3D-printed orthodontic auxiliary retention device and method for manufacturing the same

Abstract

The application discloses a novel 3D printing active orthodontic auxiliary retention device and a manufacturing and bonding method thereof, relates to the technical field of tooth correction, and solves the problem that it is difficult to obtain a better retention force due to the absence of a retention undercut or the insufficient retention undercut on the surface of a tooth. The auxiliary retention device is in a plate shape, and the thickness is 0.5-0.7 mm. The surface form of the auxiliary retention device is consistent with the tooth shape. The inner side of the auxiliary retention device is bonded to the surface of the tooth, and a reverse concave area is formed at the tooth neck. The auxiliary retention device forms a reverse concave area at the tooth neck, the arm of the single-arm clasp is located in the reverse concave area, the correction force transmission is stable, the tooth position can be more accurately pulled and moved, the problems that the single-arm clasp has no retention force or has poor retention force due to the absence of a retention undercut or the insufficient retention undercut on the surface of a tooth crown, the arrow clasp or the interproximal hook easily compresses the gum papilla, causes gum absorption and patient discomfort, pain and other problems can be effectively solved, and the retention effect can be better provided.

Description

Technical Field

[0001] This invention relates to the field of orthodontic technology, and more specifically to the field of removable orthodontic auxiliary retention devices and their manufacturing technology. Background Technology

[0002] Orthodontics is the process of correcting teeth, correcting malocclusions and deformities. Orthodontics primarily studies the etiology and mechanisms of malocclusions and deformities, diagnoses and analyzes them, and provides prevention and treatment, ultimately achieving the goal of improving the appearance of teeth.

[0003] There are generally two types of orthodontic appliances: fixed appliances and removable appliances. Fixed appliances use brackets, bands, archwires, and other accessories to guide tooth movement and achieve orthodontic goals. Removable appliances mainly consist of three parts: force application, connection devices, and retention devices. The force application part includes labial arches, springs, rubber bands, and screws; the connection part is mainly a resin base; and the retention devices include arrow clasps, single-arm clasps, and interproximal hooks. Removable appliances are attached to the teeth and mucosa, applying external force by contacting the tooth surface to move the teeth. Patients can remove and wear them themselves.

[0004] Removable orthodontic appliances are a commonly used type of orthodontic appliance, and they only function effectively if they have good retention. Currently, single-arm clasps are commonly used for retention in removable appliances, but several problems are frequently encountered in clinical application. Generally, most primary dentition teeth have short, conical crowns with no undercuts. Furthermore, some permanent dentition teeth have insufficient undercuts, making it difficult for single-arm clasps to achieve adequate retention on teeth with no or insufficient undercuts, thus failing to effectively transmit corrective forces. While using interproximal hooks or arrow clasps can achieve better retention in these cases, they can easily compress the gingival papilla, causing gingival bleeding, patient discomfort, and pain, making it impossible for the patient to wear the appliance, prolonging treatment time, or even leading to treatment failure. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem of difficulty in obtaining good retention force due to the lack of retention undercuts or insufficient retention undercuts on the tooth surface. This invention provides a novel 3D-printed removable orthodontic auxiliary retention device and its manufacturing and bonding method.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: a novel 3D-printed removable orthodontic auxiliary retention device, wherein the auxiliary retention device is plate-shaped with a thickness of 0.5-0.7 mm, the surface morphology of the auxiliary retention device is consistent with the tooth shape, and the inner side (bonding surface) of the auxiliary retention device is bonded to the tooth surface, thereby forming an undercut area at the neck of the tooth.

