received by the International Bureau on 1 1 December 2014 (1 1 .12.2014)

1. Method for taking an impression of at least partial regions of the upper and lower jaw for producing a dental prosthesis, in particular a denture, comprising the procedural steps of:

A) generating an impression of at least partial regions of the upper jaw and lower jaw of a patient using an at least two-part tray in the oral cavity of the patient, whereby the tray Is being Inserted into the oral cavity of the patient for this purpose;

B) fixing the at least two tray parts (1 , 2, 14, 31 , 32) to each other or against each other in the oral cavity of the patient;

C) followed by determining the position and orientation of the at least two tray parts (1, 2, 14, 31, 32) with respect to each other in the oral cavity of the patient; wherein the position and orientation of the tray parts (1 , 2, 14, 31 , 32) with respect to each other are determined by means of at least one marking (8, 18, 38, 48) on each of the tray parts (1, 2, 14, 31, 32) and

D) followed by taking the tray parts (1, 2, 14, 31, 32) out the oral cavity of the patient.

2. Method according to claim 1 , characterised in that

the position and orientation of the tray parts (1 , 2, 14, 31, 32) with respect to each other are determined by means of an imaging method.

3. Method according to claim 1 or 2, characterised in that

the position and orientation of the markings (8, 18, 38, 48) are determined with respect to each other and the data thus obtained are used to determine the position and orientation of the tray parts (1 , 2, 14, 31 , 32) with respect to each other.

4. Method according to any one of the preceding claims, characterised in that,

for determination of the position and orientation of the tray parts (1, 2, 14, 31, 32) with respect to each other, regions of the tray parts (1, 2, 14. 31 , 32), preferably comprising the markings (8, 18, 38, 48), are recorded, digitised, and analysed In computer-based manner by means of a stereo image or at least two images taken from different perspectives.

5. Method according to any one of the preceding claims, characterised in that, for determination of the position and orientation of the tray parts (1, 2, 14, 31, 32) with respect to each other, the surfaces of the tray parts (1 , 2, 14, 31 , 32), at least regions thereof, are imaged intra-orally or scanned with an optical method, whereby it is preferable to image or scan at least two markings (8, 18, 38, 48) of at least two different tray parts (1 , 2, 14, 31, 32) concurrently. 6. Method according to any one of the preceding claims, characterised in that

the fixation of at least two tray parts (1 , 2, 31 , 32) with respect to each other or on each other is detached before removal from the oral cavity of the patient and after the determination of the position and orientation of the at least two tray parts (1 , 2, 31 , 32) with respect to each other, and in that the tray parts (1 , 2, 31 , 32) are taken out of the oral cavity separately. 7. Method according to any one of the preceding claims, characterised in that

a lip shield (14) Is used as at least a third tray part (14) and is preferably attached to the tray part (2, 32) for the upper jaw, whereby the lip shield (14) preferably has at least one marking arranged on it that is used to determine the position and orientation of the lip shield (14) with respect to the tray part (2, 32) for the upper jaw and/or that the lip shield (14) has a surface provided on it on which can be written and which serves to have aesthetic features drawn on it and whioh has at least one aesthetic feature drawn on it. 8. Method according to any one of the preceding claims, characterised in that

the position and orientation of the at least two tray parts (1 , 2, 14, 31 , 32) with respect to each other is stored and used in a computer to calculate a virtual model of the dental prosthesis to be produced, preferably is stored and used to calculate the orientation and size of the dental prostheses of a denture for the upper jaw and/or a denture for the lower jaw of the patient. 9. Method according to claim 8. characterised in that

the dental prosthesis is produced by means of a CAD/CAM method, whereby the position and orientation of the at least two tray parts (1, 2, 14, 31 , 32) with respect to each other are utilised in the generation of a virtual CAD model.

10. Method according to any one of the preceding claims, characterised in that an Impression of the upper jaw and/or lower jaw of the patient taken with the tray is used to generate a data set by reading the three-dimensional surface structure of the impression of the upper jaw and/or lower Jaw of the patient, and In that the data set is preferably used to generate the virtual CAD model of the dental prosthesis, in particular of the denture, which is used to produce the real dental prosthesis, in particular the real denture.

