Multicolored milling blank for implant-supported dental prosthetic restorations

Abstract

Dental blank (1) for the production of a dental prosthetic restoration (10) by subtractive machining, comprising (i) an internal connecting part (2) which has a framework area (3a) in the direction of the coronal area of ​​the dental blank and has an implant connection geometry (3b) in the radicular direction of the dental blank, (ii) wherein the framework area (3a) of the connecting part (2) is connected to a dentin framework area (4) in the direction of the coronal area of ​​the blank (1), and (iii) the dentin framework area (4) is formed from a metal oxide or metal oxide mixture and extends towards the coronal area of ​​the blank (1) with a (iv) outer area (5) of the blank is connected, wherein the outer area (5) of the blank is formed from a dental composite material, a dental glass ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer component, and (v) the dental blank has an elongated lumen (6) inside the implant connection geometry (3b) of the inner connecting part (2) and optionally in the framework area (3a) of the inner connecting part (2), which extends from the top (2.1) to the bottom (2.2) of the implant connection geometry (3b) of the inner connecting part (2) and optionally from the top (3.1) to the bottom (3.2) of the framework area (3a), and the lumen has an opening in the crestal or lingual direction and an opening in the radicular direction.

Description

[0001] Dental blank for producing a dental prosthetic restoration, in particular a multi-colored dental prosthetic restoration, by machining the outer region of the blank, comprising (i) an inner connecting part which has a preferably peg-shaped framework region in the direction of the coronal region of the dental blank and an implant connection geometry in the radicular direction of the dental blank, (ii) wherein the framework region of the connecting part is connected to a dentin framework region in the direction of the coronal region of the blank, and (iii) the dentin framework region is connected to an (iv) outer region of the blank in the region of the tooth enamel in the direction of the coronal region of the blank, and (v) wherein the dental blank has an elongated lumen on the inside for fastening the produced dental prosthetic restoration with a connecting screw or a bolt to an implant or abutment.Furthermore, the invention relates to a system for producing a dental blank and the method for producing the blank.

[0002] To fabricate dental prosthetic restorations supported by implants or tooth stump-supported restorations, it is known to produce bridges, crown caps, or dental framework structures, which are subsequently covered with a tooth-colored veneer, from milling blanks using an abrasive process. Until now, dental prosthetic restorations manufactured using an abrasive process have been made from monoblocks with a holder for the milling machine that can be clamped into the milling machine, or from milling discs, i.e., cylindrical plates. A variety of prosthetic restorations are generally produced from these milling discs. The abrasive processing of these milling discs is usually carried out centrally in a milling center equipped with appropriate CAD / CAM equipment.

[0003] CAD / CAM processes are computer-aided manufacturing methods for, for example, aesthetic prosthetic dental restorations, such as bridges and crowns. CAD / CAM stands for Computer Aided Design, and CAM stands for Computer Aided Manufacturing.

[0004] In automated material removal processes, hereinafter referred to simply as abrasive processes, 3D workpieces are produced from CAD data using a CAM process. Common abrasive processes include milling, drilling, cutting, chipping, polishing, melting, and / or at least two of these abrasive process steps. In addition to the well-known CAD / CAM processes, so-called laser milling, a material removal process using laser beams, can also be used in the future to process blanks for the production of prosthetic dental restorations. To achieve the desired results, the material properties of the blanks must be specifically adapted to the laser milling process.

[0005] DE 10 2012 108 153 A1 discloses a blank with a block part and a framework part. US 8 962 146 B2 discloses multicolored blanks. WO 2015 / 001 088 A1 discloses a semi-finished product with a base body and anchoring element. DE 10 2013 102 402 A1 discloses a milling blank with an angled channel. DE 10 2013 014 660 A1 relates to a blank with a curved screw channel for producing a superstructure.

[0006] One object of the invention was to enable the decentralized production of dental prosthetic restorations that preferably also closely resemble a natural tooth aesthetically. Preferably, the material-removing machining of a milling blank should be enabled in a significantly more economical process, in which the production, processing, and adjustment of the dental prosthetic restoration can preferably be carried out directly within a single treatment appointment. In particular, the machining properties of the blank should be very good with regard to fracture strength and / or Young's modulus.

[0007] The objects of the invention are achieved by the inventive dental blank, in particular a dental milling blank, according to claim 1, as well as by the method for producing the blank according to claim 10, as well as by the system for producing a blank according to claim 13 and the system for producing a prosthetic restoration. Preferred embodiments of the blank are presented in the subclaims and in more detail in the description.

[0008] Thus, the preferred alternative of the blank according to the invention with an outer region made of a hybrid ceramic shows significantly improved material properties compared to unfilled purely ceramic milling blanks that can be milled in CAD / CAM processes to produce blanks for prosthetic molded parts.

[0009] The subject of the invention is a dental blank, in particular a milling blank, for producing a dental prosthetic restoration, such as an implant and optionally abutment-supported single tooth restoration, for example a crown, preferably a multi-coloured dental prosthetic restoration, by a material-removing machining of the blank, in particular of the outer region of the blank, comprising (i) an inner connecting part which has a framework area in the direction of the coronal area of ​​the dental blank, in particular a peg-shaped, preferably one-piece framework area, and has an implant connection geometry in the radicular direction of the dental blank, in particular the connecting part is made of a metal or a metal alloy, preferably of titanium, a titanium alloy, gold, a gold alloy or cobalt-chromium, (ii) wherein the framework region of the connecting part is connected to a dentin framework region in the direction of the coronal region of the blank, and wherein (iii) the dentine framework area is formed from a metal oxide or metal oxide mixture and is coated towards the coronal area of ​​the blank with a (iv) outer region of the blank, wherein (iv) the outer region (5) of the blank is formed from a dental composite material, a dental glass ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer content, and (v) the dental blank has an elongated lumen inside the implant connection geometry in the inner connecting part and optionally in the framework area of ​​the inner connecting part, which lumen extends from the top to the bottom of the implant connection geometry of the inner connecting part and optionally from the top to the bottom of the framework area of ​​the inner connecting part, and wherein the lumen has an opening in the crestal or lingual direction and an opening in the radicular direction.

[0010] According to an alternative, the lumen for accommodating a connecting screw is essentially cylindrical or designed as an elongated lumen with an arcuate profile and optionally with threaded sections in the radicular direction. An arcuate profile of the lumen refers to a lumen that has more than one longitudinal central axis. For example, the lumen may have longitudinal central axes in some regions, with these longitudinal central axes being at an angle to each other that is different from 0° or different from 180°.

[0011] The outer region of the blank corresponds to the enamel area of ​​a natural tooth. The inner connecting part is preferably located in the cervical region of the dental prosthetic restoration and is preferably peg-shaped. According to another preferred alternative, the inner connecting part is formed from a single piece of material.

