Impressions for cobalt chromes – avoiding air blows

Alginate is an excellent impression material for producing definitive casts for cobalt chromium frameworks.

To obtain the detail of the support teeth, avoiding air blows and allowing the framework to fit, I do the following:

1.     Dry the teeth thoroughly with the 3-in-1 air syringe

2.     Rub alginate into the occlusal surfaces with your finger

3.     Glaze the surface of the unset alginate in the impression tray with water

4.     Take the impression

5.     Use a timer to ensure you leave the impression in place for the correct length of time

Alginate is dimensionally stable for up to 5 days when kept moist and sealed in a plastic bag.

Denture Blog 41

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