KR20090105130A - Occlusion status determination method through digital data and digital articulator - Google Patents

Abstract

The present invention relates to a method for determining occlusal state through digital data and a digital articulator, and more particularly, to determine the shape of the tooth model and the occlusal state of the tooth model through the digitalized data of the patient's teeth. Through this, the method of determining the occlusal state through digital data and the digital articulator can easily and accurately determine the occlusal state by correcting the shape of the tooth model.

Occlusal state determination method through the digital data of the present invention is to enter the mandibular motion determinants and the data of the patient's maxillary and mandibular teeth to form a tooth model for the teeth needing repair treatment based on the After calculating the occlusal state of the tooth model by simulation, the shape of the tooth model is corrected.

According to the method for determining occlusal state through digital data of the present invention, the occlusal state can be accurately determined, and the occlusal state of the dental model can be easily and inexpensively determined without using a complicated and expensive preregulatory articulator.

Description

Occlusal state determination method and digital articulator using digital data

The present invention relates to a method for determining occlusal state through digital data and a digital articulator, and more particularly, to an articulator and an occlusal state determining method for determining an occlusal state between a tooth to be restored and an existing tooth during a restoration treatment.

The most important function of the teeth is to chew food, and when the teeth are damaged, the restoration treatment is performed to restore the damaged teeth. At this time, the occlusal state between the restored teeth and the existing teeth is judged and the shape of the teeth to be restored It is essential to go through the process of correction.

In this case, it is necessary to reproduce the maxillary and mandibular jaw movements of the oral cavity outside the oral cavity in order to determine the occlusal state between the tooth to be repaired and the existing teeth. The device for reproducing the jaw movement outside the oral cavity is called an articulator.

It is important to accurately reproduce the jaw movement by accurately reflecting the state of the maxilla and the mandible. In order to reproduce the jaw movement outside the mouth, it is important to accurately reflect the anatomical positional relationship between the maxilla and the mandible in the articulator.

However, the anatomical positional relationship of the human body varies greatly from person to person, and research on the jaw movement itself is currently in progress. Therefore, it is very difficult to accurately reproduce the jaw movement of the human body outside the mouth.

In addition, the jaw movement is a very complex movement, which is not only progressed in one direction, but also the up and down movement between the maxilla and the mandible, and the forward and backward movement and the lateral movement occur simultaneously. These jaw movements are due to the anatomical characteristics of the joints connecting the maxilla and the mandible. The reproducibility of the jaw movements varies according to the degree of reflecting the anatomical characteristics of the maxilla and mandible. It can be divided into sex articulator and preregulatory articulator.

The unregulated articulator is still used, but it can only open and close, and is divided into a flat articulator or an average articulator. The non-regulatory articulator does not accurately reflect the anatomical characteristics of the human body, and can only cause up-and-down movement of the articulator, which can cause premature occlusion or disability in the oral cavity.

On the other hand, the semi-regulatory articulator is also called a two-dimensional articulator and can control over-inclination and control the induction angle with the incisor, so it has better reproducibility than the non-regulatory articulator. Such semi-regulatory articulators have been widely used in clinical practice because of their excellent reproducibility and simpler usage than the pre-regulatory articulators.

The preadjustable articulator is designed to reproduce the characteristics of all marginal movements, including the curvature and direction of the condylar ramp, and accurately reproduces the central axis of the mandibular movement, so that the jaw movement can be reproduced very accurately, but it is very expensive and very easy to use. There is a complicated problem.

As described above, the conventional mechanical articulator does not accurately reproduce the jaw movement or the usage is very complicated, so that the general use is difficult and the pre-regulatory articulator that accurately reproduces the jaw movement has a problem of being very expensive and free to use.

The present invention is to determine the shape of the tooth model and the occlusal state of the tooth model that needs to be repaired through the digitized data of the patient's teeth, etc. in order to solve the above problems and correct the shape of the tooth model through Disclosed is a method for determining occlusal state through digital data and a digital articulator capable of easily and accurately determining occlusal state.

