Class III space opening

 

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I am sorry to see that the treatment is not going well, Of course you had the problem of the TAD failure
If I may say, I think the TADs have been placed too close to the crown. The cortical bone thickness is usually the lowest at marginal bone. 
The normal placement would be at the junction between the gingiva and the mucosa, in your case I think 2 or 3mm more apical. 
I don't know if you want to replace the TADs, otherwise we might consider an IZ tad or completely change the plan.
Less important detail, the cantilever looping should have been the opposite
 
 

I have been thinking to this case, and I think we should consider the use of infrazygomatic TADS or Palatal, in case we can't work with interradicular ones.
Rositza, can you check your cbct?