EFDA Restorative & Preventive Dental Procedures 2

Question 1

Which matrix system is most commonly used for Class II composite restorations in posterior teeth?

Accepted Answer

Sectional matrix system

Answer

Sectional matrix systems provide better contact point reproduction and contour for posterior composite restorations than circumferential matrices.

Question 2

When placing a Class V glass ionomer restoration, what is the primary reason for conditioning the cavity preparation?

Accepted Answer

To remove the smear layer and enhance adhesion

Answer

Conditioning with polyacrylic acid removes the smear layer and activates the tooth surface for chemical bonding with glass ionomer.

Question 3

A patient presents with a newly placed amalgam restoration that is high in occlusion. The FIRST step the EFDA should take is:

Accepted Answer

Use articulating paper to identify high spots

Answer

Articulating paper marks the premature contacts so the EFDA can identify and adjust the high spots under dentist supervision.

Question 4

Which fluoride concentration is found in professionally applied fluoride varnish?

Accepted Answer

5% NaF (2.26% F)

Answer

Professional fluoride varnish contains 5% sodium fluoride, delivering 22,600 ppm of fluoride to tooth surfaces.

Question 5

During composite placement, the incremental layering technique is used primarily to:

Accepted Answer

Reduce polymerization shrinkage stress

Answer

Placing composite in 2 mm increments reduces the C-factor and minimizes polymerization shrinkage stress at the tooth-restoration interface.

(EFDA) Expanded Function Dental Auxiliary Practice Test