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Dental Materials > Dental Casting > Flashcards

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.

A

X

19
Q

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

A

X

20
Q

Enumerate the steps in investing

A

X

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?

A

X

24
Q

What is the burnout temperature for hygroscopic expansion?

A

X

25
Q

What is the burnout temperature for thermal expansion?

A

X

26
Q

True or false: As much as possible, a sprue must be short and have a big diameter.

A

True.

27
Q

Why should a sprue be angulated?

A

To avoid breakage of the wax pattern

28
Q

What portion of the wax pattern should the sprue be attached on?

A

At the wax pattern’s thickest portion

30
Q

What are the factors affecting burnout time?

A

Size of ring
Burnout temperature
Number of rings
Temperature during the start of burnout

31
Q

The larger the ring, the _ the burnout time.

A

longer

32
Q

The higher the burnout temperature, the _ the burnout time.

A

shorter

32
Q

A process by which a stone-like material surrounds the wax pattern and sprue

A

Investment

33
Q

The larger the number of rings, the _ the burnout time.

A

longer

34
Q

What is the disadvantage of using a metal sprue?

A

It might not melt during burnout, thus metal may not go inside mold because metal covers the hole.

35
Q

Give examples of refractory materials

A

Silica
Quartz
Cristobalite (?)

36
Q

What is the use of refractory materials in the investment material?
(Why is there a larger percentage of refractory than binder?)

A

To help gypsum (common type of binder) withstand high temperature

37
Q

Give two examples of materials used for lining the casting ring during investment.

A

Ceramic paper

Asbestos (less expensive)

39
Q

What is the function of detergent in the investing process?

A

As a surfactant

Since wax pattern is hydrophobic, hindi didikit if walang detergent

40
Q

The higher the starting burnout temperature, the _ the burnout time.

A

shorter

41
Q

Rotating machine used in dental casting

A

Centrifugal Casting Machine

42
Q

Give an example of a flux

A

Borax

43
Q

What is the use of a flux?

A

To remove the impurities of the metal

44
Q

Another name for blowtorch

A

Acetylene torch (?)

45
Q

Why do you place casting in an acid solution (i.e. nitric acid (?)) during pickling?

A

To remove surface oxides

46
Q

Materials used for finishing

A

X

Dental Materials (3 decks)

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