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Fixed Pros 2020 > Definitive casts and dies > Flashcards

Definitive casts and dies Flashcards

1
Q

What are two other terms that synonymous with master cast?

A
  • Definitive cast

- Working cast

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2
Q

What is a replica or copy of the prepared tooth or teeth, ridge areas, and other parts of the dental arch known as?

A

-Master cast

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3
Q

What is a die?

A

-Positive reproduction of the prepared tooth

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4
Q

T/F The master cast must accurately represent both prepared and unprepared tooth surfaces

A

True

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5
Q

What must the unprepared teeth immediately adjacent to the prepared teeth be free of the meet the master cast requirements?

A
  • Voids
  • Defects
  • Irregularities
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6
Q

All contacting surfaces of opposing teeth in MI and any tooth surfaces involved in anterior guidance must be free of what to meet mast cast requirements?

A
  • Free of defects

- Allow for precise articulation

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7
Q

T/F All relevant soft tissues must be accurately reproduced, especially edentulous ridges that will be involved in fixed prostheses

A

True

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8
Q

For die requirements all _______ areas must be accessible.

A

Marginal

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9
Q

Epoxy resin is _____ abrasion resistant that gypsum.

A

More

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10
Q

Epoxy resin is ____ expensive than gypsum

A

More

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11
Q

What type of impression material must be used for an epoxy resin?

A
  • PVS

- Polyether

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12
Q

What type of impression material must be used for a polyurethane?

A
  • PVS

- Polyether

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13
Q

Polyurethane is ____ abrasion resistant than gypsum

A

-More

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14
Q

Electroplated is ______ distorted

A

Easily

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15
Q

What is electroplated incompatible with?

A
  • Polyether

- Polysulfide

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16
Q

With flexible silicone or polyether the restoration is ___ separated from die.

A

Easily

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17
Q

Gypsum is _______ abraided.

A

-Easily

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18
Q

Gypsum is also known as what?

A

-Calcium sulfate dihydrate (mined this way)

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19
Q

What is calcination?

A

-The turning of dihydrate gypsum into dental stone (anhydrite)

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20
Q

When is the Beta-hemihydrate produced?

A

-When gypsum is heated in an open ketlle type to produce Type I and Type II Dental plaster or stone

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21
Q

Type I and Type II dental stone are what type of hemihydrate?

A

-Beta

22
Q

Type II Dental stone is what type of hemihydrate?

A

-Alpha

23
Q

What is alpha-hemihydrate also referred to as?

A

-Hydrocal

24
Q

When is alpha-hemihydrate produced?

A

-When gypsum is dehydrated under pressure in the presence of water vapor

25
Q

How is Densite produced?

A

-Gypsum is boiled in 30% CaCl solutions

26
Q

Type IV, and V dental stone is what?

A

-Densite

27
Q

What do you use type I stone for?

A

-Impression plasters and Mounting stone

28
Q

What is Type II stone used for?

A

-Model plasters

29
Q

What is type III stone used for?

A

-Model stones

30
Q

What is Type IV stone used for?

A

-Die stones

31
Q

What is Type V stone used for?

A

-Die stones

32
Q

What properties does Type IV stone have?

A
  • High strength

- Low expansion

33
Q

What properties does Type V stone have?

A
  • High strength

- High expansion

34
Q

What has the lowest expansion?

A

-Type I mounting stone

35
Q

What is plaster of Paris?

A

-Type I dental stone

36
Q

What type of stone do you used for Diagnostic casts, -working casts for Removable complete dentures?

A

Type III

37
Q

What is the theoretical lowest required volume of water needed to hydrate 100g of hemihydrate?

A
  • 18.6 mL
38
Q

Which type of hemihydrate crystals are smaller, more prismatic and regular in shape?

A

-Alpha

39
Q

Which type of hemihydrate crystals are larger, more porous and irregular in shape?

A

-Beta

40
Q

Which type of hemihydrate required more water?

A

-Beta

41
Q

Which type of hemihydrate produces a harder and stronger set structure?

A

-Alpha

42
Q

What does adding more water to the mix do to the set time?

A

-Increase the set time

43
Q

What can decrease the set time of the materials?

A
  • 2% K2SO4
  • Slurry mix
  • Increase water temp
44
Q

If you spatulate more quickly what does it to do the set time?

A

-Decrease

45
Q

T/F The high strength dental stone contains the least amount of excess water

A

True

46
Q

How long after mixing and pouring is the gypsum usually at its maximum wet strength?

A

-1 - 2 hours

47
Q

What is wet strength?

A

-The strength measured when excess water remains in the hardened mass of stone

48
Q

What is dry strength?

A

-Stone is its strength with all of the excess water removed.

49
Q

The dry strength is approximately ______ that of the wet strength?

A

-Twice

50
Q

What is hardness?

A

-Surface measurement of the resistance of one material to be deformed by indenting or scratching by another material

51
Q

T/F Surface hardness always correlates with abrasion resistance.

A

False

-They dont always correlate

Fixed Pros 2020 (17 decks)

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