Abutment-integrated restoration for cutting machining and method for manufacturing the same

Abstract

This invention relates to an integrated abutment restorative block for machining, specifically disclosing an integrated abutment restorative block for machining. This integrated abutment restorative block is a dental restorative block formed by integrating a crown block of material that does not require heat treatment after machining with the abutment. The integration is achieved through an adhesive layer containing a curing agent containing polymeric organic compounds, thereby enabling machining such as CAD / CAM processing in the integrated state of the crown and abutment. Artificial teeth such as temporary or permanent dentures can be manufactured through machining in the block state without further heat treatment after machining, shortening the treatment time of dental implant restoration and enabling single-day restoration surgery.

Description

Technical Field

[0001] This invention relates to an integrated abutment restorative block for machining, providing a dental restorative block in which a crown block made of material that does not require heat treatment after machining is integrally formed with the abutment and can be applied in an integrated state to machining processes such as CAD / CAM. Background Technology

[0002] Currently, the main challenges in dentistry are improving patient aesthetics and reducing treatment time through single-day procedures. To this end, dentistry has primarily focused on developing related materials and equipment. In the materials sector, materials such as zirconia, crystallized glass, and composite materials are mainly used. In the equipment sector, computer-aided design / computer-aided manufacturing (CAD / CAM) equipment is primarily employed. These changes have enabled dentistry to achieve numerous improvements, such as meeting patients' aesthetic requirements and reducing treatment time through single-day procedures. However, due to the continuous demands of patients and dentists, methods continue to be developed based on existing technologies.

[0003] Dental restorations are typically categorized into inlays, onlays, veneers, and crowns based on the location where they are applied, and into temporary and permanent prostheses based on their intended use. The required physical properties vary depending on the location and purpose, allowing for material selection based on these properties. For example, composite materials and polymethyl methacrylate (PMMA) offer excellent processability and aesthetics, and can be directly implanted into the mouth without further heat treatment after processing. However, their physical properties are lower than other materials, limiting their use to inlays or onlays, where they function as temporary prostheses. Regarding composite materials, continuous research is underway to develop composites with high physical properties, enabling their use in permanent prostheses for small molars. Zirconia is considered to have the highest physical properties among dental restorative materials besides metals, but its aesthetics are lower and it requires further heat treatment after processing; therefore, it is primarily used for permanent prostheses for posterior teeth. However, to address this issue, methods such as altering the Y2O3 (yttrium oxide) content have been employed to develop zirconia materials with lower physical properties than existing zirconia materials but improved aesthetics, and these are currently being commercialized. One common problem with zirconia and crystallized glass materials is the need for further heat treatment after processing, which prolongs the treatment time. Solving this problem is also a major research topic, and leading manufacturers have begun to launch products that address this issue.

[0004] Dental implantation involves fixing metal to the alveolar bone and using a crown made of dental restorative materials to repair the portion protruding above the gum line. This method is becoming increasingly popular in dental treatment. A dental implant mainly consists of three parts: the crown, the abutment, and the implant itself, all connected by cementation and screws. The crown used in implantation can be a temporary or permanent prosthesis, used to prevent functional and aesthetic problems before the final permanent prosthesis is attached after the implant is placed. One drawback of this method is its relatively long treatment time.

[0005] On the other hand, the applicant had previously worked on manufacturing crystallized glass blocks connected to superstructures and filed a patent application for this purpose, which was subsequently granted (Korean Patent No. 10-1796196). This patent discloses the following methods: when fabricating artificial teeth using crystallized glass blocks as denture materials via CAD / CAM processing, a method for bonding high-strength zirconia posts capable of functioning as the core to the interior of the crystallized glass block; and a method for bonding a metal ring fastened to a dental implant to the zirconia post, etc. Specifically, it requires a step of bonding the zirconia post by heat-treating it at 700°C to 900°C for 1 to 2 hours using an inorganic adhesive. Summary of the Invention

[0006] Technical issues

[0007] This invention aims to provide an integrated abutment restoration block for cutting and machining, which can be processed by cutting and machining such as CAD / CAM in a state where the crown and abutment are integrated. Artificial teeth such as temporary or permanent dentures can be made by cutting and machining in the block state, and no further heat treatment is required after cutting and machining, thus shortening the treatment time of dental implant restoration and enabling single-day restoration surgery.

