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: Calcium hydroxide is commonly used for
A) Pit and fissure sealing
B) Pulp capping
C) Etching enamel
D) Orthodontic bonding
✅ Correct Answer: B
Explanation: Calcium hydroxide promotes reparative dentin formation, making it ideal for pulp capping.
Q: A major disadvantage of polyether impression material
A) Stiffness after setting
B) Short working time
C) Hydrophobic nature
D) High flexibility
✅ Correct Answer: A
Explanation: Polyether becomes rigid once set, making it difficult to remove in undercut areas.
Q: Resin-modified glass ionomer differs from traditional GIC due to
A) Polymerizable resin component
B) Addition of metal
C) Lack of fluoride
D) Presence of zinc
✅ Correct Answer: A
Explanation: The resin component allows light-curing and improved mechanical properties.
Q: Delayed expansion in zinc-containing amalgams occurs due to
A) Polymerization shrinkage
B) Corrosion
C) Moisture contamination
D) Incomplete mixing
✅ Correct Answer: C
Explanation: Moisture contamination during trituration can lead to delayed expansion in zinc amalgams.
Q: Abrasiveness of a dental material is measured by
A) Solubility index
B) Optical density
C) Hardness number
D) Tensile strength
✅ Correct Answer: C
Explanation: Hardness determines the material's ability to resist surface deformation and abrasion.
Q: The component in amalgam alloy responsible for strength
A) Mercury
B) Copper
C) Silver
D) Tin
✅ Correct Answer: C
Explanation: Silver enhances strength and durability in dental amalgam.
Q: The ideal impression material for complete denture final impressions
A) Polyether
B) Bite registration wax
C) Alginate
D) Zinc oxide eugenol paste
✅ Correct Answer: D
Explanation: Zinc oxide eugenol provides fine detail and stability for denture impressions.
Q: Porosity in acrylic resin dentures may result from
A) Slow mixing
B) Adequate pressure
C) Cold curing
D) Rapid heating
✅ Correct Answer: D
Explanation: Rapid heating causes vaporization of monomer, leading to porosity in the final denture.
Q: Fluoride release from glass ionomer contributes to
A) Esthetic appearance
B) Increased opacity
C) Caries prevention
D) Faster setting time
✅ Correct Answer: C
Explanation: Fluoride ions help remineralize enamel and prevent secondary caries.
Q: Dimensional stability of an impression material determines how well it retains its original shape over time
A) Polyether
B) Agar
C) Alginate
D) Silicone
✅ Correct Answer: D
Explanation: Silicone materials offer excellent dimensional stability even after delays in pouring.