Orthodontic archwire multi-stage self-adaptive selection method and system

Abstract

The present application relates to the technical field of medical instrument information digitization application, and particularly relates to an orthodontic archwire multi-stage self-adaptive matching method and system. The method of the scheme comprises the following steps: obtaining a three-dimensional model of upper and lower dental arches, a bite record, and a candidate set of upper and lower archwires with virtual tooth arrangement results; pairing the upper and lower candidate archwires two by two; and constructing a virtual upper and lower dental arch under a unified bite position relationship according to the corresponding virtual tooth arrangement results and the bite record. The bite function partition activation state and detection condition are determined according to the current treatment stage, the bite of each activated partition is detected, the bite coordination state of the archwire pairing is determined according to the detection result, and the candidate archwire pairing that meets the requirements of the current stage is screened and output. The present application can perform partition bite detection on the upper and lower candidate archwire pairing under a unified bite position relationship, and screen out the candidate archwire pairing that meets the corresponding bite requirements according to the current treatment stage.

Description

Technical Field

[0001] This invention relates to the field of digital application technology of medical device information, and in particular to a multi-stage adaptive selection method and system for orthodontic archwires. Background Technology

[0002] During orthodontic treatment, the archwire's shape, specifications, and its compatibility with the patient's dentition affect the expected tooth movement and final occlusion. Current clinical fitting methods typically involve physicians determining the archwire's shape based on dentition morphology, archwire shape, and treatment stage. Some digital systems can match or recommend candidate archwires based on the archwire characteristics of a single dentition.

[0003] Current digital archwire fitting methods typically evaluate individual dentitions separately, assessing the fit between the maxillary or mandibular archwire and the corresponding dentition. Under this method, even if the maxillary and mandibular archwires meet the arch shape matching requirements of their respective dentitions, inconsistencies in contact between the maxillary and mandibular dentitions may still occur when they are combined. For example, some anterior tooth areas may be close or aligned, but the posterior tooth areas may not achieve the expected contact, or there may be spatial overlap between local tooth surfaces. The results of individual dentition evaluations cannot directly reflect the occlusal relationship after the combination of the maxilla and mandible.

[0004] Furthermore, different tooth positions bear different occlusal functions. The anterior region typically requires evaluation of the overjet relationship between the upper and lower anterior teeth, while the premolar and molar regions require evaluation of the contact relationship between the opposing occlusal surfaces. If the same testing conditions are used to evaluate all tooth positions, it may not be possible to reflect the occlusal requirements of different regions separately.

[0005] Orthodontic treatment includes different stages, each with different tooth positions and occlusal adjustment goals. In the early stages, the relationships between some posterior teeth may not yet be stable, while in later stages, stricter occlusal requirements are needed for more areas. If a fixed testing range and fixed contact judgment conditions are used in all stages, the test results may not match the actual requirements of the current treatment stage.

[0006] Therefore, there is a need for an orthodontic archwire fitting method that can evaluate candidate archwires for both the maxilla and mandible in combination and perform occlusal testing according to occlusal functional zones and the current treatment stage under a unified occlusal positional relationship, so as to improve the correspondence between the candidate archwire matching evaluation results and the staged occlusal requirements. Summary of the Invention

[0007] To address the technical problems existing in the prior art, the present invention provides a multi-stage adaptive selection method and system for orthodontic archwires, which can perform occlusal detection of candidate archwire pairings for the maxilla and mandible under a unified occlusal position relationship, and select candidate archwire pairings that meet the corresponding occlusal requirements based on the current treatment stage.

[0008] This invention provides a multi-stage adaptive selection method for orthodontic archwires, comprising the following steps:

[0009] A three-dimensional model of the maxillary dentition, a three-dimensional model of the mandibular dentition, an occlusal record, a candidate set of maxillary archwires, and a candidate set of mandibular archwires are obtained. Each candidate maxillary archwire in the candidate set of maxillary archwires and each candidate mandibular archwire in the candidate set of mandibular archwires has a corresponding virtual tooth arrangement result. The virtual tooth arrangement result represents the expected three-dimensional position and posture of each tooth after the corresponding candidate archwire is applied.

[0010] The candidate archwires in the maxillary archwire candidate set and the candidate archwires in the mandibular archwire candidate set are paired up to obtain multiple candidate archwire pairs;

[0011] For each candidate archwire pairing, the three-dimensional models of the maxillary and mandibular dentitions are transformed according to the virtual tooth arrangement results corresponding to the candidate archwire pairing. Based on the occlusion record, the transformed three-dimensional models of the maxillary and mandibular dentitions are spatially registered to the same occlusal position relationship to form a virtual maxillary and mandibular dentitions in a unified coordinate system.

[0012] The detection parameters are determined based on the current treatment stage. The detection parameters include the activation status of multiple occlusal functional zones and the occlusal detection conditions corresponding to each activated occlusal functional zone. The multiple occlusal functional zones are detection areas pre-divided according to tooth position and the occlusal function undertaken by the tooth position. The occlusal detection conditions include at least the contact judgment tolerance.

[0013] According to the occlusal testing conditions corresponding to each activated occlusal functional zone, occlusal testing is performed on each activated occlusal functional zone of the virtual maxillary and mandibular dentition to obtain the testing results for each activated occlusal functional zone; and,

[0014] Based on the detection results of each enabled occlusal functional zone, the occlusal coordination status of the candidate archwire pairings is determined, and candidate archwire pairings that meet the occlusal detection conditions of each enabled occlusal functional zone corresponding to the current treatment stage are screened and output.

[0015] It is understood that the technical solution of the present invention specifically relates to a method for combining and selecting orthodontic archwires based on the occlusal relationship of the virtual dentition of the upper and lower jaws and the detection conditions of the treatment stage.

[0016] In this method, three-dimensional models of the patient's maxillary and mandibular dentitions, as well as occlusal records, are first acquired. The maxillary and mandibular dentition models represent the three-dimensional morphology and spatial position of the patient's upper and lower teeth, while the occlusal records represent the relative positional relationship of the upper and lower dentitions under a predetermined occlusal state. The three-dimensional models can be formed by intraoral scanning, model scanning, or other methods capable of obtaining three-dimensional surface data of the dentition; the specific acquisition method is not a limitation of this method.

[0017] Simultaneously, candidate sets of maxillary and mandibular archwires are acquired. Each candidate maxillary archwire in the maxillary archwire candidate set, and each candidate mandibular archwire in the mandibular archwire candidate set, has a corresponding virtual tooth alignment result. The virtual tooth alignment result represents the expected three-dimensional position and orientation of each tooth after the corresponding archwire is applied to the patient's dentition. The three-dimensional position can include the position of the tooth in a spatial coordinate system, and the orientation can include the rotational state of the tooth around one or more coordinate axes. The virtual tooth alignment result can be generated by existing digital tooth alignment software or orthodontic biomechanics simulation system. This method uses the virtual tooth alignment result as input for subsequent occlusal testing and does not require recalculating the tooth movement process under the action of the archwire.

[0018] After obtaining the candidate sets of maxillary and mandibular archwires, candidate maxillary archwires in the maxillary archwire candidate set are paired with candidate mandibular archwires in the mandibular archwire candidate set. Assuming the maxillary archwire candidate set includes multiple candidate maxillary archwires and the mandibular archwire candidate set includes multiple candidate mandibular archwires, each candidate maxillary archwire can be paired with a candidate mandibular archwire from the mandibular archwire candidate set. Each candidate archwire pair contains one candidate maxillary archwire and one candidate mandibular archwire, corresponding to a set of virtual tooth arrangement results for the maxilla and mandible.

