Hi Mati, it is hard to spot cavitations, though sometimes they can be seen faintly on panoramic xrays (vague ghostley lines).

The typical areas are the wisdom teeth because they are often the worst to pull out and leave such a hole behind and their position too.

Your tooth with the big amalgam, would probably then be better to get removed. To avoid a cavitation, simply ask the dentist/oral surgeon to remove the periodontal ligament, and as you know, request the right anaesthetic without the unnecessary undesirables. He should have NO problems doing that for you.

A dentist here that I saw recently (just general, not even biologic), was very good and listened to me and I remember filling out a form before I saw him and I'm sure it mentioned reactions to anaesthetic, so I simply put bad reactions to the vaso constrictors, epinephrine and said the ill effects would go on long term.

I knew he listened because when he gave me the anaesthetic, instead of having the usual horrible heart palpitations, I had the typical tiredness, which was preferable.

You should be ok. Just eat healthy to prepare your body for this, so that it can better heal after it (bone etc).