Impression material
Impression materials are the products which are used to make an accurate replica or the mold of the hard and soft oral tissues.
=> Impression material are classified according to their composition, mechanism of setting, mechanical properties and applications.
Classification According to Setting Mechanism
1. Irreversible (Chemical reaction)
Examples includes : Alginate, Plaster of Paris, Silicones ( addition and condensation), Polysulfide, and Polyether.
2. Reversible (Thermally induced physical reaction).
Examples includes : Impression compound and Agar.
Classification according to Mechanical Properties
1. Rigid (inelastic) impression material.
Examples includes: Plaster of Paris, Zinc oxide-eugenol and Impression compound.
2. Elastic impression material.
Examples includes: Alginate, Silicones ( addition and condensation), Polysulfide, and Polyether.
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