Dental layered prostheses and the production of a layered dental prosthesis

Abstract

The subject matter of the invention is a dental layered prosthesis comprising at least one inner tooth region and at least one tooth layer partially to completely surrounding the inner tooth region, and optionally at least one cervical tooth layer, as well as a method for producing the same and a computer program product for producing the prosthesis.

Description

[0001] Dental layered prostheses and their manufacture

[0002] a layered dental prosthesis

[0003] The invention relates to a dental layered prosthesis comprising at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, and optionally at least one neck layer, as well as a method for its manufacture and a computer program product for manufacturing the prosthesis.A preferred dental layered prosthesis comprises at least one first component, in particular a first layered and / or layered available first component, selected from the at least one inner tooth region, which is at least one tooth layer, and optionally at least one cervical layer, each independently available in a material-building process, and at least one remaining component, in particular a remaining component with a homogeneous matrix, in particular a matrix not layered and / or layered available, of the first component available in a primary forming process.

[0004] Typically, prefabricated dental prostheses are cured in industrial manufacturing processes using thermal polymerization of the entire prosthesis in a production mold. These prostheses are usually methacrylates with low to medium levels of inorganic fillers. Manual fabrication of multi-layered prostheses is possible with methacrylates. Additive or subtractive fabrication of dental prostheses in dental laboratories, which, due to the manufacturing process, are made from a single material, is also known.

[0005] However, there is a need to be able to produce dental prostheses from composite-like materials that have improved mechanical properties compared to the usual methacrylate-containing compositions.

[0006] DE 102 49 518B3 discloses the production of artificial teeth with an outer cutting layer and an underlying dentin layer with an intermediate fluorescent material layer. The artificial teeth are formed almost exclusively from a polymer comprising methacrylates, such as PMMA. DE 102006026776 A1 discloses a typical application of the artificial teeth in a dental prosthesis and the production of the gingival area of ​​the prosthesis using 3D printing from denture resin. DE 1017 105044 B9 discloses a milling process for artificial teeth, such as CNC milling on a CAM machine, to produce the connection geometry for the artificial teeth on the cervical to radicular side of the teeth, so that they can be precisely adapted to a denture base, an abutment, or an implant connection geometry. However, due to the nature of this milling process, increased breakage of the polymer artificial tooth components can occur.In the past, attempts were also made to mechanically stabilize the mechanical stability of tooth-shaped components by inserting foils, as described in DE 10 2014 109 098 A1, in order to counteract the increased mechanical loads on implant-supported dentures and bridges caused by malloading.

[0007] Due to increasingly faster milling production processes and / or the manufacture of dental prostheses in so-called "chair-side" applications, which take place in a less reproducible environment, especially due to changing users, there is a need to further increase the mechanical properties of the artificial tooth shapes in order to meet the increased demands of milling processing and at the same time the requirements for significantly longer durability, even under incorrect stress on the teeth.

[0008] One object of the invention was therefore to provide a method and suitable materials that would allow for the production of a multi-layered dental prosthesis that is cost-effective and simultaneously meets increased mechanical requirements. Furthermore, the object was to provide a method for the industrial production of multi-layered dental prostheses that nevertheless allows for a high degree of flexibility with regard to the individualization of each prosthesis, such as artificial tooth shapes. Finally, the object was to adapt the mechanical properties of the prostheses to those of previously known denture resins and to those of crowns produced from milled parts using material removal, which are manufactured from prefabricated prostheses or blanks using milling.

[0009] The object of the invention could be achieved by a dental layered prosthesis according to claim 1 and by a method according to claim 13. Furthermore, the objects could be achieved by an intermediate product of the dental layered prosthesis according to claim 17 and a multi-part casting mold according to claim 18, the computer program product according to claim 19, the virtual dental layered prosthesis according to claim 20, and the use according to claim 21. Preferred embodiments of the invention are disclosed in detail in the dependent claims and in the description. According to the invention, the object of the present invention is achieved by providing a dental layered prosthesis comprising at least the following components, in particular first components, comprising at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, wherein

[0010] a) at least one or more of the components selected from at least one inner tooth region, at least one tooth layer, and optionally at least one cervical layer, each of which is / are independently available in a material build-up process, and

[0011] b) at least one or more of the components, in particular at least one or more components differing from a), selected from the at least one inner tooth region, comprising at least one tooth layer, and optionally at least one cervical layer, are / are each independently obtainable in a primary forming process, preferably wherein the at least one or more components a) and b) together form a layered dental prosthesis. The aforementioned a) components may preferably be referred to as first components and b) as remaining components of the first component.

[0012] Advantageously, the a) components are at least one layer-by-layer component and / or one that is available layer by layer, preferably each of which is available independently in a material-building process, in particular the first component and

[0013] b) the at least one component with a homogeneous matrix, in particular a matrix that is not built up layer by layer and / or not obtainable layer by layer, or the at least one remaining component of the components, in particular the first components, which are in particular obtainable or were obtained in a primary forming process, the dental layered prosthesis.

[0014] The at least one component a) preferably comprises at least one layer-by-layer built-up and / or layer-by-layer obtainable component, in particular a first component selected from at least one inner tooth region, preferably dentin core, at least one tooth layer, and optionally at least one cervical layer, which in particular are each independently obtainable or were obtained in a material build-up process, in particular in a layer-by-layer material build-up process.

[0015] The at least one component b) preferably comprises at least one matrix or component that is not built up layer by layer and / or is not obtainable layer by layer, in particular a first component which is selected from at least one inner tooth region, preferably dentin core, at least one tooth layer, and optionally at least one cervical layer, which in particular are each independently obtainable or were obtained in a primary forming process, in particular in a compression molding and / or casting process.

[0016] The invention thus relates to a layered dental prosthesis comprising as components at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, preferably two to ten tooth layers, and optionally at least one cervical layer, in particular two to ten cervical layers, wherein a) at least one of the components selected from the at least one inner tooth region, the at least one tooth layer, and optionally at least one cervical layer, is each independently obtainable in a material build-up process, and b) at least one component, in particular at least one component differing from a), selected from the at least one inner tooth region, the at least one tooth layer, and optionally at least one cervical layer, is each independently obtainable in a primary forming process, in particular wherein the components, in particular each component,a) and b) form a dental layered prosthesis.

[0017] In an alternative, particularly preferred embodiment, the invention relates to a dental layered prosthesis comprising as components at least one inner tooth region and at least one tooth layer, in particular two to ten, partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, wherein a) at least one component, in particular a first component, comprising the at least one tooth layer and optionally the at least one cervical layer, has, compared to b) the at least one inner tooth region as at least one component, in particular as at least one remaining first component, a content of at least one inorganic filler or organic filler mixture that is at least 5 wt.% higher, in particular greater than or equal to 7.5 wt.%, preferably greater than or equal to 10 wt.%, particularly preferably greater than or equal to 15 wt.%, preferably greater than or equal to 20 wt.%.-%, in particular in relation to the total composition of 100 wt.% of the composition, in particular a hardenable and / or polymerizable composition, preferably a composition A, B, C and / or D, of the respective component. The aforementioned respective components with different inorganic filler content can form the dental layered prosthesis. Particularly preferably, the dental layered prosthesis advantageously comprises at least two first components, wherein at least one first component is independently obtainable or is obtained in a material build-up process and at least one remaining component of the at least two first components is obtainable or is obtained in a primary forming process.A remaining component can be synonymously referred to as another component, wherein advantageously a) at least one component and b) at least one other component form a dental layered prosthesis comprising these components.

[0018] The dental layered prostheses according to the invention can thus be manufactured by combining different manufacturing processes and / or components available in different manufacturing processes in a single process and / or in the dental layered prosthesis. The inner tooth region is preferably a dentin core. The at least one tooth layer that partially or completely surrounds the inner tooth region, or the at least one surrounding tooth layer that partially or completely surrounds the inner tooth region and optionally at least one tooth layer arranged on the inner tooth region, is preferably arranged at least in the region of a tooth crown, in particular the dentin core of the dental layered prosthesis, in particular a tooth, and in particular an artificial tooth.

[0019] The invention thus also relates to a dental layered prosthesis and its intermediate product e), comprising at least one component comprising at least one layered component and / or layered component, in particular a first component selected from at least one inner tooth region, at least one tooth layer, and optionally at least one cervical layer, and at least one component, in particular at least one remaining component of the first components, comprising i) at least one component with a homogeneous matrix, in particular a matrix of the component that is not layered and / or not layered, in particular the remaining component, and / or ii) dental composite material, in particular this at least one component, in particular the remaining component of the first components, is formed from a) dental composite material or b) a PMMA-containing,in particular with a PMMA content of greater than or equal to 40 wt.%, in particular greater than or equal to 60 wt.%, with respect to the total composition of 100 wt.% of the hardened and / or polymerized composition. In particular, the invention relates to a dental layered prosthesis comprising at least one inner tooth area and optionally at least one tooth layer and optionally at least one cervical layer, which consist of a dental composite material, in particular of a hardened or polymerized composition, in particular composition A or composition B, in particular each polymerized or polymerizable, comprising greater than or equal to 30 wt.% of at least one inorganic filler or an inorganic filler mixture, in particular 40 to 90 wt.%, preferably 40 to 80 wt.% or 40 to 70 wt.%, preferably 50 to 70 wt.%, or alternatively 70 to 90 wt.% of at least one inorganic filler.with regard to the overall composition of 100 wt.%. Preferably, the invention relates to a dental layered prosthesis comprising at least one inner tooth region and optionally at least one tooth layer and optionally at least one cervical layer, obtained or available in the inventive method and preferably a method carried out by a computer program product.

[0020] In a preferred alternative, the at least one inner tooth region and optionally the at least one tooth layer and optionally at least one cervical layer can consist of a dental prosthesis resin, in particular of a hardened or polymerized composition, in particular a polymerized or hardenable and / or polymerizable composition, in particular composition C (example: industrial, PPMA), wherein the polymerized composition is formed by polymerization of a hardenable and / or polymerizable composition comprising greater than or equal to 40 wt.% PMMA powder (polymethyl methacrylate) as a powder component and greater than or equal to 10 wt.%-% of a polymerizable liquid comprising MMA (methyl methacrylate) and optionally comprising at least one crosslinker, in particular di- to deca-functional monomers, preferably with two to ten olefinic groups per monomer, initiators, accelerators, activators and / or other excipients and / or optionally active ingredients, and optionally comprising 0 to 30 wt.% inorganic fillers, in particular 1 to 30 wt.% inorganic fillers, in the total composition of the polymerizable composition of 100 wt.%. Advantageously, the polymerizable liquid contains more than 80 wt.% MMA, in particular more than or equal to 90 wt.% MMA with respect to the total composition of 100 wt.%.-% of the polymerizable liquid, as well as optionally crosslinkers, in particular di- to deca-functional monomers, preferably with two to ten olefinic groups per monomer, initiators, accelerators, activators, and / or other excipients and / or optionally active ingredients. Advantageously, the powder component contains more than 90 wt% PMMA, in particular more than or equal to 95 wt% PMMA, with respect to the total composition of 100 wt% of the powder component, as well as optionally core-shell particles, prepolymers, initiators, accelerators, activators, and / or other excipients and / or optionally active ingredients. Advantageously, the polymerizable liquid and powder components are mixed in a weight ratio of 2:1 to 1:2 to obtain the polymerizable composition, in particular composition C.

[0021] The dental prosthesis resin, in particular composition C, is suitable for the fabrication of the inner tooth area after mixing the PMMA powder and the polymerizable liquid. A further composition, in particular polymerizable composition D, for the fabrication of at least one inner tooth area, in particular comprising polymerized composition D, may comprise an autopolymerizable two-component composition comprising A) at least one liquid monomer component, in particular greater than or equal to 40 wt.% MMA, preferably greater than or equal to 90 wt.%, with respect to the total composition of 100 wt.% of component A), and comprising B) at least one powdered component, in particular comprising greater than or equal to 40 wt.% PMMA, preferably comprising greater than or equal to 90 wt.% to 100 wt.% PMMA, with respect to the total composition of 100 wt.% of component B), wherein the composition in component (A) and / or (B)

[0022] (i) at least one initiator or initiator system for autopolymerization,

[0023] (ii) and optionally core-shell particles modified by an elastic phase and (iii) optionally comprising at least one urethane (meth)acrylate and / or a mono- and / or di- to decafunctional (meth)acrylate monomer, in particular wherein the total composition comprising components A) and B) is 100 wt.%. Preferably, component A) monomer and component B) powder can be mixed in a weight ratio of 1 : 50 to 50 : 1, in particular in a weight ratio of 8 to 11 powder to 5 to 8 monomer components.

[0024] The invention relates in particular to at least one tooth layer and optionally at least one cervical layer and optionally at least one inner tooth area, which consist of a dental composite material, in particular of a hardened or polymerized composition, preferably available from a) a hardenable and / or polymerizable composition, a polymer-containing composition and / or a monomer-containing composition, preferably composition A or B, or mixtures comprising two of the aforementioned compositions comprising at least 30 wt.% of at least one inorganic filler, in particular 40 to 90 wt.%, preferably 40 to 80 wt.% or 40 to 70 wt.%, preferably 50 to 70 wt.%, or 50 to 90 wt.%, or alternatively 70 to 90 wt.%, in particular 30 to 85 wt.%, or 50 to 69 wt.%, in particular 30 to 65 wt.%.-%, at least one inorganic filler, in relation to the total composition of 100 wt.% and which are preferably available or produced by a material-building process.

