Cantilever type appliance for rear tooth locking and manufacturing method thereof

Abstract

The invention discloses a cantilever type appliance for locking back teeth. The cantilever type appliance comprises a retainer, a connector and a cantilever body, the retainers are ring-shaped and sleeve part of tooth crests in the circumferential direction of the teeth, and at least two retainers are symmetrically arranged in the dentition arrangement direction; the connecting body comprises a tooth side connecting body and a palatal side connecting body, the tooth side connecting body is connected between the retainers on the same side, and the palatal side connecting body is connected between the retainers on the opposite side; the cantilever body is formed by extending the retainer / connector towards the depth of the dentition, the cantilever body is arranged on the buccal side / palatal side of the tooth, the cantilever body is arranged close to the palatal side of the buccal inclined tooth, and the cantilever body is formed on the retainer and extends towards the depth of the dentition; the cantilever type appliance is customized for the patient according to the locking degree of the internal rear teeth of the patient, then the cantilever type upper jaw appliance and the cantilever type lower jaw appliance are integrally printed through the 3D printing technology, foreign body sensation in the oral cavity of the patient can be weakened, and the problem that welding points in an existing appliance are prone to desoldering is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of posterior teeth occlusion correction devices, and in particular to a cantilevered corrective appliance for posterior teeth occlusion and a manufacturing method thereof. Background Art

[0002] According to the buccal and lingual position relationship of the upper and lower posterior teeth, lock can be clinically divided into positive lock and negative lock. Positive lock means that the lingual slope of the lingual tip of the maxillary posterior teeth is located on the buccal side of the buccal slope of the buccal tip of the mandibular posterior teeth, and there is no occlusal contact between the occlusal surfaces; negative lock means that the buccal slope of the buccal tip of the upper posterior teeth is located on the lingual side of the lingual slope of the lingual tip of the lower posterior teeth, and there is no occlusal contact between the occlusal surfaces. Positive and negative lock can occur unilaterally or bilaterally, most commonly in the upper and lower second molars, and lock in the premolar area is also common.

[0003] In the prior art, a modified palatal bar is often used to correct the locking of the second molar. A stainless steel wire with a diameter of 1.2 mm is bent into a palatal bar on the palatal side of the maxillary model. The palatal bar is appropriately extended into a cantilever at the far end of the locking side, and extends inward and backward to the palatal root of the maxillary second molar on the locking side. The end is bent into an open small circle. The force point of the small circle at the end is approximately located at the relative position of about 1 / 3 of the middle of the root of the palatal side of the second molar. The palatal bar and the cantilever should be about 0.5 mm away from the palatal mucosa. The part where the palatal bar and the band are welded is hammered flat or roughened to increase the contact area of ​​the welding point. The prepared modified palatal bar is fixed and embedded with plaster to expose the welding part, silver-welded, polished, and the cantilever appliance traction hook and the buccal tube bonded to the maxillary buccal side are pulled by a rubber chain to release the locking. This method relies on the intra-maxillary support to generate gingival and palatal forces on the locking teeth to correct the tilted molars.

[0004] However, in the maxillary modified palatal bar correction scheme, there are silver soldering points, which may cause desoldering, wire breakage, oral hygiene problems, and strong foreign body sensation. Summary of the invention

