A method and system for detecting interproximal spaces in the occlusal plane
By employing intraoral three-dimensional scanning technology and data processing methods, the problem of inaccurate detection of interproximal gap changes during occlusion has been solved, enabling quantitative detection of interproximal gaps and improving the accuracy and efficiency of detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PEKING UNIV SCHOOL OF STOMATOLOGY
- Filing Date
- 2023-07-13
- Publication Date
- 2026-04-28
AI Technical Summary
Existing technologies cannot accurately reflect the changing characteristics of the interproximal space between adjacent teeth during occlusion, resulting in inaccurate food impaction detection.
Data was acquired using intraoral 3D scanning technology, and the changes in adjacent areas before and after occlusion were extracted using a zone-line-point-line-zone data processing method. This included establishing a coordinate system, boundary extraction, data fitting, and point transformation, and calculating the changes in the gap between adjacent areas.
It achieves quantification and repeatability of interproximal zone gap detection, improves detection accuracy and efficiency, and can directly quantify changes in the interproximal zone before and after occlusion.
Smart Images
Figure CN116898619B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oral medicine technology, and more specifically to a method and system for detecting the interdental space during occlusion. Background Technology
[0002] Food impaction refers to the phenomenon where food gets wedged into the interdental spaces between adjacent teeth during chewing under the influence of occlusal forces. It often causes a range of oral diseases, including swelling and discomfort, interproximal caries, halitosis, gingivitis, and periodontitis. Studies show that the incidence of food impaction is over 90%, with the majority of affected individuals being between 40 and 59 years old. The most common location is between the first and second maxillary molars.
[0003] The root cause of food impaction is the formation of gaps in the interproximal contact area (i.e., the contact zone, the area where a tooth is in close contact with adjacent teeth within the same dental arch) between two adjacent teeth. Based on the temporal and spatial characteristics of this gap formation, it can be divided into static food impaction and (dynamic) close-contact food impaction. Static food impaction occurs when there is partial or no interproximal contact between the teeth in front of and behind the impactor in a non-occlusal state. Close-contact food impaction occurs when there is relatively normal interproximal contact between the teeth in front of and behind the impactor in a non-occlusal state (studies show that the gap width in the contact zone of healthy individuals is approximately <60µm), but food impaction results from a temporary separation of the interproximal contact area between the two teeth during chewing. This type of impaction accounts for approximately 71.4% of all food impactions. From a pathophysiological perspective, close-contact food impaction suggests that the size of the gap in the interproximal contact area between two adjacent teeth is dynamically changing during chewing.
[0004] Currently, the main methods for detecting changes in the interproximal space include: mandibular motion simulation systems, digital simulation mechanical... The frame obtains dynamic data on tooth contact states at each tooth position by simulating mandibular movement; the digital facebow transfers the maxillary model to a digital simulation. The frame is subjected to dynamic analysis of the biting contact to determine... The magnitude and direction of the force are important, but the simulation parameters involved in the chewing motion in the two studies above differ from the actual chewing motion data in the patient's mouth, and cannot truly reflect the changes in the interproximal space of the teeth before and after the impaction area during the occlusal process.
[0005] Therefore, improving the accuracy of detecting the changes in the adjacent areas of teeth before and after impaction during occlusion is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0006] In view of this, the present invention provides a method and system for detecting the gap between adjacent teeth during occlusion. It utilizes intraoral three-dimensional scanning technology for preliminary data acquisition, and then combines the data processing process of zone-line-point-line-zone to accurately extract the changes (range, position, etc.) of the adjacent areas of adjacent teeth before and after occlusion. It has the characteristics of quantification, repeatability, and objectivity.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] This invention provides a method for detecting the interdental space during occlusion, comprising the following steps:
[0009] Collect three-dimensional surface data of the crown and three-dimensional buccal occlusion data of the target tooth in the pre-occlusal impaction area of the test subject's mouth;
[0010] The three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional buccal occlusion data are processed to obtain the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area; the three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area are fused to obtain the interproximal space change characteristics of the target tooth in the impaction area before and after occlusion.
[0011] The change in the interproximal space of the impacted teeth before and after occlusion is calculated based on the characteristics of the change in the interproximal space of the impacted teeth before and after occlusion.
