Shell-shaped dental instrument, shell-shaped dental instrument system and kit

Abstract

The invention relates to the technical field of shell-shaped dental appliance manufacturing, and discloses a shell-shaped dental appliance which comprises a shell-shaped body provided with a plurality of tooth storage cavities, and jaw pads protruding towards the opposite jaw direction are arranged on the occlusal surfaces of the tooth storage cavities of at least part of the rear tooth area. The outer contour surface of the side, facing the opposite jaw, of the jaw pad is in concave-convex matching with the occlusal surface of the opposite jaw teeth corresponding to the jaw pad when the upper jaw and the lower jaw are in an occlusal state, a chewing auxiliary area is arranged on the side, facing the opposite jaw, of the jaw pad, and the chewing auxiliary area comprises one or more cambered surfaces protruding towards the opposite jaw. The invention further discloses a shell-shaped dental instrument system and a shell-shaped dental instrument set. According to the technical scheme, stable occlusion can be achieved through concave-convex matching of the occlusal surfaces, and the function of chewing food after wearing can be assisted through the cambered surfaces protruding towards the jaw.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing shell-shaped dental appliances, and particularly to a shell-shaped dental instrument, a shell-shaped dental instrument system and a set. Background Art

[0002] A shell-shaped dental appliance is an orthodontic appliance made of a safe elastic transparent polymer material, which has the advantages of being completely invisible during the correction process, good aesthetics, simple operation, and convenient oral cleaning, and has gradually become the first choice for orthodontic patients. During the application of the shell-shaped dental appliance, in order to specifically design the force application position or form, it is usually necessary to combine accessories for correction. The occlusal pad added to the occlusal surface of the teeth is a common accessory, which is widely used and can open the occlusion, contact occlusal interference, adjust the jaw position, etc.

[0003] In the prior art, the occlusal pad integrated with the appliance formed by thermoforming has the characteristics of convenient manufacturing and good integrity. When the patient wears the appliance and bites, the occlusal surface of the occlusal pad will first be contacted, and the occlusal surface of the occlusal pad has a tendency to deform downward under the pressure during occlusion, resulting in the collapse or flattening of the occlusal pad. Since the occlusal action is relatively frequent, the probability of damaging the occlusal pad is further increased. Therefore, the anti-deformation ability of the occlusal pad has always been a technical problem to be solved.

[0004] The inventors of the present application further found during the research on the structure of the appliance: (1) After the appliance is worn, usually the occlusal pad is higher than other areas of the appliance, and the occlusal pad contacts the opposing jaw earlier during the occlusal action and is more likely to be damaged; (2) The basic functions of the teeth include the function of chewing food, and currently the occlusal surface of the occlusal pad facing the opposing jaw is relatively flat, and its chewing function becomes weak; (3) During the occlusal action, the occlusal stroke in the occlusal pad area becomes shorter, which will further weaken the chewing ability. When the appliance is an appliance with an occlusal pad, the above defects are superimposed, resulting in the patient being almost unable to wear such an appliance during eating and having to frequently remove and wear it. This not only affects the accuracy of the appliance, but also causes trouble in wearing and affects the patient's willingness to wear. After the willingness to wear decreases, the correction effect will further decrease.

[0005] Currently, the design of the appliance with an occlusal pad only considers its position and shape, and does not consider the design of other functions. During actual wearing, the above problems are all important factors affecting the wearing effect and willingness of the patient, so they all need to be studied and solved. Summary of the Invention

[0006] The purpose of the present invention is to provide a shell-shaped dental instrument, a shell-shaped dental instrument system and a set used as a mold for a thermoformed shell-shaped dental appliance, which can achieve stable occlusion through the concavo-convex matching of the occlusal surface, and can also assist the chewing function of food after wearing through the arc surface protruding towards the opposing jaw.

[0007] To solve the above technical problems, an embodiment of the present invention provides a shell-shaped dental instrument, including a shell-shaped body provided with a plurality of tooth receiving cavities. The occlusal surface of at least part of the tooth receiving cavities in the posterior tooth area is provided with a jaw pad protruding towards the opposing jaw. The outer contour surface of the jaw pad facing the opposing jaw is concavo-convexly matched with the occlusal surface of the opposing teeth corresponding to the jaw pad when the upper and lower jaws are in the occlusal state. The side of the jaw pad facing the opposing jaw is provided with a chewing assistance area, and the chewing assistance area includes one or more arc surfaces protruding towards the opposing jaw.

[0008] Compared with the prior art, the embodiment of the present invention improves the shape of the existing jaw pad. Specifically, the outer contour surface of the jaw pad facing the opposing jaw is designed with concavo-convexity, so as to achieve concavo-convex matching with the occlusal surface of the opposing teeth when the upper and lower jaws are in the occlusal state. At the same time, a chewing assistance area including one or more arc surfaces protruding towards the opposing jaw is newly provided on the side of the jaw pad facing the opposing jaw. By using the characteristic that the arc surface has strong anti-deformation ability, the anti-deformation ability of this position is increased. In addition, when chewing food, since the food crushing ability on the surface of the jaw pad is increased and the occlusal pressure is increased, the patient's chewing is not affected during the wearing state, and the wearing duration of the patient can be extended. It can be seen that the occlusal side contour of the jaw pad is determined according to the occlusal surface of the corresponding teeth to ensure stable occlusion during wearing, and at the same time, the occlusal pressure of the jaw pad during chewing is enhanced, so as to improve the patient's food chewing ability after wearing the orthodontic appliance with the jaw pad, thereby enhancing the patient's wearing willingness.

[0009] Optionally, the radius of curvature of the point on the arc surface closest to the opposing jaw in the vertical upward direction is within a preset range, and the preset range is determined according to the occlusal surface of the teeth corresponding to the jaw pad when the upper and lower jaws are in the occlusal state. This embodiment limits the radius of curvature of the highest point on the arc surface determined according to the occlusal surface of the teeth corresponding to the jaw pad when the upper and lower jaws are in the occlusal state. Since when the jaw pad contacts an external object, generally the highest point contacts first and the stress at the contact position is more concentrated, so limiting the radius of curvature of this position within the preset range can strengthen the anti-deformation ability of the area where the stress is more concentrated.

[0010] Optionally, the preset range is 0.2 mm - 0.8 mm. A smaller range of the radius of curvature is limited to ensure that the occlusal pressure on the occlusal surface of the jaw pad meets the requirements.

