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Classification of impression materials

Impression materials

Any substance or combination of substances used to record an impression or negative reproduction those are called as impression materials.

Impression technique

A method and manner used in making a negative likeness.

Classification

1. Based on material use

A. Inelastic or rigid

  • Impression plaster
  • Zinc oxide eugenol
  • Compound wax

B. Elastic

    • Alginate
    • Polysulphide
    • Silicone
    • Polyether
    • Elastomers
  • Agar

2. Based on setting of materials

A. Chemical reaction

  • POP
  • ZnOE
  • Alginate
  • Silicone

B. Physical change

  • Agar-agar

3. Based on viscosity

A. Mucostatic

  • Impression plaster
  • Agar
  • Light body elastomer

B. Mucosuppressive

  • Impression compound
  • Alginate

C. Pseudo-plastic

  • Addition silicone

4. Based on interaction with water

A. Hydrophobic

  • Polysulphide
  • Addition silicone

B. Hydrophilic

  • Putty impression plaster

5. Based on use

A. Primary impression materials

  • Impression compound
  • Alginate

B. Secondary impression materials

  • ZnOE
  • Medium body elastomers

C. Duplicating materials

  • Agar

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