Milling blanks and methods for producing dental forms

Abstract

The invention relates to a milling body (1) for producing dental mouldings, the milling body (1) having a solid body (2) made of a biocompatible first material, on whose upper surface a cavity (4) for accommodating a flowable polymerizable plastic is arranged, the cavity (4) having a bottom (6) and, starting from the edge of the bottom (6), the cavity (4) is laterally bounded by an annular wall (8), the annular wall (8) being ring-shaped, the first material forming the bottom (6), the solid body (2) extending to a lower surface of the milling body (1) arranged opposite the upper surface of the milling body (1). The invention also relates to a method for producing dental prostheses using such a milling body (1), as well as to sets and dental mouldings produced by such a method.

Description

[Technical field]

[0001] The present invention relates to a milling blank for producing dental moulds such as partial or total dental prostheses or night guards, as well as a method for producing dental moulds using such a milling blank. The milling blank is intended and suitable for subtractive processing, and the dental moulds produced from the milling blank must be insertable into a patient's oral cavity for dental applications.

[0002] Besides manual techniques, digital manufacturing methods are also becoming increasingly important in the field of dentistry. Dentures and other dental forms, such as dental prostheses, crowns, bridges and night guards, have been produced subtractively and by milling for several years using CAD / CAM techniques (CAM: Computer-Aided Manufacturing, German: rechnerunterstuetzte Fertigung, CAD: Computer-Aided Design, German: rechnerunterstuetzte Konstruktion). CAD / CAM methods are also increasingly being used in the manufacture and design of partial and complete dental prostheses with prosthesis bases that support dentures fixed or placed above and within the gums.

[0003] Within the framework of prosthetic work, in particular the digital design of partial or total prostheses, the structure is divided into a "white" or tooth-colored tooth part (denture) and a gum-colored ("pink") prosthetic base part (prosthesis base). Thus, a dental prosthesis consists of a gum-colored or pink base and a tooth-colored part (denture or tooth segment).

[0004] Methods exist for digitally creating partial or complete dental prostheses and manufacturing them by CAD / CAM methods, such as those known from DE 102009056752 A1 or WO 2013 / 124452 A1. In a method for manufacturing dentures known from DE 10304757 A1, the teeth are virtually created in a virtual model and the prosthesis base is manufactured on the basis of this virtual model. In the method disclosed in EP 2742906 A1, the dental arch is bonded to an impression material, which is contained in an individualized impression tray and contains an impression of the patient's oral situation. The surface of the mold containing the dental arch is digitized and then by calculation the virtual model of the dental arch is positioned and oriented in the virtual model of the prosthesis base so as to fit as closely as possible.

[0005] Within the framework of digital total or partial prosthetics, dentures or tooth mouldings are required which can be bonded unambiguously and reproducibly to a prosthetic base.

[0006] In the method for producing a dental prosthesis disclosed in WO 2016 / 091762, a model is formed, which can be used to fix a number of dentures to a prosthesis base in a desired position and orientation relative to one another. The dentures are shortened by base grinding in the cervical region, which results in a desired occlusal vertical dimension. In the method for producing a dental prosthesis disclosed in WO 2016 / 110392, a plastically deformable fastening means is inserted into the alveolus of the prosthesis base, which allows manual correction of the positioning of the dentures on the prosthesis base. From DE 102008019694 A1, a method and a device are known for producing dental mouldings from ceramics using a laser. In the method of producing dental prostheses known from EP 2 571 451 and EP 2 666 438, a ready-made denture is embedded in wax in a holder and then the neck is milled out by CAM methods. In order to adapt the height of the teeth to the patient's jaw, i.e. to adjust the vertical occlusal dimension of the dental prosthesis to the patient's requirements, it is necessary to shorten the denture in the base (or neck). WO 2014 / 159436 discloses a laminated dental prosthesis with a reinforcement material at the base of the prosthesis, which is poured into the cavity of the base. Besides dental prostheses, further dental mouldings such as night guards can also be produced digitally on the basis of patient data by subtractive CAM methods. A disadvantage of such night guards is that they must be sufficiently wear-resistant, which, however, reduces the wearing comfort on the tooth side. Furthermore, the possibilities for esthetic modification of the night guard are limited.

[0007] The bonding of the base and the tooth-colored part (denture) is a major challenge, both in additive and subtractive manufacturing. Bonding is usually achieved by gluing, where the use of too little or too much adhesive impairs the quality of the transition and the correct positioning of the denture during gluing. Similarly, the available one-piece two-color (gingiva-colored and tooth-colored) milling blanks do indeed have a very good layer bond, but due to the predefined phase boundaries the esthetics are always a compromise and therefore unsatisfactory.

[0008] US 2013 / 0101962 A1 discloses a method for producing a dental prosthesis, in which recesses are milled into a block along the dental arch, the recesses being filled with plastics, while a denture is produced from the plastics hardened in the recesses. The block is then substantially removed, and a prosthesis base is produced from the block. This method is a multi-stage milling method. The disadvantages of the method according to US 2013 / 0101962 A1 are the high material losses, the time required for material removal of the block, as well as the wear of the tools required for this. In the reverse method for producing a dental prosthesis, known from EP 2915503 A1, a milling blank is subtractively machined from the tooth fused material, thereby forming a cavity that is used as a negative mold for the prosthesis base of the dental prosthesis. The occlusal and basal sides of the dental prosthesis are then produced subtractively from the composite thus produced. This is also a multi-step milling method. The disadvantage of the method according to EP 2915503 is that in order to produce the dental prosthesis, a very large amount of relatively hard tooth-fusible material must be removed. This not only entails a large loss of tooth-fusible material, but also intensive loading of the milling tool and a relatively long time required to carry out the method. Furthermore, if the tooth-fusible material is not completely removed from the outer surfaces (occlusal and oral sides) of the prosthesis base, esthetically disturbing white or tooth-colored residues may remain, which must then be removed manually by the dental technician. This may again result in an undesirable thinning of the material thickness of the prosthesis base.

[0009] To manufacture a digitally designed total prosthesis, the following possibilities exist in the prior art:

[0010] 1. Mill or print a gum-colored base and glue it onto the artificial tooth, alternatively onto a milled or printed tooth-colored segment. Possible disadvantages in this case are: inaccurate production, time wasted, aesthetic problems due to excess glue or underfilling of edge gaps, limitations regarding milling processability of cavities due to undercuts.

[0011] 2. Milling prefabricated milling discs incorporating a two-phase structure. In this case, an attempt is made to achieve natural esthetics by precise positioning of the transition. The drawback here is the location of the transition from the gum color to the tooth color, which is always a compromise and not aesthetically pleasing.

[0012] 3. Milling of preformed bodies, into which the ready-made teeth are already incorporated. With these methods, mainly only the base side of the prosthesis is produced individually. The disadvantage here is that the adaptability to the individual patient's case is extremely limited, and a large number of variations of preformed bodies must be provided.

[0013] 4. Layered prosthesis consisting of multiple tooth-colored individual layers and prosthesis bases, with multiple milling operations and refilling of the cut-out cavities. The disadvantages of this method are high material loss and time.

