Correcting appliance suite for teenager bony class III malocclusion and design method thereof

Abstract

The invention provides an appliance suite for teenager bony class III malocclusion and a design method thereof, the design method is characterized in that appliances used in three stages are respectively arranged, and the appliance in each stage comprises an upper jaw tooth socket and a lower jaw tooth socket; an anterior tooth area lip side reinforcing rib, a front traction hook, a molar area class III traction hook and a posterior tooth area palate cross rod are arranged on the upper jaw tooth socket in the first stage; a mastomolar region hollow structure and an anterior tooth region class III traction hook are arranged on the lower jaw tooth socket in the first stage; an upper jaw anterior tooth area hollow structure is arranged on the upper jaw tooth socket in the second stage, the upper jaw anterior tooth area hollow structure comprises an upper jaw anterior tooth area lingual side reinforcing rod, and the upper jaw anterior tooth area lingual side reinforcing rod abuts against the upper jaw anterior teeth and applies pressure to the upper jaw anterior teeth; a mandibular anterior tooth area hollow structure is arranged on the mandibular tooth socket in the second stage, the mandibular anterior tooth area hollow structure comprises a mandibular anterior tooth area lip side reinforcing rod, and the mandibular anterior tooth area lip side reinforcing rod abuts against mandibular anterior teeth and applies pressure to the mandibular anterior teeth; and the third-stage appliance is used for fine adjustment of teeth.

Description

Technical Field

[0001] This invention relates to the field of orthodontics, specifically to an appliance kit for skeletal Class III malocclusion in adolescents and its design method. Background Technology

[0002] In the field of orthodontics, skeletal Class III malocclusion in adolescents is a common jaw developmental abnormality. Its clinical manifestations include insufficient maxillary development in both sagittal and transverse directions, excessive mandibular development, and anterior crossbite. This type of malocclusion not only affects the patient's facial aesthetics and occlusal function, but may also lead to temporomandibular joint disorder and decreased chewing efficiency due to long-term abnormal jaw interference. Early intervention during the adolescent growth and development period is suitable.

[0003] Currently, the non-surgical treatment strategy for mild to moderate skeletal Class III malocclusion mainly relies on maxillary expansion combined with anterior traction therapy. This approach promotes the growth and remodeling of the maxilla in the sagittal and transverse directions, improves maxillary retrusion, and at the same time uses anterior traction to change the relative positional relationship between the maxilla and mandible, and to a certain extent inhibits the excessive anterior growth of the mandible, thereby achieving a benign remodeling of the skeletal relationship.

[0004] Currently, traditional orthodontic appliances typically add anterior traction hooks to the maxillary Hyrax or Hass spiral expander, using elastic bands to connect the traction hooks to the anterior traction mask. This promotes sagittal and lateral development of the maxilla while using the chin cup of the mask to appropriately inhibit mandibular anterior growth. Because the intraoral device of the appliance is a large metal structure, it easily causes patient discomfort and cannot achieve synchronous, gradual tooth alignment. The chin cup has limited effect in inhibiting mandibular anterior growth, and there are no other intraoral devices to enhance the control of the mandibular arch.

[0005] In addition, some clear aligners have anterior traction added. From a skeletal perspective, clear aligners are softer than stainless steel and cannot have enough rigidity to generate good orthodontic force transmission. From a dental perspective, due to the limited step distance of full-coverage aligners, the process of correcting anterior crossbite is slow, and the upper and lower anterior teeth collide severely during the correction process, resulting in open bite of the posterior teeth, which greatly affects chewing and eating over a long period of time. Full-coverage aligners have greater friction and cannot achieve efficient overall distal movement of the lower dentition through force transmission effect to reserve space for rapid movement to correct anterior crossbite. Summary of the Invention

[0006] In view of the problems in the prior art, the present invention provides an orthodontic appliance kit for skeletal Class III malocclusion in adolescents, the orthodontic appliance kit comprising:

[0007] The first stage orthodontic appliance includes a first maxillary brace and a first mandibular brace. The first maxillary brace is equipped with a labial reinforcement in the anterior region, an anterior traction hook, a Class III traction hook in the molar region, and a palatal crossbar in the first posterior region. The first mandibular brace is equipped with a hollow structure in the deciduous molar region and a Class III traction hook in the anterior region.

