KR20110135322A - Imaginary overlay apparatus and method for dental treatment - Google Patents

Abstract

PURPOSE: A virtual overlapping device for dental treatment and a method thereof are provided to perform a simulation in dental treatment diagnosis. CONSTITUTION: A virtual overlapping device for dental treatment comprises: a data loading part(110) for loading three-dimensional tooth model in the direction of a two-dimensional tooth image; a value measuring unit(120) for measuring inclination angle and length by using a reference point on the two-dimensional tooth image and three-dimensional tooth model; and a virtual overlap unit(130) which adjusts the tilt angle of three-dimensional tooth model according to the tilt angle of two-dimensional tooth image and adjusts the size and location of two-dimensional tooth image according to the length of a three-dimensional radiation image.

Description

Dental superimposition device and its method {IMAGINARY OVERLAY APPARATUS AND METHOD FOR DENTAL TREATMENT}

The present invention relates to a virtual superimposition device for dental treatment and a method thereof, and more particularly, to a three-dimensional teeth after virtually overlapping the inclination angle, size and position with respect to the side and front of the two-dimensional teeth image and the three-dimensional teeth model A virtual superimposition device for dental treatment and its method, and a computer readable and computer-readable method for performing the method, for providing a user interface environment for dental treatment diagnosis by proceeding virtual superposition of the upper surface through rotation of the model. A program storage device for tangibly embodying a program of instructions executable by a computer.

In general, the teeth (齒 列) is made of a structure that can chew food while the upper and lower teeth are occluded according to the jaw joint movement. At this time, the teeth are uneven, so the upper and lower teeth occlusion is referred to as 'negative occlusion'.

These malocclusions include dislocations with abnormal tooth position, difficulty with uneven teeth, opening with molar teeth or incisors, and upper teeth, especially lower teeth Malocclusion due to denial of teeth, such as overdose with a significant degree of covering, interdental gap with open side teeth, and low bite occlusion where a specific tooth gets stuck in the side teeth. Skeletal malocclusion due to abnormal growth of the upper jaw (upper jaw) and lower jaw (lower jaw).

In particular, in the case of skeletal malocclusion, the teeth of the upper and lower teeth are difficult to chew or bite, as well as the pronunciation is strange, and the face is distorted and asymmetrical, in severe cases may change the face shape to the spatula or jaw.

For these reasons, malocclusion requires proper treatment to make normal occlusion. Treatment of malocclusion depends on the patient's age, jawbone and oral condition, and uses various devices such as removable orthodontic appliances. Accordingly, most dentists go through the following process to treat malocclusion. First, the dentist conducts an interview with the patient and takes a dental x-ray of the patient to observe the root state of the tooth and the health of the gum. Next, the dentist measures and analyzes the patient's maxillofacial radiograph and gypsum model to diagnose and plan a treatment. Afterwards, the dentist selects an appropriate orthodontic device and applies it to the patient for a certain period of time, and then removes the orthodontic device.

However, in the case of skeletal malocclusion, dental correction is performed. Here, the corrective surgery is a procedure to correct the skeletal abnormalities of the teeth and face parts to create a functional and aesthetic face. The orthodontic treatment is applied to the patient by making the orthodontic device between the upper model and the lower model modeled after the upper and lower teeth of the patient. At this time, the orthodontic device is manufactured in accordance with the tooth arrangement in the state of the upper model and lower model imitating the teeth.

However, if the orthodontic treatment is not successful, perform an orthodontic surgery. Such orthodontic surgery is difficult to fix some incision jawbone (upper jaw bone or part of the lower jaw bone) in the right position, using the patient's dental gypsum model to predict and cut the operation after surgery to achieve the target position.

In conventional orthodontic surgery, a composite (ie, resin) is filled between the upper and lower teeth spaces to produce a mold having a horseshoe-shaped tooth shape like a mouthpiece (hereinafter referred to as a "wafer"). The wafer thus prepared is fixed to the teeth of the jaws that are not cut during surgery, and the teeth of the cut jaw bone are aligned to obtain a desired position. At this time, the wafer holding the position of the maxilla is called an 'intermediate wafer' and the wafer holding the position of the mandible is called a 'final wafer'.

Conventionally, a wafer was manufactured by hand using a gypsum model in order to manufacture a wafer required for an orthodontic surgery. As described above, since the wafer is manufactured by using a plaster model by hand, the manufacturing process is complicated and there is a possibility that a large number of errors exist in each process.

Hereinafter, a conventional wafer fabrication process will be described with reference to FIGS. 1 to 5.

1 is a view for explaining a state in which the face beam is inserted into the oral cavity of the patient, Figure 2 is a view for explaining the plaster model, Figure 3 is a view for explaining the articulator.

As an example of wafer fabrication, skull cephalometrics using two-dimensional teeth images are used to obtain a two-dimensional teeth image of a patient to roughly grasp the state of malocclusion. In other words, the upper and lower asymmetry is identified using the side photograph of the radiographic image, and the left and right asymmetry is identified using the front photograph.

