System and method for digitally displaying CR bit and ICP bit disharmony

Abstract

The invention discloses a system for digitally displaying non-adjustment of a CR position and an ICP position. The system comprises a CR position import program module, an ICP position import program module, a registration program module, a condyle process center point coordinate setting program module, a tooth model collision program module, a tooth model offset program module, a joint display program module and a repeated simulation program module. According to the method for digitally displaying the non-adjustment of the CR position and the ICP position, the display of the non-adjustment of the CR position and the ICP position can be realized only by intraoral scanning of the upper and lower jaw tooth models of the CR position and the ICP position, the movement of the lower jaw tooth model is slowly played, and the occurrence of the non-adjustment of the CR position and the ICP position is visually checked.

Description

Technical Field

[0001] The invention relates to the field of dentistry, and in particular to a system and method for digitally displaying the misalignment between CR and ICP positions. Background Art

[0002] The incidence of misalignment between CR and ICP is very high. In the past, the bite records of CR and ICP were collected and the upper and lower jaw plaster models were placed on a special jaw frame for analysis. Now, even if the jaw position is analyzed digitally, it is only the bite relationship of two spatial positions when displayed, which is static and difficult for doctors and patients to understand how the misalignment between CR and ICP occurs.

[0003] From a professional perspective, there are two commonly used jaw positions. One is the Centric Relationship (CR) position, which refers to the position of the mandible relative to the maxilla when the condyle is located in the most anterior and superior position in the articular fossa. When the condyle is facing the posterior slope of the articular tubercle, the mandible can be simply hinged, and the condyle and articular fossa can resist the maximum contraction force of the jaw lifting muscles without any discomfort. It is a stable position with good repeatability. The other is the Intercuspal position (ICP position for short), which refers to the position of the mandible when the cusps and fossa of the upper and lower teeth are in the most extensive and stable contact. Some scholars also call it the Maxium intercuspal position (MI, MIC, MIP position for short), or the Centric Occlusion (CO position), which is a common position for chewing.

[0004] The ICP position is relatively easy to determine clinically, which is the position of the mandible where the upper and lower teeth are in the widest contact during chewing. The confirmation of the CR position in clinical practice usually requires the patient to repeatedly do a small mouth opening exercise, and use wax biting to obtain the position of the mandible without the upper and lower teeth in contact. The most ideal occlusal state is when the CR position coincides with the ICP position.

[0005] The incoordination between CR and ICP is difficult for general doctors to understand, and patients have no way of understanding it. Usually, this process is explained through videos. Patients may understand the principle, but there is still no visual dynamic demonstration process for how the incoordination between CR and ICP occurs for the patient himself. If a professional mandibular movement recorder is used, the movement of the condyle can be recorded, but the real-time display of mandibular movement cannot be achieved, and the equipment is expensive and cumbersome to operate. The present invention only needs intraoral scanning of the upper and lower mandibular tooth models of the CR and ICP positions to realize the display of the incoordination between CR and ICP positions. It is very intuitive, and the movement of the mandibular tooth model can be slowly played to visualize how the incoordination between CR and ICP positions occurs. It is a system that dynamically simulates the patient's real CR and ICP position incoordination, which can assist doctors in diagnosis and enhance communication with patients. It is easy to operate and affordable. Summary of the invention

[0006] The purpose of the present invention is to display the process of CR and ICP misalignment of upper and lower jaw tooth models in real time by dynamically simulating the system and method of the patient's real CR and ICP misalignment. The display of CR and ICP misalignment can be realized by only scanning the upper and lower jaw tooth models of CR and ICP positions intraorally. It is very intuitive and can slowly play the movement of the mandibular tooth model to visualize how the CR and ICP misalignment occurs. To achieve the above purpose, the present invention provides a system and method for digitally displaying CR and ICP misalignment.

[0007] A system for digitally displaying the misalignment between CR and ICP positions, comprising:

[0008] CR position import program module, used to import the upper and lower jaw tooth models of CR position;

[0009] ICP position import program module, used to import the upper and lower jaw tooth models in ICP position;

[0010] A registration program module for mutual registration between tooth models, tooth models, occlusal fork, universal joint and virtual face bow;

[0011] A condylar center point coordinate setting program module is used to set the coordinates of the left and right condylar center points;

[0012] The tooth model collision program module is used to make the mandibular tooth model in the CR position perform a closed-mouth rotation movement around the line connecting the center points of the left and right condyles until it collides with the maxillary tooth model;

[0013] A tooth model shifting program module is used to shift the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position;

[0014] Joint display program module, used to display the standard three-dimensional model of condyle and glenoid fossa;

[0015] The repeated simulation program module is used to shift the mandibular tooth model from the CR position to the collision position and then to the ICP position, repeat the simulation action, and set the simulation speed.

