Elastomeric Impression Materials

Question 1

Why do we take an impression and create study models

Answer 1

1. To study the case
2. To diagnose the case
3. To plan the treatment
4. To educate patients on their dental needs

Question 2

What are we looking for in an impression material

Answer 2

1. Consistency
2. Flow properties
3. Optimum setting time
4. Dimensional stability
5. Ease of handling

Question 3

What is an elastomeric impression material

Answer 3

A material that is used when an extremely accurate impression is essential

Question 4

What is an elastomer

Answer 4

A natural of synthetic ribber which has the ability to undergo deformation under the influence of a force and regain its original shape once the force has been removed

Question 5

What are elastomer made up of

Answer 5

Large molecules or polymers that link together when mixed into a 3d network
When stretched the 3d network uncoils and snaps back to original shape when the force is removed

Question 6

List the ideal properties of setting material

Answer 6

1. Non toxic and non irritant
2. Acceptable to the patient in terms fo setting time, taste and consistency
3. Surface reproducibility
4. Dimensional stability
5. Ease of mixing
6. Compatible with model materials
7. Cheap and long shelf life

Question 7

Name the 2 categories elastic impression materials fall under

Answer 7

1. Aqueous hydrocolloids
2. Non aqueous elastomers

Question 8

Give example of aqueous hydrocolloids

Answer 8

Agar
Alginate

Question 9

Give examples of non aqueous elastomers

Answer 9

Silicone condensation
Silicone addition