KR20170125263A - Method for correcting teeth in tooth correcton simulation device - Google Patents

Abstract

The present invention relates to a method for correcting teeth in a tooth correction simulation device. The method comprises the following steps: obtaining upper jaw/lower jaw images of an examinee; obtaining tooth objects from the upper jaw/lower jaw images; obtaining arch information from the upper jaw/lower jaw images; implementing an impact program with respect to the tooth objects and locating the tooth objects to be close to each other above the arch according to the arch information; and comparing arch length information included in the arch information and length sum information of the tooth objects and obtaining tooth extraction information.

Description

METHOD FOR CORRECTING TEETH IN TOOTH CORRECTON SIMULATION DEVICE FIELD OF THE INVENTION [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of orthodontic treatment in a dental orthodontic simulation apparatus.

In general, malocclusion refers to malocclusion in which the upper and lower teeth are abnormal in dentition. Such malocclusion not only causes functional problems such as writing and pronunciation problems and aesthetic problems on the face, but also causes tooth decay and gum disease And may cause the same health problems.

Therefore, tooth orthodontic treatment should be performed in order to make such malocclusion into normal occlusion.

Prior to such orthodontic treatment, in order to determine the appropriate treatment modality, it is desirable that a simulation of the expected tooth shape at the time of orthodontic treatment be preceded, in addition to the current tooth status of the examinee.

However, in correcting the teeth in such a tooth simulation apparatus, various methods are available. For example, you can determine how to make an appropriate tooth, or how to make a small portion of the tooth small.

The most important aspect of this procedure is that the tooth must be positioned evenly, the tooth movement distance is the smallest, and the smaller the rotational angle of rotation, the shorter the treatment period and the better the prognosis.

The present invention relates to a tooth simulation apparatus that allows selection of a best method when a tooth candidate and a practitioner perform a desired type of tooth correction in establishing a diagnosis and treatment plan preceding tooth correction, The present invention is intended to provide a method of correcting a tooth in a dental-orthodontic simulation apparatus, which simulates a tooth position thereafter and enables a movement distance of each tooth to be confirmed during a dental-orthodontic procedure so as to anticipate the result of the dental correction.

In order to solve the above-described problems, a method of simulation of teeth correction in a dental-orthodontic simulation apparatus, which is one embodiment of the present invention, includes acquiring an image of a maxillary / mandibular image of a subject; Obtaining a tooth object from the maxilla / mandible image; Acquiring dental archery information from the maxillary / mandibular image; Setting a tooth movement mode; And executing a collision program on the tooth object so that the tooth object is positioned closely to each other on the arch based on the arch information based on the tooth movement mode.

Here, the method of simulating teeth correction may include: obtaining a movement distance of the tooth object; And displaying the moving distance information on the maxillary / mandibular image.

Here, the tooth movement mode may include one of a non-movement mode, a 4/4 extraction mode, a 5/5 extraction mode, and a user setting mode.

The step of executing a collision program for the tooth object to cause the tooth object to be positioned closely to each other on the arch based on the arch movement information based on the tooth movement mode includes: setting a fixed line; Moving a first tooth object to a fixed line and then setting it as a fixed object; Measuring a vector distance between the first tooth object and a second tooth object that is an adjacent object of the first tooth object; And automatically vectorizing the second tooth object by a predetermined distance in the first direction according to the dental arch information so that the vector distance is within the predetermined vector distance range.

The step of automatically vector-moving the second tooth object by a predetermined distance in the first direction according to the dental arch information so that the vector distance is within the predetermined vector distance range may include: if the vector moving distance is a negative value, It is determined that the object and the second tooth object overlap each other and the second tooth object is separated and separated in accordance with the moving direction of the first tooth object so that the first tooth object and the second tooth object are in the preset range And determines that the first tooth object and the second tooth object are spaced apart from each other so that the first tooth object and the second tooth object are within a predetermined vector distance range if the vector movement distance is a positive value, The second tooth object is moved to move the first tooth object It may comprise the step of the adjacent vector moving along a direction.

The step of automatically vectoring the second tooth object by a predetermined distance in a first direction according to the archery information so that the vector distance is within a predetermined vector distance range may include: Determining a control point; And moving the first control point and the second control point vector along the predetermined path.

