Personalized implant preparation method and 3D printing personalized implant

Abstract

The invention discloses a personalized implant preparation method and a 3D printing personalized implant, and relates to the technical field of dental implants.The personalized implant preparation method comprises the following steps that S1, a corresponding three-dimensional entity model is obtained according to three-dimensional shape data of an oral cavity environment; s2, obtaining the volume fraction of the inner porous core part according to a set design numerical value of the oral implant and a corresponding formula; s3, the thickness and the material of the outer wrapping layer are given, and the actual volume of the inner porous core part is obtained through a volume fraction formula; s4, giving unit cell types, number and the like to obtain the actual volume of a single unit cell; calculating and determining size data of a single unit cell according to the condition that the volume fraction of the single unit cell is the same as that of the inner porous core; and S5, printing is conducted through the 3D printing technology. The 3D printing personalized implant comprises an outer wrapping layer and an inner porous core part, and the inner porous core part consists of unit cells which are periodically and repeatedly arranged. The implant with the required performance can be manufactured according to the design requirement, and the use risk of the implant is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dental implant technology, and particularly to a method for preparing a personalized implant and a 3D printed personalized implant. Background Art

[0002] An implant, commonly known as an artificial tooth root, can replace the root of a natural tooth and needs to be implanted into the alveolar bone. It is to implant a material with good tissue compatibility into the jawbone of the human body through a surgical operation to replace the natural tooth to perform the chewing function.

[0003] Since titanium and traditional titanium alloy materials are relatively ideal biomaterials, having good mechanical properties, biocompatibility and corrosion resistance, they are widely used in oral medicine. Usually, an implant is a solid structure made by machining. However, pure titanium and traditional titanium alloy materials also have some problems. When pure titanium is applied to an implant, its strength and stiffness are not high, and the material hardness is insufficient, resulting in poor wear resistance. Under long-term and repeated stress, wear will occur, generating metal particles and debris. These metal particles and debris can cause local tissue lesions and inflammation. For traditional titanium alloy materials, it mainly refers to Ti-6Al-4V alloy and Ti-6Al-7Nb alloy. And the elastic modulus of these two titanium alloys (about 120 GPa) is still very high compared with that of bone (10 - 35 GPa). Titanium alloys with a low elastic modulus have better load transfer characteristics than those with a high elastic modulus. Since the dense metal implant will bear most of the load, the stress level of the bone tissue near the implant will be significantly reduced, causing a decrease in the density and strength of the bone tissue around the implant, generating a stress shielding effect, which may lead to slow bone tissue healing, followed by problems such as bone resorption, implant loosening, and failure.

[0004] Based on this, it is necessary to provide a preparation method for a personalized implant that can produce an implant with the required performance according to the preliminary design. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preparing a personalized implant and a 3D printed personalized implant to solve the problems existing in the above-mentioned prior art, and be able to produce an implant with the required performance according to the design requirements, reducing the use risk of the implant.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] The present invention provides a method for preparing a personalized implant, including the following steps:

[0008] S1. Obtain the three-dimensional shape data of the oral cavity environment, and obtain a three-dimensional solid model of a personalized oral implant. Divide the three-dimensional solid model into an outer wrapping layer and an inner porous core located inside the outer wrapping layer. The inner porous core is composed of a periodic lattice structure, and the periodic lattice structure is composed of multiple periodically arranged unit cells.

[0009] S2. Set the design value of any one of the effective modulus, yield strength, or ultimate strength of the oral implant, and obtain the volume fraction of the inner porous core according to the corresponding formula.

[0010]

[0011] Where:

[0012] ①σ y σ max E eff are respectively the yield strength, ultimate strength, and effective modulus of the inner porous core.

[0013] ②σ y0 σ max0 and E 0 are the yield strength, ultimate strength, and elastic modulus of the bulk material.

[0014] ③ is the volume fraction of the inner porous core.

[0015] S3. By specifying the thickness and material of the outer wrapping layer, and according to the following volume fraction formula of the inner porous core, calculate and obtain the actual volume of the inner porous core (i.e., the total volume of each unit cell in the periodic lattice structure).

[0016]

[0017] Where: V st is the actual volume of the inner porous core; V is the total volume of the outer wrapping layer.

[0018] S4. By specifying the unit cell type and quantity, and combining with the actual volume of the inner porous core obtained in S3, obtain the actual volume of a single unit cell. Based on the same volume fraction of a single unit cell as that of the inner porous core, calculate and determine the size data of a single unit cell.

[0019] S5. After the above steps, determine the specific structures of each part constituting the three-dimensional solid model of the oral implant, obtain the three-dimensional model of the 3D printed implant, and print the structural model through 3D printing technology.

[0020] Preferably, in S1, the three-dimensional shape data of the oral cavity environment includes oral scan data and oral CT data; the oral scan data is obtained by using a dental scanner to perform laser three-dimensional scanning; the oral CT data is obtained by CT detection.

[0021] Preferably, in S5, it is confirmed whether the obtained 3D printed implant three-dimensional model closely adheres to the tooth-deficient part of the 3D alveolar bone model. After it can closely adhere to the tooth-deficient part of the 3D alveolar bone model, it is printed by 3D printing technology to obtain a semi-finished personalized implant.

[0022] Preferably, the printed semi-finished personalized implant is matched with the 3D alveolar bone model again. After confirming that the degree of close adhesion meets the standard, a finished personalized implant is formed and stored aseptically in a designated disinfection cabinet.

[0023] Preferably, after the finished personalized implant is sandblasted, polished and ultrasonically cleaned, it is stored aseptically in a designated disinfection cabinet.

[0024] The present invention also provides a 3D printed personalized implant prepared by the personalized implant preparation method described in any one of the above, including an outer wrapping layer and an inner porous core part located inside the outer wrapping layer; the inner porous core part is composed of a periodic lattice structure, and the periodic lattice structure is composed of a plurality of periodically arranged unit cells.

[0025] Preferably, a abutment is fixedly arranged on the outer wrapping layer.

[0026] Preferably, the abutment and the outer wrapping layer are integrally formed.

[0027] Preferably, the materials of the outer wrapping layer and the inner porous core part are both Ti-6Al-4V alloy materials.

[0028] Preferably, the unit cell is a tetrahedral porous structure.

[0029] The present invention has achieved the following technical effects compared with the prior art:

[0030] The personalized implant preparation method provided by the present invention creates a personalized implant model by obtaining accurate three-dimensional shape data of the oral environment, enabling the implant to perfectly fit with tissues such as the alveolar bone and gingiva in the patient's oral cavity. After setting the design values of the key performance indicators (effective modulus, yield strength or ultimate strength) of the implant, the volume fraction of the inner porous core is deduced backwards using the corresponding formula. After giving the parameters of the outer wrapping layer, the actual volume of the inner porous core is calculated according to the volume fraction formula of the inner porous core. Further, in combination with the type and quantity of unit cells, the volume and size of a single unit cell are calculated. This process gradually concretizes the abstract performance requirements to the microscopic structure level, making each component of the implant accurately quantified. The determination of the accurate unit cell size can strictly control the internal structure performance of the implant to ensure that an implant with the required performance can be manufactured according to the design requirements, thereby reducing various usage risks caused by non-conforming implant performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic cross-sectional structure diagram of a 3D printed personalized implant provided by the present invention;

[0033] Figure 2 It is a schematic structure diagram of a 3D printed personalized implant provided by the present invention;

[0034] Figure 3 It is a schematic structure diagram of a 3D printed personalized implant with a abutment provided by the present invention;

[0035] Figure 4 It is the external shape of the corresponding tooth to be extracted obtained from the three-dimensional shape data of the oral environment.

[0036] In the figure: 1 - outer wrapping layer; 2 - inner porous core; 3 - abutment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0038] The object of the present invention is to provide a method for preparing a personalized implant system and a 3D-printed personalized implant, so as to solve the problems existing in the prior art, be able to fabricate an implant with required performance according to design requirements, and reduce the use risk of the implant.

[0039] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1

[0041] This embodiment provides a method for preparing a personalized implant, as Figures 1 to 4 shown, including the following steps:

[0042] S1. Obtain the three-dimensional shape data of the oral cavity environment, and obtain a three-dimensional solid model of a personalized oral implant. The three-dimensional solid model is divided into an outer wrapping layer 1 and an inner porous core 2 located inside the outer wrapping layer 1; the inner porous core 2 is composed of a periodic lattice structure, and the periodic lattice structure is composed of a plurality of periodically arranged unit cells;

[0043] S2. Set the design value of any one of the effective modulus, yield strength or ultimate strength of the oral implant, and obtain the volume fraction of the inner porous core 2 according to the corresponding formula (which is an empirical formula);

[0044]

[0045] Wherein:

[0046] ①σ y ,σ max ,E eff are respectively the yield strength, ultimate strength and effective modulus of the inner porous core 2;

[0047] ②σ y0 ,σ max0 and E 0 are the yield strength, ultimate strength and elastic modulus of the bulk material;

[0048] ③ is the volume fraction of the inner porous core 2;

[0049] S3. By specifying the thickness and material of the outer wrapping layer 1, and according to the following volume fraction formula of the inner porous core 2, calculate and obtain the actual volume of the inner porous core 2 (i.e., the total volume of each unit cell in the periodic lattice structure);

[0050]

[0051] Wherein: V st is the actual volume of the inner porous core 2; V is the total volume of the outer wrapping layer 1;

[0052] S4. By specifying the type and quantity of unit cells and combining with the actual volume of the inner porous core 2 obtained in S3, the actual volume of a single unit cell is obtained. Based on the same volume fraction of a single unit cell and the inner porous core 2, the size data of a single unit cell is calculated and determined.

[0053] S5. After the above steps, the specific structures of the various parts constituting the three-dimensional solid model of the oral implant are determined, a 3D printed implant three-dimensional model is obtained, and the structural model is printed by 3D printing technology.

[0054] By obtaining the accurate three-dimensional shape data of the oral cavity environment to create a personalized implant model, the implant can be perfectly fitted to the alveolar bone, gums and other tissues of the patient's oral cavity. After setting the design values of the key performance indicators (effective modulus, yield strength or ultimate strength) of the implant, the volume fraction of the inner porous core 2 is deduced using the corresponding formula. After specifying the parameters of the outer wrapping layer 1, its actual volume is calculated according to the volume fraction formula of the inner porous core 2. Further combining the unit cell type and quantity, the volume and size of a single unit cell are calculated. This process gradually concretizes the abstract performance requirements to the microscopic structure level, so that each component of the implant is accurately quantified. The accurate determination of the unit cell size can strictly control the internal structure performance of the implant to ensure that an implant with the required performance can be manufactured according to the design requirements, thereby reducing various usage risks caused by non-conforming implant performance.

[0055] Among them, regarding the relevant description in S1:

[0056] In an alternative embodiment of the present example, preferably, in S1, the three-dimensional shape data of the oral cavity environment includes oral scan data and oral CT data; the oral scan data is obtained by using a dental scanner to perform laser three-dimensional scanning; the oral CT data is obtained by CT detection.

[0057] Among them, regarding the relevant description in S5:

[0058] In an alternative embodiment of the present example, preferably, in S5, it is confirmed whether the obtained 3D printed implant three-dimensional model is closely attached to the toothless area of the 3D alveolar bone model. After it can be closely attached to the toothless area of the 3D alveolar bone model, it is printed by 3D printing technology to obtain a semi-finished personalized implant.

[0059] In an alternative embodiment of the present example, preferably, the printed semi-finished personalized implant is combined with the 3D alveolar bone model again. After confirming that the degree of close attachment meets the standard, a finished personalized implant is formed and stored aseptically in a designated disinfection cabinet.

[0060] In an alternative solution of this embodiment, preferably, after the personalized implant finished product is sandblasted, polished and ultrasonically cleaned, it is aseptically stored in a designated disinfection cabinet.

[0061] Embodiment 2

[0062] This embodiment provides a 3D printed personalized implant prepared by the personalized implant preparation method based on Embodiment 1. As Figures 1 to 4 shown, it includes an outer wrapping layer 1 and an inner porous core 2 located inside the outer wrapping layer 1; the inner porous core 2 is composed of a periodic lattice structure, and the periodic lattice structure is composed of a plurality of periodically arranged unit cells.

[0063] Specifically, the unit cell of the periodic lattice structure can be a tetrahedral porous structure, a cubic porous structure, a diagonal porous structure, etc.

[0064] Among them, the relevant settings of the outer wrapping layer 1 are described as follows:

[0065] In an alternative solution of this embodiment, preferably, as Figure 3 shown, a abutment 3 is fixedly arranged on the outer wrapping layer 1.

[0066] In an alternative solution of this embodiment, preferably, the abutment 3 and the outer wrapping layer 1 are integrally formed.

[0067] Among them, the relevant settings of the inner porous core 2 are described as follows:

[0068] In an alternative solution of this embodiment, preferably, the unit cell is a tetrahedral porous structure.

[0069] Among them, other relevant descriptions are as follows:

[0070] In an alternative solution of this embodiment, preferably, the materials of both the outer wrapping layer 1 and the inner porous core 2 are Ti-6Al-4V alloy materials.

[0071] Specifically, a case illustration:

[0072] 1. Extract CT images for reconstruction to obtain a tooth external model as Figure 4 shown: Reconstruct the CT data through commercial software such as Mimics to construct the external shape of the tooth to be extracted;

[0073] 2. Design the shape of the tooth implant with root characteristics according to the external shape of the tooth: Design an implant with a bionic structure according to the external shape of the tooth. As Figure 2 shown, the lower half of the implant is basically the same as the tooth shape;

[0074] 3. At Figure 2Construct the abutment 3 structure on the basis of [description missing in the original], and the abutment 3 structure is an integrated structure with the bionic implant, which is convenient for later cooperation with the dental crown;

[0075] 4. Set the elastic model of the tooth, and select the tetrahedral porous structure and Ti-6Al-4V alloy material. The elastic modulus of its body material is 110 Gpa, and the elastic modulus of the designed structure is 13.7 Gpa. The volume fraction is obtained to be approximately 35.28% through the corresponding formula. The thickness of region 1 of the tooth model is designed to be 1 mm by CAD software, and the total volume of the implant is 200.33 mm 3 , and the volume of the solid part of the outer wrapping layer 1 is 91.22 mm 3 , and the total volume of the inner porous core 2 is 109.11 mm 3 . Therefore, the actual volume of the inner porous core 2 should be 38.41 mm 3 (35.28% × 109.11 mm 3 ). Therefore, by controlling the size and unit cell type (rod length, diameter, etc.) of its porous structure, the volume fraction is made consistent with the set volume fraction;

[0076] 5. Design the porous structure for the inner porous core 2, and its volume fraction conforms to the setting of the previous step. Therefore, through this process, the structural design of the implant with the elastic modulus required by the design can be achieved;

[0077] 6. Finally, print the structural model by 3D printing technology, and perform operations such as sandblasting and polishing, and ultrasonic cleaning.

[0078] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for preparing a personalized implant, characterized in that: The following steps are involved: S1, obtaining three-dimensional shape data of the oral environment, and obtaining a three-dimensional solid model of a personalized oral implant, and dividing the three-dimensional solid model into an outer wrapping layer and an inner porous core located inside the outer wrapping layer; the inner porous core is composed of a periodic lattice structure, and the periodic lattice structure is composed of a plurality of periodically repeatedly arranged unit cells; S2, setting a design value of any one of the effective modulus, yield strength or ultimate strength of the oral implant, and obtaining the volume fraction of the inner porous core according to the corresponding formula; in: ①σ y , σ max , E eff They are the yield strength, ultimate strength and effective modulus of the inner porous core; ②σ y0 , σ max0 and E0 are the yield strength, ultimate strength and elastic modulus of the bulk material; ③ is the volume fraction of the inner porous core; S3, by giving the thickness and material of the outer covering layer and according to the following volume fraction formula of the inner porous core, the actual volume of the inner porous core (i.e., the total volume of each unit cell in the periodic lattice structure) is calculated; Where: V st is the actual volume of the inner porous core; V is the total volume of the outer covering layer; S4, by giving the unit cell type and number, combined with the actual volume of the inner porous core obtained in S3, the actual volume of a single unit cell is obtained; based on the volume fraction of the single unit cell being the same as the volume fraction of the inner porous core, the size data of the single unit cell is calculated and determined; S5, after the above steps, the specific structure of each part constituting the three-dimensional solid model of the oral implant is determined, a 3D printed three-dimensional model of the implant is obtained, and the structural model is printed by 3D printing technology.

2. The method for preparing a personalized implant according to claim 1, characterized in that: In S1, the three-dimensional shape data of the oral environment includes oral scan data and oral CT data; Acquire oral scan data using a dental scanner using laser 3D scanning; Oral CT data is obtained through CT detection.

3. The method for preparing a personalized implant according to claim 1, characterized in that: In S5, the obtained 3D printed implant three-dimensional model is confirmed to see whether it fits tightly with the missing teeth of the 3D alveolar bone model. After it can fit tightly with the missing teeth of the 3D alveolar bone model, it is printed by 3D printing technology to obtain a personalized implant semi-finished product.

4. The method for preparing a personalized implant according to claim 3, characterized in that: The printed personalized implant semi-finished product is matched with the 3D alveolar bone model again, and after confirming that the degree of fit and attachment meets the standard, a personalized implant product is formed and placed in a designated disinfection cabinet for sterile storage.

5. The method for preparing a personalized implant according to claim 4, characterized in that: The finished personalized implants are sandblasted, polished, and ultrasonically cleaned before being placed in a designated sterilization cabinet for sterile storage.

6. A 3D printed personalized implant prepared by the personalized implant preparation method according to any one of claims 1 to 5, characterized in that: comprising an outer wrapping layer and an inner porous core located inside the outer wrapping layer; The inner porous core is composed of a periodic lattice structure, and the periodic lattice structure is composed of a plurality of periodically repeated unit cells.

7. The 3D printed personalized implant according to claim 6, characterized in that: A base is fixedly arranged on the outer wrapping layer.

8. The 3D printed personalized implant according to claim 7, characterized in that: The base is integrally formed with the outer wrapping layer.

9. The 3D printed personalized implant according to claim 6, characterized in that: The outer wrapping layer and the inner porous core are both made of Ti-6Al-4V alloy material.

10. The 3D printed personalized implant according to claim 6, characterized in that: The unit cell is a tetrahedral porous structure.

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