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: Porosity in acrylic resin dentures results from
A) Air entrapment
B) High temperature
C) Low polymerization
D) Excess pressure
✅ Correct Answer: A
Explanation: Entrapped air during processing leads to porosity in acrylics.
Q: Zinc oxide eugenol is primarily used as
A) Permanent cement
B) Impression material
C) Temporary filling
D) Etchant
✅ Correct Answer: C
Explanation: ZOE is commonly used for temporary restorations and fillings.
Q: Tensile strength is highest in
A) Composite
B) Amalgam
C) Polyether
D) Porcelain
✅ Correct Answer: A
Explanation: Composite materials possess superior tensile strength among options.
Q: Flexibility of impression materials is lowest in
A) Polyether
B) Alginate
C) Agar
D) Silicone
✅ Correct Answer: A
Explanation: Polyether materials are rigid and have the least flexibility.
Q: The monomer in cold-cure acrylic resin is
A) Methyl methacrylate
B) TEGDMA
C) Hydroquinone
D) Benzoyl peroxide
✅ Correct Answer: A
Explanation: Methyl methacrylate acts as the main monomer in acrylics.
Q: Retarders in gypsum products include
A) Sodium chloride
B) Aluminum sulfate
C) K2SO4
D) Borax
✅ Correct Answer: D
Explanation: Borax is commonly used to delay gypsum setting.
Q: Type IV gypsum is also called
A) Die stone
B) Impression stone
C) Stone
D) Plaster
✅ Correct Answer: A
Explanation: Type IV is known as die stone due to its high strength and low expansion.
Q: Stainless steel crowns are most commonly used in
A) Orthodontics
B) Prosthodontics
C) Pediatric dentistry
D) Adults
✅ Correct Answer: C
Explanation: Stainless steel crowns are preferred for children’s posterior teeth.
Q: Viscosity of a fluid is defined as
A) Elasticity
B) Volume
C) Rigidity
D) Resistance to flow
✅ Correct Answer: D
Explanation: Viscosity measures a fluid’s resistance to flowing.
Q: Wax patterns should be invested immediately to
A) Avoid distortion
B) Prevent shrinkage
C) Increase strength
D) Enhance setting
✅ Correct Answer: A
Explanation: Immediate investing prevents distortion from stress relaxation.