[0005] The purpose of the present invention is to provide a cantilever orthodontic appliance for posterior teeth locking and a method for manufacturing the same, so as to solve the problems of strong foreign body sensation in the oral cavity, the presence of welding points, and poor reliability of the prestress provided by the rubber chain during the process of releasing the locking of the orthodontic appliance.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] In the first aspect of the present invention, there is provided a cantilever orthodontic appliance for posterior tooth locking, comprising: a retainer, which is a ring-shaped sleeve bonded to the circumferentially surrounding part of the tooth top of the tooth, and at least two retainers are symmetrically arranged in the direction of tooth arrangement; a connector, the connector includes a tooth-side connector and a palatal connector, the tooth-side connector is connected between the retainers located on the same side, the tooth-side connector is close to the inner side of the tooth and surrounds part of the axial surface of the tooth; the palatal connector is connected between the retainers located on the opposite side, and the palatal connector is arc-shaped and close to the palatal mucosa; a cantilever body, the cantilever body is formed by extending the retainer / connector toward the deep part of the tooth, the cantilever body is arranged on the buccal / palatal side of the tooth, the cantilever body is arranged close to the palatal side of the buccal-inclined tooth, and the cantilever body is close to the palatal side of the buccal-inclined tooth. A cantilever body is arranged on the buccal side of the mandibular lingually inclined tooth, and a cantilever body is formed on the retainer and extends deep into the dentition, and the cantilever body extends along the tangent direction of the retainer; a lingual buckle opposite to the position of the cantilever body is arranged on the inner side of the mandibular dentition tooth, and the cantilever body is connected to the lingual buckle and tensioned by a rubber chain inserted and fixed therein, so that the tensioning force of the rubber chain acts on the affected tooth through the retainer and the connector for correction; or, the cantilever body is arranged close to the inner side of the periodontium of the maxillary dentition, and the cantilever body is formed at the end of the connector and extends deep into the dentition; a buccal tube opposite to the position of the cantilever body is arranged on the outer side of the maxillary dentition tooth, and the cantilever body is connected to the buccal tube and tensioned by a rubber chain inserted and fixed therein, so that the tensioning force of the rubber chain acts on the affected tooth through the retainer and the connector.

[0008] Furthermore, a through traction hole is opened on the cantilever body for inserting a rubber chain, and the end of the rubber chain forms a loop knot and is fixed to the traction hole; wherein, a flexible ring pad is provided in the traction hole and surrounded by its inner ring side, and a plurality of limiting protrusions are arranged at equal intervals on the inner ring side of the flexible ring pad, and after the rubber chain is inserted into the flexible ring pad, it is limited between adjacent limiting protrusions.

[0009] Furthermore, the middle areas of adjacent limiting protrusions and the inner ring wall of the flexible ring pad enclose a semi-elliptical structure with a gap on the inner side; wherein the ends of the limiting protrusions extend in both directions along the circumference of the flexible ring pad to limit the gap between adjacent limiting protrusions; the flexible ring pad is provided with a limiting groove for embedding a rubber chain to limit its circumferential slippage, and the limiting groove is opened in the middle of the middle area of ​​the adjacent limiting protrusions.

[0010] Furthermore, a supporting protrusion is provided on the inner ring side of the traction hole. After the flexible ring gasket is inserted into the traction hole, the part of the supporting protrusion protruding from the inner ring side of the flexible ring gasket forms a limit for the rubber chain; wherein, limiting holes corresponding to the positions of the supporting protrusions are equidistantly opened on the flexible ring gasket. After the flexible ring gasket is inserted into the traction hole, each supporting protrusion passes through the limiting hole corresponding to its position, and the middle area of ​​adjacent supporting protrusions forms a limit for the rubber chain.

[0011] Furthermore, a slit is provided on one side of the traction hole to penetrate the cantilever body to form a traction hook groove for inserting the rubber chain. After being guided by the cantilever body, the rubber chain is embedded into the traction hook groove from the slit thereon to limit the rubber chain.

[0012] Furthermore, a plurality of inverted teeth are equidistantly arranged on the inner ring side of the traction hook groove, and the rubber chain is stopped by the inverted teeth after passing through the traction hook; wherein the cross section of the inverted teeth is an inclined trapezoid, and the inverted teeth are inclined at 30° to the normal plane of the traction hook groove.

[0013] Furthermore, two cantilever bodies are symmetrically provided.

[0014] Furthermore, the retainer, lingual buckle and buccal tube are bonded to the teeth using a light-curing orthodontic adhesive; wherein the lingual buckle is bonded to the inner side of the teeth of the mandibular dentition; and the buccal tube is bonded to the outer side of the teeth of the maxillary dentition.

[0015] Furthermore, the palatal connector is S-shaped.