[0008] The second-stage orthodontic appliance includes a second maxillary brace and a second mandibular brace. The second maxillary brace has a hollow structure in the maxillary anterior region, which includes a lingual reinforcing bar that abuts against the maxillary anterior teeth and applies pressure thereto. The second mandibular brace has a hollow structure in the mandibular anterior region, which includes a labial reinforcing bar that abuts against the mandibular anterior teeth and applies pressure thereto.

[0009] The third-stage orthodontic appliance, comprising a third maxillary brace and a third mandibular brace, is used for fine adjustment of tooth position.

[0010] Furthermore, the first maxillary brace includes a gingival wrapping portion in the anterior region, and the anterior traction hook is disposed in the gingival wrapping portion in the anterior region.

[0011] Furthermore, the hollow structure in the deciduous molar region includes connecting rods respectively disposed on the buccal and lingual sides of the mandibular deciduous molars, with both ends of the connecting rods respectively connected to the dental crowns that wrap around the front and back teeth of the deciduous molars.

[0012] Furthermore, the hollow structure in the maxillary anterior region also includes a labial buffer bar in the maxillary anterior region, which is used to form a buffer space with the labial tooth surface of the maxillary anterior teeth.

[0013] Furthermore, the hollow structure in the mandibular anterior region also includes a lingual buffer bar in the mandibular anterior region, which is used to form a buffer space with the lingual tooth surface of the mandibular anterior teeth.

[0014] Furthermore, the second-stage orthodontic appliance is equipped with a Class III traction hook.

[0015] Furthermore, the second maxillary brace also includes a palatal crossbar in the second posterior tooth region.

[0016] Furthermore, the third maxillary brace is also provided with a palatal crossbar in the third posterior tooth region.

[0017] Furthermore, the orthodontic kit also includes a traction mask that engages with the front traction hook.

[0018] This invention also provides a design method for an orthodontic appliance kit for skeletal Class III malocclusion in adolescents. The design method includes three stages of appliance use, each stage comprising maxillary and mandibular braces.

[0019] The first-stage orthodontic appliance consists of a labial reinforcement for the anterior teeth, an anterior traction hook, a Class III traction hook for the molars, and a palatal bar for the posterior teeth. The first-stage orthodontic appliance consists of a hollow structure for the deciduous molars and a Class III traction hook for the anterior teeth.

[0020] A hollow structure for the maxillary anterior teeth region is provided on the maxillary braces of the second-stage orthodontic appliance. The hollow structure for the maxillary anterior teeth region includes a lingual reinforcing bar for the maxillary anterior teeth region, which abuts against the maxillary anterior teeth and applies pressure to them. A hollow structure for the mandibular anterior teeth region is provided on the mandibular braces of the second-stage orthodontic appliance. The hollow structure for the mandibular anterior teeth region includes a labial reinforcing bar for the mandibular anterior teeth region, which abuts against the mandibular anterior teeth and applies pressure to them.

[0021] The third-stage appliance is designed for fine-tuning the position of the teeth.

[0022] This invention relates to an orthodontic appliance kit for skeletal Class III malocclusion in adolescents, based on a three-stage targeted treatment concept. In the first stage, efficient orthodontic forces are transmitted through a palatal bar in the posterior region, reinforcing ribs in the maxillary anterior region, and anterior traction hooks to promote sagittal and lateral maxillary development. In the second stage, a hollowed-out device with a conforming and buffering tooth surface design achieves efficient distalization of the mandibular arch and rapid correction of anterior crossbite. In the third stage, conventional orthodontic treatment provides final fine-tuning of the teeth. This invention's appliance kit is simple in structure, practical, convenient, comfortable, and safe to wear, facilitating efficient growth improvement and correction of mild to moderate skeletal Class III malocclusion.

[0023] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the first maxillary aligner of the first stage orthodontic appliance kit for skeletal Class III malocclusion in adolescents, according to an embodiment of the present invention.

[0025] Figure 2 yes Figure 1 A structural diagram of the first maxillary braces from another perspective;

[0026] Figure 3This is a schematic diagram of the structure of the first mandibular aligner of the first stage orthodontic appliance kit for skeletal Class III malocclusion in adolescents, according to an embodiment of the present invention.

