Implant for dental prostheses

Abstract

An implant for dental prostheses includes an endosseous portion and a stump. The endosseous portion includes a crown margin configured to be opposed to a corresponding crown margin of the stump. At least one of the crown margins is conical or however has a different taper with respect to the opposed crown margin so that, once the stump has been coupled to the endosseous portion, the contact and interference surface between the crown margins is a reduced annular surface.

Claims

1. An implant (1a, 1b, 1c) for dental prostheses, comprising: an endosseous portion (2) configured to be implanted in a bone site of a dental arch; and a stump (3) configured to be fixed to said endosseous portion (2) and to be coupled to a dental prosthesis, wherein said endosseous portion (2) comprises a crown margin (24) suited to be opposed to a corresponding crown margin (33) of said stump (3), thereby defining a sealing area (5), wherein said crown margin (33) of the stump (3) is opposed to and smaller than said crown margin (24) of the endosseous portion (2), whereby a most external edge (35) of the crown margin (33) of the stump (3) is recessed with respect to a most external edge (26) of the crown margin (24) of the endosseous portion, wherein each one of said crown margins (33, 24) is a planar surface, said planar surfaces being not parallel to each other, wherein at least one of the crown margins (33, 24) of the endosseous portion or the stump lies on a conical surface while the other one of the crown margins (24, 33) of the endosseous portion or the stump lies on a straight or conical surface having a different taper, so that, once said stump (3) has been coupled to said endosseous portion (2), a contact and interference surface (51) between said crown margins (33, 24) is an annular surface that is smaller compared to a size of the crown margins (33, 24) and proximal to an external edge (35) of said crown margin (33) of said stump (3).

2. The implant (1a, 1b, 1c) for dental prostheses according to claim 1, wherein: said crown margin (33) of the stump (3) is conical, lying on the conical surface that widens in an apical direction, so that the external edge (35) of the crown margin (33) is closer to an apical end of the implant than an internal edge (36) thereof; said crown margin (24) of the endosseous portion (2) has an opposite taper with respect to a taper of said crown margin (33) of the stump (3) lying on the conical surface that widens in a coronal direction, so that an external edge (26) of the crown margin (24) of the endosseous portion (2) is closer to a coronal end of the implant than an internal edge (27) thereof, and wherein, when said stump (3) is coupled to said endosseous portion (2), the contact and interference surface (51) of the two opposed crown margins (33, 24) is essentially a circular line, near to or coinciding with said external edge (35) of the crown margin (33) of said stump (3).

3. The implant (1a, 1b, 1c) for dental prostheses according to claim 1, wherein: said crown margin (33) of the stump (3) is conical, lying on a conical surface that widens in an apical direction, so that the external edge (35) of the crown margin (33) is closer to an apical end of the implant than an internal edge (36); said crown margin (24) of the endosseous portion (2) lies on a straight plane, and wherein, when said stump (3) is coupled to said endosseous portion (2), the contact and interference surface (52) of the two opposed crown margins (33, 24) is essentially a circular line or band near to or coinciding with said external edge (35) of the crown margin (33) of said stump (3).

4. The implant (1a, 1b, 1c) for dental prostheses according to claim 1, wherein: said crown margin (24) of the endosseous portion (2) is conical, lying on a conical surface that widens in a coronal direction, so that an external edge (26) of the crown margin (24) of the endosseous portion (2) is closer to a coronal end of the implant than an internal edge (27) thereof; wherein said crown margin (33) of the stump (3) lies on a straight plane, and wherein, when said stump (3) is coupled to said endosseous portion (2), the contact and interference surface (53) of the two opposed crown margins (33, 24) is essentially a circular line or band near to or coinciding with said external edge (35) of the crown margin (33) of said stump (3).

5. The implant (1a, 1b, 1c) for dental prostheses according to claim 1, wherein said endosseous portion (2) comprises an axial grafting recess (23) of a corresponding grafting appendage (32) of said stump (3), and wherein said endosseous portion (2) comprises, in proximity to an opening of said grafting recess (23), an annular projection (25) configured to be inserted in a corresponding annular seat (34) present on said grafting appendage (32) of said stump (3), said annular projection (25) and said annular seat (34) being externally delimited by said crown margins (24, 33).

6. The implant (1a, 1b, 1c) for dental prostheses according to claim 1, wherein said opposed crown margins (33, 24) form a 1-5 angle.

Description

(1) The characteristics of the new implant will be highlighted in greater detail in the following description with reference to the attached drawings which are enclosed by way of non-limiting example.

(2) FIGS. 1a and 1b show the sectional views of two examples of the new implant for dental prostheses (1a, 1b) in two possible embodiments.

(3) FIG. 1c shows a sectional view of a further example of the new implant (1c) with a stump (3) that can be directly screwed in the endosseous portion (2).

(4) FIG. 2a shows a detail of the sealing area (5) between the stump (3) and the endosseous portion (2) in a first embodiment, while FIG. 2b shows a further enlarged detail of the non-parallel conical crown margins (33, 24) that provide the coupling between the stump (3) and the endosseous portion (2).

(5) FIG. 3a shows a detail of the sealing area (5) between the stump (3) and the endosseous portion (2) in a second embodiment, while FIG. 3b shows a further enlarged detail of the non-parallel conical crown margins (33, 24) that provide the coupling between the stump (3) and the endosseous portion (2).

