Capsule for mixing and dispensing a dental material

A capsule for mixing and dispensing a dental material comprising a powder component and a liquid component, the capsule comprising:

• a capsule body having a front end and a rear end;
• and
• a cavity extending from the rear end into the capsule body, the cavity having a decreasing cross-section approaching the front end thereby forming an outlet through the capsule body, the cavity adjacent the front end forming a mixing chamber adapted to contain the powder component and the cavity adjacent the rear end being closed by a liquid container,
• wherein the liquid container comprises:
• a cartridge forming a channel therethrough, the channel extending between a front opening and a rear opening of the cartridge and adapted to contain the liquid component;
• a front foil closing the front opening;
• and
• a rear foil closing the rear opening,
• wherein in a closed position the front foil is attached at an outside of the cartridge along a closed path circumferentially around the front opening, and
• wherein the front foil and the cartridge in at least a partial area of the closed path are separably sealed with each other, thus defining an openable valve through the closed path such that in an open position the openable valve provides a passageway through the partial area of the closed path for at least a portion of the liquid component to flow from the channel of the cartridge into the mixing chamber, the passageway extending between the front opening and an exterior of the cartridge;
• a piston slidably moveable in and sealingly fitting in the channel of the cartridge between the front opening and the rear opening and arranged such that the liquid component is enclosed in the channel of the cartridge between the front foil and the piston,
• wherein the liquid container includes at least one stopper arranged within the cartridge for limiting travel of the piston within the channel;
• and
• a plunger received within the rear opening of the capsule body and having a plug receivable within the rear opening of the cartridge, the plug having a cutting edge positioned toward the rear foil when the plug is received in an initial position within the rear end of the capsule body,
• such that when the plunger is moved from the initial position toward the front opening of the cartridge, the cutting edge of the plug punches through the rear foil of the cartridge and moves the piston toward the front opening of the cartridge to pressurize the liquid in the channel of the cartridge, the front foil separates from the at least partial area of the closed path to form the passageway and at least a portion of the liquid is transferred from the channel of the cartridge through the passageway and into the mixing chamber.