KR20190142080A - Dental implant planning method, apparatus, and recording medium thereof - Google Patents

Abstract

The present invention relates to a dental implant planning method, a device for the same, and a recording medium recording the same. According to a dental implant planning method of the present invention, based on distance-based information with respect to an experimentally and clinically verified implant object, a position of the object is determined. Accordingly, compared to an existing program which mainly depends on experiences and knowledges of a user, accuracy and reliability of planning can be improved and implant crack or damage risks after procedure can be highly reduced.

Description

Dental implant planning method, apparatus therefor, and recording medium recording the same {DENTAL IMPLANT PLANNING METHOD, APPARATUS, AND RECORDING MEDIUM THEREOF}

The present invention relates to a dental implant planning method, apparatus for the same, and a recording medium recording the same, and more particularly, a dental implant planning method for simulating the implantation position and orientation of the implant object through a software program, apparatus for the same And a recording medium recording the same.

Dental implant treatment involves an implant planning process that determines the dimensions, types, locations, and orientations of the implants suitable for the patient's condition prior to the procedure.

Implant planning can first identify the anatomical structure of the patient and the condition of the dental bone such as X-ray image, computed tomography (CT) image, magnetic resonance imaging (MRI), and panoramic image through imaging equipment. This is done by acquiring an image of the patient, selecting the type of implant, the size of the implant, and the like to simulate the position or orientation through a software program.

According to the conventional program, a user views an image of a patient's teeth and places each implant object constituting an implant, such as a crown, abutment, or fixture, at an appropriate position, and the position and implantation angle Also, implant planning is being done in a fist-to-face manner as a method of making decisions depending on experience or intuition. Although there is an aspect that user convenience is improved when adjusting the object by providing a UI (User Interface) that allows the user to adjust the position or implant angle of the implant object, this also means that the user manually determines the position or implant angle of the implant object. There is still a limit in this respect.

The implant plays a role as a tooth and must be strong enough to withstand the strong bite force during mastication exercise. The implant durability is influenced not only by the position or orientation of each implant object but also by the bonding relationship of each object. For example, if the fixture is connected far away from the center of gravity of the crown, there is a risk of the fracture of the crown during chewing movement, and if the distance between the crown and the fixture is too close or too far away, the fixture or abutment may be removed from the placement position. There is a possibility of fracture.

As described above, although the position and distance relation of each implant object are very important in implant planning, a conventional program that performs implant planning based only on the user's experience and knowledge shows large deviations between users in the planning accuracy. According to the present invention, there is a problem that may be exposed to the risk of implant fracture or damage even after the procedure is in need of improvement.

Japanese Laid-Open Patent No. 2011-217947 (2011.11.04)

The present invention has been proposed to solve the problems of the prior art, which performs the implant planning mainly depending on the user experience and knowledge, which degrades the accuracy and reliability of the planning results and may cause various implant fracture or damage even after the procedure. It is an object of the present invention to provide a dental implant planning method, a device therefor, and a recording medium recording the same, which can guide the position of each implant object and the coupling relationship between the objects.

The above object is a dental implant planning method in which each step according to an aspect of the present invention is performed through a dental implant planning apparatus, the method comprising: detecting a tooth loss region where a tooth is lost based on an oral image of a patient; Creating a crown in the tooth loss region so as to meet a predetermined crown height criterion with respect to the height of the crown exposed upwardly over the gingival boundary within the tooth loss region; And generating a fixture at the bottom of the crown to satisfy a predetermined fixture placement height criterion for the distance from the gingival boundary to the top of the fixture.

In this case, the method may further include generating the abutment coupled to the crown so as to satisfy a predetermined crown thickness criterion with respect to the distance from the center of the top surface of the crown to the top of the abutment.

The numerical value according to the crown height reference, the fixture placement height reference, and the crown thickness reference may be defined for each implant type including at least one of cement type and screw type.

In addition, the numerical value according to the crown height criterion, the fixture placement height criterion, and the crown thickness criterion may be defined by dividing according to the anterior group and the posterior group.

In the generating of the fixture, the distance between the alveolar bone boundary and the upper end of the fixture may be varied according to the distance between the gingival boundary and the alveolar bone boundary in the tooth loss area of the patient. Can be.

The method may further include determining a crown size of a tooth number corresponding to the tooth loss area, and generating the crown may generate the crown having the determined size.

The determining of the crown size of the tooth number corresponding to the tooth loss region may include: generating an arch line on the oral cavity image; Receiving a centrifugal boundary of each of the left and right second molars through a user interface unit; Calculating the length of the arch form line to the centrifugal plane boundary of the left and right second molar; And the crown number of the tooth number corresponding to the tooth loss region by applying the length of the arch line to the centrifugal boundary of the left and right second molar to the crown library in which the size of the crown according to the tooth number is defined according to the length of the reference dental arch. Determining the size.

