KR20210037038A - Method for designing prosthetic material and apparatus thereof - Google Patents

Abstract

A method for designing a prosthetic material and an apparatus therefor are disclosed. According to the method for designing the prosthetic material and the apparatus therefor according to an embodiment, the feature information on teeth in a template model is stored in advance, and when designing the prosthetic material, the prosthetic material is designed by using pre-stored feature information of the teeth.

Description

TECHNICAL FIELD [Method for designing prosthetic material and apparatus thereof]

The present invention relates to a dental image processing technology, and more particularly, to a technology for designing a prosthesis required for dental treatment in a dental image.

In the dental field, prosthetic procedure refers to restoring a damaged tooth using a prosthesis. Prostheses include Crown, Inlay, Onlay, Coping, and Pontic. Before performing the actual prosthesis procedure, a virtual prosthesis suitable for the patient is selected through simulation, and the prosthesis is virtually placed at a target location and processed. This process is done through the Computer Aided Design (CAD) program.

When designing a prosthesis required for dental treatment using a dental CAD program, a user selects a desired tooth from a pre-designed template model of the prosthesis (also referred to as'library') to design the prosthesis. Since each person has a different tooth shape, there are various template models provided by the program. If the dental CAD program prepares a list of various template models in advance and shows them to the user, the user directly selects a tooth having a desired shape from the list and places the selected tooth at the position where the prosthesis will be designed, and then adjacent teeth and opposing teeth. The shape of the tooth is deformed so that it has an appropriate collision. At this time, if the arrangement and the distance between adjacent teeth and opposing teeth are adjusted using only the shape data of the teeth in the program, the calculation amount increases and the final shape may be deformed into a shape that the user does not want.

According to an embodiment, a prosthesis design method and apparatus for designing a prosthesis that is faster, more accurate and easier to design a prosthesis are proposed.

A prosthesis design method according to an embodiment includes the steps of pre-storing feature information on teeth in a template model, obtaining scan data of a patient, and pre-stored feature information of teeth on the obtained scan data. And designing the prosthesis by using.

In the step of storing feature information about teeth in advance, feature information including tooth axis information, tooth opposing teeth and adjacent teeth contact information, and tooth meridian information for each tooth may be matched and stored. . The tooth axis information includes information on the occlusal surface axis, mesial surface axis, and buccal surface axis of the tooth, and the contact information of the tooth is in contact with the adjacent teeth of the tooth. It may include a proximal contact point, a facial cusp tip point in contact with the opposing tooth, and a lingual cusp tip point.

The step of designing the prosthesis may include arranging the crown in the scan data using the tooth axis information included in the tooth feature information. The step of arranging the crown includes: aligning the scan data with the three-dimensional x, y, and z axes, calculating the tooth placement axis in the scan data using the tooth number of the target tooth to which the crown is to be designed, and It may include checking the axis information of the tooth previously stored as the feature information, aligning the axis of the tooth to the calculated tooth arrangement axis, and matching the axis center point of the tooth with the center of the margin line.

The step of designing a prosthesis may include adjusting a spacing between adjacent teeth of the crown and opposing teeth arranged in the scan data by using contact information of teeth included in the tooth feature information. The step of adjusting the spacing between the adjacent teeth and the opposing teeth of the crown includes acquiring information on the points of contact with the adjacent teeth and the occlusal teeth, checking the contact information of the previously stored teeth, and obtaining the contact of the teeth. According to the automatic adjustment according to the information, it may include the step of adjusting the spacing between the adjacent teeth and the opposing teeth of the crown.

The step of designing the prosthesis may include combining the inner and outer surfaces of the crown using the tooth meridian information included in the tooth feature information. The step of combining the inner and outer surfaces of the crown is to check the alveolar line information previously stored as tooth feature information on the outer surface of the crown and delete the data below the alveolar line so that the boundary of the outer surface of the crown becomes the alveolar line. And, transforming the shape of the outer surface of the crown so that the boundary of the outer surface of the crown reaches the boundary of the inner surface of the crown, and combining the outer surface of the deformed crown with the inner surface of the crown.

