KR102652901B1 - Method for generating relief region and apparatus for designing denture therefor - Google Patents

Abstract

A method for creating a relief area and a denture design device therefor are disclosed. A relief area generation method, a relief area generation method, and a denture design device therefor according to an embodiment generate a relief area including at least one of the incisor papilla and the median palatal suture from patient data, and include a predetermined thickness profile in the generated relief area. By applying , the user's manipulation can be minimized, the inconvenience can be reduced, and the patient's aesthetic satisfaction can be increased.

Description

Method for generating relief region and apparatus for designing denture therefor {Method for generating relief region and apparatus for designing denture therefor}

The present invention relates to dental image processing technology, and more specifically, to technology for designing dentures using dental images.

If a tooth or the tissue surrounding the tooth is damaged, the function and aesthetics of the tooth can be restored through prosthetic treatment using an artificial prosthesis. When one or more teeth are partially damaged, a crown covering the upper side of the damaged tooth can be manufactured and used as a prosthesis. However, if one or more teeth are missing, dentures that connect both teeth and the missing part, as if building a bridge using the surrounding teeth as pillars, can be used.

Dentures (dentures) are divided into partial dentures (partial dentures) that can be used by patients with some remaining teeth, and complete dentures (complete dentures) that restore teeth and absorbed gums in a state where there are no teeth at all. It can be.

Relief work is essential when making dentures. Relief is a process of providing a certain amount of free space to a specific part of the denture without direct contact with the tissue in order to reduce the irritation the denture exerts on the tissue (for example, gum and tooth tissue) based on the patient's data.

In order to perform relief work using the program, the user must create a relief area where necessary as if drawing directly on the patient data using a mouse. Therefore, in places where a large amount of relief is needed, the user may have to operate (for example, click) several times, and in areas that require essential manipulation, the user must manually operate each time to create a relief area, which is inconvenient. The results may vary depending on the user's skill level.

Korean registered patent 10-2244787 (2021.04.21)

According to one embodiment, a method for creating a relief area that improves user convenience as the device automatically creates and provides a relief area for executing the relief required for denture production, and a denture design device for the same. I suggest.

Furthermore, as the device accurately creates and provides a relief area, we propose a relief area creation method with improved accuracy and a denture design device for the same.

A method for generating a relief area according to an embodiment includes obtaining patient data, generating a relief area including at least one of an incisor papilla and a median palatal suture from the acquired patient data, and the generated relief area. and applying a predetermined thickness profile to.

The step of creating a relief area includes extracting landmarks related to the incisive papilla (IP: Incisive Papilla) from maxillary data, which is patient data, and generating an IP relief area including landmarks related to the incisive papilla. It can be included.

The step of creating a relief area includes extracting landmarks related to the incisor papilla and posterior palatal closure from the maxillary data, which are patient data, and using the landmarks related to the incisor papilla and posterior palatal closure to suture the median palate from the maxillary data. Extracting the Median Palatine Raphae (MPR) and creating an MPR relief area including the median palatine suture.

In the step of creating the MPR relief area including the median palatal suture, when the distance to the most posterior and posterior palatal closure of the IP relief area is vertically divided into three parts for the maxillary data, 2/3 in the posterior palatal closure direction A step of extracting a point that is, calculating an MPR distance by connecting the rearmost and the 2/3 points of the IP relief area, and two points whose horizontal width is spaced apart by a preset distance from the center of the MPR distance. It may include the step of creating an MPR relief area by connecting two points above and below the MPR distance.

The step of generating the relief area includes converting the patient's maxillary data into inflection data including inflection information, extracting feature points from the converted inflection data, and generating a relief region including the extracted feature points. May include steps.

The feature point may be at least one of an inflection point, a local maximum point, a local minimum point, and a vertex.

The step of generating a relief area including the extracted feature points includes measuring feature points around the incisor papilla from the inflection data and extracting a first measurement region connected to the measured feature points, and extracting a first measurement region connected to the measured feature points. It may include creating an IP relief area by connecting points spaced apart at a preset distance in the measurement area.

