Removable Prosthodontics
Removable Prosthodontics tests whether you can design a partial denture that distributes load, protects abutments, and restores function without damaging remaining tissues. The board expects support, stability, and retention to be analyzed separately.
Core rules
- A removable partial denture is not merely a tooth replacement; it is a biomechanical device with rests, guide planes, minor connectors, and a major connector.
- Rest seats direct occlusal forces along the long axis of abutments.
- Clasp assemblies need reciprocation; a clasp without reciprocal elements can torque a tooth.
- Distal-extension bases need stress-reducing designs and accurate tissue support.
- Verify border extension, relief, and jaw relation records before processing.
Worked example
A mandibular Kennedy Class I patient has missing 36 and 46, with healthy 35 and 45 abutments. Reasoning: use a lingual bar major connector if adequate lingual space exists; place mesial rests on 35 and 45; use a stress-reducing direct retainer such as an RPI or equivalent design; extend bases to the retromolar pad and buccal shelf. Do not rely on clasps alone for support. The plan should include hygiene access and a post-insertion review.
Traps that cost marks
- Designing a partial denture without rest seats.
- Placing a clasp on a tilted tooth without evaluating reciprocal arm contact.
- Overextending or underextending the denture base.
- Ignoring free-end saddle movement.
- Skipping a try-in to verify borders and occlusion.