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 crown is made chairside directly in the patient's mouth

Answer

The crown is ordered from a dental laboratory

Answer

The crown is formed using a thermoplastic matrix heated in the mouth

Question 2

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

Accepted Answer

Food impaction and periodontal irritation

Answer

Increased sensitivity to cold

Answer

Premature wear of opposing enamel

Answer

Discoloration of the provisional material

Question 3

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

Accepted Answer

An internal interference or undercut

Answer

Inadequate cement

Answer

Occlusal hypercontact

Answer

Excessive marginal flash

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

It determines the occlusal vertical dimension

Answer

It is where the provisional is most likely to fracture

Answer

It requires the use of glass ionomer cement

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

Advise the patient to wait as it will settle

Answer

Recement the provisional with more material

Answer

Remove the provisional and recheck the preparation

Question 6

Which of the following indicates the provisional crown has adequate emergence profile?

Accepted Answer

The crown contours support and mimic natural tooth emergence from the tissue

Answer

The crown contacts the adjacent teeth at the gingival margin

Answer

The crown is completely subgingival at all margins

Answer

The crown has a flat, vertical profile from the margin to the contact area

Question 7

What effect does eugenol-containing temporary cement have on subsequent resin bonding for the final restoration?

Accepted Answer

It inhibits polymerization of resin-based cements, reducing bond strength

Answer

It enhances the bond strength of composite resin cements

Answer

It has no effect on resin polymerization

Answer

It accelerates the setting of resin cements