EP1881802A2

EP1881802A2 - Method for production of a tooth replacement piece tooth replacement piece and corresponding component and blank

Info

Publication number: EP1881802A2
Application number: EP06755181A
Authority: EP
Inventors: Joachim Pfeiffer; Wilhelm Schneider; Norbert Thiel
Original assignee: Sirona Dental Systems GmbH
Current assignee: Sirona Dental Systems GmbH; Vita Zahnfabrik H Rauter GmbH and Co KG
Priority date: 2005-05-13
Filing date: 2006-05-15
Publication date: 2008-01-30
Also published as: US20060257824A1; WO2006120255A2; CN101217918A; WO2006120255A3; DE102005023106A1; JP2008539920A

Abstract

The invention relates to the production of a tooth replacement piece (1), whereby the tooth replacement piece (1) comprises an at least one-piece skeleton (2) as first component, the skeleton has an outer surface (6) to be faced and the facing is carried out with a separately produced facing piece (3) as a further component with a joint surface (5) optionally generated with interposing of further components (3') for application to the outer surface (6) of the skeleton (2) subsequently fixed to the skeleton (2). Furthermore, a tooth replacement piece (1) produced as above, a component (3) for said tooth replacement piece and a blank (41) for production of such a tooth replacement piece (1) are disclosed.

Description

description

Process for producing a dental prosthesis, dental prosthesis, component and blank for this purpose

TECHNICAL FIELD The invention relates to a method for producing a tooth replacement part, which is constructed from a first component and from a further component, wherein the further component is optionally fastened to the first component with the interposition of further components. As the first component, an at least one-piece framework may be provided, wherein the framework is to be provided with a to be understood as a further component facing. For example, a crown cap should be considered as a single-unit framework, multi-unit frameworks extend over at least two tooth positions.

In a further method, the framework has an outer surface which is to be blended, the veneering being effected by a separately produced veneering part as a further component, which is optionally fastened to the framework with the interposition of further components, wherein between the framework and the veneering part a separating surface is provided, which is formed by the inner surface of the veneer part on the one hand and the outer surface of the frame on the other hand. The invention further relates to a tooth replacement part which comprises an at least one-part framework as the first component, the framework having an outer surface which is veneered and a component for creating a dental prosthesis part, wherein the dental prosthesis part comprises an at least one-unit framework as the first component. Finally, the invention relates to a blank for producing a tooth replacement part composed of at least two components by means of material-removing machining methods. State of the art

Crowns and bridges are made of two materials with different properties, which are related in different ways.

In classical dental technology, crowns and bridges are produced, in which a scaffold is first produced, which is then veneered to achieve an aesthetically high-quality result. The production of the frameworks is done partly by CAD / CAM procedures, but the veneering is done manually. Thus, it is known, in particular, to cast metal frameworks and to veneer these frameworks with a ceramic, the veneering being effected by manual layer-by-layer application of a moist ceramic powder, which is subsequently fired in order to achieve the desired strength. It is also known to overpress scaffolds in a manual operation with a veneering compound.

Furthermore, it is known to apply different-colored ceramic masses automatically in excess to a framework in order to achieve the desired color effect and to reduce it to a form predefined from a CAD data set in a CAM method.

Instead of casting the scaffolds, other manufacturing methods may be used, e.g. CAD / CAM methods. In addition, it is known to use ceramic frameworks. All the above methods have in common that it is a

Nuclear material gives, which is primarily the property the breaking strength optimally fulfilled and a shell material, which takes into account primarily the properties of the aesthetics and the Abrasionsverhaltens against the opposing tooth. The typical shell materials are feldspar-like materials. Typical core materials are metals or oxide ceramics.

Furthermore, it is known to work out crowns of homogeneous ceramic blocks by means of CAD / CAM methods, wherein the blanks may also include a color gradient, whereby the color of the crown produced is somewhat improved.

Presentation of the invention

The basic idea of the invention is to produce a framework part on the one hand and a matching veneering part on the other hand and then to connect them to the tooth replacement part.

