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Dental Materials > Glass polyalkenoates > Flashcards

Glass polyalkenoates Flashcards

1
Q

what are glass polyalkenoates derived from?

A

silicate cements

polycarboxylate cements

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2
Q

re. polycarboxylate cements what reacts with what?

A

zinc oxide reacts with polycarboxylic acid

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3
Q

what replaced zinc oxide?

A

ion leachable glass

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4
Q

describe setting reaction re. glass polyalkenoate

A

glass contacts acid
glass has chord structure
outer surface rich in calcium
initial setting on calcium ions as predominant on outer surface of glass

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5
Q

what else is involved re. setting reaction of glass polyalkenoate?

A

aluminium

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6
Q

why reacts with calcium first?

A

calcium on outer layer

calcium ions more mobile in solution to move toward acid

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7
Q

what are the three mechanisms of setting re glass polyalkenoate?

A

concentration gradiet
mobility
transport analogy re. 2 + / 3+

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8
Q

what is powder component of glass polyalkenoate?

A

sodium aluminosilicate glass with calcium fluoride

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9
Q

what % calcium fluoride in glass polyalkenoate?

A

20

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10
Q

what does porosity cause?

A

stress, crack, inferior properties

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11
Q

what does a higher viscous cement mean re. porosity?

A

higher viscosity, lower porosity

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12
Q

mixing by hand means what with porosity?

A

less porosity

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13
Q

how does glass polyalkenoate bond to tooth?

A

with calcium ions

also to collagen by hydrogen bonding and metallic ion bridging

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14
Q

what may boost bonding?

A

tooth cleanser- citric acid- removes smear layer

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15
Q

what increases bonding strength?

A

polyacrylic acid

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16
Q

what is a cermet?

A

silver pellatized mixture of glass and metal particles

17
Q

in modified composites what replaces filler?

A

aluminosilicate glass

18
Q

what is a giomer?

A

composition as for composite but aluminosilicate glass is pre reacted with poly acid

19
Q

two types of giomers?

A

surface reaction

full reaction

20
Q

what is liquid re. glass polyalkenoate?

A

aqueous solution of acrylic / itaconic acid copolymer plus tartaric acid to control setting

Dental Materials (13 decks)

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