CN108891020B - Method for manufacturing digital planting guide plate based on fused deposition modeling technology - Google Patents
Method for manufacturing digital planting guide plate based on fused deposition modeling technology Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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Abstract
A manufacturing method of a digital planting guide plate based on fused deposition modeling technology belongs to the field of dentistry. Firstly, obtaining missing tooth bone information of a patient according to oral Cone Beam Computed Tomography (CBCT), obtaining internal soft tissue information of the oral cavity of the patient according to intraoral scanning, importing continuous tomography images into implant design software for computation and analysis to obtain a jaw bone three-dimensional model of the patient, and synthesizing the jaw bone three-dimensional information and the intraoral soft tissue information to obtain a complete intraoral three-dimensional model; and obtaining a three-dimensional model of the implant guide plate according to the complete intraoral three-dimensional model, and layering the three-dimensional digital model of the dental implant guide plate according to the set thickness by using CAD/CAM software to obtain the movement path of the printer extrusion head of each layer. The invention reduces the requirement of the operation on doctors, makes up the shortage of experience of clinicians, and reduces the cost compared with the manufacturing process of other digital technologies. The planting guide plate completely specifies the direction of the mobile phone to be planted, so that the planting operation process is completely performed according to a preoperative plan.
Description
Technical Field
The invention relates to the field of dentistry, in particular to a 3D printing manufacturing method of a digital planting guide plate based on Fused Deposition Modeling (FDM) technology.
Background
The oral implantation technology develops rapidly in recent years, the indications are wider and wider, but the accompanying implantation complications are increased, and the number of additional operation types is increased. When the implant is implanted into the jaw bone, once the clinical implanters do not accurately control the implantation direction and depth of the implant, important anatomical structures are likely to be damaged, and serious postoperative complications occur. Therefore, it is particularly important to precisely control the direction and position of implant implantation and avoid important anatomical structures.
Clinical practice proves that the key point of successful implantation operation lies in making a correct and reasonable treatment scheme before an operation, and a guarantee and a means are provided for the exact implementation of the scheme, so that the site, the direction, the angle and the like of the implant implantation are consistent with the scheme before the operation, and the implantation scheme is accurately realized in the mouth of a patient. At present, two methods are mainly used for realizing precise operation, one is real-time navigation, and the other is a digital implantation surgical guide plate.
In real-time navigation surgery, a doctor can adjust the implantation position, direction and angle at any time according to navigation information so as to achieve optimal implantation positioning. Theoretically, real-time navigation better meets the requirements of the implant operation, but researches show that a navigation system is easy to generate tracking errors and vertical deviation to cause inconsistency of display with reality, the technology is not mature, and the method is not the current international mainstream technology. The digital implant guide plate technology can design the implant site, angle, direction and length of the implant according to the three-dimensional jaw information of the oral cavity of the patient before the operation, avoid important anatomical structures and lesion areas, or fully utilize the specific structural advantages of the patient, minimize the operation risk, realize the integration of the pre-designed prosthesis information into the implant design, and really realize the implant design and implementation taking the repair as the guide.
With the development of digital medicine, 3D printing technology is widely applied, and a digital dental implant surgical guide plate manufactured based on the principle of 3D printing technology has the advantages of well controlling the implant implantation direction, angle and depth, reducing the operation risk, reducing the operation time, realizing minimally invasive non-flap implant and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a tooth implantation immediate implantation restoration scheme based on an FDM3D printing technology, so that the requirement of an operation on a doctor is reduced, the defect of experience of a clinician is made up, and meanwhile, the cost is reduced compared with the cost in the manufacturing process of other digital technologies. The planting guide plate completely specifies the direction of the mobile phone to be planted, so that the planting operation process is completely performed according to a preoperative plan.
In order to achieve the purpose, the manufacturing method of the digital planting guide plate based on the fused deposition modeling technology comprises the following steps:
A. scanning the oral cavity of a patient to obtain an intraoral three-dimensional model of the patient;
B. obtaining a three-dimensional model of the planting guide plate according to the intraoral three-dimensional model and the position of the implant to be planted;
C. and guiding the three-dimensional model of the planting guide plate into an FDM3D printer to print to manufacture the planting guide plate.
In the digital FDM3D printing planting guide plate manufacturing method, the step A specifically comprises the following steps: firstly, tooth missing bone information of a patient is obtained according to CBCT (cone beam computed tomography) in the oral cavity, soft tissue information in the oral cavity of the patient is obtained according to intraoral scanning, a jaw bone three-dimensional model of the patient is obtained by introducing continuous tomography images into implant design software for computation and analysis, and the jaw bone three-dimensional information and the intraoral soft tissue information are integrated to obtain a complete intraoral three-dimensional model.
