BG1911U1 - Screw implant to jawbone with coronal and apical self-threading - Google Patents

Abstract

The utility model refers to the screw implant (1) jawbone with coronal compression thread (4) threaded spirals (11a-11j) and apical self-threading groove (6) with the threaded spirals (16a, 16b) whose steps threaded (10, 15) are the same as the coronal chapter of the implant (2) apical in the final position, at least in chancellors bone tissue is incorporated compression thread (4) to which apical in the final position in the maxilla-bone tissue was incorporated to self-threading groove (6) as both the inner and the outer diameter of the compression thread (4) at least in its apical cone of coronal in thins the apical direction. The axial length of the threaded compression (4) is from 2.5 to 1.875 multiples of the axial length of the self-threading groove (6), respectively, from 1.5 to 1.125 multiples of the axial length of the self-threading groove (6), and that the radial depth (14) of self-threading groove (6) is greater than the radial depth (9) on the threaded compression (4) in the apical area, preferably from 1.875 times up to 1,125 time sand that the angle of the taper (Beta) on threaded spirals (11a-11j) of compression thread (4) is greater than the angle of the taper (Alpha) on threaded spirals (16a, 16b) of self-threading groove (6), preferably from 1.875 times up to 1,125 times.

Description

Field of technology

The utility model refers to a screw implant for the jawbone with coronal compression and apical self-tapping thread.

BACKGROUND OF THE INVENTION

DE 3918309 C2 and EP 0320740 B1 from Bauer / Baieg (Bauer KSI) indicate a screw implant for the jawbone with a compression thread, the core and the shell of which are tapered conically in the direction from the coronal to the apical end, and the core is between the coils with concave shape. Thanks to the concave turns of the thread, the bone tissue between them is preserved. In this way, the implant is inserted into the cancellous bone by successive radial compression of the bone tissue during the winding of the conical screw implant, and the masticatory load of the implant immediately after implantation is relatively good, without waiting for the healing period. DE 3918309 C2 further discloses that the ratio between the conical angle of the outer envelope cone and the cone of the core varies between 1,177 and 1,666.

DE 202011001474 U1 of Biomed / Biomed presents a screw implant for the jawbone, which has one or two self-tapping threads, which after winding the implant are located in the distal or possibly in the promixed jawbone. Thanks to the radial, relatively deep turns of the thread, the implant is fixed mainly in the jawbone by axially connecting the geometric shapes of the thread. In this case, a certain healing period must be waited for before being heavily loaded by chewing, after which, however, the implant will bear a heavier load than the aforementioned Bauer / Vaieg implant.

DE 10251469 A1 of Brasseler GmbH (German: Brasseler GmbH) presents a screw implant for the jawbone with three different threaded sections in the jawbone area, the apical threaded section with a large depth of thread with oblique ends, the middle threaded the section has a conical core and a cylindrical characteristic of the surface shell, and the coronal threaded section has a trapezoidal thread with a small depth. The three threaded sections are almost identical in length.

DE 202007004943 U1 of Champions-Implants GmbH presents a screw implant for the jawbone with two different threaded sections in the jaw-bone area, the apical threaded section being a self-tapping root compression thread and the coronal is a root micro-thread, with both cones tapering towards the apical end.

U.S. Pat. No. 5,588,838 A to Hansson and Holmen discloses a screw implant for the jawbone with two different threaded portions in the jawbone area, the apical threaded portion being a self-cutting cylindrical self-tapping thread and the coronal threaded microthread that tapers to the apical end.

DE 69017349 T2 (= EP 0424734 B1) of Bpecna / Vrespa presents a screw implant for the jawbone is two or three different threaded sections in the jawbone area, the apical threaded section is a self-cutting root-shaped self-tapping triangular thread, the middle conical, and in its outer diameter - with a cylindrical trapezoidal thread, and the coronal threaded section is again a self-cutting cylindrical cortical thread.

DE 10356920 B4 of Lippe presents a screw implant for the jawbone with three different threaded sections in the jawbone area, the apical end of the thread being a self-cutting cylindrical self-tapping thread, the middle threaded section being a non-cutting cylindrical self-tapping compression, cylindrical cortical thread, and between it and the compression thread as well as between the compression thread and the apical self-tapping thread there is a gradation in the size of the diameter.