[0027] Figure 4 yes Figure 3 A structural diagram of the first mandibular brace from another perspective;

[0028] Figure 5 This is a schematic diagram of the second maxillary aligner of the second-stage orthodontic appliance kit for skeletal Class III malocclusion in adolescents, according to an embodiment of the present invention.

[0029] Figure 6 yes Figure 5 Another structural diagram of the second maxillary braces

[0030] Figure 7 This is a schematic diagram of the second mandibular aligner of the second-stage orthodontic appliance kit for skeletal Class III malocclusion in adolescents, according to an embodiment of the present invention.

[0031] Figure 8 yes Figure 7 A structural diagram of the second mandibular brace from another perspective.

[0032] Explanation of reference numerals in the attached figures:

[0033] 110—First maxillary brace;

[0034] 111—Groove;

[0035] 112—Reinforcing rib;

[0036] 113—Gingival wrapping of the anterior teeth region;

[0037] 114—Front towing hook;

[0038] 115—Palatal transverse bar in the posterior tooth region;

[0039] 116—Class III traction hook for the molar region;

[0040] 117—Fixed groove;

[0041] 120—First mandibular brace;

[0042] 121—Groove;

[0043] 122, 123 — Connecting rods;

[0044] 124—Class III traction hook for the anterior teeth region;

[0045] 125—Fixed groove;

[0046] 210—Second maxillary brace;

[0047] 211—Groove;

[0048] 212—Labial buffer bar in the maxillary anterior region;

[0049] 213—Lingual reinforcing bar in the maxillary anterior region;

[0050] 214—Fixed groove;

[0051] 215—Palatal transverse bar in the posterior tooth region;

[0052] 216—Class III traction hook for the molar region;

[0053] 220—Second mandibular brace;

[0054] 221—groove;

[0055] 222—Lingual buffer bar in the mandibular anterior region;

[0056] 223—Labial reinforcement bar in the mandibular anterior region;

[0057] 224—Fixed groove. Detailed Implementation

[0058] In the description of the embodiments of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The accompanying drawings are schematic diagrams or conceptual diagrams, and the relationships between the thickness and width of each part, as well as the proportional relationships between each part, etc., are not entirely consistent with their actual values.

[0059] The main design concept of the orthodontic appliance kit for skeletal Class III malocclusion in adolescents of the present invention is to provide appliances for use in three stages, each stage of which includes maxillary braces and mandibular braces, specifically including:

[0060] The first-stage orthodontic appliance consists of a labial reinforcement for the anterior teeth, an anterior traction hook, a Class III traction hook for the molars, and a palatal bar for the posterior teeth. The first-stage orthodontic appliance consists of a hollow structure for the deciduous molars and a Class III traction hook for the anterior teeth.

[0061] A hollow structure for the maxillary anterior region is set on the maxillary braces of the second-stage orthodontic appliance. The hollow structure for the maxillary anterior region includes a lingual reinforcing bar for the maxillary anterior region, which abuts against the maxillary anterior teeth and applies pressure to them. A hollow structure for the mandibular anterior region is set on the mandibular braces of the second-stage orthodontic appliance. The hollow structure for the mandibular anterior region includes a labial reinforcing bar for the mandibular anterior region, which abuts against the mandibular anterior teeth and applies pressure to them.

[0062] The third stage of orthodontic treatment can use conventional clear aligners for fine-tuning of tooth position.

[0063] Thus, the first-stage orthodontic appliance efficiently transmits orthodontic force to promote the sagittal and lateral development of the maxilla. The second-stage orthodontic appliance, especially with the assistance of Class III traction, can achieve low-friction, efficient distal movement of the lower dentition and rapid relief of anterior crossbite. The third-stage orthodontic appliance is used for the final fine adjustment of the teeth.

[0064] The orthodontic appliance kit for skeletal Class III malocclusion in adolescents in this embodiment includes three types of appliances used sequentially in three stages throughout the orthodontic treatment process: a first-stage appliance, a second-stage appliance, and a third-stage appliance. Each stage appliance includes maxillary braces and mandibular braces.

