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

Alginate is the most common material used to take a preoperative impression for fabricating a provisional crown matrix due to its ease of use and cost-effectiveness.

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

The provisional margin should be placed flush with or 0.5 mm subgingival to protect the preparation and maintain tissue health.

Question 3

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

Accepted Answer

Less exothermic reaction during setting

Answer

Bis-acryl composites produce significantly less heat during polymerization compared to PMMA, reducing the risk of pulpal damage.

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

Without proper occlusal contacts, the opposing tooth will over-erupt into the open space, compromising the space for the final restoration.

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

The reline technique seats an initial shell over the preparation and adds fresh material inside to create an accurate fit to the actual tooth preparation.

(EFDA) Expanded Function Dental Auxiliary Practice Test

(EFDA) Expanded Function Dental Auxiliary Practice Test

EFDA Provisional Crown Fabrication 2