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CSA SR > tooth coloured filling materials 2 > Flashcards

tooth coloured filling materials 2 Flashcards

1
Q

what are examples of cements

A

GIC
light cured glass ionomer cement
compomer
composite

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2
Q

what can cements be

A

hydrophilic

or hydrophobic

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3
Q

describe glass polyalkenoates

A

formed as the result of a acid base reaction lion between fluoride containing glass and a poly acid- usually poly acrylic acid
they are adhesive
cariostatic

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4
Q

what is the composition of glass polyalkenoates

A

fluoro-alumino-phospho-silicate glass polyacid

eg polyacrylic acid or polymaleic acid

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5
Q

what are the disadvantages of poly alkenoates

A 
technique sensitive 
moisture sensitive 
cannot be placed in stress bearing areas 
low tensile and fracture toughness
poor wear resistance 
average aesthetics
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6
Q

what does adding a acid + base equal

A

salt + water

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7
Q

what are the steps of the setting reaction

A 
decomposition 
migration 
gelation 
post set hardening
maturation
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8
Q

how does the glass polyalkenoate bind to the collagen fibres

A

h+ ions

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9
Q

how does the glass polyalkenoate bind to the tooth surface

A

calcium ions and al3+ ions in a process called chelation

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10
Q

what happens in the maturation stage

A

al3+ salts precipitate for 24 hours
the setting process can continue for unto a year but very slowly
the formation of poly salts is continued

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11
Q

what happens to fluoride ions

A

not an integral part of the matrix and can be released without upsetting the structure of the cement

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12
Q

what role does water play

A

slowly hydrates the mature cross linked matrix
this leads to increase strength
improved translucency
increased resistance to desiccation

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13
Q

what can XS water lead to

A

CONTAMINATION

therefore increased opacity and decreased hardness

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14
Q

what happens if there is less water

A

desiccation

and more cracking and grazing

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15
Q

when are fluoride ions released

A

released by the acid attack from the glass

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16
Q

what does fluoride help with

A

biocompatibility of the material
inhibit recurrent caries

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17
Q

how does fluoride release

A

a rapid initial process

then a second slower much sustained process responsible for the long term release of fluoride

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18
Q

what is the advantage of fluoride

A

prevents secondary caries as it promotes remineralisation

it is also the main reason for GIC replacement

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19
Q

what does plaque not thrive on

A

gic

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20
Q

why does strep mutans not grow on GIC

A

due to fluoride being present

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21
Q

examples of alternative cements

A

diamondcarve

diamond 90

22
Q

what is diamondcarve and diamond90 based on

A

based on glass and co polymer of
polyvinyl phosphoric acid
polyacrylic acid

23
Q

give examples vicious glass polyalkenoates

A

fuji IX, ketac Molar, Hi Dense

24
Q

describe vicious glass polyalkenoates

A

higher powder:liquid ratio
lower water content
smaller glass particles
used in ART technique

25
Q

what is the survival time on posterior teeth of amalgam

A

median survival time 11 years

26
Q

what is the survival time on posterior teeth of GIC

A

MEDIAN survival time of 6 years

27
Q

deserve resin modified GIC

A

RMGIC are glass ionomer cements with the addition of a small quantity of resin components

28
Q

what is the % of resin in set cement

A

4.5-6%

29
Q

what are the advantages of RMGIC

A

tooth coloured
improved aesthetics
medium fluoride release
shorter setting
decreased moisture
improved tensile strength
sets on command
better wear characteristics
easier to use
higher bond strength to composite
fewer steps than composite

30
Q

describe 2 modifications of conventional GICS

A

Less water can be used- it is replaced by a water/HEMA mixture called a vitremer

Modification of a poly acid with side chains that can polymerise by high curing mechanisms

31
Q

what does the polymer also contain

A

polymerisable functional groups of COO and COOH which can be cured with blue light

32
Q

what does HEMA stand for

A

hydroxyethylmethacrylate

33
Q

disadvantages of HEMA

A

irritating to the eye and known contact allergen

34
Q

how do we reduce the risk of allergic response to hema

A

minimise exposure

esp to uncured resin

35
Q

clinically what is important when handling HEMA

A

protective gloves and no touch technique

36
Q

what are the indications of RMGIC

A

cervical and root caries

base and abfraction lesions

37
Q

what are the advantages of RMGIC in terms of cervical and root caries, as a base or in a fraction lesions

A

resistant to desiccation
can be contoured immediately

38
Q

what is the composition of composites

A 
bis-GMA
UDMA 
EGDMA
inorganic filler
silane coupling agent 
uv stabilisers 
inhibitors
39
Q

What is dyract
composition of dyract

A

Compomer

UDMA resin
TCB resin
strontium fluorsilicate glass
initiators
stabilisers
~~~

40
Q

what are compomers made from

A

from from new monomers which contain acidic and acrylate groups

41
Q

what does the setting mechanism 1st stage include in compomers

A

light curing induces the polymerisation of the resins

42
Q

what does the setting mechanism 2nd stage include in compomers

A

after water uptake the acid base reaction takes place resulting in further cross linking of the matrix

43
Q

pros of the setting mechanism in compomers

A

excellent handling
command set
good strength

44
Q

cons of the setting mechanism in compomers

A

poor adhesion
low fluoride release
needs a bonding agent

45
Q

what is the tensile strength of Fuji IILC

A

45 MPa

46
Q

what is the tensile strength of VITREMER

A

75 MPa

47
Q

what is the tensile strength of dyract

A

95 MPa

48
Q

why do GPC restorations fail

A

due to recurrent caries

49
Q

what % of GPC restorations fail due to recurrent caries

A

50%

50
Q

describe chemfil rock

A

added zinc which makes it stronger tougher and earlier
no need to condition the cavity
no need to protect with varnish

51
Q

describe new bioactive RMGIC

A

It chemically bonds to teeth, seals against bacterial microleakage, releases more fluoride and is more bioactive than glass ionomers, and is more durable and fracture resistant than composites

CSA SR (52 decks)

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