Occlusal state determination method through the digital data of the present invention to achieve the above object in the method for determining the occlusal state of the teeth for the restoration of the teeth, including the position of the lower hinge axis (mha) Inputting data on an exercise determinant; Inputting data about the maxillary and mandibular teeth of the patient; Forming a tooth model of a tooth in need of a restoration treatment based on data of the upper and lower teeth of the patient; Simulating the mandibular movement of the patient based on the mandibular motion determinant and data on the tooth; Calculating an occlusal state of the tooth model during the simulation step; Correcting the shape of the tooth model based on the calculated occlusal state.

In addition, the data on the mandibular motion determinant is characterized in that back trace through the mechanical configuration including a facebow.

In addition, the data on the mandibular movement determinant is characterized in that extracted through the motion capture for the mandibular movement of the patient and input.

In addition, the data on the mandibular motion determinant is characterized in that the mandible movement state of the patient 3D scan at regular intervals, and extracts and inputs the mandatory motion determinant through the scanned data.

In addition, the data on the mandibular motion determinant is characterized in that extracted through the image obtained through the image diagnostic device including a CT for the patient is input.

In addition, the data on the upper and lower teeth of the patient is characterized in that input through the 3D scan.

In addition, the tooth model that needs to be repaired in the tooth model forming step is to determine the shape of the teeth using the data of the upper and lower teeth and to select from the database stored anatomical data about the teeth based on the shape It features.

In addition, the tooth model that needs to be repaired in the tooth model forming step may determine the shape of the tooth using data of the upper and lower teeth and form the tooth model based on the shape of the tooth adjacent to the repaired tooth. Characterized in that.

In addition, in the tooth model forming step, the shape of the tooth is determined using data of the maxillary and mandibular teeth, and the step of simulating the mandibular movement of the patient includes a horizontal axis, a vertical axis, and a thalamus for the hinge axis (mha). It includes a motion to rotate within a certain range along the axis, the rotational movement is characterized in that the simulation in consideration of the shape of the tooth.

In addition, the occlusal state of the tooth model coordinates the shape of the tooth and the surface of the tooth model in need of repair, and compares and determines the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model. do.

In addition, the step of correcting the shape of the tooth model is characterized in that made by modifying the data for the portion where the reverse occurs as a result of the contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model.

In addition, the contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model is characterized in that made by the coordinate group grouping a range of coordinates.

In addition, the determination of the portion where the reversal occurs is characterized in that the determination of the magnitude of the coordinates with respect to the vertical axis of the coordinate group.

Digital articulator of the present invention for achieving the above object in the articulator for determining the occlusal state of the tooth for the restoration treatment of the teeth, including the position of the hinge axis (mha) of the lower jaw anatomical data And an input module for inputting data on the upper and lower teeth of the patient. A mandibular movement element determination module for determining the determination element of the mandibular movement by tracing back the input anatomical data; A tooth model forming module for determining a shape of a tooth model for a tooth in need of a restoration treatment based on the input data of the upper and lower teeth; Occlusal state determination module for reproducing the mandible movement based on the determined factor of the mandibular movement and determines the occlusal state of the tooth model formed from the tooth model forming module and the existing tooth; It includes a tooth model correction module for correcting the shape of the formed tooth model based on the determined occlusal state.

As described above, the present invention has an effect that can accurately reproduce the complex jaw movement.

In addition, even without the use of expensive pre-regulatory articulators, the jaw movement can be reformed more accurately to increase the accuracy of the restoration treatment.

In addition, by treating the occlusal process with digital data, there is an effect that can be easily and efficiently produced in connection with the numerical analysis device.

In addition, there is an effect that can dynamically determine the occlusal state between the tooth to be repaired and the existing tooth.

Hereinafter, a method for determining occlusion state and digital articulator through digital data according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating an embodiment of a method for determining occlusal state through digital data according to the present invention.

According to the present invention to determine the occlusal state between the tooth to be repaired and the existing tooth for the repair treatment of the damaged tooth and determine the shape of the tooth to achieve a natural occlusion state.

