Shell-shaped dental instrument

Abstract

The utility model discloses a shell-shaped dental instrument which comprises a first shell-shaped body and a second shell-shaped body, the first shell-shaped body and the second shell-shaped body are used for containing an upper dentition and a lower dentition respectively, and the first shell-shaped body and the second shell-shaped body are provided with a guide block and a guide block in a protruding mode in the direction opposite to the jaw on the occlusal face of a rear tooth area respectively. The guide surface of the guide block interacts with the guide surface of the guide block and guides the lower jaw to move from an initial position to a target position in the sagittal direction, an occlusal stabilizing part is arranged on the occlusal surface, facing the opposite jaw, of the guide block, and the occlusal stabilizing part is used for enabling the guide block and the second shell-shaped body to be stably occlusal at the target position in the sagittal direction when the lower jaw moves to the target position. An auxiliary occlusion part is arranged on the occlusal surface, facing the opposite jaw, of the guide block, the surface, facing the opposite jaw, of the auxiliary occlusion part is a plane, or the protruding height of the guide block meets the requirement that when the guide block is located at the target position, a gap is formed between the surface, facing the opposite jaw, of the auxiliary occlusion part and the surface of the corresponding occlusion position of the first shell body of the opposite jaw.

Description

Technical Field

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

[0002] Shell-shaped orthodontic appliances are devices used to treat malocclusion. They are made of safe, elastic, and transparent polymer materials, allowing the orthodontic process to be completed almost imperceptibly. Orthodontic treatment using shell-shaped appliances generally requires multiple successive applications. In some cases, for malocclusions with sagittal jaw position factors, jaw position reconstruction may be necessary at one or more stages of orthodontic treatment to correct the jaw position, achieving mandibular anterior or posterior guidance.

[0003] Currently, shell-shaped orthodontic appliances used for mandibular repositioning, such as TB (short for Twin-block, also known as double-plate appliance), are used to achieve mandibular protrusion or posterior protrusion. TB promotes mandibular bone growth and corrects the misalignment between the maxilla and mandible by functionally moving the mandible forward through an adjusted occlusal incline. The masticatory muscle system must adapt to the new occlusal balance by guiding the mandible into a protruding position; it is typically used to guide chin protrusion. Reverse TB, on the other hand, primarily adjusts the occlusal incline to functionally inhibit mandibular protrusion and promote maxillary development, thus treating reverse occlusion.

[0004] Figure 1 This is a schematic diagram of a common shell-shaped orthodontic appliance used for mandibular prognathism. Figure 1 The shell-shaped orthodontic appliance comprises a first shell-shaped body 1 for accommodating maxillary teeth and a second shell-shaped body 2 for accommodating mandibular teeth. The first shell-shaped body 1 has a protruding portion 3 at the occlusal surface of the posterior teeth region, protruding towards the opposing jaw, to guide and adjust the positional relationship between the maxilla and mandible. The second shell-shaped body has a guide portion 4 at the occlusal surface, which guides the protruding portion 3 to normalize the positional relationship between the maxilla and mandible. The mesial surface 31 of the protruding portion 3 and the distal surface 41 of the guide portion 4 have interacting contact surfaces to guide and adjust the positional relationship between the maxilla and mandible. When the first shell-shaped body 1 and the second shell-shaped body 2 interact, the distal surface 41 of the guide portion 4 guides the mesial surface 31 of the protruding portion 3 to move, thereby achieving the purpose of mandibular protraction.

[0005] Considering that shell-shaped orthodontic appliances are made of polymer materials, they are prone to relative sliding during occlusion. If the occlusal surfaces of the protrusion 3 and guide 4 facing the opposing jaw are smooth planes, they are prone to sliding during occlusion, making it difficult to achieve stable occlusion. To solve this problem, a first retaining part is usually provided on the occlusal surface of the protrusion 3, which can stably contact the second shell-shaped body 2. This first retaining part is, for example, a concave-convex structure composed of cusps and pits on the occlusal surface of the opposing mandibular teeth. At the same time, a first retaining part is also provided on the occlusal surface of the guide 4, which is connected to the first shell-shaped body 2. The second retaining part of the shell-shaped body 1 is in stable contact with the first retaining part. Similarly, the second retaining part is a concave-convex structure composed of the cusps and pits on the occlusal surface of the opposing maxillary teeth. In this way, during the process of wearing the occlusal guide 4, the distal surface 41 guides the mesial surface 31 of the protrusion 3 to move forward in a sagittal direction to the corresponding position. The occlusal surface of the protrusion 3 makes occlusal contact with the corresponding position on the second shell-shaped body 2 through the first retaining part, and the occlusal surface of the guide 4 makes occlusal contact with the corresponding position on the first shell-shaped body 1 through the second retaining part thereon, thereby achieving the purpose of stable occlusion.

[0006] Currently, this method of achieving stable occlusion by setting corresponding retaining parts on the occlusal surfaces of both the protrusion 3 and the guide 4 facing the opposing jaw creates mutual constraints in the occlusal contact between the protrusion 3 and the guide 4 and the opposing jaw. This requires high precision in the manufacturing process, meaning that the first and second retaining parts must be completely consistent with the designed shape in order to match the occlusal surface of the opposing jaw and achieve occlusion as expected. Otherwise, one end may get stuck, causing the occlusion to fail to reach the target position. However, in reality, due to the influence of manufacturing process and precision, the concave and convex shapes of the first retaining part and the second retaining part on the protrusion 3 and the guide part 4 may have certain errors compared with the pre-design. The existence of such errors may cause mutual interference between the occlusal contact between the first retaining part and the occlusal surface of the second shell-shaped body and between the second retaining part and the first shell-shaped body during the occlusal process. This may result in the occlusion of the first shell-shaped body and the second shell-shaped body failing to reach the target position, thus causing the final orthodontic effect to deviate and failing to achieve the expected result. Moreover, there may even be insufficient occlusal stability, leading to mandibular retraction and failing to achieve the purpose of sagittal adjustment of jaw position. Utility Model Content

[0007] The main objective of this invention is to provide a shell-shaped dental instrument that reduces the mutual interference between the guide block and the second shell-shaped body during sagittal occlusion by providing an auxiliary occlusal part on the surface of the guide block facing the opposing jaw. This allows the guide block to smoothly reach the target position during occlusion, and the occlusal stabilizing part on the surface of the guide block facing the opposing jaw enables the guide block and the second shell-shaped body of the opposing jaw to be stably occluded at the target position.

[0008] To achieve the above objectives, this application provides a shell-shaped dental instrument, comprising: a first shell-shaped body and a second shell-shaped body for accommodating the maxillary and mandibular dentitions, respectively. The first shell-shaped body has a guide block protruding towards the opposing jaw at the occlusal surface of the posterior teeth region for adjusting the relative positional relationship between the maxilla and mandible. The second shell-shaped body has a guide block protruding towards the opposing jaw at the occlusal surface of the posterior teeth region, which cooperates with the guide block. When the first shell-shaped body and the second shell-shaped body occlude, the mesial guide surface and distal guide surface of the guide block interact to guide the mandible to move sagittally from an initial position to a target position. The guide block has an occlusal stabilizing portion on the occlusal surface facing the opposing jaw, which is used to stably occlude the guide block and the second shell-shaped body sagittally at the target position when the mandible moves to the target position. The guide block has an auxiliary occlusal portion on the occlusal surface facing the opposing jaw.

