Prosthodontics (Fixed and Removable)
What the exam expects
Prosthodontics questions test your ability to plan restorations based on biomechanics, occlusion, and tissue support. You must understand crown and bridge design, the principles of removable partial denture (RPD) design, and complete denture fabrication.
Concepts to master
- Fixed prosthodontics: preparation taper (ideally 6 degrees), margin design, occlusal reduction, and the importance of a ferrule for endodontically treated teeth. Pontic design affects tissue health.
- Removable partial dentures: the major connector distributes load; rests provide support; clasps provide retention; the design should be rigid and avoid torque on abutments. The Kennedy classification describes the edentulous span.
- Complete dentures: support from the ridge, retention from border seal and saliva, stability from occlusion and polished surfaces. The neutral zone and balanced occlusion are key.
- Occlusion: centric relation versus maximum intercuspation; balanced occlusion in complete dentures reduces tipping forces.
Traps
A common trap is confusing support, retention, and stability. Another is misclassifying a Kennedy class when a modification space is present. Questions may also test whether a ferrule is present or absent, which changes the prognosis of a post-retained crown.
Worked rule of thumb
When evaluating an RPD design, check three things in order: support (rests on teeth), retention (clasps), and rigidity (major connector). If any is missing, the design is likely to fail.
Study strategy
Sketch Kennedy classes and label the components. For fixed prosthodontics, review preparation taper and ferrule rules, as these are high-yield and frequently tested.