Manufacturing method of fixed expansion appliance

Abstract

The invention discloses a manufacturing method of a fixed expansion appliance, which comprises the following steps of: performing three-dimensional scanning on an oral cavity to obtain an oral cavity digital model; selecting a real spiral expander with a proper specification according to the oral cavity digital model, and constructing a digital spiral expander which is the same as the real spiral expander in three-dimensional (3D) software; the digital spiral dilator and the oral cavity digital model are combined in three-dimensional software, so that the digital spiral dilator is located at a proper position; designing a digital model of the expansion bracket, and obtaining an entity of the expansion bracket through 3D printing; and welding the arch expansion bracket entity and the real spiral expander into a whole, and then removing the temporary connecting rod on the arch expansion bracket entity to obtain a fixed arch expansion appliance entity. According to the manufacturing method of the fixed expansion appliance, the manufacturing difficulty of the fixed expansion appliance can be reduced, and the manufacturing efficiency and the product quality can be improved.

Description

Technical Field

[0001] The invention relates to a medical device, and in particular to a method for manufacturing an arch expansion appliance. Background Art

[0002] Fixed arch expansion appliance is used to treat maxillary underdevelopment and narrowness, which may lead to crowding, protrusion, crossbite, etc. of the upper dental arch. By widening the upper dental arch and the width of the maxillary bone, the upper dental arch shape is improved and the upper dental arch deformity is alleviated. The fixed arch expansion appliance consists of three parts: a spiral expander, a band ring, and a connecting rod connecting the spiral expander and the band ring.

[0003] The existing method for making a fixed arch expansion appliance is as follows:

[0004] 1) Obtain a 3D digital model of the oral cavity by performing a three-dimensional scan of the oral cavity, and then obtain a physical model of the oral cavity by 3D printing;

[0005] 2) Design the tooth band based on the 3D digital model of the oral cavity, and then obtain the physical band through 3D printing;

[0006] 3) The spiral expander is a standard device. Choose the appropriate model of spiral expander according to the size of the oral physical model;

[0007] 4) welding a connecting rod to the spiral expander to obtain a combination of the spiral expander and the connecting rod;

[0008] 5) Wearing the physical band ring on the teeth of the oral physical model, placing the combination of the spiral expander and the connecting rod in the oral physical model, manually adjusting the position of the spiral expander in the oral physical model, and manually bending the connecting rod to obtain a suitable connecting rod shape;

[0009] 6) Weld the connecting rod and the solid band ring to obtain a fixed arch expansion appliance.

[0010] In the above step 5), manually adjusting the position of the spiral expander and manually bending the connecting rod in the oral physical model requires multiple debugging, which is difficult to operate, inefficient, and difficult to achieve the ideal shape of the fixed expansion appliance. Summary of the invention

[0011] In view of this, an object of the present invention is to provide a method for manufacturing a fixed arch expansion appliance to solve the technical problems in the prior art that the manufacture of a fixed arch expansion appliance requires manual adjustment of the position of a spiral expander and a bent connecting rod in an oral physical model, which is difficult to operate, inefficient, and difficult to achieve an ideal shape of the fixed arch expansion appliance.

[0012] The manufacturing method of the fixed arch expansion appliance of the present invention comprises:

[0013] 1) Perform a three-dimensional scan of the patient's oral cavity to obtain a digital model of the oral cavity;

[0014] 2) Select a suitable real spiral expander according to the oral digital model, and design a digital spiral expander identical to the real spiral expander in 3D software;

[0015] 3) combining the digital spiral expander and the oral digital model in the 3D software, and adjusting the position of the digital spiral expander so that it is in a suitable position in the oral digital model;

[0016] 4) designing a digital model of an expansion bracket connecting the molar and the digital spiral expander in a 3D software, wherein the digital model of the expansion bracket includes a left band ring matched with the left molar on the oral digital model, a left support rod connected to the left band ring, a right band ring matched with the right molar on the oral digital model, a right support rod connected to the right band ring, and a temporary connecting rod connecting the left support rod and the right support rod;

[0017] 5) 3D printing the digital model of the arch expansion stent to obtain an arch expansion stent entity;

[0018] 6) Assemble the arch expansion bracket entity to the real spiral expander and weld the two into one.

[0019] 7) Remove the temporary connecting rod on the arch expansion bracket to obtain a fixed arch expansion appliance.

[0020] Furthermore, adjusting the position of the digital spiral expander in step 3) includes: adjusting the mid-suture position of the digital spiral expander to be parallel to and located near the mid-suture of the palate, and adjusting the digital spiral expander to be 0.3-0.8 mm away from the palatal mucosa.

[0021] Furthermore, the method for manufacturing the fixed arch expansion appliance further comprises step 8): grinding and polishing the fixed arch expansion appliance obtained in step 7).

[0022] Beneficial effects of the present invention:

[0023] The manufacturing method of the fixed arch expansion appliance of the present invention can adjust the position of the digital spiral expander in the 3D software, so that the digital spiral expander can be conveniently adjusted to the ideal position in the oral digital model. The adjustment operation is simple and convenient, and the efficiency is high, thereby improving the wearing comfort of the spiral expander in the oral cavity.

[0024] The shapes of the left and right struts of the arch expansion bracket in the present invention are designed in software and formed by 3D printing. Compared with the prior art in which the shape of the struts in the arch expansion bracket is obtained by manual bending, the struts designed by 3D software can make their shapes better adapt to the oral shape, thereby improving the wearing comfort in the oral cavity. And compared with manually bending the connecting rod, the efficiency of the arch expansion bracket obtained by 3D software design and 3D printing is higher, which can reduce the difficulty and efficiency of the manufacturing operation of the fixed arch expansion appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a combination of a digital model of the arch expansion bracket, a digital spiral expander and a digital model of the oral cavity;

[0026] Figure 2 The invention is a combination of an arch expansion appliance without a temporary connecting rod, a spiral expander and an oral model. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The manufacturing method of the fixed arch expansion appliance in this embodiment includes:

[0029] 1) Perform a three-dimensional scan of the patient's oral cavity to obtain an oral digital model 1.