Lippe EP 1527749 A2 indicates a screw implant very similar to DE 10356920 B4, but there are no screws between the threaded sections.

1911 UI degrees provided. The inner and outer diameters of the self-tapping and compression threads can also be arranged conically relative to the tip.

In all of the above screw implants immediately after implantation and after a certain healing period, more or less good resistance is found in the jaw area, but there are always cases of chewing overload to loosen or even tear the screw implant. In addition, the winding forces of the cylindrical or slightly conical compression threads are relatively large, so that there is a risk of breakage in the area of the smallest diameter, for example in the neck area between the coronal area and the first threaded area or immediately in front of the apical one.

Technical essence of the utility model

The task of the utility model is to eliminate such shortcomings and improve the screw implant of the respective variety, starting from the above stage of technical development according to EP 1527749 A2 so as to reduce the likelihood of development, to increase the masticatory load, as immediately after implantation. and after a certain recovery period and this period to be shortened.

The features of the independent claim 1 serve to solve the problem, and the suitable improvements are the subject of the other claims. The essential thing in this case is that the axial length of the compression thread corresponds at least twice +/- 25% of the axial length of the self-tapping thread and that the radial depth of the self-tapping thread is greater than the depth of the compression thread 4, preferably 1, 5 times +/- 25%, and that the sharpening angle of the threaded spirals of the compression thread is greater than the sharpening angle of the threaded spirals of the self-tapping thread, preferably 1.5 times +/- 25%.

Screw implant 1 for jawbone with coronal compression thread 4 with threaded spirals 1 la-1 lj and apical self-tapping thread 6 with threaded spirals 16a, 16b, whose thread steps 10, 15 are the same as to the coronal head of implant 2 apically in final position at least in the spongy bone tissue is attached to the compression thread 4, to which apically in the final position in the jawbone tissue is attached the self-tapping thread 6, as both the inner and outer diameters of the compression thread 4 at least in the apical part conical from coronal to apical direction. The axial length 10 of the compression thread 4 corresponds to 2.5 to 1,875 times the axial length of the self-tapping thread 6, respectively to 1.5 to 1,125 times the axial length of the self-tapping thread 6 and the radial depth 15 14 of the self-tapping thread is greater than the radial depth 9 of the compression thread in the apical portion 4, preferably from 1,875 times to 1,125 times, and the sharpening angle (beta) of the threaded spirals 1 la20 1 lj of the compression thread 4 is greater than the sharpening angle (alpha) ) of the threaded spirals 16a, 16b of the self-tapping thread 6, preferably from 1,875 times to 1,125 times. The maximum outer diameter of the compression thread 25 of the screw implant is equal to or smaller than that of the self-tapping thread 6, preferably from 1.32 to 2.20 times, resp. from 1.08 to 1.8 times. The maximum outer diameter of the compression thread 4 of the 30 screw implant in the fastening section is larger than that of the self-tapping thread 6, preferably from 1.32 to 2.20 times, resp. from 1.08 to 1.8 times, the inner and / or outer diameter of the self-tapping thread 6 of the screw 35 implant at least in its apical portion tapers conically from the coronal to the apical direction. The inner and / or outer diameter of the self-tapping thread 6 of the screw implant in its coronal region tapers conically from the coronal to the apical direction. The minimum inner diameter of the compression thread 4 is approximately equal to +/- 10% of the maximum inner diameter of the self-tapping thread 6. The conical angles of the inner and outer 45 diameters of the compression thread 4 and the self-tapping thread 6 are the same and vary more. specifically from 3.85 ° to 3.15 ° and from 5.5 ° to 4.5 °. The conical angles of the inner and outer diameters of the compression thread 4 are equal to 50 and vary in particular from 6.25 ° to 3.75 ° and that

