Milling blanks and methods for producing dental compacts

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 shapes such as partial or complete dental prostheses or night guards, as well as a method for producing dental shapes using such a milling blank. The milling blank is intended for and suitable for subtractive processing, and the dental shapes produced from the milling blank must be insertable into a patient's oral cavity for dental applications.

[0002] In addition to craftsmanship, digital manufacturing methods are also becoming increasingly important in the field of dentistry. Dentures and other dental components, such as dental prostheses, crowns, bridges, and night guards, have been produced subtractively and by milling using CAD / CAM technology for several years (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, which include prosthesis bases that support dentures fixed or placed above and within the gums.

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

[0004] Methods exist for digitally creating and manufacturing partial or complete dental prostheses using CAD / CAM techniques, such as those disclosed in German Patent Application Publication No. 102009056752 or International Publication No. 2013 / 124452. In a method for manufacturing dentures, known from German Patent Application Publication No. 10304757, teeth are virtually created in a virtual model, and a prosthesis base is manufactured based on this virtual model. In a method disclosed in European Patent Application Publication No. 2742906, a 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 the virtual model of the dental arch is positioned and oriented by calculation to fit as closely as possible to the virtual model of the prosthesis base.

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

[0006] WO 2016 / 091762 discloses a method for manufacturing a dental prosthesis, which involves creating a model that can be used to fix multiple dentures to a prosthesis base in a desired position and orientation relative to one another. The dentures are then shortened by base grinding in the cervical region, thereby creating a desired occlusal vertical dimension. WO 2016 / 110392 discloses a method for manufacturing a dental prosthesis, which involves inserting plastically deformable connecting means into the alveoli of the prosthesis base, thereby enabling manual correction of the positioning of the dentures on the prosthesis base. German Patent No. 102008019694 discloses a method and apparatus for manufacturing a dental mold from ceramic using a laser. In a method for manufacturing a dental prosthesis known from EP 2571451 and EP 2666438, prefabricated dentures are embedded in wax in a holder, and then the neck is removed using CAM techniques. To adapt the tooth height to the patient's jaw, i.e., to adjust the vertical occlusal dimension of the dental prosthesis to the patient's needs, it is necessary to shorten the base (or neck) of the dentures. WO 2014 / 159436 discloses a laminated dental prosthesis with a reinforcement material at the base, which is poured into the cavity of the base. In addition to dental prostheses, other dental moldings, such as night guards, can also be digitally manufactured based on patient data using subtractive CAM techniques. A disadvantage of such night guards is that they must be sufficiently wear-resistant, which reduces wearing comfort on the teeth. Furthermore, the possibilities for aesthetic modification of the night guard are limited.

[0007] In both additive and subtractive manufacturing, the bonding of the base and the tooth-colored part (denture) is a major challenge. Bonding is usually achieved by adhesive bonding, where using too little or too much adhesive compromises the quality of the transition and the correct positioning of the denture during bonding. Similarly, available one-piece two-color (gingival and tooth-colored) milling blanks certainly have very good layer bonding, but due to the predetermined phase boundaries, esthetics are always a compromise and therefore unsatisfactory.

[0008] U.S. Patent Application Publication No. 2013 / 0101962 discloses a method for manufacturing a dental prosthesis, in which multiple recesses are milled into a block along the dental arch, and the recesses are filled with multiple plastics while a denture is manufactured from the hardened plastics. The block is then fully removed, and a prosthesis base is manufactured from the block. This method is a multi-stage milling method. The method according to U.S. Patent Application Publication No. 2013 / 0101962 has disadvantages due to the high material loss, the time required to remove material from the block, and the wear of the tools required for this. In a reverse method for manufacturing a dental prosthesis, known from EP 2915503, a milling blank is subtractively machined from a tooth-fused material to form a cavity used as a negative mold for the prosthesis base of the dental prosthesis. The occlusal and basal sides of the dental prosthesis are then subtractively produced from the composite thus produced. This is also a multi-stage milling method. A disadvantage of the method according to EP 2915503 is that a very large amount of relatively hard tooth-fusible material must be removed to produce the dental prosthesis. This not only results in a large loss of tooth-fusible material, but also places a concentrated load on the milling tool and requires a relatively long time to perform the method. Furthermore, if the tooth-fusible material is not completely removed from the outer surfaces (occlusal and buccal sides) of the prosthesis base, esthetically disturbing white or tooth-colored residues may remain, which must then be manually removed by the dental technician. This, again, can result in an undesirably thin material thickness at the prosthesis base.