[0012] Preferably, the three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional buccal occlusion data are processed to obtain the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area; the three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area are fused to obtain the interproximal space change characteristics of the target tooth in the impaction area before and after occlusion; including:
[0013] Based on the first target tooth in the impaction area Establish a coordinate system on the plane;
[0014] Extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain the three-dimensional surface data of the single tooth surface of the first target tooth and the second target tooth in the pre-occlusal impaction area;
[0015] Clearly draw the boundary line of the adjacent area of the impacted tooth and copy the three-dimensional surface data of the single tooth of the first target tooth and the second target tooth;
[0016] Using the buccal occlusion data of the first target tooth and the second target tooth as the common area, buccal best-fit registration was performed to obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion.
[0017] The boundary lines of the adjacent areas in the three-dimensional data of the single tooth surfaces of the first and second target teeth in the pre-occlusal impaction area and the three-dimensional data of the single tooth surfaces of the first and second target teeth in the post-occlusal impaction area are converted into point data.
[0018] Obtain the movement of each point in the coordinate system at the boundary of the adjacent area of the first and second target teeth in the impaction zone before and after occlusion;
[0019] The variation characteristics of the adjacent area of the teeth in the impaction zone before and after occlusion are obtained by measuring the movement of each point in the coordinate system of the boundary of the first and second target teeth in the impaction zone before and after occlusion.
[0020] Preferably, the coordinate system uses the straight line connecting the midpoints of the mesial and distal marginal ridges of the first target tooth as the X-axis, and the first target tooth's... With the gingival direction as the Z-axis and the lingual-buccal or buccal-lingual direction as the Y-axis, the first target tooth... The center point of the surface is the origin.
[0021] Preferably, buccal best-fit registration is performed using the buccal occlusal data of the first target tooth and the second target tooth as the common area to obtain the single-tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion. This includes registration strategy one: when registering the first target tooth, the first target tooth is fixed and the buccal occlusal data is floated to ensure that the first target tooth does not move before and after occlusion; when registering the second target tooth, the buccal occlusal data is fixed and the copied second target tooth is floated. The data of the copied second target tooth after completing the buccal best-fit is the three-dimensional surface data of the second target tooth in the impaction area after occlusion.
[0022] Preferably, buccal best-fit registration is performed using the buccal occlusal data of the first target tooth and the second target tooth as the common area to obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion. It also includes a second registration approach: when registering the first target tooth and the second target tooth, the buccal occlusal data are fixed, and the first target tooth and the second target tooth are floated and copied. The data of the copied first target tooth and the copied second target tooth after completing the buccal best-fit are the three-dimensional surface data of the first and second target teeth after occlusion.
[0023] Preferably, in the registration approach one, the adjacent area boundary lines in the single-tooth surface three-dimensional data of the second target tooth in the pre-occlusal impaction area and the single-tooth surface three-dimensional data of the second target tooth in the post-occlusal impaction area are converted into point data, including:
[0024] The boundary lines of the adjacent areas of the second target tooth and the copied second target tooth are created as several points at a preset distance; the coordinate values and distances of the corresponding points on the boundary lines of the adjacent areas of the second target tooth before occlusion and the copied second target tooth after occlusion are calculated in the coordinate system; the distance difference of the corresponding points on the boundary lines of the adjacent areas of the second target tooth before and after occlusion and the distance changes on each coordinate axis are calculated; the distance difference of the corresponding points on the boundary lines of the adjacent areas of the second target tooth and the distance changes on each coordinate axis are the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion.
[0025] Preferably, in the second registration approach, the adjacent area boundary lines in the three-dimensional data of the single tooth surfaces of the first and second target teeth in the pre-occlusal impaction area and the three-dimensional data of the single tooth surfaces of the first and second target teeth in the post-occlusal impaction area are converted into point data, including:
[0026] The boundary lines of the adjacent areas of the first target tooth, the second target tooth, the copied first target tooth, and the copied second target tooth are created as several points at a preset distance. The coordinate values and distances of the corresponding points on the boundary lines of the first target tooth and the second target tooth before occlusion and on the boundary lines of the copied first target tooth and the copied second target tooth after occlusion are calculated in the coordinate system. Then, the distance difference between the corresponding points before and after occlusion and the distance change on each coordinate axis are calculated. The distance difference between the corresponding points before and after occlusion and the distance change on each coordinate axis are the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion.