The method further includes storing the tooth standard data, and executing a collision program with respect to the tooth object so that the tooth object can be closely contacted with the dental arch based on the dental movement information based on the tooth movement mode The method comprising: setting a setting surface; Performing a first movement on the tooth object data such that an end of the tooth object is in contact with the setting surface; And performing a second movement, which is a rotation axis movement with respect to the tooth object, using the tooth standard data after the first movement.

Here, the first tooth object may be transposed.

Here, the user setting mode may be a mode in which one of the tooth objects is selected by extraction, interdental deletion, or tooth fixing by a signal input through a user input unit.

According to an embodiment of the present invention having the above-described configuration, when a practitioner performs simulation of teeth correction for tooth correction of a recipient, when the expected tooth correction method is performed, movement distance and movement direction of each tooth, The angle of movement and the like can be known to the practitioner. Thus, it is possible to make the orthodontic work more easily by guiding the doctor who is not experienced in the orthodontic treatment accurately.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart for explaining a method of orthodontic treatment in a denture correction simulation apparatus. FIG.
2 is a view showing an example of a tooth not in contact with an occlusal surface in connection with an embodiment of the present invention;
FIG. 3 is an exploded view of an image of a subject in accordance with an embodiment of the present invention to illustrate the maxilla and mandible. FIG.
FIG. 4 is a conceptual diagram for explaining a first embodiment of a method of automatically moving a tooth object according to an embodiment of the present invention; FIG.
FIG. 5 is a conceptual diagram for explaining a second embodiment of a method of automatically moving a tooth object according to an embodiment of the present invention; FIG.
6 is a conceptual diagram illustrating a method of measuring a vector distance between teeth in an automatic method of moving a tooth object according to an embodiment of the present invention.
7 is a view for explaining a tip angle and a torque angle of a tooth according to an embodiment of the present invention;
FIG. 8 is a view for explaining an example of implementing a dental-orthodontic simulation apparatus to which a dental-orthodontic method in a dental-orthodontic simulation apparatus according to an embodiment of the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout.

1 is a flowchart for explaining a method of orthodontic treatment in the orthodontic appliance. As shown in FIG. 1, in the orthodontic simulation apparatus, the maxillary / mandibular image of the examinee is acquired through an image acquisition device such as a scanner included in the apparatus (S1). Then, a tooth object is obtained from the obtained maxillomandial image (S2). That is, each of the teeth included in the maxillary / mandibular image is objectified to acquire a plurality of tooth objects. Then, the dental archery information is obtained from the maxillary / mandibular image. As the shape information of the jawbone where the tooth is located, in the present invention, the dental arch information of the examinee is acquired from the maxillary / mandibular image acquired from the image acquisition information of the scanner or the like, but not limited thereto, To obtain the size of the jawbone of the examinee, and to acquire appropriate standard archery information using the standard archery information.

In this manner, tooth standard data is stored in the memory as well as in the dental archery information (S4). The tooth standard data is information for allowing each tooth to be positioned optimally, and it includes rotation information such as tip angle information as well as position information. An example of this will be described later.

Next, the user selects one of the tooth movement modes displayed in the tooth movement selection block displayed on the display unit (S5). Such a tooth movement mode may include at least one of a non-extraction mode, a 4/4 extraction mode, and a 5/5 extraction mode. The non-extraction mode is a mode for aligning and moving the tooth objects side by side without deleting the tooth objects included in the maxillary / mandibular image. The 4/4 extraction mode defines the transposition as 1 tooth, 3, and 4, it means a mode in which four teeth that are symmetrical on both sides are deleted, and teeth objects are aligned and moved in parallel. In the 5/5 extraction mode, It means a mode in which five teeth that are symmetrical on both sides are deleted and the tooth objects are aligned and moved in parallel.

Also, if a set of tooth objects is set through the user input unit, the setting can be defined as the tooth movement mode. That is, the user can set the teeth of a tooth object by deleting teeth (reducing the size by grinding teeth), extraction, fixed teeth, or the like through a user input unit. For example, when the user makes a decision with the anterior teeth being fixed, the teeth being deleted between the teeth, and the canines being extracted, the tooth movement mode can be determined according to the setting.

