MILLING BLANK AND METHOD FOR PRODUCING A DENTAL MOLDED BODY

Description

[0001] The invention relates to a milling blank for producing a dental component, in the form of a partial or complete dental prosthesis or an occlusal splint, and to a method for producing a dental component using such a milling blank. The milling blank is designed and suitable for subtractive machining, and the dental component produced therefrom must be suitable for use in the dental field and insertable into a patient's oral cavity.

[0002] Alongside traditional craftsmanship, digital manufacturing methods are gaining increasing importance in the dental field. For several years now, dental prostheses and other dental components, such as dentures, crowns, bridges, and bite splints, have been manufactured subtractively using CAD / CAM technologies in milling processes (CAM - Computer-Aided Manufacturing, CAD - Computer-Aided Design). CAD / CAM methods are also increasingly being used in the fabrication and design of partial and complete dentures with a denture base for resting on the gingiva and with attached or positioned denture teeth.

[0003] In the digital design of prosthetic work, especially partial or complete dentures, the construction is divided into a "white" or tooth-colored tooth component (the denture teeth) and a gum-colored ("pink") denture base component (the denture base). Dental prostheses therefore consist of a gum-colored or pink base and tooth-colored components (denture teeth or tooth segments).

[0004] There are methods, such as those known from DE 10 2009 056 752 A1 or WO 2013 / 124 452 A1, in which a partial or complete dental prosthesis is digitally set up and produced using CAD / CAM processes. Patent DE 103 04 757 B4 discloses a method for manufacturing dental prostheses in which the teeth are virtually set up in a virtual model and a prosthesis base is manufactured based on this virtual model. EP 2 742 906 A1 discloses a method in which a dental arch is connected to an impression material, the impression material being contained in a customized impression tray and containing an impression of the patient's oral cavity. The surface of the tray with the dental arch is digitized, and then a virtual model of the dental arch is computationally positioned and oriented as closely as possible within the virtual model of the prosthesis base.

[0005] In the context of digital total or partial dentures, denture teeth or tooth shapes are needed that can be bonded to the denture base in a clear and reproducible manner.

[0006] WO 2016 / 091 762 A1 discloses a method for manufacturing a dental prosthesis in which a template is produced with which several prosthesis teeth can be attached to a denture base in the desired position and orientation relative to each other. The prosthesis teeth are shortened by basal grinding in a cervical area to achieve the desired occlusal height. WO 2016 / 110 392 A1 discloses a method for manufacturing a dental prosthesis in which a plastically deformable connecting element is inserted into tooth sockets of a denture base to allow manual correction of the alignment of the prosthesis teeth in the denture base. DE 10 2008 019 694 B3 discloses a method and a device for manufacturing dental components from ceramics using a laser.From EP 2 571 451 B1 and EP 2 666 438 A2, methods for manufacturing dental prostheses are known in which prefabricated denture teeth are embedded in wax in a holder and then milled cervically using CAM technology. It is necessary to shorten the denture teeth basally (or cervically) to adapt the tooth height to the patient's jaw, i.e., to adjust the bite height of the denture to the patient's needs. WO 2014 / 159 436 A1 discloses a layered dental prosthesis with a reinforcement in the denture base, which is cast into a basal cavity. Besides dentures, other dental components such as occlusal splints can also be digitally manufactured using subtractive CAM processes based on patient data. A disadvantage of such occlusal splints is that they must have sufficient abrasion resistance, which reduces wearing comfort on the teeth.Furthermore, the possibility of aesthetically modifying bite splints is limited.

[0007] In both additive and subtractive manufacturing, the bonding of the base and tooth-colored components (denture teeth) presents a significant challenge. This bonding is typically achieved through adhesive bonding, but the quality of the transitions is prone to errors due to the use of too little or too much adhesive, as well as the correct positioning of the denture teeth during bonding. While available one-piece, two-color (gum-colored and tooth-colored) milling blanks offer excellent layer bonding, the aesthetics are always a compromise and therefore unsatisfactory due to the predetermined phase boundaries.

[0008] US 2013 / 0101962 A1 discloses a method for manufacturing a dental prosthesis, in which several recesses are milled into a block along a dental arch. These recesses are filled with various types of resin, and the prosthetic teeth are fabricated from the resin that has hardened in the recesses. The block is then largely removed, and the prosthesis base is fabricated from the remaining material. This is a multi-stage milling process. Disadvantages of the method according to US 2013 / 0101962 A1 include significant material loss, the time required to remove material from the block, and the wear and tear on the tools used.From EP 2 915 503 B1, a reverse process for manufacturing a dental prosthesis is known, in which a milling blank made of enamel material is subtractively machined to create a cavity that serves as a negative mold for the base of the dental prosthesis. Subsequently, the occlusal and basal surfaces of the dental prosthesis are subtractively manufactured from this composite. This is also a multi-stage milling process. A disadvantage of the process according to EP 2 915 503 B1 is that very large quantities of the relatively hard enamel material must be removed to manufacture the dental prostheses. This not only results in the loss of a significant amount of enamel material, but also places intensive demands on the milling tools, and the time required to implement the process is relatively long.Furthermore, if the enamel material is not completely removed from the outer surfaces (occlusal and oral sides) of the denture base, aesthetically displeasing white or tooth-colored remnants may remain, which then have to be manually removed by the dental technician. This, in turn, can lead to an unintended thinning of the denture base material.

[0009] CA 3 009 011 A1 discloses a method for manufacturing a dental prosthesis in which the tooth-shaped structures are first formed from a milling body. The milling body is then fixed in a mold, and the material for the prosthesis base is injected and polymerized in the mold. The mold is then removed, and the prosthesis base is machined from the polymerized material. EP 3 597 144 A1 discloses a method for manufacturing a dental prosthesis from a blank made of two materials, wherein the materials have a wave-like interface along a dental arch. EP 3 701 902 A1 and US 2014 / 0272800 A1 disclose methods for manufacturing ceramic crowns. EP 3 375 407 A1 discloses a milling blank for manufacturing a crown.

[0010] The following possibilities exist in the state of the art for the production of digitally designed total dentures: 1. Milling or printing the gum-colored base and bonding it to artificial teeth, or alternatively to milled or printed tooth-colored segments. Disadvantages include: manufacturing inaccuracies, time expenditure, aesthetic challenges due to excess adhesive or underfilling of marginal gaps, and limitations regarding the milling of cavities due to undercuts. 2. Milling prefabricated milling discs with an integrated two-phase structure. The aim here is to achieve a natural aesthetic through the skillful arrangement of the transitions. A disadvantage is the position of the transitions from gum-colored to tooth-colored, which always represents a compromise and is aesthetically unsatisfactory. 3. Milling pre-formed bodies into which prefabricated teeth are already integrated. With these methods, primarily only the basal side of the prosthesis is individually fabricated.The disadvantage of this method is that compatibility with individual patient cases is extremely limited, and many variations of pre-formed components must be kept in stock. 4. Layered construction of a prosthesis consisting of tooth-colored individual layers and a denture base by repeatedly milling and refilling the milled cavities. The disadvantages of this method are the significant material waste and the time required.

[0011] The object of the invention is to overcome the disadvantages of the prior art. In particular, it aims to provide a method and a milling cutter for producing a dental component from two different materials that are firmly bonded together, enabling the rapid and resource-efficient production of dental components using subtractive CAM processes. The bonding of the materials should occur without the use of an adhesive. Specifically, the two materials should be able to be joined directly to one another within the process. For this purpose, the milling cutter should already possess suitable features to facilitate the implementation of the process as easily and efficiently as possible. The process should be as simple and straightforward as possible for the dental technician to implement, and the milling cutter should possess features suitable for carrying out the process.In particular, fully automated or as automated as possible techniques such as CAD / CAM technologies should be used and available.

