WO2004037110A1

WO2004037110A1 - Intraosseous dental implant and dental implant set

Info

Publication number: WO2004037110A1
Application number: PCT/CH2003/000690
Authority: WO
Inventors: Max Mettler
Original assignee: Max Mettler
Priority date: 2002-10-23
Filing date: 2003-10-23
Publication date: 2004-05-06
Also published as: AU2003271486A1

Abstract

The invention relates to a screw intraosseous dental implant which is characterised by a bone screw (11) having a coronal joint surface (13) and a neck part (67) which can be positioned with a positioning surface (63) on the joint surface (13) and comprises a coronally extending implant neck. Said neck part (67) can be placed on the bone screw (11) and connected thereto by means of a fixing screw (53). The structural boundary between a surface (41) promoting the osseointegration and a hygiene-friendly surface (42) is located on the neck part (67), coronally in relation to the positioning surface (63) and the joint surface (13), the joint between the positioning surface (63) and the joint surface (13) thus fully reaching into the region of the bone. The neck part (67) can be placed on the bone screw (11) in a plurality of relative rotational positions in relation to a rotation about the shank axis (10) of the bone screw. This form enables a number of differently shaped neck parts (67) to be combined in any way with a number of differently shaped bone screws (11), and enables the height of the structural boundary (19) to correspond to the bone line in a very precise manner. In this way, from a medical point of view, the surface structure (41, 42) of the implant advantageously corresponds to the bone line in an optimum manner; from an aesthetic point of view, the crown line between the tooth crown and the implant is adapted to the gum line in an optimum manner; and from a production point of view, the number of parts required to produce a defined number of anatomically adapted implants is reduced. It is thus also possible, for a screw implant, to design the implant neck in such a way that it is bent in relation to the direction of the shank axis of the bone screw (11).

Description

Endosseous dental implant and dental implant set

The invention relates to an endosseous dental implant according to the preamble of patent claim 1 and to a dental implant set according to the preamble of patent claim 7.

The screwable implants make up a very significant proportion of the commercially available endossal implant abutments. Such implant screws are usually made of titanium and have a threaded shaft that can be screwed into the jawbone. The implant is widened towards a shoulder surface in order to form the most natural possible basis for the crown to be fixed on it. The part of the implant which comes to lie within the bone is provided with a surface which promotes osseointegration and ensures the greatest possible adhesion to the bone. This is achieved, for example, with an SLA surface. The implant neck protruding from the bone has a surface that is as easy to clean as possible and compatible with soft tissue. The micro-rough surface used for osseointegration borders the smooth, hygienic surface for the area of the soft tissue along a structural boundary. A shoulder surface defines the attachment point for the crown along a crown line between the tooth crown and the implant.

This structural boundary and this crown line are conventionally formed along two parallel circular lines that lie on planes lying perpendicular to the axis of the implant screw. In the case of implants in the posterior region, this structural limit corresponds sufficiently to the natural course of the bone. In the case of upper premolars and anterior teeth, however, the ϊbone is usually deeper buccally than orally. The approximal height in the area between the teeth is at least higher than a buccal apex and often also higher than an oral apex of a bone progression line. The soft tissues are shaped according to the anatomical shape of the bones. The However, the distance between a gum line running around the tooth and the bone line is subject to relatively large fluctuations from person to person. These individual soft tissue thicknesses are countered by implant screws with different distances between the structural boundary and the shoulder surface.

With conventional implant screws, it is often not possible to find a medically and aesthetically satisfactory solution, particularly in the anterior region. It is medically unsatisfactory that the structural boundary is to be arranged partially below and / or partially above the bone course. This leads to disadvantageous requirements for hygiene and the creation of "pseudo pockets". It is very unsatisfactory that, especially in the esthetically sensitive anterior region, secondary surgical interventions often have to be carried out in order to achieve acceptable conditions in the red esthetic region (gums).

