KR20220067095A - Method for tooth arrangement design and apparatus thereof - Google Patents

Abstract

A tooth arrangement design method and an apparatus thereof are disclosed. A tooth arrangement design method and an apparatus thereof 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

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 dental model in the digital environment can move freely in the three-dimensional direction, it is possible to establish various treatment plans. At this time, better results can be obtained if a virtual arch line is set as a standard to align teeth more evenly and regularly, away from free movement of the tooth model, and if the tooth model is arranged according to the standard.

In general, the virtual archline provides and uses commercial wires for treatment so that they can be applied according to the operator's situational judgment. The surgeon selects an arch line that is appropriate in size or shape for the patient's oral structure from among various commercially available arch lines and proceeds with treatment. Alternatively, even when the surgeon manually creates and applies an arch line according to the patient's individual condition, the treatment proceeds by creating an arch line that also depends on the patient's oral structure.

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

In order to improve the problem of establishing a consistent treatment plan by applying the arch line used as a standard for tooth alignment as an existing general arch line or an arch line created by the user, we realize customized treatment for patients and A tooth arrangement design method and device that can reduce treatment planning time and improve quality by automatically creating a patient-customized arch line based on criteria that enables functional problem improvement and presenting the patient-customized arch line as a tooth arrangement standard suggest

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

The facial information includes at least one of lip protrusion relationship and facial frontal left-right symmetry relationship information, and the skeletal information includes maxilla and mandible relationship, anterior-posterior position and left-right symmetry relationship between maxilla and mandible, maxillary incisor position, maxillary incisor tilt, and mandibular incisor position. , mandibular incisor slope, and maxillary and mandibular incisor angle information, and oral information includes midline relationship, anterior vertical overlay, anterior horizontal overlay, maxillary and mandibular incisor 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 relationship, canine relationship, anterior horizontal overlay, anterior vertical overlay, occlusal plane, upper and lower incisor angle, upper and lower incisor position, upper and lower incisor tilt, upper and lower incisor angle, maxilla and mandible relationship information And, the aesthetic information may include at least one of a tooth display ratio, a tooth shape, a tooth size, a tooth spacing, a tooth rotation state, a tooth arrangement shape, a lip protrusion relationship, a midline relationship, and a frontal left-right symmetry relationship information of the face.

The first determination step is a step of classifying the patient's clinical data into facial, skeletal and oral information, obtaining a measurement value for each item of the divided information, and comparing the measurement value and the reference value to the patient's problem It may include the step of determining the matter.

The second determination step may include determining whether the patient needs a facial change, determining the upper and lower incisor positions by reflecting the facial changes or the skeletal structure of the upper and lower jaws, and determining the upper and lower incisor ratios. have.

The step of determining the anterior position includes the steps of prioritizing the anterior position range of the maxilla reflecting the skeletal structure of the maxilla. It may include determining the anterior position range of the maxilla reflecting the change, and determining the anterior position of the maxilla by reflecting the relationship between the anterior position range of the maxilla and the occlusal plane.

In the step of determining the anterior position, the anterior position range of the mandible reflecting the skeletal structure of the mandible is determined as a priority. It may include the steps of determining the anterior position range of the mandible reflecting the change, and determining the anterior position of the mandible by reflecting the relationship between the anterior position range of the mandible and the maxillary incisors and the occlusal plane.

The step of determining the incisor ratio of the upper and lower jaws includes determining the position of the adjacent teeth so that the adjacent teeth have a value smaller than the predetermined display ratio or the display ratio of the incisors based on the front display position of the maxillary incisors, and the angle and skeletal range It may include the steps of determining the position of each maxillary tooth in consideration of, and analyzing the occlusal relationship between the upper and lower jaws to determine the position of the maxilla and the position of the mandible of the tooth number having the occlusal relationship.

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

In the step of generating the arch line, the upper arch line may be generated to be larger than the lower arch line and to be positioned toward the soft tissue, and the lower arch line may be generated to be positioned toward the lingual side compared to the upper arch line.

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

The tooth arrangement design method may further include a step of receiving an input of a patient's opinion according to individual differences and reflecting the input when generating an arch line.

