Shell-shaped dental instrument

Abstract

The utility model relates to the technical field of shell-shaped dental appliance manufacturing, and discloses a shell-shaped dental appliance which comprises a shell-shaped body with a plurality of tooth accommodating cavities, an avoiding part is arranged between two adjacent tooth accommodating cavities and close to the gum end of the shell-shaped body, and the avoiding part is of a cavity structure communicated with the adjacent tooth accommodating cavities; wherein when the shell-shaped dental instrument is worn, the avoiding part covers the gingival papilla at the corresponding position, and a gap is formed between the inner surface of the avoiding part and the covered gingival papilla. Compared with the prior art, the avoiding part of the cavity structure is additionally arranged between the two adjacent tooth containing cavities in the shell-shaped dental instrument, the gingival papilla position is avoided, a gap is generated between the dental instrument and the gingival papilla after the dental instrument is worn, and the gingival papilla is not extruded; equivalently, in the gingival gap position, the wrapping of the orthodontic appliance on the teeth is hardly influenced, and the orthodontic force is hardly influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of manufacturing shell-shaped dental appliances, and particularly relates to a shell-shaped dental instrument Background Art

[0002] A shell-shaped dental appliance is an orthodontic appliance made of a safe elastic transparent polymer material. It has the advantages of being completely invisible during the correction process, good aesthetics, simple operation, and easy oral cleaning. Moreover, due to its transparent and aesthetic features, the correction process is almost completed without being noticed by others, and it has gradually become the first choice for orthodontic patients. During the production process of the shell-shaped dental appliance, it is necessary to first produce the patient's shell-shaped dental instrument, and through the lamination process, the film is tightly attached to the shell-shaped dental instrument by air pressure to obtain the corresponding shell-shaped dental appliance form

[0003] The correction principle of the shell-shaped dental appliance is that after wearing, it wraps around the tooth crown, and by utilizing the elastic deformation of the appliance material, the designed orthodontic force is applied to the teeth. The principle of biomechanics is used to correct the deformed teeth. By applying a gentle and lasting biological force through the correction system, the teeth are slowly moved to restore them to the normal position and align the teeth. However, during the correction treatment, the appliance is in a state of wrapping around the tooth crown. In order to ensure the application of sufficient force, the appliance should wrap around the entire part of the tooth crown as much as possible. In this way, the edge of the appliance will inevitably compress the gum, and the compressed position will cause gum swelling. Especially at the position of the gingival papilla, it will bulge further due to compression, causing discomfort. In addition, the appliance is designed with a correction force for the teeth. The highest point of the gingival papilla is at the highest position of the gingival line, and it is also more likely to be squeezed by the appliance together, generating a sense of compression and affecting the patient's willingness to wear Summary of the Utility Model

[0004] The purpose of the utility model is to provide a shell-shaped dental instrument, which can solve the problem that the shell-shaped dental instrument does not squeeze the gingival papilla during wearing, and reduce the extrusion of the gum as much as possible on the premise of ensuring the wrapping of the tooth crown

[0005] To achieve the above technical purpose, an embodiment of the utility model provides a shell-shaped dental instrument, including: a shell-shaped body having a plurality of tooth receiving cavities, and a relief portion is provided near the gingival end of the shell-shaped body between two adjacent tooth receiving cavities. The relief portion is a cavity structure communicating with the adjacent tooth receiving cavities. Wherein, when the shell-shaped dental instrument is worn, the relief portion covers the gingival papilla at the corresponding position, and there is a gap between the inner surface of the relief portion and the covered gingival papilla

[0006] In the embodiment of the present utility model, compared with the prior art, by adding an avoidance portion with a cavity structure between two adjacent tooth receiving cavities in the shell-shaped dental instrument, the position of the gingival papilla is avoided, resulting in a gap between the appliance and the gingival papilla after wearing, without squeezing the gingival papilla. Since the avoidance portion is arranged between two tooth receiving cavities, which is equivalent to the position of the gingival space, it hardly affects the wrapping of the teeth by the appliance and hardly affects the orthodontic force either.

