NDAEB Dental Materials and Equipment

Question 1

Dental amalgam is formed when mercury reacts with which alloy?

Accepted Answer

Silver-tin alloy

Answer

Gold and platinum alloy

Answer

Zinc and copper alloy

Answer

Nickel-chromium alloy

Question 2

Which type of composite resin is BEST suited for high-stress posterior restorations?

Accepted Answer

Packable (condensable) composite

Answer

Microfilled composite

Answer

Flowable composite

Answer

Nanofilled composite

Question 3

Glass ionomer cement is unique among restorative materials because it continuously releases which beneficial ion?

Accepted Answer

Fluoride

Answer

Calcium

Answer

Phosphate

Answer

Sodium

Question 4

What does 'working time' mean when referring to dental restorative materials?

Accepted Answer

Time from start of mixing during which the material can be manipulated

Answer

Time from mixing to complete final set

Answer

Total shelf life of the material before use

Answer

Time the patient must wait before eating

Question 5

What is the primary purpose of placing a base material in a deep tooth preparation before restoring?

Accepted Answer

To provide pulpal protection from thermal and chemical stimulation

Answer

To improve the color of the restoration

Answer

To increase the working time of the restorative material

Answer

To chemically bond the restoration to enamel

Question 6

What is the purpose of acid etching enamel before placing a composite resin restoration?

Accepted Answer

To create micro-porosities for mechanical retention of the bonding resin

Answer

To sterilize the tooth surface before bonding

Answer

To remove carious dentin completely

Answer

To chemically activate the composite material

Question 7

Which dental restorative material forms a true chemical bond with both enamel and dentin without requiring a separate bonding agent?

Accepted Answer

Glass ionomer cement

Answer

Zinc phosphate cement

Answer

Composite resin

Answer

Amalgam