Shell-shaped tooth appliance
By designing the transition cavity and extension in the first section of the shell-shaped tooth orthodontic device, the shell stiffness is enhanced, and the problem of insufficient orthodontic device is solved, and efficient movement of the teeth and reduced undesired movement are achieved.
Patent Information
- Application Number
- CN202422064325.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the process of orthodontics, especially when the tooth extraction gap is closed or opened, the inadequate orthodontic force leads to low tooth movement efficiency and prone to undesirable tooth rotation.
The first section of the shell-shaped tooth orthodontic device is designed including a tooth storage cavity that wraps the teeth to be moved and an adjacent tooth storage cavity, connected by a transition cavity, and extends in the gingival and jaw direction to form an extension, enhancing the stiffness of the shell and providing sufficient orthodontic force to improve the tooth movement efficiency.
By enhancing the stiffness and orthodontic force of the shell, the movement efficiency of the teeth is effectively improved, and undesired tooth movement is reduced, ensuring that the teeth move to the target position as expected.
Smart Images
Figure CN223158446U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of orthodontics, and particularly to a shell-shaped dental appliance. Background Art
[0002] With the continuous development of orthodontic technology, shell-shaped dental appliances have begun to be adopted by more and more orthodontic patients. Compared with traditional wire orthodontic appliances, shell-shaped dental appliances are convenient to wear and do not affect the aesthetics of the patient's teeth. Shell-shaped dental appliances are composed of polymer materials, such as; TPU, PETG or a combination of both materials, etc., which can generate acting forces to change the deformed jawbones, malpositioned teeth and periodontal tissues, and are beneficial to the normal growth and development of the dentofacial region. Shell-shaped dental appliances use the principle of biomechanics to correct deformed teeth. Through a correction system including a series of shell-shaped appliances, gentle and lasting biological forces are applied to slowly move the teeth and restore them to their normal positions, arranging the teeth neatly.
[0003] Shell-shaped dental appliances rely on the shape difference from the patient's teeth to achieve specific tooth movement. After wearing, the shell-shaped dental appliance undergoes elastic deformation to apply a correction force to the teeth. During the process of correcting the patient's teeth to achieve the final correction goal, due to the inherent characteristics of the shell-shaped dental appliance, it will affect the movement efficiency of the patient's teeth. When the required tooth movement is large, especially during the correction of closing extraction spaces or opening spaces, the correction force applied by the shell-shaped dental appliance for such movements is limited. This may lead to unwanted tooth movement during the correction process and reduce the tooth movement efficiency. For example, during the correction treatment of closing extraction spaces in extraction orthodontics, for a shell-shaped dental appliance, due to its low stiffness, the correction force applied to the teeth is limited, and the teeth on both sides of the extraction space will tilt towards the gap, resulting in the occurrence of the roller coaster effect, which will bring unwanted rotation of the teeth. Moreover, due to the insufficient applied correction force, the teeth cannot reach the target position quickly, which will reduce the movement efficiency of the patient's teeth during the correction process.
[0004] Therefore, how to improve the movement efficiency of the patient's teeth and reduce unwanted tooth movement when using a shell-shaped dental appliance is an important issue. Summary of the Utility Model
[0005] The purpose of the embodiments of the present application is to provide a shell-shaped dental appliance, which can be beneficial to improving the movement efficiency of the patient's teeth and avoiding unwanted tooth movement.
[0006] To achieve the above objectives, embodiments of the present application provide a shell-shaped dental appliance. The shell-shaped dental appliance comprises a shell-shaped body for wearing on a patient's dentition. The shell-shaped body includes a first section having multiple tooth-receiving cavities. The first section includes a first tooth-receiving cavity that encloses the tooth to be moved, a second tooth-receiving cavity that encloses the teeth on one side of the tooth to be moved, and a transition cavity that connects the first tooth-receiving cavity and the second tooth-receiving cavity. The transition cavity is provided corresponding to the gap between the tooth to be moved and the teeth on one side of the tooth to be moved. The transition cavity includes a first connecting portion connected to the first tooth-receiving cavity and a second connecting portion connected to the second tooth-receiving cavity, the first connecting portion and the second connecting portion being arranged relative to each other in the mesiodistal direction. The first section also includes an extension portion extending from the edges of the first tooth-receiving cavity, the second tooth-receiving cavity, and the transition cavity toward the gums. The distance H between the edge of the extension portion and the corresponding gum line in the gingival-maxillary direction is greater than or equal to 2 mm and less than or equal to 8 mm. When the shell-shaped body is worn, the tooth to be moved moves into the gap under the force applied by the first section.
