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CSA > clinical aspects of composite > Flashcards

clinical aspects of composite Flashcards

understand chemistry look at clinical techniques understand shortcomings understand clinical indications

1
Q

what is the chemistry of composite

A 
matrix
fillers
coupling agents
initiators and accelerators
pigments
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2
Q

what is the composite called if it is just resin matrix

A

unfilled resin

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3
Q

what are the two viscous monomers

A

BIS-GMA

UDMA

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4
Q

what are the two diluents

A

TEGDMA

HEMA

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5
Q

what is step 1

A

resin matrix

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6
Q

what is a matrix

A

Phase that polymerizes to form a solid mass

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7
Q

what are the properties of matrix

A

absorbs water stains and discolours

least wear resistance

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8
Q

what does step 2 include

A

Silica particles
Quartz
Glass (Ba, Sr, Zr)

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9
Q

what is it called when composite is made of resin matrix and filler particles

A

filled resin

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10
Q

what are composites classified by

A

by filler size( micro filled and nano filled)

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11
Q

what determines the surface smoothness

A

filler size

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12
Q

what does the change in particle size lead to

A

the rougher the surface

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13
Q

what does an increase in filler content lead to

A

increase hardness/strength
increase abrasion resistance
handling
aesthetics

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14
Q

what happens as the filler content decreases

A

the resin content decreases

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15
Q

what is step 3

A

the coupling agent

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16
Q

what happens in step 3

A

the filler particle which is the inorganic matrix binds to the the resin matrix which in organic

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17
Q

what is organosilane known as

A

a bifunctional molecule

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18
Q

what does the silane end bond to

A

OH group of the filler particle

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19
Q

what does the methacrylate end polymerise to

A

polymerises to resin

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20
Q

what is step 4

A

Optical modifiers/Pigments

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21
Q

what do Optical modifiers/Pigments do

A

provide translucency and opacity

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22
Q

what do the Optical modifiers/Pigments tend to be

A

metal oxides of titanium dioxide and aluminium oxide

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23
Q

what is the colour shading chart we use for teeth

A

vita classical

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24
Q

what materials are radiopaque

A

boron or zinc

25
Q

what do we need for a light activated composite- free radical activation

A

1.For light activated materials:
◦ Photo initiator - camphorquinone
◦ Amine accelerator (diethy-amino-ethyl-methacrylate)
◦ Polymerization inhibitor – hydroquinone (prevents setting during storage)

26
Q

what are examples that give the right wavelength of light

A

blue light emitting diode
plasma arch light
argon laser
halogen light

27
Q

what is the filler size of macro filled particles

A

8-12 micrometres

28
Q

what is the filler size of small particle

A

1-8 micrometres

29
Q

what is the filler size of hybrid

A

0.4-1 micrometres

30
Q

what is the filler size of micro filled

A

0.04-0.4 micrometres

31
Q

what is the filler size of nano hybrid

A

0.02-2.5 micrometres

32
Q

what is the filler size of nano filled

A

culsters 0.06-1.4 micrometres

33
Q

what is the disadvantages of composite

A

polymerisation shrinkage
technique sensitive- water control
doesn’t bond to a tooth- need a bonding agent

34
Q

what is shrinkage

A

the development of gaps

35
Q

what does shrinkage lead to

A

leads to sensitivity
secondary caries
staining

36
Q

what do we need for moisture control

A

good gingival health
cotton wool rolls
rubber dam

37
Q

Contra - Indications of composite

A

Where moisture control cannot be achieved • Subgingival restorations
• Composite polymerization is reduced in the presence of Eugenol (don’t use with ZoE)
Very deep restorations…pulpal irritation due to un set monomers…. (new materials/techiques/ place a linner).

38
Q

what are the stages in the bonding phase

A

Total etch – etch enamel and dentine for 15 seconds. Wash off all acid for at least 15 seconds
dry- slightly for 5-10 seconds

39
Q

what substance do we use to etch

A

37% phosphoric acid

40
Q

what changes in enamel occur when etching has taken place

A

creates micro porous layer
increases SA
increases wettability
increases surface energy

41
Q

what changes in dentine occur when etching has taken place

A

removes smear layer
unblocks and widens dentinal tubules orifices
exposes network of collagen fibres

42
Q

what do we need to use when bonding

A

apply primer
thin by drying slowly
light cure for 20-30 seconds

43
Q

what are bonding agents

A

chemicals that allow the composite to bond to teeth

the common used technique is 2 step-total etch followed by prime and bond

44
Q

what is the hybrid layer

A

is the ’zone’ of resin interlocking with demineralised dentine surface. responsible for micromechanical bonding between tooth and resin

45
Q

what wavelength of light is present in the light curing

A

450-490nM

46
Q

benefits of composite

A

sets material when you want

47
Q

disadvantages of composite

A

limited depth for curing only 2mm

48
Q

what is the oxygen inhibition layer

A

glossy film of uncured resin

49
Q

what can we use for tooth separation

A

Matrix strip and wedge

50
Q

what can matrix bands and wedges stop

A

to prevent bonding two adjacent teeth together and to help shape proximal surfaces

51
Q

what do we use to separate teeth on posterior surfaces

A

matrix bands

52
Q

what do we do after the restoration and and polishing

A

finishing and polishing

53
Q

what do we consider when finishing a tooth

A

removal of XS material and get the correct shape

54
Q

what can we use to finish a tooth

A

finishing burs

abrasive discs

55
Q

why do we polish a tooth

A

to get a high polish

56
Q

what do we use to polish a tooth

A

soflex discs

abrasives such as polishing points

57
Q

what are the different type of discs

A

course
medium
fine
superfine

58
Q

what are interproximal strips

A

used for removing overhangs

Insert and use below contact area to maintain proximal contact

CSA (51 decks)

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