Dental Materials MCQs
Dental Materials MCQs cover properties, manipulation, and clinical use of dental amalgam, composites, glass ionomers, impression materials, and adhesives, helping BDS and MDCAT students prepare effectively for exams and dental practice knowledge.
Q: Delayed expansion in zinc-containing amalgam is caused by
A) Lack of pressure
B) Over-trituration
C) Excess mercury
D) Moisture contamination
✅ Correct Answer: D
Explanation: Moisture contamination causes hydrogen gas formation, leading to delayed expansion.
Q: Cohesive failure occurs within the
A) Adhesive
B) Substrate
C) Interface
D) Material itself
✅ Correct Answer: D
Explanation: Cohesive failure happens when the fracture is inside the adhesive or restorative material.
Q: High copper amalgams exhibit
A) Low strength
B) High creep
C) Corrosion
D) No gamma-2 phase
✅ Correct Answer: D
Explanation: High copper amalgams eliminate the weak gamma-2 phase for improved properties.
Q: Polymerization shrinkage is lowest in
A) Microfill composite
B) Hybrid composite
C) Bulk-fill composite
D) Flowable composite
✅ Correct Answer: C
Explanation: Bulk-fill composites are engineered to reduce polymerization shrinkage.
Q: Glass ionomer cements are primarily bonded to tooth structure by
A) Mechanical retention
B) Ionic interaction
C) Resin tags
D) Chelation with collagen
✅ Correct Answer: B
Explanation: Ionic bonds form between glass ionomer and calcium in the tooth.