SE523022C3 - Procedure and apparatus for a dental restoration - Google Patents

Description

5 30 523 022 2 the environment in the form of adjacent teeth and opposite teeth. This information is used as a basis when a user designs the restoration via interactive work at a terminal, and thus creates the mathematical model of the restoration in the computer. An alternative way to solve the design problem is to sculpt the restoration in wax, clay or similar materials, scan both the prepared tooth and the sculpted restoration, correlate the different scans with each other and from this information create a 3D model of the restoration.

In the prior art, the inner part of the restoration can be degenerated by the degeneration of the scanned surface of the prepared tooth, or a simple displacement of said surface, as the inner surface of the restoration.

There are a number of disadvantages to the design methods described above: First, both require quite a lot of operator time. Secondly, in the method of growing up, there is still a dependence on traditional labor-intensive craft work, and thirdly, this work has in the later procedure been replaced by a new type of labor-intensive work in front of the computer, with the design of the restaurant by clicking and drag operations with the mouse. Fourth, models created today are not always possible to manufacture in the next step. Most dental CAD / CAM systems use a CNC machine for manufacturing. Such a machine can use tools of different types, dimensions and geometric shapes. Tools with a larger diameter are usually used at the beginning of the machining sequence to remove a lot of material, while tools with a smaller diameter are used for finishing. Even if very small tools are used, there can always be pockets in the restaurant into which the tool cannot enter. In these cases, materials will be left behind, and more manual finishing work will be required to make the restoration workable. SUMMARY OF THE INVENTION The object of the present invention is to develop a method and an apparatus for creating a three-dimensional data model of a tooth restoration or a part thereof with reduction of the amount and the intensity of the required manual work steps when creating a dental restoration.

This is accomplished by the use of a method for generating a three-dimensional data model of a dental restoration or a part thereof, wherein the data model is intended to be used in a manufacturing process for said restoration comprising the steps of storing information representing the external shape of a preparation. generating a data model of the preparation, and registering and / or storing at least one value for at least one restoration parameter which denotes the position of the restoration relative to the position of the preparation in a configuration consisting of the restoration and the preparation, said preparation comprising a preparation limit.

The method and device according to the invention have the following advantages: It is possible to register, store and use restoration parameters which reduce the required operator time. Furthermore, these parameters are quickly entered by the operator. In addition, the steps according to the invention also require less handing over by a person designing the restaurant. In addition, the restoration can be designed in such a way that the porcelain of a crown has a more or less even thickness, which is advantageous in relation to mechanical strength.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which: - fi g. 1 shows a schematic side view of a plaster model of a prepared tooth, 10 15 20 25 »523 022 4 n-» nun - fi g. 2 shows a schematic side view of a model of a jaw, - fi g. 3 shows a schematic side view of a model of the prepared tooth, - fi g. 4 shows a schematic side view of a model of the prepared tooth, and schematically a computer comprising a processor and a memory, - fi g. 5 shows a schematic, partly sectioned side view of a model of the prepared tooth and a restoration, - fi g. 6 shows a perspective view of a model of the prepared tooth, - fi g. 7 is an illustration of the explanation of an algorithm according to a preferred embodiment of the present invention, - fi g. 8 shows a part of a restoration and a part of a manufacturing tool, and - fi g. 9 also shows a part of a restoration and a part of a manufacturing tool.

DETAILED DESCRIPTION OF EMBODIMENTS In the drawings, fi g. 1 schematically shows the occlusion part of a plaster model 2 of a prepared tooth, i.e. a dental preparation. The plaster model 2 of the prepared tooth can be obtained by making an impression of the prepared tooth at the dentist, in some known manner. In addition to plaster, any other suitable material can be used. The boundary 4 between the prepared part 6 at the upper part of the tooth and the unprepared part 8 is usually known as the preparation boundary 4.

As shown in ñg. 2, it is also possible to use a model of a full jaw 10 comprising a model of the prepared tooth 2 and models of the surrounding teeth 12, 14, 16, 18, 20 in the method of generating a three-dimensional data model of tooth restoration. 50 or a part thereof where the computer model is intended to be used in a manufacturing process for said restoration 50. The models of the different teeth are separate from each other and releasably attached to the model of the jaw 10. In this way the model of the prepared tooth 2 and the models of the surrounding teeth 12, 14, 16, 18, 20 are removed and put back into sockets (not shown) in the model of the whole jaw (10) without changing their relative positions in space with respect to the model of the jaw 10 when they are placed their respective sockets.

