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Fixed Pros 2 2020 > Final review > Flashcards

Final review Flashcards

1
Q

A parallel post focuses its stress where?

A

-Apically

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2
Q

Where does a tapered post focus its stress?

A

-Coronally

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3
Q

Why would you put a cast post and core on a tooth?

A

-More than 1/2 of the coronal tooth structure is missing

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4
Q

Would you ever do a pre fabricated post if 3/4 of the coronal crown is missing in other words if 1/4 of the crown remains?

A

-No

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5
Q

What can you do with a prefabricated post to help give you retention?

A

-Ferrule (2 mm in the minimum height for an effective ferrule)

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6
Q

Does the surface texture of the intaglio surface have an effect on your retention?

A

Yes ( its needs to roughened and etched to improve)

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7
Q

Does a roughened tooth preparation have an effect on your retention?

A

-No

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8
Q

It is absolutely critical that the two members of the half member articulator to be parallel?

A

-No they can diverge, but you don’t want them to converge

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9
Q

What are the symptoms of a cracked tooth?

A
  • Pressure sensitive teeth
  • Cold sensitivity
  • Some inconsistentsy with symptoms
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10
Q

What is the ultimate treatment for a partially cracked tooth?

A

-Full coverage crown

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11
Q

What cusps do you more commonly find cracks in?

A

More common on non functional cusps than on functional cusps

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12
Q

What is an advantage of using gypsum bonded investments?

A

-It is a smoother finish, but you can’t heat them up as hot as phosphate investments

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13
Q

What keeps investments from burning up?

A

-Refractory materials usually quartz

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14
Q

Can you cool your investment molds and heat them up again before you cast them?

A

-No because the material will break down, it has to be done in one step

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15
Q

What does the addition of palladium do to the color of gold?

A

-Makes it white

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16
Q

What does that addition of copper do to gold?

A

-Makes it more yellow

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17
Q

With a broken arm casting machine why are the margins placed to the right or clockwise?

A

-The flow goes in a clockwise direction because the arm spins in a counter clockwise direction

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18
Q

When an existing crown comes off of a tooth where is the most common failure interface?

A

-The intaglio surface of the crown (most common failure point on a crown)

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19
Q

What are the three types of cements?

A
  • Esthetic
  • Self adhesive
  • Adhesive
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20
Q

What is a self adhesive resin cement that is at the UUSOD?

A

-Rely X unicem

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21
Q

Can you strengthen Rely X unicem by curing it with a light?

A

-Yes (the light enhances the polymerization linkage it also enhance the compressive strength)

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22
Q

What two properties of cements help improve retention and resistance of cements?

A
  • Increased Compressive strength

- Higher elastic modulus

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23
Q

Why do we use die spacer?

A

-Creates a space the luting or bonding agent, but we don’t use it on the margin so it can have a perfect seal

24
Q

What is a problem with placing a bridge on a mesially tipped #18 tooth greater than 30 degrees?

A
  • The tooth is off axis
  • The line of draw isn’t good so you could clip the mesial pulp horn when preparing the tooth.
  • Consider orthodontic uprighting of the tooth first
25
What do you do in the cause of a super erupted 1st Maxillary molar when you have lost a lower fist molar?
- Reduce it to restore line of occlusion | - Endodontically treat the tooth
26
What are the limitations of the double bite trays?
- Don't give you the contralateral canine guidance | - The tooth morphology on the contralateral side
27
When do you have to do full arch impressions in the clinic?
- 3 or more teeth - 2nd molar - Canines
28
What do double bite trays give you?
- They give you a very accurate bit - They give you proximal surfaces - They give you your prepared tooth - They give you proper occlusion
29
What are two metals in casting alloys that can be damaging to health?
- Nickel | - Beryllium
30
What do grooves, boxes, and isthumes need to be anchored in and when are they used?
- Dentin | - They are used to increase resistance and retention form especially in short crowns
31
GI chemistry is typically found in what in dentistry?
- Cements - Sealants - Buildups - Restorations - ****NOT in varnishes
32
What is the preferred way to anchor an endodontically treated tooth build up?
-Pulp chamber
33
How does zinc polycarboxylate bond to tooth structure?
-Calcium chelation (not necessarily a strong bond)
34
What is the first area you go to when fitting a crown?
-Proximal contacts
35
What is the first area you go to after you retreive you casting?
-Internal margins and intaglio surface
36
What are reductions of PFMs?
- 1.2 mm facial - .5 mm lingually - .5-1mm if metal in lingual concavity - 1-1.5 mm in porcelain in lingual concavity
37
What are some of the ways you would compensate for the morphological defficiencies for a tooth?
- Wax - Light cure restorative material - Carve out the putty
38
What is type I inlay wax?
- Has a higher melting point | - used for the direct method
39
What does the reservoir and sprue do?
-Keeps the metal molten longer there rather than on the crown so the suck back occurs on the button side
40
What does quenching do?
-Makes the metal more malleable because the grain structure is less ordered
41
Why do we use cotton rolls?
- Retraction - Keep things dry - Catch debri
42
What can shambolism lead to?
-Error
43
What can interefere with your ability to remove wax patterns from the die?
- No die lube - Undercuts - Flash/wax beyond the margins
44
Can you examine CR with a dual arch bite tray?
-No
45
Can you open the bite or do a diagnostic wax up with a dual arch bite tray?
-No
46
Full arch impressions mounted with a face bow will give you what?
-A reasonable reproduction of the patient
47
Why do we do full arch impressions/models?
-To see Centric relation and centric occlusion on patients
48
Why don't we use anything with GI in it as a cement for a post?
-It expands
49
Why do we grind off the end of the investment before putting it into the oven?
-Gas release
50
What is the difference between internal axial wall taper and external axial wall taper?
External axial wall tapers should converge | -Interal axial wall tapers should diverge
51
What does the occlusal offset do?
- Strengthen it | - Creates a staple effect
52
Can you directly finish gold on a tooth?
-Yes
53
What is the ideal distance between a wax pattern and casting ring?
- 3-6 mm - If less than 3 it will blow through the end - If more than 6 the gas can't escape
54
Where do retentive feature go?
-Dentin
55
Does the tensile strength have any effect on retention and resistance?
-No

Fixed Pros 2 2020 (9 decks)

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