[0009] The surface of the auxiliary occlusal part facing the opposing jaw is planar. When occlusion occurs at the target position, the surface of the auxiliary occlusal part facing the opposing jaw is at least partially in contact with the occlusal position corresponding to the first housing body of the opposing jaw; or...

[0010] The protrusion height of the guide block satisfies the following condition: when occlusion is at the target position, the surface of the auxiliary occlusal part facing the opposing jaw has a gap of at least a predetermined height with the surface of the first housing body of the opposing jaw at the corresponding occlusal position.

[0011] Optionally, the length of the guide block along the mesiodistal direction of the patient's dentition covers at least 3 / 4 of the mesiodistal length of all teeth in the posterior region; and the occlusal stabilizing part is a concave-convex structure with the same occlusal anatomical features as the first shell-shaped body posterior region, or the occlusal stabilizing part is a concave-convex structure that matches the concave-convex anatomical features of the occlusal surface of the opposing second shell-shaped body posterior region.

[0012] Optionally, the occlusal stabilizing part is a concave-convex structure with the same occlusal anatomical features as the first shell-shaped body posterior tooth region, or a concave-convex structure that matches the occlusal anatomical features of the second shell-shaped body posterior tooth region of the opposing jaw; and the surface of the occlusal stabilizing part facing the opposing jaw is also provided with a friction part.

[0013] Optionally, the friction part is one or a combination of a structure having a frosted surface, a structure having protrusions, a structure having a hollow surface, or a structure having a perforated surface.

[0014] Optionally, the length of the guide block along the mesiodistal direction of the patient's dentition covers at least 1 / 2 of the total mesiodistal length of all teeth in the posterior region.

[0015] Optionally, when the surface of the auxiliary occlusal part facing the opposing jaw contacts the first shell-shaped body, the surface of the auxiliary occlusal part facing the opposing jaw is a smooth plane.

[0016] Optionally, the width of the surface of the occlusal stabilizing portion facing the opposing jaw in the buccal-lingual direction is less than or equal to the buccal-lingual width of the tooth at the corresponding position of the second housing body of the opposing jaw.

[0017] Optionally, the width of the surface of the occlusal stabilizing portion facing the opposing jaw in the buccal-lingual direction is at least 0.6 times greater than the buccal-lingual width of the tooth at the corresponding position of the second housing body of the opposing jaw.

[0018] Optionally, when the auxiliary occlusal portion contacts the first shell-shaped body, the length of the guide block along the mesiodistal direction of the patient's dentition at least covers the length of the second shell-shaped body portion of the first premolar along the mesiodistal direction.

[0019] Optionally, the gap at the predetermined height is less than 1 / 5 of the distance between the occlusal surface of the teeth at the location of the guide block and the occlusal surface corresponding to the first shell-shaped body.

[0020] Optionally, the guide block is provided with a reinforcing structure to increase the strength of the guide block.

[0021] Optionally, the reinforcing structure includes a reinforcing support portion formed by the buccal and / or lingual surfaces of the guide block being recessed inward or protruding outward. The reinforcing support portion extends through the upper and lower support surface edges of the guide block so that when the shell-shaped dental instrument is worn, the upper and lower support surface edges of the guide block support the corresponding occlusal surfaces respectively to generate an auxiliary support force in the occlusal direction to resist the deformation of the guide block.

[0022] Optionally, the reinforcing structure includes reinforcing ribs disposed on the buccal and / or lingual surfaces of the guide block.

[0023] Optionally, the guide block has a hollow structure, and the reinforcing structure is a filling block built into the guide block.

[0024] Optionally, the guide block is separately formed from the first shell-shaped body, and the guide block has greater rigidity or hardness than the first shell-shaped body. The guide block is fixedly installed on the occlusal surface of the posterior tooth region of the first shell-shaped body.

[0025] Compared with the prior art, this utility model provides a shell-shaped dental instrument. By setting an occlusal stabilizing part on the occlusal surface of the guide block facing the opposing jaw and setting an auxiliary occlusal part on the occlusal surface of the guide block facing the opposing jaw, and setting the surface of the auxiliary occlusal part facing the opposing jaw as a plane or setting it to be spaced apart from the corresponding occlusal position of the first shell body of the opposing jaw when in the target position, the auxiliary occlusal part can reduce the sagittal interference to the occlusal stabilizing part and the second shell body of the opposing jaw during the interaction between the guide block and the guide block and the mandibular sagittal movement. This allows the guide block to smoothly reach the target occlusal position, and the occlusal stabilizing part enables the guide block and the second shell body to stably occlude in the sagittal direction at the target position of the mandibular movement, thereby improving the orthodontic effect of sagittal jaw adjustment. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0027] Figure 1 This is a schematic diagram of a shell-shaped orthodontic appliance used in the prior art to achieve mandibular premolarity.

[0028] Figure 2 This is a schematic diagram of a shell-shaped orthodontic appliance in an ideal occlusal state in the prior art;

[0029] Figure 3 This is a schematic diagram of the actual occlusal state of a shell-shaped orthodontic appliance in the prior art;

[0030] Figure 4 This is a schematic diagram of the structure of the shell-shaped dental instrument according to the first embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the shell-shaped dental instrument in an engaged state in some embodiments of the first embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of one form of the guide surface and the guiding surface in some embodiments of the first embodiment of this utility model;

[0033] Figure 7 This is a schematic diagram of another form of the guide surface and the guiding surface in some embodiments of the first embodiment of this utility model;

[0034] Figure 8 This is a schematic diagram showing the mesial-distal direction length and buccal-tongue direction width of the guide block in some embodiments of the first embodiment of this utility model;

[0035] Figure 9This is a schematic diagram of the shell-shaped dental instrument in an engaged state in some other embodiments of the first embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram showing the protrusion height of the guide block in some embodiments of the first embodiment of this utility model;

[0037] Figure 11 This is a schematic diagram of the cheek-tongue width of the guide block in some embodiments of the first embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram showing the guide block having a friction portion in some embodiments of the first embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the guide block having a reinforced structure in some embodiments of the first embodiment of this utility model;

[0040] Figure 14 This is a schematic diagram of the structure of the guide block having a reinforcing structure in some other embodiments of the first embodiment of this utility model;

[0041] Figure 15 This is a schematic diagram of the structure of the guide block having a reinforcing structure in some other embodiments of the first embodiment of this utility model;

[0042] Figure 16 This is the first embodiment of the present utility model. Figure 14 A schematic diagram of the guide block;

[0043] Figure 17 This is a schematic diagram of the shell-shaped dental instrument of the second embodiment of the present invention in the biting state;

[0044] Figure 18 This is a schematic diagram of the shell-shaped dental instrument according to the third embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0046] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0047] The terms "anterior region" and "posterior region" mentioned in the various embodiments of this application are defined according to the classification of teeth in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. The posterior region includes premolars and molars, teeth marked as 4-8 using the FDI notation, while the anterior region includes teeth marked as 1-3 using the FDI notation. Teeth in the anterior region include central incisors, lateral incisors, and canines.