The above object is a loss region detection unit for detecting a tooth loss region in which the tooth is lost based on the oral cavity image of the patient according to another aspect of the present invention; Crown height criterion for the height of the crown exposed upwardly above the gingival boundary within the tooth loss area, fixture placement height criterion for the distance from the gingival boundary to the top of the fixture, and abutment abutment from the top center of the crown A reference information storage unit which stores at least one piece of reference information among crown thickness reference information about an interval to an upper end; And an object generator for generating crowns, fixtures, and abutments in the tooth loss region in response to the stored reference information.

The crown library may further include a crown library in which the size of the crown for each tooth number according to the length of the reference arch form is defined, and the object generation unit may determine the crown size of the tooth number corresponding to the tooth loss region based on the crown library. The crown having the determined size may be generated.

The apparatus may further include an object corrector configured to modify at least one object of the crown, the fixture, and the abutment based on an input through a user interface unit. If the stored reference information does not meet, a notification message may be generated.

Meanwhile, during screw type implant planning, the object generator may generate a screw hole into which a screw for connecting the fixture and the crown is inserted corresponding to the direction of the generated fixture.

In this case, the object generating unit, when the tooth corresponding to the tooth loss area corresponds to the anterior teeth and the screw hole is generated in the forward direction, to propose an angle abutment of the angle that can change the screw hole in the lingual direction By generating and providing a guide message including at least one of a first option and a second option for proposing a cement type implant instead of the screw type, implant planning considering the aesthetics after the procedure may be performed.

As described above, according to the present invention, since implant planning is performed based on the distance reference information between experimental and clinically verified implant objects, accuracy and In addition to improved reliability, the risk of implant fracture or damage can be greatly reduced after the procedure.

1 is a block diagram showing the configuration of a dental implant planning apparatus according to an embodiment of the present invention;
2 is an example in which an arch form is generated in the oral cavity image;
3 is a reference diagram for explaining reference information stored in a reference information storage unit according to an embodiment of the present invention;
4 is a reference diagram for explaining an example in which the reference information storage unit stores reference information for each tooth group according to an embodiment of the present invention;
5A and 5B are reference diagrams for explaining that an object generator generates a screw hole according to an exemplary embodiment of the present invention;
6 is a flow chart showing a dental implant planning method according to an embodiment of the present invention;
7 is a flow chart illustrating a method of determining the size of a crown in accordance with an embodiment of the present invention;
8 illustrates an example of receiving a centrifugal boundary of a left and right second molar; And
9 is a reference diagram for describing an example in which each implant object is generated according to reference information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by the same reference numerals as much as possible throughout the drawings.

The terms or words used in the specification and claims described below should not be construed as being limited to ordinary or dictionary meanings, and the inventors are appropriate as concepts of terms for explaining their own invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.

Dental implant planning apparatus according to the present invention, the implantation position, implantation direction, implantation angle, length, size of the implant object constituting the implant, such as the fixture, the crown, and the abutment which is the connection medium between the crown and the fixture before the implant procedure And the like to provide a simulation of implant placement.

1 is a block diagram showing the configuration of a dental implant planning apparatus according to an embodiment of the present invention. Referring to FIG. 1, the dental implant planning apparatus 100 may include a user interface 10, an arch form generator 20, a loss area detector 30, an object generator 40, a crown library 50, The reference information storage unit 60, and the object correction unit 70.

The user interface unit 10 receives necessary information from the user and displays the information. The user interface unit 10 includes input means for inputting information such as a mouse, a keyboard, a button, a keypad, an input menu and processing results, and various images and information. And a display means for displaying a graphical user interface (GUI), a touch screen for providing input / output through one device, and the like, and various input / output means.

The arch form generating unit 20 generates an arch form line in the oral image. Here, the oral image refers to a multi-dimensional image such as two-dimensional, three-dimensional, etc. in which the tooth arrangement of the patient is displayed on the basis of the image data obtained through the imaging device such as X-ray, CT, MRI, oral scanner, etc. In addition to the images themselves, the images are reconstructed into three-dimensional or cross-sectional images through MPR (Multi-planar Reformation) and CPR (Curved-planar Reformation) techniques, or two images are matched or objects in the oral image are separated. Or an image generated through image processing such as segmentation.

2 shows an example in which an arch form is generated in an oral image.

As shown in FIG. 2, the arch arch line DL is a curve drawn by the dental arch, which is also used when generating a panoramic image. Various algorithms for generating an arch arch line are known. The arch line is an automatic generation method that generates the arch line by recognizing the isolation of the anterior teeth, the peak of the canine, and the peak of the buccal cusp of the molar tooth through an image recognition algorithm based on brightness, color, and shape, or entirely user. The manual method may be generated based on a user input through the interface unit 10, or may be generated in a semi-automatic method of receiving a partial input from a user and generating an entire dental arch line using the same.