[0027] On the other hand, the present invention provides a system for detecting the gap between adjacent teeth during occlusion, for implementing any of the above-mentioned methods for detecting the gap between adjacent teeth during occlusion, the detection system comprising: a data acquisition module and a processing module;
[0028] The acquisition module is used to acquire three-dimensional surface data of the crown of the target tooth in the patient's mouth and three-dimensional buccal occlusion data;
[0029] The processing module is used to process the three-dimensional surface data of the crown and the three-dimensional buccal occlusion data to obtain the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion; to fuse the three-dimensional surface data of the crown of the target tooth in the impaction area before occlusion and the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion to obtain the change characteristics of the adjacent area of the target tooth in the impaction area before and after occlusion, and to obtain the change of the adjacent area gap of the teeth in front and behind the impaction area and the teeth in front and behind the non-impaction area before and after occlusion.
[0030] Preferably, the acquisition module is a dental occlusal force tester and a dental 3D intraoral scanner. The dental occlusal force tester is used for training and measuring the occlusal force of the test subject, and the dental 3D intraoral scanner is used to scan and acquire the three-dimensional scanning data of the crowns of the upper and lower jaws of the target tooth in the three units in front of and behind the target tooth and the three-dimensional buccal occlusal data of the maximum cusp intersection position of the upper and lower jaws of the three units in front of and behind the target tooth.
[0031] Preferably, the processing module includes:
[0032] Coordinate system establishment unit: used for the first target tooth based on the impingement region. Establish a coordinate system on the plane;
[0033] Boundary extraction unit: used to extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the pre-occlusal impaction area;
[0034] Drawing unit: used to clearly draw the boundary line of the adjacent area between the first target tooth and the second target tooth in the impregnation area;
[0035] Copying unit: used to copy the first target tooth and the second target tooth;
[0036] Registration unit: used to perform buccal best fit registration with the buccal occlusal data of the first target tooth and the second target tooth as the common area, and obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion;
[0037] Line-to-point conversion unit: used to convert the boundary lines of the adjacent areas of the first and second target teeth in the pre-occlusal impaction zone and the first and second target teeth in the post-occlusal impaction zone into point data;
[0038] Change extraction unit: used to obtain the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion; based on the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion, the change characteristics of the gap between the adjacent areas of the impacted teeth in the coordinate system before and after occlusion are obtained.
[0039] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a method and system for detecting the interproximal space of teeth during occlusion. This method can directly and quantitatively detect the changes (range / position) of the interproximal spaces of all teeth before and after occlusion, improving detection efficiency. Furthermore, the present invention progressively decomposes the three-dimensional teeth into regions, lines, and points for detection. By progressively calculating the coordinates and distances of these points in this coordinate system before and after occlusion, from points to lines, and from lines to interproximal spaces, the changing trend of the target tooth's interproximal space during chewing is gradually clarified, improving detection accuracy. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0041] Figure 1 This is a flowchart illustrating the data processing procedure of the present invention.
[0042] Figure 2(a) is a 2D schematic diagram of the occlusal force distribution at the maximum intercuspal position of a certain tester; Figure 2(b) is a 3D schematic diagram of the occlusal force distribution at the maximum intercuspal position of a certain tester.
[0043] Figure 3(a) shows the three-dimensional scanning data of the crowns of the upper and lower jaws of the target tooth in the three units anterior and posterior to the target tooth of a test subject with 26.27 impaction; Figure 3(b) shows the three-dimensional buccal occlusion data of the upper and lower jaws of the target tooth in the three units anterior and posterior to the target tooth in the maximum cusp intersection position of the upper and lower jaws of a test subject with 26.27 impaction.
[0044] Figure 4(a) is a schematic diagram of the coordinate system established during the data processing process of the present invention; Figure 4(b) is a schematic diagram of the boundary of the target tooth extraction; Figure 4(c) is a schematic diagram of drawing the boundary line along the adjacent areas of the 26 distal and 27 mesial regions of the impregnation zone.
[0045] Figure 5(a) is a schematic diagram of the best fit on the buccal side in registration method one; Figure 5(b) is a schematic diagram of the data of distal tooth 27 in the impaction area after occlusion in registration method one; Figure 5(c) is a schematic diagram of the position of tooth 27 (light blue before occlusion, yellow after occlusion) relative to tooth 26 (purple) before and after occlusion in registration method one; Figure 5(d) is a schematic diagram of the curve of the boundary of the mesial adjoint area of tooth 27 before and after occlusion in registration method one; Figure 5(e) is a schematic diagram of the curve of the boundary of the mesial adjoint area of tooth 27 before and after occlusion extracted separately in registration method one.
