| 摘要 |
PROBLEM TO BE SOLVED: To provide an extruding structure of container of viscous material for dentistry that does not ooze the viscous dental material when extruding a desired amount of the dental material contained. SOLUTION: A viscous material for dentistry 4 that has been housed in a container body 1 having a nozzle 1a at the front tip, an opening at the rear end and a circular inner cross section with the same diameter D, is let moved toward the nozzle 1a by means of a plunger 2 or a piston of an extruder fit in the container body 1. A groove 2b to hold an O-ring 3, provided to follow a conical portion 2a at the nozzle 1a side of a moving cap with diameter smaller than the inner diameter D or the container body 1, is made to have a breadth between 1.5 and 2.5 times as large as diameter of the O-ring 3 in its no-load condition and a clearance between its bottom part 2c and inner face of the container body 1 being unchanged or getting narrower continuously or stepwise as leaving from the side of nozzle 1a.
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