SHELL FOR ADAPTING A RETENTION ELEMENT AND METHOD FOR THE SAME

Abstract

In a shell for adapting a retention element to an anchoring element, and a method of forming a further retention element on an anchoring element including a shell, the shell has an internal cavity, the dimensions of which are matched to the external dimensions of the retention element and which is connectable to the retention element in an integral or form-fitting manner, and has an outer surface which is formed as a further retention element.

Claims

1: A shell for adaptation of a retention element on an anchoring element, wherein the shell has a cavity that lies on the inside, the dimensions of which are adapted to the outside dimensions of the retention element, and can be connected with the retention element with material fit or shape fit, and has an outer surface that is configured as a further retention element.

2: The shell according to claim 1, wherein the shell comprises one or more plastics.

3: The shell according to claim 1, wherein the shell comprises one or more metals.

4: The shell according to claim 1, wherein the shell is produced from a hybrid material, which is particularly composed of plastics, metals, ceramics and/or composite materials.

5: The shell according to claim 2, wherein the plastic or the hybrid material or the metal has a coloration that represents a dimension of the further retention element.

6: The shell according to claim 1, wherein the cavity has an undercut that holds the shell on the retention element or supports the hold on the retention element.

7: The shell according to claim 1, wherein the cavity has rotation symmetry along an axial direction.

8: The shell according to claim 1, wherein the cavity is adapted to the retention element that has reduced functionality due to wear.

9: The shell according to claim 1, wherein the cavity is adapted to the retention element, so as to expand the diameter of the existing retention element.

10: The shell according to claim 8, wherein the diameter of the further retention element corresponds to a next greater value of a standard product line.

11: The shell according to claim 1, wherein the cavity is dimensioned in such a manner that a free space for adhesive materials remains between the inner surface of the cavity and the surface of the retention element.

12: The shell according to claim 11, wherein the adhesive material is an adhesive or a cement.

13: The shell according to claim 1, wherein the retention is attached at or on implants or root pins.

14: The shell according to claim 1, wherein the outer surface of the further retention element deviates from a ball shape.

15: A method for the formation of a further retention element on an anchoring element, using the shell according to claim 1, comprising the steps: selecting a shell while paying attention to the dimensions of the retention element; setting the shell onto the rotation element; and setting a dental prosthesis onto the shell.

16: The method according to claim 15, which is used to replace the original retention element, the functionality of which has been reduced by wear.

17: The method according to claim 15, which is used to expand the dimensions of a retention element that is not worn away.

Description

[0037] In the following, some exemplary embodiments will be explained in greater detail using the drawing. This shows:

[0038] FIG. 1A a known implant having a ball head that has not been worn away, and a dental prosthesis set onto it, in a side view,

[0039] FIG. 1B a detail view from FIG. 1A,

[0040] FIG. 2 the implant from FIG. 1 with a worn ball head and a dental prosthesis set onto it, in a side view,

[0041] FIG. 3A the implant from FIG. 2 with a shell according to the invention in a side view,

[0042] FIG. 3B a detail view from FIG. 3A,

[0043] FIG. 4A the implant from FIG. 2 with a further shell according to the invention, in a side view,

[0044] FIG. 4B a detail view from FIG. 4A,

[0045] FIG. 5 the implant from FIG. 2 with a further shell according to the invention, in a side view,

[0046] FIG. 6A the repaired implant from FIG. 3A with a dental prosthesis set onto it, in a side view,

[0047] FIG. 6B a detail view from FIG. 6A, and

[0048] FIG. 7 an implant with ball head that is not worn away, and with a shell according to the invention, in a side view.

[0049] In the figures, the same or functionally equivalent elements are provided with the same reference symbols.

[0050] In FIG. 1A, the upper end of an implant IM, which end is not introduced into a bone of the patient, is shown, together with a dental prosthesis ZP and a matrix MA. The implant IM has a ball head KK at its upper end, as a retention element. The ball head KK serves as a patrix with regard to the matrix MA.

