Dental Materials Revision Q's

Question 1

Give two examples of muco-compressive impression material.

Answer 1

Compound.
Heavy body addition cured silicone.
Silicone putty, ZnO eugenol paste in close fitting tray.

Question 2

Give one example of a muco-static impression material.

Answer 2

Alginate
Plaster
Zno eugenol in a spaced tray.

Question 3

State two advantages of alginate as an impression material for partially dentate arches.

Answer 3

Records fine detail.
Elastic.
Inexpensive
Well tolerated

Question 4

State two disadvantages of alginate as an impression material for partially dentate arches

Answer 4

Low tear strength
Dimensional instability on storage.
Difficulty to disinfect.

Question 5

State one circumstance when alginate would be the material of choice for primary impressions for complete dentures.

Answer 5

Bony undercuts

Flabby ridge

Question 6

Give one example of a clinical impression procedure which compensates for differing tissues resilience.

Answer 6

Altered cast technique.

Window tray.

Question 7

When would you use the altered cast technique?

Answer 7

Free end saddle lower arch

Question 8

When fluoride ions leach out of GIC, what replaces them?

Answer 8

Hydroxyl ions