| 摘要 |
PURPOSE: To allow an injector to be relieved of the load of material packed in a cartridge, at the end of feed of the material, to obtain a good material density in the outward direction of a stopper along the overall length of the cartridge by forming a part or more of the disk-shaped portion of the stopper as a membrane surface made from a synthetic resin. CONSTITUTION: When a rotating piston 4 is rotated by a handle 5, a stopper 6 advances, and a dental working material packed in a cartridge is fed out from the outlet 23 of an outlet nozzle 9. Next, when the rotating piston 4 is rotated in the opposite direction, the pressure of a membrane surface 10 is eliminated, and the membrane surface 10 returns to its original stage. Then, as the membrane surface 10 returns to its original state, back pressure is produced in the cartridge, and the dental working material located at the outlet 23 of the nozzle 9 is drawn back into the cartridge. Therefore, an injector is relieved of the load of the material at the end of feed of the material, and a good material density can be obtained in the outward direction of the stopper along the overall length of the cartridge. |