[0014] The object of the present invention is to overcome the disadvantages of the prior art. In particular, it is intended to find the possibility of providing a method and a milling body for producing dental mouldings made of two different materials firmly bonded to each other, which allows for a fast and resource-efficient production of dental mouldings using subtractive CAM methods. The bonding of the materials is preferably carried out without adhesives as adhesion promoters. In particular, it is preferable that the two materials can be directly bonded to each other within the scope of the method. For this, it is preferable that the milling body already has suitable characteristics, so that the method can be carried out as simply and effortlessly as possible. It is preferable that the method can be carried out as simply and effortlessly as possible for the dental technician, and that the milling body has suitable characteristics for carrying out the method. In particular, it is preferable that fully automated or as fully automated as possible, such as CAD / CAM technology, is used and usable.

[0015] The problem according to the invention is solved by a milling body according to claim 1, a set according to claim 11, a method according to claim 12 and a dental mould according to claim 25. Preferred variants are claimed in the dependent claims 2-10 and 13-24.

[0016] The problem of the present invention is thus solved by a milling body for producing dental mouldings, which has a solid body made of a first material, which is biocompatible, a cavity for accommodating a flowable polymerisable plastic is arranged on the upper surface of the milling body, the cavity has a bottom and, starting from the edge of the bottom, the cavity is laterally bounded by an annular wall, which is ring-shaped, the first material forms the bottom, and the solid body extends to a lower surface of the milling body, which is arranged opposite the upper surface of the milling body.

[0017] Theoretically, it may be envisaged that the underside of the milling body is partially or completely coated with the second material, the second material then forming superficially the outer underside of the milling body. In particular, the wall may extend up to the underside of the milling body and protrude slightly from it. However, it is preferred according to the invention that the surface of the underside of the milling body is at least partially, or particularly preferably completely, formed by the first material and is not covered by any other material, since this makes the application of the milling body easier and the construction less expensive.

[0018] Theoretically, it is possible to realize the annular wall by means of a separate annular piece or a separate tube piece which is first fitted onto the solid body immediately before or during the application of the manufacturing method and is then firmly connected to the solid body or is firmly connected to the solid body in another way, whereby such an arrangement is considered according to the invention or at least equivalent.

[0019] It may be envisaged that the first material is a plastic or a plastic composition, preferably polymethylmethacrylate (PMMA) or a PMMA-containing plastic composition and / or a high temperature polymer.

[0020] The annular wall in the sense of the present invention has a recess, which surrounds the geometric center point of the recess. Preferably, the recess is formed without undercuts and / or any point in the recess can be connected by a straight line to any other point in the recess without this straight line extending inside the annular wall. Preferably, the recess is a compact geometric shape.

[0021] The cavity, before being processed by the method for producing a dental form, preferably has no surface that is directly defined by the outer surface of the dental form to be produced, in particular no contour of a tooth, a dental arch and / or a prosthesis base, only the dimensions of which may preferably be adjusted to the typical or maximum size of the dental form.

[0022] A milling body in the sense of the present invention means a solid body which is suitable for subtractive machining with a milling tool and whose geometric dimensions make it suitable for handling in a CAM milling machine.

[0023] It may be provided that in the milling body according to the invention, the annular wall has a wall thickness of at most 20 mm, preferably at most 10 mm, particularly preferably at most 5 mm, and that the height of the annular wall is at least 5 mm, preferably at least 15 mm.

[0024] The height of the annular wall refers to the distance of the upper edge of the annular wall from the plane of the bottom of the cavity.

[0025] Preferably, the annular wall has a uniform wall thickness and / or a uniform height.

[0026] As a result, the milling body, with respect to its dimensions, is well suited for use as a semi-finished product for producing dental mouldings.

[0027] It may be envisaged that the milling body has an outer dimension of 50 mm to 150 mm, in particular a diameter of 50 mm to 150 mm. Such dimensions are significant and sufficient for dental mouldings.

[0028] It may further be provided that on at least one inner surface of the annular wall which defines the cavity, markings are arranged for measuring the filling level in the cavity, in which case the markings preferably have a scale with equally spaced graduation lines and / or numerical values, particularly preferably a vertical scale for measuring the filling height or volume of the flowable polymerizable plastic in the cavity.

[0029] This allows the user to precisely fill the cavity with the correct desired amount of flowable polymerizable plastic, thereby avoiding waste of material and at the same time reducing the time required for the subsequent subtractive processing of the milling body, which potentially also protects the milling tool.

[0030] As markings, indentations may be arranged on the inner surface of the annular wall or may be formed during the method according to the invention, which may be used to measure the filling height to which the flowable polymerizable plastic can be filled. A rod or guide with a suitable length may be inserted into the indentations as an extension beyond the periphery. The guides may facilitate repositioning of the milling body in the CAM device.

[0031] It may further be assumed that the bottom of the cavity is flat and / or the annular wall has a cylindrical surface towards the interior of the cavity, in which case preferably the annular wall is tubular.

[0032] This provides a milling body which can be manufactured particularly simply and inexpensively.

[0033] It may also be envisaged that the annular wall of the milling body is formed by a tube piece or a ring body fixed to the solid body, in which case preferably the milling body consists of the first material and the tube piece or the ring body, or that the annular wall of the milling body consists of the first material, in which case preferably the solid body and the annular wall are formed integrally, whereby the milling body consists of the first material.

[0034] Both measures allow for a simple and cheap production of the milling body.

[0035] It may be advantageously provided that the piece or ring is connected to the solid body in a liquid-tight manner, and likewise that the piece or ring is glued to the solid body all over and / or in the circumferential direction.

[0036] Preferably, the first material is a first plastic material, in which case it may be envisaged that preferably the first plastic material is final cured.

[0037] The plastic material can be manufactured inexpensively. The use of a final cured first plastic material can prevent shape changes after milling of the first plastic material due to post-curing of the first plastic material.

[0038] It may further be assumed that the first material is a laminated first plastic material with a plurality of layers of different color tones, in which case the layer planes of the layers are preferably arranged parallel to the bottom of the cavity or parallel to a plane arranged perpendicular to the annular wall, in particular parallel to the base surface of the cylindrical inner wall of the annular wall.

[0039] By this means, an aesthetically attractive dental molding can be produced from the first material. This is particularly important when producing dentures from the first material. The first material is therefore preferably a tooth-colored laminate material with layers of different tooth-color shades, preferably with the darker layers arranged towards the cavity. Preferably, the first material is a multi-layer material with layers of different tooth-color shades.

[0040] It may further be envisaged that the milling body is a circular blank with a cylindrical periphery, in which the annular wall forms a partial region of the cylindrical periphery, in which preferably a holding part for fixing the circular blank to the CAM device is arranged on the outer surface of the cylindrical periphery, in which particularly preferably the holding part is a protruding ring surrounding the cylindrical periphery.

[0041] This allows the milling body to be fixed to the CAM device in any axial direction, and furthermore the milling body can also be repositioned in this way.

[0042] It may additionally be envisaged that the solid body has a step on its cylindrical outer periphery, on which an annular wall is fitted, and on which the annular wall is attached or can be attached.

[0043] In one preferred configuration, it may be envisaged that the milling body has at least one position marking visible from the outside on the outer surface of the hollow chamber, which position marking enables the determination of the position and orientation of the milling body in the CAM device, in which case the at least one position marking is preferably arranged in the region of at least one edge of the milling body, which is visible from the direction of the upper and / or lower surface of the milling body, in which case it is particularly preferred that at least two position markings are provided which are visible both from the upper and lower surface of the milling body.

[0044] This allows the position and orientation of the milling body in the CAM device to be measured and thereby checked by means of a camera or by means of another sensor (eg magnetically).

