A digital jaw relationship determination method based on gothic arch

Abstract

The application discloses a kind of digital jaw position relationship determination methods based on gothic arch, it is related to oral implantation restoration technical field, to solve how to accurately position the problem of the jaw position relationship of terminal dentition patient.The method first determines the centric relation of patient using gothic arch tracing method, obtains horizontal jaw position relationship and arrowhead vertex position;Then respectively obtain the three-dimensional image of the face of patient wearing gothic arch and rest jaw position, to establish three-dimensional coordinate system with patient face information, then according to the information of upper and lower jaw, construct the digital model of upper and lower jaw and match to three-dimensional coordinate system, finally use cycloid to drive lower jaw model to rotate around hinge shaft relative to upper jaw model, to simulate the vertical jaw position relationship of mandibular physiology movement, to complete the accurate positioning of the jaw position relationship of terminal dentition patient.The method simulates mandibular movement by digitization, reduces artificial error, and the determined jaw position relationship is more accurate.

Description

Technical Field

[0001] This invention belongs to the field of oral implant restoration technology, specifically relating to a digital jaw position relationship determination method based on Gothic arches. Background Technology

[0002] In the field of dental implant restoration, accurate determination of jaw position is a crucial foundation for occlusal reconstruction and functional restoration in patients with missing teeth. However, for patients with terminal dentition, i.e., those whose occlusal relationship is disordered due to severe wear, elongation, or loosening of remaining teeth, requiring extraction of remaining teeth for full / partial mouth implant restoration, determining the jaw position presents certain operational challenges. These challenges mainly manifest in: ① Lack of jaw position reference: Due to long-term compensatory wear or pathological displacement, the remaining teeth in patients with terminal dentition lose their physiological reference value in terms of existing occlusal planes and vertical heights, rendering traditional jaw position recording methods based on natural teeth ineffective. ② Unpredictability of dynamic occlusal interference: Terminal dentition is often accompanied by adaptive remodeling of the temporomandibular joint. Existing static occlusal records (such as wax rims) cannot reflect the potential compensatory changes in the articular-muscle chain after tooth extraction, easily leading to functional occlusal instability after restoration. Therefore, it is difficult to accurately locate the jaw relationship of patients with terminal dentition using traditional methods of determining jaw position (such as the wax ridge method), especially for patients with occlusal interference and who did not have teeth extracted before surgery. Summary of the Invention

[0003] This invention provides a digital method for determining jaw position relationships based on the Gothic arch, aiming to solve the problem of how to accurately locate the jaw position relationships of patients with terminal dentition.

[0004] The technical solution adopted by this invention to solve its technical problem is: a digital jaw position relationship determination method based on Gothic arches, comprising the following steps:

[0005] S1. Use the Gothic bow tracing method to determine the patient's midline position and obtain the position of the arrow apex; the position of the arrow apex is the vertex of the arrow pattern drawn by the Gothic bow tracing pointer on the tracing board;

[0006] S2. Acquire the first and second three-dimensional facial images of the patient; the first three-dimensional facial image is the facial image acquired when the patient is wearing a Gothic bow locked at the apex of the arrow, and the second three-dimensional facial image is the facial image acquired when the patient is in a resting jaw position.

[0007] S3. Obtain the maxillary and mandibular bone information of the patient when wearing a Gothic bow locked at the arrow tip position, construct the maxillary and mandibular bone models, and match them to the three-dimensional coordinate system of the first or second facial three-dimensional image; in this three-dimensional coordinate system, take the straight line passing through the patient's bilateral condyles as the hinge axis, and take the straight line passing through the patient's nasal tip and chin as the midline of the face, and establish a central plane passing through the midline of the face and perpendicular to the hinge axis;

[0008] S4. Record the intersection of the central plane and the hinge axis as the first point, the patient's chin in the first three-dimensional facial image as the second point, and the patient's chin in the second three-dimensional facial image as the third point. Match the second point or the third point to the above three-dimensional coordinate system. Use the straight line passing through the first point and the second point as the cycloid. Use the cycloid to drive the mandibular model to rotate around the hinge axis relative to the maxillary model until the cycloid rotates to a position 2-3 mm above the third point, thus completing the determination of the jaw position relationship.

[0009] Furthermore, in step S1, before determining the center position, the height of the Gothic bow's tracing pointer is adjusted to eliminate interference.

