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BDS4 DMS Exam Prep > Impression Materials > Flashcards

Impression Materials Flashcards

1
Q

What are 3 classifications of impression materials?

A

Non elastic

Elastic hydrocolloids

Elastic elastomers

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2
Q

What is two examples of non elastic impression materials?

A

Compound
ZOE

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3
Q

What are two examples of elastic hydrocolloids?

A

Agar
Alginate

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4
Q

What are 3 examples of elastic elastomers?

A

Addition silicones (PVS, light, med body)
Polyethers (impregum)
Condensation silicones

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5
Q

What are the ideal properties of an impression material?

A

Biocompatible
Non irritant, non toxic
Acceptable taste and smell
100% elastic recovery
accurate surface detail reproduction
elastic
operator convenient - easy to use and mix
unaffected by moisture

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6
Q

What is alginate?

A

Elastic hydrocolloid that is used to take impressions for primary imps for dentures or to take imps for study casts

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7
Q

What are some advantages of alginate?

A

Cheap
Fast setting time
Can adjust setting time
Relatively good surface detail reproduction
elastic properties so can be used in undercuts

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8
Q

What are some disadvantages of alginate?

A

Mucocompressive - not good if flabby ridge etc
Not accurate enough for imps for cornws/bridges
poor dimensional stability
poor tear resistance

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9
Q

What is alginate composed of?

A

Sodium alginate
Silicate powder
Calcium phosphate
Colours
Flavours

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10
Q

What is impression compound?

A

Non elastic impression material used in edentulous cases along with green stick to get accurate impression of the ridge

it is mucocompressive

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11
Q

What is impression compound made of?

A

Resin
Wax
Filler

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12
Q

What are advantages of compound?

A

Mucocompressive - good impression in edentulous pt
can alter setting time

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13
Q

What are advantages of compound?

A

Mucocompressive - good impression in edentulous pt
can alter setting timeW

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14
Q

What are disadvanatges of compound?

A

Rigid - avoid deep undercuts
Poor dimensional stability
mucocompressive so poor on flabby ridges
poor reproduction of surface detail

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15
Q

What is polyether?

A

This is an elastic elastomer and example is impregum

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16
Q

Advanatges of polyether?

A

Accurate surface detail reproduction
dimensionally stable
non toxic
non irritant
adequate tear resistance

17
Q

Disadvantages of polyether?

A

Rigid - sets in undercuts so caution
Difficult to remove
long setting time - 3 mins

18
Q

What are additon silicones?

A

Elastic elastomers - examples include PVS light body and medium body

19
Q

What are advantages if addition silicones?

A

Good elastic recovery
high dimensional stability (no shrink)
accurate surface reproduction
good tear resistance
come in variety of forms

20
Q

Disadvantages of addition silicones?

A

Expensive
teeth must dry or else air blows

BDS4 DMS Exam Prep (7 decks)

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