[0025] A layered dental prosthesis can also comprise at least two, in particular two to 16, preferably two to 14, preferably two to 6, teeth connected proximally, in particular interdentally, especially as part of a multi-unit dental bridge. It may be preferred if such a layered prosthesis comprises a support structure, in particular a superstructure. The superstructure is preferably a component of the inner tooth area or the inner tooth area itself. The superstructure can be formed from dental composite material, a metallic alloy such as cobalt-chromium, precious metals and alloys comprising precious metals such as gold, and / or ceramic materials and hybrid materials comprising the aforementioned precious metals or alloys and ceramic materials.

[0026] In the inventive method, for example, an inner tooth region can be produced in a primary forming process, such as a casting process, and subsequently, in a subsequent primary forming process, it can be positioned in a multi-part casting mold with tooth layers that can be produced in a material build-up process to fit precisely this tooth region. In this subsequent process, for example, the inner tooth region with the at least one tooth layer produced in the material build-up process, in particular a first tooth layer, can be positioned in a multi-part casting mold, and in a subsequent process step, it can be partially or completely surrounded, in particular encased, by a composition containing a monomer and optionally a polymer in the multi-part casting mold, and the inner tooth region and the aforementioned tooth layer can be enclosed.In particular, a layered tooth layer is available from the material-building process, in which the composition is embedded, especially encased. Subsequently, a hardening and / or polymerization of the composition can take place.

[0027] A layered dental prosthesis can be obtained, which in this example is made from, for instance, three coordinated, different materials and can be combined into a single, coordinated process. By combining the different processes and / or the virtual components of the layered dental prosthesis, it is possible to prefabricate precisely fitting individual components and produce a specific layered dental prosthesis in a single process, in which, in particular, the mechanical properties of the individual components can be specifically tailored to one another.

[0028] A layered inner tooth region or layered tooth layer is defined in particular as a layered a) component, and / or a layered component, especially a first component, that can be manufactured or obtained using a layered material build-up process. A b) component, especially a remaining component, with a homogeneous matrix, especially a matrix that is not layered and / or not available layered, is defined in particular as a component that is available using a primary forming process, such as casting or injection molding.

[0029] Furthermore, the inventive method makes it possible to produce a support geometry as the inner tooth region using a primary forming process, such as a press mold or casting process, or a material build-up process. The support geometry, by providing at least one tooth layer and optionally at least one cervical layer, can form a multi-unit bridge comprising at least two or more teeth. The teeth of this multi-unit bridge are bridged mesially, in particular by the support geometry as the inner tooth region.

[0030] The invention relates to a dental layered prosthesis comprising at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, wherein at least one component, in particular a first component, in particular a layered component, selected from the at least one inner tooth region, the at least one tooth layer, and optionally at least one cervical layer, is each independently obtainable in a material build-up process, in particular in a layered material build-up process, and at least one component, in particular a remaining component of the first components, is obtainable in a primary forming process, in particular a primary forming process, i) using a mold, in particular a multi-part mold, and / or ii) which is not a material build-up process.In particular, no layer-by-layer material build-up process. Preferably, the primary forming process comprises or is selected from a compression molding process and / or a casting process, particularly preferably a casting process, preferably low-pressure casting, pressure casting, gravity casting, injection molding, and / or injection molding, in a multi-part mold. Primary forming processes include primary forming from the liquid state, primary forming from the plastic state, and / or primary forming from the slurry state, particularly as casting or compression molding, especially a casting process. A primary forming process comprises processes in which the remaining component and / or the layered dental prosthesis is produced in a form, such as a mold, such as a multi-part mold, particularly comprising two-part molds. A material build-up process is preferably an additive manufacturing process.

[0031] A dental layered prosthesis may comprise at least one tooth, in particular an artificial tooth, such as a layered tooth, comprising polymeric material, in particular the prosthesis, such as the tooth, comprises a polymeric material and a content of at least one inorganic filler of greater than or equal to 30 wt.%, in particular of greater than or equal to 50 wt.% in relation to the prosthesis, such as the tooth.

[0032] According to the invention, a primary forming process, in particular a press mold or casting process, is a process in which a component, such as the remaining component of the first component, is produced or obtained from a hardenable and / or polymerizable composition, in particular a hardenable and / or polymerizable composition with an inorganic filler content of greater than 30 wt.%, preferably 40 to 90 wt.%, particularly preferably 40 to 80 wt.% or 50 to 70 wt.%, with a total content of 100 wt.% of the polymerizable composition, in particular composition A or B or a mixture thereof, in at least one cavity of a multi-part casting mold. The aforementioned composition can preferably be used to produce a tooth layer and / or tooth neck layer in a primary forming process.A preferred primary forming process is a compression molding and / or casting process, in particular using a hardenable and / or polymerizable composition, especially a hardenable and / or polymerizable composition with a content of at least one inorganic filler of greater than 30 wt.%.

[0033] Alternatively, a preferred primary forming process, in particular a press mold or casting process, is a process in which, from a hardenable and / or polymerizable composition, in particular a hardenable and / or polymerizable composition with a content of inorganic filler(s) of a) 0 to 35 wt.%, preferably 5 to 20 wt.%, or / and optionally b) 20 to 50 wt.%, preferably 25 to 50 wt.%, more preferably 25 to 35 wt.%, the hardenable and / or polymerizable composition with a total content of 100 wt.% of the polymerizable composition, in particular a composition A, B, C and / or D or a mixture comprising at least two of these, preferably comprising composition C and / or D, is produced in at least one cavity of a multi-part casting mold, in particular at least one remaining component of the first component.The aforementioned composition, in particular with a), can preferably be used for the production of an inner tooth area and optionally a cervical layer in a primary forming process.

[0034] A composition, in particular A and / or B, with b) can preferably be used in a material build-up process for the production of a tooth layer.

[0035] In particular, the invention relates to a dental layered prosthesis comprising at least one inner tooth region and at least one tooth layer and optionally at least one cervical layer, which consist of a dental composite material, in particular of a hardened or polymerized composition, in particular a composition A, B, C and / or D, in particular each polymerized or polymerizable, wherein the prosthesis comprises at least 30 wt.% of at least one inorganic filler, in particular 40 to 90 wt.%, preferably 40 to 80 wt.% or 40 to 70 wt.%, preferably 50 to 70 wt.%, or alternatively 70 to 90 wt.% of at least one inorganic filler, in relation to the total composition of 100 wt.%.

[0036] A particularly preferred prosthesis comprises an inner tooth area and optionally a tooth layer and optionally at least one cervical layer, wherein the inner tooth area comprises a) 0 to 35 wt.% or b) 20 to 50 wt.%, in particular 20 to 35 wt.%, inorganic fillers in the overall composition of the inner tooth area and optionally at least one tooth layer and optionally at least one cervical layer comprising 40 to 90 wt.%, in particular 50 to 90 wt.%, inorganic fillers, in each case in the overall composition of the tooth layer and optionally cervical layer. In particular, available from a hardened and / or polymerized composition, in particular composition A, B, C and / or D.

[0037] Material-building processes, in particular layer-by-layer material-building processes, are not considered primary forming processes according to the invention.

[0038] The invention relates to a dental layered prosthesis comprising at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, and optionally at least one cervical layer as components, wherein

[0039] a) at least one component selected from the at least one inner tooth region, comprising at least one tooth layer and optionally at least one neck layer, is each independently available in a material build-up process and b) at least one component is available in a primary forming process, in particular a primary forming process using a multi-part mold, in particular a casting mold, which is designed in at least two parts.

[0040] A preferred alternative is a layered dental prosthesis, in particular a tooth or multi-unit bridge comprising at least two proximally connected teeth, comprising at least one inner tooth region, in particular a dentin core, and at least one tooth layer partially or completely surrounding the inner tooth region, in particular comprising at least one inner tooth layer and / or a tooth layer in the form of a crown, and optionally at least one cervical layer, comprising at least one component, in particular a first component, selected from at least one layered inner tooth region, at least one layered tooth layer, and optionally at least one layered cervical layer, in particular each of which were independently obtained or manufactured or are available in a layered material build-up process, wherein the at least one inner tooth region and / or the at least one tooth layer,and optionally at least one cervical layer is independently available or has been preserved in a material build-up process, and at least one component, in particular the remaining component of the first components, is available in a primary forming process. The aforementioned components from the material build-up and primary forming processes are advantageously coordinated with each other, as complementary, and advantageously form a prosthesis.

[0041] A preferred dental layered prosthesis comprises at least one component, in particular a first component, in particular a first layered and / or layered component, in particular a first component selected from the at least one inner tooth region, which is at least one tooth layer, and optionally at least one cervical layer, in particular each being independently available in a material build-up process, and at least one remaining component, in particular with a homogeneous matrix, in particular a matrix not layered and / or not available in layers, of which the components are in particular available in a primary forming process, in particular a primary forming process using a mold, such as a casting mold. A preferred dental layered prosthesis is one that does not require the use or integration of foils as disclosed in the prior art.According to a preferred alternative, the layered dental prosthesis does not include a film, in particular no polymeric film, preferably no PVC film. A film is defined as a sheet structure obtainable by extrusion from a polymer-containing composition.

[0042] Preferably, the at least one tooth layer, which partially or completely surrounds the inner tooth area, comprises at least one inner tooth layer, in particular two to ten inner tooth layers, advantageously overlapping tooth layers, and / or a tooth layer, in particular an outer tooth layer, in the form of a tooth crown. Alternatively, the at least one tooth layer can surround oral areas, in particular labial areas and / or occlusal areas, such as the incisal edge. The tooth layer advantageously has an inorganic filler content of greater than or equal to 50 wt.% with respect to the total composition of this tooth layer.

[0043] According to a preferred alternative, the components, in particular at least one first component and at least one remaining component of the first component, form a layered dental prosthesis.

[0044] According to a further alternative, b) the at least one component is obtainable in the primary forming process, in particular a compression molding or casting process, from a hardenable and / or polymerizable composition, in particular a polymerizable monomer and optionally a composition containing polymers, particularly preferably composition A, B, C and / or D, particularly preferably C and / or D or mixtures thereof, preferably by compression molding or casting, preferably injection molding, in particular for the formation of the dental layered prosthesis or an intermediate product of the dental layered prosthesis.In this context, "press molds" are understood to mean that the open mold or the cavity of the mold is pre-filled with a hardenable and / or polymerizable composition and, optionally, before or after positioning the at least one inner tooth region obtainable by a material build-up process and / or at least one tooth layer and, optionally, the at least one tooth neck layer in the open mold, in particular in the at least one cavity of the mold. Subsequently, the mold is closed, with excess composition being expelled; in particular, the cavity is formed by closing the mold. Alternatively, the composition can be injected into the closed mold, in particular into the cavity.It is preferred that the one component, in particular the remaining component, is at least one tooth layer and / or optionally at least one cervical layer, and that the hardenable and / or polymerizable composition, in particular composition A and / or B, comprises 30 to 90 wt.%, in particular 40 to 80 wt.%, preferably 40 to 70 wt.% or 50 to 70 wt.% inorganic fillers. Particularly preferably, the one component, in particular the remaining component, can be an outer cervical layer of the layered prosthesis, which partially or completely encloses the inner tooth area and / or at least one cervical layer on the outside.

[0045] According to a further preferred alternative, at least one component, in particular a remaining component of the first component, can be provided which b) is obtainable in the primary forming process from a hardenable and / or polymerizable composition, in particular a polymerizable monomer-containing composition, in particular by compression molding or casting, preferably injection molding, and which is selected from the at least one inner tooth region, in particular dentin core, and / or the at least one tooth layer, in particular enamel layer, and optionally at least one cervical layer.

[0046] According to a further preferred alternative, at least one component, in particular a first component, can be provided which a) is obtainable in the material-building process, in particular a layer-by-layer material-building process, from a hardenable and / or polymerizable composition, polymer-containing compositions and / or monomer-containing compositions, in particular composition A and / or B or a mixture of one of the compositions, a layer-by-layer or layer-by-layer built-up component, in particular a first component, or is produced layer-by-layer. Preferably, the component, in particular the first component, can be provided by layer-by-layer hardening and / or layer-by-layer polymerization or is obtainable by layer-by-layer hardening and / or layer-by-layer polymerization.A layer-polymerized component, particularly a first component, is particularly preferred, especially a component obtainable by layer-polymerization, such as the first component. Preferably, the component, such as the first component, is obtainable, in particular, the at least one inner tooth region and / or the at least one tooth layer, and optionally at least one cervical layer, or consists of a hardened and / or polymerized composition, in particular a dental composite, composition A and / or composition B, or a mixture comprising at least two of the aforementioned compositions, preferably obtainable by polymerization of the composition. In particular, in a material-building process with preferably i) a greater than or equal to 30 wt.% of at least one inorganic filler in the total composition of 100 wt.-% of a hardenable and / or polymerizable composition, in particular composition A and / or B, in particular for the production of the cervical layer of the tooth, in particular comprising 40 to 90 wt.%, preferably 40 to 80 wt.% or 40 to 70 wt.%, preferably 50 to 70 wt.%, or 50 wt.% to 90 wt.%, or alternatively comprising 70 to 90 wt.%, or ii) 0 to 35 wt.%, preferably 0 to 25 wt.%, preferably 5 to 20 wt.%, inorganic fillers in the total composition of 100 wt.% of a hardenable and / or polymerizable composition, in particular composition A and / or B, in particular for the production of the at least one inner tooth area.