[0007] The shell-shaped dental appliance provided in the embodiments of this application features a first section of the shell body with different tooth-receiving cavities designed to enclose the teeth on either side of the gap, and a transition cavity connecting the different tooth-receiving cavities. The transition cavity is positioned corresponding to the gap to be filled by the teeth to be moved. Furthermore, the first section includes an extension extending toward the gums, which increases the effective dimension of the first section in the gingival-jaw direction, thereby improving the first section's resistance to deformation. This provides sufficient correction force to the patient's teeth, thereby improving the efficiency of tooth movement.
[0008] In some embodiments, the highest point of the first connecting portion in the gingival-jaw direction is closer to the gum line of the present jaw than the highest point of the first tooth-receiving cavity in the gingival-jaw direction; and / or the highest point of the second connecting portion in the gingival-jaw direction is closer to the gum line of the present jaw than the highest point of the second tooth-receiving cavity in the gingival-jaw direction. In this way, by ensuring that the connecting portion of the transition cavity and the tooth-receiving cavity does not extend beyond the corresponding tooth-receiving portion in the direction away from the tooth root, the purpose of suppressing undesirable movement of the tooth to be moved and undesirable movement of the tooth that does not need to be moved can be effectively achieved, while facilitating the desired movement of the tooth to be moved.
[0009] In some embodiments, the highest point of the first connecting portion in the gingival-jaw direction is located within one-third of the occlusal surface of the first tooth-receiving cavity, closest to the tooth to be moved. Thus, by controlling the connection between the transition cavity and the tooth-receiving cavity within a certain range, the effect of the first section on the tooth can be precisely controlled.
[0010] In some embodiments, the width of the first connecting portion in the buccolingual direction is smaller than the width of the first tooth receiving cavity in the buccolingual direction; and / or, the width of the second connecting portion in the buccolingual direction is smaller than the width of the second tooth receiving cavity in the buccolingual direction. In this way, by reducing the width of the connecting portion between the transition cavity and the tooth receiving cavity in the buccolingual direction, the anti-deformation ability of the transition cavity can be improved.
[0011] In some embodiments, the number of teeth on one side wrapped by the second tooth receiving cavity is at least one. In this way, by adjusting the number of teeth wrapped by the second tooth receiving cavity, the action range of the second tooth receiving cavity can be changed, so as to adjust the movement effect on the teeth.
[0012] In some embodiments, the first tooth receiving cavity further wraps 1-2 teeth adjacent to the tooth to be moved and located on the side away from the gap. In this way, the force application effect on the tooth to be moved can be changed by changing the number of teeth wrapped by the first tooth receiving cavity.
[0013] In some embodiments, the extension portion is provided with a reinforcing ridge protruding towards the buccal / lingual side, and the reinforcing ridge extends along the mesiodistal direction. In this way, the anti-deformation ability of the extension portion can be improved by the setting of the reinforcing ridge.
[0014] In some embodiments, the shell-shaped body further includes a second section adjacent to the first section, and the second section has a plurality of tooth receiving cavities for wrapping the other teeth in the dental arch except the teeth wrapped by the first section. In this way, the purpose of specific tooth movement can be better achieved through the cooperation of the second section and the first section.
[0015] In some embodiments, the edge of the second section is disposed corresponding to the gingival line position. In this way, by disposing the edge of the second section corresponding to the gingival line, the discomfort brought to the patient during wearing can be reduced.
[0016] In some embodiments, the material thickness of the first section is greater than that of the second section, and / or, the elastic modulus of the first section is greater than that of the second section. In this way, the stiffness of the first section can be improved by controlling the material thickness or elastic modulus of different sections. Description of the Drawings
[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. 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, the drawings in the figures do not constitute a proportional limitation.
