Alignate

Question 1

Aqueous

Answer 1

Irreversible hydrocolloid(alginate)
Reversible hydrocolloid(Agar)

Question 2

Non-Aqueous

Answer 2

Polysulfide- rubber base
Pollysiloxane- condensation silicone rubber
Poly vinyl siloxane- addition reaction silicone rubber

Question 3

Study model

Answer 3

Poured up with lab/model plaster

Used for orthodontic consultation appointment

Question 4

Working cast

Answer 4

Poured up with stone use to make acrylic trays, retainers

Question 5

Die

Answer 5

Poured up with stone exact reproduction of a tooth that is being prepare for a crown

Question 6

What are the types of impressions

Answer 6

Aqueous and non aqueous

Question 7

Mixing time

Answer 7

Time specified by the manufacture to mix a material

Question 8

Working time

Answer 8

Time following the mixing time that a material can be manipulated before the initial set up

Question 9

Setting time

Answer 9

Time from the beginning of the mix until no indentation can be made it to the material

Question 10

Syneresis

Answer 10

Loss of water

Question 11

Imbibtion

Answer 11

Uptake of water

Question 12

Negative reproduction

Answer 12

Impression

Question 13

Positive reproduction

Answer 13

Model, cast or die produced from the impression

Question 14

What’s happens if the material is too viscous?

Answer 14

Displaces the patients soft tissue

Question 15

Under mixing

Answer 15

Grainy mix, poor detail

Question 16

Over mixing

Answer 16

Material will set up

Question 17

What the mixing time for the Alginate

Answer 17

45-60 seconds (check the maids tire directions)

Question 18

How do we check the study model?

Answer 18

Take a wax bite

Question 19

What’s the water powder ratio for the impression

Answer 19

More water- increases setting time

Less water- decreases setting time

Question 20

What’s the best method for changing the setting time

Answer 20

Colder water increases, slower setting time

Warm water decreases, shorter setting time