An endosseous dental implant is known from W098 / 42273, which provides for an adaptation of the implant to the natural course of the bone and the natural course of the tooth flesh. The implant comprises a threaded, rotationally symmetrical implant root, a head part and an axial threaded hole in the implant root that starts from the head part. The threaded hole is provided to receive a fastening screw, which is used to hold a tooth crown. The headboard is tapered on two sides. The taper is formed by two bevels that run on both sides of the threaded hole and across the row of teeth. The bevels form lines of intersection with the circumference of the head part. The height of these cut lines is adapted to the shape of the upper edge of the jawbone. A detachable from the implant root contact body between the head part and the tooth crown is adapted to the taper and also towards the tooth crown according to the bevels of the head part to follow the course of the soft tissue. In order to improve the adaptation to the anatomy of the jawbone and the soft tissue lying above it, the two bevels can be designed asymmetrically. This special shape of the implant means that it can be adapted to the Level differences between the buccal and oral heights of the jawbone reached. In addition, the approximal height is adjusted and a natural upper edge of the jawbone is reproduced. The inclined surfaces, over which the head part and the contact body interact, ensure that the contact body is secured against rotation

Headboard. The contact body forms the neck area to be arranged within the gums and therefore also a crown line which corresponds approximately to the course of the gums below the gum line.

From WO01 / 49199 an endosseous dental implant with an anatomically adapted configuration is known. The implant has an apical shaft section on which an external thread can be present and which ends with an implant tip. An implant neck adjoining the shaft section ends with an implant shoulder. An additive and / or non-additive surface structuring is formed to favor the osseointegration. This extends over the shaft area to a structural boundary located on the implant neck. Such an implant must be inserted into the jawbone up to the structural limit. The structure boundary drops anteriorly in the apical direction to a low level and rises to the proximal implant flanks in the opposite direction to a high level.

In one embodiment, an abutment that can be placed on the anatomically adapted implant shoulder and is fixable on the implant is provided. The abutment consists of a disc and can have a stump protruding coronally to anchor the superstructure. The disc forms the tooth neck arranged in the gums and an anatomically shaped crown line at the attachment point of the crown on the abutment. A preferred material for the abutment is ceramic, which harmonizes in color with the soft parts. The abutment has a sleeve-shaped extension below the disc, in which the screw head of a base screw is supported on a support ring. The abutment is fixed on the implant shoulder using the base screw, the threaded shaft of which engages in an internal threaded hole in the implant. The extension protrudes into one Cylinder bore into the shaft area. The structural boundary can extend to the outer edge of the implant shoulder. The surface structure on the implant neck can consist solely of the fine, micro-rough structure that is present on the shaft part, or can additionally have a thread.

In further exemplary embodiments, a shaft part is formed with an anatomically shaped implant shoulder. A ring made of plastic or ceramic with an anatomically designed upper edge is placed on the implant shoulder. The ring is flared conically and screwed into the shaft section through an implant insert. An internal polygon is formed in the implant insert and axially a threaded hole for receiving and fastening an abutment is formed. The structural boundary coincides with the outer edge of the implant shoulder.

In these known implant screws, the height of the structure limit with respect to the bone line depends on a number of complete revolutions of the implant screw. If the buccal and oral vertices are symmetrical, the height can be adjusted to half a turn of the implant screw. With common thread pitches, the alignment of the structural boundary is therefore only possible to within a good millimeter, or without optimal lines of the structural boundary, to within half a millimeter. Precise alignment of the structural border on the bone line and the crown line parallel to it on a gum line is therefore not possible despite the anatomical conception.