[0019] For each candidate archwire pairing, spatial transformation is performed on the three-dimensional models of the maxillary and mandibular dentition based on the corresponding virtual tooth arrangement. This spatial transformation yields the expected spatial positions and tooth postures of the maxillary and mandibular dentition after the candidate archwire pairing is applied. Since the maxillary and mandibular dentition models may reside in different initial coordinate references, spatial registration of the transformed three-dimensional models of the maxillary and mandibular dentition is also required based on occlusal records.

[0020] Spatial registration is used to align the maxillary and mandibular dentitions within the same occlusal position and coordinate system. This occlusal position can be the maximum intercuspal position determined by the occlusal record or the closed occlusal position specified in the treatment plan. After registration, the maxillary and mandibular dentitions form a virtual maxillary and mandibular dentition in the same coordinate system. Subsequent occlusal tests are performed using this virtual maxillary and mandibular dentition, ensuring that the test results reflect the overall occlusal relationship formed by the combined maxillary and mandibular archwires, rather than evaluating individual archwires independently.

[0021] After creating a virtual maxillary and mandibular dentition, the testing parameters are determined based on the patient's current treatment stage. Orthodontic treatment typically involves multiple stages with different occlusal requirements, and the tooth positions, posterior tooth relationships, and occlusal adjustment goals are not entirely the same at different stages. Therefore, this method does not use the same testing conditions for all treatment stages, but rather establishes a correspondence between treatment stages and testing parameters.

[0022] The detection parameters include the activation status of multiple occlusal functional zones and the corresponding occlusal detection conditions for each activated occlusal functional zone. Occlusal functional zones are pre-defined detection areas based on tooth position and the occlusal function each tooth performs. Different tooth positions perform different occlusal functions in orthodontic treatment; therefore, corresponding detection conditions can be set according to the region to which the tooth position belongs. For example, the anterior tooth region can focus on evaluating the anteroposterior overjet relationship of the upper and lower anterior teeth; the premolar region can focus on evaluating whether contact is formed between the upper and lower tooth surfaces; and the molar region can evaluate the contact relationship of posterior teeth or, more specifically, the cusp-fossa relationship, depending on the treatment stage. Claim 1 does not limit the number of occlusal functional zones or the specific tooth position range; the specific zoning method can be set according to the patient's dental structure and treatment plan.

[0023] Each occlusal functional zone also has a corresponding activation status. The activation status determines whether the test results of a particular occlusal functional zone should be included in the evaluation of candidate archwire pairings at the current treatment stage. For example, in the early treatment stage, the anterior and premolar zones can be activated, while the molar zone is not considered a rejection criterion for archwire pairing; in later treatment stages, more occlusal functional zones can be activated, and stricter testing requirements can be imposed on posterior tooth relationships. By setting the activation status, the testing process can be adapted to the tooth movement status at the current treatment stage.

[0024] The occlusal detection conditions include at least a contact tolerance. The contact tolerance is used to determine whether the distance between the relative functional surfaces of the maxilla and mandible meets the contact requirements. For a given occlusal functional zone, the system can extract the maxillary and mandibular functional surfaces within that zone and calculate the spatial distance between them. When the calculated shortest distance is not greater than the contact tolerance corresponding to the current treatment stage, the zone can be considered to have the basic occlusal contact requirements. In actual testing, the contact results can also be corrected by considering whether spatial penetration occurs in the 3D mesh, to avoid misjudging overlapping maxillary and mandibular tooth models as normal contact.

[0025] Subsequently, occlusal testing was performed on the virtual maxillary and mandibular dentition according to the occlusal testing conditions corresponding to each activated occlusal functional zone. Each occlusal functional zone generated a corresponding test result, which could include "qualified," "unqualified," "missing contact," "penetration," or other states corresponding to the testing conditions of that zone. Different zones could use different testing methods, and the test results could be saved separately for subsequent determination of the overall status of candidate archwire pairing.

[0026] After obtaining the test results for each activated occlusal functional zone, the occlusal coordination status of the candidate archwire pairings is determined based on these results. The occlusal coordination status indicates whether, when a candidate maxillary archwire and a candidate mandibular archwire are combined, a compliant overall occlusal relationship is formed for the multiple occlusal functional zones required in the current treatment stage. Candidate archwire pairings where the anterior zones do not meet the requirements are determined to be uncoordinated; candidate archwire pairings where the anterior zones meet the requirements but some posterior zones do not are output as posterior zones to be adjusted; candidate archwire pairings where all activated occlusal functional zones in the current stage meet the test conditions are determined to be fully coordinated.

[0027] Finally, candidate archwire pairs that meet the occlusal testing conditions for each enabled occlusal functional zone corresponding to the current treatment stage are selected and output. The output results may include candidate maxillary archwires, candidate mandibular archwires, the corresponding occlusal coordination status, and the test results for each zone. For candidate archwire pairs that fail the test, the unqualified zones and corresponding test reasons can also be output so that users can understand the specific reasons why the candidate archwire pair was not selected.

[0028] Through the steps described above, this method evaluates maxillary and mandibular archwires as a combined object, and uses the virtual maxillary and mandibular dentition assembled with candidate archwires as the object of occlusal testing, extending the archwire selection process from single-arch matching to collaborative evaluation of maxillary and mandibular occlusion. Furthermore, by establishing the correlation between treatment stage, occlusal functional zones, activation status, and contact judgment tolerance, the testing conditions can be adjusted according to the current treatment stage.

[0029] The technical effects of the intelligent verification and control method and equipment for sandblasting uniformity of orthodontic brackets of the present invention include:

[0030] 1. This method involves pairing maxillary and mandibular candidate archwires in pairs and performing occlusal testing on the virtual maxillary and mandibular dentition corresponding to each archwire pair. This allows for the evaluation of the overall occlusal relationship formed by combining the maxillary and mandibular archwires. Compared to evaluating maxillary and mandibular archwires separately, this approach can identify candidate archwire pairs that appear to match individually but exhibit occlusal incoordination when combined.

[0031] 2. By registering the transformed maxillary and mandibular dentition to the same occlusal position through occlusal recording, different candidate archwire pairs can be compared under a unified spatial reference, reducing contact position deviations caused by different coordinate references of the maxillary and mandibular models. The test results can directly correspond to the relative positional relationship of the maxillary and mandibular dentition under the predetermined occlusal state.

[0032] 3. By pre-dividing multiple occlusal functional zones according to tooth position and the occlusal function each tooth undertakes, and setting the activation status and occlusal testing conditions for each zone, it is possible to avoid using the same evaluation method for different tooth positions. Anterior teeth, premolars, and molars can be tested under corresponding conditions according to their different occlusal functions, which helps to make the test results correspond to the regional occlusal requirements in orthodontic treatment.

[0033] 4. By determining the testing parameters based on the current treatment stage, different testing ranges and contact tolerances can be used for early, intermediate, and late treatment stages. In the early stages, the impact of unstable areas on archwire matching screening can be reduced, while later stages can gradually include more areas and adopt stricter contact requirements. This allows the same testing procedure to be applied to different treatment stages, avoiding the use of fixed testing conditions to evaluate the entire orthodontic treatment process.