The step of generating a relief area including the extracted inflection points includes measuring feature points from the rearmost part of the incisor papilla of the inflection data in the posterior direction and extracting a second measurement area connected to the measured feature points, and extracting the extracted second measurement area. It may include generating an MPR relief area connecting points spaced apart at a preset distance in the second measurement area.

The method of generating a relief area may further include generating a palatal wrinkle relief area including palatal folds.

The relief area creation method may further include displaying a user graphic interface for modifying the created relief area on the screen, and modifying the relief area by user manipulation through the user graphic interface.

A denture design device according to another embodiment includes a data acquisition unit that acquires patient data, generates a relief area including at least one of an incisor papilla and a median palatal suture from the acquired patient data, and includes a relief area in the generated relief area. It includes a control unit that applies a predetermined thickness profile and an output unit that displays patient data including the relief area.

According to the method and device for generating a relief area according to an embodiment, the user's convenience can be improved as the device automatically creates and provides a relief area for executing relief essential for denture manufacturing. .

In particular, the device generates a relief area containing at least one of the incisor papilla and the median palatal suture from patient data and applies a predetermined thickness profile to the created relief area, thereby minimizing user manipulation and reducing hassle. there is.

Additionally, as the device creates and provides a relief area, accuracy is improved and the patient's aesthetic satisfaction can be increased.

Furthermore, accuracy can be improved by allowing the user to further modify the relief area provided by the device.

1 is a diagram illustrating the flow of a relief area creation method according to an embodiment of the present invention;
Figure 2 is a diagram showing an example of creating an IP relief area using IP according to an embodiment of the present invention;
Figure 3 is a diagram illustrating an example of creating an IP relief area using an MPR area according to an embodiment of the present invention;
4 is a diagram illustrating an example of inflection data conversion according to an embodiment of the present invention;
5 and 6 are diagrams showing an example of creating a relief area using inflection according to an embodiment of the present invention;
Figure 7 is a diagram showing the initial execution of a relief according to an embodiment of the present invention;
Figure 8 is a diagram showing an example of setting the size of a relief area according to an embodiment of the present invention;
Figure 9 is a diagram showing the configuration of a denture design device according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to provide common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In describing the embodiments of the present invention, if it is judged that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted, and the terms described below will be used in the embodiments of the present invention. These are terms defined in consideration of the function of , and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention illustrated below may be modified into various other forms, and the scope of the present invention is not limited to the embodiments detailed below. Examples of the present invention are provided to more completely explain the present invention to those skilled in the art.

1 is a diagram illustrating the flow of a method for creating a relief area according to an embodiment of the present invention.

Referring to Figure 1, the denture design device acquires patient data (S110). The patient data may be scan data, particularly scan data of the maxilla.

Subsequently, the denture design device includes at least one of an incisive papilla (IP, hereinafter referred to as 'IP') and a median palatine suture (MPR: Median Palatine Raphae, hereinafter referred to as 'MPR') from the acquired patient data. Create a relief area (S120). At this time, the denture design device can create a relief area according to preset standards, and can create the relief area by extracting feature points of data. Hereinafter, for convenience of explanation, the former will be referred to as the 'first generation method', and the latter will be referred to as the 'second generation method'.

Relief area generation using the 'first generation method' For example, the denture design device extracts IP and posterior palatal closure from maxillary data, which is one of the patient data, extracts MPR using IP and posterior palatal closure, and then extracts An MPR relief area containing the MPR can be created. Here, the MPR relief area may be an area including the MPR and a peripheral area within a predetermined distance around the MPR.

When creating the MPR relief area, the denture design device divides the distance to the most posterior and posterior palatal closure of the IP relief area vertically into thirds using maxillary data, which is one of the patient data, and divides 2/3 in the direction of posterior palatal closure. Extract the point where Next, the MPR distance is calculated by connecting between the rearmost and the above 2/3 points of the IP relief area. Next, an MPR relief area can be created by connecting two points separated by a preset horizontal width from the center of the MPR distance and two points above and below the MPR distance. An example of MPR relief area generation according to the 'first generation method' will be described later with reference to FIGS. 2 and 3.