[0011] Optionally, the radius of curvature is: the principal radius of curvature, the Gaussian radius of curvature or the mean radius of curvature. Several types of radii of curvature during the implementation of the solution are clarified, which is convenient for the implementation of the solution.

[0012] Optionally, the arc surface is a partial spherical surface or a partial ellipsoidal surface. By adopting a symmetric spherical surface or ellipsoidal surface, while having good anti-deformation ability, the design difficulty is reduced, and the design speed of the shell-shaped dental instrument in this application is accelerated.

[0013] Optionally, the arc surface is less than or equal to 1 / 2 of a spherical surface or 1 / 2 of an ellipsoidal surface. Defining the arc surface to be less than or equal to 1 / 2 of a spherical surface or 1 / 2 of an ellipsoidal surface can avoid the generation of undercut structures between the arc surface and the adjacent structure, which is not conducive to the removal and wearing of the orthodontic appliance.

[0014] Optionally, the height of the point on the arc surface closest to the opposing jaw in the vertical upward direction does not exceed the occlusal surface of the teeth corresponding to the occlusal pad when the upper and lower jaws are in the occlusal state. Defining the height of the arc surface in the vertical direction not to exceed the occlusal surface of the teeth corresponding to the occlusal pad can avoid occlusal interference.

[0015] Optionally, the shape of the outer contour of the occlusal pad facing the opposing jaw is determined according to the occlusal surface of the teeth corresponding to the occlusal pad. Defining the clear source of the shape of the outer contour of the occlusal pad facing the opposing jaw facilitates the realization of a contour shape that matches the concavities and convexities of the opposing jaw.

[0016] Optionally, the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the teeth in the tooth position where the occlusal pad is located; or, the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the opposing teeth in the tooth position where the occlusal pad is located; or, when the shell-shaped dental appliance corresponds to a treatment plan, the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad is located in the treatment plan. Three determination methods for the shape of the outer contour of the occlusal pad facing the opposing jaw are clarified, which can speed up the design of the contour shape while ensuring the matching of concavities and convexities with the opposing jaw.

[0017] Optionally, the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the teeth in the tooth position where the occlusal pad is located; or, the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the opposing teeth in the tooth position where the occlusal pad is located; or, when the shell-shaped dental appliance corresponds to a treatment plan, the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad is located in the treatment plan. Another three determination methods for the shape of the outer contour of the occlusal pad facing the opposing jaw are clarified, which can speed up the design of the contour shape while ensuring the matching of concavities and convexities with the opposing jaw.

[0018] Optionally, the occlusal pad covers at least two teeth, and the outer contour surface of the occlusal pad facing the opposing jaw includes at least two occlusal areas, each occlusal area corresponding to one tooth respectively, wherein the outer contour surface of the occlusal area is formed by scaling the occlusal surface of the corresponding tooth. When the occlusal pad covers multiple teeth, the contour surface can be formed by scaling the occlusal surfaces of the corresponding covered teeth, further ensuring the matching of the obtained occlusal pad structure with the concavities and convexities of the opposing jaw.

[0019] Optionally, each occlusal area is 0.5 - 0.9 times the occlusal surface of the corresponding tooth, further defining the scaling ratio of the occlusal surface. Moreover, the bending degree of the occlusal surface generated by the shrinking method becomes larger, further enhancing the anti-deformation ability of the occlusal surface.

[0020] Optionally, when there are multiple arc surfaces, the vertical heights of the multiple arc surfaces are inconsistent. Defining the inconsistent heights of the multiple arc surfaces enables the distances at which the multiple arc surfaces contact external objects during chewing to be inconsistent, enhancing the chewing effect.

[0021] Optionally, the chewing assistance area is arranged corresponding to the dental fossa of the opposing target tooth. Since the dental fossa area is located in the middle of the tooth and is a concave structure during chewing, food will naturally approach the dental fossa area. Therefore, defining that the chewing assistance area corresponds to the dental fossa of the opposing target tooth is more conducive to the chewing assistance area's help with the chewing function.

[0022] Optionally, the occlusal splint covers at least two teeth, and the chewing assistance area is correspondingly arranged at the position of the adjacent tooth gap. Since according to the general upper and lower jaw correspondence relationship, the adjacent tooth gap in the posterior tooth area generally corresponds to the more convex position of the opposing tooth and is more likely to contact food. Therefore, arranging the chewing assistance area at the adjacent tooth gap can increase the chewing ability of this area.

[0023] Optionally, the length of the occlusal splint in the mesiodistal direction is within the range of tooth positions 4 - 6. In orthodontic appliances for opening occlusion, relieving interferences, and adjusting jaw relationships, the occlusal splint is usually designed in the posterior tooth area. Defining the design range of the occlusal splint within the range of teeth 4 - 6 in the posterior tooth area can avoid interfering with the occlusion when set on tooth 7.

[0024] An embodiment of the present invention also provides a shell-shaped dental appliance system, including a series of shell-shaped dental appliances designed to gradually adjust multiple teeth from a first layout to a second layout. At least multiple of the above-mentioned shell-shaped dental appliances are included in the series of shell-shaped dental appliances. Among them, the height of the occlusal splint satisfies that the occlusal splint in at least one shell-shaped dental appliance with a later implementation time is lower in height than the occlusal splint at the same position in the shell-shaped dental appliance with an earlier implementation time.

[0025] Optionally, the series of shell-shaped dental appliances, which are designed to gradually adjust multiple teeth from a first layout to a second layout, respectively reduce the height of the occlusal splint at the same position in the series of shell-shaped dental appliances by a gradually decreasing design method according to the sequence of implementation time.

[0026] Embodiments of the present invention also provide a shell-shaped dental instrument set, including a first shell-shaped dental instrument and a second shell-shaped dental instrument respectively for accommodating maxillary teeth and mandibular teeth, and the first shell-shaped dental instrument and / or the second shell-shaped dental instrument are respectively the above-mentioned shell-shaped dental instruments; wherein, the occlusal pad of the first shell-shaped dental instrument includes a first acting surface, and the occlusal pad of the second shell-shaped dental instrument includes a second acting surface. When the first acting surface and the second acting surface interact with each other, they guide the movement of the mandibular dentition to adjust the intermaxillary relationship between the maxillary teeth and the mandibular teeth.

