KR102506836B1 - Method for tooth arrangement design and apparatus thereof - Google Patents

Abstract

A tooth arrangement design method and apparatus are disclosed. A tooth arrangement design method and apparatus according to an embodiment can more accurately solve treatment problems of various patients by generating an arch line, which is a tooth arrangement standard for treatment, in consideration of both functional and aesthetic functions.

Description

Tooth arrangement design method and apparatus thereof {Method for tooth arrangement design and apparatus thereof}

The present invention relates to image analysis and processing technology, and more particularly, to digital dental diagnosis and treatment plan establishment technology through image analysis.

When establishing a dental treatment plan using digital dental treatment, it is possible to establish a more stable treatment plan by predicting and configuring the improved tooth arrangement from the current tooth condition. Since the tooth model in the digital environment can move freely in a 3-dimensional direction, various treatment plans can be established. At this time, if a virtual arch line is set as a standard in order to arrange teeth more neatly and regularly, away from free tooth model movement, and the tooth model is arranged according to the standard, better results can be derived.

In general, a virtual arch line allows a commercial wire for treatment to be presented and used so that it can be applied according to the surgeon's situational judgment. The surgeon proceeds with the treatment by selecting an arch line of appropriate size or shape for the patient's oral structure among various commercially available arch lines. Alternatively, even when a surgeon manually creates and applies an arch line according to the condition of an individual patient, the treatment is performed by generating an arch line dependent on the patient's oral structure.

In order to determine an appropriate treatment method, a setup operation is required to create virtual setup data so that teeth are arranged in an ideal form by establishing a diagnosis and treatment plan from clinical data in software before performing dental treatment. In order to create an arch line that is used as a standard when creating setup data, it is generally based on the experience and knowledge of the operator. Teeth arranged based on the arch line created based on the experience and knowledge of the surgeon are not suitable for accurately solving various patients' problems.

Korean Patent Publication No. 10-2019-0082452 (published on July 10, 2019)

In order to improve the problem of establishing a consistent treatment plan by applying the arch line used as a criterion for tooth arrangement to the existing general arch line or the arch line manually created by the user, customized treatment for the patient is realized and aesthetic and Tooth arrangement design method and device capable of reducing treatment plan establishment time and improving quality by automatically generating a patient-customized arch line based on criteria enabling improvement of functional problems and presenting the patient-customized arch line as a tooth arrangement criterion suggests

A tooth arrangement design method according to an embodiment includes a first judgment step of determining a problem of a patient by grouping clinical data of a patient for dental treatment into at least one of facial, skeletal, and oral information, and using the patient's clinical data as a function And a second judgment step of grouping into aesthetic information to determine the problem of the patient, a step of generating an arch line based on the first and second judgment results, and arranging teeth along the created arch line to output an output unit Including the step of displaying in

Facial information includes at least one of lip protrusion relationship and left-right symmetrical relationship information on the front of the face, and bone information includes maxillary and mandibular relationship, anterior-posterior position and left-right symmetrical relationship of the maxilla and mandible, maxillary anterior position, maxillary anterior inclination, and mandibular anterior position , includes at least one of mandibular anterior inclination and upper and lower anterior tooth angle information, and oral information includes midline relationship, anterior vertical cover, anterior horizontal cover, upper and lower anterior tooth angle, canine relationship, molar relationship, occlusal plane, tooth display ratio, It may include at least one of tooth shape, tooth size, tooth spacing, tooth rotation state, and tooth arrangement state information.

Functional information includes at least one of molar tooth relationship, canine tooth relationship, anterior tooth horizontal cover, anterior vertical tooth cover, occlusal plane, maxillary and mandibular anterior angle, maxillary and mandibular anterior position, maxillary and mandibular anterior inclination, maxillary and mandibular anterior tooth angle, and maxillary and mandibular bone relationship information And, the aesthetic information may include at least one of tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, tooth arrangement shape, lip protrusion relationship, mid-line relationship, and left and right symmetry relationship information on the front of the face.

The first judgment step is the step of classifying the patient's clinical data into facial, skeletal, and oral information, obtaining measured values for each item of the classified information, and comparing the measured values with reference values to determine the patient's problem. It may include the step of judging the matter.

The second determination step may include determining whether the patient needs a facial change, determining the position of the upper and lower jaws by reflecting the facial change or the skeletal structure of the upper and lower jaws, and determining the ratio of the upper and lower jaws to the front. there is.

The step of determining the position of the anterior teeth includes the step of prioritizing the position range of the position of the upper jaw that reflects the skeletal structure of the upper jaw as a priority; The method may include determining a position range of the maxillary anterior teeth reflecting the change, and determining a position of the anterior teeth of the maxilla by reflecting a relationship between the position range of the maxillary anterior teeth and an occlusal plane.

The step of determining the position of anterior displacement is the step of prioritizing the position range of the position of the lower jaw that reflects the skeletal structure of the lower jaw as a priority, and if a change in facial appearance is required, the facial position within the range of the position of the position of the lower jaw that reflects the skeletal structure of the lower jaw is determined first. The method may include determining a position range of the mandibular anterior teeth reflecting the change, and determining a position of the mandibular anterior teeth by reflecting a relationship between the mandibular anterior position range and the maxillary anterior teeth and an occlusal plane.