A method for designing a prosthesis according to another embodiment includes generating a margin line as a junction portion between an outer surface and an inner surface of a crown, generating an inner surface of the crown, and storing tooth axis information included in the previously stored tooth feature information. By using the step of arranging the outer surface of the crown in the scan data, and adjusting the spacing between the adjacent teeth and the opposing teeth using the contact information of the teeth included in the feature information of the teeth stored in advance for the crown on which the outer surface is disposed. Deforming the shape of the crown, and combining the inner and outer surfaces of the crown using the tooth meridian information included in the previously stored tooth feature information.

The prosthesis design method may further include creating a bridge connector connecting the successive crowns.

A prosthesis design apparatus according to another embodiment includes a data acquisition unit that acquires scan data of a patient, and pre-stores tooth feature information including axis information of teeth in a template model, and contact information with opposing teeth and adjacent teeth. Select a tooth from the storage unit and the template model, and place the selected tooth on the scan data using the tooth axis information. It includes a control unit to adjust the interval.

The control unit aligns the scan data with the three-dimensional x, y, and z axes, calculates the tooth placement axis in the scan data using the tooth number of the target tooth for which the crown is to be designed, and stores the tooth axis as tooth feature information in advance. You can check the information, align the tooth axis with the calculated tooth placement axis, and match the axis center point of the tooth with the center of the margin line.

The control unit acquires information on the point of contact with the adjacent teeth and occlusal teeth, checks the previously stored contact information of the teeth, and automatically adjusts the contact of the teeth according to the acquired information. You can adjust the spacing of.

The tooth characteristic information further includes information on the meridian line of the tooth, and the controller may combine the inner surface and the outer surface of the crown using the previously stored alveolar line information. The control unit checks the alveolar line information previously stored as tooth feature information on the outer surface of the crown, deletes the data below the alveolar line so that the outer surface of the crown becomes the alveolar line, and the outer surface of the crown is aligned with the inner surface of the crown The shape of the outer surface of the crown is deformed so that it can be reached, and the outer surface of the deformed crown can be combined with the inner surface of the crown.

According to the prosthesis design method and the apparatus according to an embodiment, the tooth feature information is stored separately before designing the prosthesis and the tooth feature information stored in advance is used when designing the prosthesis, so that the prosthesis of the shape desired by the user is faster and more accurate. Can be designed as.

For example, the axis information of the tooth can be stored and the tooth can be accurately placed in the scan data of the mandible or maxilla by using this axis information when placing the tooth, and contact information of the opposing teeth and adjacent teeth is stored and contact information is stored. By using this, the user can adjust the distance between adjacent teeth and surrounding teeth in a desired shape. In addition, when the tooth meridian information is stored and the inner surface and the outer surface of the prosthesis are combined, a prosthesis can be created in a more natural shape if the boundary of the inner surface and the alveolar line of the outer surface are connected.

Since the feature information of the tooth to be placed and processed in the patient's scan data is known in advance, it is not necessary to separately find out the tooth feature information, and the user can design a prosthesis having a desired shape more quickly and accurately than otherwise. In this case, if the tooth feature information is not used, there is no need for an algorithm or calculation process required. For example, in order to calculate the axis of the tooth, it is necessary to calculate the axis using a bounding box such as OBB or AABB, and in the case of the alveolar line, the alveolar line is separately used to separate the crown and the root. It is possible to eliminate the process of generating and so on. Furthermore, it is easy to fabricate a prosthesis in a shape desired by a user by using tooth axis information, contact information, and alveolar line information.

1 is a view showing the configuration of a prosthesis design device according to an embodiment of the present invention,
2 is a view showing the flow of a prosthesis design method according to an embodiment of the present invention,
3 is a view showing axis information of a tooth according to an embodiment of the present invention;
4 is a view showing contact information of teeth according to an embodiment of the present invention;
5 is a view showing information on the meridian line of a tooth according to an embodiment of the present invention;
6 is a view showing a storage form of tooth characteristic information according to an embodiment of the present invention;
7 is a view showing a prosthesis design process using tooth feature information of the template model of FIG. 2 according to an embodiment of the present invention;
8 is a view showing axis information of a crown when a crown is disposed using axis information of a tooth according to an embodiment of the present invention;
9 is a view showing a state of arranging a crown in scan data using axis information of a tooth according to an embodiment of the present invention;
FIG. 10 is a view showing a state of adjusting a spacing between adjacent teeth and opposing teeth of a crown disposed in scan data using contact information of teeth according to an embodiment of the present invention;
FIG. 11 is a diagram illustrating a combination of an outer surface and an outer surface of a crown using information on a tooth meridian line according to an exemplary embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted, and terms to be described later are in the embodiment of the present invention. These terms are defined in consideration of the functions of the user and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