[0051] The implant IM shown in FIG. 1A is in a state of no wear, so that no wear locations have yet been formed on the ball head KK. Therefore the matrix MA surrounds the ball head KK partially on its underside that faces a neck HA, and lies against the ball head KK with shape fit and/or material fit. As a result, a holding force occurs between the dental prosthesis ZP lined with the matrix MA and the ball head KK, as becomes clear from the detail representation according to FIG. 1B.

[0052] In contrast, in FIG. 2 the implant IM from FIG. 1 is shown with a worn ball head KK. Along wear locations VS of the ball head, a reduction in the holding force takes place, which results from the reduction in the diameter of the ball head KK. The wear does not have to show itself, as shown in FIG. 2, so clearly that there are no contact locations or only contact locations that lie at the top between the ball head KK and the matrix MA. Even a lesser reduction in the diameter of the ball head KK already leads to a reduction in the holding force.

[0053] It is true that the wear locations VS from FIG. 2 are characteristic and are caused by affixing and removing the dental prosthesis ZP, but other wear profiles, in particular asymmetrical wear profiles and also wear locations on the top of the ball head can also occur. The holding force is reduced particularly greatly if the matrix MA no longer surrounds the ball head KK on the side that faces the neck HA, as shown in FIG. 2. In comparison with FIG. 1, it becomes clear that a retention element worn in such manner is no longer suitable for holding the dental prosthesis ZP.

[0054] For repair of the ball head KK from FIG. 2, a shell ball shell KS is now made available, as shown in FIG. 3A, which shell is applied over the worn ball head KK. In this regard, the shell KS has a cavity that lies in the inside, the dimensions of which cavity are adapted to the outside dimensions of the ball head KK in such a manner that a free space for a filler compound FM remains. The filler compound FM serves as an adhesive material and can be made available in the form of an adhesive or a cement, for example. Accordingly, the shell KS can be glued onto the retention element in the form of the ball head KK, so that a material-fit connection is produced. The shell KS then form the further retention element as a replacement of the retention element in the form of the ball head KK.

[0055] In this regard, the cavity can be configured along an axial direction that essentially follows the longitudinal direction of the implant IM, also with rotation symmetry. The ball shell KS can be composed of plastic, metal, veneers made of multiple plastic materials, as well as of ceramic or composite materials. FIG. 3B shows the region between ball shell KS and ball head KK at the lower end once again, in an enlarged representation.

[0056] A further possibility for repair of the worn ball head KK from FIG. 2 is shown in FIG. 4A. In this embodiment, a ball shell KS according to the invention having an undercut HS is made available, which shell is set onto the worn ball head KK. The undercut HS surrounds the lower base of the ball head, which remains in spite of wear and faces in the direction of the neck HA, and is thereby mechanically secured to prevent loosening. The ball shell KS can be composed of plastic, metal, veneers made of multiple plastic material, as well as of ceramic or composite materials.

[0057] In order to allow the ball shell KS to be set onto the worn ball head KK but nevertheless to guarantee a firm seat, the ball shell KS can be elastic as a whole or at specific locations. Furthermore, the cavity of the ball shell KS, which lies on the inside, can be adapted to the shape of the wear location VS, so that a shape-fit connection occurs between ball shell KS and worn ball head KK, as can be seen in FIG. 4B, in an enlarged representation.

[0058] However, in analogy to FIG. 3A, a filler compound FM can also be introduced into the cavity of the ball shell KS, so that the ball shell KS surrounds the ball head KK with material fit along the wear locations VS and/or at other locations at which no shape-fit connection occurs due to differences in shape between cavity and ball head KK. The filler compound FM that is introduced can be made available in the form of an adhesive or a cement, for example.

