Elastomers Impression Material Pt.4 Flashcards
What is the composition of base taste of polysulfide
Polysulphide pre-polymer
Plasticizer dibutyl phthalate
Inert filter titanium dioxide
Name the composition of catalyst paste in poly sulphide
- Lead dioxide
- sulphur
- Dibutyl phthalate
What are the properties of Poly sulphides
- Good tear resistance
- Visco elastic
- Depends upon type (Accuracy thermal contraction etc.)
What is the reaction type for poly sulphides
Condensation polymerization
What are the two groups of silicon impression materials
- Condensation cured
- addition cured
What are the properties of condensation cured silicone impression materials
- Tear resistance
- elastic properties
- influence of filler content
- dimensional changes
- Non-toxic
What is the composition of condensation cured silicons paste
- Poly dimethyl siloxone
- Inert filler Silica
What is the composition of the liquid portion of condensation cured silicone impression material
- Cross-linking agent - Tetra ethyl silicate
- Catalyst a tin compound - dibutyl tin dilaurate
What are the properties of addition cured silicones
- Accurate impression
- good dimensional stability
- adequate setting characteristics and tear resistance and near ideal elasticity
- Pleasant odour
- Long shelf life
- Excellent reproduction of surface details
What is the composition of base paste of poly ethers
- Imine Terminated ether Pre-polymer
- Inert filler silica
- Plasticizer phthalate

What is the composition of catalyst paste in polyether 
- Aromatic sulphonic acid
- Inert filler - silica
- plasticizer - phthalate
What type of polymerization Takes place in poly ethers
Addition polymerization
What are the properties of poly ether impressions
- Rigid
- Tear resistance
- Elastic properties
- Dimensional stability