Combinations of each block of the attached block diagram and each step of the flowchart may be executed by computer program instructions (execution engine), and these computer program instructions are used on a processor of a general-purpose computer, special purpose computer, or other programmable data processing device. As can be mounted, the instructions executed by the processor of a computer or other programmable data processing device generate means for performing the functions described in each block of the block diagram or each step of the flowchart.

These computer program instructions may also be stored in a computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing device to implement a function in a particular manner, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture in which the instructions stored in the block diagram contain instruction means for performing the functions described in each block of the block diagram or each step of the flowchart.

In addition, since computer program instructions can be mounted on a computer or other programmable data processing device, a series of operation steps are performed on a computer or other programmable data processing device to create a computer-executable process. It is also possible that the instructions for performing the data processing apparatus provide steps for executing the functions described in each block in the block diagram and in each step in the flowchart.

In addition, each block or each step may represent a module, segment, or part of code containing one or more executable instructions for executing specified logical functions, and in some alternative embodiments mentioned in the blocks or steps. It should be noted that it is also possible for functions to occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, and the blocks or steps may be performed in the reverse order of a corresponding function as necessary.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention exemplified below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art to which the present invention pertains.

1 is a view showing the configuration of a prosthesis design apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the prosthesis design device 1 performs a prosthesis design in order to help prosthesis teeth in an actual dentistry. In prosthetic design, a patient's tooth data is acquired, a virtual tooth is retrieved from a template model through control by a computer program, and it is virtually placed at the target tooth position of the tooth data, and the shape is drawn. It means a series of processing processes. The target is a damaged tooth that requires a prosthesis.

Before designing a prosthesis, the prosthesis design apparatus 1 according to an embodiment separately stores characteristic information of teeth in a template model, and designs a prosthesis using tooth characteristic information previously stored at the time of designing the prosthesis. The design of the prosthesis includes placement of the prosthesis, adjustment of the distance between adjacent and opposing teeth of the prosthesis, and the process of joining the inner and outer surfaces of the prosthesis, and the like. The adjacent teeth are actual teeth positioned on the left and right of the target tooth, and the opposing teeth are actual teeth positioned above or below the target tooth and in a antagonistic relationship.

When designing a prosthesis, it is possible to process data more quickly by using pre-stored tooth feature information, and to automatically manufacture a prosthesis in a shape desired by the user. The prosthesis includes a crown, an inlay, an onlay, a coping, a pontic, and the like, and will be described with a focus on the crown for ease of explanation hereinafter.

In the present invention, feature information of teeth in a template model is separately stored before designing a prosthesis, and a prosthesis is designed more quickly and accurately by using the feature information of teeth stored in advance when designing a prosthesis. As the prosthesis is designed using the characteristic information of the tooth, the user can easily manufacture the prosthesis in the shape desired by the user. In addition, the time taken to design can be considerably shortened compared to not using tooth feature information. If tooth feature information is not used, the axis must be calculated using a bounding box such as OBB or AABB to calculate the tooth axis, and in the case of the alveolar line, an algorithm that can separate the crown and the root is separately. Should be used to create the alveolar line. Even if tooth axis information, contact points, and alveolar lines are automatically generated using an algorithm, it is difficult to manufacture a prosthesis in a shape desired by a user.

The prosthesis design device 1 is an electronic device for designing a prosthesis by executing a dental program such as a dental CAD program. Electronic devices include computers, notebook computers, laptop computers, tablet PCs, smartphones, mobile phones, personal media players (PMPs), personal digital assistants (PDAs), and the like. In addition to the dental CAD program, the dental program includes a guide program, a scanning program, and a medical image processing program. In addition, it can be applied to other general medical programs in addition to dental prosthetic surgery.

Hereinafter, the configuration of the prosthesis design apparatus 1 having the above-described characteristics will be described later.