The step of determining the anterior ratio of the upper and lower jaws determines the position of the adjacent teeth based on the front display position of the maxillary anterior teeth so that the adjacent teeth have a value smaller than the predetermined display ratio or the display ratio of the anterior teeth, and determines the angle and skeletal range It may include determining the position of each upper jaw tooth in consideration of and determining the position of the upper jaw tooth and the position of the lower jaw tooth of the tooth number having the occlusion relation by analyzing the occlusion relationship between the upper and lower jaws.

The step of generating an arch line includes determining an arch line range by reflecting at least one of skeletal information and oral information, and occlusion conditions including the relationship between adjacent teeth and occlusal teeth based on the anterior position within the determined arch line range. A step of generating an arch line by reflection may be included.

In the step of creating the arch line, the maxillary arch line may be created to be larger than the mandibular arch line and directed toward the soft tissue, and the mandibular arch line may be created to be positioned lingually relative to the maxillary arch line.

The tooth arrangement design method may further include, when arranging the teeth along the arch line, securing a space necessary to enable the tooth arrangement within the limited range when the range of the planned tooth arrangement exceeds the limit range of the skeleton.

The tooth arrangement design method may further include a step of receiving a patient's opinion according to a patient's individual difference and reflecting it when creating an arch line.

The tooth arrangement design device according to another embodiment includes a data acquisition unit for obtaining clinical data of a patient, and grouping the patient's clinical data for dental treatment into at least one of facial, skeletal, and oral information to determine the patient's problem, After grouping the patient's clinical data into functional and esthetic information to determine the patient's problems, generating an arch line based on the judgment results, and arranging the teeth along the created arch line, and operation of the control unit It includes an output unit that displays a screen according to the execution.

According to the tooth arrangement design method and apparatus according to an embodiment, it is possible to establish a patient-specific dental treatment plan in which functional and aesthetic improvement effects can be expected together by reflecting changes in the patient's skeletal structure and facial appearance.

In particular, when the mouth is opened for aesthetic improvement, aesthetic improvement can be expected by arranging other teeth based on the position of the maxillary anterior teeth with the highest degree of external exposure, and accurate and establish a highly effective dental treatment plan.

1 is a view showing the configuration of a tooth arrangement design device according to an embodiment of the present invention;
2 is a view showing the flow of a tooth arrangement design method according to an embodiment of the present invention;
3 is a table summarizing the items required for each step of determining the patient's problem according to an embodiment of the present invention;
4 is a diagram showing a detailed process of determining a problem of a patient by additionally considering function and aesthetic information in oral, skeletal, and oral information according to an embodiment of the present invention;
5 is a diagram showing an example of operation for each step of the tooth arrangement design method according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction 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 the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like 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, the detailed description will be omitted, and the terms described later will be used in the embodiments of the present invention. These terms are defined by reflecting the functions of, and may vary depending on the user's or operator's intention or custom. Therefore, the definition should be made based on the contents throughout this specification.

Combinations of each block of the accompanying block diagram and each step of the flowchart may be executed by computer program instructions (execution engine), and these computer program instructions are executed by a processor of a general-purpose computer, special-purpose computer, or other programmable data processing device. Since it can be mounted, the instructions executed through the processor of a computer or other programmable data processing device create 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 functionality in a particular way, such that the computer usable or computer readable memory The instructions stored in are also capable of producing an article of manufacture containing instruction means for performing the functions described in each block of the block diagram or each step of the flow chart.

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

In addition, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical functions, and in some alternative embodiments may refer to 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 concurrently, or the blocks or steps may be performed in the reverse order of their corresponding functions, if necessary.

Hereinafter, 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 many different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

1 is a diagram showing the configuration of a tooth arrangement design device according to an embodiment of the present invention.

Referring to FIG. 1 , the tooth arrangement design apparatus 1 performs tooth arrangement design to help orthodontics, prosthesis, dentures, etc. in actual dentistry. The tooth arrangement design task is to obtain the patient's clinical data, diagnose and analyze the clinical data through software control, perform simulation, establish a treatment plan, and rearrange the teeth according to the established treatment plan. It refers to a series of processes that create setup data. The tooth arrangement can be applied to orthodontics, prosthetics, and dentures. The patient's clinical data may include at least one of CT data, oral data, and facial data, or data obtained by matching two or more.

The tooth array design device 1 according to an embodiment may include an electronic device capable of executing a tooth array design program and a server that communicates with the electronic device through a network. Electronic devices include computers, notebook computers, laptop computers, tablet PCs, smart phones, mobile phones, personal media players (PMPs), personal digital assistants (PDAs), and the like.

The tooth arrangement design device 1 according to an embodiment determines the anterior position of the upper jaw with the highest degree of external exposure when the patient opens his mouth, automatically creates an arch line based on the determined anterior position of the upper jaw, and then automatically creates an arch line. Aesthetic improvement can be expected by arranging other individual teeth on the arch line, and a dental treatment plan with high effectiveness can be established more accurately and conveniently by creating an arch line considering the tooth arrangement and occlusal relationship. Anterior teeth can refer to a total of six teeth on the left and right, three on each side of the midline. The anterior teeth may in particular be central incisors.

The tooth arrangement design apparatus 1 according to an embodiment automatically generates an arch line for functional and aesthetic improvement according to individual patient differences. Orthodontic purposes can be divided into improvement of functional problems to solve the occlusal relationship between the upper and lower teeth for smooth masticatory function or improvement of aesthetic problems for the neat arrangement of teeth when the mouth is open. Orthodontic treatment plans and objectives can be established to focus on functional and aesthetic problems according to individual patient differences.