Relief area generation using the 'second generation method' For example, in the relief area creation step (S120), the denture design device first converts maxillary data, which is one of the patient data, into inflection data including inflection information. At this time, the inflection information of the inflection data 50 may be expressed visually, for example, through a color map, brightness, or numerical information.

Next, the denture design device extracts feature points from the converted inflection data and then generates a relief area including the extracted feature points. Feature points may be, for example, inflection points, local maximum and minimum points, vertices, etc. Among them, an inflection point is a point where the concave shape of the curve changes, meaning points that change from convex upward to convex downward, or from convex downward to convex upward. Hereinafter, the description will focus on the inflection point among the feature points, but other feature points are equally applicable.

For example, the denture design device may measure inflection points around IP from inflection data and extract a first measurement area connected to the measured inflection points. Subsequently, the denture design device may create an IP relief area by connecting points spaced apart at a preset distance in the extracted first measurement area. An embodiment of this will be described later with reference to FIG. 4.

As another example, the denture design device may measure inflection points from the IP of the inflection data in the rearmost direction to the posterior direction and extract a second measurement area connected to the measured inflection points. Subsequently, the denture design device may generate an MPR relief area by connecting points spaced apart at a preset distance from the extracted second measurement area.

Examples of generating an IP relief area and an MPR relief area according to the 'second generation method' will be described later with reference to FIGS. 4 to 6.

In the relief area creation step (S120), the denture design device may additionally create a palatal wrinkle relief area including palatal wrinkles in addition to the IP and MPR described above. Here, the palatal fold relief area is an area including the palatal folds and the peripheral area within a predetermined distance around the palatal folds.

After the relief area creation step (S120), the denture design device displays a user graphic interface for modifying the relief area on the screen, and the relief area can be modified by user manipulation through the user graphic interface. For example, you can modify the size (width, length) of the relief area. An embodiment of this will be described later with reference to FIG. 8.

Next, the denture design device applies a predetermined thickness profile to the created relief area (S130). For example, the denture design device applies a thickness profile of a preset value (eg, 0.2 mm) to the relief area. Preset values can be changed by the user.

Applying a thickness profile For example, the denture design device can apply a thickness profile to the relief area such that at some reference point in the relief area the largest value, e.g. 0.2 mm, converges to zero at the edges of the relief area. As another example, the denture design device may apply a thickness profile to have a uniform thickness throughout the relief area.

The operation of creating a relief area and applying a thickness profile is a relief operation, based on the patient's patient data, in order to reduce the irritation exerted by the denture on some localized area of \u200b\u200bthe tissue (e.g. gums, tooth tissue). This is a process of giving a certain amount of space to the denture so that it does not come into direct contact with the tissue. The relief area is determined according to the size and shape of such local area.

Figure 2 is a diagram illustrating an example of creating an IP relief area using IP according to an embodiment of the present invention.

Referring to FIG. 2, the denture design device creates an IP relief area 320 using IP 310, one of the landmarks used in denture arrangement, in the patient's maxillary data 30. At this time, the denture design device may create the IP relief area 320 by connecting points spaced apart from the IP 310 at a first distance left and right and a second distance up and down. For example, the denture design device can create the IP relief area 320 by connecting points that are 4 mm apart on the left and right, and 5 mm apart on the top and bottom, centered on the IP 310. If the first distance and the second distance are different, the IP relief area 320 becomes oval, and if they are the same, it becomes circular. The first distance and the second distance are set in advance and can be changed by the user. IP (310) is a slightly raised portion at the front end of the midline (300) of the palate. Since the front and rear length of the IP (310) is 5.9 mm on average and the maximum is about 8 mm, the IP relief area 320 is not only the length of the IP (310) itself, but also has a first distance to allow for connection with the surrounding area, The second distance can be set in advance.

Figure 3 is a diagram illustrating an example of creating an IP relief area using an MPR area according to an embodiment of the present invention.