[0065] Figure 1 and Figure 2 The first maxillary brace 110 of the first-stage orthodontic appliance is shown. Similar to conventional invisible braces, it is provided with grooves 111 corresponding to the maxillary teeth, making it suitable for wrapping and wearing on the maxillary teeth. In this embodiment, the first maxillary brace 110 covers all the maxillary teeth.

[0066] The first maxillary brace 110 has a reinforcing rib 112 on the labial side of the maxillary anterior teeth region, and the position of the reinforcing rib 112 corresponds to the tooth surface of the maxillary anterior teeth. The reinforcing rib 112 is a strip-shaped structure, and its radial dimension is larger than the thickness of the main body of the first maxillary brace 110, thereby enhancing the structural strength at its location.

[0067] The first maxillary brace 110 also wraps around and covers the gingiva on the labial side of the maxillary anterior teeth. Here, the portion of the brace that wraps around and covers the gingiva is defined as the anterior gingival wrap portion 113. An anterior traction hook 114 is provided on the anterior gingival wrap portion 113. The anterior traction hook 114 is used to connect to an external traction mask. Preferably, the anterior traction hook 114 is positioned above the maxillary canines, 1-2 mm away from the gingival margin of the maxillary canines.

[0068] The synergistic effect of the reinforcing rib 112 and the anterior traction hook 114 provides ideal conditions for maxillary anterior traction in conjunction with the external traction mask. It can provide sufficient rigidity to generate the expected orthopedic force transmission, thereby achieving efficient transmission of orthopedic force through the above structure to promote maxillary sagittal development.

[0069] The first maxillary brace 110 also includes a posterior palatal bar 115 spanning the palate in the maxillary posterior tooth region. The posterior palatal bar 115 is a strip-shaped structure, with a radial dimension greater than the thickness of the main body of the first maxillary brace 110. It acts on the posterior teeth to expand the arch. Specifically, when the first maxillary brace 110 is worn on the maxillary teeth, the posterior palatal bar 115 deforms accordingly, applying a corrective force from the lingual to the buccal side to the posterior teeth on both sides of the posterior palatal bar 115. This effectively transmits the corrective force to promote maxillary lateral development. The posterior palatal bar 115 increases the rigidity of the corresponding area. The number of posterior palatal bars 115 or their radial dimensions can be adjusted according to the needs of arch expansion to provide the expected lateral arch expansion corrective force. Typically, 2 to 3 posterior palatal bars 115 are used.

[0070] The first maxillary brace 110 is also provided with a Class III traction hook 116 for the molar region. The Class III traction hook 116 for the molar region is set on the buccal side corresponding to the position of the first maxillary molar, so as to implement Class III traction.

[0071] The first maxillary brace 110 is also provided with a plurality of retention grooves 117, which can cooperate with the corresponding attachments pasted on the maxillary teeth, so that the first maxillary brace 110 can be securely worn on the maxillary teeth. In this embodiment, the retention grooves 117 are set at positions corresponding to the maxillary canines and the maxillary first molars.

[0072] Figure 3 and Figure 4The first mandibular brace 120 of the first-stage orthodontic appliance is shown. Similar to conventional invisible braces, it is provided with grooves 121 corresponding to the mandibular teeth, making it suitable for wrapping and wearing on the mandibular teeth. In this embodiment, the first mandibular brace 120 does not cover all the teeth of the upper jaw, but is provided with a hollow structure in the deciduous molar area, so that the teeth in the deciduous molar area (i.e., the mandibular first deciduous molar and the mandibular second deciduous molar) are open and exposed and not covered by the brace. The aforementioned hollow structure in the deciduous molar region includes connecting rods 122 and 123 respectively disposed on the buccal and lingual sides of the mandibular deciduous molars. Connecting rods 122 and 123 are strip-shaped structures, and their radial dimensions are greater than the thickness of the main body of the first mandibular dental sleeve 120. The extension direction of connecting rod 122 along its length direction conforms to the outline of the buccal tooth surface of the mandibular deciduous molars, and its two ends are respectively connected to the dental sleeves covering the mandibular canines and mandibular first molars. The extension direction of connecting rod 123 along its length direction conforms to the outline of the lingual tooth surface of the deciduous molars, and its two ends are respectively connected to the dental sleeves covering the canines and first molars.