The tooth arrangement design device 1 according to an embodiment seeks to improve the establishment of a consistent treatment plan by applying an existing general arch line or a line manually produced by a user to an arch line used as a reference when arranging teeth. To this end, a patient-customized arch line may be created in consideration of aesthetic information and functional information so as to realize patient-specific treatment and enable improvement of aesthetic and functional problems. In addition, the created arch line is presented as a criterion for tooth arrangement to shorten the treatment plan establishment time and improve quality.

Hereinafter, the configuration of the tooth arrangement design device 1 having the above-described characteristics will be described later with reference to FIG. 1 .

Referring to FIG. 1 , a tooth arrangement design apparatus 1 according to an 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 clinical data from the patient. Clinical data required for treatment may include at least one of CT data, oral data, and facial data, or data matching two or more. Furthermore, it may further include a cephalo-lateral photograph, panoramic data, cephalometric X-ray data, PA X-ray data, and the like.

The scan data is data having information on actual teeth including damaged teeth. The scan data may be tooth model scan data obtained by scanning a gypsum model created by imitating the patient's oral cavity with a 3D scanner. As another example, it may be intraoral scan data obtained by scanning the inside of the patient's oral cavity using a 3D intra-oral scanner. Acquired scan data may be stored in the storage unit 12 .

CT data may be obtained by generating tomographic images of the patient's head using computed tomography (CT), segmenting a boundary of a tooth in each tomographic image, and then combining them into one. These scan data and CT data are images obtained by photographing the upper jaw from below the upper teeth with the patient's mouth open, images obtained by photographing the lower teeth from above the lower teeth with the patient's mouth open, and images obtained by photographing the local area with the mouth closed. imaging, oral radiographs, etc. The obtained CT data may be stored in the storage unit 12 . CT data may be data in a three-dimensional form. Through CT data, soft tissue, which is external information on the face, skeletal structure, and oral information, which are internal information, can be obtained and used in dental treatment.

The controller 14 may prepare data before analyzing the patient's clinical data. Data preparation may include data matching, individual tooth separation, feature information extraction, and reference information extraction. Data matching is matching at least two data constituting clinical data. For example, in order to improve the accuracy of each information data, root information may be added to tooth information by matching 3D oral scan data and 2nd or 3D facial scan data to CT data. Alternatively, second circle facial scan data and 3D oral scan data may be matched. Through CT data or matching data matched with CT data, detailed facial information is reflected together, and predictable information is extended to the skeleton and face when teeth arrangement is changed in the oral cavity, so that more accurate and visual results can be confirmed when establishing a treatment plan. . In addition, examples of matched data may include head photograph and CT data, head radiograph data and CT data, and oral scan data and CT data, respectively.

According to an embodiment, the control unit 14 may group the patient's clinical data for dental treatment acquired through the data acquisition unit 10 into at least one of facial, skeletal, and oral information to determine the problem of the patient ( First Judgment). The face information may include at least one of a lip protrusion relationship and left-right symmetrical relationship information on the front of the face. The skeletal information may include at least one of maxillary and mandibular relationship, anteroposterior position and left-right symmetrical relationship of maxilla and mandible, maxillary anterior position, maxillary anterior inclination, mandibular anterior position, mandibular anterior inclination, and maxillary and mandibular anterior angle information. Oral information includes mid-line relationship, anterior vertical cover, anterior horizontal cover, upper and lower anterior tooth angle, canine tooth relationship, molar tooth relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, and tooth arrangement state information may include at least one of them.

In the first determination of the patient's problem, the control unit 14 according to an embodiment divides the patient's clinical data into facial information, skeletal information, and oral cavity information, and then obtains measurement values for each item of the classified information. . In addition, the problem of the patient may be first determined through comparison with the measured value and the reference value.

The controller 14 according to an embodiment may group the patient's clinical data into functional and aesthetic information to determine the patient's problem (second determination). Functional information is a major item related to occlusion function. For example, functional information includes molar occlusion relationship, canine occlusion relationship, anterior horizontal cover, anterior vertical cover, occlusal plane, maxillary and mandibular anterior angle, maxillary and mandibular anterior position, maxillary and mandibular anterior inclination, maxillary and mandibular anterior angle, maxilla and mandibular relationship At least one of the information may be included. Esthetic information is an item that has little or no relation to occlusion function and is reviewed cosmetically. For example, the aesthetic information may include at least one of tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, tooth arrangement shape, lip protrusion relationship, midline relationship, and facial front left/right symmetry relationship information. .

Here, the first determination and the second determination may be performed simultaneously in terms of time, and the first determination step may be performed before the second determination step, or the second determination step may be performed before the first determination step.

In the second determination of the patient's problem, the controller 14 according to an embodiment determines whether the patient's face needs to be changed, determines the position of the upper and lower jaws by reflecting the facial change or the skeletal structure of the upper and lower jaws, and then determines the position of the upper and lower jaws. The ratio of transposition of evil can be determined. In this case, whether or not a facial change is necessary may include, illustratively, whether to correct the degree of protrusion of the lips.