A tooth arrangement design apparatus according to another embodiment includes a data acquisition unit for acquiring clinical data of a patient, and grouping clinical data of a patient for dental treatment into at least one of facial, skeletal and oral information to determine the patient's problem and , After determining the patient's problem by grouping the patient's clinical data into functional and esthetic information, generating an arch line based on the determination results, and arranging the teeth along the generated arch line; Operation of the control unit It includes an output unit for displaying a screen according to the execution.

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

In particular, when the mouth is opened for an aesthetic improvement effect, aesthetic improvement can be expected by arranging other teeth based on the maxillary anterior position, which has the highest external exposure. and can establish a dental treatment plan that is highly effective.

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 items required for each step of determining a patient's problem according to an embodiment of the present invention;
4 is a view showing a detailed process of determining a patient's problem by additionally considering functional and aesthetic information to oral, skeletal and oral information according to an embodiment of the present invention;
5 is a view 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 a method for achieving them will become apparent 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 these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

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

Each block in the accompanying block diagram and combinations of steps in the flowchart may be executed by computer program instructions (execution engine), which are executed by the processor of a general-purpose computer, special-purpose computer, or other programmable data processing device. It may be mounted so that its instructions, which are executed by 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 in each step of the flowchart.

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

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

In addition, each block or step may represent a module, segment, or portion of code comprising one or more executable instructions for executing specified logical functions, and in some alternative embodiments the blocks or steps referred to in some alternative embodiments. It should be noted that it is also possible for functions to occur out of sequence. For example, it is possible that two blocks or steps shown one after another may be performed substantially simultaneously, and also the blocks or steps may be performed in the reverse order of the 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 illustrated below may be modified in various other 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 of ordinary skill in the art to which the present invention pertains.

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

Referring to FIG. 1 , a tooth arrangement design device 1 performs a tooth arrangement design to help with orthodontics, prostheses, dentures, and the like in actual dentistry. The tooth arrangement design task is a virtual tooth in which the patient's clinical data is acquired, the treatment plan is established by performing a simulation through diagnosis and analysis using the clinical data through software control, and the teeth are rearranged according to the established treatment plan. It refers to a series of processes for creating setup data. Tooth alignment 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 alignment design apparatus 1 according to an embodiment may include an electronic device capable of executing a tooth alignment 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 maxilla with the highest degree of external exposure when the patient opens his/her mouth, and automatically creates an arch line based on the determined anterior position of the maxilla. By arranging other individual teeth on the arch line, aesthetic improvement can be expected, and by creating an arch line that considers the occlusal relationship as well as the tooth arrangement, a more accurate and convenient dental treatment plan can be established. Anterior teeth can be defined as three teeth on each side of the midline, and a total of six teeth on the left and right. Anterior teeth may in particular be central incisors.

The tooth arrangement design apparatus 1 according to an embodiment automatically creates an arch line for functional and esthetic improvement according to individual patient differences. The purpose of orthodontic treatment can be divided into improvement of functional problems to solve the occlusal relationship between the upper and lower teeth for smooth chewing function, or improvement of aesthetic problems for aligning teeth when the mouth is opened. Orthodontic treatment plans and goals can be established to focus on functional and aesthetic problems according to individual differences in patients.

The tooth arrangement design apparatus 1 according to an embodiment is intended to improve the establishment of a consistent treatment plan by applying an existing general arch line or a line created manually by a user to an arch line used as a reference for tooth arrangement. To this end, a patient-specific archline can be created in consideration of aesthetic information and functional information to realize patient-specific treatment and to improve aesthetic and functional problems. And, by presenting the created arch line as a tooth arrangement standard, the treatment plan establishment time is shortened and the quality is improved.

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

Referring to FIG. 1 , an apparatus 1 for designing a tooth arrangement 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 a patient. The clinical data required for treatment may include data obtained by matching at least one of CT data, oral data, and facial data, or data obtained by matching two or more. Furthermore, the cephalo-lateral photograph, panoramic data, cephalometric X-ray data, frontal radiograph (PA X-ray) data, and the like may be further included.

The scan data is data having information on actual teeth including damaged teeth. The scan data may be dental model scan data obtained by scanning a plaster model created by imitating a patient's oral cavity with a 3D scanner. As another example, it may be oral scan data obtained by scanning the inside of the patient's mouth using a 3D intra-oral scanner. The 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 the tooth boundaries in each tomography image, and combining them into one. These scan data and CT data are images obtained by imaging the maxillary teeth under the maxillary teeth with the patient’s mouth open, images obtained by imaging the mandibular teeth above the mandibular teeth with the patient’s mouth open, and local area imaging with the mouth closed. imaging, oral radiographs, etc. The acquired CT data may be stored in the storage unit 12 . The CT data may be three-dimensional data. Through CT data, external information of the face, soft tissue, internal information, skeletal structure, and oral information can be obtained and used in dental treatment.

