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bds3 osce > DMS summary - impression materials > Flashcards

DMS summary - impression materials Flashcards

1
Q

What type of impression material is alginate

A

Irreversible hydrocolloid

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2
Q

What is the reversible hydrocolloid called

A

agar

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3
Q

What is the composition of alginate

A 
salt of alginic acid
calcium sulphate
trisodium phosphate
filler
modifiers
flavourings
chemical indications
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4
Q

What is the function of calcium sulphate

A

provides calcium ions

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5
Q

What is the function of trisodium phosphate in alginate

A

delays gel formation

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6
Q

What is filler for in alginate

A

strength

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7
Q

What are the two states of alginate

A

sol

gel

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8
Q

What are the useful properties of alginate

A

Non toxic and non irritant
Has okay flow
Nearly elastic

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9
Q

What are the not so useful properties of alginate

A

Poor flow
Prone to dimensional change
Poor tear strength

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10
Q

What is the word for release of water

A

syneresis

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11
Q

What is the word for release of water

A

imbibition

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12
Q

How are elastomers formed

A

cross linking

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13
Q

What are the types of elastomers

A

polysulphide
silicones
polyethers

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14
Q

What type of impression material is PVS

A

additional curing silicone

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15
Q

What are the properties of silicones

A 
Dimensionally stable
Hydrophobic
Variety of consistencies
Can be messy to use
Very accurate
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16
Q

What are the properties of polyethers

A 
Dimensionally stable
Hydrophilic
No variety of consistencies 
Can be messy to use
Very accurate
17
Q

What elastomers materials should only be used for masters

A

silicones + polyethers

18
Q
A

impression c

bds3 osce (65 decks)

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