[Dental] impression is a -ve imprint of hard and soft tissues in the mouth, from which a +ve reproduction (cast or model) can be formed
Process
Placing an impression material into a stock/custom dental impression tray, which is designed to roughly fit over the dental arches
The impression material is l iquid or semi-solid when 1st mixed and placed in the mouth, which then sets to become an elastic solid taking usually a few mins depending on the material, leaving an imprint of the Pt's dentition and surrounding structures in the oral cavity
Adhesive, e.g. Fix Adhesive which is solvent based adhesives which increase adhesion between alginate impression amterials and the impression tray surface
Block out wax, which can help block out undercuts prior to thermoforming
Materials
Non-rigid materials:
Irreversible hydrocolloid, including [Na] alginate, which is found in brown algae, refined from brown seaweeds, e.g. Blueprint Xcreme alginate
Elastomeric materials, including:
Silicones, including:
PVS (polyvinyl siloxane), which is a viscous liquid that cures/solidifies into a rubber-like solid, e.g. Extrude VPS, Kulzer Activator Universal Plus, Kulzer Flexitime VPS Impression Easy Putty
PIP paste, which is a pure white silicone paste, used to detect areas of pressure or uneven contact on the mucosa or natural teeth from the seating of crowns, bridges, and dentures
Polyethers, including:
Vinyl Polyether, e.g. GC Fit Checker Advanced that can be used to check pressure spots and fit accuracy of prosthetic works
Polysulfides
Rigid materials:
Zinc oxide and eugenol-based impression pastes
After care
Orange oil solvent, which is a lceaning solution which removes alginate or other impression materials or plasters from impression trays, hands, etc
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