Question 1

Which of the following types of dental stone and dental plaster requires the least amount of excess water?

Accepted Answer

A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone 
A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone

Question 2

The initial setting time for gypsum is defined as the time the:

Accepted Answer

A)  powder is added to the water until mixing is complete. 
B)  powder is added to the water until the pour is complete. 
C)  pour begins until the pour is complete. 
D)  powder is added to the water until the material cannot be used. 
A)  powder is added to the water until mixing is complete. 
B)  powder is added to the water until the pour is complete. 
C)  pour begins until the pour is complete. 
D)  powder is added to the water until the material cannot be used.

Question 3

Water-powder ratio is defined as the amount of water in _____ added to the amount of powder in _____.

Accepted Answer

A)  ounces; ounces 
B)  milliliters; ounces 
C)  ounces; grams 
D)  milliliters; grams 
A)  ounces; ounces 
B)  milliliters; ounces 
C)  ounces; grams 
D)  milliliters; grams

Question 4

If gypsum materials are not adequately spatulated,_____ suffers.

Accepted Answer

A)  accuracy 
B)  dimensional change 
C)  strength 
D)  abrasion resistance 
A)  accuracy 
B)  dimensional change 
C)  strength 
D)  abrasion resistance

Question 5

Which of the following materials will accelerate the setting reaction of gypsum products?

Accepted Answer

A)  Blood 
B)  Saliva 
C)  Agar 
D)  Terra alba 
E)  Unset alginate 
A)  Blood 
B)  Saliva 
C)  Agar 
D)  Terra alba 
E)  Unset alginate

Question 6

Which form of dental gypsum product is created by boiling gypsum in a 30% solution of calcium chloride?

Accepted Answer

A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone 
D)  A and B 
E)  B and C 
A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone 
D)  A and B 
E)  B and C

Question 7

Using excessive water to prepare gypsum materials will result in:

Accepted Answer

A)  a reduction in the setting time. 
B)  a reduction in strength. 
C)  increased setting expansion. 
D)  A, B, and C. 
E)  A and C. 
A)  a reduction in the setting time. 
B)  a reduction in strength. 
C)  increased setting expansion. 
D)  A, B, and C. 
E)  A and C.

Question 8

Casts of teeth are used to make:

Accepted Answer

A)  crowns. 
B)  inlays. 
C)  retainers. 
D)  all of the above. 
A)  crowns. 
B)  inlays. 
C)  retainers. 
D)  all of the above.

Question 9

Which of the following statements is true of the compressive strengths of gypsum materials?

Accepted Answer

A)  Die stone has the lowest compressive strength, because it has the least excess water. 
B)  Die stone has the lowest compressive strength, because it has the most excess water. 
C)  Die stone is almost 4 times as strong in compression as plaster, because the excess water is minimized. 
D)  Die stone is almost 4 times as strong in compression as plaster, because the excess water is maximized. 
A)  Die stone has the lowest compressive strength, because it has the least excess water. 
B)  Die stone has the lowest compressive strength, because it has the most excess water. 
C)  Die stone is almost 4 times as strong in compression as plaster, because the excess water is minimized. 
D)  Die stone is almost 4 times as strong in compression as plaster, because the excess water is maximized.

Question 10

If a 2% solution of borax is added to the gypsum powder,what will be the result? The setting time will be:

Accepted Answer

A)  reduced significantly. 
B)  reduced slightly. 
C)  extended significantly. 
D)  extended slightly. 
A)  reduced significantly. 
B)  reduced slightly. 
C)  extended significantly. 
D)  extended slightly.

Question 11

Orthodontic plaster is a mixture of:

Accepted Answer

A)  impression plaster and model plaster. 
B)  model plaster and dental stone. 
C)  impression plaster and dental stone. 
D)  high-strength/low-expansion and high-strength/high-expansion dental stone. 
A)  impression plaster and model plaster. 
B)  model plaster and dental stone. 
C)  impression plaster and dental stone. 
D)  high-strength/low-expansion and high-strength/high-expansion dental stone.

Question 12

When a model or die is wet,its compressive and tensile strength is approximately _____ its strength when dry.

Accepted Answer

A)  4 times 
B)  twice 
C)  one-half 
D)  one-quarter 
E)  one-sixteenth 
A)  4 times 
B)  twice 
C)  one-half 
D)  one-quarter 
E)  one-sixteenth

Question 13

A hemihydrate will not set if the:

Accepted Answer

A)  body temperature is above 37.5° 
B)  body temperature is below 37.5° 
C)  mixing water reaches 100° C. 
A)  body temperature is above 37.5° 
B)  body temperature is below 37.5° 
C)  mixing water reaches 100° C.

Question 14

Which of the following types of gypsum products is also known as die stone?

