EFDA - Expanded Function Dental Auxiliary Bases, Liners, and Matrices Questions and Answers

Question 1

A dentist completes a deep cavity preparation on a molar with a suspected microscopic pulp exposure.
Which material is specifically placed in a thin layer over the site to promote the formation of reparative dentin?

Accepted Answer

Calcium Hydroxide

Answer

Zinc Oxide-Eugenol (ZOE)

Answer

Zinc Phosphate Cement

Answer

Glass Ionomer

Question 2

An EFDA is preparing materials for a large Class II composite restoration. The dentist requests a base for thermal insulation. Which of the following materials must be AVOIDED for use as a base directly under a composite resin restoration?

Accepted Answer

Zinc Oxide-Eugenol (ZOE)

Answer

Resin-Modified Glass Ionomer (RMGI)

Answer

Flowable Composite

Answer

Calcium Hydroxide

Question 3

For a Class II MO composite restoration on tooth #29, which matrix system is generally preferred to achieve the most anatomically correct contact and contour?

Accepted Answer

Sectional matrix with a separating ring

Answer

Universal (Tofflemire) matrix

Answer

Mylar strip and wedge

Answer

Pre-formed metal shell crown

Question 4

When placing a posterior matrix band for a Class II restoration, what is the primary function of a wooden or plastic wedge?

Accepted Answer

To adapt the band tightly against the gingival margin of the preparation.

Answer

To etch the interproximal tooth surface.

Answer

To hold the matrix band retainer in place.

Answer

To prevent moisture contamination from the pulp.

Question 5

Which of the following statements best describes the primary difference between a dental liner and a dental base?

Accepted Answer

Liners are placed in a thin layer for pulpal protection, while bases are placed in a thicker layer for mechanical support.

Answer

Liners are used for thermal insulation, while bases are used to stimulate reparative dentin.

Answer

Liners are only used under amalgam restorations, while bases are only used under composite restorations.

Answer

Liners release high levels of fluoride, while bases are primarily sedative in nature.

Question 6

When an EFDA assembles a universal (Tofflemire) retainer and band for a Class II restoration on tooth #19 (lower left quadrant), the U-shaped head of the retainer should be oriented:

Accepted Answer

towards the gingiva.

Answer

towards the patient's cheek (buccal).

Answer

towards the occlusal surface.

Answer

towards the anterior of the mouth.

A dentist completes a deep cavity preparation on a molar with a suspected microscopic pulp exposure.Which material is specifically placed in a thin layer over the site to promote the formation of reparative dentin?

A dentist completes a deep cavity preparation on a molar with a suspected microscopic pulp exposure.
Which material is specifically placed in a thin layer over the site to promote the formation of reparative dentin?