Shell-shaped dental instrument for being worn on upper jaw

Abstract

The embodiment of the utility model provides a shell-shaped dental instrument worn on an upper jaw, the shell-shaped dental instrument comprises a shell-shaped body with a plurality of tooth accommodating cavities and a palate bearing part integrally formed with the shell-shaped body, and the plurality of tooth accommodating cavities at least wrap teeth in a front tooth area; the palate bearing part is connected with the lingual side edge of the tooth containing cavity corresponding to the teeth in the anterior tooth area, a traction part used for hanging a traction piece is arranged on the lingual side face of the palate bearing part, the traction part is arranged in the horizontal direction, and the traction piece is connected with the palate bearing part. A first containing groove and a second containing groove which are used for containing the traction piece are formed in the two ends, in the horizontal direction, of the traction part respectively. The arrangement of the palate bearing part effectively avoids the problem that anchorage nails need to be hit on the palate, a sufficient arrangement area is provided for the traction part, and the correction effect of a patient is guaranteed on the premise that the comfort of the patient in the correction process is improved.

Description

Technical Field

[0001] This application relates to the field of orthodontic technology, and in particular to a shell-shaped dental instrument for wearing on the maxilla. Background Technology

[0002] Shell-shaped orthodontic appliances are a type of orthodontic device made of safe, elastic, transparent polymer material. They have the advantages of being completely invisible during the orthodontic process, aesthetically pleasing, easy to operate, and convenient for oral cleaning. Moreover, due to their transparent and aesthetically pleasing characteristics, the orthodontic process is completed almost imperceptibly to others, and they have gradually become the first choice for orthodontic patients.

[0003] However, compared to traditional fixed orthodontic treatment, shell-shaped orthodontic appliances are made of soft materials and lack rigidity. For cases requiring greater orthodontic force, shell-shaped orthodontic appliances are significantly less efficient than traditional fixed orthodontic appliances, greatly limiting their applicability. In existing technologies, for example, when anterior tooth retraction is required in cases involving tooth extraction, to avoid the inability to achieve anterior tooth retraction when using shell-shaped orthodontic appliances alone, and the problem of mesial tilting of the anterior teeth due to insufficient posterior anchorage, Chinese patent CN202022835992.3 proposes a solution using shell-shaped orthodontic appliances in conjunction with anchorage screws to address the aforementioned technical problems. However, in this solution, the anchorage screws need to be inserted into the hard palate. This treatment method not only causes significant pain for the patient, but also easily leads to food debris accumulation around the anchorage screws, affecting the orthodontic effect and increasing the risk of inflammation of the wound around the anchorage screws.

[0004] Therefore, structural improvements to invisible aligners are of great significance in order to both apply greater orthodontic forces to the dentition and ensure patient comfort during treatment. Utility Model Content

[0005] The purpose of this application is to provide a shell-shaped dental instrument for wearing on the maxilla that effectively solves the above-mentioned problems. It can solve the problem that in the prior art, it is impossible to apply a large traction force using only a shell-shaped dental appliance, and it is necessary to provide traction by setting an additional device in the patient's mouth. The shell-shaped dental instrument in this application expands the clinical applicability of shell-shaped orthodontic appliances and ensures the comfort of patients during the orthodontic process.

[0006] To achieve the above objectives, embodiments of this application provide a shell-shaped dental instrument for wearing on the maxilla, comprising a shell-shaped body having multiple tooth receiving cavities and a palatal support portion integrally formed with the shell-shaped body. The multiple tooth receiving cavities at least cover the teeth in the anterior region. The palatal support portion is connected to the lingual edge of the tooth receiving cavity corresponding to the teeth in the anterior region. The lingual side of the palatal support portion is provided with a traction portion for suspending a traction member. The traction portion is arranged horizontally, wherein the traction portion has a first receiving groove and a second receiving groove for accommodating the traction member at its two ends in the horizontal direction.

[0007] Preferably, the traction part is a cavity structure formed by a portion of the surface of the palatal bearing part protruding downwards towards the mandible, and the first accommodating groove and the second accommodating groove are respectively disposed on the side surfaces of the two ends of the traction part.

[0008] Preferably, the first receiving groove and the second receiving groove are formed by recessing a portion of the side surface of the traction portion into the interior of the traction portion.

[0009] Preferably, the first receiving groove and the second receiving groove are open structures that connect the inside of the traction part with the outside.

[0010] Preferably, the first side surface of the traction part adjacent to the anterior tooth area is provided with a third receiving groove for accommodating the traction member. The third receiving groove is connected to the first receiving groove and the second receiving groove respectively. The third receiving groove is a groove formed by the indentation of part of the first side surface or an opening structure formed on the first side surface.

