Closed-Tray Impression
An implant impression technique in which a standard solid tray is used and the impression coping snaps off and remains in the patient's mouth when the tray is withdrawn, after which the coping is reattached to the implant analog.
Full Definition
In the closed-tray (indirect) impression technique, a non-perforated impression tray is loaded with material and seated over snap-on or transfer impression copings. When the tray is removed, the copings disengage from the implants and remain intraorally; they are then retrieved, reattached to implant analogs, and repositioned into the impression. This method is generally faster and simpler than the open-tray technique and is indicated for parallel implants with favourable access. However, it carries a slightly higher risk of dimensional inaccuracy in cases involving multiple or divergent implants. Editors reviewing prosthetic documentation should ensure that 'closed-tray' and 'open-tray' are not used interchangeably.
Usage
Usage note: Always hyphenate 'closed-tray' as a compound modifier. Do not abbreviate in clinical documents. Verify that the impression coping type described in accompanying prescriptions is consistent with the stated technique.
In Context
- "The closed-tray impression was selected for the single-unit posterior implant due to straightforward access and parallel implant orientation." — Prosthetic clinical notes
- "The draft protocol described a closed-tray approach but referenced a pick-up coping, which is incompatible; the editor flagged the inconsistency." — Clinical protocol review