A personalized maxillomandibular combined traction device for skeletal class II high-angle retruded mandible patients

Abstract

This invention discloses a personalized maxillary and mandibular combined traction device for patients with skeletal Class II high-angle mandibular retrusion, belonging to the field of orthodontics. The device includes personalized maxillary / mandibular titanium plates, elastic traction components, and brackets. Two elastic traction components are included, one for intruding the maxillary molars and the other for tractioning the mandible forward. The maxillary and mandibular titanium plates are positioned at the center of jawbone resistance and are both 3D-printed integrated personalized designs. The elasticity of the traction components can be selected according to needs. This device simultaneously achieves mandibular advancement and maxillary molar intrusion, efficiently enabling early correction of skeletal Class II high-angle mandibular retrusion patients. It also avoids labial tipping of the lower anterior teeth and mesial tilting of the lower posterior teeth. The titanium plates conform to the jawbone, resulting in minimal intraoperative trauma, precise force control, and significantly improved treatment effectiveness and efficiency.

Description

Technical Field

[0001] This invention relates to the field of orthodontic technology, specifically to a personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion. Background Technology

[0002] Class II skeletal malocclusion is mainly characterized by mandibular retrusion. In my country, the proportion of patients with high-angle Class II malocclusion is relatively high, severely affecting facial aesthetics and oral function. Currently, functional appliances are not very effective in treating high-angle Class II skeletal malocclusion. Traditional clinical treatment often relies on functional appliances or dental traction devices, but these suffer from problems such as unstable retention, dependence on patient cooperation, inconsistent efficacy, and the potential for compensatory labial tipping of the lower anterior teeth and mesial tilting of the lower posterior teeth. Therefore, there is an urgent need for a novel device specifically designed to treat high-angle mandibular retrusion in Class II skeletal malocclusion. This device should be able to guide the mandible forward through skeletal anchorage while simultaneously aligning the teeth, be comfortable to wear, and allow for precise control of the magnitude and direction of traction force.

[0003] Furthermore, individual differences exist in jawbone morphology among patients, and conventional titanium plate manufacturing processes (such as CNC machining and metal casting) suffer from low precision and insufficient personalization, failing to achieve accurate fit. By employing digital modeling and 3D printing technology, personalized design and precise manufacturing can be carried out based on the patient's CT and intraoral scan data, achieving a perfect fit between the titanium plate and the bone surface. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides a personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion. The device uses maxillary skeletal anchorage to pull the mandible forward, while simultaneously intruding the maxillary molars and avoiding mandibular dental compensatory tilting. It can also be used in conjunction with fixed orthodontic appliances for tooth alignment and occlusal adjustment, thereby improving the orthodontic effect and efficiency.

[0005] The technical solution adopted in this invention is as follows: A personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion includes a personalized maxillary titanium plate, a personalized mandibular titanium plate, an elastic traction element, and a bracket. The elastic traction component includes a first elastic traction component and a second elastic traction component; The bracket is cemented to the buccal surface of the maxillary molar that needs to be indented; The personalized maxillary titanium plate includes a maxillary titanium plate body, several maxillary screw holes, traction protrusions and traction hooks. The maxillary screw holes are opened through the maxillary titanium plate body, the traction protrusions are provided on the maxillary titanium plate body, and the traction hooks are located at the ends of the maxillary titanium plate body. The personalized mandibular titanium plate includes a mandibular titanium plate body, several mandibular screw holes, and a traction connection structure. The mandibular screw holes are formed through the mandibular titanium plate body; the traction connection structure is fixed to the mandibular titanium plate body. The two ends of the first elastic traction member are elastically connected to the traction protrusion and the bracket, respectively, for depressing the maxillary molar; The two ends of the second elastic traction member are elastically connected to the traction hook and the traction connection structure, respectively, and are used to apply a forward traction force to the personalized titanium plate of the mandible to guide the mandible to adjust forward.

[0006] Furthermore, the maxillary titanium plate body and the mandibular titanium plate body are positioned at the impedance centers of the maxilla and mandible, respectively. The maxillary titanium plate body is used to provide bony anchorage for traction of the mandible forward and depressing of the maxillary molars; the mandibular titanium plate body is used as the traction force receiving end.

[0007] Furthermore, the maxillary titanium plate body is fixedly connected to the maxilla by screws passing through the maxillary screw holes, and the mandibular titanium plate body is fixedly connected to the mandibular bone by screws passing through the mandibular screw holes, in order to ensure the stability of the titanium plate and avoid displacement during traction.

[0008] Furthermore, both the maxillary and mandibular personalized titanium plates are designed using 3D printing technology for integrated personalization.

[0009] Furthermore, the elastic forces of the first elastic traction member (301) and the second elastic traction member (302) can be selected as needed to control the magnitude and direction of the traction force.

