Fixture engagement structure, fixture and dental implant assembly

A fixture, in which the fixture is inserted into a jawbone of a patient and a fixture engagement structure of a dental implant assembly engages with the fixture, the fixture comprising:

• a first fixture alignment portion that is placed radially in an area portion engaging with the fixture engagement structure;
• and
• at least one second fixture alignment portion is placed radially in the area portion so as to be separate from the first fixture alignment portion and is arranged asymmetrically with respect to a center point located on a central axis of the fixture,
• wherein the second fixture alignment portion has a larger size than the first fixture alignment portion, along at least one of an inner circumference direction and a radial direction of the area portion,
• wherein the fixture comprises a multiplicity of fixture apical end portions such that the fixture apical end portions are formed to have a same level with respect to a longitudinal direction along the central axis, corresponding to respective structure apical end portions of the fixture engagement structure.

A dental implant assembly comprising a fixture inserted into a jawbone and a fixture engagement structure engaging with the fixture, wherein the fixture engagement structure comprises:

• a first engagement structure alignment portion that is placed radially in an engagement area portion engaging with the fixture;
• and
• at least one second engagement structure alignment portion that is placed radially in the engagement area portion so as to be separate from the first engagement structure alignment portion and is arranged asymmetrically with the first engagement structure alignment portion with respect to a center point located on a central axis of the fixture engagement structure,
• wherein the fixture comprises:
• a first fixture alignment portion that is radially placed so as to match the first engagement structure alignment portion in an area portion engaging with the fixture engagement structure;
• and
• at least one second fixture alignment portion that is radially placed so as to be separate from the first fixture alignment portion and is arranged asymmetrically with respect a center point located on a central axis of the fixture, in order to match the second engagement structure alignment portion in the area portion,
• wherein the second engagement structure alignment portion has a larger size than the first engagement structure alignment portion along at least one of an outer circumference direction and a radial direction of the engagement area portion,
• wherein the second fixture alignment portion has a larger size than the first fixture alignment portion along at least one of an inner circumference direction and a radial direction of the area portion, and
• wherein the fixture comprises a multiplicity of fixture apical end portions such that the fixture apical end portions are formed to have a same level with respect to a longitudinal direction along the central axis, corresponding to respective structure apical end portions of the fixture engagement structure.