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

[0010] 1. Milling or printing a gum-colored base and gluing it onto an artificial tooth, alternatively onto a milled or printed tooth-colored segment. Potential drawbacks include inaccurate production, time-consuming procedures, aesthetic issues due to excess adhesive or incomplete filling of marginal gaps, and limitations regarding milling of cavities due to undercuts.

[0011] 2. Milling pre-manufactured 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 gum color to tooth color, which is always a compromise and not aesthetically pleasing.

[0012] 3. Milling preformed bodies with prefabricated teeth already installed. These methods mainly only allow the individual production of the base side of the prosthesis. The disadvantage in this case 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, formed by multiple milling operations and refilling the removed cavities. The disadvantages of this method are high material loss and time.

[0014] The present invention aims to overcome the drawbacks of the prior art. In particular, it seeks to provide a method and milling body for producing dental moldings made of two different materials firmly bonded to one another, which method and milling body enable rapid and resource-efficient production of dental moldings using subtractive CAM methods. It is desirable that the bonding of the materials be performed without the use of adhesives as adhesion promoters. It is particularly desirable that the two materials be directly bonded to one another within the scope of the method. For this purpose, it is desirable that the milling body already possesses suitable characteristics, so that the method can be carried out as simply and effortlessly as possible. It is desirable that the method be as simple and effortless as possible for the dental technician to carry out, and that the milling body possess suitable characteristics for carrying out the method. It is particularly desirable that fully automated or as fully automated as possible, such as CAD / CAM technology, be 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 to 10 and 13 to 24.

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

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

[0018] Theoretically, the annular wall could be realized by a separate annular piece or a separate tube piece that is first fitted onto the solid body immediately before or during the application of the manufacturing method and then firmly connected to the solid body or in another way, so that 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 polymethyl methacrylate (PMMA) or a PMMA-containing plastic composition and / or a high temperature polymer.

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

[0021] Preferably, before being processed by the method for producing a dental mold, the cavity does not have a surface that is directly defined by the outer surface of the dental mold to be produced, in particular, it does not have the contours of the teeth, dental arches and / or prosthesis bases, and only the dimensions may preferably be adjusted to the typical or maximum size of the dental mold.

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

[0023] In the milling body according to the invention, it may be provided that 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] With respect to its dimensions, the milling body is thereby well suited for use as a semi-finished product for producing dental moulds.

[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 being significant and sufficient for dental moldings.

[0028] It may further be assumed that markings for measuring the filling level in the cavity are arranged on at least one inner surface of the annular wall that defines the cavity, and in this 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 material waste and simultaneously reducing the time required for subsequent subtractive processing of the milling body, potentially also protecting the milling tool.

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

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

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

[0033] It may 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 the milling body preferably consists of the first material and the tube piece or ring body, or that the annular wall of the milling body consists of the first material, in which case the solid body and the annular wall are preferably formed integrally, whereby the milling body consists of the first material.

[0034] Both measures allow for a simple and inexpensive manufacture of the milling body.

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

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

[0037] The plastic material can be manufactured inexpensively. By using a first plastic material that has been final-cured, it is possible to prevent the shape of the first plastic material from changing after milling 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 multiple 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 perpendicular to the annular wall, in particular parallel to a plane arranged parallel to the base surface of the cylindrical inner wall of the annular wall.

[0039] This allows for the production of aesthetically appealing dental moldings from the first material. This is particularly important when producing dentures from the first material. Therefore, the first material according to the present invention is preferably a tooth-colored laminate material with layers of different tooth-color shades, with the darker layers preferably arranged toward 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 outer periphery, in which case the annular wall forms a partial region of the cylindrical outer periphery, in which case preferably a holding portion for fixing the circular blank to the CAM device is arranged on the outer surface of the cylindrical outer periphery, in which case it is particularly preferred that the holding portion is a protruding ring surrounding the cylindrical outer periphery.

[0041] This allows the milling body to be fixed to the CAM device in any axial direction, and also allows the milling body to 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 attachable.

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

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

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

[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 for larger or bulkier dental moldings to be produced from the hardened plastic material formed by hardening 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 bonded 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 can be provided that the solid body has at least one stepped annular edge for contact with a ring or tube piece as the annular wall.

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

[0050] The flowable polymerizable plastic may be very viscous, but must be at least paste-like 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 from two different materials, thus completing the device.