[0007] Optionally, the horizontal interval between the mesial and distal boundaries of the avoidance portion gradually increases in the direction from the crown to the root of the tooth. Since the gingival papilla is generally triangular in shape, setting the horizontal interval between the mesial and distal boundaries to gradually increase in the direction from the crown to the root of the tooth can adapt to the approximate triangular shape of the avoidance portion, so that the shell-shaped dental instrument in this embodiment can hardly compress the gingiva after wearing.

[0008] Optionally, the horizontal interval between the labial-buccal-lingual boundaries of the avoidance portion gradually increases in the direction from the crown to the root of the tooth.

[0009] Optionally, the highest point of the avoidance portion in the direction from the crown to the root of the tooth is within the cervical 1 / 2 of the adjacent tooth crown. Since it is necessary to avoid the avoidance portion being too high, where there is no gingival papilla, there may be a gap between the tooth and the appliance, affecting the wrapping of the tooth. Therefore, limiting the highest point of the avoidance portion within the cervical 1 / 2 of the adjacent tooth crown can minimize the influence of the avoidance portion on the wrapping effect of the tooth.

[0010] Optionally, the height h1 of the avoidance portion in the anterior tooth area in the direction from the root to the crown is greater than the height h2 of the avoidance portion in the posterior tooth area in the direction from the root to the crown. Since the height of the gingival papilla in the anterior tooth area is generally greater than that in the posterior tooth area, designing an avoidance portion with a more suitable height can enable the avoidance portion to avoid the gingival papilla while preventing excessive occupation and affecting the foreign body sensation of the shell-shaped dental instrument after wearing.

[0011] Optionally, the width w1 of the avoidance portion in the labial-buccal-lingual direction is less than or equal to the width w2 of the adjacent tooth in the labial-buccal-lingual direction. When there are two adjacent teeth, the width w2 is taken as the width of the tooth with the smaller labial-buccal-lingual width among the two teeth.

[0012] Optionally, the w1 is greater than or equal to 1 / 2 of the w2.

[0013] Optionally, the avoidance portion is arranged on the labial-buccal side and / or the lingual side between two adjacent tooth receiving cavities in the same group. It is defined that the avoidance portion can be arranged on the labial-buccal side and / or the lingual side of the adjacent tooth space, enriching the position setting mode of the avoidance portion to be applicable to the dental arches of patients in different states.

[0014] Optionally, at least one first tooth receiving cavity is included in the plurality of tooth receiving cavities. The first tooth receiving cavity is designed to intrude teeth. The height of the avoidance part adjacent to the first tooth receiving cavity in the root-to-crown direction is greater than that of the avoidance part not adjacent to the first tooth receiving cavity. Since the gingival papilla may rise when intruding teeth, an avoidance part with more reserved space is provided to avoid being compressed due to the rising of the gingiva during the orthodontic treatment.

[0015] Optionally, at least one second tooth receiving cavity is included in the plurality of tooth receiving cavities. The second tooth receiving cavity is designed to move teeth palatally. The height of the avoidance part adjacent to the second tooth receiving cavity in the root-to-crown direction is greater than that of the avoidance part not adjacent to the second tooth receiving cavity. Since the gingival papilla may rise when moving teeth palatally, an avoidance part with more reserved space is provided to avoid being compressed due to the rising of the gingiva during the orthodontic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are illustrated by way of example in the accompanying drawings, which illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the figures in the drawings do not constitute a scale limitation.

