Elastomeric Impression Materials

Question 1

What are the two types of elastomers to exist?

Answer 1

• polyether materials
• addition silicone materials

Question 2

How are elastomer materials formed?

Answer 2

by polymerisation with cross-linking of polymer chains

Question 3

What is the ideal viscosity of an impression material?

Answer 3

must be able to flow readily to enter undercuts etc

Question 4

What is the ideal surface wetting of an impression material?

Answer 4

must make intimate contact with teeth/mucosa

Question 5

What is the ideal contact angle of an impression material?

Answer 5

small contact angle so that there are no spaces between globules of impression material

Question 6

how can permanent strain of an impression material be lowered during use on a patient?

Answer 6

reduced load time = IMPRESSION REMOVED WITH A SHARP PULL

Question 7

What is the ideal rigidity of an impression material?

Answer 7

ideally low (flexible)

Question 8

What type of elastomer is Impregym Penta Soft (medium)?

Answer 8

polyether

Question 9

What type of elastomer is Aquasil Ultra?

Answer 9

addition silicone