WO2024089018A1 - Élément de structure pour un système d'implant dentaire et système d'implant dentaire comprenant un tel élément de structure - Google Patents

Élément de structure pour un système d'implant dentaire et système d'implant dentaire comprenant un tel élément de structure Download PDF

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Publication number
WO2024089018A1
WO2024089018A1 PCT/EP2023/079604 EP2023079604W WO2024089018A1 WO 2024089018 A1 WO2024089018 A1 WO 2024089018A1 EP 2023079604 W EP2023079604 W EP 2023079604W WO 2024089018 A1 WO2024089018 A1 WO 2024089018A1
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WO
WIPO (PCT)
Prior art keywords
abutment
index element
index
abutment body
modulus
Prior art date
Application number
PCT/EP2023/079604
Other languages
German (de)
English (en)
Inventor
Holger Zipprich
Richard DONACA
Original Assignee
Holger Zipprich
Donaca Richard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Holger Zipprich, Donaca Richard filed Critical Holger Zipprich
Publication of WO2024089018A1 publication Critical patent/WO2024089018A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0066—Connecting devices for joining an upper structure with an implant member, e.g. spacers with positioning means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0065—Connecting devices for joining an upper structure with an implant member, e.g. spacers with expandable or compressible means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0068—Connecting devices for joining an upper structure with an implant member, e.g. spacers with an additional screw
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0069—Connecting devices for joining an upper structure with an implant member, e.g. spacers tapered or conical connection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/0078—Connecting the upper structure to the implant, e.g. bridging bars with platform switching, i.e. platform between implant and abutment

Definitions

  • the invention relates to a structural part for a dental implant system with an abutment body which has a connecting pin which can be inserted into a corresponding receiving channel of a post part and which tapers continuously at least in sections towards its distal end. It also relates to a dental implant system with a post part which can be screwed into the jawbone of a patient and with such a structural part.
  • Dental prosthetic systems can be used as part of reconstructive therapy to compensate for the loss of a tooth.
  • a prosthetic system usually includes a dental implant, which is usually inserted into the jawbone in place of an extracted or lost tooth. After a healing phase of around four to twelve weeks, a prosthetic part or a crown serving as a tooth replacement is then placed on the dental implant as a prosthetic construction and fixed there.
  • a dental implant is usually designed as a suitably shaped metal or ceramic body that is screwed into the intended place in the jawbone.
  • the dental implant usually has a mostly self-tapping screw thread at the apical end, with which the dental implant is inserted into the appropriately prepared implant bed.
  • two- or multi-piece implant systems are also known and widely used.
  • a multi-piece dental implant system in addition to the actual dental implant, also known as the "post part", which is screwed into the patient's jawbone, a so-called abutment is provided in the form of a connecting or transition piece, which carries the prosthetics or crown intended as a tooth replacement. After the actual dental implant has healed into the jawbone, After the patient has completed the dental prosthetic system, the abutment with the prosthetics is placed on the dental implant and connected to it.
  • Such a connection between the abutment intended for attaching the prosthetics and the inserted dental implant is usually made using a screw connection.
  • the abutment is usually provided with a connecting pin that can be inserted into an associated receiving channel in the dental implant in the manner of a plug connection and, when assembled, ensures lateral and, if necessary, axial guidance and fixed positioning of the components relative to one another.
  • a screw channel for a connecting screw intended for connecting the abutment to the dental implant is usually integrated into this connecting pin.
  • the connecting screw penetrates the screw channel and its external thread engages a corresponding internal thread in the dental implant.
  • the screw head of the connecting screw rests on a countersunk face in the abutment located outside the screw channel and presses the abutment part onto the post part via this when the connecting screw is screwed in.
  • dental implants or implant systems are usually made of titanium or a titanium alloy and are designed as two-part implants of the type described above. This means that the implant body is osseointegrated in the jawbone and an abutment is mounted on this, to which the final prosthetics can be fixed.
  • most implant-abutment connections are provided with a rotational locking mechanism, which is referred to as an index.
  • This index can be clearly designed or have any number of positioning options for the abutment in the implant body.
  • do not have an index there are usually two to six positioning options, preferably three or four.
  • the first ceramic implants were designed as a single piece and then provided with a cemented or glued implant-structure connection in the second step.
  • various variants with screwed implant-structure connections It has been found that the comparatively delicate manufacturing, which is possible with metallic implants made of titanium or titanium alloys, is also necessary for reasons of space when installing them in the jaw area.
  • the ceramic implants known to date such delicate manufacturing with a correspondingly small space requirement is hardly feasible due to the material properties of the ceramic. This means that the space requirement for corresponding connections with sufficient mechanical strength is hardly achievable.