[0027] Optionally, when the shell-shaped dental instrument set is used to guide the forward movement of the mandibular dentition, the mesial side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the distal side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the distal side of the occlusal pad of the second shell-shaped dental instrument; when the shell-shaped dental instrument set is used to guide the backward movement of the mandibular dentition, the distal side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the mesial side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the mesial side of the occlusal pad of the second shell-shaped dental instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are illustrated by way of example in the accompanying drawings, and these exemplary illustrations do not limit 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.

[0029] Figure 1 is a schematic diagram of the wearing of the shell-shaped dental instrument provided by an embodiment of the present invention;

[0030] Figure 2 is a three-dimensional schematic diagram of the shell-shaped dental instrument provided by an embodiment of the present invention;

[0031] Figure 3 is Figure 1 a partial enlarged view of part A in

[0032] Figure 4 is a schematic diagram of the concave-convex matching form in an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of another concave-convex matching form in an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the wearing of another shell-shaped dental instrument provided by an embodiment of the present invention;

[0035] Figure 7 It is a schematic diagram of mechanical analysis of shape stress experiment provided by another embodiment of the present invention;

[0036] Figure 8 It is another schematic diagram of mechanical analysis of shape stress experiment provided by another embodiment of the present invention;

[0037] Figure 9 It is a flowchart of a method for generating a three-dimensional digital model of dental arch involved in the manufacturing of a shell-shaped dental instrument provided by another embodiment of the present invention;

[0038] Figure 10 It is a schematic diagram of tooth scaling in the method for generating a three-dimensional digital model of dental arch provided by another embodiment of the present invention;

[0039] Figure 11 It is a schematic diagram of height confirmation in the method for generating a three-dimensional digital model of dental arch provided by another embodiment of the present invention;

[0040] Figure 12 It is a schematic diagram of ellipsoid confirmation in the method for generating a three-dimensional digital model of dental arch provided by another embodiment of the present invention;

[0041] Figure 13 It is a three-dimensional schematic diagram of a shell-shaped dental instrument provided by another embodiment of the present invention. Detailed Embodiment

[0042] To make the objectives, technical solutions and advantages of the present invention clearer, the following will elaborate on each embodiment of the present invention with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present invention, many technical details are provided to help readers 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 achieved.

[0043] In the embodiments of the present invention, 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 invention 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.

[0044] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate 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 invention can be understood according to specific circumstances.

[0045] In addition, the terms "mounted", "arranged", "provided with", "opened", "connected", "linked" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components or parts (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, components or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0047] In this application, the "anterior tooth region" and "posterior tooth region" mentioned in each embodiment 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 numbered 4-8 shown by the FDI notation, and teeth numbered 1-3 shown by the FDI notation in the anterior tooth region. The teeth in the anterior tooth region include central incisors, lateral incisors and canines.

[0048] As a dental medical device for correcting tooth deformities, compared with wire-type tooth appliances, the shell-shaped tooth appliance will not affect the appearance of human teeth during the orthodontic process. Moreover, the shell-shaped tooth appliance has no risk of stabbing the surrounding parts of human teeth and is also convenient for maintaining oral hygiene. Therefore, the shell-shaped tooth appliance has attracted more and more attention from oral medicine professionals. The inventors of this application found in the research on the structure of the shell-shaped tooth appliance that the patient's willingness to wear will directly affect the orthodontic effect, and the comfort and functionality after wearing the appliance are directly related to the patient's willingness to wear. After in-depth research on the structure of the shell-shaped dental appliance with a jaw pad, the inventors of this application found that although in order to improve the orthodontic effect, doctors will require patients to keep wearing the appliance continuously, but the protruding jaw pad is easily flattened and damaged after wearing, and the chewing function also deteriorates. Therefore, patients generally take off the appliance when chewing food, resulting in the inability to wear it during the chewing period.

[0049] In view of the above technical problems, the present invention provides a shell-shaped dental instrument, which includes a shell-shaped body provided with a plurality of tooth receiving cavities. The occlusal surface of the tooth receiving cavities in at least part of the posterior tooth area is provided with a jaw pad protruding towards the opposing jaw. The outer contour surface of the jaw pad facing the opposing jaw is concavo-convexly matched with the occlusal surface of the opposing teeth corresponding to the jaw pad when the upper and lower jaws are in the occlusal state. The jaw pad facing the opposing jaw is provided with a chewing assistance area, and the chewing assistance area includes one or more arc surfaces protruding towards the opposing jaw. Compared with the prior art, the shape of the existing jaw pad is improved. Specifically, the outer contour surface of the jaw pad facing the opposing jaw is designed with concavo-convexity, so as to achieve concavo-convex matching with the occlusal surface of the opposing teeth when the upper and lower jaws are in the occlusal state. At the same time, a chewing assistance area including one or more arc surfaces protruding towards the opposing jaw is newly arranged on the side of the jaw pad facing the opposing jaw. By using the characteristic that the arc surface has strong anti-deformation ability, the anti-deformation ability of this position is increased. In addition, when chewing food, due to the increased ability of the jaw pad surface to break food and the increased occlusal pressure, the patient's chewing is not affected during the wearing state, and the wearing duration of the patient can be extended. It can be seen that the occlusal side contour of the jaw pad is determined according to the occlusal surface of the corresponding teeth to ensure stable occlusion during wearing. At the same time, the occlusal pressure of the jaw pad during chewing is enhanced, and the food chewing ability of the patient after wearing the orthodontic appliance with the jaw pad is improved, thereby enhancing the patient's willingness to wear.

[0050] The implementation details of the shell-shaped dental instrument of the present invention will be specifically described below. The following content is only the implementation details provided for convenient understanding and is not necessary for implementing this application.

[0051] As Figure 1 、 Figure 2 and Figure 3 shown, the shell-shaped dental instrument 1 provided in the first embodiment of the present invention includes a shell-shaped body 10 provided with a plurality of tooth receiving cavities, which is used to be worn on the upper dental arch 2 of the patient to adjust the patient's dental arch to an ideal position. Figure 1 The corresponding lower dental arch 3 of the patient and the shell-shaped dental instrument 30 worn on the lower dental arch 3 are also shown.

