Method for generating a CAM dataset

Abstract

The present invention relates to a method for generating a CAM dataset, having the steps of providing (S201) a digital CAD dataset for a dental prosthesis having first reference data for a first spatial reference geometry; providing (S202) a digital CAM dataset having second reference data for a second spatial reference geometry; and integrating (S203) the CAD dataset in the CAM dataset by aligning the first spatial reference geometry of the CAD dataset with the second spatial reference geometry of the CAM dataset.

Description

METHOD FOR GENERATING A CAM DATASET The present invention relates to a method for generating a CAM dataset and to a computer program for carrying out the method. During the production of dental prostheses using a CAD method, inaccuracies arise which are caused because the CAD dataset of the dental prosthesis is imprecisely incorporated into a CAM dataset. Therefore, it is the technical object of the present invention to improve the CAD production of a dental prosthesis. This object is achieved by the technical subject matter disclosed herein. Further technically advantageous embodiments are the subject matter of the description and the drawings. According to a first aspect, the technical object is achieved by a method for generating a CAM dataset, having the steps of providing a digital CAD dataset for a dental prosthesis having first reference data for a first spatial reference geometry; providing a digital CAM dataset having second reference data for a second spatial reference geometry; and integrating the CAD dataset into the CAM dataset by aligning the first spatial reference geometry of the CAD dataset with the second spatial reference geometry of the CAM dataset. The reference geometry can be indicated by a reference geometry such as e.g. a reference cross. The method achieves the technical advantage that the CAD dataset can be integrated optimally into the CAM dataset and subsequent production of the dental prosthesis in a milling method is improved. In a technically advantageous embodiment of the method, the CAM dataset comprises data for a blank for producing the dental prosthesis. In this way, for example, the technical advantage is achieved that the design of the dental prosthesis can be adapted to the blank in the best manner possible. In a further technically advantageous embodiment of the method, the data for the blank render a circular disc. In this way, for example, the technical advantage is achieved that the material outlay for producing the dental prosthesis can be reduced. In a further technically advantageous embodiment of the method, the data for the blank render an inhomogeneous structure of the blank for generating a gum impression. In this way, for example, the technical advantage is achieved that a dental prosthesis can be generated with a realistic gum edge in a simple manner. In a further technically advantageous embodiment of the method, the inhomogeneous structure is formed by a waveform. In this way, for example, the technical advantage is achieved that the waveform generates a realistic gum edge. In a further technically advantageous embodiment of the method, the first and / or second spatial reference geometry indicates a spatial axis and / or a reference cross. In this way, for example, the technical advantage is achieved that the two datasets can be effectively aligned with one another. In a further technically advantageous embodiment of the method, the spatial axis is oriented perpendicularly to a surface of a blank. In this way, for example, the technical advantage is achieved that the dental prosthesis can be visualised more effectively. In a further technically advantageous embodiment of the method, the CAM dataset can be selected from a plurality of previously stored CAM datasets. In this way, for example, the technical advantage is achieved that different CAM datasets can be used which are adapted to the design of the dental prosthesis. In a further technically advantageous embodiment of the method, the dental prosthesis is generated automatically on the basis of the CAM dataset. In this way, for example, the technical advantage is achieved that the dental prosthesis can be produced rapidly. In a further technically advantageous embodiment of the method, the CAM dataset is converted into milling data for milling the dental prosthesis. In this way, for example, the technical advantage is achieved that the dental prosthesis can be produced simply. In a further technically advantageous embodiment of the method, the dental prosthesis is milled on the basis of the milling data by a milling device. In this way, for example, the technical advantage is likewise achieved that the dental prosthesis can be produced simply. According to a second aspect, the technical object is achieved by a computer program, comprising instructions which, when the computer program is executed by a computer, cause said computer to carry out the method disclosed herein. The computer program achieves the same technical advantages as the method according to the first aspect. Exemplified embodiments of the invention are illustrated in the drawings and are described in more detail hereinunder. In the drawings: Figure 1 shows a block diagram of a method for producing a dental prosthesis; Figure 2 shows a schematic illustration of a CAD dataset and a CAM dataset; and Figure 3 shows a block diagram of a method for generating a CAM dataset. Figure 1 shows a block diagram of a method for producing a dental prosthesis. In step S101, a reference geometry for a blank is imported, as a CAM dataset, into the dental CAD dataset indicating the spatial shape of the dental prosthesis. This represents e.g. the periphery and height of the disc of the blank. A waveform for generating a gum edge can likewise be visualised. The CAM dataset for the blank can indicate, in addition to the shape, the properties of the blank such as e.g. an inhomogeneous structure of the blank for generating a visual gum impression. This can be formed by a multicoloured blank having an inhomogeneous colour distribution (pink / white) in the waveform. However, the blank can also contain an inhomogeneous material distribution having a plurality of materials which is likewise rendered by the CAM dataset for the blank. In step S102, a reference geometry is indicated, such as e.g. a reference cross which is used to align the prosthesis in the disc, i.e. the CAM dataset. The reference geometry can lie outside the spatial region of the dental prosthesis. The reference geometry can be predetermined in a separate dataset which is likewise imported into the CAD dataset. In general, other geometric shapes or structures can also be used as reference geometry. In step S103, the reference geometry is then aligned with the design of the prosthesis in the best manner possible. In step S104 a check is made whether the profile of the tooth or that of the gingival of the specification matches the provided geometry. If this is not the case, in step S105 the design is adapted with the tools of the CAD software such that the transition of the tooth or gingiva extends along the provided geometry. If the check in step S104 is successful, then in step S106 the reference cross is aligned along the cross with the imported geometry and added to the prosthesis base. In step S107, a file of the dental prosthesis is created in STL format. The dataset is hereby transformed. However, in general it is also possible to use other data formats which are suitable for a subsequent milling process. Metadata can also be integrated into the dataset for this purpose. In step S108, the CAD dataset for the dental prosthesis is imported into the CAM dataset for the blank. In step S109, the dental prosthesis is aligned in the Z axis using the reference cross and in step S110 the dental prosthesis is aligned in the X and Y axes using the reference cross. Aligning is achieved by rotating and displacing the CAD dataset of the dental prosthesis. Then, the tooth specification of the dental prosthesis follows the inhomogeneous colour distribution in the waveform of the blank. As a result, an optimum aesthetic result can be achieved when milling. Aligning can be effected such that the spatial reference geometry of the CAD dataset is displaced and / or rotated with respect to the second spatial reference geometry of the CAM dataset. In step S111, the data are approved for milling and the dental prosthesis is generated in a fully automated manner from the blank by a controlled milling device. Figure 2 shows a schematic illustration of a CAD dataset and a CAM dataset. The CAD dataset is the result of spatial planning and design of the dental prosthesis 103 by means of CAD software. During this planning and design, the shape and colour of the dental prosthesis 103 is fixed. The CAM dataset reflects the shape and the properties of the blank 101 and is used to actuate cutting machines or 3D printers. For this purpose, the CAM dataset is transmitted e.g. to a milling device 107 which cuts the dental prosthesis 103 out of the blank 101 by means of a milling tool. The CAD dataset CAD comprises data regarding a reference geometry 105-1 such as e.g. a reference cross or individual reference points. In a similar manner, the CAM dataset CAM also comprises predetermined data regarding a reference geometry 105-2 such as e.g. a reference cross or individual reference points. The two reference geometries 105-1 and 105-2 are used to align the CAD dataset CAD within the CAM dataset so that the design of the dental restoration can be aligned in the best manner possible. This occurs e.g. by rotating or displacing the CAD dataset about or along the reference geometries 105-1 and 105-2. In addition, the dental prosthesis 103 can be transmitted from the CAD software into the CAM software in the correct position. As a result, the transfer of a design, such as e.g. a so-called Shell Disc prosthesis, from the CAD software into the CAM software in the correct position will be ensured. Using the reference geometry 105-1 which is integrated into the used Shell Disc geometry, the dental prosthesis 103 is integrated in the CAD software as the last step. The reference geometry 105-1 is a part of the dataset of the designed dental prosthesis 103. A dataset for a Shell Disc having the same reference geometry 105-2 is stored in the CAM software. The designed dental prosthesis 103 having the reference geometry 105-1 can be imported and can be aligned, in the nesting using the reference geometry 105-1, with the particular reference geometry 105-2 of the Shell Disc. As a result, the spatial coordinates (X, Y, Z) of the dental prosthesis 103 are determined in the Shell Disc. Figure 3 shows a block diagram of a method for generating a CAM dataset. In a first step S201, a digital CAD dataset for a dental prosthesis is provided and comprises first reference data for a first spatial reference geometry. The reference data are e.g. data which indicate a particular spatial position within the CAD dataset. The spatial position can be predetermined by a reference geometry such as e.g. a reference cross. In step S202, a digital CAM dataset having second reference data for a second spatial reference geometry is provided. In step 203, the CAD dataset is integrated into the CAM dataset by aligning the first spatial reference geometry of the CAD dataset with the second spatial reference geometry of the CAM dataset. The method for generating a CAM dataset can be used to automatically and rapidly transfer the dental prosthesis 103 from the CAD software into the CAM software in the correct position. All features explained and illustrated in conjunction with individual embodiments of the invention can be provided in a different combination in the subject matter in accordance with the invention in order to achieve the advantageous effects thereof at the same time. All the method steps can be implemented by devices which are suitable for carrying out the respective method step. All functions which are carried out by features relating to the device can be a method step of a method. The scope of protection of the present invention is set by the claims and is not limited by the features explained in the description or shown in the figures.

