Dental correction system and design method thereof

Abstract

The invention discloses a dental correction system, which comprises a first dental instrument, a second dental instrument, a third dental instrument, a fourth dental instrument, a fifth dental instrument and a sixth dental instrument, each first shell-shaped tooth appliance comprises a first shell for accommodating and positioning teeth and a jaw repositioning element extending from the buccal side or the tongue side or the occlusal surface; a second dental instrument comprising k2 second shell-shaped dental appliances designed to progressively move the teeth of the patient from the stage target tooth layout of the jaw reconstruction stage of the first dental instrument to the target tooth layout to implement a dental correction plan; the third dental instrument comprises k3 third shell-shaped tooth correctors used for gradually adjusting the teeth of the patient from the actual tooth layout at the end of the first dental instrument to the stage target tooth layout, the correction period of tooth correction with the jaw position relation needing to be adjusted can be shortened, and the invention further discloses a corresponding design method.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of dental orthodontics, and in particular to a dental correction system and a design method thereof. Background Art

[0002] Malocclusion refers to the deformities of teeth, jaws, and craniofacial structures caused by congenital genetic factors or acquired environmental factors during the growth and development of children. Such as uneven teeth, protruding upper teeth, tilted chin, crooked mouth, etc. With the continuous deepening of clinical research, the concept of malocclusion in modern times is no longer just the misalignment and misalignment of teeth, but refers to a variety of deformities caused by the imbalance between teeth and craniofacial structures. The harm of malocclusion is mainly reflected in the four aspects of function, beauty, health and psychology, which affects the normal function of children's oral functions, such as chewing function, pronunciation function, and breathing function.

[0003] Shell-shaped dental braces are a device for treating malocclusion. They are made of safe, elastic, transparent polymer materials, which allow the correction process to be completed almost without anyone noticing. Orthodontic treatment using shell-shaped dental braces generally requires multiple successive shell-shaped dental braces. In some cases, for malocclusions involving jaw position factors, jaw reconstruction is generally required at one or some stages of orthodontic treatment to correct the jaw position and restore the mandible that has deviated from the normal position to its normal position.

[0004] At present, for malocclusion with jaw position factors, the correction plan usually includes a jaw reconstruction stage with jaw correction as the main goal and an occlusion fine-tuning stage with fine-tuning as the main goal after the jaw position adjustment is completed. Among them, the jaw reconstruction stage mainly designs the jaw realignment element according to the initial jaw position and the target jaw position of the patient's teeth and jaws. The correction steps of jaw reconstruction can be determined by the doctor based on personal experience, and the patient's teeth and jaws are gradually adjusted from the initial jaw position to the target jaw position using the jaw realignment element; the occlusion fine-tuning stage is a further fine adjustment of the tooth arrangement after the jaw position adjustment is completed. It is designed based on the actual tooth layout after the jaw reconstruction stage and the patient's ideal target tooth layout. By designing a number of correction steps, the actual tooth layout after the jaw reconstruction stage is gradually moved toward the patient's target tooth layout.

[0005] However, the current orthodontic treatment scheme has the following disadvantages: 1. The actual tooth layout after the jaw adjustment is different from the patient's target tooth layout. The orthodontic treatment plan for the bite fine-tuning stage is often still thirty to forty steps or even more. Therefore, after the jaw adjustment is completed, the patient often needs to wait for a long time before the bite fine-tuning stage can be carried out, which prolongs the patient's overall treatment cycle; 2. In order to speed up the treatment process, the tooth alignment target is often considered in each treatment step of jaw reconstruction, that is, the expected tooth correction target is also set for the jaw reconstruction stage, and each appliance in the jaw reconstruction stage is also designed to gradually move the teeth from the initial position to the expected tooth correction target. However, the tooth layout achieved at the end of the jaw reconstruction stage is not stable. Due to the existence of muscle memory, if the waiting time for the appliance in the bite fine-tuning stage is too long, the tooth layout may regress, which will cause the subsequent designed appliance in the bite fine-tuning stage to be improperly worn, causing patient discomfort and the resulting correction errors. Summary of the invention

[0006] The main purpose of the present invention is to propose a dental correction system and a design method thereof, aiming to reduce the waiting time after the jaw reconstruction stage, and to avoid discomfort in wearing the correction device and correction errors in the occlusal fine-tuning stage caused by changes in the tooth layout due to too long waiting time.

[0007] To achieve the above objectives, the present application provides a dental correction system, including:

[0008] A first dental appliance, comprising k1 first shell-shaped dental appliances for gradually adjusting a patient's jaw from an initial jaw position to a target jaw position, each first shell-shaped dental appliance comprising a first shell for accommodating and positioning teeth and a jaw repositioning element extending from a buccal or lingual or occlusal surface of the first shell to gradually reposition the patient's misaligned jaw, wherein k1>=1;

[0009] A second dental appliance, comprising k2 second shell-shaped dental appliances, wherein the second shell-shaped dental appliances are designed to implement a dental treatment plan by gradually moving the patient's teeth from the stage target tooth layout of the first dental appliance to the target tooth layout of the second dental appliance, and the second shell-shaped dental appliance comprises a second shell for accommodating and positioning the teeth, wherein k2>=1;

[0010] A third dental appliance comprises k3 third shell-shaped dental appliances for gradually adjusting the patient's teeth from the actual tooth layout at the end of wearing the first dental appliance toward the stage target tooth layout of the first dental appliance, wherein the third shell-shaped dental appliance comprises a third shell for accommodating and positioning the teeth, wherein k3>=1.

[0011] Optionally, the elasticity of each third shell in the third dental instrument is the same.

[0012] Optionally, the elasticity of each of the third shells in the third dental instrument gradually decreases with the wearing sequence.

[0013] Optionally, the elasticity of the third shell with the smallest elasticity in the third dental appliance is the same as the elasticity of the second shell that is the frontmost in the wearing order in the second dental appliance.

[0014] Optionally, the elasticity of the third shell is greater than the elasticity of the first shell.

[0015] Optionally, the diaphragm thickness of the third shell is the same as that of the first shell, and the elastic modulus of the diaphragm of the third shell is smaller than the elastic modulus of the diaphragm of the first shell.

[0016] Optionally, the elastic modulus of the diaphragm of the third shell is the same as that of the first shell, and the thickness of the diaphragm of the third shell is smaller than the thickness of the diaphragm of the first shell.

[0017] Optionally, the elastic modulus of the third shell diaphragm is smaller than the elastic modulus of the first shell diaphragm, and the thickness of the diaphragm of the third shell is smaller than the thickness of the diaphragm of the first shell.

[0018] Optionally, the elastic modulus of the third shell diaphragm is smaller than the elastic modulus of the first shell diaphragm, and the diaphragm thickness of the third shell is greater than the diaphragm thickness of the first shell, or the thickness of the third shell diaphragm is smaller than the thickness of the first shell diaphragm, and the elastic modulus of the third shell diaphragm is greater than the elastic modulus of the first shell diaphragm.

[0019] Optionally, the elasticity of the third shell is greater than or equal to the elasticity of the second shell.

[0020] Optionally, the elasticity of the second shell in the second dental instrument is greater than or equal to the elasticity of the first shell.

[0021] Optionally, the value of k3 is less than or equal to 10.

[0022] Optionally, the first shells in the first dental apparatus have the same geometric shape, and the first shells with the same geometric shape are designed not to apply correction force to the dentition of the patient's jaw wearing the apparatus.

[0023] Optionally, the geometric shapes of the first shell bodies in the first dental appliance are different, and the first shell bodies are designed to gradually move the patient's teeth from an initial tooth layout to a target tooth layout in the jaw reconstruction stage to implement a dental correction plan.

