Correcting appliance for treating class-II high-angle mandibular retraction

Abstract

The utility model provides an appliance for treating class II high angle mandibular retraction, which comprises an intraoral device and an extraoral device, the extraoral device comprises an improved chin pocket and a head anchorage, the improved chin pocket is used for contacting with a mandibular to be corrected, a connecting rod is arranged on the improved chin pocket, a support is arranged on the head anchorage, a plurality of traction hooks are arranged on the support, and the traction hooks are connected with the connecting rod. The connecting rod is connected with a traction hook through an elastic traction rubber band; the intraoral device is a jaw pad arranged at the rear teeth of the lower jaw; the jaw pad forms a fulcrum at the rear teeth of the lower jaw, the head anchorage generates forward traction force to the improved chin pocket through the elastic traction rubber band and the traction hook, the jaw pad is matched with chewing of a patient, the effect of pressing the rear teeth is generated when the upper jaw and the lower jaw are in occlusion contact, and the lower jaw is guided to grow forwards and upwards to treat the rear shrinkage face type of the lower jaw. The effects of lowering back teeth, improving the high angle trend and correcting the forward leaning posture of the cranium and the neck can be achieved, the treatment period is greatly shortened, and the treatment effect is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the orthodontics field, concretely relates to a kind of appliance for treating class II high-angle mandibular retrusion. BACKGROUND

[0002] Class II skeletal malocclusion is a common dental and maxillofacial deformity in early childhood, and its pathogenesis is the sagittal position relationship between the upper and lower jaws. It is often manifested as mandibular hypoplasia, with or without maxillary hyperplasia. In order to adjust the sagittal position relationship between the upper and lower jaws as soon as possible, correct mandibular retrusion, stimulate mandibular growth and inhibit maxillary growth, early treatment should be performed. Early treatment of mandibular retrusion often uses functional orthopedic treatment, i.e., through the use of functional appliances in the mouth to reconstruct occlusion, change the position of the lower jaw, stretch the masticatory muscles, perioral muscles and periosteum, guide the coordinated growth of teeth, alveolar bone and jaw bone with the help of the contraction force of the above-mentioned soft tissues, and lead the mandible to adjust the position relationship between the jaw bones. Commonly used appliances include myodent, Frank II, double bite pad appliance and Herbst bite lead appliance, etc. For class II children patients with maxillary protrusion, combined extraoral orthopedic treatment is often used, i.e., early gravity control treatment of jaw bone growth, through the use of extraoral devices, with head, forehead, chin and neck as anchorage, and combining with the transmission of force from intraoral appliances to the maxilla, to inhibit the sagittal or vertical development of the maxilla and coordinate the position relationship between the upper and lower jaw bones. For example, headgear myodent. For patients with high peak of growth and development in bone age, the appearance of lateral face can be significantly improved after wearing for 6-12 months, and the possibility of future complex orthodontic treatment is reduced.

[0003] While functional orthodontic treatment combined with extraoral force therapy can achieve good results for most patients with skeletal Class II malocclusion, vertical control remains a challenge for those with high-angle skeletal Class II malocclusion and mandibular retrusion. High-angle skeletal Class II malocclusion is a complex malocclusion characterized by the mandible being positioned distally relative to the maxilla, an increased mandibular plane angle, and an increased lower third of facial height, which easily places a significant load on the temporomandibular joint. Severe mandibular retrusion can cause airway narrowing, affecting normal respiratory function. To achieve airway opening, these patients often exhibit craniocervical tilt. Current treatment strategies for high-angle skeletal Class II malocclusion include functional orthodontic treatment combined with extraoral force therapy and implant anchorage to intrude posterior teeth and rotate the mandibular plane counterclockwise. Bilgic's research found that functional orthodontic treatment alone, such as muscle activators, can cause clockwise rotation of the mandible, increasing lower facial height and potentially worsening the high-angle facial profile. Bilbo EE et al. believe that extraoral high traction orthodontic treatment has no effect on vertical skeletal changes and cannot improve the high-angle facial profile. Implant anchorage is an invasive procedure, often unacceptable to patients in the mixed dentition stage, and carries a risk of dislodgement due to the lower alveolar bone density in children. Furthermore, the aforementioned orthodontic methods have failed to improve craniocervical tilt caused by mandibular retrusion. Therefore, there is currently a lack of orthodontic appliances that can guide mandibular growth forward and improve the high-angle facial profile. Utility Model Content