In the inventive method for producing a dental prosthesis, which is constructed from a first component and a further component, wherein the further component is optionally attached to the first component with the interposition of further components, the division of the dental prosthesis part takes place in the first and the further component as automatic decomposition according to given design algorithms. In this case, starting from a 3D data record of the preparation site or a model thereof, a complete tooth replacement part is provided as a 3D data record which on the one hand has an outer contour adapted to the preparation site and on the other hand has a connection contour adapted to the preparation site, such that a 3D data record of the first component and an SD record of the other component are generated. This allows the design of both parts in an optimized process.

According to an advantageous development, a separating surface can be generated between the first component and the further component, which is formed by an inner surface of the further component on the one hand and by an outer surface of the first component on the other hand, wherein the course of the parting surface automatically taking into account the required design parameters is determined.

A further method according to the invention for the production of a dental prosthesis part, wherein the dental prosthesis part comprises an at least one unitary framework as the first component and wherein the framework has an outer surface which is to be veneered, consists in that the veneering takes place by means of a separately produced veneering part as a further component , which is optionally attached to the framework with the interposition of further components. Between the framework and the veneer part there is a separating surface which is formed by the inner surface of the veneer part on the one hand and the outer surface of the framework on the other hand, the course of the parting surface being automatically determined by a CAD program taking into account the required design parameters. Again, the construction of both parts is made possible in an optimized sequence.

In a further method according to the invention for producing a tooth replacement part, which is constructed from a first component and from a further component, wherein the further component is optionally fastened to the first component with the interposition of further components, starting from a 3D data set the preparation point is Ie or a model thereof generates the 3D data record for the second component in a CAD process taking into account a 3D data record of the first component for determining a connection surface to the first component and taking into account the 3D data record of the preparation point for determining a Outer contour of the second component, wherein the 3D data set of the first component is virtually set to the present as a 3D dataset preparation point and therefrom a modified 3D data set is generated. In this case, it is not necessary to have a physical

Model e.g. a scaffold, which is introduced into the preparation site and measured together with it, for. to construct a facing piece.

Each of these methods makes it possible to produce dental prosthesis parts consisting of two types of material using CAD / CAM methods that are efficient compared to a mere manual production. The veneering part may itself be multipart, i. it is attached to the scaffolding via an intermediate part. Advantageously, the further component has a contact surface for attachment to the outer surface of the first component. This makes it possible to precisely align the other component on the first component.

Advantageously, the fastening takes place by joining. In this case, the at least two components can be connected to one another by means of a connecting material or joined together by a heat treatment.

Advantageously, the two components are produced in a CAD / CAM process, so that the 3D data sets of the components and the relationship of these to each other without further measurement are known. In a development according to the invention, the two components consist of different materials, whereby an adaptation to different requirements of the individual components is possible. Advantageously, the material of the veneer is aesthetic and the material of the framework is optimized in terms of strength, in the choice of material. An optimization of the design of the components under these aspects is possible. Advantageously, the bonding material is colored to achieve a desired optical effect. The geometric course of the arrangement of the connecting material can also be designed in particular for the design of color effects. Advantageously, a gap is provided between the inner surface and the outer surface which is filled with the bonding material. In this case, the gap can be designed differently thick. Depending on the location, a different coloration of the dental prosthetic item is possible with a colored connecting material. The dimensioning of the gap and the coloring can be part of the CAD process for the construction of the further component.

Advantageously, the material used for the bonding material is glass solder, low-melting ceramic or organic adhesive. In the case of glass solder, the components to be joined are advantageously selected with regard to their expansion coefficients.

It is also possible to use as a connecting material, a material that allows a dyeing eg by exposure to light after mounting. Then it is beneficial to go through Light exposure to make the color matching of the dental prosthesis during or after insertion into the mouth of the patient to achieve optimum color matching to the existing teeth. Another object of the invention is a dental prosthesis, which comprises an at least one-piece framework as a first component, wherein the frame has an outer surface which is blinded. Furthermore, a separately produced facing part as a second component, optionally with the interposition of further, manufactured separately

Components provided with a connection surface for attachment to the scaffold and attached to the scaffold.

Advantageously, the at least two components are interconnected by means of a connecting material. Advantageously, the at least two components are produced in a CAD / CAM process.

