Integrated shell-shaped dental instrument

Abstract

The utility model discloses an integrated shell-shaped dental instrument, including a plurality of first section that contain the erupted tooth and a plurality of second section that assist the eruption of unerupted tooth, the first section includes the cavity that contains a erupted tooth or a plurality of continuous erupted tooth, and the second section includes the auxiliary eruption part that assists a unerupted tooth or a plurality of continuous unerupted tooth eruption, and the auxiliary eruption part includes an eruption part body and the eruption channel that is along the gum jaw and is through the top wall of eruption part body to supply the natural eruption of unerupted tooth, wherein, the first section and the second section are adjacent arrangement, and the cavity of eruption part body and the first section adjacent with eruption part body near the side of eruption part body are connected. Through the setting of eruption channel, allow unerupted tooth natural eruption and not be physically blocked, thereby guarantee the natural eruption path of the replacement tooth period tooth, improve the security and the comfort of correction.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, more specifically to the field of dental instruments, and particularly to an integrated shell-shaped dental instrument for orthodontic treatment during the mixed dentition period. Background Technology

[0002] The mixed dentition period is a crucial stage for the rapid development of a child's jawbone and dentition. During this stage, both deciduous teeth are lost and permanent teeth erupt, resulting in a complex and variable dentition state. Existing shell-type clear aligners are mostly designed for fully erupted permanent teeth, achieving orthodontic goals by applying external force to the teeth. However, for permanent teeth that have not yet erupted or are in the process of eruption, existing aligners have the following problems: a lack of adaptable structures for unerupted teeth, which can easily create mechanical obstruction during tooth eruption, affecting the normal natural eruption path of the teeth; even though Chinese patent CN202011638977.8 discloses a dental orthodontic system designed to reserve space for the eruption of unerupted teeth. In clinical practice, the applicant found that there is still a discrepancy between the predicted eruption portion of unerupted teeth and the actual eruption. In particular, during the tooth eruption process, the reserved eruption portion may prematurely contact the erupting tooth in the gingival-occlusal direction, thereby hindering the natural eruption of the unerupted tooth. When this happens, it is often necessary to redesign and manufacture invisible aligners that conform to the current tooth eruption status, resulting in a longer treatment period and increased costs.

[0003] Therefore, it is of great significance to improve a shell-shaped dental instrument that can adapt to the developmental characteristics of teeth during the mixed dentition period and assist the natural eruption of unerupted teeth. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide an integrated shell-shaped dental instrument that can adapt to the characteristics of tooth development during the mixed dentition period and assist the natural eruption of unerupted teeth.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An integrated shell-shaped dental instrument includes several first sections for accommodating erupting teeth and several second sections for assisting the eruption of unerupted teeth. Each first section includes a cavity for accommodating one or more consecutively erupting teeth. Each second section includes an auxiliary eruption portion for assisting the eruption of one or more consecutively unerupted teeth. The auxiliary eruption portion includes an eruption portion body and an eruption channel extending along the gingival-occlusal direction through the top wall of the eruption portion body to allow the unerupted tooth to erupt naturally. The first and second sections are arranged adjacent to each other, and the eruption portion body is connected to a cavity in one of the first sections adjacent to the eruption portion body on the side closest to the eruption portion body.

[0007] This invention features an eruption channel extending along the gingival direction through the top wall of the eruption body, forming an open "skylight" structure. This allows the cusp or incisal edge of the unerupted tooth to directly emerge from the channel during eruption, achieving natural eruption with zero resistance. Furthermore, the integrated structure ensures a direct connection between the cavity of the first segment and the eruption body, eliminating mechanical breaks between adjacent teeth in segmented appliances. This allows the corrective force and eruption guiding force to be transmitted within the same rigid whole, preventing localized tilting or dislocation of the shell-shaped dental instrument. This shell-shaped dental instrument, with its unique design, can adapt to the developmental characteristics of teeth during the mixed dentition period, assisting in the natural eruption of unerupted teeth while simultaneously correcting erupted teeth.

[0008] Optionally, the shape and size of the inner peripheral contour of the eruption channel are determined based on a reference tooth, which is either a standard tooth corresponding to the unerupted tooth or a predicted tooth corresponding to the unerupted tooth. In this way, the inner peripheral contour of the eruption channel directly adopts the shape of the standard tooth or the predicted tooth, ensuring a geometrical correspondence between the eruption channel and the future crown contour of the unerupted tooth. This means the distance from the edge of the eruption channel to the crown surface is uniform, avoiding physical obstruction caused by excessive narrowness or material waste due to excessive width.

[0009] Alternatively, the difference between the buccal-lingual width of the eruption channel and the maximum buccal-lingual width of the gingiva at the corresponding position of the unerupted tooth is within a first threshold range, and the difference between the maximum mesiodistal length of the gingiva at the corresponding position of the unerupted tooth and the mesiodistal length of the eruption channel is within a second threshold range, wherein the first threshold range is 0-2 mm and the second threshold range is 0-1 mm. This setting is used to precisely control the spatial dimensions of the eruption channel, ensuring that the unerupted tooth is not blocked or compressed by the eruption body during the eruption process, while avoiding an excessively large eruption channel that would reduce the overall support of the shell-shaped dental instrument, thus balancing eruption freedom and structural stability.

[0010] Optionally, the second segment is adjacent to at least one of the first segments in a mesiodistal upward direction. The first segment adjacent to the second segment and the end of the eruption channel near the first segment are set at a preset distance in a mesiodistal upward direction to provide an eruption gap for the natural eruption of the unerupted tooth. The preset distance ranges from 0 to 2 mm. This arrangement can form an "isolation zone" of the preset distance between the mesiodistal edge of the eruption channel and the edge of the adjacent cavity. On the one hand, the isolation zone can eliminate the direct mesiodistal compression of the eruption channel by the sidewalls of the adjacent cavities. On the other hand, the isolation zone can also act as an elastic buffer, slightly deforming to disperse the orthodontic force from the adjacent cavities and prevent the orthodontic force from being directly transmitted to the eruption channel and causing local deformation.

[0011] Optionally, the predicted tooth is determined based on the erupting teeth adjacent to the unerupted tooth and / or the opposing erupting tooth corresponding to the auxiliary eruption portion among the erupting teeth enclosed by the first segment. The outline of the predicted tooth is constructed based on the adjacent erupting teeth and / or the opposing erupting teeth, ensuring that the mesiodistal width of the predicted tooth is consistent with the actual mesiodistal width of the adjacent teeth. Based on this, the mesiodistal dimensions of the eruption channel can directly reuse the mesiodistal width of the predicted tooth. This avoids the eruption channel being too narrow, which could hinder the eruption of the unerupted tooth.