[0008] Technical solution

[0009] One embodiment of the present invention provides an integrated abutment restoration block for machining. This integrated abutment restoration block is a dental restoration block for machining where a crown block made of material that does not require heat treatment after machining is integrally formed with the abutment. The integration is achieved through an adhesive layer containing a cured polymeric organic compound. The cured compound contains at least one inorganic filler selected from barium silicate (BaO3Si) and silicon dioxide (SiO2) dispersed within an organic matrix. The organic matrix consists of (a) two or more compounds selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), and diurethane dimethacrylate (UDMA) and (b) hydroxyethyl methacrylate (2-Hydroxyethyl...). It is a cured product of two or more compounds selected from methacrylate (HEMA), bis[2-[(2-methyl-1-oxoallyl)oxy]ethyl]dihydrogen benzene-1,2,4,5-tetracarboxylate (PMDM), and 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP).

[0010] In a preferred embodiment, (a) the compound may be a mixture of triethylene glycol dimethacrylate and at least one compound selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane and urethanedimethacrylate (UDMA).

[0011] In a preferred embodiment, the crown block of the material that does not require heat treatment after machining may contain at least one material selected from polymethyl methacrylate (PMMA), ceramic-resin composites, zirconium oxide, and crystallized glass.

[0012] In a preferred embodiment, the ceramic-resin composite material may be selected from hydroxyethyl methacrylate (HEMA), 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), diurethane dimethacrylate (UDMA), urethane dimethacrylate (UDM), biphenyl dimethacrylate (BPDM), n-tolylglycine-glycidylmethacrylate (NTGE), polyethylene glycol dimethacrylate (PEG-DMA), and oligocarbonate dimethacrylate. A solidified product of two or more polymeric organic compounds selected from esters and one or more inorganic substances selected from barium silicate crystalline glass, leucite crystalline glass, alumina, zirconium oxide and vitreous materials.

[0013] In one embodiment of the invention, the base may comprise one or more materials selected from titanium or alloys thereof and zirconium oxide.

[0014] In a preferred embodiment of the present invention, the cured material can be a cured material based on photocuring or thermal curing.

[0015] In a preferred embodiment of the invention, the crown surface or abutment surface adjacent to the bonding layer can be surface treated by acid etching or sandblasting.

[0016] Furthermore, the present invention provides a method for preparing an integrated abutment restoration block for machining, comprising the following steps: Step S1, preparing a crown block of material that does not require heat treatment after machining; Step S2, preparing an abutment; Step S3, machining holes in the crown block according to a preset abutment shape; Step S4, coating the abutment with an adhesive composition containing a polymeric organic compound; Step S5, fastening the abutment coated with the adhesive composition to the machined crown block; Step S6, curing the crown block with the abutment fastened to it to integrate the abutment and the crown block, wherein the adhesive composition containing a polymeric organic compound used comprises: (a) two or more compounds selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane, triethylene glycol dimethacrylate, and diurea dimethacrylate; (b) hydroxyethyl methacrylate (2-hydroxyethyl methacrylate). (c) two or more compounds selected from methacrylate (HEMA), bis[2-[(2-methyl-1-oxoallyl)oxy]ethyl]dihydrogen benzene-1,2,4,5-tetracarboxylate (PMDM), and 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP); and (d) at least one inorganic filler selected from barium silicate (BaO3Si) and silicon dioxide (SiO2); and (d) a photoinitiator or a thermal initiator.