The loss region detection unit 30 detects the tooth loss region where the tooth is lost in the oral cavity image.

The loss region detection unit 30 may detect the loss region by using different colors and brightnesses in the region where the tooth is present and the region where the tooth is lost in the oral image. For example, since the densities are different from the areas where the teeth are present, the brightness is different in the CT image according to the attenuation rate of the X-rays. The area where the tooth is missing will appear relatively darker than the area where the tooth is present. Accordingly, the loss area detection unit 30 may include a clustering method, a compression-based method, a histogram-based method, an edge detection method, and a region growth method. The tooth region may be segmented using various known image segmentation techniques such as a growing method, or the tooth region on the dental arch line may be segmented using tooth size statistics, and the pixel values between the tooth regions may be compared with each other, or In comparison, the loss of tooth area can be detected.

The object generator 40 generates implant objects in the detected tooth loss area. Here, the implant object is an object constituting the implant, and includes a fixture, abutment, and crown. Since the position or orientation of each implant object and the coupling relationship between the objects are important for successful implantation, the object generator 40 determines the size and length of the implant object suitable for the detected tooth loss area, and for each object. In order to determine a position or an implantation angle, information stored in the crown library 50 and the reference information storage unit 60 to be described below are used.

The crown library 50 is for determining the size and shape of the crown corresponding to the tooth loss region of the object generator 40, and defines the size of the crown for each tooth number according to the length of the reference dental arch. The crown library 50 stores a three-dimensional or two-dimensional crown shape model having a size defined for each tooth number according to the length of the reference dental arch.

Here, the length of the reference arch form is a standard length of the arch form connecting the centrifugal plane of the second second molar past the entire tooth from the centrifugal surface of one second molar, the statistical length value of a number of ordinary people can be applied.

The crown library 50 is, for example, assuming that the reference dental arch length is 20 cm, the entire tooth from the anterior to the second molar constituting the 20 cm dental arch, that is, from the 11th to 27th in the maxilla according to the tooth number classification In the case of the teeth, the mandible defines the size of the crown by tooth number from 31 to 47, this crown library 50 can be built on the basis of experimental / statistical tooth size value, the tooth shape of many common people have.

In this case, the length of the reference dental arch and the size of the crown for each tooth number may be provided for the maxilla and the lower jaw, respectively, and the length of the reference dental arch may be defined for various reference dental arch length cases such as 20 cm, 22 cm, and 24 cm. In addition, the length of the arch form is different depending on the gender, age, race and the like, the crown library 50 reflects the change in the size of the crown according to the length of the arch, the crown library 50 according to the sex, age, race, etc. of the patient crown The size of each can be stored, and the size of the crown by tooth number can be defined by considering not only the reference length of the arch but also the width of the arch, which is the distance across the arch. For example, a case is classified by considering two items simultaneously, such as a first case having a reference arch length of 20 cm and a dental arch width of 12 cm, a second case having a reference arch length of 21 cm and a width of an arch form of 13 cm. You can define the size of the crown by number.

In addition, the crown library 50 may further include the shape of the arch form to define the size of the crown for each tooth number. For example, according to the shape of the arch form can be divided into a square (Square), tapered (Ope), (Oval), and the like, the crown library 50, even if the reference arch length is the same as the specific arch form You can also define the size of each crown.

The reference information storage unit 60 stores reference information regarding a position where the implant object is to be placed and a distance between the objects in the tooth loss region.

3 is a reference diagram for describing reference information stored in the reference information storage unit 60.

The reference information storage unit 60 stores reference information directly or indirectly related to the positions of the crowns, abutments, and fixtures, and their distances. For the crown C, the reference information storage unit 60 stores the reference information from the gingival boundary B _G in the tooth loss region. Corresponding to the height d1 of the crown C, which is exposed to the top of the gingival boundary B _G by the crown C to the top on the central axis C _{O of the} crown C, ie to the center of the top surface of the crown C. The crown height reference can be stored. In addition, for the abutment AB, the crown thickness reference corresponding to the distance d2 from the center of the upper surface of the crown C to the upper end of the abutment AB may be stored. For the fixture F, the fixture placement height reference corresponding to the distance d3 from the gingival border B _G to the upper end of the fixture F implanted in the alveolar bone may be stored. Numerical values corresponding to each criterion may be determined experimentally in consideration of durability and retention after the procedure.

For reference, if referring to d1, d2, and d3 shown in FIG. 3, each criterion may be named under different names. For example, the crown thickness criterion d2 may also be referred to as the abutment fastening criterion, and the fixture implantation height criterion d3 may also be referred to as the fixture implantation depth criterion.