When the state of malocclusion is determined using a radiographic image, a face bow 11 shown in FIG. 1 may be used to obtain a relative three-dimensional position of a patient's teeth and a skull. In this case, the face beam 11 is used to obtain a negative dental frame by leaving the marks of teeth generated when the patient bites on the steel plate inserted into the mouth of the patient. Thereafter, as shown in FIG. 2, the dental model of the patient is made of plaster to obtain a plaster model 12.

In addition, by using the articulator (13) shown in Figure 3 to fasten the face beam 11 including the negative tooth frame having a mark of the teeth to the articulator 13 and the maxillary plaster model (13a) and the mandibular plaster model Mount (13b).

The articulator 13 is a mechanism for implementing a man's jaw joint movement based on a frankfort horizontal plane, and reproduces the jaw movement using a plaster model. That is, the articulator 13 can reproduce jaw motion as if it were a negative tooth frame, that is, a wafer having tooth marks disposed between the plaster models of the maxillary and mandibular teeth.

However, in the conventional method, an error of the face beam 11 itself, an error in reproducing the articulator 13, an error in the articulator 13, and the like may exist during the process described above, and may be analyzed by a subjective judgment of a doctor. This leaves room for error.

4 and 5 are views for explaining a gypsum model is completed virtual surgery, Figure 7 is a view showing a completed wafer.

Referring to FIG. 4, after confirming the jaw movement reproduced by the articulator 13, the reference point 15 is marked on the plaster model for virtual surgery using the plaster model. The gypsum models 13a and 13b having completed the measurement are cut along the marking line and virtually operated according to the surgical plan, and then fixed using wax 14.

The gypsum models 13a and 13b having the virtual surgery completed have a space 16 between the maxillary 13a and the gypsum model teeth of the mandible 13b.

As shown in FIG. 5, the composite material (resin: 17) is filled into the space 16 and hardened.

This completes the fabrication of the wafer 18, which is the tooth frame of the tooth for the actual surgery shown in FIG.

This wafer is used as a model to remember the position of the teeth during orthodontic surgery to play an important role in fixing the teeth of the jaw portion that is not incision during surgery and to match the teeth of the incision jaw bone to find the desired position.

Since the wafer manufactured by the conventional manufacturing method is manufactured by virtual surgery using a gypsum model, the wafer is difficult to be manufactured by the subjective judgment of the doctor, and as mentioned above, it is possible to exclude the possibility that there are many errors in each process. none.

In addition, since the face beam and articulator and the plaster model must be used, the manufacturing process is complicated and the manufacturing cost is high.

Therefore, there is a need for a wafer fabrication method that can provide high precision without relying on manual labor.

Therefore, the prior art as described above has a problem that it is difficult to perform simulation in the diagnosis of dental treatment as well as complicated manufacturing process and high manufacturing cost by realizing the actual tooth structure of the patient using a face beam, agitator and a plaster model. In order to solve this problem, it is an object of the present invention.

Accordingly, the present invention virtually overlaps the inclination angle, size and position of the two-dimensional teeth image and the side and front of the three-dimensional teeth model, and then proceeds to the virtual superposition of the upper surface through the rotation of the three-dimensional teeth model to diagnose the dental treatment A virtual superimposition device and method for providing dental user interface environment, and a program storage device for tangibly embodying a program of instructions readable by a computer and executable by the computer for executing the method. The purpose is to provide.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the virtual superimposition device of the present invention, the data loading unit for loading by overlaying the three-dimensional teeth model in accordance with the photographing direction of the two-dimensional teeth image; A numerical measuring unit for measuring an inclination angle and a length by using reference points respectively selected by the user on the two-dimensional tooth image and the three-dimensional tooth model; And a virtual superimposition unit for adjusting the inclination angle of the three-dimensional teeth model according to the inclination angle of the two-dimensional teeth image and adjusting and overlapping the size and position of the two-dimensional teeth image according to the length of the three-dimensional radiographic image. It includes;

In addition, the virtual superimposition device of the present invention further comprises a user interface for identifying the two-dimensional teeth image and the three-dimensional teeth model, to provide an interface for selecting the reference point.

In addition, the virtual superimposition apparatus of claim 1, further comprising a storage unit for storing the two-dimensional teeth image and the three-dimensional teeth model obtained from the outside for each patient.

The two-dimensional tooth image includes a side image and a front image, wherein the three-dimensional tooth model is characterized in that it comprises a XY plane of the anatomical sagittal plane and a YZ plane of the coronal plane by setting the coordinate system of the three-dimensional space .

The data loading unit may load the X-Y plane corresponding to the side image when the side image and the Y-Z plane corresponding to the front image when the front image.

The numerical measuring unit may measure an inclination angle and a length of a line segment between at least two reference points selected at the same point by the user in the occlusal surface of the 2D dental image and the 3D dental model.

The virtual overlapping part is characterized in that the front image and the Y-Z plane virtually overlap each other, and then rotates the Y-axis with respect to the Y-Z plane to the rotation axis to adjust the position.

The virtual superimposing unit corrects an error of the size of the two-dimensional dental image by using a reference scale on the two-dimensional dental image after the virtual superposition is completed.

The virtual overlapping part may be configured to implement a state in which the virtual articulator is coupled by overlapping the hinge axis of the tracing and the rotation axis of the virtual articulator in the side image.

