gics

Question 1

What are the properties?

Answer 1

Durable (compressive strength)- >150MPa
Insoluble 
Adhesive
Set without exothermic and no shrinkage
Fluoride releasing
Radiopaque 
Poor aesthetic
Relatively brittle 
Susceptible to wear

Question 2

What is the composition?

Answer 2

Basic fluoroaluminosilicate glass
Polymeric acid
Tartaric acid
Water

Acid base reaction
Metal cations for salt bridges w ionised carboxylic acid groups on high molecular weight poly acids

Question 3

How is GIC presented?

Answer 3

Powder-liquid

Capsule

Question 4

What are the phases of GIC?

Answer 4

Dissolution- acidic attack of glass surface

Gelation- early cross linking by Ca2+

Hardening- substitution of Ca2+ by Al3+

End result- composite biomaterial of acid degraded glass particles set in a cross linked hydrogel matrix

Question 5

What factors influence biocompatibility?

Answer 5

Bulk composition
Surface chemistry
Ion release

Question 6

What are clinical uses?

Answer 6

Primary teeth restorations
Class V restorations in permanent 
Erosion/abrasion lesions
As fissure sealant
Atraumatic restorative treatment
Luring cements

High caries- favoured for fluoride
Cavity bases

Question 7

What are the contraindications?

Answer 7

Highly loaded sites

Where aesthetics are a important

Question 8

Does fluoride protect teeth?

Answer 8

Substantial evidence- yes against caries at right conc

Antibacterial properties?- no data that this is important

Affects on tooth mineral?- lots of data to suggest, SOME DISAGREEMENT