Brainscape's Knowledge GenomeTM

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


See full index

Dental Materials > Dental Materials Pt. 3 (27-35) > Flashcards

Dental Materials Pt. 3 (27-35) Flashcards

1
Q

polysiloxanes are hydrophoboic/philic

A

hydrophobic (consequences for taking impressions)

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

polysiloxanes are cross linked by

A

hydrosilation reaction

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

how can surfactants affect polysiloxanes?

A

can make them hydrophilic

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

advantages of polysiloxanes

A

can repour!

dimensionally stable***

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

disadvantages of polysiloxane

A

overcoming hydrophobic properties

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

polyethers are hydrophilic/phobic

A

hydrophobic (but better surface characteristics

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

polyethers can control viscosity to control

A

thickness of impression

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

advantages of polyethers

A

good dimensional stability

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

disadvantages of polyethers

A

stiff, bad taste, low tear strength

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

unmixed ester can cause

A

contact dermatitis

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

gypsum is hydrophilic/phobic

A

hydrphobic

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

gypsum is cured how

A

water cured

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

advantages of gypsum

A

dimensionally stable, doesn’t stain, no odor or taste

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

disadvantages of gypsum

A

hard to vary set time, lots of bubbles, expensive

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

if you add silicone to gypsum it releases

A

hydrogen gas

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

calcination reaction

A

gypsum +water via heat= plaster

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

reverse gypsum reaction

A

add water it releases heat and goes back to calcium sulfate

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

properties of gypsum are dependent on

A

density and crystal structure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

is dental stone or plaster used for models?

A

dental stone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

denture base is normally

A

VLC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

provisionals are normally

A

chemically cured

22
Q

Mouthguards purpose

A

absorb impact

23
Q

mouthguards are thermoplastic or thermoset?

A

thermoplastic

24
Q

thermoplastic

A

can be melted and reformed

25
Q

thermoset

A

cant be melted and reformed

26
Q

function of cement

A

bind restorations to tooth

27
Q

requirements for cements

A

low viscosity
good mechanical properties
25 um thickness

28
Q

how are cement properties modified?

A

powder to liquid ratio

29
Q

More filler (powder) means more

A

viscosity

30
Q

restoration ratio of p/l

A

2.7:1

31
Q

low powder/liquid ratio increases

A

working and setting time

32
Q

resin cements are ____ based

A

water

33
Q

viscosity and strength of resin cements controlled by

A

powder to liquid ratio

34
Q

glass ionomers are ____ based

A

water

35
Q

glass ionomers adhere to

A

tooth structure

36
Q

glass ionomers release

A

fluoride

37
Q

disadvantages of glass ionomers

A

slow setting and looks bad

38
Q

purpose of bases and liners

A

protect pulp and minimize post op sensitivity

thermal/chemical barrier, controls inflammation, movement

39
Q

liners are a thin material used to protect

A

dentin from residual reactants

40
Q

liners have a ___ viscosity

A

low

41
Q

bases provide ____ for pulp

A

thermal protection

42
Q

bases provide mechanical support by distribution of

A

local stresses from restoration to underlying dentin

43
Q

calcium hydroxide is used for

A

pulp capping

44
Q

calcium hydroxide stimualates

A

odontoblast formation

45
Q

ZOE is used for

A

pain reduction

46
Q

ZOE can/cant be used with composite

A

cant, as it inhibits polymerization

47
Q

ZOE is a

A

sedative

48
Q

Wax requirements are

A

temporary, melt at low temps, carvable burn off, dimentionally stable

49
Q

lower molecular weight materials in between

A

polymers and organic liquids

50
Q

for mouthguards, copolymers control

A

properties

Dental Materials (3 decks)

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