[0011] Preferably, the second side surface of the traction part away from the anterior tooth area is provided with a fourth receiving groove for accommodating the traction member. The fourth receiving groove is connected to the first receiving groove and the second receiving groove respectively. The fourth receiving groove is a groove formed by the indentation of part of the second side surface or an opening structure formed on the second side surface.

[0012] Preferably, the first side surface of the traction portion adjacent to the anterior tooth region and / or the second side surface of the traction portion away from the anterior tooth region are provided with a reinforcing structure, wherein the reinforcing structure extends from the side adjacent to the palatal support portion to the side away from the palatal support portion.

[0013] Preferably, when the first side surface of the traction part adjacent to the anterior tooth area and the second side surface of the traction part away from the anterior tooth area are provided with reinforcing structures, the reinforcing structures are continuously provided on the first side surface and the second side surface.

[0014] Preferably, the traction part is a solid structure formed by a portion of the surface of the palatal bearing part protruding downwards towards the jaw, and the first receiving groove and the second receiving groove are respectively grooves provided on the side surfaces of the two ends of the traction part.

[0015] Preferably, the entire traction portion is bent away from the anterior tooth region.

[0016] Preferably, the overall curvature of the traction portion is consistent with the curvature of the dental arch at the corresponding location in the anterior tooth region.

[0017] Preferably, the width of any cross-section of the traction portion in the lip-tongue direction gradually decreases from the end adjacent to the palatal support portion to the end away from the palatal support portion.

[0018] Preferably, the cross-section is semi-circular, elliptical, or shark fin-shaped.

[0019] Preferably, the protrusion height of the traction part in the mandibular direction exceeds the incisal edge of the anterior teeth.

[0020] Preferably, the length of the traction part in the horizontal direction is greater than the length of the three teeth in the anterior region at the corresponding position in the horizontal direction.

[0021] Preferably, the traction part is fixedly installed on the tongue side surface of the palatal bearing part, and the mechanical strength of the traction part is greater than the mechanical strength of the shell-shaped body.

[0022] This utility model provides a shell-shaped dental instrument for wearing on the upper jaw, which, compared with the prior art:

[0023] The shell-shaped dental instrument used in this application for wearing on the maxilla includes a shell-shaped body with multiple tooth-accommodating cavities and a palatal support portion integrally formed with the shell-shaped body and positioned in the palatal region. The lingual surface of the palatal support portion has a traction portion facing the mandible. The design of the palatal support portion effectively avoids the need for anchorage screws in the palate, providing ample space for the traction portion and improving patient comfort during orthodontic treatment. Furthermore, the palatal support portion and the shell-shaped body encasing the teeth are integrally formed; this design allows the orthodontic force to be more fully transmitted through the palatal support portion to the teeth encased in the shell-shaped body, resulting in better orthodontic outcomes.

[0024] Furthermore, the horizontally oriented traction unit can withstand greater traction force and provide greater anchorage, enabling the treatment of moving multiple teeth in the anterior region as a whole using only a shell-shaped orthodontic appliance. Additionally, the traction unit has a first receiving slot and a second receiving slot at its two horizontal ends to accommodate the traction component. These slots can suspend the traction component separately or together, thus achieving different traction modes. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 This is a schematic diagram of the shell-shaped dental instrument in Embodiment 1 of this application;

[0027] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0028] Figure 3 This is a cross-sectional schematic diagram of the shell-shaped dental instrument in Example 1 during wear along the sagittal plane;

[0029] Figure 4 This is a schematic diagram of the structure of a shell-shaped dental instrument in the wearing state according to Embodiment 1 of this application;

[0030] Figure 5 This is a schematic diagram of another shell-shaped dental instrument in Embodiment 1 of this application;

[0031] Figure 6 yes Figure 5 A schematic diagram of a shell-shaped dental instrument in the wearing state;

[0032] Figure 7 This is a schematic diagram of another shell-shaped dental instrument in Embodiment 1 of this application;

[0033] Figure 8 This is a schematic diagram of the structure of a traction unit in Embodiment 1 of this application;

[0034] Figure 9 This is a schematic diagram of another shell-shaped dental instrument in Embodiment 1 of this application;

[0035] Figure 10 yes Figure 9 A magnified view of a portion of region B in the middle;

[0036] Figure 11 This is a schematic diagram of the structure of the traction unit with a third receiving groove in Embodiment 1 of this application;

[0037] Figure 12 This is a schematic diagram of another shell-shaped dental instrument in Embodiment 1 of this application;