[0012] The objects of the invention are solved by a milling body according to claim 1, a set according to claim 8, a method according to claim 9 and a dental molded body according to claim 16. Preferably variants are claimed by dependent claims 2 to 7, and 10 to 15.

[0013] The objects of the invention are thus solved by a milling body for producing a dental molded part, wherein the milling body comprises a solid body made of a first material, wherein the first material is biocompatible, wherein a cavity for receiving a fluid polymerizable plastic is arranged on a top side of the milling body, wherein the cavity has a bottom and the cavity is laterally bounded from the edge of the bottom by a circumferential wall, wherein the circumferential wall is annular, and wherein the solid body forms the bottom and the solid body extends to a bottom side of the milling body which is arranged opposite the top side of the milling body, wherein the dental molded part to be produced is an occlusal splint, wherein the first material has a greater hardness than the cured plastic material, or the dental molded part to be produced is a dental prosthesis.the dental prosthesis consists of a gum-colored or pink base and tooth-colored components.

[0014] Theoretically, it is also possible to have a second material applied to the underside of the milling body, either partially or completely, which then formally forms the outer underside of the milling body. In particular, the wall can extend to the underside of the milling body and even project slightly beyond it. However, according to the invention, it is preferred that at least a portion of the underside of the milling body, or more preferably the entire surface, is formed by the first material and is not covered by another material, because this simplifies the use of the milling body and makes the construction more cost-effective.

[0015] It is theoretically possible to realize the circumferential wall using a separate ring or tube section, which is attached to the solid body shortly before application or during a manufacturing process and is thereby firmly connected to the solid body, or otherwise firmly connected to the solid body. Such an embodiment is therefore to be regarded as in accordance with the invention or at least as equivalent.

[0016] It may be provided that the first material is a plastic or a plastic composition, preferably a polymethyl methacrylate (PMMA) or a PMMA-containing plastic composition and / or a hot polymer.

[0017] An annular wall according to the present invention has a recess that encloses the geometric center of the recess. Preferably, the recess is formed without undercuts and / or every point in the recess can be connected in a straight line to every other point in the recess, without the straight line running within the surrounding wall. Preferably, the recess is a compact geometric body.

[0018] The cavity preferably has no surfaces directly defined by the outer surface of the dental component to be produced before processing with a method for manufacturing the dental component. In particular, it has no tooth contours, dental arches, and / or denture base contours. Only the dimensions can and preferably are adapted to typical or maximum sizes of dental components.

[0019] A milling body within the meaning of the present invention is understood to be a solid body suitable for subtractive machining with milling tools and whose geometric dimensions are suitable for handling in CAM milling machines.

[0020] In milling bodies according to the invention, the circumferential wall can have a wall thickness of a maximum of 20 mm, preferably a maximum of 10 mm, and particularly preferably a maximum of 5 mm. It can also be provided that the circumferential wall is at least 5 mm high, preferably at least 15 mm high.

[0021] The height of the surrounding wall refers to the distance of the upper edge of the surrounding wall from the level of the floor of the cavity.

[0022] Preferably, the surrounding wall has a uniform wall thickness and / or a uniform height.

[0023] This makes the milling body, in terms of its dimensions, well suited for use as a semi-finished product for the production of dental molded parts.

[0024] It is also possible for the milling body to have external dimensions between 50 mm and 150 mm, in particular a diameter between 50 mm and 150 mm. Such dimensions are practical and sufficient for dental components.

[0025] Furthermore, it can be provided that a marking for determining a fill level in the cavity is arranged on at least one inner surface of the circumferential wall bounding the cavity, wherein preferably the marking has a scale with equidistant calibration marks and / or numbers, particularly preferably a length scale for determining a fill height or a volume of the fluid polymerizable plastic in the cavity.

[0026] This allows the user to precisely fill the cavity with the desired amount of fluid polymerizable plastic. This prevents material waste and simultaneously reduces the time required for subsequent subtractive machining of the milling body, thus potentially also protecting the milling tools.

[0027] Notches can also be arranged on the inside of the circumferential wall as a marker, or they can be incorporated during a process according to the invention. These notches can be used to determine the fill level into which the fluid polymerizable plastic can be poured. A rod or ruler of suitable length can also be inserted into the notches as an extension beyond the circumference. The ruler can facilitate repositioning of the milling body in the CAM device.

[0028] Furthermore, it can be provided that the bottom of the cavity is flat and / or that the surrounding wall has a cylindrical surface towards the interior of the cavity, preferably being tubular.

[0029] This provides a milling body that is particularly easy and cost-effective to manufacture.

[0030] It can also be provided that the circumferential wall of the milling body is formed by a tube section or a ring body which is fixed to the solid body, wherein preferably the milling body consists of the first material and the tube section or the ring body, or the circumferential wall of the milling body consists of the first material, wherein preferably the solid body and the circumferential wall are made in one piece, so that the milling body consists of the first material.

[0031] Both measures allow for simple and cost-effective production of the milling body.

[0032] Preferably, the pipe section or ring body is connected to the solid body in a liquid-tight manner. It is also possible for the pipe section or ring body to be bonded to the solid body over its entire surface and / or all around.

[0033] It is also preferable that the first material is a first plastic material, wherein the first plastic material is preferably end-cured.

[0034] Plastic materials can be produced cost-effectively. By using a fully cured first plastic material, deformation after milling can be prevented by post-curing of the first plastic material.

[0035] Furthermore, it can be provided that the first material is a layered first plastic material with several layers of different colors, wherein layer planes of the layers are preferably arranged parallel to the bottom of the cavity or parallel to a plane that is perpendicular to the circumferential wall, in particular parallel to a base surface of a cylindrical inner wall of the circumferential wall.

[0036] This measure allows for the fabrication of an aesthetically pleasing dental component from the first material. This is particularly important when prosthetic teeth are fabricated from the first material. Therefore, according to the invention, the first material is preferably a tooth-colored layered material with layers of different tooth-colored shades, wherein darker layers are preferably arranged towards the cavity. Preferably, the first material is a multilayer material consisting of differently colored tooth-colored layers.

[0037] Furthermore, it can be provided that the milling body is a disc with a cylindrical outer circumference, wherein the circumferential wall forms a partial area of ​​the cylindrical outer circumference, wherein preferably a holder for fixing the disc to a CAM device is arranged on the outside of the cylindrical outer circumference, wherein the holder is particularly preferably a projecting ring circumferential around the cylindrical outer circumference.

[0038] This allows the milling cutter to be fixed in any axial orientation within a CAM fixture. Furthermore, the milling cutter can also be repositioned in this way.

[0039] It may also be provided that the solid body additionally has a step in the cylindrical outer circumference, onto which the circumferential wall is placed and to which the circumferential wall is attached or can be attached.

[0040] In a preferred embodiment, the milling body may have at least one position marking on a surface outside the cavity, which is visible from the outside and allows the position and orientation of the milling body to be determined in the CAM device, wherein the at least one position marking is preferably arranged in the area of ​​at least one edge of the milling body, which is visible from the top and / or bottom of the milling body, wherein at least two position markings are particularly preferably provided, which are visible from both the top and the bottom of the milling body.

[0041] This allows the position and orientation of the milling body in the CAM device to be measured and checked using a camera or another sensor (e.g., magnetic).

