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Semester 2 Dental Materials > Chapters 8 & 27 Quiz 2 > Flashcards

Chapters 8 & 27 Quiz 2 Flashcards

1
Q

are impressions negative or positive reproductions?

A

negative

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2
Q

impressions can be used to create a _______ or _________ which is a positive reproduction

A

model or cast

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3
Q

used to carry the impression material into the mouth

A

impression trays

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4
Q

impression trays can be ________ or _________

A

sterilized or disposable

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5
Q

take an impression of a smaller area, but can impress the maxillary and mandibular arch simultaneously

A

triple trays

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6
Q

dispensed onto a tray or directly on teeth and patient bites down

A

bite registration

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7
Q

the type of impression material being used depends on the ______ of the impression being taken

A

purpose

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8
Q

prepared teeth typically have ________

A

undercuts

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9
Q

what is required to take impressions of prepared teeth?

A

more elastic material

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10
Q

impressions on edentulous areas do or do not require as much detail?

A

do not

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11
Q

what type of impression material is used on edentulous areas of the mouth?

A

inelastic material which is harder and more rigid

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12
Q

measure of a liquids ability to flow

A

viscosity

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13
Q

placed in the sulcus to pull the tissue away from a tooth during crown and bridge preparations

A

retraction cord

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14
Q

impression material mixed with water

A

aqueous

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15
Q

impression material mixed with something other than water

A

nonaqueous

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16
Q

what are the three types of impression materials?

A
  1. inelastic
  2. aqueous elastomeric
  3. nonaqueous elastomeric
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17
Q

these materials change from a viscous liquid state called sol, to a semisolid, rubbery state called gel

A

aqueous

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18
Q

what are the types of inelastic impression materials?

A

plaster, wax, and zinc oxide eugenol

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19
Q

irreversible hydrocolloid

A

alginate

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20
Q

set by chemical reaction to reach gelation

A

irreversible hydrocolloid

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21
Q

what are the types of aqueous elastomeric impression materials?

A

alginate and agar

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22
Q

reversible hydrocolloid

A

agar

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23
Q

reaches gelation by means of temperature changes

A

reversible hydrocolloid

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24
Q

melting and gelling at different temperatures is _______

A

hysteresis

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25
Q

are alginate or agar impressions more accurate

A

agar

26
Q

potassium alginate which dissolves in water forming a _______ which is also known as a gel

A

sol

27
Q

alginate powder contains what?

A

potassium alginate, silica, antimicrobial agents, and water

28
Q

the contraction of a gel accompanied by the separating out of liquid

A

syneresis

29
Q

the absorption of one substance by another

A

imbibition

30
Q

it is important to limit the time that an impression is exposed to an aqueous disinfection solution because of _______

A

imbibition

31
Q

models should be poured shortly after an impression is taken because of __________

A

syneresis

32
Q

what are the types of non aqueous elastomeric impression materials

A

polysulfides, condensation silicones, polyethers, and addition silicones

33
Q

how do polysulfides and condensation silicones set

A

via condensation polymerization

34
Q

what does condensation polymerization produce as a by-product

A

water

35
Q

what type of system is are polysulfides

A

paste-paste

36
Q

what are more accurate than alginate but not as accurate as other nonaqueous elastomeric materials

A

polysulfides

37
Q

what type of impression materials taste and smell bad

A

polysulfides

38
Q

what by-product is produced with condensation silicones

A

alcohol

39
Q

what type of impression material is cleaner but harder to use

A

condensation silicones

40
Q

do condensation silicones have to be poured fast or slow

A

fast

41
Q

how do polyethers set

A

via cationic polymerization

42
Q

what is there by-product of polyethers

A

none

43
Q

what type of impression material is clean, tastes bad, and expensive

A

polyethers

44
Q

what is the post popular non aqueous elastomeric material

A

addition silicones

45
Q

how do addition silicones set

A

via polymerization with no by-product

46
Q

increase wetting and reduce bubbles in the stone when the impression is poured up

A

surfactants

47
Q

what impression material has surfactants added to them?

A

addition silicones

48
Q

what three impression materials are inelastic

A

plaster, wax or impression compound, and ZOE

49
Q

each tray should extend ______ to include all teeth as well as the musculature and vestibule

A

facially

50
Q

how many mm of depth of alginate should be provided beyond the occlusal surface and incisal edges

A

2-3 mm

51
Q

what can be placed around the boarders of the tray to add length/depth

A

rope wax

52
Q

should removable appliances be taken out before taking impressions

A

yes

53
Q

what temp of water increases the setting rate

A

warmer

54
Q

what water temp slows the setting reaction

A

cooler

55
Q

speeds up reaction; warm water; also potassium sulfate

A

accelerator

56
Q

slows down reaction; cooler water; also borax

A

retarder

57
Q

where should a right handed operator stand when seating a mandibular tray

A

7 oclock

58
Q

where should the operator stand when seating a maxillary tray

A

11 oclock

59
Q

what percent humidity do impressions need to be kept in if not poured up immediately

A

100 %

60
Q
A

Semester 2 Dental Materials (8 decks)

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