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Dental Casting Flashcards

0
Q

Type of casting that supports tooth

Outside tooth

A

Onlay

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1
Q

Type of casting that is supported by the tooth

Fits inside tooth

A

Inlay

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2
Q

Three main uses of casting

A

Inlays and onlays
Partial dentures
Porcelain fused to metal crowns

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3
Q

Two types of wax pattern fabrication

A

Direct

Indirect

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4
Q

Wax pattern fabrication done inside the mouth

A

Direct

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5
Q

Type of wax patter fabrication wherein you (or the lab) may do the procedure based on an impression taken from the patient

A

Indirect

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6
Q

Channel used in dental casting wherein metal travels to form the restoration

A

Sprue

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7
Q

A part of the sprue that regulates the metal that goes to wax pattern (?)

A

Reservoir

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8
Q

Three common types of sprue material

What can a sprue be made up of?

A

Wax,
Plastic, or
Metal

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9
Q

Two main components of investment material

A

Binder

Refractory

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10
Q

A binder composes what percentage of an investment material?

A

30-35%

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11
Q

Refractory material composes what percentage of an investment material?

A

60-65%

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12
Q

What is an example of a binder that is most commonly used?

A

Gypsum

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13
Q

What are the two types of investment material (according to the binder used)?

A

Gypsum-bonded

Phosphate-bonded

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14
Q

What is a gypsum-bonded investment material commonly used for?

A

Inlays

Full cast crown (?)

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15
Q

What is the disadvantage of gypsum as a binder for investment material?

A

It can’t be used for bigger investments because high temperature can destroy gypsum

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16
Q

What is a phosphate-bonded investment material commonly used for?

A

Porcelain restorations

Partial dentures

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17
Q

What is the advantage of phosphate as a binder for investment material?

A

It can withstand high temperature

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18
Q

Summarize the procedures of dental casting.

19
Q

Imagine a set-up for dental casting. Identify the parts.

20
Q

Enumerate the steps in investing

21
Q

Enumerate the two mechanisms of investment expansion and the procedures applied.

A

Hygroscopic expansion
- add water after investment is mixed
Thermal expansion
- place casting ring inside oven

22
Q

Why do you need to expand the investment material?

A

To compensate for shrinkage. (Metal shrinks when casted

23
Q

What happens during a burnout?

24
What is the burnout temperature for hygroscopic expansion?
X
25
What is the burnout temperature for thermal expansion?
X
26
True or false: As much as possible, a sprue must be short and have a big diameter.
True.
27
Why should a sprue be angulated?
To avoid breakage of the wax pattern
28
What portion of the wax pattern should the sprue be attached on?
At the wax pattern's thickest portion
30
What are the factors affecting burnout time?
Size of ring Burnout temperature Number of rings Temperature during the start of burnout
31
The larger the ring, the _ the burnout time.
longer
32
The higher the burnout temperature, the _ the burnout time.
shorter
32
A process by which a stone-like material surrounds the wax pattern and sprue
Investment
33
The larger the number of rings, the _ the burnout time.
longer
34
What is the disadvantage of using a metal sprue?
It might not melt during burnout, thus metal may not go inside mold because metal covers the hole.
35
Give examples of refractory materials
Silica Quartz Cristobalite (?)
36
What is the use of refractory materials in the investment material? (Why is there a larger percentage of refractory than binder?)
To help gypsum (common type of binder) withstand high temperature
37
Give two examples of materials used for lining the casting ring during investment.
Ceramic paper | Asbestos (less expensive)
39
What is the function of detergent in the investing process?
As a surfactant | Since wax pattern is hydrophobic, hindi didikit if walang detergent
40
The higher the starting burnout temperature, the _ the burnout time.
shorter
41
Rotating machine used in dental casting
Centrifugal Casting Machine
42
Give an example of a flux
Borax
43
What is the use of a flux?
To remove the impurities of the metal
44
Another name for blowtorch
Acetylene torch (?)
45
Why do you place casting in an acid solution (i.e. nitric acid (?)) during pickling?
To remove surface oxides
46
Materials used for finishing
X

Dental Materials (3 decks)

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