Condensation Silicones Flashcards
1
Q
Condensation Silicone viscosities
A
- Light body
- Medium body
- Heavy body
2
Q
Condensation Silicone composition
A
- Base
- Accelerator
3
Q
Base composition
A
-Polydimethylsiloxane
4
Q
Accelerator paste composition
A
- Ortho ethyl silicate(cross linker)
- Stannous Octoate(catalyst)
5
Q
Setting reaction of condensation silicones involves
A
-Dimethyl siloxane + Ortho ethyl silicate → Silicone + Ethyl alcohol
6
Q
Tray adhesive consituents
A
- Poly Dimethyl siloxane
- Ethyl silicate
7
Q
Setting time of condensation silicone
A
6-8 mins
8
Q
Mixing time of condensation silicones
A
45 secs
9
Q
Shrinkage percentage of condensation silicones
A
0.4-0.6%
10
Q
Cause of shrinkage of Condensation silicones
A
Ethyl alcohol(by product of reaction)
11
Q
Properties of Condensation silicones
A
- Pleasant odour
- Excellent accuracy
Stiff material(requires spacer-3mm)
- Hydrophobic(dry field required)
- Low shelf life(due to unstable ortho ethyl silicate)