In the digital FDM3D printing planting guide plate manufacturing method, the step B specifically comprises the following steps: and according to the complete intraoral three-dimensional model, combining anatomical information of each tissue and the required position and angle of the implant in implant design software to obtain the three-dimensional model of the implant guide plate.
In the manufacturing method of the digital FDM3D printing planting guide plate, the specific method in the step C is as follows:
after obtaining the three-dimensional model of the implant guide plate, layering the three-dimensional digital model of the dental implant guide plate according to the set thickness (generally 0.06-0.25mm) by utilizing CAD/CAM software to obtain the motion path of the printer extrusion head of each layer.
Wherein tooth implant guide FDM3D printer its characterized in that: the heating nozzle is controlled by a computer to do X-Y plane motion according to the section profile information of a product part, the thermoplastic filamentous material is sent to the hot melting nozzle by the wire supply mechanism, heated and melted into semi-liquid state in the nozzle, then extruded out, selectively coated on a workbench, and rapidly cooled to form a thin sheet profile with the thickness of about 0.127 mm. And after the section of one layer is formed, the workbench descends by a certain height, then cladding of the next layer is carried out, the section outline is like to be 'drawn' layer by layer, and the steps are repeated, so that the three-dimensional product part is finally formed.
The FDM printer is made of medical P L A, the material is melted into plastic wires at about 200 ℃, and the plastic extrusion nozzles are used for carrying out three-dimensional printing on the model according to model layering information.
The FDM3D printer is different from a traditional FDM3D printer in printing according to an X coordinate system, a Y coordinate system and a Z coordinate system, and the printing technology is called as a three-column parallel 3D stereoscopic printing technology. The printer adopting the structure can not only improve the printing efficiency better in the printing process, but also improve the precision of the technology when processing the model with the circular arc edge.
The manufacturing method of the digital planting guide plate based on the fused deposition modeling technology comprises the following steps:
A. the scanning device is used for acquiring the intraoral three-dimensional model of the patient and jaw information;
B. the digital implantation guide plate design software system is used for importing the intraoral three-dimensional model and jaw information and obtaining an implantation guide plate three-dimensional model according to the intraoral three-dimensional model and the jaw information;
the FDM3D printer is made of medical P L A, and is different from a traditional FDM3D printer in printing according to a Cartesian (X, Y, Z) coordinate system, and the printing technology is called as a three-column parallel 3D three-dimensional printing technology.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a digital planting guide plate based on fused deposition modeling technology according to the present invention.
Fig. 2 is a schematic structural diagram of a three-dimensional model of the planting guide plate or the planting guide plate in the digital planting guide plate manufacturing method based on the fused deposition modeling technology.
Fig. 3 is a schematic structural diagram of a three-column parallel FDM3D printer used in the method for manufacturing the digital planting guide plate based on the fused deposition modeling technology.
Fig. 4 shows a hardware structure of an FDM3D printer control system in the fused deposition modeling based digital planting guide plate manufacturing method.
Fig. 5 is a structural block diagram of the manufacturing method of the planting guide plate based on the digital FDM3D printing technology.
Detailed Description
The invention provides a method and a system for manufacturing a digital planting guide plate, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the method for manufacturing a digital planting guide plate based on fused deposition modeling of the present invention includes the following steps:
a10, scanning the oral cavity of the patient and obtaining the three-dimensional model of the oral cavity of the patient. The method specifically comprises the following steps:
a110, extending a scanning probe of an intraoral scanner into the mouth of a patient with edentulous teeth, scanning the intraoral surface of the patient, and importing scanning result data into medical image software to generate intraoral three-dimensional digital image data. In particular, when there is a plaster model or a silicone rubber impression, the plaster model or the silicone rubber impression is scanned to acquire intraoral three-dimensional digital image data.
And A120, acquiring CBCT data of the dental jaw bone of the patient. Specifically, CBCT equipment is adopted to scan jaw bone parts of a patient from the outside to obtain skull CBCT data.
And A130, introducing the intraoral three-dimensional digital image data of the patient obtained by the intraoral scanner and the jaw CBCT data obtained by the CBCT equipment into an implantation scheme design system together for data overlapping and combination, establishing an intraoral three-dimensional model, and measuring the thickness of the mucosa through the intraoral three-dimensional model. The intraoral three-dimensional model comprises the bone structure of the skull of the patient and the structure of the mucosa (soft tissue) of the patient, and information such as the thickness of the mucosa can be obtained through the measurement of the planting scheme design software, so that a doctor can conveniently analyze the range of the mucosa to be cut in the later operation.