[0012] Optionally, the eruption body includes a first extension covering the labial / buccal gingiva at the location corresponding to the eruption channel and a second extension connected to the first extension in a mesiodistal direction. The second extension at least covers a portion of the labial / buccal gingiva at the location corresponding to the cavity on the side of the eruption channel in the first segment adjacent to the eruption channel. The second extension is formed by a portion of the labial / buccal lateral surface of the cavity extending toward the gingiva in the gingiomaxillary direction. And / or, the eruption body includes a first extension covering the lingual gingiva at the location corresponding to the eruption channel and a second extension connected to the first extension in a mesiodistal direction. The second extension at least covers a portion of the lingual gingiva at the location corresponding to the cavity on the side of the eruption channel in the first segment adjacent to the eruption channel. The second extension is formed by a portion of the lingual lateral surface of the cavity extending toward the gingiva in the gingiomaxillary direction. In this way, the two extensions are integrally molded with the one-piece shell-shaped dental instrument, fitting snugly against the gingival margin to prevent food debris from directly entering the inner cavity of the shell-shaped dental instrument, reducing gingival irritation and food residue accumulation. Furthermore, the extensions wrap around the gums, so when the child chews, the force on the gums is evenly distributed, avoiding pain or ulcers caused by localized point pressure. At the same time, the extensions increase the contact area between the shell-shaped dental instrument and the gums, using the gums to provide additional retention, reducing edge lifting, and playing a role in auxiliary retention.

[0013] Optionally, the first extension is provided with a plurality of first reinforcing structures extending along the mesiodistal direction. The first reinforcing structures are protruding structures formed by outward projection and / or concave structures formed by inward projection on the surface of the first extension. This configuration, by providing protruding and / or concave reinforcing structures on the first extension, ensures that the first extension still possesses sufficient resistance to fracture and warping when enclosing the gingiva, thereby strengthening the rigidity of the extension and further enhancing the retention effect.

[0014] Optionally, the second extension is provided with a plurality of second reinforcing structures extending along the mesiodistal direction. The second reinforcing structures are protruding structures formed by outward projection and / or concave structures formed by inward projection on the surface of the second extension; wherein the second reinforcing structures are formed by the first reinforcing structures extending along the mesiodistal direction, or the second reinforcing structures and the first reinforcing structures are spaced apart. This arrangement, by also providing protruding and / or concave reinforcing structures on the second extension, ensures that both extensions possess sufficient resistance to fracture and warping when enclosing the gingiva, thus strengthening the rigidity of the extensions and further enhancing the retention effect.

[0015] Optionally, the eruption part body includes a support portion disposed at least along the outer periphery of a portion of the eruption channel, used to enhance the support strength between adjacent second and first segments. The support portion is set at a preset height between itself and the target gingival surface at the position corresponding to the unerupted tooth in the gingival direction. The preset height is greater than or equal to 0 and less than or equal to 1 / 2 to 2 / 3 of the crown height of the unerupted tooth after eruption. By limiting the "preset height," the following is achieved: when the preset height is ≥0, the bottom surface of the support portion is always in contact with or fits against the gingival surface, forming a solid fulcrum; when the preset height is ≤1 / 2 to 2 / 3 of the crown height, the sidewall height of the support portion is limited, so that the top surface of the support portion is lower than the expected occlusal area, avoiding direct contact with the opposing tooth, while also keeping the area above the eruption channel open, preserving sufficient open space above the eruption channel, allowing the cusp of the unerupted tooth to still directly erupt during the eruption process, thus erupting naturally without interference.

[0016] Optionally, the target gingival surface is positioned at a height greater than or equal to 5 mm and less than or equal to 8 mm above the cementoenamel junction in the gingival-occlusal direction. This configuration conforms to the gingival line height changes during the mixed dentition period, ensuring that the support does not obstruct the eruption of unerupted teeth as the gingival line height changes.

[0017] Optionally, the support portion includes several sub-support portions and a separation guide portion for guiding the sub-support portions to separate from the eruption part body. The separation guide portion is disposed along the boundary area between the sub-support portion and an adjacent sub-support portion or the eruption part body, and is used to indicate and guide the separation of the sub-support portion from the eruption part body. Thus, by directly forming separable sub-support portions and their separation guide portions on the support portion, clinicians can completely remove the sub-support portions along a preset boundary area as needed during tooth eruption, immediately expanding the eruption channel space without replacing the entire shell-shaped dental instrument. This also avoids the loss of support at the edge of the eruption channel due to excessive material removal at once, thereby achieving dynamic reduction of the support range while ensuring structural continuity.

[0018] Optionally, the sub-support is elongated, with its long axis forming a first preset angle with the mesiodistal direction of the corresponding unerupted tooth, or a second preset angle with the gingival-occlusal direction of the corresponding unerupted tooth. The range of the first and second preset angles is 0°-30°. This design allows the elongated sub-support to obliquely cross the mesiodistal or gingival-occlusal direction of the unerupted tooth at an angle of 0°-30°. While preserving the open space of the eruption channel, it distributes the chewing load along the inclined surface to the adjacent cavity sidewalls. During removal, it can be completely detached with a single tear along the same oblique direction, avoiding edge tearing or residue caused by vertical traction, ensuring that the expanded channel has neat, unblemished edges.

[0019] Optionally, the width of the sub-support portion in the direction perpendicular to its long axis ranges from 0.2mm to 1mm. This narrow width of 0.2mm–1mm ensures sufficient bending stiffness during normal use, while allowing for instantaneous breakage upon removal with only a small force applied in the direction perpendicular to the long axis. The fracture surface is small and clean, preventing tearing of surrounding structures and ensuring a smooth, undamaged edge after the portal passage is enlarged. It also avoids a sudden drop in support strength due to excessively wide removal.

[0020] Optionally, the separation guide is a shearing indicator line for indicating the shearing path. The shearing indicator line is directly formed on the outer periphery of the sub-support, allowing clinicians or patients to remove it by cutting along the line in one go without additional positioning or measurement. The incision trajectory is completely consistent with the preset boundary, avoiding edge burrs or over-removal caused by manual cutting deviation, and ensuring neat edges and accurate dimensions after the channel is enlarged.

[0021] Optionally, the separation guide is a fracture-prone part that fractures when subjected to a force greater than a predetermined value, causing the sub-support part to break and separate along the fracture-prone part. Under normal conditions, the fracture-prone part maintains a firm connection between the sub-support part and the eruption part body. When a predetermined value slightly greater than the force required for daily chewing is applied, it instantly breaks along its thinnest point, achieving rapid separation without tools. The fracture location is fixed, the edges are smooth, and random tearing avoids support residue or channel gaps, ensuring a smooth and continuous outer periphery even after the channel expands.