The controller 14 may prepare data prior to analyzing the patient's clinical data. Data preparation may include data matching, individual tooth separation, feature information extraction, and reference information extraction. Data matching refers to matching at least two data constituting clinical data. For example, in order to improve the accuracy of each information data, the 3D oral scan data and the second or 3D facial scan data may be matched to the CT data to add root information to the tooth information. Alternatively, the second original facial scan data and the three-dimensional oral scan data may be matched. By reflecting detailed information of the face through CT data or matching data matched with CT data, predictable information when changing the arrangement of teeth in the oral cavity is extended to the skeleton and face, and more accurate and visual results can be confirmed when establishing a treatment plan. . In addition, examples of the registration data may be a head photo and CT data, a head radiograph data and CT data, and an oral scan data and CT data, respectively.

The control unit 14 according to an embodiment may group the clinical data of the patient for dental treatment acquired through the data acquisition unit 10 into at least one of facial, skeletal, and oral information to determine the patient's problem ( first judgment). The face information may include at least one of lip protrusion relationship and face frontal left and right symmetry relationship information. The skeletal information may include at least one of maxilla and mandible relationship, anterior-posterior position and left-right symmetric relationship of maxilla and mandible, maxillary anterior position, maxillary anterior inclination, mandibular incisor position, mandibular anterior inclination, and maxillary and mandibular incisor angle information. Oral information includes midline relationship, anterior vertical overlay, anterior horizontal overlay, upper and lower incisor angle, canine relationship, molar relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation status and tooth arrangement status information. may include at least one of

The control unit 14 according to an embodiment may obtain a measurement value for each item of the divided information after classifying the patient's clinical data into facial, skeletal, and oral information when first determining the patient's problem. . In addition, the patient's problem may be first determined by comparison with the measured value and the reference value.

The control unit 14 according to an embodiment may group the clinical data of the patient into functional and aesthetic information to determine the patient's problem (second determination). Functional information is a large item related to occlusal function. For example, functional information includes molar occlusal relationship, canine occlusal relationship, anterior horizontal overlay, anterior vertical overlay, occlusal plane, upper and lower incisor angle, upper and lower incisor position, upper and lower incisor tilt, upper and lower incisor angle, maxilla and mandible relationship It may include at least one of information. Aesthetic information is an item that has little or no relation to occlusal function and is cosmetically reviewed. For example, the aesthetic information may include at least one of a tooth display ratio, a tooth shape, a tooth size, a tooth spacing, a tooth rotation state, a tooth arrangement shape, a lip protrusion relationship, a midline relationship, and a frontal left-right symmetry relationship information. .

Here, the first determination and the second determination may be performed simultaneously in 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.

The control unit 14 according to an embodiment determines whether a facial change is necessary for the patient when the second determination of the patient's problem is determined, reflects the facial change or the skeletal structure of the upper and lower jaws to determine the anterior positions of the upper and lower jaws, You can determine the transposition ratio of evil. In this case, whether the face change is necessary may include, for example, whether to correct the degree of lip protrusion.

Determination of anterior position For example, the control unit 14 may prioritize an anterior position range of the maxilla reflecting the skeletal structure of the maxilla. In this case, if a facial change is required, the anterior position range of the maxilla reflecting the facial change may be determined within the anterior position range of the maxilla reflecting the determined skeletal structure of the maxilla first. Finally, the anterior position of the maxilla can be determined by reflecting the relationship between the range of the anterior position of the maxilla and the occlusal plane.

As another example, the control unit 14 may prioritize the anterior position range of the mandible reflecting the skeletal structure of the mandible. In this case, if a facial change is required, the anterior position range of the mandible reflecting the facial change may be determined within the anterior position range of the mandible reflecting the determined skeletal structure of the mandible first. Finally, the anterior position of the mandible can be determined by reflecting the relationship between the range of the anterior position of the mandible and the maxillary incisors and the relationship with the occlusal plane.