[0038] Figure 13 yes Figure 12 A magnified view of a portion of region C in the middle;

[0039] Figure 14 This is a schematic diagram of the structure of the fourth receiving groove provided on the traction part in Embodiment 1 of this application;

[0040] Figure 15 This is a schematic diagram of another traction unit in Embodiment 1 of this application;

[0041] Figure 16 This is a schematic diagram of another traction unit in Embodiment 1 of this application;

[0042] Figure 17 This is a cross-sectional schematic diagram of a traction unit in Embodiment 1 of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to enable readers to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0044] The term "posterior region" mentioned in the various embodiments of this application is defined according to the classification of teeth in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. It includes premolars and molars, teeth marked as 4-8 using the FDI notation, and teeth marked as 1-3 using the FDI notation for the anterior region. Teeth in the anterior region include central incisors, lateral incisors, and canines.

[0045] Shell-type orthodontic appliances are invisible and aesthetically pleasing mechanical devices for teeth straightening, designed and manufactured using computer-aided 3D modeling. They are typically worn inside the mouth and are made of polymer materials such as TPU, PETG, or a combination of both. These appliances exert forces that cause changes in the malocclusion of the jawbone, misaligned teeth, and periodontal tissues, promoting normal dentofacial growth and development. Shell-type orthodontic appliances utilize biomechanical principles to correct malocclusion. Through a system consisting of a series of shell-shaped appliances, gentle and sustained biomechanical forces are applied to gradually move the teeth, restoring them to their proper positions and aligning them correctly. During treatment, additional attachments or unique structures are often incorporated into the shell-type appliances to apply extra corrective forces to the teeth.

[0046] However, due to the soft material and insufficient rigidity of shell-shaped orthodontic appliances, they cannot effectively apply significant orthodontic forces when needed. This is especially true in cases requiring tooth extraction and overall anterior tooth retraction; using only shell-shaped appliances can easily lead to posterior anchorage loss and mesial tilting of the anterior teeth. Therefore, existing technologies often incorporate attachments from fixed orthodontic treatments to assist in applying force. However, this design completely negates the advantages of shell-shaped appliances, such as their invisibility, comfort, and ease of oral hygiene. This application provides a solution to these technical problems, achieving greater traction force while fully preserving the advantages of shell-shaped appliances.

[0047] The various embodiments of this application will now be described with reference to the accompanying drawings.

[0048] Example 1

[0049] refer to Figure 1 and Figure 2 As shown, an embodiment of this application provides a shell-shaped dental instrument for wearing on the maxilla, comprising a shell-shaped body 1 having multiple tooth receiving cavities 11 and a palatal support portion 12 integrally formed with the shell-shaped body 1. The multiple tooth receiving cavities 11 at least cover the teeth in the anterior region, preferably all the teeth in the anterior region. The palatal support portion 12 is connected to the lingual edge of the tooth receiving cavity 11 corresponding to the teeth in the anterior region. The overall shape of the palatal support portion 12 can be a plane parallel to a horizontal plane or a plane parallel to the maxillary occlusal plane, or, more preferably, refer to... Figure 3 As shown, the overall shape of the palatal support 12 can be an arc shape consistent with the shape of the hard palate, allowing it to fit snugly against the patient's hard palate or maintain a certain distance when worn. The arc shape of the palatal support 12 effectively improves its resistance to deformation in both the sagittal and horizontal directions. A traction part 13 for suspending traction components is provided on the lingual side of the palatal support 12. The traction part 13 is arranged horizontally. It should be noted that, in various embodiments of this application, "horizontally arranged" means that the long axis of the traction part 13 is parallel to the horizontal direction, or the angle between them is less than 90°; both of these situations are within the scope of protection of this application. The traction part 13 has a first receiving groove 131 and a second receiving groove 132 at its two ends in the horizontal direction, respectively, for accommodating traction components. The traction components in various embodiments of this application generally refer to rubber bands of different specifications commonly used in orthodontics. During use, the traction components can be simultaneously suspended on the first receiving groove 131 and the second receiving groove 132, or different traction components can be suspended on the first receiving groove 131 and the second receiving groove 132 respectively. refer to Figure 4As shown, when the traction member 3 is suspended in the first receiving slot 131 and the second receiving slot 132 respectively, the other end of the traction member 3 can be suspended on the lingual clip 2 bonded to the buccal side of the tooth in the posterior tooth region, using the posterior tooth as anchorage to retract the anterior tooth. In this case, refer to Figure 5 and Figure 6 As shown, the multiple tooth-receiving cavities 11 of the shell-shaped body 1 can only cover the teeth in the anterior region that need to be retracted. Of course, the shell-shaped body 1 can also cover the entire maxillary dentition, with the lingual clip 2 directly attached to the buccal surface of the posterior teeth, and the shell-shaped body 1 making cuts to avoid the position of the lingual clip 2. Furthermore, in order to further confine the traction member 3 within the first receiving groove 131 and the second receiving groove 132, refer to... Figure 7 As shown, the traction part 13 is bent as a whole, and the first receiving groove 131 and the second receiving groove 132 are oriented toward the teeth in the anterior tooth area. This arrangement can effectively prevent the traction member 3 from falling out of the first receiving groove 131 and the second receiving groove 132.