[0052] The problem underlying the present invention is further solved by a method for producing a dental mold using the above-mentioned milling body or using such a set, in which the dental mold is produced from at least two different materials which are bonded to one another in the method, the method being characterized by the following chronological steps: A) forming, by subtractive CAM, 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, in accordance with a virtual three-dimensional model of the outer shape of the dental form and the shape of the bonding surfaces of the at least two different materials, while the bonding surface and the negative are in contact with each other and the annular wall of the milling body is maintained; B) filling at least one fluid polymerizable plastic into the hollow chamber of the milling body and into the volume at the bottom of the milling body removed in step A), filling the hollow chamber with the at least one fluid polymerizable plastic to 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, upon hardening of the at least one fluid polymerizable plastic; C) subtractively machining the hardened plastic material from the direction of the upper surface of the milling body by CAM 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 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 carried out from the direction of the upper surface of the milling body and subtractive machining of the bite part of the first material is carried out 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 the 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 regard 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 strong when a dental prosthesis is produced using a milling circular blank. 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 colours of the at least two different materials, but may also alternatively or additionally be realised by various other physical properties, such as wear resistance, hardness, transparency, elastic deformability and / or resilience.

[0058] Subtractive methods are understood to mean material removal methods, such as milling, which are preferred in the present invention and can be carried out particularly preferably by computer-controlled multi-axis mills as CAM devices.

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

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

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

[0062] In the method according to the 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) in 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 enlarges 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 refers to an expansion of the surface of the mold, particularly a uniform expansion of the surface of the dental mold, which increases the volume of the dental mold. This allows the subsequent subtractive processing to be performed on the hardened plastic in the direction of the lower surface of the milling body (particularly in the direction of the occlusion of the dental mold) 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 this method are not negatively affected. For example, the offset can be preferably achieved in the present invention by calculating a predetermined distance vector to supplement the surface of the virtual model of the dental mold, which is oriented in the direction of the lower surface of the milling body and should not consist of the first material. In this case, the distance vector can be directed toward the lower surface of the milling body, thereby translating the surfaces of the virtual model of the dental molding that should not be made of the first material. Alternatively, the distance vector can be arranged perpendicular to the surface of the virtual model of the dental molding, thereby uniformly expanding the surface of the virtual model. Other equivalent or similar means for using distance vectors or other calculation methods to generate offsets can be easily imagined and implemented 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 made from the first material and the prosthesis base is made from a hardened plastic material, in which case the first material is tooth-colored and the hardened plastic material is gum-colored, in which case preferably the first material has a greater hardness and / or wear resistance than the hardened plastic material.

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

[0066] Higher hardness may refer in particular to higher Vickers hardness. Abrasion resistance refers to the resistance to material loss (tooth wear) due to friction (tooth wear). The abrasion resistance of artificial teeth is a dental study of the wear behavior of artificial teeth. The same applies to other materials used in occlusal surfaces. Methods for measuring these are known to those skilled in the art of dentistry, for example, from WO 2016 / 008857 and the references cited therein.

[0067] Furthermore, it may be assumed that in step B), at least one of the at least one flowable polymerizable plastics wets at least the entire surface formed on the first material in step A) during filling.

[0068] This achieves the effect that a stable bond is created 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 from the direction of the underside of the milling body according to the occlusal surfaces of the virtual model of the dental molding.

[0070] It may also be envisaged 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 underside of the milling body, so that the prosthesis base of the partial or complete dental prosthesis consists of the hardened plastic material, at least on the entire visible or occlusal surface, and is therefore gum-colored and does not have any tooth-colored areas that could impair the aesthetic appearance of the partial or complete dental prosthesis.

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

[0073] For other dental moldings, it may also be useful to process the hardened plastic material from the lower surface (occlusal direction) of the milling body and the first material from the upper surface (basal direction) of the milling body.

[0074] Furthermore, it may be envisaged that in step A) at least one marking is attached to the inner surface of the annular wall that 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, in which case preferably the at least one marking is at least one graduation line, and in which 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 purpose.

[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 can optionally 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 if this volume is displayed to the user on a display. This volume can be easily calculated based on a virtual model of the dental molding from the first material minus the part to be produced, possibly with an offset, and from the position of the negative mold in the first material.

[0077] It may be envisaged that before step A) or before step B) and after step A), a ring or tube piece is attached to the solid body, whereby the ring or tube piece forms an annular wall, in which case the ring or tube piece 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, this allows for a particularly simple design of the milling body to be selected. It may be envisaged that the rings or tube pieces are glued to the solid body, with the adhesive being applied to the circumferential and / or full surface of the joining surface, thereby providing a liquid-tight connection between the rings or tube pieces and the solid body. 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 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 so that in step C), the subtractive processing begins 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 in step C) the position and location of the milling body fixed in the CAM device is determined at least once based on at least one marking provided on the milling body and that the position and location of the milling body is taken into account when controlling the CAM device, preferably in that 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 form from the milling body and the hardened plastic material, which is particularly important and beneficial if the milling body is newly installed in the CAM device during step C).