[0018] Figure 1 It is a schematic structural diagram of the shell-shaped tooth aligner provided by some embodiments of the present application when wrapping teeth;
[0019] Figure 2 Schematic cross-sectional structure diagram when the shell-shaped tooth aligner provided by some embodiments of the present application wraps the teeth;
[0020] Figure 3 and Figure 4 Schematic structure diagram when the shell-shaped tooth aligner provided by other embodiments of the present application wraps the teeth;
[0021] Figure 5 Schematic structure diagram when the shell-shaped tooth aligner provided by still other embodiments of the present application wraps the teeth;
[0022] Figure 6 Schematic structure diagram when the shell-shaped tooth aligner provided by still other embodiments of the present application wraps the teeth;
[0023] Figure 7 Schematic three-dimensional structure diagram of the shell-shaped tooth aligner provided by some embodiments of the present application;
[0024] Figure 8 Schematic three-dimensional structure diagram of the shell-shaped tooth aligner provided by other embodiments of the present application;
[0025] Figure 9 Schematic three-dimensional structure diagram of the shell-shaped tooth aligner provided by still other embodiments of the present application;
[0026] Figure 10 Schematic three-dimensional structure diagram of the shell-shaped tooth aligner provided by still other embodiments of the present application;
[0027] Figure 11 Simulation model diagram of the shell-shaped tooth aligner provided by some embodiments of the present application;
[0028] Figure 12 Simulation model diagram of the shell-shaped tooth aligner provided by other embodiments of the present application;
[0029] Figure 13 Control simulation model diagram provided by some embodiments of the present application;
[0030] Figure 14 is Figure 11 Schematic diagram of the shell deformation simulation result of the shown simulation model;
[0031] Figure 15 is Figure 12 Schematic diagram of the shell deformation simulation result of the shown simulation model;
[0032] Figure 16 is Figure 13 Schematic diagram of the shell deformation simulation result of the shown simulation model;
[0033] Figure 17 isFigure 11 Schematic diagram of the tooth movement simulation result of the shown simulation model;
[0034] Figure 18 is Figure 12 Schematic diagram of the tooth movement simulation result of the shown simulation model;
[0035] Figure 19 is Figure 13 Schematic diagram of the tooth movement simulation result of the shown simulation model. Specific implementation manners
[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will elaborate on the various implementation manners of the present application in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in the various implementation manners of the present application, many technical details are presented for the purpose of enabling readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions claimed in the present application can still be implemented. The division of the following various embodiments is for convenience of description and should not constitute any limitation on the specific implementation manners of the present application. The various embodiments can be combined and cross-referenced with each other on the premise of no contradiction.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawing descriptions are intended to cover non-exclusive inclusion.
[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0039] The shell-shaped tooth aligner is suitable for invisible orthodontics. Usually, a series of shell-shaped tooth aligners are designed according to the current shape and the final desired shape of the dental arch of the orthodontic patient to achieve step-by-step orthodontics. By wearing shell-shaped tooth aligners of different shapes during different orthodontic periods, the teeth of the patient can be gradually guided to move until the dental arch of the patient reaches the final desired shape.
[0040] Due to the inherent characteristics of the shell - type tooth aligner, unwanted tooth movement may occur during the orthodontic treatment process, and it will also affect the movement efficiency of the patient's teeth. For example, in orthodontic treatment involving tooth extraction, corrective treatment for closing the extraction space of the patient is usually required. For fixed orthodontics, when the main arch wire reaches a certain size, such as 0.019 * 0.025 inch, during the corrective treatment for closing the extraction space, the teeth can basically move as a whole. However, for the shell - type tooth aligner, due to its relatively low stiffness, the orthodontic force applied to the teeth is limited. Especially when performing corrective treatment for closing the extraction space or opening the space, the shell - type tooth aligner has limited ability to apply orthodontic force for such movements. This may lead to unwanted tooth movement during the orthodontic treatment process and reduce the movement efficiency of the teeth. For example, during the corrective treatment for closing the extraction space in orthodontic treatment involving tooth extraction, for the shell - type tooth aligner, due to its relatively low stiffness and limited orthodontic force applied to the teeth, the teeth on both sides of the extraction space will tilt towards the edentulous space, resulting in the occurrence of the roller - coaster effect, which will bring about unwanted tooth rotation. Moreover, due to insufficient applied orthodontic force, the teeth cannot reach the target position quickly, which will reduce the movement efficiency of the patient's teeth during the orthodontic treatment process.
[0041] In order to improve the movement efficiency of the teeth of orthodontic patients, some embodiments of the present application provide a shell - type tooth aligner. The shell - type tooth aligner is designed with an extension part for the shell at the gap, and the extension part is arranged towards the gingival direction of the patient's teeth. By setting the extension part, the stiffness of the shell at the gap is increased. Moreover, through the interaction between the extension part and the part wrapping the teeth, while guiding the teeth to move in the desired manner, sufficient orthodontic force is provided to improve the movement efficiency of the patient's teeth.
[0042] The following describes the structure of the shell - type tooth aligner provided by some embodiments of the present application with reference to the accompanying drawings.
