ORE Part 2 Restorative Dentistry 3 — Questions and Answers
Question 1: What is the most common cause of secondary caries around existing restorations?
- Microleakage at the restoration margin (Correct answer)
- Poor aesthetics
- Incorrect shade selection
- Over-polishing the surface
Correct answer: Microleakage at the restoration margin
Microleakage allows oral fluids and bacteria to penetrate the restoration margin, leading to demineralisation and secondary (recurrent) caries.
Question 2: When assessing a tooth for a crown, which finding is an absolute contraindication?
- Non-restorable caries extending below the alveolar crest (Correct answer)
- Absence of opposing occlusion
- Patient preference for composite
- Mild sensitivity to cold
Correct answer: Non-restorable caries extending below the alveolar crest
If caries or tooth destruction extends below the alveolar crest with insufficient ferrule, the tooth cannot be adequately restored with a crown.
Question 3: In the BEWE (Basic Erosive Wear Examination), a score of 3 indicates:
- Hard tissue loss of more than 50% of the surface area (Correct answer)
- Any surface change in enamel only
- Hard tissue loss less than 50%
- No erosive wear present
Correct answer: Hard tissue loss of more than 50% of the surface area
A BEWE score of 3 denotes severe erosive wear with hard tissue loss exceeding 50% of the surface, requiring urgent management.
Question 4: Which bonding agent generation is currently recommended for optimal dentine bonding in UK restorative practice?
- Seventh or eighth generation (universal adhesives) (Correct answer)
- First generation
- Third generation
- Fifth generation only
Correct answer: Seventh or eighth generation (universal adhesives)
Universal (7th/8th generation) adhesives offer versatility, effective bonding to enamel and dentine, and can be used in etch-and-rinse or self-etch modes.
Question 5: What is the primary reason for bevelling enamel margins in anterior composite restorations?
- Increase bonding surface area and improve aesthetics (Correct answer)
- Reduce preparation time
- Prevent hypersensitivity
- Create a retention form
Correct answer: Increase bonding surface area and improve aesthetics
Bevelling exposes enamel prisms end-on, increasing the bonding area and allowing a gradual colour transition for improved aesthetic blending.
Question 6: When should a patient be referred for tooth whitening on the NHS in the UK?
- NHS whitening is not available; it is a cosmetic procedure (Correct answer)
- When decay is present
- After orthodontic treatment only
- For all patients requesting it
Correct answer: NHS whitening is not available; it is a cosmetic procedure
Tooth whitening is classified as a cosmetic procedure and is not available on the NHS; patients must access it privately through a registered dental professional.
ORE Part 2 Restorative Dentistry 3
What is the most common cause of secondary caries around existing restorations?