WO2024008439A1

WO2024008439A1 - Connection element for an abutment, hybrid abutment, and hybrid abutment crown, and method for producing same, implant-supported tooth replacement system

Info

Publication number: WO2024008439A1
Application number: PCT/EP2023/066598
Authority: WO
Inventors: Stephan Meyer; Kamil FOLTYNA
Original assignee: Bego Implant Systems Gmbh & Co. Kg
Priority date: 2022-07-05
Filing date: 2023-06-20
Publication date: 2024-01-11
Also published as: DE102022116742A1

Abstract

The invention relates to a connection element (1), a hybrid abutment, a hybrid abutment crown, and an implant-supported tooth replacement system. The invention also relates to a method for producing a hybrid abutment or a hybrid abutment crown, and to a use of a connection element. The connection element comprises: a fastening portion (3) for connection to a tooth implant; and an adhesion portion (4), which extends along the longitudinal axis and is sleeve-like so that the adhesion portion has an outer surface, which is formed as an adhesive face, and an inner surface, which surrounds a hollow space, wherein the adhesion portion has a first (4a) and a second (4b) portion and the first portion extends from the fastening portion to the second portion, and the second portion extends from the first portion towards a tool-engagement opening (5a), wherein the second portion of the adhesion portion has a lateral recess (5b) connected to the tool-engagement portion and the first portion of the adhesion portion has a radially outwardly convex region (6).

Description

Connecting element for an abutment, hybrid abutment and hybrid abutment crown and method for producing, implant-supported tooth replacement system

The invention relates to a connecting element for an abutment, in particular for a hybrid abutment and/or a hybrid abutment crown. The invention also relates to a hybrid abutment, a hybrid abutment crown and an implant-supported tooth replacement system. The invention further relates to a method for producing a hybrid abutment or a hybrid abutment crown and to the use of a connecting element.

In modern dentistry, dental implants are one of the common and tried-and-tested standard treatments to replace lost teeth. First, the dental implants are placed, which are then fitted with prostheses such as crowns or bridges after a specified healing period. The prosthetic restoration is typically attached to so-called abutments. The

Abutments can be part of the dental implant (so-called one-piece dental implants) or not part of the dental implant and designed as separate components (so-called two-piece dental implants). Abutments occupy a central place as an interface between the osseo-integrated dental implants and the prosthetic restorations. As a transgingival connection, they support the peri-implatary soft tissue and are responsible for the mechanical stability of the superstructures.

Typically, abutments are made from titanium. However, a disadvantage of titanium abutments is that the properties of titanium affect the translucency and color of the can have a negative impact on prosthetic care. Therefore, in the past, instead of titanium abutments, abutments made of zirconia were regularly used for two-piece dental implants, or even the abutment and the crown were made as an integral part of zirconia (so-called zirconia abutment crown). However, the disadvantage of these solutions is that high stresses at the transition from the dental implant to the abutment often lead to failure of the abutment made of zirconium oxide or the abutment crown made of zirconium dioxide.

In order to increase the aesthetics of the denture and at the same time keep the probability of failure low, zirconium dioxide can be used as a material for the abutment or the abutment crown in conjunction with a metal connecting element (also called an adhesive sleeve or adhesive base). Such a connecting element is a coupling element that can be inserted, for example from apically, into an abutment or an abutment crown and glued to the abutment or the abutment crown. This connecting element forms a transition from the dental implant to the abutment or to the abutment crown. Such connecting elements typically have an adhesion section at which the abutment or the abutment crown is bonded to the connecting element, and a fastening section at which the connecting element can be connected to a dental implant. When using such connecting elements, on the one hand, the optical effect of the entire prosthetic restoration is improved compared to those in which a metallic abutment is used. On the other hand, this increases the reliability of failure compared to a ceramic abutment. The result is a so-called hybrid abutment, which includes a connecting element and a ceramic abutment body, or a hybrid abutment crown, which includes a connecting element and a ceramic abutment crown.

A further visual improvement can be achieved if the opening of the screw channel is no longer visible from outside the patient's mouth. It should therefore be avoided that when using the hybrid abutment or the hybrid abutment crown, the exit channel of the screw is located on the labial side of the tooth or its biting surface. For prosthetic restorations of dental implants in which the labial side of the tooth or the bite surface lies in the axial direction of the dental implant, this can be ensured if the screw channel is angled within the hybrid abutment or the hybrid abutment crown. From EP3023078 and EP3244825 it is known to provide a connecting element which has a lateral opening in the upper part of the connecting element, which is arranged in the area of an opening in the abutment to be arranged on the connecting element. This is intended to ensure that an insertion tool can be used to turn a screw that connects the connecting element to the dental implant, angled to the longitudinal axis of the screw or to the longitudinal axis of the dental implant. The maximum deflection, which results as an angle between the insertion tool and the longitudinal axis of the dental implant, is structurally influenced by the shape and design of the side opening.