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

[0084] Step A2) is a step of cleaning and / or pretreating the entire 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 by chemical treatment of the surface of the first material during the pretreatment, particularly preferably by chemical expansion of the surface of the first material with 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 further be envisaged that 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 an excess pressure, 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 fluid polymerizable plastic to be expelled, thus avoiding or reducing weak spots or surface damage in the dental molding. For this purpose, for example, a "Paramat Elite" pressure polymerization unit can be used. Furthermore, when packing or using excessive pressure during the filling of at least one fluid polymerizable plastic in step B), boiling bubbles, such as those that occur in MMA-based plastics, can be avoided.

[0088] It may be envisaged that the filling of at least one flowable polymerisable 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 with a pressure of at most 1000 kPa, preferably at most 500 kPa, particularly preferably at most 400 kPa.

[0089] It may further be provided that the filling of the at least one flowable polymerizable plastic in step B) is carried out by padding and / or 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, a high-temperature polymer or a low-temperature polymer is preferably 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 has already been finally hardened.

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

[0093] The surprising finding underlying the present invention is that by using a cavity in the upper surface of a milling body for producing a dental mold, which is filled with a flowable polymerizable plastic as a second material, and by appropriately selecting the position of the occlusal side of the dental mold during the CAD calculation of the corresponding CAM method, the amount of the first material that must be subtractively milled or removed can be reduced. In this case, it is sufficient to position the base surface of the more wear-resistant denture or occlusal part of the dental mold within the bottom region of the cavity. In this way, the formed cavity can be easily filled with a lighter, more easily millable plastic for producing the prosthesis base or base part, and at the same time, the cavity only needs to be filled to the desired height, thereby again resulting in a material saving in the second plastic material. In this case, any material savings automatically translate into time savings and tool conservation, especially when processing wear-resistant materials.

[0094] According to the present invention, particularly with the milling body, set, and method of the present invention, high fitting accuracy of dental molds can be achieved by directly milling the final shape. There is no need for labor when bonding the dentures, and the dental molds are free from unevenness due to the bonding process. At the same time, by fully curing the solid body made of the first material, a particularly wear-resistant material for the dentures can be obtained, and by using a layered first material, a particularly aesthetically appealing denture material can be obtained. In the dental prosthesis, a natural color transition from gum color to tooth color occurs in the correct place, without any compromises. In this case, particularly high aesthetics can be achieved by using a multi-layer milling disk as the tooth-colored solid body.

[0095] The production of the milling bodies according to the invention by the method according to the invention can be carried out in only two stages. That is, a two-stage method can be used to produce dental moldings. Furthermore, blanks or milling bodies with various shapes are not required. However, a small set of milling blanks with different sizes can also be used, or such a small set can be advantageous.

[0096] The hollow space of the milling body allows for reduced milling efforts, resulting in less material removal and tool or mill wear. The user can determine and change the color of the flowable polymerizable plastic itself, for example, by selecting or creating a modified appearance. Internal fill markings, which may already be provided or can be created during the first milling step, allow for a reliable filling process before the second milling step.

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

[0098] 1. The prosthetic work is digitally designed and divided into several data segments. What is required is data on the occlusal or upper oral surface of the dental prosthesis, the lower surface of the base, and 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 on the occlusal or upper oral surface, an additional offset for the gum-colored part may be provided in the CAD.

[0099] 2. Develop a suitable milling strategy for processing the individual process steps: What is needed is a one-sided machining of the bottom surface and a zero point shift that matches the milling body used, as well as a separate zero point shift for double-sided machining, preferably with corresponding, separate zero point shifts for the top and bottom surfaces.

[0100] 3. Fix a milling body or a tooth-colored solid body of the milling body in a milling machine, the size of which corresponds at least to the tooth-colored part, 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 the gum-colored part (of the prosthesis base) slightly offset in the oral direction. The milling body or tooth-colored solid body can preferably be provided with position markings before positioning to allow repositioning.

[0101] 4. When the partially milled blank is removed and the milling body does not already have a cavity defined by an annular wall at its upper surface, a cylindrical ring is optionally placed as the annular wall of the milling body to form a cavity at its upper surface that can be more easily filled with the milled 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 analogous manufacturing process, after which the support ring is optionally removed and the hardened plastic material is optionally subjected to any necessary 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 indication can be attached to the hollow mold during step 3., thereby enabling the user to inspectably ensure sufficient, but not excessively slow, filling of the flowable polymerizable plastic by the user in step 5.

[0106] The method can be completed by polishing and / or surface conditioning of the dental prosthesis by chemical treatment.