As shown in fi g. 3, the gypsum model 2 is cut below the preparation boundary 4 before creating the three-dimensional data model of the preparation, so that an undercut area 30 is created there. In this way, the undercut area 30 is hidden when the plaster model is seen from above.

Thereafter, the plaster model 2 is scanned to collect data on the topology of the preparation 2, in some known manner, and information representing the external form of a preparation 2 can be stored in a memory 42 in a computer 44, whereupon a data model 40 of the preparation the ration 2 which comprises the part of the preparation 2 on the occlusion side of the preparation boundary 4, as shown in fi g. 4, can be generated by a processor 46 in the computer 44.

The data model 40 is built up of dental lines (not shown) that can be manipulated individually to create the desired shape in a known manner. In the data model, a reference axis R is determined, the direction of which corresponds to the insertion axis of the restoration to be manufactured, in relation to the preparation.

As shown in Fig. 5, the inner surface of a restoration 50, preferably intended as a structure for a crown, is generated in the computer 44 by the processor 46 by displacing the surface of the data model 40 of the preparation 2, the distance of the displacement being determined by enter values for gap parameters, which will be described further, as well as the steps of registering and / or storing in the memory 42 at least one value for at least one restoration parameter h1, h2, h3, h4, h5, gl, g2 which defines the position of the restoration 50 in relation to the position of the preparation 2 in a configuration consisting of the restoration 50 and the preparation 2, wherein said preparation 2 comprises a preparation limit 4, and the use of the at least one registered and / or stored value of the at least one restoration parameter h1, h2 , h3, h4, h5, gl, g2 for the generation in the processor 46 of the data model of the restoration 10 15 20 25 30 “523 022 6 aw a - n 50. The space 60 between the restoration 50 and preparation 2 is intended to be filled with cement to secure the restoration to preparation 2.

A first part P1 of the preparation 2 is defined as follows: The jaw end of the outer surface of the first part P1 is delimited by a first line L1, which is located at a distance h1 from the preparation boundary 4. The value h1 is stored in the memory 42 in the computer 44, el clay is indicated by an operator, with hl preferably being about 1200 μm. The occlusion end of the first part P1 is the same as the occlusion end surface of the preparation.

A second part P2 of the preparation is defined as follows: The jaw end of the outer surface of the second part P2 is delimited by the preparation boundary 4. The occlusion end of the surface of the second part P2 is delimited by a second line L2, which is located at a distance h2 from the preparation boundary The value of h2 is stored in the memory 42 of the computer 44, or is specified by an operator, the h2 preferably being about 800 μm.

A third part P3 of the preparation is defined as follows: The jaw end of the outer surface of the third part P3 is delimited by the second line L2. The occlusion end of the surface of the third part P3 is delimited by the first line L1.

For the first part P1, the inner surface 52 of the restoration 50 is generated by the processor 46 by defining a first gap g1 between the preparation 2 and the restoration 50, the first gap g1 being constant around the first part P1. Preferably, the first gap gl is about 60 μm. Preferably, the inner surface of the restoration 50 for the second part P2 is generated by the processor 46 by making it correspond to the outer surface of the preparation 2. Alternatively, the same algorithm is used as for the inner surface of the restoration in the first part P1 as described above. When the algorithm is used for the second part P2, either a value is stored in the memory 42 of the computer 44 or it is specified by an operator of the computer 44. For the third part P3, the inner surface of the restoration 50 is generated by the processor 46 using the first gap gl at the first line L1 and the second gap g2 at the second line L2 so that the distance between the preparation 2 and the restoration 50 decreases linearly from the first line L1 to the second line L2. Alternatively, a non-line change of said distance may be arranged between the first line L1 and the second line L2. Thus, the restoration parameters include parameters h1, h2, gl, g2 which define the distance g1 between the outer surface of the preparation and the corresponding surface of the restoration at a first part of the configuration consisting of the restoration 50 and the preparation 2, and the distance g2 between the outer surface of the preparation 2 and the corresponding surface of the restoration 50, at a second part of the configuration consisting of the restoration 50 and the preparation 2, and the distance h1 defining the beginning of the first part of the preparation 50 in relation to the preparation boundary 4 of the preparation 50. the distance, seen from the preparation boundary 4, and the distance h2 which they slutet n the end of the second part of the preparation 2 in relation to the preparation boundary 4 of the preparation 2 in relation to the preparation boundary 4 of the preparation, seen from the preparation boundary 4.