[0034] 5. By obtaining the test results of each activated occlusal functional zone separately, and determining the occlusal coordination status of candidate archwire pairings accordingly, the system can retain the test information of each zone, rather than simply outputting a comprehensive result lacking explanation. For candidate archwire pairings that do not meet the requirements, the zones that failed the test can be further identified, providing a basis for archwire selection and subsequent treatment plan adjustments. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the system module architecture of the present invention;

[0037] Figure 2 This is a schematic diagram of the five occlusal contact functional zones of the maxillary dental arch of the present invention;

[0038] Figure 3 This is a schematic diagram of the overall process of the bowwire pairing detection of the present invention;

[0039] Figure 4 This is a schematic diagram of the three-step determination of the cusp-fossa intersection in the molar region according to the present invention;

[0040] Figure 5 This is a schematic diagram of the projection detection relationship of the anterior tooth region on the sagittal plane according to the present invention;

[0041] Figure 6 This is a schematic diagram of the logic flow for priority detection of key tooth positions within a partition in this invention;

[0042] Figure 7 This is a schematic diagram of the three translational directions for mandibular micro-perturbation detection according to the present invention.

[0043] Figure label:

[0044] none. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0046] Combination Figures 1 to 7 As shown in the figure. This embodiment provides a multi-stage adaptive fitting system for orthodontic archwires. The system runs on a computing device with a processor and memory, and can also be implemented jointly by a communicating server and client. The processor is used to perform candidate archwire pairing, virtual maxillary and mandibular dentition construction, stage parameter calling, occlusal functional zone detection, and occlusal coordination status determination. The memory is used to store the patient's 3D dentition model, occlusal records, candidate archwire data, virtual tooth arrangement results, occlusal functional zone data, treatment stage detection parameters, and candidate archwire pairing detection results.

[0047] like Figure 1 As shown, the system includes a candidate data acquisition module, an occlusal contact zone mapping module, an archwire pairing module, a virtual dentition construction module, a stage parameter configuration module, a zoned occlusal detection module, and a collaborative judgment output module.

[0048] The candidate data acquisition module is used to acquire the patient's three-dimensional models of the maxillary and mandibular dentition, occlusion records, and candidate sets of maxillary and mandibular archwires. The candidate data acquisition module may include a maxillary archwire candidate generation submodule and a mandibular archwire candidate generation submodule. The maxillary archwire candidate generation submodule is used to filter candidate maxillary archwires from the archwire database based on the arch shape characteristics of the patient's maxillary dentition, and the mandibular archwire candidate generation submodule is used to filter candidate mandibular archwires from the archwire database based on the arch shape characteristics of the patient's mandibular dentition.

[0049] Each candidate archwire in the maxillary and mandibular archwire candidate sets has a corresponding virtual tooth alignment result. The virtual tooth alignment result represents the expected three-dimensional position and orientation of each tooth after the corresponding candidate archwire is applied. The three-dimensional position includes the position of the tooth object in the spatial coordinate system, and the orientation includes the rotation state of the tooth object about one or more coordinate axes.

[0050] A 3D model of the patient's dentition can be obtained using an intraoral 3D scanner or a model scanner. The 3D model can be represented using a triangular mesh surface, which includes the geometric information of the tooth crown surfaces. After importing the 3D model into the system, the scanning base, isolated meshes, and significant noise can be removed, and each tooth can be divided into independent tooth position objects. Each tooth position object has a corresponding tooth position identifier.

[0051] Tooth segmentation and identification can be obtained using existing methods such as gingival margin recognition, crown contour recognition, or dentition model segmentation. This process allows for the creation of an independent tooth position object for each tooth, providing tooth position identification for subsequent occlusal functional area mapping. This process does not alter the execution process of candidate archwire pairing and occlusal coordination detection.

[0052] The candidate archwire records in the archwire database may include candidate identifiers, applicable jaw types, archwire shape parameters, applicable treatment stages, and virtual tooth alignment results. Archwire shape parameters can be represented using discrete centerline points of a pre-formed arch, archwire equation parameters, or a digital archwire design file. Virtual tooth alignment results can be generated by existing digital tooth alignment software. This embodiment uses the virtual tooth alignment results and does not further limit the tooth movement calculation process under the action of the archwire.

[0053] The occlusion record is used to determine the relative positions of the maxillary and mandibular dentitions in a predetermined occlusal state. The predetermined occlusal state can be the maximum intercuspal position or the closed occlusion position specified in the treatment plan. The system obtains the occlusal position registration transformation between the maxillary and mandibular dentitions based on the occlusion record and saves the occlusal position registration transformation in memory.

[0054] This embodiment establishes a unified patient coordinate system, where the X-axis points to the patient's left side, the Y-axis points to the patient's front, and the Z-axis points upward. By using a unified patient coordinate system, maxillary dentition models, mandibular dentition models, and virtual tooth arrangement results from different sources can be placed in the same spatial reference.

[0055] Specifically, the occlusal contact zone mapping module is used to divide the tooth objects participating in the detection into multiple occlusal function zones according to the tooth position and the occlusal function undertaken by the tooth position, and to establish the correspondence between each occlusal function zone and the corresponding tooth object. The data of the occlusal function zone may include the zone identifier, the tooth position identifier, the functional surface participating in the detection, and the zone detection conditions.

[0056] The archwire pairing module is used to pair candidate archwires from the maxillary archwire candidate set and the mandibular archwire candidate set in pairs to obtain multiple candidate archwire pairs. Each candidate archwire pair includes one candidate maxillary archwire and one candidate mandibular archwire.

[0057] The virtual dentition construction module is used to transform the three-dimensional models of the maxillary and mandibular dentitions for each candidate archwire pairing based on the corresponding virtual tooth arrangement results, and to spatially register the transformed three-dimensional models of the maxillary and mandibular dentitions to the same occlusal position relationship based on the occlusal record, thus forming a virtual maxillary and mandibular dentition located in a unified patient coordinate system.

[0058] Specifically, the system reads the maxillary tooth position transformation set corresponding to the candidate maxillary archwire and the mandibular tooth position transformation set corresponding to the candidate mandibular archwire, and applies the two transformation sets to the maxillary dentition model and the mandibular dentition model, respectively. After completing the above transformation, the system registers the transformed mandibular dentition to the unified patient coordinate system where the transformed maxillary dentition is located, based on the occlusal position registration transformation corresponding to the occlusal record.

[0059] The stage parameter configuration module is used to determine the detection parameters based on the current treatment stage. The detection parameters include the activation status of multiple occlusal functional zones and the occlusal detection conditions corresponding to each activated occlusal functional zone. The occlusal detection conditions include at least the contact judgment tolerance.

[0060] The current treatment stage can be obtained from the stage information in the digital treatment plan, or it can be selected by the operator in the system interface. During the same fitting calculation process, all candidate archwire pairs use the same set of test parameters corresponding to the current treatment stage, thereby ensuring that different candidate archwire pairs are compared under the same conditions.

[0061] The partitioned occlusion detection module is used to perform occlusion detection on each enabled occlusion function zone of the virtual maxillary and mandibular dentition according to the occlusion detection conditions corresponding to each enabled occlusion function zone, and obtain the detection results of each enabled occlusion function zone.

[0062] The collaborative determination output module is used to determine the occlusal collaboration status of candidate archwire pairs based on the detection results of each enabled occlusal functional zone, and to filter and output candidate archwire pairs that meet the occlusal detection conditions of each enabled occlusal functional zone corresponding to the current treatment stage. The output content may include candidate archwire pair identifier, occlusal collaboration status, zone detection results, failed zone, and failure type.

[0063] Specifically, this embodiment includes an early alignment stage, an intermediate gap closing stage, and a late fine adjustment stage.

[0064] In the early alignment stage, the anterior, left premolar, and right premolar regions are used, and the test results of the left and right molar regions are not used as the rejection criteria for candidate archwire pairing. The first-level contact judgment tolerance is used in the early alignment stage.