[0016] In a second aspect of the present invention, a method for manufacturing a cantilever appliance for posterior tooth occlusion is provided, the steps of which are as follows:

[0017] S1. Obtain the mucosal data of the patient's teeth, gums, maxillary palatal mucosa, mandibular lingual to mouth floor, and buccal to buccal mucosa transition through a digital intraoral scanner;

[0018] S2, import the data in S1 into 3shape design software in STL format, and design the three components of the cantilever appliance: the retainer, the connector, and the cantilever body;

[0019] S3. A traction hole is reserved on the cantilever unit in S2 for fixing the rubber chain;

[0020] S4, generating STL format 3D data from the model designed in S3 and printing it using a 3D metal printer to make a physical entity;

[0021] S5. Grind and polish the product in S4 to obtain a wearable cantilever appliance.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention digitally designs and customizes cantilever appliances for patients according to the differences in the degree of locking of the posterior teeth in the patient's mouth, and then uses 3D printing technology to print the personalized cantilever upper / lower jaw appliances as a whole, thereby improving the integration of the appliances. By avoiding the production process of plaster embedding and silver soldering traction hooks in the appliances manufactured by traditional methods, welding points are avoided on them, so that the foreign body sensation inside the oral cavity of patients can be reduced during daily wearing, and the problem of easy desoldering of welding points in existing appliances is solved.

[0024] 2. The present invention achieves a fixed connection between the cantilever body and the rubber chain by fixing the rubber chain on the traction hole, and avoids direct contact between the rubber chain and the wall of the traction hole by arranging a flexible ring pad inside the traction hole. On the one hand, it can avoid the burrs that may appear on the rigid cantilever body and aggravate the wear of the rubber chain; on the other hand, it can utilize the limiting effect of the upper limit protrusion on the flexible ring pad to adjust the different fixed angles of the rubber chain in the traction hole in different correction stages of the affected tooth to adapt to the angle changes in the correction growth process of the affected tooth; on the other hand, the provision of the flexible ring pad changes the rigid contact between the rubber chain and the cantilever body into elastic contact, which is beneficial to increase the preload force generated by the rubber chain and improves the reliability of the connection between the rubber chain and the cantilever body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0026] Figure 1 A three-dimensional structural diagram of a cantilever appliance for maxillary molars is provided for the present invention;

[0027] Figure 2 for Figure 1 A simplified structural diagram of the middle cantilever body being arranged on both sides of the tooth row;

[0028] Figure 3 for Figure 1 Bottom view of

[0029] Figure 4 for Figure 1 A front view of

[0030] Figure 5 A three-dimensional structural diagram of a cantilever appliance for mandibular molars is provided for the present invention;

[0031] Figure 6 for Figure 5 A top view from another orientation;

[0032] Figure 7 A broken view of a cantilever body in one embodiment of the present invention;

[0033] Figure 8 for Figure 7 A cross-sectional view of

[0034] Fig. 9 A schematic diagram of the structure of a traction hole on a cantilever body in an embodiment provided by the present invention;

[0035] Fig.10 A schematic structural diagram of a cantilever body in an embodiment of the present invention;

[0036] Fig.11 for Fig.10 AA section view and its partial view;

[0037] Fig.12 A schematic diagram of the structure of a cantilever appliance in one embodiment of the present invention;

[0038] Fig.13 for Fig.12 Enlarged view of middle Ⅰ.

[0039] The numbers in the figure represent the following:

[0040] 10. Retainer; 20. Connector; 21. Tooth-side connector; 22. Palatal-side connector; 30. Cantilever body; 31. Lingual buckle; 32. Rubber chain; 33. Buccal tube; 34. Traction hole; 341. Flexible ring pad; 342. Limiting protrusion; 343. Limiting groove; 344. Supporting protrusion; 345. Limiting hole; 35. Traction hook groove; 351. Inverted tooth. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1-6 As shown, the present invention provides a cantilevered appliance for posterior teeth occlusion, comprising:

[0043] The retainer 10 is a ring-shaped sleeve bonded to the circumferential surrounding part of the tooth, and at least two retainers 10 are symmetrically arranged in the direction of tooth arrangement;

[0044] The connector 20 includes a tooth-side connector 21 and a palatal connector 22. The tooth-side connector 21 is connected between the retainers 10 on the same side, and the tooth-side connector 21 is close to the inner side of the dentition and surrounds part of the axial surface of the tooth; the palatal connector 22 is connected between the retainers 10 on the opposite side, and the palatal connector 22 is arc-shaped and close to the palatal mucosa; the palatal connector 22 is S-shaped;

[0045] The cantilever body 30 is formed by extending the retainer 10 / connector 20 toward the deep of the dentition, and the cantilever body 30 is arranged on the buccal side / palatal side of the tooth;

[0046] The cantilever body 30 is arranged close to the outer side of the periodontium of the mandibular dentition, the cantilever body 30 is formed on the retainer 10 and extends deep into the dentition, and the cantilever body 30 extends along the tangent direction of the retainer 10; a lingual buckle 31 opposite to the cantilever body 30 is arranged on the inner side of the mandibular dentition teeth, and the cantilever body 30 is connected to the lingual buckle 31 by a rubber chain 32 inserted and fixed therein and tensioned, so that the tensioning force of the rubber chain 32 is transmitted through the retainer 10 and the connector 2 0 acts on the affected tooth for correction; or, the cantilever body 30 is arranged close to the inner side of the periodontium of the maxillary dentition, the cantilever body 30 is formed at the end of the connector 20 and extends deep into the dentition; a buccal tube 33 opposite to the cantilever body 30 is arranged on the outer side of the teeth of the maxillary dentition, and the cantilever body 30 is connected to the buccal tube 33 by a rubber chain 32 inserted and fixed therein and tensioned, so that the tensioning force of the rubber chain 32 acts on the affected tooth through the retainer 10 and the connector 20.

[0047] The cantilever appliance for posterior teeth locking provided by the present invention digitally designs and customizes the cantilever appliance for the patient according to the difference in the degree of posterior teeth locking in the patient's mouth, and then uses 3D printing technology to print the personalized cantilever upper / lower jaw appliances as a whole, thereby improving the integration of the appliance. By avoiding the production process of plaster embedding and silver soldering traction hooks in the appliance manufactured by traditional methods, welding points are avoided on it, so that the foreign body sensation inside the oral cavity of the patient can be reduced during daily wearing, and the problem of easy desoldering of welding points in the existing appliance is solved.

[0048] It should be noted that since the correction process of the posterior teeth orthodontic / reverse occlusion is basically the same, the present invention uses the correction process of the posterior teeth orthodontic occlusion as an example. For the correction of reverse occlusion, it is only necessary to swap the positions of the upper and lower teeth orthodontic appliances, and the process will not be repeated. Specifically, in the cantilever orthodontic appliance provided by the present invention, if Figure 1 , 3 The maxillary appliance shown is specially used in the maxillary space of the human oral cavity, and it is preferably Figure 2The wearing method on the left side, that is, a cantilever body 30 is set on the inner side of the dentition, and a buccal tube 33 is set on the outer side of the dentition, and a rubber chain 32 is pulled between the cantilever body 30 and the buccal tube 33, so that the braces as a whole can generate prestress for correcting the affected teeth through the force exerted on the end of the cantilever body 30, and correct the affected teeth that were originally tilted toward the buccal direction inside the oral cavity to a position where they can occlude with the lower teeth.

[0049] And for the mandibular appliance in the present invention, as Figure 5-6 As shown, it is used in the mandibular space of the human oral cavity, and it is preferably used Figure 2 The wearing method on the right side, that is, a cantilever body 30 is provided on the outside of the dentition, a lingual buckle 31 is provided on the inside of the dentition, and a rubber chain 32 is pulled between the cantilever body 30 and the lingual buckle 31, so that the whole appliance generates prestress for the correction of the affected teeth through the force exerted on the end of the cantilever body 30, and the affected teeth originally tilted toward the tongue of the oral cavity are corrected to a vertical position that can occlude with the upper teeth. Through the coordinated cooperation between the cantilever upper / mandibular appliances, the purpose of correcting the locking state of the patient's maxillary and mandibular teeth in the oral cavity is achieved, so that they can achieve a better occlusal state and restore normal occlusal function. It should be noted in this embodiment that a protrusion can be provided at the end of the cantilever body 30 to be fixedly connected through the buckle hole on the rubber chain 32.