[0107] In the following, an embodiment of the invention will be explained on the basis of 11 diagrammatically illustrated figures, without the invention being limited thereto. [Brief explanation of the drawings]

[0108] [Figure 1] 1 is a schematic perspective view showing the top surface of a first milling body according to the present invention; FIG. [Figure 2] 1 is a schematic perspective view showing a side view of a second milling body according to the present invention; FIG. [Figure 3] 1 is a schematic perspective view of the occlusal side of a dental prosthesis manufactured by the method according to the invention using 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 to be manufactured using this milling body. [Figure 5] 5 is a schematic side view of the milling body shown in FIGS. 2 and 4, showing 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] 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. FIG. [Figure 7] 2 and 4 to 6, together with the base portion of the prosthesis base of the dental prosthesis shown in FIG. 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] 9 is 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 mold for the bonding surface 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] 1 is a schematic diagram showing 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. FIG.

[0109] FIG. 1 shows a schematic perspective view of the upper surface (top of FIG. 1) of a first milling body 1 according to the invention. The milling body 1 has a solid body 2 made of a first material. The solid body 2 extends to a lower surface (not visible in FIG. 1) located opposite the upper surface of the milling body 1. The first material may be a fully polymerized tooth-colored plastic that is suitable for the production of dentures and has the necessary wear resistance. The first material is preferably already biocompatible in the milling body 1 so that it is suitable for application in the patient's oral cavity.

[0110] A hollow chamber 4 with a bottom 6 is arranged on the upper surface of the milling body 1, the hollow chamber 4 being laterally bounded 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 of another material. In particular, the annular wall 8 may be a ring or a tube piece that is pushed onto the solid body 2 and firmly connected thereto. The connection may be by adhesive bonding. The solid body 2 may be cylindrical. In order to fit the ring or tube piece as the annular wall 8 onto the outer periphery, the solid body 2 may have a step on its periphery, onto which the ring or tube piece is flush fitted. The annular wall 8 may in particular be a cylindrical tube piece. The annular wall 8 may also be a metal ring.

[0111] Markings 9 for measuring the filling level in the cavity 4 may be arranged on the inner surface of the annular wall 8 facing the cavity 4. However, the markings 9 may also be attached to the annular wall 8, for example, milled in, only during the process for producing the dental molding. Based on 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 element 10 for fixing the milling body 1 in a CAM device may be arranged on at least one outer wall of the milling body 1. The holding element 10 may protrude from the outer wall of the milling body 1 as a fitted torus with a rectangular cross section. As an alternative to the holding element 10 shown in Figure 1, the holding element may also be realized in another way, for example by a protruding projection or by a recess in the side. The holding element 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 present 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 molding to be formed, 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 on the bottom part 6 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 mold using the subtractive CAM device. An offset can be used in this case, so that the negative mold is produced in the solid body 2 slightly deeper, preferably at least a few tenths of a millimeter, than the occlusal or oral surface would require for the hardened plastic material in a direct negative mold based on the CAD model. Additionally, markings 9 can be formed on the annular wall 8 for the first time in this step. The surface newly formed on the bottom part 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 dental mold portion consisting of the hardened plastic material to be completely fabricated from the hardened plastic material on the basal side in accordance with the virtual CAD model. The flowable polymerizable plastic can be hardened under pressure and heat to form the hardened plastic material. The intermediate product can then be placed again in a subtractive CAM device, and the dental mold can be fabricated by the CAM device based on the occlusal or buccal surface and basal surface of the virtual CAD model of the dental mold. In this case, a first portion of the dental mold (e.g., a denture) consists of the first mold material, and a second portion of the dental mold (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, whose occlusal surfaces are made of a first material and whose basal surfaces that contact the patient's teeth are made of a hardened plastic material, which can be used to combine suitable material properties and / or produce aesthetically appealing color gradations.

[0116] 2 shows a schematic perspective view of a second milling body 11 according to the present invention, showing its side. The milling body 11 has a solid body 12 made of a first material. The solid body 12 extends to a lower surface 19 located opposite the upper surface 21 of the milling body 11. The first material may be a fully polymerized, tooth-colored plastic suitable for the production of dentures and having the necessary wear resistance. The first material is preferably biocompatible already in the milling body 1 so that it is suitable for application in the patient's mouth.

[0117] A hollow chamber 14 with a bottom 16 is arranged on the upper surface 21 of the milling body 11, the hollow chamber 14 being laterally bounded 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 of another material. In particular, the annular wall 18 may be a ring or a tube piece that is pushed onto the solid body 12 and firmly connected thereto. The connection may be made by gluing. The solid body 12 may be cylindrical. The annular wall 18 may be a cylindrical tube piece. The annular wall 18 may also be a metal ring.