[0050] The palatal support portion 12 in the various embodiments of this application effectively avoids the need for anchorage screws in the palate, providing ample space for the traction portion 13 and ensuring patient comfort during orthodontic treatment. Furthermore, the palatal support portion 12 and the shell-like body 1 enclosing the teeth are integrally formed, allowing the orthodontic force to be transmitted more fully through the palatal support portion 12 to the teeth enclosed by the shell-like body 1, resulting in better orthodontic outcomes.

[0051] In this embodiment, the traction part 13 and the palatal support part 12 are integrally formed. The traction part 13 is a cavity structure formed by a portion of the surface of the palatal support part 12 protruding downwards towards the mandible. The first receiving groove 131 and the second receiving groove 132 are respectively disposed on the side surfaces of the two ends of the traction part 13. This arrangement allows the shell-shaped dental instrument for wearing on the maxilla in this embodiment to be manufactured using a hot-pressing method, eliminating the need for additional processing to fabricate the traction part 13 and reducing processing time.

[0052] In some implementations, reference Figure 8 As shown, the first receiving groove 131 and the second receiving groove 132 are formed by recesses of a portion of the side surface of the traction part 13 into the interior of the traction part 13. Here, it means that the recesses formed by the partial recesses of the side surfaces of both ends of the traction part 13 along the horizontal direction into the cavity of the traction part 13 to form grooves for hooking traction components are the first receiving groove 131 and the second receiving groove 132.

[0053] In other embodiments, the first receiving groove 131 and the second receiving groove 132 are opening structures that connect the interior and exterior of the traction part 13. This refers to the first receiving groove 131 and the second receiving groove 132 being local opening structures on the side surfaces of both ends of the traction part 13 along the horizontal direction. The opening structures of the first receiving groove 131 and the second receiving groove 132 can be achieved by importing the patient's dental model data into the system during the orthodontic appliance manufacturing process to generate a dental model for each step. The system then places a virtual traction part 13 on the corresponding dental model at each step according to the medical orthodontic plan. During placement, the bottom surface of the virtual traction part 13 contacts and fuses with the virtual palate to form a new dental model. After obtaining the shape of the orthodontic appliance by 3D printing a new dental model and pressing a diaphragm onto the solid dental model, a cutting process is used to obtain the dental receiving cavity 11 and the palatal support part 12. Local cutting is performed on the two horizontally upward-facing side surfaces of the protrusion on the palatal support part 12 to form an opening structure. Preferably, the opening structure is an arc-shaped opening to reduce the problem of stress concentration during traction, which could lead to deformation of the traction part 13. In another scenario, when using invisible orthodontic technology for treatment, and the shell-shaped body 1 requires the installation of traction units 13 in multiple steps, the patient's initial dental model data can be imported into the treatment plan design system before the orthodontic appliance is manufactured. Based on the treatment plan, a dental model for each treatment step can be generated. This also includes placing virtual traction units 13 on the dental models of each step according to the requirements of the treatment plan. The virtual traction units 13 of different steps can be placed in different positions on the palate according to different needs.