  • the difficulty lies in the fact that connections between ceramic components mainly have point-by-point contact due to the relatively rough surface and the lack of deformability and flowability of ceramic materials, and only very rarely do they have the flat contact surfaces that are actually required to transfer relatively large forces between the components. This is mainly because metals can deform plastically at room temperature and ceramics cannot.
  • the publication WO 2012/065718 A1 discloses a method in which a softer but very well-adhering plastic layer is applied to the conical area of the abutment that transmits force between the implant body and the abutment. This ensures that the surface roughness and unevenness are evened out and that the force is transmitted across the surface between the implant body and the abutment.
  • the strength of conical and fully ceramic implant-abutment connections with a metal connecting screw could be increased significantly, as this layer compensates for the corresponding manufacturing tolerances and roughness and avoids point contact between the components.
  • the invention is therefore based on the object of providing a structural part of the above-mentioned type which, despite the difficulties mentioned, has a particularly high mechanical stability even when only very little space is available at the place of use. Furthermore, a dental implant with such a structural part is to be specified.
  • this object is achieved according to the invention with an abutment or abutment part which is itself made up of several, preferably two, parts and which, in addition to the actual abutment body or first abutment part, has as a second abutment part an index element arranged at the distal end on the connecting pin of the abutment body in a rotationally secure manner and made of a material which has an E-modulus of at most 60% of the E-modulus of the material forming the abutment body.
  • the invention is based on the idea that in order to overcome the above-mentioned problems when choosing comparatively brittle materials such as ceramic for the abutment part, the latter should have an index or indexing area with which, if index fractures occur, their spread into the conical area of the abutment part is consistently prevented.
  • the index or indexing area should be designed as an independent second component, designed differently from the actual abutment body in terms of material, which can be attached to the cone of the first abutment section or “actual” abutment part.
  • the index part should be made of a material that can plastically deform at room temperature in the contact area between the index part and the "actual" abutment part.
  • the design should be chosen in such a way that the plastic deformation of the material occurs before a fracture can even occur in the ceramic fixation area of the abutment part. This can prevent the formation of fractures in the first place.
  • Such a multi-component design of the abutment part can in particular provide for a consistent functional separation of the two components from one another, with the actual abutment body, as the first abutment section, being specifically designed and constructed to absorb and transmit comparatively large forces, such as chewing forces.
  • the second abutment section i.e. the index element, is not designed to subsequently transmit larger forces and can therefore also be dimensioned weaker. Rather, it serves to correctly guide the components in rotation during assembly, during which the aim is to achieve a correct rotational alignment of the abutment relative to the post part when the connecting pin is inserted into the corresponding receiving channel provided in the post part. This can be reliably achieved without the index element having to be designed to be particularly resistant to external forces.
  • the index element preferably has a suitably selected index, for example by selecting a suitably selected outer contour or a suitably selected outer cross-section, for example in the form of a hexagon, an oval or trioval, suitably selected outer projections or any other non-round shape suitable for indexing, which corresponds to an associated inner indexing in the receiving channel of the post part.
  • the index element is attached right at the distal end of the abutment body; according to one aspect of the invention, the index element also has a length of at most 25%, preferably at most 20%, very particularly preferably 15% of the total length of the attachment part in the longitudinal direction of the system.
  • the length ratio between the index element provided for indexing on the one hand and the connecting pin, which is in particular conical and is provided for the transmission of forces and moments, is suitably selected; the index element has a maximum length of 50%, preferably a maximum of 33%, of the length of the connecting pin.
  • the design objective mentioned can also or alternatively be achieved in principle with a large number of possible parameter combinations, particularly with regard to the dependence on the actual and corresponding, in particular geometric, design of the connection between the structural part and the index part.
  • the two parts forming the structural part are suitably designed, in particular with regard to the choice of their E-modules relative to one another.
  • the abutment body is advantageously made of a ceramic material, because the multi-part design provided makes it possible to overcome the obstacles to using ceramic materials in dental implants.
  • the abutment body preferably consists of a zirconium oxide ceramic, an aluminum oxide-reinforced zirconium oxide ceramic or a mixed ceramic or a ceramic mixture with a high proportion of zirconium oxide and/or aluminum oxide.
  • the abutment body is particularly preferably made of a material with an elastic modulus of at least 180 GPa, preferably of at least 200 GPa.
  • metals such as titanium, zirconium, tantalum and alloys with one of the metals as the main component are generally preferred, especially when using ceramic as the material for the abutment body.
