Abstract
One of the most frequently encountered problems in making dual-arch impressions is placing the tray in an improper position, where it impinges on an anatomical structure and is distorted. This kind of distortion may affect the accuracy of the final impression and often can be recognized when the side wall of the tray shows through the impression material. This usually indicates that the side wall of the tray has been deflected by an anatomical structure that has pressed against the side of the tray, thereby displacing the impression material. Impressions like these should be rejected.
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