First, the method of determining the occlusal state of the present invention traces back the mandibular motion determinant through data on the mandibular motion determinant for reproducing the jaw movement, that is, the mandibular motion, in order to determine the occlusal state between teeth.

The actual mandibular movements are anatomically complex interactions involving the condyle located at the tip of the mandible and the joint ridges and discs located at the maxillary part. Therefore, the mandible movement does not occur in any one movement alone, but various movements occur in combination. For this reason, as mentioned above, it is very difficult to reproduce the mandibular movement outside the oral cavity, and the mechanical configuration for reproducing similarly is complicated, difficult to use, and expensive.

Occlusal state determination method according to the present invention has the advantage that can not only reproduce the mandibular movement of the patient as it is using digital data as it can freely adjust the state of the mandibular movement to determine the occlusal state dynamically.

The occlusal state determination method of the present invention determines the mandibular motion determinant for reproducing the mandible motion by backtracking anatomical data. Such backtracking may be automatically determined according to the input form of the anatomical data.

Mandibular movement is a complex movement caused by a combination of several factors. The determinants of mandibular movement consist of anatomical data of jawbone, including anterior overtilt, lateral overtilt, Bennett angle, incisal inclination, and distance between the head.

As shown in FIG. 2, the anterior overwork slope (A) represents the inclination of the bone in the upper part of the condyle and determines the trajectory of the forward or backward movement of the mandible. By adjusting the front and rear gradients, it is determined whether the teeth to be repaired are considered in consideration of the state of the surface of the teeth during the forward movement.

As shown in FIG. 3, the lateral overwork slope (B) and the Bennett angle represent the inclination of the bone surrounding the condyle, and determine the trajectory of the mandibular rotation (lateral) movement. According to the side sloping degree, the element that accurately reproduces the trajectory of the mandibular rotation (lateral) movement or the conventional mechanical articulator considers the forward and sloping angles and the lateral overslope inclination. It has already been mentioned that it is difficult to reproduce a motion in which rotational motion occurs simultaneously.

The inclination inclination (C) represents the inclination of the incisors as shown in Figure 4 to determine the trajectory during the forward and vertical movement.

Also, as shown in FIG. 5, the distance between the heads ℓ is a factor that determines the radius of rotation during the lateral movement, and determines the trajectory of the lower jaw during the lateral movement.

Mandibular movement is a movement caused by the combined action of the above determinants. There is a natural problem that conventional mechanical articulators cannot accurately reproduce the movement of complex linear and rotary movements. There is a problem that is very difficult, expensive and can not prevent the occurrence of errors.

The mandibular motion determinant is determined by backtracking in various ways. The data input for backtracking the mandibular motion determinant may be input through motion capture. Motion capture is to fix the reference point protruding from the tooth in front of the face to the mandible to reproduce the mandibular movement, and then capture the movement of the reference point by a certain time unit to trace back the determinants of the mandibular movement. For this backtracking, conventional anatomical statistics may be used. For example, the position of the central axis of the mandibular movement extracts the relative position from the mandible teeth by extracting the center of the reference point formed in a fan shape in the reproduced mandibular movement. In addition, the epididymal inclination is determined by reproducing the mandibular movement forward or rearward and analyzing the movement of the reference point by backtracking using an existing anatomical analysis method.

Mandibular motion determinants can also be traced back through mechanical configuration. For example, a facebow is mounted on the patient's maxilla and mandible and the mandibular motion is recorded to determine the determinants of mandible motion. It is divided into arbitrary facebows, but any facebow can be used. However, since kinematic can trace back the mandibular determinants more precisely, there is an advantage of accurately reproducing the mandibular movement.

The determinant of mandibular motion may be backtracking of mandibular motion determinant by 3D scanning the mandible motion that is reproduced at regular intervals and processing the scanned data appropriately. The path of mandibular movement can be extracted from successive scan data, and the extracted path can be analyzed to trace back the determinants of mandibular movement.