Advantageously, the at least two components consist of different materials.

Advantageously, the veneering part is aesthetically optimized and that the framework is optimized in terms of strength.

Advantageously, the connecting means is colored to obtain a desired optical effect.

Advantageously, the material for the bonding layer is glass solder, low-melting ceramic or organic adhesive, and the components to be joined are selected to match each other with regard to their coefficient of expansion.

Advantageously, the at least two components are joined together by a heat treatment. Advantageously, between the first and the second component at least one intermediate part as a third component with a connection surface to the first component on the one hand and with a connection surface to the second component on the other hand arranged.

The connecting material may be colored to achieve a desired optical effect and be arranged in a gap which is designed to be different thickness.

Another object of the invention is a component for creating a dental prosthesis part, wherein the dental prosthesis part summarizes an at least einliedriges scaffold as the first component. For the veneering of the framework, a separately produced facing part is formed as a second component and, optionally with the interposition of further, separately produced components, has a connection surface for attachment to the framework.

Advantageously, the component is produced in a CAD / CAM process.

Advantageously, the component is aesthetically optimized. Advantageously, the material is suitable for bonding with glass solder, low melting ceramic or organic adhesive.

Advantageously, the material is suitable for connection by means of a heat treatment. Another object of the invention is a blank for producing a composite of a first and at least one further component dental prosthesis, which is to be worked out by means of material removing machining process from the blank. The blank consists of a first part of a first material for the first component and a second part of a second material for the further component.

This allows the simultaneous sequential production of both components in one pass in the same processing machine without further intervention by an operator.

Advantageously, provided as material for the first component Al ₂ O ₃ or ZrO and as a material for the second component feldspar ceramic. Both materials are particularly suitable for the respective applications, namely lent for scaffolding on the one hand and for veneering on the other.

In a particularly advantageous embodiment, at least a part of the blank for the production of the dental prosthesis parts of different colors. Together with the colored connection means, a further aesthetic optimization of the final dental prosthetic item can be achieved.

Advantageously, the blank may have a holding part and a blank body connected thereto, which forms the first and second part, wherein the first part is arranged on the holding part and the second part on the first part.

This has the advantage that both components of the dental prosthesis can be manufactured in a single clamping of the blank. Brief description of the drawing

In the drawings, embodiments of the invention are shown. Show it:

Fig. 1 shows a dental prosthesis with a frame and a veneer, the Fig. 2 shows a detail of Fig. 1 in the region of an inner parting surface, the

Fig. 3 shows another tooth replacement part and the

4 a blank with different material properties for the production of the components of a

Tooth replacement part.

embodiments

1 shows a complete dental prosthesis part 1 to be produced in the form of a bridge, which is constructed from a first component in the form of a framework 2 and a second component according to the invention in the form of a veneer 3. Between the veneer 3 and the framework 2 there is a separating surface 4 which is formed by the inner surface 5 of the veneer 3 on the one hand and the outer surface 6 of the framework 2 on the other hand. The course of the

Parting surface 4 is preferably determined automatically by a CAD program taking into account the required design parameters.

The veneer 3 is made of a material that is translucent and allows underlying layers to show through under the veneer 3.

The framework 2 may in turn have an inner surface 7 for attachment to an abutment, not shown, or a dental rest (not shown). The dental prosthesis part 1 can also be more than two parts, for example when an intermediate part 3 'is inserted between the veneering part 3 and the framework. Moreover, in a multi-unit dental prosthesis part, the veneer part can also be divided into individual limbs or groups of adjacent limbs The construction of the framework and the veneer part will, however, usually be designed so that there is only one direction of retraction, so that only one veneer part is necessary. As a rule, it is harmless if parts of the framework remain free, for example the lower part of the bridge member.

In Fig. 2, the course of the parting surface is shown in detail, in which case a connecting layer is provided with a gap 8 between the inner surface 5 of the facing member 3 and the outer surface 6 of the framework 2, which is filled with a connecting means 9.

In order to achieve a defined layer thickness of the connecting layer, a projection 10 can be arranged in the gap 8, which rests on the outer surface 6 with a contact surface 11.

