Patent ID: 7172338

Claim:
A stirring mixer for a dental impression material comprising: a tubular main body ( 1 ) in which a discharging portion ( 1 d ) having a small inner diameter and formed in a cylindrical shape is provided following to a kneading portion ( 1 c ) having a middle inner diameter and formed in a cylindrical shape via a throttling portion ( 1 b ) formed in a tapered circular truncated cone tubular shape from an injecting portion ( 1 a ) having a large inner diameter and formed in a cylindrical shape to which two kinds of pastes constituting the dental impression material are injected; and a stirring rod ( 3 ) which is provided with plural sets of stirring blades ( 2 ) on an approximately cylindrical outer surface ( 3 a ) in a protruding manner, and is rotated by a motor in a state of being attached within the tubular main body ( 1 ), wherein the stirring blades ( 2 ) protruded from the outer surface ( 3 a ) of said stirring rod are formed in a state in which the stirring blades are arranged at a predetermined interval on a line parallel to an axial direction of said stirring rod ( 3 ) and at a uniform interval in a circumferential direction of said stirring rod ( 3 ) sequentially from a side of the injecting portion ( 1 a ) of said tubular main body ( 1 ) and are constituted by first stirring blades ( 2 a ) in which leading ends are positioned in a largest diameter portion of said throttling portion ( 1 b ), second stirring blades ( 2 b ) third stirring blades ( 2 c ) and fourth stirring blades ( 2 d ), which are respectively positioned within the kneading portion ( 1 c ) of said tubular main body ( 1 ) and in which leading ends are positioned in an inner diameter portion of said kneading portion ( 1 c ), and wherein each of the first stirring blades ( 2 a ) is formed in a tapered curved shape with a back face side of said stirring rod ( 3 ) extending to a leading end in a rotational direction, an interval between the third stirring blade ( 2 c ) and the fourth stirring blade ( 2 d ) is set to be wider than an interval between the other adjacent stirring blades (between 2 a and 2 b and between 2 b and 2 c ), and opposing faces of the third stirring blade ( 2 c ) and the fourth stirring blade ( 2 d ) to each other bulge toward the other stirring blades ( 2 d , 2 c ).