ALGINATE- Irreversible hydrocolloid- Content Is sodium or potassium salt of alginic acid –- Advantages¤ Economical/cheap¤ Single use, therefore no cross-infection¤ Sterilization done here- Laminate technique ie. alginate (tray) + agar (syringe)- Trisodium phosphate – setting reaction- Filler used is - Diatomaceous earth – for strengthALGINATE IMPRESSION TAKING:1. Right after alginate impression  wash under tap water  disinfect with 2% glutaraldehyde (1st choice) / cidex / iodoform – for 10 seconds2. Pour immediately – within 15mins3. If not distortion & poor cast due to synergesis4. When sending the impression directly to lab – store in 100% humidity – up to 45mins only5. Ie. Cotton dipped in water, drained & kept along with the impression in the plastic cover6. Do not put soaked cotton directly – will cause imbibition7. If alginate dries out – will affect the setting of dental stone also – due to absorption of water from cast by alginate – causes rough cast –8. Anticholinergic drugs are generally used to reduce saliva in patients with excess salivation

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