PURPOSE: To facilitate production by forming the artificial tooth root by using a powder sintered body of a shape memory alloy of a Ti-Ni alloy system.

CONSTITUTION: Ti powder and Ni powder are mixed and the mixture is made into, for example, a pellet form by molding; thereafter, the moldings are subjected to a heating treatment in a vacuum or inert gaseous atmosphere at ≤900°C temp., by which the Ti-Ni alloy is formed. The sintered molding consisting of the resulted Ti-Ni alloy is pulverized to form Ti-Ni alloy powder. A binder is added to the Ti-Ni alloy powder and after the mixture is kneaded, the kneaded mixture is molded to a shape approximately equal to the shape of the desired tooth root by press forming, casting, injection molding, etc. The resulted molding is degreased at about 500°C after machining or without machining and is then sintered in a vacuum or an inert gaseous atmosphere of gaseous argon, gaseous helium or gaseous nitrogen for about one hour at about 950 to 1250°C. The easy molding to the precise shape is possible in this way.