For example, the control unit 14 determines the position of the adjacent teeth so that the adjacent teeth have a smaller value than the predetermined display ratio or the display ratio of the incisors based on the front display position of the maxillary incisors, The position of each maxillary tooth can be determined by considering the angle and skeletal extent. Finally, by analyzing the occlusal relationship of the mandible, the position of the maxilla and the position of the mandible of the tooth number having the occlusal relationship can be determined.

The controller 14 generates an arch line based on the results of the first determination and the second determination, and arranges the teeth along the generated arch line.

Creating an arch line, for example, the controller 14 may determine the arch line range by reflecting at least one of the skeletal information and the oral information. And, within the determined arch line range, the arch line may be generated by reflecting the occlusal conditions including the relationship between adjacent teeth and occlusal teeth based on the anterior position.

When generating the arch line, the control unit 14 generates the upper arch line so that it is larger than the lower arch line and faces the soft tissue, and the lower arch line can be generated so that it faces the lingual side compared to the upper arch line. .

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

The controller 24 according to an exemplary embodiment may receive a patient opinion according to individual patient differences through the input unit 16 and reflect it when generating an arch line. Patient comments may include essential and additional improvements.

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

The output unit 18 displays a screen according to the operation of the control unit. For example, an upper incisor position, a mandibular incisor position, an arch line, a 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 correction such as movement and rotation of the tooth arrangement data displayed on the screen is received through the output unit 18 . The input unit 16 may receive, from the user, setting values for facial information, skeletal information, oral information, etc. extracted from the patient's clinical data. For example, the position of the facial lips according to the position of the maxillary anterior teeth may be set at various ratios designated by the operator. The input unit 16 may receive an input of a patient's opinion according to individual differences of the patient.

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

1 and 2, the tooth arrangement design device 1 determines the patient's problem by grouping the patient's clinical data into facial, skeletal and oral information (S210; first judgment). Measurement information necessary for the first judgment on the patient's problem includes facial information, skeletal information, oral information, and the like.

The facial information includes lip protrusion relationship (upper and lower lip protrusion or not) and facial frontal left-right symmetry relationship information. Skeletal information includes maxilla and mandible relationship (anteroposterior position and left-right symmetry of maxilla and mandible), maxillary anterior position, maxillary anterior inclination, mandibular incisor position, mandibular incisor inclination, and maxillary and mandibular incisor angle information. Oral information includes midline relationship, anterior horizontal overlay (Overjet), anterior vertical overlay (Overbite), upper and lower incisor angle, canine relationship, molar relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, and tooth arrangement information.

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

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

Functional information includes posterior occlusal relationship, canine occlusal relationship, anterior occlusal relationship, anterior horizontal overlay, anterior vertical overlay, occlusal plane (speaker curve, Wilson curve), upper and lower incisor angle, upper and lower incisor position, upper and lower incisor tilt, maxillary and mandibular These items are highly related to the occlusal function, such as anterior angle, maxilla and mandible relationship information. Aesthetic information has little to do with occlusal function, such as tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation status, tooth arrangement shape (archline), lip protrusion relationship, midline relationship, and facial frontal left-right symmetry relationship information. No, it is cosmetically reviewed.

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

By additionally reflecting functional and esthetic information to facial, skeletal and oral information, a patient-customized archline can be automatically created, and the created patient-customized archline can be presented as a tooth arrangement standard.

Specifically, the tooth arrangement design apparatus 1 generates an arch line based on the first determination and the second determination result ( 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 occlusal conditions (adjacent teeth, occlusal tooth relationship) is generated. For example, a flat arch line of a structure capable of maintaining an occlusal relationship with adjacent teeth in close contact with the determined upper and lower anterior teeth is created. To calculate the range in which the root of the teeth in the upper and lower skeletons can be located, and consider the angle information of the crown of the tooth with the occlusal surface, the tooth arrangement of the structure that can be occluded so that all the teeth of the maxilla can cover all the teeth of the mandible Create a possible archline. That is, the maxillary tooth alignment arch line should be larger than the mandibular tooth alignment arch line and should face soft tissue, and the mandibular tooth alignment arch line should be disposed at a position facing the lingual side.

Then, the teeth are arranged along the generated arch line and displayed on the output unit (S250). For example, moving individual teeth into a tooth alignment that coincides with the positioned upper and lower arch lines.