Referring to FIG. 1, a prosthesis design apparatus 1 according to an exemplary 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 image data from a patient. Image data necessary for prosthetic surgery include scan data and CT data. The data acquisition unit 10 may execute scan data and CT data in a program or load data stored in a web page and a server.

The scan data is data with information on actual teeth including damaged teeth. The scan data may be obtained by scanning a gypsum model created after a patient's mouth with a 3D scanner. As another example, it may be obtained by scanning the inside of the patient's oral cavity using a 3D intra-oral scanner. The acquired scan data may be stored in the storage unit 12. CT data can be obtained by generating a patient's head tomography images using CT (Computed Tomography, computed tomography), segmenting the boundary of the tooth from each tomography image, and then combining them into one. These scan data and CT data are images obtained by photographing the maxillary teeth under the maxillary teeth with the patient's mouth open, the images obtained by photographing the mandibular teeth above the mandibular teeth with the mouth open, and the local area with the mouth closed. Includes imaging, oral radiographs, etc.

The storage unit 12 stores various types of data, such as information necessary for the operation of the prosthesis design device 1 and information generated according to the operation. In the storage unit 12 according to an embodiment, feature information of teeth in the template model is previously stored. The tooth characteristic information may be matched with each tooth and stored in a separate file format. Tooth characteristic information is largely divided into three types: axis information, contact information, and cervical line information. Among tooth feature information, axis information will be described later with reference to FIG. 3, contact information with reference to FIG. 4, and cervical line information with reference to FIG. 5, respectively. The storage unit 12 may provide tooth characteristic information to the control unit 14.

The control unit 14 controls each component while establishing a prosthetic surgery plan through control by a computer program. The control unit 14 manages screen information displayed on the screen through the output unit 18, and performs a simulation of placing a virtual prosthesis object in a medical image. A medical image in which a virtual object is placed refers to a multidimensional image, such as 2D or 3D, showing the patient's tooth arrangement created to establish a prosthetic surgery plan. Various types of images, such as X-ray, CT, panoramic images, oral scan images, images generated through reconstruction, and images that match a plurality of images, can be used for prosthetic surgery planning.

The control unit 14 according to an embodiment selects a tooth to be placed on the scan data from the template model and arranges the selected tooth on the scan data using axis information. Then, the distance between the adjacent teeth and the adjacent teeth is adjusted by using the contact information of the arranged teeth and the adjacent teeth.

Tooth arrangement using tooth axis information For example, the control unit 14 aligns the scan data in three-dimensional x, y, and z axes, and then arranges the teeth in the scan data using the tooth number of the target tooth for which the crown is to be designed. Compute the axis. Then, by checking the tooth axis information stored in advance as the tooth feature information, the tooth axis is aligned with the calculated tooth placement axis. Furthermore, the center point of the axis of the tooth is aligned with the center of the margin line.

Adjustment of the spacing between adjacent teeth and opposing teeth using contact information of teeth For example, the control unit 14 acquires information on the points of contact with the adjacent teeth and occlusal teeth, and checks the previously stored contact information of the teeth to Automatically adjusts the contact of the person according to the acquired information. Accordingly, it is possible to adjust the spacing between the adjacent teeth and the opposing teeth of the crown. Information on a point of contact with the adjacent teeth and occlusal teeth may be input from the user through the input unit 16.

The control unit 14 according to an embodiment combines the inner surface and the outer surface of the crown using the previously stored alveolar line information. For example, the control unit 14 checks the alveolar information previously stored as tooth feature information on the outer surface of the crown, and deletes the data below the alveolar line so that the boundary of the outer surface of the crown becomes the alveolar line. Subsequently, the shape of the outer surface of the crown is deformed so that the boundary of the outer surface of the crown reaches the boundary of the inner surface of the crown, and the deformed outer surface of the crown is combined with the inner surface of the crown.

The output unit 18 displays the image data on a screen. In this case, the output unit 18 may display a simulation in which a virtual object is placed at an implantation position of the image data before performing an actual prosthetic treatment procedure. The input unit 16 receives a user manipulation signal. For example, a user operation for adjusting a prosthesis parameter is input.

2 is a diagram illustrating a flow of a method for designing a prosthesis according to an embodiment of the present invention.

