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WO2023012095A1 - Procédé de fabrication d'une base de prothèse dentaire partielle ou complète réelle - Google Patents

Procédé de fabrication d'une base de prothèse dentaire partielle ou complète réelle Download PDF

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Publication number
WO2023012095A1
WO2023012095A1 PCT/EP2022/071527 EP2022071527W WO2023012095A1 WO 2023012095 A1 WO2023012095 A1 WO 2023012095A1 EP 2022071527 W EP2022071527 W EP 2022071527W WO 2023012095 A1 WO2023012095 A1 WO 2023012095A1
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WO
WIPO (PCT)
Prior art keywords
color
gingiva
photochromic
partial
real
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2022/071527
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German (de)
English (en)
Inventor
Ulrich Koops
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kulzer GmbH
Original Assignee
Kulzer GmbH
Kulzer and Co GmbH
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Filing date
Publication date
Application filed by Kulzer GmbH, Kulzer and Co GmbH filed Critical Kulzer GmbH
Publication of WO2023012095A1 publication Critical patent/WO2023012095A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A61C13/0013—Production methods using stereolithographic techniques
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/01—Palates or other bases or supports for the artificial teeth; Making same
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/10—Fastening of artificial teeth to denture palates or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/003—Apparatus for curing resins by radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/002—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor
    • B29L2031/7532—Artificial members, protheses
    • B29L2031/7536—Artificial teeth

Definitions

  • the invention relates to a method for producing a real dental partial or full denture base using photochromic pigments.
  • Additive manufacturing methods such as the rapid prototyping method, for the production of dental products using colored layers, for example EP2671706A1
  • a significant aesthetic disadvantage of the partial or full denture bases produced in this way is the production-related monochromaticity in the case of prefabrication and/or the lack of a reproduction of a natural-looking, patient-specific, individual, multicolored color gradient of the gums (gingiva) or the tooth.
  • a disadvantage of the gum masks or gingival restorations of the prior art is their monotonous coloring and/or their lack of adaptation to the individual, nuanced color progression of a patient's dentition. So far, the gingival restorations have been made from a single red standardized shade.
  • a general method for producing three-dimensional objects using a photochromic component is disclosed in the prior art in US5514519A.
  • the composition disclosed there is polymerized using a laser with a wavelength of 325 nm, and the photochromic component in the already polymerized layer is then activated using a laser with a longer wavelength.
  • the object of the invention was therefore to provide an economical method for producing a real dental partial or full denture base whose patient-specific color gradient results from predefined target data during the production of the three-dimensional shaped body. Furthermore, there was the task of specifying an economical method that allows the production of high-quality, very aesthetic, natural-looking and, above all, individualized dentures by means of a generative method, such as rapid prototyping. In addition, there was the task of providing a high-quality, esthetic denture that has an esthetics similar to the gums as well as translucency and a patient-specific, mucosa-colored base or gingiva-colored prosthesis base corresponding to the natural patient-specific gums.
  • a method for producing a real dental partial or full denture base comprising the following method steps: i) providing a digital virtual model of the real dental partial or full denture base based on a gingiva situation with first color values that form voxels of the virtual model are assigned to the real dental partial or full denture base, and optionally analysis information regarding the geometry, morphology and color gradients of the gingiva and ii) production of the real dental partial or full denture base on the basis of the virtual model in a stereolithography-based generative process, with the Method comprising the following steps: a) providing a layer of a photopolymerizable composition on a building platform, wherein the photopolymerizable composition comprises monomers or a mixture of different monomers and optionally at least one additive un d/or at least one dye; b) photopolymerizing the layer in an exposure area, which corresponds to a layer of the virtual
  • the method according to the invention has the advantage that an adjustment of the color progression of the real dental partial or full denture base produced to real scanned color values of the gingiva of a patient is made possible.
  • Providing a layer of a photopolymerizable composition on a build platform means that a layer of a photopolymerizable composition is provided on a build platform or under a build platform. So whether the polymerizable layer is provided on or under the construction platform depends on the 3D printer used. In a printer according to FIG. 2, the layer to be polymerized is produced on the construction platform and exposed from above, while in the 3D printer according to FIG. 3 the exposure takes place from below and the layer to be polymerized is accordingly provided under the construction platform.