[0007] In the technical solution of this application: the auxiliary retention device is plate-shaped with a thickness of about 0.5-0.7 mm. The inner surface of the auxiliary retention device, i.e. the bonding surface, is in contact with the tooth surface. The cross-sectional shape of the auxiliary retention device is similar to a semi-oval shape, and its surface shape is consistent with the tooth shape. The auxiliary retention device creates an undercut area at the neck of the tooth. The arm of the single-arm clasp is located in the undercut area. The arm of the single-arm clasp is located in the undercut area, which can obtain sufficient retention force to pull and move the tooth position. The inner surface (bonding surface) of the auxiliary retention device in this application contacts the tooth surface. The cross-sectional shape of the auxiliary retention device is similar to a semi-oval shape, and its surface morphology is consistent with the tooth shape. The auxiliary retention device creates an undercut at the neck of the tooth, and the arm of the single-arm clasp is located within the undercut. This ensures stable transmission of orthodontic force and more precise traction and movement of the tooth. It effectively solves the problems of single-arm clasps lacking retention undercuts or having insufficient retention undercuts on the crown surface, resulting in poor retention, and arrow clasps or interproximal hooks easily compressing the gingival papilla, causing gingival bleeding, patient discomfort, and pain. It provides better retention. In addition, the removable orthodontic auxiliary retention device of this application has stable performance, reduces the frequency of clinical adjustments and patient follow-up visits, facilitates clinical use, and makes patients comfortable and doctors efficient.

[0008] Furthermore, the cross-section of the auxiliary retaining device along its length is semi-oval.

[0009] Furthermore, the auxiliary fixation device is made of medical resin.

[0010] Furthermore, the thickness of the auxiliary fixation device is 0.6 mm.

[0011] The method for fabricating and bonding the novel 3D-printed movable orthodontic auxiliary retention device includes the following steps: Step 1: Fabrication of the auxiliary fixation device; Step 1.1: Obtain 3D tooth model data; Step 1.2: Use CAD (Computer-Aided Design) software to design and create 3D data for the auxiliary fixation device; Step 1.3: Use CAM (Computer-Aided Manufacturing System) to arrange the 3D data of the auxiliary fixation device and generate CAM printing data to complete the 3D printing into a solid object; Step 1.4: After grinding and polishing, the auxiliary retention device is obtained; Step 2: Fabrication of the intraoral bonding guide plate; Step 2.1: Fuse the 3D auxiliary retention device data with the 3D tooth model data to form 3D model data for fabricating the guide plate of the intraoral adhesive auxiliary retention device; Step 2.2: Use CAD (Computer-Aided Design) software to design and create the 3D data of the guide plate; Step 2.3: Use CAM (Computer-Aided Manufacturing System) to arrange the 3D data of the guide plate and generate CAM printing data to complete the 3D printing into a solid object; Step 2.4: After grinding and polishing, the guide plate is obtained; Step 3: Reset the auxiliary fixing device from step 1.4 into the guide plate obtained in step 2.4, and wait for the inside of the opening to bond.

[0012] Furthermore, in step 1.4, the grinding process should be meticulous, progressing from coarse to fine grinding, with appropriate force applied to avoid changes in values ​​and deformation. During polishing, except for the bonding surface of the orthodontic auxiliary retention device, all other surfaces should be highly polished with resin polishing paste.

[0013] Furthermore, in step 2.4, the grinding process should be meticulous, progressing from coarse to fine grinding with appropriate force to avoid changes in values ​​and deformation. During polishing, except for the contact surface between the guide plate and the teeth inside the mouth, all other surfaces should be highly polished with resin polishing paste.

[0014] Furthermore, the intraoral adhesive guide is made of highly transparent resin.

[0015] Furthermore, the intraoral bonding is achieved through a light-curing method.

[0016] Furthermore, in step 1.1, the patient's natural teeth and mucosal tissues in the oral cavity are examined, abutment teeth are selected, and then 3D tooth model data is collected.

[0017] Furthermore, in step 1.1, a plaster model of the teeth is collected, and a 3D scanner is used to scan the plaster model of the teeth to generate 3D tooth model data.

