ASTRINGENTS

Astringents

Astringents cause contraction of tissues.They accomplish this by constricting small blood vessels,extracting water from tissue or precipitating protein.

Dentist can apply astringents to gingival tissues before taking impressions,placing ClassV or root surface restorations.They can alone be used  or in combination with retraction cords.

Aluminium Chloride::causes contraction or shrinking of tissues,making it useful in retracting gingival tissue.It also reduces secretions and minor hemorrhage.

Ferric Sulphate::is an effective and safe astringent and heamoststic for use in gingival retraction.

Aluminium sulphate::with other aluminium salts  is an effective and safe astringent and haemostatic for use in gingival retraction.

Aluminium Potassium sulphate::is not widely used, due to its limited properties.