The adhesive 9 may be colored and have a color intensity and / or a coloration which depends on the thickness of the bonding layer. As the layer thickness increases, the color intensity increases and the bond layer appears darker. As the layer thickness decreases, the color intensity decreases and the tie layer appears brighter.

Of course, the connecting means 9 can be present even in different primary colors and be selected in a suitable manner to achieve the desired color effects after introduction into the gap. The colors present in the connecting means 9 shine through the translucent veneer 3.

In Fig. 3, a dental restoration is shown, in which an outer part 33 is placed on an inner part 32. In this case, a gap 8 is filled with a connecting means 9, whose Thickness ti in a lower region is greater than the thickness t ₂ in an upper region.

Via a spacer 10 on the outer part 33, which engages in a corresponding recess 12 on the inner part 32, the outer part is placed on the inner part and set the predetermined distance.

The thickness of the gap 8 and thus of the bonding layer can be adapted by the design software according to the desired color gradient, so that the adhesive is first applied sufficiently when the tooth replacement part is attached. When pressing the outer part 33 to the inner part 32 of the excess adhesive is pushed out of the parting line and can be removed. When pressing is then to ensure that the stop position is actually achieved, so that the predetermined thickness of the bonding layer is also reached and not exceeded.

The connecting means 9 can in principle be organic or inorganic. In the case of an inorganic bonding agent, dyed glass solder can be used as the material, for example.

FIG. 4 shows a blank for the production of a tooth replacement part consisting of a plurality of components, wherein the blank 40 comprises a holding part 41 for fastening in a processing machine (not shown) and a blank body 42 connected to the holding part 41.

The blank body 42 has two adjoining partial regions 43, 44, which have a different material composition, the partial region 43 being arranged between the holding part 41 and the partial region 44. The difference of the material composition can be in the optical Properties, for example, the color or translucency, but in particular in the strength values, so that a component of a multi-part dental prosthesis part of the one material of the portion 43 and another component of the other material of the portion 44 in a single setting without changing the Workpiece can be produced. For this purpose, a relative movement of a tool 45 in the direction of the arrows 46, 47 on the blank body 42 can be carried out. The schematic procedure of the method will be explained below. The starting point are CAD data sets that describe the tooth restoration to be created in the form of a core and a shell.

The data set for the scaffold as the first component can be generated by measuring an existing scaffold. However, the data record can also be generated by a CAD process by constructing a framework on a preparation site or a model thereof as a data record.

The dataset for the veneer part as the second component is generated in a CAD process, starting from the dataset for the framework for determining the connection surface to the framework and the dataset of the preparation site for determining the outer contour. It is possible to generate a data set by means of the scaffolding arranged in the preparation site (core part) or to set the scaffold only virtually on the preparation site present as a data record and to generate a data record therefrom.

Alternatively, starting from the data set of the preparation site or a model thereof, a complete dental prosthetic item can be constructed, ie with the outer contour on the one hand and the connection contour to the preparation. Onsstelle on the other hand, and only then the tooth replacement part is divided into a first and a second component for the core or the frame and the shell or the veneer part. This division can take place automatically.

Subsequently, in a CAM process, the two molds are made from the materials suitable therefor, the top side of the core being the negative of the underside of the casing and a gap of only a few between the two molds to compensate for the tolerances and to introduce a joining material 10 μm.

This is followed by the permanent connection of the two parts. There are different connection techniques conceivable.

The placement of the shell on the surface-treated core part and heating to just below the melting point of the shell part leads to a melting on the core part.

Alternatively, spraying the core member with a low melting ceramic in a thin uniform layer and then placing the sleeve member may occur. The heating to above the melting point of the sprayed ceramic leads to the connection of the shell part and the core part. The spraying can be done with a spray with ceramic powder.

Instead of spraying with a low-melting ceramic, a glass solder or metal solder or another inorganic agent can also be added to the joint gap.

All such compounds typically involve a temperature treatment in which the result is temperature-resistant, that is, for example, can be exposed to further heat treatment processes such as glazing. Furthermore, it can also be added with an organic adhesive. This is then cured either chemically or by light.