Fig. 6 illustrates a preferred algorithm for generating the first line L1. An arbitrary point PM at the preparation boundary 4 is the center of a sphere S, with the radius hl. The location of a point PL on the first line L1 is determined as the position of the intersection between the sphere S, the surface of the preparation 2 and a plane P, which coincides with the reference axis R and the point PM at the preparation boundary 4. For a finite number of points at preparation limit 4, the position of the same number of points defining the first line L1 is determined. The line L2 can be generated in a corresponding manner.

Referring to Fig. 7, a displacement axis 0, for an arbitrary point PP on the surface of the preparation 2, is preferably determined by the processor 46, the direction of which is perpendicular to the surface of the preparation, and which intersects the point PP. The position of a point PR of the inner surface 52 of the restoration 50 is determined by the processor 46 to be on the displacement axis 0, at a distance corresponding to the first gap g1. The second gap g2 can be generated in a corresponding manner. o m0-- a l0 15 20 25 30 523 ozz ¿, ¿, ¿,,. - ... n 8 F ig. 8 illustrates a problem that may arise during the manufacture of the restoration 50.

Tools for making the restoration 50 may include cylindrical tools having a spherical tool end having a radius equal to half the tool diameter, or cylindrical tools having a tool end having rounded ends having a radius less than half the tool diameter. It is also possible to use other types of tools. If a cavity 54 in the model of the restoration has a radius smaller than a change radius of a tool T, which has been used during manufacture to mill out of the restoration 50, the tool T will not be able to reach into the cavity and take remove a sufficient amount of material to obtain the desired surface of the restoration 5. According to the invention, as shown in fi g. 5, the cement space is increased in this case to enable the smallest available tool to remove the required amount of material. Preferably, a dimension of the tool T, or the smallest radius of curvature of a concave surface that can be achieved during the manufacturing process, is recorded or stored in the memory 42 of the computer 44. Small radius cavity areas 54 are identified in the data model 54 with small radii includes a cavity, recess or concave portion, at which radii of curvature are less than the smallest radius of curvature obtainable during the manufacturing process. With reference to fi g. 8, the surfaces at the cavity areas 52 with small radii are preferably regenerated in the data model of the restoration 50 of the processor 46, so that the surface obtains a radius of curvature which is substantially equal to, or slightly greater than, the tool radius. The regenerated surface is completely located outside the original surface, which gives a larger cement space locally.

As these changes to the surface are usually made at the top of the restorations, this extra space is clinically acceptable. To avoid this type of extra cement space near the connection edge, a function is provided that allows the processor 46 to control the distance to the connection edge and prevent surface changes below a distance h3 from the connection edge. The h3 parameter is configurable. The restoration parameters thus comprise a parameter that defines at least one dimension, e.g. a change radius, of at least one material removal tool T to be used in the manufacturing process to remove material, and / or the smallest a nu .. 10 15 20 25 30. uu ounn e. h nu n ~ a a. ue ef '-2 "Û 0 -o -1 uuas. .- ....: n: ~. a.... ._ ai.. aau ,, , the radius of curvature of a concave surface which can be obtained during the manufacturing process with a material removal tool T. At least one small radius cavity area in the computer node, which comprises a cavity, recess or concave portion, is identified by the processor 46 at which area at least one radius of curvature is less than the smallest radius of curvature that can be achieved during the manufacturing process, and the surface is adjusted at the at least one cavity area with a small radius, so that the surface has no any radius of curvature that is less than the minimum radius of curvature that can be achieved during the manufacturing process with the material removal tool T.

The step of adjusting the surface at the at least one cavity area with a small radius comprises extending the surface so that the extent of the data model, at the at least one cavity area with a small radius, is not greater than the extent of the data model, at the at least one cavity area with a small radius radius, before performing the step of adjusting the surface at the at least one small radius cavity area.

