Orthodontic postoperative intermaxillary traction device based on invisible orthodontic device

Abstract

The utility model relates to an orthognathic postoperative intermaxillary traction device based on an invisible orthodontic device, an upper jaw traction device and a lower jaw traction device are split, and the upper jaw traction device and the lower jaw traction device are embedded through an occlusal surface. Reinforcing structures are respectively arranged on the upper jaw traction device and the lower jaw traction device, an upper jaw occlusal position is arranged on the upper jaw contact surface, an upper jaw traction hook is arranged on the lip-cheek side of the upper jaw contact surface, three observation windows are arranged on the upper jaw traction device, a lower jaw occlusal position is arranged on the lower jaw contact surface, and a lower jaw traction hook is arranged on the lip-cheek side of the lower jaw contact surface. A rubber ring is hung and fixed between the upper jaw traction hook and the lower jaw traction hook, intermaxillary elastic traction is carried out on the upper jaw and the lower jaw, the intermaxillary elastic traction device can be used for carrying out intermaxillary elastic traction after an invisible orthodontic patient finishes the orthodontic operation without assistance of methods such as a dental arch splint and an intermaxillary traction nail, and it is ensured that the occlusion relation after the orthodontic operation meets the requirement.

Description

Technical Field

[0001] The utility model relates to an inter-jaw traction device after orthognathic surgery based on an invisible orthodontic device. Background Art

[0002] Severe dentofacial deformities often lead to malocclusion, disordered occlusion, masticatory dysfunction, and unsightly facial shape. It is difficult to achieve ideal treatment results for such deformities through orthodontic means alone, and often requires combined orthodontic and orthognathic treatment. Preoperative orthodontic treatment removes tooth compensation, orthognathic surgery moves the jaw bone to correct jaw deformity, and postoperative orthodontic treatment finely adjusts the occlusion. Traditional fixed appliances are increasingly unable to meet the needs of patients due to their shortcomings such as lack of beauty, poor comfort, and difficulty in maintaining oral hygiene.

[0003] Bracketless invisible orthodontic technology, also often referred to as invisible correction technology, is a method of correcting tooth alignment using transparent, removable plastic appliances. Compared with traditional metal brackets or ceramic brackets, bracketless invisible orthodontic appliances have the advantages of being beautiful, comfortable, easy to maintain oral hygiene, and predictable efficacy. At the same time, bracketless invisible orthodontic appliances are customized based on the three-dimensional scanning data of the patient's mouth, and can gradually guide the teeth to move to the desired position. During the entire digital treatment process, orthodontists can have a more comprehensive grasp of the movement of teeth, and patients can also have a certain understanding and knowledge of the entire treatment process through simulated animations. Therefore, more and more patients undergoing orthodontic and orthognathic combined treatment require the use of bracketless invisible orthodontics. Correspondingly, the application of bracketless invisible orthodontics in orthodontic and orthognathic combined treatment is becoming more and more extensive.

[0004] Although bracketless invisible technology has brought a technological revolution to preoperative orthodontic treatment, this change has also brought some clinical problems to maxillofacial surgeons: For patients who use traditional fixed orthodontics, finished traction hooks are usually inserted between the brackets on the orthodontic archwire of the fixed appliance as auxiliary devices for traction. After the operation, the terminal occlusal guide for orthognathic surgery is ligated to the maxillary dentition, and the mandibular dentition is pulled into the terminal occlusal guide with the help of a rubber ring hung on the traction hook to perform intermaxillary elastic traction to ensure that the postoperative occlusal relationship meets the preoperative design. Patients with bracketless invisible orthodontics do not have fixed orthodontic devices in their mouths to assist. How to perform intermaxillary traction after the operation? The commonly used clinical method is to use dental arch splints or intermaxillary traction pins for postoperative intermaxillary elastic traction to ensure that the postoperative occlusal relationship meets the design, but both methods currently have certain shortcomings.

