It is essential to take a verification radiograph prior to taking the impression to ensure full seating of the impression coping within the implant.
Below is an example of what a fully seated impression coping would look like with a tissue level implant and with a bone level implant.
For multiple unit cases it is always wise to consider splinting the impression copings to each other prior to taking the impression. This will help produce a passively fitting superstructure without distortion by reducing discrepancies in the impression setting stage. It will also reduce distortion of the bridge by reducing the risk of impression coping movement when the analogues are attached in the laboratory. See photos below.
You should always be prepared to customise the impression coping even in a single unit case. This can be to ensure enough contact areas between the impression coping and impression material. This is particularly important when the fixture head is placed greater than 3mm sub-gingivally, or in immediate placement cases following extraction.
Customisation of the impression coping by duplicating the emergence profile of a provisional restoration is the best way to ensure a successful outcome in the aesthetic zone.
All Straumann compatible implants, both tissue level and bone level, have screw-retained fixture mounts. These enable completely passive removal of the fixture mount from the implant in cases of poorer quality bone or in grafting cases where primary stability may not be ideal.