Question 1

Solders may be used in dentistry to join:

Accepted Answer

A)  an orthodontic wire to a band in construction of a space maintainer. 
B)  a clasp wire to a partial denture framework. 
C)  two units of a fixed partial denture together after each are cast separately. 
D)  A, B, and C. 
E)  A and C. 
A)  an orthodontic wire to a band in construction of a space maintainer. 
B)  a clasp wire to a partial denture framework. 
C)  two units of a fixed partial denture together after each are cast separately. 
D)  A, B, and C. 
E)  A and C. D

Question 2

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

Accepted Answer

A)  density 
B)  area 
C)  circumference 
D)  thickness 
A)  density 
B)  area 
C)  circumference 
D)  thickness A

Question 3

When a molten (liquid)alloy freezes,crystals _____ and _____ as the material cools.

Accepted Answer

A)  dissolve; disperse 
B)  grow; disperse 
C)  form; dissolve 
D)  form; grow 
A)  dissolve; disperse 
B)  grow; disperse 
C)  form; dissolve 
D)  form; grow D

Question 4

Which of the following is a noble metal?

Accepted Answer

A)  Copper 
B)  Palladium 
C)  Nickel 
D)  Zinc 
E)  Titanium 
A)  Copper 
B)  Palladium 
C)  Nickel 
D)  Zinc 
E)  Titanium

Question 5

An alloy liquidus is defined as the temperature at which:

Accepted Answer

A)  an alloy begins to melt. 
B)  all of the alloy melts. 
C)  some of the alloy freezes upon cooling. 
D)  all of the alloy freezes upon cooling. 
A)  an alloy begins to melt. 
B)  all of the alloy melts. 
C)  some of the alloy freezes upon cooling. 
D)  all of the alloy freezes upon cooling.

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, 1 
A)  1, 2, 3 
B)  2, 1, 3 
C)  3, 1, 2 
D)  1, 3, 2 
E)  2, 3, 1

Question 7

The color of an alloy is a good predictor of its composition or other properties.Yellow alloys contain gold.

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. 
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.

Question 8

Pure metals have physical and chemical properties more appropriate to dental applications than alloy metals.Some alloys are formed into restorations by casting.

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. 
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.

Question 9

The temperature at which the entire alloy freezes on cooling is the:

Accepted Answer

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

Question 10

For ceramic-bonding alloys:

Accepted Answer

A)  the solidus of the alloy must be higher than the fusion temperature of the ceramic. 
B)  the solidus of the alloy must be lower than the fusion temperature of the ceramic. 
C)  the coefficient of thermal expansion for the alloy should be less than that of the ceramic. 
D)  both A and C. 
E)  both B and C. 
A)  the solidus of the alloy must be higher than the fusion temperature of the ceramic. 
B)  the solidus of the alloy must be lower than the fusion temperature of the ceramic. 
C)  the coefficient of thermal expansion for the alloy should be less than that of the ceramic. 
D)  both A and C. 
E)  both B and C.

Question 11

Greening of ceramic may be avoided by:

Accepted Answer

A)  selecting an appropriate alloy. 
B)  firing the restoration at the appropriate temperature. 
C)  periodic cleaning of the ceramic oven. 
D)  A, B, and C. 
E)  A and C. 
A)  selecting an appropriate alloy. 
B)  firing the restoration at the appropriate temperature. 
C)  periodic cleaning of the ceramic oven. 
D)  A, B, and C. 
E)  A and C.

Question 12

The best solution to the problem of debonding of ceramic from a ceramic-alloy restoration after cementation in the mouth is to:

Accepted Answer

A)  remove the crown, refire new porcelain to the metal, and then recement the crown. 
B)  refire new porcelain to the metal while the crown remains in the mouth. 
C)  prevent debonding by selection of compatible alloys and ceramics and the proper manipulation of these materials during fabrication. 
D)  bond direct composite to the metal substructure. 
A)  remove the crown, refire new porcelain to the metal, and then recement the crown. 
B)  refire new porcelain to the metal while the crown remains in the mouth. 
C)  prevent debonding by selection of compatible alloys and ceramics and the proper manipulation of these materials during fabrication. 
D)  bond direct composite to the metal substructure.

