Dental Materials 2

1. Passivating effect is shown by?

Cobalt

Chromium

Nickel

Molybdenum

2. Final finishing of amalgam done after ----hours of finishing?

8 hrs

6 hrs

18 hrs

24 hrs

3. Zinc containing alloys?

Short life span

Long life span

No relation with life span

None

4. Weekest phase in mercury alloy?

Silver Tin

Tin Mercury

Silver Mercury

Option 4

5. Process of heating a metal to reverse the effects associated with cold working?

Hardening

Annealing

Both

None

6. Casting shrinkage of gold alloy is?

Lesser than base metal alloys

Greater than base metal alloys

Neither

Npne

7. Monomer :polymer ratio in heat cured acrylic?

1:3

3:1

1:4

1:1

8. Maximum level of occupational exposure of mercury considered safe?

20 mg/m3

50mg/m3

30 mg/m3

None

9. Tin in amalgam ?

Decreases hardness

Decreases the strength

Increases corrosion

All

10. Low mercury alloy ratio?

Reduces creep

Increases creep

No effect on creep

None

11. Contaminants are removed from the surface of gold foil by

Quenching

Annealing

Hardening

All

12. Ability of a material to sustain a considerable permenant deviation without rupture under compression is called?

Ductility

Modulus of elasticity

Malleability

None

13. Finer grain structure is produced by?

Rapid cooling

Quenching

Both

None

14. Porosity occuring due to premature termination of flow of molten metal during solidification is?

Suck back porosity

Microporosity

Back pressure porosity

Subsurface porosity

15. For NITI wire important features are ?

Pseudoelasticity

Shape memory

Either

None

16. Porosity that occurs due to rapid solidification?

Subsurface porosity

Microporosity

Suck back

Back pressure porosity

17. In electralloy calcium is incorporated for the purpose of ?

Reduce creep

Dispersion strengthening

Age hardening

All

18. Compared to solid solutions eutectic alloys shows?

Increased corrosion resistance

Decreased corrosion resistance

Both are showing same

None

19. Main reason for marginal breakdown of restorations?

Corrosion

Increased porosity

Creep

All

20. Copper in amalgam increases?

Strength

Hardness

Corrosion resistance

Either

Dental Materials 2

1. Passivating effect is shown by?

2.

What first name or nickname would you like us to use?

2. Final finishing of amalgam done after ----hours of finishing?

3. Zinc containing alloys?

4. Weekest phase in mercury alloy?

5. Process of heating a metal to reverse the effects associated with cold working?

6. Casting shrinkage of gold alloy is?

7. Monomer :polymer ratio in heat cured acrylic?

8. Maximum level of occupational exposure of mercury considered safe?

9. Tin in amalgam ?

10. Low mercury alloy ratio?

11. Contaminants are removed from the surface of gold foil by

12. Ability of a material to sustain a considerable permenant deviation without rupture under compression is called?

13. Finer grain structure is produced by?

14. Porosity occuring due to premature termination of flow of molten metal during solidification is?

15. For NITI wire important features are ?

16. Porosity that occurs due to rapid solidification?

17. In electralloy calcium is incorporated for the purpose of ?

18. Compared to solid solutions eutectic alloys shows?

19. Main reason for marginal breakdown of restorations?

20. Copper in amalgam increases?