Question 1

What regulates the amount of thermal expansion of the investment?

Accepted Answer

A)  Temperature used during burnout 
B)  Type of silica refractory used 
C)  Type of inlay wax used 
D)  A and B 
E)  B and C 
A)  Temperature used during burnout 
B)  Type of silica refractory used 
C)  Type of inlay wax used 
D)  A and B 
E)  B and C D

Question 2

To prevent premature freezing in the sprue channel, sprues are generally as _____ in diameter and as _____ as possible.

Accepted Answer

A)  small; long 
B)  small; short 
C)  large; long 
D)  large; short 
A)  small; long 
B)  small; short 
C)  large; long 
D)  large; short D

Question 3

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

Accepted Answer

A)  500° F higher 
B)  500° C higher 
C)  500° F lower 
D)  500° C lower 
A)  500° F higher 
B)  500° C higher 
C)  500° F lower 
D)  500° C lower B

Question 4

Which term refers to rapidly cooling a casting in cold water?

Accepted Answer

A)  Brazing 
B)  Pickling 
C)  Quenching 
D)  Bench cooling 
A)  Brazing 
B)  Pickling 
C)  Quenching 
D)  Bench cooling

Question 5

What will occur if the molten metal and the investment material are too far apart in temperature?

Accepted Answer

A)  The metal will solidify too quickly. 
B)  There will be too much shrinkage. 
C)  The investment will crack. 
D)  The metal will crack. 
A)  The metal will solidify too quickly. 
B)  There will be too much shrinkage. 
C)  The investment will crack. 
D)  The metal will crack.

Question 6

Which factor below does not determine the type of flux used during dental castings?

Accepted Answer

A)  Type of heat source used to melt the alloy 
B)  Liquidus of the casting alloy 
C)  Type of casting alloy 
D)  Type of investment 
E)  Type of wax 
A)  Type of heat source used to melt the alloy 
B)  Liquidus of the casting alloy 
C)  Type of casting alloy 
D)  Type of investment 
E)  Type of wax

Question 7

How are casting metals melted?

Accepted Answer

A)  A blowtorch 
B)  A casting oven 
C)  An electric current 
D)  Only A and B are correct. 
E)  Only A and C are correct. 
A)  A blowtorch 
B)  A casting oven 
C)  An electric current 
D)  Only A and B are correct. 
E)  Only A and C are correct.

Question 8

Depending on ______________, the required temperature of a burnout oven for proper casting will vary.

Accepted Answer

A)  type of investment 
B)  liquidus of the alloy to be cast 
C)  solidus of the alloy to be cast 
D)  A, B, and C are all correct. 
E)  Only A and B are correct. 
A)  type of investment 
B)  liquidus of the alloy to be cast 
C)  solidus of the alloy to be cast 
D)  A, B, and C are all correct. 
E)  Only A and B are correct.

Question 9

Which is the correct order of operations to construct a cast appliance?

Accepted Answer

A)  Wax pattern, investment, sprue, burnout, cast 
B)  Investment, wax pattern, sprue, cast, burnout 
C)  Wax pattern, sprue, cast, burnout, investment 
D)  Wax pattern, sprue, investment, burnout, cast 
A)  Wax pattern, investment, sprue, burnout, cast 
B)  Investment, wax pattern, sprue, cast, burnout 
C)  Wax pattern, sprue, cast, burnout, investment 
D)  Wax pattern, sprue, investment, burnout, cast

Question 10

Why is a surfactant used prior to investment?

Accepted Answer

A)  Wet the ceramic-paper liner 
B)  Liquefy the investment material 
C)  Reduce residual stress in the wax pattern 
D)  Aid the flow of the investment material over the wax pattern 
A)  Wet the ceramic-paper liner 
B)  Liquefy the investment material 
C)  Reduce residual stress in the wax pattern 
D)  Aid the flow of the investment material over the wax pattern

Question 11

The investment used in casting is ________; the wax pattern is __________.

Accepted Answer

A)  hydrophobic; hydrophobic 
B)  hydrophobic; hydrophilic 
C)  hydrophilic; hydrophilic 
D)  hydrophilic; hydrophobic 
A)  hydrophobic; hydrophobic 
B)  hydrophobic; hydrophilic 
C)  hydrophilic; hydrophilic 
D)  hydrophilic; hydrophobic

Question 12

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

Accepted Answer

A)  1 
B)  0.5 
C)  0.1 
D)  0.05 
E)  0.01 
A)  1 
B)  0.5 
C)  0.1 
D)  0.05 
E)  0.01

Question 13

What will occur if base-metal castings are pickled?

Accepted Answer

A)  Tarnish 
B)  Oxidation 
C)  Corrosion 
D)  Crystallization 
A)  Tarnish 
B)  Oxidation 
C)  Corrosion 
D)  Crystallization

Question 14

Which of the following is an advantage to using wax when constructing an indirect restoration?

