WO2009090214A2

WO2009090214A2 - Method and model for producing a tooth replacement part

Info

Publication number: WO2009090214A2
Application number: PCT/EP2009/050426
Authority: WO
Inventors: Joachim Pfeiffer
Original assignee: Sirona Dental Systems Gmbh
Priority date: 2008-01-16
Filing date: 2009-01-15
Publication date: 2009-07-23
Also published as: WO2009090214A3; DE102008004741A1

Abstract

The invention relates to a method for producing a tooth replacement part (1) on the basis of a 3D data record P of a preparation site (7.1) and the surroundings thereof and on the basis of a 3D data record PZ of the preparation side (2) with a tooth replacement part (1') which has been virtually placed onto the preparation site (7.1) or on the basis of a 3D data record A of an antagonist tooth (7.4) and the surroundings thereof, wherein the 3D data record P is used to define a preparation side (2) and the second 3D data record A is used to define an antagonistic side (3), and a relative position between the preparation side (2) and the antagonistic side (3) is known. The invention also relates to a model (23) of a preparation side (2) and an antagonistic side (3) of a jaw (7).

Description

description

Method and model for producing a dental prosthesis

Technical area

The invention relates to a method for producing a tooth replacement part based on a 3D data set P of a preparation site and its surroundings and on a 3D data set A of an antagonist and its surroundings, wherein by means of the 3D data set P a preparation page is defined and by means of the second 3D Dataset A an antagonistic side is defined and wherein a relative position between the preparation side and the antagonistic side is known. As a rule, at least one occlusal contact can be produced between these two sides, the relative position taking into account the at least one occlusion contact.

The invention further relates to a method for producing a dental prosthesis based on a 3D data record P of the preparation side consisting of the preparation site and its surroundings, on a 3D data set Z of the dentition part and on a 3D data set PZ of the preparation side with virtually on the Preparation site attached tooth replacement part.

The invention further relates to a model of a preparation side and an antagonistic side of a jaw. State of the art

From DE 101 31 131 Al a method for producing a dental prosthesis as a replacement of individual teeth or groups of teeth in the dental composite of a jaw under intraoral recording of the spatial information of the prosthesis receiving tooth stump or the like is known. The intraoral uptake of the information is also applied to the neighboring teeth of the prosthesis to be produced and extends at least the affected area of the jaw. With the help of this information, a model of the jaw or jaw section with the neighboring teeth is made. The affected area of the opposing jaw is included in the model production.

Furthermore, a method for producing a dental prosthesis with a framework and a veneer is known from DE 10 2005 055 526 A1. For this purpose, three-dimensional geomet- riedaten the veneer are given, after which a model of the veneer on the framework or separately created and then a negative mold of the veneer is created by including the model between the framework and a molding material and then removing the model and filling the negative mold with veneering material, the veneered prosthesis is made.

The dental technician is usually accustomed to determining the relative position between both sides on the basis of the existing occlusion contacts on the basis of a complete jaw model of the preparation side and the antagonistic side and to use this as the basis for the construction of the dental prosthetic item. The dental technician starts from a normally articulated model of the jaw to be treated. To make a crown, he typically makes a cap from a high-strength material, then layers ceramics on this coping in several individual operations and burns them. The shape of the tooth is checked and checked by placing it on the articulated model on all dimensions, in particular on the Aproxi- malkontakte and the occlusion contacts out. For this process, it is important to have a model as a working document. For the finished work is the model in which the restoration or the dental prosthesis fits, also important as an interface documentation. The dental technician supplies the restoration in a partially articulated plaster model of the jaw and thus shows the dentist that he has worked correctly. Mouth-transfer errors are usually at the dentist's expense, as it is assumed that the dentist's impression, on the basis of which the plaster model was made, was incorrect. When the conventional impression of the mouth is replaced by digital 3D measurement data, the dental technician no longer has a conventional impression available for making a model. If the dental technician constructs the dental prosthesis based on the 3D measurement data of the mouth, including the prepared teeth, and produces it computer-aided by rapid prototyping, then a separate model for production is also not required. However, there is the problem of proving that the work was performed correctly based on the 3D measurement data of the mouth, since the dental technician does not have a physical model to check the dentures to be made before they are sent to the dentist by inserting them into a model.