[0045] It may also be provided that the volume of the material of the annular wall is at most 1 / 2 the volume of the cavity, preferably that the volume of the material of the annular wall is at most 1 / 3 the volume of the cavity, and particularly preferably that the volume of the material of the annular wall is at most 1 / 5 the volume of the cavity.

[0046] This allows for greater material savings, and also opens up the possibility of providing a larger volume for the flowable polymerizable plastic to be filled, which allows larger or bulkier parts of the dental molding to be produced from the hardened plastic material formed by hardening of the flowable polymerizable plastic.

[0047] It may further be assumed that the solid body has an annular step, onto which the annular wall is fitted, so that the annular wall is in flush contact with the solid body on its inner surface, and in this case preferably the annular wall is glued to the solid body in the circumferential direction over its entire surface.

[0048] This simplifies production and allows the annular wall to be reused.Preferably, for this purpose it may be provided that the solid body has at least one stepped annular edge for the contact of a ring body or a tube piece as the annular wall.

[0049] The problem underlying the present invention is solved by a set for producing dental mouldings comprising the milling body according to the present invention as described above and at least one flowable polymerisable plastic and / or starting components for producing at least one flowable polymerisable plastic, preferably which set additionally comprises at least one device for filling with at least one flowable polymerisable plastic and / or for producing and mixing at least one flowable polymerisable plastic.

[0050] The flowable polymerizable plastic may be very viscous, but must be at least pasty and moldable at room or use temperature, but preferably has a low viscosity. Low viscosity plastics have a viscosity in the range of water or rapeseed oil at room temperature.

[0051] The set allows the complete production of dental moulds made of two different materials, thus completing the device.

[0052] The problem underlying the present invention is further solved by a method for producing a dental mould using the above-mentioned milling body or using such a set, in which the dental mould is produced from at least two different materials which are bonded to one another in the method, the method being characterised by the following chronological steps: A) forming, by subtractive CAM methods according to a virtual three-dimensional model of the contour of the dental form and of the shape of the bonding surfaces of the at least two different materials, in the bottom of the cavity of the milling body and in the first material of the milling body, a bonding surface between the at least two different materials and a negative of a partial area of ​​the surface of the dental form to be produced, whereby the bonding surface and the negative are in contact with each other and the annular wall of the milling body is maintained, B) filling the hollow chamber of the milling body and the volume at the bottom of the milling body removed in step A) with at least one fluid polymerizable plastic, the at least one fluid polymerizable plastic being filled into the hollow chamber at a predetermined filling level, so that the annular wall is in contact with at least the last filled or externally applied fluid polymerizable plastic of the at least one fluid polymerizable plastic, and hardening the at least one fluid polymerizable plastic in the hollow chamber and in the recess, resulting in a hardened plastic material in the hollow chamber of the milling body, which is firmly and flushly bonded to the first material of the milling body, when the at least one fluid polymerizable plastic hardens, and C) subtractively machining the hardened plastic material from the direction of the upper surface of the milling body by CAM methods according to the basal surface of the virtual model of the dental molding, and subtractively machining the first material from the direction of the lower surface of the milling body by CAM methods according to the occlusal surface of the virtual model of the dental molding, thereby subtractively producing the dental molding from the hardened plastic material and the first material bonded to the hardened plastic material.

[0053] In the present invention, it may be provided that in step C) subtractive machining of the base part of the hardened plastic material is performed from the direction of the upper surface of the milling body and subtractive machining of the bite part of the first material is performed from the direction of the lower surface of the milling body.

[0054] The first material preferably has a greater wear resistance according to the invention than the hardened plastic material resulting from polymerization of the flowable polymerizable plastic.

[0055] By dental molding is meant a molding used in dentistry or dental practice, the contour of which relates to an anatomically specific surface in the oral cavity of a patient. Examples in this respect are dental prostheses, partial dental prostheses, complete dental prostheses with individual teeth or tooth parts, night guards, orthognathic braces and parts of various moldings.

[0056] In the present invention, preferably, the dental molding to be produced from the milling body is a dental prosthesis. The milling body is particularly well suited for producing a dental prosthesis, or the advantages of the present invention are particularly effective when using the milling circular blank to produce a dental prosthesis. The same applies to the method according to the present invention, which is also particularly well suited for producing a dental prosthesis.

[0057] The difference between the at least two different materials may consist in the respective different shades of the at least two different materials, but may also alternatively or additionally be realized by various other physical properties, such as, for example, wear resistance, hardness, transparency, elastic deformability and / or elasticity.

[0058] By subtractive methods is meant, for example, material removal methods, such as milling methods, which are preferred in the present invention, and which can be particularly preferably carried out by means of a computer-controlled multi-axis mill as a CAM device.

[0059] The hardened plastic material is preferably biocompatible at least at the surface of the dental mould.

[0060] It may be provided that before step C) and preferably after step B), the milling body is fixed to the CAM device, in particular via a holder on the milling body.

[0061] Curing can be accomplished using a press ram which applies pressure to the flowable polymerizable plastic.

[0062] In the method according to the present invention, it may be assumed that a negative mold of a partial area of ​​the surface of the dental mold, which is produced in step A) at the bottom of the cavity of the milling body and in the first material of the milling body, is formed with an offset, in which case the offset extends the volume of the virtual model of the dental mold in areas where the dental mold should not consist of the first material.

[0063] The negative offset of a partial area of ​​the surface of the dental mold means an expansion of the surface of the mold, in particular a uniform expansion of the surface of the dental mold, which makes the dental mold larger in volume. This achieves that the subsequent subtractive processing is carried out in the direction of the lower surface of the milling body (in particular in the direction of the bite of the dental mold) in the hardened plastic without offsetting according to the virtual model. This ensures that after subtractive processing of the milling body in the direction of the lower surface of the milling body, no residues of the first material remain on the surface of the dental mold, and thus the aesthetic appearance and / or physical properties of the dental mold produced by the method are not negatively affected. The offset can be achieved, for example, in the present invention, by the fact that the surfaces of the virtual model of the dental mold, which are directed in the direction of the lower surface of the milling body and which should not consist of the first material, are supplemented by a predetermined distance vector by calculation. In this case, the distance vector may be directed toward the lower surface of the milling body, which results in a translation of the surface of the virtual model of the dental molding that should not be made of the first material. Alternatively, the distance vector may be arranged perpendicular to the surface of the virtual model of the dental molding, which results in the corresponding surface of the virtual model being uniformly expanded. Other equivalent or similar means for using the distance vector or other calculation methods to generate the offset can be easily imagined and realized by those skilled in the art.

[0064] It may further be assumed that the dental molding is a night guard, in which case the first material has a greater hardness than the hardened plastic material, or that the dental molding is a dental prosthesis in the form of a partial or complete dental prosthesis, in which case the dental prosthesis has a prosthesis base and at least one denture tooth, in which case the at least one denture tooth is manufactured from the first material and the prosthesis base is manufactured from the hardened plastic material, in which case the first material is tooth-coloured and the hardened plastic material is gum-coloured, in which case preferably the first material has a greater hardness and / or wear resistance than the hardened plastic material.

[0065] This achieves that the occlusal surfaces or dentures which are particularly heavily loaded when the dental molding is used have greater hardness and / or wear resistance than the basal surfaces of the dental molding which come into contact with the teeth and / or the oral mucosa, or that the prosthetic base supporting the dentures has other physical properties suited to the respective purposes.