[0024] To achieve the above object, the present invention also provides a method for designing a dental correction system, comprising:

[0025] Acquire an initial jaw digital model and target tooth state information, wherein the target tooth state information includes a target jaw position, a target tooth layout in a jaw position reconstruction stage, and a target tooth layout in an occlusal fine-tuning stage;

[0026] Designing a jaw repositioning element model according to the initial jaw digital model and the target jaw position, specifically including designing the size, shape and preset position of the jaw repositioning element;

[0027] Based on the initial dental and jaw digital model, the jaw repositioning element model and the stage tooth layout in the jaw reconstruction stage, a first dental and jaw digital model with the jaw repositioning element is generated;

[0028] designing a first dental appliance based on the first dental-jaw digital model, so that the first dental appliance has k1 first shell-shaped dental appliances for gradually adjusting the patient's jaw from the initial jaw position toward the target jaw position;

[0029] Generate a digital model of the second jaw based on the target tooth layout in the jaw reconstruction phase and the target tooth layout in the occlusal fine-tuning phase;

[0030] Designing a second dental appliance based on the first dental jaw digital model so that the second dental appliance has k2 second shell-shaped dental appliances for gradually moving the patient's teeth from the stage target tooth layout of the first dental appliance to the target tooth layout of the patient's occlusal fine-tuning stage;

[0031] Obtaining a digital model of the intermediate jaw that represents the patient's actual dental layout at the end of the jaw reconstruction phase;

[0032] Generate a third digital model of the dental jaw based on the intermediate digital model of the dental jaw and the stage target tooth layout of the jaw position reconstruction stage;

[0033] A third dental appliance is designed based on the third dental jaw digital model so that the third dental appliance has k3 third shell-shaped dental appliances for gradually adjusting the patient's teeth from the actual tooth layout toward the stage target tooth layout of the jaw position reconstruction stage.

[0034] Optionally, before the step of generating a third digital model of the teeth and jaws based on the intermediate digital model of the teeth and jaws and the stage target tooth layout of the jaw position reconstruction stage, the step further includes:

[0035] Acquire the actual tooth layout of the patient after wearing the first dental appliance according to the intermediate dental jaw digital model;

[0036] Calculating the offset between the actual tooth layout and the stage target tooth layout;

[0037] When the offset exceeds a preset threshold, the third dental jaw digital model is generated according to the intermediate dental jaw digital model and the stage target tooth layout.

[0038] Optionally, the calculating the offset between the actual tooth layout and the stage target tooth layout includes:

[0039] Acquire actual tooth coordinate information and stage target tooth coordinate information of each tooth in the patient's dentition, wherein both the actual tooth coordinate information and the stage target tooth coordinate information include tooth position coordinate information and angle coordinate information;

[0040] The offset is calculated based on the actual tooth coordinate information and the stage target tooth coordinate information, and the offset includes sub-offsets corresponding to the X-axis, Y-axis, and Z-axis and an angle sub-offset.

[0041] Optionally, when the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout includes:

[0042] Determine for each tooth or each key tooth in turn whether each sub-offset of the current tooth exceeds a corresponding set threshold;

[0043] When a sub-offset exceeds the corresponding set threshold, it is determined that the current tooth needs to be fine-tuned;

[0044] The third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout.

[0045] Optionally, when the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout includes:

[0046] determining a critical sub-offset among each sub-offset of each tooth;

[0047] Determine for each tooth or each key tooth in turn whether each key sub-offset of the current tooth exceeds a corresponding set threshold;

[0048] When a certain critical sub-offset exceeds the corresponding set threshold, it is determined that the current tooth needs to be fine-tuned;

[0049] Based on the intermediate jaw digital model and the stage target tooth layout, the third jaw digital model is generated

[0050] Optionally, when the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout includes:

[0051] For each tooth or each key tooth, normalizing each sub-offset of the current tooth in turn to obtain each normalized sub-offset;

[0052] Perform weighted summation on the normalized sub-offsets;

[0053] Based on the comparison between the weighted sum result and the comprehensive threshold, if it is greater than the comprehensive threshold, it is determined that the current tooth needs to be fine-tuned;

[0054] The third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout.

[0055] Optionally, when the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout further includes:

[0056] For each tooth, determining the tooth that needs to be fine-tuned based on the offset of the tooth and a preset threshold;

[0057] Count the number of teeth that need fine-tuning;

[0058] Whether the third dental jaw digital model needs to be generated is determined based on the ratio of the number of teeth that need to be fine-tuned to the number of teeth in the current dentition.

[0059] Compared with the prior art, the dental correction system and design method of the present invention have the following beneficial effects:

[0060] 1. The present invention designs a first dental appliance for the jaw reconstruction stage and a second dental appliance for the occlusal fine adjustment stage which is designed based on the stage target tooth layout and the target tooth layout of the jaw reconstruction stage at the end of the first dental appliance, and obtains a third dental appliance based on the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage at the end of the jaw reconstruction stage. Since the third dental appliance is only designed to solve the possible slight difference between the stage target tooth layout and the actual tooth layout of the jaw reconstruction stage, the correction step corresponding to the third dental appliance can be limited to the set number of correction steps, reducing the patient's waiting time, thereby avoiding the problem of improper wearing of the appliance in the subsequent designed occlusal fine adjustment stage due to the change of tooth layout caused by the long waiting time and the correction error caused thereby;

[0061] 2. The present invention designs the elasticity of each third shell of the third dental appliance to gradually decrease to be approximately the same as the elasticity of the second shell that is worn first in the second dental appliance, so that when the patient starts to wear the second dental appliance, there will be no discomfort caused by excessive difference in correction force due to excessive difference in elasticity.

[0062] 3. The present invention calculates the offset between the actual tooth layout at the end of the jaw reconstruction stage and the stage target tooth layout of the jaw reconstruction stage before designing the third dental appliance. When the offset does not exceed the preset threshold, the third dental appliance does not need to be designed and the occlusal fine-tuning stage can be directly entered, thereby further reducing the patient's waiting time and shortening the correction cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplary descriptions do not constitute limitations on the embodiments.

[0064] Figure 1 is a system structure diagram of a dental correction system according to an embodiment of the present application;

[0065] Figure 2 is a structural diagram of a first dental apparatus according to an embodiment of the present application;

[0066] Figure 3 is a structural diagram of a first dental apparatus according to another embodiment of the present application;

[0067] Figure 4 is a structural diagram of a first dental apparatus according to yet another embodiment of the present application;

[0068] Figure 5 is a structural diagram of a first dental apparatus according to another embodiment of the present application;

[0069] Figure 6 is a structural diagram of a first dental apparatus according to another embodiment of the present application;

[0070] Figure 7 is a structural diagram of a third dental apparatus according to an embodiment of the present application;

[0071] Figure 8 In one embodiment of the present application, Figure 7 A cross-sectional view of a dental orthodontic system taken along line A-A';

[0072] Fig. 9 In another embodiment of the present application, Figure 7 A-A' cross-sectional view of a dental appliance system

[0073] Fig.10 is a structural diagram of a second dental apparatus according to an embodiment of the present application;

[0074] Fig.11 It is a flow chart of a method for designing a dental correction system in another embodiment of the present application. DETAILED DESCRIPTION

[0075] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0076] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0077] The "anterior tooth area" and "posterior tooth area" mentioned in various embodiments of the present application are defined according to the classification of teeth in the second edition of "Introduction to Stomatology" published by Peking University Medical Press, pages 36-38. The posterior tooth area includes premolars and molars, which are displayed as teeth 4-8 by the FDI marking method. The anterior tooth area is displayed as teeth 1-3 by the FDI marking method. The teeth in the anterior tooth area include central incisors, lateral incisors and canines. In addition, for the teeth in the deciduous tooth stage, the "anterior tooth area" and "posterior tooth area" are defined according to the classification of deciduous teeth in the second edition of "Introduction to Stomatology" published by Peking University Medical Press, pages 40-41, including three categories: deciduous incisors, deciduous canines and deciduous molars. The anterior tooth area includes deciduous incisors and deciduous canines, wherein the deciduous incisors include deciduous central teeth and deciduous lateral incisors, and the posterior tooth area includes deciduous molars, wherein the deciduous molars include first deciduous molars and second deciduous molars.

