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Fixed Pros 2020 > Final Review > Flashcards

Final Review Flashcards

1
Q

T/F Delayed cementation of fiber post resulted in higher retentive strengths in comparison to immediate cementation.

A

True

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2
Q

If a large gap exists what material should you use to cement the post?

A

-Core build up material

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3
Q

What are the most effective conditions for long term success of post endodontic restorations?

A
  • Preservation of tooth tissue
  • Ferrule
  • Adhesion
  • Good occlusion
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4
Q

What is a risk for fatigue fracture of teeth, cement, and restorative material?

A

-Nonaxial forces

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5
Q

What are the three conditions of tooth preparation?

A
  • Mechanical
  • Biological
  • Esthetic
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6
Q

What are some of the limitations of alginate?

A
  • Lacks fine detail

- Imbibition

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7
Q

How long is the recovery period for alginate?

A

10-15 minutes

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8
Q

What are the three resin cements?

A
  • Adhesive
  • Self adhesive
  • Esthetic
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9
Q

What is the resin cement with the strongest bond?

A

-Adhesive

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10
Q

T/F Esthetic has to be used with a bonding agent

A

-True

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11
Q

What is an example of a self adhesive resin cement?

A

-Rely X unicem

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12
Q

What is Rely X luting plus?

A

-RMGI

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13
Q

When don’t you want to use Rely X luting plus?

A
  • Posts

- Inlays

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14
Q

What are some of the properties of a Bis-GMA material?

A
  • Tough
  • Brittle (cautious for long span bridges)
  • Contains an oxygen inhibited layer
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15
Q

What is a main temporary material we use today?

A

-Bis-Acryl

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16
Q

What is a temporary material that is a methyl-methacrylate that has to light cure?

A

-Unifast

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17
Q

What type of matrix do you use with unifast?

A

-Alginate (don’t use the putty matrix)

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18
Q

What is the most esthetic version of zirconia?

A

-High translucent

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19
Q

What does the high trans zirconia have in it?

A

-Cubic phase

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20
Q

What is the strongest phase of zirconia?

A

-Tetragonal

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21
Q

What stabilizes the tetragonal phase of zirconia?

A
  • Yittria
  • Ceria
  • Alumina
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22
Q

What is the ideal length of the post?

A

2/3 to 3/4 of the root leaving 4-5 mm a gutta percha

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23
Q

If a tapered post where are the stresses transferred?

24
Q

If a parallel post where are the stresses transferred?

25
Does a longer or shorter post distribute the forces better?
-Longer
26
Is it ok to use a green stone to adjust zirconia?
-No because is causes a phase transformation
27
If a crack occurs in zirconia what is that known as?
-Transformation toughening
28
What are ways that zirconia can break down? (can cause tetragonal to monoclinic phase change)
- Fracture - Increased abrasivity - Low temperature aging degradation - Increased hydrothermal solubility
29
Is it ok when preparing a build up to expose a pin?
-Yes
30
When is it unacceptable to expose a pin?
-When you almost cut the pin off
31
What is the first parameter you check when fitting a crown?
-Proximal contacts
32
When you are looking for value what vision are you relying on?
-Scotopic (rods)
33
If you error do you want to err on high or low value?
-High because its easier to darken it up
34
Where is the best place to get the dominant Hue?
-Cervical third of an unrestored upper canine
35
With a high speed hand piece what is important when cutting on teeth?
- Keep teeth wet - Keep the waterports flowing (patent) - Don't cut on teeth if you can't use copious amounts of water
36
Is it ok to cut dry on a tooth?
-Yes, on a non-vital tooth, or on a vital tooth if the rpms are very low and you keep the tooth moistened intermittently (little points of touch up)
37
What is the liquid component of IRM?
-Eugenol (oil of cloves)
38
Can you put Eugenol on a tooth with an exposure?
-Yes
39
What do you do if you have a pinpoint pulpal exposure?
- Keep the tooth moist - Don't let it get contaminated - Do a direct pulp cap
40
Do you do direct pulp caps under indirect restorations?
-No
41
What is polyacrylic acid used in?
- The liquid component of zinc poly carboxylate (tyloc) - Also used in a glass ionomer cement - Used as a conditioner liquid for GI cements
42
What doesn't polyacrylic acid cause post operative sensitivity?
-It is to large to get into the dentinal tubules
43
What is the difference between dimension accuracy and dimensional stability?
- (accuracy) material being accurate as it sets and during removal from the mouth - (Stability) How long it stays that way and doesn't distort
44
What is elastic recovery?
-Impression material ability to rebound to proper dimensions after being removed from the mouth
45
What are the properties of an addition silicone (PVS)?
-Gives have H2 gas scavaged by palladium
46
What is the by product of condensation silicones?
-Ethyl alcohol
47
What is the most hydrophillic of all elastomers?
-Polyether
48
What are the downsides of polyether?
- Terrible taste | - Stiffest of elastomers
49
Does a thin or thick biotype have more susceptibility to recession of the gingiva?
-Thin
50
Hydrocal is used to make what?
-Type III
51
-Densite is used to make what?
- Type IV | - Type V
52
How does glass ionomer adhere to tooth structure?
-Ionic bond between the calcium in the tooth and the carboxylate in the cement
53
How does zinc polycarboxylate adhere to tooth structure?
-Calcium chelation
54
What is the purpose of a base?
- Get back to ideal prepared tooth structure | - Serve as an insulator
55
Will a liner serve as an insulator?
-No but it does as a chemical carrier
56
What is the purpose of a build up?
-increase connection of the tooth to the restoration
57
What allows you not to use a post?
-Chamber retained build up

Fixed Pros 2020 (17 decks)

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