In an embodiment modified from the first embodiment mentioned and shown in FIG. 1, the anatomical design of the structural boundary 19 is deviated from. A thread 12 and a horizontally extending implant shoulder 13 are provided on the implant shaft 11, which could also be conical. An abutment 15 is placed on this implant shoulder 13, which continues the widening of the neck area 17 started on the implant shaft. The structural boundary 19 lies below the implant shoulder 13 or preferably on the outer edge 21 of this implant shoulder 13. Inside the The implant has a receiving bore 23 with a position contour 25 below the mouth (for example a circumferential toothing). In order to position the abutment 15 on the implant with respect to its relative rotational position, cams (not shown because they are concealed) engaging in the positioning contour 25 are provided on an extension 27 of the abutment 15. Below the position contour 25, the cylinder bore 31 continues coaxially to a base 33, from which the internally threaded bore 35 extends axially apically to the base 37 of the bore. The external thread 12 with the superimposed micro-rough surface structure 41 is present on the outside of the shaft part. The abutment 15 has a disc 43 and the extension 27, as well as a stump 45 with an access 47 to an engagement contour 49 in the screw head 51 of a fastening screw 53. The disc 43 has a substructure 55 covering the horizontal implant shoulder 13, as well as a curved roof section 57 symmetrical inclination from the raised proximal side flanks 59 to an anterior and a posterior depression 61. The crown is modeled on this roof area 57. The roof section 57 therefore defines the crown line 58. The prerequisite for the feasibility of this arrangement, according to this publication, is that the microgap between the implant shoulder 13 and the substructure 55 of the disk 43 can be closed to less than 1 micrometer and does not increase in size with micro movements.

In this exemplary embodiment of WO01 / 49199, the height of the implant and thus the height of the crown line 58 can be determined very precisely thanks to the formation of a horizontal implant shoulder 13 and the possibility of using the abutment 15 in a plurality of rotational positions in the implant shaft 11. However, the structural boundary 19 is formed on the outer edge 21 of the implant shoulder 13 and therefore follows a horizontal circular line and is not anatomically adapted.

It is therefore an object of the invention to propose a screwable, endosseous dental implant in which both the structural boundary between a surface structure which favors osseointegration and a hygiene-friendly neck structure and the crown line are anatomical can be shaped and yet the heights of both the structural boundary and the crown line can be precisely selected.

According to the invention, this object is achieved by the features of claim 1.

As shown above, an endosteal dental implant is known from the prior art, which has an implant shaft that extends along an axis of the shaft and ends in a shaft tip and an implant neck that adjoins the implant shaft coronally. The implant neck is flared coronally and ends with a shoulder surface that defines a crown line. The structural boundary is formed on the implant neck between a surface structure to be arranged in the bone, which promotes osseointegration, and a hygiene-friendly neck structure to be arranged above the bone. This implant includes a bone screw and a neck part. The bone screw essentially forms the implant shaft and has a joint surface coronally. The neck part has the shoulder surface, is designed to be detachable from the bone screw, and can be fixed to the bone screw with a seating surface placed on the joint surface. Furthermore, the joining surface and the seating surface are designed corresponding to one another in such a way that the neck part and the bone screw can be joined in a plurality of relative rotational positions.

As an innovation in such an implant, the structural boundary is now formed on the neck part, so that the joint surface of the bone screw is apical to the structural boundary and therefore completely lies in the bone after implantation of the implant.

This not only allows the bone screw to be screwed in by fractions of a full turn to the exact desired depth. This also allows the structure boundary and the shoulder surface to be formed independently of the length and thickness of the bone screw. There can therefore be a manageable number of bone screws of different lengths and / or different diameters with an equally manageable number of neck parts of different designs for an enormous variety of individual adapted implants are put together according to the situation. Furthermore, in this embodiment, the joint between the bone screw and the neck part is at a location in the bone which is protected from infections and grows together with the bone. Finally, since the neck part is not screwed in, but inserted into the bone screw, this construction also allows the neck part to be provided with ribs aligned parallel to the shaft axis, which protect the implant against rotation about the shaft axis and thus against unintentional unscrewing and a large area Offer near the bone surface for osseointegration. Last but not least, the advantage should be emphasized that thanks to this design, the neck parts can be produced in a wide variety of anatomical shapes without the number of implant parts to be offered increasing excessively. Finally, it should also be mentioned that the design of the implant screw according to the invention also allows implant screws to be produced and used with a neck part angled relative to the screw shaft. Angling the neck of the implant was previously only possible with hollow cylinder implants.