The reference information storage unit 60 may store specific numerical values of the aforementioned crown height reference d1, crown thickness reference d2, and fixture placement height reference d3 for each implant type. This reflects the specific value that can guarantee a stable treatment result according to the implant type. Here, the implant type may include a cement type, a screw type, etc., but is not necessarily limited to the above type and may store numerical values corresponding to various other types. For reference, cement type is a method of fixing the crown after fixing the crown after connecting the fixture and the abutment, screw type is a method of connecting the fixture and the crown with a screw.

In addition, the reference information storage unit 50 may store the reference information differently for each specific implant object material. For example, in the case of the crown thickness reference d2, the crown thickness standard is determined according to the specific crown material, considering that the minimum thickness that can withstand the occlusion or mastication may be different due to the difference in hardness depending on the crown material such as zirconia, gold, ceramic, etc. d2 values may vary.

Meanwhile, the reference information storage unit 60 may group the teeth according to the tooth number, and store specific numerical values of the crown height reference d1, the crown thickness reference d2, and the fixture insertion height reference d3 for each group.

4 is a reference diagram for explaining an example of storing reference information for each tooth group.

Referring to FIG. 4, the reference information storage unit 60 includes teeth 11 to 13 of the upper jaw, teeth 21 to 23 and teeth 31 to 33 of the mandible, and teeth 41 to 43 of the anterior tooth (G1). And group the teeth 14 to 17 of the maxilla, 24 to 27 teeth of the maxilla, 34 to 37 teeth of the mandible, and 44 to 47 teeth of the mandible into the posterior part (G2), d1, d2 and d3 can be set differently. This reflects the specific values that can guarantee a stable treatment result according to the position of the teeth. For example, the reference information storage unit 60 may store d1 6mm, d2 2mm, and d3 3mm as reference information in the case of the posterior part, and store d1 6mm, d2 2mm, and d3 4mm as reference information in the case of the anterior teeth.

On the other hand, the reference information storage unit 60 may store only one optimal value for maintaining durability after the implant procedure with respect to d1, d2, d3, including the minimum reference value required to maintain durability in addition to the optimal value Two values may be stored for each criterion. For example, as reference values that must be satisfied at least for the posterior part, d1 6mm, d2 2mm. d3 3mm The minimum reference value and the optimal values d1 6.3mm, d2 2.2mm and d3 3.2mm can be stored separately.

In addition, as described above, in addition to the reference values for each of d1, d2, and d3, the reference information storage unit 60 may also store reference values for the sum of the distances. For example, the reference information storage unit 60 may store an optimal and minimum reference value of d1 + d3, which is a distance from the center of the crown upper surface to the top of the fixture. In this case, the values stored for each tooth group and implant type may be set differently. For example, in the case of cement type, the minimum reference value of d1 + d3 may be set to 9 mm for the posterior part and 10 mm for the anterior part.

The object generator 40 determines a crown size corresponding to the tooth loss region based on the crown library 50 described above, and generates a crown in the tooth loss region so as to satisfy the crown minimum height criterion of the reference information storage 60. do. The object generation unit 40 may generate a crown such that the crown is positioned on the arch line line generated through the arch arch generating unit 20. Here, the gingival boundary of the oral cavity image required to satisfy the crown minimum height criterion is based on an algorithm that detects an edge based on pixel values based on an image in which soft tissue is well displayed, such as an oral scan image, or machine learning. It can also be detected through machine learning. For reference, the gingival boundary recognized based on the oral scan image can be identified in the CT image through registration of the oral scan image and the CT image by various well-known matching algorithms based on the feature points. Of course, the crown generation can be made.

The object generation unit 40 receives the centrifugal boundary of the left and right second molar through the user interface unit 10, respectively, measures the length of the arch line to the input left and right boundary, and measures the length in the crown library 50. Can be applied to determine the size of the crown of missing tooth numbers. This reflects the correlation between the length of the arch and the size of each crown placed on the arch. For reference, length measurement of the arch line may be performed based on various known algorithms for calculating the length of a curve, including, for example, a length calculation algorithm based on a static component, and a detailed description thereof will be omitted for simplicity.

The object generation unit 40 may adjust the size of the crown primarily determined through the crown library 50 to reflect the tooth boundary and the gingival boundary adjacent to the tooth loss region. In the vicinity of the adjacent tooth boundary, the color or brightness value of the image changes so that the boundary of the tooth can be automatically detected based on the pixel or voxel value of the image, or the adjacent tooth boundary based on the result of segmenting the tooth area. You can also figure out.

The object generator 40 may fix the fixture and affinity so as to satisfy the reference information about the fixture and abutment stored in the reference information storage 60 based on the preceding crown planning result, that is, the fixture placement height criterion and the crown thickness criterion. Create a butt. The implant object generated through the object generator 40 is provided to be overlaid on the oral cavity image while being inserted into the tooth loss region.