[0018] The beneficial effects of this invention are as follows: 1. The inner surface of the auxiliary retention device of this application, i.e. the bonding surface, is in contact with the tooth surface. The cross-sectional shape of the auxiliary retention device is similar to a semi-oval shape, and its surface shape is consistent with the tooth shape. The auxiliary retention device creates an undercut area at the neck of the tooth. The arm of the single-arm clasp is located in the undercut area, which ensures stable transmission of orthodontic force and more precise traction and movement of the tooth position. It can effectively solve the problems of single-arm clasps having no retention undercut or insufficient retention undercut on the crown surface, resulting in no retention force or poor retention force, and arrow clasps or interproximal hooks easily compressing the gingival papilla, causing gingival resorption and patient discomfort and pain. It can provide better retention. 2. The active orthodontic auxiliary retention device of this application has stable performance, reduces the frequency of clinical adjustments and patient follow-up visits, facilitates clinical use, makes patients comfortable and doctors efficient; 3. Obtain 3D tooth model data, use CAD to design and fabricate 3D auxiliary retention device data, and integrate the 3D auxiliary retention device data with the 3D tooth model data to form 3D model data for fabricating the intraoral bonding guide plate for the auxiliary retention device. Use CAD to fabricate the intraoral bonding guide plate, which is approximately 1-1.5mm thick. The fabricated auxiliary retention device is then repositioned inside the guide plate for intraoral bonding, allowing for more precise bonding of the auxiliary retention device to the designed position on the tooth and facilitating the doctor's operation. 4. The purpose of the intraoral adhesive guide is to accurately position the auxiliary retention device and bond it through light curing. The material of the intraoral adhesive guide is a highly transparent resin, so as not to affect the light curing bonding effect. 5. By setting up auxiliary retention devices and their corresponding intraoral bonding guides, orthodontic auxiliary retention devices can be precisely bonded to the designed positions on the teeth. At the same time, multiple orthodontic auxiliary retention devices can be bonded to the corresponding teeth. The clinical operation is simple and efficient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the molding structure of the novel 3D-printed active orthodontic auxiliary fixation device of the present invention; Figure 2 This is a schematic diagram of the structure of the auxiliary retention device of the present invention located on the tooth; Figure 3 This is a schematic diagram of the auxiliary fixation device of the present invention; Figure 4 This is a schematic diagram of the structure of the auxiliary retention device of the present invention forming an undercut area with the tooth; Figure 5 This is a schematic diagram of the structure of the present invention, which has a single-arm retaining ring in the recessed area; Figure 6 This is a 3D data model of the guide plate of the present invention and a structural schematic diagram of the intraoral bonding guide plate; Figure 7 This is a schematic diagram of the auxiliary retention device of the present invention located inside the intraoral adhesive guide plate; Figure 8 This is a schematic diagram of the structure of the 3D data model of the tooth and the auxiliary retention device of the present invention located in the intraoral adhesive guide.

[0020] Reference numerals: 1-teeth, 2-auxiliary retention device, 3-single-arm clasp, 4-adhesive surface, 5-undercut area, 6-intraoral adhesive guide, 7-3D data model of the guide, 8-3D data model of the teeth. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0022] Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Example 1

[0023] like Figures 1 to 5 As shown, this embodiment provides a novel 3D-printed removable orthodontic auxiliary retention device. The auxiliary retention device 2 is plate-shaped with a thickness of 0.6 mm. The surface morphology of the auxiliary retention device 2 is consistent with the shape of the tooth. The inner surface (bonding surface 4) of the auxiliary retention device 2 is bonded to the surface of the tooth 1, forming an undercut area 5 at the neck of the tooth 1. The cross-section of the auxiliary retention device 2 along its length is semi-oval. The material of the auxiliary retention device 2 is medical resin.