[0004] To address the aforementioned issues, this invention provides an orthodontic appliance for treating Class II high-angle mandibular retrusion. During the extraoral anchorage process guiding the mandible to grow forward and upward, an intraoral occlusal pad base is used to assist in treating mandibular retrusion, depressing the posterior teeth, and rotating the mandibular plane counterclockwise to improve the high-angle trend. This provides a new method for the early treatment of Class II high-angle mandibular retrusion patients.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an orthodontic appliance for treating Class II high-angle mandibular retrusion, comprising an intraoral device and an extraoral device. The extraoral device includes a modified chin cup and a head anchorage. The modified chin cup is used to contact the mandible to be corrected. A connecting rod is provided on the modified chin cup. A bracket is provided on the head anchorage. Multiple traction hooks are provided on the bracket. The connecting rod is connected to the traction hooks through an elastic traction band. The intraoral device is a chin pad provided at the posterior mandibular teeth.

[0006] Furthermore, the modified chin pocket has cotton cloth on the contact surface with the mandible to be corrected, and the modified chin pocket has ventilation holes; wearing the orthodontic appliance for a long time may cause pressure or friction on the skin, and the cotton cloth contact surface can effectively reduce this adverse effect and protect the skin from damage.

[0007] Furthermore, the jaw pad is made of resin material and is manufactured using 3D printing technology based on oral scanning data of the mandibular posterior teeth. Personalized design based on the patient's oral scanning data can ensure a precise match between the jaw pad and the patient's oral cavity, improving wearing comfort and effectiveness. The 3D printing technology can print jaw pads with complex structures and fine details, which can meet the personalized needs of different patients and improve treatment results.

[0008] Furthermore, the head support includes a top rigid ring and a head and neck harness, which is connected to the back support.

[0009] Furthermore, the back support includes interconnected shoulder straps and a chest strap, the chest strap wrapping around the back of the chest, with the two ends of the shoulder straps connected to the front of the chest strap and the back of the chest strap, respectively.

[0010] Furthermore, the back support and head and neck straps are both made of polyester fiber material.

[0011] Furthermore, an arc-shaped rigid band is connected to the top rigid ring. The shape of the arc-shaped rigid band is adapted to the top of the head. A fastening structure is provided on the arc-shaped rigid band or the top rigid ring. The bracket is connected to the arc-shaped rigid band or the top rigid ring through the fastening structure.

[0012] Furthermore, a cotton washer is provided on the inner side of the top rigid ring.

[0013] Furthermore, the bracket is wrapped more than half a turn around the top rigid ring and secured to the top rigid ring.

[0014] Furthermore, the modified chin support is also connected to the top rigid ring via an elastic band or an adjustable face frame.

[0015] Compared with existing technologies, this invention has at least the following beneficial effects: The modified chin support is used to contact the mandible to be corrected, transmitting the head anchorage and the traction force of the elastic traction band to the mandible, so that the mandible receives an oblique upward traction force; the intraoral device uses a resin material chin pad, which is placed at the posterior teeth of the mandible and is a removable orthodontic appliance that can form a fulcrum. The chin pad forms a fulcrum at the posterior teeth of the mandible, and the head anchorage generates an anterior traction force on the modified chin support through the elastic traction band and traction hook, gradually lengthening the mandible, causing the mandible to grow forward and upward, while simultaneously treating mandibular retrusion and eliminating skeletal Class II high angle; the chin pad cooperates with the patient's chewing, producing a depressing effect on the posterior teeth when the upper and lower jaws occlude, guiding the mandible to grow forward and upward to treat the mandibular retrusion facial profile, while also depressing the posterior teeth to improve the high angle trend and correct the craniocervical anterior tilt posture, greatly shortening the treatment cycle and significantly improving the treatment effect. Attached Figure Description

[0016] Figure 1 This is a side view of the present invention.

[0017] Figure 2 This is a schematic diagram of the connection structure between the head support and the bracket of this utility model.

