Hello Riley!
Yes, scan spray can definitely help with the gingiva tissue scans. I've played around with a few, and found (hopefully) the better ones. Helling scan spray (3dscanspray.com) leaves an average 2micron layer and comes in large 400ml cans. Sprays on clear, and dries white. Also seen someone start using the snowrock scan powder. From what I've seen, it does a great job, and lasts a long while.
As a heads up, I've used scannable gingiva material as well, so that is a possibility, but at the time, the viscosity made it difficult to handle, and the drying time was longer than normal soft tissue.
With Medit in particular, pay attention in the preview windows of the ColLab2017 software and make sure the camera can see exactly what the main window is looking at (it's occasionally off from what I call the Master view). Double click the main window to have the scanner turn to look at that spot, and you can click one of the two camera previews on a spot that's difficult to see, and it will auto set the exposure rate for the best scan. Also try manually moving the slider. Good general rule of thumb, reflective surfaces, turn down the exposure %, dark areas (pits or interproximals) turn it up ^^^^^
If all else fails in scanning, use the close hole feature after merging in ColLab, or use the edit mesh in the expert mode of Exocad and highlight the area around which you want the close holes to work, and click close holes. (This can close even the bottom of a model). If the close hole doesn't look quite right to the existing contours, you can right click the object again and freeform scan data to freeform it, just like a restoration, how you believe the contour should be.
Hope this helps!
- Josh