[0078] The "sagittal direction" mentioned in each embodiment of the present application is defined in the "Terminology of Medical Imaging Technology", which specifically refers to the direction in which the center line of the X-ray enters the subject's body from the front or back and is parallel to the sagittal plane.

[0079] From the background technology, it can be seen that for malocclusion caused by jaw position factors, the correction plan usually includes a jaw reconstruction stage with jaw correction as the main goal and an occlusion fine-tuning stage with fine-tuning as the main goal. The dental correction plan in the occlusion fine-tuning stage is designed based on the actual tooth layout and target tooth layout at the end of the jaw reconstruction stage. This correction plan requires patients to wait for a long time after the jaw adjustment before they can undergo correction in the occlusion reconstruction stage, which prolongs the overall treatment cycle of the patients. At the same time, since patients need to wait for a long time, the tooth layout that has just been corrected in the jaw reconstruction stage is not stable and is prone to change. The change in tooth layout caused by the long waiting time will lead to inappropriate wearing of the braces designed in the subsequent occlusion fine-tuning stage, causing discomfort to the patients and the resulting correction errors.

[0080] Based on this, the present invention provides a dental correction system for the correction of malocclusion with jaw position factors, comprising: a first dental appliance, the first dental appliance comprising k1 first shell-shaped dental appliances for gradually adjusting the patient's jaw from an initial jaw position to a target jaw position, each first shell-shaped dental appliance comprising a first shell for accommodating and positioning teeth and a jaw repositioning element extending from the buccal side, lingual side or occlusal surface of the first shell, so as to gradually adjust the patient's jaw from the initial jaw position to the target jaw position, wherein k1>=1; a second dental appliance, comprising k2 second shell-shaped dental appliances, the second shell-shaped dental appliances being designed to gradually move the patient's teeth from the target tooth layout of the jaw position reconstruction stage at the end of the designed first dental appliance to the target tooth layout of the patient to implement a dental correction plan, the second shell-shaped dental appliance comprising a second shell for accommodating and positioning teeth, wherein k2>=1; a third dental appliance, comprising a second shell for accommodating and positioning teeth, wherein k2>=1; The actual tooth layout is gradually adjusted toward the stage target tooth layout of the jaw reconstruction stage at the end of the designed first dental instrument, and k3 third shell-shaped dental appliances are used. The third shell-shaped dental appliance includes a third shell for accommodating and positioning teeth, wherein k3>=1. The present invention designs the correction plans of the jaw reconstruction stage and the occlusion fine-tuning stage at the same time, and designs the correction plan of the occlusion fine-tuning stage based on the stage target tooth layout of the jaw reconstruction stage at the end and the patient's final target tooth layout. Then, at the end of the jaw reconstruction stage, only the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage need to be used to design the third dental appliance to resolve the possible slight differences between the stage target tooth layout of the jaw reconstruction stage and the actual tooth layout. The correction step corresponding to the third dental appliance can be limited to the set number of correction steps, thereby reducing the patient's waiting time and avoiding the problem of improper wearing of the appliance of the occlusion fine-tuning stage designed subsequently due to changes in tooth layout caused by long waiting time and the correction error caused thereby.

[0081] The implementation details of the dental correction system described in this application will be specifically described below in conjunction with specific embodiments. The following content is only the implementation details provided for ease of understanding and is not necessary for implementing this solution.

[0082] like Figure 1 As shown, an embodiment of the present application provides a dental correction system, which is applied to the correction of malocclusion caused by jaw position factors, and includes:

[0083] A first dental device 100, the first dental device 100 includes k1 first shell-shaped dental appliances 100-1, the k1 first shell-shaped dental appliances 100-1 are used to gradually adjust the patient's jaw from an initial jaw position to a target jaw position, the initial jaw position refers to the position of the jaw after the jaw is naturally closed in an initial state before correction, the target jaw position refers to the position of the jaw designed for correction, compared with the initial jaw position, at the target jaw position, at least a part of the patient's upper and lower dental arches become closer. Each first shell-shaped dental appliance 100-1 includes a first shell for accommodating and positioning teeth and a jaw repositioning element 100-2, the first shell is a shell made of polymer material, and a cavity is formed inside the shell for accommodating the patient's teeth, the jaw repositioning element extends from the buccal side or the lingual side or the occlusal surface of the first shell to gradually reposition the patient's misaligned jaw when worn, thereby moving the patient's jaw from the initial jaw position to the target jaw position. In various embodiments of the present invention, each first shell-shaped dental appliance 100-1 including a jaw repositioning element is configured to apply a jaw moving force to the patient's teeth and jaws, so that when k1 first shell-shaped dental appliances are worn continuously, the patient's jaw can be gradually moved from an initial jaw position to a target jaw position through an increasing sequence of steps. Since the main purpose of the first dental device 100 is to reposition the patient's misaligned jaw, the wearing stage of the first dental device including a series of first shell-shaped dental appliances can be called a jaw reconstruction stage. In this embodiment, the number k1 of first shell-shaped dental appliances used in the jaw reconstruction stage is not constant. For example, the jaw reconstruction process of some cases may only require 20 correction steps, while for some complex cases, 40 or even more correction steps may be required. Of course, there may be one or more first shell-shaped dental appliances corresponding to each correction step.

[0084] In some embodiments, in order to focus on the adjustment of the jaw relationship during the jaw reconstruction phase and thus improve the efficiency of the jaw reconstruction, the first shell of each first shell-shaped dental appliance 100-1 can be configured not to apply a dental correction force to the patient's dentition. For example, the geometry of the cavity of each first shell in the first dental device 100 matches the geometry of the patient's initial tooth layout, and the first shell does not apply a tooth movement force to the patient's teeth. In this case, the geometry of the cavity of each first shell in the first dental device 100 matches the geometry of the initial tooth layout. Of course, in other embodiments, in order to speed up the correction process, the first shell of the first shell-shaped dental appliance 100-1 can also be designed to move the jaw. It is also configured to apply tooth moving force to the patient's dentition to align the teeth while the jaw is being reconstructed, thereby speeding up the correction process. At this time, each first shell in the first dental device 100 is designed to gradually adjust the patient's teeth from the initial tooth layout to the stage target tooth layout of the jaw reconstruction stage. The stage target tooth layout of the jaw reconstruction stage refers to the tooth layout that is desired to be achieved by aligning the teeth during the jaw reconstruction stage, which can be designed by a physician or designer based on experience. In this case, the geometric shapes of the cavities of each first shell are different, and the difference in the geometric shapes of the cavities is determined by the corresponding different correction steps, and the geometric shapes of the cavities of each first shell correspond to the desired tooth layout of the corresponding correction step.

[0085] The second dental appliance 200 comprises k2 second shell-shaped dental appliances 200-1, wherein the k2 second shell-shaped dental appliances 200-1 are designed to implement a dental correction plan by gradually moving the patient's teeth from a target tooth layout in a jaw reconstruction stage to a target tooth layout in an occlusal fine-tuning stage, wherein the second shell-shaped dental appliance comprises a second shell for accommodating and positioning teeth, wherein k2>=1, and each second shell of the second dental appliance 200 is not provided with a jaw repositioning element, and is mainly used for further aligning the teeth of the dentition after the jaw reconstruction stage, such as Fig.10 As shown, in the present invention, the wearing stage of the second dental appliance including a series of second shell-shaped dental appliances is called the occlusal fine adjustment stage. The number k2 of the second shell-shaped dental appliances in this stage is also not constant. For some cases, only 20 to 40 may be needed, while for complex cases, more may be needed.

