Connection element for an abutment, hybrid abutment, and hybrid abutment crown, and method for producing same, implant-supported tooth replacement system
Patent Information
- Application Number
- EP2023734560
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-07-05
- Filing Date
- 2023-06-20
- Publication Date
- 2025-05-14
AI Technical Summary
Existing abutments for dental implants face challenges in mechanical stability and aesthetics, particularly when using zirconia materials, which can fail under stress and compromise the appearance of prosthetic restorations, and traditional connecting elements compromise strength and visibility when angled for screw placement.
A connecting element with a sleeve-shaped adhesion section and a fastening section that includes a radially outwardly curved area and a lateral recess, allowing for increased deflection angles and anti-rotation features, enhancing mechanical stability and aesthetics by maintaining strength and hiding the thinner wall from external view.
The solution provides increased flexibility and reliability in attaching and detaching abutments or abutment crowns, improving mechanical properties and aesthetics by allowing larger deflection angles and anti-rotation, while maintaining strength and reducing the visibility of the metallic connecting element.
Smart Images
Figure 1.1
Abstract
Description
[0001] Connecting element for an abutment, hybrid abutment and hybrid abutment crown and method for manufacturing, implant-supported dental prosthesis system
[0002] 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 dental prosthesis system. Furthermore, the invention relates to a method for producing a hybrid abutment or a hybrid abutment crown, as well as to the use of a connecting element.
[0003] In modern dentistry, dental implants are one of the most common and long-established standard treatments for replacing lost teeth. First, the dental implants are placed, which are then, after a specified healing period, fitted with prostheses such as crowns or bridges. The prosthetic restoration is typically attached to so-called abutments.
[0004] Abutments can be part of the dental implant (so-called one-piece dental implants) or not part of the dental implant and be designed as separate components (so-called two-piece dental implants). Abutments occupy a central position as the interface between the osseointegrated dental implants and the prosthetic restorations. As a transgingival connection, they support the peri-implant soft tissue and are responsible for the mechanical stability of the superstructures.
[0005] Abutments are typically made of titanium. However, a disadvantage of titanium abutments is that the properties of titanium can negatively affect the translucency and color of the prosthetic restoration. Therefore, in the past, zirconium dioxide abutments were regularly used instead of titanium abutments for two-piece dental implants, or even the abutment and crown were manufactured as an integral part of zirconium dioxide (so-called zirconium dioxide abutment crown). The disadvantage of these solutions, however, is that high stresses at the transition between the dental implant and the abutment often led to the failure of the zirconium dioxide abutment or the zirconium dioxide abutment crown.
[0006] To increase the aesthetics of the dental prosthesis while simultaneously minimizing the likelihood of failure, zirconium dioxide can be used as a material for the abutment or abutment crown in conjunction with a metallic connecting element (also called an adhesive sleeve or adhesive base). This connecting element is a coupling element that can be inserted, for example, from the apical side, into an abutment or abutment crown and bonded to the abutment or abutment crown. This connecting element forms a transition from the dental implant to the abutment or abutment crown. Such connecting elements typically have an adhesion portion, to which the abutment or abutment crown is bonded to the connecting element, and a fixing portion, to which the connecting element can be connected to a dental implant.The use of such connecting elements not only improves the visual impact of the entire prosthetic restoration compared to those using a metal abutment, but also increases the failure resistance compared to a ceramic abutment. The result is a so-called hybrid abutment, which comprises a connecting element and a ceramic abutment body, or a hybrid abutment crown, which comprises a connecting element and a ceramic abutment crown.
[0007] A further optical 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. In prosthetic restorations of dental implants in which the labial side of the tooth or the biting surface lies in the axial direction of the dental implant, this can be ensured if an angulation of the screw channel has been introduced 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 opening is arranged in the region of an opening of the abutment to be arranged on the connecting element.The aim is to enable an insertion tool to be used to rotate a screw that connects the connecting element to the dental implant, at an angle to the screw's longitudinal axis or to the dental implant's longitudinal axis. The maximum deflection, which results from the angle between the insertion tool and the dental implant's longitudinal axis, is influenced by the shape and design of the lateral opening.