The object of the invention is to design and arrange a model of a preparation side and an antagonistic side of a jaw on the basis of 3D data such that the production of a dental prosthesis part is improved.

Presentation of the invention

The problem is solved by the features of independent claims 1, 2, 14 and 15.

According to the invention, in addition to the occlusion contacts on the preparation side, at least one positioning At least one positioning pad is installed on the positioning bearing in the respective 3D data set P, A on the antagonistic side, wherein the positioning bearing and the positioning pad have positioning surfaces in three spatial directions and wherein the positioning bearing and the positioning pad form a bearing point and the bearing represents the relative position between the preparation side and the antagonistic side.

This ensures that despite the restriction of the model to the closer environment around the preparation site or to the antagonist of the preparation site, the relative position between the preparation side and the antagonistic side is defined independently of any existing occlusion contacts. The dental technician generates according to the invention in the areas in which the jaw information is not required to force, for. B. on the edge of the virtual data image, positioning or positioning counterpart in the records P, A of the preparation side and the antagonistic side, which match. These can be, for example, small cylindrical depressions on one side and matching pins on the other side. Depending on the severity, typically three to four such mating bearings are necessary. These bearings are used in a later process to position the preparation side model and the antagonist side model in a predetermined manner. Afterwards, models of the preparation side and the antagonistic side are produced by typical shaping techniques such as grinding or 3D printing. It suffices to reproduce only the region of interest, that is to say the preparation site, including its surroundings, and the corresponding environment. the antagonist. Both models can now be placed on the bearings accurately to each other and removed again to produce the restoration in the usual dental technique, ie first a framework part and then by layered veneering the finished dental prosthesis.

According to the invention, it is also provided that, starting from the 3D data set PZ, a 3D data record NZ of a negative side of the preparation side is generated with a dental prosthesis part virtually placed on the preparation site. At the

Preparation side is at least one positioning bearing and on the negative side at least one positioning pad is constructed to the positioning bearing, wherein the positioning bearing and the positioning abutment positioning in three spatial directions, and wherein the positioning bearing and the positioning abutment form the bearing, said bearing a relative position between the preparation side and the negative side.

This ensures that the relative position between the preparation side and the negative side is defined independently of any existing occlusion contacts. By means of the 3D data, a model of the tooth replacement part to be produced can be constructed, which can be placed virtually on the preparation site. A 3D data set NZ for the corresponding negative model can be derived or constructed from the data set PZ thus obtained concerning the preparation site, including the attached dental prosthesis part as well as its surroundings. This negative side may be formed by 3D printing, NC grinding or the like in a suitable material, eg. As plastic or wax, are made physically as a model. Likewise, the negative side of the underlying preparation page without the Attached tooth replacement part can be physically produced as a model. In the negative side model, it is preferable to use transparent material such as PMMA (polymethyl methacrylate). Both the model of the preparation side and the model of the negative side can now be arbitrarily disassembled and assembled via the bearings while ensuring the originally determined relative allocation. Based on these models, the dental technician can now perform the following steps to create the dental prosthetic item. The dental technician uses the preparation side data to create a framework of zirconia on the CAM path. He then adjusts the framework to the model of the preparation side, then layers the veneering ce- ramics onto the framework, whereby during the first steps he orients himself primarily on the model of the preparation side. The last layers, which then also determine the shape of the occlusal surfaces of the dental prosthesis part, are oriented on the negative side. For this purpose, the model of the negative side can be repeatedly placed on the model of the preparation side and removed again.