In addition, the determinant of the mandibular movement can also be traced back through the image obtained through the image diagnosis apparatus including the CT for the patient. This can be traced back to the determinants of the mandibular movement through the image obtained at the boundary of the continuous or limited range of the mandibular movement that is reproduced through the image diagnostic equipment such as CT. In this case, since the determinant of mandibular movement is mainly extracted through structural data of the human body, the CT image has an advantageous side in extracting the determinant of mandibular movement.

In order to extract the determinants of the mandibular movement in various ways and determine the occlusal state of the teeth, the occlusal state determination method according to the present invention inputs data on the maxillary and mandibular teeth of the patient. Data about the teeth of the maxilla and the mandible is input through a 3D scan, for example, and the data about the surface of the tooth is extracted by processing the data input through the scan. The shape of the tooth is determined by using the data of the extracted tooth surface, and the shape of the tooth model to be repaired is determined using the tooth model. For example, the anatomical data of various teeth is stored in the determination of the shape of the tooth model. You can also use a database.

When using an anatomical database of teeth, the data of the patient's existing tooth shape is compared with the tooth data stored in the anatomical database to search for the same or similar tooth data and to determine the restoration of the tooth model based on the retrieved tooth data. The shape will be determined.

Even without using an anatomical database, the shape of the tooth model that needs to be repaired can be determined based on the shape of the adjacent tooth, which roughly determines the shape of the general tooth model according to the position of the tooth and the adjacent teeth, ie both sides and top or bottom. The shape of the tooth model may be determined by considering the surface of the tooth.

As described above, after the determinants of the mandibular movement and the data of the maxillary and mandibular teeth are input and the shape of the tooth model to be repaired is determined, the mandibular movement is reproduced according to the mandibular movement determinant. And linear motion is made complex. The mandibular movement is not only reproduced by the mandibular determinants but is also affected by the shape of the tooth previously determined. In other words, the mandibular movement is rotated about the central axis or the like, or linear movement along the condylar inclination surface is slightly deformed along the surface of the tooth determined before. That is, even if the axis is rotated or linearly moved around the axis of the teeth in the maxillary and mandible, or the surface of the teeth in the maxillary to reproduce the mandibular movement so that it is not located below the surface of the teeth in the mandible.

In this macro aspect, the mandibular movement determinants are reproduced, and in the microscopic aspect, the mandibular movement is modified in consideration of the surfaces of the maxilla and the mandibular teeth to accurately and precisely reproduce the mandibular movement.

By reproducing the mandibular movement as above, the shape of the tooth model to be repaired and the occlusal state of the existing tooth are judged. As an example of the method of determining the occlusal state, the occlusal state may be determined by coordinate data on the surface of the tooth and compare the coordinates of the tooth model to be repaired with the coordinates of the existing tooth. That is, the coordinates of the tooth model and the existing tooth are classified by coordinate groups grouped by a certain range of coordinates, and it is determined whether the inversion of the coordinate value occurs in contrast to the coordinates of the z axis for each coordinate group perpendicular to the z axis. If the result of the reversal indicates that there is interference between the tooth to be repaired and the existing tooth, the coordinate group on the surface of the interfered tooth is compared to the z-axis coordinate value of the coordinate group on the surface of the tooth model to be repaired. Replace with the z-axis coordinate of.

According to the reconstructed maxillary motion after this replacement, the z-axis coordinates are contrasted with the z-axis adjacent to the z-axis adjacent to determine whether the reverse. The dental model is determined by determining the occlusal state between the existing tooth and the tooth model to be repaired through the mandibular movement reproduced in consideration of the determinants of the mandibular movement and the shape of the existing tooth and correcting the shape of the tooth model to remove the interference. The shape of is to be corrected to fit well with existing teeth and joints. By simply replacing the z-axis coordinates, the shape of the tooth model can be angled. In this case, the curved surface can have a natural surface.

6 is a block diagram of an embodiment of a digital articulator according to the present invention. As shown, the digital articulator according to the present invention includes an input module 100, a mandibular motion element determining module 200, and a tooth model. It comprises a module 300, the occlusal state determination module 400, the tooth model correction module 500.

