ABOUT GLASS IONOMER CEMENT 
They are the tooth-coloured material based on its reaction
between silicate glass powder and polyacrylic acid. They bond chemically to the
tooth structure and release fluoride for a relatively long period. It is
introduced in 1972 by Wilson and kent.there are different types of gic
available like type 1(luting(,type 2(restoration),type 3(liner and base),type
4(fissureGabd sealant),type 5(orthodontic cement),type 6(core build up).They
all exhibit great physical properties like low –solubility,low-shear and
flexural strength, high compressive strength, coefficient of thermal expansion
is similar to dentin. Setting time is different for a different type like 4-5
for type 1,7 minute for type 2. They are highly recommended in dentistry due to
their tooth-coloured /esthetical approach which is available in various shades.
pulpal responses or biocompatibility to dentin is favourable.Gic is extremely
sensitive to air and water during setting so, immediately after placement into
the cavity, it needs preshaped matrix applied to it.it is used in anterior
esthetic restoration, for luting,core-build up, erode areas, atraumatic
restoration, orthodontic bracket adhesion etc. There are some advantages also
for all Gic that they exhibit higher opacity than resin,poor-wear resistance,
poor tensile strength, low fracture resistance, less esthetic than composite.
A more recent innovation re water settable Gic,metal
modified Gic, compomers , resin-modified Gic, which forms an even stronger bond
with dentin than traditional Gic do.
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