It may also be helpful to place the model of the negative side down and place the ceramic slurry in the model of the negative side. After the usual firing of the layered ceramic, the tooth replacement part is finished by corrective grinding and if necessary by afterburning in such a way that the occlusal surfaces reproduce exactly the shape of the tooth replacement part originally used in the 3D data set PZ. In examining whether the dental prosthesis part is properly shaped, a transparency of the negative side model may be advantageous. So can when putting the model of the Negative side can be found on the produced tooth replacement part, where too much or too little material is available. For the purpose of checking, the tooth replacement part can be placed on the model of the preparation side and measured together with it. The data can then be used with the 3D

Output data set PZ of the virtual model are compared.

By the two above-mentioned procedures, the reproduction of an entire 3D data set of both jaws can be avoided and still allow a articulation-appropriate design of the dental prosthesis manually. The manual reproduction allows the aesthetic design as usual from the ceramic layering.

The positioning bearing and the positioning counter bearing can also have at least one of the following features in addition or alternatively. They interlock spatially, they have a 3D shape and / or they form a pentavalent bearing, which only has a translational degree of freedom regarding the raising and lowering.

It can also be advantageous if the preparation side and the antagonistic side only image a partial area T of a respective jaw, wherein the partial area T comprises / includes a maximum of six adjacent teeth of the preparation site and / or the corresponding number of antagonists. The size of the subregion can be adaptable to the respective situation. In the construction of the dental prosthesis, in addition to the occlusion contacts, which are located in the bearing points, the proximal contacts, that is, the contacts with the adjacent teeth, are also important, so that they are included in the partial area. Significantly larger must be the subarea not be designed. It is particularly important to the arrangement of the bearing points according to the invention at the edge of the sub-area.

In addition, it may be advantageous if the positioning bearing and the positioning support are constructed at an edge R of the portion T or the preparation site. If the subregion extends over a plurality of adjacent teeth, it is also possible to place the bearing point according to the invention at the edge of the preparation site, ie in the region of the adjacent teeth. Since it also does not depend on the occlusion contacts of the neighboring teeth in the model to be produced, and only the proximal contacts to the neighboring teeth are of importance, this region of the subarea T can be used for the bearing points. In addition, it may be advantageous if at least one or three bearings are provided when the bearings are arranged with respect to the preparation site opposite or when all bearings are arranged on one side of the preparation site and the bearings as pin-hole pairing and / or groove Spring pairing are formed. The number of bearings is measured according to the design of the same. Overall, the bearings must ensure a pentavalent bearing between the preparation side and the antagonistic side or negative side, in order to achieve a particularly preferred, unambiguous definition. This could in principle be realized by a hexagonal pin with a corresponding fit on the opposite side by means of a single bearing. However, experience has shown that two or three bearing points must be provided so that the complexity of the individual bearing point does not get out of hand. For the production of the dental prosthesis, it is advantageous if a model of the preparation side and the antagonistic side including the bearings or a model of the preparation side and the negative side including the bearings is made, the dental prosthesis is made by layering and in the coating of the dental prosthesis Negative side is used for shaping the dental prosthesis part by the negative side is placed on the dental prosthesis part to be formed and in particular the negative side to check the shape of the Okklusionsflachen when stacking repeatedly placed on the dental prosthesis to be molded or the negative side is positioned with an open side up so that coating material is coated in the negative side from above.

Further, a model comprising a preparation side model and a model of an antagonist side or a negative side model made according to the method of any one of the preceding claims may be advantageous. Such a model has the aforementioned advantages according to the invention relating to the positioning between the model of the preparation side and the model of the antagonistic side or the negative side.

