Bionic planting bridge

Abstract

The invention discloses a bionic planting bridge, and belongs to the field of planting bridges. The bionic planting bridge frame comprises an implant and a connector, the number of the implants is multiple, and each implant is matched with the shape of a conventional tooth of a human body; the plurality of implants are arranged according to a conventional tooth sequence of a human body, and every two adjacent implants are connected through a connecting body; each implant is changed from a solid structure to a first porous structure in a direction from a tooth tip to a tooth root, so that the elastic modulus is reduced; the elastic modulus of each implant is reduced by increasing the porosity in the direction from the center to the edge of the tooth; the elastic modulus of dentin, which is an implant for incisor teeth, canine teeth, and molar teeth, is sequentially increased by reducing the porosity. While the bionic implant bridge is made of the same material, different elastic moduli are achieved according to different positions of human physiological teeth, the elastic moduli are consistent with the actual elastic deformation condition of the human physiological teeth, and the bionic implant bridge has bionic design.

Description

Technical Field

[0001] This application relates to the technical field of implant bridges, and particularly to a bionic implant bridge. Background Art

[0002] With the continuous improvement of people's living standards and the gradual extension of the average human lifespan, the average age of edentulous patients is increasing, and at the same time, there will be a gradual absorption and atrophy of the alveolar ridge. It is more difficult for edentulous patients to repair teeth with conventional single dentures. Such patients generally need to customize implant bridges for semi - complete or complete denture restoration.

[0003] However, in reality, human physiological teeth include enamel, dentin, and cementum, and the elastic deformation of each part is different. The existing implant bridges for complete denture restoration are made of the same material, so the overall elastic deformation ability of the implant bridge is the same, which is quite different from the actual elastic deformation of human physiological teeth and lacks bionic design. Summary of the Invention

[0004] The embodiments of this application provide a bionic implant bridge, which can solve the problem that the overall elastic deformation ability of the existing implant bridge is the same and there is a large difference from the actual elastic deformation of teeth.

[0005] To achieve the above purpose, the technical solution of the embodiments of the present invention is as follows:

[0006] The embodiments of the present invention provide a bionic implant bridge, including implants and connectors; there are multiple implants, and each implant is adapted to the shape of a human conventional tooth; the multiple implants are arranged in the order of human conventional teeth, and adjacent implants are connected by connectors; from the cusp to the root of each implant, the elastic modulus decreases as the solid structure changes to the first porous structure; from the center to the edge of each implant, the elastic modulus decreases by increasing the porosity; by reducing the porosity, the elastic modulus of the dentin of the implants serving as incisors, canines, and molars increases in sequence.

[0007] In a possible implementation, the first formula for the elastic modulus reduction of each implant from the cusp to the root is:

[0008]

[0009] In the formula, y is the elastic modulus of the implant, and x is the height of a certain position of the implant from the cusp.

[0010] In a possible implementation, the second formula for the elastic modulus reduction of each implant from the center to the edge of the tooth is:

[0011]

[0012] In the formula, y is the elastic modulus, and x is the distance from a certain position of the implant to the center of the tooth.

[0013] In a possible implementation, the elastic modulus of the dentin of the implant as a molar is 19.2 GPa, the elastic modulus of the dentin of the implant as a canine is 18.24 GPa, and the elastic modulus of the dentin of the implant as an incisor is 17.28 GPa.

[0014] In a possible implementation, the bionic implant bridge is formed by 3D printing of carbon fiber reinforced PEEK filaments.

[0015] In a possible implementation, the shape of the connector is the shape of a conventional human connection area and is a second porous structure.

[0016] In a possible implementation, the connector includes a cross-bridge and a vertical bridge; there are two cross-bridges, and the two cross-bridges are arranged in parallel between the two implants, and one cross-bridge is connected to the upper parts of the two implants, and the other cross-bridge is connected to the lower parts of the two implants; there is one vertical bridge, and both ends of the one vertical bridge are respectively connected to the two cross-bridges.

[0017] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0018] The bionic implant bridge provided in the embodiments of the present application has multiple implants arranged in the order of conventional human teeth, and adjacent two implants are connected by a connector. By changing the solid structure of each implant from the cusp to the root direction to a first porous structure so that the elastic modulus decreases from the cusp to the root direction, and by increasing the porosity in the direction from the center of the tooth to the edge of each implant to reduce the elastic modulus, and by reducing the porosity to increase the elastic modulus of the dentin of the implants as incisors, canines and molars in sequence, so that the overall elastic deformation ability of the bionic implant bridge is consistent with the situation of human physiological teeth. While using the same material to make the bionic implant bridge, it is possible to have different elastic moduli according to different positions of human physiological teeth, which is adapted to the structure of human physiological teeth, so that the overall bionic implant bridge is consistent with the actual elastic deformation of human physiological teeth and has a bionic design. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Structural schematic of the bionic implant bridge provided by the embodiment of the present application Figure One ;

[0021] Figure 2 Structural schematic of the bionic implant bridge provided by the embodiment of the present application Figure Two ;

[0022] Figure 3 Schematic diagram of the second porous structure of the connector provided by the embodiment of the present application;

[0023] Figure 4 Fitting diagram of the first formula provided by the embodiment of the present application;

[0024] Figure 5 Fitting diagram of the second formula provided by the embodiment of the present application.

[0025] Icon: 1 - implant; 2 - connector; 3 - incisor; 4 - canine; 5 - molar; 6 - solid structure; 7 - first porous structure. Specific implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] Human physiological teeth include enamel, dentin, and cementum, and the elastic deformation of each part is different. The existing implant bridges for complete denture restoration are made of the same material (such as all made of a single material like metal or PEEK, etc.), so that the overall elastic deformation ability of the implant bridge is the same, which is quite different from the actual elastic deformation of human physiological teeth and has no bionic design. For example, taking titanium alloy (Ti6Al4V) as an example, its elastic modulus is 110 GPa, which is greater than that of tooth bone (the elastic modulus of enamel is 83 GPa, the elastic modulus of dentin is 19.2 GPa, and the elastic modulus of cementum is 2.4 GPa), and there is no gradient distribution of elastic modulus. Therefore, using a single material like titanium alloy (Ti6Al4V) to make the implant bridge is quite different from the actual elastic deformation of human physiological teeth.

[0029] Please refer to Figure 1 and Figure 2 As shown in the figure, the embodiment of the present invention provides a bionic implant bridge, which includes an implant 1 and a connector 2.

[0030] There are multiple implants 1, and each implant 1 is adapted to the shape of a human conventional tooth. When the bionic implant bridge of the embodiment of the present application is used for complete denture restoration, the number of multiple implants 1 is the total number of upper jaw teeth or the total number of lower jaw teeth. For example, Figure 1 shows a schematic structural diagram with a total of fourteen implants 1. The multiple implants 1 are arranged in the order of human conventional teeth, and adjacent two implants 1 are connected by a connector 2.

[0031] Such as Figure 1 and Figure 2As shown, the direction of each implant 1 from the cusp to the root changes from the solid structure 6 to the first porous structure 7 to reduce the elastic modulus. As Figure 2 shown, for each implant 1, the direction from the cusp to the root can change from the solid structure 6 to the first porous structure 7 in height regions to reduce the elastic modulus in height regions. Or for each implant 1, the direction from the cusp to the root can gradually change from solid to the first porous structure 7 to gradually reduce the elastic modulus.

[0032] In practice, isotropic porous structures can all reduce the elastic modulus of the implant 1. In the embodiments of the present application, the porosity of the first porous structure 7 is equal to the reduced elastic modulus value. For example: designed on the basis of the isotropic unit cell of the pore structure, the elastic modulus is reduced to 30% of the solid structure 6 (that is, the reduced elastic modulus value is 70%), then the porosity can be set to 70%, that is, the solid structure 6 accounts for 30% of the volume of the entire implant 1.

[0033] In addition, the first porous structure 7 can be designed as an isotropic structure, such as a regular hexahedron and a regular octahedron, etc., or can be designed as a random grid structure.

[0034] As Figure 1 shown, for each implant 1, the elastic modulus is reduced by increasing the porosity in the direction from the tooth center to the edge. For each implant 1, the elastic modulus can be reduced in radius regions by increasing the porosity in radius regions in the direction from the tooth center to the edge. Or for each implant 1, the elastic modulus can be gradually reduced by gradually increasing the porosity in the direction from the tooth center to the edge. If the tooth center is a solid structure, that is, it changes from a solid structure to a porous structure. If the tooth center is a porous structure, then it changes from a porous structure with a small porosity to a porous structure with a large porosity.

[0035] Continue to refer to Figure 1 shown, by reducing the porosity, the elastic modulus of the dentin of the implants 1 serving as incisors 3, canines 4 and molars 5 increases in sequence, so that the implants 1 at different positions have different elastic moduli.