[0066] As a higher hardness, in particular a higher Vickers hardness may be envisaged. Abrasion resistance refers to the resistance to material loss (tooth wear) due to frictional effects (tooth wear). The abrasion resistance of artificial teeth is an investigation of the wear behavior of artificial teeth in dentistry. The same applies to other materials used in occlusal surfaces. Methods for their measurement are known to those skilled in the art of dental technology, for example from WO 2016 / 008857 and the sources cited therein.

[0067] It may further be provided that in step B), at least one of the at least one flowable polymerizable plastics wets at least the surface formed in step A) of the first material throughout during filling.

[0068] This achieves the following: a stable bond is produced between the first material and the hardened plastic material.

[0069] Preferably, it may be provided that in step C), subtractive machining of the first material and the hardened plastic material is carried out by CAM methods from the direction of the underside of the milling body according to the occlusal surfaces of the virtual model of the dental moulding.

[0070] It may also be provided that in step C), subtractive machining of the hardened plastic material and the first material is carried out by the CAM method from the direction of the upper surface of the milling body according to the base surface of the virtual model of the dental molding.

[0071] It is particularly advantageous in the production of partial or complete dental prostheses if, in step C), in addition to subtractively machining the occlusal portion of the first material, the hardened plastic material is also machined in the occlusal portion by CAM methods from the direction of the underside of the milling body, so that the prosthesis base of the partial or complete dental prosthesis consists, at least over the entire visible or occlusal surface, of the hardened plastic material and is therefore gum-coloured and does not have any tooth-coloured areas which could impair the aesthetic appearance of the partial or complete dental prosthesis.

[0072] At the supporting surface on the edentulous jaw or oral mucosa, the tooth-colored first material may theoretically also be visible.

[0073] Also for other dental mouldings, machining of the hardened plastic material from the lower surface (occlusal direction) of the milling body and machining of the first material from the upper surface (basal direction) of the milling body may be advantageous.

[0074] It may further be envisaged that in step A) at least one marking is attached to the inner surface of the annular wall which defines the cavity of the milling body, in particular that the at least one marking is formed on the inner surface of the annular wall by a subtractive CAM method, in which case the distance of the at least one marking from the bottom of the cavity is determined depending on a virtual model of the dental molding, preferably in which case the at least one marking is at least one graduation line, in which case in step B) at least one flowable polymerizable plastic is filled into the cavity up to the height of the at least one marking.

[0075] This allows at least one flowable plastic material to be saved, less waste is generated, and the subsequent subtractive machining of the hardened plastic material from the upper surface of the milling body can be carried out more quickly, while protecting the tools of the CAM device used for this.

[0076] In this case, it may be assumed that at least one marking is formed on the inner surface of the annular wall in the area of ​​at least one existing marking, such as at least one scale. In this case, based on this marking or scale, the user may possibly estimate the amount of volume to be filled. This is particularly successful if the user knows the volume removed from the first material in step A) or this volume is displayed to the user on the display. This volume may be easily calculated based on a virtual model of the dental molding, minus the part to be produced from the first material, possibly with an offset, and from the position of the negative in the first material.

[0077] It may be envisaged that before step A) or before step B) and after step A), a ring body or a piece of tube is attached to the solid body, whereby the ring body or piece of tube forms an annular wall, in which case the ring body or piece of tube is preferably removed again after step B) and before step C).

[0078] This allows the use of rings or tube pieces that are suitable for other processes. Furthermore, in this way, a particularly simple design can be selected for the milling body. It may be envisaged that the rings or tube pieces are glued to the solid body, with the adhesive being applied to the circumferential direction and / or over the entire surface of the joining surface, thereby bonding the rings or tube pieces to the solid body in a liquid-tight manner. This prevents the flowable polymerizable plastic from leaking out of the cavity in step B).

[0079] It may further be envisaged that prior to step C), a zero point shift is calculated in order to determine the plane of the surface of the hardened plastic material formed in step B), in which case the zero point shift is taken into account in order for the subtractive processing in step C) to start in the plane of the surface of the hardened plastic material.

[0080] This allows the method to be shortened, since the tool starts in - or at least in the immediate vicinity of - the area where the hardened plastic material is present, rather than being guided in empty space to perform the subtractive process.

[0081] Furthermore, it may be provided that at least once in step C) the position and location of the milling body fixed in the CAM device is determined based on at least one marking on the milling body and that the position and location of the milling body is taken into account when controlling the CAM device, in which case preferably the determination of the position and location of the milling body fixed in the CAM device is determined fully automatically.

[0082] This ensures that the dental mold is produced in the desired manner from the milling body and the hardened plastic material, which is particularly important and beneficial if the milling body is newly mounted in the CAM device during step C).

[0083] It may be envisaged that preferably, after step A) and before step B), step A2) is carried out.

[0084] Step A2) consists in cleaning and / or pretreating the entire freely accessible surface of the first material at the bottom of the cavity, including the bonding surface or the bonding surface and the negative or the bonding surface and the negative, preferably during the pretreatment a chemical treatment of the surface of the first material, particularly preferably a chemical expansion of the surface of the first material by a monomer liquid, in which case the first material is a plastic composition containing or consisting of polymethyl methacrylate (PMMA).

[0085] This results in a particularly stable bond between the first material and the hardened plastic material.

[0086] It may furthermore be provided that the filling of at least one flowable polymerizable plastic in step B) is carried out by padding and / or is carried out in a pressure pot or pressure chamber at an overpressure, in particular at a pressure above normal pressure, preferably at least 150 kPa, particularly preferably at least 200 kPa, very particularly preferably at least 200 kPa and at most 400 kPa.

[0087] This allows the air trapped between the first material and the filled-in flowable polymerizable plastic to be evacuated, thus avoiding or reducing weak spots or surface damage in the dental molding.For this purpose, for example, the "Paramate Elite" pressure polymerization unit can be used.In addition, when packing or using overpressure during the filling of at least one flowable polymerizable plastic in step B), boiling bubbles, such as those that occur in plastics based on MMA, can be avoided.

[0088] It may be provided that the filling of at least one flowable polymerizable plastic in step B) is carried out by padding and / or is carried out under excess pressure, in particular in a pressure pot or pressure chamber having a pressure of at most 1000 kPa, preferably at most 500 kPa, particularly preferably at most 400 kPa.

[0089] It may furthermore be provided that the filling of at least one flowable polymerizable plastic in step B) is carried out by padding and / or is carried out under excess pressure, preferably at a pressure of at least 100 kPa and at most 1000 kPa, particularly preferably at least 150 kPa and at most 500 kPa, very particularly preferably at least 200 kPa and at most 400 kPa.

[0090] It may also be provided that the hardening of the flowable polymerizable plastic in step B) is carried out by the action of heat and / or pressure, with the hardening preferably taking place over a period of 10 to 120 minutes, particularly preferably 30 to 60 minutes.

[0091] This allows the hardened plastic material to achieve good strength. As the hardened plastic material produced from the flowable polymerizable plastic, preferably a high-temperature polymer or a low-temperature polymer is used, or as the flowable polymerizable plastic, a starting component of a high-temperature polymer or a low-temperature polymer is used. This makes the hardened plastic material or dental molding suitable for allergy sufferers. Therefore, a high-temperature polymer or a low-temperature polymer is also suitable for the first material, but preferably already final hardened.

[0092] The problem underlying the present invention is also solved by a dental molding, in particular a dental prosthesis or a night guard, which is produced by the method described above.