[0012] The framework area can be detachably or permanently connected to the dentin framework area. Thus, the connection between the framework area and the dentin area can be positively, non-positively, or even bonded, or a combination thereof. Likewise, the dentin framework area can be detachably or permanently connected to the outer area. Thus, the connection between the dentin framework area and the outer area can be positively, non-positively, or even bonded, or a combination thereof.

[0013] The invention also relates to a blank, in particular a milling blank, wherein the dental blank has an elongated lumen which extends from the top side of the outer region to the bottom side of the implant connection geometry of the inner connecting part, and wherein the lumen extends through the inner connecting part comprising the connection geometry and the framework part, the dentin framework region and the outer region and has an opening in the crestal or lingual direction and an opening in the radicular direction.

[0014] Furthermore, the dental blank can have an elongated lumen extending from the top of the outer region to the bottom of the implant connection geometry of the connecting part, wherein the lumen extends through the inner connecting part, the dentin framework region, and the outer region and has an opening in the crestal or lingual direction and an opening in the radicular direction, and the outer region encloses the dentin framework region cervically or in the cervical region. Furthermore, it is preferred if the dentin framework region encloses the framework region cervially or in the cervical region.

[0015] The subject of the invention can thus also be a blank with an elongated lumen which extends from the top to the bottom of the outer region, from the top to the bottom of the dentin framework region and from the top to the bottom of the connecting part, so that the lumen extends through the inner connecting part, the dentin framework region and the outer region and has an opening in the crestal or lingual direction on the top of the outer region and an opening in the radicular direction on the bottom of the implant connection geometry.

[0016] According to a preferred alternative, the subject of the invention is a dental blank having an elongated lumen extending from the top side of the outer region to the bottom side of the implant connection geometry of the connecting part, in particular the lumen extends through the entire inner connecting part, the dentin framework region and the outer region and has an opening in the crestal or lingual direction and an opening in the radicular direction, wherein the elongated lumen (a) can have at least one longitudinal axis, in particular (a.1) the elongated lumen can be rotationally symmetrical to its one longitudinal axis and / or (a.2) the elongated lumen can have longitudinal central axes in some regions and the lumen can preferably be curved, for example with a non-changing diameter, and / or (b) the elongated lumen can be angled and have at least two intersecting longitudinal axes, and / or (c) the elongated lumen can be curved, for example with a changing diameter, and / or (d) the opening of the elongated lumen can have at least one larger diameter in the crestal or lingual direction, in particular at the top side of the outer region, the top side of the dentin framework region and / or the top side of the framework region, than the opening, in particular at the bottom side of the implant connection geometry of the inner connecting part, in the radicular direction.

[0017] According to the invention, the lumen has a diameter suitable for accommodating a connecting screw or bolt for securing the prosthetic device to an implant. Optionally, the lumen can also have a threaded section.

[0018] The invention also relates to a blank comprising (i) an inner connecting part comprising the framework region and the implant connection geometry, wherein the connecting part is made of at least one metal or metal alloy. Preferably, the inner connecting part is made of titanium, a titanium alloy, gold, a gold alloy, or a cobalt-chromium alloy. Particularly preferably, the connecting part is made of a titanium, gold, or cobalt-chromium alloy. The connecting part is preferably made of a single piece of a metal or metal alloy.

[0019] Furthermore, it is preferred if the blank in (iii) the dentin framework region is formed from a metal oxide or metal oxide mixture containing magnesium oxide (MgO) and / or ytterbium oxide (Y2O3). Preferably, the blank in (iii) the dentin framework region can be formed from a metal oxide or metal oxide mixture, wherein the metal oxide or metal oxide mixture can be selected from zirconium dioxide, aluminum oxide, or a zirconium oxide / aluminum oxide mixture, each of which independently optionally contains magnesium oxide (MgO) and / or ytterbium oxide (Y2O3).

[0020] According to an alternative, the dentin framework region or the outer region of the blank can be formed from a metal oxide or a metal oxide mixture or an open-pored ceramic framework, wherein the open-pored porosity of the ceramic framework can be from 10 to 80 wt.%, in particular from 20 to 70 wt.%, preferably from 30 to 60 wt.%. In particular, the open-pored ceramic framework can be filled with 20 to 90 wt.%, in particular with 30 to 80 wt.%, preferably with 40 to 70 wt.%, of at least one polymer, based on the total composition. According to the invention, the open-pored ceramic framework can be filled with a polymer, in particular to improve the processing properties of the ceramic framework in material-removing processes.

[0021] The dentin framework region or the open-pore ceramic framework of the outer region can preferably comprise or consist of zirconium dioxide, aluminum oxide, mixed oxide(s) comprising zirconium dioxide and zirconium dioxide and / or silicon carbide. Zirconium dioxide is particularly preferred, in particular with a zirconium dioxide content of greater than or equal to 50 wt. %, in particular with a zirconium dioxide content of greater than or equal to 70 wt. Alternatively, aluminum oxide with a content of greater than or equal to 95 wt. %, in particular greater than or equal to 99.7 wt. %, preferably greater than or equal to 99.99 wt. Furthermore, particularly preferred ceramic frameworks have a zirconium dioxide content of greater than or equal to 50 to 100 wt.-%, optionally additionally comprising magnesium, such as (Mg-PSZ, partially stabilized), MgO, zirconium dioxide (Y-TZP, partially stabilized) comprising Y2O3, zirconium dioxide HIP state (Y-TZP, partially stabilized) comprising Y2O3, ZrO2 / Al2O3 mixed oxide, SiSiC a silicon-infiltrated silicon carbide, silicon carbide sintered without free silicon, hot-pressed silicon carbide without free silicon. Preference is given to ceramic frameworks with a content of zirconium dioxide, aluminum oxide, mixed oxide comprising zirconium dioxide and / or silicon carbide of greater than or equal to 70 wt.% to 100 wt.%, in particular greater than or equal to 73 wt.%, preferably greater than or equal to 85 wt.%, greater than or equal to 90 wt.%, wherein the framework is preferably stabilized with an yttrium compound and / or magnesium oxide.