The user interface unit may provide an input function and an output function to a user to perform a virtual overlapping operation.

On the other hand, the virtual superposition method of the present invention, the loading step of loading a three-dimensional teeth model according to the direction of the two-dimensional teeth image; And adjusting and inclining angles, sizes, and positions of the two-dimensional teeth image and the three-dimensional teeth model by using reference points selected by the user on the two-dimensional teeth image and the three-dimensional teeth model, respectively. Superimposing step.

The two-dimensional tooth image includes a side image and a front image, wherein the three-dimensional tooth model is characterized in that it comprises a XY plane of the anatomical sagittal plane and a YZ plane of the coronal plane by setting the coordinate system of the three-dimensional space .

The loading step may include loading the X-Y plane corresponding to the side image when the side image and loading the Y-Z plane corresponding to the front image when the front image.

The virtual overlapping step may include: measuring an inclination angle of a line segment between at least two reference points selected at the same point in sequence by the user in the occlusal surface of the two-dimensional dental image and the three-dimensional dental model; Adjusting the inclination angle of the three-dimensional tooth model according to the inclination angle of the line segment of the two-dimensional tooth image; Measuring a length of a line segment between at least two reference points sequentially reselected by the user at the same point in the occlusal surface of the three-dimensional tooth model and the two-dimensional tooth image; And adjusting the size and position of the 2D dental image according to the length of the line segment of the 3D dental model.

The virtual overlapping step may include adjusting the position by virtually overlapping the front image and the Y-Z plane and then rotating the Y axis with respect to the Y-Z plane by a rotation axis.

The virtual overlapping method of the present invention may further include providing a user interface environment for diagnosing a virtual treatment after the virtual overlapping of the 2D dental image and the 3D dental model is completed.

On the other hand, the present invention is a program storage device for tangibly embodying a program of instructions that are computer readable and executable by a computer to execute a virtual superimposition method for dental treatment, the method comprising: Loading a three-dimensional tooth model according to a photographing direction; And superimposing the two-dimensional teeth image and the three-dimensional teeth model by adjusting a tilt angle, a size, and a position of the two-dimensional teeth image and the three-dimensional teeth model, respectively, by using reference points selected by the user. It includes a program storage device characterized in that it comprises a.

As described above, the present invention virtually overlaps the inclination angle, size and position of the two-dimensional teeth image and the side and front of the three-dimensional teeth model, and then proceed to the virtual overlap on the upper surface through the rotation of the three-dimensional teeth model It is effective to provide a user interface environment for dental treatment diagnosis.

In addition, the present invention by replacing the series of processes coupled to the stirrer to the stirrer for the fabrication of the surgical wafer with a virtual overlap function, it is effective to perform the work without the time, cost and manpower required for actual work have.

1 is a view for explaining a state in which the face beam is inserted into the mouth of the patient,
2 is a view for explaining a plaster model,
3 is a view for explaining the articulator,
4 and 5 is a view for explaining a plaster model that the virtual surgery is completed,
6 shows a completed wafer;
7 is a block diagram of a virtual overlapping device for dental treatment according to an embodiment of the present invention,
Figure 8a is a view showing a side image of the two-dimensional teeth image,
Figure 8b is a view showing a front image of the two-dimensional teeth image,
Figure 9a is a view showing the XY plane of the three-dimensional teeth model,
Figure 9b is a view showing the XZ plane of the three-dimensional teeth model,
Figure 9c is a view showing the YZ plane of the three-dimensional teeth model,
10A is a view showing a loading state of the XY plane of the side image and the three-dimensional tooth model of the two-dimensional teeth image,
10b is a view showing a loading state of the front image of the two-dimensional teeth image and the YZ plane of the three-dimensional teeth model,
Figure 11a is a view showing the reference point selection in the side image of the two-dimensional teeth image,
11b is a view showing the reference point selection in the XY plane of the three-dimensional teeth model,
12A and 12B are diagrams for a virtual overlapping operation of the XY plane of the side image of the two-dimensional tooth image and the three-dimensional tooth model;
13A and 13B are diagrams of a virtual overlapping operation of the YZ plane of the front image of the two-dimensional tooth image and the three-dimensional tooth model;
14A and 14B are diagrams of a virtual overlapping operation using Y-axis rotation with respect to the YZ plane of the three-dimensional tooth model.
15a and 15b is a view of the error correction operation for the size of the two-dimensional teeth image,
16A and 16B are diagrams illustrating a state in which a virtual articulator is combined after superposing a two-dimensional dental image and a three-dimensional dental model;
17 is a flowchart illustrating a virtual superimposition method for dental treatment according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

