Impression Procedure

Impression

FOR RECORDING A GOOD Impression!!

Pre-impression scaling.

Silicone based impression materials preferably Addition Silicones.

Take impression with heavy body putty followed by drying.

Take a wash impression with light body material.

Scaling before taking impressions removes plaque - better impressions and reduces the amount of residual spacing at the end of treatment.

Silicone-based impression material, including PVS, VPS, and polyether material is preferred Alginate is not acceptable because it dries out and the material itself can shrink or expands.

Select the correct tray size.

Use heavy body and light body material.

Mix the Heavy body materials according to the instruction.

Apply the space maintainer foil (cling film available for food is good), then shorten it distally with a pair of scissors to tray size.

Dry the teeth with the air syringe to eliminate saliva bubbles.

Check the cut impression for floating parts before air - drying it.

Fit the mixing gun for the light bodied material and fill in the tray with correction material.

Follow manufacturer's instruction for working and setting time.

All teeth should be clearly impressed without any air bubbles.
No voids, bubbles, thin walls, shifts, double imprints, drags, pulls or tears.
Distal surface of the last molar should be properly recorded.
Make sure you have detailed, accurate occlusal surfaces.
Not only the teeth but also the gingival margins is reliably precisely impressed (3-4mm beyond margin) – it helps in defining the long axis of the tooth.
Make sure that the impression material is intact, not damaged or thin.
In case of doubt double check by pouring a model in stone / plaster for the quality of impression.