[0086] Each second shell in the second dental appliance 200 is a shell made of polymer material, and a cavity is formed inside the shell to receive the patient's teeth, so as to gradually move the patient's teeth from the stage target tooth layout of the jaw reconstruction stage to the target tooth layout of the occlusal fine adjustment stage. As mentioned above, the stage target tooth layout of the jaw reconstruction stage is the tooth layout that is expected to be achieved at the end of the jaw reconstruction stage designed by the physician or designer. When the geometric shape of each first shell in the first dental appliance 100 is consistent with the geometric shape of the initial tooth layout of the patient and no dental correction force is applied to the patient's teeth, the stage target tooth layout of the jaw reconstruction stage is the initial tooth layout; when the geometric shapes of each first shell in the first dental appliance 100 are different, the stage target tooth layout of the reconstruction stage is the stage target tooth layout of the last correction step in the first dental appliance 100 designed by the physician or designer. The target tooth layout of the occlusal fine adjustment stage can be the final target tooth layout of the patient designed by the physician or designer, or it can be an intermediate target tooth layout designed arbitrarily in the middle of the occlusal fine adjustment stage, and the present invention is not limited thereto. In each embodiment of the present invention, the geometric shapes of each second shell in the second dental device 200 are different, and the difference in the geometric shapes is determined by its application in different correction steps. Each second shell successively positions the teeth from the target tooth layout of the jaw reconstruction stage to the target tooth layout of the occlusal fine-tuning stage through a cavity of different geometric shapes.

[0087] The third dental appliance 300 includes k3 third shell-shaped dental appliances 300-1, and the k3 third shell-shaped dental appliances 300-1 are used to gradually adjust the patient's teeth from the actual tooth layout at the end of the jaw reconstruction stage, that is, the actual tooth layout at the end of wearing the last first shell-shaped dental appliance 100-1 in the first dental appliance, to the stage target tooth layout of the jaw reconstruction stage of the jaw reconstruction stage. The third shell-shaped dental appliance 300-1 includes a third shell for accommodating and positioning teeth. In this embodiment, the wearing stage of the third dental appliance including a plurality of third shell-shaped dental appliances is referred to as a fine-tuning stage, such as Figure 7 shown.

[0088] In various embodiments of the present invention, the third shell is a shell made of polymer material, and a cavity is formed inside the shell, and the cavity is used to receive the patient's teeth. The geometric shapes of the third shells in the third dental apparatus 300 are different, and the cavities of different geometric shapes correspond to different correction steps. Through the cavities of different geometric shapes, the teeth are successively positioned from the actual tooth layout at the end of the jaw reconstruction stage to the stage target tooth layout of the jaw reconstruction stage, so as to facilitate the wearing of each second shell-shaped dental appliance in the subsequent second dental apparatus. The number k3 of the third shell-shaped dental appliances used in the third dental apparatus is not constant, and can be determined by the deviation between the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage. Generally, it can be set to three or four correction steps. For some cases with relatively large deviations, seven or eight correction steps can also be set. However, generally speaking, the deviation between the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage will not be too large, and in order to reduce the waiting time of the patient, therefore, the number k3 of the appliances in the fine-tuning stage is generally less than or equal to 10, preferably less than or equal to 5.

[0089] For the first dental device 100, in the correction plan for jaw position adjustment, different jaw position adjustment schemes are generally used for different types of malocclusion, and the specific forms of the jaw repositioning elements are also different. In the embodiments of the present invention, the malocclusion with jaw position factors is mainly divided into three types of malocclusion: the malocclusion type caused by sagittal abnormality of the maxillary and mandibular bones, the malocclusion type caused by vertical abnormality of the maxillary and mandibular bones, and the malocclusion type caused by horizontal abnormality of the maxillary and mandibular bones.

[0090] The types of malocclusion caused by sagittal abnormalities of the maxillary and mandibular bones generally include protrusion and concavity. In some embodiments, for protrusion caused by sagittal abnormalities of the maxillary and mandibular bones, a double jaw plate functional appliance can be used for the correction of jaw position reconstruction. In some preferred embodiments, for example, Figure 2As shown, the first shell of the first shell-shaped dental appliance 100-1 in the first dental instrument 100 includes an upper shell-shaped body for accommodating maxillary teeth and a mandibular shell-shaped body for accommodating mandibular teeth, and its jaw repositioning element includes a first protrusion 211 protruding toward the opposite jaw at the position of the occlusal surface of the posterior teeth area of ​​the shell-shaped body of the upper jaw or the mandibular for adjusting the relative position relationship between the upper and lower jaws, and a second protrusion 212 for adjusting the relative position relationship between the upper and lower jaws at the position of the occlusal surface of the appliance of the opposite jaw, the first protrusion 211 includes a first surface, and the second protrusion 212 includes a second surface to cooperate, interact and / or engage with the first surface of the first protrusion 211, so that the muscles related to the movement of the mandible can be retrained to a new position by moving the mandible; in another In some embodiments, for other protrusive deformities caused by sagittal abnormalities of the maxillary and mandibular bones, a occlusal advancement appliance, such as an HB (Herbst) appliance, can be used to adjust the jaw relationship for jaw reconstruction. In some preferred embodiments, the first shell of the first shell-shaped dental appliance 100-1 in the first dental instrument 100 also includes a maxillary shell-shaped body for accommodating maxillary teeth and a mandibular shell-shaped body for accommodating mandibular teeth, and its jaw repositioning element includes a protruding portion 311 protruding from the buccal side of the posterior tooth area of ​​the maxillary or mandibular shell-shaped body facing the opposite jaw to adjust the maxillary and mandibular position relationship, and the appliance for the opposite jaw is provided with a limiting portion 312 protruding along the buccal side toward the buccal side, and the maxillary and mandibular position relationship is adjusted through the interaction between the mesial surface of the protruding portion 311 and the distal surface of the limiting portion, such as Figure 3 shown.

[0091] For concave deformities caused by sagittal anomalies of the upper and lower jaws, in some embodiments, the jaw relationship adjustment scheme in the jaw reconstruction stage can be to open the occlusion of the upper and lower posterior teeth areas through a jaw repositioning element, and then cooperate with the maxillary external maxillary reverse traction through another jaw repositioning element. For example, the first shell of the first shell-shaped dental orthodontic appliance 100-1 in the first dental instrument 100 includes at least a maxillary shell-shaped body for accommodating the maxillary teeth, and the jaw repositioning element includes a protruding portion 411 protruding from the posterior tooth area of ​​the maxillary shell-shaped body toward the opposite jaw and a traction portion 412 provided on the labial side of the maxillary shell-shaped body. The protruding portion 411 cooperates with the mandibular posterior tooth area to perform occlusion reconstruction, so that the mandibular incisor and the maxillary incisor tend to be aligned. At the same time, the traction portion 412 cooperates with the maxillary external maxillary reverse traction to reshape the jaw. Figure 4 shown.

[0092] For malocclusion caused by vertical abnormalities of the upper and lower jaws, in some embodiments, the first shell of the first shell-shaped dental appliance 100-1 in the first dental instrument 100 includes at least a maxillary shell-shaped body for accommodating maxillary teeth, and its jaw repositioning element may include a guide plate 510 provided at the gingival margin on the lingual side of the anterior tooth area of ​​the maxillary shell-shaped body or adjacent to the gingival margin, so that when biting, the guide plate 510 contacts the anterior tooth area of ​​the mandible and guides the mandible to move to open the posterior teeth for biting, such as Figure 5 shown.

[0093] For malocclusion caused by horizontal abnormalities of the maxillary and mandibular bones, in some embodiments, the first shell of the first shell-shaped dental appliance 100-1 in the first dental device 100 includes at least a maxillary shell-shaped body and / or a mandibular shell-shaped body for accommodating maxillary teeth and / or mandibular teeth, and its jaw repositioning element includes a protrusion 610 protruding toward the opposite jaw at the position of the posterior teeth area on both sides of the maxillary shell-shaped body or the mandibular shell-shaped body, which is used to open the bite and perform bite reconstruction, such as Figure 6 shown.