[0065] During the intermediate gap-closing phase, the anterior, left premolar, right premolar, left, and right molar regions are used. The second-level contact tolerance is applied during this phase. For the left and right molar regions, at least one pair of maxillary molar occlusal surfaces and mandibular molar occlusal surfaces must exist, such that the shortest Euclidean distance between these pairs of occlusal surfaces does not exceed the second-level contact tolerance, and there is no penetration between these pairs of occlusal surfaces.

[0066] In the later fine-tuning stage, all occlusal functional zones are activated. The third-level contact judgment tolerance is adopted in the later fine-tuning stage, and it is required that there be at least one combination of maxillary and mandibular molars in both the left and right molar regions that meets the cusp-fossa intercuspal contact condition.

[0067] The first contact judgment tolerance corresponding to the early alignment stage is greater than the second contact judgment tolerance corresponding to the mid-term gap closing stage. The second contact judgment tolerance corresponding to the mid-term gap closing stage is greater than the third contact judgment tolerance corresponding to the late-term fine adjustment stage. The specific value of the contact judgment tolerance can be preset according to the 3D scanning accuracy, mesh error, and detection requirements.

[0068] Combination Figure 3 As shown, based on the system architecture of the above embodiments, this embodiment also provides a multi-stage adaptive selection method for orthodontic archwires, specifically including the following steps:

[0069] S1: Obtain the three-dimensional model of the maxillary dentition, the three-dimensional model of the mandibular dentition, the occlusion record, the candidate set of maxillary archwires, and the candidate set of mandibular archwires.

[0070] Each candidate maxillary archwire in the candidate set and each candidate mandibular archwire in the candidate set has a corresponding virtual tooth alignment result. The virtual tooth alignment result represents the expected three-dimensional position and orientation of each tooth after the corresponding candidate archwire is applied.

[0071] The candidate sets for maxillary and mandibular archwires can be selected from the archwire database based on the arch shape characteristics of the corresponding jaw's dentition. If the applicable treatment stage in the candidate archwire database does not match the current treatment stage, the candidate archwire can be excluded during the candidate data preparation stage.

[0072] S2, pair the candidate archwires in the maxillary archwire candidate set and the mandibular archwire candidate set to obtain multiple candidate archwire pairs.

[0073] Let the candidate set of maxillary archwires be U and the candidate set of mandibular archwires be L. Then the system will pair each candidate maxillary archwire in U with each candidate mandibular archwire in L, thereby forming multiple candidate archwire pairs.

[0074] The candidate set of maxillary archwires is represented as follows:

[0075] U={u1,u2,...,um}

[0076] The candidate set of mandibular archwires is represented as follows:

[0077] L={l1,l2,...,ln}

[0078] Each candidate archwire pair is represented as:

[0079] Pij=(ui,lj)

[0080] Where ui is the i-th candidate maxillary archwire, and lj is the j-th candidate mandibular archwire. The system performs subsequent virtual dentition construction and occlusion detection on each candidate archwire pair.

[0081] S3. For each candidate archwire pairing, the three-dimensional models of the maxillary and mandibular dentitions are transformed according to the corresponding virtual tooth arrangement results. Based on the occlusal record, the transformed three-dimensional models of the maxillary and mandibular dentitions are spatially registered to the same occlusal position relationship, forming a virtual maxillary and mandibular dentitions in a unified coordinate system.

[0082] Specifically, the system reads the maxillary tooth position transformation set PUi corresponding to the candidate maxillary archwire ui and the mandibular tooth position transformation set PLj corresponding to the candidate mandibular archwire lj from the candidate archwire pairing Pij. The system transforms the crown mesh of each maxillary tooth position according to PUi, transforms the crown mesh of each mandibular tooth position according to PLj, and then registers the mandibular dentition to the unified patient coordinate system where the maxillary dentition is located according to the occlusal position registration transformation corresponding to the occlusal record.

[0083] If a candidate archwire pair lacks virtual tooth alignment transformation data corresponding to any of the teeth involved in the test, the system can mark the candidate archwire pair as having incomplete data and stop performing subsequent occlusion tests on that candidate archwire pair.

[0084] S4, determine the testing parameters based on the current stage of treatment.

[0085] The system reads the detection parameters corresponding to the current treatment stage, determines the occlusal functional zones activated in the current stage, the contact judgment tolerance of each zone, and the detection conditions corresponding to each zone.

[0086] During the early alignment phase, the system utilizes the anterior, left premolar, and right premolar regions. The left and right molar regions retain their geometric detection data, but these results are not used to exclude candidate archwire pairs.

[0087] During the intermediate gap closure phase, the system activates all occlusal functional zones and includes the left and right molar regions in the qualification criteria for candidate archwire pairing.

[0088] In the later fine-tuning stage, the system activated all occlusal functional zones and adopted the cusp-fossa interleaving detection condition in the molar area.

[0089] S5. According to the occlusal testing conditions corresponding to each enabled occlusal functional zone, perform occlusal testing on each enabled occlusal functional zone of the virtual maxillary and mandibular dentition.

[0090] After completing the testing of each enabled occlusal functional zone, the system saves the test results corresponding to each occlusal functional zone. The test results for the anterior teeth zone can include the determination of anterior crossbite and overbite relationship; the test results for the premolar zone can include the determination of occlusal contact and penetration; and the test results for the molar zone can include the determination of normal occlusal contact or cusp-fossa intercuspal relationship.

[0091] S6. Based on the test results of each enabled occlusal functional zone, determine the occlusal coordination status of candidate archwire pairings, and screen and output candidate archwire pairings that meet the occlusal test conditions of each enabled occlusal functional zone corresponding to the current treatment stage.

[0092] Figure 3 The overall process of bowwire pairing detection is shown. Figure 3 S1 corresponds to the generation of candidate paired virtual dentition, S2 corresponds to the determination of the current stage enabled partition, S3 corresponds to the zone-by-zone detection of the anterior tooth zone, premolar zone and molar zone, S4 corresponds to the determination of occlusal coordination status, and S5 corresponds to the output of candidate archwire pairing and partition detection results.

[0093] Specifically, such as Figure 2As shown, in this embodiment, the occlusal surface of the dental arch is divided into the anterior tooth region, the left premolar region, the right premolar region, the left molar region, and the right molar region.

[0094] Tooth position numbering adopts the FDI two-digit tooth position numbering method. The anterior tooth region includes the incisal and lingual surfaces of maxillary teeth 13, 12, 11, 21, 22 and 23, and the labial surfaces of mandibular teeth 43, 42, 41, 31, 32 and 33 that are opposite to the lingual surfaces of the maxillary anterior teeth.

[0095] The left premolar region includes the occlusal surfaces of teeth 24, 25, 34, and 35. The right premolar region includes the occlusal surfaces of teeth 14, 15, 44, and 45. The left molar region includes the occlusal surfaces of teeth 26, 27, 36, and 37. The right molar region includes the occlusal surfaces of teeth 16, 17, 46, and 47.

[0096] Each occlusal functional zone is associated with a corresponding tooth object through tooth position identifiers. The system determines the occlusal functional zone to which each tooth belongs based on its tooth position identifier. When performing virtual tooth alignment transformation on a tooth object, the position and orientation of the tooth object change with the corresponding virtual tooth alignment result, but the tooth position identifier and the occlusal functional zone to which the tooth object belongs remain unchanged.

[0097] When a tooth position is absent in the patient's 3D dental arch model, the system does not perform occlusal testing on that tooth position, but this does not affect the participation of other present tooth positions in the same occlusal functional zone in the testing. Therefore, the system can handle situations where some tooth positions are missing in the dental arch model.

