ORE Part 2 Prosthetics & Dentures 3 — Questions and Answers
Question 1: When surveying a cast for a cobalt-chromium partial denture, what does the survey line (height of contour) determine?
- Position of clasps, rests, and the path of insertion (Correct answer)
- Shade of the denture
- Impression technique required
- Vertical dimension of occlusion
Correct answer: Position of clasps, rests, and the path of insertion
The survey line identifies the maximum convexity of each tooth, guiding placement of clasp arms (above for reciprocal, below for retentive), rests, and the optimal path of insertion.
Question 2: What is the recommended management for an immediate denture patient at the post-insertion review?
- Adjust occlusion and soft tissue pressure areas; plan for replacement denture in 6–12 months (Correct answer)
- No adjustment needed — dentures are pre-made
- Reline immediately at first review
- Extract remaining teeth
Correct answer: Adjust occlusion and soft tissue pressure areas; plan for replacement denture in 6–12 months
Immediate dentures require occlusal adjustment and relief of pressure spots at early reviews, with a definitive replacement or reline planned at 6–12 months after ridge remodelling is complete.
Question 3: Which clasp design provides the best aesthetics while maintaining adequate retention in a maxillary RPD?
- Ring clasp or RPI clasp system (Correct answer)
- Three-arm wrought clasp
- Circumferential clasp with visible buccal arm
- Adams clasp
Correct answer: Ring clasp or RPI clasp system
The RPI clasp system (rest, proximal plate, I-bar) approaches the undercut from below, making the I-bar less visible and providing better aesthetics than circumferential clasps.
Question 4: What is the primary advantage of implant-retained overdentures compared to conventional complete dentures?
- Significantly improved retention and patient satisfaction with reduced bone resorption (Correct answer)
- No risk of biological complications
- Less expensive in all cases
- Can be placed same day without planning
Correct answer: Significantly improved retention and patient satisfaction with reduced bone resorption
Implant-retained overdentures provide superior retention, stability, and masticatory function; implants also reduce alveolar bone resorption by providing mechanical stimulation.
Question 5: In the copy denture technique, what is the primary clinical advantage?
- Reproduces the polished surface of the existing denture that the patient has adapted to (Correct answer)
- Saves laboratory costs
- Provides better retention than conventional methods
- Eliminates the need for impression taking
Correct answer: Reproduces the polished surface of the existing denture that the patient has adapted to
The copy denture technique duplicates the successfully adapted polished surface (neutral zone) of a patient's existing denture, reducing adaptation time while updating occlusion and aesthetics.
Question 6: What clinical sign indicates that a lower partial denture clasp is too tight?
- Tooth tenderness, enamel abrasion at clasp contact, and difficulty seating the denture (Correct answer)
- Denture feels loose
- Excessive freeway space
- The clasp is visible when smiling
Correct answer: Tooth tenderness, enamel abrasion at clasp contact, and difficulty seating the denture
An overtight clasp causes tenderness on the abutment tooth, wear at the contact point, difficulty with insertion and removal, and potential periodontal damage if left uncorrected.
ORE Part 2 Prosthetics & Dentures 3
When surveying a cast for a cobalt-chromium partial denture, what does the survey line (height of contour) determine?