[0047] Alternatively, a screw channel with a first and second opening, and optionally comprising a screw seat, can be produced, for example, from a thermoplastic composition and / or a wax-containing composition, particularly with a melting point below 180 °C, preferably below 150 °C, using a material build-up process. This screw channel can be arranged as an insert in a mold, such as a multi-part mold, to obtain an inner tooth area with a screw channel in the molding process. Advantageously, the wax melts above the process temperature of the molding process. The screw channel can be straight or angled. The invention can therefore also relate to an inner tooth area with a screw channel, in particular a straight or angled screw channel, with a first and second opening, and optionally comprising a screw seat.The invention can also relate to at least one tooth layer and optionally at least one cervical layer, each independently comprising a first and / or second opening of the screw channel of the inner tooth region congruent with the first and / or second opening of the at least one tooth layer and optionally at least one cervical layer. The invention can thus also relate to a prosthesis with at least one screw channel, in particular a tooth with a screw channel or a dental arch with one or more screw channels, advantageously with one screw seat per screw channel.The openings are designed and arranged such that a screw can be passed through the openings, in particular oral, lingual, or aboral openings, of the inner tooth area, at least one tooth layer, and optionally at least one cervical layer of a layered prosthesis, in particular to attach the layered prosthesis to an abutment and / or an implant, and especially to the implant connection geometry. The invention may also include a method, independently of one another, for producing at least one screw channel in a prosthesis, an intermediate product, an inner tooth area, at least one tooth layer, and / or optionally at least one cervical layer.

[0048] Components, particularly first components, that are manufactured using a linear material build-up process or from powdered materials using a material build-up process are also considered to be built up layer by layer or available layer by layer. All 3D printing processes are considered material build-up. 3D printing processes using liquid monomer-containing compositions are particularly preferred. Advantageously, an inner tooth region, especially a superstructure that preferably comprises two or more proximally connected inner tooth regions, can also be available or obtained using a material build-up process such as selective laser sintering (SLS) and / or selective laser melting (SLM).

[0049] All material-building processes are preferably considered layer-by-layer material-building processes. In all material-building processes, layer-by-layer components, in particular first components, are preferably available.

[0050] It is further preferred that a layer-by-layer material build-up process is available, in particular from a composition containing at least one polymer and / or at least one monomer, comprising at least one inner tooth region, and / or at least one tooth layer, and optionally at least one tooth neck layer. Preferably, a layer-by-layer component, in particular a first component, is available comprising at least one layer-by-layer inner tooth region, at least one layer-by-layer tooth layer, and optionally at least one layer-by-layer tooth neck layer, in particular each being available independently in a layer-by-layer material build-up process.

[0051] Furthermore, it is preferred that the inner tooth region is produced using a layer-by-layer material build-up process, wherein the layer thickness is from 5 micrometers to 1 millimeter, in particular from 5 micrometers to 1 millimeter, preferably from 10 micrometers to 500 millimeters, more preferably from 10 to 500 micrometers, alternatively from 10 micrometers to 10 micrometers or from 10 to 50 micrometers. Preferably, there is at least one layer-by-layer inner tooth region or at least one tooth layer.

[0052] It is also preferred, according to an alternative, that the at least one inner tooth region, the at least one tooth layer, and optionally at least one tooth neck layer are produced in a single molding process. In a first embodiment, the at least one tooth layer can be placed in the mold, and the at least one inner region is cast onto the tooth layer and polymerized using a molding process. In an alternative embodiment, the at least one tooth layer and optionally at least one tooth neck layer can be obtained around the at least one inner tooth region. This can be done by overmolding or insert molding. Preferably, at least one first component is surrounded by at least two remaining first components (overmolding), in particular embedded, or at least one first component is surrounded by at least one remaining first component (insert molding).A casting process is preferred, particularly an overmolding process and / or an insert molding process, in which the at least one tooth layer, and optionally at least one cervical layer around the at least one inner tooth region, is obtained. Preferably, the remaining component of the first component, in particular the at least one inner tooth region and / or the at least one tooth layer, and optionally at least one cervical layer, is available or consists of a hardened and / or polymerized composition, in particular a dental composite, composition A or composition B, or a mixture comprising at least two of the aforementioned compositions, preferably obtainable by polymerization of the composition.

[0053] According to a further alternative, it is preferred if a) the at least one inner tooth region optionally has on its surface, in particular the surface facing the tooth layer and / or cervical layer, in particular the inner surface of the tooth layer and / or the inner surface of the cervical layer, which faces the surface of the inner tooth region, at least one or more elevations, in particular a bead, rib, pin, partial to complete parting line and / or polyhedral shaped body, or retentions, in particular undercuts or depressions with undercuts, and / or

[0054] b) the at least one tooth layer and / or the at least one cervical layer, each independently on their respective inner surface facing the inner tooth area, in particular the surface of the inner tooth area, in particular in the area of ​​the crown of the inner tooth area, in particular the dentin core, in particular in the dental layered prosthesis, in particular of the tooth,

[0055] at least one or more raised features, in particular ridges, ribs, pins, partial to complete separation joints and / or polyhedral shapes, or retentions, in particular undercuts or depressions with undercuts, and / or c) which has at least one tooth layer, independently on its outer and / or inner tooth layer or on an inner surface facing at least one tooth neck layer, in particular in the dental layered prosthesis, at least one or more raised features, in particular ridges, ribs, pins, partial to complete separation joints and / or polyhedral shapes, or retentions, in particular undercuts or depressions with undercuts, and / or

[0056] d) The at least one cervical layer, each independently on its respective inner surface facing an outer and / or inner cervical layer or inner tooth layer, particularly in a layered dental prosthesis, has at least one or more elevations, in particular ridges, ribs, pins, partial to complete separation joints and / or polyhedral features, or retentions, in particular undercuts or depressions with undercuts. Advantageously on the surface facing the cervical layer or inner tooth layer.

[0057] The aforementioned respective elevations and / or retentions are not located on the subsequent outer surface of the layered prosthesis.

[0058] The aforementioned inner tooth area may in particular have a parting line or a partially to fully circumferential fin suitable for the casting tool of the primary forming process and / or the multi-part casting mold.

[0059] According to a further alternative, it is particularly preferred if a) the at least one inner tooth region, in particular a layered inner tooth region, is surrounded by at least one tooth layer, in particular an enamel layer, preferably a crown, and optionally at least one cervical layer obtainable by a primary forming process, or b) the at least one tooth layer, in particular at least one layered tooth layer, and optionally the at least one cervical layer partially to completely surround at least one inner tooth region, wherein the inner tooth region is obtainable by a primary forming process, or c) the at least one layered inner tooth region and the at least one layered tooth layer partially to completely surrounding the inner tooth region are partially to completely surrounded by at least one cervical layer, in particular an outer tooth layer, preferably an outer layered tooth layer.available by a primary forming process. Particularly preferably means surrounded, encased, especially partially or completely encased. Preferably, the at least one tooth layer, especially an enamel layer, more preferably a tooth crown. According to the invention, a primary forming process does not include processes that form or obtain first components and / or remaining components layer by layer, especially not material-building processes; preferably, a primary forming process includes a casting or compression molding process, especially forming a homogeneous matrix of the respective component.

[0060] Particularly preferred dental layered prostheses comprise, or are in particular selected from, at least one tooth, in particular at least one fixed artificial tooth, prosthesis component and at least one segment of a tooth, inlay, onlay, dental crown, implant crown, two- to multi-unit dental arch, two- to multi-unit dental bridge, in particular comprising suprastructure or approximally, in particular interdentally, connected two to 16 internal tooth regions, and / or dental bridge and / or a blank of the aforementioned prostheses, in particular as a blank of a dental layered prosthesis.The prosthesis may also include, in particular, at least one tooth, a partial or complete dental arch or parts thereof, or the tooth area of ​​a removable two-unit or multi-unit dental bridge, or at least one fixed tooth or dental arch in a partial or complete denture, or at least one implant-supported tooth, or at least one fixed tooth, partial or complete dental arch, or parts thereof in partial or complete dentures. Prostheses may also include screw channels, optionally with screw seats, whereby the screw channel may be straight or angled. Advantageously, 2 to 15 prefabricated screw channels are provided in prefabricated layered dental prostheses, in particular in artificial teeth and / or two-unit or multi-unit dental arches.

[0061] The invention may also relate to the use of layered dental prostheses for the manufacture of dental prostheses that are placed on implants, abutments, or teeth, for the manufacture of partial or complete dentures. The layered dental prosthesis, in particular as a partial or complete denture or as a single tooth, can preferably be arranged supracrestally on an implant or an implant abutment.

[0062] The invention may also relate to a layered dental prosthesis, wherein i) the inner tooth region comprises a dentin core and a tooth neck, in particular a tooth neck designed as an abutment, or ii) an abutment is arranged cervically or radicularly on the inner tooth region as a second component, in particular formed integrally with the inner tooth region. Thus, the layered dental prosthesis may include an abutment as a second component. Preferably, the second component is integrally connected to the first component or the remaining component of the first component. They may form the layered dental prosthesis. Alternatively, the second component may be connected to the aforementioned component(s) by a material-fit, force-fit, or positive-fit connection.The second component, in particular the abutment, can have an implant connection geometry that is specifically designed radicularly in or below the cervical region, preferably in the supracrestal. Alternatively, at least one cervical layer can optionally surround the inner tooth area partially or completely, particularly in the cervical region, preferably if the inner tooth area comprises a dentin core and a tooth neck or an abutment. An abutment is typically a superstructure or attachment element that is positioned between a dental prosthesis, such as a layered dental prosthesis, preferably a crown, and an implant post.

[0063] It is particularly preferred if the a) component, in particular the first component, and / or the b) component, in particular the remaining component of the first component, and / or the c) second component are formed or comprise or consist of a hardened and / or polymerized composition obtainable by hardening and / or polymerizing a hardenable and / or polymerizable composition, in particular the compositions described below.

[0064] The invention may also relate to the use of layered prostheses for the production of superstructures or superconstructions, implant-supported bridges, dental prostheses, etc. Tooth segments are defined as components of the aforementioned teeth or dental arches.

[0065] A primary forming process is preferably a casting process, in particular compression molding or injection molding, preferably comprising or selected from prefilling the open mold and closing the mold, feeding into the closed mold, or overmolding, in particular as a multi-stage injection molding process in which at least two components are cast on top of each other, or insert molding, in particular in which a secondary part, in particular the remaining component, is formed around an inserted substrate, in particular a first component. In casting processes, substantially homogeneous matrices of the remaining components of the first components are obtained, or these components have a substantially homogeneous matrix. In a material-building process, the at least one component, in particular the first component, is produced or is obtainable, in particular from polymer-containing compositions.The material-building processes include layer-by-layer material-building processes, in particular comprising a) melting or sintering of compositions containing polymer and / or wax and / or b) hardening or polymerizing of compositions containing monomer and optionally polymer(s), in particular including 3D printing processes with liquid hardenable and / or polymerizable compositions and / or 3D printing of compositions comprising liquid monomer.

[0066] The invention may also relate to a method for manufacturing at least one layered dental prosthesis, as well as layered dental prostheses obtainable according to the method, comprising at least one inner tooth region and at least one tooth layer partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, in particular as components of the prosthesis.

[0067] comprehensive the steps

[0068] - Providing at least one inner tooth region obtainable or manufactured using a material build-up process and / or at least one tooth layer obtainable or manufactured using a material build-up process and optionally at least one cervical tooth layer obtainable or manufactured using a material build-up process, in particular as components, in particular as first components,

[0069] - Providing a multi-part mold comprising at least one cavity for the production of the at least one layered dental prosthesis, wherein the multi-part mold is designed to be at least two-part and comprises at least one cavity, in particular as a mold comprising a cavity A-side of the mold and cavity B-side of the mold, which preferably form at least one common cavity, - Positioning the at least one inner tooth region obtainable or obtained by a material build-up process and / or the at least one manufactured tooth layer obtainable by a material build-up process and optionally the at least one manufactured cervical layer obtainable by a material build-up process in the opened multi-part mold, in particular in the opened two-part mold, in particular comprising the at least one cavity,preferably the open mold comprising a cavity A-side of the mold and cavity B-side of the mold, each forming at least one common cavity, closing the multi-part mold, in particular forming the cavity of the multi-part mold, and in particular comprising the positioned at least one inner tooth region obtainable or produced by a material build-up process and / or the at least one tooth layer obtainable or produced by a material build-up process and optionally the at least one tooth neck layer obtainable or produced by a material build-up process, in particular as component(s),

[0070] - Feeding a hardenable and / or polymerizable composition into the at least one cavity of the multi-part casting mold, in particular the closed casting mold, and optionally

[0071] - Hardening and / or polymerizing the composition in the at least one cavity of the multi-part casting mold, in particular the closed casting mold, preferably under overpressure and optionally at elevated temperature, and optionally

[0072] Retention of at least one dental layered prosthesis or an intermediate product of the layered prosthesis.

[0073] The at least one inner tooth area and / or optionally tooth neck layer can comprise a hardened or polymerized composition, in particular composition A, B, C and / or D, preferably comprising 0 to 50 wt.%, in particular 5 to 35 wt.%, preferably 5 to 20 wt.% inorganic filler component or fillers.

[0074] The at least one tooth layer and optionally at least one tooth neck layer obtainable and / or optionally produced in a material-building process can comprise a hardened or polymerized composition, in particular composition A and / or B, preferably comprising 30 to 90 wt.%, in particular 40 to 80 wt.%, of inorganic filler component or fillers.

[0075] Preferably, a hardenable and / or polymerizable composition, in particular composition A, B or a mixture thereof, is added, in particular comprising 30 to 90 wt.%, in particular 40 to 80 wt.%, inorganic filler component or fillers.

