Think about it you got master cast on scan. Print that out. Perfect verification jig and bite done in one appointment. Transfer jig to 3d master model. Bada bing bada boom lol. No one thinks that’s a good idea? Saving patient 2 appointments and a lot of impressions.
good idea sure. technology isn't at that level yet though.
mathematically it just doesnt work.
lets say you have trios. what is trios accuracy shot-to-shot ? assuming perfect scan conditions, no patient fog, no drool, no wet areas or bad scan.
calculate it out, its relatively simple. the camera in superspeed mode captures at 30 frames per second. assume you took 2000 frames for an arch, which is not atypical.
that falls within their 1-2minutes per arch rule.
30 frames per second when all of the frames fall within the same 3dimensional space is fine, however this is capturing an area the size of a nickel and then lining them all up. it is important to know the shot-to-shot accuracy in order to determine if the arch is going to be shaped too wide, or conversely too narrow. how wide/narrow it gets will depend if the accuracy is good or bad, and depend on the number of shots taken.
because no matter what your scanner is going to be off. no matter what.
2000 shots at 8um accuracy leaves you with an arch that can be wide or narrow by 16mm (2000 x 0.008 = 16)
2000 shots at 0.8um accuracy leaves you with an arch +/- 1.6mm
any bar with a tolerance of 1.6mm is a poorly made bar.
so take an impression and stop trying to make math magic.
Accuracy depends on how much overlap there is of all the scans together. Trios is case A. a fallible scan, based on the length and number of scans.
Case B is your box scanner. all of the data always overlaps, ensuring the deviation shot to shot is the same as the box scanner's internal photogrammetric ability to overlap scans.