[0094] Of course, even for patients with the same type of malocclusion, the jaw relationship adjustment plan is not unique. For example, for jaw concave deformity, especially when the target amount of sagittal adjustment is small, only a protrusion is provided from the posterior tooth area of ​​the maxillary shell-like body toward the opposite jaw, and a sagittal adjustment part is provided on the protrusion. Alternatively, a protrusion is provided from the posterior tooth area of ​​the maxillary shell-like body toward the opposite jaw, and a traction part is provided on the labial side of the maxillary shell-like body. Since the focus of the present invention is not on how to perform jaw reconstruction itself, it will not be elaborated here.

[0095] In each embodiment of the present invention, the jaw repositioning element of each first shell-shaped dental appliance in the first dental device 100 can be formed integrally with the first shell, and the jaw repositioning element can also be connected to the buccal side, lingual side or occlusal surface of the first shell by a fixed connection or a detachable connection, and be formed to extend from the buccal side, lingual side or occlusal surface of the first shell. In this embodiment, on the one hand, in order to provide a greater jaw moving force to the patient's teeth and jaws, the stiffness of the jaw repositioning element is generally greater than the stiffness of the first shell, and the difference in stiffness may be caused by at least one difference in thickness, hardness, material, and number of layers between the jaw repositioning element and the first shell. Of course, the first shell may also have a greater stiffness. In this case, the stiffness of the jaw repositioning element may also be the same as the stiffness of the first shell, but generally speaking, the stiffness of the jaw repositioning element should not be less than the stiffness of the first shell, so as to ensure that sufficient jaw moving force is provided to the teeth and jaws; on the other hand, relative to the movement of the teeth, the jaw movement of the repositioned jaw often requires greater force, and therefore, the elasticity of the first shell in the first dental device 100 is relatively small, and the relatively small means that the elasticity of the first shell is smaller than the elasticity of the second shell in the second dental device 200, and smaller than the elasticity of the third shell in the third dental device 300, so as to ensure the efficiency of jaw reconstruction. It should be noted that the elasticity of each first shell in the first dental instrument 100 may be the same or different, that is, when the elasticity of each first shell is different, the elasticity of the shell with the greatest elasticity among the first shells should not only be smaller than the elasticity of each second shell, but also smaller than the elasticity of each third shell.

[0096] Since the dental model used to prepare the shell is not a regular structure, the elasticity of each part of the prepared third shell may not be the same, but it is generally believed that under the same preparation process, when the elasticity of the diaphragm used to prepare the shell is greater, the elasticity of the prepared shell will also be greater. Therefore, in each embodiment of the present invention, the elasticity of the shell refers to the elasticity of the diaphragm used to prepare the shell.

[0097] In some embodiments, considering that after the jaw movement after the jaw reconstruction, the patient needs to adapt to the repositioned jaw, in order to alleviate the patient's discomfort, it is not appropriate to wear an appliance that produces too much tooth correction force at this time. In order to facilitate the patient to adapt to the new jaw position of the jaw movement as soon as possible, the elasticity of each of the third shells in the third dental appliance 300 gradually decreases with the wearing order. In this embodiment, by providing the patient with a third shell with large elasticity at the beginning of the end of the jaw reconstruction, the greater the elasticity, the smaller the correction force on the teeth, and the stronger the patient's comfort, the patient's discomfort with the new jaw position can be alleviated. After the patient gradually adapts to the new jaw position, the elasticity of the third shell is gradually reduced as the correction plan progresses, thereby gradually increasing the correction force on the teeth and improving the correction efficiency. In general, the elasticity of the diaphragm used to prepare the shell is related to many factors, such as the thickness of the diaphragm and the elastic modulus of the diaphragm material. Specifically, by designing the thickness of the diaphragm and / or the diaphragm material, the elasticity of each of the third shells in the third dental appliance 300 can be gradually reduced with the wearing order.

[0098] In some preferred embodiments, the elasticity of each third shell in the third dental device 300 gradually decreases with the wearing order, and the elasticity of the third shell at the end of the wearing order is still greater than the elasticity of the first shell in the first dental device 300 (when the elasticities of the first shells are different, the elasticity of the third shell at the end of the wearing order needs to be at least greater than the elasticity of the first shell with the largest elasticity in the first dental device 100), so as to ensure that the elasticity of each third shell in the third dental device 300 is greater than the elasticity of each first shell in the first dental device 100, thereby improving the comfort of wearing the orthodontic appliance after the jaw reconstruction stage is completed.

[0099] In other preferred embodiments, in order to enable the patient to adapt to wearing the second dental appliance as soon as possible after the third dental appliance stage, when the elasticity of each third shell in the third dental appliance 300 gradually decreases with the wearing order, the elasticity of the last third shell in the wearing order is the same as the elasticity of the first second shell in the second dental appliance 200, so that the patient will not feel uncomfortable due to the large elasticity difference between the third shell and the second shell when the second dental appliance 200 is connected with the third dental appliance 300. For example, if the elasticity of the first second shell in the wearing order is too small compared with the elasticity of the last third shell in the wearing order, , the patient will suddenly feel excessive orthodontic force and feel uncomfortable. The substantially same may be the same elasticity of the diaphragm, for example, the thickness and material of the diaphragm are the same. It should be noted that the same includes substantially the same, which means that the elasticity of the two may have some slight differences. In some embodiments, the substantially same means that when the diaphragm materials are the same, the thickness difference of the diaphragm is within the set threshold, for example, the set threshold of the thickness difference is 0.1mm; and in other embodiments, the substantially same means that when the diaphragm thickness is the same, the ratio of the elastic modulus of the diaphragm material is within the set threshold range, for example, the ratio of the elastic modulus is between 0.9 and 1.

[0100] In other embodiments, the elasticity of each third shell in the third dental device 300 may also be the same and greater than the elasticity of the first shell in the first dental device (when the elasticity of each first shell is different, it is at least greater than the elasticity of the first shell with the largest elasticity in the first dental device 300). The third shells with the same elasticity can prevent the patient from feeling the discomfort caused by the difference in shell elasticity, and by ensuring that the elasticity of the third shell in the third dental device 300 is greater than the elasticity of each first shell in the first dental device 100, the comfort of wearing the orthodontic appliance after the jaw reconstruction stage is completed is improved.

[0101] In the case of the same diaphragm thickness, the greater the elastic modulus of the diaphragm material, the smaller the elasticity of the diaphragm, and the smaller the elasticity of the prepared shell-shaped appliance. Therefore, in order to make the diaphragm elasticity of the third shell greater than the diaphragm elasticity of the first shell, in some preferred embodiments, the diaphragm thickness of the third shell is the same as the diaphragm thickness of the first shell, and the elastic modulus of the diaphragm material of the third shell is smaller than the elastic modulus of the diaphragm material of the first shell. In this embodiment, the polymer material used to prepare each shell can be one or a combination of materials such as PETG (polyester), PC (polycarbonate), TPU (polyurethane), or one or more of amorphous thermoplastic polymers, semi-crystalline thermoplastic polymers and transparent thermoplastic polymers. The above thermoplastic polymers are selected from polycarbonate, thermoplastic polyurethane, acrylic acid, polysulfone, polypropylene, polypropylene / ethylene copolymer, cycloolefin polymer / Copolymers, poly-4-methyl-1-pentene or polyester / polycarbonate copolymers, styrene-based polymer materials, polyamide, polymethylpentene, polyetheretherketone and combinations thereof; in other preferred embodiments, for the same material, the thickness of the diaphragm will also affect its elasticity. When the diaphragm material is the same, the greater the thickness of the diaphragm, the smaller the elasticity of the diaphragm, and the smaller the elasticity of the prepared shell-shaped appliance. Therefore, in order to make the diaphragm elasticity of the third shell greater than the diaphragm elasticity of the first shell, the diaphragm of the third shell can be made of the same material as the diaphragm of the first shell, and the diaphragm thickness of the second shell is less than the diaphragm thickness of the first shell, so that the elasticity of the prepared third shell is greater than the elasticity of the first shell. Of course, when the elastic modulus of the third shell diaphragm is smaller than the elastic modulus of the first shell diaphragm, the diaphragm thickness of the third shell may also be greater than the diaphragm thickness of the first shell; or, when the thickness of the third shell diaphragm is smaller than the thickness of the first shell diaphragm, the elastic modulus of the third shell diaphragm may also be greater than the elastic modulus of the first shell diaphragm, as long as the elasticity of the third shell diaphragm is greater than the elasticity of the first shell.