[0052] Specifically, the occlusal surface of the tooth receiving cavities in at least part of the posterior tooth area is provided with a jaw pad 20 protruding towards the opposing jaw. For example, the jaw pad 20 is provided on three teeth in the posterior tooth area. The outer contour surface 201 of the jaw pad 20 facing the opposing jaw is concavo-convexly matched with the occlusal surface 301 of the opposing teeth corresponding to the jaw pad 20 when the upper and lower jaws are in the occlusal state. The jaw pad 20 facing the opposing jaw is provided with a chewing assistance area 2011, and the chewing assistance area 2011 includes one or more arc surfaces protruding towards the opposing jaw. In this embodiment, the dental arch includes teeth No. 1-6, and the jaw pad 20 is provided on teeth No. 4-6, which are all the teeth in the posterior tooth area.

[0053] It should be noted that since the occlusal surface of the teeth is not a flat surface, the above-mentioned concave-convex matching may refer to setting the outer contour surface 201 on the side of the occlusal pad 20 facing the opposing jaw as a curved surface corresponding to the concave-convex surface 301 of the opposing jaw. Specifically, it can be a surface with completely corresponding concavities and convexities as shown in Figure 4 , or a surface that is roughly similar as shown in Figure 5 . For the surface with the chewing assistance area 2011, its overall contour (schematically shown by the dashed line in the figure) is roughly the same as the contour of the corresponding surface. It can be understood that the above-mentioned concave-convex matching between the surfaces is not an absolute coincidence, but a corresponding similarity, and the concave-convex matching within the allowable range of manufacturing process errors.

[0054] Furthermore, referring to Figure 3 , in this embodiment, the radius of curvature of the arc surface at the point C closest to the opposing jaw in the vertical upward direction is within a preset range, and the preset range is determined according to the occlusal surface of the teeth corresponding to the occlusal pad 20 when the upper and lower jaws are in the occlusal state. This embodiment defines that the arc surface is determined according to the occlusal surface of the teeth corresponding to the occlusal pad 20 when the upper and lower jaws are in the occlusal state, and the radius of curvature of the highest point on the arc surface is within a certain range. Since when the occlusal pad 20 contacts an external object, the highest point contacts first and the stress at the contact position is more concentrated, so limiting the radius of curvature at this position within the preset range can enhance the anti-deformation ability of the area where the stress is more concentrated. Optionally, the above preset range is 0.2 mm - 0.8 mm, and a smaller range of the radius of curvature is defined to ensure that the occlusal pressure of the occlusal surface of the occlusal pad 20 meets the requirements. Specifically, the above radius of curvature can be: the principal radius of curvature, the Gaussian radius of curvature, or the mean radius of curvature. Clearly defining several types of radius of curvature when implementing the solution facilitates the implementation of the solution. In this embodiment, the principal radius of curvature is specifically used as the radius of curvature, which can better express the degree of curvature at this position.

[0055] Continuing the description, the arc surface in this embodiment is a partial spherical surface, specifically it can be less than or equal to 1 / 2 of the spherical surface, and a symmetric spherical surface is adopted. While having good anti-deformation ability, it reduces the design difficulty and can also speed up the design speed of the shell-shaped dental instrument in this application. Further limiting the arc surface to be less than or equal to 1 / 2 of the spherical surface can avoid the generation of undercut structures between the arc surface and the adjacent structure, and avoid the problem of difficult removal and wearing of the orthodontic appliance. It can be understood that although the spherical surface is taken as an example in the above embodiment, in actual applications, a partial ellipsoidal surface can also be used as the arc surface in the above embodiment, and its size can be further limited to be less than or equal to 1 / 2 of the ellipsoidal surface, and its type can be set according to actual needs and will not be limited here.

[0056] Continuing to refer to Figure 3, in some embodiments, the height of the above-mentioned arc surface relative to the highest vertex C of the present jaw is H1, and the height of the corresponding occlusal surface of the opposing jaw relative to the present jaw is H2, where H1 ≤ H2. That is to say, the height of the above-mentioned arc surface at the point closest to the opposing point C in the vertical upward direction does not exceed the occlusal surface of the teeth corresponding to the occlusal pad 20 when the upper and lower jaws are in the occlusal state. Limiting the height of the arc surface in the vertical direction not to exceed the occlusal surface of the teeth corresponding to the occlusal pad 20 can avoid occlusal interference.

[0057] Furthermore, the shape of the outer contour of the occlusal pad 20 facing the opposing jaw is determined according to the occlusal surface of the teeth corresponding to the occlusal pad 20. Defining the clear source of the shape of the outer contour of the occlusal pad 20 facing the opposing jaw facilitates the realization of a contour shape that matches the concavities and convexities of the opposing jaw. Specifically, when the upper and lower jaws are in the occlusal state, the occlusal surface of the teeth corresponding to the occlusal pad 20 can be, in some embodiments, the occlusal surface of the teeth covered by the occlusal pad 20. In other embodiments, it can also be the occlusal surface of the opposing teeth of the teeth covered by the occlusal pad 20. In other embodiments with a treatment plan designed, it can also be the occlusal surface of the opposing teeth determined according to the adjusted relationship in the treatment plan for the teeth covered by the occlusal pad 20. Its determination forms are rich and can be selected according to actual needs, and will not be listed one by one here.

[0058] Furthermore, in the present embodiment, the outer contour surface of the occlusal pad 20 facing the opposing jaw is the occlusal surface of the teeth in the tooth position where the occlusal pad 20 is located. It can be understood that in addition to the above-mentioned method of confirming the contour surface, the outer contour surface of the occlusal pad 20 facing the opposing jaw can also be the occlusal surface of the opposing teeth in the tooth position where the occlusal pad 20 is located in other embodiments; or, when the shell-shaped dental instrument corresponds to a treatment plan, the outer contour surface of the occlusal pad 20 facing the opposing jaw can also be the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad 20 is located in the treatment plan. Clearly defining three determination methods for the shape of the outer contour of the occlusal pad 20 facing the opposing jaw can speed up the design speed of the contour shape on the premise of ensuring the matching of concavities and convexities with the opposing jaw.

