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D2 Fall - Fixed Prosth > 10/2: Impression Material and Technique > Flashcards

10/2: Impression Material and Technique Flashcards

1
Q
  1. What is a GPT-9 impression?
A

Digital impression
NOT a Negative likeness or copy in reverse of the surface of an object

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2
Q
  1. This is a method and manner used in making a negative likeness
A

a. Impression technique

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3
Q
  1. An impression should include tooth structure beyond
A

a. The finish line

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4
Q
  1. An impression should include tooth structure beyond the finish line to facilitate
A

a. Die ditching

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5
Q
  1. Should an impression extend to capture the vestibules, tuberosities, and retromolar pad?
A

Yes

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6
Q
  1. Do you want to have air bubbles?
A

No

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7
Q
  1. This is the ability of liquid to flow over a solid surface
A

Wettability

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7
Q
  1. Wettability related to the surface energy of the ______ and the surface tension of the ______
A

a. Solid
b. Liquid

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8
Q
  1. What is the contact angle of a hydrophobic?
A

a. >90

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9
Q
  1. What is the contact angle of a hydrophilic?
A

a. <90

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10
Q
  1. This is the resistance of liquid to flow, reverse of fluidity
A

a. Viscosity

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11
Q
  1. Viscosity relates to _____, liquid material
A

a. Unset

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12
Q
  1. This is when a fluid viscosity is NOT affected by shear rate, velocity is the same
A

a. Newtonian

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13
Q
  1. This is a fluid that does not follow newtonian, velocity can be changed
A

a. Non-newtonian

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14
Q
  1. This is shear thinning
A

a. Pseudoplasticity

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15
Q
  1. This is when you have reduced viscosity and viscous with increased shear
A

a. Pseudoplasticity

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16
Q
  1. This is characteristic of solid that behaves as an elastic solid and viscous liquid
A

a. Viscoelasticity

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17
Q
  1. The mechanical properties of viscoelasticity is dependent on
A

a. Loading rate

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18
Q
  1. As you increase the loading rate of viscoelasticity, what happens?
A

a. Properties improve

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19
Q
  1. This is the ability to replicate the inrta-oral surface details
A

a. Accuracy

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20
Q
  1. This is the ability to retain its absolute dimensional size over time
A

a. Dimensional stability

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21
Q
  1. This is the ability to resist tearing in thin sections, such as through feather edge material within
    the gingival sulcus
A

a. Tear resistance

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22
Q
  1. What are the 2 types of impression materials?
A

a. Elastic
b. Non-elastic

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23
Q
  1. What are the types of non-elastic materials?
A

a. Plaster
b. Impression compound
c. Zinc oxide eugenol
d. Impression wax

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24
Q
  1. What are the types of hydrocolloids?
A

a. Agar reversible
b. Alginate irreversible

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25
Q
  1. What are the types of non-aqueous elastomers?
A

a. Polysulfides
b. Polyethers
c. Condensation silicone
d. Additional silicone

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26
Q
  1. This are rigid and cannot be removed from undercuts
A

a. Nonelastic

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27
Q
  1. Edentulous impressions are
A

Nonelastic

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28
Q
  1. These can be removed from undercuts without distortion
A

Elastic

29
Q
  1. Dentate impressions are
A

Elastic

30
Q
  1. Is reversible agar commonly used today?
A

No

31
Q
  1. The soften under heat and solidify when cooled (temperature)
A

a. Reversible hydrocolloid

32
Q
  1. What kind of bonds do you see in reversible hydrocolloids?
A

a. Secondary bonds

33
Q
  1. This is a chemical reaction that cannot revert back to present state
A

a. Irreversible hydrocolloids

34
Q
  1. What kind of bonds do you see in irreversible hydrocolloids?
A

a. Primary bonds

35
Q
  1. Agar and alginate go from _____ to _____
A

a. Sol to gel

36
Q
  1. What are the gel properties?
A

a. Evaporation (shrinkage)
b. Syneresis: gel relaxation, water extruded from gel (shrinkage)
c. Imbibition: water absorbed causing expansion