[0017] In a preferred embodiment of the invention, the surface of the crown block that has undergone hole processing in step S3 can be further treated by acid etching or sandblasting.

[0018] In a preferred embodiment of the present invention, the preparation method of the repair block can be carried out by surface treatment of the base surface by acid etching or sandblasting in step S4, and then an adhesive composition containing a polymeric organic compound can be coated on it.

[0019] In one embodiment of the present invention, step S6 can be performed by photocuring at a wavelength of 350 nm to 450 nm or by thermocuring at a temperature of 80 to 150 °C.

[0020] Furthermore, the present invention provides an abutment-integrated artificial tooth, which is obtained by CAD / CAM machining or laser milling of an abutment-integrated repair block for cutting and machining as described in one embodiment above.

[0021] Here, artificial teeth can be temporary or permanent dentures.

[0022] Beneficial effects

[0023] The integrated abutment restoration block of the present invention can be subjected to rigorous machining processes such as CAD / CAM cutting in a block state in which the abutment and crown are integrated. It can be used to make artificial teeth such as temporary or permanent dentures suitable for individual patients. After cutting, no further heat treatment is required. After cutting, the crown integrated with the abutment is implanted to complete the dental implant surgery, thereby shortening the treatment time of dental implant restoration and enabling single-day restoration surgery. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an integrated repair block for machining. Detailed Implementation

[0025] The present invention will now be described in more detail with reference to the accompanying drawings.

[0026] The foregoing and further aspects of the present invention will be further clearly described through the preferred embodiments illustrated in conjunction with the accompanying drawings. These embodiments will be described in detail below to enable those skilled in the art to readily understand and reproduce them.

[0027] A completed dental implant procedure typically consists of the implant body, abutment, and crown. After the implant is embedded in the alveolar bone, it adheres to the bone over time and provides support. The abutment is the part that connects to the implant and links the implant to the crown, which functions as a tooth; it is usually attached to the crown using cementation. The procedure is usually performed in several stages and takes a considerable amount of time.

[0028] Figure 1 This is a schematic diagram of the integrated abutment restoration block of the present invention for machining. The integrated abutment restoration block is a dental restoration block for machining formed by the crown block 1 and the abutment 2 of the material that does not require heat treatment after machining. The integration is achieved by the bonding layer 4 containing a curing material of polymeric organic compound.

[0029] Considering the eventual need to connect the implant, the repair block includes a screw path 3 and a mandrel 5 for machining purposes.

[0030] In order to integrate the base 2 of various materials with the crown block 1 of materials that do not require heat treatment after machining, and to perform machining processes such as CAD / CAM machining or laser milling in this state, the integration method and materials play an important role.

[0031] In this respect, preferably, the adhesive layer contains a cured polymeric organic compound. That is, preferably, the abutment 2 and the crown block 1 are integrated by utilizing the curing reaction of the polymeric organic compound. In particular, at this time, the bonding that overcomes the material differences between the abutment 2 and the crown block 1 can be achieved according to the chemical composition of the cured material. Specifically, the cured material contains at least one inorganic filler selected from barium silicate (BaO3Si) and silicon dioxide (SiO2) dispersed in an organic matrix, which is formed by (a) two or more compounds selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane, triethylene glycol dimethacrylate and diurea dimethacrylate and (b) two or more compounds selected from hydroxyethyl methacrylate, bis[2-[(2-methyl-1-oxoallyl)oxy]ethyl]dihydrophenyl-1,2,4,5-tetracarboxylic acid ester and 10-methacryloyloxydecane dihydrophosphate.

[0032] Here, (a) is an organic compound that exhibits adhesiveness applicable to various materials, preferably a mixture of low-viscosity and high-viscosity compounds, specifically, a mixture of triethylene glycol dimethacrylate (TEGDMA) and at least one compound selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane and urethanedimethacrylate (UDMA).