[0073] The first mandibular brace 120 is also provided with an anterior teeth region Class III traction hook 124, which is set on the labial side corresponding to the canines. It works in conjunction with the first maxillary brace 110 molar region Class III traction hook 116 to implement Class III traction.

[0074] The first mandibular brace 120 is also provided with a plurality of retention grooves 125, which can cooperate with the corresponding attachments pasted on the mandibular teeth, so that the first mandibular brace 120 can be securely worn on the mandibular teeth. In this embodiment, the retention grooves 125 are set at positions corresponding to the mandibular canines and the mandibular first molars.

[0075] The first-stage orthodontic appliance in this embodiment, as can be seen from the structure of the first maxillary brace 110 and the first mandibular brace 120, targets the developmental stage of adolescents. Specifically, at this stage, the first and second deciduous molars in the posterior region have not yet been replaced by permanent teeth, and the second molar has not yet erupted. This is also the preferred time for treatment of skeletal Class III malocclusion in adolescents. The hollow structure of the deciduous molar region of the first mandibular brace 120 reduces the resistance to tooth movement in the posterior region. In synergy with the Class III traction of the first maxillary brace 110, it enables the distal tilting movement of the mandibular canines and the simultaneous distal movement of the entire mandibular posterior teeth. The entire process from the mandibular canines to the mandibular first molars is in contact, thereby achieving efficient distal movement of the corresponding mandibular dentition under the assistance of light Class III traction, leaving sufficient space for the alignment and retraction of the mandibular incisors.

[0076] Figure 5 and Figure 6The second maxillary aligner 210 of the second-stage orthodontic appliance is shown. The second maxillary aligner 210 has grooves 211 corresponding to the maxillary posterior teeth region and a hollow structure for the maxillary anterior teeth region, making it suitable for wrapping around the maxillary posterior teeth and exposing the maxillary anterior teeth. The hollow structure for the maxillary anterior teeth region includes a labial buffer bar 212 and a lingual reinforcing bar 213 respectively located on the labial and lingual sides of the maxillary anterior teeth. The labial buffer bar 212 and the lingual reinforcing bar 213 are strip-shaped structures, and their radial dimension is greater than the thickness of the main body of the second maxillary aligner 210.

[0077] The labial buffer bar 212 of the maxillary anterior region extends along its length direction in accordance with the shape contour of the labial surface of the maxillary anterior teeth. Its two ends are respectively connected to the braces covering the first deciduous molars on both sides of the maxilla. The labial buffer bar 212 of the maxillary anterior region is used to form a buffer space with the labial surface of the maxillary anterior teeth. Since it does not provide orthodontic force to the maxillary anterior teeth, the labial buffer bar 212 of the maxillary anterior region can be set to fit in close contact with the labial surface of the maxillary anterior teeth, or it can be set to have a certain gap with the labial surface of the maxillary anterior teeth, or it can have local contact.

[0078] The lingual reinforcing bar 213 in the maxillary anterior region extends along its length in accordance with the contour of the lingual surface of the maxillary anterior teeth. Its two ends are respectively connected to the braces covering the first deciduous molars on both sides of the maxilla. The lingual reinforcing bar 213 in the maxillary anterior region is used to provide orthodontic force to the maxillary anterior teeth from the lingual to the labial direction. Specifically, when the second maxillary brace 210 is worn on the maxillary teeth, the lingual reinforcing bar 213 in the maxillary anterior region will deform accordingly and abut against the maxillary anterior teeth. Under the action of its restoring force, it applies orthodontic force to the maxillary anterior teeth from the lingual to the labial direction. Preferably, the radial dimension of the lingual reinforcing bar 213 in the maxillary anterior region is greater than the radial dimension of the labial buffer bar 212 in the maxillary anterior region.

[0079] The second maxillary brace 210 is also provided with a plurality of retention grooves 214, which can cooperate with the corresponding attachments pasted on the maxillary teeth, so that the second maxillary brace 210 can be securely worn on the maxillary teeth. In this embodiment, the retention grooves 214 are set at the position corresponding to the first maxillary molar.