[0102] Since the design of the third shell of the third dental device after the jaw reconstruction is to improve the comfort of the patient after the jaw reconstruction, a diaphragm with greater elasticity is used. A diaphragm with greater elasticity means that its correction force on the teeth is weak. Therefore, if a diaphragm with greater elasticity is always used for tooth correction, the correction period will inevitably be extended, which is also what many patients are unwilling to accept. Therefore, in each embodiment of the present invention, the elasticity of the second shell of the second dental device 200 should be less than or equal to the elasticity of the third shell. In the case where the elasticity of each third shell of the third dental device gradually decreases with the wearing order, the elasticity of the second shell is at least less than or equal to the elasticity of the last third shell in the wearing order.

[0103] In some embodiments, the elasticity of each second shell in the second dental device 200 may be the same, that is, the elasticity of each second shell is both smaller than the elasticity of the third shell and larger than the elasticity of the first shell in the first dental device 100 (when the elasticity of each first shell is different, the elasticity of the second shell needs to be at least larger than the elasticity of the first shell with the largest elasticity in the first dental device 100), and the continuous appropriate elasticity can ensure the patient's correction efficiency; in other embodiments, the elasticity of each second shell in the second dental device 200 may also be gradually reduced according to the wearing order, so that the correction force applied by the second shell in the occlusal fine-tuning stage is a gradually increasing process, and the patient can better adapt to the gradually increasing correction force, but in this case, the elasticity of the second shell with the smallest elasticity (i.e., the last one in the wearing order) is still at least greater than or equal to the elasticity of the first shell.

[0104] In other embodiments, the elasticity of each second shell in the second dental device 200 may also gradually increase according to the wearing order. The smaller elasticity of the second shell at the front of the wearing order means that a larger tooth correction force is provided, which can accelerate the movement of teeth and improve the correction efficiency. In this embodiment, since the elasticity of the second shell in the second dental device gradually increases, when the elasticity of the third shell in the third dental device gradually decreases, the elasticity of the second shell is not necessarily smaller than that of the third shell, but the elasticity of the second shell with the smallest elasticity (i.e., the first one in the wearing order) is still at least greater than or equal to the elasticity of the first shell.

[0105] In some embodiments, the diaphragm of the third shell in the third dental apparatus 300 may be a single-layer diaphragm. Generally speaking, a single-layer diaphragm is more comfortable to wear due to its small thickness. In this embodiment, the thickness of the diaphragm of the third shell is 0.2 mm to 1 mm.

[0106] In other embodiments, in order to reduce the discomfort of the patient, the diaphragm of the third shell in the third dental apparatus 300 may also be a double-layered diaphragm. In some preferred embodiments, the third shell includes a first layer 300a and a second layer 300b. Figure 8 As shown, the second layer 300b is attached to the tooth surface, and the second layer 300b is a softer film than the first layer 300a. In this embodiment, the softer second layer contacts the teeth to increase the wearing comfort. In this embodiment, the thickness of the double-layer film is 0.5-1.5 mm.

[0107] In some other embodiments, the diaphragm of the third shell in the third dental device 300 may also be a multi-layered diaphragm, wherein the innermost layer and the outermost layer of the multi-layered diaphragm are softer than the middle layers, wherein the innermost layer is a layer in contact with the tooth surface, and the softer innermost layer can increase the wearing comfort, and the outermost layer is a layer exposed to the oral cavity, and the softer outer layer can avoid causing damage to the patient's oral cavity. This embodiment takes a three-layer diaphragm as an example. Fig. 9 As shown, the third shell includes an innermost layer 300a', a middle layer 300b' and an outermost layer 300c', wherein the innermost layer 300a' and the outermost layer 300c' use a softer membrane than the middle layer 300b', which can further improve the comfort of wearing the appliance. In this embodiment, the thickness of the three-layer membrane is 0.7-2.0 mm.

[0108] Although the above embodiments take the third shell as an example to illustrate that the third shell can be made of a single-layer diaphragm, a double-layer diaphragm, or a multi-layer diaphragm, it can be understood that at least part of the first shell in the first dental instrument and the second shell in the second dental instrument can also be a single-layer diaphragm, a double-layer diaphragm, or a multi-layer diaphragm, and the present invention is not limited to this.

[0109] like Fig.11 As shown, another embodiment of the present invention further provides a method for designing a dental correction system, comprising:

[0110] Step S1, obtaining an initial jaw digital model and target tooth state information, wherein the target tooth state information includes a target jaw position, a target tooth layout in a jaw position reconstruction stage, and a target tooth layout in an occlusal fine-tuning stage;

[0111] The initial jaw digital model can be obtained through initial jaw information, wherein the initial jaw information can be obtained through intraoral scanning, or by scanning the user's jaw model. In this embodiment, the initial jaw information includes initial tooth information and initial jaw position information. The initial tooth information can specifically include: tooth shape, gum position, etc., and root information obtained from CBCT data (Conebeam CT, also known as cone beam CT). The tooth shape further includes the morphology of the tooth labial surface, lingual surface, occlusal surface, etc., and further includes the tooth cusp, ridge, pit, groove, etc.

[0112] The target tooth state information includes the target jaw position, the target tooth layout in the jaw reconstruction stage, and the target tooth layout in the occlusal fine-tuning stage, which can be given by doctors or designers based on experience, or can be obtained based on the ideal dental arch curve design. The target tooth state information can be obtained using methods in the prior art, which is not the focus of the present invention and will not be described in detail here. However, it should be noted that the target tooth layout in the occlusal fine-tuning stage can be either the final target tooth layout or the target tooth layout in the intermediate process of the occlusal fine-tuning stage, and the present invention does not limit this.

[0113] Step S2, designing a jaw repositioning element model according to the initial jaw digital model and the target jaw position, corresponding to the buccal, lingual or occlusal surface of the initial jaw digital model, specifically including designing the jaw repositioning element feature information.

[0114] With reference to the foregoing embodiments, it can be known that for different types of malocclusion, there are generally different jaw relationship adjustment schemes, and the specific forms of the jaw realignment elements are also different. Therefore, in this embodiment, it is necessary to determine the corresponding jaw relationship adjustment schemes according to different types of malocclusion, and design the characteristic information of the realignment element. The characteristic information of the jaw realignment element includes the shape, size and preset position of the jaw realignment element. The preset position includes at least the position and orientation of the jaw realignment element in each correction step.

[0115] Step S3, generating a first dental and jaw digital model with the jaw repositioning element based on the initial dental and jaw digital model, the jaw repositioning element model and the stage target tooth layout of the jaw reconstruction stage;

[0116] In this embodiment, when it is not desired that the orthodontic appliances in the jaw reconstruction stage apply corrective force to the patient's dentition, the stage target tooth layout of the jaw reconstruction stage is the initial tooth layout, which is determined by the initial tooth information. When it is desired that the tooth alignment design be performed in the jaw reconstruction stage, it is necessary to obtain the stage target tooth layout of the jaw reconstruction stage, and design a first jaw digital model based on the initial tooth layout and the stage target tooth layout of the jaw reconstruction stage. The first jaw digital model actually includes a series of jaw digital models that gradually change from the initial tooth layout to the stage target tooth layout of the jaw reconstruction stage, and according to the characteristic information of the jaw repositioning element, each jaw digital model has a digital model of the jaw repositioning element.

[0117] Step S4, designing a first dental appliance based on the first tooth-jaw digital model, so that the first dental appliance has k1 first shell-shaped dental appliances for gradually adjusting the patient's jaw from an initial jaw position to a target jaw position.