[0033] The compound described in (b) can serve as an adhesive compound that enhances the bonding strength of various materials.

[0034] Furthermore, in order to improve the physical properties of the adhesive layer, it is preferable that the inorganic filler contains at least one compound of barium silicate (BaO3Si) and silicon dioxide (SiO2) to improve the adhesion between organic and inorganic materials.

[0035] At this point, regarding the bonding layer 4, the content of organic matrix and inorganic filler, the mixing ratio between compound (a) and compound (b) used to form the organic matrix, and other factors can be appropriately adjusted according to the material of the crown block and the material of the abutment.

[0036] Regarding the adhesive layer as described above, the cured material can be a photocurable or thermocurable material.

[0037] In the integral abutment restoration block of the present invention for machining, preferably, the crown block 1 is formed of a material that does not require heat treatment after machining. This is because if a material that has been machined to a predetermined shape in a block state and then subjected to further heat treatment to achieve the desired physical properties is subjected to further heat treatment, its dimensions will change during the further heat treatment process, which is a problem that needs to be solved. In this respect, preferably, the crown block of the restoration block of the present invention comprises at least one material selected from polymethyl methacrylate (PMMA), ceramic-resin composite materials, zirconium oxide, and crystallized glass. In particular, the crystallized glass is preferably a crystallized glass containing lithium pyrosilicate crystals as the main crystal and capable of being machined.

[0038] Here, PMMA polymers, with their lower physical properties than other materials, are generally suitable for use as temporary prosthesis blocks. Temporary prostheses are implanted in the mouth after dental implantation, before permanent prosthetic restorations are used. They can be used to check the fixation of the implant and periodontal portion after implantation, whether the patient experiences pain during chewing, and can also serve an aesthetic function before the fabrication of permanent prosthetic restorations. Ceramic-resin composites, zirconia, or crystallized glass have higher physical properties than PMMA polymers, and therefore can be used to fabricate crown blocks that can be used as permanent prosthetic restorations.

[0039] More specifically, the ceramic-resin composite material can be a cured product of two or more polymerizable organic compounds selected from hydroxyethylmethacrylate (HEMA), 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), diurethane dimethacrylate (UDMA), urethane dimethacrylate (UDM), biphenyl dimethacrylate, n-tolueneglycine-glycidyl methacrylate, polyethylene glycol dimethacrylate, and oligocarbonate dimethacrylate, and one or more inorganic substances selected from barium silicate crystallized glass, leucite crystallized glass, alumina, zirconium oxide, and vitreous materials. This ceramic-resin composite material is a material suitable for use with anterior teeth and small molars. For details, please refer to the contents of the applicant's Korean Patent Publication No. 10-2017-0173152.

[0040] Regarding the material of the crown block 1, preferably, the zirconium oxide contains 2 to 10 mol% yttrium oxide, which can be applied immediately after machining without further heat treatment, and is therefore generally applicable to posterior teeth requiring high physical properties.

[0041] On the other hand, in the integrated base repair block for machining according to the present invention, the present invention does not limit the material of the base 2. As an example, it may be one or more materials selected from titanium or alloys thereof and zirconium oxide.

[0042] When the abutment 2 formed of the aforementioned material is integrated with the crown block 1 through the adhesive layer 4 containing a cured polymeric organic compound, in order to improve the interlayer adhesion, preferably, the crown surface or abutment surface adjacent to the adhesive layer 4 is surface treated by acid etching or sand blasting.

[0043] The method for preparing an integrated abutment restoration block for machining, as described above, includes the following steps: Step S1, preparing a crown block of material that does not require heat treatment after machining; Step S2, preparing an abutment; Step S3, machining holes in the crown block according to a preset abutment shape; Step S4, coating the abutment with an adhesive composition containing a polymeric organic compound; Step S5, fastening the abutment coated with the adhesive composition to the machined crown block; Step S6, curing the crown block fastened to the abutment to integrate the abutment and the crown block.