[0010] Furthermore, there are two maxillary screw holes and three mandibular screw holes.

[0011] The present invention has the following beneficial effects: This invention is a personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion. Through stable and slow traction force, it induces the formation of new bone, while simultaneously causing adaptive expansion of surrounding soft tissues (muscles, blood vessels, nerves), thus solving the problem of skeletal Class II high-angle mandibular retrusion.

[0012] This invention provides a personalized mandibular traction device that utilizes the body's own osteogenic capacity, eliminating the need for implanting a large amount of artificial materials. The titanium plate in this invention is 3D printed and customized to fit the shape of the jawbone, making it small and lightweight, minimizing intraoperative trauma, and improving surgical and orthodontic efficiency. Through personalized design and digital technology, precise treatment is achieved.

[0013] In this invention, the traction protrusion, traction hook and connecting structure can precisely adjust the direction and magnitude of the traction force, and can simultaneously achieve mandibular advancement and maxillary molar intrusion, effectively achieving early correction for patients with skeletal Class II high-angle mandibular retrusion, and can avoid dental effects such as labial inclination of the lower anterior teeth and mesial inclination of the lower posterior teeth. Attached Figure Description

[0014] Figure 1 This invention relates to a personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion; Figure 2 The present invention relates to a personalized titanium plate for the maxilla in patients with skeletal Class II high-angle mandibular retrusion. Figure 3 The present invention relates to a personalized titanium plate for the mandible of patients with skeletal Class II high-angle mandibular retrusion.

[0015] In the figure, 101 is the main body of the maxillary titanium plate; 102 is the maxillary screw hole; 103 is the traction protrusion; 104 is the traction hook; 201 is the main body of the mandibular titanium plate; 202 is the mandibular screw hole; 203 is the traction connection structure; 301 is the first elastic traction component; 302 is the second elastic traction component; and 401 is the bracket. Detailed Implementation

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0017] The design of personalized titanium plates for the upper and lower jaws includes the following steps: The first step is to obtain three-dimensional structural data of the patient's oral surface through an intraoral scanner, and to obtain three-dimensional data of the patient's jawbone and teeth through cone-beam computed tomography (CBCT). The second step is to import the three-dimensional structural data of the patient's oral surface obtained by the intraoral scanner and the three-dimensional data of the patient's jawbone and teeth obtained by cone-beam CT into the three-dimensional modeling software (Mimics) for data overlay and to reconstruct the three-dimensional model of the patient's jawbone and teeth. The third step is to design the traction device in CAD modeling software based on the patient's surface 3D structural features and the 3D anatomical features of the jawbone and teeth. According to the patient's jawbone 3D model, the position and length / width boundaries of the titanium plates in the traction device are confirmed. The thickness of both the maxillary titanium plate body 101 and the mandibular titanium plate body 201 is 2 mm, thus completing the 3D design of the titanium plates. Using the 3D model of the teeth, the position of the fixing screws in the traction device is confirmed. The screw hole design must avoid the tooth root and related soft tissues. Two maxillary screw holes 102 are designed for the personalized maxillary titanium plate, and three mandibular screw holes 202 are designed for the personalized mandibular titanium plate. The screw hole diameter is 2 mm, thus generating screw holes of corresponding size and direction. Based on the patient's oral cavity surface 3D model and the patient's jawbone model, the thickness of the labial mucosa is confirmed, and the length of the straight portion of the traction hook 104, the height of the traction protrusion 103, and the height of the traction connection structure 203 are designed, thus completing the 3D design of the traction hook 104. The maxillary titanium plate body 101, traction hook 104, and traction protrusion 103 are assembled into a whole, and the mandibular titanium plate body 201 and traction connection structure 203 are assembled into a whole, generating the final three-dimensional design file of the personalized maxillary and mandibular combined traction device. The fourth step is to import the 3D design file of the traction device completed above into CAM software and use 3D printing equipment to manufacture it.

[0018] The present invention provides a personalized combined maxillary and mandibular traction device for patients with skeletal Class II high-angle mandibular retrusion, comprising a personalized maxillary titanium plate, a personalized mandibular titanium plate, an elastic traction element, and a bracket 401; The elastic traction member includes a first elastic traction member 301 and a second elastic traction member 302; The bracket 401 is cemented to the buccal surface of the maxillary molar that needs to be indented; The personalized maxillary titanium plate includes a maxillary titanium plate body 101, a plurality of maxillary screw holes 102, traction protrusions 103 and traction hooks 104. The maxillary screw holes 102 are opened through the maxillary titanium plate body 101, the traction protrusions 103 are provided on the maxillary titanium plate body 101, and the traction hooks 104 are located at the end of the maxillary titanium plate body 101. The personalized mandibular titanium plate includes a mandibular titanium plate body 201, a plurality of mandibular screw holes 202 and a traction connection structure 203. The mandibular screw holes 202 are formed through the mandibular titanium plate body 201; the traction connection structure 203 is fixed to the mandibular titanium plate body 201. The two ends of the first elastic traction member 301 are elastically connected to the traction protrusion 103 and the bracket 401 respectively, and are used to depress the maxillary molars; The two ends of the second elastic traction member 302 are elastically connected to the traction hook 104 and the traction connection structure 203 respectively, and are used to apply a forward traction force to the personalized titanium plate of the mandible to guide the mandible to adjust forward.