7 is a block diagram of a virtual superimposition device for dental treatment according to an embodiment of the present invention. Figure 8a is a view showing a side image of the two-dimensional teeth image, Figure 8b is a view showing a front image of the two-dimensional teeth image. Figure 9a is a view showing the X-Y plane of the three-dimensional teeth model, Figure 9b is a view showing the X-Z plane of the three-dimensional teeth model, Figure 9c is a view showing the Y-Z plane of the three-dimensional teeth model. Figure 10a is a view showing the loading state of the side image of the two-dimensional teeth image and the XY plane of the three-dimensional teeth model, Figure 10b is a loading state of the front image of the two-dimensional teeth image and the YZ plane of the three-dimensional teeth model The figure shown. FIG. 11A illustrates reference point selection in a side image of a 2D tooth image, and FIG. 11B illustrates reference point selection in an X-Y plane of a 3D tooth model. 12A and 12B are diagrams of a virtual overlapping operation for the X-Y plane of the side image of the two-dimensional teeth image and the three-dimensional teeth model. 13A and 13B are diagrams of a virtual overlapping operation on the Y-Z plane of the front image of the two-dimensional tooth image and the three-dimensional tooth model. 14A and 14B are diagrams of a virtual overlapping operation using Y-axis rotation about the Y-Z plane of the three-dimensional tooth model. 15A and 15B are diagrams illustrating an error correction operation on the size of a two-dimensional tooth image. 16A and 16B are diagrams illustrating a state where a virtual articulator is coupled after a two-dimensional dental image and a three-dimensional dental model are superimposed.

The general mounting operation is called face bow transfer, which involves creating a plaster model that mimics the patient's teeth prior to surgery and then cuts the plaster model and places it on the articulator as needed. do. However, this overlapping work must be performed again in the above-described series of work if the fabrication work is performed incorrectly when performing the base work on the plaster model.

In contrast, a dental superimposition device (hereinafter, referred to as a "virtual superimposition device", 100) according to an embodiment of the present invention combines a dental model obtained from a patient with an articulator to actually implement the patient's oral posture. Reproduce nested work in virtual space to provide a user interface environment for performing a series of virtual nested work.

At this time, the virtual superimposition device 100 obtains a two-dimensional teeth image of the head of the patient and a three-dimensional teeth model of the upper and lower teeth of the patient, respectively, and then two-dimensional three-dimensional tooth model in the virtual space Overlaid on the tooth image to reproduce the superimposed state in the actual situation. That is, the virtual superposition apparatus 100 positions the two-dimensional teeth image on the lower layer, the three-dimensional teeth model on the upper layer, and overlays the corresponding ones.

Here, the two-dimensional teeth image means a radiographic image of the head of the patient taken through a dental X-ray or a computed tomography (CT) according to the cephalometrics (Fig. 8a and 8b). At this time, the two-dimensional tooth image is a lateral cephalogram (200a) taken from the side of the patient's head in accordance with the shooting direction (hereinafter referred to as "lateral image", 200a), the head of the head radiograph taken from the forward direction of the patient ( posteroanterior cephalogram, hereinafter referred to as "front image" (200b), and submental cephalogram (viewed as "top image") taken from the top of the patient's head.

The two-dimensional teeth image is transmitted to the subject by forming the X-rays through the object to form a film appears as the distance between the film and the subject is enlarged. That is, the two-dimensional teeth image may have some error compared to the actual size of the patient's head.

However, the two-dimensional tooth image can grasp the actual tooth structure of the patient by reflecting the actual facial skeletal structure of the patient's head as it is. In other words, in the present invention, instead of the process of checking the relative position of the patient's teeth and the skull through the face beam and the bite fork to check the actual patient's tooth structure, the teeth required for the virtual superposition through the two-dimensional tooth image Check the canting of. Here, the inclination angle of the tooth can be confirmed through the inclination of the occlusal surface, which is the tooth surface in contact with each other between the upper teeth and the lower teeth in the two-dimensional teeth image.

In addition, the 3D tooth model refers to 3D tooth shape data that implements a 3D tooth shape having a volume and texture similar to that of a real patient in a virtual space through rendering (see FIGS. 9A to 9C). . In this case, the 3D dental model may acquire 3D tooth shape data through a 3D scanner of a plaster model that shapes the teeth of a patient, or may obtain 3D tooth shape data through a conventional dental computed tomography. Since the method of obtaining the 3D tooth model is easily understood by those skilled in the art, a detailed description thereof will be omitted.

The three-dimensional tooth model is modeling data of actual size corresponding to one-to-one (1: 1) of the patient's actual tooth, and the actual tooth of the patient is implemented in the virtual space as it is. However, the three-dimensional tooth model is the same as the actual size of the patient's actual tooth only does not reflect the angle of inclination of the tooth.

In this case, a coordinate system for quantification of measurement in a three-dimensional space is set in the three-dimensional dental model. That is, the XY plane 300a is anatomically a sagittal plane, determined by the midpalatal suture 301 and the junction of the incisive papilla and midpalatal suture 302 (FIG. 9A). Reference). Here, the medial palatal suture 301 is an anatomical structure showing a central line that divides the left and right symmetry of the palate of the maxilla, and the PMRJ 302 is an incisive papilla 303 and the medial palatal suture 301. ) Is a protruding gum tissue on the left and right symmetric center line of the anterior palate. In addition, the X-Z plane 300b is anatomically determined as a frankfort horizontal plane, and is determined to be a plane perpendicular to the X-Y plane 300a including the PMRJ 302 (see FIG. 9B). In addition, the Y-Z plane 300c is anatomically determined as a coronal plane, which is a plane perpendicular to the X-Y plane 300a and the X-Z plane 300b including the PMRJ 302 (see FIG. 9C).