[0093] The unexpected finding on which the present invention is based is that the use of a cavity on the upper surface of a milling body for producing a dental mold for filling with a flowable polymerizable plastic as the second material, by selecting the position of the occlusal side of the dental mold during the CAD calculation of the corresponding CAM method, allows the amount of the first material to be subtractively milled out or removed to be reduced. In this case, it is sufficient to place the base surface of the more wear-resistant denture or the occlusal part of the dental mold in the bottom area of ​​the cavity. In this case, the lighter and more easily millable plastic for producing the prosthesis base or base part can be simply filled into the formed cavity, and at the same time, material savings of the second plastic material are also achieved here, since the cavity only needs to be filled to the desired height. In this case, any material savings, especially when processing wear-resistant materials, automatically lead to time savings and protection of the tools used.

[0094] According to the invention, a high fitting precision of the dental molding is achieved by directly milling the final form, in particular by the milling body, the set and the method according to the invention. No effort is required when gluing the denture, and no unevenness due to the bonding process occurs in the dental molding. At the same time, a particularly wear-resistant material for the denture can be obtained by completely curing the solid body of the first material, and a particularly aesthetically attractive denture material can be obtained by using a layered first material. In the dental prosthesis, a natural color transition from the gum color to the tooth color occurs at the right place, and in this case no compromises are made. In this case, a particularly high esthetics can be achieved by using a multi-layer milling disk as the tooth-colored solid body.

[0095] The manufacturing of the milling bodies according to the invention by the method according to the invention can be carried out in only two manufacturing steps. That is, a two-step method can be used to manufacture dental moldings. Furthermore, blanks or milling bodies with various shape variations are not required. However, a very small set of milling blanks with different sizes can also be used or such a very small set can be advantageous.

[0096] The hollow space of the milling body allows for a reduction in milling effort with less required material removal and tool or mill wear. The user can determine and change the color tone of the flowable polymerizable plastic itself, for example by selecting or forming a modified appearance. The fill markings located on the inside, which may already be provided or may be formed in the first milling step, allow for a reliable filling process before the second milling step.

[0097] One exemplary method according to the invention for producing a dental prosthesis (total or partial dental prosthesis as a dental molding) may have the following sequence:

[0098] 1. The prosthetic work is digitally designed and divided into several data segments. What is needed is data for the occlusal or upper oral surface of the dental prosthesis, the lower surface of the base, as well as intermediate surface data as a bonding surface consisting of the base surface of the tooth-colored part and the upper surface (oral side) of the gum-colored part. When creating the data for the occlusal or upper oral surface, an additional offset for the gum-colored part is optionally provided in the CAD.

[0099] 2. Develop a suitable milling strategy for handling the individual process steps: What is needed is a one-sided machining of the bottom side as well as a zero point shift that is adapted to the milling body used, and preferably a separate zero point shift for both sides machining with corresponding, separate zero point shifts for the top and bottom sides.

[0100] 3. Fix a milling body or a tooth-colored solid body of the milling body, the size of which corresponds at least to the tooth-colored part, in a milling machine and mill the mid-surface data and the data relating to the occlusion or upper oral surface of the prosthesis base from the base, possibly with a slight offset of the gum-colored part (of the prosthesis base) in the oral direction. The milling body or the tooth-colored solid body can preferably be provided with position markings before positioning, which allow repositioning.

[0101] 4. The partially milled blank is removed, and if the milling body does not already have a cavity defined by an annular wall at its upper surface, a cylindrical ring body is optionally placed as the annular wall of the milling body in order to form a cavity at its upper surface for easier filling of the milled-out area and the required additional volume, in which case the annular wall is preferably formed integrally with the solid body of the milling body.

[0102] 5. The cavity is filled or partially filled with prosthetic material in the form of a flowable polymerizable plastic (preferably a powder-liquid system) and polymerized in an analog manufacturing process, after which the support ring is optionally removed and the hardened plastic material is optionally subjected to the required post-treatment, for example by storage in water.

[0103] 6. Reposition the filled and partially milled blank in the milling machine and mill the external geometry in the base and oral areas according to the final prosthesis design.

[0104] In order to reduce the milling work, if a milling body is used which has a tooth-colored solid body and a hollow mold formed on one side at the same time, the attachment of the cylindrical ring body described in 4. can be omitted.

[0105] A fill mark or another suitable indicia can be attached to the hollow mold during step 3., thereby enabling the user to inspectably ensure sufficient, but not unduly slow, filling of the flowable polymerizable plastic by the user in step 5.

[0106] At the end of the method, the dental prosthesis can be polished and / or surface-conditioned by chemical treatment.

[0107] Exemplary embodiments of the invention will now be described with reference to 11 diagrammatically illustrated, non-limiting figures. [Brief description of the drawings]

[0108] [Figure 1] FIG. 2 is a schematic perspective view showing the top surface of a first milling body according to the invention; [Diagram 2] FIG. 2 is a schematic perspective view showing a side view of a second milling body according to the present invention; [Diagram 3] FIG. 2 is a schematic perspective view of the occlusal side of a dental prosthesis manufactured by the method according to the invention with a milling body according to the invention; [Figure 4] 4 is a schematic side view of the milling body shown in FIG. 2 together with the cross section and position of the dental prosthesis shown in FIG. 3 which is to be manufactured using this milling body; [Diagram 5] FIG. 5 is a schematic side view of the milling body shown in FIGS. 2 and 4, together with a cross section and position in another cross section of the dental prosthesis shown in FIG. 3, which is to be manufactured using this milling body. [Figure 6] FIG. 6 is a perspective view showing a schematic representation of the position of the dental prosthesis shown in FIG. 3 in the milling body shown in FIGS. 2, 4 and 5. [Figure 7] 7 is a perspective view showing a schematic view of the upper surface of the milling body shown in Figures 2 and 4 to 6, together with a base portion of the prosthesis base of the dental prosthesis shown in Figure 3 protruding from the bottom of the hollow chamber. [Figure 8] 8 is a side view showing a cross section of the dental prosthesis shown in FIG. 3, which is to be manufactured using the milling body shown in FIG. 2 and FIG. 4 to FIG. 7, together with the position of the occlusal surface. [Figure 9] FIG. 9 shows a schematic view of the upper surface of the milling body shown in FIGS. 2 and 4 to 8 after subtractive production of the negative for the bonding surfaces and the oral side of the prosthesis base. [Figure 10] FIG. 2 shows a schematic representation of the base side of a dental prosthesis after it has been subtractively fabricated from pre-filled and then hardened plastic material. [Figure 11] FIG. 2 shows a schematic representation of the occlusal or oral side of a dental prosthesis after it has been subtractively fabricated from a first material and a pre-filled, polymerized and hardened plastic material.

[0109] In Fig. 1 a schematic perspective view of the top side (top of Fig. 1) of a first milling body 1 according to the invention is shown. The milling body 1 has a solid body 2 of a first material, which extends to a bottom side (not visible in Fig. 1) located opposite the top side of the milling body 1. The first material may be a fully polymerized tooth-coloured plastic, which is suitable for the production of dentures and has the necessary wear resistance for this purpose. The first material is preferably already biocompatible in the milling body 1 in order to be suitable for application in the patient's oral cavity.

