Quiz 3

Question 1

-Naturally occurring mineral
-Used to make replicas of hard and soft tissue

Answer 1

Gypsum products

Question 2

Planning treatment and observing final models

Answer 2

Diagnostic cast

Question 3

 Replica of singular tooth
 Crown or bridge

Answer 3

Die

Question 4

What qualities do all models have?

Answer 4

Accuracy
Hardness
Dimensional stability

Question 5

What contains the most excess of water?

Answer 5

Plaster

Question 6

What contains the most air bubbles?

Answer 6

Plaster

Question 7

What contains the least excess of water?

Answer 7

Die stone

Question 8

What do gypsum products produce?

Answer 8

Model plaster
Dental stone
Die stone

Question 9

 Dry process
 Porous, irregularly shaped
 Diagnostic cast

Answer 9

Model plaster

Question 10

 Formed under stream, heat, and pressure
 Less porous, more uniform shape
 Working cast

Answer 10

Dental stone

Question 11

 Boiled in 30% calcium chloride – BEFORE steam, heat, & pressure
 Product of densite
 High resistance to heat and stress
 Blue, pink, or green

Answer 11

Die stone

Question 12

What hemihydrate is model plaster?

Answer 12

Beta hemihydrate

Question 13

What hemihydrate is dental stone?

Answer 13

Alpha hemihydrate

Question 14

What hemihydrate is die stone?

Answer 14

Alpha hemihydrate

Question 15

What model type would expansion be most detrimental?

Answer 15

Die

Question 16

What is model plaster (type II) used to create?

Answer 16

Diagnostic cast

Question 17

What is dental stone (type III) used to create?

Answer 17

Denture/ortho models

Question 18

What is High-strength/low-expansion stone (type IV) used to create?

Answer 18

Die stone
Cast restorations

Question 19

What are the chemical accelerators?

Answer 19

Potassium sulfate
Set gypsum

Question 20

What factors accelerate set time?

Answer 20

-Chemical accelerators
-Increased water temp.
-Increased spatulation

Question 21

What factors retard set time?

Answer 21

-Chemical retards
-Decreased water temp.
-Decreased spatulation

Question 22

What is the chemical retard?

Answer 22

Borax

Question 23

What are the model parts?

Answer 23

-Anatomic portion
-Art portion/base

Question 24

What are the pouring methods?

Answer 24

Double-pour
Inverted-pour
Boxing

Question 25

What are the factors to model trimming?

Answer 25

Neat Symmetrical Occlusal plane parallel to base

Question 26

What are the properties of wax?

Answer 26

Melting range Flow Excess residue Thermal expansion

Question 27

What must the melting range be higher than?

Answer 27

Environment temperature

Question 28

What are the three classifications of wax?

Answer 28

Pattern wax processing wax Impression waxes

Question 29

What are the types of pattern wax?

Answer 29

Inlay wax Casting wax Baseplate wax

Question 30

* Direct patterns in mouth * Indirect patterns on dies

Answer 30

Inlay wax

Question 31

Constructing metal framework of dentures

Answer 31

Casting wax

Question 32

* Impression in cool & warm climates * Recreate contours on dentures * Hold position of teeth on wax Trian

Answer 32

Baseplate wax

Question 33

What are the types of processing waxes?

Answer 33

Boxing wax Utility wax Sticky wax

Question 34

* Used to help pour up base portion of model * 1 ½ inch red strip

Answer 34

Boxing wax

Question 35

Used to fill in areas

Answer 35

Utility wax

Question 36

* Used like glue * Used for fabrication & repairs

Answer 36

Sticky wax

Question 37

What are the types of impression waxes?

Answer 37

Corrective impression wax Bite registration wax

Question 38

Used to take impression on edentulous patient

Answer 38

Corrective impression wax

Question 39

* Helps to articulate two models together * Deforms easily

Answer 39

Bite registration wax

Question 40

What are the steps to the lost wax technique?

Answer 40

o 1. Pour the die o 2. Wax the die o 3. Sprue the die o 4. Attach sprue to sprue base o 5. Invest wax pattern o 6. Burn out wax o 7. Cast restoration o 8. Final steps

Question 41

hannel that metal can flow through to fill the area

Answer 41

Sprue

Question 42

What happens when we mix?

Answer 42

hemihydrate -> H2O -> Dihydrate

Question 43

What is the main difference between model plaster and stone?

Answer 43

Partical size and shape

Question 44

What is the positive reproduction of the hard and soft tissues on a study model called?

Answer 44

Anatomic portion

Question 45

What can be added to increase the wetting compatibility of a non-aqueous impression and gypsum material?

Answer 45

Surfactant

Question 46

What gypsum product has a W/P ratio of 30/100?

Answer 46

Dental stone

Question 47

What is the process of heating dihydrate of calcium sulfate to eventually form powered calcium sulfate hemihydrate?

Answer 47

Calcination

Question 48

What has higher abrasion resistance than model plaster?

Answer 48

Dental stone

Question 49

What has a higher setting expansion than dental stone?

Answer 49

Model plaster

Question 50

What wax type is used to form a base into which to pour a gypsum model?

Answer 50

Boxing wax