[0042] It can also be provided that the volume of the material of the surrounding wall is at most half the volume of the cavity, preferably the volume of the material of the surrounding wall is at most one third the volume of the cavity, and particularly preferably the volume of the material of the surrounding wall is at most one fifth the volume of the cavity.

[0043] This results in greater material savings. Furthermore, it allows for a larger volume of fluid polymerizable resin to be used. This enables a larger or more voluminous portion of the dental restoration to be manufactured from the cured resin material formed by the curing of the fluid polymerizable resin.

[0044] Furthermore, it can be provided that the solid body has a circumferential step onto which the circumferential wall is attached, so that the circumferential wall lies flush with the solid body on an inner side, preferably the circumferential wall being glued to the solid body over its entire surface and all around.

[0045] This simplifies manufacturing and allows the surrounding wall to be reused. Preferably, for this purpose, the solid body can also be provided with at least one stepped circumferential edge for attaching a ring body or a pipe section as a circumferential wall.

[0046] The problems underlying the present invention are also solved by a set for producing a dental molded body comprising a milling body according to the invention as described above and at least one fluid polymerizable plastic and / or starting components for producing at least one fluid polymerizable plastic, wherein preferably the set additionally comprises at least one device for filling the at least one fluid polymerizable plastic and / or for producing and mixing the at least one fluid polymerizable plastic, wherein the dental molded body to be produced is an occlusal splint, wherein the first material has a greater hardness than the cured plastic material, or the dental molded body to be produced is a dental prosthesis, wherein the dental prosthesis consists of a gum-colored or pink-colored base and tooth-colored components.

[0047] The fluid polymerizable plastic can also be very viscous, but then it must at least be pasty and moldable at room temperature or at the application temperature; however, a low viscosity is preferred. A low-viscosity plastic has a viscosity similar to that of water or rapeseed oil at room temperature.

[0048] The set allows the complete manufacturing of the dental formwork from two different materials, thus completing the device.

[0049] The problems underlying the present invention are further solved by a method for producing a dental shaped part using a milling body described above, or using such a set, or using a milling body for producing a dental shaped part, wherein the milling body comprises a solid body made of a first material, the first material being biocompatible, wherein a cavity for receiving a fluid polymerizable plastic is arranged on a top side of the milling body, the cavity having a bottom and the cavity being laterally bounded from the edge of the bottom by a circumferential wall, the circumferential wall being annular, and wherein the solid body forms the bottom and the solid body extends to a bottom side of the milling body which is arranged opposite the top side of the milling body.wherein in the process the dental formwork is manufactured from at least two different materials which are joined together in the process, wherein the process is characterized by the following chronological steps: , A) Producing a bonding surface, wherein the bonding surface defines the area between the first material and the cured plastic material to be produced from the fluid polymerizable plastic in the dental mold to be produced, and producing a negative mold of a partial area of ​​the surface of the dental mold to be produced in the bottom of the cavity of the milling body and thus in the first material of the milling body using a subtractive CAM process according to a virtual three-dimensional model of an outer shape of the dental mold and a virtual shape of the bonding surface of the at least two different materials, wherein the bonding surface and the negative mold are adjacent to each other and wherein the circumferential wall of the milling body is preserved;B) Filling at least one fluid polymerizable plastic into the cavity of the milling body and into the volume removed in step A) in the base of the milling body, wherein the at least one fluid polymerizable plastic is filled into the cavity to such a fill level that the circumferential wall comes into contact with at least one fluid polymerizable plastic of the at least one fluid polymerizable plastic that was last filled in or applied externally, and curing the at least one fluid polymerizable plastic in the cavity and in the volume removed in step A) in the base of the milling body, wherein, during the curing of the at least one fluid polymerizable plastic, a cured plastic material is formed in the cavity of the milling body, which is firmly and flushly bonded to the first material of the milling body;C) Subtractive machining of the cured plastic material from the top side of the milling body using a CAM process according to a basal surface of the virtual model of the dental form, and subtractive machining of the first material from the bottom side of the milling body using a CAM process according to an occlusal surface of the virtual model of the dental form, so that the dental form is subtractively machined from the cured plastic material and the associated first material.

[0050] According to the invention, it can be provided that in step C) a basal subtractive machining of the hardened plastic material is carried out from the direction of the top of the milling body and an occlusal subtractive machining of the first material is carried out from the direction of the bottom of the milling body.

[0051] According to the invention, the first material preferably exhibits a greater abrasion resistance than the cured plastic material produced by polymerization of the fluid polymerizable plastic.

[0052] A dental prosthesis is a device used in dentistry or dental care whose external shape corresponds to anatomically specific surfaces in a patient's oral cavity. Examples include dentures, partial dentures, complete dentures (including those with individual teeth or tooth fragments), occlusal splints, orthodontic appliances, and components of such prostheses.

[0053] Preferably, according to the invention, the dental component to be produced from the milling cutter is a dental prosthesis. The milling cutters are particularly well suited for the production of dental prostheses, or rather, the advantages of the present invention are particularly pronounced when a dental prosthesis is produced with the milling cutter. The same applies to the method according to the invention, which is also particularly well suited for the production of dental prostheses.

[0054] The difference between the at least two different materials can lie in a different coloring of the at least two different materials, but can also alternatively or additionally be realized through other different physical properties, such as abrasion resistance, hardness, transparency, elastic deformability and / or elasticity.

[0055] A subtractive process is understood to be a material removal process, such as, and preferably according to the invention, a milling process. Such a milling process can particularly preferably be carried out with a computer-controlled multi-axis milling machine as a CAM device.

[0056] The cured plastic material is preferably biocompatible, at least on the surface of the dental mold.

[0057] It may be provided that the milling body is attached to the CAM device before step C) and preferably after step B), in particular via a holder of the milling body.

[0058] Curing can be achieved by using a press to apply pressure to the fluid polymerizable plastic.

[0059] In the methods according to the invention, it can be provided that the negative shape of the partial area of ​​the surface of the dental mold body, 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 generated with an offset, wherein the offset increases the volume of the virtual model of the dental mold body in an area where the dental mold body is not to consist of the first material.

[0060] An offset for the negative form of the surface area of ​​the dental mold is understood to mean an expansion of the mold's surface, particularly a uniform expansion, towards a larger volume of the dental mold. This ensures that the subsequent subtractive machining from the underside of the milling cutter (especially the occlusal direction of the dental mold) can be carried out according to the virtual model without the offset in the cured resin. This guarantees that after subtractive machining from the underside of the milling cutter, no residue of the initial material remains on the surface of the dental mold, thus preventing any negative impact on the aesthetic appearance and / or physical properties of the dental mold produced by this method.The offset can be achieved, for example, and preferably according to the invention, by computationally adding a distance vector to the surfaces of the virtual model of the dental mold that are oriented towards the underside of the milling body and are not to be made of the first material. The distance vector can be oriented towards the underside of the milling body, resulting in a parallel displacement of the surfaces of the virtual model of the dental mold that are not to be made of the first material. Alternatively, the distance vector can also be arranged perpendicular to the surface of the virtual model of the dental mold, so that the relevant surfaces of the virtual model are extended uniformly.Other equivalent or similar possibilities for using a distance vector or other calculation methods to generate the offset are readily conceivable and feasible for a person skilled in the art.

[0061] Furthermore, it can be provided that the dental formwork is an occlusal splint, wherein the first material has a greater hardness than the cured plastic material, or that the dental formwork is a dental prosthesis in the form of a partial or complete denture, wherein the dental prosthesis has a denture base and at least one denture tooth, and wherein the at least one denture tooth is made of the first material and the denture base is made of the cured plastic material, wherein the first material is tooth-colored and the cured plastic material is gum-colored, wherein preferably the first material has a greater hardness and / or abrasion resistance than the cured plastic material.