Referring to FIG. 2, the prosthesis design apparatus stores feature information of teeth in a template model in advance (S210). The tooth characteristic information may be matched with each tooth and stored in a separate file format. Tooth characteristic information is largely divided into three types: axis information, contact information, and cervical line information. Among tooth feature information, axis information will be described later with reference to FIG. 3, contact information with reference to FIG. 4, and cervical line information with reference to FIG. 5, respectively.

Subsequently, the prosthesis design apparatus designs a prosthesis using the previously stored tooth feature information (S220). A detailed configuration of the prosthesis design step S220 using tooth feature information will be described later with reference to FIG. 7.

3 is a diagram illustrating axis information of a tooth according to an embodiment of the present invention.

3, the axis information corresponds to the occlusal surface axis 310, the mesial surface axis 320, and the buccal surface axis 330 according to the position of the tooth. It contains information about the axis to be played. These axes can be stored as vector values. The axial information can be used when designing the crown and placing the teeth on the scan data of the mandible or maxilla.

4 is a diagram illustrating contact information of teeth according to an embodiment of the present invention.

Referring to FIG. 4, contact information refers to information on a point of contact with an opposing tooth and an adjacent tooth after placing a tooth in the scan data. Two proximal contact points (410-1, 410-2) in contact with adjacent teeth, and two facial cusp tip points in contact with opposing teeth (420-1, 420) It can be classified into -2) and two lingual cusp tip points (430-1, 430-2) in contact with the opposing teeth. This information can be stored as 3D point information. This contact information can be used to deform the tooth shape by arranging the tooth selected from the template model in the scan data when designing the crown, and then adjusting the spacing between the opposing tooth and the adjacent tooth according to the distance specified by the user. 4 shows that the contact information of the teeth is selected and stored by the user.

5 is a diagram illustrating information on a tooth meridian line according to an embodiment of the present invention.

Referring to FIG. 5, the meridian line information 510 is a point at which a crown and a root of a tooth are separated. The alveolar line information 510 may be stored as a list of 3D points. The alveolar line information 510 may be used as a junction point of the outer surface when the inner surface and the outer surface of the crown are later combined.

6 is a diagram illustrating a storage form of tooth feature information according to an embodiment of the present invention.

Referring to FIG. 6, the tooth characteristic information includes axis information 610, contact information 620, and alveolar line information 630, and tooth characteristic information may be matched and stored for each tooth in a template model. For example, the axis information 610 includes the occlusal surface axis (vx1, vy1, vz1) of the tooth, the mesial surface axis (vx2, vy2, vz2), and the buccal surface axis. )(vx3, vy3, vz3). The contact information 620 includes proximal contact points (cx1, cy1, cz1), facial cusp tip points (cx2, cy2, cz2), and lingual cusp points (Lingual Cusp). Tip Point) can be expressed as (cx3, cy3, cz3). The alveolar line information 510 is [(x1, y1, z1), (x2, y2, z2), (x3, y3, z3),... It can be expressed as ]. The tooth information of this template model is used to design a prosthesis such as a crown.

7 is a diagram illustrating a prosthesis design process using tooth feature information of the template model of FIG. 2 according to an embodiment of the present invention.

Referring to FIG. 7, the prosthesis design process using tooth feature information consists of the following steps. The prosthesis design apparatus generates a margin line, which is a joint portion between the outer and inner surfaces of the crown (S710), and creates a space so that the adhesive can enter the inner shape to create an inner shape (S720). When the inner shape of the crown is generated, the outer surface of the crown is placed in the scan data (S730), and the shape of the crown is deformed by adjusting the distance between the adjacent teeth and the opposing teeth for the crown on which the outer surface is disposed (S740). Finally, the design is finished by combining the inner and outer surfaces of the crown (S750). The pre-stored tooth feature information (axis information, contact information, alveolar line information) is not used in all stages of the prosthetic design process, but the crown placement step (S730), the adjacent teeth and opposing teeth gap adjustment step (S740), the inner surface of the crown And it can be utilized in the outer surface bonding step (S750).

Furthermore, when designing a bridge when designing a prosthesis, the step of creating a bridge connector may be further included. Bridge connectors can be used to connect two or more consecutive prostheses.

