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Dental Materials > Resin Composites 1 > Flashcards

Resin Composites 1 Flashcards

1
Q

what make up the resin matrix?

A

methacrylate or dimethacrylate monomers

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2
Q

what are examples of monomers

A

BISGMA

Urethane dimethacrylate

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3
Q

What are examples of co monomers?

A

TEGMA

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4
Q

What does TEGMA do?

A

controls viscosity

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5
Q

What else are present in resin composites?

A

inhibators

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6
Q

What do products based on silorane produce?

A

expansion that offsets shrinkage

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7
Q

what do c=c bonds take part in?

A

free radical polymerisation

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8
Q

What do unreacted monomers in resin composites allow for?

A

scope for chairside repair

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9
Q

What does the viscosity of the matrix polymer do?

A

reduces mobility of untreated monomers

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10
Q

What are two types of siloranes?

A

siloxanes

oxiranes

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11
Q

what do siloxanes contribute to resin composties?

A

factor of hydrophobicity

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12
Q

What do oxiranes contribute to resin composites?

A

ring opening polymerisation

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13
Q

catatonic cure?

A 
camphorquinone
iodium salt
electron doner
ring opening polymerisation
allows for less shrinkage
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14
Q

what are fillers?

A

quartz
silica
glasses

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15
Q

What are glasses in resin composites?

A

aluminasilicates
bora silicate
barium oxide

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16
Q

what are coupling agents?

A

methacryloxypropyltrimethoxysilane

silane interacts and bonds with glass

17
Q

What does high filler content mean?

A

higher surface hardness

18
Q

what does high filler content mean re. volume setting contraction?

A

higher filler the lower % of volume setting contraction

19
Q

The higher filler means what to thermal expansion?

A

higher filler, the less co efficient of thermal expansion

20
Q

what does camphorquinone do re. polymerisation

A

yields necessary free radical to start polymerisation

21
Q

at what level does camphorquinone become excited?

A

40-60 nm- visable blue light

22
Q

What is blue light most readily generated by?

A

quartz halogen lights

23
Q

What is the downside to resin in composite?

A

susceptible to shrinkage upon polymerisation

24
Q

what are resins?

A

modified methacrylate/acrylate

oxirane- ring opening

25
Q

what is the function of the filler>

A

shock absorber

26
Q

What is the function of the coupling agent?

A

transfers stress from loading from rigid riller to more flexible and ductile matrix

27
Q

What are the types of resin composites?

A

conventional- used for posterior/ occlusal restoration
micro filled- anterior
hybrid
nano composites

28
Q

What other properties are there to resin composite?

A

gradual set from outer surface

required incremental cure

29
Q

with increased porosity?

A

less strength

less fatigue

30
Q

with decreased coupling?

A

less strength

less fatigue

31
Q

What is cfactor?

A

measure of bond strength

number of bonded surface/number of unbonded surfaces

Dental Materials (13 decks)

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