[0076] In the positioning step, at least one cervical layer is preferably positioned in the opened mold, particularly in the cavity. If the mold comprises multiple cavities, an equal number of cervical layers can be positioned in this opened mold, one cervical layer in each cavity. At least one fewer component than is required to form the layered dental prosthesis is positioned in the respective cavity of the opened mold, thus enabling the step of adding a curable and / or polymerizable composition, particularly for the formation of a component, especially the remaining component of the first component. Preferably, in the positioning step, at least one cervical layer, particularly a cervical layer obtainable by a material build-up process, is positioned in the respective cavity.Two or more cervical layers can be positioned within the cavity. Alternatively, an inner tooth area, particularly one with positioning aids, can be positioned within the cavity to subsequently create at least one cervical layer around the inner tooth area by adding a hardenable and / or polymerizable composition. The fabrication of layered dental prostheses also includes the use of various molds, which, for example, allow the fabrication of an additional tooth layer and / or cervical layer on an intermediate product of a layered dental prosthesis.

[0077] In preferred alternatives, the process can be carried out comprehensively with the following steps, in particular after the provision of the multi-part casting mold.

[0078] A) Positioning the at least one inner tooth area obtainable by a material build-up process and / or the at least one tooth layer obtainable by a material build-up process and optionally the at least one neck layer obtainable by a material build-up process in the opened multi-part casting mold, in particular the at least one tooth layer

[0079] a) - Closing the multi-part mold, in particular forming the cavity of the multi-part mold,

[0080] - Adding a hardenable and / or polymerizable composition into at least one cavity of the multi-part casting mold, or

[0081] b) - Adding a hardenable and / or polymerizable composition to the opened multi-part mold, in particular placing an excess amount of the hardenable and / or polymerizable composition in the mold,

[0082] - Closing the multi-part mold, in particular forming the cavity of the multi-part mold, or B) adding a hardenable and / or polymerizable composition to the opened multi-part mold, in particular placing an excess amount of the hardenable and / or polymerizable composition in the mold,

[0083] - Positioning the at least one inner tooth area obtainable in a material build-up process and / or the at least one tooth layer obtainable in a material build-up process and optionally the at least one tooth neck layer obtainable in a material build-up process in the opened multi-part casting mold, in particular the at least one tooth layer,

[0084] - Closing the multi-part mold, in particular forming the cavity of the multi-part mold,

[0085] Advantageously, a

[0086] - Hardening and / or polymerizing of the composition in the at least one cavity of the multi-part casting mold,

[0087] Retention of at least one dental layered prosthesis or an intermediate product of the layered prosthesis.

[0088] Optionally, after hardening and / or polymerization in the at least one mold, particularly a multi-part mold, at least one surface treatment step, particularly at least one polishing and / or coating step, can be performed. The hardened composition, particularly comprising one or more components, preferably the dental layered prosthesis or intermediate product of the layered prosthesis, is removed from the multi-part mold, and the surface treatment step is then carried out. For example, a varnish and / or gloss layer can be applied in the coating step. Advantageously, the dental layered prosthesis, particularly as the final product, is obtained after the surface treatment step.

[0089] The hardening and / or polymerization of autopolymerizable compositions can occur spontaneously, particularly after a predefined time. For thermally hardening and / or polymerizable compositions, it occurs in the presence of elevated temperature. Specifically, the hardening and / or polymerization takes place at a temperature between 60 and 170 °C, particularly between 85 and 160 °C, and preferably at a pressure, particularly overpressure, of 5 to 50 MPa, particularly between 5 and 25 MPa, which is preferably applied externally to the mold, particularly for 3 to 60 minutes. An intermediate product of a layered dental prosthesis is defined as an arrangement comprising at least one inner tooth region and at least one of at least two tooth layers partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, particularly as components.An alternative intermediate product comprises at least one fewer component, in particular at least one fewer initial component and / or at least one fewer remaining component, than the dental layered prosthesis, especially as a finished product. A dental layered prosthesis can be in the form of a finished product or a blank if further processing by means of surface treatment is to be carried out, such as milling, coating, and / or polishing of the surface.The apical, in particular for the individual preservation of the connection geometry of the prosthesis on the cervical to radicular side of the prosthesis, as of teeth, and / or occlusal material-removing processing of the dental layered prosthesis, in particular for individual adaptation to patients, is preferably considered an adapting processing by the dental technician on the final product of the dental layered prosthesis and is, in particular as individual adaptation to the patient, not the subject of the invention.

[0090] The invention also relates to at least one intermediate product of a dental layered prosthesis, in particular a dental layered prosthesis comprising at least two tooth layers, especially as components, wherein the intermediate product a) is obtainable in a method according to the invention, and / or

[0091] b) for the preservation of the dental layered prosthesis, comprising at least one inner tooth region and at least two tooth layers partially or completely surrounding the inner tooth region, and optionally at least one cervical layer as components, wherein at least one component, in particular the first component, selected from the at least one inner tooth region, the at least one tooth layer, and optionally at least one cervical layer, is each independently obtainable in a material build-up process, and at least one component, in particular the remaining component of the first components, is obtainable in a primary forming process, wherein in a) and / or b) at least one outermost tooth layer, in particular the at least one or at least two tooth layers partially or completely surrounding the inner tooth region, is not present and must be applied, in particular to form the dental layered prosthesis.In a preferred embodiment, the at least two tooth layers can replicate a dentin layer and / or an enamel layer on the layered prosthesis.According to a preferred embodiment, the at least one cavity has the negative 3D geometry of the 3D geometry, in particular the outer geometry or an outer geometry less at least one tooth layer and optionally at least one cervical layer, a) of a layered dental prosthesis comprising at least one inner tooth region and at least one, in particular at least two, tooth layers partially or completely surrounding the inner tooth region, and optionally at least one cervical layer, or b) of a layered dental prosthesis comprising at least two approximately connected inner tooth regions and at least two or more than two tooth layers partially or completely surrounding the inner tooth region, in particular two to ten, and optionally at least one or more than two cervical layers, optionally up to ten cervical layers, or c) of an intermediate product of a layered dental prosthesis according to a) or b).Preferably, the at least one cavity corresponds to the negative 3D geometry of a 3D shaped body of a dental layered prosthesis or an intermediate product.

[0092] The cavity preferably has the negative 3D geometry of the 3D geometry, in particular the outer geometry,

[0093] a) comprising at least one dental layered prosthesis, in particular selected from at least one tooth, prosthetic component and at least one segment of a tooth, inlay, onlay, crown, two- to multi-unit dental arch and / or two- to multi-unit dental bridge or b) comprising at least one intermediate product of a dental layered prosthesis comprising at least one tooth, prosthetic component and at least one segment of a tooth, inlay, onlay, crown, two- to multi-unit dental arch and / or two- to multi-unit dental bridge.

[0094] The invention also relates to a selection of multi-part molds for producing a first tooth layer surrounding the inner tooth area, or a mold for producing a second tooth layer surrounding a first tooth layer and an inner tooth area, etc. Advantageously, the multi-part mold can be a two-plate mold, in particular a family mold, advantageously comprising at least one gate, sprue, and / or vent. The sprue is preferably located in the parting surface of the multi-part mold. Preferably, it is a mold, in particular a casting and / or compression mold, with a straight retraction. The respective cavity of a multi-part mold preferably has a circumferential sealing edge, in particular with a sealing surface, preferably in the form of a draft angle for positioning and / or sealing.The sealing edge may include recesses, in particular one, two, or a plurality of recesses, into which protrusions of the inner tooth area and / or protrusions of at least one tooth layer and / or at least one tooth neck layer can be positioned. These recesses, in interaction with the respective protrusions, can serve to align and / or position the respective first or remaining components.

[0095] A preferred multi-part mold, particularly for carrying out a method according to the invention, for producing at least one layered dental prosthesis or an intermediate product, particularly comprising at least one inner tooth region and / or optionally at least one tooth layer and / or optionally a tooth neck layer, wherein the mold comprises one or more cavities, in particular two or more cavities, with a circumferential sealing edge around the respective cavity, in particular wherein the respective sealing edge is adapted by having at least one recess for positioning and / or aligning, in particular a first component, and for casting at least one remaining component of the first component. The multi-part mold is preferably a multi-cavity mold having more than one cavity with the same geometry.Alternatively, the mold can be a family tool that allows for different cavities to be used to produce different residual components. The mold preferably comprises two interlocking mold halves, in particular A-side and B-side, preferably forming the mold core. The mold advantageously features vents, particularly at the forming surface or above an ejector pin channel. Furthermore, the mold can be designed as a stackable mold or a multi-shot mold. Typically, cavity A-side is referred to as the stationary side and cavity B-side as the moving side of the mold; often, B-side includes an ejector system and optionally a insert holder mechanism.

[0096] In particular, the mold includes at least one sprue and optionally at least one sprue. Advantageously, the multi-part mold includes one sprue and optionally one sprue per cavity. Alternatively, the sealing edge of at least one cavity is synonymous with a cavity, designed as a parting line to form a separation joint at an inner tooth area, a tooth layer, and / or a tooth neck layer.

[0097] Also part of the invention is a computer program product comprising instructions which, when executed by a computer, in particular a computer of a device for carrying out a material-building process and / or a computer of a device for carrying out a primary forming process, in particular a computer of a device for carrying out a casting process,

[0098] This or this causes at least one dental layered prosthesis to be produced from at least one virtual dental layered prosthesis, comprising at least one virtual inner tooth area and at least one virtual tooth layer partially or completely surrounding the inner tooth area, and optionally at least one virtual cervical layer, or a virtual intermediate thereof, preferably semi-automatically and / or fully automatically, particularly preferably

[0099] by

[0100] - at least one component, in particular a first component, selected from the at least one inner tooth area, which comprises at least one tooth layer, and optionally at least one neck layer, each produced independently in a material build-up process, in particular a layer-by-layer material build-up process, and

[0101] - at least one component, in particular the remaining component of the first components, is manufactured in a primary forming process, in particular a casting or compression molding process,

[0102] wherein at least one dental layered prosthesis is obtained. In particular, in the primary forming process, the at least one component is partially or completely surrounded by another component, and especially the first component is partially or completely surrounded, preferably encased, by at least one remaining component of the first component, thus advantageously forming the dental layered prosthesis. The manufactured prostheses are then real prostheses. The same applies to the first components and the remaining components of the first components.

[0103] Also part of the invention is a data carrier signal that transmits the computer program product.

[0104] The invention also relates to a virtual dental layered prosthesis, in particular in the form of a data set or 3D data model of the dental virtual layered prosthesis, as a 3D file for a device for carrying out a material build-up process, in particular a 3D machine for carrying out a material build-up process, and / or for a device for carrying out a primary forming process, in particular a machine for carrying out a primary forming process, in particular a casting process, comprising at least one virtual dental layered prosthesis, comprising at least one virtual inner tooth area and at least one virtual tooth layer partially or completely surrounding the inner tooth area, and optionally at least one virtual cervical layer and optionally at least one virtual intermediate product for manufacturing the dental layered prosthesis.The data set includes geometry data for carrying out the material build-up process and / or the primary forming process, advantageously including at least one AMF or STL file for carrying out the material build-up processes and at least one STEP file for the primary forming process, in particular casting processes.

[0105] The invention also relates to the use of a blank of a layered dental prosthesis, or a layered dental prosthesis, or a layered dental prosthesis obtainable according to the method, in particular a blank of a layered dental prosthesis, for the manufacture of a surface-treated, in particular coated and / or polished, layered dental prosthesis, in particular as a finished product, comprising, in particular selected from, at least one tooth, dental prosthesis component and at least one segment of a tooth, inlay, onlay, crown, two- or multi-unit dental arch and / or two- or multi-unit dental bridge and / or a blank of the aforementioned prostheses or for the manufacture of a partial or complete denture, a bridge and / or a superstructure. Advantageously, a layered prosthesis, in particular as a finished product, comprises a coating, such as a varnish and / or gloss layer.A preferred layered prosthesis has a glossy surface.

[0106] The invention may also relate to the use of a virtual dental layered prosthesis for the production of a surface-treated, in particular polished and / or coated, dental layered prosthesis comprising at least one tooth, prosthetic component and at least one segment of a tooth, inlay, onlay, crown, two- or multi-unit dental arch and / or two- or multi-unit dental bridge and / or a blank of the aforementioned prostheses, or for the production of a partial or complete denture, a bridge and / or a superstructure. Preferably, a virtual dental layered prosthesis may have at least one virtual screw channel and preferably the respective aforementioned virtual components of the virtual prosthesis.

[0107] Preferred embodiments of suitable material-building processes for producing the first components according to the invention are mentioned below.

[0108] Alternatively, i) the inner tooth area and / or ii) the at least one tooth layer and / or iii) the at least one cervical layer can be produced or is available in a material build-up process comprising a) a layer-by-layer material build-up process comprising melting or sintering of polymer and / or wax-containing compositions, and / or b) a layer-by-layer material build-up process comprising hardening or polymerizing of monomer-containing compositions.

[0109] According to another alternative, i) the inner tooth area and / or ii) the at least one tooth layer and / or iii) the at least one cervical layer can be produced in a material build-up process, in particular from polymer-containing compositions, which includes a layer-by-layer material build-up process (additive layer manufacturing, 3D printing process), in particular a) by layer-by-layer material build-up process comprising melting or sintering of polymer and / or wax-containing compositions, in particular comprising fused deposition processes such as fused deposition modeling (FDM), selective laser sintering (SLS), selective laser melting, electron beam melting (EBM / EBAM), electron beam additive manufacturing (MJF), and sheet lamination.Powder Bed Fusion (PDF) and / or Fused Filament Fabrication (FFF), and / or, in particular, b) by a layer-by-layer material build-up process comprising hardening or polymerizing monomer-containing compositions, such as, in particular, 3D printing with liquid compositions, preferably 3D printing of liquid monomer and optionally polymer-comprising compositions, preferably, in particular, comprising stereolithography (STL, SLA), digital light processing (DLP), multi-jet modeling (MJM), PolyJet processes, film transfer imaging (FTI) processes, and / or laminated object modeling (LOM), and / or 3D printing with powder (3DP), wherein, preferably, in a material build-up process, at least one inner tooth region and / or at least one tooth layer are produced. In the material build-up processes, typically only layers a few micrometers thick, preferably with layer thicknesses of 5 to 50 micrometers, are additively built up.