[0018] Figure 3 This is a schematic diagram of the back structure of the present invention with back support.

[0019] In the attached diagram, 1-modified chin support, 2-head support, 3-bracket, 4-connecting rod, 5-traction hook, 6-elastic traction band, 7-back support, and 8-head and neck strap. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] refer to Figure 1 This utility model provides an orthodontic appliance for treating Class II high-angle mandibular retrusion, including an intraoral device and an extraoral device. The extraoral device includes a modified chin pocket 1 and a head anchorage 2. The modified chin pocket 1 is equipped with a connecting rod 4, and the head anchorage 2 is equipped with a bracket 3. The bracket 3 is equipped with multiple traction hooks 5. The connecting rod 4 is connected to the traction hooks 5 through elastic traction bands 6. The intraoral device is a chin pad placed at the mandibular posterior teeth. The modified chin pocket 1 is used to contact the mandible to be corrected, and transmits the traction force of the head anchorage and the elastic traction bands 6 to the mandible, so that the mandible receives an oblique upward traction force. The intraoral device is a resin chin pad placed at the mandibular posterior teeth. It is a removable orthodontic appliance that can form a fulcrum. The jaw pad forms a fulcrum at the mandibular posterior teeth. The head anchorage 2 generates an anterior traction force on the modified chin sac 1 through the elastic traction rubber band 6 and traction hook 5, gradually lengthening the mandible and causing the mandible to grow forward and upward. At the same time, it treats mandibular retrusion and eliminates skeletal Class II high angle. The jaw pad works in conjunction with the patient's chewing and depresses the posterior teeth when the upper and lower jaws make contact during occlusion.

[0022] As those skilled in the art will know, the modified chin support 1 is also connected to the top rigid ring via an elastic band or an adjustable face frame. In the scheme described in this application, the elastic band here is only used to connect the modified chin support 1 to the head anchorage and does not provide additional corrective force. Similarly, when the modified chin support 1 is connected to the top rigid ring via an adjustable face frame, the adjustable face frame is only used to place the modified chin support 1 at the chin. Under the action of the elastic traction band 6, the modified chin support 1 tends to move obliquely upward, and the adjustable face frame and the elastic traction band 6 do not generate resistance.

[0023] Example 1: The modified chin support has a connecting rod inside that connects to the head anchorage. The connecting rod is equipped with a movable traction hook / pin, allowing for clinical adjustment of the traction direction and force. For patients with bony Class II high angle, the traction direction is anterior-superior, approximately 300-500g. During treatment, it needs to be worn for a sufficient period, generally around 12 hours, and the elastic band needs to be changed daily to achieve intermittent continuous force.

[0024] refer to Figure 2 and Figure 3 In Example 2, the head anchorage 2 includes a top rigid ring and a head and neck harness 8, which is connected to a back anchorage 7. The back anchorage 7, made of polyester fiber, is connected to the head anchorage 2 via the head and neck harness 8. This part counteracts the force guiding the upward and forward growth of the mandible, thus improving the forward tilt posture of the craniocervical spine to some extent. The back anchorage 7 includes interconnected shoulder straps and a chest strap. The chest strap wraps around the chest and back, with the two ends of the shoulder straps connected to the front of the chest strap and the back of the chest strap, respectively.

[0025] refer to Figure 1 and Figure 2 , Figure 2 This is a cross-sectional schematic diagram of an feasible fastening structure and a support 3. A fastening structure is provided on the head support 2. The fastening structure includes a fastening block with two fastening screws and a connecting hole. The fastening screws are perpendicular to the axis of the connecting hole. The upper end of the support 3 is inserted into the connecting hole. After the fastening screws are tightened, they press against the section of the support 3 inserted into the connecting hole.

[0026] As a further optimization, to improve wearing comfort, the modified chin guard 1 has cotton cloth on the contact surface with the chin to be corrected, and the modified chin guard 1 has ventilation holes; at the same time, a cotton pad can be placed inside the top rigid ring; the cotton pad improves comfort without causing excessive cushioning between the top rigid ring and the head, reducing the direct pressure of the rigid ring on the scalp and improving wearing comfort. At the same time, due to its moderate elasticity and support, it will not interfere with the normal function of the orthodontic appliance, ensuring the orthodontic effect.