Specifically, the virtual superposition device 100 overlaps the two-dimensional teeth image and the three-dimensional teeth model as follows.

That is, the virtual superimposition apparatus 100 according to the occlusal inclination angle confirmed through the side image 200a of the two-dimensional teeth image, the inclination angle of the X axis in the XY plane 300a (ie, the sagittal plane) of the three-dimensional teeth model. After adjusting, the size and position of the side image 200a of the 2D dental image are adjusted to the size and position of the XY plane 300a of the 3D dental model. Similarly, the virtual superimposition apparatus 100 according to the occlusal inclination angle confirmed through the front image 200b of the two-dimensional teeth image, the inclination angle of the Z axis in the YZ plane 300c (ie, the coronal plane) of the three-dimensional teeth model. After adjusting, the size and position of the front image 200b of the 2D dental image are adjusted to the size and position of the YZ plane 300c of the 3D dental model. However, the virtual superimposition apparatus 100 corresponds to the superimposed image of the two-dimensional teeth image on the XZ plane 300b (that is, the Frankfort surface) of the three-dimensional teeth model and overlaps the above-described process. Instead of proceeding separately, the process of reflecting the degree of rotation is made by using the Y axis (that is, the midpoint of the two front teeth) as the rotation axis in the XY plane 300a of the 3D tooth model.

As shown in FIG. 7, the virtual overlapping apparatus 100 includes a data loading unit 110, a numerical measuring unit 120, a virtual overlapping unit 130, a user interface unit 140, and a storage unit 150. do.

The data loading unit 110 overlays the two-dimensional tooth image on the lower layer and the three-dimensional tooth model on the upper layer and displays the same through the user interface unit 140 (see FIGS. 10A and 10B).

Specifically, the data loading unit 110 loads a two-dimensional dental image (ie, the side image 200a or the front image 200b) according to the user's photographing direction selection. In addition, the data loading unit 110 loads a three-dimensional teeth model (that is, XY plane 300a or YZ plane 300c), it is preferable to load corresponding to the shooting direction of the two-dimensional teeth image selected by the user. Do.

That is, the data loading unit 110 displays and loads the XY plane 300a of the 3D dental model when the side image 200a of the 2D dental image is loaded, and the front image 200b of the 2D dental image. If is loaded, the YZ plane (300c) of the three-dimensional teeth model is displayed by loading.

The numerical measurer 120 measures the inclination angle and the length between any two reference points with respect to the two-dimensional tooth image or the three-dimensional tooth model loaded by the data loading unit 110. That is, when two reference points are designated by the user in the 2D dental image or the 3D dental model, the numerical measurement unit 120 measures the inclination angle between the two reference points and the line segment length connecting the two reference points. . Here, the reference point is preferably selected for each of teeth 1 and 7 of the occlusal surface of the patient, but any two points may be selected when the angle of inclination of the patient's teeth can be reflected. However, for convenience of description, the present invention will be described for selecting a reference point for the occlusal surface (see FIGS. 11A and 11B). FIG. 11A illustrates a case in which the user selects the first reference point 211 and the second reference point 212 as two reference points in the two-dimensional tooth image. In FIG. 11B, the third reference point refers to two reference points in the three-dimensional tooth model. The case where the user selects the point 311 and the fourth reference point 312 is shown.

The virtual overlapping unit 130 overlaps the two-dimensional tooth image and the three-dimensional tooth model with respect to each axis constituting the three-dimensional space. Preferably, the virtual overlap unit 130 overlaps with each other based on the occlusal surface of the patient in the two-dimensional teeth image and the three-dimensional teeth model.

First, the virtual superimposition unit 130 overlays the XY plane 300a (sagittal plane) of the three-dimensional teeth model on the side image 200a of the two-dimensional teeth image by using the measurement result by the numerical measuring unit 120. To overlap. That is, the virtual superimposition unit 130 first adjusts the occlusal inclination angle in the three-dimensional teeth model based on the two-dimensional teeth image, and then adjusts the size and position of the occlusal surface in the two-dimensional teeth image based on the three-dimensional teeth model. Overlap.

Specifically, the virtual overlapping unit 130 overlaps the side image 200a of the 2D dental image and the X-Y plane 300a of the 3D dental model through a series of processes as follows.

The virtual superimposition unit 130 sets the occlusal inclination angle with respect to the XY plane 300a of the three-dimensional teeth model according to the occlusal inclination angle with respect to the side image 200a of the two-dimensional teeth image, thereby realizing the occlusal surface of the patient. The angle of inclination is reflected in the three-dimensional tooth model (see FIG. 12A). This is to match the occlusal inclination angle with respect to the X-Y plane 300a of the three-dimensional teeth model to the occlusal inclination angle with respect to the side image 200a of the two-dimensional teeth image. Here, the occlusal inclination angle represents the degree of inclination with respect to the X axis.

