In ICOI’s official glossary, Indirect impression is cross-referenced to Closed-tray impression.
Closed-tray impression: Syn: Indirect impression.Impression technique that uses an impression coping with positioning features, around which a rigid elastic impression material is injected.
After removal of the impression, the coping is unthreaded from the mouth, connected to a laboratory analog and repositioned into the impression prior to pouring.
See: Open-tray impression.
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