[0048] The “occlusal plane” mentioned in the various embodiments of this application is obtained according to the definition and confirmation method on page 83 of the 6th edition of Orthodontics. One method is to connect the occlusal midpoint of the first permanent molar with the midpoint between the upper and lower central incisors (at the 1 / 2 point of overbite or open bite); the other method is to divide the occlusal contact points of the posterior teeth equally, and the occlusal contact points of the first permanent molar and the first deciduous molar or the first premolar are often used.

[0049] Current invisible orthodontic technology, for cases of malocclusion with sagittal jaw position factors, typically features a protrusion 3 extending towards the opposing jaw at the occlusal surface of the first shell-shaped body 1 accommodating the maxillary dentition, and a guide 4 extending towards the opposing jaw at the occlusal surface of the second shell-shaped body 2 accommodating the mandibular dentition. During occlusion, the protrusion 3 and guide 4 interact to achieve sagittal adjustment of the maxillary and mandibular positions. Simultaneously, to ensure stable occlusion at the target position, a first retainer is provided on the protrusion 3 facing the opposing occlusal surface, and a second retainer is provided on the guide 4 facing the opposing occlusal surface, ensuring stable occlusion with the opposing jaw. The first and second retainers are concave-convex structures composed of cusps and fissures on the occlusal surface of the corresponding opposing teeth. The stable occlusion achieved through the first and second retainers is as follows: Figure 2 As shown.

[0050] However, the inventors of this application have discovered that, in order to achieve the engagement of the first shell-shaped body 1 and the second shell-shaped body in such a way... Figure 2The intended target position requires that the shapes of the first and second retainers facing the occlusal surface of the opposing jaw be completely consistent with the design. This places high demands on the manufacturing process and precision. However, in reality, due to the influence of the manufacturing process and precision, the concave and convex shapes of the first and second retainers on the protrusion 3 and guide 4 facing the occlusal surface often have certain errors compared to the pre-design. These errors cause mutual interference between the occlusal contact between the first retainer and the second shell-shaped body, and between the second retainer and the first shell-shaped body, during the sagittal movement of the protrusion 3. This results in the first and second shell-shaped bodies failing to reach the target position during occlusal engagement. For example, the second retainer may not reach the target position of the opposing jaw and may become stuck. In this case, the protrusion 3 cannot continue to move forward in the sagittal direction, thus preventing both the first and second retainers from reaching the target position. Figure 3 As shown, it is also possible that the first retaining part is stuck in a non-target position with the opposing jaw. In this case, the protrusion 3 cannot continue to move forward in the sagittal direction, and of course, the second retaining part cannot continue to move forward either. Thus, neither the first nor the second retaining part can occlude at the target position. When the second retaining part fails to occlude at the target position of the opposing jaw and locks in place, it is because the first retaining part and the second shell-like body of the opposing jaw have not occluded properly, such as... Figure 3 As shown, an unstable bite can also lead to mandibular retraction, making it impossible to achieve the goal of mandibular protraction.

[0051] It is evident that the reason why the protrusion and guide portion often fail to occlude at the target position in the existing technology is due to the mutual constraint between the occlusal contact between the first retaining portion of the protrusion and the occlusal surface of the second shell-shaped body, and between the occlusal contact between the second retaining portion of the guide portion and the first shell-shaped body. When the shape of the first retaining portion and the second retaining portion cannot perfectly match the designed shape due to the influence of manufacturing process and precision, mutual interference will occur in the contact with the occlusal surface of the opposing jaw. Theoretically, the problem of mutual interference can be solved by reducing the occlusal interference of one end on the other end. However, simply and crudely reducing the occlusal interference of one end on the other end may lead to problems with unstable sagittal occlusion. The inventors of this application have discovered that, in sagittal jaw position adjustment, the protrusion 3 of the first shell-shaped body 1, which guides the mandible and accompanies the maxillary teeth, is larger than the guiding portion 4 of the second shell-shaped body 2, which accompanies the mandible. This protrusion plays a more crucial role in the sagittal adjustment process. Therefore, if an occlusal stabilizing portion is designed on the occlusal surface of the protrusion 3 facing the opposing jaw to generate greater friction when occluding with the opposing jaw, the protrusion and the second shell-shaped body can stably occlude in the target position in the sagittal direction. Thus, this utility model... The design reduces interference with the occlusion of the guide block protruding from the posterior tooth region of the first shell-shaped body and the second shell-shaped body during the sagittal movement of the mandible to the target position by providing an auxiliary occlusal part on the surface of the guide block facing the opposing jaw. This allows the guide block to smoothly reach the target position during occlusion. At the same time, an occlusal stabilizing part is provided on the occlusal surface of the guide block facing the opposing jaw, so that the guide block and the second shell-shaped body can stably occlude at the target position in the sagittal direction, thereby achieving the purpose of sagittal jaw position adjustment.

[0052] Therefore, this utility model proposes a shell-shaped dental instrument, comprising: a first shell-shaped body and a second shell-shaped body for respectively accommodating the maxillary and mandibular dentitions; the first shell-shaped body having a guide block protruding towards the opposing jaw at the occlusal surface of the posterior teeth for adjusting the relative positional relationship between the maxilla and mandible; the second shell-shaped body having a guide block protruding towards the opposing jaw at the occlusal surface of the posterior teeth, which cooperates with the guide block; when the first shell-shaped body and the second shell-shaped body occlude, the mesial guide surface of the guide block and the guide block... The distal guiding surfaces of the guide block interact and guide the mandible to move sagittally from its initial position to the target position. The guide block has an occlusal stabilizing portion on its occlusal surface facing the opposing jaw. This occlusal stabilizing portion is used to ensure stable sagittal occlusion of the guide block and the second shell-shaped body at the target position when the mandible moves to it. The guide block also has an auxiliary occlusal portion on its occlusal surface facing the opposing jaw. The surface of the auxiliary occlusal portion facing the opposing jaw is planar. When occlusally occluded at the target position, the surface of the auxiliary occlusal portion facing the opposing jaw is planar with the opposing jaw's... The first shell body has at least partial contact with the corresponding occlusal position; or, the protrusion height of the guide block satisfies the following: when occlusal at the target position, the surface of the auxiliary occlusal part facing the opposing jaw has a gap of at least a predetermined height with the surface of the first shell body of the opposing jaw corresponding to the occlusal position. This utility model provides an occlusal stabilizing part on the guide block of the first shell body facing the opposing jaw and an auxiliary occlusal part on the guide block of the second shell body facing the opposing jaw. At the same time, the surface of the auxiliary occlusal part facing the opposing jaw is set as a plane or is set to have a gap with the corresponding occlusal position of the first shell body of the opposing jaw when at the target position. This allows the auxiliary occlusal part to reduce sagittal interference to the occlusal stabilizing part and the second shell body of the opposing jaw during the interaction between the guide blocks and the guide block and the sagittal movement of the mandible. This allows the guide block to reach the target occlusal position smoothly, and the occlusal stabilizing part allows the guide block and the second shell body to stably occlude at the target position in the sagittal direction, thereby improving the orthodontic effect of sagittal jaw adjustment.

