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1. (WO1998048728) IMPLANT SYSTEM
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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Claims:

1. A dental implant system comprising:- a fixture (301; 401; 501) for implantation in bone tissue (312, 314; 512, 514) of the maxilla or mandible by displacement thereof in a forward direction, the fixture having:- a forward end,
a rearward end (330; 430; 530), and
an outer surface (305; 405; 505) which extends between the forward and rearward ends and which forwardly of a predetermined position (307; 407; 507) on the outer surface is adapted for interlocking with bone tissue of the maxilla or mandible; and
a superstructure (402) for mounting on the fixture, the superstructure having:- a forward end for interfacing with the rearward end of the fixture, the forward end of the superstructure and the rearward end of the fixture presenting interfacing surfaces for interfacing with one another;
characterised in that the rearward end of the fixture and the forward end of the superstructure are so constructed and dimensioned that a predetermined interfacing surface of the superstructure (423) is able to interface in the forward direction with a
predetermined interfacing surface of the fixture (31 1 ; 409; 525) which is at a level which is disposed forwardly of the predetermined position on the outer surface.

2. A system according to claim 1, characterised in that the predetermined interfacing surfaces of the fixture and the superstructure are the only interfacing surfaces of the fixture and superstructure which are adapted to interface in the forward direction with one another.

3. A system according to claim 1 , characterised in that the predetermined interfacing surfaces of the fixture and superstructure are predetermined forward interfacing surfaces and that the forward end of the superstructure and the rearward end of the fixture are so constructed and dimensioned that the forward end of the superstructure presents a predetermined rearward interfacing surface for interfacing in the forward direction with a predetermined rearward interfacing surface presented by the rearward end of the fixture at a level disposed at, or rearwardly of, the predetermined position on the fixture outer surface.

4. A system according to claim 1, 2 or 3, characterised in that the predetermined interfacing surfaces of the fixture and superstructure are adapted in use to interface at a level which is in the range of 1 mm up to approximately 10 mm forward of the
predetermined position on the fixture outer surface.

5. A system according to claim 1, 2 or 3, characterised in that the predetermined interfacing surfaces of the fixture and superstructure are adapted in use to interface at a level which is approximately 0.1-1 mm forward of the predetermined position on the fixture outer surface.

6. A system according to any one of claims 1 to 5, characterised in that afemale recess (308; 408; 508) is provided in the rearward end of the fixture having a boundary wall (311 ; 41 1, 413; 525) which extends from an opening in the rearward end to a level forwardly of the predetermined position on the fixture outer surface, that the predetermined interfacing surface of the fixture is a predetermined surface of the boundary wall of the female recess (31 1; 409; 525) which is disposed forwardly of the predetermined position on the fixture outer surface and that the predetermined interfacing surface of the superstructure (423) is a predetermined surface of a boundary wall of a male projection (415, 417) provided at the forward end of the superstructure.

7. A system according to claim 6 when appendant to claim 3, characterised in that the predetermined surfaces of the boundary walls of the female recess and male projection are presented by predetermined forward sections of the respective boundary walls, that the predetermined rearward interfacing surface of the fixture is presented by a predetermined rearward section of the boundary wall of the female recess disposed at, or rearwardly of, the predetermined position on the fixture outer surface and that the predetermined rearward interfacing surface of the superstructure is presented by a predetermined rearward section of the boundary wall of the male projection.

8. A system according to claim 7, characterised in that the extent of the
predetermined forward section of the boundary wall of the female recess in the forward direction is greater than the extent of the predetermined rearward section of the boundary wall of the female recess in the forward direction.

9. A system according to claim 7 or 8, characterised in that the predetermined forward and rearward sections of the boundary walls of the female recess and male projection are contiguous.

10. A system according to any one of claims 6 to 9, characterised in that the predetermined surfaces of the boundary walls of the female recess and male projection have a generally conical profile with flank surfaces which converge in the forward direction at a common angle or substantially common angle.

11. A system according to claim 10 when appendant to claim 7, 8 or 9, characterised in that the predetermined rearward sections of the boundary walls of the female recess and male projection have a generally conical profile with flank surfaces which converge in the forward direction at the common angle or substantially the common angle.

12. A system according to claim 6 when appendant to claim 2, characterised in that the predetermined surfaces of the boundary walls of the male projection and female recess are presented by predetermined forward sections of the respective boundary walls having a generally conical profile with flank surfaces which converge in the forward direction at a common angle or substantially common angle and that the boundary walls of the male projection and female recess each have rearward sections (421, 41 1) which extend rearwardly from the predetermined forward section and which are so constructed and dimensioned that they are spaced apart when the predetermined forward sections interface.

13. A system according to claim 12, characterised in that the rearward section of the boundary wall of the female recess is of a conical profile with flank surfaces which converge in the forward direction.