A further model according to the invention has at least one positioning bearing on the model of the preparation side and at least one positioning support on the model of the antagonistic side, wherein the positioning bearing and the positioning support have positioning surfaces in three spatial directions and wherein a positioning bearing and a positioning support form a bearing the bearing represents a relative position between the preparation side and the antagonistic side. In a further model according to the invention, at least one positioning bearing is provided on a model of the preparation side, and at least one positioning counter-bearing on a model of the negative side, wherein the positioning bearing and the positioning abutment have positioning surfaces in three

Have spatial directions and wherein the positioning bearing and the positioning bearing form the bearing, wherein the bearing reproduces a relative position between the preparation side and the negative side. In contrast to the occlusion contacts which possibly exist additionally between the model of the preparation side and the model of the antagonistic side or the model of the negative side, the positioning bearing and the positioning support have positioning surfaces in three spatial directions, so that an exact and play-free bearing between the preparation side and the negative side is ensured. In total, the positioning surfaces preferably form a pentavalent bearing, which merely has a translational degree of freedom with regard to setting up and setting down.

For this purpose, it may be advantageous if the positioning bearing and the positioning counter additionally or alternatively to the aforementioned features at least one of the following features: They interlock spatially, they have a 3D shape and / or they form a pentavalent bearing. Both the spatial interlocking as well as the 3D shape and the pentavalent bearing are design features that ensure a precise and play-free fit between both sides. It may be advantageous for this purpose, if the model of the negative side is formed without undercuts. Thus, the negative side for the purpose of construction or control of the shape of the dental prosthesis readily on the preparation side and are set off. In the case of an undercut, this would not be the case because the negative side would surround the side surfaces of the neighboring teeth of the preparation site.

It may also be advantageous if the partial height of the negative model is limited by an equatorial line.

BRIEF DESCRIPTION OF THE DRAWING Exemplary embodiments of the invention are illustrated in the drawings. It shows the:

FIGS. 1 a to 1 c show the 3D data record P, A visualized on a screen;

Id and Ie show a model of the preparation side with a model of the antagonistic side attached;

FIG. 2 shows a jaw of the preparation side with preparation site; FIG.

3a-3b show a representation of the 3D data record PZ, NZ of a preparation side and a negative side;

FIG. 3c shows a model of a preparation side with an attached tooth replacement part and a model of the negative side; FIG.

Fig. 3d a model of the negative side with built-in coating material.

FIG. 1a shows, on a screen 10, a visualized 3D data record P of a preparation side 2 with a preparation site 7.1 and two adjacent teeth 7.2, 7.3. In FIG. 1b, the 3D data set A is correspondingly antagonistic. nist side 3 with different antagonists 7.4 - 7.6 shown on the screen 10. Both data sets P, A according to FIGS. 1a and 1b are generated by means of a 3D measuring device with a camera and a corresponding evaluation software. When creating these 3D data records P, A, it is possible to detect occlusion contacts 4, 4 'existing between the preparation side 2 or the adjacent teeth 7.2, 7.3 and the antagonistic side 3 or the antagonists 7.4-7.6. The relative position of the preparation side 2 and the antagonistic side 3 to each other can be determined according to the prior art in various ways. Thus, the antagonistic jaw can be detected by a wax bite in a wax applied to the preparation side, and the wax bite is correlated by the non-wax coated edge areas that are the same in both images.

Alternatively, a small partial uptake of the two jaws in the occluded state is possible, after which the 3D data sets of the preparation side and the antagonist side are correlated. Other methods of assignment can also be used.

In Fig. Ic is on the screen 10, the extension of the existing 3D data sets P, A to Inventory 5.1, 5.2 to see. The two bearings 5.1, 5.2 are provided on the side of the neighboring teeth 7.2, 7.3 or laterally of the antagonists 7.5, 7.6 at an edge R of a selected subregion T of a jaw 7.