37
Q
  1. Vinyl polysiloxane is known as
A

PVS

38
Q
  1. What is the byproduct of condensation?
A

a. H2O or OH

39
Q
  1. What is the byproduct of addition?
A

a. No byproduct

40
Q
  1. How far back should the tray extend?
A

a. 2-3mm beyond 3rd molars, retromolar, or tuberosities

41
Q
  1. How much material do you want between tray and occlusal/incisal edges?
A

a. 2-3mm

42
Q
  1. What are the types of trays?
A

a. Stock
b. Custom trays

43
Q
  1. This is used to prevent impression distortion due to material pulling away from the tray
A

a. Chemical Adhesion
b. Mechanical perforations or rims

44
Q
  1. Adhesive materials are
A

a. Specific for each material
b. Should always be used
c. Apply and dry

45
Q
  1. The goal of this is to get a fully or overextended impression of the arch
A

a. Preliminary impression

46
Q
  1. Good impressions are
A

a. Made not taken

47
Q
  1. Describe tooth retraction
A

a. 1 or 2 cords packed and removed right before taking final impression

48
Q
  1. After you take out the cord, what do you do?
A

a. Light body on sulcus
b. Medium and heavy impression on top

49
Q
  1. What are the techniques for gingival retraction?
A

a. Mechanical
b. Chemo-mechanical → cord
c. Surgery

50
Q
  1. How often is surgery used?
A

a. Very rarely

51
Q
  1. What are the types of cord?
A

a. Twisted
b. Knitted
c. Plain

52
Q
  1. How long should you leave the cord?
A

a. 4 minutes

53
Q
  1. Alginate is extracted from
A

a. Brown seaweed

54
Q
  1. What is the alginate equation?
A

a. Potassium or Sodium alginate + Calcium sulfate → insoluble calcium alginate

55
Q
  1. What is the accelerator for alginate?
A

a. Potassium titanium

56
Q
  1. What is the retarder for alginate?
A

a. Sodium phosphate

57
Q
  1. What are the fillers in alginate?
A

a. Zinc oxide
b. Diatomaceous earth

58
Q
  1. Thickness of alginate should be
A

3mm

59
Q
  1. What are the 2 major factors determining shelf life?
A

a. Storage temperature
b. Moisture

60
Q
  1. After pouring the impression, the stone cast should not be separated for
A

a. 60 minutes

61
Q
  1. You will get dimensional changes due to what?
A

a. Delay in pouring the impression

62
Q
  1. Non-aqueous elastic material is
A

a. Synthetic rubber

63
Q
  1. Non-aqueous materials offer what solutions?
A

a. Better dimensional stability
b. Better tear strength

64
Q
  1. Polysulfide is also known as
A

a. Metacarptan

65
Q
  1. Describe Polysulfide (how it comes, requirements, base, etc..)
A

a. 2 tubes, base and accelerator
b. Custom tray required
c. Base: polysulfide polymer
d. Catalyst: lead oxide

66
Q
  1. Describe PVS (how it comes, requirements, base, etc…)
A

a. Auto-mix unit
b. Special adhesive required
c. Base: poly dimethyl siloxane
d. Catalyst: poly vinyl siloxane
e. Cross-linking: alkyl ortho silicate
f. Filler: silica

67
Q
  1. What inhibits polymerization? (acts as a retarder)
A

a. Sulfur

68
Q
  1. Platinum acts as a scavenger for H2 in what reaction?
A

a. PVS/addition

69
Q
  1. What has the best dimensional stability?
A

PVS

70
Q
  1. Describe polyether (how it comes, requirements, base, etc…)
A

a. Hydrophilic
b. Automix, hand-mix, electronic mix
c. Base: polyether
d. Catalyst: glycol
e. Cross-link: sulfate
f. Filler: silica

71
Q
  1. What material has the highest tear strength?
A

a. Polysulfide

D2 Fall - Fixed Prosth (11 decks)

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