However, a disadvantage of such connecting elements is that the deeper the lateral opening is, the more the strength of the connecting element and the adhesive bond between the connecting element and the abutment body are reduced. Failure of the hybrid abutment or the hybrid abutment crown can occur even at lower loads. Increasing the diameter of the connecting element leads to improved mechanical properties of the connecting element, but the thickness of the abutment body then has to be reduced, which deteriorates the mechanical properties of the abutment body and causes it to fail with a higher probability or at lower loads. In addition, reducing the thickness of the abutment body can have a negative impact on the aesthetics of the entire prosthetic restoration, as the metallic connecting element becomes more clearly visible from the outside.

The invention is therefore based on the object of providing a solution which addresses at least one of the problems mentioned. In particular, it is the object of the invention to provide a solution that enables the greatest possible flexibility when attaching and detaching an abutment or an abutment crown to a dental implant, without thereby impairing the mechanical properties or the optical properties of the denture.

According to a first aspect, the aforementioned task is solved by a connecting element according to claim 1. Accordingly, a connecting element is provided for an abutment, in particular for a hybrid abutment and/or a hybrid abutment crown, preferably for attaching a hybrid abutment and/or a hybrid abutment crown to a dental implant, comprising a fastening section for connection with a dental implant that extends along a longitudinal axis and has a corresponding has a screw channel extending along the longitudinal axis for receiving a screw, and an adhesion section which extends along the longitudinal axis and is sleeve-shaped, so that the adhesion section has an outer surface which is designed as an adhesive surface and an inner surface surrounding a cavity, the cavity having is connected to the screw channel, wherein the adhesion section has a first section and a second section and the first section extends along the longitudinal axis from the fastening section to the second section and the second section extends along the longitudinal axis from the first section towards a tool engagement opening, wherein the second section of the adhesion section has a lateral recess connected to the tool engagement opening and which is radially open with respect to the longitudinal axis, the first section of the adhesion section having an inner circumferential surface which has a buccal inner surface section in the radial direction and a lingual inner surface section opposite this buccal inner surface section , wherein the inner peripheral surface is curved and has a bulge pointing outwards in the radial direction in the area of the lingual inner surface section.

The connecting element preferably has a plurality of cylindrical sections which extend along the longitudinal axis. The connecting element can form a hybrid abutment or a hybrid abutment crown with an abutment body.

The fastening section is preferably designed to be connected to a dental implant by means of a screw. The fastening section is preferably designed to be complementary to the connecting section of a corresponding dental implant. For example, the fastening section can have an outer contour in the lower region that corresponds to an inner contour of a dental implant. The outer contour can preferably be designed as an external hexagon and inserted into an internal hexagon of a dental implant, whereby the connecting element can no longer be rotated about the longitudinal axis when it is inserted or placed into the dental implant. The screw channel is preferably designed as a bore, in particular with a constant diameter. At the upper end of the screw channel, a screw seat is preferably arranged, against which a screw head of a screw can be screwed when the screw is screwed in, so that the screw head then rests on the screw seat. The screw channel preferably has a central axis which coincides with the longitudinal axis. The central axis is to be understood in particular as a central axis of the bore that forms the screw channel. The adhesion section is preferably sleeve-shaped. This is to be understood in particular as meaning that the adhesion section has a cavity which extends along the longitudinal axis. The cavity can in particular be cylindrical or similar to a cylinder. The adhesion section has an outer surface on which adhesive can be applied and an inner surface which in particular delimits the cavity. The first and second sections of the adhesion section are preferably arranged next to one another. A lateral recess is preferably present in the second section. The lateral recess can be designed in the form of a slot which extends from the upper end of the second section, i.e. at the tool engagement opening, to the lower end of the second section, i.e. up to the first section. However, the lateral recess preferably has an edge which only partially runs parallel to the longitudinal axis, the edge initially forming smoothly from the tool engagement opening and then closing smoothly again after a parallel course to the longitudinal axis, the edge in particular having no corners having.

The area of the lingual inner surface section that is curved radially outwards is also referred to below as an area that is curved outwards in the radial direction or as an area that is curved radially outwards. The radially outwardly curved region preferably forms a region of the first section, which represents a bulge in a region below the lateral recess. The radial direction is to be understood in particular as a direction which, starting from the longitudinal axis, runs outwards orthogonally to the longitudinal axis. The area that is curved radially outwards is to be understood as meaning the area that is curved outwards in the radial direction.

