Patent ID: 8398401
Filing Date: 2013-03-19
Classification: A61C

Abstract:
1. A dental implant including an abutment and a fixture to be coupled to the abutment and anchored to a jawbone, and the fixture having a female thread portion, wherein the abutment comprises a titanium member composed of a sintered body made from titanium or titanium alloy and having a recess and a male thread portion which makes thread coupling with the female thread portion of the fixture, and a ceramic member composed of oxide-based ceramic and having a protrusion fitted within 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 toward 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°, 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 recess and the protrusion, and wherein said engagement is obtained due to contraction of a non-sintered body of the titanium member through a sintering process.