(6) FIG. 4a shows a detail of the sealing area (5) between the stump (3) and the endosseous portion (2) in the embodiment with direct screwing, while FIG. 4b shows a further enlarged detail of the conical crown margins (33, 24) that provide the coupling between the stump (3) and the endosseous portion (2).

(7) FIGS. 5a and 5b show in detail two further possible embodiments of the crown margins (33, 24).

(8) FIG. 6 shows in detail how the maximum diameter of the crown margin (33) of the stump is shorter than the maximum diameter of the crown margin (24) of the endosseous portion (2).

(9) The new dental implant (1a, 1b, 1c) comprises in its main parts an endosseous portion (2) and a stump (3).

(10) Said endosseous portion (2) is suited to be implanted in the bone site of the gum, and comprises an external thread (21) for screwing into the bone site, and an axial hole (22), preferably at least partially threaded, for grafting and tightening said stump (3).

(11) Said stump (3) is suited to be fixed to said endosseous portion and in turn is used to fix the dental prosthesis.

(12) Said stump (3) comprises a grafting appendage (32) suited to be inserted in a corresponding axial recess (23) shaped in said axial hole (22) of the endosseous portion (2).

(13) In the embodiments illustrated in FIGS. 1a and 1b, said stump (3) comprises also a through axial hole (31) for the insertion of a tightening means or screw (4) suited to be screwed in said internally threaded axial hole (22) of the endosseous portion (2).

(14) Said screw (4) comprises a head (41) suited to be used by the operator to screw and tighten said stump (3) on said endosseous portion (2).

(15) In the embodiment illustrated in FIG. 1c, the outside of said grafting appendage (32) of the stump (3) is at least partially threaded (321) so that it can be directly screwed into said correspondingly threaded axial hole (22) of said endosseous portion (2).

(16) Said endosseous portion (2) comprises a crown margin (24) suited to be opposed to a corresponding crown margin (33) of said stump (3), thus defining a sealing area (5).

(17) Said crown margin (33) of the stump (3) is conveniently smaller than said crown margin (24) of the endosseous portion (2), that is, the most external edge (35) of the crown margin (33) of the stump (3) is recessed with respect to the most external edge (26) of the crown margin (24) of the endosseous portion, as shown in FIG. 6, in which the inclination angles of the crown margins (33, 24) are enlarged for explanation purposes.

(18) In all of the solutions described below said crown margins (33, 24) of the stump (3) and of the endosseous portion (2) lie on planar surfaces, of which at least one surface is conical, while the other surface is conical or planar and straight.

(19) FIG. 1a shows a first embodiment of the new dental implant (1a).

(20) In the solution illustrated in FIGS. 1b and 1c, the new dental implant (1b, 1c) is shaped in a different way, as described here below. Said endosseous portion (2) comprises an annular collar or projection (25) in proximity to the opening of said grafting recess (23) for the appendage (32) of the stump (3).

(21) In a corresponding position on said appendage (32), said stump (3) comprises an annular seat (34) suitable for the insertion of said annular projection (25) of the endosseous portion (2).

(22) Said annular projection (25) of the endosseous portion (2) and said annular seat (34) of the stump (3) are externally delimited by said crown margins (24, 33).

(23) Said crown margin (33) of the stump (3) and said crown margin (24) of the endosseous portion (2) have different taper, meaning that once said stump (3) has been grafted in said endosseous portion (2) the contact and interference surface (51) between said crown margins (33, 24) is a reduced annular surface compared to the size of the crown margins (33, 24) themselves.

(24) In particular, the two opposed margins (33, 24) are two non-parallel surfaces and the angle defined between them is preferably a 1-5 angle.

(25) In the solution represented in FIGS. 2b, 3b and 4b, said crown margin (33) of the stump (3) is conical, meaning that it lies on a conical surface that widens downwards, so that the external edge (35) of the crown margin (33) itself is lowered with respect to the internal edge (36).

(26) On the contrary, the taper of said crown margin (24) of the endosseous portion (2) is opposite with respect to that of said crown margin (33) of the stump (3), that is, it lies on a conical surface that widens upwards, so that the external edge (26) of the crown margin (24) itself is raised with respect to the internal edge (27).

(27) When said stump (3) is grafted in said endosseous portion (2), the contact and interference surface (51) of the two opposed crown margins (33, 24) is substantially circular, ideally a circular line near to or coinciding with the external edge (26, 35) of the crown margins (33, 24).

(28) According to a possible alternative solution schematically shown in FIG. 5a, said crown margin (33) of the stump (3) is conical, while said crown margin (24) of the endosseous portion (2) lies on a straight plane. In this case, the contact and interference surface (52) of the two opposed crown margins (33, 24) is substantially circular, ideally a circular line near to or coinciding with the external edge (26, 35) of the crown margins (33, 24).

(29) According to a possible alternative solution schematically shown in FIG. 5b, said crown margin (24) of the endosseous portion (2) is conical, while said crown margin (33) of the stump (3) lies on a straight plane. In this case, the contact and interference surface (53) of the two opposed crown margins (33, 24) is substantially circular, ideally a circular line near to or coinciding with the external edge (26, 35) of the crown margins (33, 24).

(30) These are the schematic outlines that are sufficient for the expert in the art to implement the invention, therefore, during production variants may be developed that do not affect the substance of the innovative concept disclosed herein.

(31) Therefore, with reference to the description provided above and the attached drawings, the following claims are expressed.