As described above, the tooth movement mode is determined by the user's selection, the object, the dental arch information, and the tooth standard data are acquired, and then the collision program stored in the memory is driven (S6). Then, by the collision program, irregularly arranged teeth are appropriately adhered and arranged on the arch information in parallel. The movement distance and rotation information of each tooth object as it is arranged side by side is acquired (S7), and the movement distance and the rotation information are displayed near each tooth object of the aligned maxilla / mandibular image, Information such that a practitioner such as a dentist selects a method of correcting the teeth of the examinee is displayed on the display unit.

Here, the collision program is executed on the tooth object so that the tooth object is positioned closely on the arch of the arch according to the archery information. The displacement (the first tooth object) is fixed to the fixed position and is set as a fixed object And then measures the vector distance between the first tooth object and the second tooth object which is the adjacent object of the first tooth object and then determines the second tooth object so that the vector distance is within the predetermined vector distance range The vector may be automatically moved by a predetermined distance in the first direction according to the archery information. At this time, in the case of transposition, it may be set as a fixed object after moving to the center line of the arch.

Hereinafter, the case where the transposition is fixed means that the transposition is first shifted to the center line, and then the shift is not performed from the center line.

More specifically, if the vector moving distance is a negative value, it is determined that the first tooth object and the second tooth object overlap each other, and the first tooth object and the second tooth object are set to be within the preset range And if the vector movement distance is a positive value, it is determined that the first tooth object and the second tooth object are spaced apart from each other, if the vector movement distance is a positive value, The first tooth object and the second tooth object are moved in the adjacent vector along the moving direction of the first tooth object so that the first tooth object and the second tooth object are within the predetermined vector distance range, The objects can be moved so as to be adjacent to each other.

In addition, in order to vertically align tooth objects, after a setting surface is set, a first movement with respect to the tooth object data is made so that an end of the tooth object is in contact with the setting surface, and after the first movement, The second movement, which is the rotation axis movement with respect to the tooth object, is performed using the tooth standard data, so that all the teeth can be positioned horizontally on the setting surface.

The setting surface may be included in the tooth standard data or may be obtained from the tooth object. In other words, after acquiring the lower end point information from at least three teeth objects of the maxillary teeth, the upper end point information of at least three teeth of the mandibular teeth is obtained using the obtained lower end point information, You can also set the mandibular setting plane through the top point information.

In more detail, the third movement, the second movement, and the first movement can be performed for each tooth reference. Here, the third movement is horizontal movement such that the center point of the tooth object, or the control point, is located above the set path included in the tooth standard data. That is, it may be a path set by a tooth object or a movement along an arc line which is a set path included in the tooth standard data. Particularly, when performing the third movement, it is possible to control so that the transposition of the tooth objects is located at the correct position. That is, the interface between the transposition and the prepositions may be moved so as to coincide with the midline (center line) of the tooth standard data, so that each tooth object is placed in the correct position. After the third movement, the second movement is released, and the second movement includes the torque angular movement and tip angular movement for each tooth object. Then, after the second movement, the first movement, which is the vertical movement to make contact with the setting surface, is performed. The first movement is a movement to acquire the central axis of the tooth and then make a vertical movement along the tooth center axis so that the tip of the tooth object comes into contact with the setting surface.

After the third movement and the first movement are set to predetermined values, it is determined whether each tooth object is in contact with the setting surface. If the tooth object is spaced apart from the setting surface by a predetermined distance or longer than a predetermined distance, that is, if the tooth object does not contact the setting surface, the tip of the plurality of tooth objects is brought into contact with the setting surface, The first movement to the data is performed. That is, when the tooth object is spaced by a predetermined distance or more, the center axis of the tooth is acquired, and then the tooth is vertically moved along the tooth center axis so that the tip of the tooth object is in contact with the setting surface. If the tooth object is spaced apart from the setting surface by a predetermined distance or more, adjacent movement is performed along the central axis. When the tooth object is transmitted from the setting surface by a predetermined distance or more, the tooth object is moved along the central axis. Alternatively, the tooth object may be vertically moved up and down along the manipulation direction of the setting surface (occlusal surface) so that the tip of the tooth object is brought into contact with the setting surface. In carrying out the first movement, a method of contacting the setting surface as described above, or a method of moving the upper and lower teeth until the upper and lower teeth collide with each other can be used.