The bulge is to be understood as meaning that the inner circumferential surface in the lingual inner surface section does not follow the course of the inner circumferential surface in the remaining sections, but is expanded outwards in the radial direction in this lingual inner surface section. This inner surface section is therefore further away from a cross-sectional surface center than the remaining areas of the inner circumferential surface.

A first advantage of such a connecting element is that due to the radially outwardly curved area in conjunction with the lateral recess, a particularly large deflection angle can be achieved in which an insertion tool when screwing in a screw that is located in the connecting element and into a dental implant is screwed in, can be arranged. If a constant cross section of the radially outwardly curved area is provided, the wall thickness in this area can be made almost constant, so that the strength of the connecting element is not negatively influenced by this geometric design.

Since the radially outwardly curved region can preferably be arranged in the part of a prosthesis that is lingually aligned, a wall of the prosthesis that may be thinner due to the curve is advantageously not visible from the outside. This means that there is no deterioration in the aesthetic appearance of an overall restoration.

At the same time, this bulge in the outer surface of the adhesion section has the function of anti-rotation. The bulge means that the outer part of the prosthesis, which has a complementary indentation, can only be brought together with the adhesive base in a defined position and then cannot be twisted in relation to one another during further use.

A further advantage of such a connecting element is that, among other things, a greater angulation of an insertion tool is made possible due to the curvature of the inner contour of the area curved radially outwards.

A further advantage of such a connecting element is that due to the outer contour of the radially outwardly curved area, an outer contour of the cross section of the adhesion section results, which is not circular due to the bulge in this area. As a result, the bulge acts as a rotation protection for an abutment body to be applied to the connecting element, so that the connecting part and the abutment body to be applied cannot be rotated relative to one another along the longitudinal axis in an advantageous manner.

It is preferred if the first section of the adhesion section has an inner circumferential surface which, in the radial direction, has a buccal inner surface section, a lingual inner surface section opposite this buccal inner surface section, a first lateral inner surface section between this lingual and buccal inner surface section and a second lateral inner surface section opposite this first lateral inner surface section has, wherein the longitudinal axis is at a consistent distance from the buccal, first lateral and second lateral inner surface portions and the lingual inner surface portion lies radially outward is curved and lies at a greater radial distance from the longitudinal axis than the buccal inner surface section and the first and second inner surface sections.

According to a particularly preferred embodiment, the radially outwardly curved lingual inner surface section and the lateral recess are arranged adjacent to one another, and preferably arranged next to one another parallel to the longitudinal axis.

If the lateral recess and the radially outwardly curved area are arranged directly adjacent to one another, it can be achieved that a particularly large deflection angle can be achieved starting from the longitudinal axis, in which an insertion tool is screwed in when a screw is screwed in, which is located in the connecting element , can be arranged.

It is particularly preferred if the radially outwardly curved lingual inner surface section extends along the first section parallel to the longitudinal axis.

Preferably, the radially outwardly curved region along the longitudinal axis has a constant cross section cut orthogonally to the longitudinal axis.

Preferably, the lateral recess extends along the second section parallel to the longitudinal axis. The lateral recess preferably has a curved contour, with the contour running along a path provided with radii on the part of the lateral recess adjacent to the first region and in particular being curved in the shape of a circular arc or approximately in the shape of a circular arc. This means that mechanical stress peaks can be avoided and the insertion tool can be guided optimally.

It is particularly preferred that the first section on the side of the adhesive surface has a buccal outer surface section, a lingual outer surface section opposite this buccal outer surface section, a first lateral outer surface section between this lingual and buccal outer surface section and a second lateral outer surface section opposite this first lateral outer surface section, wherein between the lingual inner surface section and the lingual outer surface section form a, in particular uniform, radially outwardly curved wall, which preferably has a constant wall thickness. Preferably, the outwardly curved area has a constant wall thickness. Preferably, the outwardly curved region has a constant cross section along the first section parallel to the longitudinal axis.

It is further preferred if the first section in the area outside the outwardly curved lingual inner surface section has a circular-arc-shaped cross section, the center of this circular arc lying on the longitudinal axis, the radially outwardly curved lingual inner surface section having a circular-arc-shaped cross section, the center of which Circular arc is arranged at a distance from the longitudinal axis in the direction of the radially outwardly curved lingual inner surface section.

The cross section is to be understood in particular as the cross section that is generated during a cut orthogonal to the longitudinal axis. A circular arc is understood to mean, in particular, the part of a circular line belonging to a circular sector. Preferably, the first section runs in the shape of a circular arc in the area outside the outwardly curved area and has a wall thickness. Preferably, the first section runs in a circular arc shape in the area of the outwardly curved area and has a wall thickness. The wall thicknesses in the two areas can be the same or different. Preferably the wall thickness is the same in both areas.