[0036] In practice, after the bionic implant bridge is implanted in the oral cavity, it will adhere to the dental crown, or medical silicone will be filled on at least the surface of the porous structure. This medical silicone is non-toxic and does not affect the performance and elastic modulus of the porous structure, so as to be able to seal the surface of the porous structure and prevent foreign objects from entering the porous structure.

[0037] The bionic implant bridge provided by the embodiment of the present application has multiple implants 1 arranged in the order of normal human teeth, and adjacent implants 1 are connected by a connector 2. By changing the solid structure 6 to the first porous structure 7 in the direction from the cusp to the root of each implant 1, the elastic modulus is reduced in the direction from the cusp to the root, and the elastic modulus is reduced by increasing the porosity in the direction from the center to the edge of the tooth. By reducing the porosity, the elastic modulus of the dentin of the implants 1 serving as incisors 3, canines 4, and molars 5 is increased in sequence, so that the overall elastic deformation ability of the bionic implant bridge is consistent with the situation of human physiological teeth. While using the same material to make the bionic implant bridge, different elastic moduli are achieved according to different positions of human physiological teeth, which is adapted to the structure of human physiological teeth, so that the overall bionic implant bridge is consistent with the actual elastic deformation of human physiological teeth and has a bionic design.

[0038] Optionally, the first formula for the reduction of the elastic modulus of each implant 1 in the direction from the cusp to the root is:

[0039]

[0040] In the formula, y is the elastic modulus of the implant 1, and x is the height of a certain position of the implant 1 from the cusp.

[0041] Specifically, the elastic moduli of different regions of a single human physiological tooth are different. The elastic modulus of enamel is 83 GPa, the elastic modulus of dentin is 19.2 GPa, and the elastic modulus of cementum is 2.4 GPa. From the cusp to the root, the elastic modulus decreases in sequence. Therefore, the bionic implant bridge of the embodiment of the present application is designed with reference to the above characteristics. Since a ceramic crown (enamel) needs to be pasted on the outer surface of the bionic implant bridge, the elastic modulus of the cusp (dentin) of the bionic implant bridge is set to 19.2 GPa, which is the same as the elastic modulus of the carbon fiber-reinforced PEEK solid. Therefore, the cusp of the bionic implant bridge is set as the solid structure 6. The outer surface of the physiological tooth neck is cementum, and the elastic modulus is 2.4 GPa. Therefore, the elastic modulus of the root (dentin) of the bionic implant bridge is reduced to 2.4 GPa.

[0042] The height of the tooth is between 18 mm and 22 mm, the effective height of the tooth crown is between 3 mm and 5 mm, the effective height of the dentin is between 5 mm and 7 mm, and the remaining height is cementum. Finally, the total height of the tooth can be set to 20 mm, the height of the tooth crown is 4 mm, the height of the dentin is 6 mm, and the height of the cementum is 10 mm. Since the bionic implant bridge is mainly composed of the structures of dentin and cementum, according to three point parameters A(4, 19.2), B(10, 12.5), and C(20, 2.4), the first formula for the gradual reduction of the elastic modulus of the implant 1 in the direction from the cusp to the root is fitted according to the three groups of data. The curve graph is as Figure 4As shown. This first formula is applicable to each implant 1 and can truly fit the change in the elastic modulus of the human physiological tooth.

[0043] Furthermore, the second formula for the decrease in the elastic modulus of each implant 1 in the direction from the tooth center to the edge is:

[0044]

[0045] In the formula, y is the elastic modulus, and x is the distance of a certain position of the implant 1 from the tooth center.

[0046] Specifically, the elastic modulus of the inner and outer edges of a single human physiological tooth (taking the molar 5 as an example) is lower than that of the central region and is 80% of the central region. Therefore, the bionic implant bridge of the embodiment of the present application conforms to the above characteristics.

[0047] Assume the change in the elastic modulus at the center position and the edge position of a tooth plane. The distance of this plane from the cusp is 10 mm, the central elastic modulus is 12.5 GPa, then the edge elastic modulus is 12.5 * 0.8 = 10 GPa. The width of the molar 5 is 4.5 mm, so the gradient distance of the elastic modulus is 2.25 mm. Thus, two points D(0, 12.5) and E(2.25, 10) are obtained. According to the two sets of data, the second equation can be fitted, as Figure 5 shown. This second formula is applicable to each implant 1 and can truly fit the change in the elastic modulus of the human physiological tooth.

[0048] Optionally, the elastic modulus of the dentin of the implant 1 for the molar 5 is 19.2 GPa, the elastic modulus of the dentin of the implant 1 for the canine 4 is 18.24 GPa (which is 0.95 times the elastic modulus of the dentin of the molar 5, that is, 19.2 * 0.95 = 18.24 GPa), and the elastic modulus of the dentin of the implant 1 for the incisor 3 is 17.28 GPa (which is 0.9 times the elastic modulus of the dentin of the molar 5, that is, 19.2 * 0.9 = 17.28 GPa), so as to truly fit the change in the elastic modulus of the human physiological tooth.

[0049] In practice, bionic implant bridges are made of carbon fiber reinforced PEEK wires through 3D printing. The elastic modulus of carbon fiber reinforced PEEK wires is usually between 10GPa and 20GPa. Its high elastic modulus makes it deform less when subjected to force, and it can maintain good dimensional stability and structural integrity. It is particularly suitable for medical prostheses that require high precision and stability. Compared with metal materials (elastic modulus of titanium alloy materials is 110GPa, elastic modulus of cobalt-chromium-molybdenum alloy materials is 230GPa, and medical stainless steel is 190-205GPa), the elastic modulus of carbon fiber reinforced PEEK wires is closer to human teeth, and the elastic modulus of carbon fiber reinforced PEEK wires used to prepare bionic implant bridges is more compatible with the actual elastic deformation of human physiological teeth.

[0050] In practice, when the core of the implant 1 of the bionic implant bridge is stressed, the tooth connection area will produce micro-movement. Figure 3 As shown, the connector 2 is in the shape of a conventional connection area of ​​the human body and is a second porous structure, thereby reducing the elastic modulus of the connector 2, so that the connector 2 can provide a buffer between two adjacent implants 1. When the bionic implant bridge is actually used, medical silica gel will be filled at least on the surface of the second porous structure. The medical silica gel is non-toxic and does not affect the performance and elastic modulus of the second porous structure. At the same time, it can block the surface of the second porous structure to prevent foreign matter from entering the second porous structure.

[0051] Alternatively, the connector 2 includes a transverse bridge and a vertical bridge. The transverse bridge includes two, and the two transverse bridges are arranged in parallel between the two implants 1, and one transverse bridge is connected to the upper part of the two implants 1, and the other transverse bridge is connected to the lower part of the two implants 1. The vertical bridge includes one, and the two ends of the vertical bridge are respectively connected to the two transverse bridges. Preferably, the vertical bridge is perpendicular to the transverse bridge, that is, the connector 2 is in the shape of an "I", so that the strength of the connector 2 is not reduced while reducing the material and weight, and a buffer can be provided between two adjacent implants 1.

[0052] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0053] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A bionic planting bridge, characterized in that: Including implants and connectors; The implant comprises a plurality of implants, each of which is adapted to the shape of a conventional human tooth; The plurality of implants are arranged in the order of conventional human teeth, and two adjacent implants are connected by a connector; Each of the implants changes from a solid structure to a first porous structure in a direction from the tooth tip to the tooth root so as to reduce the elastic modulus; Each of the implants has a lower elastic modulus by increasing porosity from the center to the edge of the tooth; The elastic modulus of the dentin of the implant as incisor, canine and molar is increased in sequence by decreasing the porosity.

2. The bionic planting bridge according to claim 1, characterized in that: The first formula for the decrease in elastic modulus of each implant from the apex to the root is: In the formula, y is the elastic modulus of the implant, and x is the height of a certain position of the implant from the apex of the tooth.

3. The bionic planting bridge according to claim 1 or 2, characterized in that: The second formula for the decrease in elastic modulus of each implant from the center to the edge of the tooth is: Wherein, y is the elastic modulus, and x is the distance between a certain position of the implant and the center of the tooth.

4. The bionic planting bridge according to claim 1 or 2, characterized in that: The elastic modulus of the dentin of the implant as a molar was 19.2 GPa, the elastic modulus of the dentin of the implant as a canine was 18.24 GPa, and the elastic modulus of the dentin of the implant as an incisor was 17.28 GPa.

5. The bionic planting bridge according to claim 1, characterized in that: The bionic implant bridge is made of carbon fiber reinforced PEEK wire through 3D printing.

6. The bionic planting bridge according to claim 1, characterized in that: The connector has a shape similar to that of a conventional connecting region of a human body and is a second porous structure.

7. The bionic planting bridge according to claim 1, characterized in that: The connector includes a horizontal bridge and a vertical bridge; The cross bridges include two cross bridges, which are arranged in parallel between the two implants, and one cross bridge is connected to the upper parts of the two implants, and the other cross bridge is connected to the lower parts of the two implants; The vertical bridge comprises one, and two ends of the vertical bridge are respectively connected to the two horizontal bridges.

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