The method for manufacturing the planting guide plate comprises planting scheme design software and a computer provided with the planting scheme design software, in the embodiment, the planting scheme design software is Simplan, and other design software with similar functions can be adopted, and the invention is not limited.
And A20, obtaining the three-dimensional model of the guide plate according to the complete intraoral three-dimensional model and the position and angle information of the implant to be implanted. Specifically, a three-dimensional model of the planting guide plate is obtained through the design of planting design software. Since the physician needs to inform the software engineer of the surgical drill site and the size of the wound.
Therefore, the step a20 specifically includes a210, that is, designing the three-dimensional model body of the implant guide according to the depth, position, angle, etc. of the implant, as shown in fig. 2 and 210.
A220, in consideration of the fixing position, etc., the fixing manner is determined according to an example, which is a tooth support type fixing manner, and thus, it is not necessary to provide a fixture fixing hole.
And A30, importing the obtained planting guide plate into slicing software to obtain slicing data for preparation before printing, and specifically importing the digital model of the planting guide plate obtained in the previous step into Cura slicing software to perform integral repairing operation of the model. And marking the model after the repairing is finished, selecting a surface needing to generate the support, and then adding the support for preparation before printing. And after the support is added, slice derivation can be carried out, and a slice G code is generated. The present example uses a slice thickness of 0.1 mm.
A40, importing slicing completion data into the three-upright-column parallel-arm type 3D printer for printing, wherein the printer adopts a printing speed of 40-60mm/min, the heating temperature of a printing nozzle is 210 ℃, a point-support type support structure is adopted, and a printing material is a medical P L A material with the diameter of 1.75mm and the printing flow rate of 90%.
Therefore, the manufacturing method of the digital planting guide plate based on the FDM3D printing technology improves the precision in actual operation by simulating the implantation process of the implant in 3D planting guide plate design software. And the three-dimensional model of the implantation guide plate is designed according to the complete three-dimensional data in the patient mouth, and the implant is accurately implanted through the implantation guide plate.
Fig. 2 shows a three-dimensional model of the implant guide, and also shows an implant guide body actually manufactured from the three-dimensional model, and since the shapes thereof are completely the same, the three-dimensional model and a printed real object are shown in the same drawing. The implant guide body 210 is in contact with the teeth to position the surgical site. The guide plate holes 220 may comprise only one guide plate hole, or two or more guide plate holes, as determined by the patient's edentulous condition. The guide plate holes 220 correspond to the implant implantation locations. That is, in which position the tooth needs to be implanted, guide plate holes (single or multiple holes) are provided in which position corresponding to the implant guide plate body 210, which is convenient for positioning the drill holes during the operation of the doctor. The implant is installed in a hole drilled by a surgical instrument, and a dental prosthesis is formed after a crown is arranged on the implant. The implant corresponds to the position of the defective tooth of the patient.
Based on the digital FDM3D printing planting guide plate manufacturing method provided by the embodiment, the invention also provides a three-upright-column parallel-arm FDM3D printer, as shown in FIG. 3.
The three-column parallel arm type FDM3D printer is characterized in that the whole frame ① is a regular triangular prism built by an aluminum profile, the whole size of the printer is 60cm, the side length of the triangular prism is 30cm, three side edges of the triangular prism are provided with a slide rail ③, the verticality and rigidity of the slide rail are guaranteed by means of the machining precision of the side edges of the aluminum profile, three stepping motors are installed below the guide rail, the stepping motors drive a synchronous pulley on a shaft to do rotary motion, the synchronous pulley drives a synchronous belt fixed with a sliding block to convert the rotary motion of the synchronous pulley into linear motion of the sliding block and drive the sliding block to move up and down on the guide rail, the sliding block is connected with a printer nozzle by virtue of a connecting rod, when the sliding block moves up and down, the nozzle is pulled by virtue of the rigidity of the connecting rod, the position of the printer head is controlled, raw materials required for printing are sent from the upper part of the printing head by virtue of a polyethylene pipe, power required for sending the strip materials is provided by one stepping motor, a working plane is positioned at the bottom layer of the printer, the printer is integrally opened frame, and the printer is convenient for expansion.
The printer adopts MGN series linear guide rails, the actual linearity of the guide rail ③ is within 0.025mm/m, the clearance between a V-shaped groove of the guide rail and the slider is controlled within 0.03mm, the three-upright parallel arm type FDM3D printer slider ④ is in ball contact with the guide rail ③, the friction resistance is 6N, the rated dynamic load is 2000N, the size of a T2020 aluminum profile is combined, an MGN9C slider guide rail is selected, and a T-shaped nut is selected as a fixing piece ② between the guide rail and the aluminum profile.