[0008] A disadvantage of such connecting elements, however, is that the deeper the lateral opening, the more the strength of the connecting element and the adhesive bond between the connecting element and the abutment body is reduced. This means that failure of the hybrid abutment or hybrid abutment crown can occur even at lower loads. While increasing the diameter of the connecting element leads to improved mechanical properties of the connecting element, the thickness of the abutment body must then be reduced, which impairs the mechanical properties of the abutment body and makes it more likely to fail or at lower loads. Furthermore, 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 visible from the outside.
[0009] The invention is therefore based on the object of providing a solution that addresses at least one of the aforementioned problems. In particular, the object of the invention is to provide a solution that allows for the greatest possible flexibility when attaching and detaching an abutment or abutment crown to a dental implant without compromising the mechanical properties or optical properties of the dental prosthesis.
[0010] According to a first aspect, the object mentioned at the outset is achieved by a connecting element according to claim 1. Accordingly, a connecting element 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, is provided, comprising a fastening section for connection to a dental implant, which extends along a longitudinal axis and 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 designed as an adhesive surface and an inner surface surrounding a cavity, wherein the cavity is connected to the screw channel,wherein the adhesion portion has a first portion and a second portion, the first portion extending along the longitudinal axis from the fastening portion to the second portion, and the second portion extending along the longitudinal axis from the first portion in the direction of a tool engagement opening, the second portion of the adhesion portion having a lateral recess connected to the tool engagement opening and radially open with respect to the longitudinal axis, the first portion of the adhesion portion having an inner peripheral surface which, in the radial direction, has a buccal inner surface portion and a lingual inner surface portion opposite this buccal inner surface portion, the inner peripheral surface being curved and, in the region of the lingual inner surface portion, having a bulge pointing outwards in the radial direction.
[0011] The connecting element preferably has a plurality of cylindrical sections extending along the longitudinal axis. The connecting element can form a hybrid abutment or a hybrid abutment crown with an abutment body.
[0012] 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 complement 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 rotate about its longitudinal axis when 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 there is preferably a screw seat against which a screw head of a screw can be screwed when the screw is screwed in, so that the screw head then rests against 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 which forms the screw channel. The adhesion section is preferably sleeve-shaped. This means in particular that the adhesion section has a cavity which extends along the longitudinal axis. The cavity can in particular be cylindrical or cylinder-like. The adhesion section has an outer surface to which adhesive can be applied and an inner surface which in particular delimits the cavity. The first and the second section of the adhesion section are preferably arranged next to one another.Preferably, a lateral recess is present in the second section. The lateral recess can be configured in the form of a slot extending 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., to the first section. However, the lateral recess preferably has an edge that runs only partially parallel to the longitudinal axis, wherein the edge initially forms smoothly from the tool engagement opening and then, after running parallel to the longitudinal axis, closes smoothly again. The edge, in particular, has no corners.
[0013] The region of the radially outwardly curved lingual inner surface section is also referred to below as the radially outwardly curved region or the radially outwardly curved region. The radially outwardly curved region preferably forms a region of the first section that represents a bulge in an area below the lateral recess. The radial direction is to be understood in particular as a direction that runs outward from the longitudinal axis and orthogonal to the longitudinal axis. The radially outwardly curved region is to be understood as the region that is curved outward in the radial direction.
[0014] 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 other sections, but rather is expanded radially outward in this lingual inner surface section. This inner surface section is therefore located further away from a cross-sectional area center than the other areas of the inner circumferential surface.
[0015] A first advantage of such a connecting element is that the radially outwardly curved region, in conjunction with the lateral recess, allows for a particularly large deflection angle, within which an insertion tool can be positioned when screwing in a screw located in the connecting element and screwed into a dental implant. If a constant cross-section is provided for the radially outwardly curved region, the wall thickness in this region can be kept nearly constant, meaning that the strength of the connecting element is not negatively affected by this geometric design.
[0016] Since the radially outwardly curved area can preferably be located in the lingually oriented part of a prosthesis, any thinner wall of the prosthesis caused by the bulge is advantageously not visible from the outside. Thus, the aesthetic appearance of the overall restoration is not impaired.
[0017] At the same time, this bulge in the outer surface of the adhesion section serves as an anti-rotation device. The bulge ensures that the outer part of the prosthesis, which has a complementary indentation, can only be joined to the adhesive base in a defined position and cannot then be rotated relative to each other during subsequent use.
[0018] A further advantage of such a connecting element is that, among other things, due to the curvature of the inner contour of the radially outwardly curved area, a greater angulation of an insertion tool is possible.