Meanwhile, the object generator 40 may determine that it is impossible to satisfy the reference information when generating the implant object, or generate a guide message recommending or suggesting another implant type in consideration of the aesthetics after the procedure even if the reference information is satisfied. Can be.

In this regard, when it is impossible to satisfy the reference information corresponding to the selected implant type, the object generator 40 generates a message that recommends repair treatment using another implant type, and generates a message through the user interface unit 10. I can display it. For example, assuming that the crown minimum height criterion based on the stored reference information for the cement type is 6 mm, when the height of the crown is difficult to be generated more than 6 mm in consideration of the relationship between the adjacent value and the antagonist value, it is relatively small instead of the cement type. A screw type with a crown minimum height reference may be proposed.

In addition, when performing the implant planning according to the screw type, the object generating unit 40 generates a screw hole into which the screw for connecting the fixture and the crown is inserted, and appropriate abuts according to the direction in which the screw hole is formed. It may generate a guide message suggesting a implant type or suggesting a more suitable implant type.

5A and 5B are reference diagrams for explaining that the object generator 40 generates screw holes.

Referring to FIGS. 5A and 5B, the screw holes h are formed according to the insertion direction of the fixture F, and two straight lines corresponding to both widths of the fixtures F in the insertion direction of the fixture F are extended. The screw hole h is formed in the region where two extended straight lines meet the crown C.

For reference, FIG. 5A illustrates an example in which a screw hole h is generated in a lingual direction in which a tongue is located, and FIG. 5B illustrates an example in which a screw hole h is generated in a labial direction in contact with a lip. Shows.

When the object creation part 40 performs implant planning on the missing tooth as shown in FIG. 5B, when the screw hole is generated in the forward direction, the object generator 40 is inclined at a predetermined angle so that the screw hole may be generated in the lingual direction based on the axis of the fixture. A guide message suggesting an angled abutment can be generated. Alternatively, a guide message may be generated that suggests a cement type that is finished with dental cement such as resin instead of a screw type. In the case of the anterior teeth, when the screw hole is formed on the right side, the finish through the screw is exposed to the outside, so the aesthetics after the procedure are considerably reduced.

In this case, the object generator 40 first generates a guide message recommending a first option for suggesting an angled abutment with a predetermined angle so that the screw hole in the preplanned forward direction can be changed to the lingual direction, and then provides the guide message. If it is not possible to change the screw hole in the forward direction to the lingual direction even with the application of the angle abutment, the next best option may be to provide a guide message recommending the second option suggesting cement type instead of screw type. Alternatively, a guide message including both a first option suggesting an angle abutment and a second option suggesting a cement type may be provided to the user, and the user may be implemented to select one of the two options.

By applying the angle abutment based on the above option, the user can change the screw hole created in the labial direction to the lingual direction, or by changing the screw type to the cement type, the screw is exposed to the labial side and the aesthetics are remarkably increased. The deterioration situation can be prevented.

The object compensator 70 changes the size, position, or implantation angle of the implant object generated by the object generator 40 in response to a user input input through the user interface unit 10.

The object compensator 70 generates an alarm message when the modified content does not meet the reference information stored in the reference information storage unit 60, for example, the minimum standard necessary for maintaining durability, when the modification is made by the user. To make the user aware.

6 is a flowchart illustrating a dental implant planning method according to an embodiment of the present invention. Hereinafter, an organic operation of the dental implant planning apparatus 100 described above will be described with reference to FIG. 6.

First, for implant planning, an image processing process such as acquiring an oral image of a patient and reconstructing an acquired image, image registration, and image segmentation is performed through imaging apparatus such as X-ray, CT, MRI, oral scanner (S10). .

When an oral image for implant planning is provided through the above process, the arch form generating unit 20 generates an arch form line in the oral image (S20). The arch line is a curve that is also used when generating a panoramic image, and various algorithms are known for generating the arch line.

For example, the dental arch line may be automatically generated through a process such as hole filling, connected component analysis, thinning, curve fitting, and the like. For reference, hole peeling is a process for filling an empty area such as a missing tooth or a root canal area, and a connection component analysis is a process for extracting a connection component of an individual tooth, and the thinning operation is a thinning of the connection component. By doing this, an arch form line can be generated based on the centerline of the connecting component. Curve fitting is a process for applying a predetermined function to the arch line produced primarily through thinning to obtain a smooth curved arch line. In addition to such an automatic generation method, the arch form generator 20 may manually generate the arch form line based on a user input through the user interface unit 10.

The dental arch line generated as described above may be utilized in a full-scale implant planning process to determine the size or implantation angle of the implant object described below.

