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 role of silane coupling agent in composite resin materials is to enhance the bond between the resin and the filler particles
A) Increase color
B) Reduce wear
C) Strengthen filler
D) Bond filler to resin
✅ Correct Answer: D
Explanation: Silane chemically links inorganic filler and organic resin matrix.
Q: For accurate reproduction of oral tissues, elastomeric impression materials like addition silicone are highly preferred in fixed prosthodontics
A) Addition silicone
B) Plaster
C) Reversible hydrocolloid
D) ZOE
✅ Correct Answer: A
Explanation: Addition silicones are dimensionally stable and precise.
Q: The setting reaction of polycarboxylate cement involves chelation of carboxyl groups with calcium ions in tooth structure
A) Ionic bonding
B) Mechanical retention
C) Hydrogen bonding
D) Covalent bonding
✅ Correct Answer: A
Explanation: Ionic interaction ensures chemical adhesion to enamel and dentin.
Q: Increased powder-to-liquid ratio in dental cements generally results in higher strength and lower solubility
A) Increases porosity
B) Weakens cement
C) Slows setting
D) Improves strength
✅ Correct Answer: D
Explanation: More powder leads to a denser and stronger set cement.
Q: Compressive strength of dental materials is particularly important for posterior restorations that endure heavy masticatory forces
A) Compressive resistance
B) Solubility
C) Thermal expansion
D) Aesthetic value
✅ Correct Answer: A
Explanation: Posterior teeth need materials that can resist crushing forces.