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Dental Materials > Polymers > Flashcards

Polymers Flashcards

1
Q

denture base

A

acrylic resin

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2
Q

impression

A

elastomer

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3
Q

direct filling

A

complete resin

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4
Q

dental polymer

A

polyethylene

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5
Q

bonding in polymers

A

covalent and secondary bonding

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6
Q

control of polymer properties

A

Molecular weight, chemical composition, thermal properties, molecule structure

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7
Q

average molecular weight

A

number (n) of repeating unit (mer) x molecular weight of (mer)

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8
Q

number of repeating unit (mer)

A

degree of polymerization

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9
Q

degree of polymerization =

A

average Me/mer molecule weight

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10
Q

high degree of polymerization

A

longer polymer chains, more rigid, less soluble

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11
Q

low degree of polymerization

A

shorter polymer chains, less stiff, more soluble

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12
Q

covalent bonding as – electric conductivity

A

low

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13
Q

linear polymer has weak –

A

secondary bonding

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14
Q

– polymers have reversible transformation

A

thermoplastic

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15
Q

– polymers are irreversible

A

thermoset

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16
Q

heat thermoplastic polymer –>

A

softens it

17
Q

cool thermoplastic polymer –>

18
Q

heat thermoset polymer –>

A

hardens it

19
Q

thermoplastic polymers are –

A

linear with some branches

20
Q

thermoset polymers are – or –

A

crosslinked or networked

21
Q

thermoset are – than thermoplastics

A

harder, stronger and more brittle

22
Q

resin 1 phenol rings –>

A

shift central backbone

23
Q

resin 2 linear backbone –>

A

lower viscosity than resin 1

24
Q

resin 3 low Me and linear backbone –>

25
Q

the presence of – used to increase the strength and abscission resistance

26
Q

dental composite: polymer resin =

A

continuous phase

27
Q

dental composite: ceramic filler =

A

dispersed phase

Dental Materials (6 decks)

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