Dental Materials I → Dentist

#1. Stiffness refers to

Resistance to elastic deformation

Degree of elastic deformation

Expandability on heating

Shrinkage on cooling

Expansion on cooling

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

1:1

2:1

1:2

1:3

1:4

#3. 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

#4. 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

#5. The cement which has antibacterial property is:

Copper oxide cement

Glass informer cement

Polycarboxylate cement

Zinc phosphate cement

Zinc oxide Eugenol cement

#6. 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%

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

Silicate cement

Resin cement

Glass ionomer cement

Copper oxide cement

ZnO Eugenol cement.

#8. 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

#9. Most common drawback of amalgam restoration is:

Secondary expansion

Porosity

Marginal break-down

Contraction on setting

Contraction away from margins

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

Polymethymethacrylae

Polycarbonate

Cyanoacrylate

Urethane

Dimethacrylate

#11. 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

#12. 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

#13. What is trituration

Surface discoloration of metal

Mixing of amalgam alloy with mercury

Same as erosion

Same as corrosion

Mixing of allow particles

#14. KHN of enamel is:

90-100

100.50

300

600

60-90

#15. 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

#16. 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

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

Polysulphide

Condensation silicone

Addition silicone

Hydrocolloid impressions

Polyether

#18. Cement not irritant to pulpal tissue is.

Calcium hydroxide cement

Silicate cement

Copper cement.

Glass ionomer cement

Resins cement

#19. Fillers are added to composite resin to:

Increase working time

Increase coefficient of thermal expansion

Inhibit matrix deformation

B+C

Decrease working time

#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. Stiffness refers to

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

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

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

#5. The cement which has antibacterial property is:

#6. Setting expansion of casting investment is approximately:

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

#8. Regarding dental Amalgam:

#9. Most common drawback of amalgam restoration is:

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

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

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

#13. What is trituration

#14. KHN of enamel is:

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

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

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

#18. Cement not irritant to pulpal tissue is.

#19. Fillers are added to composite resin to:

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

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Dental Materials I

Results

#1. Stiffness refers to

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

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

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

#5. The cement which has antibacterial property is:

#6. Setting expansion of casting investment is approximately:

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

#8. Regarding dental Amalgam:

#9. Most common drawback of amalgam restoration is:

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

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

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

#13. What is trituration

#14. KHN of enamel is:

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

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

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

#18. Cement not irritant to pulpal tissue is.

#19. Fillers are added to composite resin to:

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

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