Dual auxiliary positioning device for micro-implant assisted rapid expansion of maxillary arch and manufacturing method of maxillary rapid expansion device

Abstract

The application provides a double auxiliary positioning device for micro-implant assisted rapid expansion of upper jaw and a manufacturing method of the upper jaw rapid expander, the auxiliary positioning device comprises a first positioning device and a second positioning device for positioning an implant fixed base and a screw expander respectively; when the upper jaw rapid expander is assembled, the screw expander is clamped and fixed on the base in the best installation position; and a metal ring is fixed on the positioning column, the screw expander is connected with the ring through a steel wire, the metal ring fixed on the positioning column and the steel wire are welded and fixed, and the metal ring serves as the implant fixed base. The positioning column and the positioning base provide positioning for the implant and the screw expander respectively, so that the installation position of the finally formed upper jaw rapid expander in the mouth is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the precise positioning of the maxillary rapid expansion device, in particular to a double auxiliary positioning device for micro-implant assisted maxillary rapid expansion and a method for manufacturing the maxillary rapid expansion device. BACKGROUND

[0002] Micro-implant assisted rapid palatal expansion (MARPE) is a kind of orthodontic technology for rapidly expanding the palatal suture of the maxilla to correct maxillary bone narrowness. The MARPE appliance generally consists of a screw expander and four small micro-implants, which are inserted into the palatal bone plate of the maxilla through the gum, and the screw expander is installed on the top of the oral cavity. The micro-implant serves as a fixed point for the expander, and by rotating the screw device of the screw expander at a higher frequency, more efficient and effective palatal expansion is achieved.

[0003] Compared with traditional palatal expansion devices, the MARPE appliance has several advantages, including: 1. The implant of the micro-implant can directly apply expansion force to the palatal bone on both sides of the palatal suture, thereby achieving more controllable and predictable expansion; 2. MARPE treatment time is faster compared to traditional expansion devices; 3. MARPE is relatively small in volume, and patients are more comfortable; 4. MARPE appliances have fewer side effects compared to traditional expansion devices, such as significantly reducing molar tilting or root damage, etc.

[0004] Since MARPE is a method of applying micro-implants to penetrate the mucosa and bone plate of the palate for fixation, it is a method with certain trauma. Therefore, whether this method can achieve more ideal results and reduce adverse side effects depends on the accurate positioning of the micro-implant and the screw expander. If the micro-implant is not implanted long enough, it will affect the fixation of the MARPE, and if it is implanted too deep, it is easy to cause damage to the nasal mucosa, causing nasal bleeding and other symptoms, and may also cause damage to the tooth root due to the wrong direction of the implant. However, there is currently no ideal method for positioning the micro-implant and the screw expander.

[0005] With the rapid development of digital technology in recent years in orthodontics, some traditional work processes in orthodontics have been changed. With the widespread clinical application of cone beam computed tomography (CBCT), intraoral scanning / model scanning, and 3D printing technology, digital measurement and positioning of the micro-implant assisted maxillary rapid expansion device have become possible. There are two problems to be solved: 1. Accurate positioning of the micro-implant in the palate; 2. Achieving stability of the palatal expander in the later manufacturing process. SUMMARY

[0006] The application provides a double auxiliary positioning device for micro-implant assisted rapid expansion of maxillary arch, and the rapid expansion of maxillary arch device comprises a spiral expander, both sides of the spiral expander are connected with a ring through a steel wire, and the spiral expander or the steel wire is fixedly connected with an implant fixing base, after the rapid expansion of maxillary arch device is assembled on a printed maxillary entity model based on a digital three-dimensional model of a patient's oral cavity, the rapid expansion of maxillary arch device is transplanted into the oral cavity, and the implant penetrates through the implant fixing base to fixedly connect the rapid expansion of maxillary arch device with the maxillary bone plate,

[0007] The auxiliary positioning device comprises a first positioning device and a second positioning device for positioning the implant fixing base and the spiral expander respectively.

[0008] The first positioning device comprises a positioning column and a metal ring, the positioning column is fixed on the maxillary entity model, and the metal ring cannot rotate when being sleeved on the positioning column.