  • Photopolymerizable is used synonymously with radiation induced polymerizable, in particular UV and/or Vis rays induced polymerizable, particularly preferably light-induced polymerizable.
  • Photopolymerized layer is synonymous with layer polymerized by means of electromagnetic rays.
  • providing a further layer of the photopolymerizable composition on the photopolymerized layer in b) by moving the construction platform means that the layer can be provided on or under the photopolymerized layer by moving the construction platform perpendicularly to the photopolymerized layer by the layer thickness of a layer or moved by more than one layer to provide another layer of photopolymerizable composition on top of the photopolymerized layer. If the construction platform has been moved by more than one layer, it is moved back to the distance of one layer in relation to the initial situation before photopolymerization.
  • Exposure time is the length of time that a photosensitive medium is exposed to light.
  • Light absorption is a physical interaction in which light gives off its energy to matter.
  • Light absorption is a special case of the more general one physical phenomenon of absorption.
  • electromagnetic radiation is absorbed, an electron of an atom changes from an energetically more favorable state to a state with higher energy, this happens through the "electron jump".
  • the change in the light absorption properties of the photochromic dye or pigment can be detected in a changed UV/Vis spectrum of the photochromic dye or pigment between the states of a) exposure to wavelength L1 and b) exposure to radiation of wavelength L2.
  • a coloring can also be changed between the layers or layers, which corresponds to a color gradient in the z-direction. This is possible in particular without changing the monomer bath, for example the photochromic, light-curing composition.
  • a color gradient within a layer can also be made possible in this way if partial polymerization takes place during the coloring step or between two coloring steps. If desired, teeth and gums can be made in one process and from one material.
  • An exposure surface of the shaped body is irradiated, preferably by means of a surface-emitting radiation source, in particular a light source, preferably by means of a projector and/or beamer.
  • the layer to be photopolymerized is partially polymerized by means of radiation of wavelength L1 and a first color tone of the respective photochromic pigment is produced.
  • the layer to be photopolymerized is fully polymerized by means of radiation of wavelength L2 and a second shade of the respective photochromic pigment is permanently fixed. In order to activate and fix the second shade of the respective photochromic pigment, the respectively defined light intensity and/or defined exposure time must be taken into account.
  • a partial or full denture base should preferably be understood to mean a gingival imitation as a reproduction of a missing gum area, a missing gingiva or a missing gingival area, in particular for an area of the gingiva.
  • a partial or full denture base can advantageously also be part of a prosthetic treatment with dentures. In additive processes such as stereolithography, the prosthesis base is made from a gingiva-colored, polymerizable, dental composition.
  • Stereolithography methods are among the rapid prototyping methods.
  • the rapid prototyping processes are three-dimensional printing processes. Present with light (UV and/or Vis radiation) polymerizable (curable) monomers or a photopolymerizable composition comprising a mixture of monomers, preferably polymerized with UV light. Based on a 3D model in STL format, this is optionally provided with a support structure, also known as a support, to increase stability in the bath on or under the construction platform.
  • the model obtained in this way is then digitally divided into individual layers, the process is referred to as slicing.
  • the individual layers are read into a machine control and adjusted accordingly. The machine control regulates the sequence of movements and the exposure process.
  • the STL interface (STereoLithography, Standard Tessellation Language) is a standard interface of many CAD systems. It provides geometric information of three-dimensional data models for production using additive manufacturing processes/3D printing or rapid prototyping systems.
  • voxel (composed of the English volume vox and el from elements) denotes a grid point (“image” point, data element) in a three-dimensional grid. This corresponds to a pixel in a 2D image, a raster graphic.
  • image point, data element
  • voxel denotes the discrete value at an XYZ coordinate of the data set.
  • the data contained in voxel grids are often color values that are determined using volume graphics for visualization. This form of data representation is mainly used in medical imaging processes, where the discrete values can be understood as density (bones, fatty tissue) and visualized accordingly.
  • the analysis information regarding the geometry, morphology and color gradients of the gingiva is carried out using a gingiva indexing device, which makes it possible to map areas of the gingiva, in particular the human gingiva, using defined red color regions, i.e. to spatially and geometrically record, analyze and to document.
  • the gingiva indexing device allows in particular a reproducible detection, analysis and/or documentation of the gingiva situation with regard to the red tones, their color gradients and/or the morphology of the gingiva situation.