To this end, the numerical measurement unit 120 measures the occlusal inclination angle using a line segment connecting two reference points specified by the user in the side image 200a of the two-dimensional tooth image. In addition, the numerical measurement unit 120 measures the occlusal inclination angle using a line segment connecting two reference points specified by the user in the X-Y plane 300a of the three-dimensional teeth model. In this case, the user designates the corresponding reference points at the same positions on the occlusal surface of the lateral plane 200a of the two-dimensional dental image and the XY plane 300a of the three-dimensional dental model. Select tooth 7 to determine the segment. The virtual superimposition unit 130 changes the occlusal inclination angle with respect to the X-Y plane 300a of the three-dimensional teeth model to the occlusal inclination angle with respect to the side image 200a of the two-dimensional teeth image. That is, the virtual superimposition unit 130 rotates the occlusal inclination angle with respect to the X-Y plane 300a of the three-dimensional teeth model according to the occlusal inclination angle with respect to the side image 200a of the two-dimensional teeth image. In other words, the virtual overlap 130 sets the occlusal inclination angle with respect to the X-Y plane 300a of the three-dimensional teeth model as the occlusal inclination angle of the actual patient.

Next, the virtual overlap unit 130 overlaps the size and position of the side image 200a of the 2D dental image according to the size and position of the XY plane 300a of the 3D tooth model (see FIG. 12B). . This is to match the size and position of the side image 200a of the 2D dental image to the length and position of the X-Y plane 300a of the 3D dental model.

To this end, the numerical measurement unit 120 uses the line segment connecting two reference points specified by the user in the XY plane 300a of the three-dimensional teeth model to form an occlusal surface in the XY plane 300a of the three-dimensional teeth model. Measure the size and position through. In addition, the numerical measurement unit 120 uses a line segment connecting two reference points specified by the user in the side image 200a of the 2D dental image through the occlusal surface in the side image 200a of the 2D dental image. Measure the size and position. At this time, the user assigns the reference points to the same positions on the occlusal surface as described above. The virtual overlapping unit 130 overlaps the size and position of the 3D dental model with respect to the X-Y plane 300a according to the size and position of the side image 200a of the 2D dental image. At this time, the virtual superimposition unit 130 adjusts the length of the line segment in the two-dimensional teeth image according to the length of the line segment in the three-dimensional teeth model, to match the size of the XY plane 300a of the three-dimensional teeth model Adjust the size for the side image 200a. In this case, the occlusal surface of the 2D dental image and the occlusal surface of the 3D dental model do not coincide with each other but have the same inclination angle and size. Thereafter, the virtual superimposition unit 130 checks each center point of the line segment in the 2D tooth image and the line segment in the 3D tooth model, and the center of the line segment in the 2D tooth image as the line center of the 3D tooth model. Adjust the position. Thus, the occlusal surface of the two-dimensional dental image is located at the same point coinciding with the occlusal surface of the three-dimensional dental model.

Meanwhile, the virtual overlap unit 130 performs the same series of overlapping operations on the YZ plane 300c (the coronal plane) of the three-dimensional tooth model with respect to the front image 200b of the two-dimensional tooth image as described above. (See FIGS. 13A and 13B). At this time, the occlusal surface inclination angle represents the degree of inclination of the Z axis. A detailed description thereof will be omitted since it can be easily understood through the overlapping operation on the X-Y plane 300a (sagittal plane) of the 3D tooth model with respect to the side image 200a of the 2D tooth image.

However, the virtual overlapping unit 130 does not perform a series of overlapping operations as described above when the XZ plane 300b (Frankport surface) of the 3D dental model is overlapped with the top image of the 2D dental image. Instead, the Y-axis is rotated by the rotation axis with respect to the YZ plane 300c of the three-dimensional teeth model to adjust.

To this end, the virtual overlapping unit 130 sets the Y axis as the rotation axis in the Y-Z plane 300c of the 3D tooth model by the user. At this time, the user selects the center of the two foremost teeth 321 in the YZ plane 300c of the three-dimensional tooth model as the Y axis (see FIG. 14A), and the Y axis is approximately the median palatal suture 301 and PMRJ ( Perpendicular to the intersection of 302). Subsequently, when the position 323 where the outermost point 322 is to be moved by the user is selected by the user in the YZ plane 300c of the three-dimensional teeth model, the virtual overlap 130 may include the YZ plane ( 300c) rotates the Y axis to the position selected by the user with the rotation axis (see FIG. 14B).

Meanwhile, the virtual superimposition unit 130 performs virtual superimposition on the two-dimensional tooth image and the three-dimensional tooth model, and then, as a part of the virtual treatment diagnosis, paper surgery, wafer fabrication, and orthodontics as a subsequent process. Provide the necessary user interface.

In addition, the virtual overlapping unit 130 may correct the error of the size of the 2D dental image after completing the overlapping operation (see FIGS. 15A and 15B). Here, as described above, the size of the 2D tooth image is adjusted to the size of the 3D tooth model, which may cause an error because it uses a reference point designated by the user. To this end, the virtual superimposition unit 130 readjusts the spacing of the conventional reference scale 221 which informs the size of the two-dimensional teeth image to the preset distance value 222. In this case, the virtual superimposition unit 130 resets the size of the two-dimensional teeth image when the distance of the reference scale is measured by the user's manipulation through the numerical measurement unit 120 and a known distance value is input by the user. 15A and 15B, when the known distance value of the reference scale is '4', the result of measuring the reference scale 221 of the 2D dental image is '3.99', and thus the size of the 2D dental image is '4'. Reset to.