Determination of anterior displacement position For example, the control unit 14 may prioritize determining a range of anterior displacement of the upper jaw reflecting the skeletal structure of the upper jaw. At this time, if a facial change is required, a position range of anterior position of the upper jaw reflecting a change in facial appearance may be determined within a position range of anterior position of the upper jaw reflecting a determined skeletal structure of the upper jaw. Finally, the position of the anterior position of the maxilla can be determined by reflecting the relationship between the position range of the anterior position of the maxilla and the occlusal plane.

As another example, the control unit 14 may prioritize determining the position range of the anterior teeth of the mandible reflecting the skeletal structure of the mandible. At this time, if a facial change is required, a position range of the lower jaw displacement reflecting the facial change may be determined within a position range of the lower jaw displacement reflecting the determined skeletal structure of the lower jaw. Finally, the position of the mandibular anterior teeth can be determined by reflecting the position range of the mandibular anterior teeth, the relationship with the maxillary incisors, and the relationship with the occlusal plane.

Determination of the upper and lower anterior teeth ratio For example, the control unit 14 determines the position of the adjacent teeth based on the front display position of the upper jaw teeth so that the adjacent teeth can have a value smaller than the predetermined display ratio or the display ratio of the anterior teeth, The position of each maxillary tooth can be determined considering the angle and skeletal range. Finally, by analyzing the occlusal relationship of the lower jaw, it is possible to determine the position of the upper jaw tooth and the lower jaw tooth of the tooth number having the occlusal relationship.

The controller 14 generates an arch line based on the first and second judgment results, and arranges teeth along the created arch line.

Creation of an arch line For example, the controller 14 may determine an arch line range by reflecting at least one of skeletal information and oral cavity information. In addition, an arch line may be created by reflecting occlusal conditions including the relationship between adjacent teeth and occlusal teeth based on the position of the anterior teeth within the determined range of the arch line.

When creating the arch line, the control unit 14 may create the upper arch line to be larger than the lower arch line and to be in a position toward the soft tissue, and create the lower jaw arch line to be in a position toward the lingual side compared to the upper jaw line. .

The control unit 14 according to an exemplary embodiment reviews restrictions when arranging teeth and secures a necessary space. For example, when the range of tooth arrangement planned during tooth arrangement exceeds the limit of the skeleton, the teeth may be arranged along the arch line after securing a necessary space so that the teeth may be arranged within the limit.

The control unit 24 according to an embodiment may receive a patient's opinion according to a patient's individual difference through the input unit 16 and reflect it when creating an arch line. Patient comments may include required and additional improvements.

The storage unit 12 stores various data such as information necessary for the operation of the tooth arrangement design device 1 and information generated according to the operation. The storage unit 12 may provide the controller 14 with data necessary for data analysis by the controller 14 .

The output unit 18 displays a screen according to the operation of the control unit. For example, the position of anterior maxilla, anterior mandible, arch line, tooth arrangement, etc. may be displayed in clinical data.

The input unit 16 receives a user manipulation signal. For example, an operation signal for user modification, such as movement or rotation of tooth arrangement data displayed on a screen, is received through the output unit 18 . The input unit 16 may receive setting values for face information, skeletal information, oral information, etc. extracted from the patient's clinical data from the user. For example, the position of the facial lips according to the position of the upper jaw may be set at various ratios designated by the operator. The input unit 16 may receive input of patient opinions according to individual patient differences.

2 is a diagram showing the flow of a tooth arrangement design method according to an embodiment of the present invention.

Referring to FIGS. 1 and 2 , the tooth arrangement design device 1 groups the patient's clinical data into facial, skeletal, and oral information to determine the patient's problem (S210; first judgment). Measurement information necessary for the first determination of the problem of the patient includes face information, skeletal information, oral information, and the like.

The face information includes lip protruding relationship (whether upper lip or lower lip protrudes) and left-right symmetrical relationship information on the front of the face. Skeletal information includes maxillary and mandibular relationship (anterior-posterior position of maxilla and mandible and left-right symmetrical relationship), maxillary anterior position, maxillary anterior inclination, mandibular anterior position, mandibular anterior inclination, and maxillary and mandibular anterior angle information. Oral information includes mid-line relationship, anterior overjet, anterior vertical overbite, maxillary and mandibular anterior tooth angle, canine tooth relationship, molar relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation It includes status, tooth arrangement type information, and the like.

For example, in the first determination step ( S210 ), the tooth arrangement design device 1 classifies the patient's clinical data into face, skeletal, and oral information, and then obtains a measurement value for each item of the divided information. Then, as the difference between the measured value and the reference value is reviewed through comparison with the measured value and the reference value, it is possible to determine the problem of the patient. At this time, problems according to the patient's opinion can be reviewed together.

Subsequently, the tooth arrangement design device 1 groups the patient's clinical data into functional information and aesthetic information to determine the patient's problem (S220; second judgment). The second judgment step (S220) of problem items is a step for reviewing and improving problem items by rearranging the problem items derived in the first judgment step (S210) from functional and aesthetic viewpoints.

Functional information includes posterior occlusion, canine occlusion, anterior occlusion, anterior horizontal cover, anterior vertical cover, occlusal plane (speaker curve, Wilson curve), upper and lower anterior teeth angle, upper and lower anterior position, upper and lower anterior inclination, upper and lower jaw It is an item that is highly related to occlusal function, such as the anterior teeth angle and maxillary and mandibular relationship information. Aesthetic information has little to do with occlusal function, such as tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation, tooth arrangement (arch line), lip protrusion relationship, mid-line relationship, facial frontal symmetry relationship information, etc. There is no, and it is an item to be reviewed cosmetically.

