ORE Part 2 Restorative Dentistry 4

Question 1

What is the significance of the 'smile arc' in aesthetic dental assessment?

Accepted Answer

The curvature of incisal edges should follow the curve of the lower lip

Answer

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?

Accepted Answer

Periapical radiograph

Answer

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?

Accepted Answer

Two-thirds of root length

Answer

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?

Accepted Answer

Zinc phosphate cement

Answer

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?

Accepted Answer

Supragingival in enamel

Answer

Margins should be placed supragingival and within enamel to facilitate bonding, allow accurate impressions, and maintain periodontal health.

ORE Part 2 Practice Test