[0016] Furthermore, the condylar center point coordinate setting program module is used to set the coordinates of the left and right condylar center points and the distance between the left and right condylar center points. If a virtual face bow is used, the ear ball is used instead of the condyle, and the ear ball center point coordinates are the condylar center point coordinates. This method is simple and easy to operate. You can also use a condylar axis recorder to obtain the true condylar axis position, and input the condylar point coordinate value. After measuring the distance between the left and right condylar center points, set the distance between the left and right condylar center points.

[0017] Furthermore, in the tooth model collision program module, the mandibular tooth model in the CR position performs a closed-mouth rotation movement around the line connecting the center points of the left and right condyles, and stops rotating when colliding with the maxillary tooth model. The mandibular tooth model remains in the collision position and no longer moves. The collision overlap area is displayed by setting the collision overlap amount of the upper and lower mandibular tooth models.

[0018] Furthermore, in the tooth model collision program module, since the collision detection of the upper and lower tooth models can be 0.01mm or even smaller, the doctor cannot directly view the collision position of the upper and lower teeth. Therefore, by setting the overlap amount of the upper and lower teeth collision penetration, the area of ​​the collision point can be displayed, and the area can be highlighted or displayed in color for easy viewing. If it is set to a negative value, the collision will not be displayed.

[0019] Furthermore, the tooth model shifting program module is specifically used to shift the mandibular tooth model where the collision occurs at the CR position to the mandibular tooth model position at the ICP position, and the shifting process adopts interpolation method to shift step by step.

[0020] Furthermore, the interpolation method in the tooth model offset program module can set the time of each interpolation to achieve an effect similar to slow motion playback, making it easier for doctors and patients to see the actual process of mandibular dislocation when the CR position and ICP position are not adjusted. It can be a mean interpolation method or a non-mean interpolation method.

[0021] Furthermore, the joint display program module is specifically used for doctors to view the movement of the condyle from the CR position to the ICP position, which facilitates communication between doctors and patients. The module may or may not display the joint.

[0022] In one embodiment, a method for digitally displaying the misalignment between CR and ICP includes:

[0023] Step 1: Import the upper and lower jaw tooth models in CR position;

[0024] Step 2: Import the upper and lower jaw tooth models in the ICP position;

[0025] Step 3: Using the maxillary tooth model at the CR position as a reference, align and overlap the maxillary tooth model at the ICP position with the maxillary tooth model at the CR position, and move the mandibular tooth model at the ICP position along with the maxillary tooth model;

[0026] Step 4: Set the coordinates of the left and right condyle center points and the distances between the left and right condyle center points;

[0027] Step 5: Rotate the mandibular tooth model in the CR position around the line connecting the center points of the left and right condyles to close the mouth, and stop when it collides with the maxillary tooth model;

[0028] Step 6: Offset the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position.

[0029] The invention discloses a system for digitally displaying the misalignment between CR and ICP positions, comprising: a CR position importing program module, an ICP position importing program module, a registration program module, a condylar center point coordinate setting program module, a tooth model collision program module, a tooth model offset program module, a joint display program module and a repeated simulation program module. A method for digitally displaying the misalignment between CR and ICP positions only requires intraoral scanning of upper and lower jaw tooth models of CR and ICP positions to realize the display of the misalignment between CR and ICP positions. The system is very intuitive, and the movement of the lower jaw tooth model can be slowly played to visualize how the misalignment between CR and ICP positions occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the registration of upper and lower jaw tooth models at CR and ICP positions in a system for digitally displaying the misalignment between CR and ICP positions;

[0032] Figure 2 A schematic diagram of the left deviation of the midline of the mandibular tooth model in the CR position in a system for digitally displaying the misalignment between the CR position and the ICP position;

[0033] Figure 3A schematic diagram of a system digitally displaying the misalignment between the CR position and the ICP position, in which the CR position mandibular tooth model moves to close the mouth and comes into contact with the maxillary tooth model;

