METHOD FOR CONSTRUCTING AT LEAST ONE DENTAL PROSTHETIC PART OR A BRACKET HAVING AT LEAST ONE ADHESIVE SURFACE

Abstract

The invention relates to a method for contructing at least one dental prosthetic part (20) or a bracket, with at least one adhesive surface (2), in which a 3D model (1) is made of the dental prosthetic part (20). Recesses (3,9,12,15,29,31) are constructed on the adhesive surface (2) of the 3D model (1).

Claims

1. Method for constructing at least one dental prosthetic part or a bracket having at least one adhesive surface comprising the steps of: creating a 3D model of the dental prosthetic part, wherein recesses are constructed on the adhesive surface of the 3D model.

2. Method according to claim 1, wherein surface area of the adhesive surface of the 3D model is enlarged by the recesses.

3. Method according to claim 1, further comprising the step of selecting specific surface regions of the adhesive surface of the 3D model, wherein the specific surface regions are provided with the recesses.

4. Method according to claim 3, wherein the selection of the surface regions is carried out manually by a user or automatically by means of a computer unit.

5. Method according to claim 4, wherein, for the automatic selection of the surface regions, an insertion axis of the 3D model is identified, wherein a surface normal of the adhesive surface of the 3D model is identified, wherein surface regions of the adhesive surface are selected that form an angle between the insertion axis and the surface normal of said surface regions that has at most a set value.

6. Method according to claim 5, wherein the set value of the angle between the insertion axis and the surface normal of the surface regions is at most 60.

7. Method according to claim 4, wherein, for the automatic selection of the surface regions, a surface normal of the adhesive surface of the 3D model is identified, wherein a force direction of a force acting on the planned dental prosthetic part is identified, wherein surface regions of the adhesive surface are selected that form an angle between the force direction and the surface normal of said surface regions that has at most a set value.

8. Method according to claim 7, wherein the set value of the angle between the force direction and the surface normal of the surface regions is at most 60.

9. Method according to claim 4, wherein, for the automatic selection, only surface regions of the adhesive surface are selected, in which the 3D model of the dental prosthetic part has a thickness that is greater than a predetermined minimum wall thickness.

10. Method according to claim 9, wherein the predetermined minimum wall thickness is 500 m.

11. Method according to claim 4, wherein the distribution of the recesses within the selected surface regions is uniform or dependent on a force acting on the planned dental prosthetic part.

12. Method according to claim 1, wherein for the construction of the recesses, a shape, a depth or a size of an individual recess is determined manually by a user or automatically by means of a computer unit.

13. Method according to claim 1, wherein for the construction of the recesses, a pattern of the recesses, a profile of the recesses and a symmetry of the recesses is determined manually by a user or automatically by means of a computer unit.

14. Method according to claim 1, wherein the dental prosthetic part to be constructed is a bridge having a number of bridge elements, wherein the distributions of the recesses on each of the number of bridge elements are coordinated by taking into account a force acting on the bridge with at least one specified force direction.

15. Method according to claim 1, wherein with respect to a shape, size, depth and/or distribution of each of the recesses, the recesses are set manually by a user or automatically by means of a computer unit depending on an adhesive used, a material used for the dental prosthetic part to be produced and/or depending on whether an additive or a subtractive manufacturing method is used.

16. Method according to claim 1, wherein the dental prosthetic part includes at least two adhesive parts, wherein the recesses are constructed on a first adhesive surface of a first adhesive part and on a second adhesive surface of a second adhesive part.

17. Method for producing a dental prosthetic part using a 3D model wherein the 3D model was constructed according to claim 1.

18. Method according to claim 17, wherein the dental prosthetic part is produced from a blank using a CAD/CAM method, wherein the dental prosthetic part having the constructed recesses is produced in one process step using the constructed 3D model.

19. Method according to claim 17, wherein the dental prosthetic part is produced from a blank using a CAD/CAM method, wherein the dental prosthetic part is produced without recesses in a first process step using the constructed 3D model, wherein the constructed recesses are carved out later in a second process step using the CAD/CAM method.

20. Method according to claim 18, wherein the dental prosthetic part is produced using the CAD/CAM method by means of a CAD/CAM device comprising a CAD unit, a CAM unit and a control device for machine movements of a manufacturing machine, wherein the recesses are constructed with the aid of software of the CAD unit, with the aid of software of the CAM unit and/or with the aid of the control device for machine movements.

21. Method according to claim 17, wherein the recesses have the shape of a hemisphere, a cube, a cuboid or a pyramid.

22. Method according to claim 17, wherein a special tool having the shape of the recess or recesses to be produced is used to carve out the recesses, so that a recess or a number of recesses are carved out in one process step in a single use of the special tool.

23. Method according to claim 17, wherein the dental prosthetic part is produced using an additive manufacturing method.

24. Method according to claim 23, wherein the form of the recess comprises a cylindrical channel having a first set diameter and a cavity having a second set diameter that exceeds the first diameter of the channel.