[0054] In some implementations, reference Figures 9 to 11As shown, the traction unit 13 has a third receiving groove 133 on its first side surface 133a adjacent to the anterior teeth region to accommodate the traction member. This embodiment is mainly suitable for applications where the traction member is simultaneously suspended in the first receiving groove 131 and the second receiving groove 132, and a sagittal backward traction force is applied to the teeth in the anterior teeth region by the traction unit 13. In this case, the third receiving groove 133 on the first side surface 133a adjacent to the anterior teeth region of the traction unit 13 can stably fix the traction member in the third receiving groove 133, so that the traction member does not slip on the first side surface 133a during traction, thereby ensuring the orthodontic effect. The third receiving groove 133 is connected to the first receiving groove 131 and the second receiving groove 132 on the first side surface 133a. The connection here means that the first receiving groove 131, the second receiving groove 132 and the third receiving groove 133 form a continuous receiving space. That is, when the traction member is assembled on the traction part 13, it can be completely confined within the first receiving groove 131, the second receiving groove 132 and the third receiving groove 133, and will not slide on the outer surface of the traction part 13. Specifically, the third receiving groove 133 is a recess formed by the indentation of a portion of the first side surface 133a. In this case, the first receiving groove 131 and the second receiving groove 132 can be open structures, or the first receiving groove 131 and the second receiving groove 132 can be recessed grooves formed by the indentation of a portion of the side surface of the traction part 13. Preferably, the first receiving groove 131, the second receiving groove 132, and the third receiving groove 133 are all recessed structures. This arrangement can ensure the integrity of the protruding structure of the traction part 13, thereby ensuring the rigidity of the traction part 13 during traction, improving the deformation resistance of the traction part 13, and enabling the traction component to continuously and stably provide traction force when assembled on the traction part 13. In another embodiment, the third receiving groove 133 is an open structure formed on the first side surface 133a. In this embodiment, in order to ensure that the structure of the traction part 13 does not deform and that the traction force can be applied stably, the first receiving groove 131 and the second receiving groove 132 are recessed structures instead of open structures.

[0055] In some implementations, reference Figures 12 to 14As shown, the second lateral surface 134a of the traction unit 13, away from the anterior tooth region, is provided with a fourth receiving groove 134 for accommodating the traction member. This embodiment is mainly suitable for simultaneous suspension of the traction member in the first receiving groove 131 and the second receiving groove 132. Furthermore, the traction unit 13 applies a sagittal forward traction force to the maxillary teeth. For example, it can be used for extraoral traction, where the traction member is assembled with a device such as a headgear outside the mouth to promote maxillary development. In this case, the fourth receiving groove 134 on the second lateral surface 134a of the traction unit 13, away from the anterior tooth region, can stably secure the traction member within the fourth receiving groove 134, preventing the traction member from sliding on the second lateral surface 134a during traction, thereby ensuring the orthodontic effect. The fourth receiving groove 134 is connected to the first receiving groove 131 and the second receiving groove 132 on the second side surface 134a. The connection here means that the first receiving groove 131, the second receiving groove 132 and the fourth receiving groove 134 form a continuous receiving space. That is, when the traction member is assembled on the traction part 13, it can be completely confined within the first receiving groove 131, the second receiving groove 132 and the fourth receiving groove 134, and will not slide on the outer surface of the traction part 13. Specifically, the fourth receiving groove 134 is a recess formed by the indentation of a portion of the second side surface 134a. In this case, the first receiving groove 131 and the second receiving groove 132 can be open structures, or the first receiving groove 131 and the second receiving groove 132 can be recessed grooves formed by the indentation of a portion of the side surface of the traction part 13. Preferably, the first receiving groove 131, the second receiving groove 132, and the fourth receiving groove 134 are all recessed structures. This arrangement can ensure the integrity of the protruding structure of the traction part 13, thereby ensuring the rigidity of the traction part 13 during traction, improving the deformation resistance of the traction part 13, and enabling the traction component to continuously and stably provide traction force when assembled on the traction part 13. In another embodiment, the fourth receiving groove 134 is an open structure formed on the second side surface 134a. In this embodiment, in order to ensure that the structure of the traction part 13 does not deform and that the traction force can be applied stably, the first receiving groove 131 and the second receiving groove 132 are recessed structures instead of open structures.

[0056] In some implementations, reference Figure 15As shown, since the traction part 13 is a hollow structure, to prevent deformation and collapse of the hollow structure of the traction part 13 at the contact point with the traction member when the traction force is too large, a reinforcing structure 135 is provided on the first side surface 133a adjacent to the anterior tooth area and / or the second side surface 134a away from the anterior tooth area of ​​the traction part 13. The reinforcing structure 135 is a structure that is recessed into the traction part 13 or protruded outward from the first side surface 133a and / or the second side surface 134a. Preferably, the reinforcing structure 135 is formed by the side surface of the traction part 13 being recessed inward. This arrangement increases the surface area of ​​the traction part 13, thereby improving its resistance to deformation, and the recessed formation also improves the patient's comfort in the mouth. In addition, the reinforcing structure 135 extends from the side adjacent to the palatal support part 12 to the side away from the palatal support part 12. Since the direction of the traction force is along the sagittal direction, the arrangement of the reinforcing structure 135 can be non-collinear with the direction of the traction force, thereby maximizing the deformation resistance of the traction unit 13 under sagittal traction force. Furthermore, when a third receiving groove 133 is provided on the first side surface 133a, the reinforcing structure 135 is provided on the second side surface 134a; or, when a fourth receiving groove 134 is provided on the second side surface 134a, the reinforcing structure 135 is provided on the first side surface 133a. In addition, multiple reinforcing structures 135 can be provided along their length, effectively improving the overall deformation resistance of the traction unit 13 along its length.