[0034] Figure 4 A schematic diagram of a CR position mandibular tooth model in a system digitally displaying the misalignment between the CR position and the ICP position, in which the CR position is shifted to the right from the early contact position to the alignment of the upper and lower midlines;

[0035] Figure 5 A schematic diagram of a system for digitally displaying the misalignment between CR and ICP positions, in which the mandibular tooth model at the CR position is shifted, resulting in the initial right deviation of the lower midline;

[0036] Figure 6 It is a schematic diagram of a system that digitally displays the misalignment between the CR position and the ICP position, in which the lower midline is completely deviated to the right when the mandibular tooth model in the CR position is shifted to the ICP position;

[0037] Figure 7 A flow chart of a method for digitally displaying the misalignment between CR and ICP positions;

[0038] In the figure: 20-early contact collision point, 1-maxillary tooth model in CR position, 2-mandibular tooth model in ICP position, 3-mandibular tooth model in CR position, E-midline of maxillary tooth model, F-midline of mandibular tooth model DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Exemplarily, the present invention provides a system for digitally displaying the misalignment between CR and ICP positions, including: a CR position importing program module, an ICP position importing program module, an alignment program module, a condylar center point coordinate setting program module, a tooth model collision program module, a tooth model offset program module, a joint display program module and a repeated simulation program module.

[0043] Exemplarily, the condylar center point coordinate setting program module sets the coordinates of the left and right condylar center points and the distance between the left and right condylar center points.

[0044] Furthermore, if a virtual face bow is used, the ear ball is used instead of the condyle, and the coordinates of the center point of the ear ball are the coordinates of the center point of the condyle. This method is simple and easy to operate. You can also use a condylar axis recorder to obtain the true condylar axis position, and input the condylar point coordinate value. After measuring the distance between the center points of the left and right condyles, set the distance between the center points of the left and right condyles.

[0045] Exemplarily, the mandibular tooth model at the CR position in the tooth model collision program module performs a closed-mouth rotation movement around the line connecting the center points a and b of the left and right condyles, and stops rotating when it collides with the maxillary tooth model. The mandibular tooth model remains in the collision position and no longer moves. The collision overlap area is displayed by setting the collision overlap amount of the upper and lower mandibular tooth models.

[0046] See also Figure 3 In the tooth model collision program module, since the collision detection of the upper and lower tooth models can be 0.01mm or even smaller, the doctor cannot directly view the collision position of the upper and lower teeth. Therefore, by setting the overlap of the upper and lower tooth collision penetration, the area of ​​the collision point 20 can be displayed, and the area can be highlighted or displayed in color for easy viewing. If it is set to a negative value, the collision will not be displayed. You can also open the lower jaw tooth model in the CR position first, and then close the mouth, until the upper and lower jaw tooth models collide, simulating the opening and closing of a person's mouth.

[0047] Furthermore, the overlap amount of the collision penetration of the upper and lower teeth can be displayed in the tooth model collision program module through the color depth value, with the collision area being red, the edge area being blue, and the non-collision area being yellow.

[0048] Exemplarily, the tooth model shifting program module is specifically used to shift the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position, and the shifting process uses interpolation method to shift step by step.

[0049] Furthermore, the interpolation method in the tooth model offset program module can set the time of each interpolation to achieve a slow-motion playback effect, making it easier for doctors and patients to see the actual process of mandibular dislocation when the CR position and ICP position are not adjusted. It can be a mean interpolation method or a non-mean interpolation method.

[0050] See also Figure 7 A method for digitally displaying the misalignment between CR and ICP includes:

[0051] Step 1: Import the upper and lower jaw tooth models in CR position;

[0052] Step 2: Import the upper and lower jaw tooth models in the ICP position;

[0053] Step 3: Please refer to Figure 1 and Figure 2 , taking the maxillary tooth model 1 at the CR position as the reference, aligning and overlapping the maxillary tooth model at the ICP position with the maxillary tooth model at the CR position, and moving the mandibular tooth model 2 at the ICP position along with the maxillary tooth model. It is observed that the midline E of the maxillary tooth model at the ICP position deviates to the right, and the midline F of the mandibular tooth model at the CR position deviates to the left;

[0054] Step 4: Set the coordinates of the left and right condyle center points and the distances between the left and right condyle center points;

[0055] Step 5: Please refer to Figure 3 , the mandibular tooth model 3 at the CR position is rotated around the line connecting the center points of the left and right condyles to close the mouth, and stops when it collides with the maxillary tooth model, and the area of ​​the collision point 20 is displayed when the collision occurs;

[0056] Step 6: Please refer to Figure 4-6 The mandibular tooth model that collides at the CR position is offset to the mandibular tooth model position at the ICP position. The mandibular tooth model starts to offset rightward from the contact position to the position where the midlines of the upper and lower mandibular tooth models are aligned. The mandibular tooth model continues to offset rightward, resulting in the midline of the mandibular tooth model deviating to the right. When the mandibular tooth model is offset to the ICP position, the midline of the mandibular tooth model is completely deviated to the right.