[0110] A hollow space 4 with a bottom 6 is arranged on the upper side of the milling body 1, the hollow space 4 being delimited laterally by an annular wall 8. The bottom 6 is (preferably completely) formed by the solid body 2. The annular wall 8 may consist of the first material or may consist of another material. In particular, the annular wall 8 may be a ring or a tube section which is pushed onto the solid body 2 and firmly connected thereto. The connection may be made by gluing. The solid body 2 may be cylindrical. In order to push on a ring or a tube section as the annular wall 8, the solid body 2 may have a step on its outer periphery, onto which the ring or tube section is pushed flush. The annular wall 8 may in particular be a cylindrical tube section. The annular wall 8 may also be a metal ring.

[0111] Markings 9 for measuring the filling level in the cavity 4 can be arranged on the inner surface of the annular wall 8 facing the cavity 4. However, the markings 9 can also be applied to the annular wall 8, for example milled in, only during the process for producing a dental molded body. On the basis of the markings 9, the cavity 4 can be filled to the correct height with a flowable polymerizable plastic (not shown in FIG. 1).

[0112] At least one holding part 10 for fixing the milling body 1 in a CAM device can be arranged on at least one outer wall of the milling body 1. The holding part 10 can project from the outer wall of the milling body 1 as a fitted torus with a rectangular cross section. As an alternative to the holding part 10 shown in FIG. 1, the holding part can also be realized in another way, for example by a protruding projection or by a lateral recess. The holding part 10 is used for fixing in a CAM device (not shown).

[0113] The milling body 1 shown in FIG. 1 can be used in the method according to the invention as follows: The milling body 1 is fixed via the holder 10 in a subtractive CAM device, such as a computer-controlled multi-axis mill. Using a virtual CAD model of the dental mould to be produced, a surface is produced in the base 6 which corresponds to the bonding surface between the first material and the hardened plastic material to be produced from the flowable polymerizable plastic according to the virtual CAD model. Furthermore, the occlusal or oral surface of the surface made of the hardened plastic material is produced from the solid body 2 as a negative model by means of the subtractive CAM device. In this case, an offset can be used, so that the negative model is produced in the solid body 2 somewhat deeper, preferably at least a few tenths of a millimetre deeper, than the occlusal or oral surface would require for the hardened plastic material in a direct negative model based on the CAD model. Additionally, markings 9 can be produced on the annular wall 8 for the first time in this step. The surface newly produced in this way in the base 6 of the solid body 2 can then be cleaned.

[0114] A flowable polymerizable plastic (not shown) can then be filled into the cavity 4, i.e. to a height sufficient to allow the part of the dental molding consisting of the hardened plastic material to be produced from the hardened plastic material completely on the basal side in accordance with the virtual CAD model. The flowable polymerizable plastic can be hardened under the action of pressure and heat to form the hardened plastic material. The intermediate product can then be mounted again in a subtractive CAM device, and the dental molding can be produced by the CAM device on the basis of the occlusal or buccal and basal surfaces of the virtual CAD model of the dental molding. In this case, a first part of the dental molding (e.g. a denture) consists of the first molding material, and a second part of the dental molding (e.g. a prosthesis base) consists of the hardened plastic material.

[0115] As an alternative to dental prostheses, the method can also be used to manufacture night guards, the occlusal surfaces of which consist of a first material and the basal surfaces of the night guard that contact the patient's teeth consist of a hardened plastic material, which can be used to combine suitable material properties and / or produce aesthetically appealing color gradations.

[0116] In Fig. 2, a schematic perspective view of a second milling body 11 according to the invention is shown in a side view. The milling body 11 has a solid body 12 of a first material. The solid body 12 extends to a lower surface 19 arranged on the side opposite the upper surface 21 of the milling body 11. The first material can be a fully polymerized tooth-colored plastic, which is suitable for the production of dentures and has the necessary wear resistance for this purpose. The first material is preferably biocompatible already in the milling body 1 in order to be suitable for application in the patient's oral cavity.

[0117] A cavity 14 with a bottom 16 is arranged on the upper surface 21 of the milling body 11, the cavity 14 being delimited laterally by an annular wall 18. The bottom 16 is preferably formed completely by the solid body 12. The annular wall 18 may consist of the first material or may consist of another material. In particular, the annular wall 18 may be a ring body or a tube piece which is pushed onto the solid body 12 and is firmly connected thereto. The connection may be made by gluing. The solid body 12 may be cylindrically shaped. The annular wall 18 may be a cylindrical tube piece. The annular wall 18 may also be a metal ring body.

[0118] Markings (not visible in FIG. 2) for measuring the filling level in the cavity 14 can be arranged on the inner surface of the annular wall 18 facing the cavity 14. However, the markings can also only be applied to the annular wall 18, for example milled in, during the course of the method according to the invention. On the basis of the markings, the flowable polymerizable plastic (not shown in FIG. 2) to be filled into the cavity 14 can be filled to the correct height.

[0119] At least one outer wall of the milling body 11 may have at least one holding part 20 arranged thereon for fixing the milling body 11 in a CAM device. The holding part 20 may protrude from the outer wall of the milling body 11. The holding part 20 may be formed by a protruding annular ring.

[0120] In Fig. 3, a schematic perspective view of a dental prosthesis 22 produced by the method according to the invention with the milling body 1, 11 according to the invention is shown. The dental prosthesis 22 has a prosthesis base 24 made of a gum-coloured hardened plastic material. A number of artificial teeth 26 can be connected to the prosthesis base 24 as a one-piece dentition. The artificial teeth 26 are made of a first material, are tooth-coloured and are preferably structured in a colour-layered manner in order to ensure a particularly good aesthetic appearance. The artificial teeth 26 and the prosthesis base 24 are directly connected to each other when they are produced by the method according to the invention. In Fig. 3, an occlusal or oral surface 28 of the dental prosthesis 22 can be seen. The dental prosthesis 22 is generated using a virtual CAD model that has been designed beforehand in a known manner on the basis of patient data and possibly further processing, the virtual CAD model being divided by calculation into a tooth-colored part for the dentures 26 and a gum-colored part for the prosthesis base 24 in order to carry out the method according to the invention. In addition to data relating to the occlusal or oral surface 28 of the dental prosthesis 22, the virtual CAD model also contains data relating to the basal side (not visible in FIG. 3) of the dental prosthesis 22 opposite the occlusal or oral surface 28, as well as data relating to the bonding surface between the dentures 26 and the prosthesis base 24. In this case, the bonding surface is preferably located inside the dental prosthesis 22. The diagram shown in FIG. 3 therefore also corresponds to the outer shape of the virtual CAD model.

[0121] The flow of the method according to the present invention will be described below by way of example with reference to Figures 4 to 10, using the milling body 11 shown in Figure 2 and the virtual CAD model of the dental prosthesis 22 shown in Figure 3.

[0122] For this purpose, FIG. 4 shows a schematic side view of the milling body 11 shown in FIG. 2 with a cross section and the position of the dental prosthesis 22 shown in FIG. 3, which is to be produced with the milling body 11. That is, a virtual CAD model of the dental prosthesis 22 is written on or in the milling body 11 at the desired position of the milling body 11. This is also useful in the following figures, in that it is possible to imagine how the dental prosthesis 22 to be produced is located in the milling body 11 before production. In this case, the artificial tooth 26 is positioned in the milling body 11 so that it is completely contained in the area of ​​the solid body 12 of the first material. This can be seen somewhat better in the cross section shown in FIG. 5 than in FIG. 4, since in FIG. 5 the virtual CAD model of the dental prosthesis 22 is shown cut through the artificial tooth 26. In contrast, the base surface 30 of the virtual CAD model of the dental prosthesis 22 is partially located in the cavity 14 which will later be filled with a flowable polymerizable plastic. This can be seen somewhat better in the perspective view shown in Figure 6 and especially in the schematic perspective view of the top of the milling body 11 shown in Figure 7, in which the base part of the prosthesis base 24 of the dental prosthesis 22 protruding from the bottom 16 of the cavity 14 can be seen.