  • the gingiva indexing device enables the topographical assignment of the shades in the restoration.
  • the indexing device and the method according to the invention allow the gum colors or the gum characteristics to be recorded.
  • Dyes are inorganic or organic substances which, unlike pigments, are present in their application medium (water or organic solvents), here Monomer-containing photopolymerizable composition are soluble, preferably completely soluble. Pigments are particulate substances that do not dissolve in their application medium, in this case the photopolymerizable composition, and therefore have to be finely distributed in a binder.
  • the application medium is the substance in which the pigment is incorporated, for example in binders such as oils or plastics.
  • the term pigment refers to all coloring substances in a living organism.
  • the color stimulus is created in pigments by absorption and remission (scattering or reflection) of certain frequency components of visible light. Solid state properties such as crystal structure, crystal modification, particle size and particle size distribution, the latter due to the specific surface area, are decisive for the properties of the pigments.
  • Photochromic dyes are dyes which react to irradiation with light (radiation, in particular electromagnetic radiation), in particular UV light (sunlight or black light), with a reversible or irreversible change in hue. The light changes the chemical structure of the dyes and thus their absorption behavior (photochromism).
  • Photochromic pigments in particular encapsulated, photochromic dyes, are pigments that change their hue under the influence of radiation, i.e. light of wavelength L2 and optionally defined intensity.
  • radiation i.e. light of wavelength L2 and optionally defined intensity.
  • health safety is of particular advantage.
  • fluorescent pigments or encapsulated photochromic dyes in particular encapsulated with an organic or bio-based and/or polymerized material, could be used.
  • Particularly preferred are photochromic dyes that are completely enveloped by a polymeric material, i.e., are completely encapsulated.
  • a further embodiment provides that the voxel exposed to the radiation of wavelength L2 or the pattern has a hue that corresponds to the respective associated color value of the respective corresponding voxel of the virtual model of the real dental partial or full denture base.
  • the patient-specific color gradient of the partial or full denture base results from predefined target data during the production of the three-dimensional partial or full denture base.
  • a patient-specific gum (and tooth) replacement is created with regard to the color gradient.
  • a follow-up treatment of the generatively manufactured dental part or A full denture base to adapt the color gradient to the patient's gingiva situation is no longer required, so that the process for producing an aesthetic, natural-looking and, above all, patient-specific dental partial or full denture base is significantly shortened.
  • a natural-looking translucency and typical gum characteristics of a patient can be reproduced directly using the generative manufacturing process.
  • a voxel-by-voxel irradiation with a defined wavelength guarantees a high spatial selectivity of the color application.
  • Undesirable dispersion of the colors can be largely avoided in particular in the case of a previous partial polymerization, in particular with irradiation with light of wavelength L1, of the respective layer.
  • the gingiva situation is digitally recorded using a 3D and/or a 2D scanner, with an intraoral scanning of a patient's oral cavity taking place in particular, with the 3D and/or the 2D scanner having a CAD interface 3D and/or 2D data is available.
  • 2D and/or 3D scanners preferably scan in the wavelength range from 100 nm to 1300 nm, in particular from 280 to 850 nm.
  • the method comprises the steps:
  • the digitally recorded 3D and/or 2D data of the gingival situation corresponds to a digital virtual model of the real dental partial or full denture base based on a gingival situation with first color values
  • the digitally recorded 3D and/or 2D data of the gingiva situation is optionally processed digitally with regard to geometry, morphology and/or color gradients and analysis information with regard to geometry, morphology and color gradients of the gingiva is optionally assigned, with this 3D and/or 2D data being a digital virtual model correspond to the real dental partial or full denture base based on a gingiva situation with first color values, where the first color values are in the Munsell color space in a range of 5.3R-6.5YR, with file formats including STP, IGES, STL, X3D, COLLADA, WRL, OBJ, PLY, A
  • the invention also relates to a method comprising the steps:
  • the digital virtual model of the real dental partial or full denture base based on a gingiva situation with first color values is preferably available as a data record in an STL format.
  • patient-specific target data for creating a real partial or full denture base can be created in an advantageous manner.
  • This target data can advantageously be visualized as a three-dimensional virtual model of the real partial or full denture base to be created via suitable interfaces and made available for the generative manufacturing process for further processing. There is no need to manually create a negative impression of the patient's dentition.