[0110] The dental layered prosthesis can comprise at least two or three tooth layers, which include at least one enamel layer (cutting layer) and / or at least one dentin layer and optionally at least one fluorescent tooth layer between an enamel and a dentin layer.

[0111] Furthermore, the layered dental prosthesis can comprise a crown and, optionally, a neck, which is attached in a single piece of material, particularly below the crown. The neck is preferably located above the alveolar ridge in the gingiva, i.e., cervically, with the crown adjoining the neck above the gingiva when the prosthesis is mounted on an implant or on an abutment on an implant. Likewise, the layered dental prosthesis can comprise a crown, including at least one inner tooth region and at least one tooth layer that partially or completely surrounds the crown, particularly a tooth layer that completely surrounds the crown.

[0112] A preferred dental layered prosthesis comprises, in particular, a region of the tooth neck below the crown, encompassing at least one inner region of the tooth neck and at least one tooth layer partially or completely surrounding the inner region of the tooth neck, preferably a tooth layer completely surrounding the inner region of the tooth neck, which preferably tapers towards the lower region of the tooth neck. Preferably, the layer is thinner in the radicular direction than in the upper region of the tooth neck towards the crown. The tooth crown (Latin: corona dentis) is understood to be the part of a tooth that protrudes from the gum and is covered with enamel. The cervical layer can be located in the cervical region, where the enamel tapers, particularly towards the root, and is therefore thinnest.

[0113] The inventive method allows for the creation of particularly natural-looking teeth, especially artificial teeth. It also advantageously allows for a more realistic reproduction of the transition between the crown and root of the tooth, i.e., the neck of the tooth. This is because the neck of the tooth does not run as a straight line, but rather in a garland-like shape, extending furthest towards the crown at the point of contact with the adjacent tooth (approximal). This is more pronounced in the front teeth (incisors and canines) than in the molars.

[0114] According to the invention, dental layered prostheses comprise at least one tooth or several teeth and / or dental arch and / or dental arches and the at least one tooth layer advantageously has, in particular interdentally, at least one tooth layer that extends less towards the root of the tooth than in the non-approximal area.

[0115] According to the invention, the at least one component, in particular a first component, particularly obtainable in a material-building process, and / or at least one component, in particular a remaining first component of the first components, particularly obtainable in a primary forming process, such as casting processes, may consist of or comprise a hardened and / or polymerized composition obtainable by hardening and / or polymerizing the disclosed hardenable and / or polymerizable composition(s).

[0116] Preferably, at least one inner tooth region and / or at least one tooth layer and / or optionally at least one cervical layer comprise or consist of, in particular as at least one component, especially first components and / or the at least one remaining component of the first components, of a hardened and / or polymerized composition, in particular a polymerized dental composite material, a polymerized composition A and / or polymerized composition B, or mixtures comprising at least two of the aforementioned compositions. Advantageously, each tooth layer comprises or consists independently of one of the aforementioned polymerized compositions with a higher content of inorganic fillers, in particular at least 5 wt.% higher, than the inner tooth region and / or a cervical layer.

[0117] Preferably, the hardened and / or polymerized composition, in particular the dental composite material, composition A and / or B, of the at least one inner tooth area and / or at least one tooth layer and / or optionally at least one cervical layer, particularly as at least one first component, differ from the hardened and / or polymerized composition of the at least one inner tooth area and / or at least one tooth layer and / or optionally at least one cervical layer of the at least one remaining component of the first component, in particular the content of at least one inorganic filler in the at least one remaining component of the first component, particularly obtainable in a primary forming process, such as casting or compression molding, is at least 1 wt.%, in particular greater than or equal to 5 wt.%, preferably greater than or equal to 10 wt.% or greater than or equal to 15 wt.%, particularly preferably greater than or equal to 20 wt.%.-% higher than in the at least one first component that is available in a material-building process.

[0118] According to a particularly preferred alternative, the at least one inner tooth region and the at least one tooth layer, and optionally the at least one cervical layer, differ in that the at least one tooth layer and optionally the at least one cervical layer have a content of at least one inorganic filler that is at least 5 wt.% higher than that of the at least one inner tooth region, in particular greater than or equal to 7.5 wt.%, preferably greater than or equal to 10 wt.%, particularly preferably greater than or equal to 15 wt.%, preferably greater than or equal to 20 wt.%. A particularly preferred hardenable and / or polymerizable composition comprises a polymerizable dental composite material comprising (i) 30 to 85 wt.%, in particular 40 to 80 wt.% or 50 to 70 wt.%, preferably 70 to 85 wt.%, of at least one inorganic filler comprising at least one dental glass and optionally at least one amorphous metal oxide, (ii) 10 to 30 wt.%.(iii) at least one urethane(meth)acrylate, in particular a mixture of at least two different urethane(meth)acrylates, in particular di- to deca-functional urethane(meth)acrylate(s), (iii) optionally 0.01 to 5 wt.% at least one di-, tri-, tetra- or multi-functional monomer that is not a urethane(meth)acrylate, optionally a mono-functional monomer comprising an (alkyl) acrylate, acrylate or a mixture thereof, and (iv) 0.01 to 10 wt.% at least one initiator, an initiator system, polymer fragments, and optionally stabilizers and optionally pigments, wherein the total composition of the composite material is 100 wt.%. Alternatively, the invention comprises the composition obtainable by polymerization and / or curing. Preferably, each of the aforementioned compositions may alternatively or additionally comprise, as (iii) or (g), optionally at least one mono-functional monomer comprising an (alkyl) acrylate, acrylate or a mixture thereof.An (alkyl)acrylate and / or acrylate may comprise C1 to C4 alkyl as well as ethers and / or esters thereof.

[0119] The hardenable and / or polymerizable composition(s), polymer-containing composition(s) and / or compositions containing at least one monomer are preferably each independently usable in a primary forming process, in particular compression molding or casting, and / or in a material-building process.

[0120] Compositions for material build-up processes typically include UV and / or Vis initiator systems, and compositions for primary forming processes typically include thermal and / or autocatalytic initiator systems or initiators.

[0121] The invention also relates to a hardenable and / or polymerizable composition, in particular a polymerizable dental composite material, especially a thermally or radiation-curable polymerizable composite material, comprising

[0122] (i) a) greater than or equal to 30 to 85 wt.%, in particular 40 to 85 wt.%, preferably 50 to 70 wt.% of at least one inorganic filler comprising at least one dental glass of a mean particle size dso of 0.7 to 7.5 .m, in particular 0.7 .m to 5.5 .m, preferably 0.8 .m to 5.5 .m, and optionally at least one amorphous metal oxide, in particular for the production of tooth layers, or

[0123] b) comprising 5 to 25 wt.%, in particular 5 to 20 wt.% of at least an inorganic filler comprising at least one dental glass of a mean particle size dso of 0.7 to 7.5 .m, in particular of 0.7 .m to 5.5 .m, preferably of 0.8 .m to 5.5 .m, and optionally at least one amorphous metal oxide, in particular for the production of the inner tooth area and / or cervical layer,

[0124] (ii) 10 to 95 wt.%, in particular of a) 10 to 60 wt.% or b) 75 to 90 wt.%, of at least one urethane(meth)acrylate, in particular a mixture of at least two different urethane(meth)acrylates, preferably a mixture of at least three different urethane(meth)acrylates, in particular of mono-functional and / or di- to deca-functional urethane(meth)acrylates, preferably a mixture of mono- and di- to deca-functional urethane(meth)acrylates,

[0125] (iii) optionally 0.01 to 5 wt% of at least one di-, tri-, tetra- or multi-functional monomer that is not a urethane (meth)acrylate,

[0126] (iv) 0.01 to 10 wt.% of at least one initiator, one initiator system, and optionally at least one stabilizer and optionally at least one pigment, wherein in particular the at least one pigment comprises both fluorescent and color pigments, wherein the total composition of the composite material is 100 wt.%. According to an alternative, the invention comprises the composite material obtainable by polymerization.

[0127] In one embodiment, it is preferred that the composite material be thermally polymerizable and additionally photochemically polymerizable. For the purposes of this invention, a thermally polymerizable composite material is understood to be one that can be polymerized at temperatures greater than or equal to 60 to 160 °C, preferably at temperatures greater than or equal to 70 to 150 °C, and particularly preferably at temperatures between 90 and 150 °C. Furthermore, according to the invention, it is preferred that the volume shrinkage be less than or equal to 1.5%.

[0128] The di- to deca-functional urethane(meth)acrylates are used as monomers and do not contain peroxy groups.

[0129] According to a particularly preferred embodiment, especially for the production of tooth-colored layers, the dental composite material (ii) comprises 10 to 30 wt.% of a mixture of at least two different urethane(meth)acrylates, preferably of three different urethane(meth)acrylates, comprising at least one difunctional urethane(meth)acrylate with a bivalent alicyclic group and one difunctional urethane(meth)acrylate with a bivalent alkylene group, and optionally at least one monofunctional urethane(meth)acrylate and / or at least one tetrafunctional dendritic urethane(meth)acrylate, preferably at least one hexafunctional dendritic urethane(meth)acrylate. Preferably, the content of component (iii) is 0.15 to 5 wt.%, particularly preferably 1.0 to 2 wt.%, of a dimethacrylate ester of a polyether, such as preferably a dimethacrylate-polyethylene glycol or dimethacrylate-polypropylene glycol.Particularly preferred are dimethacrylate triethylene glycol (TEGDMA), diethylene glycol dimethacrylate (DEGMA) and dimethacrylate tetraethylene glycol (TEDMA).

[0130] The hardenable and polymerizable compositions, in particular composition A and / or B, for the primary forming process are advantageously thermally polymerizable, radiation-curable and / or autopolymerizable, wherein a polymerized composition, in particular composition A and / or B, is available with a flexural strength of greater than or equal to 200 MPa to 260 MPa (7 days, 23±2°C, dry) and a modulus of elasticity greater than or equal to 15 to 20 GPa (7 days, 23±2°C, dry) according to EN ISO 6872:2008, in particular with a flexural strength of greater than or equal to 210 MPa, preferably greater than or equal to 220 MPa and a modulus of elasticity of greater than or equal to 16 to 20 GPa, preferably greater than or equal to 17 GPa to 20 GPa, more preferably 18 to 20 GPa.

[0131] A particularly preferred hardenable and polymerizable composition, especially as composition A, as well as a polymerized composition obtainable by polymerization of composition A, comprising

[0132] (a) 1 to 90 wt.%, in particular 20 to 30 wt.%, of at least one difunctional urethane(meth)acrylate,

[0133] (b) optionally 1 to 50 wt.%, in particular 20 to 30 wt.%, of at least one monofunctional acrylate with an alicyclic group and / or at least one monofunctional methacrylate with an alicyclic group, and

[0134] (c) 0.01 to 10 wt.% minimum initiator, in particular a thermal initiator and / or a photoinitiator for the UV and / or Vis range or a photoinitiator system for the UV and / or Vis range,

[0135] (d) optionally 1 to 50 wt.% of at least one acrylic acid ester with an additional carboxy group

[0136] (e) optionally 1 to 25 wt% of at least one disubstituted 4,4'-di(oxabenzene)-dialkylmethane of formula I

[0137]

[0138] includes R 1 and R 2 each methyl and R 5 and R 6 equal and selected from H, Methyl and Ethyl, in particular with R 5 and R 6 equal and selected from H and Methyl, and with R 3 and R 4 each independently bivalent ethylene or propylene with n = 0 to 6 and m = 0 to 6, in particular n = 1 to 6, preferably n = 2 to 4, and with m = 1 to 6, preferably m = 2 to 4, preferably with n = 2 and m = 2 or with n = 4 and m = 4 as well as mixtures thereof, in particular n = 1 and m = 1 and / or n + m = 2,

[0139] (f) 5 to 89.9 wt.%, in particular 5 to 55 wt.% or 40 to 85 wt.%, in particular

[0140] i) 30 to 89.9 wt.%, in particular 30 to 80 wt.% or 40 to 70 wt.%, in particular for the manufacture of at least one tooth shell, or

[0141] ii) 5 to 25 wt.%, in particular for the production of at least one inner tooth area and / or at least one cervical layer,

[0142] Inorganic fillers comprising inorganic oxides or inorganic mixed oxides and / or dental glasses, in particular silicon dioxide, zirconium dioxide, mixed oxides with silicon dioxide and zirconium dioxide, preferred fillers comprising silicon dioxide and / or mixed oxides of a metal oxide and silicon dioxide, (g) 0 to 10 wt.%, in particular 1 to 10 wt.% alkylene dimethacrylate and / or alkylene diacrylate, preferably with alkylene dimethacrylate, preferably each independently with alkylenes C1 to C12 alkylenes, preferably C1 to C4 alkylenes, particularly preferably ethylene glycol dimethacrylate, and

[0143] (h) optionally 0.1 to 5 wt.%, in particular 0.1 to 2 wt.% hydroxyethyl acrylate, (i) optionally 0.1 to 5 wt.% polymer fragments comprising polymerized diol(meth)acrylate, in particular polydecane-1,12-diol methacrylate, and olefinically functionalized silanized pyrogenic silica, preferably methacrylate silane-functionalized, in particular having a mean particle size Dso of 2 to 3 .m,

[0144] the total composition is 100% by weight.

