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

Question 1

Which of the following materials is applied in a thin layer to seal dentinal tubules and is contraindicated for use with composite resin restorations because it interferes with adhesion?

Accepted Answer

Cavity Varnish

Answer

Calcium Hydroxide

Answer

Glass Ionomer

Answer

Zinc Phosphate Cement

Question 2

A patient requires a deep amalgam restoration on a molar. To provide thermal insulation for the pulp and to support the restoration during placement, the dentist will likely request which material to be placed in a thick layer?

Accepted Answer

A dental base

Answer

A dental liner

Answer

A cavity sealant

Answer

A dentin sealer

Question 3

Which of the following is a primary function of a calcium hydroxide liner, such as Dycal?

Accepted Answer

To stimulate the formation of reparative (secondary) dentin.

Answer

To release fluoride and prevent recurrent decay.

Answer

To provide high compressive strength under a restoration.

Answer

To chemically bond to the overlying restorative material.

Question 4

An EFDA is preparing materials for a Class V restoration that will use a glass ionomer (GI) base. Which of the following is a key advantage of using a GI material in this scenario?

Accepted Answer

It releases fluoride, which can help inhibit recurrent caries.

Answer

It has a sedative effect on the pulp.

Answer

It is the strongest base material available.

Answer

It requires a varnish to be placed over it for protection.

Question 5

When mixing Zinc Phosphate cement to be used as a base, why is it crucial to mix it on a cool, glass slab over a wide area?

Accepted Answer

To dissipate the heat from the exothermic reaction.

Answer

To accelerate the setting time for a faster procedure.

Answer

To increase the final compressive strength of the cement.

Answer

To incorporate more powder into the liquid for a thicker mix.

Question 6

A dentist has completed a deep cavity preparation for an amalgam restoration and is concerned about postoperative sensitivity and microleakage. Which of the following materials would be applied in a thin layer to seal the dentinal tubules *before* placing the amalgam?

Accepted Answer

Cavity Varnish

Answer

Resin-modified glass ionomer

Answer

Flowable composite

Answer

Calcium hydroxide