The color and translucency of the joining material can be deliberately chosen to optimize the overall impression of the restoration. The shape of the joint gap can also be used for the purpose of optimizing the aesthetic result. It is also conceivable that a joining material is used, which is discolored by subsequent exposure to light. The process can be assisted by special blanks in which the two materials for the core part and the shell part are placed on a holder, so that both parts can be ground by the machine without further user interaction. However, such a blank is not a mandatory requirement for carrying out the method, which also works with multiple blanks, but at a lower level of automation.

A rule according to which the overall picture is divided into scaffolding and veneering can be the scaffolding with the same

Layer thickness and relatively thin form, for example, 0.5 mm, which has the advantage that the largest possible part of the dental prosthesis part consists of aesthetically suitable material. Another rule, according to which the overall image is distributed in framework and veneer, may be to form the veneer with approximately the same layer thickness and relatively thin, eg 1 mm, which has the advantage that there are fewer stresses in the less solid material of the veneer part. to step. In addition, intermediate ranges of the rules can be used, which are varied by hand in a CAD software, for example.

As the material for the first part 43 of the blank, Al 2 O ₃ or ZrO may be used as material for the second part 44

Feldspar ceramic or a comparable glass ceramic, in particular leucite-containing glass ceramic, be provided.

Claims

claims

1. A method for producing a complete tooth replacement part (1), which is composed of a first component (2) and of a further component (3), wherein the further component (3) optionally with the interposition of further components (3 ') on the first Component (2) is fixed, characterized in that starting from a 3D data set of the preparation site or a model thereof a complete tooth replacement part (1) is provided as a 3D data set, which on the one hand adapted to the preparation site outer contour and on the other hand one to the preparation site has adapted connection contour, wherein the division of the dental prosthesis part (1) in the first and the further component (2, 3) takes place as an automatic decomposition according to predetermined design algorithms and thus a 3D data set of the first component and a 3D data set of the other component are generated ,

2. The method according to claim 1, characterized in that between the first component (2) and the further component (3) a separating surface (4) is generated, which of an inner surface (5) of the further component (3) on the one hand and of an outer surface (6) of the first component (2) is formed on the other hand, wherein the course of the parting surface (4) is set automatically taking into account the required design parameters.

3. A method for producing a dental prosthesis (1), wherein the dental prosthesis (1) comprises an at least einliedri- scaffold (2) as the first component and wherein the frame has an outer surface (6) to be blended, wherein the blending a separately manufactured tes Verblendteil (3) takes place as a further component, which is optionally attached to the frame (2) with the interposition of further components (3 '), wherein between the frame (2) and the veneer part (3) a separating surface (4) is present, which of the inner

Surface (5) of the veneer part (3) on the one hand and the outer surface (6) of the framework (2) on the other hand is formed, characterized in that the course of the parting surface (4) by a CAD program automatically determined taking into account the required design parameters ,

4. A method for producing a complete tooth replacement part (1), which is composed of a first component (2) and of a further component (3), wherein the further component (3) optionally with the interposition of further components (3 ') on the first Component (2) is fastened, characterized in that starting from a 3D data set of the preparation site or a model thereof, the 3D data set for the second component is generated in a CAD process taking into account a 3D data set of the first component Determining a connection surface to the first component and taking into account the 3D data set of the preparation site for determining an outer contour of the second component, wherein the 3D data set of the first

Component set virtually on the present as a 3D dataset preparation point and from it a modified 3D data set is generated.

5. The method according to any one of claims 1 to 4, character- ized in that the further component (3) has a contact surface (11) for attachment to the outer surface (6) of the first component (2).

6. The method according to any one of claims 1 to 5, characterized in that the at least two components (2, 3) by means of a connecting material (9) are interconnected.

7. The method according to any one of claims 1 to 6, characterized in that the at least two components (2, 3) are produced in a CAD / CAM process.

8. The method according to any one of claims 1 to 7, characterized in that the two components (2, 3) consist of different material.

9. The method according to claim 3 and 8, characterized in that the material of the veneer part (3) is aesthetically optimized and that the material of the framework (2) is optimized in terms of strength.

