3D bionic tooth manufacturing method

Abstract

The invention discloses a 3D bionic tooth manufacturing method which comprises the following steps: scanning a tooth model, namely scanning teeth through CBCT (Cone Beam Computed Tomography) equipment to obtain the model; 3D printing of a tooth model: importing the scanned image into 3D printing equipment for 3D printing to manufacture a tooth model, and then scanning the tooth model to manufacture a zirconia model; carrying out sand blasting treatment; baking zirconium oxide; and mounting. According to the method, a CBCT technology is used for scanning and taking a model, a tooth model is modified through 3D drawing software, and then a zirconium oxide tooth model is manufactured, or the tooth model is directly subjected to 3D printing, the tooth model is polished and then scanned to manufacture the zirconium oxide tooth model, and part of the structure is changed, so that the stress is more reasonable, and the zirconium oxide tooth model is subjected to sand blasting treatment through a sand blasting technology; a friction structure is additionally arranged, so that the gluing firmness is improved, the false tooth is more stable after being mounted, and the service life is longer.

Description

Technical Field

[0001] The invention relates to the technical field of denture production, and in particular to a 3D bionic tooth production method. Background Art

[0002] With the improvement of people's oral health awareness and economic level, more and more people are beginning to pay attention to the implant restoration of missing teeth. In order to meet the patients' growing multi-level health needs for oral health, implant restoration is an important part of maintaining oral health.

[0003] Since Branemark of Sweden first used titanium dental implants in clinical practice in 1966, dental implant technology has been widely used in clinical practice after years of development and has become one of the important restorative methods for restoring damaged and missing teeth.

[0004] However, since the implants of various systems are all prefabricated cylindrical implants, their morphology is very different from the natural tooth roots of humans. Whether it is immediate implantation or delayed implantation, like other types of dentures, it is difficult to fully realize the biomechanical state of natural tooth organs. In order to achieve immediate implantation of bionic implants close to the morphology of natural tooth roots, the existing technology uses pure titanium casting technology to develop pure titanium bionic implants, and has successfully completed animal experiments and clinical studies with satisfactory results. In recent years, with the application of 3D printing technology, making personalized oral implants based on the original root morphology has become a new direction in oral implant research. A personalized titanium alloy bionic implant consistent with the original root was made by selective laser melting technology (SLM), laying the foundation for the development of 3D printing technology in the field of oral implants. However, the existing dental implant technology makes tooth models by reverse molding. The dentures produced by this method cannot be polished to ensure adaptability, and the structure cannot be changed, resulting in no structure to increase friction on the surface of the denture, and the denture is easy to loosen after installation.

[0005] Most of the currently available commercial implants are made of dense titanium metal screw materials, whose elastic modulus far exceeds that of human bone tissue. When the implant is under load, it will produce a stress barrier effect with the bone tissue, which will lead to disuse atrophy of the cortical bone. Implants with low elastic modulus are more conducive to transferring interface stress to the surrounding bone tissue when under load, which is beneficial to the long-term stability of the implant. The present invention selects to use 3D printing technology to make and surface-treat zirconia bionic dental implants to achieve diseased tooth organ replacement, so as to improve the success rate of implant restoration and avoid cortical bone disuse atrophy. 3D printing technology and zirconia frosting technology are used to make bionic teeth that are completely consistent with the patient's alveolar socket morphology, and they are implanted immediately. The initial stability and bone integration of the bionic teeth are good. Therefore, we propose a 3D bionic tooth production method to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a 3D bionic tooth manufacturing method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a 3D bionic tooth manufacturing method, comprising the following steps:

[0008] Step S1, scanning the tooth model:

[0009] Scan and take dental impressions using CBCT equipment;

[0010] Step S2, 3D printing tooth model:

[0011] The scanned image is imported into the 3D printing device for 3D printing to make a dental mold, and then the dental mold is scanned to make a zirconia model.

[0012] Step S3, sandblasting;

[0013] Step S4, baking zirconium oxide;

[0014] Step S5, installation.

[0015] Preferably, in step S1, the CBCT device performs digital projection around the tooth model through an X-ray generator.

[0016] Preferably, after scanning with CBCT technology, the image is directly imported into a computer, and the tooth model is refined and part of the structure of the tooth model is changed using 3D drawing software, and then a zirconia model is directly made.

[0017] Preferably, in step S2, the 3D printed tooth model is polished and waxed to increase the friction structure.

[0018] Preferably, in step S3, a sandblasting device is used to impact the surface of the zirconia model to form a rough surface on the surface, thereby generating a micromechanical locking.

[0019] Preferably, in step S5, GelDex hydrogel is prepared, placed in a depression, and the zirconium oxide tooth model is inserted therein to complete the installation of the bionic tooth.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Use CBCT technology to scan and take molds, and then use 3D drawing software to modify the tooth model to make a zirconia tooth model, or directly 3D print the tooth model, polish and wax the tooth model, and then scan and make a zirconia tooth model. Change some structures to make it more reasonable in force. Use sandblasting technology to sandblast the surface of the zirconia tooth model to increase the friction structure and increase the firmness of the adhesive, so that the denture is more stable after installation and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the bionic tooth manufacturing method of the present invention;

[0023] Figure 2 A diagram showing the method for making and installing a bionic tooth according to the present invention;

[0024] Figure 3 This is an X-ray image of the mandibular bionic tooth implanted in the present invention;

[0025] Figure 4 A diagram of the equipment for printing zirconia tooth models according to the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 4 The present invention provides a technical solution: a 3D bionic tooth manufacturing method, comprising the following steps:

[0028] The first step is to scan the tooth model:

[0029] The teeth are scanned and molded using CBCT technology (short for Cone beam CT). Specifically, a cone beam computer reconstruction tomography device is used. The principle is that an X-ray generator uses a relatively low dose of radiation (usually the tube current is around 10 mA) to make a circular digital projection around the tooth model, and then digitally project the area around the teeth. The data obtained from the "intersection" of the projections are reconstructed in a computer to obtain a three-dimensional image of the teeth.