[0022] According to a preferred alternative, the dentin framework region can comprise a metal oxide or a metal oxide mixture, in particular comprising a zirconium dioxide content of 50 to 100 wt.%, in particular from 70 to 100 wt.%, preferably from 85 to 100 wt.%, particularly preferably from 90 to 100 wt.%, and optionally comprising a content of at least one other metal oxide, semimetal oxide and / or silicon carbide, in particular one of the aforementioned oxides or mixtures thereof selected from yttrium, aluminum, magnesium, potassium, calcium, lithium, and optionally silicon, with a content of 0 to 50 wt.%, in particular from 0 to 30 wt.%, preferably from 0 to 15 wt.%, particularly preferably from 0 to 10 wt.%, the total composition being 100 wt.%. Other metal oxides and semi-metal oxides which are preferred are yttrium oxide, in particular Y2O3, MgO, Al2O3, in particular with a content of 0 to 50 wt.%, in particular of 0 to 30 wt.%, preferably of 0 to 15 wt.-%, particularly preferably from 0 to 10 wt.%.

[0023] According to a preferred alternative, the outer region can comprise a ceramic framework, in particular the outer region comprises an open-pore ceramic framework of a dental hybrid ceramic with a polymer portion comprising a zirconium dioxide content of 50 to 99.9 wt.%, in particular from 70 to 99.9 wt.%, preferably from 85 to 99.9 wt.%, particularly preferably from 90 to 99.9 wt.% or from 50 to 97 wt.%, and optionally comprising a content of other metal oxides, semi-metal oxides, silicon carbide, in particular one of the aforementioned, or mixtures thereof selected from yttrium, aluminum, magnesium, potassium, calcium, lithium, and optionally silicon, with a content of 0.1 to 50 wt.% or from 3 to 50 wt.%, in particular from 0.1 to 30 wt.%, preferably from 0.1 to 15 wt.%, particularly preferably from 0.1 to 10 wt.%, wherein the total composition is 100 wt.% amounts.

[0024] A dentin framework region which is particularly preferred according to the invention comprises a metal oxide or a metal oxide mixture, or the outer region comprises a ceramic framework, in particular the outer region comprises an open-pore ceramic framework comprising a zirconium dioxide content of 50 to 98 wt.%, in particular of 70 to 98 wt.%, and a yttrium oxide content, in particular yttrium(III) oxide, of 0.01 to 20 wt.%, in particular of 0.1 to 15 wt.%, particularly preferably of 1 to 15 wt.%, and optionally or alternatively with a magnesium oxide content of 0.01 to 10 wt.%, in particular of 0.1 to 5 wt.%, and / or optionally with a aluminum oxide content, in particular Al2O3, of 0.01 to 30 wt.%, in particular of 0.1 to 25 wt.%, the total content being 100 wt.%. Typical ceramic frameworks according to the invention comprise ZrO2 / Y2O3 with a content of 95 wt.% ZrO2 and 5 wt.% Y2O3 or ZrO2 / Y2O3 / Al2O3 with a content of approximately 95 wt.-% ZrO2 and approximately 4.75 wt.% Y2O3 and approximately 0.25 wt.% Al2O3; ZrO2 / Al2O3 / Y2O3 with a content of approximately 76 wt.% ZrO2 and 20 wt.% Al2O3 and 4 wt.% Y2O3; ZrO2 / Y2O3 with a content of approximately 90 wt.% ZrO2 and 10 wt.% Y2O3; ZrO2 / MgO with a content of approximately 96.5 wt.% ZrO2 and 3.5 wt.% MgO.

[0025] According to the invention, (iv) the outer region of the blank is formed from a dental composite material, optionally a glass ceramic of a specific composition; a dental ceramic, such as an open-pore ceramic, or a dental hybrid ceramic with a polymer component, particularly preferably a hybrid ceramic with an open-pore ceramic framework with a polymer component. The open-pore ceramic framework can preferably have the aforementioned or subsequently stated composition. The polymer component preferably comprises the polymer components stated below.

[0026] Furthermore, it is particularly preferred if the (iv) outer region of the dental blank consists of A) a dental composite material comprising (a) 40 to 80 wt.% inorganic fillers, in particular comprising dental glasses; in particular barium glass powder and / or strontium glass powder, barium aluminum fluorosilicate dental glasses; and / or calcium carbonate (so-called "whiskers") (b) 60 to 20 wt. % of at least one polymer component based on the polymerization of at least one monomer or a monomer mixture comprising urethane (meth)acrylate, such as UDMA (diurethane dimethacrylate), tricyclo[5.2.1.02.6]decane (TCD) urethane derivative, TCD-di-HEA (bis(acryloyloxymethyl)tricyclo[5.2.1.02,6]decane), in particular 2-propenoic acid, (octahydro-4,7-methane-1H-indene-5-diyl)bis(methyleneiminocarbonyloxy-2,1-ethanediyl) ester), TCD-di-HEMA (bis(methacryloyloxymethyl)tricyclo[5.2.1.0 2,6]decane-HEMA (HEMA: 2-hydroxyethyl methacrylate), the methyl acrylate derivative of TCD-di-HEA, and / or TEGDMA (triethylene glycol dimethacrylate) and optionally at least one triple, quadruple or penta-crosslinker, or B) a lithium disilicate as a dental glass ceramic, or C) a hybrid ceramic, in particular a dental hybrid ceramic with a polymer component, preferably a dental hybrid ceramic, wherein the ceramic component is preferably an open-pore ceramic framework. The pores of the open-pore ceramic framework are preferably filled with a polymer and form the polymer component.

[0027] According to one embodiment, the inorganic fillers in the composite material can comprise dental glasses, which can comprise different particle size fractions such as coarse-particle dental glasses and fine-particle dental glasses, and optionally dental glasses with an average particle size. In general, the particle size distribution can be from 5 nm to 20 µm. Particles The average particle size of the coarse-particle dental glasses is preferably from 5 to 10 µm, in particular around 7 µm, and that of the fine-particle dental glasses from 0.5 to 2 µm, in particular around 1 µm. Optionally, dental glasses with an average particle size of 2 to 5 µm and / or very coarse-particle dental glasses with a particle size of 10 to 50 µm can also be used.

[0028] The preferred flexural strength of the composite material is 145 to 169 MPa according to DIN EN 4049:2009.

[0029] The following composition of the lithium disilicate is preferred according to the invention: 55 to 70 wt% SiO2, 10 to 15 wt% LiO2, 10 to 20 wt% of the stabilizer selected from the group consisting of ZrO2, HfO2 or mixtures thereof, 0.1 to 5 wt% K2O, 0.1 to 5 wt% Al2O3, 0 to 10 wt% of additives and 0 to 10 wt% of dyes or pigments.

