Hi... <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
First thing that struck me was why not an option (C);

Have the whole damn tooth extracted (still with full protection obviously).

Sounds like its going to be difficult and expensive to 'fix' regardless, and actually may not be fixable anyway. If its been damaged so much with the bruxism, repeat fillings etc then could there be deep fissures within, maybe absorbing mercury right now? I suppose it depends on the location/function but the loss of one tooth? nothing really in comparison. Of course there may need to be a revision of this 'cavitation' in the near future, but if this dentist is aware of such then ok, its another problem to address but... the mercury SOURCE will be out. Seriously i would consider this option over the next couple of days. Dont let mercury have the slightest chance to destroy your career prospects, as it did mine. One tooth is nothing...

Be and Stay Empowered! x