[0057] Furthermore, steps five and six can display slow motion by interpolation.

[0058] The invention discloses a system for digitally displaying the misalignment between CR and ICP positions, comprising: a CR position importing program module, an ICP position importing program module, a registration program module, a condylar center point coordinate setting program module, a tooth model collision program module, a tooth model offset program module, a joint display program module and a repeated simulation program module. A method for digitally displaying the misalignment between CR and ICP positions only requires intraoral scanning of upper and lower jaw tooth models of CR and ICP positions to realize the display of the misalignment between CR and ICP positions. The system is very intuitive, and the movement of the lower jaw tooth model can be slowly played to visualize how the misalignment between CR and ICP positions occurs.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A system for digitally displaying the misalignment between CR and ICP, characterized in that: include: CR position import program module, used to import the upper and lower jaw tooth models of CR position; ICP position import program module, used to import the upper and lower jaw tooth models in ICP position; A registration program module for mutual registration between tooth models, tooth models, occlusal fork, universal joint and virtual face bow; A condylar center point coordinate setting program module is used to set the coordinates of the left and right condylar center points; The tooth model collision program module is used to make the mandibular tooth model in the CR position perform a closed-mouth rotation movement around the line connecting the center points of the left and right condyles until it collides with the maxillary tooth model; A tooth model shifting program module is used to shift the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position; Joint display program module, used to display the standard three-dimensional model of condyle and glenoid fossa; The repeated simulation program module is used to shift the mandibular tooth model from the CR position to the collision position, and then to the ICP position of the mandibular tooth model, repeat the simulation action, and set the simulation speed.

2. The system for digitally displaying the misalignment between CR and ICP as claimed in claim 1, characterized in that: The condylar center point coordinate setting program module is used to set the coordinates of the left and right condylar center points and the distance between the left and right condylar center points.

3. The system for digitally displaying the misalignment between CR and ICP as claimed in claim 1, characterized in that: The tooth model collision program module, the mandibular tooth model in the CR position performs a closed-mouth rotation movement around the line connecting the center points of the left and right condyles, stops rotating when colliding with the maxillary tooth model, and the mandibular tooth model remains at the collision position and no longer moves. The collision overlap area is displayed by setting the collision overlap amount of the upper and lower mandibular tooth models.

4. The system for digitally displaying the misalignment between CR and ICP as claimed in claim 1, characterized in that: The tooth model shifting program module is specifically used to shift the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position, and the shifting process adopts interpolation method to shift step by step.

5. A method for digitally displaying the misalignment between CR and ICP, characterized in that: Applicable to the system for digitally displaying the misalignment between CR and ICP as claimed in any one of claims 1 to 4, the method comprising: Step 1: Import the upper and lower jaw tooth models in CR position; Step 2: Import the upper and lower jaw tooth models in the ICP position; Step 3: Using the maxillary tooth model at the CR position as a reference, align and overlap the maxillary tooth model at the ICP position with the maxillary tooth model at the CR position, and move the mandibular tooth model at the ICP position along with the maxillary tooth model; Step 4: Set the coordinates of the left and right condyle center points and the distances between the left and right condyle center points; Step 5: Rotate the mandibular tooth model in the CR position around the line connecting the center points of the left and right condyles to close the mouth, and stop when it collides with the maxillary tooth model; Step 6: Offset the mandibular tooth model that collides at the CR position to the mandibular tooth model position at the ICP position.

6. The method for digitally displaying the mismatch between CR and ICP as claimed in claim 5, characterized in that: In the step 1, step 2 and step 3, the CR bit and the ICP bit can be swapped.

7. The method for digitally displaying the mismatch between CR and ICP as claimed in claim 5, characterized in that: The step 4 may be performed before any of the previous steps.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to claims 5 to 7 is implemented.

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