In order to improve the establishment of a consistent treatment plan by applying the existing general arch line or a line manually created by the user to the arch line used as a standard when arranging teeth, it is possible to realize customized treatment for the patient and to improve functional and aesthetic problems. Functional information and aesthetic information can be used to make it possible.

A patient-customized arch line can be automatically created by additionally reflecting functional information and aesthetic information in facial, skeletal, and oral cavity information, and the created patient-customized arch line can be presented as a standard for tooth arrangement.

Specifically, the tooth arrangement design apparatus 1 generates an arch line based on the first and second judgment results (S230). In the arch line generation step (S230), a range of available arch lines is extracted based on skeletal information and oral information, and an arch line reflecting the occlusion condition (adjacent teeth, occlusion teeth relationship) is created. For example, based on the predetermined upper and lower anterior teeth, a flat arch line with a structure that allows adjacent teeth to adhere closely and maintain an occlusion relationship is created. By calculating the range in which the tooth roots can be located in the upper and lower jaw skeleton and considering the angle information that the crown of the tooth has with the occlusal surface, the tooth arrangement of the structure that can occlude is made so that all the teeth of the upper jaw cover all the teeth of the lower jaw. Create possible arch lines. That is, the maxillary tooth alignment arch line should be larger than the mandibular tooth alignment arch line and should be positioned toward the soft tissue, and the mandibular tooth alignment arch line should be positioned toward the lingual side.

Subsequently, the teeth are arranged along the created arch line and displayed on the output unit (S250). For example, individual teeth are moved to a tooth arrangement consistent with the determined upper and lower arch lines.

Prior to the tooth arrangement and display step (S250), a step (S240) of securing a space through the tooth arrangement restriction determination may be further performed. In the space securing step (S240), when arranging teeth according to the arch line, when the range of the planned tooth arrangement exceeds the limited range of the skeleton, it is possible to secure the necessary space so that the teeth can be arranged within the limited range. For example, considering additional matters such as interdental preparation, maxillary arch extension, tooth extraction, etc., necessary space is secured to enable planned tooth arrangement. Subsequently, the teeth may be arranged according to the arch line within the secured space and displayed on the output unit (S250).

Furthermore, the tooth arrangement design device 1 may further perform a treatment plan establishment step, a treatment execution step, a treatment result providing step, and a prognosis check step.

In the treatment plan establishment step, the user and the patient can review the occlusal relationship by finally reflecting the opinion of the user or patient while checking the tooth arrangement that has improved the problem, and can change the tooth arrangement by correcting the arch line if necessary. The predicted tooth arrangement state and planned matters must be proceeded with the consent of the patient after sufficient explanation by the user, and the final goal of tooth arrangement is determined. Save all tooth positions in the final alignment and finalize the treatment plan.

In the treatment implementation stage, orthodontic treatment is performed according to the treatment plan. Subsequently, in the step of providing the results and confirming the prognosis, the treatment correction procedure or process is terminated by confirming the planned tooth arrangement during or after the treatment is completed.

3 is a table summarizing items required for each stage of problem determination of a patient according to an embodiment of the present invention.

Referring to FIGS. 1 and 3 , in the patient's opinion convergence step, the tooth arrangement design device 1 identifies items that the patient wants to improve as essential or additional.

Then, after grouping the clinical data into facial, skeletal, and oral information, the problem of the patient is determined (first judgment), and after grouping into functional and aesthetic information, the problem of the patient is determined (second judgment). For example, items classified as face information, skeleton, and oral cavity information for the first judgment may be classified differently into function and aesthetic information for the second judgment. The first judgment is to judge the problem centering on facial, skeletal and oral standards, and the second judgment is to judge the problem centering on functional and aesthetic standards. The first judgment and the second judgment may be performed in separate steps, or simultaneously, or combined in one step, so that problems may be comprehensively determined.

The lip protrusion-related item is classified as facial information in the first determination of the problem, and classified as aesthetic information in the second determination. In the process of determining the problem centering on the lip protrusion relation item, whether the upper and lower lips protrude by checking the difference between the E-Line connecting the tip of the nose and the tip of the chin or a specific position additionally designated by the user and the position of the uppermost and lower lips. decide Differences can be confirmed by selecting various criteria according to race, gender, and age, and improvement can be expected by changing other problems, especially the location of the anterior teeth.

The left-right symmetry of the facial front is classified as facial information in the first determination of the problem, and classified as aesthetic information in the second determination. In the process of determining problems centered on the left-right symmetry of the front of the face, the symmetrical relationship is confirmed by examining the left-right symmetry ratio and slope with a specific position specified by the user or based on the line connecting the center of the pupil and the tip of the nose. . Make sure to maintain a certain angle and size according to the left and right ratio standards.

The maxillary/mandibular relationship is classified as skeletal information in the first determination of the problem, and classified as functional information in the second determination. In the problem determination process using the maxilla/mandible relationship, whether the maxilla and mandible protrudes is determined by combining the front and rear positions and angles of the line connecting the feature points of the side skeleton. Since the change of the skeletal position adjusted by improving the position and arrangement of teeth without jaw surgery is limited, adjustment of the range of movement is included. Since the positions of the upper and lower jaw bones are closely related to measurement items on the face, it is possible to maintain standards when identifying problems and establishing treatment plans.

The mid-line relationship is classified as oral information in the first determination of the problem, and classified as aesthetic information in the second determination. In the problem determination step using the midline relationship, the upper and lower jaw anterior positions are determined based on the facial midline. However, except for cases where the position of the upper and lower anterior teeth cannot be aligned with the midline due to problems with the number of teeth or additional diagnostic matters, the midline of the face and the position of the upper and lower anterior teeth are matched. If both the upper and lower midlines cannot be matched according to the individual patient's circumstances, the result of weighting the position of the upper and lower jaws is presented, and finally, the midline relationship that reflects the user's opinion is applied.

The maxillary anterior position is classified as skeletal information in the first determination of the problem, and classified as functional information in the second determination. In the problem determination step using the maxillary anterior position, the maxillary anterior position range according to facial changes can be determined, and additional information for improving the skeletal and oral problems can be added to finally determine the maxillary anterior position. After the range of the anterior position according to the facial change is determined or when the facial change is not required, the position of the maxillary anterior can be determined by applying the information of the patient's skeletal structure and oral conditions.

If a facial change is required, the range of the anterior position of the upper jaw according to the facial change is calculated and the following steps are applied sequentially. Although the crown portion of the tooth protrudes out of the gum, the tooth root can perform the function of the tooth only when it is located within the skeletal region inside the gum that the gum surrounds. Since tooth movement must be performed only within the range where the skeleton can stably position the tooth root, the movement range of the upper anterior teeth must be adjusted. Therefore, the maxillary anterior position range reflecting the patient's skeletal structure is adjusted. The maxillary anterior position range takes precedence over the limiting range of the skeleton, and the position range according to facial changes must be applied so that it is included within the limiting conditions of the skeleton. After the position range of the anterior teeth of the upper jaw is determined, it may be necessary to reflect angle information of the teeth. This allows the factor that determines the angle between the occlusal plane and the crown or the angle that reflects the value diagnosed by the operator or the maximum approximation that can be reflected within the movement range to determine the final position of the anterior teeth of the maxilla.

The position of the mandibular anterior teeth is classified as skeletal information in the first determination of the problem, and classified as functional information in the second determination. In the problem determination step using the lower jaw anterior position, when determining the need for facial change, determine the range of lower jaw anterior position according to the facial change, and additionally provide information for improving skeletal and oral problems and determined maxillary anterior position It is possible to determine the position of the anterior teeth of the lower jaw by adding occlusal relation information in a fixed state. After determining the position of the anterior teeth of the upper jaw, the position range of the lower jaw anterior teeth is determined by reflecting the position range of the lower jaw anterior teeth according to facial changes and the position range of the mandibular anterior teeth of the mandibular skeleton like the upper jaw anterior teeth. After the position range of the mandibular anterior teeth is confirmed, the following conditions are applied to finally determine the position of the mandibular anterior teeth. For example, the angle information of the long axes of the upper and lower anterior teeth, the horizontal cover of the anterior/posterior position, and the vertical cover of the upper/lower position are combined to set a preset value that each item can have. The final anterior position of the lower jaw may be determined so as to have a value or a value that reflects the value diagnosed by the operator or a maximum approximation value.

Occlusal conditions, including molar relationships, canine relationships, and occlusal planes, are classified as oral relationships in the first judgment of the problem, and classified as oral relationships in the second judgment. In particular, the occlusion condition may be used when arranging teeth of the upper and lower jaws. For example, the occlusion conditions necessary for arranging the upper and lower teeth are as follows.

Adjacent teeth must be closely spaced. The maxillary canines are located between the mandibular canines and the first premolars. The mesio lingual cusp of the maxillary first molar coincides with the central fossa of the mandibular first molar. All the buccal cusps of the maxillary teeth are located more buccal than all the buccal cusps of the mandibular teeth. All buccal cusps of the mandibular teeth are located more lingual than all the buccal cusps of the maxillary teeth.

The created upper and lower arch lines can be modified to enable the tooth arrangement that should include the above items by default, and the arch line for tooth arrangement that can reflect additional information according to the diagnosis result of the surgeon can be modified. The finally determined arch line can be applied when arranging teeth or for the purpose of confirming the result of arranging teeth.

4 is a diagram showing a detailed process of determining a problem of a patient by additionally considering function and aesthetic information in addition to oral cavity, skeleton, and oral cavity information according to an embodiment of the present invention.

Referring to FIGS. 1 and 4 , the tooth arrangement design device 1 determines whether a facial change is necessary (S410). In this case, it is possible to determine whether or not a facial change is required through problem diagnosis, or whether or not a facial change is required according to a patient's request.

Since the location of the upper and lower anterior teeth is a factor that directly or indirectly has a great influence on facial changes, especially the position of the lips, the location range information where the upper and lower anterior teeth should be located is determined according to whether or not a facial change is necessary. After it is determined that a change is necessary in the step of determining whether or not a facial change is necessary, the following procedure may be followed in detail. Since the lip part of the face has a structure in which the soft tissue protrudes or sinks depending on the position of the anterior teeth in the oral cavity, in order for the upper lip to move forward, the maxillary incisor must move forward, and to move the upper lip to the rear, the maxillary incisor must move backward. Tooth alignment is essential. The lower lip should also be accompanied by the position of the lower anterior teeth according to the position of the lower lip on the same principle. The effect of the movement of the anterior teeth in the oral cavity on the facial lips can be analyzed by various factors such as the thickness, structure, and location of the soft tissue of the lips of the patient. important factor that must be At this time, the position of the facial lips according to the position of the upper jaw anterior teeth may be applied at a predetermined ratio or at various ratios designated by the operator, and whatever ratio is applied, the relationship between the position change of the lips and the position of the anterior teeth may be reflected. Alternatively, if the lips do not need to be changed, the position of the upper and lower anterior teeth must be fixed in order to arrange the teeth without changing the face.