Furthermore, it is preferred if the buccal outer surface section, the first lateral outer surface section and the second lateral outer surface section form a circular arc-shaped cross section, the center of this circular arc lying on the longitudinal axis, the buccal inner surface section, the first lateral inner surface section and the second lateral Inner surface section form a circular arc-shaped cross section, the center of this circular arc being arranged at a distance from the longitudinal axis in the direction of the radially outwardly curved area.

It is preferred if the inner surface of the first section in the area outside the outwardly curved area has a circular arc-shaped cross section, the center of this circular arc lying on the longitudinal axis, the inner surface of the radially outwardly curved area having a circular arc-shaped cross section, the center point This circular arc is arranged at a distance from the longitudinal axis in the direction of the radially outwardly curved area. Furthermore, it is preferred if the outer surface of the first section has a circular-arc-shaped cross section in the area outside the outwardly curved region, the center of this circular arc lying on the longitudinal axis, the outer surface of the radially outwardly curved region having a circular-arc-shaped cross section, wherein the Center point of this circular arc is arranged at a distance from the longitudinal axis in the direction of the radially outwardly curved area.

Preferably, the wall thickness corresponds to the distance between the inner surface and the outer surface in the radial direction.

Preferably, the radius of the first section in the area outside the outwardly curved lingual inner surface section is larger than the radius of the radially outwardly curved lingual inner surface section.

Further preferably, the radius of the inner surface and/or the outer surface of the first section in the region outside the outwardly curved region is larger than the radius of the inner surface and/or the outer surface of the radially outwardly curved region.

Due to the different radii in this way, the area that is curved radially outwards can form a bulge.

It is further preferred that the first section in the area outside the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis which extends along the longitudinal axis, wherein the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder is, with a cylinder axis which is arranged at a distance from the longitudinal axis and extends parallel to the longitudinal axis.

Such a hollow cylinder is bounded on the inside by the inner surface and on the outside by the outer surface. It is part of a hollow cylinder, as the basic structure is formed by a circular arc and therefore only a section of a circle.

It is even further preferred that the outer surface of the second section has elevations, in particular groove-shaped elevations which preferably run in the circumferential direction. Preferably, elevations, in particular groove-shaped elevations which preferably run in the circumferential direction, are arranged on the surface of the first section.

Preferably, a plurality of circumferential grooves are arranged on the outer surface of the adhesion section, in particular on the outer surface of the second section, which extend essentially in the circumferential direction.

Such elevations, in particular such grooves, serve to improve the adhesive bond between the connecting element and the abutment body connected or to be connected to it. Due to the uneven outer surface caused by the elevations, improved mechanical adhesion and thus an overall improved adhesive connection can be achieved.

Preferably, the connecting element comprises a shoulder which is arranged on the outer circumference of the connecting element and forms a shoulder surface which is arranged orthogonally to the longitudinal axis.

The shoulder is preferably arranged in the fastening section or in a transition area between the fastening section and the adhesion section.

It is preferred if the shoulder runs around the outer circumference of the connecting element and/or has a circular outer contour.

Such a shoulder enables, in particular, axial support, i.e. support in the direction of the longitudinal axis, of the abutment body connected or to be connected to the connecting element.

The radial extent of the shoulder is preferably larger, at least in sections, than the radial extent of the adhesion section. The shoulder can, for example, have a circular outer contour, the center of which preferably coincides with the longitudinal axis. The heel can also have an oval or elliptical shape or outer contour.

It is further preferred if the outer circumference of the fastening section has, at least in sections, a non-round, preferably a polygonal, in particular hexagonal, outer contour. It is particularly preferred if the connecting element comprises or consists of a biocompatible metal, preferably titanium.

The connecting element preferably consists of titanium. With a connecting element made of titanium, the advantageous mechanical properties of this material can be exploited. When using a connecting element made of titanium, the probability of failure can be significantly improved compared to an all-ceramic abutment.

The term titanium used here refers in particular to pure titanium. Pure titanium is to be understood in particular as a titanium alloy with minimal alloy proportions. Titanium grade 4 or Ti4 according to ISO 5832-2 is preferably used as the pure titanium.

However, the connecting element can also comprise or consist of a titanium alloy that is not pure titanium, in particular Ti-6AI-4V.

The longitudinal axis is preferably designed as a straight line. Then the fastening section and the adhesion section extend along a straight line.

According to a special embodiment, it is provided that the longitudinal axis in the area of the adhesion section has a longitudinal axis section which is oriented at an angle to a longitudinal axis section of the longitudinal axis in the area of the fastening section. In such a configuration of the connecting element, the adhesion section is designed obliquely to the fastening section or a part of the adhesion section is designed obliquely to the fastening section.