The bone screw advantageously has a positioning contour and the neck part has at least one shape which interacts with the positioning contour. The positional contour and the shape allow the neck part and the bone screw to be secured against rotation. The position contour can advantageously be formed under the mouth of an axial cylinder bore in the bone screw and the shape on a bolt that can be inserted into the cylinder bore. However, the position contour can also be formed on a bolt which can be inserted into a bore in the neck part. In this case, the formation in this bore is formed in the neck part. Furthermore, the position contour can be formed on, in or with the joining surface and the shape correspondingly in, on or with the seating surface. The joining surface and the seating surface are therefore not necessarily rotationally symmetrical with respect to the shank axis, but can also be designed only axially symmetrical. A preferred rotary grid dimension, in which the rotary grid dimension of the neck part and bone screw can be joined together, is at least 90 ° (for example square as a position contour), preferably 60 ° (for example hexagon), particularly preferably 45 ° (for example octagon as a position contour). This allows for common Thread pitches of just over one millimeter precisely adjust the height of the structural boundary with respect to the bone line to about 1/4 mm, 1/6 mm or 1/8 mm. The bores and the bolts can be cylindrical or conical. As an alternative or in addition to the position contour, the neck part and the bone screw can therefore work together via a cone clamp.

In order to complete the implant to form an implant abutment, there is a secondary part, for holding a tooth crown, for example, and a fastening screw for fastening the secondary part to the implant. The fastening screw can be screwed through the neck part into an internal thread formed in the bone screw. Therefore, only a single screw is necessary to connect both the secondary part and the neck part to the bone screw.

At least one accessory is advantageously provided which has a placement surface that can be placed on the shoulder surface. Such an accessory is, for example, a healing cap, a temporary restoration and / or an impression screw. These parts have a mounting surface which is designed to be complementary to the shoulder surface of the neck part.

A model is usually produced for dental work. For this model, a manipulation implant with a model shoulder surface corresponding to the shoulder surface of the implant and, if appropriate, a manipulation secondary part for fitting onto the manipulation implant are advantageously provided. The manipulation implant can be designed in one piece and without thread. The position with regard to the height and angular position of this manipulation implant is determined in any case via a cast of the implanted implant.

A dental implant set for such a dental implant accordingly has a plurality of bone screws of at least different lengths. These bone screws preferably have identically designed joining surfaces. For this purpose, the set includes a plurality of neck pieces with different ones Anatomical designs of the structural border and shoulder area and identically designed seating areas are available. These can therefore be combined as desired with the bone screws.

The bone screws are also advantageously varied in terms of their diameter. However, the diameter of the joint surface is advantageously identical regardless of the diameter of the bone screw. This enables the combination of screws with different diameters with the same neck parts.

The neck parts of the set are advantageously varied with regard to the height difference between an oral apex and a buccal apex of the structural boundary in order to be able to take into account the individual anaotomic conditions. In addition, they are advantageously varied with regard to the distance between the structural boundary and the shoulder surface in order to have different neck parts available according to the individual gum strengths. Even the alignment of the seating surfaces of the neck parts is advantageously varied with respect to the alignment of the structural boundary and shoulder surface. This makes it possible to correct a deviation of the screwing direction from the optimal alignment with respect to the bone edge. Since there are different neck parts with regard to the buccal and oral height of the crown line and structural border, only different neck parts are required for correcting the height of the approximal flanks.

