A<unk>  <unk>  is one of a class of materials commonly used in dentistry as filling materials and luting<unk> s. These materials are based on the reaction of silicate glass powder and polyalkeonic acid.  These tooth-coloured materials were introduced in 1972 for use as restorative materials for anterior teeth (particularly for eroded areas, Class III and V cavities).
As they bond chemically to dental hard tissues and release fluoride for a relatively long period modern day applications of<unk> s have expanded. The desirable properties of<unk> s make them useful materials in the restoration of carious lesions in low-stress areas such as smooth-surface and small anterior proximal cavities in primary teeth. Results from clinical studies, do not support the use of conventional or metal-reinforced glass<unk>  restorations in primary molars.
Glass ionomer cement
Acrylic glass
Pyritinol
Activated carbon
Dimethylcarbate
Tetrachloroethylene
Methylcellulose
Polydimethylsiloxane