[0009] The second positioning device comprises a positioning base and an upper cover which can be detachably buckled together, the buckling surfaces of the positioning base and the upper cover are both provided with positioning grooves which are matched with the outer contour of the spiral expander, and the positioning base is fixed on the maxillary entity model.

[0010] The positioning column and the positioning base are integrally formed with the maxillary entity model which is printed based on the digital three-dimensional model of the patient's oral cavity.

[0011] The spiral expander is installed on the positioning base and the upper cover is buckled to clamp and fix the spiral expander, the both sides of the spiral expander are fixedly connected with the ring through the steel wire, the metal ring which is sleeved on the positioning column is welded with the steel wire or the spiral expander to form the rapid expansion of maxillary arch device, and the metal ring is used as the implant fixing base.

[0012] Further, the metal ring is a groove ring which is provided with a groove on the outer circumferential surface.

[0013] Further, the positioning column is a tapered column which is narrow at the top and wide at the bottom, the central hole of the metal ring is a tapered hole which is wide at the top and narrow at the bottom, and the inner diameter of the bottom of the tapered hole is equivalent to the outer diameter of the bottom of the tapered column.

[0014] The auxiliary positioning device further comprises a pressing cap, the lower end surface of the pressing cap is provided with a tapered convex ring, the pressing cap is pressed on the upper end surface of the metal ring which is sleeved on the positioning column, and the inner and outer walls of the tapered convex ring are wedge-shaped matched with the outer diameter of the positioning column and the central hole of the metal ring respectively.

[0015] Further, the positioning base is detachably connected with the upper cover through buckling.

[0016] A manufacturing method of the micro-implant assisted rapid expansion of maxillary arch device of the double auxiliary positioning device, and the manufacturing method comprises the following steps:

[0017] S1, obtaining a digital three-dimensional model of a patient's oral cavity;

[0018] S2, the first positioning device and the digital model of the micro-implant are introduced into the digital three-dimensional model of the oral cavity, and the digital model of the screw expander and the second positioning device is fitted into the digital three-dimensional model of the oral cavity after fitting;

[0019] S3, the positioning column and the micro-implant are precisely fitted, the position of the first positioning device digital model is adjusted in the digital three-dimensional model of the oral cavity until the ideal implantation position of the micro-implant, so as to determine the position of the first positioning device, and the position of the second positioning device is adjusted according to the position of the positioning column;

[0020] S4, the band ring is designed based on the tooth profile of the digital three-dimensional model of the oral cavity;

[0021] S5, the digital model of the auxiliary device is fitted with the digital three-dimensional model of the oral cavity, and the maxillary entity model with the positioning column and the positioning base is printed by using 3D printing technology, and the upper cover is printed separately;

[0022] S6, the screw expander is installed into the positioning groove of the positioning base and buckled with the upper cover to clamp and fix the screw expander, and the pre-prepared metal ring is fixed on the positioning column;

[0023] S7, the prepared metal band ring is placed on the two sides of the teeth of the maxillary entity model, the two sides of the screw expander are fixedly connected with the band ring through the steel wire, and the metal ring is welded with the steel wire or the screw expander to form the maxillary rapid expansion arch expander, and the metal ring is used as the implant fixation base;

[0024] S8, the upper cover is removed, and the prepared maxillary rapid expansion arch expander is taken off.

[0025] Further, in step S1, after CBCT scanning and intraoral tooth scanning, the CBCT scanning model is fitted with the intraoral tooth scanning model to obtain the digital three-dimensional model of the oral cavity of the patient.

[0026] Further, in step S3, each positioning column in the digital three-dimensional model of the oral cavity penetrates through the bone cortex of the palatine bone plate close to the nasal cavity side, and the height of the positioning column tip protruding from the bone cortex is within 0.5mm.