  • the reason for this is not only the inherent plastic deformability of these metals, but also the ability to deform elastically at lower mechanical stresses. This property is expressed in the characteristic value of the modulus of elasticity.
  • the metals mentioned have in particular an modulus of elasticity of less than 60% of the modulus of elasticity of zirconium oxide ceramics and are therefore particularly suitable for material pairing with these ceramics in the sense of the present invention.
  • the modulus of elasticity of these metals is only about 50% of that of the abutment body.
  • the index element provided as the second structural part of the structural part is made from a plastic, preferably PPS, fiber-reinforced PPS, PEEK or fiber-reinforced PEEK, according to one aspect of the invention.
  • the index element is made from a material with an modulus of elasticity of at most 120 GPa, preferably at most 80 GPa, particularly preferably at most 10 GPa.
  • the following Young's modulus values are assumed: ZrÜ2: 210 GPa, Ti: 105 GPa, PEEK (fiber-reinforced, e.g. available from Ensinger under TEKATEC PEEK): 59 GPa, PEEK (nominal): 4.2 GPa, PPS: 4.1 GPa, PPS (fiber-reinforced): 6.0 - 8.5 GPa.
  • the abutment with abutment body and index element which is designed in two parts according to one aspect of the invention, these should be mechanically connected to one another in the sense of pre-assembly. Due to the two-part or possibly multi-part design of the abutment with the abutment body as the first structural part and the index element or index part as the second structural part, there is a desire for a possibility of pre-assembly in which the index element can be attached to the abutment body in such a way that the ensemble pre-assembled in this way can be pushed as a whole into the receiving channel of the post part.
  • the index element can thus bring about the correct rotational alignment of the abutment body relative to the post part when the connecting pin is pushed into the receiving channel.
  • this connection between the abutment body and index element is a detachable connection, whereby the only decisive factor is that the abutment part remains non-destructive. This is important because the prosthetics are anchored to it and the abutment part is the significantly more cost-intensive part of the abutment as a whole. For example, there is a risk that a dental technician or dentist could accidentally destroy the index part when handling the components. In such a case, it is important that the index part can be replaced or exchanged quickly and easily.
  • connection between the abutment body and the index element is therefore preferably not based on bonding or cementing or any other material-locking or permanent connection, but is designed as a purely mechanical connection, for example in the form of a snap-in connection. This has the advantage that if the index element needs to be replaced, there are no adhesive or cement residues left on the abutment part that need to be removed, which could be laborious to remove.
  • connection mechanism between the abutment body and the index element With regard to the connection mechanism between the abutment body and the index element, according to further aspects of the invention, the following basic design options for a corresponding coupling system can be provided:
  • An alternative, particularly preferred option for designing a coupling system according to one aspect of the invention is that a rotational locking mechanism is created between the abutment body and the index element by means of a number of axially aligned finger-like pins arranged off-center on one of the components in relation to the longitudinal axis of the system, which engage in the axial direction in associated mold recesses in the other component, such as in a claw coupling.
  • a rotational locking mechanism is created between the abutment body and the index element by means of a number of axially aligned finger-like pins arranged off-center on one of the components in relation to the longitudinal axis of the system, which engage in the axial direction in associated mold recesses in the other component, such as in a claw coupling.
  • the implementation of a design similar to a claw coupling for the coupling system between the abutment part and the index part should advantageously be designed in such a way that, in addition to the rotational position fixation after the components have been connected, i.e. after the finger-like pins or pegs have been inserted or pushed into the associated mold recesses, the two components can no longer be easily separated from one another, in particular without targeted action by the user.
  • the pins in combination with the associated mold recesses are designed as locking or snap connections.
  • the molded recess advantageously arranged in the abutment body preferably has a widening from the apical direction towards the occlusal direction, which tapers again towards the distal end and thus forms an undercut or retention for the adapted shaped pin or peg on the index element.
  • the molded recess is initially designed in the form of a funnel from the apical direction towards the distal end in order to simplify centering before insertion. In addition to optimized insertion, this also results in optimized strength for the index part. This means that when subjected to a torque load, the index part is not loaded at the thinnest point, but in the area of a widening of the pin or peg on the index element.
  • the design can also be the other way round.
  • the pins or pegs are arranged on the abutment body, whereas the associated mold recesses are provided in an end contact area of the index element.
  • the variant with the pins or pegs arranged on the index element is, however, the preferred one, since according to one aspect of the invention, a mechanical failure based on a torque between the abutment body and the index element would result in the pins or pegs breaking.
  • such a break or fracture of the respective pin or peg should affect the index element, which is easier to exchange and replace, rather than the more expensive abutment body.