[0050] In this embodiment, the inwardly retracted outer edge of the retainer 10 can generally surround the top edge of the tooth, while making the contact surface between the inner side of the retainer 10 and the tooth as wide as possible, so as to facilitate the subsequent bonding of it to the tooth using glass ion adhesive, so that the retainer 10 can be used to fix and support the braces as a whole on the dentition, thereby improving the stability of the braces when worn.

[0051] In the above embodiment provided by the present invention, one end of the rubber chain 32 needs to be fixedly connected to the cantilever body 30, and this process may be performed in advance outside the oral cavity or performed inside the oral cavity. After the two are fixedly connected, during the patient's tooth occlusion, the upper and lower teeth squeeze the rubber chain 32 and continuously generate friction, which may cause the position of the rubber chain 32 to shift, causing the tension direction of the rubber chain 32 to change, affecting its correction of the locked teeth; on the other hand, as the braces continue to apply force to the patient's locked teeth, the position of the corrected teeth gradually changes in different treatment stages, resulting in the rubber chain 32 being unable to adapt to the position changes of the teeth during the correction process when the position of the rubber chain 32 on the cantilever body 30 remains fixed.

[0052] In order to solve the above problems, Figure 7As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, a through traction hole 34 is opened on the cantilever body 30 for inserting the rubber chain 32, and the end of the rubber chain 32 forms a loop knot and is fixed to the traction hole 34; wherein, a flexible ring pad 341 is provided in the traction hole 34 and surrounded by its inner ring side, and a plurality of limiting protrusions 342 are arranged at equal intervals on the inner ring side of the flexible ring pad 341, and the rubber chain 32 is limited between adjacent limiting protrusions 342 after passing through the flexible ring pad 341.

[0053] In this embodiment, the aperture of the traction hole 34 is selected in the range of 3mm-5mm according to the design width of the cantilever body 30. A wider cantilever body 30 should have a larger aperture, and vice versa. By fixing the rubber chain 32 to the traction hole 34, a fixed connection between the cantilever body 30 and the rubber chain 32 is achieved. Furthermore, by setting a flexible ring pad 341 in the traction hole 34 to avoid direct contact between the rubber chain 32 and the wall of the traction hole 34, on the one hand, it can prevent the burrs that may appear on the rigid cantilever body 30 from aggravating the wear of the rubber chain 32; on the other hand, the limiting effect of the upper limit protrusion 342 of the flexible ring pad 341 can be used to adjust the different fixed angles of the rubber chain 32 in the traction hole 34 during different correction stages of the affected tooth to adapt to the angle changes during the correction growth process of the affected tooth; on the other hand, the setting of the flexible ring pad 341 changes the rigid contact between the rubber chain 32 and the cantilever body 30 into elastic contact, which is beneficial to increase the preload force generated by the rubber chain 32. It should be noted in this embodiment that, Figure 7-8 As shown, the axial cross section of the flexible ring pad 341 is in the shape of an I, and is sleeved in the traction hole 34 to be fixed.

[0054] In the above embodiment, the rubber chain 32 is difficult to be pre-set in the traction hole 34 at a certain angle, and the rubber chain 32 is easy to slip out of the middle area between adjacent limiting protrusions 342, so that the rubber chain 32 loses its pre-tightening force.