After completion of the first movement to the third movement, it is confirmed whether the tooth object touches the setting surface again. Check whether the tooth object touches the setting surface, and if not, proceed to the first movement again. If the tooth object is brought into contact with the setting surface, it is checked whether there is a collision between the objects between the teeth. That is, after checking the vector distance between the objects, if the vector distance is a negative value, it can be determined that collision has occurred between the objects. When a collision occurs between the objects, the separated vector movement is performed so that the objects are separated from each other. More specifically, a collision program is driven for a plurality of tooth objects to readjust the tooth objects so that they do not collide with each other. This sets a setting path connecting the center points of the tooth objects, After the collision of the tooth objects is confirmed, the collision of the tooth objects causes one of the tooth objects to be automatically spaced a predetermined distance along the set path. Here, the set path may be path information included in the tooth standard data, or may be an arch path extracted from the maxillary / mandibular object of the examinee. Or path information based on the setting of the practitioner. In addition, the center point of the tooth may be moved as a control point along the tooth setting path at the time of movement, and the control point may be set for each tooth according to the setting of the practitioner.

If the vector movement distance, which is the distance between the tooth object and the adjacent tooth object, is a positive value, it is determined that the first tooth object and the second tooth object are spaced apart from each other, . The second tooth object is moved to the adjacent vector according to the moving direction of the first tooth object so that the first tooth object and the second tooth object are within the predetermined vector distance range. When the adjacent vector movement is performed in this manner, the tooth object may be twisted again, and the procedure is then re-executed again.

After such automatic alignment is completed, one of the teeth can be changed to a value different from the tooth standard data according to the request of the examinee or the operator. That is, you may want to put the teeth in more, or even more, to protrude out. In this case, the rotation axis angle of the first tooth object, which is the tooth to be corrected, is manually changed through the user input unit of the simulation apparatus. Then, the rotation axis angle of the other tooth objects is automatically aligned using the changed rotation axis angle and the tooth standard data.

When the first tooth object is inverted, the rotation axis angle of the second tooth object is automatically aligned according to the following [Equation 1].

[Formula 1]

X = B / A * C

X: rotation axis angle of the second object that is automatically aligned

A: rotation axis angle of the first object set

B: rotation axis angle of the changed first object

C: rotation axis angle of the set second object

Table 1 shows the rotation axis angle of the primary aligned teeth (tooth object).

Here, when the angle of the first tooth, which is the transposition of the maxilla, is changed to 8 degrees, the rotation axis of the remaining teeth of the maxilla is changed according to the above-mentioned expression (1). The angles of rotation of the changed teeth are changed to the following [Table 2].

Angle of rotation axis changed according to Equation 1 according to change of frontal angle 7 6 5 4 3 2 One One 2 3 4 5 6 7 Maxilla 0 0 2.4 2.4 4 5.6 8 8 5.6 4.0 2.4 2.4 0 0 Mandatory 0 One 2 3 4 5 6 6 5 4 3 2 One 0

If there is a change in the angle of the rotation axis with respect to teeth other than transposition, there are two methods. In the first case, transposition is the case of moving, and the second case is the case of fixing the transposition.

In the first case, for example, when the upper 5th tooth is changed from 3 degrees to 4 degrees in [Table 1], the following table is changed. In this case, it is changed according to [Equation 1].

Angle of rotation axis changed according to equation 1 according to 5th tooth angle change 7 6 5 4 3 2 One One 2 3 4 5 6 7 Maxilla 0 0 4 4 6.5 9.3 13.3 13.3 9.3 6.5 4 4 0 0 Mandatory 0 One 2 3 4 5 6 6 5 4 3 2 One 0

In the second case, when the second object tooth is located between the transpose and the first object tooth, the rotational axis is changed according to the following expression (2).

