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Do NOT use the Double Cord Technique in the Traditional Manner for Digital Impressions

There is a concept in digital dentistry that is called “mixing good and bad data”.  What you have to appreciate is that two different objects can’t occupy the same space in the same 3D model.  The clinical example of this is when you pack 2 cords, image the margins, then remove the top cord and image the preparation some more.

This introduces a lot of errors and distortion at the margins. You either have to image with 2 cords retracting the tissue at once or take top cord out and the image the only remaining cord.  This is a habit that has carried over from analog that most users can’t seem to get past and often get frustrated with the results. See the video for a detailed explanation


margin visualization