[0055] To solve the above problems, please continue to refer to Figure 7 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, the middle area of ​​adjacent limiting protrusions 342 and the inner ring wall of the flexible ring pad 341 enclose a semi-elliptical structure with a gap on the inner side; wherein, the end portions of the limiting protrusions 342 extend in both directions along the circumference of the flexible ring pad 341 to limit the gap between adjacent limiting protrusions 342; a limiting groove 343 is provided on the flexible ring pad 341 for embedding the rubber chain 32 to limit its circumferential slippage, and the limiting groove 343 is opened in the middle of the middle area of ​​the adjacent limiting protrusions 342.

[0056] In this embodiment, by designing the structural shape of the limiting protrusions 342, adjacent limiting protrusions 342 can be enclosed to form a semi-elliptical structure, which can reduce the probability of the rubber chain 32 coming out; at the same time, by providing a limiting groove 343 for the rubber chain 32 to be embedded in the middle of the space generated by adjacent limiting protrusions 342, not only can the rubber chain 32 be pre-set on the cantilever body 30, avoiding the problem that medical staff need to clamp the end of the rubber chain 32 in the patient's mouth to enter the traction hole 34, which may cause operation failure due to its great difficulty; and the position of the rubber chain 32 in the area between adjacent limiting protrusions 342 can be kept relatively unchanged, thereby reducing the problem of slippage and dislocation of the rubber chain 32 during the fixing and tensioning process.

[0057] In the above embodiment, since the flexible ring pad 341 and the traction hole 34 are in an overfit state, circumferential slip may occur between them due to the pulling of the rubber chain 32, affecting the direction of the force applied by the rubber chain 32 to the cantilever body 30.

[0058] In order to solve the above problems, Figure 8-9 As shown, in another embodiment provided by the present invention which is different from the above-mentioned embodiment, a support protrusion 344 is provided on the inner ring side of the traction hole 34. After the flexible ring pad 341 is inserted into the traction hole 34, the part of the support protrusion 344 protruding from the inner ring side of the flexible ring pad 341 forms a limit for the rubber chain 32; wherein, the flexible ring pad 341 is provided with limit holes 345 corresponding to the positions of the support protrusions 344 at equal intervals. After the flexible ring pad 341 is inserted into the traction hole 34, each support protrusion 344 passes through the limit hole 345 corresponding to its position, and the middle area of ​​adjacent support protrusions 344 forms a limit for the rubber chain 32.

[0059] In this embodiment, by sleeve-mounting the flexible ring pad 341 with the limiting hole 345 on the supporting protrusion 344, not only can the two be circumferentially fixed to avoid circumferential slippage due to the pulling of the rubber chain 32, but also the end of the supporting protrusion 344 protruding relative to the flexible ring pad 341 can be used to form a limit to limit the position of the rubber chain 32. Preferably, the adjacent ends of the adjacent supporting protrusions 344 extend toward each other and close together, thereby forming a semi-elliptical cross-sectional area to prevent the rubber chain 32 from slipping out of the area between the adjacent supporting protrusions 344.

[0060] In the above embodiment, after the orthodontic appliance is placed in the patient's oral cavity, the medical staff needs to clamp the end of the rubber chain 32 and insert it into the traction hole 34 with a smaller diameter, which is not conducive to the successful operation.

[0061] In order to solve the above problems, Figure 10-11As shown, a slit is opened on one side of the traction hole 34 to penetrate the cantilever body 30 to form a traction hook groove 35 for inserting the rubber chain 32. After being guided by the cantilever body 30, the rubber chain 32 is embedded into the traction hook groove 35 from the slit thereon to limit the rubber chain 32.

[0062] In this embodiment, the traction hook groove is provided to simplify the insertion process of the rubber chain 32 and improve the efficiency of the medical staff in tightening the rubber chain 32 .

[0063] In order to ensure that the rubber chain 32 is stably connected in the traction hook groove 35, please continue to refer to Fig.11 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, a plurality of inverted teeth 351 are equidistantly provided on the inner ring side of the traction hook groove 35 in the circumferential direction, and the rubber chain 32 is stopped by the inverted teeth 351 after passing through the traction hook 35; wherein, the cross-section of the inverted teeth 351 is an inclined trapezoid, and the inverted teeth 351 are inclined at 30° to the normal plane of the traction hook groove 35.