[0030] The polymer component can alternatively or additionally be based on the polymerization of monomers comprising at least one of the following monomers. Accordingly, the polymer portion can be based on the polymerization of monomers comprising at least one of the following monomers: Suitable monomers are the monomers commonly used in the dental field: Examples are radically polymerizable monofunctional monomers such as mono(meth)acrylates, methyl, ethyl, butyl, benzyl, furfuryl or phenyl(meth)acrylate, polyfunctional monomers such as polyfunctional acrylates or methacrylates, e.g. bisphenol A di(meth)acrylate, Bis-GMA (an addition product of methacrylic acid and bisphenol A diglycidyl ether), UDMA (urethane dimethacrylate), e.g.an addition product of 2-hydroxyethyl methacrylate and 2,2,4-hexamethylene diisocyanate), di-, tri-, or tetraethylene glycol di(meth)acrylate, decanediol di(meth)acrylate, dodecanediol di(meth)acrylate, hexyldecanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and butanediol di(meth)acrylate. Particularly preferred are bis-GMA, TEDMA (triethylene glycol dimethacrylate), TCD-di-HEMA (bis(methacryloyloxymethyl)tricyclo[5.2.1.02,6]decane), and TCD-di-HEA (bis(acryloyloxymethyl)tricyclo[5.2.1.02,6]decane).

[0031] At least one urethane (meth)acrylate can be selected from bis(methacryloxy-2-ethoxycarbonylamino)alkylene, diurethane acrylate oligomer, alkyl-functional urethane dimethacrylate oligomers, aromatic-functionalized urethane dimethacrylate oligomers, aliphatic unsaturated urethane acrylates, bis(methacryloxy-2-ethoxycarbonylamino) substituted polyether, aromatic urethane diacrylate oligomers, aliphatic urethane diacrylate oligomers, monofunctional urethane acrylates, aliphatic urethane diacrylates, hexafunctional aliphatic urethane resins, aliphatic urethane triacrylate, UDMA, aliphatic urethane acrylate oligomer, unsaturated aliphatic urethane acrylate.

[0032] As polyfunctional monomer, at least one monomer selected from the following or mixtures thereof can be used: 2,2-bis-4-(3-methacryloxy-2-hydroxy-propyl)-phenylpropane) (Bis-GMA), ie the reaction product of glycidyl methacrylate and bisphenol A (containing OH groups), and 7,7,9-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diazahexadecane-1,16-diyl dimethacrylate (UDMA), ie the urethane dimethacrylate from 2 mol of 2-hydroxyethyl methacrylate (HEMA) and 1 mol of 2-2,4-trimethylhexamethylene diisocyanate (containing urethane groups). In addition, reaction products of glycidyl methacrylate with other bisphenols, such as bisphenol B (2,2'-bis-(4-hydroxyphenyl)-butane), bisphenol F (2,2'-methylenediphenol) or 4,4'-dihydroxydiphenyl, as well as reaction products of 2 mol of HEMA or 2-hydroxypropyl (meth)acrylate with, in particular 1 mol, known diisocyanates, such as hexamethylene diisocyanate, m-xylylene diisocyanate or tolylene diisocyanate, are suitable as crosslinking monomers.

[0033] The following can also be used as polyfunctional monomers: diethylene glycol di(meth)acrylate, decanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate as well as butanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate.

[0034] The polymer component can alternatively or additionally be based on the polymerization of monomers comprising at least one of the following monomers. Accordingly, the polymer component can be based on the polymerization of monomers comprising at least one of the following monomers: One or more ethylenically unsaturated compounds with or without acid functionality. For example, acrylic acid esters, methacrylic acid esters, hydroxy-functional acrylic acid esters, hydroxy-functional methacrylic acid esters, and combinations thereof. As well as mono-, di- or poly-(meth)acrylates, i.e. acrylates and methacrylates, such as methyl (meth)acrylate, ethyl acrylate, isopropyl methacrylate, n-hexyl acrylate, stearyl acrylate, allyl acrylate, glycerol triacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,3-propanediol (meth)acrylate, trimethylolpropane triacrylate, 1,2,4-butanetriol trimethacrylate, 1,4-cyclohexanediol diacrylate, pentaerythritol tetra(meth)acrylate, sorbitol hexacrylate,Tetrahydrofurfuryl (meth)acrylate, bis[I-(2-acryloxy)]-p-ethoxyphenyldimethylmethane, bis[I-(3-acryloxy-2-hydroxy)]-p-propoxyphenyldimethylmethane, ethoxylated bisphenol A di(meth)acrylate and trishydroxyethylisocyanurate trimethacrylate, (meth)acrylamides (i.e., acrylamides and methacrylamides) such as (meth)acrylamide, methylene-bis-(meth)acrylamide and diacetone(meth)acrylamide; urethane (meth)acrylates; the bis-(meth)acrylates of polyethylene glycols (preferably with a molecular weight of 200-500), copolymerizable mixtures of acrylated monomers, and vinyl compounds such as styrene, diallyl phthalate, divinyl succinate, divinyl adipate and divinyl phthalate. Other suitable radically polymerizable compounds include siloxane-functional (meth)acrylates and fluoropolymer-functional (meth)acrylates, or mixtures of two or more radically polymerizable compounds may be used if necessary.

[0035] The polymer component can alternatively or additionally be based on the polymerization of monomers comprising at least one of the following monomers. Accordingly, the polymer portion can be based on the polymerization of monomers comprising at least one of the following monomers: hydroxyalkyl (meth)acrylates, such as 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate; glycerol mono- or di-(meth)acrylate; trimethylolpropane mono- or di-(meth)acrylate; pentaerythritol mono-, di-, and tri-(meth)acrylate; sorbitol mono-, di-, tri-, tera-, or penta-(meth)acrylate; and 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (BisGMA) or mixtures of ethylenically unsaturated compounds. As well as PEGDMA (polyethylene glycol dimethacrylate with a molecular weight of about 400), GDMA (glycerol dimethacrylate), and / or NPGDMA (neopentyl glycol dimethacrylate) and mixtures containing these.

[0036] To initiate polymerization, the composites may contain a polymerization initiator, for example, a radical polymerization initiator. Depending on the type of initiator used, the mixtures can be cold-cured, radiation-crosslinked, i.e., UV-crosslinked, or polymerized by applying heat.

[0037] Known peroxides such as dibenzoyl peroxide, dilauroyl peroxide, tert-butyl peroctoate or tert-butyl perbenzoate, but also alpha, alpha'-azo-bis(isobutyroethyl ester), benzpinacol and 2,2'-dimethylbenzpinacol can be used as initiators for the temperature-induced polymerization.