[0098] Furthermore, for any enabled occlusal functional zone, the system obtains the maxillary and mandibular functional surface meshes within that zone based on the corresponding tooth position object. The functional surface mesh can be composed of mesh faces belonging to the corresponding occlusal functional zone from the triangular mesh on the crown surface.

[0099] Let the maxillary functional surface mesh be A and the mandibular functional surface mesh be B. The system calculates the shortest Euclidean distance between A and B, and the calculation relationship is expressed as follows:

[0100] d(A,B)=min||ab||

[0101] Where a is a sampling point on the maxillary functional surface grid A, and b is a sampling point on the mandibular functional surface grid B.

[0102] When the shortest Euclidean distance d(A,B) is not greater than the contact judgment tolerance corresponding to the current treatment stage, and there is no penetration between the maxillary functional surface grid A and the mandibular functional surface grid B, the system determines that the maxillary functional surface grid and the mandibular functional surface grid form a qualified occlusal contact.

[0103] The term "penetration" refers to the spatial overlap of the triangular faces of the maxillary and mandibular functional surface meshes, where the overlap depth exceeds a preset allowable geometric error. This allowable geometric error is used to exclude minor errors arising from scan mesh triangulation and numerical calculations.

[0104] If there is penetration between the maxillary and mandibular functional surface grids within a certain occlusal functional zone, the system will still classify that occlusal functional zone as unqualified, even if the shortest Euclidean distance between the maxillary and mandibular functional surface grids is not greater than the contact judgment tolerance. Penetration judgment takes precedence over qualified occlusal contact judgment.

[0105] In one implementation, the system first uses the bounding box hierarchy of the triangular mesh to filter out triangular facet groups whose distances to each other are greater than the contact determination tolerance. Then, it performs point-to-face distance calculation and facet intersection detection on the remaining triangular facet groups. This processing method is used to reduce the number of triangular faces to be calculated.

[0106] Furthermore, such as Figure 5 As shown, anterior tooth region detection is performed based on the Y-axis and Z-axis in a unified patient coordinate system. The Y-axis points forward of the patient, and the Z-axis points upward. The system projects the sampling surfaces of the lingual surfaces of the maxillary anterior teeth and the labial surfaces of the mandibular anterior teeth onto the sagittal plane formed by the Y-axis and Z-axis.

[0107] Within the overlapping area of ​​the projection regions of the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth in the vertical direction, the system determines the relative positions of the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth in the anterior-posterior direction at each vertical projection position.

[0108] When the lingual surface of the maxillary anterior teeth is located behind the labial surface of the mandibular anterior teeth in all vertical projections within the overlapping area, the system determines that anterior crossbite exists.

[0109] The system determines the anterior tooth region to be acceptable if there is no penetration within the anterior tooth region and any of the following conditions are met:

[0110] First, at at least one vertical projection position, the lingual surface of the maxillary anterior teeth is located in front of the labial surface of the mandibular anterior teeth.

[0111] Second, in the absence of anterior crossbite, the shortest Euclidean distance between the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth is not greater than the contact judgment tolerance corresponding to the current treatment stage.

[0112] Figure 5 The normal overlay state in the text refers to the situation where the lingual surface of the maxillary anterior teeth is located in front of the labial surface of the mandibular anterior teeth. Figure 5 The anterior crossbite state in the comparison refers to the situation where the lingual surface of the maxillary anterior teeth is located behind the labial surface of the mandibular anterior teeth in all the positions involved in the comparison.

[0113] Furthermore, occlusal testing was performed independently in the left and right premolar regions. Taking the left premolar region as an example, the system extracted the maxillary and mandibular occlusal surface meshes corresponding to teeth 24, 25, 34, and 35, and calculated the shortest Euclidean distance between possible combinations of maxillary and mandibular premolar occlusal surfaces that could occlude with each other.

[0114] The system determines the left premolar region to be acceptable when the shortest Euclidean distance between at least one pair of maxillary and mandibular premolar occlusal surfaces is not greater than the contact tolerance for the current stage, and there is no penetration between these occlusal surfaces. If the shortest Euclidean distance between all combinations of maxillary and mandibular premolar occlusal surfaces is greater than the contact tolerance, or if the detected contact corresponds to penetration of the upper and lower tooth models, the system determines the left premolar region to be unacceptable.

[0115] The right anterior molar region is processed in the same way as the left anterior molar region, and the test results for the right anterior molar region are output independently.

[0116] During the early alignment stage, the test results for the left and right molar regions are not used as elimination criteria for current candidate archwire pairings. During the intermediate gap-closing stage, occlusal contact testing is performed on the left and right molar regions separately. The molar region on the same side is considered qualified if the shortest Euclidean distance between at least one pair of maxillary molar occlusal surfaces and mandibular molar occlusal surfaces is not greater than the intermediate contact tolerance and there is no penetration.

[0117] Preferably, in the later fine-tuning stage, in addition to occlusal contact testing, cusp-fossa intercuspal testing is also performed on the molar region. The left and right molar regions are tested independently.

[0118] like Figure 4 As shown, the cusp-fovea interleaving detection includes the following steps:

[0119] The first step is to determine the lowest point Q of the lingual apex of the maxillary molar. The lowest point Q of the lingual apex of the maxillary molar refers to the characteristic point at the lingual apex of the maxillary molar that is closest to the occlusal surface of the opposing mandibular molar along the occlusal direction. The system projects Q onto the region containing the occlusal surface of the opposing mandibular molar along the normal direction of the opposing mandibular molar's occlusal surface, obtaining the projection point Q'.

[0120] The second step, during the 3D model data preparation stage, involves pre-marking the central fossa region and the marginal ridge and groove region on the occlusal surface of the mandibular molars. The system then determines whether the projection point Q' is located in the central fossa region or the marginal ridge and groove region.

[0121] Third, when the projection point Q' is located in the central fossa region or the marginal ridge groove region, calculate the shortest Euclidean distance d between the lowest point Q of the lingual cusp of the maxillary molar and the occlusal surface of the mandibular molar. When d is not greater than the contact judgment tolerance corresponding to the later fine adjustment stage, and there is no penetration between the lowest point Q of the lingual cusp of the maxillary molar and the occlusal surface of the mandibular molar, the pair of maxillary and mandibular molars are determined to meet the cusp-fossa intercuspal contact condition.

[0122] The system determines that the corresponding maxillary and mandibular molars form cusp-fossa interlocking contact only when the projection point is located in the central fossa region or the marginal ridge groove region, the shortest Euclidean distance is not greater than the contact judgment tolerance corresponding to the later fine adjustment stage, and there is no penetration between the lowest point of the lingual cusp of the maxillary molar and the occlusal surface of the opposite mandibular molar.

[0123] Furthermore, the system identifies the anterior region, left premolar region, and right premolar region as mandatory anterior occlusal zones. Mandatory anterior occlusal zones refer to the occlusal functional zones that must be satisfied for candidate archwire pairings to achieve a satisfactory fit at the current treatment stage.

[0124] When any of the required front-end partitions fails to meet the requirements, the system will determine the corresponding candidate archwire pairing as unqualified and exclude that candidate archwire pairing from the qualified pairing results of the current stage.

[0125] When all required anterior occlusal zones of a candidate archwire pair are acceptable, but at least one molar region in the currently used molar region is unacceptable, the system identifies the candidate archwire pair as pending posterior occlusal adjustment. This status indicates that the anterior occlusal relationship of the candidate archwire pair meets the anterior requirements of the current stage, but the posterior occlusal relationship does not yet meet the molar region conditions of the current stage.