[0022] Optionally, the thickness of the fractured portion in the gingival direction is less than the thickness of the eruption body. Thus, the fractured portion is thinned in the gingival direction, with a thickness less than the eruption body, concentrating fracture stress there. This ensures that the sub-support breaks preferentially when subjected to a specified tensile force, resulting in a smooth fracture surface flush with the body surface. After removal, no protrusion remains, avoiding irritation of the gums or impact on occlusion, while preserving the original thickness and strength of the remaining areas of the eruption body.

[0023] Optionally, the thickness of the easily fractured portion in the gingival direction is 1 / 6 to 1 / 12 of the thickness of the eruption body in the gingival direction, or the thickness of the easily fractured portion in the gingival direction is 0.04mm-0.4mm. Precisely controlling the thickness of the easily fractured portion to 1 / 6 to 1 / 12 (or 0.04mm–0.4mm) of the thickness of the eruption body ensures that no unexpected fracture occurs under daily functional loads, and that it breaks instantly when a tensile force slightly greater than this predetermined value is applied, resulting in a clean, fragment-free fracture surface, while the remaining eruption body maintains its original thickness, preventing the channel edge from collapsing or deforming due to localized thinning.

[0024] Optionally, the fractured portion is a mesh-like perforated structure with gaps at intervals to reduce its mechanical strength. The thickness of the connecting portion between adjacent gaps in the gingival-maxillary direction is less than or equal to the thickness of the eruption body. This configuration creates dense, uniform gaps within the fractured portion, and the thickness of the connecting portion between adjacent gaps is less than or equal to the thickness of the eruption body, resulting in a uniform weakening of mechanical strength within the mesh area. When a force greater than a predetermined value is applied, each connecting portion breaks sequentially, ensuring the complete detachment of the sub-support.

[0025] Optionally, the thickness of the connecting portion in the gingival direction gradually decreases from the end of the connecting portion away from the removed sub-support portion to the end near the removed sub-support portion. The thickness of the connecting portion adopts a gradual thinning design, gradually thinning from the end away from the sub-support portion towards the end to be removed, so that the fracture initiation point is precisely located at the thinnest end. When a force greater than a predetermined value is applied, the thinnest part cracks first and expands smoothly along a predetermined direction, avoiding random tearing that causes edge defects or residual sharp corners, ensuring that the sub-support portion is completely separated in one go and that the periphery of the eruption channel remains smooth and continuous.

[0026] Optionally, the thickness of the connecting portion of the mesh-like perforated structure in the gingival direction is 1 / 5 to 1 / 10 of the thickness of the eruption body in the gingival direction, or the thickness of the connecting portion of the mesh-like perforated structure in the gingival direction is 0.1mm-0.5mm. Thus, setting the thickness of the connecting portion of the mesh-like perforated structure to 1 / 5 to 1 / 10 (or 0.1mm–0.5mm) of the thickness of the eruption body maintains the rigidity required for daily wear while creating a uniformly weakened zone in the mesh area. When a removal force greater than a predetermined value is applied, each connecting portion breaks sequentially, the breaking force is dispersed, and the break line is straight, avoiding premature cracking due to excessive thinness or difficulty in separation due to excessive thickness, ensuring that the sub-support detaches completely and the remaining sub-support has a consistent edge thickness.

[0027] Optionally, the length and / or width of the connecting portion is 0.1mm-0.5mm. Thus, a short and narrow connecting portion formed within this size range will break rapidly when subjected to a tensile force greater than a predetermined value, avoiding the possibility of an excessively long connecting portion causing poor breakage, such as the possibility of some residual connecting portion, thereby ensuring that the mesh cutout area is completely separated along the preset path.

[0028] Optionally, the inner diameter of the gap along the mesiodistal or gingival-maxillary direction is 0.5mm-1mm. Leaving a 0.5mm-1mm space in the inner diameter of the gap allows for direct insertion and clamping of the connecting part by the tip of scissors or forceps, enabling the tool to apply force without expansion. This also avoids excessively large cutouts that could weaken the surrounding structure. This design maintains the overall strength of the mesh area and the controllability of fracture.

[0029] Optionally, a pulling part protrudes from the top wall of the sub-support, and the pulling part is integrally formed with the sub-support. Pulling the pulling part separates the sub-support from the budding part body. By providing a pulling part and an exposed "handle," clinicians or patients can directly grasp the pulling part and tear it along a preset direction without the need for additional tools, thus completing the breaking operation of the broken part and achieving convenient and quick removal. Attached Figure Description

[0030] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same numerical reference numerals are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0031] Figure 1 This is a schematic diagram of the structure of an integrated shell-shaped dental orthodontic instrument according to Embodiment 1 of this utility model;

[0032] Figure 2 This is a schematic diagram of another integrated shell-shaped dental orthodontic instrument in Embodiment 1 of this utility model;

[0033] Figure 3 This is a schematic diagram of an integrated shell-shaped dental orthodontic instrument with a first extension and a second extension, according to Embodiment 1 of this utility model.

[0034] Figure 4 This is a schematic diagram of another integrated shell-shaped dental orthodontic instrument with a first extension and a second extension in Embodiment 1 of this utility model.

[0035] Figure 5 This is a schematic diagram of another integrated shell-shaped dental orthodontic instrument with a first extension and a second extension in Embodiment 1 of this utility model.

[0036] Figure 6This is a schematic diagram of the structure of an integrated shell-shaped dental orthodontic instrument according to Embodiment 2 of this utility model;

[0037] Figure 7 This is a schematic diagram of another integrated shell-shaped dental orthodontic instrument in Embodiment 2 of this utility model;

[0038] Figure 8 This is a schematic diagram of the structure of another integrated shell-shaped dental orthodontic instrument in Embodiment 2 of this utility model;

[0039] Figure 9 for Figure 8 A magnified view of a portion of region A in the middle;

[0040] Figure 10 for Figure 9 A schematic diagram of the cross-section along P-P' of the easily fractured part. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model 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 provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model.

[0042] The directional terms "up," "down," "left," and "right" used in this document refer to the directions shown in the accompanying drawings and do not imply any specific limitation. Unless otherwise explicitly stated or limited, the term "connection" in this document should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part of a structure. It can refer to a direct connection or an indirect connection through an intermediate medium.

[0043] In the various embodiments of this invention, the term "posterior tooth region" 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 tooth region. The teeth in the anterior tooth region include the central incisors, lateral incisors, and canines.

[0044] The following will provide a detailed explanation of this application in conjunction with the illustrations.