  • the pins or pegs should therefore be part of the index element and not part of the abutment body in order to limit damage in the event of a fracture.
  • index element intended for attachment to the distal end of the connecting pin of the abutment body and suitably designed with features of the variants described above is considered to be independently inventive.
  • the above-mentioned object is achieved with a post part that can be inserted into the jawbone of a patient, and with a mounting part of the type described above, wherein the post part has a receiving channel provided for receiving the connecting pin including the index element arranged thereon in a rotationally secure manner.
  • the attachment part is fixed to the post part by means of a connecting screw which has an external thread at the end and which is screwed into a Internal thread engages in the receiving channel of the post part, and the screw head rests on a screw seat in the abutment body.
  • the system components mentioned are coordinated with one another in terms of their dimensions in such a way that the connecting screw cannot engage in the associated internal thread in the post part or be screwed into it if the index of the index part is not inserted into the associated index of the implant.
  • the implant system is designed in such a way that the connecting screw cannot fall out of the abutment complex if it is not screwed into the implant.
  • This makes it possible to pre-assemble the components in the sense that an ensemble of abutment body and index element (which together form the superstructure or abutment) and the connecting screw can be prefabricated and, if necessary, stored for a longer period of time. If the abutment is then to be placed on the post part, this can be achieved particularly easily and, in particular, with particularly short treatment times for the patient by using such a pre-assembled ensemble and inserting it; all that is then required is to tighten the connecting screw in the post part.
  • the connecting screw is designed with a screw head, a screw shaft and a threaded area, the screw shaft being at least partially reduced in external diameter compared to the nominal thread diameter
  • the index element can preferably be designed in such a way that the minimum centric passage lies in its diameter between the nominal thread diameter and the reduced diameter area of the screw shaft. In this way, the connecting screw can be secured without a The screw is specifically designed for this thread and is then caught in the index element so that it can no longer fall out.
  • the principle that and how a connecting screw cannot fall out of the abutment is basically known; it is usually achieved by a thread cut or formed into the abutment (e.g. in the case of abutments made of titanium) into which the connecting screw can be screwed.
  • the function of preventing the connecting screw from falling out is usually given when the connecting screw is screwed in.
  • the E-modules of the three components abutment body, index element and connecting screw are suitably matched to one another, there is no fracture transfer from a failing index element to the abutment body while observing the prevention of the connecting screw falling out.
  • the E-modules are preferably and according to one aspect of the invention coordinated as follows:
  • the elastic modulus of the connecting screw is 50% ⁇ 5% / ⁇ 10% of the elastic modulus of the abutment body
  • E-modulus of the index body ⁇ 100%, preferably ⁇ 50%, particularly preferably ⁇ 25% of the E-modulus of the connecting screw
  • the index element consists at least partially of a plastic
  • the index part consists at least partially of a plastic (e.g. PEEK, PPS or a fiber-reinforced, preferably carbon fiber-reinforced or otherwise reinforced plastic), the index element returns slightly after the screw has been turned and prevents the connecting screw from falling out.
  • a plastic e.g. PEEK, PPS or a fiber-reinforced, preferably carbon fiber-reinforced or otherwise reinforced plastic
  • the implant system is also designed so that if the index element should need to be replaced, the final rotational position of the abutment body relative to the post part is not affected as a result of the replacement of the index part.
  • the user who replaces the index part should not place the index element in a wrong position.
  • This object is achieved according to one aspect of the invention in that the number of possible rotational positionings between the abutment body and the index element is advantageously exactly the same as between the abutment and the implant. If the number were different, error-free fixation of the index part to the abutment part could not be guaranteed in all cases. However, a further option offers the advantage of being safe from confusion.
  • the dental technician or dentist cannot choose a position between the index part and the abutment part in which the relative position between the abutment (abutment part) and the implant changes.
  • the dental technician can specify the rotational position of the index in relation to the rotational position of the area of the abutment that receives the prosthetics in the CAD in order to achieve an optimized design of the prosthetics.
  • the highest priority is to avoid confusion.
  • the situation is different with prefabricated non-rotationally symmetrical abutments. For example, with angled abutments or so-called aesthetic abutments. The latter often have an oval shape and a preparation border that is not at the same height. This ovality and preparation border is prepared for the expected anatomical conditions of the hard and soft tissue in the patient's mouth.
  • the dentist takes the rotational alignment of the implant or the rotational index alignment of the implant into account so that the prefabricated abutments can actually be fixed by the dental technician in the desired and anatomically favorable rotational alignment.
  • the dentist should have as few rotational options as possible for fixing the abutment when positioning the abutments.
