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Flashcards in Resin Composites 1 Deck (31):
1

what make up the resin matrix?

methacrylate or dimethacrylate monomers

2

what are examples of monomers

BISGMA
Urethane dimethacrylate

3

What are examples of co monomers?

TEGMA

4

What does TEGMA do?

controls viscosity

5

What else are present in resin composites?

inhibators

6

What do products based on silorane produce?

expansion that offsets shrinkage

7

what do c=c bonds take part in?

free radical polymerisation

8

What do unreacted monomers in resin composites allow for?

scope for chairside repair

9

What does the viscosity of the matrix polymer do?

reduces mobility of untreated monomers

10

What are two types of siloranes?

siloxanes
oxiranes

11

what do siloxanes contribute to resin composties?

factor of hydrophobicity

12

What do oxiranes contribute to resin composites?

ring opening polymerisation

13

catatonic cure?

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

14

what are fillers?

quartz
silica
glasses

15

What are glasses in resin composites?

aluminasilicates
bora silicate
barium oxide

16

what are coupling agents?

methacryloxypropyltrimethoxysilane
silane interacts and bonds with glass

17

What does high filler content mean?

higher surface hardness

18

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

higher filler the lower % of volume setting contraction

19

The higher filler means what to thermal expansion?

higher filler, the less co efficient of thermal expansion

20

what does camphorquinone do re. polymerisation

yields necessary free radical to start polymerisation

21

at what level does camphorquinone become excited?

40-60 nm- visable blue light

22

What is blue light most readily generated by?

quartz halogen lights

23

What is the downside to resin in composite?

susceptible to shrinkage upon polymerisation

24

what are resins?

modified methacrylate/acrylate
oxirane- ring opening

25

what is the function of the filler>

shock absorber

26

What is the function of the coupling agent?

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

27

What are the types of resin composites?

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

28

What other properties are there to resin composite?

gradual set from outer surface
required incremental cure

29

with increased porosity?

less strength
less fatigue

30

with decreased coupling?

less strength
less fatigue

31

What is cfactor?

measure of bond strength
number of bonded surface/number of unbonded surfaces