EFDA - Expanded Function Dental Auxiliary Provisional Crown Fabrication Questions and Answers

Question 1

An EFDA is fabricating a provisional crown using the direct technique with a bis-acryl composite material.
After the initial set, the EFDA removes the provisional from the prepared tooth and notices a rough, sticky, oxygen-inhibited layer on the surface.
What is the most appropriate next step to manage this layer before final finishing and polishing?

Accepted Answer

Wipe the surface with an alcohol-soaked gauze.

Answer

Immediately begin trimming with an acrylic bur.

Answer

Apply a thin layer of unfilled resin and light-cure.

Answer

Rinse the provisional vigorously with an air-water syringe.

Question 2

A patient calls the dental office stating that their recently placed provisional crown on tooth #30 has come off while eating. Which of the following instructions is MOST critical for the EFDA to provide to the patient?

Accepted Answer

Schedule an appointment to have the provisional re-cemented as soon as possible.

Answer

Keep the tooth clean and avoid chewing on that side.

Answer

Attempt to re-cement the crown at home using denture adhesive.

Answer

Discard the provisional crown as it is no longer needed.

Question 3

When an EFDA is checking the marginal fit of a newly fabricated provisional crown, what is the ideal characteristic they should be looking for?

Accepted Answer

A smooth, snug fit with no gaps or ledges at the finish line.

Answer

A slightly open margin to allow space for cement.

Answer

A margin that is 1mm short of the preparation finish line.

Answer

A margin that extends 0.5mm subgingivally for better retention.

Question 4

An EFDA is providing post-operative instructions to a patient after cementing a provisional crown. Which instruction regarding flossing is correct?

Accepted Answer

Slide the floss out to the side (buccally or lingually) after passing it through the contact.

Answer

Avoid flossing around the provisional crown entirely until the permanent crown is placed.

Answer

Pull the floss straight up and out after passing through the contact.

Answer

Snap the floss through the contact to ensure the area is clean.

Question 5

Which of the following materials used for provisional crown fabrication is known for its high esthetics, good strength, minimal setting shrinkage, and low exothermic heat reaction during polymerization?

Accepted Answer

Bis-acryl composite resin

Answer

Polymethyl methacrylate (PMMA)

Answer

Polycarbonate

Answer

Zinc oxide eugenol (ZOE)

Question 6

During the fabrication of a custom provisional crown, a matrix or stent is created before the tooth is prepared. What is the primary purpose of this matrix?

Accepted Answer

To serve as a mold for the external contours of the provisional crown.

Answer

To record the patient's bite registration.

Answer

To protect the gingival tissues during tooth preparation.

Answer

To check for adequate occlusal clearance after preparation.