1911 UI the conical angles of the inner and outer diameters of the self-tapping thread 6 are the same and are in particular from 4.375 ° to 2.625 °. Between the turns 1 la-1 lj of the compression thread 4 there is a circumferential recess 12 with a diameter of 0.9375 mm to 0.5625 mm. Between the windings 16a, 16b of the self-tapping thread 6 there is a circular recess 17 with a diameter of 2.1875 mm to 1.3125 mm. Also, the surface of the compression thread 4 is rough and the surface of the self-tapping thread 6 is smoothed. Between the neck of the implant 3 and the compression thread 4, another coronal self-tapping thread is provided, identical to, for example, the apical self-tapping thread 6. Between the compression thread 4 and the self-tapping thread 6 there is a non-threaded section formed cylindrically or conically. . the same angle of the cone as a section before and after it. In the case of a set of screw implants 1 the axial lengths of the self-tapping thread 6 of all screw implants 1 of the set are always the same and are 1.5 mm - 4 mm, and that the axial lengths of the compression thread 4 of all screw implants 1 of the set differ stepwise with a minimum of 2 mm and are in the range of approx. 4 mm and 20 mm. At the top of the compression thread, the thread is shaped like micro-threads or has circular micro-channels. In at least one part of the microthread resp. of the microchannels have the same surface. The jawbone body of the implant is screwed or glued to the abutment.

This achieves the advantage of using both generally known methods of anchor reinforcement of screw implants, on the one hand by forcibly sealing the cancellous bone tissue through the compression thread, and on the other hand by connecting the geometric shapes of the threads in the cortical bone tissue. by means of the self-tapping self-tapping thread. Therefore, the bone tissue that will be compacted by the compression thread is first cut by the self-tapping thread and then compressed. In this way, better compression is achieved with a weaker winding force. After penetrating the spongy bone tissue, the self-tapping thread is located at the opposite cortical end. It achieves easy anchoring thanks to the excellent cutting properties of the apical self-tapping thread.

The advantage of the feature is that the axial length of the compression thread corresponds to almost twice +/- 25% of the axial length of the self-tapping thread, that the compression thread is completely covered by the spongy bone tissue and the self-tapping thread is completely covered by the bone. fabric, as a result of which an optimal combination between the force connection and the connection of the geometric shapes of the threads is provided. In this way, the implant becomes extremely stable and resistant to masticatory load immediately after implantation.

The advantage of the feature is that the maximum outer diameter of the compression thread is smaller than that of the self-tapping thread, preferably from 1.2 to 2 times resp. +/- 10% that when penetrating the self-tapping thread cuts the bone and touches the cortical end. The bone tissue cut by the self-tapping but still connected bone is subsequently compressed, stabilized and compacted again by the compression thread. This makes it easier to compress the bone tissue, so less manual effort is used when winding the implant. At least the self-tapping thread should be larger in diameter than the compression thread in the lower apical area. As a result, the difference in thread diameters reduces the likelihood of unscrewing.

The advantage of the feature is that the maximum outer diameter of the compression thread is larger than that of the self-tapping thread, preferably by 1.2 to 2 times, close to +/- 10%, that the winding of the implant is greatly facilitated without causing excessive injury, which reduces healing time. In addition, the bone tissue cut by the self-tapping thread but still connected at the periphery is subsequently compacted and stabilized by the compression thread. Therefore, the bone structure near the implant is repeatedly damaged, which (surprisingly) has a positive effect on the stability of the implant insofar as in a long time there will be no possibility of initial remodeling. Yes

The 1911 UI implant initially remained firmly anchored for a long time, i. the period from time to prosthetic splinting (via a bridge) is significantly extended. This is a great advantage, as the prosthetic service from dental laboratory 5 is no longer provided in a timely manner, as a result of which the risks of implant shaking increase.

The advantage of the feature is that the radial depth of the self-tapping thread is greater than the depth of the compression thread 4, preferably 1.5 times resp. +/- 25%, so that even during the implant winding, radial and vertical pre-compression of the cancellous bone tissue is performed through the self-tapping thread with a smooth surface, as a result of which significantly less compaction is compressed through the compression thread with a rough surface. spongy bone tissue, which greatly facilitates the implant winding.

The advantage of the feature is that the angle of sharpening of the threaded spirals of the compression thread is greater than the angle of sharpening of the threaded spirals of the compression thread, preferably 1.5 times resp. +/- 25% that in this way the self-tapping thread in the axial direction preserves the spongy bone tissue, which subsequently displaces the compression thread, as a result of which a strong axial connection of the geometric shapes of the threads is created.