[0045] Example 1

[0046] Please refer to Figure 1As shown, the integrated shell-shaped dental instrument 100 provided in this application is mainly used for orthodontic treatment during the mixed dentition period. It includes several first segments 1 for accommodating erupted teeth and several second segments 2 for assisting the eruption of unerupted teeth. The first segment 1 includes a cavity 3 for accommodating one or more consecutively erupted teeth. It should be noted that the term "erupted teeth" in this application refers to all teeth that have fully erupted in the child's mouth. It can include fully erupted teeth scattered in different positions, as well as continuously distributed fully erupted teeth. The first segment 1 can be a cavity 3 that only accommodates one erupted tooth, or it can be a cavity 3 that accommodates multiple consecutively distributed erupted teeth; and the first segment 1 itself can also be one or more.

[0047] The second section 2 includes an auxiliary eruption part 4 to assist in the eruption of one or more consecutive unerupted teeth. It should be noted that the unerupted teeth in this application include completely unerupted teeth and teeth that are erupting but not yet fully erupted. Similarly, the unerupted teeth can be scattered in different tooth positions or continuously distributed in multiple adjacent tooth positions. The auxiliary eruption part 4 includes an eruption part body 41 and an eruption channel 42. The eruption channel 42 is disposed along the gingival-occlusal direction, penetrating the top wall of the eruption part body 41, for allowing the unerupted teeth to erupt naturally. The first section 1 and the second section 2 are arranged adjacent to each other. The eruption part body 41 is connected to a cavity 3 in the first section 1 adjacent to the eruption part body 41 on the side near the eruption part body 41.

[0048] Through the above-mentioned design, on the one hand, this application creates an eruption channel 42 along the gingival direction, penetrating the top wall of the eruption body 41, forming an open "skylight" structure. This allows the cusp or incisal edge of the unerupted tooth to directly emerge from the channel during eruption, achieving natural eruption with zero resistance. On the other hand, the integrated structure ensures that the cavity 3 of the first segment 1 is directly connected to the eruption body 41, eliminating mechanical breaks between adjacent teeth in segmented orthodontic appliances. This allows the corrective force and eruption guiding force to be transmitted within the same rigid whole, preventing localized tilting or dislocation of the shell-shaped dental instrument 100. The shell-shaped dental instrument 100, with this design, can adapt to the developmental characteristics of teeth during the mixed dentition period, assisting in the natural eruption of unerupted teeth while simultaneously correcting erupted teeth.

[0049] Furthermore, in some embodiments, the inner peripheral contour shape and size of the eruption channel 42 are determined based on a reference tooth, which is either a standard tooth corresponding to the unerupted tooth or a predicted tooth corresponding to the unerupted tooth. Specifically, the reference tooth can be a standard tooth corresponding to the unerupted tooth; when the position of the unerupted tooth is determined, the standard tooth corresponding to that position can be directly retrieved from a standard tooth database. Alternatively, the reference tooth can be a predicted tooth corresponding to the unerupted tooth.

[0050] Furthermore, the predicted tooth can be determined from the erupting teeth adjacent to the unerupted tooth among the erupting teeth enclosed by the first segment 1 and / or the opposing erupting tooth corresponding to the auxiliary eruption portion 4. Based on the adjacent erupting teeth, the mesiodistal length of the unerupted tooth can be predicted. Based on the opposing erupting tooth, and with the goal of ensuring no occlusal interference with the opposing erupting tooth, the height of the unerupted tooth after eruption can be determined. It should be noted that if an orthodontic appliance is worn on the opposing tooth, this height is aimed at ensuring no occlusal interference with the appliance cavity 3 enclosed on the opposing erupting tooth.

[0051] In this application, the inner peripheral contour of the eruption channel 42 directly adopts the shape of a standard tooth or a predicted tooth, so that the eruption channel 42 and the future crown contour of the unerupted tooth maintain a geometric correspondence in shape. That is, the distance between each edge of the eruption channel 42 and the crown surface is uniform and consistent, avoiding solid obstruction caused by excessive narrowness or material waste caused by excessive width.

[0052] In other embodiments, the difference between the buccal-lingual width of the eruption channel 42 and the maximum buccal-lingual width of the gingiva at the corresponding position of the unerupted tooth is within a first threshold range, wherein the first threshold range is 0-2 mm; the difference between the maximum mesiodistal length of the gingiva at the corresponding position of the unerupted tooth and the mesiodistal length of the eruption channel 42 is within a second threshold range, wherein the second threshold range is 0-1 mm. This application achieves a balance between eruption freedom and structural stability by limiting the buccal-lingual or mesiodistal dimensional range of the eruption channel 42 and the gingiva at the corresponding position of the unerupted tooth, thereby precisely controlling the spatial dimensions of the eruption channel 42. This ensures that the unerupted tooth is not blocked or compressed by the eruption body in the buccal-lingual or mesiodistal direction during eruption, while also preventing the eruption channel 42 from becoming too large, which would reduce the overall support of the shell-shaped dental instrument 100.

[0053] Furthermore, the second segment 2 is adjacent to at least one of the first segments 1 in a mesiodistal upward direction. The first segment 1 adjacent to the second segment 2 and the end of the eruption channel 42 near the first segment 1 are set at a preset distance in a mesiodistal upward direction to provide an eruption gap for the natural eruption of the unerupted tooth, wherein the preset distance ranges from 0 to 2 mm. Please continue reading. Figure 2As shown, the second segment 2 is arranged adjacent to the two first segments 1 in a mesiodistal upward direction. The first segment 1 located on the distal side of the second segment 2 and the distal edge of the eruption channel 42 are arranged at a preset distance d1 in a mesiodistal upward direction. The first segment 1 located on the proximal side of the second segment 2 and the proximal edge of the eruption channel 42 are arranged at a preset distance d2 in a mesiodistal upward direction. This forms an "isolation zone" with a mesiodistal length between the proximal or distal edge of the eruption channel 42 and the edge of the adjacent cavity 3. On the one hand, the "isolation zone" with a preset distance can eliminate the direct compression of the eruption channel 42 by the sidewall of the adjacent cavity 3 in a mesiodistal direction. On the other hand, the "isolation zone" with a preset distance can also play an elastic buffering role, which can be slightly deformed to disperse the corrective force from the adjacent cavity 3 and prevent the corrective force from being directly transmitted to the eruption channel 42 and causing local deformation.

[0054] Furthermore, please refer to the following: Figures 3 to 5 As shown, the eruption body 41 of this application further includes a first extension 5 covering the labial / buccal gingiva at the corresponding position of the eruption channel 42, and a second extension 6 connected to the first extension 5 in the mesiodistal direction. The second extension 6 at least covers a portion of the labial / buccal gingiva at the corresponding position of the cavity 3 on the side of the first segment 1 adjacent to the eruption channel 42. The second extension 6 is formed by a portion of the labial / buccal side surface of the cavity 3 extending towards the gingiva in the gingival-occlusal direction. Thus, by providing two extensions, the two extensions fit snugly against the gingiva, increasing the contact area between the shell-shaped dental instrument 100 and the gingiva, utilizing the gingiva to provide additional retention, reducing edge lifting, and achieving an auxiliary retention effect. Simultaneously, the two extensions fitting snugly against the gingival margin can prevent food debris from directly entering the inner cavity of the shell-shaped dental instrument 100, reducing gingival margin irritation and food residue accumulation; and the extensions wrap around the gingiva, so that when the child chews, the force on the gingiva is evenly distributed, avoiding pain or ulceration caused by localized point pressure.

[0055] Specifically, the mesial side of the first extension 5 extends mesially to the gingival position corresponding to the cavity 3 adjacent to the mesial side of the eruption channel 42, and the distal side of the first extension 5 extends distally to the gingival position corresponding to the cavity 3 adjacent to the distal side of the eruption channel 42. (See reference...) Figure 3 As shown, the mesial and distal sides of the first extension 5 extend to the gingival position corresponding to the adjacent cavity 3, covering only a portion of the gingiva. Similarly, the second extension 6 can only cover a portion of the gingiva at the corresponding position of the cavity 3, thus increasing the overall retention force of the shell-shaped dental instrument 100. Of course, it is understood that this should be considered in conjunction with... Figure 4 and Figure 5As shown, the second extension 6 can cover the entire gingiva at the corresponding position of the cavity 3, thus enhancing the overall retention of the shell-shaped dental instrument 100.

[0056] Further reading is available here. Figures 3 to 5 As shown, the first extension 5 is provided with a plurality of first reinforcing structures 51 extending through the mesiodistal direction. The first reinforcing structures 51 are protruding structures formed by outward projections from the surface of the first extension 5 and / or concave structures formed by inward projections. This configuration improves the bending resistance of the first extension 5 in the mesiodistal direction, thereby further enhancing the retention effect of the shell-shaped dental instrument 100. These protruding structures can be continuous raised strips or a plurality of discretely arranged protrusions or dots along the mesiodistal direction. In another embodiment, the reinforcing structure of the first extension 5 is a concave structure formed by a partial concavity within the first extension 5. Similarly, these concave structures can be continuous grooves or a plurality of discretely arranged small pits along the mesiodistal direction. Of course, it is also understood that, whether protruding or concave, these reinforcing structures may not completely penetrate (not shown), and can also locally enhance the bending resistance of the extension.

[0057] Furthermore, the second extension 6 is also provided with a plurality of second reinforcing structures 61 extending along the mesiodistal direction. The second reinforcing structure 61 is a protruding structure formed by the outward convexity of the surface of the second extension 6 and / or a concave structure formed by the inward concavity. Similarly, the structure and formation of the second reinforcing structure 61 are consistent with the structure and formation of the first reinforcing structure 51, and will not be described again here. This arrangement, by also providing outward convex and / or concave reinforcing structures on the second extension 6, ensures that both extensions still possess sufficient resistance to fracture and warping when enclosing the gingiva, thus strengthening the rigidity of the extensions and further enhancing the retention effect. Specifically, in some embodiments, please continue to refer to... Figure 4 As shown, the second reinforcing structure 61 is formed by extending the first reinforcing structure 51 in a proximal-distal direction. Other embodiments are also possible; please continue to refer to… Figure 5 As shown, the second reinforcing structure 61 and the first reinforcing structure 51 can also be arranged at the gingival-maxillary lateral septum. Various arrangement options are available, allowing for flexible selection based on clinical needs.

[0058] Furthermore, it is understood that in other embodiments, the eruption body 41 of this application may also include a first extension 5 covering the lingual gingiva at the position corresponding to the eruption channel 42 and a second extension 6 connected to the first extension 5 in a mesiodistal direction. The second extension 6 at least covers a portion of the lingual gingiva at the position corresponding to the cavity 3 on the side of the first segment 1 adjacent to the eruption channel 42, and the second extension 6 is formed by a portion of the lingual side surface of the cavity 3 extending toward the gingiva in the gingival direction. These embodiments differ from the first extension 5 and the second extension 6 provided on the buccal side in that the first extension 5 and the second extension 6 cover the gingiva at the position where the gingiva is located, that is, the first extension 5 and the second extension 6 cover the eruption channel 42 and the lingual gingiva corresponding to the cavity 3 on the side of the first segment 1 adjacent to the eruption channel 42. As for the formation method and structure, they can be set with reference to the first extension 5 and the second extension 6 on the buccal side, and will not be described in detail here.

[0059] Through the design of this embodiment, on the one hand, by setting an eruption channel along the gingival direction through the top wall of the eruption part body, this application forms an open "skylight" structure. Thus, the cusp or incisal edge of the unerupted tooth can directly push out of the channel during the eruption process, achieving natural eruption with zero resistance. On the other hand, the integrated structure ensures that the cavity of the first segment is directly connected to the eruption part body, eliminating the mechanical breakpoints between adjacent teeth in segmented orthodontic appliances. This allows the orthodontic force and eruption guiding force to be transmitted within the same rigid whole, making the shell-shaped dental instrument less prone to local tilting or dislocation. Furthermore, a first extension and a second extension can be provided at the gingival position corresponding to the eruption channel and the cavity adjacent to the eruption channel. These two extensions fit snugly against the gingiva, increasing the contact area between the integrated shell-shaped dental instrument and the gingiva, utilizing the gingiva to provide additional retention, reducing edge tilting, and achieving an auxiliary retention effect. Further, by providing several reinforcing structures on the two extensions, the deformation resistance of the two extensions can be further enhanced, thereby further ensuring the retention effect. This integrated shell-shaped dental instrument can be adapted to the developmental characteristics of teeth during the mixed dentition period, and can assist in the natural eruption of unerupted teeth while treating erupted teeth.

[0060] Example 2

[0061] To achieve the purpose of this invention, this application also provides an integrated shell-shaped dental instrument 100, please refer to the following: Figures 6 to 10As shown. Based on Embodiment 1, this embodiment further strengthens the support between the auxiliary eruption part 4 and the adjacent first segment 1 by providing the support part 7, thereby ensuring that the overall mechanical strength of the shell-shaped orthodontic appliance meets clinical needs.

[0062] The eruption body 41 of this application includes a support portion 7 disposed at least along a portion of the outer periphery of the eruption channel 42, used to enhance the support strength between adjacent second segment 2 and first segment 1. Further, a preset height h is limited between the support portion 7 and the target gingival surface at the position corresponding to the unerupted tooth in the gingival direction. The preset height h is greater than or equal to 0, used to ensure that the bottom surface of the support portion 7 is always in contact or fits against the gingival surface, forming a solid fulcrum, which helps to realize the support portion 7 for the integrated shell-like dental tooth. The preset height h needs to be less than or equal to 1 / 2 to 2 / 3 of the crown height of the unerupted tooth after eruption. In this way, the side wall height of the support portion 7 can be limited, so that the top surface of the support portion 7 in the gingival direction is lower than the expected occlusal area, avoiding direct contact with the opposing tooth, while keeping the area above the eruption channel 42 open, retaining sufficient open space above the eruption channel 42, so that the cusp of the unerupted tooth can still be directly pushed out during the eruption process, thus erupting naturally without interference.

[0063] It should be noted that the height of the target gingival surface from the cementoenamel junction in the gingival-occlusal direction is greater than or equal to 5 mm and less than or equal to 8 mm. This setting conforms to the gingival line height changes during the mixed dentition period. In most children during the mixed dentition period, after the primary incisors fall out and the permanent incisors just erupt, the gingival line is often "high," covering about 1 / 3 to 1 / 2 of the crown height of the new tooth. As the first permanent molars and canines continue to erupt and the alveolar ridge grows vertically, the gingival line relatively "descends" until the end of the mixed dentition period, when the gingival line position is basically stable, consistent with that of adults. During this process, the maximum change in gingival line height is about 5 mm to 8 mm. The setting of this application can ensure that during the eruption of unerupted teeth, the support part 7 will not hinder the eruption of unerupted teeth during the gingival line height changes.

[0064] Further, the support portion 7 can be configured as follows: including a plurality of sub-support portions 71 and a separation guide portion 72 for guiding the sub-support portions 71 to separate from the eruption body 41. The separation guide portion 72 is disposed along the boundary area between the sub-support portion 71 and the adjacent sub-support portion 71 or the eruption body 41, and is used to indicate and guide the separation of the sub-support portion 71 from the eruption body 41. In this way, clinicians can completely remove the sub-support portions 71 along the preset boundary area as needed during tooth eruption, immediately expanding the space of the eruption channel 42 without replacing the entire shell-shaped dental instrument 100. This also avoids the loss of support at the edge of the eruption channel 42 due to excessive material removal at one time, thereby achieving dynamic reduction of the support range while ensuring structural continuity. Specifically, in one embodiment, the support portion 7 is circumferentially disposed on the outer periphery of the eruption channel 42, such as... Figure 6 As shown, both the support portion 7 and the sub-support portion 71 are arranged in a near-circular shape. The sub-support portion 71 near the eruption channel 42 has an outer contour, and the other sub-support portion 71 adjacent to it has an inner contour. The separation guide portion 72 is circumferentially disposed between the outer contour of the sub-support portion 71 near the eruption channel 42 and the inner contour of the other sub-support portion 71. This arrangement can be repeated when multiple sub-support portions 71 and separable guide portions 72 are provided. In this embodiment, the separation guide portion 72 is a shearing indicator line used to indicate the shearing path. When it is necessary to enlarge the eruption channel 42, the sub-support portion 71 can be removed along the separation guide portion 72 to enlarge the eruption channel 42, allowing the tooth to erupt naturally without obstruction. Of course, it is understood that the separation guide portion 72 can also be a fracture-prone part, which will be explained in the following description.

[0065] In another embodiment, such as Figure 7 As shown, the support portion 7 is only provided along the buccal and lingual outer periphery of the eruption channel 42. The sub-support portions 71 are arranged in a similar elongated shape. A separation guide portion 72 is provided between each removable sub-support portion 71 and the sub-support portion 71 to be retained. Clinically, depending on the tooth eruption situation, for example, when a tooth erupts to a certain height, if the tip of the erupting tooth collides with or is about to interfere with the support portion 7, it can be separated from the separation guide portion 72, thereby ensuring the natural eruption of the tooth. Further, the long axis of the elongated shape is set at a first preset angle with the mesiodistal direction of the unerupted tooth corresponding to the support portion 7. The first preset angle can be in the range of 0°-30°. In this embodiment, the long axis of the elongated shape is approximately consistent with the mesiodistal direction of the unerupted tooth corresponding to the support portion 7. Further, please refer to... Figure 9 As shown, the width L of the sub-support 71 in the direction perpendicular to the long axis of the sub-support 71 (i.e., buccal-lingual direction) can be set to 0.2mm-1mm. Keeping the width L of the sub-support 71 at 0.2mm-1mm can avoid the difficulties of separation due to excessive width, as well as the adverse consequences such as the collapse caused by a sharp decrease in the support force of the auxiliary eruption part 4 on the labial-buccal or lingual side due to the removal of too much at once, and deformation of the adjacent cavities 3 on both sides. At the same time, it can also prevent the problem of premature breakage caused by the removal of the sub-support 71 that is too narrow. In this way, the narrow strip design of 0.2mm-1mm can make the separable part separate from the shell-shaped dental instrument 100 accurately and neatly, while also taking into account the support of the remaining support part 7.

[0066] In yet another implementation, such as Figure 8 As shown, the support portion 7 is only arranged along the mesial and distal outer periphery of the eruption channel 42. The sub-support portion 71 is also similarly elongated. Similarly, a separation guide portion 72 is provided between each removable sub-support portion 71 and the sub-support portion 71 to be retained. Clinically, depending on the tooth eruption situation, for example, when a tooth erupts to a certain height, if the tip of the erupting tooth collides with or is about to interfere with the support portion 7, it can be separated from the separation guide portion 72, thereby ensuring the natural eruption of the tooth. Furthermore, the long axis of the elongated portion is set at a second preset angle with the gingival direction of the unerupted tooth corresponding to the support portion 7. The second preset angle can range from 0° to 30°. In this embodiment, the long axis of the elongated portion is approximately consistent with the gingival direction of the unerupted tooth corresponding to the support portion 7. Similarly, in this embodiment, the width of the sub-support 71 in the direction perpendicular to the long axis of the sub-support 71 (i.e., the mesial-to-distal direction) can be set to 0.2mm-1mm.

[0067] In this embodiment, the separation guide 72 is a fracture-prone part. Under normal conditions, the fracture-prone part maintains a firm connection between the sub-support part 71 and the sprouting part body 41. When a force slightly greater than a predetermined value is applied, the fracture-prone part breaks, and thus the sub-support part 71 can be separated along the location of the fracture-prone part.

[0068] Specifically, please refer to the following: Figure 9As shown, the easily breakable portion is a mesh-like perforated structure with gaps 73 spaced apart. This structure reduces the mechanical strength of the easily breakable portion. Furthermore, the thickness of the connecting portion 74 between adjacent gaps 73 in the gingival-maxillary direction can be set to be less than or equal to the thickness of the eruption body 41. This configuration creates dense, uniform gaps 73 within the easily breakable portion, and the thickness of the connecting portion 74 between adjacent gaps 73 is less than or equal to the thickness of the eruption body 41, allowing the mechanical strength to be uniformly weakened in the mesh area. When a force greater than a predetermined value is applied, each connecting portion 74 breaks sequentially, ensuring the complete detachment of the sub-support 71.

[0069] Furthermore, the thickness of the connecting portion 74 in the gingival direction gradually decreases from the end of the connecting portion 74 away from the removed sub-support portion 71 to the end near the removed sub-support portion 71. Thus, when the thickness of the connecting portion 74 is less than the thickness of the eruption body 41, the connecting portion 74 is further thinned in the gingival direction, concentrating the fracture stress there. This ensures that the sub-support portion 71 breaks preferentially under a specified tensile force, with a smooth fracture surface flush with the body surface, leaving no protrusions after removal, avoiding irritation to the gums or affecting occlusion, while preserving the original thickness and strength of the remaining areas of the eruption body 41. For details, please refer to [reference needed]. Figure 10 As shown, the distal and proximal ends of the easily fractured portion are adjacent to the sub-support portion 71-1 that needs to be removed and the sub-support portion 71-2 that needs to be retained, respectively. The thickness of the connecting portion 7474 at the end near the sub-support portion 71-1 that needs to be removed is greater than the thickness at the end near the sub-support portion 71-2 that needs to be retained. This design ensures that when the doctor applies force, the thinnest end cracks first, i.e., it breaks first on the side away from the sub-support portion 71-1 that needs to be removed, i.e., on the side near the sub-support portion 71-2 that needs to be retained. The fracture location is clear, avoiding random fractures that leave easily fractured portions, such as sharp points, on the remaining support portion 7 to be retained, thus maintaining the smoothness of the support portion 7's edges.

[0070] Specifically, in some embodiments, the thickness of the connecting portion 74 of the mesh hollow structure in the gingival direction can be set to 1 / 5 to 1 / 10 of the thickness of the eruption body 41 in the gingival direction, or the thickness of the connecting portion 74 of the mesh hollow structure in the gingival direction can be set to 0.1mm-0.5mm. This thickness setting of the connecting portion 74 can maintain the rigidity required for daily wear while creating a uniformly weakened zone in the mesh area; when a removal force greater than a predetermined value is applied, each connecting portion 74 breaks sequentially, the breaking force is dispersed and the break line is straight, avoiding premature cracking due to excessive thinness or difficulty in separation due to excessive thickness, ensuring that the sub-support portion 71 detaches completely and the remaining sub-support body has a consistent edge thickness.

[0071] Furthermore, to facilitate breakage, the dimension R1 of the connecting portion 74 is set to be relatively small, while the inner diameter R2 of the gap 73 is set to be relatively large; wherein, the dimension R1 of the connecting portion 74 is the distance between two adjacent gaps 73, and the inner diameter R2 of the gap 73 is the distance between two adjacent connecting portions 74. In one embodiment, the length dimension R1 of the connecting portion 74 in the mesiodistal direction is set to be approximately 0.1mm-0.5mm, or the width dimension of the connecting portion 74 in the gingival direction is also set to be approximately 0.1mm-0.5mm; with this setting, the connecting portion 74 forms a narrow and short beam within the 0.1mm-0.5mm range, which is easy to break under a force greater than a predetermined value, and the fracture surface is small with relatively smooth edges, without affecting the overall shape of the remaining support portion 7.

[0072] Furthermore, the inner diameter R2 of the gap 73 is set approximately in the mesiodistal direction to be 0.5mm-1mm, or the inner diameter of the gap 73 is set approximately in the gingival direction to be 0.5mm-1mm. This setting provides sufficient clearance for the insertion of the tip of a tool (such as a clamping forceps) to clamp the connecting part 74. This size of the inner diameter of the gap 73 facilitates operation while also considering strength and operability. It weakens the mechanical strength of easily fractured parts, making them prone to breakage, while preventing excessive clearance from causing local collapse of the support part 7.

[0073] Optionally, in addition to the mesh-like perforated structure, the easily breakable portion can be configured in different ways. For example, in some embodiments, the thickness of the easily breakable portion can be set to 1 / 6 to 1 / 12 of the thickness of the eruption body 41 in the gingival-maxillary direction, or the thickness of the easily breakable portion in the gingival-maxillary direction can be specifically set to 0.04mm-0.4mm. Setting the thickness of the easily breakable portion in this way ensures that unexpected breakage does not occur under daily functional loads, and that it breaks instantly when a tensile force slightly greater than the predetermined value is applied, resulting in a clean, fragment-free fracture surface, while the remaining eruption body 41 maintains its original thickness, preventing the channel edge from collapsing or deforming due to localized thinning.

[0074] Furthermore, this application may also provide a pulling part 8 protruding from the top wall of the sub-support part 71. The pulling part 8 is integrally formed with the sub-support part 71, and pulling the pulling part 8 can separate the sub-support part 71 from the budding part body 41. By providing the pulling part 8, an exposed "handle" is provided for clinicians or patients. Clinicians or patients can directly clamp the pulling part 8 and tear it in a preset direction without the need for additional tools, thus completing the breaking operation of the broken part and achieving convenient and quick removal.

[0075] Other technical features of this embodiment are the same as those of Embodiment 1. They can be used in conjunction with the technical features of this embodiment without conflict with this embodiment, and will not be described again here.

[0076] 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 application. In order to save space in the application text, they will not be described in detail here.

[0077] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the inventive principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this application.

[0078] Similarly, the above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A one-piece shell-shaped dental instrument, characterized in that, It includes several first sections for accommodating erupting teeth and several second sections for assisting the eruption of unerupted teeth. The first section includes a cavity for accommodating one or more consecutively erupting teeth. The second section includes an auxiliary eruption part for assisting the eruption of one or more consecutively unerupted teeth. The auxiliary eruption part includes an eruption part body and an eruption channel that penetrates the top wall of the eruption part body along the gingival direction to allow the unerupted tooth to erupt naturally. The first section and the second section are arranged adjacent to each other, and the eruption part body is connected to the cavity on the side of the first section adjacent to the eruption part body.