[0005] Dental arch splint: The dental arch splint is ligated to the dentition with stainless steel wire. During the operation, a stainless steel wire loop is used to ligate between the traction hooks of the dental arch splint to complete the intermaxillary fixation, and then the maxillary and mandibular dental bone segments are fixed at the target position. After the operation, the terminal occlusal guide is ligated to the maxillary dental arch splint, and a rubber ring is hung between the traction hooks of the dental arch splint to perform intermaxillary traction. The disadvantage is that the dental arch splint needs to be fixed with stainless steel wire on each tooth of the entire dentition, which causes great damage to the periodontal tissue, takes a long time during the operation, and the doctor is at risk of needle stick injury. It is also not conducive to the patient's oral hygiene maintenance after the operation, and it is easy to cause adverse consequences such as gingival swelling and necrosis.

[0006] Intermaxillary traction pins: This method is to implant a total of 8-10 titanium self-tapping intermaxillary traction pins in the maxillary and mandibular bones. The implantation site is usually between the lateral incisors and canines and between the first premolars or between the second premolars and first molars in each area. During the operation, a stainless steel wire loop is used to ligate between the maxillary and mandibular traction pins for intermaxillary fixation, thereby fixing the maxillary and mandibular bone segments at the target position. After the operation, the terminal occlusal guide is ligated to the maxillary traction pin, and then an elastic rubber band is used between the maxillary and mandibular traction pins for intermaxillary elastic traction. Compared with dental arch splints, this method can effectively improve oral hygiene and shorten the operation time, but this method has the possibility of damaging the tooth roots. At the same time, the traction pins may become loose or broken. After the operation, there may also be disadvantages such as patient pain caused by the traction pins and traction leather rings being wrapped by soft tissue. Utility Model Content

[0007] The utility model provides an intermaxillary traction device after orthognathic surgery based on an invisible orthodontic device. The utility model can perform intermaxillary elastic traction after the invisible orthodontic patient completes orthognathic surgery without the assistance of dental arch splints, intermaxillary traction nails and other methods, avoiding the risk of puncture of the skin and mucous membranes of doctors and patients and the risk of blood-borne pathogen transmission, avoiding the risk of damaging periodontal tissues and tooth roots, and ensuring that the occlusal relationship of the upper and lower teeth after orthognathic surgery meets the preoperative design requirements. The traction device is designed with a reinforced structure to ensure the structural stability of the finished product and can play the role of a terminal occlusal guide.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A post-orthognathic intermaxillary traction device based on an invisible orthodontic device, characterized in that: the maxillary traction device and the mandibular traction device are separate upper and lower jaw types, the maxillary traction device and the mandibular traction device are in contact through an occlusal surface, and a reinforcement structure is respectively arranged on the labial and buccal side of the maxillary traction device and the lingual side of the mandibular traction device, and the reinforcement structure simultaneously serves as a terminal occlusal guide plate and strengthens the stability of the structure;

[0010] The maxillary traction device is formed by an maxillary contact surface and a maxillary reinforcement rod in one piece, a maxillary occlusal position is arranged on the maxillary contact surface, and the maxillary teeth are inserted into the maxillary occlusal position, the maxillary contact surface wraps the crown of the maxillary teeth with the entire dentition, and the maxillary contact surface is provided with a plurality of maxillary traction hooks on the labial and buccal sides of each maxillary tooth, which can provide a fixing point for inter-maxillary elastic traction using a rubber band, and three observation windows are arranged on the maxillary traction device;

[0011] The mandibular traction device is formed by a mandibular contact surface and a mandibular reinforcement rod in one piece, a mandibular occlusal position is arranged on the mandibular contact surface, the mandibular occlusal position is used for mandibular teeth to be embedded in place, the mandibular contact surface is wrapped with the crown of the mandibular teeth by the entire dentition, and a plurality of mandibular traction hooks are arranged on the labial and buccal side surfaces of each mandibular crown corresponding to the mandibular contact surface, which can provide a fixing point for using a rubber band for inter-mandibular elastic traction;

[0012] A rubber ring is suspended and fixed between the maxillary traction hook and the mandibular traction hook, and the traction force provided by the rubber ring can perform inter-mandibular elastic traction between the maxillary and mandibular.