[0044] Preferably, the adhesive composition comprising a polymerizable organic compound used here comprises: (a) two or more compounds selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane, triethylene glycol dimethacrylate, and diurea dimethacrylate; (b) two or more compounds selected from hydroxyethyl methacrylate, bis[2-[(2-methyl-1-oxoallyl)oxy]ethyl]dihydrophenyl-1,2,4,5-tetracarboxylic acid ester, and 10-methacryloyloxydecane dihydrophosphate; (c) at least one inorganic filler selected from barium silicate and silicon dioxide; and (d) a photoinitiator or a thermal initiator.

[0045] Here, compounds (a), (b) and (c) are as described above.

[0046] Preferably, (d) the photoinitiator is a compound or polymerization initiation system that initiates curing at a wavelength of 350 to 450 nm. As an example, it may be a photoinitiator such as camphorquinone (CQ), and may contain one or more photosensitizers selected from 1-phenyl-1,2-propanedione (PPD), diphenyliodonium hexafluorophosphate (DPIHP), and p-octyloxy-phenyl-phenyliodonium hexafluoroantimonate (OPPI). It may be a photopolymerization initiation system, and the catalyst includes a tertiary amine such as a relatively hydrophilic aromatic ethyl-4-dimethylaminobenzoate (EDMAB) or a hydrophilic aliphatic dimethylaminoethyl methacrylate (DMAEMA).

[0047] On the other hand, preferably, the thermal initiator can be thermo-cured at 80 to 150°C. For example, it may include a peroxide-based initiator such as benzoyl peroxide (BPO).

[0048] In step S1, where the crown block is made of material that does not require heat treatment after machining, the materials related to the crown block 1 are as described above. At this time, the crown block can be loaded with a mandrel (5).

[0049] Furthermore, in step S2 of preparing the base, the materials related to the base 2 are as described above.

[0050] Step S3 involves drilling holes in the prepared crown block according to a pre-defined abutment shape. The holes are drilled according to the structure so that the abutment is adhered to the crown block 1, which is typically made in the interior, including the mandrel (5). Here, "according to a pre-defined abutment shape" can be understood as including the structure of the screw path 3 for connecting to the implant, taking into account the final placement of the restoration.

[0051] Preferably, the surface of the crown block or the abutment adjacent to the adhesive layer 4 is a surface treatment layer as described above. In this respect, preferably, the surface of the crown block that has undergone hole processing in step S3 is surface treated by acid etching or sandblasting and then fastened to the abutment 2 coated with an adhesive composition.

[0052] On the other hand, preferably, for the same reason, in step S4 of coating the substrate with an adhesive composition containing a polymeric organic compound, the substrate surface can be surface-treated by acid etching or sandblasting before coating it with the adhesive composition containing a polymeric organic compound.

[0053] In this case, preferably, surface treatment is performed in both steps S3 and S4, or only in one of them.

[0054] After step S5, which involves fastening the abutment coated with the adhesive composition to the tooth crown block with holes as described above, step S6 includes curing the tooth crown block with the fastened abutment to integrate the abutment and the tooth crown block.

[0055] As described above, the abutment and crown block achieve integration through a simultaneous curing reaction, which effectively improves interlayer bonding strength.

[0056] In this case, preferably, step S6 is performed by photocuring at a wavelength of 350 nm to 450 nm or by thermocuring at 80 to 150 °C.

[0057] Based on the preparation method described above, the crown block 1 of various materials and the abutment 2 of various materials can be integrated through the curing reaction of a specific polymeric organic compound without the need for harsh heat treatment. This can be achieved through a relatively mild process, thereby eliminating potential problems such as changes in the physical properties of the crown block material.

[0058] Furthermore, the abutment-integrated restoration block obtained by the method described above can be directly manufactured into an abutment-integrated artificial tooth by CAD / CAM processing or laser milling according to the patient's needs. When directly connected to the implant, it can shorten the treatment time of implant restoration, thereby enabling single-day implant surgery.