A simple hood restoration is characterized by the uniform thickness of the entire restoration. This shape is relatively easy to achieve because it is a displacement of the preparation surface. The reduction of the crown is uniform and will give the dental technicians an excellent basis for porcelain work. When a tooth is in poor condition, it is sometimes necessary to remove quite a lot of the tooth. When a simple hood is made for this type of preparation, it will be a very thick and uneven layer of porcelain that builds up the crown. Since porcelain is much weaker than the cap, or core, this will affect the strength of the final restoration. It can also become aesthetically unattractive. In some cases, when modern leucite porcelain is used, it is not even possible to use the simple cap as it will locally need a thickness of the porcelain layer that is outside the manufacturer's specification. It is also time consuming to build a crown that requires a lot of porcelain because the different layers may need to be burned one after the other in an oven. 10 15 20 25 P2; Thus, the outer surface of the restoration is generated by the processor 46 using the following method to generate a three-dimensional data model of a tooth restoration 50 or a part thereof, the data model being intended to be used in a manufacturing process for said restoration. 50, comprising the steps of: First, recording, and / or storing, preferably but optionally, information about the external shape of at least a portion of at least one adjacent tooth, or adjacent teeth, or portions thereof, or opposite tooth or teeth 16, 18, respectively. , 20, in a memory 42 in the computer 44.

Preferably, but optionally, the entire jaw 10 with the prepared tooth 2 and the adjacent teeth 12, 14, 16, 18, 20 is used in a first scan set. This scan set is used to provide the operator with information about the size, shape and position of the teeth surrounding the prepared tooth. This set can be displayed on the screen along with the preparation scan to provide information and then turned off, as it may otherwise interfere with the design of the restoration.

The holder is removed from the scanner and the neighboring teeth are removed from the sockets.

The holder is inserted into the scanner and the prepared tooth is scanned, thus storing information in the memory 42 regarding the topology of the prepared tooth. By using an absolute reference system for the holder, it can be reinserted without losing orientation.

An area of interest in the surface of the tooth reconstructed for preparation is selected by the user and the area is recalculated at higher resolution to reduce the amount of data handled to improve the speed when the surface is manipulated on the screen. 10 15 20 25 30: uu uuu u u ua u. Uu u. U nuuu u u u u u u u u u u n u uu. u u u u u u u u u u u u uu u u uu u u u u u u u u u u u u. u u u u u u u u u u u u. . ,. ucuuu ».u uu o> ouuu ll For each tooth, a template, made up of dental lines (not shown) and which is an image of a complete crown, is stored in the memory 42. A template corresponding to the tooth is loaded and adjusted automatically to attached to preparation boundary line one.

The restoration parameters include at least one connection edge parameter h3, which can assume a value associated with a close edge design type, selected from a predefined set of close edge design types, each indicating a separate type of restoration design at an end region thereof, at the connection edge.

The following describes some predefined edge designs: In a knife edge type edge, the cap is very thin near the connection edge and no cap material will be visible.

In a cut-type edge, the cap does not extend all the way down to the connecting edge to allow for porcelain.

In a collar-type edge, a band of cap material is visible all the way around the crown, and in an edge of an extended type, the band of cap material has a greater extent.

Edge of the knife edge type or of the cut type is often used at the cheek in the mouth to allow for porcelain, and edges of the collar type or of the extended type are used at the tongue to make the crown stronger.

The template can now be manipulated by the user using mouse movements.

The shape and size can be adjusted to match the neighboring teeth and an angle in the horizontal plane can be adjusted to align the tooth with the surrounding teeth.

Second, a value h4 indicating the desired thickness of an outer layer, intended to be located outside the restoration 50, is recorded or stored in the memory 42.

Third, at least a portion of the outer surface of the outer layer is generated by the data operator using at least a portion of the information recorded and / or 523 0202 12 .. _. ... stored in the step of registering and / or storing information in the external form of at least a part of at least one neighboring tooth and / or opposite tooth. The area of the crown is calculated using the dental lines and the crown is visualized on the screen.

A value for the outer storage parameter h4 is recorded and / or stored in the memory 42.

Fourth, at least a portion of the outer surface of the restoration 50 is generated, using the value of the desired thickness, i.e. the outer layer thickness parameter h4 and the outer surface of the outer layer, of the processor 46 by an algorithm corresponding to that described above with reference to fi g. 7.

The internal parameters are selected together with a reduction distance. A new outer surface is calculated by the processor 46 using the reduction distance and the crown surface.

The reduction has a minimal thickness, e.g. 0.5 mm, which is maintained even if the reduction of the crown has resulted in a smaller thickness.

