No, they cannot. This has been confirmed by the European Commission’s Scientific Committee for Emerging and Newly Identified Health Risks (SCENIHR), which stated in their guidelines that there is no evidence of a connection between amalgam fillings and changes in fertility in both women and men.
In support of their stance they cite one study in particular: “We believe that properly made amalgam fillings do not pose a health risk and their replacement is unnecessary, however all new fillings we create are entirely amalgam-free and not live in any way.”