The two adjacent teeth 7.2, 7.3 and the two antagonists 7.5, 7.6 represent the surroundings of the preparation site 7.1 on the one hand and the antagonist 7.4 on the other hand. The environment shown here comprises the partial area T of the jaw 7 according to FIG. 2. Depending on the nature and extent of the tooth replacement to be produced, the size of the subarea T, that is to say the number of adjacent teeth 7.1, 7.2 or antagonists 7.5, 7.6 contained therein or the environment, is to be selected. According to FIG. 1c, the preparation side 2 has a first right positioning bearing 2.1 and a second left positioning bearing 2.2, the positioning surfaces 5.3, 5.4 of which are formed as a recess or as a hole. Correspondingly, the antagonistic side 3 has two positioning abutments 3.1, 3.2, whose positioning surfaces 5.3, 5.4 are designed as pins, wherein the positioning counter bearings 3.1, 3.2 engage in the positioning bearings 2.1, 2.2. The respective positioning bearing 2.1, 2.2 has an end-face stop face 2.3, 2.4, against which the positioning counter bearing 3.1, 3.2 strikes in the direction of the respective pin 3.1, 3.2. Thus, the relative position between both sides 2, 3 over the respective pin 3.1, 3.2 and over the stop surface 2.3, taking into account the existing occlusion contacts 4, 4 'determined.

In FIG. 1d, a model 23 of the preparation side 2 with the attached model of the antagonistic side 3 is shown starting from the 3D data sets P, A according to FIGS. The two sides 2, 3 are positioned relative to each other via the two bearings 5.1, 5.2. The model 23 thus formed serves the dental technician as the basis for the preparation of a dental prosthesis part 1, which is placed on the preparation site 7.1.

In Fig. Ie to the alternative embodiment of the pin-hole pairing of the bearings 5.1, 5.2 shown in FIG. Id a tongue and groove pairing. Since trained as tongue and groove pairing bearing 5.1 a pentavalent bearing forms, are at the bearing 5.2, the positioning 2.2 and the positioning bearing 3.2 only formed as a stop surface 2.4.

FIG. 2 shows the preparation side 2 of an entire jaw 7 with the preparation site 7.1. Of the

Subarea T according to FIGS. 1a-Id extends to the two adjacent teeth 7.2, 7.3 of the preparation site 7.1. The two adjacent teeth 7.2, 7.3 thus also form the edge region R of the environment of the preparation site 7.1. FIG. 3 a shows on the screen 10 the visualized SD data record PZ of the preparation side 2 with a virtually attached tooth replacement part 1 '. In addition, a model of the dental prosthesis part 1 '', whose lower edge is not yet adapted to the preparation site 7. 1, formed from a catalog or from a store, is shown in a partial detail 10. 1 of the screen 10. By means of the software, this model of the dental prosthesis part \ "is placed virtually on the preparation site 7.1 and the required geometric data for the dental prosthesis part 1 'are determined.

In FIG. 3 b, starting from the preparation side 2 with attached tooth replacement part 1 ', a 3D data set NZ of a negative side 6 is shown, which at least partly forms the negative of the preparation side 2, the negative side being only a short distance, here up to an equatorial line 7.7, is formed.

The preparation side 2 and the negative side 6 are positioned relative to one another via the two bearings 5.1, 5.2. The existing contact between the two sides 2, 6, in particular in the area of the occlusion surfaces 4, 4 ', has a subordinate significance. The negative side 6 is free of undercuts, ie it has no undercut in a region H on the side surfaces of the adjacent teeth 7.2, 7.3 of the preparation site 7.1. The preparation side 2 also has the two positioning bearings 2.1, 2.2, whose positioning surfaces 5.3, 5.4 are formed as a recess or as a hole, and respectively the stop surface 2.3, 2.4, in which the respective positioning counter 3.1, 3.2 of the negative side 6, whose positioning 5.3 , 5.4 are formed as pins, intervene. The two bearings 5.1, 5.2 are again placed in the edge region R.

FIG. 3c shows a model 26 produced from the data sets PZ, NZ according to FIG. 3b with a model 26.1 of the preparation side 2 and with a model 26.2 of the negative side 6. Between the preparation site 7.1 and the negative side 6, a free space is formed in which the tooth replacement part 1 'to be produced can be used to carry out controls.

Starting from the model 26.1 of the preparation site 7.1, a dental prosthesis part 1 can be built up in a conventional manner by overlaying, wherein at least for checking the final shape of the occlusal surface, the model of the negative side 6 either for shaping itself or at least for checking the shape is used. For this purpose, the negative side 6 via the two bearings 5.1, 5.2 as often removed from the preparation side 2 or placed on this.