[0043] As Figure 1 and Figure 2As shown in the figure, the shell-shaped tooth orthodontic appliance 10 provided by some embodiments of the present application includes a shell-shaped body 101 for wearing on a patient's dentition. The shell-shaped body 101 includes a first section 11 having a plurality of tooth receiving cavities 102. The first section 11 includes a first tooth receiving cavity 111 for enclosing the tooth A to be moved, a second tooth receiving cavity 112 for enclosing a tooth B on one side of the tooth A to be moved, and a transition cavity 113 connecting the first tooth receiving cavity 111 and the second tooth receiving cavity 112. The transition cavity 113 is provided corresponding to the gap C between the tooth A to be moved and the tooth B on one side of the tooth A to be moved. The transition cavity 113 includes a first connecting portion 1131 connected to the first tooth receiving cavity 111 and a second connecting portion 1132 connected to the second tooth receiving cavity 112. The first connecting portion 1131 and the second connecting portion 1132 are oppositely arranged in the mesiodistal direction. The first section 11 further includes an extension portion 114 extending from the edges of the first tooth receiving cavity 111, the second tooth receiving cavity 112, and the transition cavity 113 toward the gingival direction. There is a distance H in the gingivomarginal direction between the edge of the extension portion 114 and the corresponding gingival line 201. The distance H is greater than or equal to 2 mm (millimeters) and less than or equal to 8 mm. Such a size design can not only meet the improvement of the orthodontic force but also ensure the comfort of wearing the shell-shaped tooth orthodontic appliance 10. Among them, when the shell-shaped body 101 is worn, the tooth A to be moved moves toward the gap C under the force applied by the first section 11. The first tooth receiving cavity 111 in each embodiment of the present application may correspond to one tooth receiving cavity or multiple tooth receiving cavities, and the second tooth receiving cavity 112 may also correspond to one tooth receiving cavity or multiple tooth receiving cavities.
[0044] The shell-shaped body 101 corrects the teeth 20 of orthodontic patients by wearing on the patient's dentition. The shell-shaped body 101 includes a first section 11. The first section 11 has a plurality of tooth receiving cavities 102. The tooth receiving cavities 102 form a tooth accommodation space, and the teeth 20 at the corresponding positions of the patient can be accommodated therein. The shape of the tooth receiving cavity 102 has a certain difference from the shape of the teeth 20 at the corresponding positions of the patient. When the patient wears the shell-shaped tooth orthodontic appliance 10, the housing at the tooth receiving cavity 102 deforms to generate a deformation recovery force, so as to apply an orthodontic force to the teeth 20 that need to be moved and control the specific movement of the teeth 20.
[0045] For the tooth 20 that needs to move towards the gap C, the first section 11 is designed with different tooth receiving cavities 102 that wrap the teeth 20 on both sides of the gap C, and a transition cavity 113 provided corresponding to the gap C. The gap C corresponding to the transition cavity 113 can be an adjacent tooth gap, an extraction gap or an edentulous gap existing in the patient's dentition, and the position where the gap C appears can be one or more. The connecting part of the housing at the transition cavity 113 and the housing at the first tooth receiving cavity 111 forms a first connecting part 1131, and the connecting part of the housing at the transition cavity 113 and the housing at the second tooth receiving cavity 112 forms a second connecting part 1132. The first connecting part 1131 and the second connecting part 1132 abut against the adjacent surfaces of different teeth 20 on both sides of the gap C.
[0046] The first section 11 also extends towards the gingival direction to form an extension part 114, and the extension part 114 is arranged corresponding to the gingival part of the patient. The distance H between the edge at the extension end of the extension part 114 and the gingival line 201 is within 2 mm to 8 mm. For example, it can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm or 8 mm. In actual situations, the distance H can be designed according to the depth of the patient's oral mucosa reflection and the patient's tolerance degree. If the depth of the patient's oral mucosa reflection is large and the patient is not sensitive to foreign objects, a larger distance H can be designed. The larger the distance H, the better the treatment effect on the patient. At the same time, the extension part 114 can be arranged on the buccal side of the first section 11, or on the lingual side of the first section 11, or the extension part 114 is arranged on both the buccal side and the lingual side of the first section 11 at the same time.
[0047] In the shell-shaped tooth orthodontic appliance 10 provided by some embodiments of the present application, different tooth receiving cavities 102 that wrap the teeth 20 on both sides of the gap C are designed in the first section 11 of the shell-shaped body 101, and a transition cavity 113 that communicates with different tooth receiving cavities 102 is designed. The transition cavity 113 is provided corresponding to the gap C to be filled by the tooth A to be moved. At the same time, the first section 11 extends towards the gingival direction with an extension part 114, and the extension part 114 improves the effective size of the first section 11 in the gingivo-occlusal direction, and can improve the stiffness of the first section 11. Thereby providing sufficient orthodontic force for the patient's teeth 20 to improve the movement efficiency of the patient's teeth 20.