  • the dental technician would prefer a large number of options for rotational alignment. If, for example, an implant index allows 4 possible rotational positions, the practitioner must take this into account when positioning the implant in order to give the dental technician the chance of achieving the optimal positioning.
  • the dental technician would be able to allow two other positions for the index part in addition to the one specified original position, which would be plus or minus 30° to the original position. 5 positions would also be advantageous, as the gradation of the rotational options by the dental technician would now be even smaller. In such a case, an equal number or a multiple of each other would be rather disadvantageous. In this way, the rotational scope for the practitioner when inserting the implant in the bone could be increased, without having to accept the disadvantages of prefabricated and non-rotationally symmetrical abutments (non-rotationally symmetrical areas bearing the prosthetics).
  • FIG. 1 a structural part for a dental implant in side view
  • FIG. 2 the assembly part according to FIG. 1 in exploded view
  • FIG. 3 shows the structural part according to FIG. 1 in a perspective view in an exploded view
  • FIG. 4 a claw coupling schematically in different views
  • FIG. 5 a pin coupling schematically in different views
  • FIG. 6 the end area of an abutment body of the abutment part FIG. 1 in a partially enlarged side view
  • FIG. 7 shows an index element of the structural part of FIG. 1 in a side and perspective view
  • FIG. 8 a dental implant system in longitudinal section
  • FIG. 9 the dental implant system according to FIG. 8 in perspective section
  • FIG. 10 the dental implant system according to FIG. 1 in a perspective view in an exploded view
  • FIG. 11 a pre-assembled abutment ensemble of the dental implant system according to FIG. 8 in longitudinal section
  • FIG. 12 shows the distal end region of the abutment ensemble.
  • FIG. 11 in an enlarged longitudinal section in different states.
  • the abutment part 1 according to Figs. 1 - 3 is intended for use in a multi-part, in particular two-part, dental implant system not shown in detail in Figs. 1 - 3.
  • the abutment part 1 is placed on the actual dental implant, also referred to as the "post part", which is screwed into the patient's jawbone, in the manner of a connecting or transition piece.
  • a support surface 2 that acts as a superstructure and onto which the prosthetic or crown intended as a dental replacement can be attached
  • a connecting pin 4 via which a connection is made to the inserted post part, which can also withstand the expected high force and moment loads, in particular the chewing forces.
  • the connecting pin 4 can be inserted into a corresponding receiving channel of the post part and tapers continuously in the direction of its distal end 6, at least in sections, so that a contact surface 8 is created for the connection to the post part.
  • the most common implant systems with abutments of this type are currently mostly made of titanium or a titanium alloy and are designed as two-part implants of the type described above.
  • the abutments are usually provided with a rotational locking mechanism, known as an index, which is intended to ensure the correct rotational alignment of the abutment - and with it the prosthetics - relative to the post part - and with it the patient's oral cavity.
  • an index a rotational locking mechanism
  • the aim is to manufacture, for example, the support surface 2 of a structural part 1 from an alternative material, in particular a ceramic material.
  • an alternative material in particular a ceramic material.
  • such a choice of material brings with it other disadvantages, in particular due to the comparatively poor processability of ceramics, so that such implants have not been able to prevail.
  • the abutment part 1 is designed to provide a reliable index when connecting to the post part even when a ceramic base material is used.
  • the abutment part 1 is designed in two parts and comprises an abutment body 10 as the first abutment part and an index element 12 as the second abutment part. These two components are designed to be functionally separate from one another, with the abutment body 10, in accordance with the above-mentioned aim, being made of a ceramic, in the embodiment of a Zirconium oxide ceramic, and is designed in the manner of a conventional abutment for establishing the connection with the post part by means of the molded-on connecting pin 6 and for transmitting the above-mentioned comparatively large forces via the contact surface 8.
  • the indexing ie ensuring the correct rotational alignment of the abutment part 1 relative to the post part, is provided via the index element 12 which is also provided.
  • the indexing is carried out via the spatial shape of the index element 12.
  • This comprises an inner ring 14 as a central element, on the outside of which a number of axially extending positioning ribs 16 are formed as indexing elements.
  • these positioning ribs 16 are each inserted into corresponding grooves in the receiving channel provided as indexing elements, so that on the one hand a rotary locking mechanism is created, while on the other hand the insertion can only take place in a limited number of rotary positioning options.
  • the two-part design of the abutment part 1 makes it possible to provide a comparatively break-resistant and thus long-lasting concept despite the use of ceramic as the base material for the abutment body 10, since the areas that are particularly at risk of breakage due to the brittleness of the material and the limited space in the index area can be made of a different material.
