impression materials Flashcards
1
Q
Aqueous(hydrocolloid) impressions
A
Agar(reversible)
Alginate(Irreversible)
2
Q
Elastomer impressions
A
Polysulphur
Silicones
Polyether
3
Q
Impression compound use
A
Primary impression for edentulous arches
4
Q
Use of impression plaster
A
Pouring primary impression
5
Q
Use of impression wax
A
Bite registration
6
Q
Use of Zinc oxide euginol paste
A
Secondary impression
7
Q
Agar is converted from sol to
A
gel and gel to sol
Reversible
8
Q
Alginate is converted from sol to
A
gel
Irreversible
9
Q
Alginate is more accurate than agar
A
False
10
Q
Types of silicones
A
Condensation (B+A) Addition silicones(multiple viscosities available)
11
Q
Most accurate impression material
A
Polyether
12
Q
Alginate mixing time
A
- Fast set= 45 secs
- Regular set = 75 secs
13
Q
Alginate working time
A
Fast set = 1.25-2 mins
Regular set = 3 mins
14
Q
Alginate setting time
A
Fast set = 2-3.5 mins
Regular set = 3.5-5 mins
15
Q
Condensation silicone by product
A
-Alcohol