[0038] Suitable photoinitiators include, for example, benzoin alkyl ethers or esters, benzil monoketals, acylphosphine oxides, or aliphatic and aromatic 1,2-diketo compounds, such as 2,2-diethoxyacetophenone, 9,10-phenanthrenequinone, diacetyl, furil, anisil, 4,4'-dichlorobenzil, and 4,4'-dialkoxybenzil, or camphorquinone. The photoinitiators are preferably used in conjunction with a reducing agent. Examples of reducing agents include amines such as aliphatic or aromatic tertiary amines, for example, N,N-dimethyl-p-toluidine or triethanolamine, cyanoethylmethylaniline, triethylamine, N,N-dimethylaniline, N-methyldiphenylamine, N,N-dimethyl-sym.-xylidine, N,N-3,5-tetramethylaniline, and ethyl 4-dimethylaminobenzoate, or organic phosphites. Common photoinitiator systems include camphorquinone plus ethyl 4-(N,N-dimethylamino)benzoate, 2-(ethylhexyl)-4-(N,N-dimethylamino)benzoate, or N,N-dimethylaminoethyl methacrylate.2,4,6-Trimethylbenzoyldiphenylphosphine oxide is particularly suitable as an initiator for UV light-initiated polymerization. UV photoinitiators can be used alone or in combination with a visible-light initiator, a cold-curing initiator, and / or an initiator for temperature-induced curing.

[0039] Free-radical systems, such as benzoyl or lauroyl peroxide, together with amines such as N,N-dimethyl-sym.-xylidine or N,N-dimethyl-p-toluidine, are used as initiators for cold polymerization. Dual-curing systems, such as photoinitiators with amines and peroxides, can also be used. The initiators are preferably used in amounts of 0.01 to 1 wt.% based on the total mass of the mixture.

[0040] Also suitable as initiators for the cold polymerization is a redox system comprising a peroxide and a reducing agent selected from ascorbic acid, ascorbic acid derivative, barbituric acid or a barbituric acid derivative, sulfinic acid, sulfinic acid derivative, particularly preferred is a redox system comprising (i) barbituric acid or thiobarbituric acid or a barbituric acid or thiobarbituric acid derivative and (ii) at least one copper salt or copper complex and (iii) at least one compound containing an ionic halogen atom; particularly preferred is a redox system comprising 1-benzyl-5-phenylbarbituric acid, copper acetylacetonate, and benzyldibutylammonium chloride. Polymerization in the two-component dental material is particularly preferably initiated via a barbituric acid derivative.

[0041] For cold-curing, it may be advantageous to prepare the composite material in two components that are designed to be cured by mixing. It is also possible to prepare the material in such a way that it can be cured by both VIS and / or UV light and by mixing two components.

[0042] The inorganic fillers preferably comprise barium-aluminium-fluorosilicate dental glasses.

[0043] The a) 40 to 80 wt.% inorganic fillers may preferably comprise 0.5 to 10 wt.% non-agglomerated nanofillers with particle sizes of 1 to 50 nm; at least 60 wt.% of a mixture of fillers consisting of 50 to 90 wt.% coarse and 10 to 50 wt.% fine-particle dental glasses, which have a size ratio, based on the average particle size (d 50-value), from fine-particle to coarse-particle of 1:4 to 1:30, whereby the information in wt.% refers to the total composition of inorganic fillers, optionally the filler component can contain at least one further dental glass with a particle size different from the coarse-particle and fine-particle dental glasses.

[0044] A mixture of fillers made from coarse and fine-particle dental glasses, with a size ratio of 1:4 to 1:30, preferably 1:4 to 1:20, and especially approximately 1:5 to 1:10, allows for better packing of the filler particles and thus a higher filler content. The higher filler content results in a lower proportion of shrinkable monomer matrix (see above). The proportion of fine-particle dental glasses should not exceed 40% by weight of the total filler composition.

[0045] Barium glass powder, preferably barium aluminum fluorosilicate dental glasses and / or strontium glass powder, are particularly suitable as dental glasses. The average particle size of the coarse-particle dental glasses is preferably 5 to 10 µm, in particular around 7 µm, and that of the fine-particle dental glasses is 0.5 to 2, in particular 1 µm. Optionally present additional dental glasses have average grain sizes of, for example, 2 to 5 or 10 to 50 µm. The inorganic fillers can therefore comprise dental glasses with a total of three or more grain fractions. They can also contain other conventional fillers commonly used in the dental field, such as quartz, glass ceramics, or mixtures thereof. In addition, the composites can contain fillers to achieve increased radiopacity. The average particle size of the radiopaque filler is preferably in the range of 100 to 300 nm, in particular 180 to 300 nm. Suitable radiopaque fillers are, for example:the fluorides of the rare earth metals described in DE 35 02 594 A1, ie the trifluorides of elements 57 to 71. A particularly preferably used filler is ytterbium fluoride, in particular ytterbium trifluoride with an average particle size of about 300 nm. The amount of the X-ray opaque filler is preferably 10 to 50 wt.%, particularly preferably 20 to 30 wt.%, based on the total filler content.

[0046] Precipitated mixed oxides, such as ZrO2 / SiO2, can also be used as fillers. Mixed oxides with a particle size of 200 to 300 nm, especially about 200 nm, are preferred. The mixed oxide particles are preferably spherical and uniform in size. The mixed oxides preferably have a refractive index of 1.52 to 1.55. Precipitated mixed oxides are preferably used in amounts of 25 to 75 wt.%, especially 40 to 75 wt.%.

[0047] As non-agglomerated nanofillers, for example, SiO2, ZrO2, TiO2 and / or Al2O3 with particle sizes < 50 nm can be used as inorganic filler.

[0048] The (b) 60 to 20 wt.% of at least one polymer component in the composite material is preferably based on the polymerization of a monomer mixture of i. 60-80 wt.% TCD-di-HEMA or TCD-di-HEA and optionally Bis-GMA, ii. 10 to 18 wt.% UDMA, iii. The remainder TEDMA and / or at least one triple crosslinker, quadruple crosslinker, and / or pentacrosslinker, and 0 to 1 wt.% initiator(s) based on the total monomer mixture. The content of TCD monomers in the total composition of the dental composite is preferably from 1 to 15 wt.%.

[0049] The lithium disilicate may comprise 50 to 85 wt% silicon dioxide, 10 to 20 wt% Li2O, 0.0 to 15.00 wt% K2O, 0.0 to 8.0 wt% ZrO2, 0.0 to 5.0 wt% Al2O3, 0.0 to 5.0 wt% MgO, and optionally 0.0 to 10.0 wt% inorganic pigments, in particular oxidic pigments, wherein the total composition of lithium disilicate is 100 wt%.

[0050] The lithium disilicate may preferably comprise, as an X-ray opaque agent, a content of a fluoride of the rare earth metals described in DE3502594A1, ie the trifluorides of elements 57 to 71. A particularly preferably used filler is ytterbium fluoride, in particular ytterbium trifluoride with an average particle size of about 300 nm. The amount of the X-ray opaque filler is preferably 0.001 to 50 wt.% with respect to the total content of lithium disilicate, preferably 1 to 30 wt.%, particularly preferably 10 to 30 wt.%, with respect to the total content of lithium disilicate.