[0059] A further possibility for repair of the worn ball head from FIG. 2 is shown in FIG. 5. The ball shell KS with undercut, according to the invention, as shown above with regard to FIG. 4A, is here expanded by means of a circumferential extension FS. The extension FS expands the neck HA that lies between the shoulder region SB and the ball head KK in the radial direction and/or lengthens the neck HA in the longitudinal direction of the implant IM.

[0060] The ball shell KS can once again be composed of plastic, metal, veneers made of multiple plastic materials, as well as ceramic or composite materials. In particular, the extension FS can be made available in a material that is different from and essentially more elastic than the remainder of the ball head KK. In analogy to the embodiment described in FIG. 3A, the firm seat of the ball shell KS with extension FS can additionally be attached using a filler compound, aside from the purely mechanical attachment by means of the undercut. The filler compound FM that is introduced can be made available in the form of an adhesive or a cement, for example.

[0061] FIG. 6A shows an implant IM repaired using the ball shell KS from FIG. 3A, with a dental prosthesis ZP set on. It becomes clear that the ball shell KS that is applied for repair forms a retention element on its outside, which element stands in contact, with shape fit, with the matrix. Furthermore, the matrix MA now once again stands in contact with the implant in such a manner that the matrix MA surrounds the worn ball head KK, with the ball shell KS applied to it, on the side that faces the neck HA. It can therefore be seen that the repaired location is now suitable again for carrying the dental prosthesis ZP. It should be mentioned that the repair shown in FIG. 6A, using a shell according to FIG. 3A, can also take place for all the other repair variants according to FIG. 4A and FIG. 5 that were mentioned.

[0062] FIG. 7 shows a ball shell KS with an extension FS that was applied to a non-worn ball head KK so as to increase its outer dimensions. The ball head KK shown therefore corresponds to the ball head KK from FIG. 1A. The need to expand a non-worn ball head occurs, above all, because the ball head is allowed to have maximally the same diameter as the implant, since otherwise it would make introduction of the implant into the bone difficult. After the implant has grown firmly into the bone of the patient, however, the holding force that can be achieved with it is limited. The ball shell KS according to the invention for expansion of a non-worn ball head KK provides a remedy here. Also, expansion of the ball head diameter is necessary if the patient wishes to have a firmer or particularly firm hold of the dental implant.

[0063] The ball shell KS with extension FS shown in FIG. 7 stands as a representative for all other ball shell variants mentioned, which are also suitable for expansion of a non-worn ball head KK. Likewise, a filler compound can be used, which evens out shape-related free spaces between the ball shell KS and the ball head KK and/or guarantees a firm seat.

[0064] The term ball shell KS used in the figure description serves merely to refer to a hollow and partially open body. The body can, in fact, have a ball shape, but also other shapes, such as that of an ellipsoid, a cylinder, or of a block, for example. In this regard, the shape used can be selected in accordance with technical requirements.

[0065] Furthermore, the ball shells KS can have a coloration, in all the embodiments mentioned, which permit a conclusion regarding their dimensions. Usually, the ball heads KK are formed on implants IM in standard dimensions, wherein the balls shells KS described can be oriented on the basis of such standard dimensions with regard to their outside dimension, so that compatibility with existing systems of matrices exists.

[0066] Those types of retention elements that have an outer surface that is conical, cylindrical or shaped in some other way, and are equipped with a retentive effect are also included in the term of shell. The retentive effect can also come to bear in interaction with a silicone filler material that has an adjustable hardness. In this regard, this can involve the configuration that is usual in dental technology, with a projection or a recess, preferably running circumferentially, as they are implemented in abutments. Accordingly, by applying the shell KS, the retention element in the form of the ball head KK can also be converted to a further retention element that does not have a ball head but rather a different configuration that is usual in dental technology.

[0067] The characteristics indicated above, as well as the characteristics that can be derived from the figures, can be advantageously implemented both individually and in different combinations. The invention is not restricted to the exemplary embodiments described, but rather can be modified in many ways within the scope of the ability of a person skilled in the art.