  • the first color values result from the digitally recorded gingiva situation and/or the analysis information regarding the geometry, morphology and color gradients of the gingiva.
  • First color values are thus advantageously assigned to the individual voxels of the virtual model of the real partial or full prosthesis base to be created correspond to the original color values recorded during intraoral scanning. This results in an initial imaging of the gingiva situation with the original color values as a starting point for possible corrections or for a simulation of the partial or full denture base to be produced.
  • the dentist can include further analysis information regarding the geometry, morphology and color gradients of the gingiva.
  • the method comprises as a further method step, in particular in step i), an additional assignment of second color values, wherein the additional assignment of second color values according to a predefined model, which is stored in a database, and / or free of a predefined template is done.
  • the individual voxels of the virtual model of the real partial or full denture base to be created can be assigned any second color values by the dentist, for example.
  • predefined model values already stored in a database can be used, or color values can be assigned to the voxels without a template at the discretion of the dentist. This means that aesthetic and individual aspects can also be taken into account.
  • Color values and/or color scales of standardized, prefabricated imitation gums, dental implants and/or dental prostheses, which each form a starting point and are then adapted to the specific patient, can be stored in a database.
  • a color nuance and the formation of different color regions is possible in the x, y and z directions.
  • the second hue of the at least one photochromic dye, in particular the at least one photochromic pigment corresponds to the first or second color value of the respective voxel of the virtual model of the partial or full denture base.
  • the specific photochromic dye or the specific photochromic pigment assumes exactly the target color value that was previously specified in the virtual model of the dental partial or full denture base to be produced. In this way, the target and actual color values match at the respective point on the dental partial or full denture base.
  • the color values specified in the virtual model represent reference values, so to speak, the realization of which on the real dental partial or full denture base is the aim of the method according to the invention, the desired color values being realized by means of the respective second color tones of the photochromic pigments.
  • the second hue of the at least one photochromic dye, in particular the at least one photochromic pigment is permanently fixed in the composition by polymerization, preferably photopolymerization, of the monomers and optionally prepolymers.
  • the photochromism of the at least one dye, in particular the at least one photochromic pigment, irreversible, i.e. the dental partial or full denture base permanently retains the color nuance obtained at the end of the generative production by irradiation with radiation of the specific wavelength L2 in each case.
  • the location-selective application of color to the molded body and the color gradients created are retained even after the manufacturing process is complete.
  • the at least one photochromic dye in particular the at least one photochromic pigment, is organic or inorganic.
  • Health safety has top priority because of wearing the dental partial or full denture base in the mouth.
  • the photochromic substance of the present invention having the above composition is a barium magnesium silicate-based substance.
  • the photochromic dye of the present invention has a tridymite structure, ie, a structure in which SiC; -Tetrahydrons are connected to each other via their vertices, thus forming a three-dimensional tunnel structure.
  • the photochromic substance of the present invention has a structure in which a certain percentage of silicon ions (Si 4+ ) in the SiC tetrahydrons are replaced with a magnesium ion (Mg 2+ ) and a barium ion (Ba 2+ ) and the like.
  • the photochromic dye of the present invention exhibits a good photochromic property in a visible light region.
  • the photochromic dye of the present invention has a property of changing its color from white to red (pink) when blue light (eg, light having a wavelength of 405 nm) is applied and a property of changing its color from white to deep red (pink) upon exposure to ultraviolet light (e.g., light with a wavelength of 365 nm). That is, with the aforesaid composition, the resulting color of the photochromic dye can be adjusted, i.e., how much the color of the photochromic dye (reflectance) changes depending on a wavelength of light with which the photochromic substance is irradiated.
  • a photochromic property of a barium magnesium silicate can be further improved by adding aluminum (Al) and/or europium (Eu), which is known to cause an improvement in photochromism, in addition to barium magnesium silicate in addition to iron (Fe).
  • a compound containing at least one piperidine ring and having a molecular weight equal to or greater than 1000 g/mol also exhibits polychromy.
  • a photochromic dye is a photochromic dye which may be in the form of a liquid or a solid.
  • a photochromic pigment is a photochromic dye that is in the form of a solid and is insoluble in the application medium, e.g. in the composition comprising monomers.
  • the at least one photochromic dye in particular the at least one photochromic pigment, is a photochromic inorganic pigment, in particular comprising an oxide of copper, samarium, terbium, praseodymium and/or europium.
