Brainscape's Knowledge GenomeTM

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


See full index

BDS2 CDS DMS > intro > Flashcards

intro Flashcards

1
Q

what indicates a material is safe?

A

a CE mark

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

what are the 5 restorative materials available?

A 
amalgam
composite
glass ionomer cements
compomers
procelain
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what 4 impression materials are available?

A 
impression compound
impression paste
hydrocolloids
-alginate
elastomers
-polysulphides
-polyethers
-silicones
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the purpose of impression materials?

A

record position, shape and dimention of dentition

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

what metals/alloys are available?

A 
amalgam
cobalt chromium
titanium
gold
stainless steel
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

describe porcelain?

A

similar appearance to enamel so suits anteriors
ceramic veneers common
-material bounded to tooth aesthetically satisfying, hard, rigid, not always most appropriate

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

describe composite resin

A 
initially
flows out of cartridge
low to high viscosities 
finally
sets within margins
hardens
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

describe amalgam?

A

not aesthetic

good for substantial restorations

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

describe impression materials

A 
initially
flows into tray
low viscosity
finally
undergoes setting reaction
firm, stable
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is gypsum?

A

dental stone

allows studying and making appliances

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

what is ppma?

A

dentures acrylic resin
high quality
polymethylmethacrylate

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

when is stainless steel used?

A

denture base
strong enough to withstand biting forces
orthodontic appliance
can be adjusted easily for ideal fit

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

when is cobalt chromium used?

A

partial denture

able to withstand engagement and disengagement over long period

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

What consequences can happen when a force is applied to a material?

A 
Stretch/compress
-depends how force applied
Deform
-temporary/permanent
Fracture
-failure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the 3 types of force?

A

Compressive
Tensile
Shear
-parallel to surface object is attached

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

What is the formula for stress?

A

Force/unit area

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

What is the formula for strain?

A

Force/unit area

18
Q

What is the formula for rigidity? (elastic modulus)

A

Stress/strain

19
Q

What are the 8 possible mechanical properties?

A

Hard, soft, strong, weak, rigid, flexible, brittle, ductile

20
Q

What are the mechanical properties of enamel?

A

Brittle, hard, strong, rigid

21
Q

What force does biting apply to teeth?

A

Compressive

-to upper tooth

22
Q

What forces are experienced when grinding/chewing?

A

Tooth slides along surface of the other

Frictional forces

23
Q

What is the consequence of biting (compressive forces)

A

fracture

24
Q

What is the consequence of grinding/chewing?

A

abrasion

25
Q

Why do restorative materials have to be adhered to enamel?

A

If not they will be removed by masticatory force

26
Q

What restorative material required an undercut?

A

amalgam

27
Q

How does amalgam achieve retention?

A

undercut-mechanical

28
Q

How does composite resin achieve retention?

A

adhesive

29
Q

What are the requirements of a filling material?

A

Must be pliable, to fit shape of interest, must set to form hard, strong material

30
Q

What is the failure mechanism of fracture?

A

Large force causes catastrophic destruction of materials structure

31
Q

What is the failure mechanism of hardness?

A

Ability of surface to resist indentation

32
Q

What is the failure mechanism of abrasion?

A

Material surface removal due to grinding

  • tooth grinds/slides along opposing tooth surface
  • loss of material surface layers, roughened surface
33
Q

What is the failure mechanism of abrasion resistance?

A

Ability to withstand surface layers being removed, so compromising surface integrity

34
Q

What is the failure mechanism of fatigue?

A

Repetitive small stresses cause material fracture

35
Q

What is the failure mechanism of creep?

A

Gradual dimensional change due to repetitive small forces

36
Q

What is the failure mechanism of deformation?

A

Applied stress causes permanent change in materials dimensions

37
Q

What is the failure mechanism of de-bond?

A

Applied forces sufficient to break material-tooth bond

38
Q

What is the failure mechanism of impact?

A

Large, sudden force causes fracture

39
Q

Why is a rough surface bad?

A

can act as plaque trap

40
Q

where is de-bonding commonly used?

A

in removal of orthodontic appliance

-shear force used to separate bracket/bonding material from tooth surface

41
Q

what chemical properties should be considered?

A

setting mechanism
setting time
corrosive potential

42
Q

what physical properties should be considered?

A 
viscosity
thermal conductivity
thermal expansion
density
radiodensity

BDS2 CDS DMS (16 decks)

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