| A | B |
|---|
| Types of impression Materials | Alginate, Agar, Polysulfides, Polyethers, Condensation silicones, addition silicones, impression plaster, ZOE, Impression compound, Impression wax |
| Hydrocolliods | Agar and Alginate |
| Elastomers | Polysulfides, Polyethers, condensation and addition silicones |
| Inelastics | ZOE |
| Polyvinysiloxanes and polyethers | most popular in the dental office |
| Anatomic Pour | is pouring the anatomy part of the tray |
| When pouring the anatomic portion | place increments in the posterior and stay posterior |
| condensation silicone | gives off a by-product of water, alcohol, or gas |
| Polysulfides | are the oldest of the elastomers |
| Polysulfides impression materials | smell like rotten eggs |
| Elastormers | come in a base and catalyst |
| PVS | is also known as Polyvinyl Siloxane |
| Polysulfides | are hydrophobic |
| Some Polyvinyls | are hydrophilic |
| Polymerization is the | chemical reaction when the base and catalyst are mixed |
| PolyVinyls are | hydrophobic by nature |
| Viscosities of dental material | regular, heavy, light, medium |
| light viscosities | dispensed around the prepped tooth |
| heavy viscosities | are loaded into the impression tray |
| Polyether | is hydrophilic |
| Condensation | is hydrophobic |
| Polyether impression materials | are very stiff |
| Working time of elastomers | from start of mix until it can no longer flow |
| Setting time | measured from the start of the mix to the time the material is hard and can be removed from the mouth |
| Inelastic Elastormers can only be used on | edentulous patients (patients without teeth) |
| when dispensing a base and catalyst | dispense in two equal amounts |
| retraction cord | used to displace the gingival tissue away from the tooth preparation to create a space for the impression materials |
