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: To prevent microleakage, dental sealants should be placed under dry conditions using rubber dam isolation
A) Rubber dam
B) Moist cotton
C) Heat drying
D) Wet field
✅ Correct Answer: A
Explanation: Moisture contamination reduces the bond strength of sealants.
Q: When using a glass ionomer liner, it should be placed in a thin layer and light-cured if resin-modified to achieve optimal bonding
A) Light-cured thin layer
B) Thick layer applied
C) Bulk filled
D) No curing needed
✅ Correct Answer: A
Explanation: Thin, cured layers ensure integrity without interfering with final restoration.
Q: Fracture toughness of a dental material refers to its ability to resist crack propagation under stress
A) Thermal resistance
B) Color change
C) Crack resistance
D) Compressive stress
✅ Correct Answer: C
Explanation: Fracture toughness is essential for durability under load.
Q: Resin composites should be added in increments of 2 mm or less to avoid polymerization shrinkage stress
A) Post-curing
B) Incremental layering
C) Single fill
D) Bulk placement
✅ Correct Answer: B
Explanation: Incremental layering reduces internal stress and improves cure.
Q: The coefficient of thermal expansion in dental materials must closely match natural teeth to avoid marginal gaps
A) Hardness
B) Match enamel
C) Low cost
D) Improve color
✅ Correct Answer: B
Explanation: A matching thermal expansion coefficient prevents thermal-induced failures.