[0010] Furthermore, step S1 also includes: placing occlusal recording material between the maxillary and mandibular base plates of the Gothic bow locked at the arrow apex position, so that the maxillary and mandibular base plates are relatively fixed.

[0011] Furthermore, in step S2, before acquiring the first and second three-dimensional facial images, the position of the patient's condyle is verified to be ideal. If the position of the condyle is ideal, the subsequent steps are then performed.

[0012] Further, the process of verifying whether the patient's condylar position is ideal is as follows: CBCT images are taken while the patient is wearing a Gothic bow locked at the apex of the arrow. Based on the CBCT images, it is determined whether the condyle is in the superior-anterior position of the glenoid fossa. If it is, it indicates that the condylar position is ideal; otherwise, it indicates that the condylar position is not ideal.

[0013] Furthermore, in step S2, before acquiring the first and second three-dimensional facial images, the tip of the patient's nose and chin are marked.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This method first uses the Gothic arch tracing method to determine the patient's centric relationship, obtaining the horizontal jaw position and the position of the arrow apex. Then, it acquires a first three-dimensional facial image of the patient wearing the Gothic arch and a second three-dimensional facial image of the patient in a resting jaw position, establishing a three-dimensional coordinate system with the patient's facial information. Next, it constructs digital models of the maxilla and mandible based on the patient's maxillary and mandibular bone information and matches them into the three-dimensional coordinate system. Then, it generates a cycloid using the hinge axis passing through the bilateral condyles, the central plane passing through the midline of the face, and the chin in the first three-dimensional facial image as key parameters. Finally, it uses the cycloid to rotate the mandibular model around the hinge axis relative to the maxillary model until the cycloid rotates to a position 2-3 mm vertically above the chin in the second three-dimensional facial image, determining the vertical jaw position and thus accurately locating the jaw position of patients with terminal dentition. Compared to existing technologies, this method simulates mandibular physiological movement through digital technology, reducing errors caused by human evaluation and measurement, resulting in a more accurate jaw position.

[0016] 2. This method has a standardized and easy-to-use procedure for determining jaw position. On the one hand, it is based on the "gold standard" of Gothic arch tracing, which ensures the reliability and applicability of the operation. On the other hand, it introduces digital technology, which allows doctors to repeatedly simulate and verify mandibular movements. Furthermore, the entire process does not require repeated intraoral operations, which can reduce patient discomfort.

[0017] 3. Before determining the centric relationship, adjust the height of the Gothic arch tracing pointer to eliminate interference from the occlusal axis. This eliminates interference from abnormal contacts of the patient's remaining teeth on the jaw position recording. For patients with occlusal interference, this method can determine a relatively ideal jaw position without preoperative tooth extraction, requiring extraction only in the subsequent surgical stage, thus reducing trauma. Furthermore, the dentist does not need to fabricate a traditional complete denture to stabilize the jaw position after tooth extraction, reducing treatment costs and shortening the treatment cycle.

[0018] The technical effects brought about or directly generated by other technical features of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a flowchart of one embodiment of the present invention;

[0020] Figure 2 This is a flowchart of another embodiment of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the maxillary floor.

[0022] Figure 4 This is a three-dimensional structural diagram of the mandibular base plate;

[0023] Figure 5 This is a diagram illustrating a patient wearing a Gothic bow;

[0024] Figure 6 It is a three-dimensional structural diagram of the mandibular base plate with arrow graphics drawn on it;

[0025] Figure 7 It is a three-dimensional structural diagram of a Gothic bow with the upper and lower jaw plates in fixed relative positions.

[0026] Figure 8 This is a front view of the first three-dimensional facial image obtained in Example 1;

[0027] Figure 9 This is a front view of the second three-dimensional facial image obtained in Example 1;

[0028] Figure 10 This is a frontal view of the first three-dimensional facial image in Example 1 after matching the maxillary and mandibular bone models;

[0029] Figure 11 This is the right view of the first three-dimensional facial image in Example 1 after matching the maxillary and mandibular bone models;

[0030] Figure 12 This is the left view of the first three-dimensional facial image in Example 1 after matching the maxillary and mandibular bone models;

[0031] Figure 13 yes Figure 12 A schematic diagram showing the state of the maxillary and mandibular models and the cycloid.