[0059] It should be noted that in addition to the above method of directly using the relevant occlusal surface as the contour surface of the occlusal pad 20 facing the opposing jaw, the outer contour surface of the occlusal pad 20 facing the opposing jaw can also be formed by scaling the occlusal surface of the teeth in the tooth position where the occlusal pad 20 is located; or, the outer contour surface of the occlusal pad 20 facing the opposing jaw can also be formed by scaling the occlusal surface of the opposing teeth in the tooth position where the occlusal pad 20 is located; or, when the shell-shaped dental instrument corresponds to a treatment plan, the outer contour surface of the occlusal pad 20 facing the opposing jaw can also be formed by scaling the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad 20 is located in the treatment plan. Clearly defining three other determination methods for the shape of the outer contour of the occlusal pad 20 facing the opposing jaw can speed up the design speed of the contour shape on the premise of ensuring the matching of concavities and convexities with the opposing jaw.

[0060] Furthermore, in this embodiment, the occlusal pad 20 covers at least two teeth. The outer contour surface of the occlusal pad 20 facing the opposing jaw includes at least two occlusal areas, each occlusal area corresponding to one tooth respectively. Among them, the outer contour surface of the occlusal area is formed by scaling the occlusal surface of the corresponding tooth. When the occlusal pad 20 covers multiple teeth, the contour surface can be formed by scaling according to the occlusal surfaces of the corresponding covered teeth, further ensuring the structural matching between the obtained occlusal pad 20 and the convex and concave of the opposing jaw. Specifically, each occlusal area is 0.5 - 0.9 times the occlusal surface of the corresponding tooth, further defining the scaling ratio of the occlusal surface. Moreover, the bending degree of the occlusal surface generated by the shrinking method becomes larger, further enhancing the anti-deformation ability of the occlusal surface. It can be understood that although the occlusal pad 20 covering two teeth is taken as an example in this embodiment, in practical applications, it can also cover three teeth, and the limitation of the covering position does not affect the core concept of the present invention.

[0061] Optionally, the occlusal pad 20 covers at least two teeth, and the chewing assistance area 2011 is correspondingly arranged at the position of the interdental space. Due to the general upper and lower jaw correspondence relationship, the interdental space in the posterior tooth area generally corresponds to the relatively convex position of the opposing teeth, and it is easier to contact food. Therefore, setting the chewing assistance area 2011 in the interdental space can increase the chewing ability of this area.

[0062] It can be understood that the above-mentioned chewing assistance area 2011 can further correspond to the tooth fossa of the opposing target tooth (not shown in the figure). Since when chewing food, the tooth fossa area is located in the middle of the tooth and is a concave structure, the food will naturally approach the tooth fossa area. Therefore, defining the chewing assistance area 2011 to correspond to the tooth fossa of the opposing target tooth is more conducive to the chewing assistance area 2011 to help with the chewing function.

[0063] It can be understood that the above embodiment takes the dental arch including teeth No. 1 - 6 as an example. In other embodiments (see Figure 13 ), when the dental arch can include teeth No. 1 - 7, only the posterior tooth area part of the occlusal pad 20 is set on teeth No. 4 - 6. It can be understood that the above embodiment takes the shell-shaped dental appliance worn on the patient's upper jaw as an example. In practical applications, the above structure can also be applied to the shell-shaped dental appliance worn on the patient's lower jaw, which is not limited herein.

[0064] It should also be noted that the chewing assistance area 2011 shown in the above embodiment is a convex arc surface facing the opposing jaw and corresponds to the position of the interdental space. In practical applications, see Figure 6, the number of the arc surfaces can be multiple, and the setting position can also be in the area corresponding to the occlusal surface of the corresponding tooth. The chewing assistance area 2011 exemplified in this figure includes an arc surface 2011a corresponding to the adjacent tooth space and two arc surfaces 2011b corresponding to the occlusal surface of the tooth. Further, when there are multiple arc surfaces, the heights of the multiple arc surfaces are inconsistent in the vertical upward direction. Defining that the heights of the multiple arc surfaces are inconsistent, so that the distances of the multiple arc surfaces contacting external objects during chewing are inconsistent, can increase the chewing effect.

[0065] Regarding the research on the pressure-bearing capacity of the arc surface, the inventor of the present application conducted experimental verification. Taking a flat plate and an ellipsoidal shell with the same thickness, a horizontal pressure of 100 N was applied to the center respectively. After applying a horizontal pressure of 100 N to the center of the flat plate structure, as Figure 7 shown Figure 7 shows the deformation of the flat plate structure under pressure. The force analysis diagram corresponding to the cross-section of the structure is shown in the frame. Figure 7 In Figure 8 shown Figure 8 , the directions of the out-of-plane stresses at five points on the flat plate structure are exemplified by the directions of the arrows f1 to f5, and the lengths of the arrows f1 to f5 represent the magnitudes of the out-of-plane stresses. After applying a horizontal pressure of 100 N to the center of the ellipsoidal shell structure, as Figure 7 and Figure 8 shown

[0066] , the directions of the out-of-plane stresses at six points on the ellipsoidal shell structure are exemplified by the directions of the arrows F1 to F6, and the lengths of the arrows F1 to F6 represent the magnitudes of the out-of-plane stresses. Through the comparison between Figure 7 it can be seen that after the ellipsoidal shell or spherical shell bears external forces of the same magnitude and direction, part of the stress is converted into in-plane stress, and the remaining out-of-plane stress is smaller, and the deformation of the ellipsoidal shell is smaller than that of the flat plate structure. It can be seen that smaller out-of-plane stress will result in smaller bending, and thus it is less likely to undergo buckling deformation. Therefore, the ellipsoidal shell structure is usually used more in components that bear pressure. In addition, the added ellipsoidal or spherical support can increase the contact points of occlusion. The ellipsoidal shell has higher compressive capacity compared to the occlusal pad 20 with a flat contact position when subjected to vertical loads. Due to the smaller curvature at the top of the spherical shell, it can also play a role in crushing food together with the opposing teeth.

[0066] In summary, compared with the prior art, the present embodiment improves the shape of the existing jaw pad. Specifically, the outer contour surface of the jaw pad facing the opposing jaw is designed with concavities and convexities, so as to achieve the concavity-convex matching with the occlusal surface of the opposing teeth when the upper and lower jaws are in the occlusal state. At the same time, a chewing assistance area including one or more arc surfaces protruding towards the opposing jaw is newly provided on the side of the jaw pad facing the opposing jaw. By utilizing the strong anti-deformation ability of the arc surface, the anti-deformation ability at this position is increased. In addition, when chewing food, since the food crushing ability on the surface of the jaw pad is increased and the occlusal pressure is increased, the patient's chewing is not affected in the wearing state, and the wearing duration of the patient can be extended. It can be seen that the occlusal side contour of the jaw pad is determined according to the occlusal surface of the corresponding teeth to ensure stable occlusion during wearing. At the same time, the occlusal pressure of the jaw pad during chewing is enhanced, and the food chewing ability of the patient after wearing the orthodontic appliance with the jaw pad is improved, thereby enhancing the patient's wearing willingness.