Subsequently, the loss region detection unit 30 detects the tooth loss region where the tooth is lost in the oral image (S30). As described above, the tooth loss region may be detected based on the pixel value or the voxel value of the oral cavity image based on the difference between the portion where the tooth exists and the missing part in the color or brightness expressed in the oral cavity image.

In this case, the loss area detection unit 30 may grasp the tooth number information corresponding to the tooth loss area as well as the location of the tooth loss area. For example, the lost tooth number may be directly input to the user through the user interface unit 10, but the electronic medical record for managing the chart data in which the patient's medical information and the dental condition are recorded according to the patient's visit. EMR) in conjunction with a server (not shown) and the like may also receive information about the missing tooth number. Alternatively, the loss area detection unit 30 divides each tooth area and allocates a tooth number to each divided tooth area according to a preset tooth number assignment criterion, and loses the tooth number through the tooth number assigned to the detected tooth loss area. Can be identified.

The identified missing tooth number may be usefully used when determining the size of the crown corresponding to the missing tooth area, the length, the width of the fixture, and the like.

Subsequently, implant planning for determining the position, size, and angle of the implant object constituting the implant, such as a crown, fixture, or abutment, is performed through the object generator 40. To this end, the crown library 50 is first performed. Based on the size and shape of the crown corresponding to the tooth loss region is determined (S40).

7 is a flowchart illustrating a method of determining the size of a crown according to an embodiment of the present invention.

Referring to FIG. 7, the centrifugal boundary of the left and right second molar is received through the user interface unit 10 (S400).

FIG. 8 illustrates an example of receiving the centrifugal boundary of the left and right second molar. Referring to FIG. 8, a control bar 701 is generated and provided on the left and right sides of the arch line, and the user removes the control bar 701. It may be implemented to receive the centrifugal boundary (p1, p2) of the left and right second molar in such a way to move to a point corresponding to the centrifugal boundary of the second molar.

Subsequently, the object generation unit 40 calculates the length to the centrifugal plane boundary of the left and right second molar of the arch line using various known curve length calculation algorithms (S410).

As such, when the length of the arch line is calculated, the object generation unit 40 calculates the length of the arch line calculated in the crown library 50 defining the size of the crown for each tooth number according to the length of the reference arch line. To determine the size of the crown of the lost tooth number corresponding to the tooth loss region (S420). In this case, according to the definition of the crown library 50, in addition to the length of the arch line, additional information such as the patient's gender, age, race, and the shape of the patient's specific arch form may be used together.

However, when the length of the measured arch line up to the centrifugal boundary of the left and right second molar is not present in the crown library 50, the object generator 40 is closest to the length measured from the crown library 50. The crown size corresponding to the length of the reference arch line may be determined, or the crown size corresponding to the corresponding measurement length may be performed by interpolation based on the crown size value corresponding to the length of the reference arch line close to the measured length. May yield

Here, the lost tooth number is directly input to the user through the user interface unit 10 or is linked with an electronic medical record server to receive information about the lost tooth number or based on the tooth number assigned to each tooth area after dividing the tooth area. It can be understood as described above.

As such, when the size of the crown corresponding to the tooth loss area is determined, the object generation unit 40 according to the crown height reference set in the reference information storage unit 60 with respect to the height of the crown exposed to the top beyond the gingival boundary. A crown having a size determined in the tooth loss region is generated (S50). The crown may be created on the arch line, and the object creation portion 40 ensures that the lower portion of the crown does not fall beyond the gingival boundary of the tooth loss region beyond a predetermined criterion, and the upper portion of the crown further defines the occlusal surface. Can be created so that it does not go beyond the standard. For reference, the occlusal surface is a plane where the upper and lower teeth meet each other at the time of occlusion, and a part of the occlusal surface is input through the user interface unit 10 and is generated as a plane including the corresponding points or the image of the lower middle incisor is insulated through image recognition It may be automatically generated as a plane connecting the upper points by recognizing the buccal centrifugal cusps of the left and right second molar of the lower jaw.

On the other hand, since the crown library 50 is based on the average tooth size of many people, fine adjustment may be necessary depending on the patient. Accordingly, a process of adjusting the size of the crown generated based on the gingival boundary and the adjacent tooth boundary of the tooth loss region may be involved. Scaling may be done automatically or manually with user input via the user interface 10.

As such, when the planning of the crown is completed, the planning of the fixture and the abutment is then performed, and the object generator 40 may refer to the reference information storage unit 60 with respect to the distance from the gingival boundary to the top of the fixture. The fixture is generated in the lower part of the crown so as to satisfy the preset fixture height standard in S60. In this case, the fixture type corresponding to the tooth loss region may be selected from an implant library (not shown) having a list of fixture products by fixture manufacturer, type, and diameter / length.

In addition, the object generation unit 40 generates an abutment fastened to the crown so as to satisfy the crown thickness criteria preset in the reference information storage unit 60 with respect to the distance from the center of the top surface of the crown to the top of the abutment. (S70).

9 is a reference diagram for describing an example in which each implant object is generated according to reference information.

Referring to FIG. 9, an example in which implant objects are generated to satisfy a crown height criterion d1, a crown thickness criterion d2, and a fixture insertion height criterion d3 preset in the reference information storage unit 60 is illustrated. 9, the fixture (F) has a central axis (F ₀₎ of the crown (C) the central axis (C ₀₎ and the fixture (F) for this may be generated in the direction coincide with each other.

At this time, if the distance d1 and d2 is determined to satisfy the stored reference information, d4, which is the length at which the abutment AB is fastened to the crown C, is automatically determined. Therefore, although the reference information storage unit 60 may store d1 and d2 as described above, even if d1 and d4 or d2 and d4 are stored, the other one value may be automatically calculated, and thus, among the d1, d2, and d4. You can store any two values.

Meanwhile, the distance d5 between the gingival border (B _G ) and the alveolar bone boundary (B _B ) is a fixed value according to the patient's oral cavity structure, so that the distance to the top of the alveolar bone (B _B ) and the fixture is satisfied in order to satisfy d3 according to the reference information. The distance d6 is variable. For example, assuming that d3 according to the reference information is 3 mm and that the distance d5 between the patient's gingival border B _G and the alveolar bone border B _B is 2 to 2.5 mm, d6 will be 0.5 to 1 mm.

Here, the gingiva boundary and the alveolar bone boundary, which are used as a reference when generating an object, may be detected using various known contour detection algorithms based on brightness or color values of pixels in an image. For reference, the gingival border may be recognized in a CT scan in which the alveolar bone is well seen in the oral scan image in which soft tissues appear well.

As described above, the reference information storage unit 60 stores the optimal reference value for d1, d2, and d3 together with the minimum reference value that is minimum required for maintaining durability, and thus, corresponds to the optimal reference value primarily. When an object is created, but it is inevitable to follow the optimal reference value according to the oral cavity structure, the object may be implemented by applying the minimum reference value. On the other hand, the specific numerical value stored in the reference information storage unit 60 can be changed according to the user setting, of course.

Each step described above may be added to a new step or change the order according to the situation.

For example, if it is impossible to satisfy the reference information, another implant type is suggested, or when the direction of screw hole creation is the right side when planning the implant according to the screw type with respect to the missing tooth, the angle angle of the angle that can change the screw hole in the lingual direction A step of generating a guide message suggesting a cement type implant instead of a guide message suggesting a treatment may be further added.

In addition, after the implant object is generated by the object generator 40, the position of the object may be further modified based on a user input. When modifying an object through a user, when the modified content does not satisfy the reference information stored in the reference information storage unit 60, a notification message may be generated to effectively reduce the possibility of a procedure failure.

In addition, in the above-described embodiment, it has been described that the abutment is generated after the fixture is generated, but the abutment may be generated first, or the fixture and the abutment may be simultaneously generated.

As described above, according to the dental implant planning apparatus 100 and method according to the present invention, since the implant planning is performed based on the distance reference information between experimental and clinically verified implant objects, It is expected that not only the accuracy and reliability will be improved, but also the risk of implant fracture or damage after the procedure will be greatly reduced compared to the conventional programs, which mainly depended on the conventional programs.

The dental implant planning method according to the present invention can be implemented in various recording media such as a magnetic storage medium, an optical reading medium, a digital storage medium, which are written as a program that can be executed in a computer.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or in combinations of them. Implementations may be implemented for processing by, or to control the operation of, a data processing device, eg, a programmable processor, a computer, or multiple computers, a computer program product, ie an information carrier, for example a machine readable storage. It may be embodied as a computer program recorded on a device (computer readable medium). Computer programs, such as the computer program (s) described above, may be written in any form of programming language, including compiled or interpreted languages, and may be written as standalone programs or in modules, components, subroutines, or computing environments. It can be deployed in any form, including as other units suitable for use. The computer program can be deployed to be processed on one computer or multiple computers at one site or distributed across multiple sites and interconnected by a communication network.

Processors suitable for the processing of a computer program include, by way of example, both general purpose and special purpose microprocessors, and any one or more processors of any kind of digital computer. In general, a processor will receive instructions and data from a read only memory or a random access memory or both. Elements of a computer may include at least one processor that executes instructions and one or more memory devices that store instructions and data. In general, a computer may include one or more mass storage devices that store data, such as magnetic, magneto-optical disks, or optical disks, or receive data from, transmit data to, or both. It may be combined to be. Information carriers suitable for embodying computer program instructions and data include, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks, and magnetic tape, compact disk read only memory. ), Optical media such as DVD (Digital Video Disk), magneto-optical media such as floppy disk, ROM (Read Only Memory), RAM , Random Access Memory, Flash Memory, Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), and the like. The processor and memory may be supplemented by or included by special purpose logic circuitry.