[0051] The hybrid ceramic preferably comprises a ceramic component, wherein the ceramic component is preferably a ceramic framework. The ceramic framework preferably comprises from 50 to 70 wt.% SiO2, from 15 to 30 wt.% Al2O3, from 5 to 15 wt.% Na2O, from 2 to 10 wt.% K2O, from 0.05 to 5 wt.% B2O3, from 0.0001 to 1 wt.% ZrO2, and from 0.0001 to 1 wt.% CaO, the total composition being 100 wt.%. Particularly preferably, the ceramic framework comprises from 55 to 65 wt.% SiO2, from 20 to 25 wt.% Al2O3, from 8 to 12 wt.% Na2O, from 3 to 7 wt.% K2O, from 0.05 to 3 wt.% B2O3, from 0.0001 to 1 wt.% ZrO2 and from 0.0001 to 1 wt.% CaO, the total composition being 100 wt.%.

[0052] The polymer content in the hybrid ceramic, in particular as a polymer component, is preferably based on the polymerization of UDMA (urethane methacrylate) and TEGDMA (triethylene glycol dimethacrylate), wherein the proportion of the polymer content, in particular as a polymer component, is preferably from 2 to 50 wt.%, preferably from 10 to 20 wt.%, in the total composition of the hybrid ceramic.

[0053] The flexural strength of the hybrid material is preferably at least 140 MPa, preferably from 150 to 160 MPa. The hardness of the hybrid material is preferably about 2.5 GPa.

[0054] The hybrid ceramic particularly preferably has a polymer content, in particular as a polymer component, of 2 to 50 wt.%, in particular of 2 to 25 wt.%, preferably of 10 to 20 wt.%, and a ceramic content, in particular of an open-pore ceramic framework, of 50 to 98 wt.%, in particular of 75 to 98 wt.% in relation to the total composition (ad. 100 wt.%) of the hybrid ceramic, wherein the hybrid ceramic can contain 0.0 to 8.0 wt.% pigments in the proportion of the polymer component and / or in the ceramic proportion.

[0055] The hybrid ceramic of the outer region of the blank comprises at least one polymer component, particularly as a polymer component, to improve the machining properties of the blank. The blank comprises an open-pore ceramic framework containing 2 to 50 wt.% of at least one polymer, based on the overall composition of the dental ceramic blank. The terms polymer, polymer component, and polymer component are used synonymously.

[0056] According to a further embodiment, the blank can have a (iii) dentin framework area with the following color according to the color space L*a*b, in particular according to DIN EN ISO 11664-4, with L 50 to 80, a 2 to 5 and b 15 to 22, and / or an (iv) outer area with the following color according to the color space L*a*b, in particular according to DIN EN ISO 11664-4, with L 60 to 95, a -5 to 3 and b 3 to 2. The dentin framework area is preferably made of an opaque material with the aforementioned colors and / or the outer area is made of a transparent material with the aforementioned colors.

[0057] The invention also relates to a method for producing a dental blank and a blank obtainable by the method, wherein a dental prosthetic restoration is preferably obtainable from the blank by (material) removing processing, wherein the blank is produced by (i) an inner connecting part is provided which has a framework area in the direction of the coronal area of ​​the blank, in particular a peg-shaped framework area, and an implant connection geometry in the radicular direction of the blank, and (ii) the framework area of ​​the inner connecting part is connected to a dentine framework area in the direction of the coronal area of ​​the blank, in particular the framework area is not detachably connected to the dentine framework area, preferably the framework area is connected to the dentine area in a form-fitting, force-fitting, material-fitting or a combination of form-fitting and / or force-fitting and / or material-fitting manner, and (iii) the dentine framework area is formed from a metal oxide or metal oxide mixture and is coated towards the coronal area of ​​the blank with a (iv) outer region of the blank is connected, in particular the dentine framework region is not detachably connected to the outer region, preferably the dentine framework region is connected to the outer region in a form-fitting, force-fitting, material-fitting or a combination of form-fitting and / or force-fitting and / or material-fitting, wherein (iv) the outer region (5) of the blank is formed from a dental composite material, a dental glass-ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer content, and (v) the dental blank has an elongated lumen within the implant connection geometry of the inner connecting part and optionally within the framework region of the inner connecting part, extending from the top to the bottom of the implant connection geometry of the inner connecting part and optionally extending from the top to the bottom of the framework region of the inner connecting part, and the lumen has an opening in the crestal or lingual direction and an opening in the radicular direction. Particularly preferably, the lumen extends from the top of the outer region to the bottom of the implant connection geometry.

[0058] According to a preferred embodiment, (iii) the dentin framework region can comprise one or more layers of a metal oxide or a metal oxide mixture, wherein the multiple layers preferably have different colors corresponding to the color space L*a*b. According to one embodiment, the overall appearance of the dental blank, comprising the inner connecting part, the dentin framework region, and the outer region, is adjusted to the Vita classic shade guide A1 to D4. The colors correspond to A1 to A4 (reddish-brownish), B1 to B4 (reddish-yellowish), C1 - C4 (gray tones), and D2 - D4 (reddish-gray).

[0059] According to the invention, it is particularly preferred if the overall impression of all color layers in the dentin framework area L 50 to 80, a 2 to 5 and b 15 to 22 and / or the outer area L 60 to 95, a -5 to 3 and b 3 to 2 of the color space L*a**b.

[0060] According to a preferred embodiment, the dentin framework region can comprise one to five layers of a metal oxide or a metal oxide mixture, as well as optionally pigments. The layer thicknesses can each independently range from 200 µm to 5 mm, in particular from 200 µm to 1 mm, preferably from 0.5 mm to 1 mm. Particularly preferably, the one to five layers completely enclose the outer framework region, which is formed, for example, from a titanium alloy.

[0061] The dentin framework, in particular the respective layers of the dentin framework, preferably each contain pigments independently of one another. The pigments generally have a particle size of d 90 less than or equal to 20 µm to less than 15 µm and also less than or equal to 10 µm. Usually the d 50of the pigment particles by 0.001 to 10 µm. Conventional inorganic pigments can be used as inorganic pigments. Suitable for producing the dentin framework region are inorganic pigments that are essentially color-stable up to above 850 °C, preferably up to 1200 °C. Thus, the inorganic pigments preferably have color stability above 850 °C, in particular from 850 to 1050 °C, preferably from 900 to 930 °C. The pigment selected in each case is preferably selected from oxides, oxide hydrates, sulfides, sulfates, carbonates and silicates of the transition metals, such as preferably pigments comprising zirconium and / or iron, depending on the one or more layers of a metal oxide or a metal oxide mixture in the dentin framework region. Known pigments include zirconium silicates, iron silicates, iron oxides, manganese oxides, chromium oxides, γ-Fe2O3, Fe3O4 / Fe2O3, Cr2O3, TiO2.Furthermore, the inorganic pigments can include colored pigments, luster pigments, metallic effect pigments, in particular luster pigments with flake-like or scale-like metal particles, such as iron oxide red, strontium yellow, aluminum or silver bronzes, pearlescent pigments or gold bronze, aluminum bronze.