In addition, the virtual overlap unit 130 implements a state in which the virtual articulator 331 is coupled after the two-dimensional tooth image and the three-dimensional tooth model are superimposed (FIGS. 16A and 16B). In this case, the virtual overlapping unit 130 overlaps the hinge axis 332 of the tracing and the rotation axis 333 of the virtual articulator 331 in the side image 200a of the two-dimensional tooth image. The user selects the rotation axis 333 of the virtual articulator 331 and then selects the hinge axis 332 of the tracing.

The user interface unit 140 provides a user with access to the virtual overlapping apparatus 100 for performing a series of virtual overlapping tasks. That is, the user interface unit 140 connects with various input devices (for example, a keyboard, a mouse, a touch pad, a pen mouse, etc.) to provide an input function for manipulating the virtual overlapping device 100, and the virtual overlapping device. It is connected to various output devices (e.g., monitor, printer, etc.) to provide an output function for displaying the processing result of the 100. For example, when a user inputs a predetermined task for virtual superposition using a keyboard or a mouse, the user may confirm that the result is output through the monitor.

The storage unit 150 stores patient personal information for each patient, a two-dimensional tooth image of the patient, and a three-dimensional tooth model. Here, the patient personal information includes a patient name, social security number, medical history, medical treatment schedule information, and the like. In this case, the 2D dental image and the 3D dental model may be directly obtained from a corresponding external device (ie, an X-ray device, a 3D scanner, etc.) directly connected to the virtual superimposition device 100, or may be obtained externally and then through wired or wireless communication. May be provided.

17 is a flowchart illustrating a virtual superimposition method for dental treatment according to an embodiment of the present invention.

First, the virtual superposition apparatus 100 performs virtual superimposition on the side and front of the two-dimensional tooth image and the three-dimensional tooth model. In this case, the virtual overlapping apparatus 100 may first perform a virtual overlapping operation on any one of the side or the front surface, but preferably, the side is first performed on the side. That is, the virtual superposition apparatus 100 performs a virtual overlap operation on the side image 200a of the two-dimensional teeth image and the XY plane 300a of the three-dimensional teeth image, and then the front image 200b of the two-dimensional teeth image. And it is preferable to perform a virtual overlap operation on the YZ plane 300c of the three-dimensional teeth model. Here, since the virtual overlapping work on the side and the front are performed through the same process, they will be collectively described without specific description.

In detail, the data loading unit 110 overlays the 2D dental image and the 3D dental model and loads the data onto the user interface unit 140 (S401).

Thereafter, the virtual superimposition unit 130 adjusts the inclination angle of the three-dimensional teeth model according to the two-dimensional teeth image using the reference point selected by the user (S402). That is, the virtual superimposition unit 130 rotates the inclination angle of the three-dimensional teeth model according to the inclination angle of the two-dimensional teeth image, thereby matching the inclination angle of the three-dimensional teeth model to the inclination angle of the two-dimensional teeth image. This is because the inclination angle of the three-dimensional teeth model is not applied to adjust the inclination angle of the three-dimensional teeth model using the inclination angle of the two-dimensional teeth image. Here, when the first reference point 211 and the second reference point 212 are selected by the user on the occlusal surface of the 2D dental image, the numerical measuring unit 120 refers to the first reference point 211 and the second reference point. The angle of inclination of the line segment between the points 212 is measured. In addition, when the third reference point 311 and the fourth reference point 312 are selected by the user on the occlusal surface of the 3D dental model, the numerical measurement unit 120 refers to the third reference point 311 and the fourth reference point. The angle of inclination of the line segment between the points 312 is measured.

Then, the virtual superimposition unit 130 adjusts the size and position of the two-dimensional teeth image according to the three-dimensional teeth model using the reference point reselected by the user (S403). That is, the virtual superimposition unit 130 matches the size and position of the two-dimensional tooth image according to the size and position of the three-dimensional tooth model, thereby matching the size and position of the two-dimensional tooth image to the size and position of the three-dimensional tooth model. . At this time, the virtual overlap unit 130 matches the length of the line segment measured from the three-dimensional teeth model and the line length measured from the two-dimensional teeth image to match the size, and adjust the position by matching the midpoint of the line segment. This is because the three-dimensional tooth model corresponds to the patient's actual teeth in one-to-one correspondence and adjust the size and position of the two-dimensional teeth image based on the three-dimensional teeth model. Here, when the third reference point 311 and the fourth reference point 312 are reselected to the occlusal surface of the 3D dental model by the user, the numerical measurement unit 120 may include the third reference point 311 and the fourth reference point. The length of the line segment between the reference points 312 is measured. In addition, when the first reference point 211 and the second reference point 212 are reselected to the occlusal surface of the 2D dental image by the user, the numerical measurement unit 120 may include the first reference point 211 and the second reference point. The length of the line segment between the reference points 212 is measured.

On the other hand, the virtual superposition apparatus 100 performs a virtual superposition work on the upper surface of the two-dimensional teeth image and the three-dimensional teeth model. In this case, as described above, the virtual superposition apparatus 100 performs a virtual superposition operation on the sides and the front of the two-dimensional teeth image and the three-dimensional teeth model (S405), and then YZ plane 300c of the three-dimensional teeth model. It is adjusted by rotating the Y axis to the rotation axis with respect to (S406).