[0013] The post-orthognathic intermaxillary traction device based on the invisible orthodontic device, wherein: the three observation windows are respectively located in the anterior tooth area and the bilateral posterior tooth area of ​​the maxillary traction device, and the positioning of the maxillary teeth can be confirmed through the observation windows.

[0014] The intermaxillary traction device after orthognathic surgery based on invisible orthodontic device, wherein: the edge of the maxillary traction device is 1-2mm away from the maxillary gum, and the edge of the mandibular traction device is 1-2mm away from the mandibular gum.

[0015] The intermaxillary traction device for post-orthognathic surgery based on invisible orthodontic device, wherein: the maxillary reinforcement rod is arranged on the labial and buccal sides of the maxillary traction device, and the mandibular reinforcement rod is arranged on the lingual side of the mandibular traction device.

[0016] The post-orthognathic intermaxillary traction device based on the invisible orthodontic device, wherein: the maxillary traction hook corresponds to each tooth crown between the left and right first molars of the maxillary teeth, the maxillary traction hook forms an inclined angle with the maxillary gingival surface, the height of the maxillary traction hook is 3 mm, its diameter is 1.5 mm, and the end of the maxillary traction hook is rounded and smooth.

[0017] The post-orthognathic intermaxillary traction device based on the invisible orthodontic device, wherein: the mandibular traction hook corresponds to each tooth crown between the left and right first molars of the mandible, the mandibular traction hook forms an inclined angle with the mandibular gingival surface, the height of the mandibular traction hook is 3 mm, its diameter is 1.5 mm, and the end of the mandibular traction hook is round, blunt and smooth.

[0018] The intermaxillary traction device after orthognathic surgery based on an invisible orthodontic device, wherein: the material of the maxillary traction device and the mandibular traction device is nylon material.

[0019] The beneficial effects of the utility model are as follows: 1. It is compatible with invisible orthodontic devices. It is not necessary to grind off invisible orthodontic accessories before orthognathic surgery, and the invisible orthodontic accessories can be used for retention. It is not necessary to remove the accessories bonded to the tooth surface used for invisible orthodontics before surgery, and the guide plate is put into place by the fitting force between the teeth and the guide plate and the invisible orthodontic accessories.

[0020] 2. The postoperative traction device is designed to cover the entire dentition, and can achieve stable intermaxillary elastic traction without the need for auxiliary methods such as dental arch splints, intermaxillary traction pins or fixed orthodontic devices. There is almost no risk of skin puncture and the risk of blood-borne viruses or pathogens being transmitted, which improves the safety of application.

[0021] 3. The designed observation window can avoid the improper positioning of the teeth due to interference points during the processing and manufacturing process.

[0022] In place status.

[0023] 4. Using nylon 3D printing material, the material has excellent elasticity and toughness, which is convenient for intraoperative operation, ensuring secure positioning and easy removal and wearing.

[0024] 5. The design has a reinforced structure, which not only ensures the structural stability of the finished product, but also serves as a final occlusal guide, ensuring that the occlusal relationship of the upper and lower teeth after surgery meets the requirements of the preoperative design. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the intermaxillary traction device after orthognathic surgery.

[0026] Figure 2 This is the main structural diagram of the intermaxillary traction device after orthognathic surgery.

[0027] Figure 3 This is the left side structure diagram of the intermaxillary traction device after orthognathic surgery.

[0028] Figure 4 This is the right structural diagram of the intermaxillary traction device after orthognathic surgery.

[0029] Figure 5 It is the main structural diagram of the maxillary traction device.

[0030] Figure 6 This is a bottom-up structural diagram of the maxillary traction device.

[0031] Figure 7 This is a top view of the maxillary traction device.

[0032] Figure 8It is the main structural diagram of the mandibular traction device.

[0033] Fig. 9 It is a bottom view of the structure of the mandibular traction device.

