DANB CDA Dental Materials

Question 1

What is the setting reaction of alginate impression material?

Accepted Answer

An irreversible hydrocolloid reaction

Answer

A reversible thermal reaction

Answer

An acid-base reaction with water

Answer

A polymerization chain reaction

Question 2

Which type of cement is commonly used for permanent cementation of crowns?

Accepted Answer

Glass ionomer cement

Answer

Zinc oxide eugenol

Answer

Calcium hydroxide

Answer

Temporary cement

Question 3

What is the purpose of an etchant in bonding procedures?

Accepted Answer

To create microscopic roughness on enamel for mechanical retention

Answer

To sterilize the cavity preparation

Answer

To numb the tooth nerve

Answer

To seal the restoration surface

Question 4

What is the working time of a dental material?

Accepted Answer

The time from start of mixing until the material becomes too stiff to manipulate

Answer

The total time until the material fully hardens

Answer

The time the material remains in the patient's mouth

Answer

The shelf life of the material

Question 5

Which dental material releases fluoride and is used as a liner under restorations?

Accepted Answer

Glass ionomer

Answer

Composite resin

Answer

Amalgam

Answer

Gold alloy

Question 6

What is the primary disadvantage of amalgam as a restorative material?

Accepted Answer

Poor esthetics due to its silver/gray color

Answer

Inability to bond to tooth structure

Answer

Low compressive strength

Answer

Rapid deterioration in the oral environment