[0126] When all activated occlusal functional zones in the current treatment phase are qualified, the system will determine the corresponding candidate archwire pairing as fully qualified.

[0127] In the early alignment stage, since the left and right molar regions are not used as elimination criteria for candidate archwire pairings, when the anterior, left, and right premolar regions of the same candidate archwire pairing are all qualified, the system determines the candidate archwire pairing as fully qualified across all regions.

[0128] The system output may include candidate archwire pairing identifiers, occlusal coordination status, detection results for each zone, failed zones, and failure types. Failure types may include anterior crossbite, missing premolar contact, inadequate molar cusp-fossa relationship, mesh penetration, and incomplete data.

[0129] Anterior crossbite indicates that in all superior and inferior projections of the anterior region, the lingual surfaces of the maxillary anterior teeth are located posterior to the labial surfaces of the mandibular anterior teeth. Premolar contact absence indicates that there is no combination of maxillary and mandibular premolar occlusal surfaces within the corresponding premolar region where the shortest Euclidean distance is not greater than the contact tolerance and there is no penetrating contact. Insufficient molar cusp-fossa relationship indicates that there is no combination of maxillary and mandibular molars within the molar region that satisfies the cusp-fossa intercuspal contact condition. Mesh penetration indicates that the triangular faces of the maxillary and mandibular functional surface meshes spatially overlap, and the depth of this overlap exceeds the allowable geometric error.

[0130] Furthermore, such as Figure 6 As shown, key tooth positions can be set during the occlusal functional zoning test.

[0131] The key tooth in the molar region is the first molar, the key tooth in the premolar region is the first premolar, and the key tooth in the anterior region is the canine.

[0132] When starting to detect a certain occlusal functional zone, the system first performs occlusal detection on the key teeth in that occlusal functional zone.

[0133] When the occlusal test result corresponding to a critical tooth position is unqualified, the system directly determines that the occlusal functional zone is unqualified and stops the subsequent testing of non-critical tooth positions in that zone.

[0134] When the occlusion test result corresponding to the critical tooth position is qualified, the system continues to perform occlusion test on the non-critical tooth positions in the same zone, and determines the test result of the occlusion functional zone based on the test results of the critical and non-critical tooth positions.

[0135] This approach prioritizes key teeth as the initial testing targets for their corresponding occlusal functional zones. When a key tooth fails to meet the testing conditions for its corresponding occlusal functional zone, the system halts subsequent geometric testing of non-key teeth within that zone, thereby reducing unnecessary calculations. Prioritizing key tooth testing only alters the testing order within the same zone; it does not change the occlusal functional zone division method, treatment stage parameters, or candidate archwire pairing methods.

[0136] Optionally, in one implementation, the system can pre-screen the candidate set of archwires based on the applicable treatment stages recorded in the archwire database. After reading the current treatment stage, the system filters out candidate archwires that do not match the applicable stage from the candidate set, and the remaining candidate archwires enter the pairwise pairing and occlusion detection process.

[0137] In one alternative implementation, when a candidate archwire pair lacks virtual tooth alignment transformation data corresponding to the tooth position to be tested, the system marks the candidate archwire pair as having incomplete data and does not perform subsequent occlusion testing on the candidate archwire pair.

[0138] In one optional implementation, the system sorts candidate archwire pairs under the same occlusal coordination state by contact margin. The contact margin can be determined based on the difference between the contact judgment tolerance corresponding to the current treatment stage and the shortest Euclidean distance between the maxillary and mandibular functional surface grids in the corresponding occlusal functional zones. This sorting is used to display the spatial margin between candidate archwire pairs under the same occlusal coordination state, without changing the criteria for determining whether a candidate archwire pair is acceptable or unacceptable.

[0139] In one optional implementation, the system performs dynamic stability verification on candidate archwire pairs that pass static occlusion testing. The system applies preset micro-movement distances to the virtual mandibular tooth alignment results along the patient's left side, right side, and forward extension direction. After each micro-movement distance is applied, the occlusion test for each enabled occlusion functional zone is re-executed.

[0140] like Figure 7 As shown, the three micro-motion directions are the left side, right side, and forward extension direction. The micro-motion distance for each direction can be preset according to the clinical functional range of motion. When the preset micro-motion distance is applied along the left side, right side, and forward extension direction, and all activated occlusal functional zones remain qualified, the system determines that the candidate archwire pairing is dynamically stable and qualified. If the qualified occlusal contact formed in the static test no longer meets the contact conditions under any micro-motion direction, or if penetration occurs, the candidate archwire pairing is marked as statically qualified but dynamically unstable.

[0141] In another alternative implementation, the system calculates the molar long axis tilt angle before detecting the intercuspal intersection in the molar region. The system obtains the position of the molar crown center and the position of the root apex, determines the molar long axis based on the direction from the crown center to the root apex, and calculates the angle between the molar long axis and the normal to the occlusal plane.

[0142] When the long axis of the maxillary molar deflects buccally beyond the preset buccal tilt tolerance, or the long axis of the mandibular molar deflects lingually beyond the preset lingual tilt tolerance, the system marks the corresponding molar area as having acceptable contact but abnormal tilt. This marking indicates that the spatial orientation of the corresponding molar is inconsistent with the preset tilt conditions, but does not change the basic test results obtained based on the cusp-fossa interlocking contact conditions.

[0143] Comprehensive Implementation Examples

[0144] This embodiment uses the orthodontic archwire fitting process of a patient as an example to illustrate the operation of the above system and method. The specific process is as follows:

[0145] The system acquires the patient's maxillary and mandibular 3D models and occlusion records. The maxillary and mandibular 3D models are represented by triangular meshes on the crown surfaces, with each tooth having a corresponding tooth position marker. The system then registers the maxillary and mandibular dentitions to a unified patient coordinate system based on the occlusion records.

[0146] The system retrieves candidate sets of maxillary and mandibular archwires from the archwire database. The maxillary archwire candidate set is denoted as U={u1,u2,...,um}, and the mandibular archwire candidate set is denoted as L={l1,l2,...,ln}. Each candidate maxillary archwire has a corresponding virtual maxillary tooth arrangement result, and each candidate mandibular archwire has a corresponding virtual mandibular tooth arrangement result.

[0147] The system pairs each candidate maxillary archwire with each candidate mandibular archwire, with each candidate archwire pair represented as Pij=(ui,lj). For one pair of candidate archwires, the system reads the corresponding virtual maxillary and mandibular tooth arrangement results, transforms the maxillary and mandibular dentition models, and uses the occlusal position registration transformation corresponding to the occlusal records to form the virtual maxillary and mandibular dentition corresponding to that candidate archwire pair.

[0148] When the patient is in the early alignment stage, the system activates the anterior, left premolar, and right premolar regions and applies the contact tolerance corresponding to the early alignment stage. The system performs sagittal projection detection on the anterior region and shortest Euclidean distance and penetration detection on the left and right premolar regions. If all three anterior regions are qualified, the candidate archwire pair is determined to be fully qualified across all regions, and the candidate archwire pair is output.

[0149] When the patient enters the intermediate gap-closing stage, the system re-performs the archwire pairing test, recalls the test parameters corresponding to the intermediate gap-closing stage, and activates the five occlusal functional zones. In addition to the anterior and left and right premolar zones, the system also performs occlusal contact testing on the left and right molar zones. When the left and right molar zones respectively have occlusal contacts that meet the contact judgment tolerance of the intermediate gap-closing stage and do not involve penetration, the system combines the test results from the anterior, left, and right premolar zones to determine the occlusal coordination status of the candidate archwire pairing.

[0150] When the patient enters the later fine-tuning stage, the system further tightens the contact judgment tolerance and performs a three-step cusp-fossa intercuspal contact test in the left and right molar regions. The system first projects the lowest point of the lingual cusp of the maxillary molar along the normal to the occlusal surface of the mandibular molar, obtaining a projection point Q'. It then determines whether the projection point Q' is located in the central fossa region or the marginal ridge groove region. Next, it calculates the shortest Euclidean distance between the lowest point of the lingual cusp of the maxillary molar and the occlusal surface of the mandibular molar, and checks for any penetration. When all three conditions are met, the corresponding molar combination is determined to satisfy the cusp-fossa intercuspal contact condition.

[0151] The system summarizes the test results of each activated occlusal functional zone in the current treatment phase. If any anterior mandatory zone fails, the system outputs "Coordination Failure" and the corresponding failed zone. If all anterior mandatory zones pass but any activated molar zone fails, the system outputs "Posterior Coordination Needs Adjustment." If all activated occlusal functional zones pass, the system outputs "All Zones Coordination Pass."

[0152] For the critical tooth position priority testing method, the system can first test the first molar, first premolar, or canine at the beginning of each zone. If a critical tooth position fails, the system stops testing non-critical tooth positions within that zone and directly outputs that the zone is unqualified. When the critical tooth position passes, the system continues testing non-critical tooth positions.

[0153] For candidate archwires that pass the static testing, the system can also... Figure 7 The three directions shown apply preset micro-movement distances to the virtual mandibular tooth alignment results, and the detection of each enabled occlusal functional zone is re-executed. When all directions are qualified, the output is dynamically stable and qualified; when contact point loss or penetration occurs in any direction, the output is statically qualified but dynamically unstable.

[0154] Through the above implementation process, the system uses the virtual maxillary and mandibular dentition formed by pairing candidate maxillary and mandibular archwires as the detection object, and calls the corresponding occlusal functional zones and occlusal detection conditions according to the current treatment stage. The output results include candidate archwire pairings and the detection results of each zone, so that the screening results of candidate archwire pairings correspond to the occlusal requirements of the current treatment stage.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage adaptive selection method for orthodontic archwires, characterized in that, Includes the following steps: A three-dimensional model of the maxillary dentition, a three-dimensional model of the mandibular dentition, an occlusal record, a candidate set of maxillary archwires, and a candidate set of mandibular archwires are obtained. Each candidate maxillary archwire in the candidate set of maxillary archwires and each candidate mandibular archwire in the candidate set of mandibular archwires has a corresponding virtual tooth arrangement result. The virtual tooth arrangement result represents the expected three-dimensional position and posture of each tooth after the corresponding candidate archwire is applied. The candidate archwires in the maxillary archwire candidate set and the candidate archwires in the mandibular archwire candidate set are paired up to obtain multiple candidate archwire pairs; For each candidate archwire pairing, the three-dimensional models of the maxillary and mandibular dentitions are transformed according to the virtual tooth arrangement results corresponding to the candidate archwire pairing. Based on the occlusion record, the transformed three-dimensional models of the maxillary and mandibular dentitions are spatially registered to the same occlusal position relationship to form a virtual maxillary and mandibular dentitions in a unified coordinate system. The detection parameters are determined based on the current treatment stage. The detection parameters include the activation status of multiple occlusal functional zones and the occlusal detection conditions corresponding to each activated occlusal functional zone. The multiple occlusal functional zones are detection areas pre-divided according to tooth position and the occlusal function undertaken by the tooth position. The occlusal detection conditions include at least the contact judgment tolerance. According to the occlusal testing conditions corresponding to each activated occlusal functional zone, occlusal testing is performed on each activated occlusal functional zone of the virtual maxillary and mandibular dentition to obtain the testing results for each activated occlusal functional zone; and, Based on the detection results of each enabled occlusal functional zone, the occlusal coordination status of the candidate archwire pairings is determined, and candidate archwire pairings that meet the occlusal detection conditions of each enabled occlusal functional zone corresponding to the current treatment stage are screened and output.

2. The method according to claim 1, characterized in that, The multiple occlusal functional zones include the anterior tooth zone, the left premolar zone, the right premolar zone, the left molar zone, and the right molar zone; The tooth position numbering adopts the FDI two-digit tooth position numbering method. The anterior tooth region includes the incisal edge and lingual surface of maxillary teeth 13 to 23, and the labial surface of mandibular teeth 33 to 43 opposite to the lingual surface. The left premolar region includes the occlusal surfaces of teeth 24, 25, 34, and 35. The right premolar region includes the occlusal surfaces of teeth 14, 15, 44, and 45. The left molar region includes the occlusal surfaces of teeth 26, 27, 36, and 37. The right molar region includes the occlusal surfaces of teeth 16, 17, 46, and 47. Each occlusal functional zone establishes a correspondence with the corresponding tooth position object through tooth position identifiers, and changes synchronously with the change of the corresponding tooth position object; among them, each occlusal functional zone is divided based on the corresponding tooth position, and when a tooth position does not exist, that tooth position does not participate in the occlusal detection of the corresponding zone.

3. The method according to claim 2, characterized in that, Performing occlusion testing on any occlusion function zone that has been enabled includes: Obtain the maxillary and mandibular functional surface meshes in the enabled occlusal functional zone; Calculate the shortest Euclidean distance between the maxillary functional surface mesh and the mandibular functional surface mesh; When the shortest Euclidean distance is not greater than the contact judgment tolerance corresponding to the current treatment stage, and there is no penetration between the maxillary functional surface grid and the mandibular functional surface grid, it is determined that the maxillary functional surface grid and the mandibular functional surface grid form a qualified occlusal contact; wherein, the penetration refers to the spatial overlap of the triangular faces of the maxillary functional surface grid and the mandibular functional surface grid, and the depth of the spatial overlap is greater than the preset allowable geometric error; If the penetration occurs within the occlusal functional area, the occlusal functional area is determined to be unqualified, and the determination of the penetration takes precedence over the determination of the qualified occlusal contact.

4. The method according to claim 3, characterized in that, The current treatment phase includes the early alignment phase, the intermediate gap closure phase, and the later fine adjustment phase. In the early alignment stage, the anterior region, left premolar region, and right premolar region are used, and the test results of the left and right molar regions are not used as the elimination criteria for candidate archwire matching. During the intermediate gap closure stage, the multiple occlusal functional zones are activated, and it is required that there is at least one pair of maxillary molar occlusal surfaces and mandibular molar occlusal surfaces in the left molar region and the right molar region, respectively. The shortest Euclidean distance between the pair of maxillary molar occlusal surfaces and mandibular molar occlusal surfaces is not greater than the contact judgment tolerance corresponding to the intermediate gap closure stage, and there is no penetration. In the later fine-tuning stage, the multiple occlusal functional zones are activated, and it is required that there is at least one combination of maxillary molars and mandibular molars in the left molar zone and the right molar zone respectively to meet the cusp-fossa intercuspal contact condition. Among them, the contact judgment tolerance corresponding to the early alignment stage is greater than the contact judgment tolerance corresponding to the mid-term gap closing stage, and the contact judgment tolerance corresponding to the mid-term gap closing stage is greater than the contact judgment tolerance corresponding to the late-term fine adjustment stage.