[0032] Figure 14 This is the left view after matching the maxillary bone model, mandibular bone model, and cycloid in the second three-dimensional facial image of Example 1;

[0033] Figure 15 yes Figure 14 A schematic diagram showing the state of the mandibular model after it has been rotated to the target position by the cycloid.

[0034] Figure 16 This is a schematic diagram of the dental model structure obtained by virtual tooth arrangement based on a determined jaw position relationship in Example 1;

[0035] The markings in the diagram are as follows: 110-maxillary base plate, 120-tracing pointer, 130-mandibular base plate, 140-tracing plate, 150-arrow graphic, 210-maxillary model, 220-mandibular model, 310-hinge axis, 320-facial midline, 330-central plane, 340-cycloid. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the drawings, the same reference numerals denote components with the same or similar functions.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component 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 this invention.

[0038] The terms "approximately" or "around" when describing numerical ranges typically indicate an allowable error within ±2%. The expression "mainly composed of or constitutes" can also imply the inclusion of structural components not mentioned in the sentence. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0039] Combination Figures 1 to 15 As shown, a digital jaw position relationship determination method based on Gothic arches includes the following steps:

[0040] S1. The Gothic bow tracing method is used to determine the patient's centric relation position and obtain the position of the arrow apex. The Gothic bow tracing method was proposed by Gysi. The patient wears a Gothic bow, which is mainly composed of a maxillary base plate 110 with a tracing pointer 120 and a mandibular base plate 130 with a tracing plate 140 and a fixation plate. The tracing pointer 120 and the tracing plate 140 are used to track and record the mandibular protrusion and lateral movements. The tracing pointer 120 draws a trajectory in the shape of an arrow pattern 150 on the tracing plate 140. The jaw position when the tracing pointer 120 is at the position of the arrow apex is the centric relation position (CR). The position of the arrow apex is the apex of the arrow pattern 150.

[0041] S2. Acquire the patient's first and second three-dimensional facial images; the first three-dimensional facial image is the facial image captured when the patient is wearing a Gothic bow locked at the apex of the arrow, and the second three-dimensional facial image is the facial image captured when the patient is in a resting jaw position; the facial three-dimensional images are usually obtained by using a facial scanner to perform a full scan of the patient's face;

[0042] S3. Obtain the maxillary and mandibular bone information of the patient wearing a Gothic bow locked at the arrow apex position, construct the maxillary bone model 210 and mandibular bone model 220, and match them to the three-dimensional coordinate system of the first or second facial three-dimensional image; in this three-dimensional coordinate system, take the straight line passing through the patient's bilateral condyles as the hinge axis 310, and the straight line passing through the patient's nasal tip and chin as the midline 320, and establish a central plane 330 passing through the midline 320 and perpendicular to the hinge axis 310; the maxillary and mandibular bone information is usually obtained from CBCT images taken of the patient wearing a Gothic bow locked at the arrow apex position; CBCT (Cone Beam Computer) Tomography, or cone-beam computed tomography, is used to reduce the need for patients to wear Gothic bows. Typically, the first three-dimensional facial image and CBCT image are acquired sequentially while the patient is wearing the Gothic bow locked at the arrow apex. The central plane 330 is a plane that can bisect the patient's face as much as possible. Digital information such as the three-dimensional coordinate system, hinge axis 310, midline 320, and central plane 330 is usually established in three-dimensional design software, preferably in denture design software (such as Exocad).

[0043] S4. The intersection of the central plane 330 and the hinge axis 310 is recorded as the first point, the patient's chin in the first three-dimensional facial image is recorded as the second point, and the patient's chin in the second three-dimensional facial image is recorded as the third point. The second point or the third point is matched into the above three-dimensional coordinate system. The straight line passing through the first point and the second point is used as the cycloid 340. The cycloid 340 is used to drive the mandibular model 220 to rotate around the hinge axis 310 relative to the maxillary model 210 until the cycloid 340 rotates to a position 2-3 mm vertically above the third point (this position is the end point of rotation. At this time, the cycloid 340 passes through a specific projection point vertically upward from the third point, and the distance between this specific projection point and the third point is 2-3 mm). The jaw position relationship is determined. In this step, the second point or the third point is usually matched into the above three-dimensional coordinate system based on the corresponding and relatively fixed anatomical points (such as the forehead) in the first and second three-dimensional facial images.

[0044] According to occult consensus, the vertical distance of the patient's ICP (Intercuspal Position) plus 2-3 mm is approximately equal to the vertical distance when in the resting position. Therefore, rotating the mandibular model 220° to the cycloid 340° position, placing it 2-3 mm directly above the third point (i.e., representing the vertical upward projection distance of the chin in the second three-dimensional facial image), yields an accurate jaw position relationship. This method uses Gothic arch tracing to determine the patient's centric relationship to obtain the horizontal jaw position relationship, and simulates mandibular physiological movements to determine the vertical jaw position relationship, thus achieving accurate positioning of the jaw position relationship for patients with terminal dentition. Compared to existing technologies, this method uses digital technology to simulate mandibular movements, reducing errors caused by human evaluation and measurement, resulting in a more precise jaw position relationship. Moreover, this method has a more standardized and user-friendly process for determining jaw position. On the one hand, it is based on the "gold standard" of Gothic arch tracing, which ensures the reliability and applicability of the operation. On the other hand, it introduces digital technology, which allows doctors to repeatedly simulate and verify mandibular movements. Furthermore, the entire process does not require repeated intraoral operations, which can reduce patient discomfort.

[0045] In some embodiments, the method further includes a routine preoperative data acquisition step. This routine preoperative data acquisition step is performed before step S1 and aims to conduct preoperative assessment and implant placement planning. It mainly includes intraoral scanning and CBCT imaging. The CBCT images are primarily used to assess whether the bone volume is suitable for implant surgery. Intraoral scanning and CBCT data can be matched for preoperative virtual tooth alignment, virtual implant planning, and surgical guide design. In step S3, the constructed maxillary model 210 and mandibular model 220 can be reconstructed using the CBCT data acquired in this step. After determining the jaw position relationship, intraoral scanning and the jaw model can also be matched based on dentition information for preoperative implant design and surgical guide design.

[0046] In some implementations, before determining the centric relationship in step S1, the height of the tracing pointer 120 of the Gothic arch is adjusted to eliminate occlusal interference. That is, the height of the tracing pointer 120 of the Gothic arch is adjusted to ensure that the Gothic arch is in a state free from occlusal interference. In this way, the following are achieved: (1) Motion constraint mechanism: By adjusting the height of the tracing pointer 120 in the Gothic arch, the opening of the patient after wearing the Gothic arch is ensured to be within the normal range, so that the condyle is always within the range of pure rotational hinge movement. (2) Elimination of occlusal interference: By raising the vertical distance of occlusion by 2-3 mm, the remaining teeth can be completely disengaged, eliminating vertical and horizontal occlusal interference. For patients with occlusal interference, this method can determine a more ideal jaw relationship without preoperative tooth extraction, and only tooth extraction is required in the subsequent surgical stage, which is conducive to reducing trauma; at the same time, the doctor does not need to make a traditional complete denture to stabilize the jaw relationship after the patient's tooth extraction, which can reduce the patient's treatment cost and shorten the treatment cycle.

[0047] In some embodiments, step S1 further includes: placing occlusal recording material between the maxillary base plate 110 and the mandibular base plate 130 of the Gothic bow locked at the arrow apex position, so that the maxillary base plate 110 and the mandibular base plate 130 are relatively fixed to each other, so as to facilitate subsequent patient wearing, such as Figure 7 As shown. Occlusal recording materials are clinically usable curing materials that have good flowability before curing and certain hardness and elasticity after curing. Occlusal recording silicone rubber materials are preferred.

[0048] Combination Figure 2 As shown, in some embodiments, before acquiring the first and second three-dimensional facial images, step S2 verifies whether the patient's condylar position is ideal. If the condylar position is ideal, subsequent steps are performed. There are various ways to verify whether the patient's condylar position is ideal, preferably: taking CBCT images while the patient is wearing a Gothic bow locked at the apex of the arrow; determining whether the condyle is in the superior-anterior position of the glenoid fossa based on the CBCT images; if so, the condylar position is ideal; otherwise, the condylar position is not ideal. If the condylar position is not ideal, further assessment is needed to determine whether the patient is suitable for full-mouth implant restoration, usually by referring the patient to a temporomandibular joint specialist.

[0049] In some implementations, before acquiring the first and second three-dimensional facial images, step S2 marks the tip of the patient's nose and chin to facilitate subsequent point identification, such as... Figure 8 or Figure 9 As shown. The marking method is usually as follows: mark points on the tip of the patient's nose and chin with a colored pen. The marking points are a different color from the patient's skin color and are located in the center of the marked area for easy identification.

[0050] Example 1

[0051] The method provided by this invention is used to determine the jaw position relationship of a patient with terminal dentition. The steps are as follows:

[0052] Step one: Use Gothic archography to determine the patient's midline position and obtain the position of the arrow apex; the specific process is as follows:

[0053] like Figure 3 , Figure 4 and Figure 5 As shown, the patient wears a Gothic bow, which includes a maxillary base plate 110 with a tracing pointer 120 and a mandibular base plate 130 with a tracing plate 140 and a fixing plate. The maxillary base plate 110 fits with the patient's maxilla, and the tracing pointer 120 is vertically positioned and threadedly connected to the maxillary base plate 110. The mandibular base plate 130 fits with the patient's mandible. The top surface of the tracing plate 140 is a tracing plane, which is parallel to the patient's nasal ala and tragus. The fixing plate is connected to the rear edge of the tracing plate 140 by bolts and is located on the tracing plane. The fixing plate has a slot for anchoring the tracing pointer 120, and a U-shaped opening at the rear end of the fixing plate that engages with the bolts to adjust its front and rear position.

[0054] Position the maxillary base plate 110 and mandibular base plate 130 on the dentition, respectively, and adjust the height of the tracing pointer 120 to eliminate interference. Remove the mandibular base plate 130, apply wax material to the tracing plane of the tracing plate 140, and guide the patient to perform protrusion and lateral movements. The tracing pointer 120 will leave a trajectory in the shape of a corresponding arrow 150 on the tracing plane. Figure 6 As shown. Remove the mandibular base plate 130, adjust the position of the fixation piece until the slot overlaps with the apex of the arrow, and then fix the fixation piece with bolts. Next, put the mandibular base plate 130 with the fixation piece locked back into the patient's mouth, insert the recording pointer 120 into the slot of the fixation piece, insert occlusal recording silicone rubber between the maxillary base plate 110 and the mandibular base plate 130, and lock the position between them, as shown. Figure 7 As shown, the horizontal jaw position is determined.

[0055] Step two: Obtain the patient's first and second facial 3D images. The specific process is as follows: Using a purple surgical marker, mark points on the tip of the patient's nose and chin respectively; then, insert the Gothic bow, locked at the apex of the arrow, into the patient's mouth, and take CBCT images to confirm that the patient's condyle is in the superior-anterior position of the glenoid fossa. Next, use a facial scanner to scan the patient's face to obtain the first facial 3D image, such as... Figure 8 As shown; next, the Gothic bow is removed, the patient is placed in a resting jaw position, and then a facial scanner is used to scan the patient's face to obtain a second three-dimensional facial image, as shown. Figure 9 As shown.

[0056] Step 3: Construct a maxillary model 210 and a mandibular model 220 based on CBCT data, and match them to the three-dimensional coordinate system of the first facial three-dimensional image, such as... Figure 10 and Figure 11 As shown; using the dental software Exocad, in this three-dimensional coordinate system, a hinge axis 310 is established with a straight line passing through the patient's bilateral condyles, and a midline 320 is established with a straight line passing through the patient's nasal tip and chin. This midline 320 is perpendicular to the hinge axis 310. The midline 330 bisects the patient's left and right faces. Figures 10 to 13 As shown.

[0057] Step four: Record the intersection of the central plane 330 and the hinge axis 310 as the first point; record the patient's chin in the first three-dimensional facial image as the second point; and record the patient's chin in the second three-dimensional facial image as the third point. Replace the first three-dimensional facial image in step three with the second three-dimensional facial image to match the third point into the aforementioned three-dimensional coordinate system, such as... Figure 14 As shown; the straight line passing through the first and second points is taken as the cycloid 340°, as... Figure 12 and Figure 13 As shown; the cycloid 340 drives the mandibular model 220 to rotate relative to the maxillary model 210 around the hinge axis 310 until the cycloid 340 rotates to a position 2 mm vertically above the third point, as shown. Figure 14 and Figure 15 As shown, the jaw position relationship is determined.

[0058] Step five involves planning the ideal dentition and implants based on the jaw positional relationship determined in step four. The specific process involves using the dental software Exocad to virtually arrange the teeth based on the jaw positional relationship, such as... Figure 16 As shown. Next, the dental alignment information is imported into 3Shape software for virtual implant planning.