Additionally, among the location information of the upper lip, the angle between the nose and upper lip, that is, the change in the nasal angle, is an additional item that affects the position of the upper jaw unlike the change in the lower lip. Along with the position of the maxillary incisors, the angle at which the maxillary incisors protrude or sink forward acts as a factor in determining the size of the nasolabial fold, and the ratio applied to this can also be a pre-applied value or a ratio specified by the user through analysis. . To reduce the nasolabial fold angle, an angle protruding forward along with the position of the maxillary anterior teeth should be obtained, and to increase the nasal labrum angle, an angle should be indented posteriorly together with the position of the maxillary anterior teeth. Based on the above, when determining whether or not a facial change is necessary, the upper and lower tooth position ranges can be calculated as essential or additionally.

Subsequently, the tooth arrangement design device 1 determines the position of the anterior upper jaw (S420). For example, a range according to whether or not a facial change is necessary is given a medium priority, and an upper jaw movement range is calculated with a high priority over a tooth movement range according to the structure of the maxilla. The position and angle of the left and right maxillary anterior teeth should be comprehensively reviewed. Finally, the position of the maxillary anterior teeth can be determined by considering the relationship with the occlusal surface and the position of the mandibular anterior teeth.

Subsequently, the tooth arrangement design device 1 determines the position of the lower anterior teeth (S430). For example, a range according to whether or not a facial change is necessary is set as a medium priority, a tooth movement range according to a mandible structure is set as a high priority, and then a lower anterior movement range is calculated. At this time, the positions and angles of the left and right mandibular anterior teeth can be comprehensively reviewed. Finally, the position of the mandibular anterior teeth can be determined by considering the relationship of the maxillary anterior teeth and the relationship with the occlusal surface.

Subsequently, the tooth arrangement design device 1 determines the ratio of upper and lower anterior teeth (S440). For example, based on the front display position of the maxillary anterior teeth, the position of the adjacent teeth is determined so that the adjacent teeth may have a predetermined display ratio or a value smaller than the display ratio of the anterior teeth. At this time, the position of each upper jaw tooth can be determined after considering the angle and the skeletal range, and finally analyzing the occlusion relationship between the upper and lower jaws to determine the position of the upper tooth of the tooth number having the occlusion relationship.

5 is a diagram showing an example of work for each step of the tooth arrangement design method according to an embodiment of the present invention.

Referring to FIGS. 1 and 5, the tooth arrangement design device 1 groups the patient's clinical data into facial, skeletal, and oral information, grouped into functional and aesthetic information, and then grouped the items grouped into each group. Analyze and determine the patient's problem (a). In (a) of FIG. 5, an example of analyzing the items of the upper lip 510 is shown.

Subsequently, the tooth arrangement design device 1 determines the position of the anterior teeth 500 for treatment in consideration of the determined patient's problems (b). 5(b) shows the position of the central incisor determined from the lateral registration data.

Subsequently, the tooth arrangement design device 1 determines anterior ratio of the upper and lower jaws (c). At this time, based on the front display position of the maxillary anterior teeth, the position of the adjacent teeth is determined so that the adjacent teeth can have a specified display ratio or a value smaller than the display ratio of the anterior teeth, and the position of each maxillary tooth in consideration of the angle and skeletal range can decide In addition, by analyzing the occlusion relationship between the upper and lower jaws, it is possible to determine the position of the upper and lower teeth of the tooth number having the occlusion relationship.

Subsequently, an arch line 550 is created based on the determined position of the anterior tooth 500, and other individual teeth are moved along the created arch line 550 to arrange the teeth and display them on the output unit (d). At this time, the arch line 550 may be created so that the upper arch line is larger than the lower arch line and is in a position toward the soft tissue, and the lower arch line is in a position toward the lingual side compared to the upper arch line. When arranging teeth according to the arch line, if the range of the planned tooth arrangement exceeds the limit of the skeleton, the teeth can be arranged after securing the necessary space so that the teeth can be arranged within the limited range.

Reference numeral 530 shows original teeth of the patient before correction, and a region indicated by a dotted line at reference numeral 540 means teeth arranged by moving the teeth. When other individual teeth are arranged along the generated arch line 550 and displayed on the output unit, the transparency of the original tooth 530 and the newly arranged tooth 540 are displayed differently, or the original tooth 530 is displayed as a solid line. , the newly arranged teeth 540 may be displayed in a different format, such as a dotted line.