[0046] Figure 5(f) is a schematic diagram of creating a certain number of points according to the distance of the two curves (before and after occlusion) in the first registration method; Figure 5(g) is a schematic diagram of calculating the distance of all created points on the two lines (before and after occlusion) in the first registration method.
[0047] Figure 6(a) is a schematic diagram of the best fit registration of the buccal sides of teeth 26 and 27 in registration strategy 2; Figure 6(b) is a schematic diagram of the post-occlusal data of teeth 26 and 27 in the impaction area in registration strategy 2; Figure 6(c) is a schematic diagram of the curves of the adjacent area boundaries of teeth 26 and 27 (green) before occlusion and teeth 26 and 27 (red) after occlusion in registration strategy 2; Figure 6(d) is a schematic diagram of creating a certain number of points according to the distance of the four curves (26 and 27 before occlusion and 26 and 27 after occlusion) in registration strategy 2; Figure 6(e) is a schematic diagram of the relative distance of the corresponding points of the adjacent area boundary lines of the two teeth (26 and 27) before occlusion (green) in registration strategy 2; Figure 6(f) is a schematic diagram of the relative distance of the corresponding points of the adjacent area boundary lines of the two teeth (26 and 27) after occlusion (red) in registration strategy 2.
[0048] Figure 7 A comparison diagram of the mesiodistal changes in the interproximal space of impacted and non-impacted teeth before and after occlusion. Detailed Implementation
[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0050] During chewing, teeth undergo slight rotation or torsion around the root under the elastic action of the periodontal ligament. This leads to changes in the interproximal space between adjacent teeth, such as further closure (mostly normal) or further opening (prone to food impaction in tightly packed areas). The interproximal space between adjacent natural teeth is only about 3–21 μm in the non-occlusal state. Without compromising the physiological strength of the interproximal space, it is impossible to directly obtain the complete morphology and position of the interproximal space of natural teeth intraorally, or observe the changes in the interproximal space during chewing. Based on the basic anatomical morphology of teeth, the incisor / The bottom of the outward gap is the top of the adjacent area; therefore, in this embodiment, the focal point is placed at the top of the adjacent area, i.e., the cut / The bottom of the abduction gap (can be obtained through intraoral scanning). After obtaining the target tooth through intraoral scanning, the top boundary of its adjacent area is plotted, and the three-dimensional deviation (distance change) of this boundary before and after occlusion is used to clarify the changes in the interproximal space (range, position, etc.) between the target tooth in the impacted area and the target tooth in the non-impacted area before and after occlusion.
[0051] This invention discloses a method for detecting the interdental space in the adjacent area of teeth during occlusion, comprising the following steps:
[0052] The three-dimensional surface data of the crown and the three-dimensional buccal occlusion data of the target tooth in the impaction area of the test subject's mouth are collected. The three-dimensional surface data of the crown refers to the three-dimensional scanning data of the crown of the target tooth in the upper and lower jaws of the three units in front and behind the target tooth in the test subject's mouth. The three-dimensional buccal occlusion data refers to the three-dimensional buccal occlusion data of the maximum cusp intersection of the upper and lower jaws of the target tooth in the three units in front and behind the target tooth in the test subject's mouth.
[0053] The specific data collection process includes:
[0054] The Teeteser bite force measuring instrument trains and measures the maximum intercuspal bite force of the subjects, and guides the subjects to perform the correct biting action to facilitate the subsequent collection of three-dimensional data of the target teeth in their mouths. The data obtained from the bite force training and measurement are shown in Figure 2(a)-Figure 2(b), which are 2D and 3D schematic diagrams of the maximum intercuspal bite force distribution of a certain test subject.
[0055] Aoralscan3 scanned the three-dimensional surface data of the target tooth in the upper and lower jaws, including the three units in front and behind, as well as the buccal occlusion data at the maximum cusp intersection position. (Previous studies have shown that the fewer units of the three-dimensional data in the intraoral scan, the higher the scanning accuracy. In order to ensure the integrity of the scanning data of the teeth in front and behind the impacted area, this embodiment ultimately decided to scan three units of data including the impacted tooth.) As shown in Figure 3(a) and Figure 3(b).
[0056] Save the intraoral 3D scan data as "stl" format and import it into Geomagic Studio 2013 software for data analysis and processing.
