Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Dental Materials Ch. 47 > Ch 47 > Flashcards

Ch 47 Flashcards

1
Q

Speciality Practices?

A

orthodontics, pediatric, and prosthodontics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

biohazards

A

items bought into the lab the can harbor infective blood and saliva

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

infective blood and saliva are?

A

biohazards

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

MSDS

A

material safety data sheet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

study cast/models/diagnostic cast

A

3d reproductions of the teeth and soft tissue of patients max and many. arches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

a mineral mined from earth

A

gypsum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

dihydrate

A

gypsum in its unrefined state

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

gypsum in powdered state

A

hemihydrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does the dihydrate form of calcium sulfate mean?

A

It means that it consists of two parts water to every one part calcium sulfate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the hemihydrate form of calcium sulfate mean?

A

It means only one-half part water to one part calcium sulfate.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

materials used to make dental models

A

gypsum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

types of gypsum

A

model plaster
____________
highstrength stone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

types of gypsum

A

highstrength stone
dental stone
_________

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When you mix gypsum powder with water….

A

the hemihydrate crystals dissolve in water to form clusters known as the nuclei of crystallization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Nuclei of crystallization

A

hemihydrate crystals dissolved in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What occurs with more intermeshing of the gypsum crystals

A

The more meshing that occurs, the greater the strength, rigidity, and hardness of the final product

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

As the gypsum crystals grow during the setting process

A

they intermesh and become entangled with each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

all 3 forms of gypsum consist of….

A

hemihydrate crystals

19
Q

Which form of gypsum has the densest crystals?

A

High-strength stone

20
Q

Which form of gypsum requires the most water for mixing

A

Model plaster

21
Q

differences of gypsums

A

size, shape, porosity of hemihydrate crystals

22
Q

dental plaster aka

A

plaster of paris

23
Q

dental plaster

A

white in color

24
Q

what is used to pouring impressions to make diagnostic models

A

dental plaster

25
Q

the crystals in ___ are irregular in shape and porous

A

plaster

26
Q

Model plaster requires the greatest quantity of water for mixing

A

which produces the weakest of the three forms of study model

27
Q

yellow in color

A

stone

28
Q

stone is used for a ….

A

more durable diagnostic cast is required

29
Q

dental stone crystals are…..

A

uniform in shape and less porous

30
Q

stone is …..

A

strong and denser

31
Q

Although stone is uniform and less porous it is….

A

less uniform in shape and more porous than those found in high-strength stone.

32
Q

High strength stone aka

A

densite or improved dental stone

33
Q

High strength stone has…….

A

the strength, hardness, and dimensional accuracy that make it ideal for use by the dental laboratory technician

34
Q

crystals in high strength stone are…

A

smooth, dense, and require less water for mixing

35
Q

which gypsum is used mostly for dental lab techs?

A

high strength stone

36
Q

which gypsum is ideal for dental lab techs bc of its strength, hardness, and dimensional accuracy?

A

high strength stone

37
Q

die is used for….

A

making wax patterns for crowns, bridges, and indirect restorations

38
Q

plaster powder/water ratio

A

100 g) to 45 to 50 mL of water

39
Q

dental stone p/w ratio

A

100 g) to 30 to 32 mL of water

40
Q

high strength stone p/w ratio

A

(100 g) to 19 to 24 mL of water

41
Q

when too little water is used….

A

it will be difficult to mix and shorter working time

42
Q

too much water…

A

mix will be thing and runny and longer setting time. the model will be weaker

43
Q

add all powder to water at same time or…

A

the crystallization process will be disturbed and the model will be weak

Dental Materials Ch. 47 (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions