Maryland bridge wing plate and manufacturing method thereof

Abstract

The invention relates to a Maryland bridge wing plate and a manufacturing method thereof.The Maryland bridge wing plate is arranged on the two sides of a false tooth, the false tooth is installed in the oral cavity of a patient by bonding the Maryland bridge wing plate and the true tooth of the patient, the Maryland bridge wing plate comprises a wing plate base body, the wing plate base body comprises a bonding face on the inner side and an outer side face, and the bonding face is arranged on the outer side face. The outer side surface is wrapped with an appearance layer, and the bonding surface is one surface bonded with true teeth of a patient; the bonding surface is provided with lines, and the lines are concave lines and / or convex lines; the transmissivity of the appearance layer is higher than that of the wing plate base body. The Maryland bridge wing plate provided by the invention is easy to bond and not easy to fall off.

Description

Technical Field

[0001] The invention relates to the technical field of oral prostheses, and in particular to a Maryland bridge wing plate and a manufacturing method thereof. Background Art

[0002] The Maryland bridge (also known as the bonded bridge) occupies an important position in the field of oral restoration with its design concept of non-molar or low-molar teeth. Traditional Maryland bridges are made of a variety of materials, such as thin metal materials, composite resins, polymer porcelain, zirconium oxide, high-performance polymers (HPP) and glass fibers. The selection of these materials aims to balance aesthetic effects, biocompatibility, mechanical strength and cost-effectiveness. The Maryland bridge avoids the large-scale removal of healthy adjacent tooth tissue, reduces the pain and fear of patients, while maintaining a high degree of aesthetics and comfort. It does not require daily removal and wear, providing patients with a semi-permanent fixed restoration solution. In addition, its semi-reversible design allows re-bonding or conversion to other restoration methods after bonding failure, and it also has a certain periodontal splinting effect on some loose teeth.

[0003] However, despite the many advantages of the Maryland bridge, its existing structural design still has limitations. The traditional Maryland bridge relies on two independent wings for bonding and retention. The bonding area is limited to the lingual side of the teeth. The limited bonding area increases the sensitivity of the bonding technology. Physicians must strictly follow the complex bonding process to ensure the stability of the denture and prevent it from falling off. For the Maryland bridge made of metal materials, it was found that opening holes in its metal wings can improve the bonding firmness to a certain extent, but the exposure of the metal base will lead to insufficient aesthetics of the patient's oral restoration.

[0004] Therefore, it is urgent to develop a new Maryland bridge wing to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a Maryland bridge wing plate and a manufacturing method thereof, so as to solve the problem that the Maryland bridge in the prior art has low bonding strength and is easy to fall off.

[0006] To achieve the above object, a first aspect of the present invention provides a Maryland bridge wing plate, wherein the Maryland bridge wing plate is arranged on both sides of the denture, and the denture is installed in the patient's oral cavity by bonding the Maryland bridge wing plate to the patient's real teeth.

[0007] The Maryland bridge wing plate includes a wing plate substrate, which includes an inner bonding surface and an outer surface, the outer surface is wrapped with an appearance layer, and the bonding surface is the side that bonds to the patient's real teeth; the bonding surface is provided with textures, and the textures are concave textures and / or convex textures; the transmittance of the appearance layer is higher than the transmittance of the wing plate substrate.

[0008] Furthermore, the thickness of the Maryland bridge wing plate ranges from 0.3 to 1 cm.

[0009] Furthermore, the thickness of the wing plate substrate ranges from 0.2 to 0.9 cm, and the thickness of the appearance layer ranges from 0.1 to 0.8 cm.

[0010] Furthermore, the material of the wing plate substrate is zirconium oxide; the material of the appearance layer is high-transmittance zirconium oxide, and the high-transmittance zirconium oxide is a mixture of yttrium oxide and zirconium oxide.

[0011] Furthermore, the texture is a continuous line texture, the protrusion or depression depth of the texture is 10 μm to 30 μm, the width of the texture is 50 μm to 100 μm, and the spacing between two adjacent textures is 100 μm to 200 μm.

[0012] Furthermore, the texture is a discontinuous pattern texture, and the pattern adopted by the discontinuous pattern texture includes at least one of a star, a dot, a hexagon, a triangle, a square, and a slash. The protrusion or depression depth of the pattern is 10μm to 30μm, the width of the pattern is 50μm to 100μm, and the spacing between two adjacent patterns is 100μm to 200μm.

[0013] Furthermore, the zirconium oxide material of the wing plate substrate is doped with a preset colorant, and the colorant includes one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate; and the exterior layer is coated with a glaze layer.

[0014] A second aspect of the present invention provides a method for manufacturing a Maryland bridge wing plate, the manufacturing method comprising:

[0015] Obtaining the initial three-dimensional structure of the Maryland bridge wing for the patient's denture installation;

[0016] The initial three-dimensional structure is configured, and a wing plate substrate and an appearance layer are divided from the initial three-dimensional structure, wherein the wing plate substrate includes an inner bonding surface and an outer side surface, the outer side surface is wrapped with the appearance layer, and the bonding surface is provided with a texture, and the texture is a concave texture and / or a convex texture, so as to obtain the configured three-dimensional structure of the Maryland bridge wing plate;

[0017] Setting a protective layer of a preset thickness on the outer contour of the three-dimensional structure of the Maryland bridge wing plate to obtain printing three-dimensional structure data;

[0018] Prepare a first ink for printing the wing plate substrate, prepare a second ink for printing the appearance layer, and prepare a supporting material ink for printing the protective layer;

[0019] The first ink, the second ink and the supporting material ink are loaded into a 3D printer, and 3D printing is performed according to the printed three-dimensional structure data to obtain a green embryo;

[0020] The green body is cleaned to remove the protective layer, and then degreased and sintered to obtain the Maryland bridge wing plate.

[0021] Further, the first ink comprises 30-60 wt % of tetragonal zirconium oxide, 30-60 wt % of ethylene glycol and 10-20 wt % of a first dispersant;

[0022] The second ink comprises 30-60 wt% of high-permeability zirconium oxide, 30-60 wt% of ethylene glycol and 10-20 wt% of a second dispersant, wherein the high-permeability zirconium oxide is a mixture of yttrium oxide and zirconium oxide;

[0023] The supporting material ink comprises 30-50 wt % of sodium carbonate, 40-60 wt % of ethylene glycol and 10-20 wt % of a third dispersant.

[0024] Furthermore, the 3D printer includes three primary ink barrels and three secondary ink barrels, and the step of loading the first ink, the second ink and the support material ink into the 3D printer, and performing 3D printing according to the printed three-dimensional structure data to obtain a green embryo includes:

[0025] The first ink, the second ink and the support material ink are respectively loaded into three primary ink barrels of the 3D printer, and each of the first ink barrels is in a continuous stirring state;

[0026] Controlling to gradually introduce the first ink, the second ink and the supporting material ink from the three primary ink barrels into the three secondary ink barrels respectively;

[0027] In a secondary ink barrel corresponding to the first ink, a dye is added to the first ink to dye it, so as to obtain a first dye ink, wherein the type and content of the dye are determined according to a preset dye color number of the Maryland bridge wing plate, wherein the dye comprises one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate, and the concentration range of each dye in the first ink is 0.1 to 0.8 mol / L;

[0028] According to the printed three-dimensional structure data, the print head of the 3D printer is controlled to print layer by layer, and the first dye ink, the second ink and the support material ink are correspondingly sprayed according to the structural distribution of each layer. After completing 3D printing, the green embryo is obtained.

[0029] The Maryland bridge wing plate and the manufacturing method thereof provided by the present invention have the following beneficial effects:

[0030] The Maryland bridge wing plate of the present invention can increase the contact area between the bonding surface and the patient's real teeth by providing textures on the bonding surface, and can also improve the uniformity of the adhesive distribution on the bonding surface, thereby improving the bonding strength between the Maryland bridge wing plate and the patient's real teeth and reducing the risk of falling off. The outer side of the wing plate substrate is wrapped with an appearance layer with a transmittance higher than that of the wing plate substrate, and the appearance layer can simulate the color and transparency of natural teeth, thereby improving the aesthetics of the patient's oral cavity after restoration.

[0031] The Maryland bridge wing plate of the present invention is made by 3D printing technology. By accurately controlling the printing process, the production of the wing plate substrate and the appearance layer can be completed at one time, and the wing plate bonding surface can be directly printed with multiple patterns. The operation is simple and does not require traditional processing sandblasting or acid etching, thus avoiding mechanical damage caused by sandblasting or acid etching. At the same time, the ultra-thin Maryland bridge wing plate achieved by printing one-piece molding has no mechanical stress residual from mechanical processing, and its strength is better than die casting and cutting, and it is not easy to be damaged during clinical tooth wearing. The manufacturing method of the present invention can realize the mass production of Maryland bridge wing plates without the need for subsequent complex processing steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the structure of the Maryland Bridge in one embodiment;

[0033] Figure 2 A schematic diagram of bonding of a Maryland bridge wing plate in one embodiment;

[0034] Figure 3 is a cross-sectional schematic diagram of a Maryland bridge wing plate in one embodiment;

[0035] Figure 4 Schematic diagram of the texture of the Maryland bridge wing plate in one embodiment; (a) is continuous oblique stripes, and (b) is continuous vertical stripes;

[0036] Figure 5 Schematic diagram of the texture of the Maryland bridge wing plate in one embodiment; (a) is a triangular pattern, (b) is a dot pattern, (c) is a square pattern, and (d) is a hexagonal pattern;

[0037] Figure 6 The figure is a schematic flow chart of a method for manufacturing a Maryland bridge wing plate in one embodiment.

[0038] Figure Number:

[0039] 1: wing plate; 11: wing plate base; 111: bonding surface; 112: outer surface; 113: texture; 1131: pattern; 12: appearance layer; 2: denture; 3: real tooth; 4: bonding layer.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0044] Reference Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention discloses a Maryland bridge wing plate, wherein the Maryland bridge wing plate 1 is arranged on both sides of a denture 2, and the denture 2 is installed in the patient's oral cavity by bonding the Maryland bridge wing plate 1 to the patient's natural teeth 3. The Maryland bridge wing plate 1 includes a wing plate substrate 11, and the wing plate substrate 11 includes an inner bonding surface 111 and an outer surface 112, and the outer surface 112 is wrapped with an appearance layer 12, and the bonding surface 111 is a surface bonded to the patient's natural teeth 3; the bonding surface 111 is provided with a texture 113, and the texture 113 is a concave texture and / or a convex texture; the transmittance of the appearance layer 12 is higher than the transmittance of the wing plate substrate 11.

[0045] In this embodiment, the wing plate substrate 11 of the Maryland bridge wing plate 1 is made of a material with high strength and good biocompatibility, such as titanium alloy, cobalt-chromium alloy, zirconium oxide ceramics, etc. The wing plate substrate 11 has two opposite surfaces, namely the inner bonding surface 111 and the outer side surface 112. The bonding surface 111 directly contacts and bonds with the patient's real teeth 3. In order to ensure a good bonding effect, a texture 113 is provided on the bonding surface 111, which can be a concave texture, a convex texture or a combination of the two. The texture 113 is used to increase the bonding area, improve the bonding strength, and help the uniform distribution of the adhesive during the bonding process, thereby ensuring the firmness and stability of the bonding between the Maryland bridge wing plate 1 and the patient's real teeth 3. The outer side surface 112 is the outer surface of the wing plate substrate 11, and the appearance layer 12 is a layer of material wrapped on the outer side surface 112 of the wing plate substrate 11, which can be made of a resin with high light transmittance, a high-transmittance zirconium oxide, and other materials. The transmittance of the appearance layer 12 is higher than that of the wing plate substrate 11 , so that the Maryland bridge wing plate 1 can present a more natural and beautiful appearance in the oral cavity.

[0046] The Maryland bridge wing plate 1 of the embodiment of the present invention achieves a stable installation and beautiful appearance of the denture 2 in the oral cavity by optimizing the design of the bonding surface 111 and combining the high-transmittance appearance layer 12 .

[0047] In a specific embodiment, the thickness of the Maryland bridge wing plate 1 ranges from 0.3 to 1 cm.

[0048] In this embodiment, the Maryland bridge wing plate 1 in the above-mentioned thickness range can ensure that the wing plate 1 has sufficient mechanical strength to withstand the chewing pressure and daily wear in the oral cavity. In addition, the ultra-thin thickness allows doctors to achieve minimal tooth preparation during clinical tooth preparation, or even no tooth preparation is required in some cases, thereby achieving minimally invasive repair. In addition, the thinner wing plate 1 is also easier to achieve a high light transmittance of the appearance layer 12, thereby improving the aesthetic effect. In the actual production process, the ultra-thin Maryland bridge wing plate 1 can be prepared by a 3D printing method.

[0049] In a specific embodiment, the thickness of the wing panel substrate 11 is in the range of 0.2 to 0.9 cm, and the thickness of the appearance layer 12 is in the range of 0.1 to 0.8 cm.

[0050] In this embodiment, the wing plate base 11 serves as the main bearing structure of the Maryland bridge wing plate 1. The thickness within the above range can ensure that the wing plate base 11 is not easily deformed or damaged when subjected to chewing pressure and daily wear in the oral cavity, thereby ensuring that it has sufficient mechanical strength and durability.

[0051] The thickness of the appearance layer 12 within the above range can ensure that the appearance layer 12 has sufficient light transmittance, so that the Maryland bridge wing plate 1 presents a more natural and realistic appearance in the oral cavity.

[0052] In a specific embodiment, the material of the wing plate substrate 11 is zirconium oxide; the material of the appearance layer 12 is high-transmittance zirconium oxide, and the high-transmittance zirconium oxide is a mixture of yttrium oxide and zirconium oxide.

[0053] In this embodiment, zirconium oxide is a ceramic material with high strength, high hardness and good biocompatibility. It can withstand the chewing pressure and daily wear in the oral cavity, and can also maintain good compatibility with the patient's oral tissue to reduce irritation and rejection. Therefore, the density of the zirconium oxide layer is as high as 6.05g / cm 3 , ensuring the high strength characteristics of the wing panel matrix 11.

[0054] High-transmittance zirconium oxide is a special ceramic material made by adding an appropriate amount of yttria to zirconium oxide. In a specific embodiment, high-transmittance zirconium oxide is a mixture of yttria and zirconium oxide, wherein the molar ratio of the two is yttria: zirconium oxide = (5-8): (92-95). High-transmittance zirconium oxide maintains the high strength and biocompatibility of zirconium oxide, and also has a transmittance of up to 55-70%, presenting the aesthetic texture of ceramics, thereby being able to simulate the gloss and transparency of natural teeth, and improving the aesthetic effect of the Maryland bridge wing plate 1.

[0055] In a specific embodiment, referring to Figure 4 The lines 113 are continuous line lines, the protrusion or depression depth of the lines 113 is 10 μm to 30 μm, the width of the lines 113 is 50 μm to 100 μm, and the spacing between two adjacent lines 113 is 100 μm to 200 μm.

[0056] In this embodiment, the protrusion or depression depth of the above-mentioned lines 113 is controlled within the range of 10μm to 30μm. Too shallow lines 113 cannot provide sufficient effect of enhancing bonding contact, while too deep lines 113 may increase the difficulty of adhesive penetration and affect the bonding effect. Too deep lines 113 will also increase the thickness of the Maryland bridge wing plate 1. The width of the above-mentioned lines 113 is set to 50μm to 100μm and the spacing is controlled within the range of 100μm to 200μm to ensure that the lines 113 have sufficient distribution density and suitable bonding area on the bonding surface 111, while avoiding the reduction of bonding strength caused by too wide lines 113.

[0057] In a specific embodiment, referring to Figure 5The texture 113 is a discontinuous pattern texture. The pattern 1131 used in the discontinuous pattern texture includes at least one of a star, a dot, a hexagon, a triangle, a square, and a slash. The protrusion or depression depth of the pattern 1131 is 10μm to 30μm, the width of the pattern 1131 is 50μm to 100μm, and the spacing between two adjacent patterns 1131 is 100μm to 200μm.

[0058] In this embodiment, the selection of the above-mentioned pattern 1131 can ensure that the pattern 1131 has a certain bonding area to further improve the bonding effect. The protrusion or depression depth of the pattern 1131 is controlled within the range of 10μm to 30μm. The selection of this depth range is intended to ensure that the pattern 1131 can provide sufficient effect to increase the bonding contact area, while avoiding the increase in the difficulty of adhesive penetration caused by the too deep pattern 1131, and avoiding the increase in the thickness of the Maryland Bridge wing 1. The width of the pattern 1131 is set to 50μm to 100μm to ensure that the pattern 1131 has a sufficient bonding area on the bonding surface 111, while avoiding the reduction in bonding strength caused by the too wide pattern 1131. The spacing between two adjacent patterns 1131 is controlled within the range of 100μm to 200μm to ensure the independence between the patterns 1131, increase the bonding contact area, and ensure the uniform distribution of the adhesive between the patterns 1131, further improving the bonding effect.

[0059] In a specific embodiment, the zirconium oxide material of the wing plate substrate 11 is doped with a preset colorant, and the colorant includes one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate; the appearance layer 12 is coated with a glaze layer (not shown in the drawings).

[0060] In this embodiment, a preset dye is doped into the zirconium oxide material of the wing plate substrate 11 for dyeing, so that the color of the Maryland bridge wing plate 1 is close to the patient's tooth color. The above-mentioned dyes each have unique color characteristics and can give the zirconium oxide material different color effects. Among them, erbium nitrate can make the zirconium oxide material present a pink or red tone; neodymium nitrate can make the zirconium oxide material present a purple or bluish purple tone; praseodymium nitrate can make the zirconium oxide material present a light green or yellow-green tone; iron nitrate can make the zirconium oxide material present a gray or black tone. In actual operation, the doping amount, type and combination of dyes can be customized according to the patient's tooth color and restoration needs. By precisely controlling the doping process of the dye, it can be ensured that the wing plate substrate 11 presents the expected color effect after sintering.

[0061] In order to further enhance the glossiness and wear resistance of the Maryland Bridge wing 1, a layer of glaze is applied on the outer surface of the appearance layer 12, which not only protects the appearance layer 12 from daily wear and corrosion, but also improves the overall aesthetics and texture of the wing 1. The glaze material uses a dental glaze liquid. When applying the glaze, a dye pen is used to evenly apply the glaze on the outer surface of the appearance layer 12. After the application, a sintering process is performed to make the glaze layer and the appearance layer 12 tightly bonded and solidified.

[0062] The Maryland bridge wing plate 1 of the embodiment of the present invention can increase the contact area between the bonding surface 111 and the patient's natural teeth 3 by providing the lines 113 on the bonding surface 111, and can also improve the uniformity of the adhesive distribution on the bonding surface 111, thereby improving the bonding strength between the Maryland bridge wing plate 1 and the patient's natural teeth 3 and reducing the risk of falling off. The outer side surface 112 of the wing plate substrate 11 is wrapped with an appearance layer 12 with a transmittance higher than that of the wing plate substrate 11, and the appearance layer 12 can simulate the color and transparency of natural teeth, thereby improving the aesthetics of the patient's oral cavity after restoration.

[0063] Reference Figure 6 The embodiment of the present invention further discloses a method for manufacturing the aforementioned Maryland bridge wing plate, the manufacturing method comprising:

[0064] S1, obtaining an initial three-dimensional structure of a Maryland bridge wing plate for installing a denture 2 of a patient;

[0065] S2, structurally configuring the initial three-dimensional structure, dividing the wing plate substrate 11 and the appearance layer 12 from the initial three-dimensional structure, the wing plate substrate 11 includes an inner bonding surface 111 and an outer side surface 112, the outer side surface 112 wraps the appearance layer 12, the bonding surface 111 is provided with a texture 113, and the texture 113 is a concave texture and / or a convex texture, so as to obtain the configured three-dimensional structure of the Maryland bridge wing plate;

[0066] S3, setting a protective layer of a preset thickness on the outer contour of the three-dimensional structure of the Maryland bridge wing plate to obtain printing three-dimensional structure data;

[0067] S4, preparing a first ink for printing the wing plate substrate 11, preparing a second ink for printing the appearance layer 12, and preparing a supporting material ink for printing the protective layer;

[0068] S5, loading the first ink, the second ink and the supporting material ink into a 3D printer, and performing 3D printing according to the printed three-dimensional structure data to obtain a green embryo;

[0069] S6, cleaning the green body to remove the protective layer, and degreasing and sintering to obtain the Maryland bridge wing plate.

[0070] In this embodiment, in the above step S1, the initial three-dimensional structure of the Maryland bridge wing is created by computer software according to the patient's oral scan data or oral impression.

[0071] Specifically, taking the design of the Maryland Bridge wing slab using 3shape DengtalSystem software as an example, the design process is as follows:

[0072] (1) Open the software: select the corresponding tooth position according to the dental order, and click the corresponding module, for example, select the combination design of dental bridge and Maryland bridge wing plate to establish a design order;

[0073] (2) Import scans: Import the scans of the upper and lower jaw models into the design order respectively;

[0074] (3) Prepare the scan: open the design order, adjust the occlusal plane, trim the model edge, and carve the model;

[0075] (4) Insertion direction confirmation: Set the insertion direction of the Maryland Bridge;

[0076] (5) Set up the interface:

[0077] a. Margin determination: Draw the margin lines of each unit along the clinical preparation shoulder on the model;

[0078] b. Determine adhesive parameters: select the adhesive type of the adhesive layer 4, such as dual-curing resin, cement, etc.; set the adhesive gap of the adhesive layer 4, for example, 0.01-0.03mm, 0.01-0.08mm, etc.

[0079] (6) Anatomical design:

[0080] a. Select anatomical tooth type: select the appropriate anatomical tooth type according to the facial shape in the tooth type database;

[0081] b. Dental arch arrangement: Arrange the tooth shape according to the dental arch and adjust the size, direction and proportion of the tooth shape;

[0082] c. Tooth shape modification: adjust the tooth shape, modify the curvature, size, curve, convexity, high points and adjacent parts of the tooth shape to make the tooth shape coordinated with natural teeth.

[0083] (7) Exporting design data: Save the design form of the Maryland Bridge and export the STL file, which is the initial three-dimensional structure of the Maryland Bridge wing plate mentioned above.

[0084] In the above step S2, after obtaining the initial three-dimensional structure, the structure is configured to divide the wing panel substrate 11 and the appearance layer 12. Specifically, the following method can be used for setting, and the Maryland bridge wing panel STL file of step S1 is set with a recipe, and the recipe is set to select the thickness of the wing panel substrate 11 and the appearance layer 12 of the Maryland bridge wing panel, and to select the dyeing color number of the wing panel substrate 11.

[0085] In a specific embodiment, the thickness of the Maryland bridge wing plate 1 ranges from 0.3 to 1 cm.

[0086] In a specific embodiment, the thickness of the wing panel substrate 11 is in the range of 0.2 to 0.9 cm, and the thickness of the appearance layer 12 is in the range of 0.1 to 0.8 cm.

[0087] In a specific embodiment, the material of the wing plate substrate 11 is zirconium oxide; the material of the appearance layer 12 is high-transmittance zirconium oxide, and the high-transmittance zirconium oxide is a mixture of yttrium oxide and zirconium oxide. In a specific embodiment, the high-transmittance zirconium oxide is a mixture of yttrium oxide and zirconium oxide, wherein the molar ratio of the two is yttrium oxide: zirconium oxide = (5-8): (92-95).

[0088] The texture 113 on the bonding surface 111 can be a continuous line texture, a discontinuous pattern texture, etc. Specifically, the Maryland bridge wing STL file of step S1 can be imported into the magics software to set the texture structure of the bonding surface 111 of the Maryland bridge wing, and set the parameters of the texture 113. In a specific embodiment, refer to Figure 4 , the lines 113 are continuous lines, the protrusion or depression depth of the lines 113 is 10 μm to 30 μm, the width of the lines 113 is 50 μm to 100 μm, and the spacing between two adjacent lines 113 is 100 μm to 200 μm. In another specific embodiment, referring to Figure 5 The texture 113 is a discontinuous pattern texture, and the pattern 1131 used in the discontinuous pattern texture includes at least one of a star, a dot, a hexagon, a triangle, a square, and a slash. The protrusion or depression depth of the pattern 1131 is 10 μm to 30 μm, the width of the pattern 1131 is 50 μm to 100 μm, and the spacing between two adjacent patterns 1131 is 100 μm to 200 μm. After completing the structural configuration, the three-dimensional structure of the Maryland bridge wing plate is obtained.

[0089] In the above step S3, in order to protect the integrity of the Maryland Bridge wing during the 3D printing process, a protective layer of a preset thickness needs to be provided on the outer contour of the three-dimensional structure. This protective layer will prevent deformation or damage caused by insufficient support structure during the printing process. The above preset thickness is, for example, 1 to 2 mm.

[0090] After the setting is successful, the 3shape DengtalSystem software automatically generates a slice pixel bitmap file for the three-dimensional structure to obtain the printed three-dimensional structure data. In a specific embodiment, the transverse slice thickness is 5 to 10 μm. After the slicing is completed, it is packaged and sent to the controller of the 3D printer via the local area network.

[0091] In the above step S4, according to the material and design requirements of the Maryland Bridge wing, a first ink for printing the wing substrate 11, a second ink for printing the appearance layer 12, and a supporting material ink for printing the protective layer are prepared.

[0092] In a specific embodiment,

[0093] The first ink comprises 30-60 wt % of tetragonal zirconium oxide, 30-60 wt % of ethylene glycol and 10-20 wt % of a first dispersant;

[0094] The second ink comprises 30-60 wt% of high-permeability zirconium oxide, 30-60 wt% of ethylene glycol and 10-20 wt% of a second dispersant, wherein the high-permeability zirconium oxide is a mixture of yttrium oxide and zirconium oxide; in a specific embodiment, the high-permeability zirconium oxide is a mixture of yttrium oxide and zirconium oxide, wherein the molar ratio of the two is yttrium oxide: zirconium oxide = (5-8): (92-95);

[0095] The supporting material ink comprises 30-50 wt % of sodium carbonate, 40-60 wt % of ethylene glycol and 10-20 wt % of a third dispersant, wherein the sodium carbonate as the supporting material has the characteristic of being easy to remove.

[0096] The functions of the first dispersant, the second dispersant and the third dispersant are to make the corresponding particles dispersed uniformly in ethylene glycol. The dispersant can be any suitable dispersant in the prior art, such as an ionic polymer dispersant.

[0097] In the above step S5, the prepared first ink, second ink and supporting material ink are loaded into the 3D printer, and 3D printing is performed according to the printed three-dimensional structure data. During the printing process, the 3D printer will print layer by layer according to the slice pixel bitmap to form the embryo of the Maryland Bridge wing plate.

[0098] In a specific embodiment, the 3D printer includes three primary ink barrels and three secondary ink barrels, and the step S5 of loading the first ink, the second ink, and the support material ink into the 3D printer and performing 3D printing according to the printed three-dimensional structure data to obtain a green embryo includes:

[0099] S501, respectively loading the first ink, the second ink and the supporting material ink into three primary ink barrels of a 3D printer, wherein each of the first ink barrels is in a continuous stirring state;

[0100] S502, controlling to gradually inject the first ink, the second ink and the supporting material ink from the three primary ink barrels into the three secondary ink barrels respectively;

[0101] S503, in the secondary ink barrel corresponding to the first ink, adding a dye to the first ink to dye it, so as to obtain a first dyed ink, wherein the type and content of the dye are determined according to the preset dyeing color number of the Maryland bridge wing plate, wherein the dye comprises one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate, and the concentration range of each dye in the first ink is 0.1-0.8 mol / L;

[0102] S504, according to the printed three-dimensional structure data, control the print head of the 3D printer to print layer by layer, and spray the first dye ink, the second ink and the support material ink according to the structural distribution of each layer, and after completing 3D printing, obtain the green embryo.

[0103] The 3D printer used in this embodiment includes three primary ink barrels and three secondary ink barrels. Such a configuration can ensure the simultaneous loading and supply of the first ink, the second ink and the supporting material ink, thereby improving printing efficiency and flexibility.

[0104] In the above step S501, the first ink, the second ink and the supporting material ink are respectively loaded into three primary ink barrels of the 3D printer. The three primary ink barrels are respectively used to load the first ink, the second ink and the supporting material ink. These primary ink barrels are equipped with a continuous stirring device to ensure that the ink remains in a uniform state during the loading and supply process to prevent particle sedimentation or agglomeration. The stirring speed is set to, for example, 150 to 300 rpm.

[0105] In the above step S502, each secondary ink barrel is a primary ink barrel, which is used to receive the ink gradually fed from the primary ink barrel. The first ink, the second ink and the supporting material ink are gradually fed from the three primary ink barrels to the three secondary ink barrels respectively. The feeding process should be smooth and continuous, and the ink supply can be controlled by adjusting the feeding speed to meet the needs of the printing process. Specifically, the liquid feeding amount of the primary ink barrel can be controlled by a liquid level sensor. The function of the secondary ink barrel is to stabilize the pressure and prevent the dyed ink from mixing with the undyed ink.

[0106] In the above step S503, in the secondary ink barrel corresponding to the first ink, a dye is added to the first ink for dyeing. The type and content of the dye should be determined according to the pre-set dyeing color number of the Maryland bridge wing plate. In this embodiment, the dye includes one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate. The concentration range of each dye in the first ink is controlled between 0.1 and 0.8 mol / L to ensure that the dyeing effect is uniform and meets the design requirements. Before printing, the secondary ink barrel containing the first ink will be added with a corresponding color dye according to the set recipe, and the internal dyeing is realized when the wing plate substrate 11 is printed. Since the tooth color of each batch of printing is different, after each printing, the injection system of the 3D printer will start the self-cleaning function, and the cleaning liquid is added to the secondary ink barrel containing the first ink for positive pressure cleaning. After cleaning, the cleaning liquid is discharged to the waste liquid barrel, and the cleaning liquid waste can be used for maintenance.

[0107] In the above step S504, the print head of the 3D printer is controlled to print layer by layer according to the printed three-dimensional structure data. The secondary ink barrel is connected to the piezoelectric print head. The printer has 3 groups of piezoelectric print heads, each group has 6-12 heads, each head has 512 to 1024 nozzles, the nozzle diameter is 50 to 100 μm, and the printing molding accuracy is 0.03 to 0.1 mm. During the printing process, the piezoelectric print head will spray the first dye ink, the second ink and the support material ink according to the distribution of the wing plate substrate 11, the appearance layer 12 and the protective layer in the pixel bitmap file of each layer of the printed three-dimensional structure data.

[0108] Exemplarily, a group of piezoelectric print heads first spray 0.5-1mm support material ink on the printing substrate to form a substrate horizontal to the bottom plate of the piezoelectric print head, and then three groups of piezoelectric print heads spray three kinds of ink on the substrate according to the pixel distribution of each layer of the slice pixel bitmap file. The ink drop volume of the piezoelectric print head is 10-20pl, which can accurately and evenly print and spray layer by layer according to the pixel points corresponding to the first ink, the second ink and the support material ink. During the spraying process, the printing substrate has a constant temperature heating function. There are several constant temperature heating lamps at the same level as the nozzle bottom plate to keep the temperature of the bottom and upper surface of the substrate at 100-200°C, so that the three inks evaporate to obtain a formed embryo. The spray system has a self-maintenance function. After a certain number of layers of printing and spraying, the system automatically pauses printing and enters a short period of maintenance. The maintenance performs a cleaning procedure for the positive pressure filling nozzle to ensure the nozzle through-hole rate and make the material ratio more accurate.

[0109] This embodiment uses 3D printing to directly print and shape a variety of patterns on the wing plate bonding surface 111. It is easy to operate and does not require traditional sandblasting or acid etching treatment, thus avoiding mechanical damage caused by sandblasting or acid etching. At the same time, the ultra-thin Maryland bridge wing plate achieved by integrated printing has a material strength of up to 800Mpa, and there is no residual mechanical stress from machining. Its strength is better than die-casting and cutting, and it is not easy to be damaged during clinical tooth wearing. The thickness of the Maryland bridge wing plate in this embodiment is very thin, comparable to the casting process, but the process is simpler than die-casting, and it can be mass-produced, realizing the printing and production of 800 units of Maryland bridges at a time, and the total time is only 8-10 hours. The ultra-thin thickness of the Maryland bridge wing plate enables doctors to achieve minimal tooth preparation during clinical tooth preparation, and even no tooth preparation is required in some cases, achieving minimally invasive restoration.

[0110] In the above step S6, after printing is completed, the green embryo is taken out of the 3D printer and cleaned to remove the protective layer. The cleaning process should ensure that the support material and residues are completely removed. Subsequently, the cleaned green embryo is degreased to remove organic matter and impurities in the ink. After degreasing, the green embryo is sintered to solidify it and achieve the required strength and hardness. The temperature and atmosphere conditions should be strictly controlled during the sintering process to ensure the quality and performance of the Maryland bridge wing plate.

[0111] Specifically, the steps of the above-mentioned method for removing support materials and degreasing and sintering are as follows: placing the green embryo into a cleaning tank filled with deionized water, the cleaning tank has the functions of constant temperature heating and water flow control, and during the cleaning process, the water temperature is constant at 30-35°C, the water flow rate is 300-1000L / h, and the water-soluble support materials are efficiently removed within 2-5 hours without human intervention, and the quality of the obtained Maryland bridge wing plate products is uniform and stable. The cleaned Maryland bridge wing plate products are placed in a hot blast oven for drying, the temperature is set to 60-90°C, and the holding time is 15-30min. After drying, the Maryland bridge wing blank is placed in a muffle furnace for degreasing. The degreasing process is set as follows: heating from 0°C to 250°C at a rate of 5-10°C / min, with a holding time of 80-150min, heating from 250°C to 450°C at a rate of 5-10°C / min, with a holding time of 100-250min, heating from 450°C to 800°C at a rate of 1-5°C / min, with a holding time of 150-300min. After degreasing, the Maryland bridge wing is sintered by microwave: heating from 0°C to 1000°C at a heating rate of 20-30°C / min, heating from 1000°C to 1350-1550°C at a heating rate of 5-10°C, and holding at 1350-1550°C for 0.5-2h, and finally cooled to obtain the Maryland bridge wing.

[0112] Furthermore, the obtained Maryland bridge wing plate is glazed. Specifically, the dental glaze liquid can be mixed with the glaze powder in the color palette to make it oily, the Maryland bridge wing plate to be glazed is clamped with a clamp, and then the Maryland bridge wing plate to be glazed is stained and brushed with a dyeing pen, the glaze layer coating thickness is 0.05-0.1mm, the cutting end should be transparent, the tooth color of the Maryland bridge wing plate should be consistent with the corresponding color of the color plate, and a layer is evenly applied on its surface, the maximum temperature is 900℃, and it is placed in a porcelain furnace for baking for 15 minutes, and then taken out and naturally cooled to obtain the final glazed Maryland bridge wing plate product.

[0113] The Maryland bridge wing plate of the present invention is manufactured by 3D printing technology. By precisely controlling the printing process, the wing plate substrate 11 and the appearance layer 12 can be manufactured at one time, and the wing plate bonding surface 111 can be directly printed with multiple patterns. The operation is simple and does not require sandblasting or acid etching treatment of traditional processing, thus avoiding mechanical damage caused by sandblasting or acid etching. At the same time, the ultra-thin Maryland bridge wing plate achieved by printing one-piece molding has no residual mechanical stress from mechanical processing, and its strength is better than die casting and cutting, and it is not easy to be damaged during clinical tooth wearing. The manufacturing method of the present invention can realize the mass production of Maryland bridge wing plates without the need for subsequent complex processing steps.

