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CSA SR > clinical aspects of GIC > Flashcards

clinical aspects of GIC Flashcards

1
Q

what is silicate cement

A

glass powder mixed with phosphoric acid to produce a hard material

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2
Q

what are the disadvantages of silicate

A

not aesthetic

low wear resistance

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3
Q

what was the best restorative material in 1971

A

gold

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4
Q

what is the updated version of silicate

A

glass powder mixed with poly carboxylic acid

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5
Q

benefits of updates silicate

A 
set harder 
tooth coloured 
more wear resistant 
released fluoride 
chemically bonded to enamel and dentine
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6
Q

what do we call the glass ionomer

A

ion leachable glass

chemical elements can dissolve out

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7
Q

what is the 3 stages of the setting reaction

A

dissolution
gelation/hardening
maturation

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8
Q

dissolution stage 1

A

add water to the poly acid chain-> when you add water, H+ ions become liberated from the acid and leave this leaves negatively charged carboxyl groups on the polyacid chains

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9
Q

what is the glass particles made up of

A

silica and calcium alunimum fluoride and other make it radiopaque and tooth coloured-

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10
Q

what is the glass particles called

A

calcium alumno- fluoro- silicate glass

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11
Q

dissolution stage 2

A

when the h+ ions from the polyacid come into contact with the glass they erode the glass and release the ions into solution

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12
Q

dissolution stage 3

A

negatively charged carboxyl group on polyacid binds to calcium and aluminium

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13
Q

what occurs in the final stage of dissolution

A

cross linking of poly acid chains and the fluoride which was bound to calcium or aluminium is released off into solution

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14
Q

how long does it take for the paste to harden

A

4-5 minutes

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15
Q

what is the maturation phase

A

the ca and alundum keep forming cross links makes it even stronger

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16
Q

what consequence could happen in the maturation stage

A

the poly acids could not bind to al or ca and could free float into the saliva- leaving it weak

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17
Q

what can prevent polyacid floating into the saliva

A

coating of varnish or bonding resin

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18
Q

benefits of GIC

A

easy to use- doesnt need to bond or moisture control
chemically bonds to enamel or dentine
releases fluoride

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19
Q

how does gic adhere to dentine

A

chemical
some h+ ions come into contact with the tooth surface and that releases calcium and phosphate in the apatite and that diffuses off and the Ca and Al from GIC diffuse into the tooth

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20
Q

what is dentine conditioning

A

used to remove the smear layer of dentine

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21
Q

what is dentine conditioner

A

10% polyacrylic acid
leave for 20 seconds
Wash off well
dry (10 seconds)

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22
Q

what is the % gap free margins when conditioner was not used after 100000 chewing cycles

A

50

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23
Q

what is the % gap free margins when conditioner was used after 100000 chewing cycles

A

90

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24
Q

what is a gap free margin

A

where the gig has stayed in good contact with the tooth surface

25
Q

what happens to fluoride being released

A

released fast at the start but decreases and plateaus as time goes on

26
Q

what percentage of GIC restorations have been removed due to secondary caries

A

50% of 790

27
Q

what can happen to gic and fluoride toothpaste

A

the GIC can absorb the fluoride from toothpaste and mouthwash and then release it- this is called fluoride recharging

28
Q

disadvantage of GIC

A

weak compared to other materials
poor aesthetics compared to composite
poor survival time

29
Q

what can happen to GIC overtime

A

it can change colour

30
Q

what is the median survival time of GIC

A

6.4 years

31
Q

what discovery happened in 1985

A

silver cement

32
Q

what is silver cement

A

amalgam powder added to GIC-

33
Q

what was it thought the amalgam powder would do to the GIC

A

strength

and wear resistance only bought poor aesthetics

34
Q

what did we find about silver cermet

A

more resistant to acid attack
lower flexural strength
more prone to abrasion

35
Q

what discover was made in 1989

A

resin modified GIC- added HEMA to the glass ionomer

36
Q

where else is HEMA found

A

in the bonding agent

37
Q

which light does hema polymerise under

A

Blue light

38
Q

how can HEMA be added

A

as a liquid or chemically to bond with the carboxylic acid groups on some of the polyacid chains

39
Q

benefits of RMGIC

A

BETTER aesthetics
command set
more resistant to losing ions during maturation

40
Q

what happens when we go through the maturation stage in RMGIC

A

we shine a light on it and everything fixes into place

41
Q

disadvantages of GIC

A

when light cured fluoride ions not released as it is fixed into place and no H+ ions released and therefore no more cross links

42
Q

disadvantages of RMGIC

A

do not release fluoride after cured
polymerised shrinkage
not suitable for post teeth

43
Q

what does the fluoride release curve look like for RMGIC

A

releases but then flattens and cannot be fluoride recharged

44
Q

what development came along in 1990

A

to add smaller glass particles- occupy more of the space

45
Q

examples of high density materials

A

fuji 9

ketac molar aplicap

46
Q

issues with current GIC

A

weak
complicated to use- conditioning and coating
waiting time-sticky first but shortworkable time
RMGIC cease to act like GIC when cured

47
Q

what is the newest development of GIC

A

zinc reinforcement

48
Q

what happens in zinc replacement

A

calcium ions replaced by zinc- and zinc brings more strength

49
Q

example of GIC with zinc replacement

A

chemfil rock

50
Q

benefits of chemfil rock

A

better wear resistance
bonds to enamel and dentine
no conditioning
no varnish required

51
Q

which patients is chemfil rock good for

A

children

52
Q

how do we use chemfil rock

A

inject it
pack it
remove XS

53
Q

how long can chemfil rock last

A

a few months maybe years

54
Q

what happens in the mauration stage of chemfil

A

further cross liking
fluoride release
fluoride recharge

55
Q

disadvantages of chemfil rock

A

poor aesthetics- too white not tooth coloured

56
Q

what do we use for cavities which are subginigval

A

RMGIC- due to poor moisture control

57
Q

how long for Gic can be used for

A

temporary restoration- so we can remove the restoration as it is not completely tooth coloured
without removing sound tissue

58
Q

what colour is fuji triage

A

pinky orange

CSA SR (52 decks)

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