[0145] In particular, a tooth layer comprises a correspondingly polymerized composition with (f) i) 30 to 89.9 wt.%, in particular 30 to 80 wt.% or 40 to 70 wt.%, and / or at least one inner tooth area and / or a tooth neck layer comprises a correspondingly polymerized composition with (f) ii) 5 to 25 wt.%, preferably 5 to 20 wt.%, in particular for the production of at least one inner tooth area and / or at least one tooth neck layer.

[0146] A particularly preferred alternative hardenable and / or polymerizable composition, especially as composition A, as well as a polymerized composition obtainable by polymerization of composition A, may comprise

[0147] (a) 10 to 70 wt.%, preferably 20 to 35 wt.% of at least one at least difunctional urethane(meth)acrylate, in particular IIDMA, thiourethane(meth)acrylate and / or mixtures comprising these,

[0148] (b) optionally 10 to 30 wt.%, preferably 20 to 30 wt.% of at least one monofunctional acrylate with an alicyclic group and / or at least one monofunctional methacrylate with an alicyclic group, preferably dicyclopentanyl methyl acrylate, and

[0149] (c) 0.01 to 10 wt.% of at least one initiator system, in particular a thermal initiator system or a photoinitiator for the UV and / or Vis range or a photoinitiator system for the UV and / or Vis range,

[0150] (d) i) 30 to 89.9 wt.%, in particular 30 to 80 wt.% or 40 to 70 wt.%, in particular for the manufacture of at least one tooth shell, or

[0151] ii) 5 to 25 wt.%, in particular for the production of at least one inner tooth area and / or at least one cervical layer,

[0152] (e) each independently comprising inorganic fillers comprising inorganic oxides or inorganic mixed oxides and / or dental glasses, in particular silicon dioxide, zirconium dioxide, mixed oxides with silicon dioxide and zirconium dioxide, preferred fillers comprising silicon dioxide and / or mixed oxides of a metal oxide and silicon dioxide, (e) optionally 0.1 to 5 wt.% polymer fragments comprising polymerized diol(meth)acrylate, in particular polydecane-1,12-diol methacrylate, and olefinically functionalized silanized pyrogenic silica, preferably methacrylate-silane functionalized, in particular with a mean particle size Dso of 2 to 3 .m,

[0153] wherein the total composition is 100 wt.%. In particular, a tooth layer comprises a correspondingly polymerized composition with d) i) 30 wt.% to 89.9 wt.%, in particular 30 wt.% to 80 wt.% or 40 wt.% to 70 wt.%, and / or at least one inner tooth area and / or a tooth neck layer comprises a correspondingly polymerized composition with (d) ii) 5 wt.% to 25 wt.%, in particular for the production of at least one inner tooth area and / or at least one tooth neck layer, in each case in relation to the total composition of 100 wt.% of the composition.

[0154] The composition(s) for the prostheses available in material-building processes may preferably have a dynamic viscosity at 23 °C of greater than or equal to 50 mPa*s to 500 mPa*s, preferably of 100 mPa*s to 300 mPa*s, and particularly preferably of 50 mPa*s to 200 mPa*s.

[0155] (d) may preferably comprise a mixture of inorganic fillers and (e) may optionally comprise polymer fragments comprising or selected from:

[0156] (d) 8 to 35 wt.% of a first inorganic methacrylsilane functionalized silicate, in particular a spherical nanosilicate with a mean particle size (Dso) of 60 nm, - 8 to 30 wt.% of feldspar with a mean particle size Dso of 1 to 4 pm, in particular of 3 pm, in particular a methacrylsilane functionalized feldspar flour with a mean particle size (D50) of 3 pm,

[0157] - 0 to 15 wt.%, in particular 0.1 to 15 wt.%, dental glass with a mean particle size of 0.85 pm, in particular a methacrylsilane functionalized barium aluminum fluoride borosilicate glass with a mean particle size (Dso) of 0.5 to 1 pm, preferably of 0.85 pm, - 0 to 5 wt.%, in particular 0.1 to 5 wt.% mixed oxides of zirconium dioxide with silicon dioxide, in particular zirconium silicate, preferably with a mean particle size (Dso) of 2 to 4 pm, preferably around 3.5 pm,

[0158] - 0 to 5 wt.%, in particular 0.1 to 4 wt.% radiopaque ytterbium trifluoride, in particular not surface-modified, preferably with a mean particle size (Dso) of approximately 50 to 150 nm, in particular of 100 nm, optionally + / - 20 nm, and optionally

[0159] (e) 0 to 2 wt.% polymer fragments, in particular polymer fragments comprising or consisting of a polymerized composition of polydodecane-1,12-diol dimethacrylate and methacrylsilane-functionalized pyrogenic silica, in particular having a mean particle size (Dso) of 2 pm to 3 pm, in particular methacrylsilane-functionalized, wherein the total content of the aforementioned (d) inorganic fillers in the total composition of 100 wt.% of the composition is: i) 30 to 89.9 wt.%, in particular in tooth layers, or ii) alternatively 5 to 25 wt.%, in particular in the inner tooth region and / or cervical layer, and in particular the total composition comprising (a) to (e) is 100 wt.%. This general composition, each comprising a proportion or content of the inorganic fillers mentioned under (d), was used to produce the additively manufactured tooth shell or core in the examples (example: additive).The hardenable and / or polymerizable compositions, in particular compositions A and / or B, are preferably radiation-curable, especially by UV and / or Vis radiation. These compositions preferably have a dynamic viscosity at 23 °C of less than or equal to 9000 mPa*s, more preferably less than or equal to 6000 mPa*s, more preferably less than or equal to 3000 mPa*s, more preferably less than or equal to 2000 mPa*s, and more preferably greater than or equal to 10 to less than or equal to 1500 mPa*s. The dynamic viscosity can be determined at 23 °C using a rheometer (Anton Paar, Physicist NCR 301) according to DIN 1342-2; 2003-11 for Newtonian fluids and DIN 1342-3; 2003-11 for non-Newtonian fluids.

[0160] The determination of particle sizes can preferably be carried out by means of laser diffraction, e.g. with a Mastersizer 3000 from Malvern in a wet dispersion process with subsequent particle size determination and particle size distribution by measuring the intensity of the scattered light of the scattered laser beam when passing through the dispersed sample and subsequent software-based evaluation of the scattering pattern using the associated software.

[0161] In a particularly preferred embodiment, a polymerized composition A or B, particularly for use as composition A or B for producing the at least one tooth layer, in particular the enamel layer, and / or the at least one inner region and optionally the at least one cervical layer of the dental prostheses according to the invention, is obtainable by polymerization of the polymerizable composition A or B. Preferably, the at least one tooth layer, in particular the enamel layer, and / or the at least one inner tooth region and optionally the at least one cervical layer, in particular as a first component or as a remaining component, consists of the polymerized composition A or B or a mixture thereof.

[0162] A composition A is further preferred, as is a polymerized composition obtainable by polymerization of composition A, comprising (a) 30 to 70 wt.% at least one difunctional urethane (meth)acrylate, (b) 10 to 40 wt.% at least one monofunctional acrylate with an alicyclic group and / or at least one monofunctional methacrylate with an alicyclic group, (c) 0.01 to 10 wt.% at least one photoinitiator for the UV and / or Vis range or a photoinitiator system for the UV and / or Vis range.

[0163] (d) optionally 3 to 40 wt.%, in particular 5 to 25 wt.%, at least one acrylic acid ester with an additional carboxy group, (e) optionally 1 to 15 wt.%, in particular 2 to 5 wt.%, at least one disubstituted 4,4'-di(oxabenzene)dialkylmethane of formula I

[0164] with R 1 , R 2 , R 5 and R 6 each independently selected from H or C1 to C4 alkyl, and with R3 and R4 each bivalent C1 to C4 alkylenes, with n = 0 to 6 and m = 0 to 6, in particular n = 1 and m = 1 and / or n + m = 2,

[0165] (f) 5 to 59.9 wt.% inorganic fillers comprising inorganic oxides or inorganic mixed oxides and / or dental glasses, in particular silicon dioxide, zirconium dioxide, mixed oxides with silicon dioxide and another metal oxide, such as zirconium dioxide, preferred fillers comprising silicon dioxide and / or mixed oxides with silicon dioxide and another metal oxide,

[0166] (g) 0 to 10 wt.%, in particular 1 to 10 wt.% alkylene dimethacrylate and / or alkylene diacrylate, preferably with alkylene dimethacrylate, preferably each independently with alkylenes C1 to C12-alkylenes, preferably C1 to C4-alkylenes, particularly preferably ethylene glycol dimethacrylate,

[0167] (h) optionally 0.1 to 5 wt.%, in particular 0.1 to 2 wt.% hydroxyethyl acrylate, wherein the total composition is 100 wt.%.

[0168] Particularly preferred difunctional urethane(meth)acrylates with a bivalent alicyclic group comprise or are selected from bis-(4',7'-dioxa-3',8'-dioxo-2'-aza-decyl-9'-enetetrahydrodicyclopentadiene, bis-(4',7'-dioxa-3',8'-dioxo-2'-aza-9'-methyl-decyl-9'-ene)-tetrahydrodicyclopentadiene and / or mixtures thereof, and optionally mixtures of the 3,8- / 3,9- / 4,8- / 3,10- / 4,10-isomers and / or the cis- and trans-isomers of the aforementioned compounds. The difunctional urethane acrylate with a bivalent alicyclic group selected from bis-(4',7'-dioxa-3', 8'-dioxo-2'-aza-decyl-9'-ene tetrahydrodicyclopentadiene, bis-(4',7'-dioxa- 3',8'-dioxo-2'-aza-9'-methyl-decyl-9'-ene)tetrahydrodicyclopentadiene and / or mixtures thereof, as well as optionally mixtures of the 3,8- / 3,9- / 4,8- / 3,10- / 4,10-isomers and / or the cis- and trans-isomers of the aforementioned compounds.

[0169]

[0170] In a preferred embodiment, (a) the at least one difunctional urethane(meth)acrylate is selected from difunctional urethane(meth)acrylates having a bivalent alkylene group.

[0171] The difunctional urethane(meth)acrylate with a bivalent alkylene group is preferably selected from linear or branched urethane dimethacrylates functionalized with a bivalent alkylene group, urethane dimethacrylate-functionalized polyethers with alkylene group(s), such as bis(methacryloxy-2-ethoxycarbonylamino) alkylenes, bis(methacryloxy-2-ethoxycarbonylamino)-substituted polyalkylene ethers, preferably 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane, IIDMA with the alternative name HEMA-TDMI. A bis(methacryloxy-2-ethoxycarbonylamino) alkylene is preferred, wherein the alkylene comprises linear or branched 03 to C20, preferably C3 to C6, such as, most preferably, a methyl-substituted alkylene, such as HEMA-TMDI. The bivalent alkylene preferably comprises 2,2,4-trimethylhexamethylene and / or 2,4,4-trimethylhexamethylene.

[0172] Furthermore, the composition may comprise at least one additional monomer (g), at least one di-, tri-, tetra- or multi-functional monomer, which in particular is not a urethane(meth) acrylate and in particular does not correspond to formula I. Likewise, the composition may comprise one additional mono-functional monomer (h).

[0173] Preferably (d) comprises the at least one acrylic acid ester with an additional carboxy group phthalic acid mono-[2-(methacryloyloxy) ethyl ester], or 2-acryloyloxyethyl hydrogen phthalate, polyether-functionalized acrylic acid esters with a carboxy group and mixtures thereof.

[0174] It is particularly preferred if (b) the at least one monofunctional acrylate with an alicyclic group and / or the at least one monofunctional methacrylate with an alicyclic group comprises at least one monofunctional acrylate with a dicyclopentane group and / or at least one monofunctional methacrylate with a dicyclopentane group, or mixtures containing these. Preferably, the monofunctional acrylate with an alicyclic group comprises at least one monofunctional acrylate with a dicyclopentane group and / or at least one monofunctional methacrylate with a dicyclopentane group, wherein the acrylate has 14 to 25 carbon atoms, in particular 14 to 18 carbon atoms. Dicyclopentanyl methyl acrylate is particularly preferred. A hardenable and / or polymerizable composition, in particular a composition containing polymerizable monomer(s) and optionally polymers, may comprise greater than or equal to 50 wt.% inorganic fillers in the total composition of 100 wt.-%, such as the following polymerizable composition B or the aforementioned composition A, particularly for the production of a tooth layer. For the production of the inner tooth area and / or cervical layer, the content of inorganic fillers is advantageously 5 to 25 wt.% in the total composition of the polymerizable composition.

[0175] An inorganic filler component or inorganic fillers may comprise at least one dental glass with a mean particle size dso of 0.7 to 7.5 .m, preferably approximately 0.85 .m, and optionally at least one amorphous metal oxide.