For the purpose of constructing the dental prosthesis part 1 on the preparation side 2, the negative side 6 can also be turned over according to FIG. 3d, so that the coating material 8 for the dental prosthesis part 1 to be produced opens from above into an open position 6.3 of the negative side 6 can be introduced for the purpose of shaping the occlusal surface. The partially finished tooth replacement part 1 can then be provided with this coating material 8.

reference numeral

1 dental prosthesis 1 'dental prosthesis 1' 'basic model \' '' partially manufactured dental prosthesis

2 preparation page

2.1 Positioning bearing

2.2 Positioning bearing

2.3 stop surface 2.4 stop surface

3 antagonistic side

3.1 Positioning support, pins

3.2 Positioning support, pins

4 occlusion contact, occlusal surface 4 'occlusion contact, occlusal surface

5.1 storage location

5.2 Storage location

5.3 Positioning surface

5.4 Positioning surface 6 Negative side

6.1 Positioning support

6.2 Positioning support

6.3 open page

7 Pine 7.1 Preparation site

7.2 Neighbor tooth

7.3 Neighbor tooth

7.4 Antagonist

7.5 Antagonist 7.6 Antagonist

7.7 Equator line

8 coating material 10 screen

10.1 Part of the screen

23 model

23.1 Model of the preparation side 23.2 Model of the antagonistic side

26 model

26.1 Model of the preparation side

26.2 Negative side model

A 3D dataset

H area

NZ 3D record

P 3D dataset

PZ 3D dataset

R edge

T subarea

Z 3D dataset

Claims

claims

1. A method for producing a dental prosthesis part (1) based on a 3D data set P of a preparation site (7.1) and its surroundings and on a 3D data set A of an antagonist (7.4) and its surroundings, wherein by means of the 3D data set P a preparation page (2) is defined and by means of the second 3D data set A an antagonistic side (3) is defined and wherein a relative position between the preparation side (2) and the antagonistic side (3) is known, characterized in that on the preparation side ( 2) at least one positioning bearing (2.1) and on the antagonistic side (3) at least one positioning counter bearing (3.1) to the positioning nierlager (2.1) in the respective 3D data set P, A are installed, the positioning bearing (2.1) and the Positioning counter bearing (3.1) Positioning surfaces (5.3, 5.4) in three spatial directions and wherein the positioning bearing (2.1) and the positioning bearing (3.1) form a bearing point (5.1) and d ie

Bearing point (5.1) represents the relative position between the preparation side (2) and the antagonistic side (3).

2. A method for producing a tooth replacement part based on a 3D data record P of the preparation side (2) consisting of the preparation site (7.1) and its surroundings, on a 3D data set Z of the dental prosthesis (1) and on a 3D data set PZ the preparation side (2) with dental prosthesis part {1 ') virtually placed on the preparation site (7.1), characterized in that a) starting from the 3D data set PZ, a 3D prosthesis part Record NZ a negative side (6) of the preparation side (2) with virtually on the preparation site (7.1) attached dental prosthesis (1 ') is generated; b) at least one positioning bearing (2.1) on the preparation side (2) and at least one positioning counter bearing (6.1) to the positioning bearing (2.1) are constructed on the negative side (6), the positioning bearing (2.1) and the positioning counter bearing (6.1) Positioning surfaces (5.3, 5.4) in three spatial directions and wherein the positioning bearing (2.1) and the positioning support (6.1) form the bearing point (5.1), wherein the bearing point (5.1) has a relative position between the preparation side (2) and the negative side (6 ). 3. The method according to claim 1 or 2, characterized in that the preparation side (2) and / or the antagonistic side (3) only a partial area T of a respective jaw (7), wherein the partial area T a maximum of six adjacent teeth (7.2, 7 ,

3) of the preparation site (7.1) and / or the corresponding number of antagonists (7.4 - 7.6).

