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A Odonto > W3 - Types of casts, casting as a kind of information transfer > Flashcards

W3 - Types of casts, casting as a kind of information transfer Flashcards

1
Q

What is impression?

A

Negative imprint of the mouth

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2
Q

What is cast?

A

Positive likeness of a patient’s upper or lower jaw

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3
Q

What is die?

A

Small model of prepared teeth

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4
Q

As we know, casting is a kind of information transfer
-> describe the information flow (starting from patient)

A
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5
Q

How do we name impressions?

A
  1. It is not coming directly from the used impression material
  2. The name depending on the information needed to send to the dental lab
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6
Q

How many types of gypsum are there?

A

5 types

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7
Q

What is Type I Gypsum used for?

A

Impression plaster

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8
Q

What is type II gypsum used for?

A

Lab or model plaster

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9
Q

What is type III Gypsum used for?

A

Dental stone ordinary, model stone

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10
Q

What is type IV Gypsum used for?

A

Dental stone with high strength, low expansion

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11
Q

What is type V gypsum used for?

A

Dental stone with high strength, high expansion

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12
Q

What is this?

A

Study impression - study cast

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13
Q

Study impression should be mounted on ___

A

An articuator

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14
Q

2 pieces of info that we can obtain from study cast

A
  1. Relationship between hard and soft tissues
  2. Occlusal analysis (also from the lingual side)
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15
Q

Which type of gypsum is used to make study impression?

A

Type III

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16
Q

What is this?

A

Complete denture

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17
Q

Which types of impressions are used during the process of making complete denture?

A
  1. Primary impression
  2. Secondary impression
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18
Q

Which types of casts are used to make?

A
  1. Primary cast
  2. secondary cast
19
Q

Which type of gypsum used to make primary cast?

20
Q

3 pieces of information that secondary impression provides

A
  1. Gives more precise details about the hard and soft tissues
  2. Functional impression
  3. Vestibular sulcus
21
Q

What is the function of impression boxing? (secondary cast)

A
  1. Provides a protective rim around the cast
  2. use sticky wax
22
Q

Which type(s) of gypsum used to make secondary cast?

A

Type III/IV

23
Q

Secondary cast is made according to which type of impression?

A

Secondary impression

24
Q

What is this?

A

Fixed partial denture

25
Q

2 characteristics of impression for making fixed partial dentures

A
  1. Precisional situation impression
  2. Antagonist impression
26
Q

Which types of models are used for making fixed partial denture?

A
  1. Sectional model
  2. Antagonist model
27
Q

What are the 3 requirements for precisional situation impression?

A
  1. perfect copy of the prepared tooth (the dentist and technician need to follow the preparation line)
  2. Need to contain the other non-prepared surfaces
  3. No bubbles, no distortion
28
Q

What is sectional cast?

A

In sectional cast, the dies of the prepared teeth or roots that can be removed seperately from the cast to make a very accurate or precise wax pattern for making a fixed dental appliance

29
Q

Which type(s) of gypsum are used to make sectional model?

30
Q

Which piece of information does the base of die provide?

A

It provides a means of locating the die within a larger localizing model which includes the other teeth on the arch next to the prepared tooth

31
Q

3 types of materials to make preparing dies

A
  1. Die stone (most common)
  2. Acrylic
  3. Polyurethan
32
Q

List 3 methods that make preparing dies

A
  1. The Pindex method
  2. Crystal method
  3. Kiefer method
33
Q

Which type of gypsum is used for making antagonist cast?

34
Q

What is this?

A

Complex denture

35
Q

2 parts that complex denture include

A
  1. Fix part
  2. Removable part
36
Q

3 types of impressions for making complex denture

A
  1. Precisional situation impression
  2. Antagonist impression
  3. Situation “pick-up” impression
37
Q

4 types of casts for making complex denture

A
  1. Sectional cast
  2. Antagonist cast
  3. Master cast
  4. Working cast
38
Q

Which type(s) of impression(s) and cast(s) are used for fixed part of complex denture?

A
  1. Precisional situation impression
  2. Sectional cast
39
Q

Which type(s) of impression(s) and cast(s) are used for removable part of complex denture?

A
  1. Stuation impression; “pick-up” impression
  2. master cast
40
Q

What is master cast?

A

The cast that is first poured out with stone after taking impression at the dental office

!!! Ready appliances are also transported on it

41
Q

Name of this process

A

Duplicating (to make working cast)

42
Q

What is working cast?

A
  • A copy that is made from the master cast
43
Q

Function of working cast

A

Used for making the wax pattern for the metal framework of a removable partidal denture on its surface with prefabricated wax elements

A Odonto (11 decks)

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