[0027] The innovation of the application lies in:

[0028] 1) After the first positioning device, the implant nail, the second positioning device, and the screw expander are introduced into the patient's upper jaw digital three-dimensional model, the relative position of the first positioning device and the patient's upper jaw is adjusted so that the implant nail implant position is located in the ideal position, and then the position of the second positioning device is fine-tuned according to the position of the first positioning device. The first positioning device, the second positioning device, and the patient's upper jaw digital three-dimensional model are fitted as a functional unit, and the patient's upper jaw, the positioning column part of the first positioning device, and the base part of the second positioning device are printed as a whole in the later stage. When assembling the upper jaw rapid expansion arch expander, the screw expander is clamped and fixed on the base in the best installation position, and the metal ring is fixed on the positioning column. After the screw expander is connected to the ring through the steel wire, the metal ring and the steel wire are welded and fixed, and the metal ring serves as the implant nail fixing base. As can be seen, the positioning column and the positioning base provide positioning for the implant nail and the screw expander, respectively, so that the final shaped upper jaw rapid expansion arch expander has a more accurate installation position in the mouth.

[0029] 2) Before printing, the position and drilling depth of the micro-implant nail are positioned in the model. After the upper jaw rapid expansion arch expander is assembled and installed in the mouth, the micro-implant nail is screwed through the metal ring and has the same ideal implant position depth as the model, which reduces the damage to the patient and improves the retention of the upper jaw rapid expansion arch expander. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The schematic diagram of the patient's oral digital three-dimensional model obtained by fitting the CBCT scanning model and the intraoral tooth scanning model of the present application;

[0032] Figure 2 The schematic diagram of the positioning column of the first positioning device, the metal ring, and the implant nail after fitting, and the positioning base of the second positioning device and the screw expander after fitting, which are introduced into the digital three-dimensional model of the patient's oral cavity;

[0033] Figure 3 The cross-sectional view of Figure 2 ;

[0034] Figure 4 The schematic diagram of adjusting the positions of the first and second positioning devices and fitting the cap based on Figure 2 ; and

[0035] Figure 5 A diagram for designing a band in a digital model;

[0036] Figure 6 A diagram of a maxillary rapid expansion appliance assembled on a printed patient maxillary physical model;

[0037] Figure 7 A model diagram for fitting the implant and the first positioning device together;

[0038] Figure 8 A sectional view of the first positioning device;

[0039] Figure 9 A perspective view of the cap. DETAILED DESCRIPTION

[0040] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of skill in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.

[0041] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description in order to explain the technical solutions of the present application. The preferred embodiments of the present application are described in detail as follows, however, the present application can have other embodiments in addition to these detailed descriptions.

[0042] The current method for manufacturing a maxillary rapid expansion appliance is as follows: a maxillary model is printed according to a model and a band is customized, then the band 13 is fitted on the teeth on both sides of the maxillary model, the two sides of the screw expander 11 are connected together with the band 13 through a steel wire, and the implant fixation base is welded on the steel wire. However, this method has the following defects: the implant fixation base and the screw expander 11 do not have auxiliary positioning during installation, and the final fixed position is often not the ideal installation position, which also leads to the installation position of the micro-implant not being the ideal position, and the drilling depth of the micro-implant completely relies on the experience of the doctor, and neither too deep nor too shallow is suitable.

[0043] The present application provides an auxiliary positioning device for micro-implant assisted maxillary rapid expansion, which contains a first positioning device 40 for positioning the implant fixation base, and a second positioning device 30 for positioning the screw expander 11. The structures of the first positioning device 40 and the second positioning device 30 are described further as follows:

[0044] First positioning device 40

[0045] AsFigures 7-9 As shown, the first positioning device 40 includes a positioning post 41, a metal ring 42, and a pressure cap 43. Combined with... Figure 8 and Figures 3-6 As shown, the positioning post 41 is integrally formed with the maxillary solid model 20 printed from the digital 3D model of the scanned patient's oral cavity, with the positioning post 41 protruding vertically from the maxillary surface. A metal ring 42 is fixedly fitted onto the positioning post 41, and a pressure cap 43 is pressed against the upper end face of the metal ring 42 to maintain the relative fixation of the positioning post 41 and the metal ring 42. The positioning post 41 is a tapered post that is narrower at the top and wider at the bottom, and the central hole of the metal ring 42 is a tapered hole that is wider at the top and narrower at the bottom. The lower end face of the pressure cap 43 is provided with a tapered protrusion ring 43-1. The outer wall of the tapered protrusion ring 43-1 is wider at the top and narrower at the bottom, and the inner wall is narrower at the top and wider at the bottom. After the pressure cap 43 is pressed against the upper end face of the metal ring 42, the inner and outer walls of the tapered protrusion ring form a wedge-shaped fit with the outer wall of the positioning post and the central hole of the metal ring, respectively, achieving a pressing and fixing effect. The pressure cap 43 is also easy to disassemble subsequently. In this invention, a metal ring 42 serves as the implant fixation base, and a positioning post 41 and a pressure cap 43 are used to fix the metal ring 42 (which will later become the implant fixation base for the maxillary rapid expander).

