Dental Materials Flashcards
6 cards from real MFDS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Dental Materials flashcards as text
Which monomer is the principal component of composite resin matrices?
Answer: Bis-GMA
Bis-GMA (bisphenol A glycidyl methacrylate) is the foundational dimethacrylate monomer introduced by Bowen that forms the basis of most composite resin matrices.
The setting reaction of zinc phosphate cement involves:
Answer: Acid-base neutralisation
Zinc phosphate cement sets via an acid-base reaction between zinc oxide powder and orthophosphoric acid liquid, forming zinc phosphate salt.
Which alloy system is most commonly used for high-strength dental casting alloys?
Answer: Cobalt-chromium
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.
What property of impression materials describes their ability to recover from deformation after removal from the mouth?
Answer: Elastic recovery
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.
Glass ionomer cement bonds to tooth structure primarily through:
Answer: Ionic bonding to calcium
Glass ionomer cement forms ionic bonds between carboxylate groups of the polyacid and calcium ions in hydroxyapatite, providing true chemical adhesion.
Which heat treatment process reduces the brittleness of dental porcelain?
Answer: Tempering
Tempering involves controlled cooling that induces surface compressive stresses in porcelain, increasing its resistance to crack propagation and fracture.