According to a further aspect, the task mentioned at the outset is achieved by a hybrid abutment, comprising a connecting element as described here and an abutment body with an adhesive channel, the adhesion section of the connecting element being arranged in the adhesive channel of the abutment body and the adhesive channel of the abutment body with the Adhesion section of the connecting element is connected by means of an adhesive arranged between the adhesive channel and the adhesion section.

An adhesive channel is understood to mean, in particular, a recess and/or hole in the abutment body. The adhesive channel is preferably shaped in such a way that the adhesion section of the connecting element is received by this adhesive channel can be and the outer surface of the adhesion section can be glued to the adhesive channel. The diameter of the adhesive channel is therefore preferably slightly larger, for example corresponding to a clearance fit, than the outer diameter of the adhesion section of the connecting element, in particular also the radially outwardly curved region of the adhesion section being included in the adhesive channel. Due to the radially outwardly curved area, the adhesive channel is preferably not circular in cross section. The length of the adhesive channel is preferably at least as long as the length of the adhesion section, so that the connecting element can particularly preferably be inserted into the abutment body up to the shoulder.

The abutment body can comprise or consist of glass ceramic, in particular lithium disilicate ceramic, ceramic, in particular made of zirconium dioxide, or plastic, the shape of which was preferably constructed using 3D printing.

It is preferred that the abutment body comprises or consists of a ceramic material, in particular zirconium oxide.

By using a ceramic material for the abutment body, very good mechanical properties can be achieved, in particular a relatively high specific strength and a relatively high specific stiffness. In addition, a ceramic abutment body ensures good aesthetics of the denture.

According to a further aspect, the aforementioned object is achieved by a hybrid abutment crown, comprising a connecting element as described here and an abutment crown body with an adhesive channel.

It is preferred that the adhesion section of the connecting element is arranged in the adhesive channel of the abutment crown body and the adhesive channel of the abutment crown body is connected to the adhesion section of the connecting element by means of an adhesive arranged between the adhesive channel and the adhesion section.

The abutment crown body can comprise or consist of glass ceramic, in particular lithium disilicate ceramic, ceramic, in particular made of zirconium dioxide, or plastic, the shape of which was preferably constructed using 3D printing. It is preferred that the abutment crown body comprises or consists of a ceramic material, in particular zirconium oxide.

According to a further aspect, the task mentioned at the outset is achieved by an implant-supported tooth replacement system, comprising a dental implant, having a connecting section with an internal thread, a connecting element as described here, an abutment body or an abutment crown body, which has an adhesive channel that is formed to connect the abutment body or the abutment crown body to the adhesion section of the connecting element by means of an adhesive, wherein preferably the abutment body or the abutment crown body is a ceramic material, in particular zirconium oxide, or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular made of zirconium dioxide, or a plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of, and preferably a screw which can be arranged in the screw channel of the fastening section of the connecting element and has an external thread which can be screwed into the internal thread of the dental implant.

According to a further aspect, the aforementioned object is achieved by a method for producing a hybrid abutment or a hybrid abutment crown, comprising the following steps: providing a connecting element as described here, providing an abutment body of a hybrid abutment or a hybrid abutment - Crown, wherein the abutment body has an adhesive channel, and wherein the abutment body is preferably a ceramic material, in particular zirconium oxide, or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular made of zirconium dioxide, or a plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of, applying an adhesive to the outer surface of the adhesion section of the connecting element, arranging the abutment body on the connecting element so that the adhesion section of the connecting element is arranged in the adhesive channel of the abutment body, curing the adhesive to produce a cohesive connection between the connecting element and the abutment body.

According to a further aspect, the aforementioned object is achieved by using a connecting element as described here to produce a connection between a dental implant and a connecting element or a hybrid abutment or a hybrid abutment crown, in such a way that the connecting element element is arranged on a dental implant, and a screw is inserted into the screw channel of the connecting element via the tool engagement opening, and the screw is screwed into the dental implant by means of an insertion tool which is guided via the tool engagement opening and/or the side recess to the screw head of the screw , wherein the engagement tool is arranged at an angle relative to the longitudinal axis when screwing the screw into the dental implant in the direction of the lateral recess of the connecting element and in the direction of the radially outwardly curved region of the connecting element.

For the advantages, design variants and design details of the various aspects of the solutions described here and your respective possible training courses, please also refer to the description of the corresponding features, details and advantages of the other aspects and your training courses.