[0019] A further advantage of such a connecting element is that the outer contour of the radially outwardly curved area results in an outer contour of the cross-section of the adhesion section, which is not circular due to the bulge in this area. As a result, the bulge acts as a rotation guard for an abutment body to be applied to the connecting element, advantageously preventing the connecting part and the abutment body to be applied from being rotated relative to each other along their longitudinal axis.
[0020] 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, wherein the longitudinal axis lies at a corresponding distance from the buccal, first lateral and second lateral inner surface section and the lingual inner surface section is curved radially outwards and lies at a greater radial distance from the longitudinal axis than the buccal inner surface section and the first and second inner surface section.
[0021] According to a particularly preferred embodiment, the radially outwardly curved lingual inner surface portion and the lateral recess are arranged adjacent to one another, and preferably arranged next to one another parallel to the longitudinal axis.
[0022] If the lateral recess and the radially outwardly curved area are arranged directly adjacent to one another, it is possible to achieve a particularly large deflection angle starting from the longitudinal axis, in which an insertion tool can be arranged when screwing in a screw located in the connecting element.
[0023] It is particularly preferred if the radially outwardly curved lingual inner surface section extends along the first section parallel to the longitudinal axis.
[0024] Preferably, the radially outwardly curved region along the longitudinal axis has a constant cross-section cut orthogonally to the longitudinal axis.
[0025] The lateral recess preferably extends along the second section parallel to the longitudinal axis. The lateral recess preferably has a curved contour, wherein the contour runs along a radiated path in the part of the lateral recess adjacent to the first region and is, in particular, curved in a circular arc or approximately in a circular arc. This allows mechanical stress peaks to be avoided and the insertion tool to be guided optimally.
[0026] 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 a wall is formed between the lingual inner surface section and the lingual outer surface section, which wall preferably has a constant wall thickness and is in particular uniform. The outwardly curved region preferably has a constant wall thickness. The outwardly curved region preferably has a constant cross-section along the first section parallel to the longitudinal axis.
[0027] Furthermore, it is preferred if the first section has a circular arc-shaped cross-section in the area outside the outwardly curved lingual inner surface section, wherein the center point of this circular arc lies on the longitudinal axis, wherein the radially outwardly curved lingual inner surface section has 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 lingual inner surface section.
[0028] In this case, the cross-section is to be understood in particular as the cross-section that is created by a cut orthogonal to the longitudinal axis. A circular arc is to be understood in particular as the part of a circle 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 the shape of a circular arc 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.
[0029] 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, wherein the center point of this circular arc lies on the longitudinal axis, wherein 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, 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 region.
[0030] 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 point 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 of this circular arc being 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 in the area outside the outwardly curved area has a circular arc-shaped cross-section, the center point of this circular arc lying on the longitudinal axis, the outer surface of the radially outwardly curved area having a circular arc-shaped cross-section, the center point of this circular arc being arranged at a distance from the longitudinal axis in the direction of the radially outwardly curved area.
[0031] Preferably, the wall thickness corresponds to the distance between the inner surface and the outer surface in the radial direction.
[0032] Preferably, the radius of the first portion in the area outside the outwardly curved lingual inner surface portion is greater than the radius of the radially outwardly curved lingual inner surface portion.
[0033] Furthermore, the radius of the inner surface and / or the outer surface of the first section in the region outside the outwardly curved region is preferably greater than the radius of the inner surface and / or the outer surface of the radially outwardly curved region.
[0034] Due to the different radii in this way, the radially outwardly curved area can develop as a bulge.
[0035] It is further preferred that the first section in the region outside the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis extending along the longitudinal axis, wherein the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis that is arranged at a distance from the longitudinal axis and extends parallel to the longitudinal axis.
[0036] Such a hollow cylinder is defined by the inner surface on the inside and the outer surface on the outside. It is a part of a hollow cylinder, since the basic structure is formed by a circular arc and thus only a section of a circle.
[0037] It is even more preferred that the outer surface of the second section has elevations, in particular groove-shaped elevations that preferably run in the circumferential direction. Elevations, in particular groove-shaped elevations that preferably run in the circumferential direction, are preferably arranged on the surface of the first section.
[0038] Preferably, a plurality of circumferential grooves are arranged on the outer surface of the adhesion portion, in particular on the outer surface of the second portion, which grooves extend substantially in the circumferential direction.