The model of the ball bearing of the three-upright-column parallel-arm type FDM3D printer is selected to be NHS3, the connecting rod ⑤ matched with the ball is a titanium alloy connecting rod with the diameter of phi 3mm, the maximum rotating speed of a 42 stepping motor is 800r/min, the rated torque is 0.55 N.m, the step precision is 5%, when the three-upright-column parallel-arm type FDM3D printer stops traveling, the maximum static torque of 5.5 N.m can be kept, the sliding block is effectively prevented from sliding down along the sliding rail under the action of self gravity, and therefore the three 42 stepping motors are used as driving devices of the positioning device of the 3D printer.
As shown in fig. 4, in order to make the 3D printer work smoothly, the three-column parallel arm type FDM3D printer is constructed as an NC embedded PC type open numerical control system. The PC is used as a hardware platform and is connected with an AVI single chip microcomputer through an interface, and the single chip microcomputer controls the step motor S4 to rotate so as to control the movement of the printing nozzle. Namely, a dual-CPU system based on an upper computer S1 and a lower computer S2 is adopted, and a PC is used as the upper computer S1 and is responsible for converting the contour of a part into a track of the printing head in the space and inputting the track into the lower computer S2 through an interface. The lower computer is responsible for controlling the work of the stepping motor S4 in real time, receiving the feedback information of the monitoring part and adjusting the printer in real time.
The upper computer S1 runs on a Windows system platform, transmits each parameter adjustment to the lower computer S2 through a visual window, receives monitoring information transmitted back by the lower computer S2, and displays the monitoring information in the visual window in a chart form. The lower computer S2, namely the AVI single chip microcomputer, receives the signal transmitted by the upper computer S1 when working, and controls the running of the stepper motor S4 through pulse output, thereby controlling the position of the printing head. The minimum stroke of the stepping motor S4 is one sixteenth step (0.1 degrees), and the maximum speed is 270 mm/S. To ensure printer operating speed, the step angle is set to 1.8 °. And receiving feedback information of the thermistor of the heating module S3, monitoring the temperature of the nozzle heating device, and adjusting the temperature of the heating module in real time. The temperature detection range is-55-1000 ℃; the working temperature of the printing head is 220 ℃; the heat preservation amplitude is +/-5 ℃; the temperature measurement precision is +/-1.5 ℃; the detection frequency was 0.2 s/time.
Based on the above embodiment, the present invention further provides a digital implantation guide manufacturing system based on the FDM3D printing technology, as shown in fig. 5, the system includes a scanning device 10, implantation guide design software 20, and an FDM3D printer 30.
The scanning device 10 is used for scanning the oral cavity of a patient to obtain an intraoral three-dimensional model of the patient. Specifically, the scanning device 10 includes an intraoral scanner and a CBCT apparatus.
The intraoral scanner is used for acquiring intraoral three-dimensional digital images of a patient. The invention adopts a full true color intraoral scanning technology, preferably a Danish 3Shape Trios scanner, uses a tiny scanning head to extend into the oral cavity of a patient and uniformly scan along the surface of a dental crown and a dental bridge of the patient, can accurately and quickly scan the intraoral true condition, can clearly and accurately distinguish the colors of gingiva and teeth, and provides a convenient, reliable and effective way for real-time study of the disease between doctors and patients.
The CBCT equipment is used for acquiring the CBCT data of the skull of the patient so as to obtain the three-dimensional oral cavity image of soft and hard tissues in the mouth of the patient. The instrument used was a Newtom italy high precision CBCT scanner. The intraoral scanner only adopts a digital mold-taking mode to replace the traditional silicon rubber mold-taking mode, and when a three-dimensional module of the planting guide plate is manufactured in a digital mode, the three-dimensional digital image in the mouth of a patient and the three-dimensional oral cavity image of soft and hard tissues in the mouth of the patient need to be integrated. Because the intraoral three-dimensional scanning image can only reflect the outline of the shape inside and outside the outlet, the CBCT image can clearly project the position information of the alveolar bone and the neural tube positioned inside.
The implant guide design software 20 is configured to overlap and combine data of the patient intraoral three-dimensional digital image data acquired by the intraoral scanner with data of the patient skull CBCT data acquired by the CBCT device to create an intraoral three-dimensional model. And obtaining (specifically, designing) a three-dimensional model of the planting guide plate according to the intraoral three-dimensional model. In this embodiment, the planting guide design software is simplex 3D planting guide design software, but other design software with similar functions may also be adopted, and the present invention is not limited thereto.
