Resin Composites

Question 1

what is the resin matrix component of composite?

Answer 1

principle methacrylate monomers e.g BISGMA and a dilutent monomer e.g TEGMA

Question 2

what is the resin matrix component of composite?

Answer 2

principle methacrylate monomers e.g BISGMA and a dilutent monomer e.g TEGMA

Question 3

what is the filler in composite?

Answer 3

particles of silica based glass

Question 4

other components of composite?

Answer 4

silane coupling agent

pigments

Question 5

what is the activator in composite?

Answer 5

camphorquinone

Question 6

classifiations of composites?

Answer 6

conventional/macro
nanofilled/micro
hybrid

Question 7

what are high resin:filler composites like?

Question 8

what are high filler:resin composites like?

Answer 8

> 60% filler/volume

stronger, more wear resistance, shrink less, more opaque less vital appearance, hard to polish

Question 9

other type of composite?

Answer 9

hybrid

Question 10

what is the best type of composite?

Answer 10

nanofilled - micron sized particles
high strength
less shrinkage
high polishability
plus nano fibres to optimise resorative aesthetic abilities

Question 11

properties of composite?

Answer 11

non adhesive
requires bonding agent
hydrophobic
photophillic
polymerisation shrinkage

Question 12

what component of composite causes hypersensitivity reactions?

Answer 12

HEMA

Question 13

advantages of comopsite?

Answer 13

wear resistance/compressive strength
matches tooth substance
command set
good aesthetics - tooth coloured
bonded to tooth =conserves tooth

Question 14

disadvantages of composite?

Answer 14

polymerisation shrinkage 
moisture control = essential
can be brittle
no evidence to support use with large class II cavities
depth of cure only 2mm
hard to place

Question 15

how to overcome shrinkage?

Answer 15

hydrophobic = shrinks away from water = rubber dam
ramped output from light source
oblique increments
light tips, wedges, direct light to gingival floor

Question 16

when to do shade match?

Answer 16

when light is off tooth

Question 17

for anterior restorations why bevel enamel?

Answer 17

increased surface area for bonding

Question 18

how many composite shades for anterior teeth?

Answer 18

core shade = dentine

translicent shade = incisal edge

Question 19

why cure final increment under a matrix strip?

Answer 19

removes oxygen inhibited area

Question 20

make sure each increment?

Answer 20

only touches one wall of the cavity

Question 21

light cure wave length?

Answer 21

450-500nm

Question 22

rubber dam advantages?

Answer 22

airway protection
moisture control
protects and retracts the soft tissues
good visibility for working
prevents contamination of dental materials
infection control
patient comfort

Question 23

what is the filler in composite?

Answer 23

particles of silica based glass

Question 24

other components of composite?

Answer 24

silane coupling agent

pigments

Question 25

what is the activator in composite?

Answer 25

camphorquinone

Question 26

classifiations of composites?

Answer 26

conventional/macro nanofilled/micro hybrid

Question 27

what are high resin:filler composites like?

Question 28

what are high filler:resin composites like?

Answer 28

>60% filler/volume | stronger, more wear resistance, shrink less, more opaque less vital appearance, hard to polish

Question 29

other type of composite?

Answer 29

hybrid

Question 30

what is the best type of composite?

Answer 30

``` nanofilled - micron sized particles high strength less shrinkage high polishability plus nano fibres to optimise resorative aesthetic abilities ```

Question 31

properties of composite?

Answer 31

``` non adhesive requires bonding agent hydrophobic photophillic polymerisation shrinkage ```

Question 32

what component of composite causes hypersensitivity reactions?

Answer 32

HEMA

Question 33

advantages of comopsite?

Answer 33

``` wear resistance/compressive strength matches tooth substance command set good aesthetics - tooth coloured bonded to tooth =conserves tooth ```

Question 34

disadvantages of composite?

Answer 34

``` polymerisation shrinkage moisture control = essential can be brittle no evidence to support use with large class II cavities depth of cure only 2mm hard to place ```

Question 35

how to overcome shrinkage?

Answer 35

hydrophobic = shrinks away from water = rubber dam ramped output from light source oblique increments light tips, wedges, direct light to gingival floor

Question 36

when to do shade match?

Answer 36

when light is off tooth

Question 37

for anterior restorations why bevel enamel?

Answer 37

increased surface area for bonding

Question 38

how many composite shades for anterior teeth?

Answer 38

core shade = dentine | translicent shade = incisal edge

Question 39

why cure final increment under a matrix strip?

Answer 39

removes oxygen inhibited area

Question 40

make sure each increment?

Answer 40

only touches one wall of the cavity

Question 41

light cure wave length?

Answer 41

450-500nm

Question 42

rubber dam advantages?

Answer 42

``` airway protection moisture control protects and retracts the soft tissues good visibility for working prevents contamination of dental materials infection control patient comfort ```