Referring to Figure 3, the denture design device creates an MPR relief area 420. For this purpose, the denture design device divides the distance from the maxillary data 30 to the rearmost 422 of the IP relief area 320 and the posterior palatal closure 410 vertically into thirds, and then divides the distance from the maxillary data 30 to the posterior palatal closure 410. After extracting the point 421 that is 2/3 in the direction and connecting the rearmost 422 and the 2/3 point 421 of the IP relief area 320 to calculate the MPR distance 426, MPR Two points (423, 424) spaced apart from the center (425) of the distance (426) by a preset distance (e.g., 3 mm) in horizontal width (one side) and two points (421, 422) above and below the MPR distance (426). The MPR relief area 420 can be created by connecting. The MPR relief area 420 may have an oval shape, as shown in FIG. 3, but the shape is not limited thereto. The horizontal width and downward extension length of the MPR relief area 420 are set in advance and can be changed by the user. In the case of MPR, since its location and shape vary from person to person, the denture design device can preset the horizontal width and downward extension length of the MPR relief area 420 so as to include most MPRs. The posterior palatal closure 410 is the soft tissue at the border of the soft palate and the hard palate.

Figure 4 is a diagram illustrating an example of inflection data conversion according to an embodiment of the present invention.

Referring to FIG. 4, the denture design device converts the maxillary data 30 into inflection data 50 including inflection information, and then creates a relief area using feature points, for example, inflection points, in the inflection data 50. do. At this time, the inflection information of the inflection data 50 may be expressed visually, for example, through a color map, brightness, or numerical information. Additionally, inflection points are points where the concave shape of the curve changes, meaning points that change from convex upward to convex downward, or from convex downward to convex upward. The denture design device can change the maxillary data 30 and inflection data 50 as needed according to the user's selection and provide them through the screen.

Figures 5 and 6 are diagrams showing an example of creating a relief area using inflection according to an embodiment of the present invention.

Referring to FIGS. 5 and 6 , the denture design device extracts feature points from the inflection data 50 around the IP 310 and creates an IP relief area 612 including the extracted feature points. Feature points may be, for example, inflection points, local maximum and minimum points, vertices, etc.

For example, the denture design device measures inflection points around the IP 310 and extracts a first measurement area 610 connected to the measured inflection points. Next, the denture design device creates an IP relief area 612 by connecting points spaced apart by a preset distance (eg, 1 mm) in the extracted first measurement area 610. The IP relief area 612 has an oval shape in FIGS. 5 and 6, but the shape is not limited thereto. The preset distance is set in advance and can be changed by the user. At this time, as the denture design device generates the IP relief area 612 that widely accommodates the surrounding area by providing a margin of a preset distance (e.g., 1 mm) from the first measurement area 610, the relief for the inflected portion is increased. possible.

The denture design device measures the inflection points corresponding to the area that protrudes convexly from the rearmost part of the IP to the posterior part based on the inflection data 50, extracts the second measurement area 620 connected to the measured inflection points, and extracts the extracted second measurement area 620. 2 MPR relief area connecting points separated by a preset distance in the measurement area 620 (e.g., extending 2 mm in width on one side to the left and right based on the second measurement area, extending 5 mm downward from the rearmost area) (622) can be generated. 5 and 6, the MPR relief area 622 has an oval shape, but the shape is not limited thereto. The preset distance is set in advance and can be changed by the user. At this time, as the denture design device generates the MPR relief area 622 that accommodates the surrounding area wider by providing a margin of a preset distance than the second measurement area 620, relief for the inflected portion is possible.

Figure 7 is a diagram showing the initial execution of a relief according to an embodiment of the present invention.

Referring to FIG. 7, the denture design device applies a thickness profile of a preset value (eg, 0.2 mm) to the relief area described with reference to FIGS. 2 to 6. For example, a thickness profile can be applied to the relief area such that at some reference point in the relief area the largest value is, say 0.2 mm, and at the edges of the relief area it converges to 0. Preset values can be changed by the user.