The reduced crown solves the problem of a too thick layer of porcelain because the outer shape is a uniform displacement of the final crown.

Alternatively, a value for the restoration thickness h5 is stored or recorded in the memory 42, and, using the information about the inner surface of the restoration 5, the outer surface of the processor 46 is generated by an algorithm corresponding to that described above with reference to fi g. 6.

The restoration parameters h1, h2, h3, h4, hS, gl, g2 comprise an outer layer thickness parameter h4, intended to assume a value indicating the desired thickness of an outer layer, intended to be placed outside the restoration. The restoration parameters h1, h2, h3, h4, h5, gl, gZ comprise a restoration thickness parameter h5, intended to assume a value indicating the desired thickness of at least a part of the restoration 50.

What has been said above about restoration 50 can be applied to other types of dental restorations as well, Lex. crowns, bridges, pillars (English: pillars), facades (English: veneers), implant components, etc.

Claims (16)

10 15 20 25 523 022 14 PATFNTKRJÅV A method for generating a three-dimensional data model of a dental restoration (50) or a part thereof, wherein the data model is intended to be used in a manufacturing process for said restoration (50), comprising the steps of: storing information representing the external form of a preparation (2), generating a data model of the preparation (2), which method is further characterized by the steps of: registering and / or storing at least one value for at least one restoration pair network (h1, h2, h3, h4, h5, gl, g2) defining the position of the restoration in relation to the position of the preparation in a configuration consisting of the restoration and the preparation, wherein said preparation comprises a preparation limit (4), and using the at least one registered and / or stored value for the restoration at least one restoration parameter (hl, h2, h3, h4, h5, gl, g2) for the generation of the data model of the restoration (50). The method of claim 1, wherein the restoration parameters comprise parameters (h1, h2, h3, h4, h5, gl, g2) defining: the distance (gl) between the outer surface of the preparation and the corresponding surface of the restoration (50). ) at a first part of the configuration consisting of the restoration and the preparation (2), and the distance (g2) between the outer surface of the preparation (2) and the corresponding surface of the restoration (50), at a second part of the configuration which consists of the restoration (50) and the preparation (2), and furthermore the distance (hl) which defines the beginning of the first part of the preparation in relation to the preparation limit (4) of the preparation (2), seen from the preparation limit (4) , and the distance (h2) defining the end of the second part of the preparatiozieri (2) in relation to the preparation limit (4) of the preparation (2), seen from the preparation limit (4). A method according to claim 1 or 2, wherein the restoration parameters comprise a parameter that they fi deny at least one dimension, Lex. a change radius, of at least one material removal tool (T) to be used in the manufacturing process to remove material, and / or the smallest radius of curvature of a concave surface that can be achieved during the manufacturing process with a material removal tool (T), which method further comprises the steps to - identify at least one cavity area with a small radius in the data model, which includes a cavity, recess or concave part, in which at least one radius of curvature is less than the smallest radius of curvature that can be achieved during / / during the manufacturing process, and f / adjusting the surface at the at least one cavity area with a small radius, so that the surface has no radius of curvature smaller than the smallest radius of curvature that can be achieved during the manufacturing process with the material removal tool (T). The method of claim 3, wherein the step of adjusting the surface at the at least one small radius cavity area comprises moving the surface so that the extent of the data model, at the at least one small radius cavity area, is not greater than the extent of the data model, at the least one cavity area with a small radius, before performing the step of adjusting the surface at the at least one cavity area with a small radius. A method according to any one of the preceding claims, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, g2) comprise at least one connection edge parameter (h3), which can assume a value associated with a near-edge design type, which is selected from a pre-defined set of near-edge design types, each of which indicates a 10 15 20 25 a u ... A method according to any one of the preceding claims, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, g2) comprise an outer layer thickness parameter (h4), intended to assume a value indicating the desired thickness of an outer layer (70), intended to be placed outside the restoration (50), further comprising the steps of - registering and / or storing information about the external shape of at least a part of at least one adjacent tooth (12, 14) and / or opposite tooth (16, 18, 20), generating at least a part of the outer surface of the outer layer (70), wherein at least a part of the information, recorded and / or stored in the step of registering and / or storing information about the outer shape of at least a part of at least a neighboring tooth and / or opposing tooth is used, - recording and / or storing a value for the outer layer thickness parameter (h4) and - generating at least a part of the outer surface of the restoration (50), the value for the outer layer thickness parameter (h4), and the outer surface of that outer layer (70) is used. A method according to any one of the preceding claims, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, g2) comprise a restoration thickness parameter (h5), intended to assume a value indicating the desired thickness of at least a part of the restaurant (50). A method according to any one of the preceding claims, wherein the restoration (50) is a reduced crown. An apparatus for generating a three-dimensional data model of a dental restoration (50) or a portion thereof, the data model being intended for use in a manufacturing process for said restoration (50), comprising: 10. 