[0067] The present application provides an embodiment, which relates to a shell-shaped dental appliance. This embodiment is similar to the first embodiment. In the first embodiment, a spherical surface is used as the arc surface protruding towards the opposing jaw on the chewing assistance area, while in this embodiment, an ellipsoidal surface is used as the arc surface protruding towards the opposing jaw on the chewing assistance area. It can be seen that the shape of the arc surface is flexible and changeable, and can be selected according to different needs to adapt to a wider range of application scenarios.

[0068] It can be understood that the shell-shaped dental appliances in the above embodiments can be manufactured by different processes. One can be obtained through the 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 obtaining a shell-shaped dental appliance including the tooth shape by thermoforming a film on the above solid dental model, and then cutting along or adjacent to the gingival line on the shell-shaped dental appliance including the tooth shape, so as to obtain a shell-shaped tooth orthodontic appliance capable of accommodating teeth.

[0069] Furthermore, based on the thermoforming technology, to manufacture the above shell-shaped dental appliance, it is necessary to pre-design a three-dimensional digital model of the dental arch, and then print out the corresponding dental arch model with a jaw pad according to the three-dimensional digital model, so as to obtain the above shell-shaped dental appliance with a jaw pad during thermoforming. Taking the jaw pad covering three teeth and setting 2 ellipsoidal chewing assistance areas respectively in the adjacent tooth spaces as an example, combined with Figure 9 , the specific generation method of the three-dimensional digital model of the dental arch is described:

[0070] In step 901, a computer device capable of generating a dental model acquires the height of the occlusal splint and the three-dimensional digital dental model. Here, the three-dimensional digital dental model is a digitized three-dimensional model generated by collecting the dental data of the patient, which includes various parameters of the patient's teeth and three-dimensional views of the upper / lower dental arches. The height of the occlusal splint determines the height of the occlusal splint generated based on this dental model, and this height of the occlusal splint can be preset or obtained through calculation.

[0071] In one example, the method for calculating the height of the occlusal splint can be: calculating the height of the occlusal splint based on the occlusal surface of the teeth in the three-dimensional digital dental model and the occlusal surface of the corresponding teeth in the contralateral dental model data corresponding to the three-dimensional digital dental model. In a more detailed example, it can be to first select a calibration point on the occlusal surface of the teeth in the three-dimensional digital dental model; then determine the projection point generated by the calibration point on the occlusal surface of the corresponding teeth in the contralateral dental model data along the normal direction of the occlusal plane in the occlusal state of the teeth; and then calculate the height of the occlusal splint based on the height of this calibration point and the projection point corresponding to the calibration point. In the step of determining the calibration point corresponding to the teeth in the three-dimensional digital dental model in the above process, the calibration point corresponding to the teeth in the three-dimensional digital dental model can be determined according to the occlusal physiological characteristics. Considering that some patients actually cannot occlude accurately, the occlusal physiological characteristics include the principle of cusp-fossa alignment in medicine. Combining this point to determine the calibration point can make the selection of the dental calibration point more reasonable. Further, when the teeth in the three-dimensional digital dental model are maxillary teeth, the calibration point corresponding to the teeth in the three-dimensional digital dental model can be determined in the area near the lingual side according to the occlusal physiological characteristics; when the teeth in the three-dimensional digital dental model are mandibular teeth, the calibration point corresponding to the teeth in the three-dimensional digital dental model can be determined in the area near the buccal side according to the occlusal physiological characteristics. This further makes the selection of the calibration point more reasonable and thus obtains a more appropriate height of the occlusal splint.

[0072] In step 902, a computer device capable of generating a dental model generates three protrusions 91 at a specified position on the three-dimensional digital dental model according to the height of the occlusal splint and the three-dimensional digital dental model. There are many ways to generate the protrusions 91. In one example, the tooth model at the specified position on the three-dimensional digital dental model can be determined first; and then at least two protrusions 91 are generated at the specified position on the three-dimensional digital dental model according to the height of the occlusal splint and the shape and size of the tooth model. The generated protrusions 91 combine the anatomical characteristics of the teeth themselves and are less likely to deform.

[0073] In one example, the protrusions 91 of a certain type can be directly generated based on the patient's teeth. For example, after determining the tooth model at a specified position of the three-dimensional digital dental model, the tooth model at the specified position in the three-dimensional digital dental model is directly scaled to obtain a scaled tooth model; then, the height of the scaled tooth model is adjusted according to the height of the occlusal pad to obtain an adjusted tooth model; the protrusions 91 are generated based on the adjusted tooth model and the three-dimensional digital dental model. When scaling the tooth model at the specified position in the three-dimensional digital dental model (in this embodiment, three teeth in the scaled tooth area are used as an example for illustration, and other positions and numbers of teeth can be set in actual applications, which will not be listed one by one here), the scaling ratio can be set between 0.5 and 0.9 to achieve better results (in this embodiment, a scaling ratio of 0.8 is used as an example for display, and other values can be set in actual applications, which will not be listed one by one here). The effect of scaling is as Figure 10 shown, Figure 10 It can be clearly seen in that the overall scaled tooth model A' is smaller than the unscaled tooth model A, but the shape remains unchanged. In one example, the height of the scaled tooth model is adjusted according to the height of the occlusal pad to obtain an adjusted tooth model as Figure 3 shown. Adjusting the height of the tooth model implies adjusting the specific height parameters of the tooth model. Finally, the adjusted height of the tooth model is represented by H1 to H3 in Figure 11 . The heights H1 to H3 of the adjusted tooth model are affected by the initial shapes of the individual tooth models and need to be adjusted differently, so they are not necessarily equal.

[0074] In one example, the support 92 with a curved surface protruding towards the opposing dental arch of the three-dimensional digital dental model is: an ellipsoid or a sphere. An ellipsoid or a sphere can convert the load into in-plane stress and less out-of-plane stress when subjected to a pressure load, and is less likely to buckle compared to other shapes.