[0039] Such elevations, especially grooves, serve to improve the adhesive bond between the connecting element and the abutment body connected to it or to be connected. Due to the uneven outer surface created by the elevations, improved mechanical adhesion and thus an overall improved adhesive bond can be achieved.
[0040] Preferably, the connecting element comprises a shoulder arranged on the outer circumference of the connecting element and forming a shoulder surface arranged orthogonally to the longitudinal axis.
[0041] The shoulder is preferably arranged in the fastening section or in a transition area between the fastening section and the adhesion section.
[0042] It is preferred if the shoulder runs around the outer circumference of the connecting element and / or has a circular outer contour.
[0043] 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.
[0044] The radial extent of the shoulder is preferably, at least in some sections, greater than the radial extent of the adhesion section. The shoulder may, for example, have a circular outer contour, the center of which preferably coincides with the longitudinal axis. The shoulder may also have an oval or elliptical shape or outer contour.
[0045] It is further preferred if the outer circumference of the fastening section has, at least in sections, a non-round, preferably polygonal, in particular hexagonal, outer contour. It is particularly preferred if the connecting element comprises or consists of a biocompatible metal, preferably titanium.
[0046] The connecting element is preferably made of titanium. A titanium connecting element allows the advantageous mechanical properties of this material to be utilized. Using a titanium connecting element can significantly reduce the probability of failure compared to an all-ceramic abutment.
[0047] The term "titanium" used here refers specifically to pure titanium. Pure titanium is understood specifically as a titanium alloy with minimal alloying components. Titanium grade 4 or Ti4 according to ISO 5832-2 is preferably used as pure titanium.
[0048] However, the connecting element can also comprise or consist of a titanium alloy that is not pure titanium, in particular Ti-6AI-4V.
[0049] Preferably, the longitudinal axis is formed as a straight line. Then, the fastening section and the adhesion section extend along a straight line.
[0050] According to a particular embodiment, the longitudinal axis in the region of the adhesion section has a longitudinal axis section that is angled relative to a longitudinal axis section of the longitudinal axis in the region of the fastening section. With such a design of the connecting element, the adhesion section is formed at an angle to the fastening section, or a part of the adhesion section is formed at an angle to the fastening section.
[0051] According to a further aspect, the object 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, 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.
[0052] An adhesive channel is understood to mean, in particular, a recess and / or bore in the abutment body. The adhesive channel is preferably shaped such that the adhesion section of the connecting element can be received by this adhesive channel and the outer surface of the adhesion section can be bonded to the adhesive channel. The diameter of the adhesive channel is therefore preferably somewhat larger, for example corresponding to a clearance fit, than the outer diameter of the adhesion section of the connecting element, wherein, in particular, the radially outwardly curved region of the adhesion section is also accommodated in the adhesive channel. Due to the radially outwardly curved region, the adhesive channel is accordingly 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 be inserted into the abutment body particularly preferably up to the shoulder.
[0053] The abutment body may 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 by means of 3D printing.
[0054] It is preferred that the abutment body comprises or consists of a ceramic material, in particular zirconium oxide.
[0055] By using a ceramic material for the abutment body, very good mechanical properties can be achieved, particularly a relatively high specific strength and a relatively high specific stiffness. Furthermore, a ceramic abutment body ensures good aesthetics of the denture.
[0056] According to a further aspect, the object mentioned at the outset is achieved by a hybrid abutment crown comprising a connecting element as described here and an abutment crown body with an adhesive channel.
[0057] It is preferred that the adhesion portion 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 portion of the connecting element by means of an adhesive arranged between the adhesive channel and the adhesion portion.
[0058] The abutment crown body can comprise or consist of glass ceramic, in particular lithium disilicate ceramic, ceramic, in particular zirconium dioxide, or plastic, the shape of which was preferably created by means of 3D printing. It is preferred that the abutment crown body comprises or consists of a ceramic material, in particular zirconium oxide.
[0059] According to a further aspect, the object mentioned at the outset is achieved by an implant-supported dental prosthesis system, comprising a dental implant having a connecting portion with an internal thread, a connecting element as described here, an abutment body or an abutment crown body having an adhesive channel designed to connect the abutment body or the abutment crown body to the adhesion portion of the connecting element by means of an adhesive, wherein preferably the abutment body or the abutment crown body comprises or consists of 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 by means of 3D printing, 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 that can be screwed into the internal thread of the dental implant.
