Question 1

Increased porosity of the gypsum particles makes it necessary to use _____ water to convert the _____ when mixing gypsum products.

Accepted Answer

A)   more;hemihydrate particles back to dihydrate particles
B)   less;hemihydrate particles back to dihydrate particles
C)   more;dihydrate particles back to hemihydrate particles
D)   less;dihydrate particles back to hemihydrate particlesE) B) and D)
F) B) and C)

Question 2

When proportioning gypsum products,the water should be measured with a graduated cylinder and the powder should be:

Accepted Answer

A)   mixed by guess and by golly.
B)   weighed on a scale.
C)   measured with the use of scoops.
D)   measured with a graduated cylinder as well.E) All of the above
F) None of the above

Question 3

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

Accepted Answer

A)   Saliva
B)   Blood
C)   Alginate
D)   Set gypsum particlesE) All of the above
F) C) and D)

Question 4

Which of the following is true concerning the chemical properties of gypsum materials?

Accepted Answer

A)   Chemically,the mineral gypsum is a hemihydrate of calcium carbonate.
B)   To form the raw material into a powder,the manufacturer heats it and adds water.
C)   When the dihydrate is again mixed with water,a product with a viscosity capable of flowing is produced.
D)   The amount of water required to mix the calcium sulfate hemihydrate is greater than the amount required for the chemical reaction.E) None of the above
F) A) and C)

Question 5

The _____ the particles of gypsum powder are,the weaker and less resistant to abrasion is the final product.

Accepted Answer

A)   smaller,more irregular,and denser
B)   smaller,more regular,and more porous
C)   larger,more irregular,and more porous
D)   larger,more regular,and denserE) A) and D)
F) All of the above B

Question 6

Which of the following statements is true of inlay waxes?

Accepted Answer

A)   Most dentists prefer to use the direct waxing technique.
B)   These waxes are generally in light colors of white or yellow.
C)   Type I inlay wax is melted onto a die outside the mouth in a direct technique.
D)   They may be used directly in the mouth and placed onto the prepared tooth in the direct waxing technique.E) None of the above
F) C) and D)

Question 7

In the lost wax technique for casting gold for dental restorations,a _____ is attached to the pattern to form the channel into which the molten metal will be forced.

Accepted Answer

A)   die
B)   sprue
C)   casting
D)   crucibleE) A) and B)
F) A) and C) B

Question 8

Which of the following statements is true concerning the mixing of plaster and stone materials?

Accepted Answer

A)   The measured amount of powder is placed into the mixing bowl and the water is slowly sifted into the powder.
B)   The measured amount of powder is placed into the mixing bowl and the water is dumped into the powder.
C)   The measured amount of water is placed into the mixing bowl and the powder is slowly sifted into the water.
D)   The measured amount of water is placed into the mixing bowl and the powder is dumped into the water.E) None of the above
F) All of the above

Question 9

When working models for cast restorations are being made,a die of high-strength stone (Type IV) is often poured with a base and adjacent teeth of Type _____ stone.

Accepted Answer

A)   I
B)   II
C)   III
D)   VE) A) and B)
F) All of the above

Question 10

Utility wax may be used to:
1) adapt the periphery of an impression tray.
2) provide a better fit into the vestibule of the impression material.
3) cover sharp brackets and wires for orthodontic patients.

Accepted Answer

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

Question 11

Match the items with the correct description below.
-Dies

Accepted Answer

A)  Replicas of the prepared teeth that are generally removable from the working cast
B)  Hard replicas of hard and soft tissues of the patient's oral cavity made from gypsum products
C)  Casts generally made from dental plaster or stone and used for patient education,treatment planning,and tracking of the progress of treatmentD) A) and B)
E) A) and C)

Question 12

Which of the following is an example of a pattern wax?

Accepted Answer

A)   Inlay wax
B)   Sticky wax
C)   Boxing wax
D)   Bite registration waxE) A) and C)
F) A) and B)

Question 13

Match the items with the correct description below.
-Study models

Accepted Answer

A)  Replicas of the prepared teeth that are generally removable from the working cast
B)  Hard replicas of hard and soft tissues of the patient's oral cavity made from gypsum products
C)  Casts generally made from dental plaster or stone and used for patient education,treatment planning,and tracking of the progress of treatmentD) None of the above
E) B) and C)

Question 14

Model plaster has a water-to-powder ratio of approximately _____ (mL/g) .

