11. Which one of the following dental cement accelerates the formation of reparative dentin ?
A. Eugenol
B. Calcium Hydroxide
C. Zinc oxide
D. Silica
✅ The correct answer is option B. Calcium Hydroxide.
Dental Materials
12. The higher the Hg alloy ratio in dental amalgam________________?
A. Higher the strength
B. Lower the creep value
C. More matrix matrial formed
D. More gamma 1 phase formed
✅ The correct answer is option C. More matrix matrial formed.
13. The most toxic form of mercury is_________________?
A. Methyl and ethyl mercury
B. Mercury vapour
C. Inorganic mercury forms
D. Mercury sulphide
✅ The correct answer is option A. Methyl and ethyl mercury.
14. Amalgam restorations give the best clinical service when the residual mercury content is_______________?
A. 38-42%
B. 48-52%
C. 58-62%
D. 68-72%
✅ The correct answer is option B. 48-52%.
15. The term trituration means____________?
A. Lysing amalgam alloy
B. Mixing of amalgam alloy and mercury
C. Removal of excess of mercury
D. None of the above
✅ The correct answer is option B. Mixing of amalgam alloy and mercury.
16. Fluoride rich materials include ?
A. Silicate cement
B. Glass ionomer cement
C. Polycarboxylate cement
D. All of the above
✅ The correct answer is option D. All of the above.
17. Strength of zinc phosphate is effected by_______________?
A. Temp of glass slab
B. P:L ratio
C. Consistency of mix
D. Alteration of mixing time
✅ The correct answer is option B. P:L ratio.
18. Copper content in low copper amalgam is________________?
A. 6%
B. 12-30%
C. 29%
D. 19%
✅ The correct answer is option A. 6%.
19. When porcelain is basked against metal, it should possess a________________?
A. high fusion expansion
B. high fusion temperature
C. linear coefficient of thermal expansion less than but close to that of metal
D. Linear coefficient of thermal expansion greater than, but close to that of the metal
✅ The correct answer is option C. linear coefficient of thermal expansion less than but close to that of metal.
20. Which of the following cements is most kind to pulp ?
A. Glass ionomer
B. Polycarboxylate
C. Silicate
D. Resin cement
✅ The correct answer is option B. Polycarboxylate.