  • it is intended to manufacture the index element 12 from a material that is significantly more flexible and deformable than the abutment body 10, in particular by having an E-modulus of at most 60% of the E-modulus of the material forming the abutment body 10.
  • the abutment body 10 is thus made of a ceramic material, in particular of a zirconium oxide ceramic, such as an aluminum oxide-reinforced zirconium oxide ceramic or a mixed ceramic or a ceramic mixture with a high proportion of zirconium oxide and/or aluminum oxide. It therefore has an E-modulus of approximately 210 GPa.
  • the index element 12 is made of a plastic, in particular PPS, fiber-reinforced PPS, PEEK or fiber-reinforced PEEK, and thus has an E-modulus of less than 10 GPa, in the case of fiber-reinforced PEEK approximately 59 GPa.
  • the geometric relationships of these components relative to one another are also suitably selected.
  • the index element 12 is limited in its extension in the longitudinal direction essentially to the end region of the structural part; according to one aspect of the invention, the length ratio between the index element 12 provided for indexing on the one hand and the connecting pin 4, which is in particular conical and is provided for the transmission of forces and moments, is suitably selected.
  • the index element 12 has a length of approximately 1.25 mm, whereas the connecting pin 4 has a length of approximately 3.5 mm. This satisfies the criterion provided in one aspect of the invention that the index element 12 should have a length of at most 50%, preferably a maximum of 33%, of the length of the connecting pin 4.
  • the coupling system 18 is designed as a mechanical connection system, although in principle, material-locking connections such as cementing or gluing would of course also be conceivable. In the event of a component breakage or the like, which, due to the choice of material, is more likely to affect the index element 12 than the abutment body 10, it can be important that the index element 12 can be replaced or exchanged quickly and easily.
  • the mechanical design of the coupling system 18 therefore has the advantage that if the index element 12 needs to be replaced, no adhesive and/or cement residues remain on the abutment body 10 that would have to be removed at great expense.
  • the coupling system 18 provided for connecting the abutment body 10 and the index element 12 is designed according to the model of a claw coupling 20 or pin coupling 22, as shown by way of example in FIGS. 4 and 5 in different representations.
  • a claw coupling 20 essentially comprises two coupling elements 24, each of which comprises a base disk 28 attached to an axle or shaft 26.
  • a number of coupling pins 30 or claws are arranged on this in an eccentric position aligned axially with the shaft 26, i.e. in the peripheral region of the respective base disk 28. This is clearly visible in the separated state of the claw coupling 18 shown in FIG. 4a.
  • the base discs 28 are engaged so that, as shown in FIG. 4b, the coupling pins 30 of both Coupling elements 24 alternately engage with one another and this creates a positive connection between the coupling elements 24 as seen in the direction of rotation of the shafts 26.
  • the claw coupling 18 thus forms a rotary locking mechanism between the coupling elements 24; these are thus positioned to transmit a torque between the shafts 26.
  • a pin coupling 22, as shown by way of example in FIG. 5, is based on a similar operating principle. As can be clearly seen in the separate illustration of the components in FIG. 5a and in the separated state as shown in FIG. 5b, it comprises a first, "male" coupling element 32 with a carrier ring 34, on which a number of coupling pins 30 are arranged eccentrically, i.e. offset from the central axis of the shaft 26, in a position axially aligned with the shaft 26.
  • the pin coupling 22 comprises a second, "female" coupling element 36 with a base ring 38, which has in its end face 40 a number of shaped recesses 42 which are adapted in their positioning and dimensioning to the coupling pins 30 and are also arranged eccentrically to the central axis of the shaft 26.
  • the coupling pins 30 are introduced into the mold recesses 42, so that a positive connection and thus a rotary locking mechanism is created between the coupling elements 32, 36 in the direction of rotation and the transmission of a torque becomes possible.
  • the coupling system 18 of the structural part 1 shown in Figs. 1 - 3 is designed based on these basic designs.
  • a number of coupling pins or pins 44 are arranged on the index element 12 off-center with respect to the longitudinal axis of the system.
  • the abutment body 10 has a number of associated mold recesses 46, in the exemplary embodiment four, at its distal end 6, into which the pins 44 can engage when the components are assembled. In this assembled state, the pins 44 are positively connected to the mold recesses 46 in the direction of rotation, thus creating a rotary locking mechanism.
  • the coupling system 18 is also designed so that in addition to the aforementioned rotational position fixation after connecting the components, i.e. after inserting or pushing in the finger-like pins or Pins 44 in the associated mold recesses 46, the two components can no longer be easily separated from one another, in particular without targeted intervention by the user.
