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Dental materials > L7: glass ionomer cement > Flashcards

L7: glass ionomer cement Flashcards

1
Q

the “ glass in GIC refers to :

A

non crystalline glassy matrix

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2
Q

the “ ionomer” in GIC refers to :

A

ion crosslinked polymer

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3
Q

GIC is ____ based and ____ adhesive

A

water based self adhesive

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4
Q

filler in GIC :

A

Fluoroaluminosilicate glass powder

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5
Q

matrix of GIC:

A

Copolymer of carboxylic acid

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6
Q

how does GIC bond :

A

direct chemical bonding

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7
Q

special properties of GIC :

A

anti-cariogenic

can be used as bone substitute

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8
Q

biocompatibility of GIC?

A

Good biocompatibility but should be kept 0.5mm away from pulp

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9
Q

uses of GIC:

A

Type I luting cement

type II a : aesthetic restoration

type II b reinforced restorative

pit and fissure sealant

core build up ( resin and metal modfied)
prevention of carries

atruamatic restorative

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10
Q

liquid composition of GIC:

A

35-45% POLYACRYLIC ACID in water soultion : contains copolymers such as itaconic , maleic, tricarboxylic acid

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11
Q

uses of tartaric acid:

A

improves handling

decrease viscosity

increase working time

decrease setting time

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12
Q

GIC in relation to moisture?

A

should be protected using varnish because its sensitive

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13
Q

which component in glass particles is important for glass reactivity with polyacrylic acid?

A

aluminum

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14
Q

which 2 components of glass particles crosslink polyacrylic acid chain to form matrix ?

A

Ca and Al

Na and F particles do not participate –>

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15
Q

what happens to undissolved glass particles after dissolution of glass in liquid ?

A

undissolved particles are sheathed by silica-rich gel formed on glass

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16
Q

describe the 3 stages of GIC setting
-dissolution
-gelation
-hardening

A

dissolution :hydroxyl group (cooh) of polyacrylic liquid disolves glass particles —> releasing Ca Al F and Na partilces

gelation : gel is formed by cross linking of Ca and Al with liquid ( highly susceptible to moisture)

hardening : GIC gel transforms to hard material once Ca and Al ions complete initial crosslinking

17
Q

what is the role of water in GIC setting ?

A

provide a reaction medium

if water came in contact with GIC during the gelation stage —> Ca and Al ions will be washed away —> becomes weak

18
Q

disadvantages of conventional GIC:

A

low abrasive resistance

cannot be used for load bearing roles( inferior mechanical properties)

19
Q

thermal properties of GIC are similar to___

A

dentine

20
Q

what makes metal modified GIC different than the conventional GIC ?

A

Silver-tin metal alloy micro particles are incorporated in GIC powder( they do not bind with polymer matrix)

metal modified is weaker than conventional GIC

21
Q

RESIN-MODIFIED GIC curing and available as :

A

either dual cure : acid/base+light
or tricure: acid/base + light + chemical)

capsule , 2 paste system , powder/liquid system

22
Q

properties of resin modified GIC:

A

-releases fluoride
-higher bond strength than conventional GIC
-chemical adhesion
-high compressive strength
-HAS polymerizationshrinkage due to precense of resin

23
Q

what is contradicted for resin modified GIC?

A

direct pulp capping

24
Q

what factor can cause dimensional change of resin modified GIC?

A

DEHYDRATION

25
Q

how is translucency of resin modified GIC different than conventional GIC?

A

it is reduced due to different refractive index of glass powder and resin matrix

26
Q

compomer =

A

composite + GIC
Single paste , water free restorative

27
Q

compomer composition :

A

non reactive filler particles

reactive silicate glass particles

sodium fluoride

polyacid modified monomer (diester of HEMA + cARBOXYLIC ACID )

28
Q

setting reaction of modified GIC:

A

polymerization and absorbs water for slow acid/base reaction between acidic functional groups and silicate glass particles ( both self and light)

29
Q

how does modified compomer bind to tooth :

A

most of them require a dentine bonding agent

30
Q

resin cements are low viscosity versions of resin based composite

A
31
Q

which form of curing results in the best color stability ?

A

light curing

32
Q

special version of cement used for obturation to fill voids and promote seal , preventing micro leakage :

A

endodontic sealers

Dental materials (15 decks)

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