ENOSSALES DENTAL IMPLANT

Description

[0001] The invention relates to an endosseous dental implant with an interface in the cervical region for receiving an abutment, a rotationally symmetrical implant core, with a thread that extends from the cervical to an opposite apical region, wherein the diameter of the implant core decreases in the direction of the apical region, furthermore the thread has a constant outer diameter in a first section and a tapered outer diameter in a second, apically oriented section, the thread has recesses, cutting grooves and / or cutting edges and the implant core is rounded at the apical end according to the preamble of claim 1.

[0002] An endosseous single-tooth implant for a fixed dental prosthesis is previously known from EP 2 787 920 B1. This known dental implant consists of a substantially cylindrical base body insertable into a bore in a jawbone, having an annular recess and a form-fitting portion, as well as a bore open toward its coronal end and arranged cervically to the recess. The bore has a threaded portion arranged at the cervical end in the base body for securing a retaining screw.

[0003] An abutment with a form-fitting section can be inserted into the recess of the base body. Furthermore, a hole for a retaining screw and a fastening head for the denture are provided. The retaining screw is inserted into a blind hole in the base body.

[0004] The implant body has a shape that tapers towards the apical area and has an external thread in the form of a single-start cutting thread with cutting edges that interrupt the individual thread turns in the axial direction.

[0005] The dental implant according to WO 2014 / 026706 A1 has an implant body with an external thread for anchoring the implant in a jawbone. Cutting grooves are arranged in the external thread. The known dental implant has a coronal end, from which a hollow space extends in sections to the apical end.

[0006] The cavity includes a conical section, an anti-rotation section, and an internal thread. A secondary component can be at least partially accommodated in the dental implant cavity.

[0007] The dental implant has a cylindrical area between the coronal end and the area with external thread.

[0008] The previously known external thread is designed as a single-start thread and has two circumferential ridges between adjacent thread flanks, which run essentially parallel to the thread flanks of the external thread. This creates three grooves between two adjacent thread flanks. A so-called coronal region is essentially cylindrical. An apical region tapers towards the apical end. At the apical end, the apical region is designed as a blunt section.

[0009] Starting from the coronal end, the dental implant cavity has a conical section towards the apical end and has the aforementioned anti-rotation section with internal thread.

[0010] The conical section with internal thread serves to accommodate the secondary component with an abutment body. The dental implant and the secondary component are pre-assembled using an abutment screw and form a set.

[0011] EP 3 235 456 B1 discloses an implant having a prosthetic interface in the cervical region and an implant core and at least one thread extending from the cervical region to an opposite apical region.

[0012] The outer diameter of the core decreases in the apical direction, while the outer diameter of the thread remains constant in a first cylindrical section.

[0013] The outer diameter of the thread decreases in a second tapered section, also in the apical area.

[0014] The rate of decrease of the outer diameter of the thread in its tapered section is greater than the rate of decrease of the diameter of the core.

[0015] The width of the thread in each section varies.

[0016] Furthermore, the thread has hemispherical cavities with cutting edges that are spaced along the entire length.

[0017] In a further development, the implant can have two opposing, i.e. counter-rotating threads.

[0018] The implant is rounded at the apical end.

[0019] The prosthetic interface may include a connecting piece and have an anti-twist device in the form of a polygon.

[0020] The dental implant according to CN 208371937 U has an implant body with a continuous thread. Circular recesses are formed on the implant core to promote the penetration of newly formed bone.

[0021] WO 2020 / 074647 A1 discloses an implant according to the preamble of claim 1.

[0022] The well-known two-piece endosseous dental implants described above represent an exemplary, non-exhaustive representation of the designs currently available on the market. All comparable implant systems result in more or less noticeable crestal bone loss. In general, the various endosseous implant systems show a good to excellent long-term prognosis for various indications.

[0023] The crestal bone is the most coronal or marginal portion of the peri-implant bone. Assessing the bone conditions around an implant is essential for analyzing the long-term prognosis. Changes in the coronal portion of the bone bed, in the sense of bone resorption, are an important parameter for this and are considered a pathological sign that can progress to implant loss.