The input module 100 is a module for inputting data for backtracking the mandibular motion determinant and the maxillary and mandibular tooth data. The input module 100 may include an input device of a general computer or may include a specific GUI for more convenient input.

The lower jaw motion determination module 200 is a module that traces back the determinants of the lower maneuver using the data input through the input module 100, and includes a motion capture device and a mechanical device when the back motion is traced through the motion capture. If used, include facebow.

The tooth model forming module 300 forms a tooth model to be repaired using the teeth data of the maxilla and the mandible input through the input module 100. The tooth model to be repaired may be formed using surface data of adjacent teeth, but may also be formed using a database 600 for existing teeth.

Occlusal state determination module 400 is to determine the occlusal state of the tooth model and the existing teeth while reproducing the mandibular movement using the mandibular movement determining factors and the maxillary and mandibular tooth surface data. Unlike the conventional mechanical articulator, the digital articulator of the present invention can completely reproduce the mandibular movement by applying the elements related to the mandibular movement in real time to reproduce the mandibular movement in real time. Therefore, there is an effect that can accurately and effectively determine the occlusal state of the tooth model.

The tooth model correction module 500 corrects the shape of the tooth model to be repaired by reflecting the result of the occlusal state determined by the occlusal state determination module 400.

The corrected tooth model may be shown to the user through the display device and may be appropriately modified again.

In addition, the digital articulator of the present invention can be produced directly through the CAD, CAM by outputting the shape of the finally corrected tooth model as CAD, CAM data. In this case, the prosthesis and restoration treatment, which currently takes several days or weeks, may become the same day and cost can be reduced.

1 is a flowchart illustrating a digital occlusal method according to an embodiment of the present invention.

2 is a schematic anatomical diagram showing an anterior oblique oblique view.

Figure 3 is a schematic anatomical diagram showing the lateral oblique oblique view.

4 is a schematic view showing the inclination inclination.

5 is a schematic anatomical diagram illustrating the distance between the condyles.

6 is a schematic block diagram illustrating a digital articulator according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

Input module: 100 Mandibular motion determination module: 200

Tooth model formation module: 300 Occlusal state determination module: 400

Tooth model correction module: 500

Claims (24)