[Formula 2]

X = D- (D-C) * (D-B) / (D-A)

X: rotational axis angle of the automatically aligned second tooth object

A: rotation axis angle of the first object set

B: rotation axis angle of the changed first object

C: rotation axis angle of the set second object

D: Angle of rotation axis of the preset

If the second tooth object to be automatically aligned is located between the first tooth object and the molar (including molar teeth), it is automatically aligned according to the following expression (3).

[Formula 3]

X = B / A * C

X: rotation axis angle of the second object that is automatically aligned

A: rotation axis angle of the first object set

B: rotation axis angle of the changed first object

C: rotation axis angle of the set second object

[When the second object is located between the first object and the molar (including the molar)]

In this case, when the teeth of the maxillary third tooth are changed from 5 degrees to 4 degrees and the rotation axis angle of the anterior teeth is fixed, the rotation axis is changed as shown in Table 4 below.

Changed angle of rotation axis when prefixed 7 6 5 4 3 2 One One 2 3 4 5 6 7 Maxilla 0 0 2.4 2.4 4 6.4 10 10 6.4 4. 2.4 2.4 0 0 Mandatory 0 One 2 3 4 5 6 6 5 4 3 2 One 0

Thus, when the angle of the rotation axis of one of the tooth objects is changed, the tooth angle object is automatically aligned with the axis of the tooth, so that the operator does not need to change the axis angle one by one.

After completion of the automatic alignment, one of the teeth can be changed to the X, Y, and Z axes according to the requirements of the examinee or the operator. After that, the teeth are automatically aligned according to the operation after S15.

 Hereinafter, the actual operation in the orthodontic appliance for performing the above-described operation will be described in more detail with reference to FIG.

On the other hand, the control unit obtains the tooth movement distance of each tooth object according to the driving result of the collision program, and displays the movement distance together with the tooth object on the display unit.

Hereinafter, automatic movement alignment of a tooth object according to the present invention will be described in detail.

2 is a view showing an example of a tooth not in contact with an occlusal surface in connection with an embodiment of the present invention. In other words, if a normal subject is scanned by a three-dimensional scanner and imaged, it can be confirmed that various types of teeth exist. As shown in Fig. 1, the T1 tooth is located downward with respect to the occlusal surface, that is, the surface where the maxillary and mandibular teeth meet, and the T2 tooth is located upward with respect to the occlusal surface.

In orthodontics, it is very important that the teeth move axially (or vertically in the occlusal plane) about the central axis of the tooth as well as to the left and right and the rotational movement, so that the teeth coincide with the occlusal plane Do. That is, it is necessary to move the T1 tooth in the upward direction D1 and the T2 tooth in the D2 direction.

On the other hand, when the tooth protrudes like T3, it is necessary to reduce the protruding angle so as to restrict the duck mouth. When the angle of protrusion of the T3 tooth is reduced, the total size of the arch of the examinee is reduced. As a result, the teeth that did not collide with each other may collide with each other.

Further, even in the case of the T1 and T2 teeth, a collision or widening between the teeth may occur in accordance with the axial movement of the teeth.

In order to determine whether a tooth will collide and how much spacing will be required in the tooth calibration and how to use it (extraction method, tooth movement method, etc.) in this case, It is necessary to move the tooth up and down by adjusting the projecting angle of the teeth.

FIG. 3 is a developed image diagram for showing the maxilla and mandible of the examinee associated with an embodiment of the present invention. FIG. As shown, the general adult has seven teeth (1-7) on both sides of the anterior teeth (1: front teeth). These teeth are each slightly protruding, and the following table shows an example of tooth standard data.

Rotation axis angle of tooth standard data 7 6 5 4 3 2 One One 2 3 4 5 6 7 Maxilla 0 0 3 3 5 7 10 10 7 5 3 3 0 0 Mandatory 0 One 2 3 4 5 6 6 5 4 3 2 One 0

Here, the numbers represent respective teeth, 1 represents transposition, and 7 represents molar teeth. As illustrated in Table 1, the angles of the mandible and the mandibular teeth are stored in the memory of the orthodontic simulation apparatus according to the present invention as tooth standard data.