Claims

1. A process for generating a CAM dataset (CAM), comprising: _ providing a digital CAD dataset (CAD) for a dental prosthesis having first reference data for a first spatial reference geometry; _ providing a digital CAM dataset (CAM) having second reference data for a second spatial reference geometry; _ integrating the CAD dataset (CAD) into the CAM dataset (CAM) by aligning the first spatial reference geometry of the CAD dataset (CAD) with the second spatial reference geometry of the CAM dataset (CAM); _ wherein the first and / or second spatial reference geometry indicates a spatial axis and / or a reference cross; and milling the dental prosthesis.

2. The process as claimed in claim 1, wherein the CAM dataset (CAM) comprises data for a blank for producing the dental prosthesis.

3. The process as claimed in claim 2, wherein the data for the blank render a circular disc.

4. The process as claimed in claim 2, wherein the data for the blank render an inhomogeneous structure of the blank for generating a gum impression.

5. The process as claimed in claim 4, wherein the inhomogeneous structure is formed by a waveform.

6. The process as claimed in claim 1, wherein the spatial axis is oriented perpendicularly to a surface of a blank.

7. The process as claimed in claim 1, wherein the CAM dataset (CAM) can be selected from a plurality of previously stored CAM datasets.

8. The process as claimed in in claim 1, wherein the dental prosthesis is generated automatically on the basis of the CAM-dataset (CAM).

9. The process as claimed in in claim 1, wherein the CAM dataset (CAM) is converted into milling data for milling the dental prosthesis.

10. The process as claimed in claim 9, wherein the dental prosthesis is milled on the basis of the milling data by a milling device.

11. A computer program product comprising program code which is stored on a non- transitory machine-readable medium, the machine-readable medium comprising computer instructions executable by a processor, which computer instructions cause the processor to perform the process according to claim 1.