Dental Materials MCQs
Dental Materials MCQs test the understanding of restorative and preventive materials used in dentistry. Topics include dental amalgam, composite resins, glass ionomers, impression materials, and adhesives. These MCQs are valuable for BDS and MDCAT students aiming to grasp the properties, manipulation, and clinical use of dental materials.
Q: Etching enamel improves
A) Caries resistance
B) Bond strength
C) Salivary flow
D) Surface shine
✅ Correct Answer: B
Explanation: Etching increases surface roughness, enhancing adhesive bonding.
Q: Polymerization shrinkage in composite leads to
A) Strength increase
B) Marginal gap
C) Thermal resistance
D) Antibacterial effect
✅ Correct Answer: B
Explanation: Shrinkage during curing may cause marginal gaps in restorations.
Q: An impression tray should provide
A) Minimum retention
B) High salivation
C) Poor fit
D) Maximum support
✅ Correct Answer: D
Explanation: A well-fitting tray provides uniform support and prevents distortion.
Q: Type IV gypsum is ideal for
A) Study models
B) Temporary crowns
C) Alginate impressions
D) Die fabrication
✅ Correct Answer: D
Explanation: Type IV stone has high strength and low expansion, perfect for dies.
Q: Zinc phosphate cement is mixed on
A) Plastic sheet
B) Cotton roll
C) Glass slab
D) Wooden spatula
✅ Correct Answer: C
Explanation: A glass slab helps control the exothermic reaction during mixing.
Q: Waxes used in dentistry are classified by
A) Source
B) Flexibility
C) Color
D) Price
✅ Correct Answer: A
Explanation: Dental waxes can be natural (beeswax), synthetic, or mineral-based.
Q: Cohesive gold foil is used in
A) Orthodontics
B) Temporary crowns
C) Veneers
D) Inlays
✅ Correct Answer: D
Explanation: Gold foil provides precise adaptation for small restorations like inlays.
Q: Self-cure resins are activated by
A) Saliva
B) Mixing two pastes
C) Heat only
D) UV light
✅ Correct Answer: B
Explanation: Self-cure resins polymerize chemically when two components are mixed.
Q: Elastic recovery is critical in
A) Impression materials
B) Dental burs
C) Orthodontic wires
D) Finishing strips
✅ Correct Answer: A
Explanation: Impression materials must return to original shape after removal.
Q: Condensation silicones release
A) Ammonia
B) Oxygen
C) Water
D) Hydrogen gas
✅ Correct Answer: D
Explanation: Condensation silicones release hydrogen gas during setting, requiring delayed pouring.