Dental Materials I → Dentist

#1. Which of the following impression materials can be electroplated without risk of distortion?

Polysulphide

Condensation silicone

Addition silicone

Hydrocolloid impressions

Polyether

#2. The dental amalgam alloys and mercury are mixed in ratio of:

1:1

2:1

1:2

1:3

1:4

#3. Which of the following statements relates best regarding cavity varnish?

Varnishes are synthetic resins dissolved in acetone

Varnishes are calcium hydroxide in a resin base

Varnishes are used to insulate the pulp thermally

Varnishes are used beneath restorative resins to insulate the pulp against chemical irritants

Varnishes are base of ZnO engenol

#4. Cement not irritant to pulpal tissue is.

Calcium hydroxide cement

Silicate cement

Copper cement.

Glass ionomer cement

Resins cement

#5. Stiffness refers to

Resistance to elastic deformation

Degree of elastic deformation

Expandability on heating

Shrinkage on cooling

Expansion on cooling

#6. What are the consequences of prolonged heating of a dental casting investment?

Disintegration of the investment

Rough moulds of investment

Contamination of the alloys

Any of the above

Expansion of alloys

#7. What is trituration

Surface discoloration of metal

Mixing of amalgam alloy with mercury

Same as erosion

Same as corrosion

Mixing of allow particles

#8. The knoop hardness number of which one of the following materials is closest to that of dentin (KHN 65)?

Tooth enamel

Amalgam

Pure Gold

Silicate cement

Dentine

#9. Fillers are added to composite resin to:

Increase working time

Increase coefficient of thermal expansion

Inhibit matrix deformation

B+C

Decrease working time

#10. Cement extensively used for attachment of orthodontic brackets to teeth is.

Silicate cement

Resin cement

Glass ionomer cement

Copper oxide cement

ZnO Eugenol cement.

#11. Which one of the following is the safest and most reliable method of regulating setting time of gypsum products?

Altering the water and powder ratio

Controlling the temperature of water to be used for mixing

Speed of hand spatulation

Length of hand spatulation

Adding salt in mixing

#12. Which part of an amalgam restoration has the highest mercury concentration?

Marginal area

Centre of the restoration

Pulpal area

Proximal surface of restoration

Inclined plane

#13. What is the maximum level of occupational exposure considered safe with regard to mercury vapors?

5 mg of mercury

50 mg of mercury

35 mg of mercury

25 mg of mercury

1 mg of mercury

#14. Most common drawback of amalgam restoration is:

Secondary expansion

Porosity

Marginal break-down

Contraction on setting

Contraction away from margins

#15. Setting expansion of casting investment is approximately:

0.1-0.2%

0.1-0.5%

0.8-1%

1.1-1.7%

1.7%-2%

#16. The main resin constituent of polishable composite resin is:

Polymethymethacrylae

Polycarbonate

Cyanoacrylate

Urethane

Dimethacrylate

#17. KHN of enamel is:

90-100

100.50

300

600

60-90

#18. Regarding dental Amalgam:

It is a mixture of silver alloy and mercury

It is be composed of spherical tin and mercury

It is a mixture of irregular particles of silver and tin

Amalgamation process is formed during heating of silver and mercury

The process of mixing amalgam is called Amalgamation

#19. The cement which has antibacterial property is:

Copper oxide cement

Glass informer cement

Polycarboxylate cement

Zinc phosphate cement

Zinc oxide Eugenol cement

#20. Which of the following impression materials is elastic?

Impression compound

Zinc oxide – Eugenol paste

Wax

Polyether rubber base

Low fusing compound

Dental Materials I

Results

#1. Which of the following impression materials can be electroplated without risk of distortion?

#2. The dental amalgam alloys and mercury are mixed in ratio of:

#3. Which of the following statements relates best regarding cavity varnish?

#4. Cement not irritant to pulpal tissue is.

#5. Stiffness refers to

#6. What are the consequences of prolonged heating of a dental casting investment?

#7. What is trituration

#8. The knoop hardness number of which one of the following materials is closest to that of dentin (KHN 65)?

#9. Fillers are added to composite resin to:

#10. Cement extensively used for attachment of orthodontic brackets to teeth is.

#11. Which one of the following is the safest and most reliable method of regulating setting time of gypsum products?

#12. Which part of an amalgam restoration has the highest mercury concentration?

#13. What is the maximum level of occupational exposure considered safe with regard to mercury vapors?

#14. Most common drawback of amalgam restoration is:

#15. Setting expansion of casting investment is approximately:

#16. The main resin constituent of polishable composite resin is:

#17. KHN of enamel is:

#18. Regarding dental Amalgam:

#19. The cement which has antibacterial property is:

#20. Which of the following impression materials is elastic?

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Dental Materials I

Results

#1. Which of the following impression materials can be electroplated without risk of distortion?

#2. The dental amalgam alloys and mercury are mixed in ratio of:

#3. Which of the following statements relates best regarding cavity varnish?

#4. Cement not irritant to pulpal tissue is.

#5. Stiffness refers to

#6. What are the consequences of prolonged heating of a dental casting investment?

#7. What is trituration

#8. The knoop hardness number of which one of the following materials is closest to that of dentin (KHN 65)?

#9. Fillers are added to composite resin to:

#10. Cement extensively used for attachment of orthodontic brackets to teeth is.

#11. Which one of the following is the safest and most reliable method of regulating setting time of gypsum products?

#12. Which part of an amalgam restoration has the highest mercury concentration?

#13. What is the maximum level of occupational exposure considered safe with regard to mercury vapors?

#14. Most common drawback of amalgam restoration is:

#15. Setting expansion of casting investment is approximately:

#16. The main resin constituent of polishable composite resin is:

#17. KHN of enamel is:

#18. Regarding dental Amalgam:

#19. The cement which has antibacterial property is:

#20. Which of the following impression materials is elastic?

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