[0024] In this embodiment: the auxiliary retention device 2 of this application is plate-shaped and about 0.6 mm thick. The inner surface of the auxiliary retention device 2, i.e. the bonding surface 4, is in contact with the surface of the tooth 1. The cross-sectional shape of the auxiliary retention device 2 is similar to a semi-oval shape, and its surface shape is consistent with the shape of the tooth. The auxiliary retention device 2 forms a recessed area 5 at the neck of the tooth 1. The arm of the single-arm clasp 3 is located in the recessed area 5, which can obtain sufficient retention force to pull and move the position of the tooth 1. The inner surface (bonding surface 4) of the auxiliary retention device 2 in this application contacts the surface of the tooth 1. The cross-sectional shape of the auxiliary retention device 2 is similar to a semi-oval shape, and its surface morphology is consistent with the tooth's shape. The auxiliary retention device 2 creates an undercut area 5 at the neck of the tooth 1. The arm of the single-arm clasp 3 is located within the undercut area 5, ensuring stable transmission of orthodontic force and more precise traction and movement of the tooth 1. This effectively solves the problems of single-arm clasps 3 causing no retention or poor retention due to the absence or insufficiency of retention undercuts on the crown surface, and the problems of arrow clasps or interproximal hooks easily compressing the gingival papilla, causing gingival bleeding, patient discomfort, and pain. It provides better retention. In addition, the removable orthodontic auxiliary retention device 2 of this application has stable performance, reduces the frequency of clinical adjustments and patient follow-up visits, facilitates clinical use, and makes patients comfortable and doctors efficient.

[0025] The auxiliary positioning device 2 of this application is plate-shaped and about 0.5 mm or 0.7 mm thick, or it can be other point values ​​within the range of 0.5-0.7 mm. Example 2

[0026] like Figures 1 to 5 As shown, this embodiment provides the fabrication of an auxiliary retention device, including the following steps: Step 1.1: Examine the patient's natural teeth and oral mucosa, select abutment teeth appropriately according to the design requirements, and then collect 3D tooth model data; Step 1.2: Use CAD (Computer-Aided Design Software) to design and create 3D data of the orthodontic auxiliary retention device 2. When designing, various design principles should be followed, and attention should be paid to the setting position, size, thickness and shape of the orthodontic auxiliary retention device 2 to avoid losing its due function. Step 1.3: Use CAM (Computer-Aided Manufacturing System) to arrange the 3D data of the auxiliary fixing device 2 and generate CAM printing data. Pay attention to the design of the support rod to avoid 3D printing failure or defects, and complete the 3D printing into a solid. Step 1.4: After grinding and polishing, the auxiliary retention device 2 is obtained. Grinding should be done carefully, from coarse to fine grinding, with appropriate force to avoid changes in values ​​and deformation. During polishing, except for the bonding surface 4 of the orthodontic auxiliary retention device 2, all other surfaces are highly polished with resin polishing paste.

[0027] In this embodiment, the materials and equipment used are: printing resin, CAD / CAM equipment, grinding machine, grinding stones, and resin polishing paste. Example 3

[0028] In step 1.1, a plaster model of the teeth is collected, and a 3D scanner is used to scan the plaster model of the teeth to generate 3D tooth model data. The remaining steps are the same as in Example 2. Example 4

[0029] like Figures 6 to 8 As shown, this embodiment provides the fabrication of an intraoral adhesive guide, including the following steps: Step 2.1: Merge the 3D auxiliary retention device 2 model data with the 3D tooth 1 model data to form 3D model data for fabricating the guide plate of the intraoral adhesive auxiliary retention device 2; Step 2.2: Use CAD (Computer-Aided Design Software) to design and manufacture the 3D data of the guide plate. When designing, various design principles should be followed. Pay attention to the setting position, shape, size and thickness of the guide plate 6 inside the mouth to avoid losing its proper function. Step 2.3: Use CAM (Computer-Aided Manufacturing System) to lay out the 3D data of the guide plate and generate CAM printing data. Pay attention to the design of the support rod to avoid laser printing failure or defects, and complete the 3D printing into a solid. Step 2.4: After grinding and polishing, the guide plate is obtained. Grinding should be done carefully, from coarse to fine grinding, with appropriate force to avoid changes in values ​​and deformation. During polishing, except for the contact surface between the guide plate 6 and the tooth 1 inside the mouth, all other surfaces are highly polished with resin polishing paste.