Brief description of the figures:

The invention is explained in detail below with reference to drawings. It shows:

1 is a perspective drawing of the prior art according to WO01 / 49199, FIG. 2 is a perspective drawing of a first embodiment of the invention, FIG. 3 is a side view of a second embodiment of the invention, Fig. 4 is a side view of the neck part according to Figure 3 and one

Bone screw with a larger diameter and longer length than the bone screw according to FIG. 3,

Fig. 5 is a partially cut side view of a third embodiment with bone screw, neck part, secondary part and

Mounting screw,

6 shows an implant set with manipulation secondary parts, provisional restorations, secondary parts, neck parts, bone screws, manipulation implants and healing caps, as well as a fastening screw and a screwing tool.

FIG. 2 shows a first exemplary embodiment of the invention. Parts of the implant according to the invention, which correspond to parts of the implant according to the cited prior art, are identified by the same reference numerals, although other terms have been chosen to distinguish them more clearly. Corresponding parts in the exemplary embodiments are designated by the same reference numerals.

The exemplary embodiment shown in FIG. 2 has a bone screw 11 with a blunt screw tip and an external thread 12. A joining surface 13 is formed coronally on the bone screw 11. As shown here, this can be designed to be flat and rotationally symmetrical to the shaft axis 10. Other rotationally symmetrical shapes and 10 axially symmetrical shapes with respect to the shaft axis are possible. In the interior of the bone screw 11 there is a receptacle 23 for an extension 27 of a neck part 67 described in more detail below. At the mouth of the receptacle 23, a positioning contour 25 in the form of a toothing is formed. The receptacle 23 extends to a base 33, from which a threaded bore 35 extends to the base 37 of the bore.

The neck part 67 has a setting surface 63 around the extension 27, which interacts with the joining surface 13. When they are joined together, only a microgap is formed between these surfaces 13, 63. The neck part 67 has a shoulder surface 65. This shoulder surface 65 forms the uppermost end of the neck part 67 and runs along a crown line 58 as parallel as possible to one anatomical course of the bone margin or gum margin. A structural border 19 is formed on the neck part 67 below and parallel to the crown line 58 along the outer edge of the shoulder surface 65. The structure boundary 19 forms the boundary between a lower, micro-rough structure 41, which promotes osseointegration, and an upper, smooth neck structure 42, which promotes cleaning of the tooth neck.

An internal polygon 69 is formed in the interior of the neck part 67. An opening is formed in the bottom of the polygon through which the fastening screw 53 can be tightened with a screwdriver.

This opening has an internal thread into which a fastening screw for a secondary part can be screwed (not shown). The internal polygon 69 is used to hold a secondary part in such a way that it cannot rotate.

A cross-sectional enlargement in the neck area of the implant begins at the implant screw and continues on the neck part. This increase in cross section favors primary stability of the implant. It may be necessary to drill out the jawbone with a drill specially designed for this cross-sectional enlargement. For this purpose, the drill advantageously has an indexing on which the penetration depth of the drill can be read.

The same neck part 67 is shown twice in FIG. 3 and FIG. This has a structural boundary 19 which is formed between the shoulder surface 65 and the seating surface 63. The lower portion of the neck portion 67 between the

Structural boundary 19 and the seating surface 63 are designed to be micro-rough, as is the outer surface 41 of the bone screw 11. The upper part of the neck part between the structural boundary 19 and the shoulder surface 65 is smooth. An extension 27 extends apically on the neck part 67 and has a polygonal cross section. A hole is provided centrally through the neck part, through which a fastening screw can be screwed into the bone screw 11. Coronally, this hole is expanded to an internal polygon and on the mouth side, then a cone for receiving a secondary part. The extension 27 can be inserted coronally into a bone screw 11. For this purpose, the bone screw has a receptacle 23 with a polygonal cross section and a threaded bore 35. The bone screws 11 in FIGS. 3 and 4 are of different sizes. The bone screw 11 in FIG. 3 is shorter and has a smaller diameter than the bone screw 11 in FIG. 4. However, both bone screws have a coronal joining surface 13 which have the same diameter. The diameters of the joining surfaces 13 have the same diameter as the seating surface 63 of the neck part 67. The receptacles 23 for the extension 27 on the neck part 67 and the threaded bore 35 for receiving a fastening screw are identical in both bone screws. This allows the neck part 67 to be placed on a bone screw 11 of your choice.

