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Flashcards in Quiz review Deck (25)
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1
Q

How is the most efficient way to adjust zirconia?

A

-Fine diamond (don’t use a course diamond) the coarsest you would use is a medium diamond

2
Q

How much tooth structure is missing if a build up is necessary?

A

-1/2 or more coronal tooth structure

3
Q

What is the most significant factor in long term success when it comes to teeth restored with build ups?

A

-The amount of coronal tooth structure remaining

4
Q

What is a strengthening material of ceramics?

A

-LEucite

5
Q

Who produces most of the zirconia powder?

A

-Toso corporation (quality control)

6
Q

What is transformation toughening?

A

-When a crack begins to form in zirconia and induces a crystalline phase change at the crack

7
Q

What is the phase of zirconia used for strength and toughness?

A

-Tetragonal

8
Q

The damage of zirconia with a crack changes the zirconia from the tetragonal phase to what phase?

A

-Monoclinic

9
Q

Why is it critical that the abrasive to adjust zirconia is harder than the zirconia itself?

A

-Because it won’t cause the phase transformation from heating it up

10
Q

Is acufilm thicker or thinner than madam butterfly?

A

-Thinner

11
Q

What is the advantage of madam butterfly?

A
  • Shows relative intensities

- You can mark the same spot on the madam butterfly multiple times

12
Q

When you are adjusting your proximal contacts what is the process?

A

-Start with a medium at first but don’t adjust it right to the perfect contact because then when you polish it won’t be perfect anymore

13
Q

What do they used to stabilize ceria zirconia

A

-Alumina nanocomposite (aluminum oxide)

14
Q

In the green state how is zirconia machined?

A

-Soft machined

15
Q

How is lithium disilicate fabricated?

A
  • Pressed

- Machined (hard machine)

16
Q

What do build ups accomplish?

A
  • They enhance the connection to the tooth structure
  • Minimize the amount of restorative material
  • Serve as a thermal insulator
  • Serve as a chemical barrier
17
Q

What is the other factor that determines the success of restorations?

A

-Occlusion is favorable (eliminate lateral load make the forces axially)

18
Q

Why don’t we just put pins in all the time?

A
  • Anatomy of the tooth

- Pins can cause iatrogenic failure

19
Q

What are the disadvantages of using composite as a core material?

A
  • There is higher moisture absorption
  • Has a higher coefficient of thermal expansion (when exposed to temperature changes in the mouth it will expand and contract more)
  • These can be neggated with a nice restoration over the core
20
Q

What causes amalgam to expand after it is set?

A

-zinc

21
Q

If you do a buildup in a most environment what material would you use?

A

-Zinc free amalgam

22
Q

Can you use a chamfer for a lithium disilicate restoration?

A

-No

23
Q

Is it easier to put a lip at the margin with a chamfer or a rounded shoulder?

A

-Rounded shoulder

24
Q

What cement should you use for a post?

A

-Rely X unicem

25
Q

What is the only ceramic that you can use a chamfer margin for?

A

-Zirconia