[0075] When the support 92 generated between the protrusions 91 of the three-dimensional digital dental model is an ellipsoid, the method of generating the support 92 connected to the two protrusions 91 respectively can be: determining the center point of the support 92 and the semi-major axis of the ellipsoid of the support 92 based on two adjacent protrusions 91 of the three-dimensional digital dental model, the height of the occlusal pad, and the three-dimensional digital dental model, and generating the support 92 based on the center of the ellipse of the support 92, the semi-major axis of the ellipsoid of the support 92, and a preset radius of curvature. In one example, the three-dimensional digital dental model has corresponding contralateral dental arch model data, and the contralateral dental arch model data includes the occlusal surfaces of the contralateral teeth. In this example, as Figure 12As shown in the figure, the method for determining the center point of the support body 92 and the semi-major axis of the ellipsoid of the support body 92 based on the convex part 91 of the two adjacent three-dimensional digital dental models, the height of the occlusal pad, and the three-dimensional digital dental model can be as follows: Project the feature points g1 and g2 of the convex part 91 of the two adjacent three-dimensional digital dental models along the positive and negative directions of the mesiodistal axis of the teeth of the three-dimensional digital dental model respectively to each other, and obtain two projection points gm1 and gd1 located on the convex part 91. The feature points g1 and g2 are the center, centroid, buccal cusp center point or lingual cusp center point of the tooth corresponding to the convex part 91. Among them, there are 2 points on the buccal cusp of the tooth where the convex part 91 is located, and the buccal cusp center point is the midpoint of the two buccal cusps. Similarly, the lingual cusp center point is the midpoint of the two lingual cusps; then take the midpoint G of the line connecting the two projection points located on the convex part 91, and project the midpoint G along the positive and negative directions of the normal of the occlusal plane of the three-dimensional digital dental model to the dental arch where the specified position of the three-dimensional digital dental model is located and the occlusal surface of the contralateral tooth, and obtain the first projection point M1 located on the dental arch where the specified position of the three-dimensional digital dental model is located and the second projection point M2 located on the occlusal surface of the contralateral tooth; construct a ray passing through the first projection point with the second projection point M2 as the endpoint, and determine the center point of the support body 92 (not marked in the figure) on the ray passing through the first projection point according to the height of the occlusal pad. The length of the line segment formed between the center point of the support body 92 and the second projection point M2 is the semi-major axis of the ellipsoid of the support body 92. The method for determining the center point of the support body 92 can be: According to the height of the occlusal pad, determine the center point of the support body 92 at a position on the ray passing through the first projection point M1 that is farther from the occlusal surface of the contralateral tooth relative to the first projection point M1. Then generate the support body 92 according to the center point of the support body 92, the semi-major axis of the ellipsoid of the support body 92, and a preset curvature radius. This method can be: First, generate the elliptical surface corresponding to the support body 92 according to the semi-major axis of the ellipsoid of the support body 92 and the preset curvature radius; then rotate the elliptical surface corresponding to the support body 92 by 180 degrees around the central axis formed by the semi-major axis of the ellipsoid of the support body 92 and the center point of the support body 92 to generate the support body 92. The part of the support body 92 that exceeds the occlusal pad generation area will be removed by Boolean operation in subsequent steps.

[0076] In step 904, the computer device that can be used to generate the dental model combines the three-dimensional digital dental model, the convex part 91, and the support body 92 to generate a three-dimensional digital dental model with an occlusal pad. Specifically, when combining, the union of the above parts can be obtained by Boolean operation, and the overlapping parts are automatically trimmed.

[0077] More specifically, in order to avoid the occlusal pad being too large and affecting the comfort of the patient during wearing, the comparison of the support body 92 can be added during the above-mentioned generation process to determine whether there is a part of the support body 92 that exceeds the occlusal pad generation area. The main comparison is whether it exceeds the buccolingual width of the covered teeth in the buccolingual direction, and the part of the support body 92 that exceeds the occlusal pad generation area is removed through Boolean operation.

[0078] It can be seen that by combining the above steps 901 to 904 to generate a three-dimensional digital dental model, it can be found that after the convex part and the support body are combined, it is equivalent to the occlusal pad in the foregoing embodiments, and the overall contour surface facing the opposing jaw after the convex part and the support body are combined is the outer contour surface of the occlusal pad facing the opposing jaw in the foregoing embodiments. That is to say, the contour surface of the support body part facing the opposing jaw is a chewing assistance area including one or more convex arc surfaces facing the opposing jaw.

[0079] In addition, another production process of the shell-shaped dental appliance can be called direct printing, which is specifically obtained by an additive manufacturing method. For example, the designed digital model of the shell-shaped tooth aligner is printed and manufactured by a 3D printing method. This method is printed in one go during the printing stage without extra processes and can be obtained at one time, and the resulting dental appliance has good firmness. In the foregoing embodiments, it 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 elaborated here one by one.

[0080] Another embodiment of the present invention also provides a shell-shaped dental appliance system, which specifically includes a series of shell-shaped dental appliances designed to gradually adjust multiple teeth from a first layout to a second layout. At least a plurality of the above-mentioned shell-shaped dental appliances are included in the series of shell-shaped dental appliances. Among them, the height of the occlusal pad satisfies that the occlusal pad in at least one shell-shaped dental appliance with a later implementation time is lower than the height of the occlusal pad at the same position in the shell-shaped dental appliance with an earlier implementation time.

[0081] In some embodiments, the above-mentioned series of shell-shaped dental appliances are designed to gradually adjust multiple teeth from a first layout to a second layout, and the heights of the occlusal pads at the same positions in the series of shell-shaped dental appliances are respectively reduced in a gradually decreasing design manner according to the order of implementation time.

[0082] Another embodiment of the present invention further provides a shell-shaped dental instrument set, including a first shell-shaped dental instrument and a second shell-shaped dental instrument respectively for accommodating maxillary teeth and mandibular teeth, and the first shell-shaped dental instrument and / or the second shell-shaped dental instrument are respectively the above-mentioned shell-shaped dental instruments; wherein, the occlusal pad of the first shell-shaped dental instrument includes a first acting surface, and the occlusal pad of the second shell-shaped dental instrument includes a second acting surface. When the first acting surface and the second acting surface interact with each other, they guide the movement of the mandibular dentition to adjust the intermaxillary relationship between the maxillary teeth and the mandibular teeth.