[0062] Particularly preferred inorganic colored pigments include iron oxides, zirconium praseodymium silicate (Zr,Pr)SiO4 (CAS No.: 68187-15-5), zirconium iron silicate (Zr,Fe(SiO4)), (CAS No: 68412-79-3), zinc iron chromium brown spinel (Zn,Fe)(Fe,Cr)2O4, (CAS No.: 68186-88-9), zinc iron chromium brown spinel (Zn,Fe)(Fe,Cr)2O4, (CAS No.: 68186-88-9), chromium tin pink sphene CaO:SnO2:SiO2:Cr2O3, (CAS No.: 68187-12-2).

[0063] According to a further embodiment, in the method, in the blank, and in the system for producing the blank, (ii) the framework region and the dentin framework region can have a geometric indexing on their inner, opposing surfaces, preferably in order to equip the framework region and the dentin framework region so that they can be connected in a defined position, and optionally (iii) the dentin framework region and the outer region can have a geometric indexing on their inner, opposing surfaces, preferably in order to equip the dentin framework region and the outer region so that they can be connected in a defined position. The indexing preferably corresponds to a complementary structure of the opposing inner surfaces, complementary structuring of the surface, such as at least one projection, and at least one complementary depression.

[0064] Furthermore, it is preferred if, in the method, (ii) the framework region and the dentin framework region are connected to one another in a form-fitting, force-fitting, material-fitting manner or in a combination of form-fitting and / or force-fitting and / or material-fitting manner and / or (iii) the dentin framework region and the outer region are connected to one another in a form-fitting, force-fitting, material-fitting manner or in a combination of form-fitting and / or force-fitting and / or material-fitting manner.

[0065] According to the invention, an open-pore ceramic framework, in particular a sintered framework, is infiltrated with at least one monomer, optionally with polymerization initiator(s). After infiltration and polymerization to form polymers, the ceramic framework exhibits improved material properties. The material thus produced is a dental hybrid ceramic. The infiltration of the open-pore ceramic framework can take place in a bath comprising the at least one monomer, optionally with polymerization initiator(s). Subsequently, the polymerization of a liquid infiltrated monomer or a monomer mixture can take place.

[0066] The invention also relates to a system for producing a dental blank, wherein the system a) comprises, as individual interconnectable components, an inner connecting part, a dentin framework region made of a metal oxide or metal oxide mixture, and an outer region made of a dental composite material, a dental glass ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer content. Alternatively, a system for producing a prosthetic restoration comprising a blank according to the invention and preferably an adhesive, a plastic or liquid hybrid material for the integral connection, and / or an implant screw.

[0067] The respective lumen is designed in the connecting part, dentin framework area, outer area or in the blank to accommodate a connecting screw in order to be able to fix the prosthetic restoration with an implant or an abutment on an implant.

[0068] According to a further alternative, the system may comprise an adhesive, a plastic or liquid hybrid material for the cohesive connection and / or an implant screw.

[0069] According to a further alternative, the subject of the invention is the use of a blank or a system for producing a multi-coloured dental prosthetic restoration, in particular an implant-supported single-tooth restoration, such as a crown, in a material-removing process.

[0070] The invention is explained in more detail below with reference to the schematic figures, without limiting the invention to these embodiments.

[0071] Fig. 1a shows a blank 1 according to the invention with an inner connecting part 2, see also Fig. 3, which has a framework area 3a and an implant connection geometry 3b as well as a dentin framework area 4 and an outer area 5. The outer area 5 is machined using a material-removing process so that the area takes on the contour of at least one tooth surface of a single-tooth restoration, such as a crown. The elongated, straight lumen 6 has a longitudinal axis (x). The lumen extends into the outer area. The blank has an elongated lumen 6 in the implant connection geometry 3b and in the framework area 3a, which extends from the top side 2.1 to the bottom side 2.2 of the implant connection geometry 3b and from the top side 3.1 to the bottom side 3.2 of the framework area 3a and has an opening in the crestal direction and an opening in the radicular direction. Furthermore, the elongated lumen 6 extends from the upper side 8.1 of the outer region 5 to the lower side 2.2 of the implant connection geometry 3b.

[0072] In Fig. Figure 1b shows a blank whose lumen 6 does not extend into the outer region 5. The lumen 6 can be crestal-expanded in the dentin framework region 4 and optionally in the framework region 3a, and can be milled in the outer region during the subsequent milling process. At least in the area of ​​the implant connection geometry 3b, the lumen is preferably cylindrical. Fig. 1b, the dentin framework area 4 has two layers 4a and 4b.

[0073] Fig. Figure 1c shows a machined blank according to the invention with an inner connecting part 2, which has a framework area 3a and an implant connection geometry 3b, as well as with a dentin framework area 4 and an outer area 5, which was machined in the material-removing process and takes on the contour of at least one tooth surface of a prosthetic single-tooth restoration 10. The elongated lumen 6 in the blank is bent lingually in the outer area 5. The blank of the Fig. 1c had a lumen in the framework area before machining. The lumen in the dentin framework area and in the outer area 5 was created using a material-removing process, specifically milling. Alternatively, a blank can have an elongated lumen curved lingually. In this case, the blank bears a reference on its outer surface to determine the lingual side of the prosthesis to be fabricated before drilling.

[0074] Fig. 2 shows a system according to the invention for producing a dental blank 1 comprising the individual components that can be connected to one another: inner connecting part 2, dentin framework region 4 and outer region 5.

[0075] The blank according to the invention can then preferably be used in an automated milling process with significantly less material waste, since the breaking strength and the modulus of elasticity of the blanks significantly better withstand the milling process without any chipping of parts of the blank during the milling process.