[0060] According to a further aspect, the object mentioned above 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 preferably comprises or consists of 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 by means of 3D printing, applying an adhesive to the outer surface of the adhesion section of the connecting element, arranging the abutment body on the connecting element such that the adhesion section of the connecting element is arranged in the adhesive channel of the abutment body,Curing of the adhesive to create a material bond between the connecting element and the abutment body.
[0061] According to a further aspect, the object mentioned at the outset is achieved by using a connecting element as described here for establishing 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 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 to the screw head of the screw via the tool engagement opening and / or the lateral recess, wherein the engagement tool is arranged at an angle relative to the longitudinal axis 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 when screwing the screw into the dental implant.
[0062] For the advantages, implementation variants and implementation details of the various aspects of the solutions described here and their respective possible further training, please also refer to the description of the corresponding features, details and advantages of the other aspects and their further training.
[0063] Preferred embodiments are explained by way of example with reference to the accompanying figures. They show:
[0064] Fig. 1 : a schematic representation of a connecting element in a perspective view,
[0065] 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,
[0066] Fig. 3: a sectional view of the connecting element shown in Fig. 1 in
[0067] Longitudinal section along the longitudinal axis, showing a state in which the connecting element is attached to a dental implant with a screw by means of an insertion tool,
[0068] Fig. 4: a schematic flow of a method for manufacturing a hybrid abutment or a hybrid abutment crown.
[0069] In the figures, identical or essentially functionally identical or similar elements are designated by 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.
[0070] 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 along the longitudinal axis L in the fastening section. The fastening section 3 is located at one end of the connecting element. The fastening section 3 has an outer contour 3a at a section which is intended to come into contact with the dental implant. The fastening section 3 thus has a shape 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.
[0071] 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. Thus, the adhesion section 4 has, in particular, an outer surface designed as an adhesive surface and an inner surface surrounding a cavity. The cavity is connected to the screw channel. An abutment body for creating a hybrid abutment or an abutment crown body for creating a hybrid abutment crown can be attached to the outer surface of this adhesion section 4 by means of an adhesive.
[0072] 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 toward a tool engagement opening 5a.
[0073] The second section 4b has a lateral recess 5b connected to the tool engagement opening 5a. The lateral recess 5b is delimited by an edge 7. To improve the 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 a radially outwardly curved region. The first section 4a thus has a region 6 that is curved outward in the radial direction.
[0074] The radially outwardly curved region 6 has both a curvature of the inner surface of this region and a curvature of the outer surface of this region. This radially outwardly curved region allows for greater deflection of a tool during the insertion of a screw.
[0075] A shoulder 2 is arranged in the transition area from the adhesion section 4 to the fastening section 3. The shoulder 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 is larger than that of the adhesion section 4 over at least most of the circumference. The shoulder 2 can have a circular outer contour, as shown here, whose center coincides with the longitudinal axis L.
[0076] Through each section of the connecting element runs along the longitudinal axis L a substantially round channel, 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.
[0077] Fig. 2 shows a sectional view of the connecting element shown in Fig. 1 in the first section 4a of the adhesion section 4 with the region 6 which is curved outwards in the radial direction. A screw seat 22 is arranged within the channel extending along the longitudinal axis L through the connecting element 1, which screw seat 22 serves to enable a screw to be inserted via the channel into the connecting element 1 into the screw channel 21 and then to be screwed into a dental implant, wherein the screw head of the screw then rests on the screw seat 22, so that a tight screw connection between the connecting element and the dental implant is made possible.
[0078] The first section 4a has a constant wall thickness. The radially outwardly curved region 6 also has a constant wall thickness. The center point M1 of the non-curved part of the first section coincides with the longitudinal axis L extending into the viewing plane in Fig. 2. The center point M2 of the curved region of the first section is spaced from the longitudinal axis L. Thus, the radius r1 of the non-curved part of the first section is greater than the radius r2 of the curved region of the first section.
[0079] Fig. 3 shows a sectional view of the connecting element 1 shown in Fig. 1 in longitudinal section along the longitudinal axis L, wherein the connecting element 1 is fastened to a dental implant 31 with a screw 32 by means of an insertion tool 33. 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 lateral recess 5b and then screwed into the dental implant 31 using an insertion tool 33 that extends along an insertion tool axis E. The screw 32 can be unscrewed from the dental implant 31 accordingly. Due to the lateral recess 5b and the radially outwardly curved region 6, the insertion tool 33 can be angled to the longitudinal axis L by an engagement angle a.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.
