ORE Part 2 Prosthetics & Dentures 2 — Questions and Answers
Question 1: What impression technique is used to record a flabby anterior ridge for a complete denture?
- Selective pressure technique using window impression (Correct answer)
- Conventional mucocompressive impression
- Addition silicone full arch impression
- Alginate wash impression only
Correct answer: Selective pressure technique using window impression
A window (closed window) or selective pressure technique uses a special tray with a relief window over the flabby tissue, allowing mucocompression of stable areas while minimising displacement of flabby tissue.
Question 2: What is the significance of the Camper's plane in complete denture construction?
- Used to set the occlusal plane parallel to the ala-tragus line (Correct answer)
- Guides tooth shade selection
- Determines OVD
- Establishes the neutral zone
Correct answer: Used to set the occlusal plane parallel to the ala-tragus line
Camper's plane (ala-tragus line) is used as a reference to orient the occlusal plane of complete dentures parallel to the floor, contributing to aesthetics and balanced occlusion.
Question 3: Which denture base material has the highest thermal conductivity, beneficial to palateless dentures?
- Cobalt-chromium metal alloy (Correct answer)
- Heat-cured acrylic
- Cold-cured acrylic
- Flexible nylon (Valplast)
Correct answer: Cobalt-chromium metal alloy
Cobalt-chromium alloys have significantly higher thermal conductivity than acrylic, allowing patients to sense temperature from food and drinks — an advantage for palateless or reduced coverage dentures.
Question 4: What is a Kennedy Class I partial denture classification?
- Bilateral free-end saddle (missing posterior teeth on both sides) (Correct answer)
- Unilateral free-end saddle
- Bounded saddle with natural teeth on both sides
- Single anterior space
Correct answer: Bilateral free-end saddle (missing posterior teeth on both sides)
Kennedy Class I is defined as a bilateral edentulous area posterior to the remaining natural teeth (bilateral free-end saddles), the most challenging classification for removable partial dentures.
Question 5: What is the role of a rest seat in a cobalt-chromium partial denture?
- Transmit occlusal forces to the tooth and prevent denture sinking (Correct answer)
- Retain the denture in the mouth
- Guide the path of insertion
- Prevent lateral movement of the denture only
Correct answer: Transmit occlusal forces to the tooth and prevent denture sinking
Rest seats receive the occlusal rests of the RPD framework, directing occlusal forces along the long axis of the tooth and preventing the denture from sinking into the soft tissues.
Question 6: What is the appropriate treatment for angular cheilitis associated with denture wearing?
- Antifungal cream (miconazole) and review denture OVD (Correct answer)
- Antibiotic cream only
- Extraction of upper front teeth
- New denture immediately without treatment
Correct answer: Antifungal cream (miconazole) and review denture OVD
Angular cheilitis in denture wearers is usually caused by Candida or mixed infections; miconazole cream addresses the infection while reviewing OVD corrects any vertical dimension loss contributing to the condition.
ORE Part 2 Prosthetics & Dentures 2
What impression technique is used to record a flabby anterior ridge for a complete denture?