[0080] Figure 7 and Figure 8The second mandibular aligner 220 of the second-stage orthodontic appliance is shown. The second mandibular aligner 220 has grooves 221 corresponding to the mandibular posterior teeth region and a hollow structure for the mandibular anterior teeth region, making it suitable for wrapping around the mandibular posterior teeth and exposing the mandibular anterior teeth. The hollow structure for the mandibular anterior teeth region includes a lingual buffer bar 222 and a labial reinforcing bar 223 respectively located on the lingual and labial sides of the mandibular anterior teeth region. The lingual buffer bar 222 and the labial reinforcing bar 223 are strip-shaped structures, and their radial dimension is greater than the thickness of the main body of the second mandibular aligner 220.

[0081] The lingual buffer bar 222 of the mandibular anterior region extends along its length direction in accordance with the shape contour of the lingual tooth surface of the mandibular anterior teeth. Its two ends are respectively connected to the braces covering the first deciduous molars on both sides of the mandible. The lingual buffer bar 222 of the mandibular anterior region is used to form a buffer space with the lingual tooth surface of the mandibular anterior teeth. Since it does not provide orthodontic force to the mandibular anterior teeth, the lingual buffer bar 222 of the mandibular anterior region can be set to fit against the lingual tooth surface of the mandibular anterior teeth, or it can be set to have a certain gap with the lingual tooth surface of the mandibular anterior teeth, or it can have local contact.

[0082] The labial reinforcing bar 223 of the mandibular anterior region extends along its length in accordance with the shape of the labial surface of the mandibular anterior teeth. Its two ends are respectively connected to the braces covering the first deciduous molars on both sides of the mandible. The labial reinforcing bar 223 of the mandibular anterior region is used to provide orthodontic force to the mandibular anterior teeth from the labial side to the lingual side. Specifically, when the second mandibular brace 220 is worn on the mandibular teeth, the labial reinforcing bar 223 of the mandibular anterior region will deform accordingly and abut against the mandibular anterior teeth. Under the action of its restoring force, it applies orthodontic force to the mandibular anterior teeth from the labial side to the lingual side. Preferably, the radial dimension of the labial reinforcing bar 223 of the mandibular anterior region is greater than the radial dimension of the lingual buffer bar 222 of the mandibular anterior region.

[0083] The second mandibular brace 220 is also provided with a plurality of retention grooves 224, which can cooperate with the corresponding attachments pasted on the mandibular teeth, so that the second maxillary brace 220 can be securely worn on the mandibular teeth. In this embodiment, the retention grooves 224 are set at positions corresponding to the maxillary second deciduous molar and the maxillary first molar.

[0084] The second-stage orthodontic appliance of this embodiment allows for a skip-step correction of the anterior teeth of both the upper and lower jaws to eliminate reverse overbite. Preferably, a Class III traction hook 216 for the molar region is provided on the second maxillary brace 210, as shown in the reference. Figure 5 The Class III traction hook 216 in the molar region is set on the buccal side corresponding to the position of the maxillary first molar. It works in conjunction with the implant anchorage screw set in the mandible to implement Class III traction. In this way, the time for correcting anterior crossbite can be minimized with the cooperation of Class III traction and reinforcing bar, while achieving low-friction overall efficient distal movement of the mandibular arch and rapid jump relief of anterior crossbite.

[0085] The third-stage orthodontic appliance in this embodiment includes a third maxillary brace and a third mandibular brace, which can be a conventional invisible brace, to make a final fine adjustment to the position of the teeth.

[0086] Orthodontic treatment is a relatively long process, involving multiple adjustment goals in each stage. Waiting for all adjustments to be completed simultaneously before moving on to the next stage often prolongs the time and cycle of orthodontic treatment. Therefore, carrying over some adjustments from the previous stage to the next stage can help shorten the time and cycle of orthodontic treatment.

[0087] In view of this, in some other embodiments, one or more of the following settings may be optionally added to the second-stage and third-stage orthodontic appliances.

[0088] (1) A palatal crossbar 215 is installed in the maxillary posterior tooth region of the second maxillary brace 210, as referenced. Figure 5 Its structure and setup are similar to the palatal crossbar 115 in the posterior region of the first maxillary brace 110, for use in continuing the first stage of arch expansion or for retention after arch expansion.