Preferred exemplary embodiments are explained using the accompanying figures as examples. Show it:

1: a schematic representation of a connecting element in a perspective view,

Fig. 2: a sectional view of the connecting element shown in Fig. 1 in cross section orthogonal to the longitudinal axis in the first section of the adhesion section,

Fig. 3: a sectional view of the connecting element shown in Fig. 1

Longitudinal section along the longitudinal axis, showing a state in which the connecting element is attached to a dental implant with a screw using an insertion tool,

Fig. 4: a schematic flow of a method for producing a hybrid abutment or a hybrid abutment crown.

In the figures, identical or essentially functionally identical or similar elements are designated with the same reference numerals. Fig. 1 shows a connecting element 1 for a hybrid abutment or a hybrid abutment crown for attaching the hybrid abutment or the hybrid abutment crown to a dental implant.

The connecting element 1 has a fastening section 3 for connection to a dental implant. The fastening section 3 extends along a longitudinal axis L. A screw channel for receiving a screw extends in the fastening section along the longitudinal axis L. The fastening section 3 is located at one end of the connecting element. The fastening section 3 has an outer contour 3a on one section, which is intended to come into contact with the dental implant. The fastening section 3 thus has a shape that is complementary to the coronal end of the dental implant. The outer contour 3a of the lower region of the fastening section 3 can, for example, be designed as an external hexagon, as shown here. This external hexagon fits into a corresponding internal hexagon of the matching dental implant.

Furthermore, the connecting element 1 has an adhesion section 4, which also extends along the longitudinal axis L. The adhesion section 4 is sleeve-shaped. The adhesion section 4 therefore has, in particular, an outer surface which is designed as an adhesive surface and an inner surface surrounding a cavity. The cavity is connected to the screw channel. On the outer surface of this adhesion section 4, an abutment body for producing a hybrid abutment or an abutment crown body for producing a hybrid abutment crown can be attached using an adhesive.

The adhesion section 4 has a first section 4a and a second section 4b. The first section 4a extends along the longitudinal axis L from the fastening section 3 to the second section 4b. The second section 4b extends along the longitudinal axis L from the first section 4a in the direction of a tool engagement opening 5a.

The second section 4b has a lateral recess 5b connected to the tool engagement opening 5a. The lateral recess 5b is limited by an edge 7. To improve adhesion of the adhesive to the outer surface of the second section 4b, circumferentially extending grooves 4c are provided on the outer surface of the second section 4b. The lateral recess 5b does not extend over the entire longitudinal extent of the adhesion section 4, but only along the second section 4b. At the lower end of the lateral recess 5b, a bulge 6 adjoins the lateral recess 5b in an area that is curved radially outwards. The first section 4a thus has an area 6 that is curved outwards in the radial direction.

The radially outwardly curved area 6 has, on the one hand, a curvature of the inner surface of this area and a curvature of the outer surface of this area. This area, which is curved radially outwards, can ensure a greater deflection of a tool during the insertion of a screw.

A paragraph 2 is arranged in the transition area from adhesion section 4 to fastening section 3. The paragraph 2 serves to axially support the part of an abutment body connected to the connecting element 1. Therefore, the radial extent of the shoulder 2 over at least most of the circumference is greater than that of the adhesion section 4. The shoulder 2 can have a circular outer contour, as shown here, the center of which coincides with the longitudinal axis L.

A substantially round channel runs through each section of the connecting element along the longitudinal axis L, which is larger in the area of the tool engagement opening 5a than in the area of the screw channel and which deviates slightly from a circular channel in the radially outwardly curved area 6.

2 shows a sectional view of the connecting element shown in FIG. which serves to ensure that a screw can be inserted into the connecting element 1 into the screw channel 21 via the channel and can then be screwed into a dental implant, the screw head of the screw then resting on the screw seat 22, so that a tight screw connection between the connecting element and the dental implant is made possible.

The first section 4a has a constant wall thickness. The radially outwardly curved area 6 also has a constant wall thickness. The center M1 of the non-bulged part of the first section coincides with the longitudinal axis L running into the viewing plane in FIG. 2. The center M2 of the bulging area of the The first section is arranged at a distance from the longitudinal axis L. Thus, the radius r1 of the non-bulged part of the first section is larger than the radius r2 of the bulged area of the first section.

3 shows a sectional view of the connecting element 1 shown in FIG. To insert the screw 32 into the dental implant 31, the screw 32 is inserted into the screw channel via the tool engagement opening 5a and/or the side recess 5b and then screwed into the dental implant 31 using an insertion tool 33 which extends along an insertion tool axis E. The screw 32 can be unscrewed from the dental implant 31 accordingly. The insertion tool 33 can be angled at a pressure angle a to the longitudinal axis L due to the lateral recess 5b and the radially outwardly curved region 6. Both the lateral recess 5b and the radially outwardly curved area 6 contribute to a particularly large pressure angle a, which enables a high degree of flexibility when screwing in and unscrewing.

