EFDA Provisional Crown Fabrication 3

Question 1

Which of the following best describes the 'indirect' method of provisional crown fabrication?

Accepted Answer

The crown is fabricated on a diagnostic cast outside the mouth

Answer

The indirect method involves fabricating the provisional on a study model or working cast outside the patient's mouth, reducing intraoral exposure to heat and monomer.

Question 2

Contour errors on the proximal surfaces of a provisional crown can cause:

Accepted Answer

Food impaction and periodontal irritation

Answer

Improper proximal contours create open contacts or ledges that trap food, leading to periodontal inflammation and patient discomfort.

Question 3

A provisional crown shows a 'rocking' motion when seated. This most likely indicates:

Accepted Answer

An internal interference or undercut

Answer

A rocking motion indicates an internal high spot or undercut preventing complete and stable seating of the provisional crown.

Question 4

What is the significance of the 'critical zone' (0–3 mm from the gingival margin) on a provisional crown?

Accepted Answer

It must be highly polished to prevent plaque accumulation and tissue irritation

Answer

The gingival third of the provisional must be smooth and well-polished because surface roughness in this zone promotes bacterial adhesion and gingival inflammation.

Question 5

If a patient reports that their provisional crown feels 'high' after anesthesia wears off, the EFDA should:

Accepted Answer

Reappoint the patient and adjust the occlusion

Answer

Occlusal premature contacts cause discomfort and potential damage; the patient must be seen to adjust the occlusion of the provisional.

(EFDA) Expanded Function Dental Auxiliary Practice Test

(EFDA) Expanded Function Dental Auxiliary Practice Test

EFDA Provisional Crown Fabrication 3