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3rd Yr- CSB- Extra-coronal restorations > Crowns and Laboratory stages Introduction > Flashcards

Crowns and Laboratory stages Introduction Flashcards

1
Q

Name some examples of crowns and give their associated acronyms

A
  1. Full veneer crowns (FVC)
  2. Metal ceramic crowns. (MCC)
  3. Porcelain jacket crown (PJC)
  4. All ceramic crowns (ACC)
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2
Q

What is a crown?

A

Restoration that is constructed outside the mouth and is designed to encompass the entire tooth

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3
Q

What is a crown preparations (prep)?

A

The original tithe that has been prepared fora crown to sit on top of it

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4
Q

What is taper?

A

The degree of convergence of the walls

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5
Q

What is height in regards to extra-coronal restorations

A

Distance from margin to occlusal/ incised surface of prep

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6
Q

What is the preparation margin?

A

A line that demarcates where the extra coronal restoration meets the remaining natural tooth tissue

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7
Q

Define retention

A

Refers to elements of the preparation that are preventing the crown from lifting up in a vertical direction

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8
Q

Define resistance

A

Refers to elements of the preparation that are preventing the crown from tipping or rotating off during function

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9
Q

What do we use to cement the crown onto the tooth

A

Luting cement

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10
Q

What can you do if there’s not enough tooth tissue remaining to achieve sufficient retention and resistance?

A

Can place a composite core to get the right height and taper

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11
Q

What do you have to consider if you are thinking placing a crown?

A

The biological cost
AS you remover more enamel and define you expose dentinal tubules which can act as a highway for bacteria straight to the pulp causing plural necrosis

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12
Q

What does the abbreviation FVC stand for

A

Full veneer crown

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13
Q

Give some advantages of a gold FVC

A
  1. Strong
  2. Similar hardness toenail
  3. Inert so don’t corrode in the mouth
  4. Minimal tooth reduction needs
  5. Single manufacturing process
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14
Q

Give some disadvantages of a golf FVC

A
  1. Aesthetics (depending on patient)
  2. Very expensive
  3. Inert so won’t bond to the tooth
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15
Q

Give some indications for a FVC

A
  1. To restore a tooth back to function
  2. Posterior teeth where aesthetics aren’t concerned
  3. teeth with limited starting height (less occlusal reduction needed than any other type of crown)
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16
Q

List the different steps involve for placing an FVC

A
  1. Crown prep
  2. Impression of crown prep
  3. Lab makes a model
  4. Die preparation
    5, Start construction the crown using the lost wax technique
  5. Metal crown is finished and polished
  6. Places on the patient using luting cement
17
Q

What is the lost wax technique

A

It is where the crown is originally made from wax, the a mould is produced
This mould is heated causing the wax to get ‘lost’
The resulting space is filled with a molten alloy

18
Q

What does MCC stand for?

A

Metal ceramic crown

19
Q

give some advantages of placing a MCC

A
  1. Aesthetic
  2. Strong
  3. Durable
20
Q

give some disadvantages of placing a MCC

A

Porcelain layer needs to be thick to hide metal underneath- this means more tooth is removed during prep

21
Q

Give some indications for a MCC

A
  1. To restore a tooth back to function

2. used where aesthetics is a concern

22
Q

Briefly talk tough how a MCC is made

A
  1. Wax pattern of metal substructure produced and sprued
  2. Metal substructure trimmed to fit desire die
  3. Porcelain is built up and given extra detail
  4. Cemented
23
Q

What does PJC stand for?

A

Porcelain jacket crown

24
Q

What is a PJC?

A

It is essentially a thin veneer of porcelain that wraps around the entirety of the tooth

25
Q

When is a PJC usually placed?

A

If a patient has a pegged shaped incisor where theres low occlusal forces on the tooth and an aesthetic restoration is required

26
Q

What are the disadvantages of a PJC?

A

Ha no metal substructure and porcelain on its own is brittle

27
Q

What does ACC stand for?

A

All ceramic crown

28
Q

What are the advantages of an ACC

A
  1. Good strength

2. Good aesthetics

29
Q

How can ACCs be made?

A

Lost wax technique
OR
CAD/CAM in the surgery

30
Q

How is an ACC made chair side in the surgery?

A
  1. Prepared tooth and the arch is scanned
  2. Design crown on computer software
  3. It is then milled
  4. The miles crowns polished then stained and glazed

3rd Yr- CSB- Extra-coronal restorations (11 decks)

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