[0080] Fig. 4 shows a schematic sequence of a method 100 for producing a hybrid abutment or a hybrid abutment crown. The method 100 comprises 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 connecting element. In a step 140, arranging the abutment body on the connecting element such that the adhesion portion of the connecting element is arranged in the adhesive channel of the abutment body. In a step 150, the adhesive is cured to create a material-to-material bond between the connecting element and the abutment body.
[0081] 1 connecting element
[0082] 2 Paragraph 3 Fastening section 3a Outer contour of a section of the fastening section
[0083] 4 Adhesion section 4a first section of the adhesion section 4b second section of the adhesion section 4c grooves
[0084] 5a tool engagement opening 5b side recess
[0085] 6 radially outwardly curved area 7 edge of the lateral recess
[0086] 21 screw channel
[0087] 22 Screw seat 31 Dental implant
[0088] 32 Screw 33 Insertion tool a Pressure angle
[0089] D Diameter of the bulged area of the first section
[0090] E Insertion tool axis
[0091] L Longitudinal axis
[0092] M1 Center of the non-bulged part of the first section
[0093] M2 Center 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 Procedure
[0094] 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 designed as an adhesive surface and an inner surface (9) surrounding a cavity, wherein the cavity is connected to the screw channel,wherein the adhesion section (4) has a first section (4a) and a second section (4b), the first section extending along the longitudinal axis (L) from the fastening section to the second section, and the second section extending along the longitudinal axis from the first section in the direction of a tool engagement opening (5a), the second section (4b) of the adhesion section having a lateral recess (5b) connected to the tool engagement opening and radially open with respect to the longitudinal axis, characterized in that the first section (4a) of the adhesion section has an inner peripheral surface which, in the radial direction, has a buccal inner surface section and a lingual inner surface section (6) 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 region of the lingual inner surface section (6).
2. Connecting element according to the preceding claim, wherein the radially outwardly curved lingual inner surface portion (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 a second lateral outer surface section opposite this first lateral outer surface section, wherein a wall is formed between the lingual inner surface section and the lingual outer surface section, which wall preferably has a constant wall thickness and is in particular uniform.
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, wherein the center point (M1) of this circular arc lies on the longitudinal axis (L), wherein the radially outwardly curved lingual inner surface section (6) has a circular arc-shaped cross-section, wherein the center point (M2) of this circular arc in the direction of the radially outwardly curved lingual inner surface section at a distance from the longitudinal axis (L). 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 point (M1) of this circular arc lying on the longitudinal axis (L), wherein 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 point (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 region outside the outwardly curved lingual inner surface section is greater 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 region outside the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis that extends along the longitudinal axis, wherein the radially outwardly curved lingual inner surface section is designed as part of a hollow cylinder, with a cylinder axis that 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, wherein the shoulder is preferably arranged in the fastening section or in a transition region between the fastening section and the adhesion section, 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 formed as a straight line, or wherein the longitudinal axis in the region 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 region 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 the abutment body preferably comprises or consists of 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 by means of 3D printing.
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, wherein 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, wherein preferably the abutment crown body comprises or consists of 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 by means of 3D printing.
16. Implant-supported dental prosthesis system, comprising a dental implant (31) having a connecting portion 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 having an adhesive channel configured to connect the abutment body or the abutment crown body to the adhesion portion of the connecting element by means of an adhesive, wherein the abutment body or the abutment crown body preferably comprises or consists of 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 by means of 3D printing, and preferably a screw (32) that can be arranged in the screw channel of the fastening portion of the connecting element and has an external thread that can be screwed into the internal thread of the dental implant. A 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 preferably comprises or consists of 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 by means of 3D printing, Applying (130) an adhesive to the outer surface of the adhesion portion of the connecting element, Arranging (140) 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, Curing (150) the adhesive to create a material-locking 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) is arranged on a dental implant (31), and a screw (32) is inserted into the screw channel of the connecting element via the tool engagement opening (5a), and the screw is screwed into the dental implant by means of an insertion tool (33) which is guided to the screw head of the screw via the tool engagement opening and / or the lateral recess, wherein the engagement tool is arranged at an angle relative to the longitudinal axis 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 when screwing the screw into the dental implant.