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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
2. Based on setting of materials
A. Chemical reaction
- POP
- ZnOE
- Alginate
- Silicone
B. Physical change
3. Based on viscosity
A. Mucostatic
- Impression plaster
- Agar
- Light body elastomer
B. Mucosuppressive
- Impression compound
- Alginate
C. Pseudo-plastic
4. Based on interaction with water
A. Hydrophobic
- Polysulphide
- Addition silicone
B. Hydrophilic
5. Based on use
A. Primary impression materials
- Impression compound
- Alginate
B. Secondary impression materials
- ZnOE
- Medium body elastomers
C. Duplicating materials
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