[0024] The causes of crestal bone loss are not fully understood or fully clarified. One possible cause is the positioning of the implants or implant shoulders and the transition from a smooth to a rough implant surface. Biomechanical overloading of the bone can also lead to undesirable bone loss.

[0025] From the above, it is therefore an object of the invention to provide a further developed endosseous dental implant with an interface in the cervical region for receiving an abutment, which starts from a rotationally symmetrical implant core with a cutting thread, whereby a significant increase in the bone coverage rate in the crucial crestal bone is to be created, so that the long-term prognosis is significantly improved when using the implants according to the invention.

[0026] In addition, the basic configuration of the implant should be suitable for forming ultrashort, miniaturized implants.

[0027] The object of the invention is achieved by the endosseous dental implant according to the combination of features according to patent claim 1, wherein the subclaims comprise at least expedient embodiments and further developments.

[0028] It is therefore assumed that there is an endosseous dental implant with an interface in the cervical region.

[0029] The interface is used to accommodate an abutment.

[0030] The dental implant has a rotationally symmetrical implant core with a thread that extends as an external thread from the cervical to an opposite apical area.

[0031] The diameter of the implant core decreases towards the apical area.

[0032] The thread further has a constant outer diameter in a first section and a tapered outer diameter in a second, apically oriented section.

[0033] The thread has recesses, cutting edges, and / or cutting grooves. The implant core is rounded at its apical end and therefore has a convex shape.

[0034] According to the invention, the thread is designed as a main thread and a cervically adjoining, multi-start, left-right counter-rotating micro-fine thread.

[0035] The diameter of the micro-fine thread is smaller than the diameter of the immediately adjacent section of the main thread.

[0036] In a preferred embodiment, the main thread has two starts and the micro-fine thread has five starts.

[0037] The abutment interface is designed as a blind core hole with an implant shoulder.

[0038] In the area of ​​the transition from the blind core drilling to the implant shoulder, an inner cone or an outer cone can be formed.

[0039] A flat surface may be provided in the area of ​​the interface transition.

[0040] The blind core hole has an internal thread for creating the implant-abutment connection.

[0041] The main thread is self-tapping.

[0042] In a preferred development of the invention, a transition region between the main thread and the micro-fine thread is provided, in which the threads overlap, wherein micro-fine thread grooves or micro-fine thread sections are provided on sections of thread flanks of the main thread.

[0043] In a preferred embodiment, the connection between the implant core and the abutment is realized in two parts.

[0044] The design of the implant neck ensures a tension-free fit in the crestal bone while maximizing cortical bone preservation. This reduces the need for bone augmentation after implant placement.

[0045] The micro-grooves or micro-fine threads used serve on the one hand to enlarge the implant surface and on the other hand to ensure an increased bone coverage rate in the crucial crestal bone.

[0046] A multiple formation of three cutting grooves in the main thread serves to improve insertion during incision and is suitable for all bone classes.

[0047] The rounded implant tip, i.e. the convex shape, reduces the risk of injury, for example to the sinus membrane.

[0048] A groove-cam solution can be used for the implant-abutment connection, which has proven to be more rotationally stable than polygon profiles or polygonal positioning index designs.

[0049] The invention will be explained in more detail below using exemplary embodiments and with the aid of figures. Fig. 5 an implant which is according to the invention.

[0050] Here we show: Fig. 1 shows an exemplary representation of a mini-implant with exemplary, non-limiting dimensions; Fig. 2a - c show exemplary representations of implants with fixed abutments and a longitudinal section ( Fig. 2c ); Fig. 3 a photorealistic representation in partially cutaway form of an implant similar to the representations according to the Figure 2a - c; Fig. 4 a photorealistic, partially broken away representation of an implant according to the invention with an inner cone in the annular implant end; and Fig. 5 a photorealistic representation of an implant analogous to the representation according to Fig. 1 .

[0051] The implants shown in the figures are used as endosseous dental implants and have an interface in the cervical area to accommodate an abutment.

