A storage and mixing system for pasty two-component polymethyl methacrylate bone cements, the storage and mixing system comprising: a tubular cartridge having a cylindrical inner chamber; a cartridge head, which closes one end of the tubular cartridge on the front side; a partition disposed axially in the cylindrical inner chamber of the cartridge, wherein the partition divides the cylindrical inner chamber of the cartridge bounded by the cartridge head into two cavities (3, 4) that are spatially separated from one another, wherein a first pasty cement component is present in the first cavity and a second pasty cement component is present in the separate second cavity; two dispensing plungers (5, 6) disposed axially displaceably in the two cavities (3, 4) of the cartridge, wherein the dispensing plungers (5, 6) close the two cavities (3, 4) on the back side of the cavities (3, 4) situated opposite the cartridge head; a bending device for deforming the partition, wherein the bending device is axially movable in the cartridge and is disposed or to be disposed behind the dispensing plungers (5, 6), as seen from the cartridge head, wherein the bending device comprises a deflection surface that is inclined with respect to the axis of the cartridge and that presses the partition laterally in the direction of the inside wall of the cartridge when the bending device is pushed into the cartridge, wherein the partition is connected to the inside wall of the cartridge via a predetermined breaking point, or the partition is detachably connected to the inside wall of the cartridge, so that the partition detaches from the inside wall of the cartridge when the partition is being deformed by the movement of the bending device into the cartridge, wherein a rear end of the partition, which is disposed behind the dispensing plungers (5, 6), as seen from the cartridge head, is fixable or is fastened to the cartridge so that the rear end of the partition does not detach from the cartridge when the bending device moves into the cartridge. a tubular cartridge having a cylindrical inner chamber; a cartridge head, which closes one end of the tubular cartridge on the front side; a partition disposed axially in the cylindrical inner chamber of the cartridge, wherein the partition divides the cylindrical inner chamber of the cartridge bounded by the cartridge head into two cavities (3, 4) that are spatially separated from one another, wherein a first pasty cement component is present in the first cavity and a second pasty cement component is present in the separate second cavity; two dispensing plungers (5, 6) disposed axially displaceably in the two cavities (3, 4) of the cartridge, wherein the dispensing plungers (5, 6) close the two cavities (3, 4) on the back side of the cavities (3, 4) situated opposite the cartridge head; a bending device for deforming the partition, wherein the bending device is axially movable in the cartridge and is disposed or to be disposed behind the dispensing plungers (5, 6), as seen from the cartridge head, wherein the bending device comprises a deflection surface that is inclined with respect to the axis of the cartridge and that presses the partition laterally in the direction of the inside wall of the cartridge when the bending device is pushed into the cartridge, wherein the partition is connected to the inside wall of the cartridge via a predetermined breaking point, or the partition is detachably connected to the inside wall of the cartridge, so that the partition detaches from the inside wall of the cartridge when the partition is being deformed by the movement of the bending device into the cartridge, wherein a rear end of the partition, which is disposed behind the dispensing plungers (5, 6), as seen from the cartridge head, is fixable or is fastened to the cartridge so that the rear end of the partition does not detach from the cartridge when the bending device moves into the cartridge.