Patent ID: 8807394

Claim:
A system comprising: an automatic mixing and dispensing device for a dental substance, and a material container; the automatic mixing and dispensing device comprising: a reservoir for receiving the dental substance and the material container; a first pressure plate and a second pressure plate which are movable through the reservoir parallel to a dispensing axis; the first pressure plate adjacent a free end having a first pressure plate surface located laterally to the dispensing axis, the first pressure plate surface having a first pressure plate area, and the second pressure plate adjacent a free end having a second pressure plate surface located laterally to the dispensing axis, the second pressure plate surface having a second pressure plate area; a first plunger and a second plunger which are movable generally parallel to the dispensing axis for extruding material from the material container in the reservoir; the material container having a first and a second material chamber for containing components of a material, the first and second material chambers having a first and a second chamber cross-section, respectively, each extending generally uniformly over a chamber length, the first and second chamber cross-sections having a first and second chamber area; and wherein the first plunger has a free first front end oriented toward the material container, and the second plunger has a free second front end oriented toward the material container; and wherein the first plunger adjacent the first front end has a first plunger front surface laterally to the dispensing axis, and the first plunger front surface has a first plunger front area which corresponds to the first chamber area; and wherein the second plunger adjacent the second front end has a second plunger front surface laterally to the dispensing axis, and the second plunger front surface has a second plunger front area which corresponds to the second chamber area; wherein at least one of the first and second chamber areas is smaller than the smallest of the first and second pressure plate areas; and wherein the first and second plungers are insertable within the first and second material chambers to extrude material therefrom.