Before the tooth arrangement and display step (S250), a step (S240) of securing a space by determining the tooth arrangement limitation may be further performed. In the space securing step ( S240 ), when the tooth arrangement along the arch line, when the range of the planned tooth arrangement exceeds the limit range of the skeleton, the space necessary to enable the tooth arrangement within the limit range can be secured. For example, the necessary space is secured so that the planned tooth arrangement is possible in consideration of additional items such as interdental preparation, arch extension, and tooth extraction. Then, in the secured space, the teeth may be arranged according to the arch line and displayed on the output unit (S250).

Furthermore, the device for designing tooth arrangement 1 may further perform the steps of establishing a treatment plan, performing treatment, providing results according to treatment, and confirming prognosis.

In the treatment plan establishment stage, the user and the patient can change the tooth arrangement by reviewing the occlusal relationship by finally reflecting the user's or patient's opinion while checking the improved tooth arrangement, and if necessary, correcting the arch line. The predicted tooth alignment status and planned matters should be performed with the consent of the patient after sufficient explanation from the user, and the final tooth alignment goal is confirmed. Save all the final aligned tooth positions and finalize the treatment plan.

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

3 is a table summarizing items required for each step of determining a patient's problem according to an embodiment of the present invention.

Referring to FIGS. 1 and 3 , in the step of collecting the patient's opinion, the tooth arrangement design device 1 identifies the items that the patient needs or additionally wants to improve.

Then, after grouping clinical data into facial, skeletal and oral information, the patient's problem is determined (first judgment), and after grouping into functional and aesthetic information, the patient's problem is judged (second judgment). For example, items classified as facial, skeletal, and oral information for the first determination may be classified differently as functional and aesthetic information for the second determination. The first judgment is to judge the problem based on the facial, skeletal, and oral standards, and the second judgment is to judge the problem based on the functional and aesthetic criteria. The first determination and the second determination may be performed as separate steps, and problems may be comprehensively determined as each is performed simultaneously or combined into one step.

The lip protrusion relation item is classified as facial information when the first judgment is made on the problem, and is classified as aesthetic information when the second judgment is made. In the process of judging the problem centering on the protrusion of the lips, the E-Line connecting the tip of the nose and the tip of the chin or additionally a specific location designated by the user is checked to determine whether the upper and lower lip protrusion to decide By selecting various criteria according to race, gender, and age, differences can be identified, and improvement can be expected through other problems, especially by changing the anterior position.

The facial frontal left-right symmetry relationship is classified as facial information when the first judgment is made on the problem, and is classified as aesthetic information when the second judgment is made. In the process of judging the problem centering on the frontal left-right symmetry relationship of the face, check the symmetry relationship by examining the left-right symmetry ratio and inclination with a specific location designated by the user or additionally 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-right ratio.

The maxilla/mandibular relationship is classified as skeletal information when a first judgment is made on a problem, and is classified as functional information when a second judgment is made. In the process of problem determination using the maxilla/mandibular relationship, the protrusion of the maxilla and mandible is determined by combining the anterior and posterior positions and angles of the line connecting the feature points of the lateral skeleton. Changes in skeletal position that are adjusted by improving the position and arrangement of teeth without jaw surgery are limited, so adjustment of the range of motion is included. Since the position of the upper and lower mandibles is closely related to the measurement items in the face, it is possible to maintain the standards when identifying problems and establishing a treatment plan.

The midline relationship is classified as oral information in the first judgment on the problem and aesthetic information in the second judgment. In the problem determination stage using the midline relationship, the upper and lower incisors are determined based on the facial midline. However, the midline of the face and the position of the maxillary and mandibular incisors are matched, except for cases where the position of the upper and lower incisors cannot be positioned in the same way as the midline due to the number of teeth or additional diagnosis. If both the upper and lower midlines cannot match depending on the patient's individual circumstances, the result of giving weight to the position of the upper and lower midlines is presented, and finally, the midline relationship reflecting the user's opinion is applied.

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

If a facial change is necessary, calculate the range of the anterior position of the maxilla according to the facial change and apply the following sequentially. Although the crown portion of the tooth protrudes to the outside of the gum, the root can perform the function of the tooth only when it is located in the skeletal region inside the gum surrounded by the gum. The movement range of the maxillary anterior teeth must be adjusted because tooth movement must be performed only within the range where the skeleton can stably position the tooth root. Therefore, the range of the anterior position of the maxilla reflecting the skeletal structure of the patient is adjusted. The anterior position range of the maxilla takes precedence over the limit range of the skeleton, and the position range according to facial changes should be applied so that it is included within the skeleton limit condition. After the anterior position range of the maxilla is determined, it may be necessary to reflect the angle information of the teeth. This allows the factor determining the angle of the occlusal plane and the crown or the maximum approximation that can be reflected within the angle or movement range that reflects the value diagnosed by the operator, so that the final anterior position of the maxilla can be determined.