As described above, the virtual superposition apparatus 100 may perform a virtual superposition diagnosis on the two-dimensional tooth image and the three-dimensional tooth model as described above (S401 to S406), and may perform a virtual treatment diagnosis process as a subsequent process. The user interface environment is provided to the user (S407).

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

110: data loading unit
120: numerical measurement unit
130: virtual overlap
140: user interface unit
150: storage unit

Claims (17)

A data loading unit for overlaying and loading the 3D tooth model according to the photographing direction of the 2D tooth image;
A numerical measuring unit for measuring an inclination angle and a length by using reference points respectively selected by the user on the two-dimensional tooth image and the three-dimensional tooth model; And
A virtual superimposition unit for adjusting the inclination angle of the three-dimensional teeth model according to the inclination angle of the two-dimensional teeth image and adjusting and overlapping the size and position of the two-dimensional teeth image according to the length of the three-dimensional radiographic image;
Dental superimposition device comprising a. The virtual superimposition device of claim 1, further comprising a user interface configured to identify the 2D dental image and the 3D dental model and provide an interface for selecting the reference point. The virtual superimposition device of claim 1, further comprising a storage unit configured to store the two-dimensional dental image and the three-dimensional dental model acquired from the outside for each patient. The XY of claim 1, wherein the two-dimensional tooth image includes a side image and a front image, and the three-dimensional tooth model is an anatomically sagittal plane by setting a coordinate system in a three-dimensional space. And a YZ plane that is a coronal plane and a plane. The method of claim 4, wherein the data loading unit loads the XY plane corresponding to the side image when the side image and loads the YZ plane corresponding to the front image when the front image. Virtual nesting device for dental treatment. The method of claim 4, wherein the numerical measurer measures an inclination angle and a length of a line segment between at least two reference points selected at the same point by the user in the occlusal surface of the 2D dental image and the 3D dental model. Dental superimposition device, characterized in that. The virtual overlapping apparatus according to claim 4, wherein the virtual overlapping part virtually overlaps the front image and the YZ plane, and then rotates a Y axis with a rotation axis with respect to the YZ plane to adjust a position. . The virtual superimposition of claim 4, wherein the virtual superimposition unit corrects an error of the size of the two-dimensional dental image by using a reference scale on the two-dimensional dental image after the virtual superimposition is completed. Device. The virtual overlapping apparatus of claim 4, wherein the virtual overlapping unit overlaps the hinge axis of the tracing and the rotation axis of the virtual articulator in the side image to implement a combined state of the virtual articulator. The virtual overlapping apparatus of claim 4, wherein the user interface unit provides an input function and an output function to a user to perform a virtual overlapping operation. A loading step of loading the three-dimensional tooth model according to the photographing direction of the two-dimensional tooth image; And
Virtual overlapping by adjusting the tilt angle, size and position of the two-dimensional dental image and the three-dimensional dental model by using reference points selected by the user on the two-dimensional dental image and the three-dimensional dental model, respectively. step;
Virtual nesting method for dental treatment comprising a. 12. The method of claim 11, wherein the two-dimensional teeth image includes a side image and a front image, the three-dimensional teeth model is set to the coordinate system of the three-dimensional space anatomically sagittal plane XY plane and coronal plane YZ plane A virtual superposition method for dental treatment comprising a. The method of claim 12, wherein the loading step comprises loading the XY plane corresponding to the side image when the side image and loading the YZ plane corresponding to the front image when the front image. Virtual nesting method for dental treatment. The method of claim 12, wherein the virtual overlapping step,
Measuring an inclination angle with respect to a line segment between at least two reference points selected at the same point in sequence by a user in the occlusal surface of the two-dimensional dental image and the three-dimensional dental model;
Adjusting the inclination angle of the three-dimensional tooth model according to the inclination angle of the line segment of the two-dimensional tooth image;
Measuring a length of a line segment between at least two reference points sequentially reselected by the user at the same point in the occlusal surface of the three-dimensional tooth model and the two-dimensional tooth image; And
Adjusting the size and position of the 2D dental image according to the length of the line segment of the 3D dental model;
Virtual nesting method for dental treatment comprising a. 15. The method of claim 14, wherein the virtual overlapping step, after the virtual overlap of the front image and the YZ plane to each other, the virtual overlap for dental treatment comprising the step of adjusting the position by rotating the Y axis with respect to the YZ plane in the rotation axis. Way. The method according to any one of claims 11 to 15, further comprising providing a user with a user interface environment for diagnosing a virtual treatment after virtual superposition of the two-dimensional teeth image and the three-dimensional teeth model is completed. Virtual nesting method for dental treatment. A program storage device for tangibly implementing a program of instructions readable by a computer and executable by a computer to execute a virtual superimposition method for dental treatment, the method comprising:
Loading a three-dimensional tooth model according to the photographing direction of the two-dimensional tooth image; And
Adjusting and superposing an inclination angle, a size, and a position of the two-dimensional dental image and the three-dimensional dental model by using reference points selected by the user on the two-dimensional dental image and the three-dimensional dental model, respectively; Program storage device comprising a.

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