Deck 10: Waxes

Question 1

When is casting wax used?

A) Fabricate wax patterns for crowns, inlays, and bridges
B) Build the contours of a denture
C) Register the details of soft tissue in a functional state
D) Form the wax pattern of the metallic framework for removable partial dentures

Answer 1

Form the wax pattern of the metallic framework for removable partial dentures

Question 2

Which of the following waxes are categorized as processing waxes?

A) Beading wax
B) Sticky wax
C) Inlay wax
D) A, B, and C
E) A and B

Answer 2

A and B

Question 3

Which type of wax may be molded around an unpoured impression to help contain the stone when it is vibrated into the impression?

A) Inlay wax
B) Sticky wax
C) Boxing wax
D) Corrective impression wax

Answer 3

Boxing wax

Question 4

Which of the following type of wax is used to fabricate wax patterns for crowns and other indirect restorations?

A) Casting wax
B) Boxing wax
C) Utility wax
D) Inlay wax

Question 5

Which of the following is not a mineral wax?

A) Paraffin
B) Ceresin
C) Carnauba
D) Both A and B are correct.

Question 6

What does resin have that is different than inlay wax when it comes to fabrication of crowns and bridges?

A) Available as chemically cured composite resins
B) Higher strength than dental waxes
C) Higher flow than dental waxes
D) Residue when they burn out

Question 7

__________ waxes are used primarily in taking and pouring impressions.

A) Sticky
B) Utility
C) Boxing
D) Corrective impression
E) Both B and C are correct.

Question 8

Utility and periphery waxes are about _____ in diameter.

A) 0.1 mm
B) 0.5 mm
C) 0.1 cm
D) 0.5 cm

Question 9

Which material listed has the highest coefficient of thermal expansion?

A) Waxes
B) Ceramics
C) Gold alloys
D) Silver amalgams

Question 10

How should wax be manipulated in order to reduce the amount of stress on the material?

A) Wax should be burnished at temperatures well below its melting range.
B) Wax should be carved at temperatures well below its melting range.
C) Wax patterns should be carved with warm instruments.
D) Melted wax should be added in large increments.

Question 11

Which of the following waxes are categorized as pattern waxes?

A) Baseplate wax
B) Utility wax
C) Inlay wax
D) A, B, and C
E) A and C

Question 12

How is baseplate wax dispensed?

A) Ready-made shapes
B) Round sticks
C) Sheets
D) Strips

Question 13

Which of the following statements is true of pattern waxes and resins?

A) They must have a melting range lower than the environment in which the pattern is made.
B) Too high of a melting range may make development of residual stresses a problem.
C) They must possess high flow at their working temperature.
D) All pattern waxes and resins must burn out with a residue.

Question 14

Which type of wax is used to hold the position of denture teeth before the denture is processed in acrylic?

A) Sticky wax
B) Utility wax
C) Baseplate wax
D) Corrective impression wax

Question 15

What is the time frame for investing a wax pattern once it has been completed?

A) At least a week
B) 24 hours
C) Between 5 and 30 minutes
D) Less than 5 minutes

Question 16

Which of the following statements is correct about the property of flow for dental waxes?

A) Flow is highly dependent on temperature and time.
B) For pattern waxes, flow at room temperature is a highly desirable property.
C) For processing waxes, flow at room temperature is a highly desirable property.
D) A and B are true statements.
E) A and C are true statements.

Question 17

Dental waxes are usually ________ molecules that have _____ molecular weights.

A) inorganic; high
B) inorganic; low
C) organic; high
D) organic; low

Question 18

Which statement(s) is/are correct about waxes?

A) Melt at a single temperature
B) Are mixtures of different components
C) Do not have a discrete melting point at one temperature
D) A and B are correct.
E) B and C are correct.

Question 19

Wax carving instruments should be at what temperature when in use?

A) 7° C
B) 17° C
C) 27° C
D) 37° C
E) 47° C

Question 20

Organic molecules in waxes are composed primarily of long chains containing carbon, hydrogen, and oxygen. The long chains allow waxes to be flexible at room temperature or sticky as solids or liquids.

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 21

Organic molecules in some waxes contain long-chain elements. Which of the following is not part of that group?

A) Hydrogen
B) Carbon
C) Oxygen
D) Silica

Question 22

What is the purpose of sticky wax?

A) Temporarily hold metal together
B) Correct an original impression
C) Gain accurate articulation
D) Maintain a specific pattern

Question 23

Waxes have a specific melting point. Waxes are single-component materials.

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 24

The _______ the coefficient of thermal expansion for waxes, the _______ the expansion as the wax is heated.

A) higher; lower
B) higher; greater
C) lower; lower
D) lower; greater

Question 25

Which type of wax is used as a wax veneer over an original impression to register the detail of soft tissues in a functional state?

A) Utility wax
B) Boxing wax
C) Baseplate wax
D) Corrective impression

Question 26

What are pattern or casting waxes used to fabricate?

A) Inlays
B) Veneers
C) Crowns
D) A, B, and C
E) A and C are both correct.

Question 27

Sticky wax will break rather than become distorted if the assembled pieces move. The pieces of sticky wax cannot be rejoined in their proper relationship therefore they need to be replaced.

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 28

Residual stress is stress remaining in a wax as a result of manipulation during heating, cooling, bending, carving, or other manipulation. Manipulation of wax puts molecules of the wax into positions that they like and can change because of their solid state.

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 29

Which of the following waxes may be used for bite registration?

A) Baseplate wax
B) Bite-registration wax
C) 28-gauge casting wax
D) A, B, and C
E) A and C

Question 30

The release of stress at higher temperatures will cause _________ deformation.

A) no
B) reversible
C) irreversible
D) insignificant

Question 31

Compare and contrast processing waxes with pattern waxes. Give examples of each.

Question 32

The flow of corrective impression wax at mouth temperature is ____%.

A) 10
B) 25
C) 50
D) 75
E) 100

Question 33

Manufactured in ready-made shapes, _____ wax is used for partial denture frameworks.

A) inlay
B) casting
C) baseplate
D) corrective

Question 34

The flow of wax increases as the temperature decreases. The release of stress in a wax pattern leads to distortion.

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 35

At _____ temperatures, waxes hardly flow at all, but as the temperature approaches the melting _____ of the wax, the flow increases.

A) low; point
B) low; range
C) high; point
D) high; range

Question 36

Which type of wax would include boxing, utility, and sticky waxes?

A) Processing
B) Baseplate
C) Pattern
D) Inlay

Question 37

Which statement is true about sticky wax?

A) Soft and pliable at room temperature
B) Hard and brittle at room temperature
C) Used to assemble metallic or resin pieces temporarily in position
D) Both A and C
E) Both B and C

Question 38

Under which conditions would a type III baseplate be recommended?

A) Cold climate
B) Tropical climate
C) When contouring dentures
D) To maintain a specific pattern

Question 39

Which of the following is an advantage of casting wax?

A) Flows easily
B) Slight tackiness
C) No residual stress
D) Can be light cured

Question 40

The lost-wax technique uses ________ wax to produce crowns, inlays, and veneers.

A) inlay
B) casting
C) baseplate
D) only A and B

Question 41

List the five important properties of waxes, and explain why each is essential to the success of the final outcome.