[0123] First, the occlusal or oral surface 28 of the prosthesis base 24 and the bonding surface between the dentures 26 and the prosthesis base 24 are formed in the solid body 12 of the milling body 11 on the basis of a virtual CAD model by means of a subtractive CAM device, such as a computer-controlled multi-axis mill. For this purpose, a surface corresponding to the bonding surface between the first material and the hardened plastic material to be produced from the flowable polymerizable plastic is formed in the bottom 16 according to the virtual CAD model using the virtual CAD model. Furthermore, the occlusal or oral surface 28 of the surface made of the hardened plastic material is produced from the solid body 12 as a negative mold 31 by means of a subtractive CAM device. In this case, an offset can be used, so that the negative mold 31 is produced in the solid body 12 at least a few tenths of a millimeter deeper than the occlusal or oral surface 28 would otherwise require for the hardened plastic material. The negative mold 31 is thus used as a casting mold for producing the occlusal or oral side of the prosthesis base 24. The surface thus formed in the first material can be seen well in the schematic top view of the milling body 11 thus processed, shown in Fig. 9. The bonding surface between the denture 26 and the prosthesis base 24 corresponds in Fig. 9 to the surface formed by the area of ​​the solid body 12, which is part of the denture 26 and which is already characterized as such in Fig. 9. In this bonding surface of the denture 26 a number of recesses 27 are located, which are filled with a flowable polymerizable plastic for a more stable bond.

[0124] Additionally, markings can be made on the annular wall 18. The thus newly formed surface can then be cleaned. The cavity 14 shown in FIG. 9 can then be filled or blocked with a flowable polymerizable plastic up to the markings. The flowable polymerizable plastic can then be cured (preferably under pressure and / or at an elevated temperature compared to room temperature) (preferably for 30-60 minutes), thereby forming a cured plastic material 32 (see FIG. 10), from which the prosthesis base 24 is manufactured.

[0125] After hardening, the intermediate product thus obtained is clamped again in a subtractive CAM device (multi-axis mill) and the occlusal or oral surface 28 of the dental prosthesis 22 (now without offset) as well as the basal surface 30 of the dental prosthesis 22 are subtractively produced from the intermediate product in accordance with the virtual CAD model of the dental prosthesis 22. For this purpose, FIG. 10 shows a schematic representation of the basal side 30 of the dental prosthesis 22 after the machining of the occlusal or oral side 28 has been completed and before the dental prosthesis 22 is removed from the remaining milling body 11. Finally, FIG. 11 shows the dental prosthesis 22 removed from the annular wall 18. For final completion, cleaning, polishing and / or surface treatment of the dental prosthesis 22 can be carried out as post-processing.

[0126] The features of the invention disclosed in the above description and in the claims, the drawings and the examples may be important both individually and in any arbitrary combination for realizing the invention in its various embodiments. [Explanation of symbols]

[0127] 1,11 Milling body 2,12 Solid body 4,14 Hollow chamber 6,16 bottom 8,18 Wall 9. Marking 10,20 Holding part 19 Bottom side 21 Top side 22 Dental prostheses 24 Prosthesis Base 26 Dentures 27 Recess 28 Occlusal surface / oral surface 30 Basal surface 31 Negative type 32 Plastic materials

Claims

1. A milling body (1, 11) for producing dental mouldings, said milling body (1, 11) having a solid body (2, 12) made of a first material, said first material being biocompatible, 1. A milling body (1, 11), characterized in that in an upper surface (21) of the milling body (1, 11) a hollow space (4, 14) for accommodating a flowable polymerizable plastic is arranged, the hollow space (4, 14) having a bottom (6, 16) and that, starting from the edge of the bottom (6, 16), the hollow space (4, 14) is laterally bounded by an annular wall (8, 18) which is ring-shaped, the first material forming the bottom (6, 16), and the solid body (2, 12) extends to a lower surface (19) of the milling body (1, 11) which is arranged opposite the upper surface (21) of the milling body (1, 11).

2. the annular wall (8, 18) has a wall thickness of at most 20 mm, preferably at most 10 mm, particularly preferably at most 5 mm, and / or The height of the annular wall (8, 18) is at least 5 mm, preferably at least 15 mm. Milling body (1, 11) according to claim 1.

3. 3. The milling body (1, 11) according to claim 1 or 2, characterized in that on at least one inner surface of the annular wall (8, 18) which defines the cavity (4, 14), a marking (9) for measuring the filling level in the cavity (4, 14) is arranged, preferably the marking (9) having a scale with equally spaced graduation lines and / or numerical values, particularly preferably a vertical scale for measuring the filling height or volume of the flowable polymerizable plastic in the cavity (4, 14).

4. 4. The milling body (1, 11) according to claim 1, wherein the bottom (6, 16) of the cavity (4, 14) is flat and / or the annular wall (8, 18) has a cylindrical surface with respect to the interior of the cavity (4, 14), preferably the annular wall (8, 18) is tubular.

5. the annular wall (8, 18) of the milling body (1, 11) is formed by a piece of tube or a ring fixed to the solid body (2, 12), preferably the milling body (1, 11) consists of the first material and the piece of tube or the ring, or the annular wall (8, 18) of the milling body (1, 11) is made of the first material, preferably the solid body (2, 12) and the annular wall (8, 18) are formed integrally, whereby the milling body (1, 11) is made of the first material; Milling body (1, 11) according to any one of the preceding claims.

6. the first material is a first plastic material, preferably the first plastic material has been final cured; and / or the first material is a laminated first plastic material with a plurality of layers of different shades, the layer planes of the layers being preferably arranged parallel to the bottom (6, 16) of the cavity (4, 14) or parallel to a plane perpendicular to the annular wall (8, 18), in particular parallel to a base surface of the cylindrical inner wall of the annular wall (8, 18); Milling body (1, 11) according to any one of the preceding claims.

7. 7. The milling body (1, 11) according to claim 1, wherein the milling body (1, 11) is a circular blank with a cylindrical outer periphery, the annular wall (8, 18) forming a partial region of the cylindrical outer periphery, and preferably a holding portion (10, 20) for fixing the circular blank to a CAM device is arranged on the outer surface of the cylindrical outer periphery, and particularly preferably the holding portion (20) is a protruding ring surrounding the cylindrical outer periphery.

8. 8. The milling body (1, 11) according to claim 1, wherein the milling body (1, 11) has at least one position marking visible from the outside on the outer surface of the hollow chamber (4, 14), which position marking enables the position and orientation of the milling body (1, 11) to be determined in a CAM device, the at least one position marking being preferably arranged in the region of at least one edge of the milling body (1, 11) visible from the direction of the upper surface (21) and / or the lower surface (19) of the milling body (1, 11), and particularly preferably wherein at least two position markings are provided which are visible both from the upper surface (21) and from the lower surface (19) of the milling body (1, 11).