[0048] In addition, by increasing the acting length of the first section 11 in the gingivo-occlusal direction, and by means of the interaction between different parts, the positional relationship between the acting force line and the impedance center of the patient's teeth 20 can be changed. It is beneficial to improve the acting force effect exerted by the shell-shaped body 101 on the patient's teeth 20, and is more beneficial to achieve the overall movement purpose of the teeth 20 on both sides of the gap C of the patient.
[0049] It should be noted that Figure 1The shell - shaped dental appliance 10 including the first section 11 shown only wraps some teeth of the patient's dentition. In actual situations, the first section 11 can be designed corresponding to the entire dentition of the patient's upper or lower jaw in the mesiodistal direction, or corresponding to a part of the dentition of the patient's upper or lower jaw. That is, the shell - shaped dental appliance 10 can only include the first section 11. The shell - shaped dental appliance 10 that only includes the first section 11 can wrap all the teeth 20 of the patient's dentition, or only wrap some teeth 20 of the patient's dentition.
[0050] Reference Figure 3 and Figure 4 As shown, in some embodiments, the highest point of the first connecting portion 1131 in the gingivomandibular direction can be closer to the gingival margin of the same jaw than the highest point of the first tooth receiving cavity 111 in the gingivomandibular direction; and / or, the highest point of the second connecting portion 1132 in the gingivomandibular direction can be closer to the gingival margin of the same jaw than the highest point of the second tooth receiving cavity 112 in the gingivomandibular direction.
[0051] The highest point M of the first connecting portion 1131 in the gingivomandibular direction X is the point where the first connecting portion 1131 is farthest from the direction of the gingival margin of the same jaw, and the highest point N of the first tooth receiving cavity 111 in the gingivomandibular direction is the point where the first tooth receiving cavity 111 is farthest from the direction of the gingival margin of the same jaw. That is to say, compared with the part of the occlusal surface 21 of the wrapped tooth 20 covered by the shell at the first tooth receiving cavity 111, the distance between the part of the transition cavity 113 connected to the first tooth receiving cavity 111 and the gingival margin 201 of the same jaw is smaller. Reducing the size of the wrapping space of the transition cavity 113 in the gingivomandibular direction can inhibit the undesired movement of the teeth 20 adjacent to the gap C, and at the same time guide the desired movement of the teeth 20 adjacent to the gap C. For example, through the restriction of the transition cavity 113, the tilting movement of the tooth A to be moved towards the gap C near the top of the occlusal surface 21 can be blocked, and the overall movement of the tooth A to be moved towards the gap C can be guided.
[0052] Continue to refer to Figure 3 and Figure 4 As shown, similar to the first connecting portion 1131, the highest point P of the second connecting portion 1132 in the gingivomandibular direction X can also be closer to the gingival margin of the same jaw than the highest point Q of the second tooth receiving cavity 112 in the gingivomandibular direction X. Or simultaneously, the highest point M of the first connecting portion 1131 in the gingivomandibular direction is closer to the gingival margin of the same jaw than the highest point N of the first tooth receiving cavity 111 in the gingivomandibular direction X, and the highest point P of the second connecting portion 1132 in the gingivomandibular direction X is closer to the gingival margin 201 of the same jaw than the highest point Q of the second tooth receiving cavity 112 in the gingivomandibular direction X.
[0053] As Figure 1 and Figure 2As shown, the housing at the first tooth receiving cavity 111 has a abutting portion on the adjacent surface of the wrapped tooth 20 near the gap C, and this portion covers the area of the adjacent surface of the tooth 20 near the occlusal surface 21. This portion of the housing can serve the purpose of restricting the movement of the tooth 20, and at the same time is conducive to forming a couple moment on the tooth A to be moved, so as to achieve a specific movement effect of the tooth A to be moved.
[0054] In addition, the highest point of the first connecting portion 1131 in the gingivo-occlusal direction can be located within the range of 1 / 3 of the occlusal surface of the first tooth receiving cavity 111 close to the tooth A to be moved.
[0055] That is, the housing at the transition cavity 113 is connected to the housing at the first tooth receiving cavity 111 at the 1 / 3 position of the tooth A to be moved wrapped by the first tooth receiving cavity 111 near the occlusal surface 21. By controlling the size of the transition cavity 113, the force application area on the tooth A to be moved wrapped by the first tooth receiving cavity 111 can be accurately controlled, so as to accurately control the movement form and movement efficiency of the tooth A to be moved.