[0052] The implant core 1 is according to Figure 1 (Sectional view) is rotationally symmetrical and has a thread 2 that extends from a cervical region 3 to an apical region 4.

[0053] In the cervical area there is a receptacle for a Figure 1 abutment not shown.

[0054] The diameter of the implant core 1 decreases towards the apical region 4.

[0055] The thread 2 has a constant outer diameter in a first section 5 and a tapered outer diameter in a second section 6, which is oriented apically.

[0056] The thread has recesses, cutting grooves or cutting edges as shown in the figures, resulting in a self-tapping thread.

[0057] The implant core 1 is rounded at its apical end 7.

[0058] As can be seen from the figures, the thread 2 is designed as a continuous main thread and a cervically adjoining, multi-start left-right counter-rotating micro-fine thread 8.

[0059] The diameter of the micro-fine thread 8 is smaller than the diameter of the immediately adjacent section of the main thread 2, which can be seen from the exemplary diameter specifications according to Figure 1 can be traced.

[0060] In a preferred embodiment, the main thread 2 is two-start and the micro-fine thread 8 is five-start.

[0061] The interface for receiving the abutment has a blind core hole 9 with implant shoulder 10.

[0062] In the area of ​​the transition from the core hole 9 to the implant shoulder 10, as shown in the Figure 4 shown, an inner cone 11 must be present.

[0063] However, it is also possible to design an outer cone 12 on the outer diameter in the area of ​​the implant head below the implant shoulder 10, i.e. in the apical direction, which is advantageous for miniaturized implants.

[0064] Furthermore, a flat surface 13 can be formed in the transition area as a flat support for the flexible accommodation of different abutments.

[0065] The blind core hole 9 has an internal thread 14 for the implant-abutment connection, which can be seen from the illustrations according to Figure 2a - c results.

[0066] In this regard, the abutment consists of an outer part 15 with an internal screw connection 16, wherein the internal screw connection 16 has an external thread that is compatible with the internal thread 14 in the blind core bore 9.

[0067] In the transition area from main thread 2 to micro-fine thread 8, the two aforementioned threads overlap. Micro-fine thread grooves 21 are provided on sections of thread flanks 20 of main thread 2.

[0068] The representation according to Figure 4 shows cutting grooves or cutting edges 22 and surface-enlarging recesses 23 in the implant core 1.

[0069] The reduced-diameter design of the implant neck in the area of ​​the microfine thread 8 ensures a tension-free fit in the crestal bone while maximizing its preservation. This reduces the need for bone augmentation.

[0070] The microgrooves or microthread 8 enlarges the implant surface and ensures an increased bone coverage rate in the crestal bone.

Claims

1. Endosseous dental implant with an interface in the cervical area for receiving an abutment (15; 16), a rotationally symmetrical implant core (1) with a thread (2) that extends from the cervical area to an opposite apical area (4), wherein the diameter of the implant core (1) decreases in the direction of the apical area (4), moreover the thread (2) has a constant outer diameter in a first section (5) and a tapered outer diameter in a second, apically orientated section (6), the thread has cutting grooves and / or cutting edges (22), and the implant core (1) is rounded at the apical end (7), wherein the thread (2) is designed as a continuous main and cervically adjoining micro-fine thread (8), wherein the diameter of the micro-fine thread (8) is smaller than the diameter of the immediately adjoining section of the main thread (2) characterized in that the micro-fine thread (8) is designed as a multi-start, left-right counter-directional thread having three to six, preferably five starts, and circular, surface enlarging recesses (23) are formed in the implant core (1) .

2. Endosseous dental implant according to Claim 1, characterized in that the main thread (2) is constructed with two starts.

3. Endosseous dental implant according to Claim 1 or 2, characterized in that the interface is designed as a blind hole core bore (9) with implant shoulder (10), wherein an inside taper (11) is provided in the area of the transition from the core bore (9) to the implant shoulder (10).

4. Endosseous dental implant according to Claim 3, characterized in that a plane surface (13) is formed in the area of the transition.

5. Endosseous dental implant according to any one of the preceding claims, characterized in that the main thread (2) is self-tapping.