeping the rest on the mesial side to resist vertical seating and the I-bar to help resist dislodgement. Placing the plate on the distal aspect allows effective engagement of the proximal undercut without placing functional components on the incisal, occlusal, or buccal surfaces alone.

In an RPI clasp, the distal proximal plate is placed on the distal surface of the abutment tooth and is connected to the I-bar. This arrangement uses a small plate to engage the proximal undercut near the gingival margin, providing retention and guidance while keeping the rest on the mesial side to resist vertical seating and the I-bar to help resist dislodgement. Placing the plate on the distal aspect allows effective engagement of the proximal undercut without placing functional components on the incisal, occlusal, or buccal surfaces alone.