Bubbles, you wanted to know if anyone else had experienced anything similar, but the information you are providing is not clear at all. The hoof will be cut off, changes to the hoof will fall off, then you're "sure the 'real hoof' is still intact" and only the hoof wall will fall off.
While I realize it can be difficult to explain situations without pictures, I suggest that you put more effort into your terminology. I'm still not clear on how the hoof wall will fall off. All of it? All the way around? Or was a resection done? Or is there other damage perhaps related to the cause of the abscess that means a portion of the wall is no longer structurally attached and that piece will fall off?
I'm always interested in hoof stuff, but I get nothing from this thread so far. Perhaps you might get a chance to get pictures of the hoof? And I would also be interested in the cause of such a terrible abscess if known.