[0046] Metal ring 42 is a grooved ring with a groove on its outer circumference, such as Figure 7 and Figure 8 As shown, the grooved ring design is used to facilitate subsequent welding and connection with the steel wire.

[0047] Second positioning device 30

[0048] The second positioning device 30 includes a positioning base 31 and a top cover 32 that are detachably fastened together. Figures 3-5 A schematic diagram is shown showing the second positioning device 30 imported into the digital model after fitting with the spiral expander 11. To better illustrate the spiral expander 11 in the center, [the diagram is shown]. Figures 3-5 The top cover 32 is hidden inside. Figure 6 The final product shows a schematic diagram with the top cover 32 fastened. Both the positioning base 31 and the top cover 32 have positioning grooves on their mating surfaces that conform to the outer contour of the spiral expander 11. The positioning base 31 is integrally formed with the maxillary solid model 20. When the positioning base 31 and the top cover 32 are fastened together, they clamp the spiral expander 11 in the middle, forming a sandwich clamping and positioning mechanism. To ensure the stability of the fastened assembly, the positioning base 31 and the top cover 32 are provided with a snap-fit ​​structure to keep them relatively fixed after fastening. When the top cover 32 is fastened onto the positioning base 31, the two are firmly joined, tightly clamping the spiral expander 11 in the middle and preventing displacement. Furthermore, after the maxillary rapid expander is manufactured, the top cover 32 can be removed to take out the maxillary rapid expander.

[0049] In addition, the positioning base 31 and the upper cover 32 are provided with positioning grooves matched with the outer contour of the spiral expander 11. After the positioning base 31 and the upper cover 32 are buckled, the outer contour of the spiral expander 11 is matched with the positioning grooves of the positioning base 31 and the upper cover 32, the gap between the positioning base 31, the upper cover 32 and the spiral expander 11 is eliminated, so that the spiral expander 11 and the sandwich auxiliary device 30 are firmly combined into one body. Since the positioning base 31 is integrally printed with the upper jaw solid model 20, it means that the position of the spiral expander 11 between the positioning base 31 and the upper cover 32 after buckling is equivalent to the installation position in the patient's mouth.

[0050] The following will further illustrate the method for manufacturing the upper jaw rapid expander based on the auxiliary positioning device of the application:

[0051] Step S1, obtaining a digital three-dimensional model of the patient's oral cavity. In the present application, the digital three-dimensional model of the oral cavity is obtained by fitting the cone beam computed tomography model CBCT and the intraoral scanning / model scanning model. The specific steps are as follows: 1. Obtain the data of the soft and hard tissues in the patient's mouth by CBCT scanning, and three-dimensionally reconstruct the CBCT model; 2. Obtain the three-dimensional digital image of the surface information of the patient's teeth and mucosa by intraoral 3D optical scanning; 3. Accurately reconstruct the target tissue by combining the CBCT scanning model with the three-dimensional optical scanning model. Finally, the digital three-dimensional model of the upper jaw of the oral cavity is obtained as shown in the figure. Figure 1

[0052] Step S2, fitting the digital models of the first positioning device 40 and the micro-implant 14 into the digital three-dimensional model of the oral cavity, and fitting the digital models of the spiral expander 11 and the second positioning device 30 into the digital three-dimensional model of the oral cavity.