[0030] 2) Select a suitable real spiral expander according to the oral digital model, and design a digital spiral expander identical to the real spiral expander in 3D software. Figure 1 The spiral expander shown includes a screw 2, guide rods 3 located on both sides of the screw, and two connecting blocks 4 arranged on the screw 2 and the guide rods 3; when the screw 2 is rotated, the left and right connecting blocks 4 can move in opposite directions at the same time. Of course, in different embodiments, other forms of spiral expanders can also be selected according to actual needs.

[0031] 3) Combine the digital spiral expander and the oral digital model in the 3D software, and adjust the position of the digital spiral expander so that it is in a suitable position in the oral digital model. This step of adjusting the position of the digital spiral expander includes: adjusting the position of the middle seam 5 of the digital spiral expander to be parallel to the middle suture of the palate and located near the middle suture of the palate. In the specific implementation, it is preferred that the deviation between the position of the middle seam 5 of the digital spiral expander and the position of the middle suture of the palate is within the range of 0-1mm; adjusting the digital spiral expander to 0.3-0.8mm away from the palatal mucosa. When the spiral expander is not in contact with the palatal mucosa, the closer the spiral expander is to the palatal mucosa, the less impact it has on the tongue, and the better the wearing comfort.

[0032] By adjusting the position of the digital spiral expander in the 3D software, the digital spiral expander can be easily adjusted to the ideal position in the oral digital model. The adjustment operation is simple and convenient with high efficiency, which can improve the wearing comfort of the spiral expander in the oral cavity.

[0033] 4) A digital model of an expansion bracket connecting the molar and the digital spiral expander is designed in 3D software, wherein the digital model of the expansion bracket includes a left belt ring 6 that cooperates with the left molar on the oral digital model, a left support rod 7 connected to the left belt ring, a right belt ring 8 that cooperates with the right molar on the oral digital model, a right support rod 9 connected to the right belt ring, and a temporary connecting rod 10 that connects the left support rod and the right support rod.

[0034] 5) Perform 3D printing on the digital model of the arch expansion bracket to obtain an arch expansion bracket entity.

[0035] The shapes of the left and right struts of the arch expansion bracket in this embodiment are designed in the software and formed by 3D printing. Compared with the prior art in which the shape of the struts in the arch expansion bracket is obtained by manual bending, the struts designed by 3D software can make their shapes better adapt to the oral shape, thereby improving the wearing comfort in the oral cavity. And compared with manually bending the connecting rod, the efficiency of the arch expansion bracket obtained by 3D software design and 3D printing is higher, which can reduce the difficulty and efficiency of the manufacturing operation of the fixed arch expansion appliance.

[0036] 6) Assemble the arch expansion bracket entity to the real spiral expander, and weld the two together. The connection block 4 of the real spiral expander has a hemispherical groove that matches the ends of the left support rod 7 and the right support rod 9. During assembly, a certain force can be used to press the left support rod 7 and the right support rod 9 into the hemispherical groove to complete the assembly, and then weld the connection between the support rod and the hemispherical groove. Since the arch expansion bracket entity is connected to the left and right parts as a whole by a temporary connecting rod 10, when the arch expansion bracket entity is combined with the real spiral expander, the left support rod and the right support rod will not rotate around the center of the hemispherical groove, which can ensure that the positional relationship between the two can be kept consistent with the design state.

[0037] 7) Remove the temporary connecting rod on the arch expansion bracket to obtain a fixed arch expansion appliance.

[0038] 8) Grinding and polishing the fixed arch expansion appliance. Grinding and polishing can improve the wearing comfort of the fixed arch expansion appliance.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for manufacturing a fixed arch expansion appliance, characterized in that: include: 1) Perform a three-dimensional scan of the patient's oral cavity to obtain a digital model of the oral cavity; 2) Select a suitable real spiral expander according to the oral digital model, and design a digital spiral expander identical to the real spiral expander in 3D software; 3) combining the digital spiral expander and the oral digital model in the 3D software, and adjusting the position of the digital spiral expander so that it is in a suitable position in the oral digital model; 4) designing a digital model of an expansion bracket connecting the molar and the digital spiral expander in a 3D software, wherein the digital model of the expansion bracket includes a left band ring matched with the left molar on the oral digital model, a left support rod connected to the left band ring, a right band ring matched with the right molar on the oral digital model, a right support rod connected to the right band ring, and a temporary connecting rod connecting the left support rod and the right support rod; 5) 3D printing the digital model of the arch expansion stent to obtain an arch expansion stent entity; 6) physically combining the arch expansion stent with the real spiral expander and welding the two together; 7) Remove the temporary connecting rod on the arch expansion bracket to obtain a fixed arch expansion appliance.

2. The method for manufacturing a fixed arch expansion appliance according to claim 1, characterized in that: The step of adjusting the position of the digital spiral expander in step 3) includes: adjusting the middle suture position of the digital spiral expander to be parallel to and near the middle suture of the palate, and adjusting the digital spiral expander to be 0.3-0.8 mm away from the palatal mucosa.

3. The method for manufacturing a fixed arch expansion appliance according to claim 1, characterized in that: The method further comprises step 8): grinding and polishing the fixed arch expansion appliance obtained in step 7).

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