Dental Materials > Chapter 8 Impressions > Flashcards

Chapter 8 Impressions Flashcards

(17 cards)

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1
Q

What is a model vs a cast?

A

A model is a representation that may or may not be the same size
A cast is meant to be a near exact replication in size

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2
Q

What is a cast of a single tooth called?

A

A die

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3
Q

T/F a cast can have one die ot multiple dies?

A

True

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4
Q

What are impression trays used for?

A

carry and support the material

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5
Q

What are the different types of impression trays?

A
  1. Stock tray
  2. custom impression trays
  3. stock edentulous
  4. Bite registration
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6
Q

What are the qualities of impression material ?

A
  • excellent detail reproduction
  • good tear strength
  • no distortions when removed from the mouth
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7
Q

What are the different types of classification of impression materials in inelastic rigid?

A
  • impression plaster
  • wax and dental compound
  • Zinc oxide-eugenol (ZOE)
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8
Q

What are the different types of classification of impression materials in elastic ?

A

Alginate
Agar
Polysulfide
Polyvinyl Siloxane (PVS)
Polyether

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9
Q

What is alginate?

A

Irreversible hydrocolloid
Hydrophilic
hygienist mostly deals with this type

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10
Q

what does alginate contain?

A
  • silica filler to give body
  • calcium sulfate (reactor)
  • sodium phosphate as retarder
  • colorants
  • flavor
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11
Q

What are the advantages of alginate?

A
  • Hydrophilic (loves water)- reduces air bubbles from oral fluids and pouring dental stone
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12
Q

What are the disadvantage of alginate?

A
  • water evaporates and impressions shrinks (SYNERSIS)
  • CAN ABSORB WATER AND SWELL (imbibition)
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13
Q

What is syneresis?

A

loses water and shrinks

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14
Q

What is imbibition ?

A

Takes on/uptake of water and swells

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15
Q

What are the two phases of alginate?

A
  • Sol
  • Gel
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16
Q

What is the pouring time for alginate?

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A

No more than 30 minutes after impression is taken

17
Q

What are other types of impression material?

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A
  • Polysulfides
  • Condensation silicones
  • Addition Silicones
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