Accepted Answer

A)  Flows easily 
B)  Releases stress 
C)  Does not distort 
D)  May be formed on the tooth 
A)  Flows easily 
B)  Releases stress 
C)  Does not distort 
D)  May be formed on the tooth

Question 15

Which of the following will flux minimize?

Accepted Answer

A)  Oxidation 
B)  Melting time 
C)  Freezing time 
D)  Melting temperature 
A)  Oxidation 
B)  Melting time 
C)  Freezing time 
D)  Melting temperature

Question 16

Explain the advantages and disadvantages of using inlay wax to construct an indirect restoration.

Accepted Answer

Wax is used because it is easy to manipu

Question 17

Once a molten alloy freezes, what is the percentage of shrinkage that may occur?

Accepted Answer

A)  0.5% to 1.0% 
B)  1.0% to 2.5% 
C)  1.5% to 2.0% 
D)  1.2% to 2.5% 
A)  0.5% to 1.0% 
B)  1.0% to 2.5% 
C)  1.5% to 2.0% 
D)  1.2% to 2.5%

Question 18

Which characteristics are necessary for a blowtorch to heat casting alloys?

Accepted Answer

A)  May operate on a combination of natural gas and compressed air for low-temperature alloys 
B)  May operate on a combination of natural gas and oxygen for higher temperature alloys 
C)  Must heat the alloy sufficiently to ensure a low viscosity of the alloy for casting 
D)  A, B, and C 
E)  A and C 
A)  May operate on a combination of natural gas and compressed air for low-temperature alloys 
B)  May operate on a combination of natural gas and oxygen for higher temperature alloys 
C)  Must heat the alloy sufficiently to ensure a low viscosity of the alloy for casting 
D)  A, B, and C 
E)  A and C

Question 19

Most dental solders are silver or gold alloys. Only certain types of alloy solders require flux.

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 20

Investment is retained in a __________ while it sets.

Accepted Answer

A)  mold 
B)  crucible 
C)  centrifuge 
D)  casting ring 
A)  mold 
B)  crucible 
C)  centrifuge 
D)  casting ring

What regulates the amount of thermal expansion of the investment?

To prevent premature freezing in the sprue channel, sprues are generally as _ in diameter and as _ as possible.

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

Which term refers to rapidly cooling a casting in cold water?

What will occur if the molten metal and the investment material are too far apart in temperature?

Which factor below does not determine the type of flux used during dental castings?

How are casting metals melted?

Depending on ______________, the required temperature of a burnout oven for proper casting will vary.

Which is the correct order of operations to construct a cast appliance?

Why is a surfactant used prior to investment?

The investment used in casting is ; the wax pattern is __.

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

What will occur if base-metal castings are pickled?

Which of the following is an advantage to using wax when constructing an indirect restoration?

Which of the following will flux minimize?

Explain the advantages and disadvantages of using inlay wax to construct an indirect restoration.

Once a molten alloy freezes, what is the percentage of shrinkage that may occur?

Which characteristics are necessary for a blowtorch to heat casting alloys?

Most dental solders are silver or gold alloys. Only certain types of alloy solders require flux.

Investment is retained in a __________ while it sets.

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 Alloys, Wrought Alloys, and Solders

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 12: Casting, Soldering, and Welding

What regulates the amount of thermal expansion of the investment?

To prevent premature freezing in the sprue channel, sprues are generally as _____ in diameter and as _____ as possible.

It is important that the temperature of the molten metal not be more than ________ than the burned out investment.

Which term refers to rapidly cooling a casting in cold water?

What will occur if the molten metal and the investment material are too far apart in temperature?

Which factor below does not determine the type of flux used during dental castings?

How are casting metals melted?

Depending on ______________, the required temperature of a burnout oven for proper casting will vary.

Which is the correct order of operations to construct a cast appliance?

Why is a surfactant used prior to investment?

The investment used in casting is ________; the wax pattern is __________.

The accuracy of a cast crown may be as good as ____% in dimensional change from the wax pattern if care is taken to perform each step properly.

What will occur if base-metal castings are pickled?

Which of the following is an advantage to using wax when constructing an indirect restoration?

Which of the following will flux minimize?

Explain the advantages and disadvantages of using inlay wax to construct an indirect restoration.

Once a molten alloy freezes, what is the percentage of shrinkage that may occur?

Which characteristics are necessary for a blowtorch to heat casting alloys?

Most dental solders are silver or gold alloys. Only certain types of alloy solders require flux.

Investment is retained in a __________ while it sets.

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 Alloys, Wrought Alloys, and Solders

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

To prevent premature freezing in the sprue channel, sprues are generally as _ in diameter and as _ as possible.

The investment used in casting is ; the wax pattern is __.