Some of the most compelling research on daily exposure to hg from Amalgam are the studies analyzing hg percentage in old fillings. I don't have the cites but some of the scientists that have studied this are Matt Hanson , Jaro Pleva ,Radics . Gilbert Jackson also studied this issue although his research has not been published in any scientific journal.Jackson and others found than one filling can vaporize 60 microgms/day.These studies were done by comparing percentages of hg ,copper,tin etc in new fillings vs fillings that are several years old and thus determining the daily loss of hg.