Mercury and silver alloy still used by some dentists to fill cavities (7)

I believe the answer is:

amalgam

(Other definitions for amalgam that I've seen before include "Mixture - alloy of mercury" , "Mixture (for dental fillings)" , "Mercury alloy - combination" , "Blend or combination" , "Alloy of mercury and another metal" .)

I've seen this clue in The Guardian.

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