14. A system according to claim 13, characterised in that the flank surfaces of the rearward section of the boundary wall of the female recess converge in the forward direction at the common angle.

15. A system according to claim 13 or 14, characterised in that the rearward section of the male projection is of a conical profile with flank surfaces which converge in the forward direction at an angle which is more acute relative to the forward direction than the common angle.

16. A system according to any one of claims 12 to 15, characterised in that the rearward section of the boundary wall of the female recess extends rearwardly to the rearward end of the fixture.

17. A system according to claim 6 or 7, characterised in that the predetermined surface of the boundary wall of the female recess is presented by a transverse section (525) of the boundary wall.

18. A system according to claim 17, characterised in that the transverse section of the boundary wall of the female recess is a transverse base of the female recess.

19. A system according to claim 17 or 18, characterised in that the female recess comprises a rearward conical portion which opens in the rearward end of the fixture and a polygonal forward section which communicates with the rearward conical portion at the rearward end thereof and which presents the transverse section at the forward end thereof.

20. A system according to any one of the preceding claims, characterised in the superstructure takes the form of an abutment (402) for bridging the soft tissue layer overlying the maxilla or mandible.

21. A system according to any one of the preceding claims, characterised in that at least a section of the outer surface of the fixture (305; 405; 505) is roughened for interlocking with the bone tissue, that the at least a section of the outer surface has a rearward edge and a forward edge and that the predetermined position on the outer surface is defined by the rearward edge or a position intermediate the rearward and forward edges.

22. A system according to claim 21 , characterised in that the at least a section of the fixture outer surface is macroroughened.

23. A system according to claim 21 or 22, characterised in that the at least a section of the fixture outer surface is microroughened.

24. A system according to claim 21, characterised in that the at least a section of the fixture outer surface is roughened by machining thereof.

25. A system according to any one of the preceding claims, characterised in that at least a forward section of the fixture which presents the forward end is adapted in use to be inserted into bone tissue for implantation of the fixture, that the at least a forward section has a rearward edge and that the predetermined position on the fixture outer surface is disposed at the rearward edge of the at least a forward section whereby the predetermined position on the fixture outer surface registers or substantially registers with the outer surface of the maxilla or mandible when the fixture is implanted.

26. A system according to any one of the preceding claims, characterised in that all or substantially all of the fixture outer surface is adapted to interlock with the bone tissue between the predetermined position on the fixture outer surface and the forward end of the fixture.

27. A system according to any one of the preceding claims, characterised in that the predetermined position on the fixture outer surface coincides with the rearward end of the fixture.

28. A system according to any one of the preceding claims, characterised in that the predetermined interfacing surfaces of the fixture and superstructure are unthreaded surfaces.

29. A system according to any one of the preceding claims, characterised in that the predetermined interfacing surfaces of the fixture and superstructure interface with one another through direct contact.

30. A fixture (301 ; 401; 501) for use in a system according to any one of claims 1 to 29.

31. A superstructure (402) for use in a system according to any one of claims 1 to 29.

32. A superstructure according to claim 31 in which the superstructure is an abutment (402) for bridging the soft tissue layer which overlies the maxilla or mandible.

33. A method of installing a dental restoration in the oral cavity of a patient comprising the steps of
providing a fixture (301 ; 401 ; 501) having an outer surface at least a section of which

(305; 405; 505) is adapted for interlocking with bone tissue (312, 314; 512, 514) of the maxilla or mandible,
providing a superstructure (402) on which the dental restoration is formed or mountable,
implanting the fixture in the maxilla or mandible of the patient in a forward direction such that at least a forward part of the at least a section of the outer surface is disposed adjacent the bone tissue of the maxilla or mandible, and
mounting the superstructure on the fixture such that the superstructure interfaces with the fixture in the forward direction on a surface of the fixture (409) positioned at a level forward of the position at which interlocking between the fixture outer surface and bone tissue commences.

34. A method according to claim 33 comprising the step of implanting the fixture such that the at least a section of the fixture outer surface is disposed adjacent bone tissue of the maxilla or mandible.

35. A method according to claim 33 or 34 comprising the steps of implanting the fixture such that interlocking between bone tissue of the maxilla or mandible and the fixture outer surface commences at the surface of the maxilla or mandible and mounting the superstructure on the fixture such that the superstructure and fixture interface in the forward direction through surfaces thereof positioned at a level forward of the surface of the maxilla or mandible.

36. A dental implant system substantially as hereinbefore described with reference to Figs 7 to 11 of the accompanying drawings.

37. A method of installing a dental restoration in the oral cavity of a patient substantially as hereinbefore described with reference to Figs 7 to 1 1 of the accompanying drawings.