17 .. ... means (42) for storing intormation representing the outer form of a preparation (2), means (44) for generating a data model of the preparation (2), which device is further characterized by: means (42) for recording and / or store at least one value for at least one restoration parameter (h1, h2, h3, h4, h5, gl, g2) which defines the position of the restoration (50) in relation to the position of the preparation (2) in a configuration consisting of the restoration (50) and the preparation (2), wherein said preparation (2) comprises a preparation limit (4), and means (46) for using the at least one recorded and / or stored value of the at least one restoration parameter (hl, h2, h3, h4, h5, gl, g2) for the generation of the data model of the restoration (50). lO. Device according to claim 9, wherein the restoration parameters comprise parameters (h1, h2, h3, h4, h5, gl, g2) which define: the distance (gl) between the outer surface of the preparation (2) and the corresponding surface of the restoration (50). ) at a first part of the configuration consisting of the restoration (50) and the preparation (2), and the distance (gZ) between the outer surface of the preparation (2) and the corresponding surface of the restoration (50), at a second part of the configuration consisting of the restoration (50) and the preparation (2), and furthermore the distance (hl) defining the beginning of the first part of the preparation (2) in relation to the preparation limit (4) of the preparation (2), seen from the preparation limit ( 4), and the distance (h2) defining the end of the second part of the preparation (2) in relation to the preparation limit (4) of the preparation, seen from the preparation limit (4). An apparatus according to claim 9 or 10, wherein the restoration parameters comprise a parameter defining at least one dimension, e.g. a change radius, of at least one material removal tool (T) to be used in the manufacturing process to remove material, and / or the minimum radius of curvature. of a concave surface which can be produced during the manufacturing process with a material removal tool (T), which device further comprises - means (44) for identifying at least one cavity area with a small radius data model, which comprises a cavity, recess or concave part, at which at least one radius of curvature is less than the minimum radius of curvature that can be achieved during the manufacturing process, and - means (46) for adjusting the surface at the at least one cavity area with a small radius, so that the surface has no radius of curvature less than the smallest radius of curvature that can be achieved during the manufacturing process with the material removal tool (T). The device of claim 11, wherein means (46) for adjusting the surface at the at least one small radius cavity area comprises means (46) for moving the surface so that the extent of the data model, at the at least one small radius cavity area, , is not greater than the extent of the data model, at the at least one small radius cavity area, before performing the step of adjusting the surface at the at least one small radius cavity area. Device according to any one of claims 9 to 12, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, gZ) comprise at least one connection edge parameter (h3), which can assume a value associated with a close-edge design type, which is selected from a pre-defined set of near-edge design types, each of which indicates a separate type of design for the restoration at an end area thereof, at the connection edge. The device according to any one of claims 9 to 13, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, g2) comprise an outer layer thickness parameter (h4), intended to be placed outside the restoration (50), further comprising means (42) for registering and / or storing information about the external shape of at least a part of at least one adjacent tooth (12, 14) and / or opposite tooth (16, 18, 20), - means (44) for generating at least a portion of the outer surface of the outer layer (70), wherein at least a portion of the information, recorded and / or stored in the step of recording and / or storing information about the outer shape of at least a portion of at least one adjacent tooth, and / or opposing tooth is used, - means (42) for registering and / or storing a value of the outer bearing parameter (h4) and - means (44) for generating at least a part of the outer surface of the restoration (50), wherein the value of the outer layer thickness parameter (h4), and the surface re the surface of the outer layer is used. Device according to any one of claims 9-14, wherein the restoration parameters (h1, h2, h3, h4, h5, gl, g2) comprise a restoration thickness parameter (h5), intended to assume a value indicating the desired thickness of at least a part of the restaurant (50). Device according to any one of claims 9 to 15, wherein the restoration (50) is a reduced crown.