[0064] In this embodiment, by providing the inverted teeth 351 in the traction hook groove 35, the rubber chain 32 can be fixed relative to the traction hook groove 35 to prevent the two from slipping. It should be noted that the end of the inverted teeth 351 should be blunted to avoid piercing the rubber chain 32 or accelerating its wear.

[0065] In order to be able to correct the teeth on both sides of the patient's gums separately, Figure 3 As shown, two cantilever bodies 30 are symmetrically provided.

[0066] In order to fix the lingual buckle 31 and the buccal tube 33 on one side of the patient's teeth to provide a fixed fulcrum for the rubber chain 32, please continue to refer to Figure 2 As shown, the lingual buckle 31 and the buccal tube 33 are bonded to the teeth using a light-curing orthodontic adhesive; wherein the lingual buckle 31 is bonded to the inner side of the teeth of the mandibular dentition; and the buccal tube 33 is bonded to the outer side of the teeth of the maxillary dentition.

[0067] The present invention also provides a method for manufacturing a cantilever appliance for posterior tooth occlusion, the steps of which are as follows:

[0068] S1. Obtain the mucosal data of the patient's teeth, gums, maxillary palatal mucosa, mandibular lingual to mouth floor, and buccal to buccal mucosa transition through a digital intraoral scanner;

[0069] S2, import the data in S1 into 3shape design software in STL format, and design the three components of the cantilever appliance: the retainer, the connector, and the cantilever body;

[0070] S3. A traction hole is reserved on the cantilever unit in S2 for fixing the rubber chain;

[0071] S4, generating STL format 3D data from the model designed in S3 and printing it using a 3D metal printer to make a physical entity;

[0072] S5. Grind and polish the product in S4 to obtain a wearable cantilever appliance.

[0073] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A cantilever orthodontic appliance for posterior teeth occlusion, characterized in that: include: A retainer (10) is annularly sleeved and bonded to the circumferentially surrounding portion of the tooth top, and at least two retainers (10) are symmetrically arranged in the direction of tooth arrangement; A connector (20), the connector (20) comprising a tooth-side connector (21) and a palatal connector (22), the tooth-side connector (21) being connected between the retainers (10) located on the same side, the tooth-side connector (21) being close to the inner side of the dentition and surrounding a portion of the axial surface of the teeth; the palatal connector (22) being connected between the retainers (10) located on the opposite side, the palatal connector (22) being arc-shaped and close to the palatal mucosa; A cantilever body (30), wherein the cantilever body (30) is formed by extending the retainer (10) / connector (20) toward the depth of the dentition, and the cantilever body (30) is arranged on the buccal side / palatal side of the tooth; The cantilever body (30) is arranged close to the inner side of the periodontium of the maxillary dentition, and the cantilever body (30) is formed at the end of the connector (20) and extends deep into the dentition; a buccal tube (33) opposite to the cantilever body (30) is arranged on the outer side of the teeth of the maxillary dentition, and the cantilever body (30) is connected to the buccal tube (33) and tensioned by a rubber chain (32) inserted and fixed therein, so that the tensioning force of the rubber chain (32) acts on the affected tooth through the retainer (10) and the connector (20); Alternatively, the cantilever body (30) is arranged close to the outer side of the periodontium of the mandibular dentition, the cantilever body (30) is formed on the retainer (10) and extends deep into the dentition, and the cantilever body (30) extends along the tangent direction of the retainer (10); a lingual buckle (31) opposite to the position of the cantilever body (30) is provided on the inner side of the teeth of the mandibular dentition, and the cantilever body (30) is connected to the lingual buckle (31) and tensioned by a rubber chain (32) inserted and fixed therein, so that the tensioning force of the rubber chain (32) acts on the affected tooth through the retainer (10) and the connector (20) for correction.