[0057] like Figure 1 As shown, the three-dimensional scan data is processed to obtain the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion; the three-dimensional surface data of the crown of the target tooth in the impaction area before occlusion and the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion are fused to obtain the changes in the adjacent area of the target tooth in the impaction area before and after occlusion; including:
[0058] Based on the first target tooth in the impaction area Establish a coordinate system on the plane;
[0059] Extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain the three-dimensional surface data of the single tooth surface of the first and second target teeth in the pre-occlusal impaction area;
[0060] Clearly draw the boundary line of the adjacent area of the impacted tooth and copy the three-dimensional surface data of the single tooth of the first target tooth and the second target tooth;
[0061] Using the buccal occlusal data of the first target tooth and the second target tooth as the common area, buccal best-fit registration was performed to obtain the single-tooth surface three-dimensional data of the first and second target teeth in the impaction area after occlusion.
[0062] The adjacent area boundary lines in the three-dimensional data of the single tooth surface of the first and second target teeth in the pre-occlusal impaction area and the three-dimensional data of the single tooth surface of the first and second target teeth in the post-occlusal impaction area are converted into point data.
[0063] Obtain the movement of each point in the coordinate system at the boundary of the first and second target teeth adjacent area in the impaction zone before and after occlusion;
[0064] The characteristics of the interdental gap change in the interdental space of the first and second target teeth in the impaction zone before and after occlusion are obtained by measuring the movement of each point in the coordinate system of the boundary of the first and second target teeth in the impaction zone before and after occlusion.
[0065] Preferably, the coordinate system uses the straight line connecting the midpoints of the mesial and distal marginal ridges of the first target tooth as the X-axis, and the first target tooth's... The gingival direction is the Z-axis, and the lingual-buccal or buccal-lingual direction is the Y-axis, with the first target tooth as the first target tooth. The center point of the surface is the origin.
[0066] Preferably, buccal best-fit registration is performed using the buccal occlusal data of the first and second target teeth as the common area to obtain the three-dimensional surface data of the impaction area after occlusion. Registration Approach 1: When registering the first target tooth, the first target tooth is fixed, and the buccal occlusal data is floated to ensure that the first target tooth remains stationary before and after occlusion; when registering the second target tooth, the buccal occlusal data is fixed, and the copied second target tooth is floated. The data of the copied second target tooth after buccal best-fit is used as the three-dimensional surface data of the second target tooth in the impaction area after occlusion. (This registration approach ensures that the first target tooth remains relatively stationary before and after occlusion.) Registration Approach 2: When registering both the first and second target teeth, the buccal occlusal data is fixed, and the copied first and second target teeth are floated. The data of the copied first and second target teeth after buccal best-fit are used as the three-dimensional surface data of the first and second target teeth after occlusion. (This registration approach causes both the first and second target teeth to move before and after occlusion.)
[0067] Preferably, the boundary lines of the adjacent areas in the three-dimensional surface data of the impacted teeth before occlusion and the three-dimensional surface data of the impacted teeth after occlusion are converted into point data. The specific processing of registration approach one is as follows: the boundary lines of the adjacent areas of the second target tooth and the copied second target tooth are created as several points at a preset distance (e.g., 0.5 mm); the coordinate values and distances of the corresponding points on the boundary lines of the adjacent areas of the second target tooth before occlusion and the copied second target tooth after occlusion are calculated in the coordinate system. The distance difference between the corresponding points before and after occlusion, as well as the changes in distance on each coordinate axis, represent the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion. The specific processing of registration approach two is as follows: Create several points along the boundary lines of the adjacent areas of the first target tooth, the second target tooth, the copied first target tooth, and the copied second target tooth at a preset distance (e.g., 0.5mm); calculate the coordinate values and distances of the corresponding points on the boundary lines of the first target tooth and the second target tooth before occlusion and on the boundary lines of the copied first target tooth and the copied second target tooth after occlusion in the coordinate system; then calculate the distance difference between the corresponding points before and after occlusion and the distance changes on each coordinate axis. The distance difference between the corresponding points before and after occlusion and the distance changes on each coordinate axis are the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion.
[0068] Example:
[0069] Taking the intraoral 3D scan data of a subject with close food impaction between the left upper first molar and left upper second molar (26, 27) as an example, this embodiment focuses on the data processing and analysis process, such as... Figures 4(a)-6(f) As shown.
[0070] Establish a coordinate system: based on tooth 26 in the mesial region of the impaction zone. The line connecting the midpoints of the near and far edge ridges of a plane. Establish a coordinate system based on the center point of the face (X-axis represents the mesial direction, Y-axis represents the lingual-buccal direction, Z-axis represents...). Gingival direction).
[0071] Extract the boundary lines of teeth 26 and 27, and separate and obtain the three-dimensional surface data of teeth 26 and 27 before occlusion.
[0072] Draw boundary lines along the adjacent areas of teeth 26 distally and 27 mesially in the impacted area, respectively. While ensuring that the data is a true and intuitive scan, draw the boundary lines as close as possible to the top boundary of the adjacent area. Then copy "26" and "27" to obtain "Copy 26" and "Copy 27".
[0073] Best-fit registration of buccal occlusion data: Using buccal occlusion data from samples 26 and 27 as a common region, best-fit registration was performed. Two registration approaches were used:
[0074] like Figures 5(a)-5(g) Approach 1: When registering “26”, fix the pre-occlusal data (“26”) and float the buccal occlusal data to ensure that 26 remains unchanged before and after occlusion; when registering “27”, fix the buccal occlusal data and float the pre-occlusal data (“copy 27”). After registration, “27” is the pre-occlusal data and “copy 27” is the post-occlusal data.
[0075] like Figures 6(a)-6(f) Approach 2: When registering “26” and “27”, fix the buccal occlusal data and float the pre-occlusal data (“copy 26”, “copy 27”). After registration, “26” and “27” are the pre-occlusal data, and “copy 26” and “copy 27” become the post-occlusal data.
[0076] Analysis of the changes in the adjacent areas of impacted teeth before and after occlusion:
[0077] The analysis method for registration approach one is as follows: Two curves on teeth "27" and "copy 27" are created as a certain number of points at a preset distance (e.g., 0.5mm). The coordinate values and distances of these points in the established coordinate system are analyzed. Ultimately, the change in the distance of the same point before and after occlusion represents the change in the same line before and after occlusion, and ultimately represents the change in the interproximal space of the teeth before and after occlusion (the amount of change in each direction, position, and the span of buccal-lingual change, etc.).
[0078] The analysis method of registration approach two is as follows: Create a certain number of points on the four curves of the four teeth "26", "27" and "copy 26", "copy 27" according to a preset distance (e.g., 0.5mm). Calculate the coordinate values and distances of the points on the curves of teeth "26" and "27" before and after occlusion in the established coordinate system. Then calculate the distance difference before and after occlusion and the distance changes on each coordinate axis. This ultimately represents the changes in the adjacent area of the teeth before and after occlusion (the amount of change in each direction, position, and the span of buccal-lingual change, etc.).
[0079] Figure 7 A comparison diagram of the mesiodistal changes in the interproximal space of impacted and non-impacted teeth before and after occlusion.
[0080] A system for detecting the interproximal space of teeth during occlusion, used to implement any of the above-mentioned methods for detecting the interproximal space of teeth during occlusion, the detection system includes: a data acquisition module and a processing module;
[0081] The acquisition module is used to acquire three-dimensional surface data of the crown of the target tooth in the patient's mouth and three-dimensional buccal occlusion data;
[0082] The processing module is used to process the three-dimensional surface data of the crown and the three-dimensional buccal occlusion data to obtain the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion; to fuse the three-dimensional surface data of the crown of the target tooth in the impaction area before occlusion and the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion to obtain the interproximal change characteristics of the target tooth in the impaction area before and after occlusion, and to obtain the changes in the interproximal space of the teeth in front and behind the impaction area and the teeth in front and behind the non-impaction area before and after occlusion (the amount of change in each direction, the position, and the buccal-lingual change span, etc.).
[0083] Preferably, the data acquisition module includes: a dental occlusal force tester and a dental 3D intraoral scanner. The former is used for training and measuring the occlusal force of the tester; the latter is used to scan and acquire the three-dimensional scanning data of the crowns of the upper and lower jaws of the target tooth in the three units in front of and behind the target tooth and the three-dimensional buccal occlusal data of the maximum cusp intersection of the upper and lower jaws of the three units in front of and behind the target tooth.
