glass ionomers Flashcards
1
Q
whats contained in glass ionomers?
A
fluoroaluminosillicate
2
Q
how do glass ionomers provide cariostatic properties?
A
fluoride release
3
Q
how do glass ionomers work?
A
Acid from liquid attacks glass, surface of glass reacts releasing contents e.g calcium, aluminium and fluoride ions. Cations cross link polyacid molecules giving salt matrix and unreacted cores.
4
Q
what are advantages of GI
A
Tooth coloured and translucent Easy to mix and manipulate Bond directly Fluoride Can be resin modified to increase strength
5
Q
what are disadvantages of GI
A
Wear resistance and compressive strength low
Poor aesthetics anteriorly
Finite working time
Can’t withstand occlusal forces
6
Q
what are the clinical indications for GI use
A
Abrasion/erosion cavities Deciduous teeth Composite not an option Base of tunnel preparation ART Root caries Luting cement
7
Q
properties of GI
A
brittle in thin sections, poor resistance, not set for 24hrs and sensitive to moisture.