[0053] The implementation details of the shell-shaped dental instrument described in this application will be specifically described below with reference to specific embodiments. The following implementation details are provided for ease of understanding only and are not necessary for implementing this solution.

[0054] like Figure 4 and Figure 5As shown, the first embodiment of this utility model provides a shell-shaped dental instrument. This shell-shaped dental instrument is used for mandibular pre-guided dental work and includes: a first shell-shaped body 21 for accommodating the maxillary dentition and a second shell-shaped body 22 for accommodating the mandibular dentition. The first shell-shaped body 21 has a guide block 210 protruding towards the opposing jaw at the occlusal surface of the posterior teeth for adjusting the relative positional relationship between the maxilla and mandible. The second shell-shaped body 22 has a guide block protruding towards the opposing jaw at the occlusal surface of the posterior teeth, which cooperates with the guide block 210. 220, the guide block 210 has a guide surface 211 located on the mesial side of the guide block 210, and the guide block 220 has a guide surface 221 located on the distal side of the guide block 220. When the patient wears the shell-shaped dental instrument and bites, the guide surface 211 of the guide block 210 abuts against the guide surface 221 of the guide block 220, and the guide block 210 applies a forward force to the guide block 220, guiding the guide block 220 to move forward in the sagittal direction, thereby stimulating the condylar joint of the mandibular teeth and guiding the mandible. The guide block 220 moves sagittally from its initial position to its target position, allowing the first shell-shaped body and the second shell-shaped body to engage in sagittal engagement at the target position. The initial position is the position of the mandible before jaw adjustment, and the target position is the position the mandible is adjusted to. The guide block 210 has an occlusal stabilizing part 212 on its occlusal surface facing the opposing jaw, ensuring stable sagittal engagement between the guide block 210 and the second shell-shaped body 22 at the target position. The guide block 220 also has an auxiliary part on its occlusal surface facing the opposing jaw. The occlusal assist 222 has a surface facing the opposing jaw that is spaced apart from the corresponding occlusal position of the first shell body 21 during the occlusal state. In other words, the protrusion height of the guide block 220 should satisfy the following: when occlusal at the target position, the surface of the occlusal assist facing the opposing jaw has a gap of at least a predetermined height with the surface of the first shell body 21 at the corresponding occlusal position of the opposing jaw, thereby ensuring that the occlusal assist does not contact the first shell body 21 during the movement of the mandible from the initial position to the target position. Figure 5As shown, when the patient wears the shell-shaped dental instrument for occlusion, the guide block 210 guides the mandible to move sagittally from its initial position to the target position during occlusion. The occlusal stabilizing part 212 maintains stable contact with the surface of the corresponding occlusal position on the second shell-shaped body 22. During this process, since the surface of the auxiliary occlusal part 222 of the guide block 220 does not contact the surface of the corresponding position on the first shell-shaped body, there is no interference to the sagittally movement of the guide block 210 caused by the occlusal contact (e.g., concave-convex matching contact or friction) between the guide block and the first shell-shaped body. This reduces the sagittally interference of the guide block on the occlusal process of the guide block 210 and the second shell-shaped body 22, which is present in the prior art. This facilitates the guide block guiding the mandible to the target position smoothly. Simultaneously, the occlusal stabilizing part ensures stable occlusion between the occlusal stabilizing part and the corresponding occlusal position of the opposing second shell-shaped body in the sagittal direction, thereby allowing the first shell-shaped body and the second shell-shaped body to stably occlude in the target position in the sagittal direction, improving the orthodontic effect.

[0055] Both the first shell-shaped body 21 and the second shell-shaped body 21 have multiple tooth receiving cavities to receive maxillary and mandibular teeth respectively. Each tooth receiving cavity or part of the tooth receiving cavity can have orthodontic function, that is, the geometry of the receiving cavity can be the same as the orthodontic target of the corresponding tooth, so that the corresponding tooth can be gradually moved to the orthodontic target through the elastic deformation of the shell with the corresponding geometry. That is, the shell-shaped dental instrument of this utility model can perform orthodontic treatment while adjusting the relative position relationship of the upper and lower jaws. Of course, each tooth receiving cavity can also only have the function of wrapping the teeth without orthodontic function. In this case, the geometry of each receiving cavity without orthodontic function is the same as the current state of the corresponding tooth. In this case, the shell-shaped dental instrument of this utility model is only used to adjust the relative position relationship of the upper and lower jaws.

[0056] In this embodiment, the guide surface 211 of the guide block 210 is located on the mesial side of the guide block 210, and the guide surface 221 of the guide block 220 is located on the distal side of the guide block 220. In some embodiments, the guide surface 211 and the guide surface 221 are a single inclined surface, and the guide surface 211 and the guide surface 221 are relatively parallel. The single inclined surface and parallel guide surface make the sagittal movement of the mandible more flexible and allow the mandible to move to the target position. The acute angle between the guide surface 211 and the guide surface 221 and the occlusal plane is the same. Preferably, the angle α1 between the guide surface 211 and the guide surface 221 and the occlusal plane can be less than or equal to 65 degrees and greater than or equal to 15 degrees. Figure 6 As shown; in other embodiments, either the guiding surface 211 or the guiding surface 221 may include two inclined surfaces with different angles, such as Figure 7As shown, the guide surface 211 is not a monolithic inclined surface, but includes a first inclined surface 2111 and a second inclined surface 2112. The first inclined surface 2111 is positioned close to the opposing jaw, and the end of the second inclined surface 2112 near the first inclined surface is connected to the end of the first inclined surface away from the opposing jaw. The end of the second inclined surface near the surface of the orthodontic appliance is the end of its corresponding functional surface near the surface of the orthodontic appliance. The angle α2 between the first inclined surface and the occlusal plane is equal to the angle α3 between the second inclined surface and the occlusal plane. This embodiment, by designing two inclined surfaces, changes the acute angle between the guide surface 211 and the occlusal plane, extending the length of the guide surface 211 and thus extending the relative movement distance between the upper and lower jaws. Of course, besides changing the shape of the guide surface 211, the shape of the guide surface 221 relative to the occlusal plane can also be changed, or similar changes can be made to the shapes of both the guide surface 211 and the guide surface 221; this invention is not limited to these limitations.

[0057] In some embodiments, the morphology of the guide surface 211 and the guide surface 221 can be further improved, for example, by changing the morphology of the guide surface 211 and the guide surface 221 to include serrated working surfaces, so as to increase the friction when the two are in contact and improve the ability to maintain stable occlusion during the sagittal migration of the mandible to the target position.

