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Dental Materials > Glass Polyalkenoates > Flashcards

Glass Polyalkenoates Flashcards

1
Q

Where are glass polyalkenoates derived from?

A

silicate and polycarboxylate cements

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2
Q

What are glass polyalkenoates used for?

A

Crowns and severely broken down teeth

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3
Q

What are the old contents of glass polyalkenoate cements?

A

zinc oxide powder
polyacrylic acid liquid

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4
Q

What is zinc oxide replaced with in the new formula?

A

glass polyalkenoate (glass ionomer)

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5
Q

What 3 forms do glass ionomer cements come in?

A
  1. powder and liquid
  2. powder and water
  3. encapsulated
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6
Q

What is a glass ionomer cement?

A

silicate glass and water soluble acidic polymer

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7
Q

When are glass ionomer cements used?

A

paediatric restorations

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8
Q

Why are glass ionomer cements the material of choice in patients with high caries risk?

A

fluoride release

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9
Q

What is the setting reaction for glass ionomer cements?

A

acid base reaction which results in a siliceous hydrogel, glass particle and water

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10
Q

What makes glass ionomer cements tooth coloured?

A

unreacted glass cores reflect the colour of tooth and transmit light

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11
Q

What releases fluoride in glass ionomer cements?

A

glass

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12
Q

What time is the initial set of glass ionomer cements?

A

3 minutes

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13
Q

What particle predominates during the initial set of glass ionomer cements and why?

A

Ca2+ - on the outer surface of glass particle and has smaller ionic radius

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14
Q

What time is the final set of glass ionomer cements?

A

24 hours

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15
Q

What particle predominates the final set of glass ionomer cements?

A

Al3+

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16
Q

Before the final set of glass ionomer cements, what must be avoided?

A

moisture

17
Q

How do you protect the glass ionomer cement before the final set?

A

varnish or unfilled resin
- Vaseline as a lubricant when polishing

18
Q

How can you reform a glass ionomer cement?

A

mix with water or dilute solution of the acid

19
Q

What may increase the adhesion of glass ionomer cements?

A

tooth cleanser - citric acid

20
Q

What makes a resin modified glass ionomer cement?

A

small addition of light-curing resin

21
Q

What are the advantages of using RMGIC’s?

A
  • varnish not required
  • work faster
  • expand in water
22
Q

What is the advantage of RMGICs expanding in water?

A

helps seal cavity

23
Q

How are RMGICs set?

A

light cure

24
Q

What is HEMA?

A

an important component of RMGICs that enables resin and acid to co-exist in aqueous solution

25
Q

How should RMGICs be applied?

A

rapidly in small increments

26
Q

What is a giomer?

A

a modified glass ionomer
- fluoride release of GI
- resin composite aesthetic

27
Q

What are the 2 giomer reaction types?

A
  1. surface reaction
  2. full reaction
28
Q

What condition allows giomers to have greater fluoride release?

A

low pH

29
Q

What are advantages of giomers?

A
  • better aesthetic
  • good mechanical properties
  • finishing properties of resin composites
  • fluoride release

Dental Materials (9 decks)

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