[0176] Preferred hardenable and / or polymerizable composition, in particular composition B, preferably for use in the process according to the invention or for the production of the at least one remaining component of the first components obtainable in a primary forming process, in particular also a polymerized composition obtainable by polymerization of composition B, preferably comprise

[0177] (i) 30 to 90 wt.%, in particular 50 to 90 wt.% of at least one inorganic filler,

[0178] (ii) 10 to 69.98 wt.%, in particular 49.98 to 69.98 wt.%, comprising at least one urethane acrylate, in particular urethane methacrylates and / or urethane acrylates, in particular wherein one urethane acrylate is at least one urethane acrylate of formula II with a bivalent hydrocarbon group

[0179]

[0180] with A = O when B = NH or A = NH when B = O, in particular the aforementioned compounds with R 1 and R 2 each independently selected from H and alkyl with 1 to 8 C atoms, preferably R 1 = H or CH3, R 2 = H or CH3, R 5 and R 6 each independently selected from linear C2 to C6 alkylene groups or linear C2 to C6 oxyalkylene groups, wherein R 5 and R 6 optionally each independently possess a C1-C3 alkyl group or (met)acryloxymethylene group, preferably CH3 and R 8 a bivalent hydrocarbon group with 6 to 12 carbon atoms, and optionally mixtures of urethane acrylates and / or adducts of these urethane acrylates comprising these, in particular a mixture of urethane acrylates of formula I and optionally isomers thereof,

[0181] (iii) optionally 0.01 to 25 wt% of at least one mono- and / or di-, tri-, tetra- or multifunctional monomer with at least one ether group, thioether group, at least one tri-functional triester, one di-functional diester and / or mono-ester, wherein the diester is selected from tricyclodecanedimethanol dimethacrylate and tricyclodecanedimethanol diacrylate or mixtures comprising at least two of these mono- and / or di-, tri-, tetra- or multi-functional monomers,

[0182] (iv) 0.01 to 10 wt% of at least one initiator, one initiator system and optionally at least one stabilizer and optionally at least one pigment and optionally further additives, wherein the total composition of the polymerizable composition is 100 wt%.

[0183] Inorganic fillers are to be understood synonymously with inorganic filler component. In a particularly preferred embodiment, a polymerized composition B, preferably for use as at least one component, and in particular a remaining component of the first components, is obtainable by polymerization of the polymerizable composition B or is available for obtaining the layered dental prostheses.

[0184] Preferred urethane acrylates of formula II include urethane acrylates of formula Ha

[0185]

[0186] with A = O if B = NH or A = NH if B = O and with R 1 = H or CH3, R 2 = H or CH3, and R 8 a bivalent hydrocarbon group with 6 to 12 carbon atoms, R 11 = each independently H, C1-C3 alkyl groups or (met)acryloxymethylene group, preferably CH3. R preferably comprises 8 one of the following bivalent groups

[0187]

[0188] The following dental glasses are preferably suitable: aluminosilicate glasses or fluoroaluminosilicate glasses, barium aluminum silicate, strontium silicate, strontium borosilicate, lithium silicate and / or lithium aluminum silicate, as well as mixtures of at least two of the aforementioned dental glasses. The particle sizes of the dental glasses are preferably within the specified range. Amorphous spherical fillers based on oxides or mixed oxides, such as amorphous SiO₂, ZrC₂, or mixed oxides of SiO₂ and ZrO₂, particularly with a primary particle size of 2 to 45 nm, can be used as amorphous metal oxides or as mixtures of amorphous metal oxides. The refractive index of the aforementioned inorganic fillers is approximately 1.5.

[0189] According to a preferred embodiment, a composition, in particular a composition A and / or B, comprises, as a dental composite material, at least one dental glass, in particular a radiopaque dental glass, with a mean particle size dso of 0.85 .m and / or 1.2 to 1.7 .m, preferably with a mean particle size of 1.35 to 1.65 .m, in particular with a dso of 1.5 .m, optionally ±0.15 .m, and preferably with a dgg of less than or equal to 10 .m. A dental glass with a mean particle size dso of approximately 0.85 .m, optionally ±0.1 .m, in particular ±0.05 .m, preferably ±0.03 .m, and preferably with a dgg of less than or equal to 10 .m, is particularly preferred. A particularly preferred dental glass comprises barium aluminum borosilicate glass. Furthermore, a barium aluminum silicate glass with a refractive index of n = 1.52 to 1.55, preferably 1.53, is particularly preferred.A particularly preferred particle size distribution can be in the range from d greater than or equal to 0.2 .m to dgg less than or equal to 7.5 .m, preferably with d greater than or equal to 0.4 .m to dgg less than 7.5 .m and a mean diameter dso of 0.7 to 7.5 .m.

[0190] Furthermore, the invention relates to a composition, in particular a composition A and / or B, as a dental composite material comprising (i) 50 to 85 wt.% of at least one inorganic filler, comprising at least one dental glass comprising barium aluminum borosilicate glass, barium aluminum borofluorosilicate glass, in particular silanized, preferably functionalized with methacryloxypropyl groups, and optionally at least one non-agglomerated amorphous metal oxide, in particular with a primary particle size of 2 to 45 nm, wherein the amorphous metal oxide preferably comprises precipitated silicon dioxide, precipitated silicon dioxide, zirconium oxide, mixed oxides or mixtures thereof, in particular the metal oxides are silanized. Preferably, a tooth layer comprises a correspondingly polymerized composition.

[0191] To achieve high flexural strength, the dental composite material preferably comprises, as inorganic fillers, (i.1) 50 to 84 wt.%, in particular 66 to 84 wt.%, of at least one dental glass, in particular 68 to 78 wt.%, alternatively 75 to 78 wt.%, and optionally (i.2) 1 to 10 wt.% of amorphous metal oxide, in particular 3 to 10 wt.%, preferably 4 to 8 wt.%, in the overall composition. The ratio of dental glass to amorphous metal oxide is preferably 20:1 to 5:1, more preferably 15:1 to 10:1.

[0192] Polymer-containing compositions may include polymers, in particular thermoplastic polymers, thermoplastic compositions comprising polymers, and optionally inorganic fillers, additives, auxiliaries, and / or pigments and / or dyes, and / or mixtures thereof. Typical thermoplastic polymers may include at least one high-performance polymer such as PEK, PEEK, PAEK, etc., and / or at least one engineering thermoplastic such as PA (polyamide), PC, PPA, PET, PBT, POM, PA 6, PA 66, PMMA, SPS, SAN, and / or mixtures comprising at least one of the polymers, with PMMA being particularly preferred. Additionally or alternatively, a polymer-containing composition may include standard thermoplastics such as PP, PE-HD, PE-LD, PE-LLD, PS, ABS, PVC, PLA (polylactic acid), thermoplastic elastomers (TPE), and / or mixtures comprising at least two of these. Preferably, PMMA is included in the polymer-containing composition, preferably in a quantity greater than or equal to 40 wt.-% in the total composition of 100 wt.% of the polymer-containing composition. The invention is explained in more detail with reference to the figures, without limiting the invention to these embodiments. The figures show:

[0193] Fig. 1: Schematic sketch of a natural tooth a with enamel b and dentin respectively.

[0194] Dentin core c, with the neck of the tooth adjoining the enamel b towards the root of the tooth.

[0195] Fig. 2: Arrangement of natural teeth a with tooth neck d

[0196] Fig. 3: Implant-supported denture with dental layered prosthesis 0 according to the invention with tooth layer 2 and cervical layer 3

[0197] Fig. 4.1 : Natural tooth a showing the cervical layer d and gingiva

[0198] Fig. 4.2: Dental layered prosthesis 0 with tooth layer 2, cervical layer 3 and arrangement on an implant connection geometry f on a gingiva e

[0199] Fig. 5.1 : Virtual tooth layer 2.1

[0200] Fig. 5.2 : Tooth layer 2 (real tooth layer)

[0201] Fig. 6: Part of the multi-part casting mold 4 with sealing surface 6 and inserted tooth layer 2, showing the inner surface (inside) of the tooth layer 2

[0202] Fig. 7: Multi-part mold with cavity A mold 4A and cavity B mold 4B and sprue 7 for supplying a hardenable and / or polymerizable composition to form the depicted dentin core 1 as the inner tooth region 1 with the inserted tooth layer 2 as a tooth shell or enamel layer. The parting line of the mold (located inside the multi-part mold) with sealing surface 6 is shown schematically as a line. The multi-part mold schematically shows the manufactured layered dental prosthesis 0 with dentin core 1, tooth layer 2 (tooth shell) and a sketched cervical layer 3.

[0203] Figs. 8a and 8b: Hollow form A casting mold 4A of the multi-part casting mold 4 with cavities 5 shown and in Fig. 8b with an inserted tooth shell 2. Fig. 9: Virtual dental layered prosthesis 0.1 with virtual inner tooth area 1.1, in particular dentin core 1.1, virtual tooth layer 2.1 and sketched virtual cervical layer 3.1.

[0204] Fig. 10a: Part of the multi-part casting mold 4 with sealing surface 6 and inserted tooth layer 2 with a view of the inner surface (inside) of the tooth layer 2 and the raised areas 8 shown on the inner surface as webs 8 for mechanical anchoring.

[0205] Fig. 10b: Multi-part mold with cavity A mold 4A and cavity B mold 4B and sprue 7 for supplying a hardenable and / or polymerizable composition for overmolding the intermediate product 0A and forming a second or further tooth layer, which can form in the cavity 10 and encases or embeds the inner tooth area 1, here dentin core 1, with the adjoining tooth shell 2. The parting line of the mold (located inside the multi-part mold) with sealing surface 6 is shown schematically as a line. On the surface (inside) of the tooth shell 2, which faces the inside of the surface of the second or further tooth shell to be formed, elevations 8 are shown as positioning aids for the intermediate product 0A in the cavity 5 of the multi-part casting mold (4A, 4B) to enable the formation of the cavity 10 in the casting mold for the formation of a second or further tooth layer.Furthermore, recesses 9 with undercuts are shown in the surface of the tooth shell 2, which faces the inner surface of the second or further tooth shell to be formed by adding a hardenable and / or polymerizable composition in the remaining cavity 10. The recesses 9 with undercuts serve for the mechanical anchoring of the second tooth layer to be formed as a remaining component of the first component, which is produced by the casting process.

[0206] Fig. 10c: Shows part of the casting mold 4 with recesses 11 in the sealing surface 6 for receiving and arranging the positioning aids 8 on the tooth layer 2.

[0207] Fig. 11a: Additively manufactured monolayer or component of a prosthesis 1, shown at 20x magnification. Layers or edges of the layered layers 12, obtained in the layer-by-layer material build-up process, are visible. The layer thickness ranges from 5 to 100 micrometers.

[0208] Fig. 11b: As in Fig. 11a, additively manufactured and shown at 40x magnification. Layers, or edges, of the superimposed layers 12 are visible.

[0209] Fig. 11c: Photo of the sketch Fig. 11b.

[0210] Table 1 below shows the mechanical properties of the first components produced using a material build-up process (additive) and the remaining components produced using a primary forming process (industrial, here casting). An inner tooth area or layer was produced from an identical composition using either a material build-up process (additive; composition as in the example: additive) or a primary forming process (industrial; composition as in the example: industrial, PMMA), and the mechanical properties were determined. It is clearly evident that the material loss in the chewing simulation, expressed as mean depth and / or volume loss, is 20 to over 50% lower for the sample obtained using the material build-up process (first component) than for the sample obtained using the primary forming process (remaining first component).The additive process produced a composition according to Table 1: Mechanical properties.

[0211] Mechanical properties Additive Industrial Flexural strength ISO20795-2 [MPa] 80-120 90-100 Kic ISO20795-2 [MPa * m 1 / 2 ] 1-30-1.70 1.20-1.60 Modulus of elasticity ISO 20795-1 [MPa] nm 2500-3000 Modulus of elasticity ISO 10477 [MPa] 5500-6500 nm

[0212] Poppy Abrasion 300,000 cycles, medium depth [pm] 50-70 140-240 Chewing simulation 200,000 chewing cycles, medium depth [pm] 70-80 100-150 Chewing simulation 200,000 chewing cycles, volume loss [mm 3 ] 0.060-0.080 0.100-0.140

[0213]

[0214] * Additive manufacturing refers to the tooth shell or core / Industrial manufacturing refers to the original forming process, here the "injection molding" counterpart.

[0215] In general, a high value for crack resistance hinders crack propagation and thus improves the clinical prognosis for dental materials and prostheses made from them.

[0216] Measurement methods:

[0217] ISO 20795-1 for determining the Young's modulus. The test specimens are milled from the received samples using CAD / CAM according to the specifications of ISO 20795-1 and tested.

[0218] ISO 20795-2: 2013: Test specimens according to ISO 20795-2 (50 m) are printed with this composition on a 3D precision printer with a wavelength of 405 nm (Cara Print 4.0) for subsequent testing. After printing, the specimens are rinsed with isopropanol and subjected to a post-treatment process. This is carried out by exposing both sides for 3 to 5 minutes each or, according to the manufacturer's instructions, in a HiLite Power 3D, 200 W laboratory light lamp (Külzer GmbH). Properties of the inventive mixture for model materials, tested according to DIN EN ISO 20795-2 2013 (flexural strength, section 7.5) or based on this standard. The determination of the stress intensity K (crack strength) is carried out according to section 8.4.

[0219] DIN EN ISO 10477:2020 (7.5) for determining the modulus of elasticity.

[0220] Poppy Abrasion: The evaluation is performed using a non-contact surface laser scanner (microfocus system). Each test specimen is measured over an area of ​​2 x 8 mm (resolution: 100 points / mm, z-axis resolution: 0.1 pm) in such a way that approximately 1 mm of unablated area is visible at both the front and back. The laser determines the surface properties of the abraded area: average depth across the entire width in pm, volume loss in mm. 3 Three-media abrasion machine (DMA): SD Mechatronik GmbH, test parameters: speed of sample wheel: 180 U / rnin, speed of antagonist: 240 U / rnin, test duration: 2 x 300,000 cycles, mixture: 110 g poppy seeds: 205 g water; poppy seeds: blue poppy seeds, dried for 24 h at 130°C (convection air)

[0221] Chewing simulation: Procedure as in poppy abrasion, but with the following modification: 200,000 chewing cycles in the presence of water.

