ORE Part 2 Restorative Dentistry 4 — Questions and Answers
Question 1: What is the significance of the 'smile arc' in aesthetic dental assessment?
- The curvature of incisal edges should follow the curve of the lower lip (Correct answer)
- The upper lip should cover at least half of the upper incisors
- The buccal corridor should be maximised
- The midline must be perfectly centred
Correct answer: The curvature of incisal edges should follow the curve of the lower lip
An aesthetic smile arc means the curvature formed by the upper incisal edges mirrors the inner curve of the lower lip when smiling.
Question 2: Which radiograph is most useful for assessing the length and curvature of roots before post placement?
- Periapical radiograph (Correct answer)
- Panoramic radiograph
- Bitewing radiograph
- Occlusal radiograph
Correct answer: Periapical radiograph
Periapical radiographs give the most accurate view of root length, curvature, and canal anatomy, essential for safe post preparation.
Question 3: What is the minimum recommended post length in relation to root length?
- Two-thirds of root length (Correct answer)
- One-third of root length
- Full root length
- Half of root length
Correct answer: Two-thirds of root length
The post should extend at least two-thirds of the root length to distribute stress and prevent root fracture, while retaining 4–5 mm of apical seal.
Question 4: Which cement is contraindicated for luting glass ceramic crowns?
- Zinc phosphate cement (Correct answer)
- Resin cement
- Resin-modified glass ionomer
- Dual-cure composite cement
Correct answer: Zinc phosphate cement
Zinc phosphate cement lacks adhesive bonding, reducing retention for all-ceramic crowns that rely on adhesive luting for strength and aesthetics.
Question 5: In tooth preparation for a ceramic veneer, where should the margin ideally be placed?
- Supragingival in enamel (Correct answer)
- Subgingival below the epithelial attachment
- At the gingival crest in dentine
- Mid-sulcus in dentine
Correct answer: Supragingival in enamel
Margins should be placed supragingival and within enamel to facilitate bonding, allow accurate impressions, and maintain periodontal health.
Question 6: According to the FGDP(UK), what does 'Delivering Better Oral Health' primarily guide?
- Evidence-based preventive advice for dental teams (Correct answer)
- Restorative technique standards
- Radiography regulations
- Specialist referral criteria
Correct answer: Evidence-based preventive advice for dental teams
'Delivering Better Oral Health' is the Public Health England toolkit providing evidence-based guidance on preventive interventions for all dental patients.
ORE Part 2 Restorative Dentistry 4
What is the significance of the 'smile arc' in aesthetic dental assessment?