[0053] Step S3, fitting the digital models of the first positioning device 40 and the micro-implant 14 into the digital three-dimensional model of the oral cavity, and fitting the digital models of the spiral expander 11 and the second positioning device 30 into the digital three-dimensional model of the oral cavity. Figure 6 Figure 3 ​​The fitted first positioning device 40 and the micro-implant digital model are inseparable, and the fitted screw expander 11 and the second positioning device 30 digital model are also inseparable. It should be noted that the micro-implant, the screw expander 11, the first positioning device 40 and the second positioning device 30 are all prefabricated, so the digital models of the four components are ready-made and can be directly imported into the digital three-dimensional model of the oral cavity after fitting. In addition, in the digital model, the fitted micro-implant 14 is fitted with the conical center hole of the metal ring 42 to ensure that the micro-implant 14 on the metal ring 42 is in the tightened position in the model. The state of the fitted screw expander 11 and the second positioning device 30 digital model is that the positioning base and the upper cover tightly hold the screw expander 11 in the middle.

[0054] The position of the first positioning device 40 digital model is adjusted in the digital three-dimensional model of the oral cavity until the micro-implant 14 is in the ideal implantation position, so as to determine the position of the first positioning device 40, and then the position of the second positioning device 30 is adjusted according to the position of the positioning column 41. For example, if the maxillary rapid expander is configured with two implant fixation bases, the center line of the second positioning device 30 is located on the central axis of the two positioning columns 41, as shown in Figure 2 .

[0055] It has been recorded in the background art that the implantation of the micro-implant is too deep, which causes greater trauma to the patient, and the implantation is too shallow, which does not play a role in retaining the screw expander 11. After comprehensive consideration, the micro-implant in the digital three-dimensional model of the oral cavity penetrates through the bone cortex of the palatine bone plate near the nasal cavity side, and the height of the micro-implant tip protruding from the bone cortex is within 0.5mm, which reduces the damage to the patient and improves the retention of the screw expander 11.

[0056] Step S4, design the band ring 13 on both sides of the tooth contour based on the digital three-dimensional model of the oral cavity, as shown in Figure 4 .

[0057] Step S5, fit the auxiliary device digital model containing the first positioning device 40 and the second positioning device 30 with the digital three-dimensional model of the oral cavity, and use 3D printing technology to integrally print the maxillary solid model 20 with the positioning column 41 and the positioning base 31, while the pressure cap 43 and the upper cover 32 are separately printed.

[0058] Step S6, install the screw expander 11 into the positioning groove of the positioning base 31 and fasten the upper cover 32 to firmly fix the screw expander 11 in the middle. And the prefabricated metal ring 42 is fixedly placed on the positioning column 41 and the pressure cap 43 is clamped to fix the metal ring 42.

[0059] Step S7, the prepared metal band ring 13 is sleeved at the teeth on both sides of the upper jaw solid model 20, the steel wire 12 is used to fixedly connect both sides of the screw expander 11 with the band ring 13; the metal ring 42 is welded with the steel wire 12 or the screw expander 11 to form the upper jaw rapid expansion bow, and the metal ring 42 is used as the implant nail fixing base;

[0060] Step S8, the upper cover 32 and the pressing cap 43 are disassembled, and the prepared upper jaw rapid expansion bow is removed.

[0061] The preferred embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and that the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application or modify them into equivalent embodiments with equivalent changes without departing from the scope of the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the content of the technical solutions of the present application still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A double auxiliary positioning device for micro-implant assisted maxillary rapid expansion, the maxillary rapid expander comprising a screw expander (11), the two sides of the screw expander (11) being connected with a band ring (13) through a steel wire (12), and the screw expander (11) or the steel wire (12) being fixedly connected with an implant fixing base, the maxillary rapid expander being assembled on a printed maxillary physical model (20) based on a digital three-dimensional model of a patient's oral cavity and then transplanted into the oral cavity, and the implant passing through the implant fixing base to fixedly connect the maxillary rapid expander with the maxillary bone plate, characterized in that the auxiliary positioning device comprises a first positioning device (40) and a second positioning device (30) for positioning the implant fixing base and the screw expander (11) respectively. The first positioning device (40) comprises a positioning column (41) and a metal ring (42), the metal ring (42) being detachably sleeved on the positioning column (41), and the metal ring (42) sleeved on the positioning column (41) being non-rotatable. The second positioning device (30) comprises a positioning base (31) and an upper cover (32) which are detachably buckled together, and the buckling surfaces of the positioning base (31) and the upper cover (32) are each provided with a positioning groove which is fitted with the outer contour of the screw expander (11). The positioning column (41) and the positioning base (31) are integrally formed with the printed maxillary physical model (20) based on the digital three-dimensional model of the patient's oral cavity. The screw expander (11) is installed on the positioning base (31) and the upper cover (32) is buckled to clamp and fix the screw expander (11), the two sides of the screw expander (11) are fixedly connected with the band ring (13) through the steel wire (12), the metal ring (42) sleeved on the positioning column (41) is welded with the steel wire (12) or the screw expander (11) to form the maxillary rapid expander, and the metal ring (42) serves as the implant fixing base. The metal ring (42) is a groove ring provided with a groove on the outer circumferential surface.

