2. DENT 1210 Dental Materials II Lesson 5 Elastomeric Impression Materials

3. The 3 types of elastomerics 1. Polysulfide (Permlastic, CoeFlex) 2. Silicone condensation silicone- Polysiloxane (Examix, Cutersil) addition silicone- Polyvinylsiloxane (Extrude, Express) 3. Polyether (Impregum, Permadyne)

4. 2. 4 Viscosities Putty Heavy Body Regular Body Syringe or Injection

5. Viscosity

6. 3. Uses Used whenever accuracy is essential. Final impressions for removable and fixed prosthesis, including implants.

7. 4. Advantages& Disavantages Polysulfide- smelly, hard to mix, little tear Polysiloxane- ease of use, tear easily Polyvinylsiloxane- not use with latex gloves Polyether- does not need pour up soon, stiffer to remove from mouth

8. 6. Ingredients of Polysulfide Base- Mercaptan Accelerator or Catalyst- lead dioxide and sulfer Permlastic

9. Ingredients in polysiloxane Base- methylsiloxane and silica Catalyst- tin octoate

10. 6. Ingredients in Polyvinylsiloxane Base- polyvinylsiloxane Catalyst- platinum salt

11. Impression PVS

12. Ingredients in Polyether Base-polyether Catalyst- alky aromatic sulfonate

13. 7. Mix If 2 pastes- coat spatula with catalyst first Cartridges self mix in tips on gun (extruder) Putty- knead by hand

14. 8. Mix is set Mix complete when material is one color with no streaks and becomes stiff Material is set when elastic. (Polysulfide- about 7-10 minutes!)

15. 8. Impression Trays Custom- paint with adhesive Triple Kwik

16. VOCAB Dowel PinA dowel pin is used when pouring a model to make a Removable Die

17. The End