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DMS > 2015 > Flashcards

2015 Flashcards

1
Q

Which of the following is a hydrocolloid?
A. Alginate
B. Polyether

A

A. Alginate

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2
Q

Which impression material is a reversible hydrocolloid?
A. Agar
B. Alginate

A

A. Agar

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3
Q

When making alginate impression, what is formed in gelation?
A. Calcium alginate
B. Potassium alginate

A

A. Calcium alginate

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4
Q

What is the accelerator for polysulfides?
A. Lead dioxide
B. Platinum

A

A. Lead dioxide

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5
Q

Which of the following causes shrinkage of hydrocolloids?
A. Imbibition

B. Syneresis

A

B. Syneresis

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6
Q

Contamination by sulfur from latex gloves inhibits the polymerization of which impression material?
A. Addition silicone
B. Polyether

A

A. Addition silicone

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7
Q

Which type of gypsum products is produced by steam and pressure?
A. Alpha hemihydrate
B. Beta hemihydrate
C. Densite

A

A. Alpha hemihydrate

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8
Q

Which type of gypsum is used for making diagnostic cast?
A. Type III
B. Type IV
C. Type II

A

A. Type III

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9
Q

Which stone has the highest compressive strength?
A. Type III

B. Type IV

C. Type II

A

B. Type IV

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10
Q

Which of the following is the most important as a manipulative factor of gypsum?
A. W\P ratio
B. Spatulation time
C. Vacuum mixing

A

A. W\P ratio

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11
Q

Which factor is the most important in setting expansion?
A. High w/p ratio

B. Crystals growth impinge upon each other exerting outward forces

A

B. Crystals growth impinge upon each other exerting outward forces

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12
Q

What will increase the compressive strength of gypsum?
A. Increase water content

B. Decrease water content

A

B. Decrease water content

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13
Q

What is the main constituent of inlay wax?
A. Bee wax

B. Parrafin

C. Candilila

A

B. Parrafin


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14
Q

Why is porosity needed in an investment material?
A. To allow air or gas to enter during casting

B. To allow air/gas to escape during casting

C. To allow the investment material to cool after casting

A


B. To allow air/gas to escape during casting


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15
Q

The amount of permanent deformation equals its elastic recovery. Permanent deformation depends on percent compression, time under compression, and time after removal of the compressive load.

A. Both statements are true

B. Both statements are false
C. The first statement is false; the second statement is correct
D. None of the above

A

C. The first statement is false; the second statement is correct

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16
Q

Compared to phosphate bonded investments, gypsum bonded investments are used for
A. Casting high melting point alloys

B. Limited to gold castings

A

B. Limited to gold castings

17
Q

Which investment material is used to fabricate partial removable denture framework? A. Gypsum-bonded investment
B. Phosphate-bonded investment

C. Silica-bonded investment

A

B. Phosphate-bonded investment


18
Q

Which of the following statements regarding metal grains is true?

A. Slow cooling helps form more grains

B. Seeding a melt in foreign body particles helps in decreasing grain size

A

B. Seeding a melt in foreign body particles helps in decreasing grain size

19
Q

When there is increased supercooling, the critical radius size of nuclei is?
A. Increased
B. Decreased

A

B. Decreased

20
Q

Which of the following is used for heterogeneous nucleation?
A. Iridium

A

A. Iridium

21
Q

If a dental gold alloys of 1040􏰀C is poured in a cylindrical cast of 590􏰀C, the first solid form will:
A. Consist of small grains
B. Consist of dendritic shaped grains

A

A. consist of small grains

22
Q

According to Hall-Petch theory, the yield strength is directly proportional to the diameter of the grains
A. True

B. False

A

B) False

23
Q 
Which of the following doesn't change after cold orking
A. Elastic modulus 
B. Ductility

C. Hardness

D. Proportional limit
A

A. Elastic modulus

24
Q

What occurs during the second stage of annealing?
A. Stress released

B. Nucleation of new grains

C. Strength and hardness return to near values before cold working
D. Both b and c

A

D. Both b and c

25
Q 
An alloy of 70%Au is poured then immediately quenched after, what properties would it have? 
A. Soft and ductile

B. Hard and brittle
C. Has a lot of ordered solid solutions 
D. Has a lot of random solid solutions 
E. Both A and D
A

E. Both A and D

DMS (3 decks)

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