[0118] Markings (not visible in FIG. 2) for measuring the filling level in the cavity 14 may be arranged on the inner surface of the annular wall 18 facing the cavity 14. However, the markings may also be applied, for example milled, to the annular wall 18 only during the process according to the invention. Based on 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 holding portion 20 for fixing the milling body 11 in a CAM device may be arranged on at least one outer wall of the milling body 11. The holding portion 20 may protrude from the outer wall of the milling body 11. The holding portion 20 may be formed by a protruding annular ring.

[0120] FIG. 3 shows a schematic perspective view of a dental prosthesis 22 manufactured by the method according to the present invention using the milling body 1, 11 according to the present invention. The dental prosthesis 22 has a prosthesis base 24 made of a gum-colored, hardened plastic material. Several dentures 26 can be bonded to the prosthesis base 24 as a single dentition. The dentures 26 are made of a first material, are tooth-colored, and are preferably color-layered to ensure a particularly good aesthetic appearance. The dentures 26 and the prosthesis base 24 are directly bonded to each other when manufactured by the method according to the present 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 previously designed in a known manner based on patient data and, if necessary, further processing, and in order to carry out the method according to the invention, the virtual CAD model is divided by calculation into a tooth-colored portion for the dentures 26 and a gum-colored portion for the prosthesis base 24. 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 of the dental prosthesis 22 opposite the occlusal or oral surface 28 (not visible in FIG. 3 ), 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 following describes, by way of example only, the flow of the method according to the present invention using the milling body 11 shown in FIG. 2 and the virtual CAD model of the dental prosthesis 22 shown in FIG. 3, with reference to FIGS. 4 to 10.

[0122] For this purpose, FIG. 4 shows a schematic side view of the milling body 11 shown in FIG. 2 together with the cross section and position of the dental prosthesis 22 shown in FIG. 3 to be manufactured using the milling body 11. A virtual CAD model of the dental prosthesis 22 is written on or in the milling body 11 at the desired position on the milling body 11. This is useful in that it allows the viewer to visualize how the dental prosthesis 22 to be manufactured will be positioned in the milling body 11 before production, as will be seen in the subsequent drawings. In this case, the artificial tooth 26 is positioned in the milling body 11 so that it is completely contained within the area of ​​the solid body 12 made of the first material. This can be seen somewhat better in the cross section shown in FIG. 5 than in FIG. 4, since the virtual CAD model of the dental prosthesis 22 is shown in FIG. 5 with the artificial tooth 26 cut away. In contrast, the base surface 30 of the virtual CAD model of the dental prosthesis 22 is partially located within 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 in particular 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 denture 26 and the prosthesis base 24 are formed in the solid body 12 of the milling body 11 based on a virtual CAD model using 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 a flowable polymerizable plastic is formed in the bottom 16 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 using the 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. This negative mold 31 is then 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 clearly in the schematic view of the top surface of the milling body 11 thus processed, shown in Figure 9. The bonding surface between the denture 26 and the prosthesis base 24 corresponds in Figure 9 to the surface formed by the area of ​​the solid body 12, which is part of the denture 26 and is already characterized as such in Figure 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 newly formed surface can then be cleaned. Thereafter, the cavity 14 shown in FIG. 9 can be filled or blocked with a flowable polymerizable plastic up to the markings. The flowable polymerizable plastic can then be cured (preferably for 30-60 minutes) (preferably under pressure and / or at an elevated temperature compared to room temperature) to form a cured plastic material 32 (see FIG. 10) from which the prosthesis base 24 is manufactured.

[0125] After hardening, the resulting intermediate product is again clamped in a subtractive CAM machine (multi-axis mill), and the occlusal or oral surface 28 of the dental prosthesis 22 (now without offset) and the base surface 30 of the dental prosthesis 22 are subtractively produced from the intermediate product in accordance with a virtual CAD model of the dental prosthesis 22. For this purpose, FIG. 10 shows a schematic representation of the base side 30 of the dental prosthesis 22 after subtractive fabrication from the polymerized and hardened plastic material 32, after processing 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, the dental prosthesis 22 may be cleaned, polished, and / or surface-treated 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 moulds, 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) comprising an upper surface (21) of the milling body (1, 11) having a hollow chamber (4, 14) for containing a flowable polymerizable plastic, the hollow chamber (4, 14) having a bottom (6, 16) and being bounded laterally from the edge of the bottom (6, 16) by an annular wall (8, 18) which is ring-shaped and has a height of at least 5 mm, the first material forming the bottom (6, 16), and the solid body (2, 12) extending to a lower surface (19) of the milling body (1, 11) arranged opposite the upper surface (21) of the milling body (1, 11).