On the other hand, the occlusal surface can be determined as follows, that is, in the case of the maxilla, after confirming three set points, that is, one of the anterior teeth and the two molar end points (R1 to R3) S1). Also, in the case of the mandible, the three sets of points O1 to O3 may be similarly identified, and then the plane formed by the set points O1 to O3 may be set to the mandibular occlusal plane S2.

2, when teeth that are not in contact with the occlusal surface are moved up and down along the central axis of each tooth, the teeth are overlapped with each other like the first tooth and the second tooth, or the fifth tooth and the sixth tooth , The separation distance becomes large. Further, along with the vertical movement of the tooth, the center point (control point) of the tooth can be spaced from the set path.

In such a case, these teeth should be located within a set distance of a short distance, and should be separated or moved adjacent to the set path. This will be described in more detail with reference to FIG. 4 and FIG.

FIG. 4 is a conceptual diagram for explaining a first embodiment of a method of automatically moving a tooth object according to an embodiment of the present invention, FIG. 5 is a flowchart illustrating a method of automatically moving a tooth object according to a second embodiment of the present invention. FIG.

4 is a view for explaining the movement of the second tooth object when the first tooth object and the second tooth object are overlapped with each other as the first tooth object is moved.

After acquiring the maxillary / mandibular object from the tooth image of the examinee obtained through an oral scanner, CT photographing, and so on, each of the teeth is objectified, and an image as shown in FIG. 3 (a) is displayed. Here, when the first tooth object A, which is the transposed position, is moved along the preset path P (moves to A '), the first tooth object A' and the first tooth object A ' The second tooth object B is collided (overlapped). Since such a thing can not actually happen, the tooth corresponding to the second tooth object (B) must be moved to the substance at the time of orthodontic treatment. At this time, as shown in FIG. 3 (b), the second tooth object B moves a predetermined distance along the preset path P (moves to B ') to avoid the collision.

Here, the preset path P may be generated on the basis of tooth standard data previously stored in the memory, or may be generated through the maxillary / mandibular object in the tooth image of the examinee. At this time, (Control points) of the control point.

When the teeth are spaced apart from each other, they are treated as shown in FIG. 5A, the first tooth object A is moved in a direction away from the second tooth object B (moves to A '), or the first tooth object A is moved in the direction away from the second tooth object B When the object A and the second tooth object are spaced apart from each other, the first tooth object A and the second tooth object B adjacent to the first tooth object A are separated from the first tooth object A ' (Within the vector distance) (movement to B '). Accordingly, the respective objects are aligned in parallel with a predetermined interval. At this time, the control points of the respective objects are moved along the preset path P.

Hereinafter, a method of measuring the vector distance in the automatic movement in Figs. 4 and 5 will be described in more detail with reference to Fig.

5 is a conceptual diagram illustrating a method of measuring a vector distance between teeth in an automatic method of moving a tooth object according to an embodiment of the present invention.

In FIGS. 5A and 5B, A denotes a first tooth object and B denotes a second tooth object. The first tooth object and the second tooth object are two-dimensional or three-dimensional objects made up of a plurality of points. A method of measuring the distance between them is a method of measuring the distance between points A and B, with the direction from A to B being the positive direction. According to this method, the distances between all the points (P1 to P7) of A and all the points (p1 to p7) of B are measured, and the shortest distance (d) among these distances is defined as the vector distance. In Fig. 4 (b), the distance between the point and the surface is measured. The distances between all the points P1 to P7 of the first tooth object A and the plurality of surfaces S1 and S2 of three points of the second tooth object B are measured, Distance.

Although not shown, the distance between the plane at A which is the first tooth object and the point at B which is the second tooth object can be measured, and the shortest distance among them can be defined as the vector distance. This will be the case opposite to that of FIG. 4 (b).

In the present invention, the collision between objects is checked using a vector distance. However, the present invention is not limited to this, and it is possible to check whether there is a collision between objects according to various methods.

In Fig. 6, the vector distance has a positive value when the first tooth object and the second tooth object are spaced apart from each other. If the first tooth object and the second tooth object are overlapped, it is to be understood that the vector distance has a negative value.

Meanwhile, the number of points of the first tooth object and the second tooth object may be leveled to increase the operation speed. For example, it is possible to set the number of points of the first tooth object to be 100 at level 1, 1000 at level 2, 10,000 at level 3, and 100000 at level 4.

