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: Zinc oxide eugenol is best known for
A) Fluoride release
B) High tensile strength
C) Sedative properties
D) Permanent restorations
✅ Correct Answer: C
Explanation: Eugenol provides a soothing effect on the pulp, giving it sedative properties.
Q: Amalgam requires the presence of
A) Polymerization reaction
B) Adequate cavity depth
C) Moisture control
D) High esthetics
✅ Correct Answer: B
Explanation: Proper cavity depth is necessary for mechanical retention and strength in amalgam restorations.
Q: Polymerization shrinkage is associated with
A) Zinc phosphate
B) Glass ionomer
C) Composite resin
D) Amalgam
✅ Correct Answer: C
Explanation: Composite resins undergo shrinkage during curing, which can cause marginal gaps.
Q: A primary advantage of using alginate as an impression material
A) Quick setting time
B) High accuracy
C) Resistance to tear
D) Dimensional stability
✅ Correct Answer: A
Explanation: Alginate sets quickly, making it convenient for preliminary impressions.
Q: Gypsum products are commonly used for
A) Model and die fabrication
B) Etching enamel
C) Final restorations
D) Cavity liners
✅ Correct Answer: A
Explanation: Gypsum is used to create accurate models and dies for restorative procedures.
Q: High-copper amalgam is preferred because
A) Sets faster
B) Reduces corrosion
C) Has a smoother surface
D) Releases fluoride
✅ Correct Answer: B
Explanation: High-copper amalgam forms less gamma-2 phase, improving corrosion resistance.
Q: The purpose of using a silane coupling agent in composites
A) Reduces viscosity
B) Acts as a solvent
C) Improves bond between filler and resin
D) Enhances esthetics
✅ Correct Answer: C
Explanation: Silane helps chemically bond the inorganic filler to the resin matrix.
Q: Zinc phosphate cement is known to be
A) Highly biocompatible
B) Acidic on mixing
C) Light cured
D) Antibacterial
✅ Correct Answer: B
Explanation: Zinc phosphate has an initially low pH, which may irritate the pulp.
Q: Setting reaction of gypsum involves
A) Acid-base reaction
B) Polymerization
C) Hydration
D) Gelation
✅ Correct Answer: C
Explanation: When water is added, gypsum undergoes a hydration reaction to set.
Q: The filler particles in composite resin help to
A) Increase water absorption
B) Initiate curing
C) Decrease strength
D) Improve wear resistance
✅ Correct Answer: D
Explanation: Filler particles strengthen the composite and reduce wear during function.