[0114] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A Maryland bridge wing plate, characterized in that: The Maryland bridge wing plates are arranged on both sides of the denture, and the denture is installed in the patient's oral cavity by bonding the Maryland bridge wing plates to the patient's real teeth. The Maryland bridge wing plate includes a wing plate substrate, which includes an inner bonding surface and an outer surface, the outer surface is wrapped with an appearance layer, and the bonding surface is the side that bonds to the patient's real teeth; the bonding surface is provided with textures, and the textures are concave textures and / or convex textures; the transmittance of the appearance layer is higher than the transmittance of the wing plate substrate.

2. The Maryland bridge wing plate according to claim 1, characterized in that: The thickness of the Maryland bridge wing plate ranges from 0.3 to 1 cm.

3. The Maryland bridge wing plate according to claim 1, characterized in that: The thickness of the wing plate substrate ranges from 0.2 to 0.9 cm, and the thickness of the appearance layer ranges from 0.1 to 0.8 cm.

4. The Maryland bridge wing plate according to claim 1, characterized in that: The material of the wing plate substrate is zirconium oxide; the material of the appearance layer is high-transmittance zirconium oxide, and the high-transmittance zirconium oxide is a mixture of yttrium oxide and zirconium oxide.

5. The Maryland bridge wing plate according to claim 1, characterized in that: The lines are continuous line lines, the protrusion or depression depth of the lines is 10 μm to 30 μm, the width of the lines is 50 μm to 100 μm, and the spacing between two adjacent lines is 100 μm to 200 μm.

6. The Maryland bridge wing plate according to claim 1, characterized in that: The texture is a discontinuous pattern texture, and the pattern used by the discontinuous pattern texture includes at least one of a star, a dot, a hexagon, a triangle, a square, and a slash. The protrusion or depression depth of the pattern is 10μm to 30μm, the width of the pattern is 50μm to 100μm, and the spacing between two adjacent patterns is 100μm to 200μm.

7. The Maryland bridge wing plate according to claim 4, characterized in that: The zirconium oxide material of the wing plate substrate is doped with a preset colorant, and the colorant includes one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate; and the appearance layer is coated with a glaze layer.

8. A method for manufacturing a Maryland bridge wing plate according to any one of claims 1 to 7, characterized in that: The production method comprises: Obtaining the initial three-dimensional structure of the Maryland bridge wing for the patient's denture installation; The initial three-dimensional structure is configured, and a wing plate substrate and an appearance layer are divided from the initial three-dimensional structure, wherein the wing plate substrate includes an inner bonding surface and an outer side surface, the outer side surface is wrapped with the appearance layer, and the bonding surface is provided with a texture, and the texture is a concave texture and / or a convex texture, so as to obtain the configured three-dimensional structure of the Maryland bridge wing plate; Setting a protective layer of a preset thickness on the outer contour of the three-dimensional structure of the Maryland bridge wing plate to obtain printing three-dimensional structure data; Prepare a first ink for printing the wing plate substrate, prepare a second ink for printing the appearance layer, and prepare a supporting material ink for printing the protective layer; The first ink, the second ink and the supporting material ink are loaded into a 3D printer, and 3D printing is performed according to the printed three-dimensional structure data to obtain a green embryo; The green body is cleaned to remove the protective layer, and then degreased and sintered to obtain the Maryland bridge wing plate.

9. The method for manufacturing the Maryland bridge wing plate according to claim 8, characterized in that: The first ink comprises 30-60 wt % of tetragonal zirconium oxide, 30-60 wt % of ethylene glycol and 10-20 wt % of a first dispersant; The second ink comprises 30-60 wt% of high-permeability zirconium oxide, 30-60 wt% of ethylene glycol and 10-20 wt% of a second dispersant, wherein the high-permeability zirconium oxide is a mixture of yttrium oxide and zirconium oxide; The supporting material ink comprises 30-50 wt % of sodium carbonate, 40-60 wt % of ethylene glycol and 10-20 wt % of a third dispersant.

10. The method for manufacturing the Maryland bridge wing plate according to claim 8, characterized in that: The 3D printer includes three primary ink barrels and three secondary ink barrels. The step of loading the first ink, the second ink and the support material ink into the 3D printer and performing 3D printing according to the printed three-dimensional structure data to obtain a green embryo includes: The first ink, the second ink and the support material ink are respectively loaded into three primary ink barrels of the 3D printer, and each of the first ink barrels is in a continuous stirring state; Controlling to gradually introduce the first ink, the second ink and the supporting material ink from the three primary ink barrels into the three secondary ink barrels respectively; In a secondary ink barrel corresponding to the first ink, a dye is added to the first ink to dye it, so as to obtain a first dye ink, wherein the type and content of the dye are determined according to a preset dye color number of the Maryland bridge wing plate, wherein the dye comprises one or more of erbium nitrate, neodymium nitrate, praseodymium nitrate, and iron nitrate, and the concentration range of each dye in the first ink is 0.1 to 0.8 mol / L; According to the printed three-dimensional structure data, the print head of the 3D printer is controlled to print layer by layer, and the first dye ink, the second ink and the support material ink are correspondingly sprayed according to the structural distribution of each layer. After completing 3D printing, the green embryo is obtained.

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