Mercury waste is also produced during the removal of old amalgam fillings.
The weekly average number of removed amalgam fillings per clinic in this study was reported to be 3.5. Considering that each removed filling can release 2 units of mercury, the associated weekly amount of mercury release is estimated at 3.85 g/clinic.
The total weekly release of mercury from amalgam waste is there-fore estimated at 13.42 g/clinic (Table 2).