[0034] Fig.10 It is a top view of the structure of the mandibular traction device.

[0035] Explanation of the reference numerals: 1-maxillary traction device; 11-maxillary contact surface; 12-maxillary occlusal position; 13-maxillary traction hook; 14-maxillary reinforcement rod; 15-observation window; 2-mandibular traction device; 21-mandibular contact surface; 22-mandibular occlusal position; 23-mandibular traction hook; 24-mandibular reinforcement rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] like Figure 1 to Figure 2 As shown, a post-orthognathic intermaxillary traction device based on an invisible orthodontic device is characterized in that: the maxillary traction device 1 and the mandibular traction device 2 are separate upper and lower jaw types, the maxillary traction device 1 and the mandibular traction device 2 are in contact through the occlusal surface, and reinforcement structures are respectively arranged on the labial and buccal sides of the maxillary traction device 1 and the lingual side of the mandibular traction device 2, the reinforcement structures simultaneously serve as the terminal occlusal guide plate and reinforce the stability of the structure, and the maxillary traction device 1 and the mandibular traction device 2 are made of nylon material.

[0038] The edge of the maxillary traction device 1 is 1-2 mm away from the maxillary gums, a maxillary reinforcement rod 14 is arranged on the labial and buccal sides of the maxillary traction device 1, the maxillary traction device 1 is formed integrally with a maxillary contact surface 11 and the maxillary reinforcement rod 14, a maxillary occlusal position 12 is arranged on the maxillary contact surface 11, the maxillary occlusal position 12 is for the maxillary teeth to be embedded in place, the maxillary contact surface 11 is wrapped around the crowns of the maxillary teeth in the entire dentition, a plurality of maxillary traction hooks 13 are arranged on the labial and buccal sides of each maxillary tooth of the maxillary contact surface 11, and can provide a fixing point for inter-maxillary elastic traction using a rubber band, the maxillary traction hook 13 corresponds to each tooth crown between the first molars on the left and right sides of the maxillary, the maxillary traction hook 13 forms an inclined angle with the maxillary gingival surface, the maxillary traction hook 13 has a height of 3 mm and a diameter of 1.5 mm, the end of the maxillary traction hook 13 is round, blunt and smooth, and three observation windows 15 are arranged on the maxillary traction device 1. The three observation windows 15 are respectively located in the anterior tooth area and bilateral posterior tooth areas of the maxillary traction device 1, and the positioning of the maxillary teeth can be confirmed through the observation windows 15.

[0039] The edge of the mandibular traction device 2 is 1-2 mm away from the mandibular gingiva, a mandibular reinforcement rod 24 is arranged on the lingual side of the mandibular traction device 2, the mandibular traction device 2 is integrally formed by a mandibular contact surface 21 and the mandibular reinforcement rod 24, a mandibular occlusal position 22 is arranged on the mandibular contact surface 21, the mandibular occlusal position 22 is for the mandibular teeth to be embedded in place, the mandibular contact surface 21 wraps the crown of the mandibular teeth with the entire dentition, a plurality of mandibular traction hooks 23 are arranged on the labial and buccal side surfaces of each mandibular crown corresponding to the mandibular contact surface 21, and can provide a fixing point for inter-maxillary elastic traction using a rubber band, the mandibular traction hook 23 corresponds to each tooth crown between the left and right first molars of the mandible, the mandibular traction hook 23 forms an inclined angle with the mandibular gingival surface, the mandibular traction hook 23 has a height of 3 mm, a diameter of 1.5 mm, and a rounded and smooth end of the mandibular traction hook 23.

[0040] A rubber ring is suspended and fixed between the maxillary traction hook 13 and the mandibular traction hook 23 , and the traction force provided by the rubber ring can perform inter-mandibular elastic traction between the maxillary and mandibular.

[0041] A method for designing and manufacturing an intermaxillary traction device after orthognathic surgery based on an invisible orthodontic device, characterized in that it comprises the following steps:

[0042] Step 1: The patient underwent maxillofacial spiral CT scan before surgery, and a hard plaster tooth model was made;

[0043] In this step, a CT scan is performed on the patient to collect craniomaxillofacial and dental three-dimensional data, and a hard plaster dental model is made to prepare for obtaining the patient's three-dimensional virtual dental data.