5. The method according to claim 3, characterized in that, The occlusal detection of the anterior teeth region includes: In the unified coordinate system, the sampling surfaces of the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth are projected onto the sagittal plane formed by the anterior-posterior direction and the superior-inferior direction; Within the overlapping area of ​​the sampling surface projection in the vertical direction, the relative positions of the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth in the anterior-posterior direction are determined for each vertical projection position. When the lingual surface of the maxillary anterior teeth is located behind the labial surface of the mandibular anterior teeth at all vertical projection positions within the overlapping area, anterior crossbite is determined to exist. The anterior tooth region is deemed qualified if there is no penetration within the anterior tooth region and any of the following conditions are met: (i) at at least one vertical projection position, the lingual surface of the maxillary anterior teeth is located in front of the labial surface of the mandibular anterior teeth; or (ii) in the absence of anterior crossbite, the shortest Euclidean distance between the lingual surface of the maxillary anterior teeth and the labial surface of the mandibular anterior teeth is not greater than the contact determination tolerance.

6. The method according to claim 4, characterized in that, The alternating contact conditions of the cusps and dimples are determined in the following manner: The lowest point of the lingual tip of the maxillary molar is projected along the normal of the occlusal surface of the relative mandibular molar to the region where the occlusal surface of the relative mandibular molar is located, and the projection point is obtained. The lowest point of the lingual tip of the maxillary molar is the feature point of the lingual tip of the maxillary molar that is closest to the occlusal surface of the relative mandibular molar along the occlusal direction. Determine whether the projection point is located within the central fossa region or marginal ridge groove region pre-marked during the 3D model data preparation stage of the relative mandibular molar; and, When the projection point is located in the central fossa region or the marginal ridge groove region, calculate the shortest Euclidean distance between the lowest point of the lingual tip of the maxillary molar and the occlusal surface of the opposite mandibular molar; When the shortest Euclidean distance is not greater than the contact judgment tolerance corresponding to the later fine adjustment stage, and there is no penetration between the lowest point of the lingual cusp of the maxillary molar and the occlusal surface of the opposite mandibular molar, the pair of maxillary and mandibular molars are determined to meet the cusp-fossa interlocking contact condition.

7. The method according to claim 4, characterized in that, The determination of the occlusal coordination state of candidate archwire pairings includes: The anterior tooth region, left premolar region, and right premolar region are defined as the necessary anterior segment regions. These necessary anterior segment regions are the occlusal function regions that must be satisfied for candidate archwire pairing to obtain a qualified fitting result in the current treatment stage. If any of the necessary front section sections fails to meet the requirements, the corresponding candidate archwire pairing will be determined as a failure to meet the requirements for coordination. If all necessary anterior segments are qualified and any activated molar area is unqualified, the corresponding candidate archwire pair will be identified as the posterior segment to be adjusted. When all activated occlusal functional zones are qualified in the current treatment phase, the corresponding candidate archwire pairing will be determined as fully qualified in all zones. In the early alignment stage, if the anterior tooth region, left premolar region and right premolar region are all qualified, the corresponding candidate archwire pairing will be determined as the full-area collaborative qualification. The output includes the failed occlusal functional zones and failure types corresponding to the candidate archwire pairings that failed to meet the requirements. The failure types include: anterior crossbite, i.e., in all the vertical projection positions of the anterior region, the lingual surface of the maxillary anterior teeth is located behind the labial surface of the mandibular anterior teeth; premolar contact absence, i.e., there is no combination of maxillary and mandibular premolar occlusal surfaces in the corresponding premolar region that simultaneously meets the following conditions: the shortest Euclidean distance is not greater than the contact judgment tolerance, and there is no penetration; molar cusp-fossa relationship is not satisfied, i.e., there is no combination of maxillary and mandibular molars in the molar region that meets the cusp-fossa interlocking contact condition; and mesh penetration, i.e., the triangular faces of the maxillary functional surface mesh and the mandibular functional surface mesh overlap spatially, and the depth of the spatial overlap is greater than the preset allowable geometric error.

8. The method according to claim 3, characterized in that, Key tooth positions are preset for each occlusal functional zone. The key tooth position for the molar zone is the first molar, the key tooth position for the premolar zone is the first premolar, and the key tooth position for the anterior zone is the canine. When performing occlusion testing on any occlusion functional zone, first perform occlusion testing on the maxillary functional surface grid and mandibular functional surface grid corresponding to the key tooth positions in that occlusion functional zone. If the occlusal test result corresponding to the critical tooth position is unqualified, the occlusal functional area is directly judged as unqualified and the occlusal test of the non-critical tooth positions in the occlusal functional area is stopped. If the occlusal test results corresponding to the critical tooth positions are qualified, continue to perform occlusal tests on the non-critical tooth positions within the occlusal functional zone, and determine the test results of the occlusal functional zone based on the occlusal test results of the critical and non-critical tooth positions.

9. A multi-stage adaptive fitting system for orthodontic archwires, characterized in that, include: The candidate data acquisition module is used to acquire the three-dimensional model of the maxillary dentition, the three-dimensional model of the mandibular dentition, occlusion records, the candidate set of maxillary archwires, and the candidate set of mandibular archwires; among them, each candidate archwire is associated with a virtual tooth arrangement result that characterizes the expected three-dimensional position and posture of each tooth. The occlusal contact zone mapping module is used to divide the three-dimensional models of the maxillary and mandibular dentition into multiple occlusal functional zones according to the tooth position and the occlusal function undertaken by the tooth position, and to establish the correspondence between each occlusal functional zone and the corresponding tooth position object. The archwire pairing module is used to pair candidate archwires in the maxillary archwire candidate set and the mandibular archwire candidate set to obtain multiple candidate archwire pairs; The virtual dentition construction module is used to transform the three-dimensional models of the maxillary and mandibular dentitions according to the virtual tooth arrangement results corresponding to each candidate archwire pair, and to spatially register the transformed three-dimensional models of the maxillary and mandibular dentitions to the same occlusal position relationship according to the occlusal record, thereby forming a virtual maxillary and mandibular dentitions. The stage parameter configuration module is used to determine the detection parameters according to the current treatment stage. The detection parameters include the activation status of each occlusal functional zone and the occlusal detection conditions corresponding to each activated occlusal functional zone. The occlusal detection conditions include at least the contact judgment tolerance. The occlusal detection module is used to perform occlusal detection on each enabled occlusal functional zone of the virtual maxillary and mandibular dentition according to the occlusal detection conditions corresponding to each enabled occlusal functional zone, and obtain the occlusal detection results; and, The collaborative determination output module is used to determine the occlusal collaboration status of candidate archwire pairings based on the partition detection results, and to screen and output candidate archwire pairings that meet the occlusal detection conditions of each enabled occlusal functional partition corresponding to the current treatment stage.

10. The orthodontic archwire multi-stage adaptive fitting system according to claim 9, characterized in that, The multiple occlusal functional zones include the anterior tooth zone, the left premolar zone, the right premolar zone, the left molar zone, and the right molar zone; the current treatment stage includes the early alignment stage, the intermediate gap closing stage, and the late fine adjustment stage; The stage parameter configuration module is set as follows: in the early alignment stage, the anterior tooth area, the left premolar area, and the right premolar area are enabled and the detection results of the molar area are not used as the elimination condition; in the mid-stage gap closing stage, all occlusal functional zones are enabled and the molar area is required to have occlusal contact; in the late fine adjustment stage, all occlusal functional zones are enabled and the molar area is required to meet the cusp-fossa intercuspal contact condition. Among them, the contact judgment tolerances for the early alignment stage, the mid-term gap closing stage, and the late fine adjustment stage decrease sequentially.

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