Accepted Answer

A)   0.15
B)   0.45
C)   1.00
D)   2.50E) None of the above
F) A) and C)

Question 15

An increase in spatulation time and rate will _____ the setting time and _____ the rate of setting expansion.

Accepted Answer

A)   lengthen;increase
B)   lengthen;decrease
C)   shorten;increase
D)   shorten;decreaseE) A) and D)
F) C) and D)

Question 16

Which of the following is true of boxing wax?

Accepted Answer

A)   A strip of boxing wax is 3 inches wide.
B)   Boxing wax is difficult to manipulate at room temperature.
C)   Boxing wax is slightly tacky at room temperature.
D)   Boxing wax comes in ropes that are easily manipulated at room temperature.E) A) and C)
F) A) and D) C

Question 17

Which of the following statements is true regarding dimensional accuracy of gypsum products?

Accepted Answer

A)   Plaster has the least amount of setting expansion.
B)   Plaster has the least amount of setting contraction.
C)   High-strength stones have the least amount of setting expansion.
D)   High-strength stones have the least amount of setting contraction.E) All of the above
F) A) and B)

Question 18

List and describe the use of the different types of gypsum products used in dentistry.

Accepted Answer

•Type I: Impression plaster.Rarely used ...

Question 19

What could occur if excess residue remains in the investment mold after the wax pattern is melted out?

Accepted Answer

A)   This will create a harder and denser product.
B)   The melting temperature of the wax will increase.
C)   The melting temperature of the wax will decrease.
D)   This may result in inaccuracies in the object being produced.E) A) and C)
F) B) and C)

Question 20

Which of the following dental gypsum products will require the least water for mixing and will have the highest final density?

Accepted Answer

A)   Impression plaster (Type I) 
B)   Model plaster (Type II) 
C)   Dental stone (Type III) 
D)   Dental stone,high strength (Type IV) E) All of the above
F) B) and C)

Exam 16: Gypsum and Wax Products

Increased porosity of the gypsum particles makes it necessary to use _____ water to convert the _____ when mixing gypsum products.

Correct AnswerverifiedShow Answer

When proportioning gypsum products,the water should be measured with a graduated cylinder and the powder should be:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is true concerning the chemical properties of gypsum materials?

Correct AnswerverifiedShow Answer

The _____ the particles of gypsum powder are,the weaker and less resistant to abrasion is the final product.

Correct AnswerverifiedB

Which of the following statements is true of inlay waxes?

Correct AnswerverifiedShow Answer

In the lost wax technique for casting gold for dental restorations,a _____ is attached to the pattern to form the channel into which the molten metal will be forced.

Correct AnswerverifiedB

Which of the following statements is true concerning the mixing of plaster and stone materials?

Correct AnswerverifiedShow Answer

When working models for cast restorations are being made,a die of high-strength stone (Type IV) is often poured with a base and adjacent teeth of Type _____ stone.

Correct AnswerverifiedShow Answer

Utility wax may be used to: 1) adapt the periphery of an impression tray. 2) provide a better fit into the vestibule of the impression material. 3) cover sharp brackets and wires for orthodontic patients.

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Dies

Correct AnswerverifiedShow Answer

Which of the following is an example of a pattern wax?

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Study models

Correct AnswerverifiedShow Answer

Model plaster has a water-to-powder ratio of approximately _____ (mL/g) .

Correct AnswerverifiedShow Answer

An increase in spatulation time and rate will _____ the setting time and _____ the rate of setting expansion.

Correct AnswerverifiedShow Answer

Which of the following is true of boxing wax?

Correct AnswerverifiedC

Which of the following statements is true regarding dimensional accuracy of gypsum products?

Correct AnswerverifiedShow Answer

List and describe the use of the different types of gypsum products used in dentistry.

Correct Answerverified•Type I: Impression plaster.Rarely used ...View AnswerShow Answer

What could occur if excess residue remains in the investment mold after the wax pattern is melted out?

Correct AnswerverifiedShow Answer

Which of the following dental gypsum products will require the least water for mixing and will have the highest final density?

Correct AnswerverifiedShow Answer

Increased porosity of the gypsum particles makes it necessary to use _ water to convert the _ when mixing gypsum products.

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B

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B

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An increase in spatulation time and rate will _ the setting time and _ the rate of setting expansion.

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C

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•Type I: Impression plaster.Rarely used ...
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