Deck 9: Dental Ceramics

Question 1

_____ is the amount or intensity of the color present.

A) Hue
B) Value
C) Chroma
D) Metamerism

Answer 1

Chroma

Question 2

Pressed ceramic veneers are _____ than feldspathic porcelain veneers and are too _____ for very dark teeth.

A) thinner;translucent
B) thinner;opaque
C) thicker;translucent
D) thicker;opaque

Answer 2

thicker;translucent

Question 3

Which of the following methods for fabrication of ceramic restorations utilizes the lost wax technique similar to that used to cast gold crowns?

A) Sintering
B) Slip-casting
C) Heat-pressing
D) Computer-assisted machining

Answer 3

Slip-casting

Question 4

Which of the following is true concerning matching the shade for ceramic restorations?

A) A composite guide may be used for a ceramic restoration.
B) The ideal color for the area in which the shade will be matched is blue.
C) Shade tabs should be moistened and individually held adjacent to the teeth to be matched.
D) Stare at the color of the shade tab and tooth for several seconds so that the retina can adjust.

Question 5

Which of the following is true of computer-aiding machining for crown and bridge techniques?

A) It is available only for fabrication of porcelain veneers.
B) No die needs to be poured,and no temporary crown is necessary.
C) A porous ceramic core is infiltrated with molten glass by capillary action.
D) Ceramic powder is mixed with a water-based liquid to form a mass that is pressed onto a porous refractory die.

Question 6

What is the major drawback of all-ceramic restorations in the posterior of the mouth?

A) Fracture rate
B) Lack of esthetic appearance
C) Difficulty in creating an acceptable interproximal contact area
D) Inability to create an adequate occlusal anatomy versus the opposing occlusion

Question 7

Porcelain veneers may be slightly translucent to let the color of the underlying tooth come through or more _____ to hide the color of a darker natural tooth.

A) opaque
B) mottled
C) varnished
D) sandblasted

Question 8

The metals used as the core for the porcelain-fused-to-metal (PFM)crowns are alloys of specific metals that will form a/an _____ layer as the metal is heated.

A) oxide
B) eutectic
C) scintillating
D) oxygen-inhibited

Question 9

Which of the following ceramic dental materials has a zirconium oxide or aluminum oxide matrix with fillers composed of modified atoms?
1)Most glass ceramic
2)Particle-filled glass ceramic
3)Polycrystalline ceramic

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

Question 10

Why do all-ceramic crowns have a more lifelike appearance than porcelain-bonded-to-metal crowns?

A) Have an opaque layer
B) Do not have an opaque layer to hide metal
C) Utilize high-fusing rather than low-fusing porcelain
D) Are cemented with different cements than porcelain-bonded-to-metal crowns

Question 11

The metal in the area of a PFM crown where the porcelain is to be bonded is approximately _____ mm thick.

A) 0.01 to 0.03
B) 0.1 to 0.3
C) 0.3 to 0.5
D) 1.0 to 2.0

Question 12

When a shade match is obtained,the shade tab should be _____ the tooth to be matched.

A) behind
B) in front of
C) in the same plane as
D) outside of the mouth,in contrast to

Question 13

In general,the shade of a tooth should be taken _____ preparation of the tooth and _____ a rubber dam is placed.

A) before;before
B) before;after
C) after;before
D) after;after

Question 14

The best arrangement for the coefficient of thermal expansion of the porcelain and the metal to be compatible is for the porcelain to have _____ thermal expansion than the metal.

A) slightly less
B) slightly more
C) significantly less
D) significantly more

Question 15

All-ceramic restorations can be used for which of the following indirect dental restoratives?
1)Inlays
2)Onlays
3)Crowns
4)Veneers

A) 1,2,3,4
B) 1,2,3
C) 1,2,4
D) 1,2

Question 16

Which of the following is true concerning lighting for shade taking?

A) A natural east light is considered a good light for shade taking.
B) Fluorescent lights emit more yellow light and incandescent lights emit more blue light.
C) Early morning and late afternoon light contains more yellow and orange light and less green and blue.
D) The bright light from the dental unit will tend to decrease the perceived brightness of the shade and increase the color intensity.

Question 17

An extra light bleached tooth will have _____ chroma and _____ value.

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

Question 18

Which of the following is the first layer of porcelain applied to the metal during fabrication of porcelain-metal restorations?

A) Body porcelain
B) Incisal porcelain
C) Opaque porcelain
D) Translucent porcelain

Question 19

What is the main advantage of the combination of porcelain and metal for fixed crown and bridge prosthodontics?

A) Direct fabrication of the restoration in the patient's mouth
B) Superior esthetics when contrasted with all-porcelain jacket crowns
C) The use of high-fusing porcelain for superior bonding to tooth structure
D) The strength and durability produced by the bond between a metal internal core and the porcelain covering

Question 20

Silane is a coupling agent that may be added to the _____ surface to enhance the bond and form a chemical union between the porcelain and the resin cement.

A) etched porcelain
B) unetched porcelain
C) etched resin cement
D) unetched resin cement

Question 21

Describe the different techniques for fabrication of ceramic restorations.

Question 22

Which of the following is a key advantage of low-fusing porcelains?

A) They have an opaque layer.
B) They are much stronger.
C) They appear opalescent.
D) They are less abrasive.

Question 23

Which of the following is most challenging when placing veneers?

A) The patient has a diastema.
B) The natural tooth structure is dark.
C) The teeth are rotated out of occlusion.
D) The adjacent teeth have been bleached.

Question 24

A CAD/CAM machined crown uses an optical scanner to do what?

A) Design the prep
B) Design the crown
C) Make the temporary
D) Take the impression

Question 25

Match the items with the correct description below.
An intense color

A)Long wavelength
B)Short wavelength
C)High value
D)Low value
E)High chroma

Question 26

What is the ideal color of the surrounding area during shade matching?

A) Tan
B) Gray
C) Black
D) White

Question 27

What is the primary cause of porcelain failure?

A) Occlusal loading
B) Firing defects
C) Oral habits
D) Poor diet

Question 28

Match the items with the correct description below.
Violet color

A)Long wavelength
B)Short wavelength
C)High value
D)Low value
E)High chroma

Question 29

Which of the following is not a characteristic used for taking shades?

A) Translucency
B) Chroma
C) Value
D) Hue

Question 30

When porcelain particles are melted and fused to metal,what is the process known as?

A) Firing
B) Smelting
C) Bonding
D) Sintering

Question 31

Match the items with the correct description below.
Red color

A)Long wavelength
B)Short wavelength
C)High value
D)Low value
E)High chroma

Question 32

Match the items with the correct description below.
A lighter color

A)Long wavelength
B)Short wavelength
C)High value
D)Low value
E)High chroma

Question 33

Match the items with the correct description below.
A darker color

A)Long wavelength
B)Short wavelength
C)High value
D)Low value
E)High chroma

Question 34

Which of the following would be taken into consideration when a tooth is shaded?

A) Translucency
B) Texture
C) Luster
D) All of the above

Question 35

What is the temperature range for a medium fusing porcelain?

A) 1600° F to 1950° F
B) 2000° F to 2300° F
C) 2360° F to 2500° F
D) 2550° F to 2700° F

Question 36

The inside of the veneer is conditioned using what solution?

A) Sulfuric acid
B) Phosphoric acid
C) Hydrochloric acid
D) Hydrofluoric acid