DENT 1210 Dental Materials II

Lesson 5 Elastomeric Impression Materials

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)

2. 4 Viscosities

• Putty

• Heavy Body

• Regular Body

• Syringe or Injection

Viscosity

3. Uses

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

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

6. Ingredients of Polysulfide

• Base- Mercaptan• Accelerator or

Catalyst- lead dioxide and sulfer

• Permlastic

Ingredients in polysiloxane

• Base- methylsiloxane and silica

• Catalyst- tin octoate

6. Ingredients in Polyvinylsiloxane

Base- polyvinylsiloxane Catalyst- platinum salt

Impression PVS

Ingredients in Polyether

• Base-polyether• Catalyst- alky

aromatic sulfonate

7. Mix

• If 2 pastes- coat spatula with catalyst first

• Cartridges self mix in tips on gun (extruder)

• Putty- knead by hand

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!)

8. Impression Trays

• Custom- paint with adhesive

• Triple• Kwik

VOCAB

• Dowel Pin • A dowel pin is used when pouring a model to make a Removable Die

The End