[0062] This ensures that the occlusal surfaces, which are subject to particularly high stress during the use of the dental formwork, or the prosthetic teeth, have a greater hardness and / or abrasion resistance than the basal surfaces of the dental formwork that come into contact with the teeth and / or the oral mucosa, or that the prosthetic base supporting the prosthetic teeth has other physical properties suitable for the respective purpose.

[0063] A higher Vickers hardness can be specified as a greater hardness. Abrasion resistance characterizes the resistance to material loss (tooth wear) due to frictional action (tooth abrasion). The abrasion resistance of artificial teeth is a dental test to determine their wear behavior. The same applies to other materials used on the occlusal surfaces. Methods for determining these values ​​are known to those skilled in dental technology, for example, from WO 2016 / 008857 A1 and the sources cited therein.

[0064] Furthermore, it may be provided that in step B) at least one of the at least one fluid polymerizable plastics fully wets at least the surfaces created in step A) in the first material during filling.

[0065] This ensures that a stable bond is created between the first material and the cured plastic material.

[0066] It may also preferably be provided that in step C) subtractive machining of the first material and the hardened plastic material is carried out from the direction of the underside of the milling body using the CAM method according to the occlusal surface of the virtual model of the dental mold body.

[0067] It may also be provided that in step C) subtractive machining of the hardened plastic material and the first material from the direction of the top of the milling body is carried out using the CAM method according to the basal surface of the virtual model of the dental mold body.

[0068] Particularly when manufacturing a partial or complete dental prosthesis, it is advisable in step C) to not only perform the occlusal subtractive machining of the first material, but also to occlusally machine the hardened plastic material from the underside of the milling body using the CAM method, so that the prosthesis base of the partial or complete dental prosthesis consists of the hardened plastic material at least on the visible surfaces or the entire occlusal upper surfaces and is therefore gum-colored and has no tooth-colored areas that could disturb the aesthetic appearance of the partial or complete dental prosthesis.

[0069] The tooth-colored first material can theoretically also be visible on the contact surface on the edentulous jaw or on the oral mucosa.

[0070] For other dental molded parts, it may also be useful to process the hardened plastic material from the underside of the milling body (the occlusal direction) and the first material from the top of the milling body (the basal direction).

[0071] Furthermore, it can be provided that in step A) at least one marking is applied to the inside of the circumferential wall bounding the cavity of the milling body, in particular the at least one marking is generated on the inside of the circumferential wall by the subtractive CAM method, wherein the distance of the at least one marking from the bottom of the cavity is determined according to the virtual model of the dental mold body, wherein preferably the at least one marking is at least one calibration mark, wherein in step B) the at least one fluid polymerizable plastic is filled into the cavity up to the height of the at least one marking.

[0072] This allows material of at least one fluid plastic to be saved, less waste is produced, and the subsequent subtractive machining of the hardened plastic material from the top of the milling body can be carried out faster, thus protecting the tools used in the CAM device.

[0073] It may be provided that at least one marking is created in the area of ​​at least one existing marking, such as a scale, on the inside of the surrounding wall. Using this marking or scale, the user can then estimate the 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. This volume can be easily calculated from the virtual model of the dental mold, subtracting the part to be produced from the first material, possibly adding the offset, and from the position of the negative mold within the first material.

[0074] It may be provided that before step A) or before step B) and after step A) a ring body or a tube section is attached to the solid body, so that the ring body or the tube section forms the circumferential wall, preferably the ring body or the tube section being removed again after step B) and before step C).

[0075] This allows the use of a suitable ring body or pipe section for the subsequent process. Furthermore, this enables a particularly simple design for the milling body. The ring body or pipe section can be glued to the solid body, with the adhesive applied circumferentially and / or across the entire surface of the joint, creating a liquid-tight bond between the ring body or pipe section and the solid body. This prevents the fluid polymerizable plastic from flowing out of the cavity in step B).

[0076] Furthermore, it may be provided that before step C) a zero point shift is calculated to define the plane of the surface of the cured plastic material generated in step B), whereby in step C) the zero point shift is taken into account in such a way that the subtractive machining begins in the plane of the surface of the cured plastic material.

[0077] This allows the process to be shortened, since the tool for performing the subtractive machining is not guided in empty space, but begins in the areas - or at least in their immediate vicinity - where the hardened plastic material is present.

[0078] Furthermore, it can be provided that in step C) the position and orientation of the milling body attached in the CAM device is determined at least once by means of at least one marking on the milling body and the position and orientation of the milling body is taken into account when controlling the CAM device, wherein preferably the determination of the position and orientation of the milling body attached in the CAM device is determined fully automatically.

[0079] This ensures that the dental component is machined from the milling body and the cured plastic material in the desired manner. This is particularly important and helpful if the milling body is reattached to the CAM fixture during step C).

[0080] It is also preferably provided that after step A) and before step B) a step A2) is carried out: A2) Cleaning and / or pretreating the joining surface or the joining surface and the negative mold or the entire freely accessible surface of the first material at the bottom of the cavity including the joining surface and the negative mold, wherein preferably a chemical treatment of the surface of the first material is carried out during pretreatment, particularly preferably a chemical swelling of the surface of the first material with a monomer liquid, wherein the first material is a plastic composition containing a polymethyl methacrylate (PMMA) or consisting of a PMMA.

[0081] This creates a particularly stable bond between the first material and the cured plastic material.

[0082] Furthermore, it may be provided that the filling of at least one fluid polymerizable plastic in step B) is carried out by plugging and / or under overpressure, in particular in a pressure pot or in a pressure chamber with a pressure above normal pressure, preferably with a pressure of at least 150 kPa, particularly preferably with a pressure of at least 200 kPa, most preferably with a pressure of at least 200 kPa and at most 400 kPa.

[0083] This allows air inclusions between the first material and the injected fluid polymerizable plastic to be expelled, thus preventing or reducing weak points or surface damage in the dental mold. A "Palamat Elite" pressure polymerization unit, for example, can be used for this purpose. Furthermore, when stuffing or applying overpressure during the injection of at least one fluid polymerizable plastic in step B), boiling bubbles, such as those that occur with MMA-based plastics, can be avoided.

[0084] It may be provided that the filling of at least one fluid polymerizable plastic in step B) is carried out by plugging and / or under overpressure, in particular in a pressure pot or in a pressure chamber with a pressure of at most 1,000 kPa, preferably with a pressure of at most 500 kPa, particularly preferably with a pressure of at most 400 kPa.

[0085] It may also be provided that the filling of at least one fluid polymerizable plastic in step B) is carried out by plugging and / or under overpressure, preferably with a pressure of at least 100 kPa and a maximum of 1,000 kPa, particularly preferably with a pressure of at least 150 kPa and a maximum of 500 kPa, most preferably with a pressure of at least 200 kPa and a maximum of 400 kPa.

[0086] It can also be provided that the curing of the fluid polymerizable plastic in step B) is carried out by the application of heat and / or pressure, preferably taking place over a period of time between 10 minutes and 120 minutes, and particularly preferably between 30 minutes and 60 minutes.

[0087] This allows for good strength of the cured plastic material. The cured plastic material, produced from the fluid polymerizable plastic, is preferably a hot-cure or cold-cure polymer, or the fluid polymerizable plastic is the starting material of a hot-cure or cold-cure polymer. This makes the cured plastic material or the dental component suitable for allergy sufferers. Therefore, a hot-cure or cold-cure polymer is also suitable for the first material, but preferably one that is already fully cured.