Suitably between the windings of the compression thread, the construction of the implant is carved in a circular-concave shape, so as to achieve optimal radial compaction of the cancellous bone tissue. However, other concave shapes can be provided between the windings of the compression thread.

Successfully, the compression thread is coated and / or treated with a magnifying and roughening agent, which increases friction and improves blood adhesion. However, for hygienic reasons, the surface of the self-tapping thread is not rough, but preferably smoothed, in particular polished. This feature is particularly suitable because the implant according to the invention is usually selected so that the self-tapping thread is located at the opposite cortical end or slightly protrudes from it - for example in the jaw or nasal cavity.

Successfully, after implantation, the coronal portion of the compression thread is located in the coronal cortical bone tissue, as a result of which a certain, albeit small, radial compression can also be obtained in the coronal cortical bone tissue and thus improve the insertion. However, the entire compression thread can, after implantation, fall completely into the spongy bone tissue, so that the neck of the implant falls almost without targeting the coronal cortical bone tissue, as the main insertion is performed by compression thread in the spongy bone tissue. is threaded into the apical cortical bone tissue. Of course, an additional self-tapping thread, for example identical to the apical self-tapping thread, can be provided between the neck of the implant and the compression thread to obtain additional connection of the geometric shapes of the threads in the coronal cortical bone tissue.

Between the compression and the self-tapping thread, a non-threaded section, cylindrically or conically shaped and having the same diameter, resp. the same taper as the sections before and after it. This non-threaded section serves only for better fabrication of the implant, since in this way the two threaded sections are clearly delineated, two stages of fabrication can take place, in particular that for surface treatment. The surface of the compression thread should be as rough as possible, and that of the self-tapping thread - as smooth as possible.

In summary, the following can be stated:

In the area where the implant enters the jawbone, it has a compression thread to which rests a sharp self-tapping thread placed at the opposite cortical end. This sharp thread should not have superficial magnifications, as there is a possibility (this cannot be controlled by the surgeon) that the thread will be wound outside the opposite courts1911 UI muddy end, for example at the base of the nose or jaw cavity. It is not appropriate for the thread in this place to be rough, as these areas are hidden / non-sterile. There, rough components of the implant would support infections. 5

Rough elements in the bone lead to good adhesion in the bone.

Therefore, such an implant can be fixed in two completely different ways: in the root area - by lateral bone compression (which is a known method), and in the jaw area - by cortical anchor insertion. The advantage here is the extremely high initial stability and the use of both methods of implementation.

The implant presented here is made as a monolithic element with a head. However, the utility model is not limited to monolithic implants, standard implants can be implanted in the jaw and bone area.

Surprisingly, the narrow area between the threads with a diameter of 1.8 - 2.2 mm is enough to avoid tearing the implant - for example, during its placement it can break off.

In a particularly suitable sub-variant, the self-tapping thread is separated / separated from the compression thread (as they are connected to each other only at a relatively narrow point), and the thread windings of the self-tapping thread have an increasing diameter at both ends (upper and lower). ). In this case, the maximum diameter is in the middle of the thread. This construction is a particularly suitable form of implementation, as it prevents the development of the implant. Because when winding the thread, the cortical area is pushed out. It elastically returns as the threads go deeper and those with smaller diameters or thin joints are placed in the cortical area.

The utility model is explained in more detail below with the help of exemplary figures.

They show:

Figure 1: radial view of the screw implant according to the utility model;

figure 2: schematic representation of fig. 1;

figure 3: axial view of fig. 2 from the apical direction;

figure 4: axial view of fig. 2 from the coronal direction;

figure 5: enlarged image of fig. 1 in the area of the compression thread;

figure b: enlarged image of fig. 1 in the area of the self-tapping thread.

Figures 1 and 2 show a screw implant 1 according to the utility model, once as an actual general radial view (Fig. 1) and once as a schematic image (Fig. 2) with schematically marked threads 4 and 6 with their invisible and external shell outlines. Invisible outlines are also sketched in the head of implant 2.

Examples of implementation of the utility model

Attached to the coronal head of the implant 2 is the neck of the implant 3, in which rests the compression thread 4, followed by a transition zone 5, which ends in the self-tapping thread 6, which in turn reaches the tip of the implant7.

The cone-shaped head of the implant 2 according to FIG. 4 of its shell has three notches 8 respectively at 120 ° to each other for placing an outline denture or a support structure therefor. Here, the head of the implant 2 has an axis / axial length of 7.2 and a cone of about 10 ° between the outer diameter of 2.65 mm to 3.91 mm.

From the neck of the implant 3 in the apical direction, the screw implant 1 has a conical core, which is formed symmetrically in rotation with respect to the longitudinal axis A.

The next in the apical direction neck of implant 3 is narrowed between the head of implant 2 and the compression thread 4, it is here with a length of 3 mm, the diameter decreases from 3.91 mm of the head of implant 2 to 2.3 mm in the middle of the neck of implant 3 and again increases to 3.7 mm along the compression thread 4, the transitions being rounded.

The next in the apical direction compression thread 4 has an axis length of 15.2 mm and passes apically and conically pointed from an outer diameter of 3.7 mm to 2.5 mm, whereby the angle of the cone becomes approximately 4.92 °. The inner diameter of the compression thread 4 passes equivalently to the outer diameter and has a thread depth of about 0.52 mm, the thread pitch 10 being 1.5 mm (Fig.

1911 UI

5). Between the adjacent turns of the triangular thread 11a -11 j (Fig. 1) a circumferential recess 12 with a radial depth of 0.75 mm (calculated on the outer diameter) is provided, extending upwards to the tips 18a, 18b, respectively. where the average angle of sharpening is beta = approx. 60 °. In this way, the axial compression of the cancellous bone tissue is significantly improved. The tips 13a, 13b (Fig. 5) of the outer (enveloping) surface of the thread windings are rounded to 0.05 mm.

The next section in the apical direction, without a thread 5, is 1.5 mm long, the outer diameter being contracted rounded / rounded along the compression thread 4 from 2.5 mm to 1.5 mm.

The next self-tapping thread 6 in the apical direction is 3 mm long, the outer diameter of which increases from 1.5 mm to 3.55 mm, then shrinks in a section from 1.3 mm to 3.4 mm, and then again falls by 1.5 mm. The self-tapping thread 6 here has an angle of a thinning cone in the apical direction of approx. 3.58 °, which, however, is noticeable only with a diameter difference of 0.15 mm due to its short length. The inner diameter of the self-tapping thread 6 is shaped equivalently to the outer diameter and has a thread depth 14 of about 0.875 mm, with 15 being 1.5 mm (Fig. 6). Between the two adjacent turns of the triangular thread 16a and 16b (Fig. 1) on the inner diameter is provided a corresponding circular recess 17 with a radial depth of 1.75 mm (calculated on the outer diameter), as the side contours of the turns of the threads 16a and 16b, however, are straight and form a sharpening angle alpha = approx. 40 °. In this way, the axial compression of the cancellous bone tissue is significantly improved. The tips 18a, 18b (Fig. 6) of the outer (enveloping) surface of the thread windings are not rounded, but are sharp as a knife and have an axis width of approximately 0.03 mm.

The next in the apical direction tip of the implant 7 is 1.5 mm long, 1.4 mm outer diameter and apical conical detection to 0.68 mm.

The shape of the windings 1 la-1 lj of the compression thread 4 almost corresponds to the shape of the windings 16a, 16b of the self-tapping thread 6, i. - triangular. But the difference is that the turns 16a, 16b of the self-tapping thread 6 on the axis are steeper (sharpening angle alpha = approx. 40 °) and on the radius deeper (approx. 1.5 times more deep), compared to the axial surfaces (mean beta sharpening angle = approx. 60 °) and the shallower radii of windings 11 a-1 lj of the self-tapping thread 4. This facilitates the winding of implant 1 and compression of the sponge bone tissue and in the axial direction, something that was not known according to the level of technical development.

With regard to the height of the self-tapping thread, the following can be further noted:

The height of the thread (axial length) of the self-tapping thread 6 is always the same (ie regardless of the length of the bone in the implant 1), - the length of the axis of the self-tapping thread 6 is mainly 1.5-4 mm, while the jaw-bone the compression part of the compression thread 4 can be between 4 and 20 mm long.

The reason for this is the need for this part of the thread 6 to reach only the opposite cortical end and penetrate it, this cortical end is almost always the same thickness, regardless of the height of the alveolar growth, in which the compressive part of the thread 4 is subsequently placed. of implant 1.

In principle, it is sufficient for this self-tapping thread 6 to be anchored at 0.5 -1 mm at the opposite cortical end. But because the rough compression thread must always be fully wound into the bone (if rough parts remain in the area of the mucosa or even in the oral cavity, bacteria can settle there and lead to infection) and often the exact length cannot be determined. of implant 1, it is desirable that the self-tapping thread 6 be 1.5-4 mm long, so that the surgeon has the opportunity to react to differences and place the implant in the most optimal way, resp. to compensate for deviations from the planned procedures.

In relation to the thread widths, the following can be noted:

In a particularly suitable embodiment, the self-tapping thread 6 is wider than the widest part of the compression thread 4: for example, the self-tapping thread 6 can be between 5.5 and 7 mm wide - for placement in

1911 UI rear upper and lower jaw while compression thread 4 has a maximum diameter of 44.5 mm. In this case the procedure is as follows with its penetration the self-tapping thread 6 cuts the bone and rests on the cortical end. 5 The self-tapping thread 6 (but still connected bone tissue) is subsequently compressed, stabilized and compacted again by the compression thread 4. It should be borne in mind that the hole in the core for such an implant is approximately 2.0 mm, then insert the self-tapping thread 6 with a length of for example 5-7 mm and that the core of the compression thread (with a nominal diameter of a maximum of 4.1 mm) is 3.6 mm thick. The process can be compared to that of sandblasting, in which there is not only removal but also compaction of the surface.

If the cortical bone margin is highly mineralized, it may be appropriate to replace the edged turns of the implant thread according to the utility model with the already known microthreads or microchannels. It is better for these structures to be smooth in the upper part (near the point of contact) in order to avoid the colonization of bacteria.

Compared to the level of technical development, a particular advantage of this implant 1 is the fact that the rough compression thread 4 in interaction with the self-tapping thread in both directions especially reliably prevents the development or rewinding of implant 1. Surprisingly, the implant according to the utility model even with very short threaded parts requires a large winding force of 35, which means great initial stability. This resistance is greater than the two zones of resistance of the thread, which was proved experimentally:

Winding force compression screw with 40 similar construction (with jaw-bone length 13 mm) without apical self-tapping thread: 50 Ncm.

Cortical screw winding force (only with apical self-tapping thread, 3 mm / 45 h): 30 Ncm.

Screw winding force according to the utility model with compression and self-tapping thread (with jaw length 13 mm; plus 3 mm / h): 140 Ncm. 50

The coronal portion of the compression thread 4 of the screw implant 1 after the implantation has taken place enters the spongy cortical or fastening bone tissue.

The design of the implant according to the utility model is not limited to monolithic implants: composite implants can also be successfully placed, which consist of the jaw-bone implant body and the associated abutment and have different threads.

Legend of the figures

1. Screw implant

2. Implant head

3. Implant neck

4. Compression thread

5. Non-threaded area

6. Self-tapping thread

7. Tip of the implant

8. Cutting

9. Radial thread depth of 4

10. Thread pitch of 4

11. Threaded spirals 11 a-11 j of 4

12. Circular recess between 11

13. Tips 1 For-13j from 11

14. Radial thread depth of 6

15. Thread pitch of 6

16. Threaded spirals 16a and 16b of 6

17. Circular recess between 16

18. Tips 1 3a and 1Hb of 16

A: Symmetrical to the center line axis of an imaginary inner cone alpha = sharpening angle of 16 beta = sharpening angle of 11

Claims (17)

Claims A helical implant (1) for a jawbone with a coronal compression thread (4) with threaded spirals (11 a-11 j) and an apical self-cutting thread (6) with threaded spirals (16a, 16b), the thread steps of which (10, 15) are identical, as to the coronal head of the implant (2) apically in the final position at least in the spongy bone tissue is attached the compression thread (4), to which apically in the final position in the jaw bone is attached the self-tapping thread ( 6), both the inner and outer diameters of the compression thread (4) at least in their apical section tapering conically from the coronal to the apical direction, characterized in that the axial 1911 UI th length of the compression thread (4) is from 2.5 to 1.875 times the axial length of the self-tapping thread (6), respectively from 1.5 to 1.125 times the axial length of the self-tapping thread (6), and that the radial depth- 5 the amount (14) of the self-tapping thread (6) is greater than the radial depth (9) of the compression thread (4) in the apical portion, preferably from 1,875 times to 1,125 times, and that the sharpening angle (beta) of the threaded spi- 10 rallies (11a-11 j) of the compression thread (4) is larger than the sharpening angle (alpha) of the threaded spirals (16a, 16b) of the self-cutting thread (6), preferably from 1,875 times to 1,125 times. 15 Screw implant (1) according to claim 1, characterized in that the maximum outer diameter of the compression thread (4) is equal to or smaller than that of the self-tapping thread (6), preferably from 1.32 to 2.20 times, 20 resp. from 1.08 to 1.8 times. Screw implant (1) according to claim 1, characterized in that the maximum outer diameter of the compression thread (4) in the fastening section is larger than that of the self-cutting thread (6), preferably from 1.32 to 2.20 times, resp. . from 1.08 to 1.8 times. Screw implant (1) according to one of Claims 1 to 3, characterized in that the inner and / or outer diameter of the self-tapping thread (6) at least in its apical region tapers conically from coronal to apical. direction. Screw implant (1) according to one of Claims 1 to 3, characterized in that the inner and / or outer diameter of the self-tapping thread (6) tapers conically in its coronal region from the coronal to the apical direction. Screw implant (1) according to one of Claims 1 to 5, characterized in that the minimum inner diameter of the compression thread (4) is approximately equal to +/- 10% of the maximum inner diameter of the self-tapping thread (6). ). 45 Screw implant (1) according to one of Claims 1 to 6, characterized in that the conical angles of the inner and outer diameters of the compression thread (4) as well as of the self-tapping thread (6) are the same and In particular, from 3.85 ° to 3.15 ° and from 5.5 ° to 4.5 °. Screw implant (1) according to one of Claims 1 to 7, characterized in that the conical angles of the inner and outer diameters of the compression thread (4) are the same and vary in particular from 6.25 ° to 3.75 ° and that the conical angles of the inner and outer diameters of the self-tapping thread (6) are the same and are in particular from 4.375 ° to 2.625 °. Screw implant (1) according to one of Claims 1 to 8, characterized in that there is a circumferential recess (12) with a diameter of 0.9375 mm between the turns (11a-1 lj) of the compression thread (4). up to 0.5625 mm. Screw implant (1) according to one of Claims 1 to 9, characterized in that there is a circular recess (17) with a diameter of 2.1875 mm to 1.3125 between the windings (16a, 16b) of the self-tapping thread (6). mm. Screw implant (1) according to one of Claims 1 to 10, characterized in that the surface of the compression thread (4) is rough and the surface of the self-tapping thread (6) is smooth. Screw implant (1) according to one of Claims 1 to 11, characterized in that another coronal self-tapping thread, identical to, for example, the apical self-tapping thread (1), is provided between the neck (3) of the implant and the compression thread (4). 6). Screw implant (1) according to one of Claims 1 to 12, characterized in that a non-threaded section is formed between the compression thread (4) and the self-tapping thread (6), formed cylindrically or conically and having the same diameter, resp. equal angle of the cone as a section before and after it. Screw implant set (1) according to one of Claims 1 to 13, characterized in that the axial lengths of the self-tapping thread (6) of all screw implants (1) of the set are always the same and are from 1, 5 to 4 mm, and that the axial lengths of the compression thread (4) of all screw implants (1) of the kit differ stepwise by a minimum of 2 mm and are in the range of about 4 mm and 20 mm. 1911 UI Screw implants according to one of the preceding claims, characterized in that in the upper part of the compression thread the thread is formed as a microthread or has circular microchannels. Screw implant according to Claim 15, characterized in that at least a part of the microthread, resp. of the microchannels have the same surface. Screw implant according to one of the preceding claims, characterized in that the jawbone body of the implant is screwed or glued to an abutment.