In FIG. 5, an implant pillar with bone screw 11, neck part 67, secondary part 71 and fastening screw 53 is shown partially cut away. There is a structural border 19 on the neck part 67 between the micro-rough structure 41 on the bone screw 11 and on the lower part of the neck part 67 and the hygiene-friendly neck structure 42 coronal to the structural border 19. A joint is formed between the neck part 67 and the bone screw 11. This joint is due to the abutting surfaces of the neck part and

Bone screw formed. The seating surface 63 on the neck part 67 has a flat partial surface and a toothed conical surface 73 abutting this flat partial surface at an angle, which ensures a rotationally secure connection to the bone screw. Corresponding to the toothed cone surface 73 on the neck part 67, the joint surface 13 on the bone screw is also provided with a toothed ring which forms a positioning contour 25. Thanks to the axially symmetrical design of the joining surface 13 and the seating surface 63, the neck part 67 can be joined together in different rotational positions relative to the bone screw 11, the joint between the joining surface 13 and the seating surface 63 being tight in every position. The bone screw 11 penetrates in this

Embodiment with the positioning contour 25 in an opening in the neck part 67. In the neck part 67, the secondary part 71 is seated with a cone 75 in an inner cone 77 of the neck part 67. The secondary part 71 has an extension 79 which extends into a receptacle 23 in the bone screw. To prevent rotation between the secondary part and the bone screw, the extension 79 on the secondary part 71 and the receptacle 23 in the bone screw are designed to be correspondingly polygonal. The secondary part has a stump 45 with access to the head 51 of the fastening screw 53. The fastening screw 53 is screwed into the threaded bore 35 with its threaded section 54. It presses the secondary part 71 against the neck part 67, and this together against the bone screw 11.

The set shown schematically in FIG. 6 comprises manipulation secondary parts 72 made of plastic in the top row, provisional supply parts 82 made of plastic in the second row with a mating surface 68 adapted to the shoulder surface 65 of the neck parts 67, including a third row with ceramic secondary parts , Metal or plastic, for insertion in the dental implants. In the middle row are a plurality of neck parts 67 made of plastic, ceramic, titanium or a titanium alloy with different shoulder surfaces 65 and different distances between the crown line and the structural boundary.

In this row a second last neck part 67.5 is shown, in which the shoulder surface 65 is inclined relative to the seating surface 63. This inclination is not clearly recognizable in the curved crown line 58 shown. However, the surface orientation of the shoulder surface 65 is not parallel to the seating surface. This feature is only possible, in particular in the case of flat or conical shoulder surfaces 65, thanks to the division of the implant into a bone screw 11 and a neck part 67. In the example shown, the inclination of the shoulder surface can be recognized by the inclination of the temporary restoration 82.5 and the healing cap 85.5. The last neck part 67.6 of this row is a neck part with a flat or conical shoulder surface 65. Together with the bone screws 11, this neck part replaces a number of commercially available, one-piece implant screws corresponding to the number of bone screws. The fifth row shows bone screws 11 made of titanium or a titanium alloy with different lengths and diameters. The sixth row shows manipulation implants 83 made of plastic or metal for insertion into a model. These have shoulder surfaces 88 which correspond exactly to the shoulder surfaces 65 of the neck parts 67 in the fourth row. The manipulation implants 83 are shown in one piece in FIG. Since they do not need to be screwed in, their height in the model can be set exactly and regardless of the orientation of the shoulder surface 88. It is also conceivable to provide two-part manipulating implants, for example consisting of a screw and a neck part.