4 shows a schematic flow of a method 100 for producing a hybrid abutment or a hybrid abutment crown. The method 100 includes the following steps: In a first step 110, providing a connecting element 1. In a step 120, providing an abutment body of a hybrid abutment or a hybrid abutment crown, wherein the abutment body has an adhesive channel, and wherein the abutment body preferably comprises or consists of a ceramic material, in particular zirconium oxide. In a step 130, applying an adhesive to the outer surface of the adhesion portion of the fastener. In a step 140, arranging the abutment body on the connecting element so that the adhesion portion of the connecting element is arranged in the adhesive channel of the abutment body. In a step 150, curing of the adhesive to create a cohesive connection between the connecting element and the abutment body.

1 connecting element

2 paragraph 3 fastening section 3a outer contour of a section of the fastening section

4 adhesion section 4a first section of the adhesion section 4b second section of the adhesion section 4c grooves

5a tool engagement opening 5b lateral recess

6 radially outwardly curved area 7 edge of the side recess

21 screw channel

22 screw seat 31 dental implant

32 Screw 33 Insertion tool a Pressure angle

D Diameter of the bulging area of the first section

E Insertion tool axis

L longitudinal axis

M1 Center point of the non-bulging part of the first section

M2 Center point of the bulged area of the first section r1 Radius of the non-bulged part of the first section r2 Radius of the bulged area of the first section 100 Method

110-150 process steps

Claims

Claims Connecting element (1) for an abutment, in particular for a hybrid abutment and/or a hybrid abutment crown, preferably for attaching a hybrid abutment and/or a hybrid abutment crown to a dental implant, comprising a fastening section (3 ) for connection to a dental implant, which extends along a longitudinal axis (L) and has a screw channel (21) extending along the longitudinal axis for receiving a screw, and an adhesion section (4) which extends along the longitudinal axis (L) and is sleeve-shaped, so that the adhesion section has an outer surface, which is designed as an adhesive surface, and an inner surface (9) surrounding a cavity, the cavity being connected to the screw channel, the adhesion section (4) having a first section (4a) and a second section (4b) and the first section extends along the longitudinal axis (L) from the fastening section to the second section and the second section extends along the longitudinal axis from the first section towards a tool engagement opening (5a), the second section (4b) of the adhesion section has a lateral recess (5b) which is connected to the tool engagement opening and is radially open with respect to the longitudinal axis, characterized in that the first section (4a) of the adhesion section has an inner circumferential surface which has a buccal inner surface section in the radial direction and has a lingual inner surface section (6) opposite this buccal inner surface section, the inner circumferential surface being curved and having a bulge pointing outwards in the radial direction in the area of the lingual inner surface section (6). 2. Connecting element according to the preceding claim, wherein the radially outwardly curved lingual inner surface section (6) and the lateral recess (5b) are arranged adjacent to one another, and are preferably arranged next to one another parallel to the longitudinal axis.

3. Connecting element according to at least one of the preceding claims, wherein the radially outwardly curved lingual inner surface section (6) extends along the first section parallel to the longitudinal axis, and / or wherein the lateral recess extends along the second section parallel to the longitudinal axis.

4. Connecting element according to at least one of the preceding claims, wherein the first section (4a) on the side of the adhesive surface has a buccal outer surface section, a lingual outer surface section opposite this buccal outer surface section, and preferably a first lateral outer surface section between this lingual and buccal outer surface section and preferably one thereof First lateral outer surface section opposite second lateral outer surface section, wherein between the lingual inner surface section and the lingual outer surface section a, in particular uniform, radially outwardly curved wall is formed, which preferably has a constant wall thickness.

5. Connecting element according to at least one of the preceding claims, wherein the first section (4a) has a circular arc-shaped cross section in the area outside the outwardly curved lingual inner surface section, the center (M1) of this circular arc lying on the longitudinal axis (L), the radial outwardly curved lingual inner surface section (6) has a circular arc-shaped cross section, the center (M2) of this circular arc is arranged at a distance from the longitudinal axis (L) in the direction of the radially outwardly curved lingual inner surface section. Connecting element according to at least one of the preceding claims, wherein the buccal outer surface section, and preferably the first lateral outer surface section and preferably the second lateral outer surface section, form a circular arc-shaped cross section, the center (M1) of this circular arc lying on the longitudinal axis (L), the buccal inner surface section , and preferably a first lateral inner surface section and preferably a second lateral inner surface section form a circular arc-shaped cross section, the center (M2) of this circular arc being arranged at a distance from the longitudinal axis (L) in the direction of the radially outwardly curved region. Connecting element according to at least one of the preceding claims, wherein the radius (r1) of the first section in the area outside the outwardly curved lingual inner surface section is larger than the radius (r2) of the radially outwardly curved lingual inner surface section. Connecting element according to at least one of the preceding claims, wherein the first section (4a) in the area outside the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis which extends along the longitudinal axis, the radially outwardly curved lingual Inner surface section is designed as part of a hollow cylinder, with a cylinder axis which is arranged at a distance from the longitudinal axis and extends parallel to the longitudinal axis. Connecting element according to at least one of the preceding claims, wherein the outer surface of the second section has elevations (4c), in particular groove-shaped elevations which preferably run in the circumferential direction. 10. Connecting element according to at least one of the preceding claims, comprising a shoulder (2) which is arranged on the outer circumference of the connecting element and forms a shoulder surface which is arranged orthogonally to the longitudinal axis, the shoulder preferably being in the fastening section or in a transition area between the fastening section and the adhesion section is arranged, wherein the shoulder preferably runs around the outer circumference of the connecting element and / or has a circular outer contour.

