Question 1

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

Accepted Answer

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

Question 2

The temperature at which an alloy melts completely is its:

Accepted Answer

A)  flow. 
B)  liquidus. 
C)  solidus. 
D)  viscosity. 
A)  flow. 
B)  liquidus. 
C)  solidus. 
D)  viscosity.

Question 3

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 small 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 true statements. 
E)  A and C are true statements. 
A)  The areas between crystals in an alloy are called grain boundaries. 
B)  A small 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 true statements. 
E)  A and C are true statements.

Question 4

PGP wires are used for:

Accepted Answer

A)  orthodontic wires. 
B)  endodontic files. 
C)  clasps in removable partial dentures. 
D)  substructures for fixed partial dentures. 
A)  orthodontic wires. 
B)  endodontic files. 
C)  clasps in removable partial dentures. 
D)  substructures for fixed partial dentures.

Question 5

_____ alloys are the most difficult to cast and polish of all the alloys.

Accepted Answer

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

Question 6

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)  90 
A)  20 
B)  40 
C)  60 
D)  80 
E)  90

Question 7

Wrought alloys have a grain structure often described as fibrous.The fibrous structure is responsible for increased yield strength and hardness compared with the cast form of the alloys.

Accepted Answer

A)  Both statements are true. 
B)  Both statements are false. 
C)  The first statement is true; the second statement is false. 
D)  The first statement is false; the second statement is true. 
A)  Both statements are true. 
B)  Both statements are false. 
C)  The first statement is true; the second statement is false. 
D)  The first statement is false; the second statement is true.

Question 8

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

Accepted Answer

A)  Dental casting 
B)  Wrought 
C)  Ceramic bonding 
D)  Resin composite 
A)  Dental casting 
B)  Wrought 
C)  Ceramic bonding 
D)  Resin composite

Question 9

The stress required to permanently distort an alloy is the:

Accepted Answer

A)  strength. 
B)  yield strength. 
C)  hardness. 
D)  modulus. 
A)  strength. 
B)  yield strength. 
C)  hardness. 
D)  modulus.

Question 10

Noble metals are defined by their:

Accepted Answer

A)  resistance to corrosion. 
B)  inability to be used in an alloy. 
C)  indistinct melting point. 
D)  lack of malleability. 
A)  resistance to corrosion. 
B)  inability to be used in an alloy. 
C)  indistinct melting point. 
D)  lack of malleability.

Question 11

Palladium:

Accepted Answer

A)  has poor corrosion resistance. 
B)  has a much lower melting point than gold. 
C)  is much harder than gold. 
D)  may be used in pure form for dental restorations. 
E)  both B and C. 
A)  has poor corrosion resistance. 
B)  has a much lower melting point than gold. 
C)  is much harder than gold. 
D)  may be used in pure form for dental restorations. 
E)  both B and C.

Question 12

Common base metals used in dentistry include:

Accepted Answer

A)  gold. 
B)  silver. 
C)  platinum. 
D)  palladium. 
A)  gold. 
B)  silver. 
C)  platinum. 
D)  palladium.

Question 13

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

Accepted Answer

A)  liquefy 
B)  melt 
C)  flow 
D)  sinter 
A)  liquefy 
B)  melt 
C)  flow 
D)  sinter

Question 14

Solder metals usually rely on _____ to encourage a lower melting temperature of the solder.

Accepted Answer

A)  tin 
B)  copper 
C)  titanium 
D)  nickel 
A)  tin 
B)  copper 
C)  titanium 
D)  nickel

Question 15

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

Accepted Answer

A)  Copper 
B)  Nickel 
C)  Tin 
D)  Titanium 
E)  Chromium 
A)  Copper 
B)  Nickel 
C)  Tin 
D)  Titanium 
E)  Chromium

Question 16

Which of the following is not considered a noble metal in dentistry?

Accepted Answer

A)  Gold 
B)  Silver 
C)  Platinum 
D)  Palladium 
A)  Gold 
B)  Silver 
C)  Platinum 
D)  Palladium

Question 17

Malleability is defined as:

Accepted Answer

A)  the ability to be drawn into a wire. 
B)  the ability to be mechanically formed. 
C)  tarnish resistance. 
D)  corrosion resistance. 
A)  the ability to be drawn into a wire. 
B)  the ability to be mechanically formed. 
C)  tarnish resistance. 
D)  corrosion resistance.

Question 18

Dental alloys have a crystal structure like ice,salt,or sugar.These crystals,or _____ as they are called in metallurgy,can be seen clearly under a microscope.

Accepted Answer

A)  granules 
B)  gradations 
C)  grains 
D)  lattice 
A)  granules 
B)  gradations 
C)  grains 
D)  lattice

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

The temperature at which an alloy melts completely is its:

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

PGP wires are used for:

_____ alloys are the most difficult to cast and polish of all the alloys.

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

Wrought alloys have a grain structure often described as fibrous.The fibrous structure is responsible for increased yield strength and hardness compared with the cast form of the alloys.

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

The stress required to permanently distort an alloy is the:

Noble metals are defined by their:

Palladium:

Common base metals used in dentistry include:

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

Solder metals usually rely on _____ to encourage a lower melting temperature of the solder.

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

Which of the following is not considered a noble metal in dentistry?

Malleability is defined as:

Dental alloys have a crystal structure like ice,salt,or sugar.These crystals,or _____ as they are called in metallurgy,can be seen clearly under a microscope.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting and Soldering

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 11: Casting Alloys, wrought Alloys, and Solders

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

The temperature at which an alloy melts completely is its:

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

PGP wires are used for:

_____ alloys are the most difficult to cast and polish of all the alloys.

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

Wrought alloys have a grain structure often described as fibrous.The fibrous structure is responsible for increased yield strength and hardness compared with the cast form of the alloys.

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

The stress required to permanently distort an alloy is the:

Noble metals are defined by their:

Palladium:

Common base metals used in dentistry include:

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

Solder metals usually rely on _____ to encourage a lower melting temperature of the solder.

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

Which of the following is not considered a noble metal in dentistry?

Malleability is defined as:

Dental alloys have a crystal structure like ice,salt,or sugar.These crystals,or _____ as they are called in metallurgy,can be seen clearly under a microscope.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, polishing, and Cleansing Materials

Cements

Impression Materials

Model and Die Materials

Waxes

Casting and Soldering

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters