Mandibular canine bracket for skeletal class iii dento-maxillofacial deformity and design method and equipment thereof

Abstract

The application provides a mandibular canine orthodontic bracket for skeletal class III dental and maxillofacial deformity and a design method and equipment thereof, wherein the method for selecting parameters of the mandibular canine orthodontic bracket for skeletal class III dental and maxillofacial deformity comprises the following steps: acquiring craniofacial image information of a patient; obtaining a mandibular canine torque angle and anatomic structure information related to mandibular canine compensation evaluation according to the craniofacial image information, wherein the anatomic structure information comprises an ANB angle, the mandibular canine torque angle and a mandibular canine bone fenestration / cleft degree; obtaining a scoring result of the mandibular canine according to a preset mandibular canine compensation index evaluation standard according to the anatomic structure information; and determining a torque and an axial inclination of the mandibular canine bracket according to the scoring result and the mandibular canine torque angle, respectively.

Description

Technical Field

[0001] This invention relates to the field of orthognathic orthodontics, specifically to a mandibular canine orthodontic bracket for skeletal Class III dental and maxillofacial deformities, and its design method and equipment. Background Technology

[0002] For patients with malocclusion, orthodontic treatment involves bonding orthodontic brackets / buccal tubes to the center of the clinical crown of the teeth. Orthodontic archwires are then fixed within the grooves of the brackets / buccal tubes. The rebound force of the archwires, transmitted through the brackets / buccal tubes, moves the teeth, gradually aligning them. By setting different torques and axial tilts within the grooves of the orthodontic brackets / buccal tubes, varying degrees of buccal-lingual and mesio-distal movement of the teeth can be achieved.

[0003] Orthodontic brackets / buccal tubes are categorized based on tooth position, including brackets for incisors, canines, premolars, and buccal tubes for molars, each with different numerical designs. Current orthodontic brackets / buccal tubes are primarily designed for malocclusion patients with normal jawbone structures. However, their application to patients with skeletal deformities, especially Class III skeletal dentofacial deformities, has certain limitations.

[0004] Therefore, the existing technology lacks a standardized system for orthodontic brackets / buccal tubes used for skeletal Class III dentofacial deformities and an automated scheme for their numerical design. Summary of the Invention

[0005] The purpose of this invention is to provide a standardized bracket / buccal tube system for craniofacial orthodontic brackets / buccal tubes used for skeletal Class III dentofacial deformities, and to automatically and efficiently complete the numerical design of the above-mentioned orthodontic brackets by combining existing computer technology.

[0006] I. For orthodontic brackets for incisors in cases of skeletal Class III dentofacial deformities, the present invention provides the following technical solution:

[0007] This invention provides a method for designing parameters for incisor orthodontic brackets for skeletal Class III dental and maxillofacial deformities, the method comprising:

[0008] Obtain the patient's craniofacial images;

[0009] Based on the craniofacial image information, anatomical information related to incisor compensation assessment is obtained. The anatomical information includes maxillary incisor angle UI-SN, mandibular incisor angle LI-MP, maxillary incisor projection distance UI-NA, mandibular incisor projection distance LI-NB, maxillary bone position SNA, and mandibular bone position SNB.

[0010] The scoring results of the maxillary and mandibular incisors were obtained based on the anatomical information using a preset incisor compensation index assessment standard.

[0011] The torque of the upper and lower incisor brackets is determined based on the scoring results.

[0012] Furthermore, the incisor compensation index assessment criteria for maxillary incisors include:

[0013] (1) Maxillary incisor angle UI-SN: UI-SN < 100° is rated as -2 points, 100° ≤ UI-SN < 110° is rated as 0 points, 110° ≤ UI-SN < 115° is rated as 2 points, 115° ≤ UI-SN < 120° is rated as 3 points, and UI-SN ≥ 120° is rated as 4 points;

[0014] (2) Maxillary incisor protrusion distance UI-NA: UI-NA < 3mm is rated as -1 point, 3mm ≤ UI-NA < 7mm is rated as 0 points, and UI-NA ≥ 7mm is rated as 1 point;

[0015] (3) Maxillary position SNA: SNA≥87° is rated as -1 point, 79°≤SNA<87° is rated as 0 points, and SNA<79° is rated as 1 point.

[0016] Further, determining the torque of the maxillary incisor bracket based on the scoring results includes:

[0017] (1) When the total score of the maxillary incisor compensation index is <2, the torque of the maxillary central incisor bracket should be 17° and the torque of the maxillary lateral incisor bracket should be 10°.

[0018] (2) When 2≤Total score of maxillary incisor compensation index≤3, the torque of the maxillary central incisor bracket is selected as 12°, and the torque of the maxillary lateral incisor bracket is selected as 6°.

[0019] (3) When the total score of the maxillary incisor compensation index is ≥4, the torque of the maxillary central incisor bracket should be 7° and the torque of the maxillary lateral incisor bracket should be 2°.

[0020] Furthermore, the incisor compensation index assessment criteria for mandibular incisors include:

[0021] (1) Mandibular incisor angle LI-MP: LI-MP≥100° is rated as -2 points, 85°≤LI-MP<100° is rated as 0 points, 75°≤LI-MP<85° is rated as 2 points, 70°≤LI-MP<75° is rated as 3 points, and LI-MP<70° is rated as 4 points;

[0022] (2) Mandibular incisor convexity distance LI-NB: LI-NB < 4mm is rated as -1 point, 4mm ≤ LI-NB < 8mm is rated as 0 points, and LI-NB ≥ 8mm is rated as 1 point;

[0023] (3) Mandibular position SNB: SNB < 76° is rated as -1 point, 76° ≤ SNB < 84° is rated as 0 points, and SNB ≥ 84° is rated as 1 point.

[0024] Further, determining the torque of the mandibular incisor bracket based on the scoring results includes:

[0025] (1) When the total score of the mandibular incisor compensation index is <2, the torque of the mandibular incisor bracket should be -6°;

[0026] (2) When 2≤total score of mandibular incisor compensation index≤3, the torque of mandibular incisor bracket should be -1°;

[0027] (3) When the total score of the mandibular incisor compensation index is 4, the torque of the mandibular incisor bracket should be 4°.

[0028] (4) When the total score of the mandibular incisor compensation index is >4, the torque of the mandibular incisor bracket should be 7°.

[0029] Furthermore, a neural network model is pre-trained to identify anatomical structures related to the anatomical structure information based on the craniofacial image information.

[0030] II. For orthodontic brackets for maxillary canines in cases of skeletal Class III dentofacial deformities, the present invention provides the following technical solution:

[0031] This invention provides a method for designing parameters for maxillary canine orthodontic brackets for skeletal Class III dentofacial deformities, the method comprising:

[0032] Obtain the patient's craniofacial images;

[0033] The maxillary canine axis inclination angle is obtained based on the craniofacial image information;

[0034] The maxillary canine axis inclination and maxillary extraction plan are used to obtain the maxillary canine scoring results using a preset maxillary canine compensation index assessment standard.

[0035] The axial tilt of the maxillary canine bracket is determined based on the scoring results.

[0036] Furthermore, the assessment criteria for the maxillary canine compensation index include:

[0037] (1) Maxillary canine axis inclination: Maxillary canine axis inclination > 10° is rated as -1 point, 6° < maxillary canine axis inclination ≤ 10° is rated as 0 points, 6° ≤ maxillary canine axis inclination < 2° is rated as 1 point, and maxillary canine axis inclination ≤ 2° is rated as 2 points;

[0038] (2) Maxillary extraction plan: If the maxillary extraction plan is non-reduction treatment, it is rated as 0 points; if the maxillary extraction plan is reduction of the maxillary bilateral second premolars, it is rated as 1 point; if the treatment plan is reduction of the maxillary bilateral first premolars, it is rated as 3 points.

[0039] Further, determining the axial inclination of the maxillary canine bracket based on the scoring results includes:

[0040] (1) When the total score of the maxillary canine compensation index is ≤0, the axial inclination of the maxillary canine bracket should be 8°;

[0041] (2) When 1≤total score of maxillary canine compensation index≤2, the axial inclination of the maxillary canine bracket should be 10°;

[0042] (3) When the total score of the maxillary canine compensation index is ≥3, the axial inclination of the maxillary canine bracket should be 12°.

[0043] III. For orthodontic brackets for mandibular canines in cases of skeletal Class III dentofacial deformities, the present invention provides the following technical solution:

[0044] This invention provides a method for designing parameters for mandibular canine orthodontic brackets for skeletal Class III dentofacial deformities, the method comprising:

[0045] Obtain the patient's craniofacial images;

[0046] The mandibular canine axis inclination angle and the anatomical information related to mandibular canine compensation assessment are obtained based on the craniofacial image information. The anatomical information includes the ANB angle, mandibular canine torque angle and degree of mandibular canine bone fenestration / bone splitting.

[0047] The scoring results of the mandibular canines are obtained based on the anatomical information using a preset mandibular canine compensation index assessment standard.

[0048] The torque and axial tilt of the mandibular canine bracket are determined based on the scoring results and the mandibular canine axial tilt angle, respectively.

[0049] Furthermore, the assessment criteria for the mandibular canine compensation index include:

[0050] (1) ANB angle: ANB angle > 0° is rated as -1 point, -2° ≤ ANB angle ≤ 0° is rated as 0 points, and ANB angle < -2° is rated as 1 point;

[0051] (2) Mandibular canine torque angle: Mandibular canine torque angle ≥ -2° is rated as -2 points, -2° < Mandibular canine torque angle ≤ -10° is rated as 0 points, -14° < Mandibular canine torque angle < -10° is rated as 2 points, and Mandibular canine torque angle ≤ -14° is rated as 4 points;

[0052] (3) Degree of bone fenestration / bone splitting in mandibular canine: 2 points are awarded if bone fenestration / bone splitting degree ≤ 1 / 3 of root length, 3 points are awarded if root length 1 / 3 < bone fenestration / bone splitting degree ≤ 1 / 2 of root length, 4 points are awarded if bone fenestration / bone splitting degree > 1 / 2 of root length, and 0 points are awarded if there is no bone fenestration / bone splitting.

[0053] Further, determining the torque of the mandibular canine bracket based on the scoring results includes:

[0054] (1) When the total score of the mandibular canine compensation index is <2, the torque of the mandibular canine bracket should be -6°;

[0055] (2) When 2≤total score of mandibular canine compensation index≤5, the torque of mandibular canine bracket should be -1°;

[0056] (3) When the total score of the mandibular canine compensation index is >5, the torque of the mandibular canine bracket should be 4°.

[0057] Further, determining the axial inclination of the mandibular canine bracket based on the mandibular canine axial inclination angle includes:

[0058] (1) When the axial inclination angle of the mandibular canine is ≥0°, the axial inclination of the mandibular canine bracket should be 3°;

[0059] (2) When -4°≤ mandibular canine axial inclination <0°, the axial inclination of the mandibular canine bracket should be 6°;

[0060] (3) When the axial inclination of the mandibular canine is < -4°, the axial inclination of the mandibular canine bracket should be 9°.

[0061] IV. For buccal tube orthodontic treatment of molars in skeletal Class III dentofacial deformities, the present invention provides the following technical solution:

[0062] This invention provides a method for designing parameters for the buccal tube in molar orthodontics for skeletal Class III dentofacial deformities, the method comprising:

[0063] Obtain the patient's craniofacial images;

[0064] Based on the craniofacial image information, anatomical information related to molar compensation assessment is obtained, including molar torque angle and width of maxillary and mandibular basal bones.

[0065] The scoring results of the upper and lower molars are obtained based on the anatomical information using a preset molar compensation index assessment standard.

[0066] The torque and base plate thickness of the buccal tubes of the maxillary and mandibular molars are determined based on the scoring results and the width of the maxillary and mandibular basal bones, respectively.

[0067] Furthermore, the assessment criteria for the molar compensation index, specifically for the maxillary molars, include:

[0068] (1) Torque angle of maxillary molar: The torque angle of maxillary molar ≤ -18° is rated as -2 points, -18° < maxillary molar torque angle ≤ -12° is rated as 0 points, -12° < maxillary molar torque angle ≤ -8° is rated as 2 points, and the torque angle of maxillary molar > -8° is rated as 4 points;

[0069] (2) Difference in width of the upper and lower jaw bases: A difference in width of the upper and lower jaw bases < -2.5mm is rated as -2 points, -2.5mm ≤ difference in width of the upper and lower jaw bases ≤ 1.5mm is rated as 0 points, and a difference in width of the upper and lower jaw bases > 1.5mm is rated as 2 points.

[0070] Further, the torque of the buccal tube of the maxillary molar is determined based on the scoring results, including:

[0071] (1) When the total score of the compensation index of the maxillary molar is ≤0, the torque of the buccal tube of the maxillary molar is selected as -14°;

[0072] (2) When the total score of the maxillary molar compensation index is 2, the torque of the buccal tube of the maxillary molar is selected as -19°.

[0073] (3) When the total score of the maxillary molar compensation index is ≥4, the torque of the maxillary molar buccal tube is selected as -24°.

[0074] Further, determining the base plate thickness of the maxillary molar buccal canal based on the width of the maxillary and mandibular basal bones includes:

[0075] (1) When the difference between the widths of the maxillary and mandibular base bones is ≥-2.5mm and ≤1.5mm, the thickness of the base plate of the buccal tube of the maxillary molar is selected as 0.7mm;

[0076] (2) When the difference between the widths of the maxillary and mandibular base bones is less than -2.5 mm, the thickness of the base plate of the buccal tube of the maxillary molar should be 0.4 mm.

[0077] (3) When the difference between the width of the maxillary and mandibular base bones is greater than 1.5 mm, the thickness of the base plate of the buccal tube of the maxillary molar is selected as 1.2 mm.

[0078] Furthermore, the assessment criteria for the mandibular molars in the aforementioned molar compensation index assessment criteria include:

[0079] (1) Torque angle of mandibular first molar: The torque angle of mandibular first molar > -16° is rated as -2 points, -24° < mandibular first molar torque angle ≤ -16° is rated as 0 points, -28° < mandibular first molar torque angle ≤ -24° is rated as 2 points, and the torque angle of mandibular first molar ≤ -28° is rated as 4 points;

[0080] (2) Torque angle of mandibular second molar: The mandibular second molar torque angle > -6° is rated as -2 points, -14° < mandibular second molar torque angle ≤ -6° is rated as 0 points, -18° < mandibular second molar torque angle ≤ -14° is rated as 2 points, and mandibular second molar torque angle ≤ -18° is rated as 4 points;

[0081] (3) Difference in width of the upper and lower jaw bases: A difference in width of the upper and lower jaw bases < -2.5mm is rated as -2 points, -2.5mm ≤ difference in width of the upper and lower jaw bases ≤ 1.5mm is rated as 0 points, and a difference in width of the upper and lower jaw bases > 1.5mm is rated as 2 points.

[0082] Further, the torque of the buccal canal of the mandibular molar is determined based on the scoring results, including:

[0083] (1) When the total score of the compensation index of the mandibular first molar is ≤0, the torque of the buccal tube of the mandibular first molar is selected as -20°;

[0084] (2) When the total score of the compensation index of the mandibular first molar is 2, the torque of the buccal tube of the mandibular first molar is selected as -15°.

[0085] (3) When the total score of the compensation index of the mandibular first molar is ≥4, the torque of the buccal tube of the mandibular first molar is selected as -10°.

[0086] (4) When the total score of the compensation index of the mandibular second molar is ≤0, the torque of the buccal tube of the mandibular second molar is selected as -10°;

[0087] (5) When the total score of the compensation index of the mandibular second molar is 2, the torque of the buccal tube of the mandibular second molar is selected as -5°;

[0088] (6) When the total score of the compensation index of the mandibular second molar is ≥4, the torque of the buccal tube of the mandibular second molar is selected as 0°.

[0089] Further, determining the base plate thickness of the buccal canal of the mandibular molar based on the width of the maxillary and mandibular basal bones includes:

[0090] (1) When the difference between the width of the maxillary and mandibular base bones is ≥-2.5mm or ≤1.5mm, the thickness of the base plate of the buccal tube of the mandibular molar is selected as 0.55mm;

[0091] (2) When the difference between the widths of the maxillary and mandibular base bones is less than -2.5 mm, the thickness of the base plate of the buccal tube of the mandibular molar should be 1.05 mm.

[0092] (3) When the difference between the width of the upper and lower jawbone is greater than 1.5 mm, the thickness of the base plate of the buccal tube of the mandibular molar is selected as 0.3 mm.

[0093] Based on the above-mentioned orthodontic bracket / buccal tube related technical solutions for incisors, maxillary canines, mandibular canines and molars for skeletal Class III dentofacial deformities, the present invention also provides a method for generating digital models of orthodontic brackets / buccal tubes for skeletal Class III dentofacial deformities. The method includes one or more of the above-mentioned methods for parameter design of each orthodontic bracket / buccal tube for skeletal Class III dentofacial deformities.

[0094] The present invention also provides an orthodontic bracket / buccal tube for skeletal Class III dentofacial deformities, wherein the orthodontic bracket / buccal tube is made using a model obtained by the above-described digital model generation method.

[0095] This invention also provides a device for parameter design of orthodontic brackets / buccal tubes for skeletal Class III dental and maxillofacial deformities, the device comprising:

[0096] Processor; and

[0097] A memory is configured to store computer-executable instructions, which, when executed, cause the processor to perform one or more of the above-described methods for parameter design of various orthodontic brackets / buccal tubes for skeletal Class III dentofacial deformities.

[0098] The present invention also provides a computer-readable medium storing instructions that, when executed, cause the system to perform one or more of the operations described above in the method for parameter design of various orthodontic brackets / buccal tubes for skeletal Class III dentofacial deformities.

[0099] The technical solution of the present invention has the following technical effects:

[0100] 1. The incisor bracket based on the present invention is suitable for orthodontic treatment before and after orthognathic surgery for patients with skeletal Class III dentofacial deformities of different severity. It makes the labially inclined upper incisors and the lingually inclined lower incisors upright in the alveolar bone, achieving complete orthodontic decompensation, increasing the anterior overbite of patients with skeletal Class III dentofacial deformities, and creating space for jawbone movement during orthognathic surgery.

[0101] 2. The maxillary canine bracket based on the present invention is applicable to patients with skeletal Class III dentofacial deformities of varying severity. It is bonded to the patient's maxillary canine at the beginning of treatment. The additional axial inclination in the bracket can effectively achieve preoperative orthodontic alignment and decompensation of the maxillary canine. For maxillary canines with different movement ranges, it avoids unintended tilting, effectively achieves orthodontic root control movement, and better creates stable occlusal support for orthognathic surgery.

[0102] 3. The mandibular canine bracket based on the present invention can be applied to patients with skeletal Class III dentofacial deformities of varying severity. It is bonded to the patient's mandibular canine at the beginning of treatment. The different additional torques and axial inclinations set in the bracket can effectively achieve preoperative orthodontic alignment and decompensation of the mandibular canine, straightening the mandibular canine that was originally excessively lingually tilted and distally tilted to a normal angle, and moving the tooth roots that have the risk of bone fenestration / bone fracture into the alveolar bone, which is beneficial to periodontal health and creates a more stable occlusal support for orthognathic surgery.

[0103] 4. The buccal tube of the present invention can be applied to patients with skeletal Class III dentofacial deformities with varying degrees of molar width discrepancies. It is bonded to the patient's upper and lower molars at the beginning of treatment. The different additional torques and base plate thicknesses of the buccal tube can effectively achieve preoperative orthodontic molar alignment and decompensation, straighten the molars that were originally excessively tilted buccally and lingually to a normal angle, reduce the maxillary arch and expand the mandibular arch, and achieve matching of the width of the upper and lower dental arches.

[0104] 5. The standardized orthodontic bracket / buccal tube system for patients with skeletal Class III maxillofacial deformities fills a gap in the prior art. The method based on the present invention can automatically determine the corresponding key parameters of the standardized orthodontic bracket / buccal tube for patients with skeletal Class III maxillofacial deformities, which greatly reduces the time spent on numerical design of brackets / buccal tubes.

[0105] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0106] Figure 1 This is a flowchart illustrating the parameter design of an incisor orthodontic bracket for skeletal Class III maxillofacial deformities according to an embodiment of the present invention;

[0107] Figure 2 This is a flowchart illustrating the parameter design of a maxillary canine orthodontic bracket for skeletal Class III dental maxillofacial deformity according to an embodiment of the present invention.

[0108] Figure 3 This is a flowchart illustrating the parameter design of a mandibular canine orthodontic bracket for skeletal Class III maxillofacial deformities, according to an embodiment of the present invention.

[0109] Figure 4 This is a flowchart illustrating the parameter design of a molar orthodontic buccal tube for skeletal Class III dental maxillofacial deformities, according to an embodiment of the present invention.

[0110] Figure 5 This is a schematic diagram of the anatomical structure of the cephalometric measurement project in Embodiment 1 of the present invention;

[0111] Figure 6This is another anatomical diagram of the cephalometric measurement project in Embodiment 1 of the present invention;

[0112] Figure 7 This is a schematic diagram of the axial tilt angles of the upper and lower canines;

[0113] Figure 8 This is a schematic diagram of the torque angles of the upper and lower incisors;

[0114] Figure 9 These are schematic diagrams of labial bone fenestration / bone fissure at the root of the mandibular canine in different three-dimensional dental arch models;

[0115] Figure 10 This is a schematic diagram of the anatomical structure of the cephalometric measurement project in Embodiment 3 of the present invention;

[0116] Figure 11 The location of the width measurement of the maxillary and mandibular basilar bones is shown in a CBCT image;

[0117] Figure 12 The illustration shows functional modules of an exemplary system that can be used in various embodiments or combinations of embodiments of the present invention. Detailed Implementation

[0118] In the description of the embodiments of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The accompanying drawings are schematic diagrams or conceptual diagrams, and the relationships between the thickness and width of each part, as well as the proportional relationships between each part, etc., are not entirely consistent with their actual values.

[0119] Example 1

[0120] Given that conventional orthodontic incisor brackets cannot completely align the severely tilted upper and lower incisors of patients with skeletal deformities, and the incisors still exhibit compensatory buccal-lingual tilt, this will affect the amount of movement of the maxilla and mandible during orthognathic surgery, leading to incomplete surgical treatment. Therefore, the technical solution of this embodiment comprehensively considers the position of the maxilla, mandible, and incisors in patients with skeletal Class III dentofacial deformities, and provides an adaptive design for incisor orthodontic brackets specifically for skeletal Class III dentofacial deformities.

[0121] Specifically, such as Figure 1 As shown in this embodiment, the method for designing parameters of incisor orthodontic brackets for skeletal Class III dentofacial deformities includes:

[0122] Step 1: Obtain the patient's craniofacial image information.

[0123] The craniofacial image information in this step includes images of the patient's skull, jawbone, and dental arch. These images can usually be obtained through CBCT or X-ray.

[0124] Step 2: Obtain anatomical information related to incisor compensation assessment based on craniofacial images. Anatomical information includes maxillary incisor angle UI-SN, mandibular incisor angle LI-MP, maxillary incisor projection distance UI-NA, mandibular incisor projection distance LI-NB, maxillary bone position SNA, and mandibular bone position SNB.

[0125] The anatomical information in this step comes from cephalometric measurements, for reference. Figure 5 and Figure 6 The specific anatomical structures involved include:

[0126] Sella point (S): The center of the sella image.

[0127] Nasal root point (N): The foremost point of the nasofrontal suture, a landmark of the anterior cranial region, representing the junction of the face and skull.

[0128] Subspinale (A): The most concave point of bone between the anterior nasal spine and the margin of the superior alveolar ridge.

[0129] Upper incisor (UI): The anterior point of the incisal edge of the maxillary central incisor. Connecting this point to the apex of the root forms a plane for measuring the long axis of the maxillary central incisor.

[0130] Supramental (B): The most concave point of bone between the point of the inferior alveolar process and the point of the anterior chin.

[0131] The lower incisor (LI) is the anterior point of the incisal edge of the mandibular central incisor. Connecting this point to the apex of the root forms the long axis of the mandibular central incisor, serving as a plane for angular measurement.

[0132] Menton (Me): The lowest point of the chin.

[0133] The Sella-Nasion Plane (SN) is formed by the line connecting the sella turcica (S) and the root of the nose (N). It represents the anterior and posterior extent of the anterior cranial base in the sagittal plane of the skull.

[0134] Mandibular plane (MP): A line passing through the submental point Me and tangent to the lower edge of the mandibular angle.

[0135] Figure 5 and Figure 6 For items involving angles, such as the maxillary incisor angle UI-SN, mandibular incisor angle LI-MP, maxillary position SNA, and mandibular position SNB, a triangle with color fill is set at the corresponding intersection to indicate the angle.

[0136] In some embodiments, a neural network model is pre-trained using labeled cephalometric data to identify the above anatomical structures, thereby automatically obtaining the anatomical structure information required in this step based on the provided craniofacial image information.

[0137] Step 3: Based on the anatomical information, obtain the scoring results of the upper and lower incisors using the preset incisor compensation index assessment standard.

[0138] The incisor compensation index assessment criteria in this step include the following criteria for maxillary incisors:

[0139] (1) Maxillary incisor angle UI-SN: UI-SN < 100° is rated as -2 points, 100° ≤ UI-SN < 110° is rated as 0 points, 110° ≤ UI-SN < 115° is rated as 2 points, 115° ≤ UI-SN < 120° is rated as 3 points, and UI-SN ≥ 120° is rated as 4 points;

[0140] (2) Maxillary incisor protrusion distance UI-NA: UI-NA < 3mm is rated as -1 point, 3mm ≤ UI-NA < 7mm is rated as 0 points, and UI-NA ≥ 7mm is rated as 1 point;

[0141] (3) Maxillary position SNA: SNA≥87° is rated as -1 point, 79°≤SNA<87° is rated as 0 points, and SNA<79° is rated as 1 point.

[0142] For the maxillary incisors, the total score is calculated based on the above evaluation criteria.

[0143] The incisor compensation index assessment criteria in this step include the following criteria for mandibular incisors:

[0144] (1) Mandibular incisor angle LI-MP: LI-MP≥100° is rated as -2 points, 85°≤LI-MP<100° is rated as 0 points, 75°≤LI-MP<85° is rated as 2 points, 70°≤LI-MP<75° is rated as 3 points, and LI-MP<70° is rated as 4 points;

[0145] (2) Mandibular incisor convexity distance LI-NB: LI-NB < 4mm is rated as -1 point, 4mm ≤ LI-NB < 8mm is rated as 0 points, and LI-NB ≥ 8mm is rated as 1 point;

[0146] (3) Mandibular position SNB: SNB < 76° is rated as -1 point, 76° ≤ SNB < 84° is rated as 0 points, and SNB ≥ 84° is rated as 1 point.

[0147] For the mandibular incisors, the total score is calculated based on the above evaluation criteria.

[0148] Step 4: Determine the torque of the upper and lower incisor brackets based on the scoring results.

[0149] In this step, the torque of the maxillary incisor bracket is determined based on the scoring results, including:

[0150] (1) When the total score of the maxillary incisor compensation index is <2, the torque of the maxillary central incisor bracket should be 17° and the torque of the maxillary lateral incisor bracket should be 10°.

[0151] (2) When 2≤Total score of maxillary incisor compensation index≤3, the torque of the maxillary central incisor bracket is selected as 12°, and the torque of the maxillary lateral incisor bracket is selected as 6°.

[0152] (3) When the total score of the maxillary incisor compensation index is ≥4, the torque of the maxillary central incisor bracket should be 7° and the torque of the maxillary lateral incisor bracket should be 2°.

[0153] In this step, the torque of the mandibular incisor bracket is determined based on the scoring results, including:

[0154] (1) When the total score of the mandibular incisor compensation index is <2, the torque of the mandibular incisor bracket should be -6°;

[0155] (2) When 2≤total score of mandibular incisor compensation index≤3, the torque of mandibular incisor bracket should be -1°;

[0156] (3) When the total score of the mandibular incisor compensation index is 4, the torque of the mandibular incisor bracket should be 4°.

[0157] (4) When the total score of the mandibular incisor compensation index is >4, the torque of the mandibular incisor bracket should be 7°.

[0158] As is known in the art, the torque of a bracket controls the labial or lingual movement of the tooth root. The above definition of positive and negative torque is as follows: if the root end of the bracket groove protrudes more labially than the crown end, it is a positive bracket torque (the angle is a positive number). In this case, when the archwire enters the groove and expresses the torque, it will cause the crown to move labially and the root to move lingually. Conversely, it is a negative bracket torque (the angle is a negative number).

[0159] For the remaining parameters of the incisor brackets, the standard MBT orthodontic bracket data can be used, and no restrictions are imposed here.

[0160] The incisor brackets manufactured using the method described in this embodiment can be applied to orthodontic treatment before and after orthognathic surgery for patients with skeletal Class III dentofacial deformities of varying severity. This allows the labially inclined upper incisors and lingually inclined lower incisors to stand upright in the alveolar bone, achieving complete orthodontic decompensation, increasing the anterior overbite of patients with skeletal Class III dentofacial deformities, and creating space for jawbone movement during orthognathic surgery.

[0161] Example 2

[0162] For patients with skeletal Class III dentofacial deformities, most patients require reduction of the maxillary first premolar and strong anchorage retraction of the maxillary anterior teeth during preoperative orthodontic treatment. This necessitates moving the maxillary canine 4-6 mm within the alveolar bone to the position of the first premolar. This significant tooth movement often causes distal tilting of the canine, which conventional bracket designs struggle to resist and control root movement. Therefore, this embodiment comprehensively considers the axial tilt of the canines and the treatment plan for patients with skeletal Class III dentofacial deformities, providing an adaptive design for maxillary canine orthodontic brackets specifically for skeletal Class III dentofacial deformities.

[0163] Specifically, such as Figure 2 As shown, the method for parameter design of maxillary canine orthodontic brackets for skeletal Class III dentofacial deformities in this embodiment includes:

[0164] Step 1: Obtain the patient's craniofacial image information.

[0165] The craniofacial image information in this step includes images of the patient's skull, jawbone, and dentition. Typically, CBCT and intraoral scans can be used to obtain CBCT images and intraoral scan images of the patient's skull. The CBCT images and intraoral scan images are then registered to obtain a digital three-dimensional craniofacial model.

[0166] Step 2: Obtain the maxillary canine axis inclination angle based on craniofacial image information.

[0167] In this step, the maxillary canine axis inclination angle is obtained using the three-dimensional craniofacial model obtained in step one. (Reference) Figure 7 The axial tilt angle of a tooth is the clinical crown long axis of the tooth ( Figure 7 The angle formed by the dotted line (as shown in the middle) and the perpendicular line from the 𬌗 plane on the mesial and distal planes represents the degree of mesial and distal inclination of the tooth. Clinically, the axial inclination angle is positive when the long axis of the crown is tilted distally towards the root, and negative when it is tilted mesially. The red arrows indicate the corresponding axial inclination angles.

[0168] For obtaining the axial tilt angle of the maxillary canine from a three-dimensional craniofacial model, there are many related technical solutions in the prior art, such as the Chinese patent with patent number CN114431989B, entitled "Method for establishing a coordinate system based on the target dental arch curve, automatic tooth arrangement method and tooth movement evaluation method", which provides a method for establishing a local coordinate system for each tooth, thereby making it applicable to automatically obtaining the axial tilt angle of each tooth.

[0169] Step 3: Based on the maxillary canine axis inclination and the maxillary extraction plan, obtain the maxillary canine scoring results using the preset maxillary canine compensation index assessment standard.

[0170] In this step, the criteria for assessing the maxillary canine compensation index include:

[0171] (1) Maxillary canine axis inclination: Maxillary canine axis inclination > 10° is rated as -1 point, 6° < maxillary canine axis inclination ≤ 10° is rated as 0 points, 6° ≤ maxillary canine axis inclination < 2° is rated as 1 point, and maxillary canine axis inclination ≤ 2° is rated as 2 points;

[0172] (2) Maxillary extraction plan: If the maxillary extraction plan is non-reduction treatment, it is rated as 0 points; if the maxillary extraction plan is reduction of the maxillary bilateral second premolars, it is rated as 1 point; if the treatment plan is reduction of the maxillary bilateral first premolars, it is rated as 3 points.

[0173] For the maxillary canines, the total score is calculated based on the above evaluation criteria.

[0174] Step 4: Determine the axial inclination of the maxillary canine bracket based on the scoring results.

[0175] In this step, the axial inclination of the maxillary canine bracket is determined based on the scoring results, including:

[0176] (1) When the total score of the maxillary canine compensation index is ≤0, the axial inclination of the maxillary canine bracket should be 8°;

[0177] (2) When 1≤total score of maxillary canine compensation index≤2, the axial inclination of the maxillary canine bracket should be 10°;

[0178] (3) When the total score of the maxillary canine compensation index is ≥3, the axial inclination of the maxillary canine bracket should be 12°.

[0179] As is known in the art, the axial tilt of a bracket controls the mesial or distal movement of the tooth root. The above definition of positive or negative axial tilt is: if the root end of the bracket groove is more mesial than the crown end, the axial tilt is positive (the angle is a positive number); if it is more distal, the axial tilt is negative (the angle is a negative number).

[0180] For the remaining parameters of the maxillary canine bracket, the standard MBT orthodontic bracket data can be used, and no restrictions are imposed here.

[0181] The maxillary canine brackets manufactured using the method described in this embodiment are suitable for patients with skeletal Class III dentofacial deformities of varying severity. They are bonded to the patient's maxillary canines at the beginning of treatment. The additional axial tilt in the brackets can effectively achieve preoperative orthodontic alignment and decompensation of the maxillary canines. For maxillary canines with different movement ranges, it avoids unintended tilting, effectively achieves orthodontic root control movement, and better creates stable occlusal support for orthognathic surgery.

[0182] Example 3

[0183] Given that conventional orthodontic canine brackets cannot fully align the severely tilted long axis of the mandibular canines in patients with skeletal deformities, the unaligned canines will cause occlusal interference between the upper and lower jaws after orthognathic surgery, leading to occlusal deviation and recurrence of skeletal deformities postoperatively. Furthermore, patients with skeletal Class III dentofacial deformities have excessively lingual and distally tilted mandibular canines, posing a risk of bone fenestration / bone dehiscence. Preoperative root control during orthodontic treatment is necessary to move the fenestrated roots into the alveolar bone to ensure periodontal tissue safety; however, current conventional bracket designs cannot achieve this movement. Therefore, the technical solution in this embodiment comprehensively considers the position of the upper and lower jaws, the position of the canines, and the degree of bone fenestration / bone dehiscence in patients with skeletal Class III dentofacial deformities, providing an adaptive design for mandibular canine orthodontic brackets specifically for skeletal Class III dentofacial deformities.

[0184] Specifically, such as Figure 3 As shown in this embodiment, the method for parameter design of mandibular canine orthodontic brackets for skeletal Class III dentofacial deformities includes:

[0185] Step 1: Obtain the patient's craniofacial image information.

[0186] The craniofacial image information in this step includes images of the patient's skull, jawbone, and dentition. Typically, CBCT and intraoral scans can be used to obtain CBCT images and intraoral scan images of the patient's skull. The CBCT images and intraoral scan images are then registered to obtain a digital three-dimensional craniofacial model.

[0187] Step 2: Obtain the mandibular canine axis tilt angle and the anatomical information related to mandibular canine compensation assessment based on craniofacial image information. The anatomical information includes the ANB angle, mandibular canine torque angle, and degree of mandibular canine bone fenestration / bone splitting.

[0188] In this step, using the three-dimensional craniofacial model obtained in Step One, the mandibular canine axis tilt angle, mandibular canine torque angle, and degree of mandibular canine bone fenestration / fracture are obtained. (Reference) Figure 8 The torque angle of a tooth is the clinical crown long axis of the tooth ( Figure 8The labial and lingual inclination (shown by the dashed line) is used as a reference line. A perpendicular line passing through the center of the clinical crown and perpendicular to the umbilical plane is used. When the long axis of the clinical crown is inclined lingually towards the root, the torque angle is positive; when it is inclined labially, the torque angle is negative. The red arrows indicate the corresponding torque angles. For the axial inclination angle of the mandibular canine, refer to the explanation of the axial inclination angle of the tooth in Example 2.

[0189] For obtaining the mandibular canine axial tilt angle and mandibular canine torque angle from a three-dimensional craniofacial model, there are many related technical solutions in the prior art, such as the aforementioned Chinese patent with patent number CN114431989B, entitled "Method for establishing a coordinate system based on the target dental arch curve, automatic tooth arrangement method and tooth movement evaluation method", which provides a method for establishing a local coordinate system for each tooth, applicable to automatically obtaining the axial tilt angle and torque angle of each tooth.

[0190] The degree of bone fenestration / bone fissure in the mandibular canine is defined as a measure of the length of alveolar bone defect on the labial side of the tooth root. In this embodiment, it is evaluated as the ratio of the extension length of bone fenestration / bone fissure in the long axis direction of the tooth to the length of the tooth root. Figure 9 This is a schematic diagram of the labial bone fenestration / bone splitting of the root of the mandibular canine in different three-dimensional maxillofacial models. The yellow area shows the mandibular canine, with the bright yellow representing the exposed external surface and the dark yellow representing the surface embedded in the alveolar bone. The degree of bone fenestration / bone splitting decreases from left to right in the diagram.

[0191] Specifically, the labial surface of the tooth and the alveolar bone can be projected onto a reference plane of the tooth's local coordinate system. Within this plane, the extension length of the bone fenestration / fracture and the root length along the tooth's long axis are measured. For example, based on the aforementioned Chinese patent CN114431989B, a local coordinate system for the mandibular canine is established. One axis of this local coordinate system is the tooth's long axis, and the other two axes extend along the mesiodistal and labiolingual directions, respectively. The plane defined by the tooth's long axis and the mesiodistal axis can be used as a reference plane. The labial surface of the mandibular canine and the alveolar bone are projected onto this reference plane. On the projected image of this plane, the extension length of the bone fenestration / fracture and the root length along the long axis are measured. Based on this setup, the degree of bone fenestration / fracture in the mandibular canine can be directly obtained through a software system.

[0192] ANB angle is derived from head shadow measurement projects, for reference. Figure 10 The specific anatomical structures involved include:

[0193] Nasal root point (N): The foremost point of the nasofrontal suture, a landmark of the anterior cranial region, representing the junction of the face and skull.

[0194] Subspinale (A): The most concave point of bone between the anterior nasal spine and the margin of the superior alveolar ridge.

[0195] Supramental (B): The most concave point of bone between the point of the inferior alveolar process and the point of the anterior chin.

[0196] Angle ANB is the angle formed by the line connecting NA and NB, i.e. Figure 10 The acute angle shown in the figure.

[0197] In some embodiments, a neural network model is pre-trained using labeled cephalometric data to identify the above anatomical structures, thereby automatically obtaining the ANB angle based on the provided craniofacial image information.

[0198] Step 3: Based on the anatomical information, obtain the score of the mandibular canine using the preset mandibular canine compensation index assessment standard.

[0199] In this step, the criteria for assessing the mandibular canine compensation index include:

[0200] (1) ANB angle: ANB angle > 0° is rated as -1 point, -2° ≤ ANB angle ≤ 0° is rated as 0 points, and ANB angle < -2° is rated as 1 point;

[0201] (2) Mandibular canine torque angle: Mandibular canine torque angle ≥ -2° is rated as -2 points, -2° < Mandibular canine torque angle ≤ -10° is rated as 0 points, -14° < Mandibular canine torque angle < -10° is rated as 2 points, and Mandibular canine torque angle ≤ -14° is rated as 4 points;

[0202] (3) Degree of bone fenestration / bone splitting in mandibular canine: 2 points are awarded if bone fenestration / bone splitting degree ≤ 1 / 3 of root length, 3 points are awarded if root length 1 / 3 < bone fenestration / bone splitting degree ≤ 1 / 2 of root length, 4 points are awarded if bone fenestration / bone splitting degree > 1 / 2 of root length, and 0 points are awarded if there is no bone fenestration / bone splitting.

[0203] For the mandibular canines, the total score is calculated based on the above evaluation criteria.

[0204] Step 4: Determine the torque and axial inclination of the mandibular canine bracket based on the scoring results and the mandibular canine axial inclination angle.

[0205] In this step, the torque of the mandibular canine bracket is determined based on the scoring results, including:

[0206] (1) When the total score of the mandibular canine compensation index is <2, the torque of the mandibular canine bracket should be -6°;

[0207] (2) When 2≤total score of mandibular canine compensation index≤5, the torque of mandibular canine bracket should be -1°;

[0208] (3) When the total score of the mandibular canine compensation index is >5, the torque of the mandibular canine bracket should be 4°.

[0209] In this step, the axial inclination of the mandibular canine bracket is determined based on the axial inclination angle of the mandibular canine, including:

[0210] (1) When the axial inclination angle of the mandibular canine is ≥0°, the axial inclination of the mandibular canine bracket should be 3°;

[0211] (2) When -4°≤ mandibular canine axial inclination <0°, the axial inclination of the mandibular canine bracket should be 6°;

[0212] (3) When the axial inclination of the mandibular canine is < -4°, the axial inclination of the mandibular canine bracket should be 9°.

[0213] For the remaining parameters of the mandibular canine bracket, the standard MBT orthodontic bracket data can be used, and no restrictions are imposed here.

[0214] The mandibular canine brackets manufactured using the method described in this embodiment are suitable for patients with skeletal Class III dentofacial deformities of varying severity. They are bonded to the patient's mandibular canines at the beginning of treatment. The different additional torques and axial inclinations set in the brackets effectively achieve preoperative orthodontic alignment and decompensation of the mandibular canines, straightening the previously excessively lingually tilted and distally tilted mandibular canines to a normal angle, moving the tooth roots into the alveolar bone, which is beneficial to periodontal health and creates a more stable occlusal support for orthognathic surgery.

[0215] Example 4

[0216] Patients with skeletal Class III dentofacial deformities experience sagittal misalignment of the jawbone, leading to lateral misalignment of the dental arch width. This manifests as an excessively wide maxillary molar arch with buccal tilt, and a narrow mandibular arch with lingual tilt. Currently, conventional buccal tubes cannot correct this arch width misalignment in the molar segment. Excessive buccal-lingual tilt of the molars prevents preoperative orthodontic alignment of the upper and lower dental arches into a width-matched oval shape. Postoperatively, stable cusp-fossa interlocking cannot be achieved. The excessively wide maxillary arch causes the palatal cusp of the maxillary molar to bite against the buccal cusp of the mandibular molar, or even results in orthognathic interlocking, causing occlusal trauma and interference, hindering stable postoperative orthodontic outcomes, and making it difficult to establish a normal molar relationship during postoperative orthodontic treatment. Therefore, this embodiment's technical solution comprehensively considers the lateral position of the upper and lower jawbones and the buccal-lingual tilt of the molars in patients with skeletal Class III dentofacial deformities, providing an adaptive design for a buccal tube in molar orthodontics specifically for skeletal Class III dentofacial deformities.

[0217] Specifically, the method for parameter design of the buccal tube in molar orthodontics for skeletal Class III dentofacial deformities in this embodiment includes:

[0218] Step 1: Obtain the patient's craniofacial image information.

[0219] The craniofacial image information in this step includes images of the patient's skull, jawbone, and dentition. Typically, CBCT and intraoral scans can be used to obtain CBCT images and intraoral scan images of the patient's skull. The CBCT images and intraoral scan images are then registered to obtain a digital three-dimensional craniofacial model.

[0220] Step 2: Obtain anatomical information related to molar compensation assessment based on craniofacial images. The anatomical information includes the molar torque angle and the width of the maxillary and mandibular basal bones.

[0221] In this step, the molar torque angle and the width of the maxillary and mandibular basal bones are obtained using the three-dimensional craniofacial model obtained in step one. For the molar torque angle, please refer to the description of the tooth torque angle in Example 3.

[0222] There are many existing technical solutions for obtaining molar torque angles from three-dimensional craniofacial models, such as the aforementioned Chinese patent with patent number CN114431989B, entitled "Method for establishing a coordinate system based on the target dental arch curve, automatic tooth arrangement method and tooth movement evaluation method", which provides a method for establishing a local coordinate system for each tooth, applicable to automatically obtaining the torque angle of each tooth.

[0223] Figure 11 The image shows the measurement locations of the width of the maxillary and mandibular basal bones in a CBCT image. In some embodiments, a neural network model is pre-trained using labeled CBCT image data to identify the aforementioned measurement locations of the width of the maxillary and mandibular basal bones, thereby automatically obtaining the width of the maxillary and mandibular basal bones.

[0224] Step 3: Based on the anatomical information, obtain the scoring results of the upper and lower molars using the preset molar compensation index assessment standard.

[0225] The assessment criteria for the molar compensation index in this step include the following for the maxillary molars:

[0226] (1) Torque angle of maxillary molar: The torque angle of maxillary molar ≤ -18° is rated as -2 points, -18° < maxillary molar torque angle ≤ -12° is rated as 0 points, -12° < maxillary molar torque angle ≤ -8° is rated as 2 points, and the torque angle of maxillary molar > -8° is rated as 4 points;

[0227] (2) Difference in width of the upper and lower jaw bases: A difference in width of the upper and lower jaw bases < -2.5mm is rated as -2 points, -2.5mm ≤ difference in width of the upper and lower jaw bases ≤ 1.5mm is rated as 0 points, and a difference in width of the upper and lower jaw bases > 1.5mm is rated as 2 points.

[0228] For each maxillary molar, the total score is calculated according to the above evaluation criteria.

[0229] The assessment criteria for the molar compensation index in this step include the following for the mandibular molars:

[0230] (1) Torque angle of mandibular first molar: The torque angle of mandibular first molar > -16° is rated as -2 points, -24° < mandibular first molar torque angle ≤ -16° is rated as 0 points, -28° < mandibular first molar torque angle ≤ -24° is rated as 2 points, and the torque angle of mandibular first molar ≤ -28° is rated as 4 points;

[0231] (2) Torque angle of mandibular second molar: The mandibular second molar torque angle > -6° is rated as -2 points, -14° < mandibular second molar torque angle ≤ -6° is rated as 0 points, -18° < mandibular second molar torque angle ≤ -14° is rated as 2 points, and mandibular second molar torque angle ≤ -18° is rated as 4 points;

[0232] (3) Difference in width of the upper and lower jaw bases: A difference in width of the upper and lower jaw bases < -2.5mm is rated as -2 points, -2.5mm ≤ difference in width of the upper and lower jaw bases ≤ 1.5mm is rated as 0 points, and a difference in width of the upper and lower jaw bases > 1.5mm is rated as 2 points.

[0233] For the mandibular first molar, the total score is calculated according to items (1) and (3) of the above assessment criteria; for the mandibular second molar, the total score is calculated according to items (2) and (3) of the above assessment criteria.

[0234] Step 4: Determine the torque and base plate thickness of the buccal tubes of the maxillary and mandibular molars based on the scoring results and the width of the maxillary and mandibular basal bones, respectively.

[0235] In this step, the torque of the buccal canal of the maxillary molar is determined based on the scoring results, including:

[0236] (1) When the total score of the compensation index of the maxillary molar is ≤0, the torque of the buccal tube of the maxillary molar is selected as -14°;

[0237] (2) When the total score of the maxillary molar compensation index is 2, the torque of the buccal tube of the maxillary molar is selected as -19°.

[0238] (3) When the total score of the maxillary molar compensation index is ≥4, the torque of the maxillary molar buccal tube is selected as -24°.

[0239] In this step, the thickness of the base plate of the buccal canal of the maxillary molar is determined based on the width of the maxillary and mandibular abdominus bones, including:

[0240] (1) When the difference between the widths of the maxillary and mandibular base bones is ≥-2.5mm and ≤1.5mm, the thickness of the base plate of the buccal tube of the maxillary molar is selected as 0.7mm;

[0241] (2) When the difference between the widths of the maxillary and mandibular base bones is less than -2.5 mm, the thickness of the base plate of the buccal tube of the maxillary molar should be 0.4 mm.

[0242] (3) When the difference between the width of the maxillary and mandibular base bones is greater than 1.5 mm, the thickness of the base plate of the buccal tube of the maxillary molar is selected as 1.2 mm.

[0243] In this step, the torque of the buccal canal of the mandibular molar is determined based on the scoring results, including:

[0244] (1) When the total score of the compensation index of the mandibular first molar is ≤0, the torque of the buccal tube of the mandibular first molar is selected as -20°;

[0245] (2) When the total score of the compensation index of the mandibular first molar is 2, the torque of the buccal tube of the mandibular first molar is selected as -15°.

[0246] (3) When the total score of the compensation index of the mandibular first molar is ≥4, the torque of the buccal tube of the mandibular first molar is selected as -10°.

[0247] (4) When the total score of the compensation index of the mandibular second molar is ≤0, the torque of the buccal tube of the mandibular second molar is selected as -10°;

[0248] (5) When the total score of the compensation index of the mandibular second molar is 2, the torque of the buccal tube of the mandibular second molar is selected as -5°;

[0249] (6) When the total score of the compensation index of the mandibular second molar is ≥4, the torque of the buccal tube of the mandibular second molar is selected as 0°.

[0250] In this step, the thickness of the base plate of the buccal canal of the mandibular molar is determined based on the width of the maxillary and mandibular abdominus bones, including:

[0251] (1) When the difference between the widths of the maxillary and mandibular base bones is ≥-2.5mm and ≤1.5mm, the thickness of the base plate of the buccal tube of the mandibular molar is selected as 0.55mm;

[0252] (2) When the difference between the widths of the maxillary and mandibular base bones is less than -2.5 mm, the thickness of the base plate of the buccal tube of the mandibular molar should be 1.05 mm.

[0253] (3) When the difference between the width of the upper and lower jawbone is greater than 1.5 mm, the thickness of the base plate of the buccal tube of the mandibular molar is selected as 0.3 mm.

[0254] For the remaining parameters of the buccal tube for molars, the standard MBT orthodontic buccal tube data can be used, and no restrictions are imposed here.

[0255] The buccal tube for molars, fabricated using the method described in this embodiment, is suitable for patients with skeletal Class III dentofacial deformities of varying severity and width discrepancies in the molar segments. It is bonded to the patient's upper and lower molars at the beginning of treatment. The different additional torques and base plate thicknesses of the buccal tube can effectively achieve preoperative orthodontic molar alignment and decompensation, straightening the previously excessively buccal-lingually tilted molars to a normal angle, reducing the maxillary arch and expanding the mandibular arch, thus achieving a match in the width of the upper and lower dental arches.

[0256] Figure 12 An exemplary system is shown that can be used to implement the various embodiments or combinations of embodiments described in this invention.

[0257] like Figure 12 As shown, in some embodiments, system 1000 can function as any of the user terminal devices described in each of the embodiments. In some embodiments, system 1000 may include one or more computer-readable media having instructions (e.g., system memory or NVM / storage device 1020) and one or more processors (e.g., one or more processors 1005) coupled to the one or more computer-readable media and configured to execute the instructions to implement the module and thus perform the actions described in this invention.

[0258] In one embodiment, the system control module 1010 may include any suitable interface controller to provide any suitable interface to at least one of the processors 1005 and / or any suitable device or component communicating with the system control module 1010.

[0259] The system control module 1010 may include a memory controller module 1030 to provide an interface to the system memory 1015. The memory controller module 1030 may be a hardware module, a software module, and / or a firmware module.

[0260] System memory 1015 may be used, for example, to load and store data and / or instructions for system 1000. In one embodiment, system memory 1015 may include any suitable volatile memory, such as suitable DRAM. In some embodiments, system memory 1015 may include double data rate type quad synchronous dynamic random access memory (DDR4 SDRAM).

[0261] In one embodiment, the system control module 1010 may include one or more input / output (I / O) controllers to provide interfaces to the NVM / storage device 1020 and (one or more) communication interfaces 1025.

[0262] For example, the NVM / storage device 1020 may be used to store data and / or instructions. The NVM / storage device 1020 may include any suitable non-volatile memory (e.g., flash memory) and / or may include any suitable (one or more) non-volatile storage devices (e.g., one or more hard disk drives (HDDs), one or more optical disc drives (CDs), and / or one or more digital universal optical disc (DVD) drives).

[0263] NVM / storage device 1020 may include storage resources that are physically part of a device on which system 1000 is mounted, or that can be accessed by the device without necessarily being part of the device. For example, NVM / storage device 1020 may be accessed via a network through one or more communication interfaces 1025.

[0264] One or more communication interfaces 1025 may provide the system 1000 with an interface to communicate over one or more networks and / or with any other suitable device. The system 1000 may wirelessly communicate with one or more components of a wireless network in accordance with any of one or more wireless network standards and / or protocols.

[0265] In one embodiment, at least one of the processors 1005 may be logically packaged with one or more controllers of the system control module 1010 (e.g., memory controller module 1030). In one embodiment, at least one of the processors 1005 may be logically packaged with one or more controllers of the system control module 1010 to form a system-in-package (SiP). In one embodiment, at least one of the processors 1005 may be integrated with the logic of one or more controllers of the system control module 1010 on the same die. In one embodiment, at least one of the processors 1005 may be integrated with the logic of one or more controllers of the system control module 1010 on the same die to form a system-on-a-chip (SoC).

[0266] In various embodiments, system 1000 may be, but is not limited to, a server, workstation, desktop computing device, or mobile computing device (e.g., laptop computing device, handheld computing device, tablet computer, netbook, etc.). In various embodiments, system 1000 may have more or fewer components and / or different architectures. For example, in some embodiments, system 1000 includes one or more cameras, a keyboard, a liquid crystal display (LCD) screen (including a touchscreen display), a non-volatile memory port, multiple antennas, a graphics chip, an application-specific integrated circuit (ASIC), and a speaker.

[0267] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for selecting parameters for mandibular canine orthodontic brackets for skeletal Class III dentofacial deformities, characterized in that, include: Obtain the patient's craniofacial images; The mandibular canine torque angle and the anatomical information related to mandibular canine compensation assessment are obtained based on the craniofacial image information. The anatomical information includes the ANB angle, the mandibular canine torque angle and the degree of mandibular canine bone fenestration / fracture. The scoring results of the mandibular canines are obtained based on the anatomical information using a preset mandibular canine compensation index assessment standard. The torque and axial tilt of the mandibular canine bracket are determined based on the scoring results and the mandibular canine torque angle, respectively.

2. The method as described in claim 1, characterized in that, The mandibular canine compensation index assessment criteria include: (1) ANB angle: ANB angle > 0° is rated as -1 point, -2° ≤ ANB angle ≤ 0° is rated as 0 points, and ANB angle < -2° is rated as 1 point; (2) Mandibular canine torque angle: Mandibular canine torque angle ≥ -2° is rated as -2 points, -2° < Mandibular canine torque angle ≤ -10° is rated as 0 points, -14° < Mandibular canine torque angle < -10° is rated as 2 points, and Mandibular canine torque angle ≤ -14° is rated as 4 points; (3) Degree of bone fenestration / fracture in mandibular canine: 2 points are awarded if bone fenestration / fracture is ≤ 1 / 3 of root length, 3 points are awarded if root length < 1 / 3 of bone fenestration / fracture is ≤ 1 / 2 of root length, 4 points are awarded if bone fenestration / fracture is > 1 / 2 of root length, and 0 points are awarded if there is no bone fenestration / fracture.

3. The method as described in claim 2, characterized in that, The torque of the mandibular canine bracket is determined based on the scoring results, including: (1) When the total score of the mandibular canine compensation index is <2, the torque of the mandibular canine bracket should be -6°; (2) When 2≤total score of mandibular canine compensation index≤5, the torque of mandibular canine bracket should be -1°; (3) When the total score of the mandibular canine compensation index is >5, the torque of the mandibular canine bracket should be 4°.

4. The method as described in claim 1, characterized in that, Determining the axial inclination of the mandibular canine bracket based on the mandibular canine axial inclination angle includes: (1) When the axial inclination angle of the mandibular canine is ≥0°, the axial inclination of the mandibular canine bracket should be 3°; (2) When -4°≤ mandibular canine axial inclination <0°, the axial inclination of the mandibular canine bracket should be 6°; (3) When the axial inclination of the mandibular canine is < -4°, the axial inclination of the mandibular canine bracket should be 9°.

5. A method for generating a digital model of a mandibular canine orthodontic bracket for skeletal Class III dentofacial deformities, characterized in that, Includes the method as described in any one of claims 1 to 4.

6. A mandibular canine orthodontic bracket for skeletal Class III dentofacial deformities, characterized in that, The model is created using the method described in claim 5.

7. A device for selecting parameters of mandibular canine orthodontic brackets for skeletal Class III dentofacial deformities, wherein, The device includes: Processor; and A memory configured to store computer-executable instructions, which, when executed, cause the processor to perform the operations of the method according to any one of claims 1 to 5.

8. A computer-readable medium storing instructions that, when executed, cause a system to perform the operations of the method according to any one of claims 1 to 5.

Images