ORE Part 2 Restorative Dentistry 1 — Questions and Answers
Question 1: According to UK standards, what is the recommended minimum cavity preparation depth for a Class I amalgam restoration?
- 1.5 mm (Correct answer)
- 2.0 mm
- 2.5 mm
- 1.0 mm
Correct answer: 1.5 mm
A minimum depth of 1.5 mm is required for amalgam restorations to ensure adequate strength and prevent fracture under occlusal loading.
Question 2: Which matrix system is most appropriate for a Class II composite restoration involving a tight contact area?
- Sectional matrix with separation ring (Correct answer)
- Tofflemire matrix
- Siqveland matrix
- Dead-soft foil matrix
Correct answer: Sectional matrix with separation ring
A sectional matrix system with a separation ring (e.g., Palodent) creates a tight, properly contoured proximal contact for Class II composites.
Question 3: What is the primary advantage of rubber dam use during restorative procedures in the UK?
- Moisture control and cross-infection prevention (Correct answer)
- Improved patient comfort
- Reduced preparation time
- Better visibility of occlusion
Correct answer: Moisture control and cross-infection prevention
Rubber dam provides moisture control essential for bonding procedures and acts as a barrier preventing cross-contamination and aspiration of materials.
Question 4: When placing a posterior composite, which technique best reduces polymerisation shrinkage stress?
- Incremental layering technique (Correct answer)
- Bulk-fill in a single increment
- Flowable composite base only
- Using large increments with long cure times
Correct answer: Incremental layering technique
Incremental layering limits the C-factor and reduces total shrinkage stress by curing smaller volumes at a time, improving marginal adaptation.
Question 5: In the UK, which shade guide is most commonly used for shade selection in anterior restorations?
- VITA Classical (Correct answer)
- Munsell
- NBS
- Ostwald
Correct answer: VITA Classical
The VITA Classical shade guide (A1–D4) is the most widely used in UK dental practice for matching tooth colour in restorations.
Question 6: What does the term 'ferrule effect' refer to in crown preparation?
- A band of tooth structure encircled by the crown margin (Correct answer)
- The use of a metal post to support a core
- The occlusal reduction required for a full coverage crown
- The taper angle of the preparation
Correct answer: A band of tooth structure encircled by the crown margin
The ferrule effect refers to a 360-degree band of sound dentine encircled by the crown, providing resistance to fracture and improving crown retention.
ORE Part 2 Restorative Dentistry 1
According to UK standards, what is the recommended minimum cavity preparation depth for a Class I amalgam restoration?