[0044] Step 2: Import the patient's CT data into the craniomaxillofacial surgery planning software in DICOM format to create a virtual three-dimensional craniomaxillary model;

[0045] In this step, the craniomaxillary and dental data obtained after CT scanning are imported into the craniomaxillofacial surgery planning software, which can establish a virtual model of the patient's craniomaxillary skull based on the imported data.

[0046] Step 3: Use laser scanning to obtain virtual dentition data in STL format by scanning the plaster tooth model, and replace the dentition data in the CT data to obtain higher dentition data accuracy;

[0047] In this step, the prepared anhydrite tooth model is placed on the loading platform of the three-dimensional laser scanning equipment for multi-dimensional and multi-angle three-dimensional scanning, so as to obtain more accurate dentition data of the anhydrite tooth model, save the dentition data in STL format, and replace the dentition data in the CT data.

[0048] Step 4: simulate the Le Fort I osteotomy of the maxilla and the sagittal splitting of the mandible on the virtual craniomaxillary model, move the maxillary dental bone segment to the target position according to the surgical plan, and then determine the target position of the mandibular dental bone segment based on the terminal occlusal relationship;

[0049] Step 5: Import the maxillary and mandibular dentition data of the patient in the terminal occlusal position into the three-dimensional virtual design software in STL format, and draw a maxillary traction device 1 and a mandibular traction device 2 with a thickness of about 1 mm on the surfaces of the maxillary and mandibular teeth, respectively. The maxillary traction device 1 and the mandibular traction device 2 wrap the entire dentition along the occlusal surface and the buccal and lingual surface, and the edge thereof is about 1-2 mm away from the edge of the gum;

[0050] Step 6: Performing Boolean operations on the data of the maxillary traction device 1 and the mandibular traction device 2 and the dentition data of the maxilla and the mandible, respectively, to create individualized inner surfaces of the maxillary traction device 1 and the mandibular traction device 2;

[0051] Step 7, a maxillary traction hook 13 is arranged on the outer surface of each tooth crown of the maxillary traction device 1, and a mandibular traction hook 23 is arranged on the outer surface of each tooth crown of the mandibular traction device 2;

[0052] In this step, the maxillary traction hook 13 and the mandibular traction hook 23 provide fixing points for postoperative elastic traction. The maxillary traction hook 13 and the mandibular traction hook 23 form an inclined angle with the gingival surface, which is used to hang and fix the rubber ring to prevent it from falling off.

[0053] Step 8: Design a maxillary reinforcement rod 14 on the labial and buccal sides of the maxillary traction device 1, and design a mandibular reinforcement rod 24 on the lingual side of the mandibular traction device 2 to increase the structural stability of the printed product, fuse the data of the maxillary traction device 1 and the maxillary reinforcement rod 14, fuse the data of the mandibular traction device 2 and the mandibular reinforcement rod, and then perform a Boolean operation between the maxillary traction device 1 and the mandibular traction device 2 to obtain an occlusal surface for the two to fit together. At the same time, the reinforced structure after the operation can play the role of a terminal occlusal guide. Use three-dimensional printing technology to make the maxillary traction device 1 and the mandibular traction device 2 with nylon material.

