Question 1

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. 
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. C

Question 2

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 denser 
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 denser B

Question 3

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)  crucible 
A)  die 
B)  sprue 
C)  casting 
D)  crucible B

Question 4

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. 
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.

Question 5

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) 
A)  Impression plaster (Type I) 
B)  Model plaster (Type II) 
C)  Dental stone (Type III) 
D)  Dental stone,high strength (Type IV)

Question 6

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

Question 7

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. 
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.

Question 8

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

Accepted Answer

•Type I: Impression plaster.Rarely used

Question 9

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

Accepted Answer

A)  0.15 
B)  0.45 
C)  1.00 
D)  2.50 
A)  0.15 
B)  0.45 
C)  1.00 
D)  2.50

Question 10

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 particles 
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 particles

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 treatment 
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 treatment

Question 12

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)  V 
A)  I 
B)  II 
C)  III 
D)  V

Question 13

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. 
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.

Question 14

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. 
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.

Question 15

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 treatment 
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 treatment

Question 16

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. 
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.

Question 17

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;decrease 
A)  lengthen;increase 
B)  lengthen;decrease 
C)  shorten;increase 
D)  shorten;decrease

Question 18

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 wax 
A)  Inlay wax 
B)  Sticky wax 
C)  Boxing wax 
D)  Bite registration wax

Question 19

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. 
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.

Question 20

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

Accepted Answer

A)  Saliva 
B)  Blood 
C)  Alginate 
D)  Set gypsum particles 
A)  Saliva 
B)  Blood 
C)  Alginate 
D)  Set gypsum particles

Which of the following is true of boxing wax?

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

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.

Which of the following statements is true of inlay waxes?

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

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.

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

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

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

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

Match the items with the correct description below. -Dies

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.

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

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

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

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

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

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

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

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

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Casting Metals, solders, and Wrought Metal Alloys

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Impression Materials

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

Exam 16: Gypsum and Wax Products

Which of the following is true of boxing wax?

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

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.

Which of the following statements is true of inlay waxes?

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

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.

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

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

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

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

Match the items with the correct description below. -Dies

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.

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

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

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

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

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

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

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

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

Introduction to Dental Materials

Oral Environment and Patient Considerations

Physical and Mechanical Properties of Dental Materials

General Handling and Safety of Dental Materials in the Dental Office

Principles of Bonding

Composites, glass Ionomers, and Compomers

Preventive and Desensitizing Materials

Teeth Whitening Materials and Procedures

Dental Ceramics

Dental Amalgam

Casting Metals, solders, and Wrought Metal Alloys

Dental Implants

Abrasion, finishing, and Polishing

Dental Cement

Impression Materials

Polymers for Prosthetic Dentistry

Provisional Restorations

Preventive and Corrective Oral Appliances

Filters

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

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