EFDA Provisional Crown Fabrication 2

Question 1

Which impression material is most commonly used to create the matrix for a direct provisional crown?

Accepted Answer

Alginate

Answer

Polyvinyl siloxane

Answer

Zinc oxide eugenol

Answer

Plaster of Paris

Question 2

When trimming a provisional crown, the marginal finish line should be:

Accepted Answer

Flush with the gingival margin or 0.5 mm subgingival

Answer

Extended 2 mm subgingivally

Answer

Left at the mid-buccal surface

Answer

Trimmed to the height of the preparation shoulder

Question 3

Which property of bis-acryl composite makes it preferable to PMMA for provisional crowns?

Accepted Answer

Less exothermic reaction during setting

Answer

Lower cost

Answer

Longer working time

Answer

Greater flexibility

Question 4

A provisional crown that lacks occlusal contacts on opposing teeth will most likely result in:

Accepted Answer

Over-eruption of the opposing tooth

Answer

Supra-eruption of the prepared tooth

Answer

Improved patient comfort

Answer

Reduced wear on the provisional

Question 5

The 'reline' technique for a provisional crown involves:

Accepted Answer

Adding fresh acrylic inside the initial shell after seating on the preparation

Answer

Replacing the entire provisional with a new one

Answer

Polishing the internal surface of the crown

Answer

Adjusting occlusion with a carbide bur

Question 6

Which cement is most appropriate for temporizing a provisional crown on a tooth with a short clinical crown?

Accepted Answer

Non-eugenol temporary cement

Answer

Zinc phosphate cement

Answer

Glass ionomer cement

Answer

Resin-modified glass ionomer

Question 7

After polishing a PMMA provisional crown, what is the FIRST step before cementing it?

Accepted Answer

Check and adjust occlusion on the articulating paper

Answer

Apply fluoride varnish

Answer

Rinse with chlorhexidine

Answer

Coat with a sealant