[0058] In this embodiment, since the auxiliary occlusal portion 222 of the guide block 220 does not contact the occlusal surface of the first shell-shaped body 21 during the biting process, all the occlusal support depends entirely on the guide block 210. At this time, the guide block 210 not only needs to provide the sagittal movement force of the mandibular pretoria, but also needs to ensure that the second shell-shaped body of the opposing jaw can stably occlude in the target position in the sagittal direction in the occlusal direction. Therefore, the guide block 210 should have sufficient support force to support the occlusion and provide the sagittal movement force of the mandibular pretoria, so as to have a surface sufficient to make occlusal contact with the second shell-shaped body of the opposing jaw at the corresponding occlusal position. At the same time, an occlusal stabilizing portion 212 needs to be provided on its surface facing the opposing jaw to ensure that it can stably occlude in the target position in the sagittal direction with the opposing jaw. In some embodiments, in order for the guide block 210 to provide sufficient support and sagittal movement force, the length l of the guide block 210 along the mesiodistal direction of the patient's dentition should at least cover 3 / 4 of the total mesiodistal length L of all teeth (teeth 4-8 or 4-7) in the posterior region, such as... Figure 8As shown, the total mesiodistal length L of all teeth in the posterior region can be the sum of the maximum mesiodistal length of each tooth, or it can be the distance between the intersection of the centroids of all teeth and the central axis, with the distance between the intersection of the posterior teeth and the central axis serving as the total mesiodistal length L of all teeth in the posterior region. The guide block 210 may be irregular in shape. The length l of the guide block 210 along the mesiodistal direction of the patient's dentition can be the maximum length of the guide block 210 along the mesiodistal direction, or it can be the length along the mesiodistal direction passing through the centroid of the guide block 210. In this embodiment, the guide block 210 is designed to have sufficient length along the mesiodistal direction of the patient's dentition, so that the guide block 210 can provide sufficient and stable support for the upper and lower jaw teeth in the occlusal direction. Correspondingly, the occlusal stabilizing part 212 it provides will also have a surface that is sufficiently in contact with the second shell-shaped body of the opposing jaw at the corresponding occlusal position, which can generate sufficient friction to ensure sagittal occlusal stability.

[0059] In this embodiment, the occlusal stabilizing part 212 of the guide block 210 is designed with a concave-convex structure facing the opposing jaw to stably engage with the occlusal surface of the second shell-shaped body 22. In some embodiments, the occlusal stabilizing part 212 is a concave-convex structure that matches the occlusal anatomical features of the occlusal surface corresponding to the posterior tooth region of the second shell-shaped body 22 of the opposing jaw. The occlusal anatomical features refer to the concave-convex structure composed of cusps and fissures on the occlusal surface of the teeth. Here, the occlusal anatomical features corresponding to the posterior tooth region of the second shell-shaped body refer to the occlusal anatomical features of the occlusal surface of the teeth in the posterior tooth region of the second shell-shaped body 22 corresponding to the guide block 210 in the occlusal state. Thus, when the patient wears the shell-shaped dental instrument and performs occlusal, because the concave-convex structure of the surface of the occlusal stabilizing part 212 of the guide block 210 matches the occlusal anatomical features of the occlusal surface of the posterior tooth region of the second shell-shaped body 22, when the mandible moves to the target position, the occlusal stabilizing part 212 contacts the occlusal surface of the corresponding position in the posterior tooth region of the second shell-shaped body 22, achieving occlusal stability. The occlusal stabilizing part 212 matches the corresponding position of the posterior tooth region of the second shell-shaped body 22, resulting in a tighter fit and improved sagittal occlusal stability. In other embodiments, the occlusal stabilizing part 212 is a concave-convex structure with the same occlusal anatomical features as the occlusal surface of the posterior tooth region of the first shell-shaped body 21 of the jaw. Here, the occlusal anatomical features of the occlusal surface of the posterior tooth region of the first shell-shaped body are the occlusal anatomical features of the occlusal surface of the teeth in the posterior tooth region of the first shell-shaped body covered by the guide block 210. Thus, when the patient wears the shell-shaped dental instrument for occlusion, since the concave-convex structure on the surface of the occlusal stabilizing part 212 of the guide block 210 is the same as the occlusal anatomical features of the occlusal surface of the posterior tooth region of the first shell-shaped body 22, when the mandible moves to the target position, the occlusal stabilizing part 212 and the corresponding position of the occlusal surface of the posterior tooth region of the second shell-shaped body 22 make contact. The concave-convex structure on the occlusal stabilizing part 212 and the posterior tooth region of the second shell-shaped body 22 form a cusp-fossa stable occlusal concave-convex structure, which is tightly combined, resulting in stronger sagittal occlusal stability.

[0060] In this embodiment, besides designing the guide block 210 to have sufficient length to provide sufficient support and sagittal movement force for mandibular premotor guidance, thereby ensuring that the occlusal stabilizing portion has sufficient surface for occlusal contact with the second shell-shaped body of the opposing jaw at the corresponding occlusal position to guarantee sagittal occlusal stability with the opposing jaw, the support force of the guide block 210, the provision of sagittal movement force for mandibular premotor guidance, and the sagittal stable occlusion with the opposing jaw can be further enhanced by designing the buccal-lingual width of the guide block 210 for supporting the opposing teeth. In some embodiments, the occlusal stabilizing portion 212 for stable occlusion with the second shell-shaped body 22 of the opposing jaw has a buccal-lingual width w1 on its surface facing the opposing jaw that is at least 0.6 times greater than the buccal-lingual width W1 of the teeth at the corresponding position of the second shell-shaped body 22 of the opposing jaw. Figure 8As shown, since the occlusal stabilizing part 212 is not necessarily a regular shape, the width of its surface facing the opposing jaw is not uniform. It can be that the width at each position is greater than 0.6 times the buccal-lingual width W1 of the tooth at the corresponding position of the second housing body 22 of the opposing jaw, or the average width of its surface facing the opposing jaw is at least greater than 0.6 times the maximum buccal-lingual width of the tooth at the corresponding position of the second housing body 22 of the opposing jaw. By limiting the buccal-lingual width of the surface of the occlusal stabilizing part 212 used for occlusal contact with the opposing jaw, on the one hand, the guide block 210 has a sufficient width to be fully supported on the anatomical surface of the opposing tooth, thereby having sufficient support force, and on the other hand, it also has sufficient friction force to maintain occlusal stability. Generally speaking, the larger the width w1 of the surface of the occlusal stabilizing part 212 facing the opposing tooth in the buccal-lingual direction, the larger the surface area used to support the opposing tooth in the anatomical direction, the greater the supporting capacity of the guide block 210, the larger the occlusal contact area, the greater the frictional force generated, and the more stable the occlusion. However, if the width w1 of the surface of the occlusal stabilizing part 212 facing the opposing tooth in the buccal-lingual direction is greater than the buccal-lingual width W1 of the tooth at the corresponding position of the second shell body 22 of the opposing tooth, some parts of the occlusal stabilizing part 212 will not be able to support the opposing tooth in the anatomical direction. This will not only easily lead to the guide block 210 being bitten, but the part exceeding the width of the opposing tooth will easily cause discomfort to the patient and affect the patient's wearing. Of course, in order to provide sufficient support for the guide block 210 during occlusion, the guide block 210 also needs to have a certain buccal-lingual width on the maxillary teeth. Similarly, the buccal-lingual width of the guide block 210 covering the maxillary teeth is at least 0.6 times greater than the buccal-lingual width of the teeth at the corresponding position of the first shell body 21 of the maxilla, but less than or equal to the buccal-lingual width of the teeth at the corresponding position. This will not be elaborated here.