  • the pins 44 in combination with the associated mold recesses 46 are designed as locking or snap connections.
  • the respective mold recess 46 initially has a widening from the apical towards the distal end 6, which tapers again towards the distal end 6 and thus forms an undercut or retention for the adapted shaped pin 44 on the index element.
  • This shape of the mold recesses 46 can be clearly seen in the enlarged view in FIG. 6.
  • the pins have a thickening 50 in a central region 48 as seen in the longitudinal direction, as can be clearly seen in the enlarged view in FIG. 7. With this thickening 50, the respective pin 44 can then snap into the associated mold recess 46.
  • This snapping is also facilitated by the choice of material for the index element 12 in a manner considered to be inventive, because the use of a plastic or a material with a sufficiently low modulus of elasticity requires a certain deformability and elasticity of the pins 44, so that they can be introduced into the mold recesses 46.
  • the shape of the mold recesses 46 is also selected to be particularly simple to manufacture with regard to possible manufacturing methods and with regard to large quantities. For manufacturing reasons, it is particularly advantageous to make the mold recesses 46 in the abutment body 10 in the green or white state. Comparatively simple geometries that can be produced with rotating tools are particularly suitable here, since other abrasive techniques, such as punching, are known to have a tendency to chipping or cracking even in the green or white state. For this reason, according to one aspect of the invention, and as can be clearly seen in the enlarged illustration in FIG. 6, the respective mold recess 46 is basically designed as a round hole.
  • the mold recess 46 has an essentially circular basic shape 52 in a side view.
  • the insertion opening 54 which is necessary for the connection with the pin 44 and is superimposed on the circular basic shape 52, can then be produced as a geometric entrance into this hole in advance or afterwards, e.g. with a cutting disc.
  • this entrance or the insertion opening 54 is conical from the "open" side, i.e. from the distal end 6, so that the respective pin 44 of the index element 12 can be deformed comparatively slowly and thus in a way that protects the material when inserted.
  • the thickening 50 of the respective If the pin 44 is located in the round part of the respective mold recess 46, the material of the pin 44 can reset itself and thus prevent the index element 12 from falling out.
  • a dental implant system 60 which is also considered to be independently inventive, with a mounting part 1 of the type described above is shown in different views in Figs. 8 - 10.
  • the mounting part 1 comprises a post part 62 which is screwed into the patient's jawbone and onto which the mounting part 1 is placed in the manner of a connecting or transition piece.
  • the post part 62 has a receiving channel 64 which comprises an internal index 68 adapted to the index element 12 in an indexing area 66.
  • the index 68 comprises in particular a number of axial grooves 70, four in the exemplary embodiment, each provided for receiving one of the positioning ribs 16.
  • the connecting pin 4 is inserted into the receiving channel 64, each of the positioning ribs 16 is thus inserted into one of the axial grooves 70, so that a rotary locking mechanism is created between the structural part 1 and the post part 62.
  • a connecting screw 72 is provided, which engages with an external thread 74 provided at the end into an internal thread 76 in the receiving channel 64 of the post part 62, and whose screw head 78 comes to rest on a screw seat 80 in the abutment body 10.
  • the dental implant system 60 is equipped with a specific safety concept with regard to the design and dimensioning of its components, which is intended to prevent unintentional damage to the components as a result of inadequate alignment. Damage to the components is to be prevented in the event that the index element 12 is not (yet) aligned in the correct rotational insertion direction relative to the post part 62 and the connecting screw 72 is tightened.
  • the system components mentioned are coordinated with one another in terms of their dimensions in such a way that the connecting screw 72 cannot engage in the associated internal thread 76 in the post part 62 or can be screwed into it if the positioning ribs 16 of the index element 12 are not at least partially inserted into the associated axial grooves 70 in the post part 62.
  • the components of the dental implant system 60 are designed in such a way that an abutment ensemble 90 suitable for final assembly on the post part can be prefabricated in the manner of a pre-assembly, consisting of the abutment body 10, index element 12 (which together form the abutment part 1) and the connecting screw 72, and can be stored for a longer period of time if necessary.
  • a pre-assembled abutment ensemble 90 is shown in longitudinal section in FIG. 11. In the case of use or treatment, i.e. when the abutment is to be placed on the post part 62 in the patient's mouth, this can be achieved particularly easily and in particular with particularly short treatment times for the patient.
  • a pre-assembled abutment ensemble 90 all that is then required is to tighten the connecting screw 72 in the post part 62.
