composite resins

Question 1

name the 2 main ingredients in composite resins?

Answer 1

glass filler

resin material

Question 2

which is hard and which is soft, resin or glass filler?

Answer 2

glass filler is hard and resin is soft

Question 3

name the photo initiator in composite?

Answer 3

camphorquionone

Question 4

name the 3 classifications of composite filler particles?

Answer 4

conventional
microfilled
hybrid

Question 5

name the 2 setting classifications of composite

Answer 5

light

self cure

Question 6

name some types composite resin filler particles

Answer 6

conventional
microfine
fine hybrid

Question 7

which type of composite resin filler particle is most commonly used?

Answer 7

hybrid

Question 8

name a resin monomer used in composite?

Answer 8

BIS-GMA

Question 9

what is camphorquionone activated by?

Answer 9

blue light

Question 10

briefly describe what occurs to camphorquionone once it is activated by blue light?

Answer 10

released electrically charged radicals which initiate free radical addition polymerisation go BIS-GMA, changing resin properties

Question 11

which substance present in composite is added to adjust viscosity and slow down setting?

Answer 11

low weight dimethylacrylates

Question 12

which substance in composite allows good bonding between glass and resin?

Answer 12

silane coupling agents

Question 13

what effects does adding filler to composite have?

Answer 13

improved mechanical properties (strength, hardiness, rigidity)
improved aesthetic
increased abrasion resistance
lower thermal expansion (still not perfect)

Question 14

LED lights of what strength are most effective at curing composite?

Answer 14

450-470nm

Question 15

what are the advantages of light cure composite?

Answer 15

extended working time
immediate finishing
less waste

Question 16

what is the maximum depth of cure for composite?

Answer 16

2mm

Question 17

describe hardness?

Answer 17

is material surface resistant to scratching and indentation

Question 18

describe wear?

Answer 18

removal of surface layers when 2 surfaces make frictional contact

Question 19

loss of material surface layers and roughened surface is known as?

Answer 19

abrasion

Question 20

what is the typical bond strength for composite to enamel or dentine?

Answer 20

40MPa

Question 21

describe the thermal conductivity of composite?

Answer 21

low thermal conductivity - this is desirable

Question 22

describe the thermal expansion coefficient of composite?

Answer 22

high thermal expansion coefficient - this is not desirable

Question 23

describe the aesthetic of composite

Answer 23

good aesthetic - range if shades

Question 24

list some properties which affect choice of restorative material

Answer 24

mechanical porperties
bonding
thermal
aesthetic
handling
anticariogemic
radiopacity