[0059] This document presents a description of various embodiments of the invention for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein has been chosen to best explain the principles, practical applications, or technological advancements of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein, compared to technologies found in the market.

[0060] In this document, various embodiments of the invention may be presented in the form of a scope. It should be understood that the scope description is merely for convenience and brevity and should not be construed as a hard limitation on the scope of the invention. Therefore, the scope description should be considered to specifically disclose all possible sub-scopes and individual numerical values ​​within that scope. For example, a description of a scope such as 1 to 6 should be considered to specifically disclose sub-scopes, such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., and individual numerical values ​​within that scope, such as 1, 2, 3, 4, 5, 6, regardless of the width of the scope.

[0061] It should be understood that, for clarity, certain features of the invention described in the context of a single embodiment may also be provided in combination in a single embodiment. Conversely, for brevity, various features of the invention described in the context of a single embodiment may also be provided individually or in any suitable sub-combination, or, where appropriate, in any other described embodiment of the invention. Unless the embodiment does not function without those features, certain features described in the context of various embodiments are not considered essential features of those embodiments.

Claims

1. A method for determining the occlusal relationship based on the Gothic arch, characterized in that, Includes the following steps: S1. The midline position of the patient is determined by the Gothic bow tracing method, and the position of the arrow apex is obtained; the position of the arrow apex is the apex of the arrow graphic (150) drawn on the tracing plate (140) by the Gothic bow tracing pointer (120); S2. Acquire the first and second three-dimensional facial images of the patient; the first three-dimensional facial image is the facial image acquired when the patient is wearing a Gothic bow locked at the apex of the arrow, and the second three-dimensional facial image is the facial image acquired when the patient is in a resting jaw position. S3. Obtain the maxillary and mandibular bone information of the patient wearing a Gothic bow locked at the apex of the arrow, construct the maxillary bone model (210) and mandibular bone model (220), and match them to the three-dimensional coordinate system of the first three-dimensional facial image or the second three-dimensional facial image; in the three-dimensional coordinate system, take the straight line passing through the patient's bilateral condyles as the hinge axis (310), and take the straight line passing through the patient's nasal tip and chin as the midline of the face (320), and establish a central plane (330) passing through the midline of the face (320) and perpendicular to the hinge axis (310). S4. The intersection of the central plane (330) and the hinge axis (310) is recorded as the first point, the patient's chin in the first three-dimensional facial image is recorded as the second point, and the patient's chin in the second three-dimensional facial image is recorded as the third point. The second point or the third point is matched into the above three-dimensional coordinate system. The straight line passing through the first point and the second point is used as the cycloid (340). The cycloid (340) is used to drive the mandibular model (220) to rotate around the hinge axis (310) relative to the maxillary model (210) until the cycloid (340) rotates to a position 2-3 mm above the third point, thus completing the determination of the jaw position relationship.

2. The method for determining the digital jaw position relationship based on the Gothic arch as described in claim 1, characterized in that: In step S1, before determining the center position, adjust the height of the Gothic bow's marking pointer (120) to ensure there is no interference.

3. The method for determining the digital jaw position relationship based on the Gothic arch according to claim 1, characterized in that, Step S1 further includes: placing occlusal recording material between the maxillary base plate (110) and mandibular base plate (130) of the Gothic bow locked at the arrow apex position, so that the maxillary base plate (110) and mandibular base plate (130) are relatively fixed.

4. A method for determining the digital jaw position relationship based on the Gothic arch, as described in any one of claims 1 to 3, characterized in that: In step S2, before acquiring the first and second facial 3D images, the position of the patient's condyle is verified to be ideal. If the position of the condyle is ideal, the subsequent steps are then performed.

5. The method for determining the digital jaw position relationship based on the Gothic arch according to claim 4, characterized in that: The process for verifying whether the patient's condylar position is ideal is as follows: CBCT images are taken while the patient is wearing a Gothic bow locked at the apex of the arrow. Based on the CBCT images, it is determined whether the condyle is in the superior-anterior position of the glenoid fossa. If it is, the condylar position is ideal; otherwise, the condylar position is not ideal.

6. The method for determining the digital jaw position relationship based on the Gothic arch according to claim 4, characterized in that: In step S2, before acquiring the first and second facial 3D images, the tip of the patient's nose and chin are marked.

Images