34. Dental Materials/ Prostho (CD) Flashcards Preview

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Flashcards in 34. Dental Materials/ Prostho (CD) Deck (199)
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1

Example of Inelastic Imp matl

Plaster of paris
(used as impression plaster before)

2

Example of ELASTIC Imp Matls

Colloidal soln
Zoe
Imp compound
Elastomers

3

Reversible hydrocolloids used in lab for duplication. From seaweeds.

Agar agar

4

BQ: Imp material that uses specialized equipment

Agar

5

Unique property of agar agar.
—ability of matl to change its form based on temperature
(Liquefaction/gelation)

Hysteresis

6

Property of agar agar to absorb water = expansion

Imbibition

7

Property of agar agar to release water = shrinks

Syneresis

8

BQ: Principal content of agar agar

Water

9

Hardener of agar agar

Borax

10

Least exp/cheapest imp matl
Fastest setting time
LEAST DIMENSIONALLY STABLE

Alginate or Irreversible hydrocolloids

11

BQ: Flexites is made of

Nylon

12

BQ: Major reactor of alginate

Sodium alginate or Potassium Alginate

13

Reactor of alginate

Calcium sulfate

14

BQ: Filler of Alginate

(Sa boards: SILICA!!!!)
* diatomaceous earth

15

Retarder of alginate

Sodium phosphate

16

BQ: Principal component of alginate

Diatomaceous earth

17

“Set alginate”

Calcium alginate

18

Ways to DECREASE SETTING TIME (faster set)

Inc water temp (hot/warm)
Mix rapidly (more friction=more heat)
Decrease water:powder ratio (thick)

19

BQ: what happens if you add a drop of liquid in ZOE

Decrease setting time (faster set)

20

BQ: Eugenol is derived from what oil?

Oil of cloves

21

Has obtundent effect on pulp; used for tx of dry socket

Eugenol

22

What are contraindicated with RESINS

Cavity varnish
Eugenol

23

BQ: How many coats of cavity varnish applied

1-2 coats

24

BQ: How long will the cavity varnish seal dentinal tubules

Short term

25

Imp compound or modelling compound/cake can be softened by:

Dry heat - torch—best
Water bath —most common

26

Examples of ELASTOMERS (PSP)

Polysulfide
Silicones
Polyether

27

Elastomers with longest setting time, foul odor, stains

Polysulfide

Stains and foul odor bec of lead peroxide

28

Least dimensionally stable AMONG ELASTOMERS

Condensation silicone

29

Least dimensionally stable Among ALL IMP MATLS

Alginate

30

Most dimensionally stable among elastomers

Addition silicones