[0057] Further preferred options, refer to Figure 16 As shown, when the first side surface (not shown in the figure) of the traction part 13 adjacent to the anterior tooth area and the second side surface 134a of the traction part away from the anterior tooth area are provided with reinforcing structures 135, the reinforcing structures 135 are continuously provided on the first side surface (not shown in the figure) and the second side surface 134a. Compared with the single-sided provision of reinforcing structures 135, the continuous provision of reinforcing structures 135 on the first side surface and the second side surface can make the traction part 13 more effectively improve its resistance to deformation under the application of sagittal traction force. Moreover, regardless of any sagittal traction method that is forward or backward, the resistance to deformation of the traction part 13 can be improved, thereby making the traction part 13 adaptable to more traction methods.

[0058] In some embodiments, to increase the size of the traction unit 13, thereby accommodating more orthodontic needs and improving the deformation resistance of the traction unit 13, the traction unit 13 as a whole can be bent. Specifically, refer to... Figure 1As shown, the traction portion 13 is curved away from the anterior tooth region. In a preferred embodiment, the curvature of the traction portion 13 is consistent with the curvature of the dental arch at the corresponding location in the anterior tooth region. In this case, when the traction portion 13 on the shell-shaped dental instrument is used to provide sagittal backward traction force and the first receiving groove 131 and the first receiving groove 131 together restrict a traction member, it is preferable to provide a third receiving groove 133 on the first side surface 133a of the traction portion 13 (see reference). Figure 9 As shown in the diagram, this effectively limits the slippage of the traction member from the traction unit 13. A more preferred arrangement to prevent the traction member from slipping off the traction unit 13 can be achieved by using... Figure 7 The traction part 13 is configured such that the orientation of the first receiving groove 131 and the second receiving groove 132 is opposite to the direction of the traction force. For example, if the direction of the traction force is sagittal and backward, the first receiving groove 131 and the second receiving groove 132 are oriented towards the anterior tooth area. In other words, in this case, the bending direction of the traction part 13 is opposite to the bending direction of the dental arch in the anterior tooth area.

[0059] In some implementations, reference Figure 17 As shown, the width H of any cross-section 14 of the traction part 13 in the labial and lingual direction extends from the end adjacent to the palatal support part 12 to the end away from the palatal support part 12 (and...). Figure 14 The cross-section 14 of the traction part 13 gradually decreases in width (with the X-axis pointing in the same direction), and is semi-circular, elliptical, or shark fin shaped. This design of the traction part 13 not only ensures the comfort of the traction part 13 in the mouth, but also, because the traction part 13 is a hollow structure, the width of any cross-section 14 of the traction part 13 gradually decreases from the end adjacent to the palatal support part 12 to the end away from the palatal support part 12. This also provides the bending resistance of the cross-section 14, making the traction part 13 less prone to bending deformation under excessive traction force, thus providing bending stiffness of the traction part 13 and providing a corrective effect.

[0060] In some implementations, reference Figure 3As shown, the protrusion height of the traction unit 13 towards the mandible exceeds the incisal edge of the anterior teeth, but the protrusion height does not affect the occlusal relationship between the patient's upper and lower jaws. The advantage of this setting is that the first receiving groove 131 and the first receiving groove 131 can be positioned further away from the palatal bearing portion 12. This setting can reduce the impact of the traction member on the teeth it contacts during traction, whether using the traction unit 13 for intraoral or extraoral traction, and avoid undesirable movement of these teeth. For example, when using the traction unit 13 for extraoral traction, the goal is generally to apply an forward force to the entire maxilla to promote the growth and development of the maxilla. During this process, the force exerted by the traction member on the teeth in the anterior region should be avoided as much as possible during the connection between the traction member and the external device from the intraoral region. The protrusion height of the traction unit 13 towards the mandible exceeding the incisal edge of the anterior teeth and the positioning of the first receiving groove 131 and the first receiving groove 131 further away from the palatal bearing portion 12 can effectively avoid this situation.

