Abstract: A dental amalgam mixing capsule including an inner capsule housed in an outer capsule. The inner capsule includes an elongated pestle telescopically extended into an open ended cap including a resilient, annular skirt formed with an annular sealing lip sized for frictional, gripping engagement with the pestle to define a storage chamber therebetween for storing a liquid component of the amalgam. The inner capsule may be made by subjecting the cap to a partial vacuum, inserting a charge of such liquid component therein, and registering one end of such pestle in sealing engagement with such sealing lip. Thus, when the assembly is returned to atmospheric pressure, the partial vacuum trapped in the cap will provide for a pressure differential across the pestle drawing it into the cap to fill the space therein.

Abstract: A compartmentalized dental amalgam mixing capsule including an upstanding elongated receptacle having a cylindrical interior chamber for receipt of an alloy therein. The receptacle is formed with an annular flange in the upper portion of the chamber including a central opening and formed with at least one lock pin projecting laterally outwardly from the receptacle. A rupturable pillow containing mercury therein is configured to overlie the flange. An elongated cylindrical cap formed with a closed top end, an open bottom end, and includes a piston device carried from the top end projecting axially downwardly therefrom to terminate in a hammer end configured to overlie the pillow. The cap is further formed with an elongated groove slidably receiving the lock pin and angling axially upwardly in one circumferential direction.