[0054] In the embodiment, on the second day after the patient underwent Lefort I osteotomy of the maxilla and sagittal splitting of the bilateral mandibular ramus, the patient's upper and lower jaw dentitions were inserted into the maxillary traction device 1 and the mandibular traction device 2, and the elastic traction rubber band was suspended and fixed between the maxillary traction hook 13 and the mandibular traction hook 23, and postoperative elastic intermaxillary traction was performed. The intermaxillary traction lasted for a total of 3 weeks after the operation. After 3 weeks, the wrapped and fixed elastic traction rubber band was removed, and the maxillary traction device 1 and the mandibular traction device 2 were removed to evaluate whether the occlusal relationship was satisfactory and whether it met the preoperative design.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A post-orthognathic intermaxillary traction device based on an invisible orthodontic device, characterized in that: The maxillary traction device (1) and the mandibular traction device (2) are of a separate upper and lower jaw type. The maxillary traction device (1) and the mandibular traction device (2) are in contact with each other through an occlusal surface. Reinforcement structures are respectively arranged on the labial and buccal sides of the maxillary traction device (1) and the lingual side of the mandibular traction device (2). The reinforcement structures simultaneously serve as a terminal occlusal guide plate and reinforce the stability of the structure. The maxillary traction device (1) is formed integrally of a maxillary contact surface (11) and a maxillary reinforcement rod (14); a maxillary occlusal position (12) is arranged on the maxillary contact surface (11); the maxillary occlusal position (12) is for the maxillary teeth to be embedded in place; the maxillary contact surface (11) wraps the crown of the maxillary teeth with the entire dentition; a plurality of maxillary traction hooks (13) are arranged on the labial and buccal sides of each maxillary tooth of the maxillary contact surface (11), which can provide a fixing point for intermaxillary elastic traction using a rubber band; and three observation windows (15) are arranged on the maxillary traction device (1); The mandibular traction device (2) is formed integrally with a mandibular contact surface (21) and a mandibular reinforcement rod (24); a mandibular occlusal position (22) is arranged on the mandibular contact surface (21); the mandibular occlusal position (22) is used for mandibular teeth to be embedded in place; the mandibular contact surface (21) wraps the crown of the mandibular teeth with the entire dentition; the mandibular contact surface (21) is provided with a plurality of mandibular traction hooks (23) on the labial and buccal sides of each mandibular crown, which can provide a fixing point for using a rubber band to perform inter-mandibular elastic traction; A rubber ring is suspended and fixed between the maxillary traction hook (13) and the mandibular traction hook (23), and the traction force provided by the rubber ring can perform inter-mandibular elastic traction between the maxillary and mandibular regions.

2. The post-orthognathic intermaxillary traction device based on an invisible orthodontic device according to claim 1, characterized in that: The three observation windows (15) are respectively located in the anterior tooth area and the bilateral posterior tooth areas of the maxillary traction device (1), and the position of the maxillary teeth can be confirmed through the observation windows (15).

3. The post-orthognathic intermaxillary traction device based on invisible orthodontic device according to claim 1, characterized in that: The edge of the maxillary traction device (1) is 1-2 mm away from the maxillary gum, and the edge of the mandibular traction device (2) is 1-2 mm away from the mandibular gum.

4. The post-orthognathic intermaxillary traction device based on an invisible orthodontic device according to claim 1, characterized in that: The maxillary reinforcement rod (14) is arranged on the labial and buccal sides of the maxillary traction device (1), and the mandibular reinforcement rod (24) is arranged on the lingual side of the mandibular traction device (2).

5. The post-orthognathic intermaxillary traction device based on invisible orthodontic device according to claim 1, characterized in that: The maxillary traction hook (13) corresponds to each tooth crown between the left and right first molars of the maxilla, the maxillary traction hook (13) forms an inclined angle with the maxillary gingival surface, the maxillary traction hook (13) has a height of 3 mm and a diameter of 1.5 mm, and the end of the maxillary traction hook (13) is rounded and smooth.

6. The post-orthognathic intermaxillary traction device based on invisible orthodontic device according to claim 1, characterized in that: The mandibular traction hook (23) corresponds to each tooth crown between the left and right first molars of the mandible, the mandibular traction hook (23) forms an inclined angle with the mandibular gum surface, the mandibular traction hook (23) has a height of 3 mm and a diameter of 1.5 mm, and the end of the mandibular traction hook (23) is rounded and smooth.

7. The post-orthognathic intermaxillary traction device based on invisible orthodontic device according to claim 1, characterized in that: The maxillary traction device (1) and the mandibular traction device (2) are made of nylon material.

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