[0061] In this embodiment, since the auxiliary occlusal portion 222 does not contact the first shell-shaped body 21 of the opposing jaw during occlusion, the shape of the surface of the auxiliary occlusal portion 222 facing the opposing jaw does not affect the occlusion of the upper and lower teeth. Therefore, the surface of the auxiliary occlusal portion 222 facing the opposing jaw can be a planar structure, such as... Figure 4 As shown, or it could be a curved structure, such as Figure 9 As shown, or it may be a concave-convex structure with the same anatomical features as the occlusal surface of the corresponding position of the first shell-shaped body 21 or the second shell-shaped body 22 in the posterior tooth region. Regardless of the structure, as long as the surface of the auxiliary occlusal part 222 facing the opposing jaw has a set gap value with the corresponding position of the first shell-shaped body 21 of the opposing jaw during occlusion.

[0062] In this embodiment, although the guide block 220 with the auxiliary occlusal part 222 does not contact the opposing teeth and does not directly provide support for the opposing teeth, the sagittal forward movement of the mandible requires the interaction between the guide surface 211 of the guide block 210 and the guide surface 221 of the guide block 220. Therefore, in order to achieve the purpose of sagittal forward movement of the mandible, the guide surface 221 of the guide block 220 and the guide surface 211 should ensure a certain size of interaction area. This requires that the size of the guide surface 221 cannot be too small, and the size of the guide surface 221 depends on the protrusion height (or gingival-occlusal height) and buccal-lingual width of the guide block 220. In some embodiments, to ensure that the guide surface 221 of the guide block 220 has sufficient dimensions to interact with the guide surface of the guide block 210, in this embodiment, as long as the surface of the auxiliary occlusal portion 222 of the guide block 220 facing the opposing jaw does not contact the surface of the corresponding occlusal position of the first housing body 21 of the opposing jaw, that is, there is a gap between the surface of the auxiliary occlusal portion 222 facing the opposing jaw and the surface of the corresponding occlusal position of the first housing body 21 of the opposing jaw, the protrusion height of the guide block 220 (e.g., Figure 10 As shown, the higher the better. The gap between the surface of the auxiliary occlusal part 222 facing the opposing jaw and the surface of the first housing body 21 at the corresponding occlusal position refers to the gap between the highest point of the surface of the first housing body 21 at the corresponding occlusal position (the point further away from the gingiva is higher) and the corresponding occlusal position of the first housing body 21. This gap has a predetermined height. To ensure the force between the guide surface 221 and the guide surface 211 of the guide block 220, the predetermined height should be chosen as small as possible. In some examples, the predetermined height should be at least less than the distance between the guide block 220 and the first housing body 21 of the opposing jaw at the target position. The distance d between corresponding positions is 1 / 5, where the distance d can be the average of the distances between multiple points on the occlusal surface of the tooth at the target position where the guide block 220 is located and the corresponding points on the first shell body 21 of the opposing jaw, or the distance between the highest point of the first shell body 21 at the corresponding position and the corresponding position on the occlusal surface of the tooth at the position where the guide block 220 is located. In other embodiments, to ensure that the guide surface 221 of the guide block 220 has sufficient dimensions to interact with the guide surface of the guide block 210, the buccal-lingual width w2 of the guide block 220 should be greater than or equal to the buccal-lingual width W2 of the tooth of the second shell body 22 covered by the guide block 220 (e.g., ...). Figure 11 The guide surface 221 of the guide block 220 is 0.6 times larger than the guide surface 211 of the guide block 210, and is less than or equal to the buccal-lingual width W2 of the tooth where the guide block 220 is located, thereby ensuring that the guide surface 221 of the guide block 220 has a certain size that interacts with the guide surface 211 of the guide block 210, so as to achieve the purpose of guiding the mandibular sagittal movement.

[0063] Considering that, compared to existing technologies, in this embodiment, since there is no constraint formed by the guide block 220 and the opposing jaw occlusal contact, the occlusal contact between the occlusal stabilizing part 212 of the guide block 210 and the opposing second shell-shaped body 22 may be insufficient in some cases to achieve the purpose of stabilizing the upper and lower jaws in the sagittal direction at the target position. To further increase the stability of the sagittal occlusal contact between the guide block 210 and the opposing second shell-shaped body when the mandible is guided to the target position by the guide block 210 and guide block 220, in some preferred embodiments, the surface of the occlusal stabilizing part 212 is further provided with a friction part for enhancing stable contact. In some examples, the friction part of the occlusal stabilizing part 212 can be configured with a structure having a frosted surface, such as... Figure 12 As shown, to increase its friction, in some examples, the friction part of the engagement stabilizing part 212 may also be a structure with a hollow surface, a structure with protrusions, or a structure with a perforated surface; in still other examples, the friction part of the engagement stabilizing part 212 may also be a combination of two or more of the following structures: a structure with a frosted surface, a structure with protrusions, a structure with a hollow surface, and a structure with a perforated surface. By changing the structure of the surface of the engagement stabilizing part 212, the modified structure can increase the friction generated during engagement, further improving the stability of the sagittal engagement between the guide block and the second shell-shaped body at the target position.

[0064] In some preferred embodiments, based on increasing occlusal stability by providing a friction portion on the surface of the occlusal stabilizing portion 212, the length of the guide block 210 in the mesiodistal direction can be reduced. In this case, the length of the guide block 210 in the mesiodistal direction can cover at least 1 / 2 of the total length of all teeth in the posterior region in the mesiodistal direction. Reducing the length of the guide block 210 in the mesiodistal direction can reduce the patient's foreign body sensation and improve wearing comfort.

[0065] In some embodiments, the guide block 210 and the first shell-shaped body 21 on which it is located are integrally formed. In practical applications, this integral structure can be obtained through thermoforming or direct 3D printing. In this embodiment, due to the gap between the auxiliary occlusal part 222 and the corresponding position of the first shell-shaped body of the opposing jaw, the occlusal force generated by occlusion is mainly loaded on the guide block 210, making the guide block 210 easily damaged. Therefore, it is necessary to increase the strength of the guide block 210. In some embodiments, the guide block 210 is further provided with a reinforcing structure to enhance the strength of the guide block 210, such as... Figure 13As shown, the reinforcing structure is a reinforcing rib 213 provided on the buccal and / or lingual side of the guide block 210. That is, the reinforcing rib 213 can be provided on both the lingual and buccal sides, or only on the lingual side, or only on the buccal side. The reinforcing rib can be concave-convex and convex, and is provided along the long axis of the tooth, which can increase the resistance to deformation in the long axis direction and reduce the risk of the guide block 210 being bitten.

