WOW! I'd not even thought it could be that! I actually have quite a lot of Amalgam fillings! Most from when I was younger and I recently had a few more plus some of the older ones replaced due to wear and tear according to my dentist. All are amalgam! :0
I'm in the UK, where is this dentist you mentioned based? Is it in the US? I'll check that link out and bookmark it and do as much research as possible! I'll try to get hold of that book too!