Brainscape's Knowledge GenomeTM

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


See full index

23 Fixed Prosth > 6/23 - Abrasives and Polishing, 383-387 > Flashcards

6/23 - Abrasives and Polishing, 383-387 Flashcards

1
Q

steps after wax-up, investing and casting:

A
  1. preliminary finishing
  2. try-in and adjustment
  3. precementation polishing
  4. cementation
  5. postcementation finishing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

studies show that the more you___, the less plaque accumulates

A

polish

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

when doing preliminary finishing, should you start with less abrasive instruments than continue to coarse abrasives?

A

NO! start with coarse abrasives then continue with increasingly less abrasive instruments

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

should you spend more time with coarse or fine abrasives

A

coarse abrasives

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

when finishing, should the surface have an even amount of roughness

A

YES

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

what is a disorganized surface layer of highly polished metal produced by a series of abrasives of decreasing coarseness

A

Bielby layer

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

the Bielby layer is anagolous to what layer

A

smear layer

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

what are exceptionally hard materials that can be chipped, glued to a shank or disc and used to gradually smooth a surface

A

abrasives

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

T/F: the abrasive must be softer than the surface on which it is being used

A

FALSE! abrasive must be harder than surface on which it is to be used

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

what are the units the determine that hardness of abrasives

A

Knoop hardness number

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

what is the softest on KHN scale? hardest?

A

softest: cementum
hardest: diamond

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

what is the hardest of all abrasives

A

diamonds

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

what abrasive do we typically use on enamel or porcelain

A

diamonds

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

what is the other name for green stones

A

silicon carbide

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

what is the basic material of carborundum

A

silicon carbide “green stone”

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

does silicon carbide exist as discs or points

A

BOTH! silicon carbide aka green stone

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

what is the other name for brown, coral, and white stones? which is most abrasive to least abrasive?

A

aluminum oxide

most abrasive: brown
coral
least abrasive: white stone

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

what are the abrasives found in sandpaper kit

A

emery, garnet, sand, cuttle

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

what are powders combined with wax to form a cake

A

tripoli and rouge

20
Q

what is tin-oxide

A

a fine powder

21
Q

what must you always have on when working with abrasives

A

eye protection

22
Q

what is bonded to a paper backing or mixed with a binder and pressed into various shapes (points, wheels, etc.)

A

abrasives

23
Q

separating disks are also called what

A

Joe Dandy discs

24
Q

what are stiff, brittle and coarse; used for cutting off sprues; and very abrasive yet can leave an even surface

A

separating disks/Joe Dandy

25
Q

what is the most abrasive thats not a diamon

A

separating disk/Joe Dandy

26
Q

should separating disk/Joe Dandy be used at slowspeed?

A

YES

27
Q

What are sandpaper disks (emery, garnet, sand, cuttle)

A

Moore’s disks (E.C. Moore)

28
Q

should you use soflex disc in fixed?

A

no - only used in operative to polish resin

29
Q

do you use high or slowspeed for Moore’s disc

A

slowspeed

30
Q

what are extremely coarse and used for bulk removal

A

heatless stones

31
Q

what abrasive is used for porcelain

A

silent stones

32
Q

pink stones are also called what

A

aluminum oxide

33
Q

white stones are also called what

A

fine-grain alumium oxide

34
Q

what are examples of rubber wheels and points

A

Shofu points (brownies, greenies and super greenies)

35
Q

what bur to use to place initials in metal ingot

A

2 round bur in high speed

36
Q

what do you roughen both ends of the metal ingot with in the beginning

A

heatless stone

37
Q

coarser abrasive = [more or less] pressure = [higher or lower] speed

A

more pressure
lower speed

38
Q

finer abrasive = [more or less] pressure = [higher or lower] speed

A

less pressure
higher speed

39
Q

order to use:

white stone, green stone, coral stone

A
  1. green stone
  2. coral stone
  3. white stone
40
Q

what should you use to remove scratches on metal ingot

A

rubber wheel - should end up with a mirror like image

41
Q

which is coarse, which one is fine: grey compound vs. green compound

A

grey: coarse (pressure w/ slow speed)
green: finer (less pressure w/ higher speed)

42
Q

can you use the same robinson wheel for both gray and green compound

A

NO! use one wheel each

43
Q

if you can’t make it right…

A

at least make it bright

44
Q

if you can’t make it fine…

A

then make it shine FML

45
Q

what are useful abrasives for gold

A

sand, tripoli, rouge

23 Fixed Prosth (21 decks)

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