  • the organic photochromic dyes can be used either alone or in combination with one or more other photochromic, inorganic photochromic pigments, for example including rare earth doped metal oxide nanoparticles (e.g. zirconium oxide, yttria, zinc oxide, copper oxide, lanthana, gadolinium oxide, praseodymium), oxides and the like and combinations thereof doped with rare earths such as lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium and the like and combinations thereof, metal nanoparticles (eg, gold, silver, platinum, palladium, iridium, rhenium, mercury, ruthenium, osmium, copper, nickel, and the like) and combinations thereof), semiconductor nanoparticles, for example, Group II-VI.
  • rare earth doped metal oxide nanoparticles e.
  • a full range of polychromatic colors can be developed using one or more oxides selected from copper, samarium, terbium, praseodymium and europium oxides for activation.
  • the at least one photochromic dye is a photochromic organic dye, preferably at least one photochromic organic pigment.
  • the at least one photochromic dye comprises naphthacenquinone, spiropyran, spirooxazine, chromene, a naphthopyran compound, a spiro[1,8a-indolizine] derivative, a spiro[1,8a-dihydrindolizine] derivative Spiro[1,8a-tetrahydroindolizine] derivative, a spiro[fluorene-9,1[1,8a]dihydroindolizine] derivative, camphorquinone and/or phenanthrene quinone.
  • spirooxazines such as Reversacol Rush Yellow, Reversacol Midnight Gray (James Robinson) and optionally 2-spiroadamantane-2H-naphtho[1,2-b]pyran, 2-methyl-2-(para - diethylaminophenyl)-2H-naphtho[1,2-b]pyran, 1,3,3-triphenyl-3H-naphtho[2,1-b]pyran.
  • Naphthacenquinones are advantageous because, when irradiated with radiation of wavelength L2, they exhibit a clear color change from yellow to yellow-orange to orange to red, which is suitable for simulating a gum characteristic.
  • Photochromic dyes can have auxochromic substituents.
  • the second hue includes color values of the YCM color space, in particular red or yellow color nuances of the YCM color space.
  • the at least one photochromic dye in particular the at least one photochromic pigment, has color values of the YCM color space, in particular red or yellow color nuances, when irradiated with radiation of wavelength L2.
  • the gingiva with its translucency can be realistically reproduced using these color nuances. Mixing different color values also results in color effects that are very similar to those of natural gingiva.
  • a color region in the area of the dental partial or full denture base, in particular in the area of the gingiva, preferably has a shade of red.
  • a color region can also have different defined shades of red in a defined arrangement or in a typical color gradient.
  • the color regions can preferably be three-dimensional color bodies, which preferably reproduce typical red color gradients and/or a typical morphology of an area of a gingiva.
  • the method according to the invention for producing a real dental partial or full denture base therefore has a lifelike reproduction of the colors, color gradients of the red tones of the natural gingiva, preferably at least 2 to 5000 different red tones, particularly preferably 5 to 2000 different red tones.
  • a color region corresponds to a delimited two- or three-dimensional area comprising at least one shade of red. It is preferred here if the color regions are arranged from a light shade of red to a dark shade of red and/or from a red with yellow components to a red with blue components.
  • Advantageous color gradients include a Kodak color scale, RGB model, CMYK model, Pantone, HKS fans, RAL color system, or other color systems familiar to those skilled in the art that include red tones or shades of red.
  • the duration of the irradiation of a layer to be photopolymerized of the molding being formed is shortened overall, since an entire area is exposed and the layer to be photopolymerized is not scanned point by point. Overall, the production process of generative stereolithography is thus shortened.
  • the exposure area forms a layer of the real partial or full denture and corresponds to a layer (x,y data in the z-plane) of the virtual model of the digital dental partial or full denture base.
  • the exposure area therefore has a defined outer contour that lies on the outer surface of the prosthesis base.
  • a high UV irradiance in combination with a large and evenly irradiated area are the main features of the UV LED projector.
  • the UV LED modules are water-cooled, high-performance UV floodlights with intelligent LED drivers.
  • the absence of ineffective infrared radiation significantly reduces heat compared to traditional UV lamps.
  • the high irradiance enables extremely short processing times. For example, wavelengths of 365, 385, 395, 405 and 450 nm are available for irradiating the photochromic dyes or pigments.
