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clinical aspects of GIC Flashcards

1
Q

when was GIC invented

A

1971

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2
Q

what is silicate cement

A

glass powder mixed with phosphoric acid to produce a hard material

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3
Q

what are the disadvantages of silicate

A

not aesthetic

low wear resistance

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4
Q

what was the best restorative material in 1971

A

gold

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5
Q

what is the updated version of silicate

A

glass powder mixed with poly carboxylic acid

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6
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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7
Q

what do we call the glass ionomer

A

ion leachable glass

chemical elements can dissolve out

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8
Q

what is the 3 stages of the setting reaction

A

dissolution
gelation/hardening
maturation

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9
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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10
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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11
Q

what is the glass particles called

A

calcium alumno- fluoro- silicate glass

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12
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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13
Q

dissolution stage 3

A

negatively charged carboxyl group on polyacid binds to calcium and aluminium

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14
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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15
Q

how long does it take for the paste to harden

A

4-5 minutes

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16
Q

what is the maturation phase

A

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

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17
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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18
Q

what can prevent polyacid floating into the saliva

A

coating of varnish or bonding resin

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19
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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20
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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21
Q

what is dentine conditioning

A

used to remove the smear layer of dentine

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22
Q

what is dentine conditioner

A
  • by 10% polyacrylic acid leave for 20 seconds and dry
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23
Q

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

A

50

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24
Q

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

25
what is a gap free margin
where the gig has stayed in good contact with the tooth surface
26
what happens to fluoride being released
released fast at the start but decreases and plateaus as time goes on
27
what percentage of GIC restorations have been removed due to secondary caries
50% of 790
28
what can happen to gic and fluoride toothpaste
the GIC can absorb the fluoride from toothpaste and mouthwash and then release it- this is called fluoride recharging
29
disadvantage of GIC
weak compared to other materials poor aesthetics compared to composite poor survival time
30
what can happen to GIC overtime
it can change colour
31
what is the median survival time of GIC
6.4 years
32
what discovery happened in 1985
silver cement
33
what is silver cement
amalgam powder added to GIC-
34
what was it thought the amalgam powder would do to the GIC
strength | and wear resistance only bought poor aesthetics
35
what did we find about silver cement
more resistant to acid attack lower flexural strength more prone to abrasion
36
what discover was made in 1989
resin modified GIC- added HEMA to the glass ionomer
37
where else is HEMA found
in the bonding agent
38
which light does hema polymerise under
Blue light
39
how can HEMA be added
as a liquid or chemically to bond with the carboxylic acid groups on some of the polyacid chains
40
benefits of RMGIC
BETTER aesthetics command set more resistant to losing ions during maturation
41
what happens when we go through the maturation stage in RMGIC
we shine a light on it and everything fixes into place
42
disadvantages of GIC
when light cured fluoride ions not released as it is fixed into place and no H+ ions released and therefore no more cross links
43
disadvantages of RMGIC
do not release fluoride after cured polymerised shrinkage not suitable for post teeth
44
what does the fluoride release curve look like for RMGIC
releases but then flattens and cannot be fluoride recharged
45
what development came along in 1990
to add smaller glass particles- occupy more of the space
46
examples of high density materials
fuji 9 | ketac molar aplicap
47
issues with current GIC
weak complicated to use- conditioning and coating waiting time-sticky first but shortworkable time RMGIC cease to act like GIC when cured
48
what is the newest development of GIC
zinc reinforcement
49
what happens in zinc replacement
calcium ions replaced by zinc- and zinc brings more strength
50
example of GIC with zinc replacement
chemfil rock
51
benefits of chemfil rock
better wear resistance bonds to enamel and dentine no conditioning no varnish required
52
which patients is chemfil rock good for
children
53
how do we use chemfil rock
inject it pack it remove XS
54
how long can chemfil rock last
a few months maybe years
55
what happens in the mauration stage of chemfil
further cross liking fluoride release fluoride recharge
56
disadvantages of chemfil rock
poor aesthetics- too white not tooth coloured
57
what do we use for cavities which are subginigval
RMGIC- due to poor moisture control
58
how long for Gic can be used for
temporary restoration- so we can remove the restoration as it is not completely tooth coloured without removing sound tissue
59
what colour is fuji triage
pinky orange

CSA (51 decks)

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