11. Method according to any one of the preceding claims, characterised in that

a rigid connecting element with multiple markings (8, 18, 38, 48), In particular an irregular raster or an irregular grid, is attached to the at least two tray parts (1, 2, 14, 31, 32) and in that the connecting element is used to determine the position and orientation of the at least two tray parts (1 , 2, 14, 31 , 32) with respect to each other.

12. Tray for taking an impression of at least partial regions of the upper and lower jaw of a patient for implementing a method according to any one of the preceding claims, comprising at least two tray parts (1 , 2, 14, 31 , 32), whereby at least one marking (8, 18, 38, 48) is arranged on the surface of each tray part and enables the determination of the position and orientation of the markings (8, 18, 38, 48) and tray parts (1, 2, 14, 31 , 32) with respect to each other.

13. Tray according to claim 12, characterised in that

the markings (8, 18, 38, 48) are contoured elements arranged on the surface of the tray parts (1 , 2, 14, 31. 32). whereby the geometry of the contoured elements allows the position and orientation of the contoured elements with respect to each other to be determined.

14. Tray according to claim 12 or 13, characterised in that

the markings (8, 18, 38, 48) are arranged on the edge of the tray parts (1 , 2, 14, 31, 32) such that the markings (8, 18, 38, 48) of adjacent tray parts (1, 2, 14, 31 , 32) that are inserted into the oral cavity of the patient are situated as close to each other as possible, and preferably the markings can be imaged on just one image of a recording device in the oral cavity of the patient.

15. Tray according to any one of the claims 12 to 14, characterised in that at least one tray part (2, 32) for the upper jaw and at least one tray part (1 , 31) for the lower jaw are provided, whereby the tray parts (1, 2, 31, 32) can be placed at a distance from each other by means of a screw (20) or a pin (20, 50), preferably can be attached at an adjustable distance from each other. 16. Tray according to claim 15, characterised in that

the pin (20, 50), which comprises a mobile pestle (20, 50) that is supported against the tray part (1 , 2, 31 , 32) as In a bearing in spring-loaded manner, or the screw (20) are arranged on one of the tray parts (1, 2, 31 , 32), whereby the other tray part (1 , 2, 31 , 32) comprises a recess (22, 52) for accommodation of the tip of the screw (20) or tip of the pestle (20, 50), whereby the recess (22, 52) preferably comprises a matching counter- thread for the screw (20) or the recess (22, 52) is a negative fit for the tip of the pestle (20, 50), whereby the tip of the pestle (20, 50) preferably is arranged appropriately mobile in the recess (22, 52) such that it can be inclined towards all sides. 17. Tray according to any one of the claims 12 to 16, characterised in that

the tray parts (1 , 2, 14, 31, 32) comprise a matte, and preferably also a light-coloured, surface at least in the region of the marking (8, 18, 38, 48), preferably a rough surface which, in particular, comprises a mean roughness between 0.5 \im and 10 \im. 18. Device for intra-oral determination of the orientation and position of at least two tray parts (1, 2, 14, 31, 32) according to one of claims 12 to 17 for taking an impression of at least partial regions of the upper and lower jaw of a patient with respect to each other, whereby the device is suitable for implementing a method according to any one of the claims 1 to 11 and the device comprises a computer and a recording facility, in particular an Intra-oral scanner or an intraoral camera, that can be used to determine the position and orientation of the tray parts (1 , 2, 14, 31 , 32) with respect to each other by means of an imaging method and a computer-based analysis of the images for a known shape of the tray parts (1, 2, 14, 31, 32), whereby a tray according to any one of the claims 12 to 17 preferably is a separate part of the device and the position and orientation of the tray parts (1, 2, 14, 31, 32) with respect to each other can be determined by means of a computer-based analysis of the images of the known markings (8, 18, 38, 48) on the tray parts (1, 2, 14, 31, 32). 19. Device according to claim 18, characterised In that

the device comprises a 3D printer for producing a dental prosthesis, in particular a denture, and is connected to the computer for producing the dental prosthesis, in particular the denture, whereby the computer is programmed appropriately such that the position and orientation of the tray parts (1, 2, 14, 31, 32) with respect to each other has a significant Influence on the build-up of the dental prosthesis, in particular of the denture, preferably on the configuration of teeth in the dental prosthesis.