In the seventh or bottom row, healing caps 85 made of plastic or metal are shown with mating surfaces 89 matched to the shoulder surfaces 65 of the neck parts 67. A screwing-in tool 87 for screwing in the fastening screw 53 is shown at the bottom.

Thanks to the division of the implant screw into a neck part and a bone screw, neck parts can also be screwed into the bone, which neck parts are not rotationally symmetrical. Therefore, the neck parts of the tooth shape can be rectangular in shape with rounded corners.

The fastening screw 53 is partially shown integrated in the neck parts 67. However, the fastening screw 53 is shown as a separate part above the secondary part 71.1. Regardless of whether the attachment of the secondary part 71 and neck part 67 to the bone screw 11 is carried out separately or with a common fastening screw 53, this division of an implant pillar into a bone screw 11, a neck part 67 and a secondary part 71 offers the advantage of countless possible combinations. If, for example, only five secondary parts, five neck parts 67 and five bone screws 11 could be combined, this would already result in 125 possible combinations with only 15 parts.

However, a realistic row of bone screws has 4 different lengths in two different diameters. For example, it has an expedient row of neck parts in four different crown lines two to three different distances between the crown line and the structural boundary. There are currently 6 or more of the secondary parts. With 22 parts, these series would give 384 possible combinations. Where a large number of implant screws with different shoulder widths, distances between the shoulder surface and structural boundary, screw diameters and screw lengths are now necessary, these offers can be covered by a few neck parts 67 with a set according to the invention. In the case of a set, it is necessary that the interacting surfaces of neck part 67 and bone screw 11, of secondary part 71 and neck part 67 and of secondary part 71 and bone screw 11 are coordinated with one another, regardless of the remaining shape of these parts.

In summary, the screwable endosseous dental implant has a bone screw 11 with a coronal joining surface 13 and one with a

Placing surface 63 on the joining surface 13, the neck part 67 can be placed. The neck part 67 forms an implant neck which widens coronally, can be plugged onto the bone screw 11 and can be connected to the bone screw 11 with a fastening screw 53. The structural boundary 19 between a surface 41 that favors osseointegration and a hygiene-friendly surface 42 lies on the neck part 67. Therefore, it lies coronal to the seating surface 63 and the joining surface 13. The joint between the seating surface 63 and the joining surface 13 thus reaches the area of the bone completely. The neck part 67 can be placed on the bone screw 11 in a plurality of relative rotational positions with respect to a rotation about the shaft axis 10 of the bone screw 11. This shape allows a number of differently shaped neck parts 67.1 to 67.5 to be combined with a number of differently shaped bone screws 11.1 to 11.5 and to adjust the height of the structural boundary 19 very precisely to the bone line. From a medical point of view, this is the advantage of an optimal coordination of the surface structure 41, 42 of the

Implant reached on a bone line. From an aesthetic point of view, the optimal adaptation of the crown line 58 between the tooth crown and the implant to a gum line is made possible. From a manufacturing point of view, a reduction in the number of parts required to produce a certain number is anatomical adapted implant pillars reached. This design has also made it possible for the implant neck to be bent in relation to the direction of the shaft axis 10 of the bone screw 11.

References directory:

10 11 implant shaft, 58 crown line

Bone screw 35 59 approximal side flanks,

12 threads, external thread approximal flanks

13 implant shoulder, joint surface 61 lowering, apex of the

15 Abutment shoulder area

15 17 neck section 63 seating surface of the neck section 67

19 Structural boundary 40 65 shoulder surface of the neck part 67

21 edge 67 neck part

23 Location bore 69 Inner polygon in the neck section 67

25 Position contour 71 secondary part

20 27 extension 72 manipulation secondary part

31 cylinder bore 45 73 toothed conical surface of the

33 bottom neck part

35 Internal threaded hole 75 Cone of the secondary part 71

37 Bohrgrund 77 inner cone of the neck part 67

25 41 micro-rough surface structure 79 extension on the secondary part 71

43 Disc 50 82 provisional supply

45 stump 83 manipulation implant

47 Access 85 Healing cap

49 Engagement contour 87 Screw-in tool

30 51 screw head 88 shoulder surface on manipulator

53 fixing screw 55 implant 83

55 Substructure 89 Fit surface on the healing cap

57 roof section 85

Claims

claims

1. Endosseous dental implant with

- a bone screw (11) which has a joint surface (13),

a neck part (67) forming an implant neck, which has a seating surface (63) for placement on the joint surface (13), and the seating surface (63) opposite a coronal shoulder surface (65),

- The joining surface (13) and the seating surface (63) are designed corresponding to one another in such a way that the neck part (67) and the bone screw (11) can be joined together in a plurality of relative rotational positions with respect to the shaft axis (10) as the axis of rotation,

and with a surface (41) which favors osseointegration on the bone screw (11) and a structural boundary (19) between the surface (41) which favors osseointegration and a hygiene-friendly surface (42), characterized in that

- That the neck part (67) adjoining the seating surface (63) has a surface (41) which favors the osseointegration, and

- That the structural boundary (19) on the neck part (67) and therefore coronal to a joint between the joint surface (13) and the seating surface (63).

2. Dental implant according to claim 1, characterized in that the structural boundary (19) corresponding to the course of the anatomical bone line has a more apical apex (62) and more coronal proximal flanks (60), and that the shoulder surface corresponds to the anatomical course of the gum line correspondingly has a more apical apex (61) and more coronal proximal flanks (59).

3. Dental implant according to claim 1 or 2, characterized in that the bone screw (11) has a positioning contour (25) and that the neck part (67) has at least one shape interacting with the positioning contour (25), which position contour (25) and Form allow a non-rotatable joining of the neck part (67) and bone screw (11).

4. Dental implant according to one of claims 1 to 3, characterized in that a secondary part (71) for receiving a tooth crown and a fastening screw (53) for fastening the secondary part (71) are present on the implant, and that the fastening screw (53) through the neck part (67) in an internal thread (35) formed in the bone screw (11).

5. Dental implant according to one of the preceding claims, characterized by an accessory which has a placement surface that can be placed on the shoulder surface, in particular a healing cap (85), a provisional restoration (82) and / or an impression screw, the placement surface of the shoulder surface (65) of the Neck portion (67) is designed to be complementary.

6. Dental implant according to one of the preceding claims, characterized by a model part for clarifying a planned intervention on the model beforehand, in particular a manipulating implant (83) with a model shoulder surface (88) corresponding to the shoulder surface (65) of the implant, and optionally a Manipulation secondary part (72) for precise fitting onto the manipulation implant (83).

7. Dental implant set for a dental implant according to one of the preceding claims, characterized by a plurality of bone screws (11.1-11.5) of different lengths and with identically designed joining surfaces (13) and a plurality of neck parts (67.1-67.5) with different anatomical configurations of Structural boundary (19) and shoulder surface (65) and identically designed setting surfaces (63).

8. Dental implant set according to claim 7, characterized in that the bone screws (11) are varied with respect to the diameter.

9. Dental implant set according to claim 8, characterized in that the diameter of the joint surface (13) is identical regardless of the diameter of the bone screw (11).

10. Dental implant set according to one of claims 7 to 9, characterized in that the neck parts (67) are varied with respect to the height difference between an oral apex and a buccal apex (62) of the structural boundary.

11. Dental implant set according to one of claims 7 to 10, characterized in that the neck parts (67.1-67.5) are varied with respect to the distance between the structural boundary (19) and the shoulder surface (65).

12. Dental implant set according to one of claims 7 to 11, characterized in that the alignment of the seating surfaces (63) of the neck parts (67) with respect to the alignment of the structural boundary (19) and shoulder surface (65) are varied.