Prosthodontics & Occlusion · single question

For a Kennedy Class I case requiring a distal-extension base, which type of retentive clasp design is generally preferred on the abutment adjacent to the saddle to minimize torquing forces on that tooth?

A rigid circumferential (Akers) clasp engaging an undercut close to the saddle
An RPI system or I-bar/wrought-wire clasp design that provides more flexible, stress-releasing retention
No clasp at all on that abutment
A fixed bridge replacing that abutment instead

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Correct answer: B. An RPI system or I-bar/wrought-wire clasp design that provides more flexible, stress-releasing retention

Because distal-extension bases place rotational/torquing forces on the adjacent (terminal) abutment as the saddle moves under load, a stress-releasing design (such as the RPI system, or an I-bar clasp) is generally preferred over a rigid circumferential clasp, which would transmit more direct torque to that tooth.

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For a Kennedy Class I case requiring a distal-extension base, which type of retentive clasp design is generally preferred on the abutment adjacent to the saddle to minimize torquing forces on that tooth?

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