In the method of determining the occlusal state of the teeth for the restoration of the teeth, Determining back mandibular motion determinants through the anatomical data of the maxilla and mandible, including the location of the hinge axis of the mandible (mha); Inputting data about the maxillary and mandibular teeth of the patient; Forming a tooth model of a tooth in need of a restoration treatment based on data of the upper and lower teeth of the patient; Simulating the mandibular movement of the patient based on the mandibular motion determinant and data on the tooth; Calculating an occlusal state of the tooth model during the simulation step; And a method of determining an occlusal state through digital data, the method including correcting a shape of a tooth model based on the calculated occlusal state. The method according to claim 1, And the data about the mandibular motion determinant is traced back through a mechanical configuration including a facebow. The method according to claim 1, And the data on the mandibular motion determinant is traced back through motion capture of the mandibular motion of the patient. The method according to claim 1, The data on the mandibular motion determinant is a 3D scan of the state of the mandibular motion of the patient at regular intervals and digitized occlusal state determination method characterized in that the trace back the mandibular motion determinant through the scanned data. The method according to claim 1, And the data of the mandibular motion determinant is traced back through an image acquired by an image diagnosis apparatus including a CT of a patient. The method according to claim 1, Digital occlusal state determination method characterized in that the input of the patient's upper and lower teeth teeth through a 3D scan. The method according to claim 1, The tooth model that needs to be repaired in the tooth model forming step is characterized by determining the shape of the tooth using data of the upper and lower teeth and selecting from a database storing anatomical data about the tooth based on the shape. Digitalized occlusion state determination method. The method according to claim 1, In the tooth model forming step, the tooth model that needs to be repaired may be configured to determine the shape of the tooth using data of the upper and lower teeth and to form the tooth model based on the shape of the tooth adjacent to the repaired tooth. A method for determining a digitized occlusion state, characterized in that. The method according to claim 1, In the tooth model forming step to determine the shape of the teeth using the data on the upper and lower teeth, Simulating the mandibular movement of the patient includes a linear or rotational movement within a predetermined range along the horizontal axis, vertical axis, sagittal axis with respect to the hinge axis (mha), The linear or rotational motion is digitized occlusal state determination method, characterized in that the simulation in consideration of the shape of the tooth. The method of claim 9, The occlusal state of the tooth model is coordinated with the shape of the tooth and the surface of the tooth model that needs to be repaired, and digitization characterized by comparing the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model Method for determining occlusion status. The method of claim 10, The step of correcting the shape of the tooth model is a digitalized occlusal state determination method, characterized in that by modifying the data on the inversion occurs as a result of the contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model . The method according to claim 11, The contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model is a digitized occlusal state determination method, characterized in that made for each coordinate group grouped coordinates of a certain range. The method according to claim 12, And determining the portion where the reversal occurs by determining the magnitude of the coordinates with respect to the vertical axis of the coordinate group. In the articulator for determining the occlusal state of the teeth for the restoration of the teeth, An input module to input anatomical data of the maxillary and mandibular and data about the maxillary and mandibular teeth of the patient, including the position of the hinge axis of the mandible; A mandibular movement element determination module for determining the determination element of the mandibular movement by tracing back the input anatomical data; A tooth model forming module for determining a shape of a tooth model for a tooth in need of a restoration treatment based on the input data of the upper and lower teeth; Occlusal state determination module for reproducing the mandible movement based on the determined factor of the mandibular movement and determines the occlusal state of the tooth model formed from the tooth model forming module and the existing tooth; And a dental model correcting module for correcting a shape of the formed dental model based on the determined occlusal state. The method according to claim 14, The decisive factor of the mandibular motion is a digital articulator, characterized in that the back trace through a mechanical configuration including a facebow. The method according to claim 14, The decisive factor of the mandibular motion is a digital articulator, characterized in that by determining the trace back data extracted through the motion capture of the mandibular motion of the patient. The method according to claim 14, The decisive factor of the mandibular motion is a digital articulator, characterized in that the mandatory movement state of the patient 3D scan at a predetermined time interval and determine through the back trace using the scanned data. The method according to claim 14, The decisive factor of the mandibular movement is a digital articulator, which is determined by back tracking using an image obtained through an image diagnosis apparatus including a CT of a maxillary and a mandible of a patient. The method according to claim 14, Data about the maxillary and mandibular teeth of the patient is extracted through a 3D scan, The shape of the tooth model to be repaired is selected based on the data on the teeth of the upper and lower jaw extracted through the 3D scan, characterized in that for determining the selection in the database stored anatomical data for the teeth. The method of claim 19, The tooth model to be repaired determines the shape of the tooth model using data about the teeth extracted through the 3D scan, And determine the shape of the tooth model based on the shape of the tooth adjacent to the repaired tooth. The method according to claim 14, Reproduction of the mandibular movement of the patient includes a linear or rotational movement within a predetermined range along the horizontal axis, vertical axis, sagittal axis with respect to the hinge axis (mha), The linear or rotary motion is a digital articulator, characterized in that to reproduce the mandibular movement in consideration of the shape of the tooth. The method of claim 19, The occlusal state of the tooth model coordinates the shape of the tooth and the surface of the tooth model in need of repair, and compares the tooth model and the coordinates of the surface of the tooth adjacent to the tooth model to determine the digital. Articulator. The method of claim 20, Correction of the shape of the tooth model is made by modifying the data for the portion where the inversion occurs as a result of the contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model, The contrast of the coordinates of the tooth model and the surface of the teeth adjacent to the tooth model is a digital articulator, characterized in that made for each coordinate group grouping a range of coordinates. The method of claim 23, wherein And determining the portion where the reversal occurs by determining the magnitude of the coordinates with respect to the vertical axis of the coordinate group.

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