In addition, the computer readable medium may be any available medium that can be accessed by a computer, and may include both computer storage media and transmission media.

While this specification contains numerous specific implementation details, these should not be construed as limited to any invention or the scope of the claims, but rather as a description of features that may be specific to a particular embodiment of a particular invention. It must be understood. Certain features that are described in this specification in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable subcombination. Furthermore, while the features may operate in a particular combination and may be initially depicted as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, the claimed combination being a subcombination Or a combination of subcombinations.

Likewise, although the operations are depicted in the drawings in a specific order, it should not be understood that such operations must be performed in the specific order or sequential order shown in order to obtain desirable results or that all illustrated operations must be performed. In certain cases, multitasking and parallel processing may be advantageous. Moreover, the separation of the various device components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and devices will generally be integrated together into a single software product or packaged into multiple software products. It should be understood that it can.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples for clarity and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

10: user interface unit 20: dental arch generating unit
30: loss area detection unit 40: object generation unit
50: crown library 60: reference information storage unit
70: Object Compensation

Claims (13)

In the dental implant planning method wherein each step is performed through the dental implant planning apparatus,
Detecting a missing tooth region based on an oral image of the patient;
Creating a crown in the tooth loss region so as to meet a predetermined crown height criterion with respect to the height of the crown exposed upwardly over the gingival boundary within the tooth loss region; And
And creating a fixture at the bottom of the crown to satisfy a predetermined fixture placement height criterion with respect to the distance from the gingival boundary to the top of the fixture.
The method of claim 1,
Generating the abutment fastened to the crown to satisfy a predetermined crown thickness criterion with respect to the distance from the center of the top of the crown to the top of the abutment. .
The method of claim 2,
The numerical value according to the crown height reference, the fixture placement height reference, and the crown thickness reference is defined for each implant type including at least one of cement type and screw type.
The method of claim 2,
And a numerical value according to the crown height criterion, the fixture placement height criterion, and the crown thickness criterion is defined by dividing the anterior tooth group and the posterior tooth group.
The method of claim 1,
Generating the fixture,
And the distance between the alveolar bone boundary and the upper end of the fixture is varied according to the distance between the gingival boundary and the alveolar bone boundary in the tooth loss area of the patient.
The method of claim 1,
Determining a crown size of a tooth number corresponding to the tooth loss area,
The step of generating the crown, the dental implant planning method, characterized in that for generating the crown having the determined size.
The method of claim 6,
Determining the crown size of the tooth number corresponding to the tooth loss area,
Generating an arch form line in the oral cavity image;
Receiving a centrifugal boundary of each of the left and right second molars through a user interface unit;
Calculating the length of the arch form line to the centrifugal plane boundary of the left and right second molar; And
Crown size of the tooth number corresponding to the tooth loss region by applying the length of the arch line to the centrifugal boundary of the left and right second molar to the crown library in which the crown size for each tooth number is defined according to the length of the reference arch Dental implant planning method comprising the step of determining.
A computer-readable recording medium having recorded thereon a program for executing the dental implant planning method according to any one of claims 1 to 7.
A loss region detection unit detecting a loss region of a tooth on the basis of an oral image of the patient;
Crown height criterion for the height of the crown exposed upwardly above the gingival boundary within the tooth loss area, fixture placement height criterion for the distance from the gingival boundary to the top of the fixture, and abutment abutment from the top center of the crown A reference information storage unit which stores at least one piece of reference information among crown thickness reference information about an interval to an upper end; And
And an object generator for generating crowns, fixtures, and abutments in the tooth loss region in response to the stored reference information.
The method of claim 9,
Further comprising a crown library is defined the size of the crown by tooth number along the length of the reference arch,
And the object generation unit determines a crown size of a tooth number corresponding to the tooth loss area based on the crown library, and generates a crown having the determined size.
The method of claim 9,
And an object corrector for modifying at least one object of the crown, the fixture, and the abutment based on an input through a user interface.
And the object corrector generates a notification message when the correction does not satisfy the reference information stored in the reference information storage unit.
The method of claim 9,
The dental implant planning apparatus when the screw-type implant planning, the object generation unit generates a screw hole into which the screw for connecting the fixture and the crown is inserted corresponding to the direction of the generated fixture.
The method of claim 12,
The object generator may include: a first angle suggesting an angle abutment of an angle capable of changing the screw hole in the lingual direction when the tooth corresponding to the tooth loss region corresponds to an anterior tooth and the screw hole is generated in the forward direction; And a guide message including at least one of an option and a second option for suggesting a cement type implant instead of the screw type.

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