[0084] Preferably, the processing module includes:
[0085] Coordinate system establishment unit: used for the first target tooth based on the impingement region. Establish a coordinate system on the plane;
[0086] Boundary extraction unit: used to extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain three-dimensional data of the single tooth surface of the first and second target teeth in the pre-occlusal impaction area;
[0087] Drawing unit: used to clearly draw the boundary line of the adjacent area between the first target tooth and the second target tooth in the impregnation area;
[0088] Copying unit: used to copy the first target tooth and the second target tooth;
[0089] Registration unit: used to perform buccal best fit registration with the buccal occlusal data of the first target tooth and the second target tooth as the common area, and obtain the single tooth surface three-dimensional data of the first and second target teeth in the impaction area after occlusion;
[0090] Line-to-point conversion unit: used to convert the boundary lines of the adjacent areas of the first and second target teeth in the pre-occlusal impaction zone and the first and second target teeth in the post-occlusal impaction zone into point data;
[0091] Change extraction unit: used to obtain the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion; based on the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion, the change characteristics of the gap between the adjacent areas of the impacted teeth in the coordinate system before and after occlusion are obtained.
[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0093] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for detecting the interdental space in the contact area of adjacent teeth during occlusion, characterized in that, Includes the following steps: Collect three-dimensional surface data of the crown and three-dimensional buccal occlusion data of the target tooth in the pre-occlusal impaction area of the test subject's mouth; The three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional buccal occlusion data are processed to obtain the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area; the three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area are fused to obtain the interproximal space change characteristics of the target tooth in the impaction area before and after occlusion. The change in the interproximal space of the impacted teeth before and after occlusion is calculated based on the characteristics of the change in the interproximal space of the impacted teeth before and after occlusion. The three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional buccal occlusion data are processed to obtain the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area; the three-dimensional surface data of the crown of the target tooth in the pre-occlusal impaction area and the three-dimensional surface data of the crown of the target tooth in the post-occlusal impaction area are fused to obtain the interproximal space change characteristics of the target tooth in the impaction area before and after occlusion; including: Based on the first target tooth in the impaction area Establish a coordinate system on the plane; Extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain the three-dimensional surface data of the single tooth surface of the first target tooth and the second target tooth in the pre-occlusal impaction area; Clearly draw the boundary line of the adjacent area of the impacted tooth and copy the three-dimensional surface data of the single tooth of the first target tooth and the second target tooth; Using the buccal occlusion data of the first target tooth and the second target tooth as the common area, buccal best-fit registration was performed to obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion. The boundary lines of the adjacent areas in the three-dimensional data of the single tooth surfaces of the first and second target teeth in the pre-occlusal impaction area and the three-dimensional data of the single tooth surfaces of the first and second target teeth in the post-occlusal impaction area are converted into point data. Obtain the movement of each point in the coordinate system at the boundary of the adjacent area of the first and second target teeth in the impaction zone before and after occlusion; The variation characteristics of the adjacent area of the teeth in the impaction zone before and after occlusion are obtained by measuring the movement of each point in the coordinate system of the boundary of the adjacent area of the first and second target teeth in the impaction zone before and after occlusion.
2. The method for detecting the interdental space during occlusion as described in claim 1, characterized in that, The coordinate system uses the straight line connecting the midpoints of the mesial and distal marginal ridges of the first target tooth as the X-axis, and the first target tooth... With the gingival direction as the Z-axis and the lingual-buccal or buccal-lingual direction as the Y-axis, the first target tooth... The center point of the surface is the origin.
3. The method for detecting the interdental space during occlusion as described in claim 1, characterized in that, Using the buccal occlusal data of the first target tooth and the second target tooth as the common area, buccal best-fit registration is performed to obtain the single-tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion. This includes: when registering the first target tooth, fixing the first target tooth and floating the buccal occlusal data to ensure that the first target tooth does not move before and after occlusion; when registering the second target tooth, fixing the buccal occlusal data and floating the copied second target tooth. The data of the copied second target tooth after completing the buccal best-fit is the three-dimensional surface data of the second target tooth in the impaction area after occlusion.
4. The method for detecting the interdental space during occlusion as described in claim 1, characterized in that, Using the buccal occlusal data of the first target tooth and the second target tooth as the common area, buccal best-fit registration is performed to obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion. It also includes: when registering the first target tooth and the second target tooth, the buccal occlusal data are fixed, and the first target tooth and the second target tooth are floated and copied. The data of the copied first target tooth and the copied second tooth after completing the buccal best-fit are the three-dimensional surface data of the first and second target teeth after occlusion.