[0083] In some embodiments, when the shell-shaped dental instrument set is used to guide the forward movement of the mandibular dentition, the mesial side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the distal side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the distal side of the occlusal pad of the second shell-shaped dental instrument; when the shell-shaped dental instrument set is used to guide the backward movement of the mandibular dentition, the distal side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the mesial side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the mesial side of the occlusal pad of the second shell-shaped dental instrument.

[0084] It can be understood that all the above feasible solutions can be combined arbitrarily without contradiction. 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 given here.

[0085] The labeling device for the packaging line provided by the embodiment of the present invention has been introduced in detail above. 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, comprising a shell-shaped body provided with a plurality of tooth receiving cavities, and a jaw pad protruding towards the opposing jaw on the occlusal surface of the tooth receiving cavities in at least a part of the posterior tooth area, characterized in that, The outer contour surface of the occlusal pad facing the opposing jaw is concavo-convexly matched with the occlusal surface of the opposing teeth corresponding to the occlusal pad when the upper and lower jaws are in the occlusal state. The occlusal pad facing the opposing jaw is provided with a chewing assistance area, and the chewing assistance area includes one or more arc surfaces protruding towards the opposing jaw.

2. The shell-shaped dental instrument according to claim 1, wherein, The radius of curvature of the point on the arc surface closest to the opposing jaw in the vertical upward direction is within a preset range, and the preset range is determined according to the occlusal surface of the teeth corresponding to the occlusal pad when the upper and lower jaws are in the occlusal state.

3. The shell-shaped dental instrument according to claim 2, wherein The preset range is 0.2 mm - 0.8 mm.

4. The shell-shaped dental instrument according to claim 1, wherein, The arc surface is a partial spherical surface or a partial ellipsoidal surface.

5. The shell-shaped dental instrument according to claim 4, wherein, The arc surface is less than or equal to 1 / 2 spherical surface or 1 / 2 ellipsoidal surface.

6. The shell-shaped dental instrument according to claim 2, characterized in that, The height of the point on the arc surface closest to the opposing jaw in the vertical upward direction does not exceed the occlusal surface of the teeth corresponding to the occlusal pad when the upper and lower jaws are in the occlusal state.

7. The shell-shaped dental appliance according to claim 1, wherein the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the teeth in the tooth position where the occlusal pad is located; or, the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the opposing teeth in the tooth position where the occlusal pad is located; or, when the shell-shaped dental appliance corresponds to a treatment plan, the outer contour surface of the occlusal pad facing the opposing jaw is the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad is located in the treatment plan.

8. The shell-shaped dental appliance according to claim 1, wherein the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the teeth in the tooth position where the occlusal pad is located; or, the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the opposing teeth in the tooth position where the occlusal pad is located; or, when the shell-shaped dental appliance corresponds to a treatment plan, the outer contour surface of the occlusal pad facing the opposing jaw is formed by scaling the occlusal surface of the opposing target position corresponding to the teeth in the tooth position where the occlusal pad is located in the treatment plan.

9. The shell-shaped dental instrument according to claim 8, characterized in that, The occlusal pad covers at least two teeth, and the outer contour surface of the occlusal pad facing the opposing jaw includes at least two occlusal areas, each occlusal area corresponding to one tooth respectively, wherein the outer contour surface of the occlusal area is formed by scaling the occlusal surface of the corresponding tooth.

10. The shell-shaped dental instrument according to claim 9, characterized in that, Each occlusal area is 0.5 - 0.9 times the occlusal surface of the corresponding tooth.

11. The shell-shaped dental instrument according to claim 9, wherein The chewing assistance area is arranged between the two occlusal areas.

12. The shell-shaped dental instrument according to claim 1, wherein When there are multiple arc surfaces, the heights of the multiple arc surfaces in the vertical upward direction are inconsistent.

13. The shell-shaped dental instrument according to claim 1, characterized in that, The chewing assistance area is arranged corresponding to the tooth fossa of the opposing target teeth.

14. The shell-shaped dental instrument according to claim 1, wherein The occlusal pad covers at least two teeth, and the chewing assistance area is correspondingly arranged at the position of the adjacent tooth gap.

15. The shell-shaped dental instrument according to any one of claims 1-14, characterized in that, The length of the occlusal pad in the mesiodistal direction is within the range of tooth positions 4 - 6.

16. A shell-shaped dental instrument system includes a series of shell-shaped dental instruments designed to progressively effect the adjustment of multiple teeth from a first layout to a second layout, characterized in that, At least multiple shell-shaped dental appliances as described in any one of claims 1 - 15 are included in the series of shell-shaped dental appliances, wherein the height of the occlusal pad satisfies that the occlusal pad in at least one shell-shaped dental appliance with a later implementation time is lower in height than the occlusal pad at the same position in the shell-shaped dental appliance with an earlier implementation time.

17. A shell-shaped dental instrument set, including a first shell-shaped dental instrument for accommodating maxillary teeth and a second shell-shaped dental instrument for accommodating mandibular teeth, characterized in that, The first shell-shaped dental appliance and / or the second shell-shaped dental appliance are respectively the shell-shaped dental appliances as described in any one of claims 1 - 15; wherein, The occlusal pad of the first shell-shaped dental instrument includes a first acting surface, and the occlusal pad of the second shell-shaped dental instrument includes a second acting surface. When the first acting surface and the second acting surface interact with each other, they guide the movement of the mandibular dentition to adjust the intermaxillary relationship between the maxillary teeth and the mandibular teeth.

18. The shell-shaped dental instrument set according to claim 17, wherein, When the set of shell-shaped dental instruments is used to guide the forward movement of the mandibular dentition, the mesial side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the distal side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the distal side of the occlusal pad of the second shell-shaped dental instrument; When the set of shell-shaped dental instruments is used to guide the backward movement of the mandibular dentition, the distal side surface of the occlusal pad of the first shell-shaped dental instrument is the first acting surface, and the mesial side surface of the occlusal pad of the second shell-shaped dental instrument is the second acting surface. When the upper and lower jaws are in the occlusal state, the occlusal pad of the first shell-shaped dental instrument is located on the mesial side of the occlusal pad of the second shell-shaped dental instrument.

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