Trios is working on getting this going. 3m and planscan too but those companies have always been C/B focused so its not likely going to go quicker until they rip off the trios people or get a ton of demand from their userbase.
challenge number 1 is managing the bite scan. if you need to separate the scanning into 2 appointments because the arches need their own scan for bases and rims, or if you want to avoid the rim stage altogether, this step is important. since tissue is squishy it makes life difficult trying to scan 2 fully edentulous arches in a bite. at least in its current iteration of software.
challenge number 2 is designing full dentures from edentulous scans. theres a degree of precision that is lost when you try to transfer from physical model with wax, to digital space. especially if theres no marked reference to papillas, frenulums, and other landmarks - that too makes it a bit difficult currently; those landmarks can easily be missed by the scan operator and going over them trying to acheive perfection in the scan might not always work. patients have flexibility limitations. setting up teeth in virtual space with no references and no opposing (because of earlier point 1 where the scans are separated) is far from precise and not an easily translated skill for the operator.
challenge number 3 is how you plan on optimizing this workflow for manufacturing - using premade teeth? fully 3dprinted final product? semi-finished 3d printed plate and add teeth manually? theres a lot of ways you can go with this.
challenge 4 is how repeatable this procedure is and will continue to be. as we know not every patient will be able to tolerate all of the denture materials. how to you cater to that with the rest of this in the air.