10. The method according to any one of claims 6 to 9, characterized in that the connecting material (9) is colored to achieve a desired optical effect.

11. The method according to any one of claims 6 to 10, characterized in that between the inner surface

(5) and the outer surface (6), a gap (8) is provided which is filled with the bonding material (9).

12. The method according to claim 5 and 11, characterized marked, that the gap (8) is configured differently thick.

13. The method according to any one of claims 6 to 12, characterized in that for the connecting material (9) glass solder, low-melting ceramic or organic adhesive is used.

14. The method according to any one of claims 6 to 13, characterized in that the connecting material (9) is additionally discolored after fastening.

15. The method according to any one of claims 1 to 14, characterized in that the at least two components (2,

3) are joined together by a heat treatment.

16. tooth replacement part, which comprises an at least one-part frame as the first component (2), wherein the frame has an outer surface (6), which is veneered, characterized in that a separately manufactured veneer part (3) as a second component, optionally under Interposition of further, separately manufactured components (3 '), provided with a connection surface (5) for attachment to the scaffold and to the framework (2) is attached.

17. tooth replacement part according to claim 16, characterized in that the at least two components (2, 3) by means of a connecting material (9) are interconnected.

18. Dental prosthesis according to claim 16 or 17, characterized in that the at least two components (2, 3) are produced in a CAD / CAM process.

19. Dental prosthesis according to one of claims 16 to 18, characterized in that the at least two components (2, 3) consist of different materials.

20. Dental prosthesis according to claim 19, characterized in that the material for the veneer part (3) is aesthetically optimized and that the material for the framework (2) is optimized in terms of strength.

21. Dental prosthesis according to one of claims 17 to 20, characterized in that the connecting material (9) is colored to achieve a desired optical effect.

22. Dental prosthesis according to one of claims 17 to 21, characterized in that the connecting material (9) is glass solder, low-melting ceramic or organic adhesive.

23. Dental prosthesis according to one of claims 16 to 22, characterized in that the at least two components (2, 3) are joined together by a heat treatment.

24. Dental prosthesis according to one of claims 16 to 23, characterized in that between the first and the second component (2, 3) at least one intermediate part (3 ') as a third component with a connection surface to the first component (2) on the one hand and with a connection surface to the second component (3) on the other hand is arranged.

25. Dental prosthesis according to one of claims 16 to 24, characterized in that the connecting material (9) is colored to achieve a desired optical effect.

26. Dental prosthesis according to one of claims 16 to 25, characterized in that the connecting material (9) in a gap (8) is arranged, which is designed differently thick.

27. Component for creating a dental prosthesis (1), wherein the dental prosthesis is an at least one-piece framework

(2) as the first component, characterized in that it is designed as a second component for the veneering of the framework (2) as a separately produced veneering part (3) and, optionally with the interposition of further separately produced components (3 '), egg- ne connection surface (5) for attachment to the frame (2).

28. Component according to claim 27, characterized in that it is produced in a CAD / CAM process.

29. Component according to claim 27 or 28, characterized in that it is aesthetically optimized.

30. Component according to one of claims 27 to 29, characterized in that the material is suitable for connection with glass solder, low-melting ceramic or organic adhesive.

31. Component according to one of claims 27 to 30, characterized in that the material is suitable for connection by means of a heat treatment.

32. Blank for producing a tooth replacement part (2, 3) composed of a first and at least one further component by means of material-removing machining methods, characterized in that a first part (43) of the blank (42) consists of a first material for the first component (2) and a second part (44) of the blank consists of a second material for the further component (3).

33. Blank according to claim 32, characterized in that as material for the first part (43) Al ₂ O ₃ or ZrO and as material for the second part (44) feldspar ceramic or a comparable glass ceramic, in particular leucitaltige glass ceramic, is provided.

34. Blank according to claim 32 or 33, characterized in that the part (44) for the production of the second component (3) has areas (44.1 - 44.3) of different colors.

35. Blank according to one of claims 32 to 34, characterized in that the blank (40) has a holding part (41) and an associated blank body (42) which forms the first and second part (43, 44), wherein the first part (43) on the holding part (41) and the second part (44) on the first part (43) is arranged.