[0019] In one specific embodiment of the present invention, the positioning positions of the maxillary titanium plate body 101 and the mandibular titanium plate body 201 are determined by the doctor. The personalized maxillary titanium plate is fixed to the maxilla above the molar region to provide bony anchorage; the personalized mandibular titanium plate is fixed to the lateral surface of the mandible to serve as the traction force receiving end.

[0020] As a specific embodiment of the present invention, the personalized titanium plates for the upper and lower jaws are made of Ti-6Al-4V alloy material and are manufactured in one step using 3D printing equipment.

[0021] As a specific embodiment of the present invention, the first elastic traction member 301 and the second elastic traction member 302 can select different elastic attachments according to the patient's treatment progress in order to control the magnitude and direction of the traction force.

[0022] The device can be used in conjunction with fixed orthodontic appliances to guide the mandible forward while aligning teeth and adjusting occlusion.

[0023] In summary, the personalized maxillary and mandibular combined traction device of this invention, through personalized design and 3D printing technology, achieves good fit between the personalized titanium plates of the maxilla and mandible and the patient's bone structure, with minimal intraoperative damage, shortening the operation time and improving the efficiency of the surgery; the maxillary bony anchorage is used to pull the mandible forward, avoiding dental effects; and teeth can be aligned simultaneously for fixed orthodontics.

[0024] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A personalized maxillomandibular co- traction device for a skeletal class II high angle mandibular set back patient, characterized in that, The application relates to a maxillary personalized titanium plate, a mandibular personalized titanium plate, an elastic traction member and a bracket. The elastic traction member comprises a first elastic traction member and a second elastic traction member; the bracket is fixed on the buccal surface of a maxillary molar needing to be depressed; the maxillary personalized titanium plate comprises a maxillary titanium plate body, a plurality of maxillary screw holes, a traction protrusion and a traction hook, the maxillary screw holes are arranged on the maxillary titanium plate body, the traction protrusion is arranged on the maxillary titanium plate body, and the traction hook is arranged at the end of the maxillary titanium plate body. The mandibular personalized titanium plate comprises a mandibular titanium plate body, a plurality of mandibular screw holes and a traction connecting structure; the mandibular screw holes are arranged on the mandibular titanium plate body; and the traction connecting structure is fixed on the mandibular titanium plate body. The two ends of the first elastic traction member are elastically connected with the traction protrusion and the bracket respectively, and the first elastic traction member is used for depressing the maxillary molar. The two ends of the second elastic traction member are elastically connected with the traction hook and the traction connecting structure respectively, and the second elastic traction member is used for applying a forward traction force to the mandibular personalized titanium plate to guide the mandible to adjust forward.

2. A personalized maxillomandibular elavation appliance for skeletal class II high angle retrognathic patients according to claim 1, characterized in that, The positioning positions of the maxillary titanium plate body and the mandibular titanium plate body are located at the impedance centers of the upper and lower jaws respectively, the maxillary titanium plate body is used for providing a bone anchorage for traction of the mandible forward and depression of the maxillary molar, and the mandibular titanium plate body is used as a traction stress receiving end.

3. A personalized maxillomandibular elavation appliance for skeletal class II high angle retruded patients according to claim 1, wherein, The maxillary titanium plate body is fixedly connected with the maxillary bone through the maxillary screw holes by means of screws, the mandibular titanium plate body is fixedly connected with the mandibular bone through the mandibular screw holes by means of screws, and the stability of the titanium plate is ensured to avoid displacement during traction.

4. A personalized combined maxillo-mandibular elastics device for skeletal class II high angle retrognathic patients according to claim 1, characterized in that, The maxillary personalized titanium plate and the mandibular personalized titanium plate are integrally and individually designed by using 3D printing technology.

5. A personalized combined maxillo-mandibular elastics device for skeletal class II high angle retrognathic patients according to claim 1, characterized in that, The elastic forces of the first elastic traction member and the second elastic traction member are selected according to needs to control the size and direction of the traction force.

6. A personalized combined maxillo-mandibular advancement device for skeletal class II high angle retrognathic patients according to claim 1, characterized in that, The plurality of maxillary screw holes are two, and the plurality of mandibular screw holes are three.

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