FIG. 8 is a view showing axis information of a crown when a crown is placed using axis information of a tooth according to an embodiment of the present invention, and FIG. 9 is a view showing scan data using axis information of a tooth according to an embodiment of the present invention. It is a diagram showing a state of arranging the crown on.

8 and 9, the prosthesis design device can easily place a tooth in the scan data 90 if it knows the three-axis (Mesial, Buccal, Occlusal) information 800 of the tooth when the crown is placed in the prosthetic design stage. can do. For example, the scan data may be aligned in 3D x, y, and z axes, and the tooth arrangement axis in the scan data 90 may be calculated using the tooth number of the target value 900 to be designed. Subsequently, the tooth axis information 800 stored in advance as the tooth feature information is checked, and the tooth axis 800 is aligned with the calculated tooth arrangement axis. In this case, the axis 800 of the tooth whose axis information is known may be aligned to be the same as the tooth arrangement axis in the calculated scan data 90. Then, the center point of the axis of the tooth is aligned with the center of the margin line created in the first stage of the prosthesis design. The crown 910 may be disposed through the above-described process.

FIG. 10 is a diagram illustrating an example of adjusting a spacing between adjacent teeth and opposing teeth of a crown disposed in scan data using contact information of teeth according to an embodiment of the present invention.

After arranging the crown 910 in the scan data using axis information as described above with reference to FIG. 9, contact information of the teeth previously stored as shown in FIG. 10 for the placed crown 910 It is possible to adjust the spacing between the adjacent teeth and the opposing teeth of the crown 910 by using. For example, the user does not need to manually deform the shape of the crown 910 by finding the contact point, and two proximal contact points that are in contact with each adjacent tooth from the user, and each contact with the opposing tooth. Information on two facial cusp tip points and two lingual cusp tip points are received. At this time, the distance can be input as a numerical value and the corresponding point can be selected with a mouse or the like. Then, the prosthesis design apparatus checks the contact information of the known tooth by storing it in advance, and automatically adjusts the contact of the tooth according to the information input from the user. Accordingly, the shape of the crown 910 is automatically processed so that the distance between the adjacent teeth and the opposing teeth of the crown 910 can be adjusted. The left drawing of FIG. 10 is before contact adjustment of the crown 910, and the right drawing is a view in which the distance between adjacent teeth and opposing teeth of the crown 910 is automatically adjusted using contact information of teeth.

FIG. 11 is a diagram illustrating a combination of an outer surface and an outer surface of a crown using information on a tooth meridian line according to an exemplary embodiment of the present invention.

Referring to FIG. 11, the meridian line, which is a point separating the crown and the root of a tooth, can be used as a junction point when joining the inner surface and the outer surface of the crown. In FIG. 11 a), the boundary point of the inner surface of the crown corresponds to a margin line and may be referred to as a position to be bonded to the outer surface. In b) of FIG. 11, the tooth meridian stored as feature information may be used as the position to be joined on the outer surface of the crown. Data from the outer surface of the crown below the cervical meridian are deleted so that the outer boundary becomes the alveolar line, and the outer surface shape is transformed so that the outer boundary can reach the inner surface. And the deformed outer surface is combined with the inner surface, and Fig. 11 c) shows a state in which the inner surface and the outer surface of the crown are finally combined.

So far, the present invention has been looked at around the embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from a descriptive point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims (16)