[0222]

[0223] a natural tooth

[0224] b Tooth enamel

[0225] c Dental dentin

[0226] d Cervical layer of natural tooth

[0227] e Gingiva

[0228] f Implant with implant connection geometry

[0229] 0 Dental layered prosthesis

[0230] 0.1 Virtual dental layered prosthesis

[0231] 0.A Intermediate product of the layered prosthesis

[0232] 1. Inner tooth area, especially dentin core

[0233] 1.1 Virtual inner tooth area, especially dentin core

[0234] 2nd layer of teeth

[0235] 2.1 virtual tooth layer

[0236] 3 Cervical layer

[0237] 3.1 virtual cervical layer

[0238] 4 Part of the multi-part mold, 4A Hollow mold-A-mold, 4B Hollow mold-B-mold 5 Cavity

[0239] 6 Sealing surface

[0240] 7 Gate channel

[0241] 8. Raised features, in particular positioning aids and / or mechanical anchors, preferably webs and / or raised features comprising at least one undercut(s)

[0242] 9 Retentions, in particular depressions with undercuts or undercuts in the surface of the inner tooth area and / or in a surface of a tooth layer

[0243] 10 Cavity in casting mold for the formation of a second or further tooth layer

[0244] 11 recess(s)

[0245] 12 layers, in particular material layer from material-building process

Claims

Patent claims 1. Dental layered prosthesis (0), comprising at least one inner tooth region (1) and at least one tooth layer (2) partially or completely surrounding the inner tooth region, and optionally at least one cervical layer (3) as components, characterized in that a) at least one of the components selected from the at least one inner tooth region (1), which comprises at least one tooth layer (2), and optionally at least one cervical layer (3), each independently available in a material build-up process and b) at least one component selected from the at least one inner tooth region (1) comprising at least one tooth layer (2) and optionally at least one cervical layer (3), each independently obtainable in a primary forming process.

2. Dental layered prosthesis (0) comprising at least one inner tooth region (1) and at least one tooth layer (2) partially or completely surrounding the inner tooth region, and optionally at least one cervical layer (3) as components, characterized in that at least one component comprising at least one tooth layer (2) and optionally at least one cervical layer (3) opposite the at least one inner tooth region (1) as at least one component has a content of at least one inorganic filler that is at least 5 wt.% higher, in particular greater than or equal to 7.5 wt.%, preferably greater than or equal to 10 wt.%, particularly preferably greater than or equal to 15 wt.%, preferably greater than or equal to 20 wt.%.

3. A layered dental prosthesis according to claim 1, characterized in that - each of at least one component of a) and b) together form a layered dental prosthesis, or - a) the at least one component is a first component of the components of the prosthesis and b) the at least one component is a remaining component of the first components of the components of the prosthesis, wherein the at least one first component and the at least one remaining component of the first component form a dental layered prosthesis, in particular as components of the dental layered prosthesis.

4. Dental layered prosthesis according to one of claims 1 to 3, characterized in that in the primary forming process, the at least one component b), in particular the remaining component of the first component, is obtainable from a hardenable and / or polymerizable composition, in particular a composition containing polymerizable monomers, preferably by compression molding or casting.

5. Dental layered prosthesis according to one of claims 1 to 4, characterized in that a) in the material-building process, in particular a layer-by-layer material-building process, from a hardenable and / or polymerizable composition, polymer-containing composition and / or monomer-containing composition, a layer-by-layer component a), in particular the first component, is obtainable, and / or b) in the primary forming process from a hardenable and / or polymerizable composition, in particular a composition containing polymerizable monomers, in particular by compression molding or casting, at least one component b), in particular remaining component of the first components, selected from the at least one inner tooth region and / or the at least one tooth layer, and optionally at least one tooth neck layer is obtainable.

6. Dental layered prosthesis according to one of claims 1 to 5, characterized in that a) a material build-up process is a layer-by-layer material build-up process, and optionally is available in particular from a hardenable and / or polymerizable composition, a composition containing at least one polymer and / or a composition containing at least one monomer, comprising at least one inner tooth region, and / or at least one tooth layer, and optionally at least one cervical layer.

7. Dental layered prosthesis according to one of claims 1 to 6, characterized in that the inner tooth area is obtainable in a layer-by-layer material-building process, wherein the layer thickness is from 5 micrometers to 1 millimeter, in particular from 5 micrometers to 500 micrometers, preferably from 10 micrometers to 50 micrometers.

8. Dental layered prosthesis according to one of claims 1 to 7, characterized in that the at least one tooth layer, and optionally at least one neck layer, is obtainable in a primary forming process in which the at least one tooth layer, and optionally at least one neck layer, is obtained around the at least one inner tooth area.

9. Dental layered prosthesis according to one of claims 1 to 8, characterized in that a) which at least one inner tooth area optionally has at least one or more elevations on its surface, in particular the surface facing the lamina and / or cervical layer, and / or b) which each has at least one tooth layer and / or at least one tooth neck layer independently on its respective inner surface facing the inner tooth area, in particular the surface of the inner tooth area, at least one or more elevations, and / or c) which, in the dental layered prosthesis, has at least one or more raised areas on its respective inner surface facing an outer and / or inner tooth layer or at least one cervical layer, independently on its outer and / or inner surface facing an outer and / or inner tooth layer, and / or d) which, in the dental layered prosthesis, has at least one or more elevations on its respective inner surface facing an outer and / or inner cervical layer or inner tooth layer, independently of each other.

10. Dental layered prosthesis according to one of claims 1 to 9, characterized in that a) the at least one inner tooth area, in particular layered inner tooth area, is surrounded by at least one tooth layer, and optionally at least one neck layer, available in a primary forming process, or b) the at least one tooth layer, in particular at least one layered tooth layer, and optionally the at least one cervical tooth layer at least one inner tooth area partially or completely surrounded, wherein the inner tooth area is available in a primary forming process, or c) the at least one layered inner tooth region and the at least one layered tooth layer partially or completely surrounding the inner tooth region are partially or completely surrounded by at least one cervical layer obtainable in a primary forming process.

11. Dental layered prosthesis according to one of claims 1 to 10, characterized in that i) the inner tooth region (1) comprises a dentin core and a cervical region, in particular a cervical region designed as an abutment, or ii) an abutment is arranged cervically or radicularly on the inner tooth region (1) as a second component.

12. Dental layered prosthesis according to one of claims 1 to 11, characterized in that the a) component, in particular the first component and the b) component, in particular the remaining component of the first component, and / or the c) second component comprise a hardened and / or polymerized composition obtainable by hardening and / or polymerizing a hardenable and / or polymerizable composition.

13. Dental layered prosthesis according to one of claims 1 to 12, characterized in that the dental layered prosthesis comprises at least one tooth, dental prosthesis part and at least one segment of a tooth, inlay, onlay, dental crown, at least one two-unit to multi-unit dental arch and / or two-unit to multi-unit dental bridge and / or a blank of the aforementioned prostheses.

14. Method for manufacturing at least one layered dental prosthesis (0), comprising at least one inner tooth region (1) and at least one tooth layer (2) partially or completely surrounding the inner tooth region, and optionally at least one cervical layer (3) as components, comprehensive the steps - Providing at least one internal tooth area (1) obtainable by a material build-up process and / or at least one tooth layer (2) obtainable by a material build-up process and optionally at least one cervical layer (3) obtainable by a material build-up process as at least one of the components, - Providing a multi-part mold comprising at least one cavity for the production of the at least one layered dental prosthesis, wherein the multi-part mold is at least two-part and comprises at least one cavity, - as well as comprehensively the steps A) - Positioning of the at least one inner tooth area obtainable in a material build-up procedure (1) and / or the at least one tooth layer obtainable in a material build-up procedure (2) and optionally the at least one cervical layer obtainable in a material build-up procedure (3) as at least one of the components in the opened multi-part mold, in particular in the at least one cavity (5) of the opened mold, a) - closing the multi-part mold (4), - Adding a hardenable and / or polymerizable composition to the at least one cavity (5) of the multi-part mold, or b) - Adding a hardenable and / or polymerizable composition to the opened multi-part mold (4), in particular to the at least one cavity (5) of the opened mold, - Closing the multi-part casting mold (4), or B) - Adding a hardenable and / or polymerizable composition to the opened multi-part mold (4), in particular to the at least one cavity (5) of the opened mold, - Positioning of the at least one inner tooth area (1) obtainable in a material build-up procedure and / or the at least one tooth layer (2) obtainable in a material build-up procedure and optionally the at least one cervical layer (3) obtainable in a material build-up procedure as at least one of the components in the opened multi-part mold (4), in particular in the at least one cavity (5) of the opened mold, - Closing the multi-part casting mold (4), - Hardening and / or polymerizing the composition in the at least one cavity (5) of the multi-part casting mold (4), - Obtaining at least one dental layered prosthesis (0) or an intermediate product of the layered prosthesis (0.A), in particular comprising the components.

15. Method according to claim 14, characterized in that the at least one cavity (5) has the negative 3D geometry of the 3D geometry a) the dental layered prosthesis (0) comprising at least one inner tooth area (1) and at least one, in particular at least two, tooth layers (2) partially or completely surrounding the inner tooth area, and optionally at least one cervical layer (3), or b) of an intermediate product (0.A) of the dental layered prosthesis (0), comprising at least one inner tooth area (1) and at least one tooth layer (2) partially or completely surrounding the inner tooth area, and optionally at least one cervical layer (3).

16. Method according to claim 14 or 15, characterized in that the at least one cavity (5) has the negative 3D geometry of the 3D geometry a) at least one dental layered prosthesis (0) comprising at least one tooth, prosthetic part and at least one segment of a tooth, inlay, onlay, crown, two to multi-unit dental arch and / or two to multi-unit dental bridge, or b) at least one intermediate product (0.A) of the dental layered prosthesis (0) comprising at least one tooth, prosthetic part and at least one segment of a tooth, inlay, onlay, crown, two-unit to multi-unit dental arch and / or two-unit to multi-unit dental bridge.

17. Dental layered prostheses (0) obtainable by the method according to any one of claims 14 to 16.

18. Intermediate product (0A) of a dental layered prosthesis (0), in particular for the manufacture of a dental layered prosthesis (0) comprising at least two tooth layers (2), characterized in that a) it is obtainable in a process according to one of claims 14 to 16 and / or b) for obtaining the dental layered prosthesis (0), comprising at least one inner tooth region (1) and at least two tooth layers (2) partially or completely surrounding the inner tooth region, and optionally at least one cervical layer (3) as components, wherein at least one component, in particular a first component, selected from the at least one inner tooth region (1), the at least one tooth layer (2), and optionally at least one cervical layer (3), is each independently obtainable in a material build-up process, and at least one component, in particular a remaining component of the first components, is obtainable in a primary forming process. wherein in a) and / or b) at least one outermost tooth layer (2) of the tooth layer(s) partially or completely surrounding the inner tooth area (1) is not present.

19. Multi-part casting mold (4), in particular for carrying out a method according to one of claims 14 to 16, for producing at least one layered dental prosthesis (0), in particular according to one of claims 1 to 13 or 17, with at least one inner tooth area (1), at least one tooth layer (2) and / or a cervical layer (3) as components, - comprising a cavity (5) greater than or equal to a circumferential sealing edge (6) around the respective cavity (5), in particular wherein the respective sealing edge (6) is adapted by having at least one recess (11) for positioning and / or aligning, in particular a) a component, in particular a first component, comprising at least one positioning aid (8).

20. Computer program product comprising instructions which, when executed by a computer, in particular a computer of a device for carrying out a material build-up process and / or a computer of a device for carrying out a primary forming process, in particular a computer of a device for carrying out a casting process, cause it or these to produce at least one dental layered prosthesis. - from at least one virtual dental layered prosthesis (0.1), comprising at least one virtual inner tooth region (1.1) and at least one virtual tooth layer (2.1) partially or completely surrounding the inner tooth region, and optionally at least one virtual cervical layer (3.1), or from a virtual intermediate product of the dental layered prosthesis to produce by - at least a) one component, in particular a first component, selected from the at least one inner tooth region (1), which is at least one tooth layer (2), and optionally at least one tooth neck layer (3), each produced independently in a material build-up process, and - at least b) a component, in particular a remaining component of the first components, is manufactured in a primary forming process, whereby at least one dental layered prosthesis or an intermediate product thereof is obtained.

21. Virtual dental layered prosthesis (0.1), in particular in the form of a data set or 3D data model of the dental virtual layered prosthesis, as a 3D file for a device for carrying out a material build-up process and / or for a device for carrying out a primary forming process, comprising at least one virtual dental layered prosthesis (0.1), comprising at least one virtual inner tooth region (1.1) and at least one virtual tooth layer (2.1) partially or completely surrounding the inner tooth region, and optionally at least one virtual cervical layer (3.1) as a component and optionally at least one virtual intermediate product for the manufacture of the dental layered prosthesis.

22. Use of a dental layered prosthesis (0) or a dental layered prosthesis according to any one of claims 1 to 13 or 17 or obtainable by a method according to any one of claims 14 to 16, in particular as a blank of a dental layered prosthesis, for the manufacture of a surface-treated, in particular coated, varnished and / or polished dental layered prosthesis, comprising at least one tooth, prosthetic component and at least one segment of a tooth, inlay, onlay, crown, two- to multi-unit dental arch and / or two- to multi-unit dental bridge and / or a blank of the aforementioned prostheses or for the manufacture of a partial or complete denture, a bridge and / or a superstructure.

23. Data carrier signal that transmits the computer program product according to claim 20.

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