gibby, you MAY have the greatest dentist in the whole wide world, but in my estimation there appears to be a lot of miscommunication between you and your dentist.
OTOH, it is true that IF in the unlikely event your root canal
treatment turned into an apioectomy, then the latter would have been done with amalgam.
OTOH, typical root canals
do not need apioectomies and Amalgam
IF 'I' was trying to figure out whether my dentist was telling the truth -- that is if my root canals
were filled or not filled with Amalgam
-- I would ask for and actually VIEW my own set of X-rays. By viewing X-rays it is EASY to tell if the patient has had any root canals with apioectomies.
I see no reason why you should question him/her too much. Simply ask for and actually VIEW your own set of X-rays. By viewing your X-rays it will be EASY to tell if you have had any root canals with apioectomies.
The lack of apioectomies mean there is no amalgam in or about your root canals.