Accepted Answer

A)  Impression plaster 
B)  Model plaster 
C)  Dental stone 
D)  High-strength/low-expansion dental stone 
E)  High-strength/high-expansion dental stone 
A)  Impression plaster 
B)  Model plaster 
C)  Dental stone 
D)  High-strength/low-expansion dental stone 
E)  High-strength/high-expansion dental stone

Question 15

Which of the following model and die materials are derived from the mineral gypsum?

Accepted Answer

A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone 
D)  A, B, and C 
E)  A and C 
A)  Model plaster 
B)  Dental stone 
C)  High-strength dental stone 
D)  A, B, and C 
E)  A and C

Question 16

When powder and water are added to the mixing bowl:

Accepted Answer

A)  powder should be added first. 
B)  water should be added first. 
C)  the second material added should be sprinkled in slowly over a period of about 30 seconds. 
D)  both A and C. 
E)  both B and C. 
A)  powder should be added first. 
B)  water should be added first. 
C)  the second material added should be sprinkled in slowly over a period of about 30 seconds. 
D)  both A and C. 
E)  both B and C.

Question 17

_____ are highly accurate replicas of a single tooth and generally are used to make metal crowns or inlays.

Accepted Answer

A)  Models 
B)  Casts 
C)  Dies 
D)  A and C 
E)  B and C 
A)  Models 
B)  Casts 
C)  Dies 
D)  A and C 
E)  B and C

Question 18

The _____ and _____ dense the crystal of the hemihydrate,the less excess water required to get a workable mass.

Accepted Answer

A)  larger; more 
B)  larger; less 
C)  smaller; more 
D)  smaller; less 
A)  larger; more 
B)  larger; less 
C)  smaller; more 
D)  smaller; less

Question 19

The impression should not be removed from the gypsum for _____ minutes.

Accepted Answer

A)  3 to 5 
B)  5 to 10 
C)  10 to 20 
D)  20 to 40 
E)  45 to 60 
A)  3 to 5 
B)  5 to 10 
C)  10 to 20 
D)  20 to 40 
E)  45 to 60

Which of the following types of dental stone and dental plaster requires the least amount of excess water?

The initial setting time for gypsum is defined as the time the:

Water-powder ratio is defined as the amount of water in _ added to the amount of powder in _.

If gypsum materials are not adequately spatulated,_____ suffers.

Which of the following materials will accelerate the setting reaction of gypsum products?

Which form of dental gypsum product is created by boiling gypsum in a 30% solution of calcium chloride?

Using excessive water to prepare gypsum materials will result in:

Casts of teeth are used to make:

Which of the following statements is true of the compressive strengths of gypsum materials?

If a 2% solution of borax is added to the gypsum powder,what will be the result? The setting time will be:

Orthodontic plaster is a mixture of:

When a model or die is wet,its compressive and tensile strength is approximately _____ its strength when dry.

A hemihydrate will not set if the:

Which of the following types of gypsum products is also known as die stone?

Which of the following model and die materials are derived from the mineral gypsum?

When powder and water are added to the mixing bowl:

_____ are highly accurate replicas of a single tooth and generally are used to make metal crowns or inlays.

The _ and _ dense the crystal of the hemihydrate,the less excess water required to get a workable mass.

The impression should not be removed from the gypsum for _____ minutes.

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

Waxes

Casting Alloys, wrought Alloys, and Solders

Casting and Soldering

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 9: Model and Die Materials

Which of the following types of dental stone and dental plaster requires the least amount of excess water?

The initial setting time for gypsum is defined as the time the:

Water-powder ratio is defined as the amount of water in _____ added to the amount of powder in _____.

If gypsum materials are not adequately spatulated,_____ suffers.

Which of the following materials will accelerate the setting reaction of gypsum products?

Which form of dental gypsum product is created by boiling gypsum in a 30% solution of calcium chloride?

Using excessive water to prepare gypsum materials will result in:

Casts of teeth are used to make:

Which of the following statements is true of the compressive strengths of gypsum materials?

If a 2% solution of borax is added to the gypsum powder,what will be the result? The setting time will be:

Orthodontic plaster is a mixture of:

When a model or die is wet,its compressive and tensile strength is approximately _____ its strength when dry.

A hemihydrate will not set if the:

Which of the following types of gypsum products is also known as die stone?

Which of the following model and die materials are derived from the mineral gypsum?

When powder and water are added to the mixing bowl:

_____ are highly accurate replicas of a single tooth and generally are used to make metal crowns or inlays.

The _____ and _____ dense the crystal of the hemihydrate,the less excess water required to get a workable mass.

The impression should not be removed from the gypsum for _____ minutes.

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

Waxes

Casting Alloys, wrought Alloys, and Solders

Casting and Soldering

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Water-powder ratio is defined as the amount of water in _ added to the amount of powder in _.

The _ and _ dense the crystal of the hemihydrate,the less excess water required to get a workable mass.