[0118] Step S5, generating a second dental jaw digital model based on the target tooth layout in the jaw position reconstruction phase and the target tooth layout in the occlusal fine-tuning phase;

[0119] In this embodiment, the second jaw digital model obtained based on the stage target tooth layout of the jaw reconstruction stage and the target tooth layout of the occlusal fine-tuning stage actually includes a series of jaw digital models that gradually change from the stage target tooth layout of the jaw reconstruction stage to the target tooth layout.

[0120] Step S6, designing a second dental appliance based on the second dental jaw digital model, so that the second dental appliance has k2 second shell-shaped dental appliances for gradually moving the patient's teeth from the target tooth layout of the jaw position reconstruction stage to the target tooth layout of the patient's occlusal fine-tuning stage.

[0121] Step S7, obtaining an intermediate jaw digital model representing the actual tooth layout of the patient at the end of the jaw reconstruction phase.

[0122] Similarly, the intermediate jaw digital model can be obtained by converting a silicone rubber intraoral negative mold into a positive mold and then scanning it, or by intraoral scanning, which will not be described in detail here.

[0123] Step S8, generating a third digital model of the teeth and jaws based on the intermediate digital model of the teeth and jaws and the target tooth layout of the jaw position reconstruction stage.

[0124] In this embodiment, the actual tooth layout at the end of the jaw reconstruction stage is obtained based on the acquired intermediate jaw digital model, and then the third jaw digital model is designed according to the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage. The third jaw digital model includes a series of jaw digital models that gradually change from the actual tooth layout of the jaw reconstruction stage to the stage target tooth layout of the jaw reconstruction stage.

[0125] Step S9, designing a third dental appliance based on the third dental jaw digital model, so that the third dental appliance has k3 third shell-shaped dental appliances for gradually adjusting the patient's teeth from the actual tooth layout toward the stage target tooth layout of the jaw reconstruction stage.

[0126] During the actual correction process, if the actual tooth layout at the end of the jaw reconstruction stage is roughly the same as the target tooth layout during the jaw reconstruction stage, there is no need to design a third dental appliance. In this case, after the jaw reconstruction stage is completed, the patient can wear the second dental appliance for correction in the occlusal fine-tuning stage, which can reduce waiting time and shorten the overall correction cycle.

[0127] Therefore, in some embodiments, before the step of generating the third digital model of the dental jaw based on the intermediate digital model of the dental jaw and the stage target tooth layout of the jaw position reconstruction stage, the following steps are also included:

[0128] Acquire the actual tooth layout of the patient after wearing the first dental appliance according to the intermediate dental jaw digital model;

[0129] Calculating the offset between the actual tooth layout and the target tooth layout in the jaw reconstruction stage;

[0130] When the offset exceeds the preset threshold, the third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout of the jaw reconstruction stage, and the subsequent step S9 is executed.

[0131] In this embodiment, the actual tooth coordinate information of each tooth in the patient's dentition is obtained according to the actual tooth layout, including the tooth position coordinate information and the angle coordinate information, and the expected tooth coordinate information of each tooth in the patient's dentition is obtained according to the stage target tooth layout in the jaw reconstruction stage. Taking tooth No. 11 as an example, it is assumed that its actual tooth coordinate information is (x11', y11', z11', θ11'), where x11', y11', z11', θ11' are the X-axis, Y-axis, and Z-axis coordinates in the tooth local coordinate system, respectively. Angular coordinate information; the expected tooth coordinate information of tooth No. 11 is (x11, y11, z11, θ11), x11, y11, z11, θ11 are respectively the X-axis, Y-axis, Z-axis coordinates and angular coordinate information in the local tooth coordinate system, and the offset is calculated according to the actual tooth coordinate information (x11', y11', z11', θ11') and the expected tooth coordinate information (x11, y11, z11, θ11), and the offset includes the sub-offsets of the X-axis, Y-axis, and Z-axis and the sub-offset of the angle θ.

[0132] In some embodiments, the offset of each tooth can be calculated separately, and whether each tooth needs fine-tuning can be determined based on the offset. When there are teeth that need fine-tuning, the third jaw digital model is generated based on the intermediate jaw digital model and the stage target tooth layout of the jaw reconstruction stage, so as to move the current tooth from the actual tooth layout to the stage target tooth layout before entering the dental correction in the occlusal fine-tuning stage. In other embodiments, since the small offset on some teeth has little effect on the wearing of the braces in the subsequent occlusal fine-tuning stage, and the existence of small offset on some teeth will cause discomfort in the subsequent wearing of the braces, therefore, several key teeth can be determined first, and the offset of the key teeth can be calculated separately, and whether the key teeth need fine-tuning can be determined based on the offset of each key tooth. When there are key teeth that need fine-tuning, the third jaw digital model is generated based on the intermediate jaw digital model and the stage target tooth layout of the jaw reconstruction stage, wherein the determination of the key teeth can be predetermined by the doctor or designer based on experience.

[0133] To determine whether each tooth or each key tooth needs fine-tuning, it can be determined whether each sub-offset exceeds the corresponding set threshold. When a sub-offset exceeds the corresponding set threshold, it is determined that the current tooth needs fine-tuning. For example, for tooth No. 11, if the offset of its angle is greater than the corresponding set threshold (for example, 1), it is determined that the tooth needs fine-tuning. Based on the actual tooth layout and the stage target tooth layout of the jaw reconstruction stage, the third dental digital model is generated.

[0134] In some embodiments, for each tooth, considering that different sub-offsets have different effects on the wearing of the appliance in the subsequent occlusal fine-tuning stage, the key sub-offset may be determined first, and for each tooth or each key tooth, it is not necessary to judge each sub-offset, but only to judge whether the key sub-offset exceeds a set threshold. When the key sub-offset exceeds the corresponding set threshold, it is judged that the current tooth needs fine-tuning. The determination of the key sub-offset may be determined manually by a doctor or designer based on experience, or may be determined based on the principal component analysis method after determining the importance of each sub-offset.

[0135] In other embodiments, considering that determining whether each sub-offset of each tooth needs fine-tuning in isolation may also result in inaccurate judgment results, therefore, for each tooth, each sub-offset may be calculated by weighted synthesis before judging the overall offset. However, since the sub-offsets have different dimensions, the values ​​of each sub-offset cannot be directly weighted and synthesized. Therefore, in this embodiment, for sub-offsets in different dimensions, they are normalized and then weighted summed. The result of the weighted summation is then compared with the set comprehensive threshold. If it is greater than the comprehensive threshold, it is judged that the current tooth needs fine-tuning, wherein normalization can be achieved by designing corresponding normalization parameters for each sub-offset. In some preferred embodiments, the normalization parameters of each sub-offset can select the target offset of the jaw reconstruction stage under the corresponding movement mode; specifically, each sub-offset can be normalized according to the following expression: Pi=Mi / Ni, wherein Pi is the result of normalization of each sub-offset, Mi is the value of each sub-offset, and Ni is the normalization parameter corresponding to each sub-offset.

[0136] In some other embodiments, during the actual correction process, when the number of teeth whose offset exceeds the preset threshold is relatively small, the difference between the actual tooth layout and the target tooth layout may not affect the direct wearing of the second dental appliance after the first dental appliance. Therefore, in some other embodiments, after judging whether each tooth needs fine-tuning, the number of teeth that need fine-tuning is counted, and when the proportion of the number of teeth that need fine-tuning to the total number of teeth is greater than or equal to the set value, it is judged that the current patient needs to perform the fine-tuning stage, and the third jaw digital model is generated based on the intermediate jaw digital model and the target tooth layout of the jaw reconstruction stage; when the proportion of the number of teeth that need fine-tuning to the total number of teeth is less than the set value, there is no need to perform the fine-tuning stage, and the occlusal fine-tuning stage is directly performed after the jaw reconstruction is completed, so as to further reduce the waiting time caused by the fine-tuning stage.