[0088] The problems underlying the present invention are also solved by a dental molded body, in particular a dental prosthesis or bite splint, manufactured using a method described above.

[0089] The invention is based on the surprising finding that by providing and using a cavity for filling with a fluid polymerizable plastic as a second material on the top surface of a milling body for the production of a dental mold, it is possible to reduce the amount of the first material that must be subtractively milled or removed. This is achieved by cleverly selecting the position of the occlusal side of the dental mold during the CAD calculation of the associated CAM process. It is then sufficient to position the basal surface of the more abrasion-resistant prosthetic teeth or the occlusal part of the dental mold in the area of ​​the cavity floor.The lighter and easier-to-mill plastic used to create the denture base or basal part can then simply be filled into the prepared cavity. It only needs to be filled to the desired height, thus saving on the second plastic material. Every material saving automatically leads to time savings and reduces wear on the tools used, especially when working with particularly abrasion-resistant materials.

[0090] The present invention, in particular the milling body, the set, and the inventive method, achieves a high degree of accuracy in the fit of the dental form by directly milling the final shape. This eliminates the need for bonding prosthetic teeth and prevents inhomogeneities in the dental form resulting from a joining process. Simultaneously, complete curing of the solid body from the first material yields a particularly abrasion-resistant material for prosthetic teeth, and the use of a layered first material results in a particularly aesthetically pleasing prosthetic tooth material. In dental prostheses, a natural color transition from gum-colored to tooth-colored is achieved at the appropriate locations, eliminating the need for compromise. Particularly high aesthetics can be achieved by using multilayer milling discs as a tooth-colored solid body.

[0091] The production of dental components using the milling body and the inventive method can be carried out in a single two-stage manufacturing process. Therefore, a two-stage process can be used to produce the dental components. Furthermore, no different shape variants of blanks or milling bodies are necessary. A very small set of milling blanks of varying sizes can also be used, which may be advantageous.

[0092] The hollow milling body allows for reduced milling effort with less material removal and tool / milling wear. The user can determine and change the color of the fluid polymerizable plastic, for example, selecting or creating a veined appearance. The internal fill level indicator, which may already be present or created during the first milling operation, ensures reliable filling before the second milling operation.

[0093] An exemplary method according to the invention for manufacturing a dental prosthesis (complete dental prosthesis or partial dental prosthesis as a dental molded body) can have the following sequence: 1. Digital design of the prosthetic work and separation into multiple data segments. Data is required for the occlusal or oral upper surface, the basal underside of the dental prosthesis, and intermediate surface data consisting of the basal surface of the tooth-colored portions and the upper (oral) surface of the gingival portions as the connecting surface. When creating the data for the occlusal or oral upper surface, an additional offset to the gingival portions may need to be included in the CAD program. 2. Development of a suitable milling strategy for processing the individual process steps. This requires single-sided machining of the underside, as well as a zero-point shift appropriate to the milling cutter used, and preferably a further zero-point shift for machining both sides with corresponding zero-point shifts for the upper and lower surfaces separately. 3.Attach a milling body, at least the size of the tooth-colored portions, or a tooth-colored solid part of the milling body, to the milling machine and mill the intersurface data and the data for the occlusal or oral upper surface of the denture base from the basal side, optionally with a slight offset of the gingival portions (of the denture base) in the oral direction. The milling body or the tooth-colored solid part can preferably be provided with a position marker before positioning to allow for repositioning. 4.Removal of the partially milled blank and optional attachment of a cylindrical ring body as a circumferential wall of the milling body to create the cavity on the top surface for easier filling of the milled areas and necessary additional volumes, provided the milling body does not already have a cavity on the top surface bounded by the circumferential wall, wherein the circumferential wall is preferably formed integrally with the solid body of the milling body. 5. Filling or partial filling of the cavity with a prosthetic material in the form of a fluid polymerizable plastic (preferably with a powder-liquid system) and polymerization using the analogous manufacturing process. Afterwards, optionally removal of the support ring and, if necessary, post-treatment of the cured plastic material, such as by water curing. 6.Repositioning the filled, partially milled blank in the milling machine and milling the outer geometries basally and orally according to the final prosthesis design.

[0094] If a milling cutter with a tooth-colored solid body and a hollow shape on one side is used to reduce milling effort, the attachment of a cylindrical ring body mentioned in point 4 can be omitted.

[0095] Within the hollow mold, a fill mark or other suitable indication can be applied during step 3 to ensure that the user verifies sufficient but not excessive subsequent filling with the fluid polymerizable plastic in step 5.

[0096] As a final step in the process, the surface of the dental prosthesis can be finished by polishing and / or chemical treatment.

[0097] The following are exemplary embodiments of the invention explained with reference to eleven schematically represented figures, without, however, limiting the invention. These show: Figure 1 : a schematic perspective view of a top side of a first milling body according to the invention; Figure 2 : a schematic perspective transparent view of a side side of a second milling body according to the invention; Figure 3 : a schematic perspective view of an occlusal side of a dental prosthesis produced using a method according to the invention with the aid of a milling body according to the invention; Figure 4 : a schematic side view of the milling body after Figure 2 with a cross-sectional view and a position of the dental prosthesis to be produced according to Figure 3 ; Figure 5 : a schematic side view of the milling body after the Figures 2 and 4with a cross-sectional view in another section plane and with the position of the dental prosthesis to be produced according to Figure 3 ; Figure 6 : a schematic perspective view of the position of the dental prosthesis after Figure 3 in the milling body according to the Figures 2 , 4 and 5 ; Figure 7 : a schematic perspective view of the top side of the milling body according to the Figures 2 and 4 to 6 with the basal portions of the denture base protruding from the bottom of the cavity of the dental prosthesis according to Figure 3 ; Figure 8 : a schematic side view of the milling body after the Figures 2 and 4 up to 7 with a cross-sectional view and the position of the occlusal surfaces of the dental prosthesis to be produced according to Figure 3 ; Figure 9 : a schematic view of the top side of the milling body after the Figures 2 and 4 to 8after the subtractive shaping of the connecting surface and the negative form for the oral side of the denture base; Figure 10 : a schematic view of the basal side of the dental prosthesis after subtractive machining from the previously filled and then hardened plastic material; and Figure 11 : a schematic view of the occlusal or oral side of the dental prosthesis after subtractive machining from the first material and the previously filled polymerized hardened plastic material.

[0098] Figure 1 shows a schematic perspective view of a top side (in Figure 1 (above) 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 bottom surface opposite the top surface of the milling body 1 (in Figure 1(not visible). The first material can be a fully polymerized, tooth-colored plastic suitable for the production of denture teeth and possessing the necessary abrasion resistance. The first material should preferably be biocompatible as it is already present in milling body 1 in order to be suitable for use in a patient's oral cavity.

[0099] A cavity 4 with a base 6 is arranged on the upper surface of the milling body 1, the cavity 4 being laterally bounded by a circumferential wall 8. The base 6 is formed (preferably entirely) by the solid body 2. The circumferential wall 8 can be made of the first material or of another material. In particular, the circumferential wall 8 can be an annular body or a tube section that is placed onto the solid body 2 and firmly connected to it. The connection can be made by adhesive bonding. The solid body 2 can be cylindrical. The solid body 2 can have a step on its outer circumference for placing a ring-shaped body or tube section as a circumferential wall 8, onto which the ring-shaped body or tube section is placed flush. The circumferential wall 8 can, in particular, be a cylindrical tube section. The circumferential wall 8 can also be a metal ring-shaped body.