[0061] In some implementations, reference Figure 1 As shown, the length of the traction unit 13 in the horizontal direction is greater than the length of the three teeth in the anterior region at the corresponding position in the horizontal direction. In order to truly replace the need for anchorage screws in the hard palate and to apply orthodontic force to multiple teeth in the anterior region, the traction unit 13 needs to have a large size in the horizontal direction and cover as many teeth in the anterior region as possible in the horizontal direction. That is, the traction unit 13 is located in the sagittal direction at the connection between the edge of the tooth receiving cavity 11 that covers the teeth in the anterior region and the palatal support part 12. This is so that the traction force received by the traction unit 13 can be effectively transmitted to the teeth covered by the tooth receiving cavity 11. Furthermore, in order to avoid the traction unit 13 affecting the other degrees of freedom of movement or torsional orthodontic force applied by the tooth receiving cavity 11 to the teeth covered by it during traction, there is a gap of 1mm-2mm between the two ends of the traction unit 13 and the tooth receiving cavity 11 in the horizontal direction.

[0062] In some embodiments, the mechanical strength of the traction part 13 is greater than that of the shell-shaped body 1. Specifically, the traction part 13 and the shell-shaped body 1 are made of the same material, such as PETG, PC, or TPU, or other polymer materials that are safe for use in the oral cavity and have medical device safety, so that they produce a teeth-correcting effect while being safe to wear. In other embodiments, the traction part 13 and the shell-shaped body 1 are different single materials or different multilayer composite materials. More specifically, when the traction part 13 and the shell-shaped body 1 are different single materials, they can be any combination of two of PETG, PC, or TPU. In this case, the traction part 13 and the shell-shaped body 1 can be made of different materials during design or fabrication. For example, the shell-shaped body 1 is made of TPU, and the traction part 13 is made of PETG. In this case, the diaphragm used for hot pressing can be made of different materials in certain areas, or different materials can be used for local areas during 3D direct printing. When the traction part 13 is a multilayer composite material of a different type than the shell-shaped body 1, it can be a multilayer composite material composed of any combination of PETG, PC, or TPU. The traction part 13 can be a multilayer composite material while the shell-shaped body 1 is a single material; the traction part 13 can be a single material while the shell-shaped body 1 is a multilayer composite material; or both the traction part 13 and the shell-shaped body 1 can be multilayer composite materials. More specifically, the traction part 13 is a multilayer composite material different from the shell-shaped body 1. For example, the shell-shaped body 1 may be a single-layer structure or a multilayer composite structure, while the traction part 13 is a multilayer composite material. One layer of the multilayer structure of the traction part 13 can be the same as or different from that of the shell-shaped body 1. For example, the traction part 13 may be composed of two layers of composite material, specifically PETG and TPU, while the shell-shaped body 1 is made of PETG; or the traction part 13 may be composed of two layers of composite material, specifically PETG and TPU, while the shell-shaped body 1 may be composed of two layers of composite material, specifically PETG and PC. The above examples are only some preferred embodiments. All material combinations that can achieve the effects of this utility model are within the protection scope of this utility model and will not be described in detail here.

[0063] Example 2

[0064] In this embodiment, the traction part 13 is a solid structure formed by a portion of the surface of the palatal support part 12 protruding downwards towards the mandible. The traction part 13 and the palatal support part 12 are integrally formed. During the manufacturing process, a virtual shell-shaped dental instrument of this embodiment can be designed using design software, and then the physical shell-shaped dental instrument can be directly printed using additive manufacturing. In this embodiment, the first receiving groove 131 and the second receiving groove 132 are respectively grooves provided on the side surfaces of the two ends of the traction part 13. The first receiving groove 131 and the second receiving groove 132 are directly designed in the design software. The main difference between this embodiment and Embodiment 1 is that the traction part 13 in this embodiment is a solid structure. The other shapes, sizes, and positions of the traction part 13 are the same as in Embodiment 1. The advantage of this design is that the traction part 13 is less prone to deformation during traction, and can provide continuous and stable traction force, thus improving the orthodontic effect.

[0065] Example 3

[0066] In this embodiment, the traction part 13 and the palatal support part 12 are separate structures. The traction part 13 can be fixedly installed on the lingual side of the palatal support part 12 by bonding or riveting. This design allows the traction part 13 to be made of a material with a mechanical strength greater than that of the shell-like body 1, such as PC, ceramic, or metal. In this embodiment, the palatal support part 12 needs to be provided with an installation platform for the traction part 13. The installation platform is partially protruding from the palatal support part 12 towards the lingual side. The advantage of this arrangement is that when the traction part 13 needs to be installed by the doctor in clinical practice, the installation platform can play a role in installation positioning, making the entire installation process simpler and more convenient. Furthermore, when the traction part 13 is riveted to the installation platform, the installation platform is a certain distance from the palate, ensuring that the portion of the traction part 13 held on the palatal side of the palatal support part 12 after assembly will not contact the palate, ensuring patient comfort during treatment. In this embodiment, the first receiving groove 131 and the second receiving groove 132 are respectively grooves provided on the side surfaces of the two ends of the traction part 13. The traction part 13 can be manufactured by additive manufacturing or injection molding. The main difference between this embodiment and Embodiment 1 is that the traction part 13 in this embodiment is a solid structure and is a separate structure from the palatal support part 12. The other shapes, dimensions, and positions of the traction part 13 are the same as in Embodiment 1. The advantage of this design is that the traction part 13 is less prone to deformation during traction, and can provide continuous and stable traction force, thereby improving the orthodontic effect.