FIG. 7 shows an example of applying a thickness profile to the IP relief area 612 and the MPR relief area 622 created with reference to FIGS. 5 and 6 . The MPR relief area 622 has a horizontal width consisting of a left point 626 and a right point 628. A cross-sectional view of the upper jaw model data viewed from the front by connecting the left point 626 and the right point 628 of the MPR relief area 622 is shown at reference numeral 70. At this time, the thickness profile of the MPR relief area 622 has a form in which the relief center 624 is piled up by adding a preset thickness to the maxillary model data.

Figure 8 is a diagram illustrating an example of setting the size of a relief area according to an embodiment of the present invention.

Referring to Figure 8, the denture design device can modify the size (width, length) of the relief area described with reference to Figures 2 to 6 through user settings. For example, as shown in Figure 8, the denture design device can modify the upper, lower, left, and right lengths of the IP relief area (320 or 612) by user manipulation, and the MPR relief area (420 or 622) The left, right, top, and bottom lengths can be modified by user manipulation. Furthermore, the entire area of at least one of the IP relief area 320 or 612 and the MPR relief area 420 or 622 can be enlarged or reduced by user manipulation. To this end, as shown in FIG. 8, the denture design device displays a direction key on the screen, and the user can modify the size (width, length) of the relief area through the operation of selecting the direction key. Alternatively, the denture design device displays (+) and (-) keys on the screen on at least one of the top, bottom, left, and right sides of the IP relief area (320 or 612) and the MPR relief area (420 or 622), and allows the user to You can modify the size (width, length) of the relief area by selecting the (+) or (-) key.

Figure 9 is a diagram showing the configuration of a denture design device according to an embodiment of the present invention.

Referring to FIG. 9, the denture design device 1 is an electronic device capable of executing an image processing program. Electronic devices include personal computers (PCs), laptops, tablets, smartphones, and mobile phones. Medical image processing programs include design programs, scanning programs, and CAD programs. This medical image processing program may be a denture design program for manufacturing dentures for patients, but may also be applied to other general medical image processing programs. Hereinafter, for convenience of explanation, the denture design program will be used as an example, but the same can be applied to other programs if image processing is possible.

The denture design device 1 according to one embodiment includes a data acquisition unit 10, a storage unit 12, a control unit 14, an input unit 16, and an output unit 18.

The data acquisition unit 10 acquires patient data from teeth including the patient's damaged teeth. Patient data may include, for example, scan data of the patient, where the scan data may be divided into maxilla data and mandible data.

The storage unit 12 stores data such as information necessary for executing the operation of the denture design device and information generated according to the execution of the operation. For example, patient data of individual patients is stored in the storage unit 12, and this can be provided to the control unit 14.

The control unit 14 designs the patient's dentures through control by a computer program. The control unit 14 according to one embodiment creates a relief area for denture design and applies a predetermined thickness profile to the created relief area.

The control unit 14 may create a relief area according to a preset standard, or may create a relief area by extracting an inflection point of data. The former is called the ‘first generation method’, and the latter is called the ‘second generation method’.

According to the 'first generation method', the control unit 14 can create an IP relief area using the IP 310, which is a landmark. An example of generating an IP relief area according to the 'first generation method' is as described above with reference to FIG. 2. Additionally, the control unit 14 can create an MPR relief area using the landmarks IP and retropalatal closure.

Furthermore, the control unit 14 may additionally create a palatal wrinkle relief area including palatal folds in addition to the IP relief area centered on the IP or the MPR relief area centered on the MPR.

According to the 'second generation method', the control unit 14 converts maxillary data, which is patient data, into inflection data including inflection information, extracts feature points from the converted inflection data, and then generates a relief area including the extracted feature points. do. For example, the control unit 14 measures inflection points around IP in the inflection data and creates an IP relief area including the measured inflection points.

As another example, the control unit 14 measures inflection points from the extreme rear to the rear of the IP relief area of the inflection data and generates an MPR relief area including the measured inflection points.

The control unit 14 applies a predetermined thickness profile to the relief area created by the 'first generation method' or the 'second generation method'. For example, the control unit 14 applies a thickness profile of a preset value (eg, 0.2 mm) to the relief area. Preset values can be changed by the user.