[0100] A marking 9 for determining the fill level in the cavity 4 can be arranged on an inner surface of the circumferential wall 8 facing the cavity 4. However, the marking 9 can also be added to the circumferential wall 8 during the process of manufacturing a dental molded part, for example, by milling it in. The marking 9 allows the fluid polymerizable plastic to be filled into the cavity 4 to be measured. Figure 1 (not shown) to be filled to the correct height.

[0101] At least one mounting bracket 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 mounting bracket 10 can project from the outer wall of the milling body 1 as an attached torus with a rectangular cross-sectional area. Alternatively to the one described in Figure 1The bracket shown, 10, can also be implemented in other ways, for example by means of protruding projections or recesses in the side surfaces. Bracket 10 is used for mounting in a CAM device (not shown).

[0102] The milling body 1 after Figure 1The milling body 1 can be used in a method according to the invention as follows. The milling body 1 is fixed in a subtractive CAM device, such as a computer-controlled multi-axis milling machine, using the holder 10. With the aid of a virtual CAD model of a dental component to be produced, a surface is created in the base 6 that corresponds to the interface between the first material and the cured plastic material to be produced from the fluid polymerizable plastic, according to the specifications of the virtual CAD model. In addition, the occlusal and oral surfaces of the surfaces consisting of the cured plastic material are machined from the solid body 2 as a negative mold using the subtractive CAM device.An offset can be used so that the negative mold is worked somewhat deeper, preferably at least a few tenths of a millimeter deeper, into the solid body 2 than would be required for the cured plastic material according to the CAD model with a direct negative mold. Additionally, the marking 9 can only be created on the circumferential wall 8 in this step. The newly created surface in the base 6 of the solid body 2 can then be cleaned.

[0103] The fluid polymerizable resin (not shown) can then be poured into cavity 4 to a height sufficient to allow the cured resin portion of the dental restoration to be completely machined from the cured resin material on the basal side, according to the virtual CAD model. The fluid polymerizable resin cures under pressure and temperature, forming the cured resin material. The intermediate product can then be reattached to the subtractive CAM device, and the dental restoration is machined using the CAM device, based on the occlusal and oral surfaces and the basal surfaces of the virtual CAD model of the dental restoration.A first part of the dental formwork (for example, denture teeth) then consists of the first material of the formwork, and a second part of the dental formwork (for example, a denture base) then consists of the hardened plastic material.

[0104] As an alternative to a dental prosthesis, the same procedure can be used to fabricate an occlusal splint whose occlusal surfaces consist of the first material and whose basal surfaces, in contact with the patient's teeth, consist of the hardened plastic material. This can be used to combine suitable material properties and / or to generate aesthetically pleasing color gradients.

[0105] Figure 2Figure 1 shows a schematic perspective transparent and side view of a second milling body 11 according to the invention. The milling body 11 comprises a solid body 12 made of a first material. The solid body 12 extends to a bottom surface 19, which is arranged opposite a top surface 21 of the milling body 11. The first material can be a fully polymerized, tooth-colored plastic suitable for the production of denture teeth and possessing the necessary abrasion resistance. The first material should already be biocompatible as it is present in the milling body 1 in order to be suitable for applications in a patient's oral cavity.

[0106] A cavity 14 with a bottom 16 is arranged on the upper surface 21 of the milling body 11, the cavity 14 being laterally bounded by a circumferential wall 18. The bottom 16 is preferably formed entirely by the solid body 12. The circumferential wall 18 can be made of the first material or of another material. In particular, the circumferential wall 18 can be an annular body or a tube segment that is placed onto the solid body 12 and firmly connected to it. The connection can be made by adhesive bonding. The solid body 12 can be cylindrical. The circumferential wall 18 can be a cylindrical tube segment. The circumferential wall 18 can also be a metal annular body.

[0107] A marking (in Figure 2(not visible) for determining a fill level in the cavity 14. However, the marking can also be applied to the circumferential wall 18 during the course of a method according to the invention, for example by milling. Based on the marking, the fluid polymerizable plastic to be filled into the cavity 14 (in Figure 2 (not shown) to be filled to the correct height.

[0108] At least one mounting bracket 20 for fixing the milling body 11 in a CAM device can be arranged on at least one outer wall of the milling body 11. The mounting bracket 20 can project from the outer wall of the milling body 1. The mounting bracket 20 can be formed by a projecting circumferential ring.

[0109] Figure 3Figure 1 shows a schematic perspective view of a dental prosthesis 22 manufactured using a method according to the invention with the aid of a milling body 1, 11 according to the invention. The dental prosthesis 22 has a denture base 24 made of a gum-colored, cured plastic material. Several denture teeth 26 can be connected to the denture base 24 as a one-piece row of teeth. The denture teeth 26 consist of the first material and are tooth-colored, preferably with a layered color structure to ensure a particularly good aesthetic appearance. The denture teeth 26 and the denture base 24 are directly connected to each other when they are manufactured using a method according to the invention. Figure 3The occlusal or oral surface 28 of the dental prosthesis 22 is recognizable. The dental prosthesis 22 is generated using a virtual CAD model, which was previously constructed in a known manner based on patient data and, if necessary, further processing. For the implementation of a method according to the invention, the virtual CAD model is computationally divided into a tooth-colored part for the prosthesis teeth 26 and a gum-colored part for the prosthesis base 24. In addition to the data for the occlusal or oral surface 28 of the dental prosthesis 22, the virtual CAD model includes the data for the basal side of the dental prosthesis 22 opposite the occlusal or oral surface 28 (in Figure 3 (not visible) as well as the data on the connection surface between the prosthetic teeth 26 and the prosthetic base 24. The connection surface is preferably located within the dental prosthesis 22. The in Figure 3The image shown therefore also corresponds to the external shape of the virtual CAD model.

[0110] With the Figures 4 to 10 The following is an example of the process of a method according to the invention using the milling body 11. Figure 2 and the virtual CAD model of the dental prosthesis 22 after Figure 3 explained.

[0111] This shows Figure 4 a schematic side view of the milling body 11 according to Figure 2 with a cross-sectional view and position of the dental prosthesis to be produced 22 according to Figure 3The virtual CAD model of the dental prosthesis 22 is thus drawn in the desired position in the milling body 11, either above or within the milling body 11. This, as with some of the following figures, serves to illustrate how the dental prosthesis 22 to be manufactured lies in the milling body 11 before it has been milled. The prosthesis teeth 26 are positioned in the milling body 11 such that they are completely contained within the area of ​​the solid body 12 made of the first material. This is shown in a Figure 5 The cross-sectional view shown is somewhat easier to see than in Figure 4, since the virtual CAD model of the dental prosthesis 22 is shown there in cross-section through the prosthetic teeth 26. A basal surface 30 of the virtual CAD model of the dental prosthesis 22, on the other hand, is partially located in the cavity 14, which is later filled with the fluid polymerizable resin. This is somewhat better shown in the perspective view of the Figure 6 and especially in the schematic perspective view of the top side of the milling body 11 according to Figure 7 to be seen in which the basal parts of the prosthesis base 24 of the dental prosthesis 22 protruding from the floor 16 of the cavity 14 can be seen.