Claims

[1] Dental blank (1) for producing a dental prosthetic restoration (10) by abrasive processing, comprising (i) an inner connecting part (2) which has a framework region (3a) in the direction of the coronal region of the dental blank and an implant connection geometry (3b) in the radicular direction of the dental blank, (ii) wherein the framework region (3a) of the connecting part (2) is connected to a dentine framework region (4) in the direction of the coronal region of the blank (1), and (iii) the dentine framework region (4) is formed from a metal oxide or metal oxide mixture and is provided in the direction of the coronal region of the blank (1) with a (iv) outer region (5) of the blank, wherein the outer region (5) of the blank is formed from a dental composite material, a dental glass ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer content, and (v) the dental blank has an elongated lumen (6) inside the implant connection geometry (3b) of the inner connecting part (2) and optionally in the framework area (3a) of the inner connecting part (2), which lumen extends from the top side (2.1) to the bottom side (2.2) of the implant connection geometry (3b) of the inner connecting part (2) and optionally from the top side (3.1) to the bottom side (3.2) of the framework area (3a), and the lumen has an opening in the crestal or lingual direction and an opening in the radicular direction. [2] Blank according to claim 1, characterized bythat the dental blank (1) has an elongated lumen (6) which extends from the upper side (8.1) of the outer region (5) to the lower side (2.2) of the implant connection geometry (3b) of the connecting part (2), and the lumen (6) extends through the inner connecting part (2), the dentin framework region (4) and the outer region (5) and has an opening in the crestal or lingual direction and an opening in the radicular direction. [3] Blank according to claim 1 or 2, characterized byin that the dental blank (1) has an elongated lumen (6) which extends from the upper side (8.1) of the outer region (5) to the underside (2.2) of the implant connection geometry (3b) of the connecting part (2), wherein the elongated lumen (a) has at least one longitudinal axis, (b) the elongated lumen is angled and has at least two intersecting longitudinal axes, (c) the elongated lumen (6) is arcuate and / or (d) the opening of the elongated lumen in the crestal or lingual direction has at least a larger diameter than the opening on the underside (2.2) of the implant connection geometry (3b) of the inner connecting part (2) in the radicular direction. [4] Blank according to one of claims 1 to 3, characterized by that (i) the inner connecting part (2) comprising the framework region (3a) and the implant connection geometry (3b) is made of at least one metal or a metal alloy. [5] Blank according to one of claims 1 to 4, characterized by that (iii) the dentin framework region (4) is formed from a metal oxide or metal oxide mixture containing magnesium oxide (MgO) and / or ytterbium oxide (Y2O3). [6] Blank according to one of claims 1 to 5, characterized by that (iii) the dentin framework region (4) is formed from a metal oxide or metal oxide mixture and is selected from zirconium dioxide, aluminum oxide or a zirconium oxide / aluminum oxide mixture, wherein the metal oxide or metal oxide mixture optionally contains magnesium oxide (MgO) and / or ytterbium oxide (Y2O3). [7] Blank according to one of claims 1 to 6, characterized by that (iv) the outer region (5) of the blank is formed from a dental composite material, a dental glass ceramic or a dental hybrid ceramic. [8] Blank according to one of claims 1 to 7, characterized bythat (iv) the outer region (5) of the dental blank (1) consists of A) a dental composite material comprising (a) 40 to 80 wt.% inorganic fillers, (b) 60 to 20 wt.% polymer component based on the polymerization of at least one monomer or a monomer mixture comprising urethane (meth)acrylate, TCD-di-HEA, TCD-di-HEMA, TEGDMA and optionally at least one triple, quadruple or pentacrosslinker, or B) a lithium disilicate as a dental glass ceramic, or C) a hybrid ceramic having a polymer content of 2 to 25 wt.% and a ceramic content, in particular a porous ceramic content, of 75 to 98 wt.% with respect to the total composition of the hybrid ceramic, wherein the hybrid ceramic contains 0.0 to 8.0 wt.% pigments in the polymer content and / or in the ceramic content. [9] Blank according to one of claims 1 to 8, characterized bythat (iii) the dentine framework area (4) of the blank has the following colour according to the colour space L*a*b: L 50 to 80, a 2 to 5 and b 15 to 22, and / or (iv) the outer area (5) of the blank has the following colour according to the colour space L*a*b: L 60 to 95, a -5 to 3 and b 3 to 2. [10] A method for producing a dental blank according to any one of claims 1 to 9, wherein the blank is produced by (i) an inner connecting part (2) is provided which has a framework region (3a) in the direction of the coronal region of the blank and an implant connection geometry (3b) in the radicular direction of the blank, and (ii) the framework area (3a) of the inner connecting part (2) is connected to a dentine framework area (4) in the direction of the coronal area of ​​the blank (1), and (iii) the dentine framework region (4) is formed from a metal oxide or metal oxide mixture and is provided in the direction of the coronal region of the blank (1) with a (iv) outer region (5) of the blank, wherein the outer region (5) of the blank is formed from a dental composite material, a dental glass ceramic comprising lithium disilicate, or a hybrid ceramic with a polymer content, and wherein (v) the dental blank has an elongated lumen (6) inside the implant connection geometry (3b) of the inner connecting part (2) and optionally in the framework area (3a) of the inner connecting part (2), and the lumen extends from the top side (2.1) to the bottom side (2.2) of the implant connection geometry (3b) of the inner connecting part (2) and optionally from the top side (2.1) to the bottom side (2.2) of the framework area (3a) of the inner connecting part (2), and the lumen has an opening in the crestal or lingual direction and an opening in the radicular direction. [11] Method according to claim 10, characterized bythat (ii) the framework region (3a) and the dentine framework region (4) have a geometric indexing on their inner opposing surfaces in order to equip the framework region (3a) and the dentine framework region (4) so ​​that they can be connected in a defined position and optionally (iii) the dentine framework region (4) and the outer region (5) have a geometric indexing on their inner opposing surfaces in order to equip the dentine framework region (4) and the outer region (5) so that they can be connected in a defined position. [12] Method according to claim 10 or 11, characterized by that (ii) the framework region (3a) and the dentine framework region (4) can be connected to one another in a form-fitting, force-fitting and / or material-fitting manner and / or (iii) the dentine framework region (4) and the outer region (5) can be connected to one another in a form-fitting, force-fitting and / or material-fitting manner. [13] System for producing a dental blank according to one of claims 1 to 9, characterized by that the system comprises individual interconnectable components - an inner connecting part (2), - a dentine framework area (4) made of a metal oxide or metal oxide mixture, and - an outer region (5) made of a dental composite material, a dental glass ceramic comprising lithium disilicate or a hybrid ceramic with a polymer content. [14] System for producing a dental prosthetic restoration (10) comprising a dental blank according to one of claims 1 to 9 and an adhesive, a plastic or liquid hybrid material for the cohesive connection and / or an implant screw. [15] Use of a blank according to one of claims 1 to 9 or a system according to claim 14 for producing a multi-coloured dental prosthetic restoration (100) in a material-removing process.

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