The input unit 16 receives a user manipulation signal. For example, the input unit 16 may receive a user manipulation signal for correction from the user targeting the relief area created by the control unit 14. The control unit 14 may modify the relief area according to a user manipulation signal, and the output unit 18 may output the modified relief area. For example, you can modify the size (width, length) of the relief area.

When the control unit 14 displays a screen for selecting a 'first generation method' or 'second generation method' through the output unit 18, the input unit 16 inputs a user operation signal to select a predetermined method. You can receive it.

The output unit 18 displays the relief area created through the control unit 14 as a virtual graphic object on the screen and displays a screen for executing the relief. The output unit 18 may display a graphical interface for user modification of the relief area on the screen. An embodiment of this is the same as described above with reference to FIG. 8.

So far, the present invention has been examined focusing on its embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

Claims (11)

In the method of creating a relief area using a denture design device, the denture design device
Obtaining patient data;
From the acquired patient data, a relief area including the Incisive Papilla (IP) relief area and the Median Palatine Raphae (MPR) relief area was created. steps; and
applying a predetermined thickness profile to the created relief area; Includes,
The IP relief area is oval or circular centered on IP,
The MPR relief area is characterized in that the relief area creation method is oval including the posteriormost point of the IP area and the posterior 2/3 of the distance to posterior palate closure. The method of claim 1, wherein creating the relief area comprises
Extracting landmarks related to IP from maxillary data, which is patient data; and
creating an IP relief area including landmarks related to the IP;
A method of generating a relief area comprising: The method of claim 1, wherein creating the relief area comprises
Extracting landmarks related to IP and posterior palatal closure from maxillary data, which is patient data;
Extracting MPR from maxillary data using landmarks related to IP and posterior palatal closure; and
creating an MPR relief area including the MPR;
A method of generating a relief area comprising: The method of claim 3, wherein generating an MPR relief area including the MPR comprises
When the distance to the posteriormost part of the IP relief area and the posterior palatal closure is vertically divided into three parts for the maxillary data, extracting a point that is 2/3 in the posterior palatal closure direction;
Calculating the MPR distance by connecting the rearmost and the 2/3 points of the IP relief area; and
Creating an MPR relief area by connecting two points spaced apart from the center of the MPR distance by a preset horizontal width and two points above and below the MPR distance;
A method of generating a relief area comprising: The method of claim 1, wherein creating the relief area comprises
Converting the patient's maxillary data into inflection data including inflection information;
Extracting feature points from the converted inflection data; and
generating a relief area including extracted feature points;
A method of generating a relief area comprising: According to claim 5,
A method for generating a relief area, wherein the feature point is at least one of an inflection point, a local maximum point, a local minimum point, and a vertex. The method of claim 5, wherein the step of generating a relief area including the extracted feature points includes
Measuring feature points around the IP from the inflection data and extracting a first measurement area connected to the measured feature points; and
Creating an IP relief area by connecting points spaced apart at a preset distance from the extracted first measurement area;
A method of generating a relief area comprising: The method of claim 5, wherein generating a relief area including the extracted inflection points comprises:
Measuring feature points from the rearmost IP of the inflection data toward the rear and extracting a second measurement area connected to the measured feature points; and
Creating an MPR relief area connecting points spaced apart from a preset distance in the extracted second measurement area;
A method of generating a relief area comprising: The method of claim 1, wherein the relief area creation method is
creating a palatal fold relief area including the palatal folds;
A method of generating a relief area further comprising: The method of claim 1, wherein the relief area creation method is
displaying a user graphical interface for modifying the created relief area on the screen; and
modifying the relief area by user manipulation through the user graphical interface;
A method of generating a relief area further comprising: A data acquisition unit that acquires patient data;
a control unit that generates a relief area including an IP relief area and an MPR relief area from the acquired patient data and applies a predetermined thickness profile to the generated relief area; and
an output unit that displays patient data including the relief area; Includes,
The IP relief area is oval or circular centered on IP,
The MPR relief area is an oval shape comprising the rearmost part of the IP area and the posterior 2/3rd of the distance to the posterior palate closure.