[0056] In addition, similar to the first connecting portion 1131, the highest point of the second connecting portion 1132 in the gingivo-occlusal direction can be located within the range of 1 / 3 of the occlusal surface of the second tooth receiving cavity 112 close to the wrapped tooth.
[0057] In some embodiments, the width of the first connecting portion 1131 in the bucco-lingual direction can be less than the width of the first tooth receiving cavity 111 in the bucco-lingual direction; and / or, the width of the second connecting portion 1132 in the bucco-lingual direction can be less than the width of the second tooth receiving cavity 112 in the bucco-lingual direction.
[0058] That is to say, the connecting portion of the transition cavity 113 and one side tooth receiving cavity 102 is narrowed in the bucco-lingual direction, or the connecting portions of the transition cavity 113 and the two side tooth receiving cavities 102 are simultaneously narrowed in the bucco-lingual direction, which is beneficial to the improvement of the strength of this part.
[0059] In actual situations, the palatal side portion of the transition cavity 113 can be narrowed. The closer to the hard palate area, the relatively insensitive the patient's gingival tissue is. The shell-shaped body 101 can fit the patient's teeth 20 more closely, can provide better orthodontic force, and achieve better orthodontic effects and movement efficiency. In addition, a pressurized cavity can be designed on the buccal side of the housing at the transition cavity 113 to improve the local strength and enhance the local anti-deformation ability.
[0060] In some embodiments, the number of teeth B on one side wrapped by the second tooth receiving cavity 112 can be at least one.
[0061] That is to say, the second tooth receiving cavity 112 can wrap a single tooth 20 alone, or can continuously wrap multiple teeth 20 in the mesiodistal direction. In actual situations, the design of the extension length of the second tooth receiving cavity 112 in the mesiodistal direction can be carried out according to the orthodontic force required to be applied to the adjacent teeth on one side of the gap C. In the case where a relatively large orthodontic force needs to be provided to adapt to the overall movement of the adjacent teeth, the second tooth receiving cavity 112 can wrap multiple teeth 20 to improve the overall anti-deformation ability of the second tooth receiving cavity 112. In actual situations, as Figure 3 shown, the number of teeth B on one side of the upper jaw wrapped by the second tooth receiving cavity 112 can be one. As Figure 5 shown, the number of teeth B on one side of the upper jaw wrapped by the second tooth receiving cavity 112 can be two.
[0062] In addition, in some embodiments, the first tooth receiving cavity 111 can also wrap 1-2 teeth 20 adjacent to the tooth A to be moved and located on the side away from the gap C.
[0063] That is to say, similarly, the number of teeth 20 wrapped by the first tooth receiving cavity 111 in the mesiodistal direction can be adjusted to change the design length of the first tooth receiving cavity 111 in the mesiodistal direction. Thereby adapting to the movement purpose of the tooth A to be moved and improving the movement efficiency of the teeth 20. As Figure 5 and Figure 6 shown, the first tooth receiving cavity 111 can wrap the tooth A to be moved in the upper jaw and 1 tooth 20 adjacent to the tooth A to be moved and located on the side away from the gap C.
[0064] In addition, Figures 7 to 9 respectively illustrate the shell-shaped tooth orthodontic appliance 10 worn on the patient's mandible. Among them, Figure 7 it is shown that the extension part 114 included in the first section 11 can extend and be arranged at the buccal edge and the lingual edge simultaneously. Figure 8 it is shown that the first section 11 extends the extension part 114 at the buccal edge, and the first tooth receiving cavity 111 of the first section 11 wraps one tooth in the mandible, and the second tooth receiving cavity 112 wraps one tooth in the mandible of the shell-shaped tooth orthodontic appliance 10. Figure 9 it is shown that the first section 11 extends the extension part 114 at the buccal edge, and the first tooth receiving cavity 111 of the first section 11 wraps multiple teeth in the mandible, and the second tooth receiving cavity 112 wraps multiple teeth in the mandible of the shell-shaped tooth orthodontic appliance 10.
[0065] In some embodiments, the extension part 114 of the first section 11 can be provided with a strengthening ridge 115 protruding towards the buccal / lingual side, and the strengthening ridge 115 extends along the mesiodistal direction.
[0066] The arrangement of the strengthening ridge 115 can enhance the anti-folding ability of the shell-shaped body 101. By changing the shape of the shell, the formation of stress concentration can be avoided, and the local stiffness of the shell can be enhanced to improve the force application effect on the tooth 20. In actual situations, the number, position, and shape of the strengthening ridge 115 can be specifically designed according to the orthodontic stage of the shell-shaped tooth orthodontic appliance 10. For example, Figure 10 As shown, the strengthening ridge 115 arranged on the extension portion 114 can bulge towards the lingual side. In actual situations, the strengthening ridge 115 arranged on the extension portion 114 can also bulge towards the buccal side.