[0059] In particular, when the restoration block is integrated with the abutment, it can maintain excellent bonding strength and shear strength during cutting processes such as CAD / CAM machining or laser milling, thus ensuring mechanical stability. The integration of the abutment and crown can further reduce the possibility of secondary infection caused by bacterial invasion during individual surgeries.

[0060] As mentioned above, artificial teeth obtained by machining an integrated abutment restoration block can become temporary or permanent dentures depending on the material of the crown block.

[0061] The present invention has been described above with reference to an embodiment shown in the accompanying drawings, but this is merely an illustration, and those skilled in the art can implement various modifications and other equivalent embodiments thereto.

[0062] Industrial applicability

[0063] This invention relates to an integrated abutment restorative block for machining, providing a dental restorative block that integrates a crown block made of material that does not require heat treatment after machining with an abutment, and can be applied in an integrated state to machining processes such as CAD / CAM.

[0064] The integrated abutment restoration block of the present invention can be subjected to rigorous machining processes such as CAD / CAM cutting in a block state in which the abutment and crown are integrated. It can be used to make artificial teeth such as temporary or permanent dentures suitable for individual patients. After cutting, no further heat treatment is required. After cutting, the crown integrated with the abutment is implanted to complete the dental implant surgery, thereby shortening the treatment time of dental implant restoration and enabling single-day restoration surgery.

Claims

1. A method for preparing an integral repair block for machining, characterized in that, Includes the following steps: Step S1: Prepare the crown block; Step S2, prepare the base; Step S3: Machine holes in the crown block according to the preset abutment shape; Step S4: Apply an adhesive composition containing a polymerizable organic compound to the substrate; Step S5: Secure the abutment coated with the adhesive composition to the tooth crown block that has undergone hole machining; Step S6: The crown block with the fixed abutment is solidified to make the abutment and crown block integrated. The crown block is made of at least one material selected from polymethyl methacrylate polymers, ceramic-resin composites, zirconium oxide, and crystallized glass. The crown block is not subjected to any heat treatment after processing. The base comprises one or more materials selected from titanium, titanium alloys, and zirconium oxide. The adhesive composition containing polymerizable organic compounds used comprises: (a) two or more compounds selected from 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane, triethylene glycol dimethacrylate, and diurea dimethacrylate; (b) two or more compounds selected from hydroxyethyl methacrylate, bis[2-[(2-methyl-1-oxoallyl)oxy]ethyl]dihydrophenyl-1,2,4,5-tetracarboxylic acid ester, and 10-methacryloyloxydecane dihydrophosphate; (c) at least one inorganic filler selected from barium silicate and silicon dioxide; and (d) a photoinitiator or a thermal initiator.

2. The method for preparing the integral repair block for machining abutment according to claim 1, characterized in that, The surface of the crown block that has undergone hole machining in step S3 is further subjected to surface treatment using acid etching or sandblasting.

3. The method for preparing the integral repair block for machining abutment according to claim 1, characterized in that, In step S4, after surface treatment of the substrate surface by acid etching or sandblasting, an adhesive composition containing polymeric organic compounds is coated onto it.

4. The method for preparing the integral repair block for machining abutment according to claim 1, characterized in that, Step S6 is performed by photocuring at a wavelength of 350 nm to 450 nm.

5. The method for preparing the integral repair block for machining abutment according to claim 1, characterized in that, Step S6 is performed by thermosetting at 80 to 150°C.

6. A type of artificial tooth with an integrated abutment, characterized in that, The abutment-integrated artificial tooth is obtained by CAD / CAM machining or laser milling of the abutment-integrated restoration block for cutting obtained by the method according to claim 1.

7. The abutment-integrated artificial tooth according to claim 6, characterized in that, Artificial teeth are either temporary or permanent dentures.

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