[0067] It should be noted that the above embodiments can be freely combined as needed to form different new implementation schemes without causing contradictions. All implementation schemes formed by such combinations are within the protection scope of this utility model. In order to save space in the application text, they will not be described in detail here.

[0068] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

[0069] Similarly, the above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A shell-like dental appliance for wearing on the upper jaw, characterized in that, The shell-shaped body comprises a plurality of tooth receiving cavities, and a palatal support part integrally formed with the shell-shaped body, the plurality of tooth receiving cavities at least wrap the teeth of the anterior teeth area, the palatal support part is connected with the lingual side edge of the tooth receiving cavity corresponding to the teeth of the anterior teeth area, a traction part for suspending a traction element is arranged on the lingual side surface of the palatal support part, and the traction part is arranged in the horizontal direction.

2. The shell-like dental instrument of claim 1, wherein, The traction part is a cavity structure formed by the protrusion of part of the surface of the palatal support part in the direction of the mandible, and the first accommodating groove and the second accommodating groove are arranged on the side surfaces of the two ends of the traction part, respectively.

3. The shell-like dental instrument of claim 2, wherein, The first accommodating groove and the second accommodating groove are formed by the concave of part of the side surface of the traction part to the inside of the traction part.

4. The shell-like dental instrument of claim 2, wherein, The first accommodating groove and the second accommodating groove are opening structures that communicate the inside and the outside of the traction part.

5. The shell-like dental instrument of claim 2, wherein, The first side surface of the traction part adjacent to the anterior teeth area is provided with a third accommodating groove for accommodating the traction element, and the third accommodating groove is arranged in communication with the first accommodating groove and the second accommodating groove, respectively.

6. The shell-like dental instrument of claim 2, wherein, The second side surface of the traction part away from the anterior teeth area is provided with a fourth accommodating groove for accommodating the traction element, and the fourth accommodating groove is arranged in communication with the first accommodating groove and the second accommodating groove, respectively.

7. The shell-like dental instrument of claim 2, wherein, The first side surface of the traction part adjacent to the anterior teeth area and / or the second side surface of the traction part away from the anterior teeth area is provided with a reinforcing structure, wherein the reinforcing structure is arranged to extend from the side adjacent to the palatal support part to the side away from the palatal support part.

8. The shell-like dental instrument of claim 7, wherein, When the first side surface of the traction part adjacent to the anterior teeth area and the second side surface of the traction part away from the anterior teeth area are provided with the reinforcing structure, the reinforcing structure is continuously arranged on the first side surface and the second side surface.

9. The shell-like dental instrument of claim 1, wherein, The traction part is a solid structure formed by the protrusion of part of the surface of the palatal support part in the direction of the mandible, and the first accommodating groove and the second accommodating groove are grooves arranged on the side surfaces of the two ends of the traction part, respectively.

10. The shell-like dental instrument of claim 1, wherein, The whole of the traction part is arranged to be curved in the direction away from the anterior teeth area.

11. The shell-like dental instrument of claim 10, wherein, The curvature of the whole of the traction part is consistent with the curvature of the dental arch corresponding to the anterior teeth area.

12. The shell-like dental instrument of claim 2, wherein, The width of any one cross section of the traction part in the labial-lingual direction gradually decreases from the end adjacent to the palatal support part to the end away from the palatal support part.

13. The shell-like dental instrument of claim 12, wherein, The cross section is semicircular, elliptical or shark fin-shaped.

14. The shell-like dental instrument of claim 1, wherein, The protruding height of the traction part in the direction of the mandible exceeds the incisal edge of the anterior teeth.

15. The shell-like dental instrument of claim 1, wherein, The length of the traction part in the horizontal direction is greater than the length of the three teeth of the anterior teeth area in the horizontal direction at the corresponding position.

16. The shell-like dental instrument of claim 1, wherein, The traction part is fixedly installed on the lingual side surface of the palatal support part, and the mechanical strength of the traction part is greater than the mechanical strength of the shell-shaped body.

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