INDIRECT FIXTURE LEVEL IMPRESSION (closed tray)

Transfer coping

This technique is probably one of the easiest ways to record the implant position in relation to the surrounding teeth and tissue. As a general rule it is best to always take full arch impressions with a polyvinylsiloxane (AFFINIS®PRECIOUS by coltene®, Aquasil Ultra by Dentsply)  impression material because this will result in the greatest accuracy and ensures the laboratory can develop proper implant protected occlusion and avoid lateral contacts for the implant restoration. Use appropriate platform diameter, indirect impression coping (also called transfer coping) from the same manufacturer as the implant. Using the correct impression coping will give the technician important information about the manufacturer and platform diameter to avoid any confusion on what parts to use.

Transfer seated

With the patient in the chair and the transfer coping on hand remove the trans mucosal healing abutment with a hand screw driver. Immediately following the removal of the healing abutment place the impression coping on to the implant, engaging the indexing feature of the implant.

Confirmed seat

Sometimes the implant will be quite far below the tissue and once the healing abutment is removed the tissue will start to collapse over the implant, making the seating of the transfer difficult. Therefore, working efficiently and expediently is essential. Once the impression coping is seated and the retaining screw is hand tightened take an x-ray to verify accurate placement of the transfer on to the implant. The x-ray needs to be taken perpendicular to the long axis of the implant to ensure a clear picture of the mating surface of the implant and impression coping.

Closed tray

Load full arch impression tray and take impression (no retraction cord needed). Remove the impression tray after the impression material has set. Unscrew the transfer and place the healing abutment back on to the implant and hand tighten. Full arch impression of the opposing and a bite record also are needed. Impression taking trouble shooting guide.

Send impressions, bite, transfer coping and a copy of the x-ray to the laboratory. Sending a copy of the x-ray to the lab serves as proof the impression coping was seated accurately at the time of impression taking. This might come in handy later on, if there are problems with the restoration supplied by the laboratory and a decision needs to be made where the mistake occurred.