4. The method according to any one of claims 1 to 3, characterized in that the positioning bearing (2.1) and the positioning counter bearing (3.1, 6.1) at an edge R of the portion T or the preparation site (7.1) are constructed.

5. The method according to any one of claims 1 to 4, characterized in that at least one or three bearings (5.1, 5.2) are provided.

6. The method according to claim 5, characterized in that the bearing points (5.1, 5.2) with respect to the preparation site (7.1) are arranged opposite or that all bearing points (5.1, 5.2) are arranged on one side of the preparation site (7.1).

7. The method according to any one of claims 5 or 6, characterized in that the bearing points (5.1, 5.2) are designed as a pin-hole pairing and / or tongue and groove pairing.

8. The method according to any one of claims 1, 3 to 7, characterized in that a model (23.1) of the preparation side (2) and a model (23.2) of the antagonistic side (3) including the bearing points (5.1, 5.2) is produced.

9. The method according to any one of claims 2 to 7, characterized in that a model (26.1) of the preparation side (2) and a model (26.2) of the negative side (6) including the bearing points (5.1, 5.2) is produced.

10. The method according to claim 9, characterized in that the tooth replacement part (1) is produced by layering, wherein the coating of the dental prosthesis part (1) the negative side (6) for shaping the dental prosthesis part (1) is used by the model (26.2) of the negative side (6) is placed on the model (26.1) of the preparation side (2), wherein the partially coated tooth replacement part (1) in the model (26.1) of the preparation side (2) is arranged.

11. The method according to claim 10, characterized in that the model (26.2) of the negative side (6) for checking the shape of the occlusion surfaces (4) is repeatedly placed on the dental prosthesis part (1) to be formed during the coating.

12. The method according to claim 10, characterized in that the model (26.2) of the negative side (6) with an open side (6.3) is positioned upwards and coating material (8) in the model (26.2) of the negative side ( 6) is coated from above.

13. Model (23), comprising a model (23.1, 26.1) of a preparation side (2) and a model (23.2) of an antagonistic side (3) or a model (26.2) of a negative side (6), produced by the method according to one of the preceding claims.

14. Model (23), comprising a model (23.1) of a preparation side (2) and an antagonistic side (3) of a jaw (7), characterized in that on the

Model (23.1) of the preparation side (2) at least one positioning bearing (2.1) and at least one positioning counter bearing (3.1) are provided on the model (23.2) of the antagonistic side (3), the positioning bearing (2.1) and the positioning counter bearing (3.1) positioning surfaces (5.3, 5.4) in three spatial directions and with a positioning bearing (2.1) and a positioning support (3.1) forming a bearing (5.1), wherein the bearing (5.1) has a relative position between the preparation side (2) and the antagonistic side (3).

15. Model (26), comprising a model (26.1) of a preparation side (2) and a model (26.2) of a negative side (6) of the preparation side (2), characterized in that on the model (26.1) of the preparation side (2) at least one positioning bearing (2.1) and on the model (26.2) of the negative side (6) at least one positioning counter bearing (6.1) is provided, wherein the positioning bearing (2.1) and the positioning counter bearing (6.1) Positioning surfaces (5.3, 5.4) in three spatial directions and wherein the positioning bearing (2.1) and the positioning support (6.1) form the bearing point (5.1), wherein the bearing point (5.1) has a relative position between the preparation side (2) and the negative side (6 ).

16. model (23, 26) according to claim 14 or 15, characterized in that the positioning bearing (2.1) and the positioning support (6.1) additionally or alternatively at least one of the following features:

- spatial interlocking;

a 3D shape;

- formation of a pentavalent camp.

17. model (26) according to claim 15 or 16, characterized in that the model (26.2) of the negative side (6) is formed without undercuts and extends only over a partial height of the model (26.1) of the preparation side (2).

18. Model (26) according to claim 17, characterized in that the partial height of the negative model is limited by an equatorial line (7.7).