5. The method for detecting the interdental space during occlusion as described in claim 3, characterized in that, The adjoint boundary lines in the three-dimensional data of the single tooth surface of the second target tooth in the pre-occlusal impaction area and the three-dimensional data of the single tooth surface of the second target tooth in the post-occlusal impaction area are converted into point data, including: The boundary lines of the adjacent areas of the second target tooth and the copied second target tooth are created as several points at a preset distance; the coordinate values and distances of the corresponding points on the boundary lines of the adjacent areas of the second target tooth before occlusion and the copied second target tooth after occlusion are calculated in the coordinate system; the distance difference of the corresponding points on the boundary lines of the adjacent areas of the second target tooth before and after occlusion and the distance changes on each coordinate axis are calculated; the distance difference of the corresponding points on the boundary lines of the adjacent areas of the second target tooth and the distance changes on each coordinate axis are the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion.
6. The method for detecting the interdental space during occlusion as described in claim 4, characterized in that, The adjoint boundary lines in the single-tooth surface three-dimensional data of the first and second target teeth in the pre-occlusal impaction area and the single-tooth surface three-dimensional data of the first and second target teeth in the post-occlusal impaction area are converted into point data, including: The boundary lines of the adjacent areas of the first target tooth, the second target tooth, the copied first target tooth, and the copied second target tooth are created as several points at a preset distance. The coordinate values and distances of the corresponding points on the boundary lines of the first target tooth and the second target tooth before occlusion and on the boundary lines of the copied first target tooth and the copied second target tooth after occlusion are calculated in the coordinate system. Then, the distance difference between the corresponding points before and after occlusion and the distance change on each coordinate axis are calculated. The distance difference between the corresponding points before and after occlusion and the distance change on each coordinate axis are the characteristics of the change in the gap between the adjacent areas of the impacted teeth before and after occlusion.
7. A system for detecting the interdental space during occlusion, characterized in that, For implementing a method for detecting the interdental space during occlusion as described in any one of claims 1-6, the detection system includes: a data acquisition module and a processing module; The acquisition module is used to acquire three-dimensional surface data of the crown of the target tooth in the patient's mouth and three-dimensional buccal occlusion data; The processing module is used to process the three-dimensional surface data of the crown and the three-dimensional buccal occlusion data to obtain the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion; and to fuse the three-dimensional surface data of the crown of the target tooth in the impaction area before occlusion and the three-dimensional surface data of the crown of the target tooth in the impaction area after occlusion to obtain the adjacent area change characteristics of the target tooth in the impaction area before and after occlusion. The processing module includes: Coordinate system establishment unit: used for the first target tooth based on the impingement region. Establish a coordinate system on the plane; Boundary extraction unit: used to extract the boundary between the first target tooth and the second target tooth, separate the first target tooth and the second target tooth, and obtain three-dimensional data of the single tooth surface of the first target tooth and the second target tooth in the pre-occlusal impaction area; Drawing unit: used to clearly draw the boundary line of the adjacent area between the first target tooth and the second target tooth in the impregnation area; Copying unit: used to copy the first target tooth and the second target tooth; Registration unit: used to perform buccal best fit registration with the buccal occlusal data of the first target tooth and the second target tooth as the common area, and obtain the single tooth surface three-dimensional data of the first target tooth and the second target tooth in the impaction area after occlusion; Line-to-point conversion unit: used to convert the boundary lines of the adjacent areas of the first and second target teeth in the pre-occlusal impaction zone and the first and second target teeth in the post-occlusal impaction zone into point data; Change extraction unit: used to obtain the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion; based on the movement of each point of the boundary of the adjacent area of the impacted teeth in the coordinate system before and after occlusion, the change characteristics of the gap between the adjacent areas of the impacted teeth in the coordinate system before and after occlusion are obtained.
8. A system for detecting the interproximal space of teeth during occlusion according to claim 7, characterized in that, The acquisition module consists of a dental occlusal force tester and a dental 3D intraoral scanner. The dental occlusal force tester is used for training and measuring the occlusal force of the test subject. The dental 3D intraoral scanner is used to scan and acquire the three-dimensional scanning data of the crowns of the upper and lower jaws of the target tooth in the three units in front of and behind the target tooth, and the three-dimensional buccal occlusal data of the maximum cusp intersection position of the upper and lower jaws of the three units in front of and behind the target tooth.