[0017] Figure 1 is a perspective view of a shell-shaped dental instrument provided by an embodiment of the present invention;

[0018] Figure 2 is Figure 1 an enlarged view of part A in

[0019] Figure 3 is a schematic diagram of the positional relationship among the tooth receiving cavity, the avoidance part, and the gingival papilla after wearing the shell-shaped dental instrument provided by an embodiment of the present invention;

[0020] Figure 4 is a top view of the positional relationship between the tooth receiving cavity and the avoidance part on the shell-shaped dental instrument provided by an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of the avoidance part on the shell-shaped dental instrument provided by an embodiment of the present invention;

[0022] Figure 6a is a schematic diagram of the position at the 1 / 2 height of the neck in an embodiment of the present invention;

[0023] Figure 6b is a schematic diagram of the position at the 1 / 3 height of the neck in an embodiment of the present invention;

[0024] Figure 7It is a schematic cross-sectional view in the buccolingual direction of a shell-shaped dental instrument provided by another embodiment of the present utility model;

[0025] Figure 8 It is a schematic top view of the positional relationship between the tooth receiving cavity and the avoidance portion on the shell-shaped dental instrument provided by another embodiment of the present utility model. Specific embodiments

[0026] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will elaborate on each embodiment of the present utility model with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present utility model, many technical details are presented for the readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in each claim of the present application can still be implemented.

[0027] In the embodiments of the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0028] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to the specific circumstances.

[0029] In addition, the terms "installed", "set", "provided with", "opened", "connected", "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0030] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "a plurality" is two or more.

[0031] In each embodiment of the present application, the "anterior tooth area" and "posterior tooth area" mentioned are defined according to the classification of teeth on pages 36 - 38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including premolars and molars, teeth marked as 4 - 8 in the FDI notation, and teeth marked as 1 - 3 in the FDI notation in the anterior tooth area. The teeth in the anterior tooth area include central incisors, lateral incisors, and canines.

[0032] An embodiment of the present utility model provides a shell - shaped dental appliance, including: a shell - shaped body having a plurality of tooth receiving cavities, and a relief portion is provided near the gingival end of the shell - shaped body between two adjacent tooth receiving cavities, and the relief portion is a cavity structure communicating with the adjacent tooth receiving cavities; wherein, when the shell - shaped dental appliance is worn, the relief portion covers the gingival papilla at the corresponding position, and there is a gap between the inner surface of the relief portion and the covered gingival papilla. Compared with the prior art, by adding a relief portion with a cavity structure between two adjacent tooth receiving cavities in the shell - shaped dental appliance, the position of the gingival papilla is avoided, resulting in a gap between the appliance and the gingival papilla after wearing, without squeezing the gingival papilla. Since the relief portion is arranged between two tooth receiving cavities, it is equivalent to being at the gingival space position, hardly affecting the wrapping of the appliance around the teeth and hardly affecting the orthodontic force.

[0033] The implementation details of the shell - shaped dental appliance of the present utility model are specifically described below. The following content is only provided for convenience of understanding and is not necessary for implementing the solution.

[0034] A shell - shaped dental appliance provided by an embodiment of the present utility model is as Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, including: a shell - shaped body 10 having a plurality of tooth receiving cavities 11, and a relief portion 12 is provided near the gingival end of the shell - shaped body between two adjacent tooth receiving cavities 11, and the relief portion 12 is a cavity structure communicating with the adjacent tooth receiving cavities 11. Specifically, when the shell - shaped dental appliance is worn on the tooth crown 20, the relief portion 12 covers the gingival papilla 21 at the corresponding position, and there is a gap G between the inner surface of the relief portion 12 and the covered gingival papilla 21. Figures 2 - 4 Taking a group of two adjacent tooth receiving cavities (11a and 11b) as an example for illustration, a relief portion 12 is arranged between the tooth receiving cavity 11a and the tooth receiving cavity 11b. It can be understood that Figure 3In the middle, since the tooth receiving cavity is worn outside the tooth, there is a certain gap between the contour of the tooth and the tooth receiving cavity. However, in reality, the tooth receiving cavity generally wraps around the tooth, and there is a certain gap between the gingival papilla and the inner surface of the avoidance portion. In practical applications, due to the small size of the gingival papilla, the corresponding avoidance portion is also very small, so this gap may not be visible to the naked eye.

