To avoid direct transmission of tipping and rotational forces to the abutment, we clasp next to the distal extension.

To avoid direct transmission of tipping and rotational forces to the abutment, we clasp next to the distal extension.

• A. Distal extension
• B. Mesial abutment
• C. Occlusal table
• D. Gingival margin

Answer: (A)

In a distal-extension removable partial denture, the free-end saddle tends to push the denture to rotate toward the edentulous area when loaded. Clasping the tooth right next to that distal extension places the retention where it can directly oppose that tipping moment, helping to resist the rotation and reduce the amount of tipping and rotational force that would be transmitted to the abutment teeth. The retention on the adjacent (distal) tooth helps convert some of the load into movement of the denture base rather than loading the abutment excessively. The other options aren’t retention locations for counteracting this specific lever action, so they don’t address the biomechanics of distal-extension design.

In a distal-extension removable partial denture, the free-end saddle tends to push the denture to rotate toward the edentulous area when loaded. Clasping the tooth right next to that distal extension places the retention where it can directly oppose that tipping moment, helping to resist the rotation and reduce the amount of tipping and rotational force that would be transmitted to the abutment teeth. The retention on the adjacent (distal) tooth helps convert some of the load into movement of the denture base rather than loading the abutment excessively. The other options aren’t retention locations for counteracting this specific lever action, so they don’t address the biomechanics of distal-extension design.