Glass Polyalkenoates

Question 1

Where are glass polyalkenoates derived from?

Answer 1

silicate and polycarboxylate cements

Question 2

What are glass polyalkenoates used for?

Answer 2

Crowns and severely broken down teeth

Question 3

What are the old contents of glass polyalkenoate cements?

Answer 3

zinc oxide powder
polyacrylic acid liquid

Question 4

What is zinc oxide replaced with in the new formula?

Answer 4

glass polyalkenoate (glass ionomer)

Question 5

What 3 forms do glass ionomer cements come in?

Answer 5

1. powder and liquid
2. powder and water
3. encapsulated

Question 6

What is a glass ionomer cement?

Answer 6

silicate glass and water soluble acidic polymer

Question 7

When are glass ionomer cements used?

Answer 7

paediatric restorations

Question 8

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

Answer 8

fluoride release

Question 9

What is the setting reaction for glass ionomer cements?

Answer 9

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

Question 10

What makes glass ionomer cements tooth coloured?

Answer 10

unreacted glass cores reflect the colour of tooth and transmit light

Question 11

What releases fluoride in glass ionomer cements?

Answer 11

glass

Question 12

What time is the initial set of glass ionomer cements?

Answer 12

3 minutes

Question 13

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

Answer 13

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

Question 14

What time is the final set of glass ionomer cements?

Answer 14

24 hours

Question 15

What particle predominates the final set of glass ionomer cements?

Answer 15

Al3+

Question 16

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

Answer 16

moisture

Question 17

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

Answer 17

varnish or unfilled resin
- Vaseline as a lubricant when polishing

Question 18

How can you reform a glass ionomer cement?

Answer 18

mix with water or dilute solution of the acid

Question 19

What may increase the adhesion of glass ionomer cements?

Answer 19

tooth cleanser - citric acid

Question 20

What makes a resin modified glass ionomer cement?

Answer 20

small addition of light-curing resin

Question 21

What are the advantages of using RMGIC’s?

Answer 21

• varnish not required
• work faster
• expand in water

Question 22

What is the advantage of RMGICs expanding in water?

Answer 22

helps seal cavity

Question 23

How are RMGICs set?

Answer 23

light cure

Question 24

What is HEMA?

Answer 24

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

Question 25

How should RMGICs be applied?

Answer 25

rapidly in small increments

Question 26

What is a giomer?

Answer 26

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

Question 27

What are the 2 giomer reaction types?

Answer 27

1. surface reaction 2. full reaction

Question 28

What condition allows giomers to have greater fluoride release?

Answer 28

low pH

Question 29

What are advantages of giomers?

Answer 29

- better aesthetic - good mechanical properties - finishing properties of resin composites - fluoride release