[0035] Combined with Figure 5 Continue to describe the shape of the avoidance portion. Figure 2 And Figure 5 In [reference], the X direction is the mesial direction. Figure 3 In [reference], the L1 direction is the direction from the crown to the root of the tooth. The horizontal interval between the mesial and distal boundaries of the avoidance portion 12 gradually increases in the direction from the crown to the root of the tooth. Along the L1 direction, the horizontal interval between the mesial and distal boundaries of the avoidance portion 12 gradually increases from T1 to T2. Since the gingival papilla is generally triangular in shape, setting the horizontal interval between the mesial and distal boundaries to gradually increase in the direction from the crown to the root of the tooth can adapt to the general triangular shape of the gingival papilla, so that the shell-shaped dental instrument in this embodiment will not press on the gingiva as much as possible after being worn. It is worth mentioning that in order to maintain the wrapping of the tooth by the tooth receiving cavity, when the avoidance portion 12 can avoid the gingival papilla 21, it is necessary to minimize the coverage of the tooth surface as much as possible. For example, Figure 3 The cross-sectional schematic diagram at the position of the interdental space in [reference] can show the avoidance portion. In addition, the avoidance portion 12 that adapts to the shape of the gingival papilla 21 can ensure the coverage of the gingival papilla on the one hand, accurately realize the avoidance of the gingival papilla, and on the other hand, can also minimize the size of the avoidance portion, so as to ensure the wrapping amount of the shell-shaped dental instrument on the tooth crown, and achieve a balance between avoiding the gingival papilla and maintaining the wrapping of the crown.

[0036] In some embodiments, such as Figure 3 shown, the highest point B of the avoidance portion in the direction from the crown to the root of the tooth is within the cervical 1 / 2 of the adjacent tooth crown. Since it is necessary to prevent the avoidance portion 12 from being too high, in the position where there is no gingival papilla 21, there may be a gap between the tooth 20 and the tooth receiving cavity 11, which affects the wrapping of the tooth. Therefore, limiting the highest point B of the avoidance portion 12 within the cervical 1 / 2 of the adjacent tooth crown can minimize the influence of the avoidance portion on the tooth wrapping effect. Specifically, the above-mentioned cervical 1 / 2 refers to the midpoint of the tooth crown part. Taking the tooth in Figure 6a as an example for illustration, the tooth is divided into two halves with the line g1 as the midline. The part within the cervical 1 / 2 refers to the part below the line g1. Correspondingly, the highest point of the avoidance portion is within the cervical 1 / 2 of the adjacent tooth crown, that is, the highest point of the avoidance portion should be below the g1 line. In some other embodiments, the highest point of the avoidance portion can also be limited within the cervical 1 / 3 of the adjacent tooth crown. Combined with Figure 6bAs shown, it is assumed that line g2 and line g3 trisect the tooth, and the part within the cervical 1 / 3 refers to the part below line g3. It can be understood that in other embodiments, other ranges can also be defined, which will not be listed one by one here.

[0037] In some embodiments, referring to Figure 1 As shown, the height h1 of the avoidance portion in the anterior tooth region in the root-to-crown direction is greater than the height h2 of the avoidance portion in the posterior tooth region in the root-to-crown direction. Since the height of the gingival papilla in the anterior tooth region is generally greater than that in the posterior tooth region, designing an avoidance portion with a more suitable height can enable the avoidance portion to avoid the gingival papilla while avoiding excessive occupation and affecting the foreign body sensation after wearing the shell-shaped dental appliance.

[0038] It should also be noted that in some embodiments, at least one first tooth receiving cavity is included in the multiple tooth receiving cavities. The first tooth receiving cavity is designed to depress the tooth, and the height of the avoidance portion adjacent to the first tooth receiving cavity in the root-to-crown direction is greater than that of the avoidance portion not adjacent to the first tooth receiving cavity. In this embodiment, the first tooth receiving cavity is taken as the tooth receiving cavity 11a for illustration. That is to say, the height H of the two avoidance portions adjacent to the tooth receiving cavity 11a on the left and right in the root-to-crown direction is greater. Since the gingival papilla may rise when depressing the tooth, a larger avoidance portion is reserved to avoid being compressed due to the rise of the gingiva during the orthodontic process.

