rkm rdt
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A few factors come to mind. How much spray is applied to the abutment during the scanning of the abutment itself. Any anti rotation on the abutment? And cement gap.
I had the same issue until I completely dialed in my settings and design.
Here is a pic of what I try to put in all my custom abutments if the walls are thick enough and allow me to place it in the design. I made a custom attachment with a flat wall and 90 degree edge and on the other side is a flat wall and a 45 degree edge.
View attachment 22289 View attachment 22290
Then in 3Shape I have the margin gap @ 0.01 and the extra cement gap @ 0.025. Then on my VHF CAM I have the cavity set to -0.010mm All my Ti and Zr abutment crown have near zero wiggle. I also find the issue even with these setting to be the scan spray, quick check and Tinactin come on very thick as were my Scan spray from talladium is much thinner. You only need a slight layer to stop the anti glare so the camera and catch the data.
This is how I got rid of my wiggly crowns on abutments.
It might be a good idea to lightly sandblast the abutment prior to scanning.