  • UV LED projectors are increasingly being used in addition to ultraviolet (UV) lasers.
  • Methods for this are known, for example, from EP 1880830 A1 and EP 1894705 A2.
  • a disadvantage of lasers is their punctiform exposure field.
  • the UV light from the light source is projected onto a light-curing plastic as an exposure field.
  • Optics and a surface light modulator are used for imaging. Due to the optics, there is an inhomogeneous light distribution or intensity distribution.
  • the edge areas of the exposure field typically have a lower intensity than the areas in the center of the exposure field. This effect, also known as barrel image, means that the light-curing plastic does not have the same intensity at every point and therefore hardens differently, i.e. inhomogeneously.
  • EP 1 982 824 A2 proposes that To homogenize the intensity distribution by reducing the lighter pixels of the UV projector to the intensity level of the pixels at the edge using a gray distribution.
  • the method comprises the step: a respective conversion of a second hue into the specific wavelength L2, wherein by using several photochromic pigments and activation by different specific wavelengths L2 of the radiation and intensities different color values of the YCM color space, of the RGB color space, the Munsell color space or the L*a*b* color space.
  • a UV LED beamer preferably has irradiation segments with different wavelengths and intensities, so that a large number of photochromic dyes in the respective layer to be photopolymerized are excited to change color at the same time.
  • there is software that converts the target color values of the respective voxels of the virtual model of the dental partial or full denture base to be produced into specific wavelengths L2 and controls the UV LED projector segment by segment during irradiation with regard to wavelength, light intensity and exposure time.
  • a surface light modulator which has a large number of controllable, tiltable micromirrors arranged in rows and columns, in which the light from a surface-emitting light source is imaged via optics and an exposure field of the imaged light source is guided over a projection surface with the surface light modulator, with a number of pixels that increases towards the center of the exposure field is not illuminated, so that the light intensity of all pixels illuminated on the projection surface is homogenized in the time integral.
  • the particularly suitable DLP® chips from Texas Instruments can be used as surface light modulators.
  • a laser system can be used. Both the beamer and the laser system preferably emit light of a wavelength selected from 180 to 650 nm, preferably from 230 to 450 nm.
  • polychromatic light sources can be used as beamers. Beamers with a resolution of greater than or equal to 800 ⁇ 600 pixels are preferred, preferably greater than or equal to 1920 ⁇ 1080 pixels.
  • the planar light source, the planar light modulator and the optics, in particular a lens system form an arrangement.
  • the planar light source, the planar light modulator and the optics, in particular a lens system are also present as an arrangement in a structural unit.
  • the invention relates to a dental partial or full prosthesis base which was produced using the method according to the invention, in particular at least one prosthesis base plate, in particular a gingiva imitation as a reproduction of a missing gum area, a missing gingiva or a missing gingiva part.
  • a gingiva restoration according to the invention has a lifelike reproduction of the colors, color gradients of the red tones of the natural gingiva, preferably at least 2 to 5000 different red tones, particularly preferably 5 to 2000 different red tones.
  • the invention relates to the use of at least one photochromic dye in a method for producing a real dental partial and/or full denture base, whereby color values of the YCM color space, of the RGB color space, the Munsell color space or the L*a*b* color space.
  • planar light source (1) the planar light modulator (4) and/or the lens system/optics
  • FIG. 2 shows a schematic cross-sectional view of a structure for implementing the method according to the invention.
  • Fig. 3 shows a 3D printer in which the exposure takes place from below.
  • 1 shows a flowchart of the individual method steps of the method according to the invention. 1 shows a flowchart to show the various method steps of the method 100 for producing a real dental partial or full denture base.
  • step 101 a patient's teeth are digitally recorded using a 3D scanner.
  • a patient's gingival situation is recorded digitally.
  • step 102 at least part of the digital 3D data relating to the morphology of the teeth is digitally analyzed as the basis for producing a real partial or full denture base.
  • the digital analysis includes an analysis of at least one area of the gingiva situation in terms of its red shades, the position of the red shades, the color progression of the red shades, their geometry and/or their morphology, the analysis being carried out manually and/or digitally, and gingival information is obtained, particularly in the form of gingival mapping.
  • gingival information is obtained, particularly in the form of gingival mapping.
