Patent ID: 8408905

Claim:
A dental implant including an abutment, wherein the abutment comprises a titanium member composed of a sintered body made from titanium or titanium alloy, and a ceramic member composed of a sintered body made from oxide-based ceramic; wherein the ceramic member has a recess and the titanium member has a protrusion inserted into the recess, wherein the protrusion has a heightwise axis and a cross-sectional area increasing portion whose cross-sectional area continuously increases from a base end of the protrusion to a dead-end portion of the recess, and the cross-sectional area increasing portion has a surface, wherein an angle between the surface of the cross-sectional area increasing portion and the heightwise axis of the protrusion is in a range of 0.3 to 5°, and wherein a cross-sectional shape of the protrusion is an elliptical shape, wherein the titanium member and the ceramic member are firmly fixed and joined together through an engagement between the protrusion and the recess, wherein said engagement is obtained due to the ceramic member with the recess contracting greater than the titanium member with the protrusion through a degreasing and sintering process, and wherein the protrusion conforms in shape to the recess.