[0089] (2) A palatal crossbar is provided on the third maxillary crown, which is the same structure as the palatal crossbar 115 of the first maxillary crown 110, for use in continuing arch expansion or for retention after arch expansion.

[0090] (3) Class III traction hooks are installed on the third maxillary brace and the third mandibular brace respectively to maintain the traction effect of the previous stage through Class III traction.

[0091] (4) On the third maxillary brace, the anterior gingival wrapping part 113 and the anterior traction hook 114 of the first maxillary brace 110 are set, and the external traction mask is used to fine adjust or maintain the traction effect in the sagittal direction of the previous stage.

[0092] Each upper and lower aligner of the orthodontic appliance in each stage of this embodiment can be manufactured as a single piece, preferably by 3D printing.

[0093] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An appliance kit for the treatment of skeletal class III malocclusion in a young patient, characterized in that, The application relates to a three-stage orthodontic appliance. The first-stage appliance comprises a first upper dental cover and a first lower dental cover, the first upper dental cover is provided with a front tooth area labial reinforcing rib, a front traction hook, a molar area Class III traction hook and a first posterior tooth area palatal crossbar, and the first lower dental cover is provided with a deciduous molar area hollow structure and a front tooth area Class III traction hook. The second-stage appliance comprises a second upper dental cover and a second lower dental cover, the second upper dental cover is provided with an upper front tooth area hollow structure, the upper front tooth area hollow structure comprises an upper front tooth area lingual reinforcing rod which abuts against and exerts pressure on the upper front teeth, and the second lower dental cover is provided with a lower front tooth area hollow structure, the lower front tooth area hollow structure comprises a lower front tooth area labial reinforcing rod which abuts against and exerts pressure on the lower front teeth. The third-stage appliance comprises a third upper dental cover and a third lower dental cover and is used for fine adjustment of tooth positions.

2. The appliance kit of claim 1, wherein, The first upper dental cover comprises a front tooth area gum wrapping part, and the front traction hook is arranged on the front tooth area gum wrapping part.

3. The appliance kit of claim 1, wherein, The deciduous molar area hollow structure comprises connecting rods arranged on the buccal side and the lingual side of the lower deciduous molar respectively, and the two ends of the connecting rods are connected to the dental covers wrapping the front and rear teeth of the deciduous molar respectively.

4. The appliance kit of claim 1, wherein, The upper front tooth area hollow structure further comprises an upper front tooth area labial buffer rod which is used for forming a buffer space with the labial surface of the upper front teeth.

5. The appliance kit of claim 1, wherein, The lower front tooth area hollow structure further comprises a lower front tooth area lingual buffer rod which is used for forming a buffer space with the lingual surface of the lower front teeth.

6. The appliance kit of claim 1, wherein, The second-stage appliance is provided with a Class III traction hook.

7. The appliance kit of claim 1, wherein, The second upper dental cover is further provided with a second posterior tooth area palatal crossbar.

8. The appliance kit of claim 1, wherein, The third upper dental cover is further provided with a third posterior tooth area palatal crossbar.

9. The appliance kit of claim 1, wherein, The application further comprises a traction mask matched with the front traction hook.

10. A design method for an orthodontic appliance kit for skeletal Class III malocclusion in adolescents, characterized in that, The application further comprises three-stage appliances, each of which comprises an upper dental cover and a lower dental cover. The first-stage appliance comprises a first upper dental cover and a first lower dental cover, the first upper dental cover is provided with a front tooth area labial reinforcing rib, a front traction hook, a molar area Class III traction hook and a first posterior tooth area palatal crossbar, and the first lower dental cover is provided with a deciduous molar area hollow structure and a front tooth area Class III traction hook. The second-stage appliance comprises a second upper dental cover and a second lower dental cover, the second upper dental cover is provided with an upper front tooth area hollow structure, the upper front tooth area hollow structure comprises an upper front tooth area lingual reinforcing rod which abuts against and exerts pressure on the upper front teeth, and the second lower dental cover is provided with a lower front tooth area hollow structure, the lower front tooth area hollow structure comprises a lower front tooth area labial reinforcing rod which abuts against and exerts pressure on the lower front teeth. The third-stage appliance is used for fine adjustment of tooth positions.

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