Free EFDA Dental Materials & Chairside Assisting Skills Questions and Answers

Question 1

Which dental material is commonly used for temporary fillings?

Accepted Answer

Zinc oxide-eugenol (ZOE).

Answer

Amalgam.

Answer

Composite resin.

Answer

Porcelain.

Question 2

What is the primary function of a dental liner in a cavity preparation?

Accepted Answer

To act as a protective barrier for the pulp.

Answer

To replace dentin.

Answer

To provide aesthetic shading.

Answer

To strengthen enamel.

Question 3

Which instrument is used to carry and condense amalgam into a cavity preparation?

Accepted Answer

Amalgam carrier and condenser.

Answer

Explorer.

Answer

Scaler.

Answer

Curette.

Question 4

What is the purpose of etching a tooth surface before applying composite resin?

Accepted Answer

To improve adhesion of the resin material.

Answer

To whiten the tooth.

Answer

To remove decay.

Answer

To sterilize the tooth.

Question 5

Which dental cement is often used for permanent cementation of crowns and bridges?

Accepted Answer

Glass ionomer.

Answer

Zinc phosphate.

Answer

Polycarboxylate.

Answer

Temporary cement.

Question 6

What is the correct sequence for mixing alginate impression material?

Accepted Answer

Add powder to water, mix for 45-60 seconds until creamy.

Answer

Add water to powder, mix vigorously for 1 minute.

Answer

Mix powder and water separately, then combine.

Answer

Use cold water to extend working time.

Question 7

Which material is used to take final impressions for crowns and bridges?

Accepted Answer

Polyvinyl siloxane (PVS).

Answer

Alginate.

Answer

Plaster of Paris.

Answer

Zinc oxide paste.

Question 8

What is the role of a dental dam in restorative procedures?

Accepted Answer

To isolate the operative field from saliva and debris.

Answer

To whiten teeth during treatment.

Answer

To numb the gums.

Answer

To polish restorations.

Question 9

Which chairside skill is critical when assisting with a composite restoration?

Accepted Answer

Controlling moisture with suction and air/water syringe.

Answer

Taking radiographs.

Answer

Mixing plaster.

Answer

Applying fluoride varnish.