If the user performs automatic movement of the second tooth object after selecting level 1, the calculation speed is very high, but the accuracy is low.

On the other hand, when the user selects the level 4 and performs automatic movement of the second tooth object, the calculation speed is very slow, but the accuracy is the most excellent.

7 is a view for explaining a tip angle and a torque angle of a tooth according to an embodiment of the present invention.

The angle of the rotation axis indicates how much the teeth are inclined with respect to the arch. The angle of the rotation axis can be distinguished by a torque angle indicating whether the tooth T is rotated to the left or to the right when viewed from the front and a tip angle indicating whether the tooth T is rotated to the left or to the left when viewed from the side.

Figure 7 (a) shows the torque angle. The teeth consist largely of root (b) and crown (c). Here, the torque angle? Means the angle between the tangent line L1 at one point K of the crown b and the normal line M1 of the setting surface V.

Figure 7 (b) shows the tip angle. The tip angle beta may refer to an angle between the side rotation axis M2 and the vertical plane L2 in the arch.

Hereinafter, an example in which the orthodontic method for performing the above-described operation is actually applied will be described with reference to FIG.

FIG. 8 is a view for explaining an example of implementing a dental-orthodontic simulation apparatus to which a dental-orthodontic method in a dental-orthodontic simulation apparatus according to an embodiment of the present invention is applied. 8, an upper / lower image block 10 of a subject is acquired through a scanner, and the upper right image block 20 and the lower right image block 30 are displayed on the right side and the lower right side, respectively , The tooth movement selection block 40 (maxilla), 40 '(mandible), and 40' (maxilla / mandible common) are displayed on each of the development image blocks 20 and 30 and the maxilla /

In the maxillary / mandibular image block 10, the teeth image of the examinee is shown in a perspective view. Here, each of the teeth A and B is individually objectized. In the idealized state, the image of the developed plane of the tooth may be displayed on the upper and lower developed image block 20 and the lower developed image block 30, respectively.

In this state, the tooth movement selecting blocks 40 and 40 'for selecting the tooth movement mode are displayed on the upper and lower developing image blocks 20 and 30, respectively. The upper tooth movement selecting block 40 may include a non-discrimination icon 41, a 4/4 icon 42, a 5/5 icon 43, and a prefixing icon 44. The mandibular tooth movement selection block 40 'may include a non-discrimination icon 41', a 4/4 icon 42 ', a 5/5 icon 43' and a prefixing icon 44 '

When the 4/4 icon 42 of the upper tooth movement block 40 is selected, the fourth tooth of the maxillary tooth among the tooth objects of the examinee is extracted (erased) do. Accordingly, the teeth-aligned image in which the teeth are deleted four times are displayed on the upper developed image block 20, and the movement distance of the tooth is displayed. That is, values (21, 22) indicating how far both lateral teeth are moved are displayed near each tooth, and a value (23) indicating whether or not the transposition has moved is also displayed near the transposition. Herein, the minus value indicates the distance that each tooth object has moved backward, and the positive value indicates the distance that each tooth object has moved forward. Here, P, M, and D in the drawing indicate plus, minus, and distance, respectively, and they will be actually displayed in numerical values. In addition, the movement rotational angle and the vertical movement distance of each tooth object can also be displayed together.

On the other hand, if the user selects the 5/5 icon 43, the fifth tooth is extracted to both sides, and then the collision program is executed again, and the image of the tooth shape after the correction is displayed on the upper- It becomes possible to display it.

Similarly, when the non-extraction icon 41 is selected, the collision program is executed without deleting the tooth object, and the image of the tooth shape after correction is displayed on the maxilla expansion image block 20 and the movement distance of the tooth object is displayed together .

 In addition, when the fourth / fourth icon 42 'of the mandibular tooth movement block 40' is selected, the fourth tooth of the lower teeth of the examinee's tooth is extracted (erased) Alignment is initiated. Accordingly, in the mandibular development image block 30, a tooth alignment image in which four teeth are deleted is displayed, and the movement distance of the tooth is displayed. That is, values (31, 32) indicating how far both side teeth are moved and a value (33) indicating whether the tooth has moved are displayed. Herein, the minus value indicates the distance that each tooth object has moved backward, and the positive value indicates the distance that each tooth object has moved forward.