Storing feature information on teeth in the template model in advance;
Obtaining scan data of the patient; And
Designing a prosthesis using tooth feature information previously stored on the acquired scan data;
Prosthesis design method comprising a. The method of claim 1, wherein the storing of feature information on the teeth in advance
A method for designing a prosthesis, comprising matching and storing feature information including tooth axis information, tooth opposing teeth and contact information with adjacent teeth, and tooth meridian information for each tooth. The method of claim 2,
The tooth axis information includes information on the occlusal surface axis, mesial surface axis, and buccal surface axis of the tooth,
The contact information of the tooth is the proximal contact point that contacts the adjacent teeth of the tooth, the facial cusp tip point that each contacts the opposing tooth, and the lingual cusp tip point. ) Prosthesis design method comprising a. The method of claim 1, wherein the step of designing the prosthesis
Arranging the crown in the scan data using the tooth axis information included in the tooth feature information;
Prosthesis design method comprising a. The method of claim 4, wherein the step of placing the crown
Aligning the scan data in three-dimensional x, y, and z axes;
Calculating a tooth arrangement axis in the scan data using the tooth number of the target tooth for which the crown is to be designed;
Checking the tooth axis information stored in advance as tooth feature information and aligning the tooth axis to the calculated tooth arrangement axis; And
Aligning the center point of the axis of the tooth with the center of the margin line;
Prosthesis design method comprising a. The method of claim 1, wherein the step of designing the prosthesis
Adjusting a spacing between adjacent teeth and opposing teeth of the crown disposed in the scan data by using the contact information of the teeth included in the tooth feature information;
Prosthesis design method comprising a. The method of claim 6, wherein adjusting the spacing between the adjacent teeth and the opposing teeth of the crown
Acquiring information on a point of contact with the adjacent teeth and the occlusal teeth; And
Checking the previously stored contact information of the tooth and automatically adjusting the contact of the tooth according to the obtained information, thereby adjusting the distance between the adjacent tooth and the opposing tooth of the crown;
Prosthesis design method comprising a. The method of claim 1, wherein the step of designing the prosthesis
Combining the inner and outer surfaces of the crown using the tooth meridian information included in the tooth feature information;
Prosthesis design method comprising a. The method of claim 8, wherein combining the inner and outer surfaces of the crown
Checking the alveolar line information previously stored as tooth feature information on the outer surface of the crown and deleting the data corresponding to the lower side of the alveolar line so that the boundary of the outer surface of the crown becomes the alveolar line;
Modifying the shape of the outer surface of the crown so that the boundary of the outer surface of the crown reaches the boundary of the inner surface of the crown; And
Combining the deformed outer surface of the crown with the inner surface of the crown;
Prosthesis design method comprising a. Generating a margin line as a junction portion between an outer surface and an inner surface of the crown;
Creating an inner surface of the crown;
Arranging the outer surface of the crown in the scan data using the tooth axis information included in the previously stored tooth feature information;
Deforming the shape of the crown by adjusting the spacing between the adjacent teeth and the opposing teeth using contact information of teeth included in the feature information of teeth stored in advance for the crown on which the outer surface is disposed; And
Combining the inner and outer surfaces of the crown using the tooth meridian information included in the previously stored tooth feature information;
Prosthesis design method comprising a. The method of claim 10, wherein the prosthesis design method
Creating a bridge connector connecting the successive crowns;
Prosthesis design method further comprising a. A data acquisition unit that acquires scan data of a patient;
A storage unit for pre-storing tooth feature information including axial information of teeth in the template model and contact information between opposing teeth and adjacent teeth; And
Select a tooth from the template model, place the selected tooth on the scan data using the tooth axis information, and adjust the distance between the adjacent teeth and the opposite teeth using the contact information of the placed teeth and the adjacent teeth. A control unit;
Prosthesis design device comprising a. The method of claim 12, wherein the control unit
Align the scan data on the 3D x, y, z axis,
The tooth placement axis in the scan data is calculated using the tooth number of the target tooth to be designed for the crown,
Check the tooth axis information stored in advance as the tooth feature information, and align the tooth axis to the calculated tooth placement axis,
Prosthesis design device, characterized in that matching the center of the axis of the tooth to the center of the margin line. The method of claim 12, wherein the control unit
Acquire information about the point of contact with the adjacent teeth and occlusal teeth,
A prosthesis design apparatus, characterized in that, as the contact information of the tooth stored in advance is checked and the contact of the tooth is automatically adjusted according to the obtained information, the distance between the adjacent tooth and the opposing tooth of the crown is adjusted. The method of claim 12,
The tooth characteristic information further includes information on the alveolar line of the tooth,
The control unit
Prosthesis design device, characterized in that combining the inner surface and the outer surface of the crown using the previously stored alveolar line information. The method of claim 15, wherein the control unit
Check the alveolar line information stored in advance as characteristic information of the tooth on the outer surface of the crown, and delete the data below the alveolar line so that the boundary of the outer surface of the crown becomes the alveolar line.
It transforms the shape of the outer surface of the crown so that the boundary of the outer surface of the crown can reach the boundary of the inner surface of the crown,
A prosthesis design device, characterized in that the deformed crown outer surface is coupled with the crown inner surface.

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