Question 1

Noble alloys must have at least 15% noble metal content. Noble content must include gold to be classified.

Accepted Answer

A)   Statement 1 is correct; statement 2 is correct.
B)   Statement 1 is correct; statement 2 is incorrect.
C)   Statement 1 is incorrect; statement 2 is correct.
D)   Statement 1 is incorrect; statement 2 is incorrect.E) All of the above
F) A) and B)

Question 2

Of all the alloys, which alloys are the most difficult to cast and polish?

Accepted Answer

A)   High-noble
B)   Base-metal
C)   Noble gold-based
D)   Noble silver-based
E)   Noble palladium-basedF) A) and C)
G) C) and D)

Question 3

What factors determine the definition of a noble metal?

Accepted Answer

A)   Inability to be used in an alloy
B)   Indistinct melting point
C)   Resistance to corrosion
D)   Lack of malleabilityE) A) and D)
F) None of the above

Question 4

If an alloy contains 40 wt % gold, 20 wt % palladium, 10 wt % platinum, and 30 wt % copper, the nobility would be _____ wt %.

Accepted Answer

A)   10
B)   20
C)   30
D)   40
E)   75F) B) and C)
G) C) and E)

Question 5

Compare and contrast high-noble metals, noble metals, and base metals.

Accepted Answer

High-noble: High-noble alloys are expens...

Question 6

The correct order of firing to create sintered alloy composites is firing 1. of a ceramic that mediates ceramic-alloy bonding.
2)  to create a spongy coping of high-noble metals.
3)  of a lower fusing alloy that is absorbed by capillary action.

Accepted Answer

A)   1, 2, 3
B)   2, 1, 3
C)   3, 1, 2
D)   1, 3, 2
E)   2, 3, 1F) A) and B)
G) B) and D)

Question 7

Which of the following is not an organization that classifies and certifies alloys?

Accepted Answer

A)   American Dental Association
B)   French Institute of Dental Materials
C)   International Standards Organization
D)   All of the above
E)   Only A and CF) A) and E)
G) D) and E)

Question 8

The ________ of an alloy is the mass in grams that occupies a volume of 1 cubic centimeter.

Accepted Answer

A)   area
B)   density
C)   thickness
D)   circumferenceE) B) and D)
F) B) and C)

Question 9

Biocompatibility of dental alloys is often based on _____ of the alloy.

Accepted Answer

A)   long-term contact
B)   combined elements
C)   amount of corrosion
D)   amount of nickel usedE) All of the above
F) B) and C)

Question 10

Which of the following is correct about palladium?

Accepted Answer

A)   Is much harder than gold
B)   Has poor corrosion resistance
C)   Has a much lower melting point than gold
D)   May be used in pure form for dental restorations
E)   Both B and CF) A) and C)
G) C) and D)

Question 11

The ceramic must ________ and bond to the alloy at a temperature below the solidus.

Accepted Answer

A)   liquefy
B)   sinter
C)   melt
D)   flowE) A) and B)
F) A) and C)

Question 12

According to the ADA classification for dental casting alloys, high-noble alloys must have a noble metal content of at least ____% by weight.

Accepted Answer

A)   20
B)   40
C)   60
D)   80
E)   90F) A) and B)
G) A) and C)

Question 13

________ alloys are first cast but then shaped by mechanical force into their final forms.

Accepted Answer

A)   Wrought
B)   Dental casting
C)   Resin composite
D)   Ceramic bondingE) B) and C)
F) A) and D)

Question 14

People are most likely to have an allergic reaction to which of the following base metals used in dentistry?

Accepted Answer

A)   Tin
B)   Nickel
C)   Copper
D)   Titanium
E)   ChromiumF) None of the above
G) A) and C)

Question 15

Which of the following statements is(are)  true of the density of an alloy?

Accepted Answer

A)   The alloy with the highest density weighs the most.
B)   High-density alloys are generally the most difficult to cast.
C)   High-density alloys cost more than low-density alloys, because more mass is present in any given volume of restoration.
D)   A, B, and C are true statements.
E)   A and C are true statements.F) D) and E)
G) B) and E)

Question 16

The color of oxides on metal varies from _________ on high-noble alloys and some noble alloys to _________ oxides on some base-metal alloys.