[0137] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A dental correction system, characterized in that: include: A first dental appliance, comprising k1 first shell-shaped dental appliances for gradually adjusting a patient's jaw from an initial jaw position to a target jaw position, each first shell-shaped dental appliance comprising a first shell for accommodating and positioning teeth and a jaw repositioning element extending from a buccal or lingual or occlusal surface of the first shell to gradually reposition the patient's misaligned jaw, wherein k1>=1; A second dental appliance, comprising k2 second shell-shaped dental appliances, wherein the second shell-shaped dental appliances are designed to implement a dental treatment plan by gradually moving the patient's teeth from the stage target tooth layout of the first dental appliance to the target tooth layout of the second dental appliance, and the second shell-shaped dental appliance comprises a second shell for accommodating and positioning the teeth, wherein k2>=1; A third dental appliance comprises k3 third shell-shaped dental appliances for gradually adjusting the patient's teeth from the actual tooth layout at the end of wearing the first dental appliance toward the stage target tooth layout of the first dental appliance, wherein the third shell-shaped dental appliance comprises a third shell for accommodating and positioning the teeth, wherein k3>=1.

2. The dental correction system according to claim 1, wherein: The elasticity of each of the third shells in the third dental instrument is the same.

3. The dental correction system according to claim 1, wherein: The elasticity of each of the third shells in the third dental instrument gradually decreases with the wearing sequence.

4. The dental correction system according to claim 3, characterized in that: The elasticity of the third shell with the smallest elasticity in the third dental appliance is the same as the elasticity of the second shell that is the frontmost in the wearing order in the second dental appliance.

5. The dental correction system according to any one of claims 1 to 4, characterized in that: The elasticity of the third shell is greater than the elasticity of the first shell.

6. The dental correction system according to claim 5, characterized in that: The diaphragm of the third shell has the same thickness as that of the first shell, and the elastic modulus of the diaphragm of the third shell is smaller than that of the diaphragm of the first shell.

7. The dental correction system according to claim 5, characterized in that: The elastic modulus of the diaphragm of the third shell is the same as that of the first shell, and the thickness of the diaphragm of the third shell is smaller than the thickness of the diaphragm of the first shell.

8. The dental correction system according to claim 5, characterized in that: The elastic modulus of the third housing diaphragm is smaller than the elastic modulus of the first housing diaphragm, and the diaphragm thickness of the third housing is smaller than the diaphragm thickness of the first housing.

9. The dental correction system according to claim 5, characterized in that: The elastic modulus of the third shell diaphragm is smaller than that of the first shell diaphragm, and the diaphragm thickness of the third shell is greater than that of the first shell, or the thickness of the third shell diaphragm is smaller than that of the first shell diaphragm, and the elastic modulus of the third shell diaphragm is greater than that of the first shell diaphragm.

10. The dental correction system according to claim 5, wherein: The elasticity of the third shell is greater than or equal to the elasticity of the second shell.

11. The dental correction system according to claim 5, wherein: The elasticity of the second shell in the second dental instrument is greater than or equal to the elasticity of the first shell.

12. The dental correction system according to any one of claims 1 to 4, characterized in that: The value of k3 is less than or equal to 10.

13. The dental correction system according to any one of claims 1 to 4, characterized in that: The geometric shapes of the first shells in the first dental appliance are the same, and the first shells with the same geometric shapes are designed not to apply correction force to the dentition of the patient's jaw wearing the appliance.

14. The dental correction system according to any one of claims 1 to 4, characterized in that: The geometric shapes of the first shell bodies in the first dental appliance are different, and the first shell bodies are designed to gradually move the patient's teeth from an initial tooth layout to a target tooth layout in the jaw reconstruction stage to implement a dental correction plan.

15. A method for designing a dental correction system, characterized in that: include: Acquire an initial jaw digital model and target tooth state information, wherein the target tooth state information includes a target jaw position, a target tooth layout in a jaw position reconstruction stage, and a target tooth layout in an occlusal fine-tuning stage; Designing a jaw repositioning element model according to the initial jaw digital model and the target jaw position, specifically including designing the size, shape and preset position of the jaw repositioning element; Based on the initial dental and jaw digital model, the jaw repositioning element model and the stage tooth layout in the jaw reconstruction stage, a first dental and jaw digital model with the jaw repositioning element is generated; designing a first dental appliance based on the first dental-jaw digital model, so that the first dental appliance has k1 first shell-shaped dental appliances for gradually adjusting the patient's jaw from the initial jaw position toward the target jaw position; Generate a digital model of the second jaw based on the target tooth layout in the jaw reconstruction phase and the target tooth layout in the occlusal fine-tuning phase; Designing a second dental appliance based on the first dental jaw digital model so that the second dental appliance has k2 second shell-shaped dental appliances for gradually moving the patient's teeth from the stage target tooth layout of the first dental appliance to the target tooth layout of the patient's occlusal fine-tuning stage; Obtaining a digital model of the intermediate jaw that represents the patient's actual dental layout at the end of the jaw reconstruction phase; Generate a third digital model of the dental jaw based on the intermediate digital model of the dental jaw and the stage target tooth layout of the jaw position reconstruction stage; A third dental appliance is designed based on the third dental jaw digital model so that the third dental appliance has k3 third shell-shaped dental appliances for gradually adjusting the patient's teeth from the actual tooth layout toward the stage target tooth layout of the jaw position reconstruction stage.

16. The method for designing a dental correction system according to claim 15, wherein: Before the step of generating a third digital model of teeth and jaws based on the intermediate digital model of teeth and jaws and the stage target tooth layout of the jaw position reconstruction stage, the method further includes: Acquire the actual tooth layout of the patient after wearing the first dental appliance according to the intermediate dental jaw digital model; Calculating the offset between the actual tooth layout and the stage target tooth layout; When the offset exceeds a preset threshold, the third dental jaw digital model is generated according to the intermediate dental jaw digital model and the stage target tooth layout.

17. The method for designing a dental correction system according to claim 16, wherein: The calculating the offset between the actual tooth layout and the stage target tooth layout comprises: Acquire actual tooth coordinate information and stage target tooth coordinate information of each tooth in the patient's dentition, wherein both the actual tooth coordinate information and the stage target tooth coordinate information include tooth position coordinate information and angle coordinate information; The offset is calculated based on the actual tooth coordinate information and the stage target tooth coordinate information, and the offset includes sub-offsets corresponding to the X-axis, Y-axis, and Z-axis and an angle sub-offset.

18. The method for designing a dental correction system according to claim 17, wherein: When the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout, comprising: Determine for each tooth or each key tooth in turn whether each sub-offset of the current tooth exceeds a corresponding set threshold; When a sub-offset exceeds the corresponding set threshold, it is determined that the current tooth needs to be fine-tuned; The third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout.

19. The method for designing a dental correction system according to claim 17, wherein: When the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout, comprising: determining a critical sub-offset among each sub-offset of each tooth; Determine for each tooth or each key tooth in turn whether each key sub-offset of the current tooth exceeds a corresponding set threshold; When a certain critical sub-offset exceeds the corresponding set threshold, it is determined that the current tooth needs to be fine-tuned; The third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout.

20. The method for designing a dental correction system according to claim 17, wherein: When the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout, comprising: For each tooth or each key tooth, normalizing each sub-offset of the current tooth in turn to obtain each normalized sub-offset; Perform weighted summation on the normalized sub-offsets; Based on the comparison between the weighted sum result and the comprehensive threshold, if it is greater than the comprehensive threshold, it is determined that the current tooth needs to be fine-tuned; The third dental jaw digital model is generated based on the intermediate dental jaw digital model and the stage target tooth layout.

21. The method for designing a dental correction system according to claim 17, wherein: When the offset exceeds a preset threshold, generating the third dental jaw digital model according to the intermediate dental jaw digital model and the stage target tooth layout, further comprising: For each tooth, determining the tooth that needs to be fine-tuned based on the offset of the tooth and a preset threshold; Count the number of teeth that need fine-tuning; Whether the third dental jaw digital model needs to be generated is determined based on the ratio of the number of teeth that need to be fine-tuned to the number of teeth in the current dentition.

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