[0039] In some embodiments, at least one second tooth receiving cavity is included in the multiple tooth receiving cavities. The second tooth receiving cavity is designed to move the tooth palatally, and the height of the avoidance portion adjacent to the second tooth receiving cavity in the root-to-crown direction is greater than that of the avoidance portion not adjacent to the second tooth receiving cavity. In this embodiment, the second tooth receiving cavity is taken as the tooth receiving cavity 11b for illustration. That is to say, the height H of the two avoidance portions adjacent to the tooth receiving cavity 11b on the left and right in the root-to-crown direction is greater. Since the gingival papilla may rise when moving the tooth palatally, a larger avoidance portion is reserved to avoid being compressed due to the rise of the gingiva during the orthodontic process.

[0040] It can be understood that the number of tooth receiving cavities in a shell-shaped body is related to the number of tooth rows. Therefore, although 16 tooth receiving cavities are taken as an example for illustration in the figure, in practical applications, it can also be 14, 12, etc., which will not be listed one by one here. Regarding the position of the avoidance portion, in some embodiments, it is arranged on the labial / buccal side. That is to say, the avoidance portion in the anterior tooth region is arranged on the labial side, and the avoidance portion in the posterior tooth region is arranged on the buccal side.

[0041] In addition, in this embodiment, an example is given where a relief portion is provided between any two tooth receiving cavities. It can be understood that in some other embodiments, the relief portion may also be provided only between some adjacent tooth receiving cavities, such as only between adjacent tooth receiving cavities in the anterior tooth region, or only between adjacent tooth receiving cavities in the posterior tooth region. Other forms are flexible and diverse, and will not be listed one by one here.

[0042] It is worth mentioning that the above-mentioned shell-shaped dental appliance can be manufactured by 3D direct printing or thermocompression methods to prepare a dental appliance designed by the dental appliance design method in the above-mentioned embodiment. Specifically, in this embodiment, the specific manufacturing process can use 3D printing to print the designed digital model of the shell-shaped dental appliance. This method prints during the printing stage without redundant processes and can obtain the product in one go, and the resulting shell-shaped dental appliance has good firmness. The additive manufacturing method in this embodiment can be SLA (stereolithography) printing or DLP (digital light processing) printing. In practical applications, other 3D printing technologies can also be used, which will not be listed one by one here.

[0043] In practical applications, the integral structure of the shell-shaped dental appliance can also be obtained by thermoforming technology. The specific thermoforming process generally includes: 3D printing based on the corresponding digital dental model and a series of intermediate digital dental models to produce a solid dental model, and then using a film to thermoform on the above solid dental model to obtain a shell-shaped dental appliance including the shape of teeth, and then cutting along the gingival line or adjacent to the gingival line on the shell-shaped dental appliance including the shape of teeth, so as to obtain a shell-shaped tooth appliance capable of accommodating teeth.

[0044] It can be seen that in the shell-shaped dental appliance of this embodiment, by adding a cavity structure relief portion between two adjacent tooth receiving cavities in the shell-shaped dental appliance to avoid the position of the gingival papilla, a gap is generated between the appliance and the gingival papilla after wearing, without squeezing the gingival papilla. Since the relief portion is provided between two tooth receiving cavities, it is equivalent to being in the gingival space position, hardly affecting the wrapping of the appliance around the teeth and hardly affecting the orthodontic force.

[0045] Another embodiment of the present utility model provides a shell-shaped dental appliance. This embodiment is substantially the same as the previous embodiment, and the main difference is that in the previous embodiment, the relief portion is only provided on the labial and buccal sides of adjacent tooth receiving cavities, while in this embodiment, the relief portion is provided on both the labial and buccal sides and the lingual side of adjacent tooth receiving cavities.

