Drag marks on impressions

As opposed to bubble which are air inclusions, rag marks will appear as smooth, thin vertical lines in an impressions. Contrary to what I believed before, drag marks are unlikely due early removal of the impression material but more likely due to wet oral surfaces. the excess moisture is put under pressure from the seating impression and the path is is displaced through to escape the impression shows up as a drag mark. This is especially noticeable in hydrophobic impression materials such as PVS.

Setting times for intraoral impression materials are minimum suggested times for the warm oral environment. Add at least a minute on top of the setting time when using intraoral impression materials for your putty keys for temporary mockups and crowns.