2. The integrated shell-shaped dental instrument according to claim 1, characterized in that, The inner peripheral contour shape and size of the eruption channel are determined based on a reference tooth, which is either the standard tooth corresponding to the unerupted tooth or the predicted tooth corresponding to the unerupted tooth. or, The difference between the buccal-lingual width of the eruption channel and the maximum buccal-lingual width of the gingiva at the corresponding tooth position of the unerupted tooth is within a first threshold range, and the difference between the maximum mesiodistal length of the gingiva at the corresponding tooth position of the unerupted tooth and the mesiodistal length of the eruption channel is within a second threshold range, wherein the first threshold range is 0-2mm and the second threshold range is 0-1mm.

3. The integrated shell-shaped dental instrument according to claim 2, characterized in that, The second segment is adjacent to at least one of the first segments in a mesiodistal upward direction. The first segment adjacent to the second segment and the end of the eruption channel near the first segment are set at a preset distance in a mesiodistal upward direction to provide an eruption gap for the natural eruption of the unerupted tooth. The preset distance ranges from 0 to 2 mm.

4. The integrated shell-shaped dental instrument according to claim 2 or 3, characterized in that, The predicted tooth is determined based on the erupting teeth adjacent to the unerupted tooth and / or the opposing erupting tooth corresponding to the auxiliary eruption portion among the erupting teeth enclosed by the first segment.

5. The integrated shell-shaped dental instrument according to claim 1, characterized in that, The eruption body includes a first extension covering the labial / buccal gingiva at the location corresponding to the eruption channel, and a second extension connected to the first extension in a mesiodistal direction. The second extension at least covers a portion of the labial / buccal gingiva at the location corresponding to the cavity on the side of the eruption channel in a first segment adjacent to the eruption channel. The second extension is formed by a portion of the labial / buccal lateral surface of the cavity extending toward the gingiva in the gingival-occlusal direction; and / or The eruption body includes a first extension covering the lingual gingiva at the position corresponding to the eruption channel and a second extension connected to the first extension in the mesiodistal direction. The second extension at least covers the lingual gingiva at the position corresponding to the cavity on the side of the eruption channel in a first segment adjacent to the eruption channel. The second extension is formed by a portion of the lingual side surface of the cavity extending toward the gingiva in the gingival direction.

6. The integrated shell-shaped dental instrument according to claim 5, characterized in that, The first extension is provided with a plurality of first reinforcing structures extending along the proximal-distal direction. The first reinforcing structure is a protruding structure formed by the outward convexity of the surface of the first extension and / or a concave structure formed by the inward concavity.

7. The integrated shell-shaped dental instrument according to claim 6, characterized in that, The second extension is provided with a plurality of second reinforcing structures extending along the mesial-distal direction. The second reinforcing structure is a protruding structure formed by the outward convexity of the surface of the second extension and / or a concave structure formed by the inward concavity. The second reinforcing structure is formed by the first reinforcing structure extending along the mesial-distal direction, or the second reinforcing structure and the first reinforcing structure are provided at intervals.

8. The integrated shell-shaped dental instrument according to claim 1 or 5, characterized in that, The eruption body includes a support portion disposed at least along a portion of the outer periphery of the eruption channel to enhance the support strength between adjacent second and first segments. The support portion is disposed at a preset height between the gingival and occlusal direction and the top surface of the target gingival tooth at the position corresponding to the unerupted tooth. The preset height is greater than or equal to 0 and less than or equal to 1 / 2 to 2 / 3 of the crown height of the unerupted tooth after eruption.

9. The integrated shell-shaped dental instrument according to claim 8, characterized in that, The target gingival surface is at a height of 5 mm or more and less than or equal to 8 mm above the cementoenamel junction in the gingival-occlusal direction.

10. The integrated shell-shaped dental instrument according to claim 8, characterized in that, The support includes a plurality of sub-supports and a separation guide for guiding the sub-supports to separate from the budding part body. The separation guide is disposed along the boundary area between the sub-support and an adjacent sub-support or the budding part body, and is used to indicate and guide the separation of the sub-support from the budding part body.

11. The shell-shaped dental instrument according to claim 10, characterized in that, The sub-support is elongated, and the long axis of the elongated part forms a first preset angle with the mesiodistal direction of the unerupted tooth corresponding to the support, or forms a second preset angle with the gingival-occlusal direction of the unerupted tooth corresponding to the support, wherein the range of the first preset angle and the second preset angle is 0°-30°.

12. The shell-shaped dental instrument according to claim 11, characterized in that, The width of the sub-support portion in the direction perpendicular to the long axis of the sub-support portion ranges from 0.2mm to 1mm.

13. The one-piece shell-shaped dental instrument according to any one of claims 10 to 12, characterized in that, The separation guide is a shearing indicator line used to indicate the shearing path.

14. The one-piece shell-shaped dental instrument according to any one of claims 10 to 12, characterized in that, The separation guide is a fracture-prone part, which breaks when subjected to a force greater than a predetermined value, so that the sub-support part breaks and separates along the location of the fracture-prone part.

15. The integrated shell-shaped dental instrument according to claim 14, characterized in that, The thickness of the fractured portion in the gingival-maxillary direction is less than the thickness of the eruption body.

16. The integrated shell-shaped dental instrument according to claim 15, characterized in that, The thickness of the easily fractured portion in the gingival direction is 1 / 6 to 1 / 12 of the thickness of the eruptive portion body in the gingival direction, or the thickness of the easily fractured portion in the gingival direction is 0.04 mm to 0.4 mm.

17. The integrated shell-shaped dental instrument according to claim 14, characterized in that, The easily breakable part is a mesh-like hollow structure with gaps at intervals to reduce the mechanical strength of the easily breakable part. The thickness of the connecting part between adjacent gaps in the gingival-maxillary direction is less than or equal to the thickness of the eruption part body.

18. The shell-shaped dental instrument according to claim 17, characterized in that, The thickness of the connecting portion in the gingival direction gradually decreases from the end of the connecting portion away from the removed sub-support portion to the end near the removed sub-support portion.

19. The integrated shell-shaped dental instrument according to claim 17, characterized in that, The thickness of the connecting part of the mesh hollow structure in the gingival direction is 1 / 5 to 1 / 10 of the thickness of the eruption body in the gingival direction, or the thickness of the connecting part of the mesh hollow structure in the gingival direction is 0.1mm-0.5mm.

20. The integrated shell-shaped dental instrument according to claim 19, characterized in that, The length and / or width of the connecting part is 0.1mm-0.5mm.

21. The shell-shaped dental instrument according to claim 17, characterized in that, The inner diameter of the gap along the mesiodistal or gingival-maxillary direction is 0.5mm-1mm.

22. The integrated shell-shaped dental instrument according to claim 16, characterized in that, A pulling part is provided on the top wall of the sub-support part. The pulling part is integrally formed with the sub-support part. Pulling the pulling part can separate the sub-support part from the main body of the sprouting part.

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