2. A cantilever appliance for posterior teeth occlusion according to claim 1, characterized in that: The cantilever body (30) is provided with a through traction hole (34) for inserting the rubber chain (32), and the end of the rubber chain (32) is formed into a loop and fixed to the traction hole (34); The traction hole (34) is provided with a flexible ring pad (341) surrounding the inner ring side thereof, and a plurality of limiting protrusions (342) are arranged at equal intervals on the inner ring side of the flexible ring pad (341). After the rubber chain (32) passes through the flexible ring pad (341), it is limited between adjacent limiting protrusions (342).

3. A cantilever appliance for posterior teeth occlusion according to claim 2, characterized in that: The middle area of ​​the adjacent limiting protrusions (342) and the inner ring wall of the flexible ring pad (341) enclose a semi-elliptical structure with a slit on the inner side; Wherein, the end portions of the limiting protrusions (342) extend bidirectionally along the circumference of the flexible ring pad (341) to limit the gap between adjacent limiting protrusions (342); The flexible ring pad (341) is provided with a limiting groove (343) for embedding the rubber chain (32) to limit its circumferential sliding, and the limiting groove (343) is opened in the middle of the middle area adjacent to the limiting protrusion (342).

4. A cantilever appliance for posterior teeth occlusion according to claim 2, characterized in that: A supporting protrusion (344) is provided on the inner ring side of the traction hole (34), and after the flexible ring pad (341) is inserted into the traction hole (34), the portion of the supporting protrusion (344) protruding from the inner ring side of the flexible ring pad (341) forms a limit for the rubber chain (32); The flexible ring pad (341) is provided with limiting holes (345) at equal intervals corresponding to the positions of the supporting protrusions (344). After the flexible ring pad (341) is inserted into the traction hole (34), each supporting protrusion (344) passes through the limiting hole (345) corresponding to its position, and the middle area between adjacent supporting protrusions (344) forms a limit for the rubber chain (32).

5. The cantilever appliance for posterior teeth occlusion according to claim 1, characterized in that: A slit is provided on one side of the traction hole (34) and penetrates through the cantilever body (30) to form a traction hook groove (35) for inserting the rubber chain (32); the rubber chain (32) is guided by the cantilever body (30) and then embedded into the traction hook groove (35) from the slit thereon, so as to limit the rubber chain (32).

6. A cantilever appliance for posterior teeth occlusion according to claim 5, characterized in that: A plurality of inverted teeth (351) are equidistantly arranged on the inner ring side of the traction hook groove (35) in the circumferential direction, and the rubber chain (32) is stopped by the inverted teeth (351) after passing through the traction hook (35); The cross section of the inverted tooth (351) is an inclined trapezoid, and the inverted tooth (351) is inclined at 30° to the normal plane of the traction hook groove (35).

7. A cantilever appliance for posterior teeth occlusion according to any one of claims 2 to 6, characterized in that: Two cantilever bodies (30) are symmetrically arranged.

8. A cantilever appliance for posterior teeth occlusion according to claim 7, characterized in that: The lingual buckle (31) and the buccal tube (33) are respectively bonded to the teeth using a light-curing orthodontic adhesive; Wherein, the lingual buckle (31) is bonded to the lingual side of the mandibular lingually inclined teeth; and the buccal tube (33) is bonded to the buccal side of the maxillary buccally inclined teeth.

9. The cantilever appliance for posterior teeth occlusion according to claim 8, characterized in that: The palatal connector (22) is curved in an S shape.

10. A method for manufacturing a cantilever appliance for posterior teeth occlusion as claimed in claim 9, the steps of which are as follows: S1. Obtain the mucosal data of the patient's teeth, gums, maxillary palatal mucosa, mandibular lingual to mouth floor, and buccal to buccal mucosa transition through a digital intraoral scanner; S2, import the data in S1 into 3shape design software in STL format, and design the three components of the cantilever appliance: the retainer, the connector, and the cantilever body; S3. A traction hole is reserved on the cantilever unit in S2 for fixing the rubber chain; S4, generating STL format 3D data from the model designed in S3 and printing it using a 3D metal printer to make a physical entity; S5. Grind and polish the product in S4 to obtain a wearable cantilever appliance.

Images