Prosthodontics & Dental Materials for ORE Part 1
Guide to complete and partial denture design, custom trays, facebows, crowns (PFM/Zirconia), and impression materials.
Key Syllabus Concepts Tested in Prosthodontics & Dental Materials
- Removable partial dentures: Major connectors (Lingual bar 7-8mm clearance vs Lingual plate), Roach I-bar
- Facebow transfer recording spatial relationship of maxilla to TMJ condylar hinge axis
- Impression materials: Addition silicone (PVS) H2 gas release delay and Type IV/V die stone
- Crown preparation retention form (6° total convergence angle) and PFM shoulder margins (1.2-1.5mm)
Sample SBA Practice Questions
Sample Question 1 (Paper A)
Christensen's phenomenon refers to the posterior space created between occlusal rims during which movement?
- Lateral excursion of the mandible towards the working side
- Protrusive movement of the mandible from centric relation
- Wide opening of the mandible beyond the terminal hinge axis
- Retrusive movement of the mandible from centric relation
✅ Correct Answer: Protrusive movement of the mandible from centric relation
Explanation: As the mandible protrudes, downward forward movement of condyles along articular eminences causes posterior separation.
Clinical Pearl: SDCEP/HTM 01-05 autoclave sterilization holding time is 3 minutes at 134°C.
Sample Question 2 (Paper A)
Which major connector is preferred in an upper removable partial denture when maximum rigidity is required?
- Anterior and posterior palatal straps joined laterally to form a closed ring
- A single broad palatal strap placed across the middle of the palate
- A horseshoe connector following the palatal gingival margins anteriorly
- A single narrow palatal bar running across the middle of the palate
✅ Correct Answer: Anterior and posterior palatal straps joined laterally to form a closed ring
Explanation: An anterior-posterior palatal strap provides maximum structural rigidity while keeping rugae exposed.
Clinical Pearl: Flush dental unit waterlines (DUWLs) for 2 minutes daily and 20-30s between patients.
Sample Question 3 (Paper A)
When designing a cast post and core, what is the minimum desirable ferrule height of sound dentin required around the crown margin?
- 2.5 – 3.0 mm
- 1.5 – 2.0 mm
- 1.0 – 1.5 mm
- 0.5 – 1.0 mm
✅ Correct Answer: 1.5 – 2.0 mm
Explanation: A minimum 1.5 – 2.0 mm vertical ferrule of sound dentin wall supragingivally is essential to prevent root fracture.
Clinical Pearl: Anaphylaxis first-line treatment is immediate IM Adrenaline 0.5mg (1:1000) into anterolateral thigh.
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