Introduction to Removable Partial Denture (High-yield)
RPD: definition + goals
| Item | High-yield |
|---|---|
| Definition | Removable prosthesis replacing ≥1 missing teeth in a partially edentulous arch |
| Goals | Function, esthetics, preserve remaining teeth/tissues |
RPD biomechanics (must-know)
| Concept | Definition |
|---|---|
| Support | resists forces toward tissues |
| Stability | resists horizontal/rotational movement |
| Retention | resists displacement away from tissues |
Consequences of tooth loss (exam-focused)
| Domain | Key points |
|---|---|
| Diet/mastication | ↓ masticatory efficiency → diet modification |
| Aesthetics | loss of lip/cheek support; ↓ vertical dimension |
| Phonetics | altered speech (loss of tooth contact points) |
| Occlusion/TMJ | occlusal changes → interferences/premature contacts → may contribute to TMD |
| Bone | alveolar ridge resorption after extraction (rapid early remodeling; then slower ongoing) |
Clinical pearl
Denture bases should extend to maximum anatomical landmarks (e.g., retromolar pads) to distribute load and help limit accelerated resorption.
Phonetics: tooth-related sound categories
| Category | Examples |
|---|---|
| Labial | p, b, f, v, m |
| Dental | t, d, θ, ð, n |
| Palatal/Velar | k, g, x, ɣ, ŋ |
Reasons for tooth loss (list)
| Causes |
|---|
| Congenital absence • caries • periodontal disease • trauma • oral/maxillofacial surgery (incl. oncology) |
Congenitally missing teeth (definitions)
| Term | Definition |
|---|---|
| Hypodontia | 1–6 missing teeth |
| Oligodontia | >6 missing teeth |
| Anodontia | complete absence of teeth |
Combination syndrome (Kelly’s syndrome)
Classic setting + key changes
| Item | High-yield |
|---|---|
| Typical setting | Maxillary complete denture opposing mandibular RPD / mandibular anterior teeth |
| Key changes | anterior maxillary ridge resorption • tuberosity overgrowth • extrusion of mandibular anteriors • posterior ridge resorption under RPD bases • ↓ prosthetic space |
Management pearl
Replace posterior mandibular support and aim for bilateral balanced occlusion to reduce destabilizing anterior loading of the maxillary denture.
Fixed vs removable: selection (high-yield tables)
FPD: common contraindications
| Contraindication | Why it matters |
|---|---|
| Young age (<18) | growth not complete |
| Poor dexterity / hygiene | hygiene under pontics difficult |
| Long span | biomechanics/unfavorable leverage |
| High caries risk / uncontrolled perio | poor prognosis |
| Significant tissue loss | fixed can’t replace lost ridge/lip support like a flange |
Ante’s law (definition)
| Rule |
|---|
| Abutment root surface area should be ≥ that of teeth replaced |
RPD: common indications
| Indication | Key rationale |
|---|---|
| Long-span edentulous areas | fixed often unfavorable |
| Distal extension (no distal abutment) | avoids distal cantilever risks |
| Reduced periodontal support | may distribute loads differently vs fixed |
| Need cross-arch stabilization | removable framework can provide |
| Excessive ridge/bone loss | can replace teeth + tissue contour |
| Limited dexterity | may be more maintainable than fixed hygiene demands |
Interim vs definitive RPD (quick compare)
| Feature | Interim RPD | Definitive RPD |
|---|---|---|
| Purpose | temporary function/esthetics during healing or expected tooth loss | long-term rehabilitation |
| Pros | simple, easy to add/repair | better stability/retention, better load distribution, higher esthetics |
| Cons | poorer retention/longevity; may damage tissues if ill-fitting | complex planning/execution; can damage abutments if poorly designed; higher cost |