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Basic Fixed > 06 Impression Materials > Flashcards

06 Impression Materials Flashcards

1
Q

What are advantages of the elastomeric Polysulfide (rubber base)?

A
  1. Excellent tear strength
  2. Excellent detail reproduction
  3. Flows well into sulcus
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2
Q

What are disadvantages of the elastomeric Polysulfide (rubber base)?

A
  1. Long working and setting time
  2. Messy, difficult to mix
  3. Unpleasant taste/odor
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3
Q

What are advantages of the elastomeric Polyether?

A
  1. Very accurate
  2. Rigid
  3. Sets quickly
  4. Can be poured multiple times
  5. Does not need to be immediately poured
  6. Hydrophilic
  7. Good wetabilty by gypsum
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4
Q

What are disadvantages of the elastomeric Polyether?

A
  1. Rigid
  2. Low tear strength
  3. Absorbs moisture
  4. Expensive
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5
Q

What are advantages of the elastomeric Polyvinyl Siloxane?

A
  1. Very accurate
  2. Low permanent deformation
  3. Can be poured multiple times
  4. Does not need to be immediately poured
  5. Hydrophilic
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6
Q

What are disadvantages of the elastomeric Polyvinyl Siloxane?

A
  1. Expensive
  2. Releases hydrogen gas
  3. Powdered gloves inhibit set of putty
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7
Q

Rank these materials from low shrinkage to high - polyether, PVS, polysulfide, condensation silicones

A

Polyether < PVS < Polysulfides < Condensation silicones (which is why they need to be poured immediately)

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8
Q

Rank from low (1%) to high (3-6%) in terms of permanent deformation. polyether, PVS, polysulfide, condensation silicones

A
  1. PVS (low)
  2. Condensation silicones
  3. Polyether
  4. Polysulfide (high)
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9
Q

Rank rigidity

polyether, PVS, polysulfide, condensation silicones

A
  1. Polysulfide (flexible)
  2. Condensation silicones
  3. PVS
  4. Polyether (rigid)
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10
Q

Rank tear strength

polyether, PVS, polysulfide, condensation silicones

A
  1. Polyether (low tear strength)
  2. PVS / Condensation
  3. Polysulfides (high tear strength)
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11
Q

Rank setting time

polyether, PVS, polysulfide, condensation silicones

A
  1. PVS, polyether (4 minutes)
  2. Condensation silicones
  3. Polysulfides (10 minutes)
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12
Q

Polysulfides are what in terms of flexibility, tear strength, setting time, deformation

A
  1. Most flexible
  2. Highest tear strength
  3. Longest setting time
  4. Highest deformation
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13
Q

Polyethers are what in terms of shrinkage, setting time, deformation, tear strength, rigidity

A
  1. Low shrinkage
  2. Short setting time
  3. Average deformation
  4. Lowest tear strength
  5. Most rigid
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14
Q

Addition silicones are what in terms of shrinkage, permanent deformation, setting time, tear strength, rigidity

A
  1. Low shrinkage
  2. Low permanent deformation
  3. Short setting time
  4. Avg tear strength and rigidity
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15
Q

Polysulfides are great for what cases?

A
  1. Removable (dentures and distal rpd)
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16
Q

Polyethers are great for what cases?

A
  1. Triple tray
  2. Implants
  3. Minimal undercuts
17
Q

Addition silicones are great for what case?

A
  1. All fixed

2. All removable

18
Q

What are indicates for triple tray usage?

A
  1. Single unit
  2. When restoring in MI
  3. Stable, mutually protected occlusion
  4. Tray does not interfere with closing
  5. Must have posterior stop distal to tooth
19
Q

What is the goal of a final impression in fixed?

A

To capture the contours of the unprepared tooth apical to the preparation margin as well as all teeth in the arch and the soft tissues immediately surrounding the tooth prep

20
Q

ViscoStat functions through which chemical? How does it work? Acidic?

A

Fe2(SO4)3 - ferric sulfate
Precipitates blood proteins on contact
Very acidic (can cause tissue damage)

21
Q

Hemodent/Viscostat Clear functions through which chemical? How does it work?

A

Aluminum chloride

Constricts vessels and causes loss of fluid

Basic Fixed (6 decks)

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