[0067] When correcting adjacent teeth at the gap C in the upper or lower jaw of a patient, in order to better achieve the purpose of overall tooth movement, an attachment can be fixed on the tooth A to be moved, and the attachment can have a part corresponding to the extension portion 114. Thus, the force application area range of the shell-shaped tooth orthodontic appliance 10 can be matched, and the force application effect of the shell-shaped tooth orthodontic appliance 10 can be effectively improved. When meeting the orthodontic requirement of overall movement of the tooth 20, the attachment can adopt a vertical rectangular attachment to apply a couple moment to the tooth. Long traction hooks can also be pasted on the gingival ends of the teeth 20 on both sides of the gap C in the upper or lower jaw of the patient, and a certain magnitude of traction force, such as a traction force of 50 g (grams) to 100 g, can be applied through the traction hooks. The traction hooks can be bonded to the buccal side of the teeth 20 on both sides of the gap C, and the vertical rectangular attachment can be bonded to the palatal side of the teeth 20 on both sides of the gap C. An opposition can be formed between the buccal traction hook and the palatal attachment to reduce the torsional tendency of the tooth 20. The traction hook can extend the line of action force to near the impedance center of the tooth, which is beneficial to achieving the overall movement of the tooth 20 towards one side gap C. Even if the line of traction force cannot completely reach the impedance center of the tooth 20 and the tooth 20 has a certain inclination when the gap C is closed, the stiffness of the shell-shaped body 101 or the couple moment generated in cooperation with the vertical rectangular attachment can also upright the tooth 20.
[0068] For example, Figures 3 to 10 As shown, the shell-shaped body 101 can further include a second section 12 adjacently arranged to the first section 11. The second section 12 has a plurality of tooth receiving cavities 102 for wrapping the teeth 20 other than those wrapped by the first section 11 in the dental arch.
[0069] The second section 12 is connected to the first section 11, and the second section 12 can act on the teeth 20 that are farther away from the gap C. For the second section 12, it can assist in correcting the movement of the teeth 20 with a relatively small applied force. The second section 12 can be arranged on one side of the first section 11 along the mesiodistal direction or on both sides of the first section 11 along the mesiodistal direction. The second section 12 can be integrally formed with the first section 11 to simplify the manufacturing process of the shell-shaped tooth orthodontic appliance 10.
[0070] In addition, the edge of the second section 12 can be arranged corresponding to the position of the gingival line 201.
[0071] The edge of the second section 12 is arranged corresponding to the gingival line 201, that is, the second section 12 does not extend to the gingival part on the side of the gingival line 201. The second section 12 can be arranged corresponding to the position where there is no obvious gap C in the patient's dentition to meet the normal wearing needs of the patient and reduce the foreign body sensation when the patient wears it.
[0072] In some embodiments, the material thickness of the first section 11 can be greater than the material thickness of the second section 12, and / or, the elastic modulus of the first section 11 is greater than the elastic modulus of the second section 12.
[0073] The first section 11 can adopt a manufacturing material that is thicker than that of the second section 12. The greater the thickness, the greater the structural strength of the housing, and the greater the force exerted on the tooth 20. Thus, the purpose of tooth 20 movement can be better achieved and the movement efficiency of tooth 20 can be improved. Similarly, the greater the elastic modulus, the greater the stiffness of the housing, and the more obvious the force exerted on the tooth 20. In actual situations, the elastic modulus of different parts of the housing can be adjusted by changing the type of manufacturing material, the manufacturing method, or the combination of accessories.