[0027] The jaw pad is made of resin material and is manufactured using 3D printing technology based on oral scan data of the mandibular posterior teeth. If a personalized design based on the patient's oral scan data is selected, it can ensure a precise match between the jaw pad and the patient's oral cavity, improving wearing comfort and effectiveness. The 3D printing technology can print jaw pads with complex structures and fine details, which can meet the personalized needs of different patients and improve treatment results.

[0028] The back support 7 and the head and neck strap 8 are both made of polyester fiber material and can be purchased directly from the market.

[0029] An arc-shaped rigid band can also be connected to the top rigid ring. The shape of the arc-shaped rigid band is adapted to the top of the head. The arc-shaped rigid band or the top rigid ring is provided with a threaded buckle. The bracket 3 is connected to the arc-shaped rigid band or the top rigid ring through the threaded buckle. This enhances the stability of the head support 2 and the bracket 3. At the same time, the bracket 3 is connected to the head support through the threaded buckle, which improves the adjustability and applicability of the device. The upper end of the bracket 3 is provided with a thread. The upper end of the bracket 3 is screwed into the threaded buckle. A fastening nut is provided on the outside of the threaded buckle. The fastening nut is used to help fasten the bracket 3 to the threaded buckle and can also be used to adjust the relative angle between the bracket 3 and the threaded opening, so that the main body of the bracket 3 is vertically downward when worn.

[0030] In Example 3, the support 3 is wrapped more than half a circle around the top rigid ring and is fastened to the top rigid ring. In this case, there is no need to use back anchorage or head and neck strap 8. The corrective force is provided solely by the head anchorage 2. The head anchorage 2 transmits the corrective force to the mandible through the support 3 and the top rigid ring. By utilizing the natural growth and adaptability of the mandible, it is guided to move forward or downward, increasing the contact area between the support and the top rigid ring, thereby improving the stability of the connection and the efficiency of the transmission of corrective force. This is suitable for cases of mild retrusion of the high-angle mandible in Class II. The rigid ring can be made of plastic.

[0031] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. An orthodontic appliance for treating Class II high-angle mandibular retrusion, characterized in that, It includes an intraoral device and an extraoral device. The extraoral device includes a modified chin cup (1) and a head anchor (2). The modified chin cup (1) is used to contact the mandible to be corrected. A connecting rod (4) is provided on the modified chin cup (1). A bracket (3) is provided on the head anchor (2). Multiple traction hooks (5) are provided on the bracket (3). The connecting rod (4) is connected to the traction hooks (5) through an elastic traction rubber band (6). The intraoral device is a chin pad provided at the mandibular posterior teeth.

2. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 1, characterized in that, The modified chin support (1) has cotton cloth on the contact surface with the mandible to be corrected, and the modified chin support (1) has ventilation holes.

3. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 1, characterized in that, The jaw pad is made of resin material and is manufactured using 3D printing technology based on oral scan data of the mandibular posterior teeth.

4. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 1, characterized in that, The head anchorage (2) includes a top rigid ring and a head and neck harness (8), with the head and neck harness connected to the back anchorage (7).

5. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, The back brace (7) includes a shoulder strap and a chest strap that are connected to each other. The chest strap wraps around the back of the chest, and the two ends of the shoulder strap are connected to the front of the chest strap and the back of the chest strap, respectively.

6. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, The back support (7) and the head and neck strap (8) are both made of polyester fiber material.

7. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, An arc-shaped rigid band is connected to the top rigid ring. The shape of the arc-shaped rigid band is adapted to the top of the head. A fastening structure is provided on the arc-shaped rigid band or the top rigid ring. The bracket (3) is connected to the arc-shaped rigid band or the top rigid ring through the fastening structure.

8. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, A cotton washer is provided on the inside of the top rigid ring.

9. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, The bracket (3) is wrapped around the top rigid ring more than half a turn and fastened to the top rigid ring.

10. The orthodontic appliance for treating Class II high-angle mandibular retrusion according to claim 4, characterized in that, The modified chin hood (1) is also connected to the top rigid ring by an elastic band or an adjustable face frame.

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