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Management of Dental Caries > Resin Composites 1 > Flashcards

Resin Composites 1 Flashcards

1
Q

what is a silicates

A

earliest form tooth coloured restorative

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2
Q

what makes a silicate

A

product of acid base reaction = salt + water between
aluminosilicate glas
phosphoric acid

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3
Q

what does silicate release

A

fluoride

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4
Q

what are some features of silicate

A

moisture sensitive
erosion prone
brittle

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5
Q

what are acrylics used fro

A

make dentures

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6
Q

what are acrylics dept on

A

P:L mixing raio crucial

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7
Q

what does chemical setting mean

A

woking time is limited

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8
Q

what si the powder used to make acrylics

A

Pmma beads no greater than 50 Um

  • chemical initiator
  • peroxide
  • pigment
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9
Q

what si the liquid used in making acrylics

A

Mme monomer
chem activator
tertiary amine

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10
Q

what is he setting reaction

A

free radical addition polymerisation

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11
Q

what can cause a yellow tinge after time in acrylics

A

leftover tertiary amine in system

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12
Q

how does the size of the Pmma beads in acrylic affect reaction

A

tiny beads - accelerate reaction
large - retard set
size affects how light scatters off material

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13
Q

what are the sub parts of the free radial addition polymerisation

A

activation
initiation
propagation
termination

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14
Q

what si the activation

A

benzoyl peroxide cleaved by heat to sp temp

add tertiary amine

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15
Q

what is the initiation

A

when in contact with active species will link up form this

free bonds wan to grow and link similar mols

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16
Q

what is the propagation

A

ends of chain ahem free ends continue to add

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17
Q

what is termination

A

when chain attaches to impurity/ free radical or father growing chinas

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18
Q

what happens to the material with polyemridataion

A

material contracts

- may = gaps

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19
Q

is the poly exo or endothermic

A

exothermic

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20
Q

what re acrylics like compared to silicates

A

less

  • prone to erosion
  • soluble
  • acidic
  • brittle
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21
Q

what do acrylics exhibit

A

lower thermal diffusity

- can tolerate hot or cold pulpal sensitivity

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22
Q

what does eugenol do in contact with acrylics

A

impairs polymeirsation

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23
Q

what are inert fills used to do

A

reduce shrinkage

weaken material

24
Q

what are the components of composite

A

BIS GMA resin matrix
coupling agent
filler particles

25
Q

what is the definition of a resin composite

A

comb of 2 chem diff materials with distinct interfaces sep components and have properties count be achieved by any component acting alone

26
Q

resin composiites aka

A

rained acrylics free radical addition polymerisation

27
Q

what are the early products mixd together for composite

A

limited working time

incur porosity

28
Q

what means command cuing

A

later light curing technology

29
Q

whats the resin matrix of composite based upon

A

methacrylate

BIS GMA

30
Q

what are the comonomer is resin matrix

A

TEGMA
control visc
- filter addition
inhibitors

31
Q

what does the viscosity of the matrix polymer do

A

reduces mobility of uneducated monomers
C=C free radial poly
ring opens occur

32
Q

composite says for chair side repair how?

A

rough surface expo unset monomers and bond new monomers to

33
Q

what are siloxanes

A

group hug one circle pulls others
siloxanes - hydrophobicity
oxiranes (ring open poly)

34
Q

what is cationic cure

A

iodimum salt
electron donor
ring open poly
less shrinkage

35
Q

what re some common fillers for composites

A

quartz
silica
glasses

36
Q

what are some glasses use for fillers

A

aluminosilicates
boro silicate
barium oxide

37
Q

what is the coupling agent used in resin composites

A

gamma - methacryloxypropyltrimethoxysilane

38
Q

what is imp about coupling agent

A

difunctional
methacrylate chacteristsics
silane interacts and bods with glass
good wetting

39
Q

what sit he chemical activation used in resin composites

A

powder liwuid
paste liquid
encapsulated - capsules rupture = contact with eachother

40
Q

what si the light activation of resin composites

A

early ones UV - health risk
now CAMPHORQUINONE -
- protect eyes
- set under operating light to extent

41
Q

what doe camphorquinone do

A
  • have free radicals to start polymerisation
  • excited @ wavelength 460/80nm
  • visible blue light
  • ben by quartz halogen lights
42
Q

what happen to resin when poly

A

shrinks

43
Q

what can be added resin to prevent as much shrinkage

A

methacrylate

oxirane - expand open ring reaction

44
Q

what is needed with res and filler to work

A

coupling agent

45
Q

what is filler also regarded as

A

shock abs

46
Q

what are the methods of activation

A

chemical r light

47
Q

what are the types of resin composites

A

conventional
microfilmed
hybrid
nano composites

48
Q

what are some handling characteristics of resins

A

packable - viscous

flowable - more fluid/less filler

49
Q

what si type 1 resin composite

A

restore of cavities involving occlusal surfaces

50
Q

what is type 2 resin composite

A

all other polymer based filling and restorative materials

51
Q

what are properties considered fr resin composites

A
  • Biocompatible
  • visc increases when leave tube
  • exothermic set
  • setting contraction
  • thermal diffusely
52
Q

what can increase working time

A

if light activated

incremental cure

53
Q

what physical properties consider more

A

tensile and flexural more imp than compressive

54
Q

what is tribology

A

changes with function and loss of resin rich over layer

55
Q

when considering thermal property what else is to be considered

A

thermal proportional to filler

mechanical

56
Q

does cavity shape influence overall success of restiration

A

yes

C factor = NO.bonded surfaces/NO. unbonded surfaces

Management of Dental Caries (5 decks)

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