Clinical Aspects of GICs Flashcards
1
Q
what’re the 4 stages of GIC
A
dissolution
gelation
hardening
F release
2
Q
how is GIC made
A
water added to powdered glass & poly-acid
3
Q
what occurs in Stage 1 = dissolution
A
- water added to dry components
- H+ liberated from -COOH (on poly-acid chain)
- H+ free to move
- -COO- left on the poly-acid chain
H+ come into contact with glass particles
4
Q
what occurs in stage 2 = gelation
A
- Ca & Al ions attracted to -COO- on poly-acid chain
- poly-acid chains link together
5
Q
what occurs in stage 3 - hardening
A
- material hard to the touch
- still weak till fully set
6
Q
what is needed to remove smear layer
A
etch
7
Q
is a bonding agent needed for GICs
A
no
8
Q
what causes 50% of GICs to fail
A
secondary caries
9
Q
what are some clinical indications for GICS
A
- cavity below CEJ
- temporary fillings
- caries management
- peads