Next, in the mandibular expansion image block 30, an image of the tooth alignment state when the fourth tooth is extracted is displayed.

When the user selects the 5/5 icon 43 ', the fifth tooth is extracted to both sides, and then the collision program is executed again to rearrange the image of the tooth shape after the correction to the lower developing image block 30, As shown in FIG.

When the icon in the common tooth movement selection block 40 "displayed on the upper / lower image block 10 is selected, the tooth objects corresponding to the icons simultaneously selected in the maxilla / mandible are deleted The conflict program can be executed.

According to an embodiment of the present invention having the above-described configuration, when a practitioner performs simulation of teeth correction for tooth correction of a recipient, when the expected tooth correction method is performed, movement distance and movement direction of each tooth, The angle of movement and the like can be known to the practitioner. Thus, it is possible to make the orthodontic work more easily by guiding the doctor who is not experienced in the orthodontic treatment accurately.

The method of teeth correction in the orthodontic appliance described above is not limited to the configuration and the method of the embodiments described above but can be applied to all or some of the embodiments so that various modifications of the embodiments can be made. May be selectively combined.

Claims (9)

Acquiring the maxillary / mandibular image of the examinee;
Obtaining a tooth object from the maxilla / mandible image;
Acquiring dental archery information from the maxillary / mandibular image;
Setting a tooth movement mode; And
And executing a collision program for the tooth object so that the tooth object is positioned closely to each other on the arch based on the arch information based on the tooth movement mode.
The method according to claim 1,
Obtaining a movement distance of the tooth object; And
And displaying the moving distance information and the tooth rotation information on the tooth object side displayed in the maxillary / mandibular image.
The method according to claim 1,
The tooth movement mode includes:
A quasi-moving mode, a 4/4 extraction mode, a 5/5 extraction mode, and a user setting mode.
The method according to claim 1,
Executing a collision program on the tooth object so that the tooth object is positioned closely to each other on the arch based on the arch movement information based on the tooth movement mode,
Setting a fixed line;
Moving a first tooth object to a fixed line and then setting it as a fixed object;
Measuring a vector distance between the first tooth object and a second tooth object that is an adjacent object of the first tooth object; And
And automatically vectoring the second tooth object by a predetermined distance in a first direction in accordance with the dental arch information so that the vector distance is within a predetermined vector distance range.
5. The method of claim 4,
The step of automatically vector-aligning the second tooth object by a predetermined distance in the first direction according to the dental arch information so that the vector distance is within the predetermined vector distance range,
If the vector movement distance is a negative value, it is determined that the first tooth object and the second tooth object overlap each other, and in order to make the first tooth object and the second tooth object fall within a preset range, The first tooth object and the second tooth object are spaced apart from each other in accordance with the movement direction of the first tooth object and the vector movement distance is a positive value, And moving the second tooth object in a contiguous vector according to a moving direction of the first tooth object so that the second tooth object is within a predetermined vector distance range. Way.
5. The method of claim 4,
The step of automatically vector-aligning the second tooth object by a predetermined distance in the first direction according to the dental arch information so that the vector distance is within the predetermined vector distance range,
Determining a first control point and a second control point in the second tooth object; And
And moving the first control point and the second control point vector along the predetermined path.
5. The method of claim 4,
Further comprising the step of storing tooth standard data,
Executing a collision program on the tooth object so that the tooth object is positioned closely to each other on the arch based on the arch movement information based on the tooth movement mode,
Setting a setting plane;
Performing a first movement on the tooth object data such that an end of the tooth object is in contact with the setting surface; And
Performing a second movement, which is a rotation axis movement with respect to the tooth object, using the tooth standard data after the first movement; Wherein the method comprises the steps of:
5. The method of claim 4,
Wherein the first tooth object is anterior tooth.
The method of claim 3,
Wherein the user setting mode is a mode that is generated by setting one of tooth extraction, tooth deletion, and tooth fixation by a signal input through a user input unit of the tooth objects.

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