Deck 10: Waxes

Question 1

Waxes:

A) melt at a single temperature.
B) do not have a discrete melting point at one temperature.
C) are mixtures of different components.
D) A and C.
E) B and C.

Answer 1

B and C.

Question 2

Resins used as patterns for dental restorations:

A) have higher strength than dental waxes.
B) have higher flow than dental waxes.
C) leave a residue when they burn out.
D) are available as chemically cured composite resins.

Answer 2

have higher strength than dental waxes.

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

Baseplate wax is available in:

A) round sticks.
B) sheets.
C) ready-made shapes.
D) strips.

Question 5

Which of the following is a plant wax that may be found as a component of inlay wax?

A) Paraffin
B) Ceresin
C) Carnauba
D) Beeswax

Question 6

Which of the following statements is true of 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 7

In general,_____ have the highest coefficient of thermal expansion of any dental material.

A) ceramics
B) silver amalgams
C) waxes
D) gold alloys

Question 8

Which of the following waxes are categorized as processing waxes?

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

Question 9

Which of the following types of wax is used to fabricate wax patterns for crowns,inlays,and bridges?

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

Question 10

Wax patterns should be carved with instruments at ____°

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

Question 11

Casting wax is used to:

A) fabricate wax patterns for crowns, inlays, and bridges.
B) form the wax pattern of the metallic framework of removable partial dentures.
C) build the contours of a denture.
D) register the details of soft tissue in a functional state.

Question 12

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 13

Component waxes in dental waxes are usually _____ molecules with _____ molecular weights.

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

Question 14

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

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

Question 15

In order to prevent residual stresses from forming:

A) wax should be carved at temperatures well below its melting range.
B) wax should be burnished 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 16

_____ waxes are used primarily in taking and pouring impressions.

A) Sticky
B) Boxing and utility
C) Corrective impression
D) Bite-registration

Question 17

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

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

Question 18

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) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 19

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 20

The time between finishing and investing a wax pattern should be:

A) at least a week so the wax can relax
B) more than 24 hours
C) between 5 and 30 minutes
D) less than 5 minutes

Question 21

Of the following,which is not an advantage of using resins versus waxes to manufacture crowns,bridges,and inlays?

A) Wax is stronger.
B) Wax is weaker.
C) Wax burns out cleanly.
D) Wax leaves residue.
E) Only A and C are advantages.
F) Only B and D are advantages.

Question 22

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

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

Question 23

The purpose of sticky wax is to:

A) correct an original impression.
B) gain accurate articulation.
C) temporarily hold metal together.
D) maintain a specific pattern.

Question 24

Pattern or casting waxes are used to fabricate:

A) inlays.
B) veneers.
C) crowns.
D) A, B, and
E) A and C only.

Question 25

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 26

The composition of inlay wax is complex depending on its use and may include which of the following wax components?

A) Carnauba
B) Ceresin
C) Paraffin
D) A, B, and C
E) A and C only

Question 27

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

A) Bite-registration
B) Sticky
C) Inlay
D) Corrective impression

Question 28

Sticky wax will break rather than become distorted if the assembled pieces move.The pieces of sticky wax can then be rejoined in their proper relationship.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second statement is false.
D) The first statement is false; the second statement is true.

Question 29

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

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

Question 30

Boxing,utility,and sticky waxes are all examples of _____ waxes.

A) processing
B) pattern
C) inlay
D) baseplate

Question 31

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

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

Question 32

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

A) casting
B) inlay
C) baseplate
D) all of the above
E) only A and B

Question 33

Sticky wax is:

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 34

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 35

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

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

Question 36

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

A) irreversible
B) reversible
C) no

Question 37

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.