And the FDM3D printer 30 is used for manufacturing the bone cutting guide plate and the implanting guide plate according to the three-dimensional model of the bone cutting guide plate and the three-dimensional model of the implanting guide plate. In this embodiment, adopt three stand parallel arm-type FDM3D printers preparation to plant the baffle, its cost of manufacture is low, fast and the precision is higher than general printer. Through the planting baffle of 3D printer preparation, be the integral structure, not only pleasing to the eye but also sound construction after the aftertreatment.
In summary, the 3D printer based on the FDM principle adopted by the embodiment is used for manufacturing the planting guide plate for the planting operation, and the method has the characteristics that (1) compared with the 3D printer based on the S L M and D L P principles, the FDM printer is desktop-shaped, small in size, simple to operate and multiple in selectable material types, (2) the printing speed is high, the guide plate model printed by the embodiment takes 2 hours on average, (3) the printer and consumables used for printing are low in price, and (4) in the aspect of printing accuracy, although the FDM technology has a certain difference relative to the D L P and S L M technologies, the FDM technology can meet the basic requirements of the guide plate for the planting operation.
Therefore, the personalized implant guide plate prepared by the FDM technology improves the implant implantation accuracy, reduces the operation risk, shortens the operation time, and simultaneously greatly reduces the medical cost of patients to benefit more patients.
Claims (2)
1. A method for manufacturing a digital planting guide plate based on fused deposition modeling technology,
firstly, obtaining missing tooth bone information of a patient according to oral Cone Beam Computed Tomography (CBCT), obtaining internal soft tissue information of the oral cavity of the patient according to intraoral scanning, importing continuous tomography images into implant design software for computation and analysis to obtain a jaw bone three-dimensional model of the patient, and synthesizing the jaw bone three-dimensional information and the intraoral soft tissue information to obtain a complete intraoral three-dimensional model; according to the complete intraoral three-dimensional model, combining anatomical information of each tissue and the required position and angle of the implant in implant design software to obtain a three-dimensional model of the implant guide plate; after the three-dimensional model of the implant guide plate is obtained, layering the three-dimensional digital model of the dental implant guide plate according to the set thickness by using CAD/CAM software to obtain the motion path of the printer extrusion head of each layer;
the equipment used in the method comprises:
A. the scanning device is used for acquiring the intraoral three-dimensional model of the patient and jaw information;
B. the digital implantation guide plate design software system is used for importing the intraoral three-dimensional model and jaw information and obtaining an implantation guide plate three-dimensional model according to the intraoral three-dimensional model and the jaw information;
C. the FDM3D printer is used for printing and manufacturing the planting guide plate according to the three-dimensional model of the planting guide plate, is made of medical P L A and is a three-column parallel 3D printer;
the method is characterized in that: the FDM3D printer is constructed into an NC embedded PC type open numerical control system; the PC is used as a hardware platform and is connected with an AVI single chip microcomputer through an interface, and the single chip microcomputer controls a stepping motor S4 to rotate so as to control the movement of the printing nozzle; the method is characterized in that a double-CPU system based on an upper computer S1 and a lower computer S2 is adopted, and a PC (personal computer) is used as the upper computer S1 and is responsible for converting the contour of a part into a track of a printing head travelling in space and inputting the track into the lower computer S2 through an interface; the lower computer is responsible for controlling the work of the stepping motor S4 in real time, receiving the feedback information of the monitoring part and adjusting the printer in real time;
the upper computer S1 runs on a Windows system platform, transmits each parameter adjustment to the lower computer S2 through a visual window, receives monitoring information transmitted back by the lower computer S2 at the same time, and displays the monitoring information in the visual window in a chart form; the lower computer S2, namely the AVI singlechip, receives the signal transmitted by the upper computer S1 when working, and controls the running of the stepper motor S4 through pulse output, thereby controlling the position of the printing head; the minimum stroke of the stepping motor S4 is one sixteenth step, and the maximum speed is 270 mm/S.
2. The method of claim 1, wherein: the FDM3D printer sets the step angle to 1.8 °; receiving feedback information of a thermistor of the heating module S3, monitoring the temperature of the nozzle heating device, and adjusting the temperature of the heating module in real time; the temperature detection range is-55 to 1000°C, the working temperature of the printing head is 220°C, the heat preservation amplitude is +/-5°C, the temperature measurement precision is +/-1.5°C, detecting frequency is 0.2 s/time.
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| CN110202143B (en) * | 2019-06-13 | 2020-07-03 | 北京科技大学 | 3D printing forming method of titanium alloy ring with concave-convex character on surface |
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