Patent ID: 8398402

Claim:
A dental implant including an abutment, wherein the abutment comprises a ceramic member composed of a sintered body made from oxide-based ceramic, and having a recess, and a titanium member composed of titanium or titanium alloy, and having a protrusion fitted to 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 of the ceramic member, 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 contraction of a non-sintered body of the ceramic member through a sintering process.