2. The dual auxiliary positioning device for micro-implant assisted rapid expansion of the maxillary arch of claim 1, wherein, The positioning column (41) is a tapered column which is narrow at the top and wide at the bottom, the central hole of the metal ring (42) is a tapered hole which is wide at the top and narrow at the bottom, and the inner diameter of the bottom of the tapered hole is equivalent to the outer diameter of the bottom of the tapered column.

3. The dual auxiliary positioning device for micro-implant assisted rapid expansion of the maxillary arch of claim 1, wherein, The auxiliary positioning device further comprises a pressing cap (43), the lower end surface of the pressing cap (43) is provided with a tapered convex ring (43-1), the pressing cap (43) is pressed on the upper end surface of the metal ring (42) sleeved on the positioning column (41), and the inner and outer walls of the tapered convex ring are respectively wedge-shaped matched with the outer diameter of the positioning column (41) and the central hole of the metal ring. The positioning base (31) is detachably connected with the upper cover (32) through buckling.

4. The dual auxiliary positioning device for micro-implant assisted rapid expansion of the maxillary arch of claim 1, wherein, The manufacturing method comprises the following steps:

5. A method for making a micro-implant assisted rapid maxillary expansion appliance based on the dual assistant positioning device according to any one of claims 1-3, characterized in that, S1, obtaining a digital three-dimensional model of a patient's oral cavity; S2, introducing a digital model of the first positioning device (40) and the micro-implant (14) into the digital three-dimensional model of the patient's oral cavity, and fitting a digital model of the screw expander (11) and the second positioning device (30) into the digital three-dimensional model of the patient's oral cavity. ​ S3, precisely digitize the positioning column (41) and the micro-implant, adjust the position of the first positioning device (40) digital model in the oral digital three-dimensional model until the ideal implantation position of the micro-implant, so as to determine the position of the first positioning device (40), and adjust the position of the second positioning device (30) according to the position of the positioning column (41); S4, design the band ring (13) on both sides of the tooth contour based on the oral digital three-dimensional model; S5, fit the auxiliary device digital model with the oral digital three-dimensional model, and print the maxillary entity model (20) with the positioning column (41) and the positioning base (31) by using the 3D printing technology, and print the upper cover (32) separately; S6, install the screw expander (11) into the positioning groove of the positioning base (31) and buckle the upper cover (32) to clamp and fix the screw expander (11), and fix the pre-prepared metal ring (42) on the positioning column (41); S7, place the prepared band ring (13) on both sides of the teeth of the maxillary entity model (20), fix and connect the screw expander (11) on both sides with the band ring (13) through the steel wire (12), and weld the metal ring (42) with the steel wire (12) or the screw expander (11) to form the maxillary rapid expansion arch expander, and the metal ring (42) is used as the implant nail fixing base; S8, remove the upper cover (32) and take off the prepared maxillary rapid expansion arch expander.

6. The manufacturing method as described in claim 5, characterized in that, In step S1, after CBCT scanning and intraoral tooth scanning, the CBCT scanning model is fitted with the intraoral tooth scanning model to obtain the oral digital three-dimensional model of the patient's oral cavity.

7. The manufacturing method as described in claim 5, characterized in that, In step S3, each positioning column (41) in the oral digital three-dimensional model penetrates through the bone cortex of the upper palatal bone plate near the nasal cavity side, and the height of the tip of the positioning column (41) protruding from the bone cortex is within 0.5mm.

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