If you look at ISU1 (midline of upper incisor) planned movement you'll see relatively "neat" numbers -- 10.00mm advancement, 0.50mm left, 3.50mm up. This suggests that the surgeon "manually" planned/specified the movement of the upper incisor midline, and the other landmarks' numbers are generated (mostly) computationally.
Obviously 1/100th of a mm accuracy is not achievable. https://www.ncbi.nlm.nih.gov/pubmed/28950997 is one example of a study measuring accuracy in VSP cases.
Yes.
I'd say ~7.5mm of anterior movement at A point is a relatively large advancement (not a "slight" one). However, I would say it's good practice to ask for your surgical plan before your actual surgery.
Interesting report. Basically in a context where people discuss jaw movements with mm or even more accurate, the reality is that the result is 1mm+-1 (roughly), so it can be 2mm difference within one standard deviation.
You say 7.5mm is a rather large advancement, but is it really sensible to discuss surgery if the deviations are smaller, given the accuracy you can operate at? I mean, giving a surgery where the planned advancement is 2mm, and at worst case you end up at 4mm, so you're basically at same situation as before, just at the other end.
I've been looking at a lot if surgery movies, and there doesn't seem to be much magic going around in the surgery room. They use same tools as I have in my toolbox, saw, hammer etc and it doesn't exactly seem to be laser precision.