Question 13

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)  75 
A)  10 
B)  20 
C)  30 
D)  40 
E)  75

Question 14

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 yellow 
A)  dark gray; dark yellow 
B)  light yellow; light gray 
C)  light yellow; dark gray 
D)  dark gray; light yellow

Question 15

Noble alloys must have at least ____% noble metal content but have no stipulation for gold content.

Accepted Answer

A)  10 
B)  15 
C)  20 
D)  25 
E)  30 
A)  10 
B)  15 
C)  20 
D)  25 
E)  30

Question 16

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

Accepted Answer

A)  long-term contact. 
B)  amount of corrosion. 
C)  combined elements. 
D)  amount of nickel used. 
A)  long-term contact. 
B)  amount of corrosion. 
C)  combined elements. 
D)  amount of nickel used.

Question 17

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. 
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.

Question 18

Silver is added to casting alloy to:

Accepted Answer

A)  prevent oxidation. 
B)  enhance bond strength. 
C)  harden the gold. 
D)  prevent tarnish. 
A)  prevent oxidation. 
B)  enhance bond strength. 
C)  harden the gold. 
D)  prevent tarnish.

Question 19

Which of the following statements is true concerning noble and base metals?

Accepted Answer

A)  Seven noble metals are commonly used in dental casting alloys. 
B)  Silver will not corrode in the oral environment. 
C)  The term precious metal is preferred over noble metal. 
D)  Base metals are viewed in dentistry as bad metals and are not used in dental restorations. 
E)  Base metals are required in dental alloys for strength, flexibility, and wear resistance. 
A)  Seven noble metals are commonly used in dental casting alloys. 
B)  Silver will not corrode in the oral environment. 
C)  The term precious metal is preferred over noble metal. 
D)  Base metals are viewed in dentistry as bad metals and are not used in dental restorations. 
E)  Base metals are required in dental alloys for strength, flexibility, and wear resistance.

Question 20

Gold is used in dental alloys primarily because of:

Accepted Answer

A)  its resistance to corrosion. 
B)  its relatively high melting point. 
C)  its yellow color. 
D)  A, B, and C. 
E)  A and C. 
A)  its resistance to corrosion. 
B)  its relatively high melting point. 
C)  its yellow color. 
D)  A, B, and C. 
E)  A and C.

Solders may be used in dentistry to join:

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

When a molten (liquid)alloy freezes,crystals _ and _ as the material cools.

Which of the following is a noble metal?

An alloy liquidus is defined as the temperature at which:

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.

The color of an alloy is a good predictor of its composition or other properties.Yellow alloys contain gold.

Pure metals have physical and chemical properties more appropriate to dental applications than alloy metals.Some alloys are formed into restorations by casting.

The temperature at which the entire alloy freezes on cooling is the:

For ceramic-bonding alloys:

Greening of ceramic may be avoided by:

The best solution to the problem of debonding of ceramic from a ceramic-alloy restoration after cementation in the mouth is to:

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

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

Noble alloys must have at least ____% noble metal content but have no stipulation for gold content.

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

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

Silver is added to casting alloy to:

Which of the following statements is true concerning noble and base metals?

Gold is used in dental alloys primarily because of:

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

Solders may be used in dentistry to join:

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

When a molten (liquid)alloy freezes,crystals _____ and _____ as the material cools.

Which of the following is a noble metal?

An alloy liquidus is defined as the temperature at which:

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.

The color of an alloy is a good predictor of its composition or other properties.Yellow alloys contain gold.

Pure metals have physical and chemical properties more appropriate to dental applications than alloy metals.Some alloys are formed into restorations by casting.

The temperature at which the entire alloy freezes on cooling is the:

For ceramic-bonding alloys:

Greening of ceramic may be avoided by:

The best solution to the problem of debonding of ceramic from a ceramic-alloy restoration after cementation in the mouth is to:

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

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

Noble alloys must have at least ____% noble metal content but have no stipulation for gold content.

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

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

Silver is added to casting alloy to:

Which of the following statements is true concerning noble and base metals?

Gold is used in dental alloys primarily because of:

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

When a molten (liquid)alloy freezes,crystals _ and _ as the material cools.

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