[0030] In this embodiment, the materials and equipment used are: printing resin, CAD / CAM equipment, grinding machine, grinding stones, and resin polishing paste. Example 5

[0031] Based on Examples 2 and 3, such as Figures 1 to 8 As shown, the bonding method of the novel 3D printed active orthodontic auxiliary fixation device involves resetting the auxiliary fixation device 2 from step 1.4 into the guide plate obtained in step 2.4, and bonding it inside the mouth. The material of the guide plate 6 for bonding inside the mouth is high-transparency resin, and the bonding inside the mouth is done by light curing.

[0032] Figure 6 In the image, 7 represents the 3D data model of the guide plate. Figure 8 8 is a 3D data model of a tooth.

Claims

1. A 3D-printed movable orthodontic auxiliary retention device, characterized in that, The auxiliary retention device is plate-shaped with a thickness of 0.5-0.7 mm. The surface morphology of the auxiliary retention device is consistent with the tooth shape. The inner side of the auxiliary retention device is bonded to the tooth surface and forms an undercut at the neck of the tooth. It also includes a single-arm clasp, the arm of which is located in the undercut. The cross-section of the auxiliary retention device along its length is semi-oval.

2. The 3D-printed active orthodontic auxiliary fixation device according to claim 1, characterized in that, The auxiliary fixation device is made of medical resin.

3. The 3D-printed active orthodontic auxiliary fixation device according to claim 1, characterized in that, The thickness of the auxiliary fixation device is 0.6 mm.

4. The method for manufacturing a 3D-printed active orthodontic auxiliary fixation device as described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Fabrication of the auxiliary fixation device; Step 1.1: Obtain 3D tooth model data; Step 1.2: Use CAD to design and create 3D data for the auxiliary fixation device; Step 1.3: Use CAM to arrange the 3D data of the auxiliary fixation device and generate CAM printing data to complete the 3D printing into a solid object; Step 1.4: After grinding and polishing, the auxiliary retention device is obtained; Step 2: Fabrication of the intraoral bonding guide plate; Step 2.1: Fuse the 3D auxiliary retention device data with the 3D tooth model data to form 3D model data for fabricating the guide plate of the intraoral adhesive auxiliary retention device; Step 2.2: Use CAD to design and create 3D data for the guide plate; Step 2.3: Use CAM to arrange the 3D data of the guide plate and generate CAM printing data to complete the 3D printing into a solid object; Step 2.4: After grinding and polishing, the guide plate is obtained; Step 3: Reset the auxiliary fixing device from step 1.4 into the guide plate obtained in step 2.4, and wait for the inside of the opening to bond.

5. The method for manufacturing the 3D-printed active orthodontic auxiliary fixation device according to claim 4, characterized in that, In step 1.4, the grinding process should proceed from coarse to fine to avoid changes in values ​​and deformation. During polishing, all surfaces except the bonding surface of the orthodontic auxiliary retention device should be polished with resin polishing paste.

6. The method for manufacturing the 3D-printed active orthodontic auxiliary fixation device according to claim 4, characterized in that, In step 2.4, the grinding process should proceed from coarse to fine to avoid changes in the values ​​and deformation. During polishing, except for the contact surface between the guide plate and the teeth inside the mouth, all other surfaces should be polished with resin polishing paste.

7. The method for manufacturing the 3D-printed active orthodontic auxiliary fixation device according to claim 4, characterized in that, The intraoral bonding guide is made of highly transparent resin; the intraoral bonding is done by light curing.

8. The method for manufacturing the 3D-printed active orthodontic auxiliary fixation device according to claim 4, characterized in that, In step 1.1, examine the patient's natural teeth and mucosal tissue in the oral cavity, select abutment teeth, and then collect 3D tooth model data.

9. The method for manufacturing the 3D-printed active orthodontic auxiliary fixation device according to claim 4, characterized in that, In step 1.1, a plaster model of the teeth is collected, and a 3D scanner is used to scan the plaster model of the teeth to generate 3D tooth model data.

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