25. Method according to claim 23, wherein the shape of the recess is a cylindrical channel, the axis of which exceeds an angle of 45 relative to an insertion axis of the dental prosthetic part.

26. Method according to claim 23, wherein a number of recesses have the form of channels which are connected to one another at their ends within the dental prosthetic part by a further channel.

27. Method according to claim 1, wherein the material of the dental prosthetic part is a plastic, a ceramic, a metal or a mixture of a plastic and a ceramic.

28. Dental prosthetic part having at least one adhesive surface, wherein recesses are arranged on the adhesive surface of the dental prosthetic part.

29. Dental prosthetic part according to claim 28, wherein the adhesive surface of the dental prosthetic part is formed such that, when the dental prosthetic part is adhesively bonded to a preparation, only contact surfaces of the adhesive surface in the outer region of the adhesive surface come into contact with the preparation, wherein the adhesive surface in the inner region of the adhesive surface has no direct contact with the preparation, so that a continuous adhesive film consisting of an adhesive is formed between the adhesive surface of the dental prosthetic part and the preparation.

30. Dental prosthetic part according to claim 28, wherein the dental prosthetic part is constructed using a method according to claim 1.

31. Dental prosthetic part according to claim 28, wherein the dental prosthetic part is produced using a method according to claim 17.

32. Dental prosthetic part according to claim 28, wherein the dental prosthetic part includes at least two adhesive parts, wherein the recesses are arranged on a first adhesive surface of a first adhesive part and on a second adhesive surface of a second adhesive part in order to adhesively bond the two parts to one another.

33. Dental prosthetic part according to claim 32, wherein the dental prosthetic part includes at least two adhesive parts is a veneer-framework, a multi-unit dental prosthetic part, a dental prosthetic part comprising a mesostructure with a crown to be set upon it or a dental prosthetic part comprising a Ti base with at least one crown to be set upon it.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The invention is explained with reference to the drawings. The drawings show:

[0083] FIG. 1 a sketch to illustrate the method,

[0084] FIG. 2 a dental prosthetic part that was produced by means of a CAM/CAD method in accordance with a constructed 3D model.

DESIGN EXAMPLES

[0085] FIG. 1 shows a sketch for illustrating the method for constructing at least one dental prosthetic part having at least one adhesive surface, in which a 3D model 1 is made of the dental prosthetic part. Recesses 3 are constructed on an adhesive surface 2. The 3D model 1 is constructed by means of a CAD device, such as a computer 4. Input means, such as a mouse 5 and a keyboard 6, which allow the user to process the 3D model 1 by means of a cursor 7, are connected to the computer 4. The 3D model 1 is graphically displayed by means of a display device 8, such as a monitor, that is connected to the computer 4. A first recess type 9 comprises a cylindrical channel 10 and a wider cavity 11 in the interior of the 3D model 1. A second recess type 12 comprises at least two cylindrical inlet channels 13 and a transverse channel 14, which connects the ends of the inlet channels in the interior of the 3D model 1. A third recess type 15 comprises cylindrical inlet channels 16, the axes 17 of which form an angle with an insertion axis 18 of the 3D model 1 that exceeds 45. The angle 19 thus ensures a positive-locking fit and consequently a higher stability of the adhesive connection.

[0086] FIG. 2 shows a dental prosthetic part 20 that was produced by means of a CAM/CAD method in accordance with a constructed 3D model 1. In the present case, the dental prosthetic part 20 is a bridge consisting of a first bridge element 21, a second bridge element 22 and an intermediate element 23. The bridge is adhesively bonded to a first tooth stump 24 and a second tooth stump 25. The first tooth stump 24 possesses a first insertion direction 26. The second tooth stump 25 possesses a second insertion direction 27. First recesses 29 are provided on a first adhesive surface 28 of the first bridge element 21. Second recesses 31 are provided on a second adhesive surface 30 of the second bridge element 22. The recesses 29 and 31 are in the form of spherical recesses. The first adhesive surface 28 of the dental prosthetic part 20 is shaped such that only first contact surfaces in the outer region of the adhesive surface 28 come into contact with the first tooth stump 24 when said dental prosthetic part 20 is adhesively bonded to the tooth stump 24 of a preparation. The adhesive surface in the inner region has no direct contact with the tooth stump 24, so that a continuous adhesive film 33, consisting of the adhesive, is formed between the adhesive surface 28 and an adhesive surface 34 of the first tooth stump 24. Recesses 35 were also created on the adhesive surface 34 of the tooth stump 24 in order to improve the stability of the adhesive connection. The second adhesive surface 30 of the second bridge element 22 also comprises surfaces 36 in the outer region of the adhesive surface 30 and a continuous adhesive film 37. Recesses 39 were also created on an occlusal surface 38 of the second tooth stump 25 in order to improve the stability of the adhesive connection.