MFDS Dental Materials

Question 1

Which monomer is the principal component of composite resin matrices?

Accepted Answer

Bis-GMA

Answer

Bis-GMA (bisphenol A glycidyl methacrylate) is the foundational dimethacrylate monomer introduced by Bowen that forms the basis of most composite resin matrices.

Question 2

The setting reaction of zinc phosphate cement involves:

Accepted Answer

Acid-base neutralisation

Answer

Zinc phosphate cement sets via an acid-base reaction between zinc oxide powder and orthophosphoric acid liquid, forming zinc phosphate salt.

Question 3

Which alloy system is most commonly used for high-strength dental casting alloys?

Accepted Answer

Cobalt-chromium

Answer

Cobalt-chromium alloys are the most widely used base metal alloys for removable partial denture frameworks due to their high strength, hardness and corrosion resistance.

Question 4

What property of impression materials describes their ability to recover from deformation after removal from the mouth?

Accepted Answer

Elastic recovery

Answer

Elastic recovery (or strain recovery) is the ability of an impression material to return to its original dimensions after being deformed during removal from undercuts.

Question 5

Glass ionomer cement bonds to tooth structure primarily through:

Accepted Answer

Ionic bonding to calcium

Answer

Glass ionomer cement forms ionic bonds between carboxylate groups of the polyacid and calcium ions in hydroxyapatite, providing true chemical adhesion.

MFDS Part 1 Practice Test

MFDS Part 1 Practice Test

MFDS Dental Materials