[0074] It should be noted that the size of the extension 114 is associated with the sizes of the various parts in the first section 11. Here, with the shell-shaped tooth aligner 10 with different extensions and without extensions, the deformation degree of the housing of the shell-shaped tooth aligner 10 and the movement effect of the teeth are respectively simulated. In Figure 11 In the shown simulation model, the shell-shaped tooth aligner 10 provided by some embodiments of the present application is adopted. The extension 114 extends from the area of the 3rd to the 5th teeth (the middle 4th tooth is missing) from the left to the right in the drawing plane towards the gingival part and is located on the buccal side of the shell-shaped tooth aligner 10 (designing the 5th tooth to move into the distal gap). In Figure 12 In the shown simulation model, the shell-shaped tooth aligner 10 provided by some embodiments of the present application is adopted. The extension 114 extends from the area of the 2nd to the 6th teeth (the middle 4th tooth is missing) from the left to the right in the drawing plane towards the gingival part and is located on the buccal side of the shell-shaped tooth aligner 10 (designing the 5th tooth to move into the distal gap). Figure 13 For the control group (the middle 4th tooth is missing), the adopted shell-shaped tooth aligner 10 does not extend towards the gingival part (designing the 5th tooth to move into the distal gap). Figures 14 to 16 ( Figures 14 to 16 The different colors in represent the deformation amount of the housing) respectively show the deformation effects of the housing of the shell-shaped tooth aligner 10 when different extensions are set and when no extension is set. Figures 17 to 19 ( Figures 17 to 19The movement amounts of teeth characterized by different colors respectively show the tooth movement effects of the shell-shaped tooth aligner 10 when different extension parts are provided and when no extension part is provided. From Figures 14 to 16 it can be seen that increasing the wrapping of the shell-shaped tooth aligner 10 on the gingival side can resist the deformation of the shell and provide sufficient force application effect for the teeth. From Figures 17 to it can be seen that increasing the wrapping of the shell-shaped tooth aligner 10 on the gingival side can better complete the root control movement and achieve the specific movement purpose of the teeth.
[0075] Those of ordinary skill in the art can understand that the above embodiments are specific examples for implementing the present application, and in practical applications, various changes can be made to them in form and details without departing from the spirit and scope of the present application.
Claims
1. A shell-shaped dental appliance, comprising a shell-shaped body for wearing on a patient's dentition, characterized in that, The shell-shaped body includes a first section having a plurality of tooth receiving cavities; the first section includes a first tooth receiving cavity for wrapping the tooth to be moved, a second tooth receiving cavity for wrapping the tooth on one side of the tooth to be moved, and a transition cavity connecting the first tooth receiving cavity and the second tooth receiving cavity; The transition cavity is provided corresponding to the gap between the tooth to be moved and the tooth on one side of the tooth to be moved; the transition cavity includes a first connecting portion connected to the first tooth receiving cavity and a second connecting portion connected to the second tooth receiving cavity, and the first connecting portion and the second connecting portion are oppositely arranged in the mesiodistal direction; The first section further includes an extension portion extending from the edges of the first tooth receiving cavity, the second tooth receiving cavity, and the transition cavity toward the gingiva direction, and there is a distance H in the gingivomarginal direction between the edge of the extension portion and the corresponding gingival line, and the distance H is greater than or equal to 2 mm and less than or equal to 8 mm; wherein, when worn, the tooth to be moved moves toward the gap under the force of the first section.
2. The shell-shaped tooth aligner according to claim 1, characterized in that: The highest point of the first connecting portion in the gingivomarginal direction is closer to the gingival line of the same jaw than the highest point of the first tooth receiving cavity in the gingivomarginal direction; and / or, the highest point of the second connecting portion in the gingivomarginal direction is closer to the gingival line of the same jaw than the highest point of the second tooth receiving cavity in the gingivomarginal direction.
3. The shell-shaped tooth aligner according to claim 2, characterized in that: The highest point of the first connecting portion in the gingivomarginal direction is within 1 / 3 range of the occlusal surface of the first tooth receiving cavity close to the tooth to be moved.
4. The shell-shaped tooth aligner according to claim 1 or 2, characterized in that: The width of the first connecting portion in the buccolingual direction is smaller than the width of the first tooth receiving cavity in the buccolingual direction; and / or, the width of the second connecting portion in the buccolingual direction is smaller than the width of the second tooth receiving cavity in the buccolingual direction.
5. The shell-shaped tooth aligner according to claim 1, characterized in that: The number of teeth on one side wrapped by the second tooth receiving cavity is at least one.
6. The shell-shaped tooth aligner according to claim 1 or 5, characterized in that: The first tooth receiving cavity further wraps 1-2 teeth adjacent to the tooth to be moved and located on the side away from the gap.
7. The shell-shaped tooth aligner according to claim 1, characterized in that: The extension portion is provided with a reinforcing ridge protruding toward the buccal / lingual side, and the reinforcing ridge extends in the mesiodistal direction.
8. The shell-shaped tooth aligner according to claim 1, characterized in that: The shell-shaped body further includes a second section adjacently arranged to the first section, and the second section has a plurality of tooth receiving cavities for wrapping the other teeth in the dental arch except the teeth wrapped by the first section.
9. The shell-shaped tooth aligner according to claim 8, characterized in that: The edge of the second section is arranged corresponding to the gingival line position.
10. The shell-shaped tooth aligner according to claim 8, characterized in that: The material thickness of the first section is greater than that of the second section, and / or the elastic modulus of the first section is greater than that of the second section.