| 主权项 |
1. A dental implant comprising:
a titanium member composed of a sintered body made from titanium or titanium alloy; and a ceramic member composed of oxide-based ceramic, and the ceramic member fixed to the titanium member, wherein the titanium member has a recess, and the ceramic member has a protrusion coupled to the recess and pores, and the titanium member covers the protrusion of the ceramic member, wherein the protrusion has a height in the range of 2 to 5 mm along its heightwise axis, wherein the protrusion has a cross-sectional area increasing portion whose cross-sectional area increases toward a dead-end portion of the recess in a direction away from a base end of the protrusion, and the cross-sectional area increasing portion has a circumferential surface, wherein an angle between the circumferential surface of the cross-sectional area increasing portion and the heightwise axis of the protrusion is in the range of 0.3 to 5°, wherein the titanium member is firmly fixed and joined to the ceramic member in a state that a part of the titanium or the titanium alloy is penetrated into the pores of the ceramic member, and wherein the ceramic member has a lower surface on which the protrusion is formed, and the titanium member has an upper surface in which the recess is formed and the upper surface is in contact with the lower surface when the protrusion of the ceramic member is coupled to the recess of the titanium member, wherein the lower surface is larger than the upper surface. |