9. 9. A milling body (1, 11) according to any one of claims 1 to 8, wherein the volume of the material of the annular wall (8, 18) is at most 1 / 2 the volume of the hollow chamber (4, 14), preferably the volume of the material of the annular wall (8, 18) is at most 1 / 3 the volume of the hollow chamber (4, 14), particularly preferably the volume of the material of the annular wall (8, 18) is at most 1 / 5 the volume of the hollow chamber (4, 14).

10. 10. The milling body (1, 11) according to claim 1, wherein the solid body (2, 12) has an annular step on which the annular wall (8, 18) is fitted so that the annular wall (8, 18) is in flush contact with the solid body (2, 12) on its inner surface, and preferably the annular wall (8, 18) is bonded to the solid body (2, 12) over its entire surface in the circumferential direction.

11. A set for producing dental mouldings comprising a milling body (1, 11) according to any one of claims 1 to 10 and at least one flowable polymerisable plastic and / or starting components for producing at least one flowable polymerisable plastic, preferably further comprising at least one device for filling the at least one flowable polymerisable plastic and / or for producing and mixing the at least one flowable polymerisable plastic.

12. 12. A method for producing a dental mould using a milling body (1, 11) according to any one of claims 1 to 10 or using a set according to claim 11, in which the dental mould is produced from at least two different materials which are bonded to one another in the method, The method comprises the following chronological steps: A) generating, by subtractive CAM-methods according to a virtual three-dimensional model of the contour of the dental mould and of the shape of the bonding surfaces of the at least two different materials, in the bottom (6, 16) of the cavity (4, 14) of the milling body (1, 11) and in the first material of the milling body (1, 11), the bonding surfaces between the at least two different materials and a negative (31) of a partial area of ​​the surface of the dental mould to be produced, the bonding surfaces and the negative (31) being in contact with each other and the annular wall (8, 18) of the milling body (1, 11) being maintained, B) filling at least one fluid polymerizable plastic into the hollow space (4, 14) of the milling body (1, 11) and into the volume in the bottom part (6, 16) of the milling body (1, 11) removed in step A), wherein the at least one fluid polymerizable plastic is filled into the hollow space (4, 14) at a predetermined filling level, so that the annular wall (8, 18) is filled with at least one of the fluid polymerizable plastic. and hardening said at least one fluid polymerizable plastic in said cavity (4, 14) and in said recesses, resulting in a hardened plastic material in said cavity (4, 14) of said milling body (1, 11) which is firmly and flushly bonded to said first material of said milling body (1, 11) upon hardening of said at least one fluid polymerizable plastic. C) subtractively machining the hardened plastic material in the direction of the upper surface (21) of the milling body (1, 11) by a CAM method in accordance with the basal surface of the virtual model of the dental moulding and subtractively machining the first material in the direction of the lower surface (19) of the milling body (1, 11) by a CAM method in accordance with the occlusal surface of the virtual model of the dental moulding, thereby subtractively producing the dental moulding from the hardened plastic material and the first material bonded to the hardened plastic material. A method comprising:

13. 13. The method according to claim 12, further comprising forming the negative (31) of a partial area of ​​the surface of the dental mould, which is produced in step A) at the bottom (6, 16) of the cavity (4, 14) of the milling body (1, 11) and in the first material of the milling body (1, 11), with an offset, which extends the volume of the virtual model of the dental mould in areas where the dental mould should not consist of the first material.

14. the dental form is a night guard and the first material has a greater hardness than the hardened plastic material; or the dental moulding is a dental prosthesis (22) in the form of a partial or complete dental prosthesis, the dental prosthesis (22) having a prosthesis base (24) and at least one false tooth (26), the at least one false tooth (26) being manufactured from the first material and the prosthesis base (24) being manufactured from the hardened plastic material, the first material being tooth-coloured and the hardened plastic material being gum-coloured, preferably the first material having a greater hardness and / or wear resistance than the hardened plastic material, 14. The method according to claim 12 or 13.

15. 15. The method according to claim 12, wherein in step B) at least one of the at least one flowable polymerizable plastics wets at least the entire surface formed in step A) of the first material during filling.

16. In step C), subtractive machining of the first material and the hardened plastic material according to the occlusal surface of the virtual model of the dental moulding is carried out by the CAM method from the direction of the underside (19) of the milling body (1, 11); and / or 16. The method according to claim 12, further comprising subtractive machining of the hardened plastic material and the first material according to the base surface of the virtual model of the dental moulding by the CAM method from the direction of the top surface (21) of the milling body (1, 11) in step C).

17. In step A), at least one marking (9) is attached to the inner surface of the annular wall (8, 18) which delimits the cavity (4, 14) of the milling body (1, 11), in particular said at least one marking (9) is formed on said inner surface of the annular wall (8, 18) by means of the subtractive CAM method, and the distance of said at least one marking (9) from the bottom (6, 16) of the cavity (4, 14) is determined depending on the virtual model of the dental mould, preferably said at least one marking (9) being at least one graduation line, In step B), the at least one flowable polymerizable plastic is filled into the cavity (4, 14) up to the height of the at least one marking (9), 17. The method according to any one of claims 12 to 16.

18. 18. The method according to claim 12, further comprising attaching a ring or a tube piece to the solid body (2, 12) before step A) or before step B) and after step A), whereby the ring or the tube piece forms the annular wall (8, 18), and preferably removing the ring or the tube piece again after step B) and before step C).

19. 19. The method according to claim 12, further comprising calculating a zero point shift prior to step C) in order to determine the plane of the surface of the hardened plastic material formed in step B), and taking into account said zero point shift in step C) so that the subtractive processing starts in the plane of the surface of the hardened plastic material.

20. 20. The method according to claim 12, further comprising determining at least once in step C) the position and location of the milling body (1, 11) fixed in the CAM device based on at least one marking provided on the milling body (1, 11) and taking said position and location of the milling body (1, 11) into account when controlling the CAM device, preferably determining said position and location of the milling body (1, 11) fixed in the CAM device fully automatically.

21. After step A) and before step B), step A2) is carried out, step A2) is cleaning and / or pre-treating the entire freely accessible surface of the first material at the bottom (6, 16) of the cavity (4, 14), including the bonding surface or the bonding surface and the negative form (31) or the bonding surface and the negative form (31), preferably during pre-treatment a chemical treatment of the surface of the first material, particularly preferably a chemical expansion of the surface of the first material with a monomer liquid, the first material being a plastic composition containing or consisting of polymethyl methacrylate (PMMA); 21. The method according to any one of claims 12 to 20.

22. 22. The method according to claim 12, wherein the filling of the at least one flowable polymerizable plastic in step B) is carried out by padding and / or in a pressure pot or pressure chamber at an overpressure, in particular at a pressure above normal pressure, preferably at least 150 kPa, particularly preferably at least 200 kPa, very particularly preferably at least 200 kPa and at most 400 kPa.

23. 23. The method according to claim 12, wherein the filling of the at least one flowable polymerizable plastic in step B) is carried out by padding and / or is carried out in a pressure pot or pressure chamber at excess pressure, in particular with a pressure of up to 1000 kPa, preferably with a pressure of up to 500 kPa, particularly preferably with a pressure of up to 400 kPa.

24. 24. The method according to claim 12, wherein the hardening of the flowable polymerizable plastic in step B) is effected by the action of heat and / or pressure, preferably the hardening is effected for a period of 10 min to 120 min, particularly preferably 30 min to 60 min.

25. A dental molding, in particular a dental prosthesis (22) or a night guard, produced by the method according to any one of claims 12 to 24.

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