[0112] First, the occlusal or oral surface 28 of the denture base 24 and the connecting surface between the denture teeth 26 and the denture base 24 are generated in the solid body 12 of the milling body 11 using a subtractive CAM device, such as a computer-controlled multi-axis milling machine, based on the virtual CAD model. For this purpose, a surface is created in the base 16 using the virtual CAD model, which corresponds to the connecting surface between the first material and the cured plastic material to be produced from the fluid polymerizable resin, according to the specifications of the virtual CAD model. In addition, the occlusal or oral surfaces 28 of the surfaces consisting of the cured plastic material are machined out of the solid body 12 as a negative mold 31 using the subtractive CAM device.An offset can be used so that the negative mold 31 is machined at least a few tenths of a millimeter deeper into the solid body 12 than the occlusal or oral surface 28 would actually require for the cured plastic material. The negative mold 31 thus serves as a casting mold for producing the occlusal or oral side of the denture base 24. The surface thus produced in the first material is shown in the schematic view on the top side of the milled body 11. Figure 9 Clearly visible. The connecting surface between the denture teeth 26 and the denture base 24 corresponds in Figure 9 the surface formed by the area of ​​the full body 12, which are part of the prosthetic teeth 26 and which are in Figure 9already marked as prosthetic teeth 26. In this connecting surface of the prosthetic teeth 26 are recesses 27 into which the fluid polymerizable plastic is poured for a more stable connection.

[0113] Additionally, a mark can be created on the surrounding wall 18. The newly created surface can then be cleaned. Afterwards, the [unclear text] can be [unclear text]. Figure 9 The cavity 14 shown is filled or packed with the fluid polymerizable plastic up to the mark. The fluid polymerizable plastic can then be cured (preferably under pressure and / or at a temperature higher than room temperature) (preferably for 30 to 60 minutes) to allow the cured plastic material 32 (see Figure 10 ) to form, from which the prosthetic base 24 is manufactured.

[0114] After hardening, the intermediate product thus obtained is clamped back into the subtractive CAM device (the multi-axis milling machine) and the occlusal or oral surface 28 of the dental prosthesis 22 (this time without the offset) as well as the basal surface 30 of the dental prosthesis 22 are subtractively manufactured from the intermediate product according to the virtual CAD model of the dental prosthesis 22. Figure 10 Figure 1 shows a schematic view of the basal side 30 of the dental prosthesis 22 after subtractive machining from the polymerized hardened plastic material 32 before the machining of the occlusal or oral side 28 is completed and the dental prosthesis 22 has been detached from the remaining milling body 11. Figure 11Finally, the dental prosthesis 22, detached from the surrounding wall 18, is shown. For final completion, cleaning, polishing and / or surface treatment of the dental prosthesis 22 can be carried out as post-processing.

[0115] The features of the invention disclosed in the preceding description, as well as in the claims, figures and embodiments, can be essential for the realization of the invention in its various embodiments, both individually and in any combination. Reference symbol list

[0116] 1, 11 Milling body 2, 12 Solid body 4, 14 Cavity 6, 16 Base 8, 18 Wall 9 Marking 10, 20 Retainer 19 Underside 21 Topside 22 Dental prosthesis 24 Denture base 26 Denture teeth 27 Recess 28 Occlusal surface / Oral surface 30 Basal surface 31 Negative mold 32 Plastic material

Claims

1. A milling body (1, 11) for producing a dental molding, wherein the milling body (1, 11) comprising a solid body (2, 12) made of a first material, the first material being biocompatible, wherein a cavity (4, 14) for receiving a fluid polymerizable plastics material is arranged on an upper side (21) of the milling body (1, 11), the cavity (4, 14) having a bottom (6, 16) and, starting from the edge of the bottom (6, 16), the cavity (4, 14) being laterally delimited by a circumferential wall (8, 18), the circumferential wall (8, 18) being annular, and wherein the solid body (2, 12) forming the bottom (6, 16) and the solid body (2, 12) extending as far as a lower side (19) of the milling body (1, 11), which lower side is arranged to be opposite the upper side (21) of the milling body (1, 11), wherein the dental molding is an occlusal splint, wherein the first material has a greater hardness than the cured plastics material, or the dental molding is a dental prosthesis, the dental prosthesis consisting of a gum-colored or respectively pink colored base and tooth-colored parts.

2. The milling body (1, 11) according to Claim 1, characterized in that the circumferential wall (8, 18) has a wall thickness of at most 20 mm, preferably of at most 10 mm, particularly preferably of at most 5 mm, and / or the circumferential wall (8, 18) is at least 5 mm high, preferably at least 15 mm high.

3. The milling body (1, 11) according to Claim 1 or 2, characterized in that a marker (9) for determining a fill level in the cavity (4, 14) is arranged on at least one inner side of the circumferential wall (8, 18) delimiting the cavity (4, 14), the marker (9) preferably comprising a scale having equidistant calibration marks and / or numbers, particularly preferably a length scale for determining a fill level or a volume of the fluid polymerizable plastics material in the cavity (4, 14), and / or the bottom (6, 16) of the cavity (4, 14) is flat and / or the circumferential wall (8, 18) has a cylindrical surface toward the interior of the cavity (4, 14), the circumferential wall (8, 18) preferably being tubular.

4. The milling body (1, 11) according to any one of the preceding claims, characterized in that the circumferential wall (8, 18) of the milling body (1, 11) is formed by a tube piece or an annular body which is fixed to the solid body (2, 12), the milling body (1, 11) preferably consisting of the first material and the tube piece or the annular body, or the circumferential wall (8, 18) of the milling body (1, 11) consists of the first material, the solid body (2, 12) and the circumferential wall (8, 18) preferably being formed in one piece, such that the milling body (1, 11) consists of the first material.

5. The milling body (1, 11) according to any one of the preceding claims, characterized in that the first material is a first plastics material, the first plastics material preferably being finally cured, and / or the first material is a layered first plastics material having a plurality of layers of different colors, with layer planes of the layers preferably being arranged in parallel with the bottom (6, 16) of the cavity (4, 14) or being arranged in parallel with a plane that is arranged to be perpendicular to the circumferential wall (8, 18), in particular in parallel with a base surface of a cylindrical inner wall of the circumferential wall (8, 18).

6. The milling body (1, 11) according to any one of the preceding claims, characterized in that the milling body (1, 11) is a blank having a cylindrical outer circumference, the circumferential wall (8, 18) forming a part section of the cylindrical outer circumference, a holder (10, 20) for fixing the blank to a CAM device preferably being arranged on the outer side of the cylindrical outer circumference, the holder (20) particularly preferably being a protruding ring extending circumferentially around the cylindrical outer circumference, and / or the milling body (1, 11) comprises at least one position marker on a surface outside the cavity (4, 14), which position marker is visible from the outside and allows the location and orientation of the milling body (1, 11) in the CAM device to be determined, the at least one position marker preferably being arranged in the region of at least one edge of the milling body (1, 11) which is visible from the direction of the upper side (21) and / or the lower side (19) of the milling body (1, 11), at least two position markers particularly preferably being provided which are visible both from the upper side (21) and from the lower side (19) of the milling body (1, 11).

7. The milling body (1, 11) according to any one of the preceding claims, characterized in that the volume of the material of the circumferential wall (8, 18) is at most half as large as the volume of the cavity (4, 14), the volume of the material of the circumferential wall (8, 18) is preferably at most a third as large as the volume of the cavity (4, 14), the volume of the material of the circumferential wall (8, 18) is particularly preferably at most a fifth as large as the volume of the cavity (4, 14), and / or the solid body (2, 12) comprises a circumferential shoulder, onto which the circumferential wall (8, 18) is placed, such that the circumferential wall (8, 18) fits flush with the solid body (2, 12) by an inner side, the circumferential wall (8, 18) preferably being bonded to the solid body (2, 12) circumferentially and over its entire surface.