[0066] When the guide block is integrally formed with the first shell-shaped body 21, the guide block 210 is often a hollow structure. At this time, the reinforcing structure can also be a filler built into the guide block 210. The shape of the filler is consistent with the inner diameter of the guide block 210. By building a filler into the hollow guide block 210, the strength of the guide block 210 is increased to improve its resistance to deformation, which is simple and efficient.

[0067] In some embodiments, the reinforcing structure may also include a reinforcing support portion 214 formed by the buccal surface 2101 and / or the lingual surface 2102 of the guide block, which is recessed inward or protrudes outward. The reinforcing support portion 214 extends through the upper and lower support surface edges of the guide block, so that when the shell-shaped dental appliance is worn, the upper and lower support surface edges of the guide block 210 respectively support the corresponding occlusal surfaces to generate an auxiliary supporting force in the occlusal direction to resist deformation of the guide block 210. Figure 14 As shown, the guide block 210 is provided with a reinforcing support portion 214 that increases the upper and lower support contour edges of the guide block 210. The upper support contour is the contour of the surface facing the opposing jaw, and the lower support contour is the contour of the surface covering the second shell-like body in contact with it. The reinforcing support portion 214 is formed by the buccal surface 2101 and / or the lingual surface 2102 of the guide block 214, which are recessed inward or protruded outward. Figure 14 To form a reinforced support portion 214 that is recessed inward, such as Figure 15The reinforcing support 214 is formed by protruding outwards and extends through the upper and lower support contour edges of the guide block 214. That is, the reinforcing support 214 extends from the upper contour edge of the guide block 210 to the lower contour edge of the guide block 210, as shown in 16. Since the reinforcing support 214, whether it is recessed inwards or protruding outwards, will form a height difference with its surface, it has a larger bending section modulus under the same shell-shaped appliance thickness. Without the height difference, the side surface of the guide block 210 is a relatively flat and thin surface, which is prone to buckling and crushing under pressure. The greater the height difference, the greater the bending section modulus and the greater the stiffness of the guide block 210. Thus, when the shell-shaped dental instrument is worn, the upper and lower support contour edges of the guide block 210 support the occlusal surfaces of the teeth at the corresponding positions of the second shell-shaped body 22 of the opposing jaw and generate an auxiliary support force in the occlusal direction to resist the deformation of the guide block 210.

[0068] In some preferred embodiments, the lip and / or buccal sides of the guide block 210 have multiple reinforcing supports, such as Figures 14-16 As shown, the distance between the multiple reinforcing support parts is equal, so that the support force provided by the upper support contour edge and the lower support contour edge of the guide block 210 in the biting direction / vertical direction is evenly distributed, so that there are no areas with weak support force in the guide block 210, and avoid the upper support contour edge and the lower support contour edge of the guide block from generating weak support force and deforming in the weak area.

[0069] In other embodiments, in order to make the guide block 210 have a stronger resistance to deformation, the guide block 210 and the first shell-shaped body 21 may not be integrally formed, and the guide block 210 has greater rigidity or hardness than the first shell-shaped body 21. The guide block 210 may be made of materials with greater mechanical strength, such as composite resin, glass ionomer, ceramic or self-curing plastic materials, and then fixedly installed on the corresponding occlusal surface of the posterior tooth area of ​​the first shell-shaped body 21 by any means such as bonding, welding, riveting.

[0070] like Figure 17As shown, the second embodiment of this utility model also provides a shell-shaped dental instrument for mandibular premaxillary guidance. The only difference from the embodiments of the first embodiment is that, in this second embodiment, the surface of the auxiliary occlusal portion 222 of the guide block 220 facing the opposing jaw is a plane. When occlusion is at the target position, the surface of the auxiliary occlusal portion facing the opposing jaw is at least partially in contact with the occlusal position corresponding to the first shell body of the opposing jaw. At this time, the guide block 220 is in contact with the first shell body of the opposing jaw, providing support for occlusion in the occlusal state, reducing the support pressure on the guide block 210, and reducing the risk of the guide block 210 being bitten. At the same time, since the surface of the auxiliary occlusal portion 222 facing the opposing jaw is a planar structure, compared with the case in the prior art where the surface of the guide block 220 facing the opposing jaw is a retaining portion, the frictional force generated is very small, and the constraint on the movement of the guide block 210 is very small. This greatly reduces the occlusal interference between the guide block 210 and the second shell body 22 of the opposing jaw during occlusion, reduces the possibility of not reaching the target position during occlusion, and improves the orthodontic effect.

[0071] In some preferred embodiments, to further reduce the constraint of the guide block 210 on the occlusion caused by the frictional force generated when the auxiliary occlusal part 222 occludes with the opposing jaw, the surface of the auxiliary occlusal part 222 facing the opposing jaw and in contact with the first shell-shaped body 21 is a smooth plane. Since the shell-shaped orthodontic appliance is made of polymer material, the smooth plane of the auxiliary occlusal part 222 facing the opposing jaw will have a small coefficient of friction, thereby generating very little friction during occlusion and reducing the sagittal interference on the occlusion of the guide block 210 and the second shell-shaped body 21 of the opposing jaw.

[0072] In this embodiment, patients requiring mandibular premolar guidance often have a deep Spee curve. To provide better support for the guide block 220, this embodiment places the guide block 220 at the deepest point of the Spee curve. Therefore, in some embodiments, the length of the guide block 220 along the mesiodistal direction of the patient's dentition at least covers the mesiodistal length of a portion of the first premolar in the second shell-shaped body 22. That is, the first premolar, i.e., tooth number 4, is the deepest point of the Spee curve, and the guide block 220 positioned here provides better support during occlusion. In some preferred embodiments, considering that the guide block 220 covering only the mesiodistal length of the first premolar is relatively thin, its length can be extended to at least partially cover the adjacent canines.

[0073] like Figure 18As shown, the third embodiment of this utility model provides a shell-shaped dental instrument for guiding the mandible backward. The shell-shaped dental instruments in the foregoing embodiments of this utility model are all used for mandibular anterior guidance. However, it is understood that by changing the relative positions of the guide block 210 and the guide block 220, the purpose of guiding the mandible backward can be achieved. That is, to achieve mandibular anterior guidance, the guide block 220 is located on the mesial side of the guide block 210, while to guide the mandible backward, the guide block 220 is located on the distal side of the guide block 210. Other designs, except that the guide block 220 cannot cover the mesial-distal length of the first premolar portion of the second shell-shaped body 22, can refer to the designs in the foregoing embodiments, and will not be repeated here.

