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.Management Sciences
Category: Dental Materials
Which of the following cements bonds to tooth structure, which has an anticariogenic effect, has a degree of translucency and does not irritate the pulp ?
A. Polycarboxylate cement
B. Resin cement
C. Silicate cement
D. Glass ionomer cement
A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have________________?
A. Greater ductility
B. Greater toughness
C. A higher modulus of elasticity
D. A higher modulus of elasticity
E. More resistance to permanent deformation
Gypsum bonded investment should not be heated over______________?
A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C
Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?
A. Biological properties
B. Thermal properties
C. Mechanical properties
D. Esthetic properties
Dimensional stability of hydrocolloid impressions may be achieved by_________________?
A. Using less water powder ratio
B. Storing the impression under water
C. Prolonged manipulation
D. Using humidor
Investment material used for cobalt-chromium alloys is_____________?
A. Gypsum bonded
B. Phosphate bonded
C. Silica bonded
D. None of the above
All of the following are true for traditional solution liner, except_________________?
A. It is not necessary in moderately deep cavities under glass ionomer restoration
B. Have Film thickness of 1 – 50 microns
C. Do not provide thermal or electric insulation
D. Protect the pulp from reaction products leaching out of restoration
What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
A. 6%
B. 8%
C. 10%
D. 21%
Elastomers except: Polyether are_______________?
A. Hydrophilic
B. Hydrophobic
C. Water loving impression materials
D. Potassium alginates
Air bubbles formed on the surface of casting is probably due to________________?
A. Improper casting pressure
B. Improper heating of the investment
C. Improper angulation of sprue
D. Improper wetting of the wax pattern by the investment
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