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

Question 1

What is impression?

Answer 1

Negative imprint of the mouth

Question 2

What is cast?

Answer 2

Positive likeness of a patient’s upper or lower jaw

Question 3

What is die?

Answer 3

Small model of prepared teeth

Question 4

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

Answer 4

Question 5

How do we name impressions?

Answer 5

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

Question 6

How many types of gypsum are there?

Answer 6

5 types

Question 7

What is Type I Gypsum used for?

Answer 7

Impression plaster

Question 8

What is type II gypsum used for?

Answer 8

Lab or model plaster

Question 9

What is type III Gypsum used for?

Answer 9

Dental stone ordinary, model stone

Question 10

What is type IV Gypsum used for?

Answer 10

Dental stone with high strength, low expansion

Question 11

What is type V gypsum used for?

Answer 11

Dental stone with high strength, high expansion

Question 12

What is this?

Answer 12

Study impression - study cast

Question 13

Study impression should be mounted on ___

Answer 13

An articuator

Question 14

2 pieces of info that we can obtain from study cast

Answer 14

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

Question 15

Which type of gypsum is used to make study impression?

Answer 15

Type III

Question 16

What is this?

Answer 16

Complete denture

Question 17

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

Answer 17

1. Primary impression
2. Secondary impression

Question 18

Which types of casts are used to make?

Answer 18

1. Primary cast
2. secondary cast

Question 19

Which type of gypsum used to make primary cast?

Answer 19

Type III

Question 20

3 pieces of information that secondary impression provides

Answer 20

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

Question 21

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

Answer 21

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

Question 22

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

Answer 22

Type III/IV

Question 23

Secondary cast is made according to which type of impression?

Answer 23

Secondary impression

Question 24

What is this?

Answer 24

Fixed partial denture

Question 25

2 characteristics of impression for making fixed partial dentures

Answer 25

1. Precisional situation impression 2. Antagonist impression

Question 26

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

Answer 26

1. Sectional model 2. Antagonist model

Question 27

What are the 3 requirements for precisional situation impression?

Answer 27

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

Question 28

What is sectional cast?

Answer 28

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

Question 29

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

Answer 29

Type IV/V

Question 30

Which piece of information does the base of die provide?

Answer 30

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

Question 31

3 types of materials to make preparing dies

Answer 31

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

Question 32

List 3 methods that make preparing dies

Answer 32

1. The Pindex method 2. Crystal method 3. Kiefer method

Question 33

Which type of gypsum is used for making antagonist cast?

Answer 33

Type III

Question 34

What is this?

Answer 34

Complex denture

Question 35

2 parts that complex denture include

Answer 35

1. Fix part 2. Removable part

Question 36

3 types of impressions for making complex denture

Answer 36

1. Precisional situation impression 2. Antagonist impression 3. Situation "pick-up" impression

Question 37

4 types of casts for making complex denture

Answer 37

1. Sectional cast 2. Antagonist cast 3. Master cast 4. Working cast

Question 38

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

Answer 38

1. Precisional situation impression 2. Sectional cast

Question 39

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

Answer 39

1. Stuation impression; "pick-up" impression 2. master cast

Question 40

What is master cast?

Answer 40

The cast that is first poured out with stone after taking impression at the dental office !!! Ready appliances are also transported on it

Question 41

Name of this process

Answer 41

Duplicating (to make working cast)

Question 42

What is working cast?

Answer 42

- A copy that is made from the master cast

Question 43

Function of working cast

Answer 43

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