[0046] Combined with Figure 7 and Figure 8As shown in the figure, continue to take two adjacent tooth receiving cavities 11a and 11b as an example for illustration. Avoidance portions are provided on both the buccal side and the lingual side between the receiving cavity 11a and the receiving cavity 11b, and these two avoidance portions communicate with the tooth receiving cavity. In some embodiments, the horizontal interval of the buccal-lingual boundaries of the avoidance portion gradually increases in the direction from the crown to the root of the tooth, that is Figure 7 the w1' to w1 in

[0047] continue to illustrate, the width w1 of the avoidance portion in the buccal-lingual direction is less than or equal to the width w2 of the adjacent teeth in the buccal-lingual direction. When there are two adjacent teeth, the width in the buccal-lingual direction of the tooth with the smaller width in the buccal-lingual direction among the two teeth is used as the w2, Figure 8 as can be seen in

[0048] that the width of the tooth receiving cavity 11a in the buccal-lingual direction is smaller than that of the tooth receiving cavity 11b, so the width of the tooth receiving cavity 11b in the buccal-lingual direction is used as w2. In some embodiments, the w1 is greater than or equal to 1 / 2 of the w2, so as to avoid the width in the middle of the avoidance portion being too small and affecting the avoidance effect on the gingival papilla.

[0049] It can be understood that all the above feasible solutions can be arbitrarily combined without contradiction, and the specific combination method can be selected by those skilled in the art according to the actual situation under the teaching of the present invention, and no specific description is made here.

[0050] The above has introduced in detail the labeling device for the packaging line provided by the embodiment of the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the idea of the present invention, and there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A shell-shaped dental instrument, characterized in that: include: A shell-shaped body having a plurality of tooth receiving cavities, wherein an escape portion is provided between two adjacent tooth receiving cavities near the gingival end of the shell-shaped body, and the escape portion is a cavity structure connected to the adjacent tooth receiving cavities; wherein when the shell-shaped dental instrument is worn, the escape portion covers the gingival papilla at the corresponding position, and there is a gap between the inner surface of the escape portion and the covered gingival papilla.

2. The shell-shaped dental instrument according to claim 1, characterized in that: The horizontal interval of the mesiodistal boundaries of the avoidance portion gradually increases from the crown to the root.

3. The shell-shaped dental instrument according to claim 1, characterized in that: The horizontal interval of the labial, buccal and lingual boundaries of the avoidance portion gradually increases from the crown to the root.

4. The shell-shaped dental instrument according to claim 1, characterized in that: The highest point of the avoidance portion in the direction from the crown to the root is within the neck 1 / 2 of the crown of the adjacent tooth.

5. The shell-shaped dental instrument according to claim 1, characterized in that: The height of the avoidance portion located in the anterior tooth region in the direction from the tooth root to the tooth crown is greater than the height of the avoidance portion located in the posterior tooth region in the direction from the tooth root to the tooth crown.

6. The shell-shaped dental instrument according to claim 1, characterized in that: The labial, cheek and lingual width w1 of the avoidance portion is less than or equal to the labial, cheek and lingual width w2 of the adjacent tooth. When there are two adjacent teeth, the labial, cheek and lingual width of the tooth with the smaller labial, cheek and lingual width is used as w2.

7. The shell-shaped dental device according to claim 6, characterized in that: The w1 is greater than or equal to 1 / 2 of the w2.

8. The shell-shaped dental device according to any one of claims 1 to 7, characterized in that: The avoidance portion is arranged on the labial and buccal sides and / or the lingual sides between two adjacent tooth receiving cavities in the same group.

9. The shell-shaped dental device according to any one of claims 1 to 7, characterized in that: The multiple tooth receiving cavities include at least one first tooth receiving cavity, which is designed to lower the teeth, and the avoidance portion adjacent to the first tooth receiving cavity is greater in height from the root to the crown than the avoidance portion not adjacent to the first tooth receiving cavity.

10. The shell-shaped dental device according to any one of claims 1 to 7, characterized in that: The multiple tooth receiving cavities include at least one second tooth receiving cavity, which is designed for palatal movement of teeth, and the avoidance portion adjacent to the second tooth receiving cavity is greater in height from the root to the crown than the avoidance portion not adjacent to the second tooth receiving cavity.

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