IMPRESSION MATERIALS GYPSUM MATERIALSTYPE I – IMPRESION PLASTER- To take impression not to pour cast- Mucostatic type impression techniqueTYPE II – DENTAL / MODELING PLASTER- For flasking procedure- Orthodontic diagnostic castsTYPE III – DENTAL STONE- For making diagnostic cast- Also called Yellow Stone / Micro stoneTYPE IV – DIE STONE--Low Expansion- High strength- Least setting expansion- For pouring cast, base, for crowns bridges & implants, etc.- Also called DensiteTYPE V – DIE STONE – High Expansion- High strength- High setting expansion- For dies for crown & bridge- Also called DieKeenNB :Accelorator:- Sulphate- Least amount of sodium chlorideRetarder- A-Acetate, B-Borate, C-Citrate- Higher amount of sodium chloride

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