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Dental Materials > polymers > Flashcards

polymers Flashcards

1
Q

the extent to which all (entire) monomer is polymerized

A

degree of conversion

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2
Q

Two molecules react to form a larger molecules with

elimination of a small molecule

A

condensation polymerization

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3
Q

free radicals react with double bond of a monomer for

A

crosslinking

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4
Q

– is activated with light

A

camphoroquinone (CQ)

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5
Q

added to polymer to modify the physical properties

A

plasticizer

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6
Q

Minimize or prevent spontaneous or accidental

polymerization of monomers

A

inhibitors

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7
Q

Polymers containing two or more chemically different
types of monomer units to create different polymer
properties

A

copolymer

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8
Q

low MW monomer =

A

diluent

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9
Q

condensation polymerization –> like water and alcohols

A

byproducts

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10
Q

condensation polymerization –> – dimensional stability

A

low (shrinkage)

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11
Q

Two molecules react to form a larger molecule without

the elimination of a small molecule

A

additional polymerization (no byproduct)

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12
Q

additional polymerization –> – in composition

A

no change

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13
Q

additional polymerization –> – dimensional stability

A

better

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14
Q

examples of additional polymerization

A

free-radical and ring opening

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15
Q

most dental resins are formed from –

A

additional polymerization

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16
Q

silicone impression material

A

condensation polymerization

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17
Q

most common type of additional polymerization

A

free radical

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18
Q

CQ absorbs light and –

A

releases free radicals

19
Q

activator of CQ

A

blue light

20
Q

accelerator of CQ

A

DMAM

21
Q

Do plasticizers participate in the polymerization rxn?

A

no

22
Q

do plasticizers become part of polymer chain?

A

no

23
Q

plasticizers – attraction between polymer chains

A

reduce

24
Q

plasticizers – the polymer

A

softens (more flexible)

25
Q

dibutyl phthalate makes denture polymer rubbery

A

plasticizer

26
Q

free radical scavengers

A

oxygen, HQ, MEHQ, BHT

27
Q

main inhibitor for most systems

A

oxygen

28
Q

very efficient inhibitor but causes discoloration

A

HQ

29
Q

MEHQ is an –

A

excellent inhibitor

30
Q

BHT produces – discoloration

A

less

31
Q

MMA + Butyl methacrylate –> –

denture bases

A

resist fracture

32
Q

MMA + Octyl methacrylate –> –

A

soft and flexible (denture soft

liner)

33
Q

MMA + Hydroxyethyl methacrylate  –>

A

increased wettability

patients with xerostomia; dry mouth

34
Q

most common high MW monomer

A

Bis-GMA

35
Q

core Bisphenol-A of Bis-GMA provides

A

high strength

36
Q

terminal methacrylate groups of Bis-GMA provide sites for –

A

free radical polymerization

37
Q

– need to be diluted with a thinning monomer to be easily placed and manipulated

A

Bis-GMA

38
Q

Low MW monomers

A

MMA and TEGDMA

39
Q

what is CQ and BPO?

A

initiators

40
Q

high degree of conversion

A

fewer residual monomers

41
Q

low degree of conversion

A

more residual monomers

42
Q

most common acrylic polymer

A

PMMA

43
Q

PMMA was introduced as –

A

denture base materials

Dental Materials (6 decks)

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