8. A set for producing a dental molding comprising a milling body (1, 11) according to any one of the preceding claims and at least one fluid polymerizable plastics material and / or parent components for producing at least one fluid polymerizable plastics material, wherein the set preferably additionally comprises a device for introducing the at least one fluid polymerizable plastics material and / or for producing and mixing the at least one fluid polymerizable plastics material, wherein the dental molding is an occlusal splint, wherein the first material has a greater hardness than the cured plastics material, or the dental molding is a dental prosthesis, the dental prosthesis consisting of a gum-colored or respectively pink colored base and tooth colored parts.

9. A method for producing a dental molding using a milling body (1, 11) according to any one of Claims 1 to 7 or using a set according to Claim 8 or using a milling body (1, 11) for producing a dental molding, the milling body (1, 11) comprising a solid body (2, 12) made of a first material, the first material being biocompatible, wherein a cavity (4, 14) for receiving a fluid polymerizable plastics material is arranged on an upper side (21) of the milling body (1, 11), the cavity (4, 14) having a bottom (6, 16) and, starting from the edge of the bottom (6, 16), the cavity (4, 14) being laterally delimited by a circumferential wall (8, 18), the circumferential wall (8, 18) being annular, and the solid body (2, 12) forming the bottom (6, 16) and the solid body (2, 12) extending as far as a lower side (19) of the milling body (1, 11), which lower side is arranged to be opposite the upper side (21) of the milling body (1, 11), wherein, in the method, the dental molding is manufactured from at least two different materials, which are joined together in the method, wherein the method is characterized by the following chronological steps: A) producing a connecting surface, wherein the connecting surface defines the area between the first material and the cured plastic material to be produced from the fluid polymerizable plastic in the dental molding to be produced, and creating between the at least two different materials and a negative shape (31) of a part section of the surface of the dental molding to be produced in the bottom (6, 16) of the cavity (4, 14) in the milling body (1, 11) and thus in the first material of the milling body (1, 11) by means of a subtractive CAM method in accordance with a virtual three-dimensional model of an outer shape of the dental molding and a virtual shape of the connecting surface of the at least two different materials, the connecting surface and the negative shape (31) adjoining one another and the circumferential wall (8, 18) of the milling body (1, 11) being retained; B) introducing at least one fluid polymerizable plastics material into the cavity (4, 14) in the milling body (1, 11) and into the volume removed in step A) in the bottom (6, 16) of the milling body (1, 11), the at least one fluid polymerizable plastics material being introduced into the cavity (4, 14) to a fill level that is such that the circumferential wall (8, 18) comes into contact with at least one last-introduced or externally applied fluid polymerizable plastics material of the at least one fluid polymerizable plastics material, and curing the at least one fluid polymerizable plastics material in the cavity (4, 14) and in the volume of in the bottom (6, 16) of the milling body (1, 11) removed in step A), a cured plastics material being formed in the cavity (4, 14) in the milling body (1, 11) that is connected to the first material of the milling body (1, 11) in a secure and flush manner when curing the at least one fluid polymerizable plastics material; C) subtractively machining the cured plastics material from the direction of the upper side (21) of the milling body (1, 11) using a CAM method in accordance with a basal surface of the virtual model of the dental molding and subtractively machining the first material from the direction of the lower side (19) of the milling body (1, 11) using a CAM method in accordance with an occlusal surface of the virtual model of the dental molding, such that the dental molding is subtractively worked out of the cured plastics material and the first material connected thereto.

10. The method according to Claim 9, characterized in that the negative shape (31) of the part section of the surface of the dental molding that is produced in step A) in the bottom (6, 16) of the cavity (4, 14) in the milling body (1, 11) and in the first material of the milling body (1, 11) is generated to have an offset, the offset enlarging the volume of the virtual model of the dental molding in a region in which the dental molding is not intended to consist of the first material, and / or the dental molding is an occlusal splint, the first material having a greater hardness than the cured plastics material, or the dental molding is a dental prosthesis (22) in the form of a partial or full dental prosthesis, the dental prosthesis (22) comprising a prosthesis base (24) and at least one prosthetic tooth (26) and the at least one prosthetic tooth (26) being manufactured from the first material and the prosthesis base (24) being manufactured from the cured plastics material, the first material being tooth-colored and the cured plastics material being gum-colored, the first material preferably having a greater hardness and / or abrasion resistance than the cured plastics material.

11. The method according to Claim 9 or 10, characterized in that in step B), at least one of the at least one fluid polymerizable plastics materials fully wets at least the surfaces generated in the first material in step A) during introduction, and / or in step C), the first material and the cured plastics material are subtractively machined from the direction of the lower side (19) of the milling body (1, 11) using the CAM method in accordance with the occlusal surface of the virtual model of the dental molding, and / or in step C), the cured plastics material and the first material are subtractively machined from the direction of the upper side (21) of the milling body (1, 11) using the CAM method in accordance with the basal surface of the virtual model of the dental molding.

12. The method according to any one of Claims 9 to 11, characterized in that in step A), at least one marker (9) is applied to the inner side of the circumferential wall (8, 18) delimiting the cavity (4, 14) in the milling body (1, 11), in particular, the at least one marker (9) is generated in the inner side of the circumferential wall (8, 18) by the subtractive CAM method, the distance between the at least one marker (9) and the bottom (6, 16) of the cavity (4, 14) being determined in accordance with the virtual model of the dental molding, the at least one marker (9) preferably being at least one calibration mark, in step B), the at least one fluid polymerizable plastics material being introduced up to the height of the at least one marker (9) in the cavity (4, 14), and / or before step A) or before step B) and after step A), an annular body or a tube piece is fastened to the solid body (2, 12), such that the annular body or the tube piece forms the circumferential wall (8, 18), the annular body or the tube piece preferably being removed again after step B) or before step C).

13. The method according to any one of the Claims 9 to 12, characterized in that before step C), a zero shift is calculated to specify the plane of the surface of the cured plastics material generated in step B), and in step C), the zero shift is taken into account to the effect that the subtractive machining begins in the plane of the surface of the cured plastics material, and / or in step C), the position and location of the milling body (1, 11) fastened in the CAM device is determined on the basis of at least one marker on the milling body (1, 11) at least once, and the position and location of the milling body (1, 11) is taken into account while controlling the CAM device, the determination of the position and location of the milling body (1, 11) fastened in the CAM device preferably being determined fully automatically.

14. The method according to any one of the Claims 9 to 13, characterized in that after step A) and before step B), a step A2) is carried out: A2) cleaning and / or pretreating the connecting surface or the connecting surface and the negative shape (31) or all of the freely accessible surface of the first material on the bottom (6, 16) of the cavity (4, 14) including the connecting surface and the negative shape (31), a chemical treatment of the surface of the first material preferably taking place during the pretreatment, particularly preferably chemical swelling of the surface of the first material with a monomer liquid, the first material being a plastics composition containing a polymethyl methacrylate (PMMA) or consisting of a PMMA, and / or the introduction of at least one fluid polymerizable plastics material in step B) takes place by plugging and / or is carried out at an overpressure, in particular in a pressure pot or in a pressure chamber having a pressure above normal pressure, preferably at a pressure of at least 150 kPa, particularly preferably at a pressure of at least 200 kPa, most particularly preferably at a pressure of at least 200 kPa and at most 400 kPa.

15. The method according to any one of the Claims 9 to 14, characterized in that the curing of the fluid polymerizable plastics material in step B) takes place under the effect of heat and / or pressure, the curing preferably taking place over a period of between 10 minutes and 120 minutes, particularly preferably of between 30 minutes and 60 minutes.