Accepted Answer

A)   dark gray; dark yellow
B)   light yellow; light gray
C)   light yellow; dark gray
D)   dark gray; light yellowE) A) and B)
F) None of the above

Question 17

When are solders used in dentistry?

Accepted Answer

A)   Clasp wire to a partial denture framework
B)   Orthodontic wire to a band in full treatment
C)   Bond two units of a fixed partial denture together after each is cast separately.
D)   A, B, and C
E)   A and CF) B) and E)
G) D) and E)

Question 18

What are PGP wires used for?

Accepted Answer

A)   Endodontic files
B)   Orthodontic wires
C)   Clasps in removable partial dentures
D)   Substructures for fixed partial denturesE) A) and B)
F) C) and D)

Question 19

High-density alloys are sold by ________ and cost _________ by ________ in any given volume of restoration.

Accepted Answer

A)   grams; less; dose
B)   mass; more; mass
C)   mass; less; dose
D)   grams; less; massE) A) and B)
F) A) and C)

Question 20

Which of the following statements is(are)  true of dental alloy crystal structure and grains?

Accepted Answer

A)   The areas between crystals in an alloy are called grain boundaries.
B)   A large grain size is generally more desirable than a large grain size for dental alloy properties.
C)   If an alloy is rolled into a sheet or drawn into a wire, the grain structure takes on a fibrous appearance.
D)   A, B, and C are correct.
E)   B and C are correct.F) C) and E)
G) B) and C)

Exam 11: Casting Alloys, Wrought Alloys, and Solders

The ________ of an alloy is the mass in grams that occupies a volume of 1 cubic centimeter.

Correct AnswerverifiedShow Answer

Which of the following statements is(are) true of dental alloy crystal structure and grains?

Correct AnswerverifiedShow Answer

Biocompatibility of dental alloys is often based on _____ of the alloy.

Correct AnswerverifiedShow Answer

The ceramic must ________ and bond to the alloy at a temperature below the solidus.

Correct AnswerverifiedShow Answer

Which of the following is correct about palladium?

Correct AnswerverifiedShow Answer

The color of oxides on metal varies from _________ on high-noble alloys and some noble alloys to _________ oxides on some base-metal alloys.

Correct AnswerverifiedShow Answer

Which of the following statements is(are) true of the density of an alloy?

Correct AnswerverifiedShow Answer

________ alloys are first cast but then shaped by mechanical force into their final forms.

Correct AnswerverifiedShow Answer

Noble alloys must have at least 15% noble metal content. Noble content must include gold to be classified.

Correct AnswerverifiedShow Answer

According to the ADA classification for dental casting alloys, high-noble alloys must have a noble metal content of at least ____% by weight.

Correct AnswerverifiedShow Answer

High-density alloys are sold by ________ and cost _________ by ________ in any given volume of restoration.

Correct AnswerverifiedShow Answer

What are PGP wires used for?

Correct AnswerverifiedShow Answer

What factors determine the definition of a noble metal?

Correct AnswerverifiedShow Answer

The correct order of firing to create sintered alloy composites is firing 1. of a ceramic that mediates ceramic-alloy bonding. 2) to create a spongy coping of high-noble metals. 3) of a lower fusing alloy that is absorbed by capillary action.

Correct AnswerverifiedShow Answer

Compare and contrast high-noble metals, noble metals, and base metals.

Correct AnswerverifiedHigh-noble: High-noble alloys are expens...View AnswerShow Answer

Of all the alloys, which alloys are the most difficult to cast and polish?

Correct AnswerverifiedShow Answer

When are solders used in dentistry?

Correct AnswerverifiedShow Answer

Which of the following is not an organization that classifies and certifies alloys?

Correct AnswerverifiedShow Answer

People are most likely to have an allergic reaction to which of the following base metals used in dentistry?

Correct AnswerverifiedShow Answer

If an alloy contains 40 wt % gold, 20 wt % palladium, 10 wt % platinum, and 30 wt % copper, the nobility would be _____ wt %.

Correct AnswerverifiedShow Answer

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The color of oxides on metal varies from _ on high-noble alloys and some noble alloys to _ oxides on some base-metal alloys.

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High-density alloys are sold by ____ and cost _ by ____ in any given volume of restoration.

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High-noble: High-noble alloys are expens...
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