2. The annular wall (8, 18) has a wall thickness of up to 20 mm.

2. A milling body (1, 11) according to claim 1.

3. The height of the annular wall (8, 18) is at least 15 mm.

2. A milling body (1, 11) according to claim 1.

4. markings (9) for measuring the filling level in the cavity (4, 14) are arranged on at least one inner surface of the annular wall (8, 18) that defines the cavity (4, 14); Milling body (1, 11) according to claim 1 or 2.

5. The marking (9) has a scale with equally spaced graduation lines and / or numerical values ​​or a vertical scale for measuring the filling height or volume of the flowable polymerizable plastic in the hollow chamber (4, 14). Milling body (1, 11) according to claim 4.

6. the bottom (6, 16) of the cavity (4, 14) is flat and / or the annular wall (8, 18) has a cylindrical surface relative to the interior of the cavity (4, 14), Milling body (1, 11) according to claim 1 or 2.

7. the annular wall (8, 18) of the milling body (1, 11) is formed by a tube or a ring fixed to the solid body (2, 12), the milling body (1, 11) consisting of the first material and the tube or ring, or the annular wall (8, 18) of the milling body (1, 11) is made of the first material, and the solid body (2, 12) and the annular wall (8, 18) are integrally formed, whereby the milling body (1, 11) is made of the first material; Milling body (1, 11) according to claim 1 or 2.

8. the first material is a first plastic material, the first plastic material being final cured; Milling body (1, 11) according to claim 1 or 2.

9. The first material is a laminated first plastic material having multiple layers of different color tones. Milling body (1, 11) according to claim 1 or 2.

10. The layer planes of the layers are arranged parallel to the bottom (6, 16) of the hollow chamber (4, 14) or perpendicular to the annular wall (8, 18) or parallel to a plane arranged parallel to the base surface of the cylindrical inner wall of the annular wall (8, 18). Milling body (1, 11) according to claim 9.

11. the milling body (1, 11) is a circular blank with a cylindrical periphery, the annular wall (8, 18) forming a partial area of ​​the cylindrical periphery; Milling body (1, 11) according to claim 1 or 2.

12. The milling body (1, 11) has a holding portion (10, 20) arranged on the outer surface of the cylindrical outer periphery for fixing the circular blank to a CAM device. Milling body (1, 11) according to claim 11.

13. the milling body (1, 11) has at least one position marking visible from the outside on the outer surface of the cavity (4, 14), which position marking allows for the determination of the position and orientation of the milling body (1, 11) in a CAM device, the at least one position marking being 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); Milling body (1, 11) according to claim 1 or 2.

14. The milling body (1, 11) is provided with at least two position markings that are visible from both the upper surface (21) and the lower surface (19). Milling body (1, 11) according to claim 13.

15. the volume of the material of the annular wall (8, 18) is at most half the volume of the hollow chamber (4, 14); Milling body (1, 11) according to claim 1 or 2.

16. The solid body (2, 12) has an annular step portion, and the annular wall (8, 18) is fitted onto the step portion, so that the inner surface of the annular wall (8, 18) is in flush contact with the solid body (2, 12). Milling body (1, 11) according to claim 1 or 2.

17. The annular wall (8, 18) is bonded to the solid body (2, 12) in the circumferential direction over its entire surface. Milling body (1, 11) according to claim 16.

18. 10. A set for producing dental moldings, comprising the milling body (1, 11) according to claim 1 and at least one flowable polymerizable plastic and / or starting components for producing at least one flowable polymerizable plastic, the set additionally comprising at least one device for filling the at least one flowable polymerizable plastic and / or for producing and mixing the at least one flowable polymerizable plastic.