[0074] The fourth embodiment of this utility model provides a dental orthodontic system, which includes N sets of orthodontic appliances for progressively moving a patient's dentition from an initial layout to a target layout. The N sets of orthodontic appliances include at least M sets of shell-shaped dental instruments as described above, where N is greater than or equal to M, and M is greater than 1. That is, in the N orthodontic stages of moving the patient's dentition from the initial layout to the target layout using the N sets of orthodontic appliances, M of the stages are for adjusting the intermaxillary relationship. During the intermaxillary relationship adjustment stages, malocclusion can be treated simultaneously, achieving simultaneous orthodontic treatment, or only the intermaxillary relationship can be adjusted without simultaneous treatment of the malocclusion.

[0075] In some embodiments, the height of the guide block protruding in the occlusal direction on the shell-shaped dental instrument of the above-mentioned M group gradually decreases during the orthodontic process. For example, in a three-stage orthodontic treatment involving intermaxillary relationship adjustment, each stage uses shell-shaped dental instruments with guide blocks and guide blocks of different protrusion heights to adjust the intermaxillary relationship of the patient's dentition. Assume the shell-shaped dental instrument used in the second stage is the same as the one used after the first stage, and the shell-shaped dental instrument used in the third stage is the same as the one used after the second stage. In the second stage, the protrusion height of the guide blocks and guide blocks towards the opposing jaw is less than that of the guide blocks and guide blocks towards the opposing jaw in the first stage, while the protrusion height of the guide blocks and guide blocks towards the opposing jaw in the third stage is less than that of the guide blocks and guide blocks towards the opposing jaw in the second stage. These three stages can be adjacent or non-adjacent. By gradually reducing the height of the guide blocks and guide blocks after opening the bite, the dentition is gradually leveled, achieving the final orthodontic goal.

[0076] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A shell-shaped dental instrument comprising: First and second shell bodies for accommodating maxillary and mandibular dentitions respectively, characterized in that the first shell body is provided with a guide block protruding in the direction of the opposite jaw at the position of the occlusal surface of the posterior teeth for adjusting the relative position between the upper and lower jaws, and the second shell body is provided with a guide block protruding in the direction of the opposite jaw at the position of the occlusal surface of the posterior teeth for cooperating with the guide block, when the shell dental appliance is worn, the guide surface of the guide block and the guide surface of the guide block interact and guide the mandible to move sagittally from the initial position to the target position, the occlusal surface of the guide block facing the opposite jaw is provided with an occlusal stabilizing part for stabilizing the sagittal occlusion of the guide block and the second shell body at the target position when the mandible moves to the target position, and the occlusal surface of the guide block facing the opposite jaw is provided with an auxiliary occlusal part, wherein the surface of the auxiliary occlusal part facing the opposite jaw is a plane, and when occluded at the target position, the surface of the auxiliary occlusal part facing the opposite jaw at least partially contacts the surface of the corresponding occlusal position of the first shell body of the opposite jaw; or the protrusion height of the guide block satisfies: when occluded at the target position, the surface of the auxiliary occlusal part facing the opposite jaw and the surface of the corresponding occlusal position of the first shell body of the opposite jaw have a gap of at least a predetermined height.

2. The shell-like dental instrument of claim 1, wherein, The length of the guide block along the mesial-distal direction of the patient's dentition covers at least 3 / 4 of the length of all teeth in the posterior teeth region in the mesial-distal direction; and the occlusal stabilizing part is a concave-convex structure identical to the corresponding occlusal surface anatomical features of the first shell body in the posterior teeth region, or the occlusal stabilizing part is a concave-convex structure matching the concave-convex structure of the corresponding occlusal surface anatomical features of the second shell body of the opposite jaw in the posterior teeth region.

3. The shell-like dental instrument of claim 1, wherein, The occlusal stabilizing part is a concave-convex structure identical to the corresponding occlusal surface anatomical features of the first shell body in the posterior teeth region, or a concave-convex structure matching the concave-convex structure of the corresponding occlusal surface anatomical features of the second shell body of the opposite jaw in the posterior teeth region; and the surface of the occlusal stabilizing part facing the opposite jaw is further provided with a friction part.

4. The shell-like dental instrument of claim 3, wherein, The friction part is one or a combination of the following structures: a structure with a sanding surface, a structure with protrusions, a structure with a hollow surface, or a structure with a hole surface.

5. The shell-like dental instrument of claim 3, wherein, The length of the guide block along the mesial-distal direction of the patient's dentition covers at least 1 / 2 of the total length of all teeth in the posterior teeth region in the mesial-distal direction.

6. The shell-like dental instrument of any one of claims 2-5, wherein, When the surface of the auxiliary occlusal part facing the opposite jaw at least partially contacts the surface of the corresponding occlusal position of the first shell body, the surface of the auxiliary occlusal part facing the opposite jaw is a smooth plane.

7. The shell-like dental instrument of any one of claims 2-5, wherein, The width of the surface of the occlusal stabilizing part facing the opposite jaw in the buccal-lingual direction is less than or equal to the width of the teeth in the corresponding position of the second shell body of the opposite jaw in the buccal-lingual direction.

8. The shell-like dental instrument of claim 7, wherein: The width of the surface of the occlusal stabilizing part facing the opposite jaw in the buccal-lingual direction is at least greater than 0.6 times the width of the teeth in the corresponding position of the second shell body of the opposite jaw in the buccal-lingual direction.

9. The shell-like dental instrument of any one of claims 2-5, wherein, When the auxiliary occlusal part at least partially contacts the surface of the corresponding occlusal position of the first shell body, the length of the guide block along the mesial-distal direction of the patient's dentition covers at least the length of the mesial-distal direction of the first premolar of the second shell body.

10. The shell-like dental instrument of any one of claims 2-5, wherein, The predetermined height gap is less than 1 / 5 of the distance between the occlusal surface of the tooth at the position of the guide block and the corresponding occlusal surface of the first shell body.

11. The shell-like dental instrument of any one of claims 2-5, wherein, The guide block is provided with a reinforcing structure for increasing the strength of the guide block.

12. The shell-like dental instrument of claim 11, wherein: The reinforcing structure comprises a reinforcing support part formed by inwardly recessing or outwardly protruding the buccal surface and / or the lingual surface of the guide block, the reinforcing support part penetrating through the upper and lower support contour edges of the guide block, so that when the shell dental appliance is worn, the upper and lower support contour edges of the guide block are respectively supported by the corresponding occlusal surfaces to generate auxiliary support force resisting deformation of the guide block in the occlusal direction.

13. The shell-like dental instrument of claim 11, wherein: The reinforcing structure comprises a reinforcing rib provided on the buccal surface and / or the lingual surface of the guide block.

14. The shell-like dental instrument of claim 11, wherein: The guide block is a hollow structure, and the reinforcing structure is a filling block embedded in the guide block.

15. The shell-like dental instrument of any one of claims 2-5, wherein, The guide block is formed separately from the first shell body and has greater rigidity or hardness than the first shell body, and the guide block is fixedly installed on the occlusal surface of the posterior region of the first shell body.

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