| 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. |
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