19. A method for producing dental molded bodies using a milling body (1, 11) for producing dental molded bodies, comprising: The milling body (1, 11) has a solid body (2, 12) made of a first material, which is biocompatible. In the milling body (1, 11), a hollow chamber (4, 14) for containing a flowable polymerizable plastic is arranged on the upper surface (21) of the milling body (1, 11), the hollow chamber (4, 14) having a bottom (6, 16) and the hollow the chamber (4, 14) is defined laterally from the edge of the bottom (6, 16) 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) located opposite the upper surface (21) of the milling body (1, 11), or A method for producing a dental molded body using a set for producing a dental molded body, comprising: A milling body (1, 11) has a solid body (2, 12) made of a first material, which is biocompatible, and on the upper surface (21) of the milling body (1, 11) there is arranged a hollow chamber (4, 14) for containing a flowable polymerizable plastic, the hollow chamber (4, 14) having a bottom (6, 16) and being bounded laterally by an annular wall (8, 18) starting from the edge of the bottom (6, 16), the annular wall (8, 18) being ring-shaped, and the first material is contained in the bottom (6, 16). , 16), the solid body (2, 12) extending to a lower surface (19) of the milling body (1, 11) arranged opposite the upper surface (21) of the milling body (1, 11), and at least one flowable polymerizable plastic and / or starting components for producing at least one flowable polymerizable plastic, in which the dental mold is produced from at least two different materials which are bonded to each other in the process, The method comprises the following chronological steps: A) according to a virtual three-dimensional model of the contour of the dental mould and the shape of the bonding surfaces of the at least two different materials, by means of subtractive CAM methods, 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 chamber (4, 14) of the milling body (1, 11) and into the volume at the bottom (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 chamber (4, 14) to a predetermined filling level, so that the annular wall (8, 18) is filled with at least one fluid polymerizable plastic. and hardening the at least one fluid polymerizable plastic in the cavities (4, 14) and in the recesses, resulting in a hardened plastic material in the cavities (4, 14) of the milling body (1, 11) that is firmly and flushly bonded to the first material of the milling body (1, 11) upon hardening of the at least one fluid polymerizable plastic. C) subtractively machining the hardened plastic material from 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 mould, and subtractively machining the first material from 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 mould, thereby subtractively producing the dental mould from the hardened plastic material and the first material bonded to the hardened plastic material. A method characterized by:

20. forming the negative (31) of a partial area of ​​the surface of the dental molding, which is produced in step A) on the bottom (6, 16) of the cavity (4, 14) of the milling body (1, 11) and on the first material of the milling body (1, 11), with an offset, which increases the volume of the virtual model of the dental molding in areas where the dental molding should not consist of the first material; 20. The method of claim 19.

21. the dental molding is a night guard and the first material has a greater hardness than the hardened plastic material; or The dental molding 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 denture tooth (26), the at least one denture 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-colored and the hardened plastic material being gum-colored.

20. The method of claim 19.

22. The first material has greater hardness and / or wear resistance than the hardened plastic material.

20. The method of claim 19.

23. In step B), at least one of the at least one flowable polymerizable plastics wets at least the entire surface formed on the first material in step A) during filling.

20. The method of claim 19.

24. In step C), subtractive machining of the first material and the hardened plastic material is carried out by the CAM method from the direction of the lower surface (19) of the milling body (1, 11) according to the occlusal surface of the virtual model of the dental mould; and / or 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 top surface (21) of the milling body (1, 11) according to the base surface of the virtual model of the dental mould.

20. The method of claim 19.

25. In step A), at least one marking (9) is attached to the inner surface of the annular wall (8, 18) that defines the cavity (4, 14) of the milling body (1, 11), and the at least one marking (9) is formed on the inner surface of the annular wall (8, 18) by the subtractive CAM method, and the distance of the 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 molding, 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), 20. The method of claim 19.

26. before step A), or before step B) and after step A), attaching a ring or a tube piece to the solid body (2, 12), whereby the ring or the tube piece forms the annular wall (8, 18); 20. The method of claim 19.

27. before step C), calculating a zero point shift to determine the plane of the surface of the hardened plastic material formed in step B), and taking into account the zero point shift in step C) so that the subtractive processing begins in the plane of the surface of the hardened plastic material; 20. The method of claim 19.

28. at least once in step C), the position and location of the milling body (1, 11) fixed in the CAM device are determined based on at least one marking provided on the milling body (1, 11), and the position and location of the milling body (1, 11) are taken into account when controlling the CAM device; 20. The method of claim 19.

29. After step A) and before step B), step A2) is performed, Step A2) is a step of cleaning and / or pretreating the entire 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 mold (31), or the bonding surface and the negative mold (31), during which chemical treatment of the surface of the first material and chemical expansion of the surface of the first material with a monomer liquid are carried out, the first material being a plastic composition containing or consisting of polymethyl methacrylate (PMMA); 20. The method of claim 19.

30. The filling of the at least one flowable polymerizable plastic in step B) is carried out by stuffing and / or under excess pressure, 20. The method of claim 19.

31. The filling of the at least one flowable polymerizable plastic in step B) is carried out by stuffing and / or under excess pressure, 20. The method of claim 19.

32. the hardening of the flowable polymerizable plastic in step B) is carried out by the action of heat and / or pressure, and the hardening is carried out for a time period between 10 minutes and 120 minutes; 20. The method of claim 19.

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