So far, the present invention has been looked at mainly by its embodiments. Those skilled 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 reflected from a descriptive point of view, not a limiting point of view. The scope of the present invention is shown 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 (13)

In the tooth array design method performed by a computer,
A first judgment step of determining a problem for establishing a patient's dental plan by grouping the patient's clinical data for dental treatment into at least one of facial, skeletal, and oral information;
A second judgment step of regrouping the same clinical data of the patient into functional and esthetic information to determine problems for the patient's dental plan establishment;
generating an arch line based on the first and second determination results; and
arranging teeth along the created arch line and displaying them on an output unit; Including,
For the same clinical data, the problem is comprehensively judged by making a judgment based on the facial, skeletal, and oral standards in the first judgment step, and re-judging on the functional and aesthetic standards in the second judgment step,
A method of designing a tooth arrangement, characterized in that a problem determined as facial, skeletal, or oral information in the first judgment step is judged as function or aesthetic information in the second judgment step. According to claim 1,
The face information includes at least one of lip protrusion relationship and facial front left-right symmetry relationship information;
The skeletal information includes at least one of maxillary and mandibular relationship, anteroposterior position and left-right symmetrical relationship of maxilla and mandible, maxillary anterior position, maxillary anterior inclination, mandibular anterior position, mandibular anterior inclination, and upper and lower anterior angle information,
Oral information includes mid-line relationship, anterior vertical cover, anterior horizontal cover, upper and lower anterior tooth angle, canine tooth relationship, molar tooth relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, and tooth arrangement state information Tooth array design method, characterized in that it comprises at least one of. According to claim 1,
Functional information includes at least one of molar tooth relationship, canine tooth relationship, anterior tooth horizontal cover, anterior vertical tooth cover, occlusal plane, maxillary and mandibular anterior angle, maxillary and mandibular anterior position, maxillary and mandibular anterior inclination, maxillary and mandibular anterior tooth angle, and maxillary and mandibular bone relationship information do,
The aesthetic information includes at least one of tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, tooth arrangement shape, lip protrusion relationship, mid-line relationship, facial front left and right symmetrical relationship information. design method. The method of claim 1, wherein the first judgment step
Classifying the patient's clinical data into facial, skeletal, and oral information;
obtaining a measurement value for each item of classified information; and
Determining the problem of the patient through comparison with the measured value and the reference value;
Tooth array design method comprising a. The method of claim 1, wherein the second judgment step
Determining whether the patient's facial appearance needs to be changed;
determining the position of the upper and lower jaws by reflecting facial changes or skeletal structures of the upper and lower jaws; and
determining anterior ratio of the upper and lower jaws;
Tooth array design method comprising a. 6. The method of claim 5, wherein determining the displacement position comprises:
Prioritizing the position range of the maxillary anterior teeth reflecting the skeletal structure of the maxilla;
determining a range of anterior position of the upper jaw that reflects the change in facial appearance within a position range of anterior position of the upper jaw that reflects the determined skeletal structure of the upper jaw, if a change in facial appearance is required; and
determining an anterior position of the maxilla by reflecting a relationship between an anterior position range of the maxilla and an occlusal plane;
Tooth array design method comprising a. 6. The method of claim 5, wherein determining the displacement position comprises:
Prioritizing the position range of the mandibular anterior teeth reflecting the skeletal structure of the mandible;
determining a position range of the mandibular anterior position reflecting the facial change within a position range of the mandibular anterior position reflecting the determined mandibular skeletal structure, if a facial change is required; and
determining the position of the anterior position of the lower jaw by reflecting the relation between the position range of the lower jaw anterior teeth, the relationship between the upper jaw and the occlusal plane;
Tooth array design method comprising a. The method of claim 5, wherein the step of determining the transposition ratio of the maxilla and mandible
Based on the frontal display position of the maxillary anterior teeth, determine the position of adjacent teeth so that the adjacent teeth can have a specified display ratio or a value smaller than the display ratio of the anterior teeth, and determine the position of each maxillary tooth in consideration of the angle and skeletal range doing; and
Analyzing the occlusion relationship between the upper and lower jaws to determine the position of the upper and lower teeth of the tooth numbers having the occlusion relationship;
Tooth array design method comprising a. The method of claim 1, wherein the step of creating an arch line
determining an arch line range by reflecting at least one of skeletal information and oral cavity information; and
generating an arch line by reflecting occlusal conditions including relationships between adjacent teeth and occlusion teeth based on the position of the anterior teeth within the determined arch line range;
Tooth array design method comprising a. The method of claim 1, wherein the step of creating an arch line
The maxillary arch line is larger than the mandibular arch line and is created to be in a position toward the soft tissue, and the mandibular arch line is created to be in a lingual position relative to the maxillary arch line. The method of claim 1, wherein the tooth arrangement design method
When arranging teeth according to the arch line, when the range of the planned tooth arrangement exceeds the limited range of the skeleton, securing a space necessary to enable the tooth arrangement within the limited range;
Tooth array design method characterized in that it further comprises. The method of claim 1, wherein the tooth arrangement design method
Step of receiving the patient's opinion according to the difference of the individual patient and reflecting it when creating an arch line;
Tooth array design method characterized in that it further comprises. a data acquisition unit acquiring clinical data of the patient;
The patient's clinical data for dental treatment is grouped into at least one of facial, skeletal and oral information to first determine the problem for the patient's dental plan establishment, and the patient's same clinical data is regrouped into functional and aesthetic information After a second determination of problems for establishing a dental plan, a control unit for generating an arch line based on the determination results, and arranging teeth along the created arch line; and
an output unit displaying a screen according to the operation of the control unit; Including,
The control unit
Based on the same clinical data, the first judgment is based on the facial, skeletal, and oral standards, and the second judgment is based on functional and aesthetic standards, so the problem is comprehensively judged.
A tooth arrangement design device characterized in that a problem determined as facial, skeletal, or oral information in the first judgment is judged as functional or aesthetic information in the second judgment.

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