[0030] Step 2: 3D print tooth model:

[0031] The scanned image is imported into the 3D printing device for 3D printing, the printed tooth model is polished, the friction structure is added to form a finished tooth mold, and then the tooth mold is scanned to make a zirconia model;

[0032] As a supplement to the second step, in another embodiment, the CBCT scan can be imported into a computer, and 3D drawing software, such as 3Dmax computer software, can be used to refine the tooth model and change some structures of the tooth model to make it more reasonably stressed, and then it can be directly made into a zirconia model.

[0033] The third step is sandblasting:

[0034] Using sandblasting equipment, under a certain pressure, particles such as A1203 or S02 are used to impact the surface of the zirconia model to form a rough surface on its surface and produce micromechanical locking to improve the bonding effect. In this embodiment, in air with an air pressure of 0.25Mpa, A12O3 particles of 110um are used for vertical sandblasting for 21s to complete the sandblasting of the zirconia tooth model.

[0035] Step 4: Zirconia baking:

[0036] The zirconia tooth model was sintered.

[0037] Step 5, installation:

[0038] In this embodiment, Dex-CHO is dissolved in PBS solution at a concentration of 10% (m / v), and gelatin is dissolved in PBS solution at a concentration of 20% (m / v) to form GelDex gel. Equal volumes of Dex-CHO and gelatin PBS solutions are mixed, and the mixture is placed in a 37-degree water bath for 10 minutes to fully gel and obtain GelDex hydrogel. 1 ml of GelDex hydrogel is placed in the tooth socket, and the zirconia tooth model is inserted to complete the installation of the tooth model. Specific embodiment 1:

[0040] 1.2.1 Fabrication of bionic teeth

[0041] The patient's head CT image was obtained by CBCT technology. The affected tooth was selected using Slicer 5.6.1, and the image was made into an stl file format. 3D Max was used for plastic processing, and the affected tooth model was 3D printed. Dental wax was used for modification to make the bone integration step. The upper surface of the tooth was polished to make it lower than the original occlusal surface to facilitate the subsequent crown installation.

[0042] The model was 3D scanned, printed using zirconia material, and sandblasted before sintering. Sandblasting is the process of using Al2O3 or SiO2 particles to impact the surface of zirconia under a certain pressure to form a rough surface on its surface and produce micromechanical locking to improve the bonding effect. The air pressure is 0.25Mpa, the Al2O3 particles are 110μm, and the vertical sandblasting is 21s, followed by sintering to make a finished zirconia denture. The bionic tooth root is then surface treated with 11.5g / L HF acid and sterilized at high temperature and high pressure for standby use (the production process takes about 3h). The zirconia bionic tooth is cast to be completely consistent with the shape of the natural alveolar socket.

[0043] 1.2.2 Implantation of bionic tooth into alveolar socket and initial stability test

[0044] The patient was given local anesthesia, and the affected tooth was extracted using a conventional sterile drape. The iodoform gauze in the alveolar socket was removed, the socket was scraped, and the socket was repeatedly rinsed with a 0.02 volume fraction H2O2 solution and normal saline.

[0045] In the installation step, Dex-CHO was dissolved in PBS solution at a concentration of 10% (m / v), and gelatin was dissolved in PBS solution at a concentration of 20% (m / v). For the gelation of GelDex: equal volumes of Dex-CHO and gelatin PBS solutions were mixed, and then placed in a 37-degree water bath for 10 minutes to fully gel and obtain GelDex hydrogel. 1 ml was placed in the tooth socket, and the bionic tooth was implanted in the alveolar socket and hammered to make it fully in place. After surgery, take one tablet of amoxicillin every day for 3 consecutive days. Install the upper surface of the crown one month later.

[0046] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for making a 3D bionic tooth, characterized in that: The steps include: Step S1, scanning the tooth model: Scan and take dental impressions using CBCT equipment; Step S2, 3D printing tooth model: The scanned image is imported into the 3D printing device for 3D printing to make a dental mold, and then the dental mold is scanned to make a zirconia model. Step S3, sandblasting; Step S4, baking zirconium oxide; Step S5, installation.

2. A 3D bionic tooth manufacturing method according to claim 1, characterized in that: In step S1, the CBCT device performs digital projection around the tooth model through an X-ray generator.

3. The method for making a 3D bionic tooth according to claim 1, characterized in that: In step S2, after the CBCT scanning, the image is directly imported into the computer, and the tooth model is refined by using 3D drawing software, and the partial structure of the tooth model is changed, and then the zirconia model is directly made.

4. The method for making a 3D bionic tooth according to claim 1, characterized in that: In the step S2, the dental model after 3D printing is polished to increase the friction structure treatment.

5. The method for making a 3D bionic tooth according to claim 1, characterized in that: In the step S3, a sandblasting device is used to impact the surface of the zirconia model to form a rough surface on the surface, thereby generating a micromechanical locking.

6. The method for making a 3D bionic tooth according to claim 1, characterized in that: In step S5, GelDex hydrogel is prepared and placed in the depression, and the zirconium oxide tooth model is inserted therein to complete the installation of the bionic tooth.

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