  • a virtual or real model of a gingiva restoration is produced as a replica of the missing gum area or gingiva area.
  • a virtual model of the dental partial or full denture base is created on the basis of the previously collected analysis data.
  • individual color values are assigned to individual voxels of the virtual model, the color values either corresponding to the originally digitally recorded color values of the scanned dentition, in particular the gingiva, are taken from a database or the assignment is made freely at will.
  • the real color gradient taken from a mouth scan of the patient is converted into a data set. This digital color gradient can then be translated into different wavelengths of the incident light when using photochromic dyes, in particular photochromic pigments.
  • the real partial or full denture base is produced by means of stereolithography.
  • the processes are adapted to real scanned data.
  • the apparatus 0 for carrying out the stereolithographic method 105.
  • a container 8 there is a construction platform 12 which can be moved in the vertical direction.
  • a liquid, photochromic composition 6 (light-curing liquid plastic) containing, for example, epoxy resin or an acrylate(s).
  • the light-curing composition comprises electromagnetic radiation-polymerizable monomers, preferably dental, UV- and/or Vis-polymerizable monomers.
  • the photochromic dye is already present in the liquid, photopolymerizable composition, in particular photochromic composition 6, in microencapsulated form.
  • fluorescent pigments or encapsulated dyes in particular dyes encapsulated with an organic or bio-based polymer, are used.
  • the activation of the various photochromic color pigments could be triggered, for example, by a projector which images a projection surface with locally different wavelengths and/or intensities on the surface of the bath containing the photochromic composition or moves it over its surface.
  • a projector which images a projection surface with locally different wavelengths and/or intensities on the surface of the bath containing the photochromic composition or moves it over its surface.
  • the color values are converted into wavelengths.
  • a UV LED projector 1 that emits ultraviolet light (UV light) is irradiated onto a surface light modulator 4 .
  • the UV LED projector 1 has a resolution of 1920 ⁇ 1080 pixels, which emit as a rectangular area on the surface of a chip of the UV LED projector 1.
  • the area light modulator 4 comprises a large number of controllable micromirrors, with which the light from the UV LED projector 1 is reflected and imaged onto the surface of a liquid, light-curing plastic 6 with the aid of a lens system 2 .
  • the micromirrors are shown in FIG. 1 as small, differently oriented rectangles on a surface of the planar light modulator 4 .
  • the liquid light-curing composition 6 is arranged in the container 8 which is open at the top to the surface light modulator 4 or the lens system 2 .
  • the lens system 2 which is only shown schematically as a simple lens in FIG. 1, images the surface of the pixels of the UV LED projector 1 onto the surface of the light-curing, photochromic composition 6 comprising polymerizable monomers and at least one photochromic dye or photochromic pigment.
  • a suitable motor not shown
  • the UV LED projector 1 is moved over the container 8 and the surface of the light-curing composition 6 is thereby swept with the exposure field, so that each line of the chip of the UV LED projector 1 is exposed to each Point completely overruns or can overrun.
  • the resulting exposure field on the surface of the light-curing composition 6 polymerizes the monomers so that a solid molded body 10 is formed.
  • the solid mold 10 is mounted on a construction platform 12, which is slowly lowered layer by layer so that the upper surface of the mold 10 is wetted by the liquid light-curing composition 6 and a new polymerized layer can be produced on the mold 10 using the exposure field .
  • the photopolymerization synonymous with radiation-induced polymerization, in particular UV and/or Vis polymerization, is continued layer by layer until the resulting molded body 10 matches the virtual model of the dental partial or full denture base.
  • the UV LED projector is designed to emit both light of wavelength L1 for partial polymerization of the light-curing, photochromic composition 6 and light of wavelength L2 for permanent fixing of the second hue of the respective photochromic pigment. If the UV LED projector forms a projection surface with locally different wavelengths/intensities on the surface of the monomer bath of the polymerizable composition or if it guides it over the surface, different specific wavelengths L2 of different photochromic color pigments can be realized and the respective second color of the respective photochromic color pigments are generated on or in the shaped body 10.
  • the defined light intensity and/or defined exposure time required for activating and permanently fixing the respective photochromic pigment, which depends on the respective wavelength must also be met.
  • FIG 3 shows a 3D printer in which exposure takes place from below and the layer to be polymerized is accordingly provided under the construction platform 12 (bottom-up 3D stereolithography).