  • the connecting screw 72 should be secured against accidentally falling out of the screw channel 92 in the abutment body 10. According to one aspect of the invention, this is achieved in a particularly simple manner by a suitable selection of the geometry and parameters of the components.
  • the index element 12 is equipped on the inside with a retaining bead 94, the clear width of which is slightly smaller than the outer diameter of the external thread 74 of the connecting screw 72.
  • the connecting screw 72 is then screwed in, whereby the external thread 74 engages with the retaining bead 94 due to the choice of material and deformability of the index element 12.
  • the connecting screw 72 can thus be "screwed through” the retaining bead 94, so that the external thread 74 is then located beyond the retaining bead 94.
  • FIG. 12b This state is shown in FIG. 12b.
  • FIG. 12c it is no longer possible to pull the connecting screw 72 back over the retaining bead 94 without screwing.
  • the screw head 78 prevents further movement of the connecting screw; this is thus fixed in the screw channel 92 and secured against accidental falling out.
  • the minimum centric passage of the screw channel 92 given by the clear width of the retaining bead 94, lies in its diameter between the nominal thread diameter of the external thread 74 and an axially adjacent, reduced-diameter area 96 of the screw shaft 98.
  • the connecting screw 72 can be inserted into the index element 12 without a thread is specifically provided, screw through the index element 12 and is then caught in it so that it can no longer fall out.
  • Base disc Coupling pin Coupling element Carrier ring Coupling element Base ring Face recess Pin Recesses Area Thickening Basic shape

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un élément de structure (1) destiné à être utilisé dans un système d'implant dentaire (60), comprenant un corps de butée (10) qui comporte un tourillon de liaison (4) pouvant être inséré dans un canal de réception (64) correspondant d'un élément montant (62) et se rétrécissant de manière continue au moins dans certaines régions en direction de son extrémité distale (6). L'objectif de l'invention est de pouvoir fournir un implant qui soit particulièrement fiable et résistant à la rupture, même en cas d'utilisation de matériaux céramiques de base. À cet effet, la pièce de structure (1) est réalisée selon l'invention de manière à comporter deux ou plus de deux parties et comprend, en plus du corps de butée (10), un élément d'indexation (12) qui est constitué d'un matériau qui présente un module d'élasticité égal à au maximum 60 % du module d'élasticité du matériau formant le corps de butée (10) et qui est disposé sans rotation à l'extrémité distale de son tourillon de liaison (4).
PCT/EP2023/079604 2022-10-27 2023-10-24 Élément de structure pour un système d'implant dentaire et système d'implant dentaire comprenant un tel élément de structure WO2024089018A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022128589.8A DE102022128589A1 (de) 2022-10-27 2022-10-27 Aufbauteil für ein Dentalimplantat-System und Dentalimplantat-System mit einem solchen Aufbauteil
DE102022128589.8 2022-10-27

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WO2024089018A1 true WO2024089018A1 (fr) 2024-05-02

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PCT/EP2023/079604 WO2024089018A1 (fr) 2022-10-27 2023-10-24 Élément de structure pour un système d'implant dentaire et système d'implant dentaire comprenant un tel élément de structure

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WO (1) WO2024089018A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010046153A (ja) * 2008-08-19 2010-03-04 Nanto Precision Co Ltd 歯科用インプラント
US20100062395A1 (en) * 2007-03-15 2010-03-11 A.B. Dental Devices Ltd. Device providing an interface between a dental implant and an abutment
WO2012065718A1 (fr) 2010-11-15 2012-05-24 Holger Zipprich Système d'implant dentaire et procédé pour la fabrication d'un système d'implant dentaire

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009057754B4 (de) 2009-12-10 2016-01-21 Cera M Gmbh Zahnimplantat
EP2618774B1 (fr) 2010-09-23 2017-11-15 Biomet 3i, LLC Butée dentaire
LU92312B1 (en) 2013-11-20 2015-05-21 Dentaire Hornbeck Jacques Sarl Lab Dental implant
DE102016215427A1 (de) 2016-08-17 2018-02-22 Holger Zipprich Dental-Prothetiksystem und prothetische Konstruktion zur Verwendung mit einem in den Kieferknochen eines Patienten inserierten Dentalimplantat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100062395A1 (en) * 2007-03-15 2010-03-11 A.B. Dental Devices Ltd. Device providing an interface between a dental implant and an abutment
JP2010046153A (ja) * 2008-08-19 2010-03-04 Nanto Precision Co Ltd 歯科用インプラント
WO2012065718A1 (fr) 2010-11-15 2012-05-24 Holger Zipprich Système d'implant dentaire et procédé pour la fabrication d'un système d'implant dentaire

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