IMPRESSION MATERIALS

Question 1

Yield Strength is

Answer 1

the stress at which a test specimen exhibits a specific amount of plastic strain

Question 2

Elastic strain

Answer 2

deformation that is recovered upon removal of an externally applied force or pressure

Question 3

Plastic strain

Answer 3

deformation that is not recoverable when the externally applied force is removed

Question 4

ALGINATE used At ASDOH

Answer 4

Jeltrate – Regular by Dentsply

AccuDent XD by Ivoclar vivadent

Question 5

Jeltrate Working and set time

Answer 5

Working time: 2’15

Set time: 3’30

Question 6

AccuDent XD work and set time

Answer 6

Working time: 2’ & 1’30’’

Set time: 2’45’’ & 3’45’’

Question 7

Regular alginate setting and work time time is…*****

Answer 7

2½ to 5 minutes set

2‘ working time

Question 8

Fast alginate setting and work time is…

Answer 8

1 to 2 minutes

30 to 45’‘ working time

Question 9

The relative amounts of water and powder influence

the flexibility of alginate by…

Answer 9

more water = more flexibility

Question 10

Alginate impressions are less likely to tear

during removal from the mouth when

Answer 10

they are removed rapidly

Question 11

Which alginate Water will evaporates if the impression is stored in air, and the impression will…

Answer 11

Shrink

Question 12

If the impression is placed in water, it absorbs

water and

Answer 12

Expand

Question 13

Also known as “rubber base” Highest tear strength Not dimensional stable, should be poured within one hour after setting

Answer 13

POLYSULFIDE IMPRESSION

Base
polysulfide polymers fillers plasticizers
Catalyst
lead dioxide (or copper) fillers
By-product
water

Question 14

Condensation PVS is supplied as two pastes at ASDOH, What are they?

Answer 14

• The base paste contains poly(dimethylsiloxane),
tetraethylorthosilicatefiller

• The accelerator paste contains metal organic ester

Question 15

Brand name of CONDENSATION PVS at ASDOH

Answer 15

Lab-Putty by Coltene

VPMix Putty by Henry Schein

Question 16

Bite Registrations Materials At ASDOH

Answer 16

Take 1 Advance by Kerr

Regisil Rigid by Dentsply Caulk

Question 17

Gypsum Classification

Answer 17

Type I mounting plaster
Type II model plaster
Type III dental stone
Type IV dental stone – high strength – low expansion Type V dental stone – high strength – high expansion

Question 18

Type III is used to fabricate

Answer 18

dentures

Question 19

Type IV/V are used to fabricate

Answer 19

crowns

Question 20

Type III Gypsums Used at ASDOH

Answer 20

Microstone

Question 21

Type IV Gypsums Used at ASDOH

Answer 21

Snap-Stone

Question 22

These have the highest coefficient of
thermal expansion of any dental
material.**

Answer 22

Waxes

Question 23

Impression Waxes – Bite Wax used at ASDOH

Answer 23

Disclosing Wax by Kerr

Occlusal Indicator Wax

Question 24

Impression Waxes – Bite Wax used at ASDOH

Answer 24

Aluwax by Aluwax

Beauty Wax by Moyco