  • the construction platform 12 is successively moved vertically (along the z-axis) from bottom to top after each photopolymerization step.
  • the exposure by means of a UV LED projector 1 takes place from below through a translucent window 5 of the container 8 in which the photochromic, light-curing composition 6 is located.
  • the molded body 10 is formed in layers below the construction platform 12.
  • a 3D printer from the manufacturer B9Creations based in Rapid City in the USA is preferably used.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Dental Preparations (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une base de prothèse dentaire partielle ou complète réelle, le procédé comprenant les étapes de procédé suivantes : i) la fourniture d'un modèle virtuel numérique de la base de prothèse dentaire partielle ou complète réelle sur la base d'une situation de gencive comportant des premières valeurs de couleur attribuées à des voxels du modèle virtuel de la base de prothèse dentaire partielle ou complète réelle, et éventuellement des informations d'analyse concernant la géométrie, la morphologie et les progressions de couleur de la gencive, et ii) la production de la base de prothèse dentaire partielle ou complète réelle sur la base du modèle virtuel selon un procédé d'additif à base de stéréolithographie, le procédé comprenant les étapes suivantes : a) la fourniture d'une couche d'une composition photopolymérisable sur une plateforme de construction, la composition photopolymérisable comprenant des monomères ou un mélange de différents monomères et éventuellement au moins un additif et/ou au moins un colorant ; b) la photopolymérisation de la couche dans une zone d'exposition correspondant à une couche du modèle virtuel de la base de prothèse dentaire partielle ou complète réelle, par exposition à un rayonnement de longueur d'onde L1 ; c) la fourniture d'une autre couche de la composition photopolymérisable au-dessus de la couche photopolymérisée dans b) par un mouvement de la plateforme de construction ; d) la répétition des étapes b) et c) jusqu'à ce qu'un article formé revêtant la forme de la base de prothèse dentaire partielle ou complète réelle soit façonné, la composition photopolymérisable comprenant au moins un colorant photochrome ayant une première nuance, dont les propriétés d'absorption de la lumière sont variables, par soumission, après l'étape ii) a), ou après ii) b), ou pendant l'étape ii) b), de la couche à photopolymériser ou de la couche photopolymérisée à une exposition d'au moins un voxel ou ou d'au moins une structure de voxels dans la zone d'exposition à un rayonnement d'une longueur d'onde L2 qui est différent du rayonnement de longueur d'onde L1, le ou les colorants photochromes prenant une seconde nuance. L'invention concerne également une base de prothèse dentaire partielle ou complète et l'utilisation d'au moins un colorant photochrome dans le procédé de production d'une base de prothèse dentaire partielle et/ou complète réelle.
PCT/EP2022/071527 2021-08-03 2022-08-01 Procédé de fabrication d'une base de prothèse dentaire partielle ou complète réelle Ceased WO2023012095A1 (fr)

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DE102021120194.2A DE102021120194B9 (de) 2021-08-03 2021-08-03 Verfahren zur Herstellung einer realen dentalen Teil- oder Vollprothesenbasis
DE102021120194.2 2021-08-03

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EP1894705A2 (fr) 2004-05-10 2008-03-05 Envisiontec GmbH Procédé de production d'un objet en trois dimensions a résolution améliorée par décalage de pixels
EP1982824A2 (fr) 2006-04-28 2008-10-22 Envisiontec GmbH Procédé et dispositif destinés à la fabrication d'un objet tridimensionnel à l'aide d'un éclairage par masques
EP1880830A1 (fr) 2006-07-19 2008-01-23 Envisiontec GmbH Procédé et dispositif pour la fabrication d'un article tridimensionel et un ordinateur et un support d'une information associés
US20100119996A1 (en) * 2008-11-13 2010-05-13 Kaigler Sr Darnell Method and system for forming a dental prosthesis
WO2011077175A1 (fr) * 2009-12-23 2011-06-30 Haraszti Gyoergy Procédé de création d'une prothèse dentaire amovible, et fabrication associée de la prothèse dentaire
WO2011091228A1 (fr) * 2010-01-22 2011-07-28 Dsm Ip Assets B.V. Résines liquides solidifiables aux rayonnements et pouvant se solidifier en couches avec des effets visuels sélectifs, et procédés d'utilisation
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