IMPRESSION MATERIALS GYPSUM MATERIALS

TYPE I – IMPRESION PLASTER
- To take impression not to pour cast
- Mucostatic type impression technique

TYPE II – DENTAL / MODELING PLASTER
- For flasking procedure
- Orthodontic diagnostic casts

TYPE III – DENTAL STONE
- For making diagnostic cast
- Also called Yellow Stone / Micro stone

TYPE IV – DIE STONE--Low Expansion
- High strength
- Least setting expansion
- For pouring cast, base, for crowns bridges & implants, etc.
- Also called Densite

TYPE V – DIE STONE – High Expansion
- High strength
- High setting expansion
- For dies for crown & bridge
- Also called DieKeen

NB :
Accelorator:
- Sulphate
- Least amount of sodium chloride
Retarder
- A-Acetate, B-Borate, C-Citrate
- Higher amount of sodium chloride