1 1 . Connecting element according to at least one of the preceding claims, wherein the outer circumference of the fastening section (3) has, at least in sections, a non-round, preferably a polygonal, in particular hexagonal, outer contour (3a).

12. Connecting element according to at least one of the preceding claims, wherein the connecting element comprises or consists of a biocompatible metal, preferably titanium.

13. Connecting element according to at least one of the preceding claims, wherein the longitudinal axis is designed as a straight line, or wherein the longitudinal axis in the area of the adhesion section has a longitudinal axis section which is aligned at an angle to a longitudinal axis section of the longitudinal axis in the area of the fastening section.

14. Hybrid abutment, comprising a connecting element (1) according to at least one of claims 1-13, and an abutment body with an adhesive channel, wherein the adhesion section of the connecting element is arranged in the adhesive channel of the abutment body and the adhesive channel of the abutment body is connected to the adhesion section of the connecting element by means of an adhesive arranged between the adhesive channel and the adhesion section, wherein preferably the abutment body has a ceramic material , in particular zirconium oxide, or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular made of zirconium dioxide, or a plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of.

15. Hybrid abutment crown, comprising a connecting element (1) according to at least one of claims 1-13, and an abutment crown body with an adhesive channel, the adhesion section of the connecting element being arranged in the adhesive channel of the abutment crown body and the adhesive channel of the abutment -Crown body is connected to the adhesion section of the connecting element by means of an adhesive arranged between the adhesive channel and the adhesion section, the abutment crown body preferably being a ceramic material, in particular zirconium oxide, or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular made of zirconium dioxide, or a Plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of.

16. Implant-supported denture system, comprising a dental implant (31), having a connecting section with an internal thread, a connecting element (1) according to at least one of claims 1-13, an abutment body or an abutment crown body which has an adhesive channel which is designed to connect the abutment body or the abutment crown body to the adhesion section of the connecting element by means of an adhesive, wherein preferably the abutment body or the abutment crown body comprises a ceramic material, in particular zirconium oxide , or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular made of zirconium dioxide, or a plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of it, and preferably a screw (32) which is in the screw channel of the fastening section of the connecting element can be arranged and has an external thread that can be screwed into the internal thread of the dental implant. Method (100) for producing a hybrid abutment or a hybrid abutment crown, comprising the following steps:

Providing (110) a connecting element (1) according to one of claims 1-13,

Providing (120) an abutment body of a hybrid abutment or a hybrid abutment crown, wherein the abutment body has an adhesive channel, and wherein the abutment body is preferably a ceramic material, in particular zirconium oxide, or a glass ceramic, in particular lithium disilicate ceramic, or a ceramic, in particular Zirconium dioxide, or a plastic, the shape of which was preferably constructed using 3D printing, comprises or consists of,

Applying (130) an adhesive to the outer surface of the adhesion section of the connecting element,

Arranging (140) the abutment body on the connecting element so that the adhesion section of the connecting element is arranged in the adhesive channel of the abutment body,

Hardening (150) of the adhesive to create a cohesive connection between the connecting element and the abutment body. Use of a connecting element according to one of claims 1-13 for producing a connection between a dental implant and a connecting element or a hybrid abutment or a hybrid abutment crown, in such a way that - the connecting element (1) on a dental implant (31) is arranged, and a screw (32) is inserted into the screw channel of the connecting element via the tool engagement opening (5a), and the screw is guided by means of an insertion tool (33), which is guided via the tool engagement opening and/or the side recess to the screw head of the screw, is screwed into the dental implant, the engagement tool being arranged at an angle relative to the longitudinal axis when the screw is screwed into the dental implant in the direction of the lateral recess of the connecting element and in the direction of the radially outwardly curved region of the connecting element.