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FPD — Tooth Preparation & Pontics

Prosthodontics • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Ante's law guides abutment selection.
  • Modified ridge lap = most hygienic esthetic pontic.
  • Sanitary pontic = posterior mandible.
  • Shoulder finish line = all-ceramic; chamfer = metal/PFM.
  • ~6° taper for retention and resistance form.

FPD — Tooth Preparation & Pontics

Abutment Selection

Ante's law: the combined root surface area of the abutment teeth should be equal to or greater than that of the teeth being replaced by pontics. Violating it risks abutment overload.

Finish Lines

  • Chamfer — ideal for metal/PFM margins.
  • Shoulder — for all-ceramic, gives bulk for esthetics.
  • Knife-edge/feather — conservative but poorly defined; avoided for ceramics.

Pontic Designs

  • Modified ridge lap — most hygienic esthetic pontic; ideal for the posterior maxilla / esthetic zone (tissue contact only on the buccal).
  • Sanitary (hygienic) pontic — no tissue contact; used in the posterior mandible (non-esthetic).
  • Ovate — most esthetic, needs a prepared ridge.

Principles of Preparation

Adequate but conservative reduction, ~6° total occlusal convergence (taper) for retention, rounded internal line angles, and a smooth finish line.

Exam Tips ⭐

Ante's law for abutment surface area; modified ridge lap = most hygienic esthetic pontic; sanitary pontic = posterior mandible.

📝 Practice MCQs — FPD — Tooth Preparation & Pontics

Q1. Ante's law relates to the:
A. Taper of preparation
B. Root surface area of abutments vs pontics
C. Pontic shape
D. Occlusal clearance
Show Answer
✅ Answer: B
Abutment root surface area should be ≥ that of the replaced teeth.
Q2. The most hygienic esthetic pontic design is the:
A. Saddle (ridge lap)
B. Modified ridge lap
C. Sanitary
D. Conical
Show Answer
✅ Answer: B
The modified ridge lap balances esthetics and hygiene with minimal tissue contact.
Q3. The recommended finish line for all-ceramic crowns is a:
A. Knife edge
B. Chamfer
C. Shoulder
D. Bevel
Show Answer
✅ Answer: C
A shoulder provides bulk of material for all-ceramic restorations.
Q4. A sanitary pontic is best used in the:
A. Anterior maxilla
B. Posterior mandible
C. Anterior mandible
D. Posterior maxilla
Show Answer
✅ Answer: B
Sanitary pontics (no tissue contact) suit the non-esthetic posterior mandible.
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Dental Implants & OsseointegrationDental Ceramics — Types & SystemsOcclusion Concepts