Monday, 29 April 2019

GLASS IONOMER CEMENT - DENTALAAKA

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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