Brainscape's Knowledge GenomeTM

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


See full index

Module 6 - Fixed Pros > Impression Techniques for Crowns and Bridges > Flashcards

Impression Techniques for Crowns and Bridges Flashcards

1
Q

Name a polyether impression material

A

Impregum

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

What adhesive is used for each impression material?

A
  • Alginate: alginate adhesive.
  • Silicones: universal adhesive.
  • Polyether: polyether adhesive.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

2 advantages and 1 disadvantage of polysulphide impression materials?

A
  • Long working time.
  • Good for big undercuts (hence removable pros).
  • Smelly.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the 2 types of HYDROPHILIC impression materials?

A
  • Alginate.
  • Agar (Van R).
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

2 advantages and 3 disadvantages of polyether impression material?

A

Advantages:
- Very accurate.
- Less hydrophobic (do not store wet).

Disadvantages:
- Bad taste.
- Very stiff on removal. Stick to undercuts, problem in perio patients!!.
- Messy (if manual mixing).

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

How do condensation silicones compare to addition silicones (3)?

A
  • Less accurate.
  • Cheaper
  • Must leave for 24 hours before pouring.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

2 advantages of addition silicones? What is a requirement (outside of dry prep).

A
  • Very stable (2 years).
  • very accurate.
  • Must be left for more than an hour before pouring.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

2 condensation cured silicones?

A
  • Xantopren.
  • Optosil.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

3 types of hydrophobic impression materials?

A
  • Silicones.
  • Polysulphides.
  • Polyethers.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which elastomeric impression materials are most rigid when set? What must be done?

A
  • Addition cured silicones.
  • Polyethers.

Thus BLOCK UNDERCUTS (buccal sulcus, large interdental spaces, recesses beneath bridge pontics).

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

What adhesive is used for alginate?

A

alginate adhesive

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

What can be used to mix polyether impression materials?

A

The PENTAMIX (although can also do manual mixing).

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

2 disadvantages and 1 advantage of Agar?

A
  • Requires special tray with cooling mechanism.
  • Requires great care (Cu plated dies).
  • Can be VERY ACCURATE.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What impression material has addition and condensation cured versions?

A

Silicones (hydrophobic)

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

What is an important consideration when using SILICONE materials for impressions?

A

Must have a DRY PREPARATION as they are HYDROPHOBIC.

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

What is agar?

A

Hydrophilic impression material.

17
Q

What adhesive is used for silicone impression materials?

A

universal adhesive

18
Q

What adhesive is used for polyethers?

A

polyether adhesive

19
Q

3 addition cured silicones?

A
  • Aquasil.
  • president
  • affinis
20
Q

What is alginate?

A

Hydrophilic impression material.

21
Q

Name a polysulphide impression material

A

Permlastic

22
Q

4 downsides of alginate?

A
  • Not good for fixed pros.
  • Must be poured within less than 24 hours.
  • Requires correct tray.
  • Easily distorted.
23
Q

What kind of tray do we need for fixed pros?

A

a RIGID impression tray.

24
Q

What can be done to take impressions of difficult arch shapes?

A

Make a custom/ SPECIAL TRAY.
- made from COLD CURE ACRYLIC.

25
Q

What is the gold standard impression tray for fixed pros?

A

Rim lock trays.

26
Q

2 disadvantages of rim lock trays?

A
  • Cannot cut out of the mouth if stuck.
  • Difficult to sterilize.
27
Q

What material should a special tray NOT be used with? Why?

A

Polyethers as they are too stiff.

28
Q

What are the 3 different types of stock trays?

A
  • Plastic solo trays.
  • Polycarbonate trays (green, blue, yellow).
  • Metal Rim lock trays.
29
Q

What are plastic solo trays? What are they good for?

A
  • Type of STOCK TRAY.
  • Good with ALGINATE.
30
Q

Are plastic solo trays or polycarbonate trays better?

A

Polycarbonate trays

31
Q

What must all trays have?

A

PERFORATIONS and ADHESIVE

32
Q

What is the penyamix used for?

A
  • Polyether.
  • Heavy body silicone

Module 6 - Fixed Pros (8 decks)

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