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: The most commonly used material for fabrication of custom trays in complete denture procedures is auto-polymerizing acrylic resin
A) Light-cure composite
B) Auto-polymerizing acrylic
C) Thermoplastic sheet
D) Polycarbonate
✅ Correct Answer: B
Explanation: Auto-polymerizing acrylic is preferred due to ease of manipulation and cost-effectiveness.
Q: During the setting of gypsum, the chemical reaction leads to formation of interlocking needle-like crystals of calcium sulfate dihydrate
A) Expansion
B) Crystallization
C) Heat absorption
D) Water loss
✅ Correct Answer: B
Explanation: Crystallization forms the basis of gypsum hardening and setting.
Q: The main disadvantage of using amalgam as a restorative material is its unaesthetic metallic appearance
A) Metallic color
B) High cost
C) Unpleasant odor
D) Brittleness
✅ Correct Answer: A
Explanation: Amalgam is strong and durable, but its color does not match natural teeth.
Q: Etching of enamel with phosphoric acid increases surface energy and creates micro-porosities for better bonding
A) Reduces bonding
B) Prevents drying
C) Promotes leakage
D) Enhances retention
✅ Correct Answer: D
Explanation: Acid etching creates a rough surface which improves mechanical bonding.
Q: In glass ionomer cements, fluoride release helps in the prevention of secondary caries around restorations
A) Reduces bond
B) Increases acidity
C) Prevents caries
D) Weakens cement
✅ Correct Answer: C
Explanation: Fluoride release offers long-term protection against bacterial decay.