The position of the mandibular incisors is classified as skeletal information when a first judgment is made on a problem, and is classified as functional information when a second judgment is made. In the problem determination stage using the mandibular incisor position, when determining whether facial changes are necessary or not, the range of the anterior position of the mandible is determined according to the facial changes, and information that can further improve skeletal and oral problems and the determined maxillary anterior position It is possible to determine the position of the incisors of the mandible by adding the occlusal relationship information in the state where the incisors are fixed. After determining the anterior position of the maxilla, the position range of the mandibular incisors is determined by reflecting the anterior position range of the mandible according to facial changes and the incisor position range of the mandible that the mandible skeleton has, such as the incisors of the maxilla. After the position range of the mandibular incisors is confirmed, the position of the mandibular incisors is finally determined by applying the following conditions. For example, the angle information of the long axes of the maxillary incisors and the mandibular incisors, the horizontal overlay of the anterior/posterior positions, and the vertical overlay of the upper/lower positions, combine a total of three types of information, which each item can have. The final anterior position of the mandible can be determined so that it can have a value that reflects the value or the value diagnosed by the surgeon, or has the maximum approximation.

Occlusal conditions including molar relationship, canine relationship, occlusal plane, etc. are classified as oral relationship in the first judgment on the problem, and the oral relationship in the second judgment. In particular, the occlusal condition can be used in the arrangement of teeth of the maxilla and mandible. For example, the occlusal conditions required for aligning maxilla and mandible teeth are as follows.

Adjacent teeth must be in close contact. The maxillary canine is located between the mandibular canine and the first premolar. 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 the buccal cusps of the mandible are located more lingual than all the buccal cusps of the maxillary teeth.

The created maxillary and mandibular arch lines can be modified to enable tooth arrangement that should include the above items by default, and the arch line for tooth arrangement that can reflect additional items according to the operator's diagnosis result can be modified. The finally determined arch line can be applied during tooth alignment or for the purpose of confirming the result of tooth alignment.

4 is a diagram illustrating a detailed process for determining a patient's problem by additionally considering functional and aesthetic information in oral, skeletal, and oral information according to an embodiment of the present invention.

1 and 4, the tooth arrangement design apparatus 1 determines whether a facial change is necessary (S410). In this case, it is possible to determine whether an eye change is necessary through problem diagnosis, or whether an eye change is necessary according to a patient's request.

Since the position of the maxillary and mandibular incisors is a factor that directly or indirectly affects facial changes, especially the lip position, information on the location range where the upper and lower incisors should be located is determined depending on whether facial changes are necessary. After it is determined that a change is necessary in the face change necessary determination step, the following procedure can be followed in detail. Since the lip part of the face has a structure in which soft tissues protrude or retract depending on the position of the anterior teeth in the oral cavity, the maxillary incisors must move forward in order for the upper labia to move forward, and the maxillary incisors move backward in order for the upper labia to move backward. Teeth alignment is essential. The lower labia should also be accompanied by the position of the mandibular incisors according to the position of the lower labia in the same principle. The effect of intraoral movement of anterior teeth on the facial lips can be analyzed by various factors such as the thickness, structure, and position of the soft tissue of the lip of the patient, but it must be checked as the anterior position necessarily affects the protrusion of the lips directly or indirectly. It is an important factor that must be In this case, the position of the facial lips according to the position of the maxillary incisors can be applied at a predetermined ratio or various ratios designated by the operator, and the relation between the change position of the lips and the position change of the incisors can be reflected no matter which ratio is applied. Alternatively, if a change in the lips is not required, the position of the current upper and lower incisors must be fixed in order to arrange the teeth without facial changes.

In addition, the angle between the nose and the upper labia, that is, the change in the nasal angle, among the location information of the upper labia, is an additional matter that is affected by the position of the maxillary anterior teeth differently from the change in the lower labia. In addition to 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 labial angle. . In order to reduce the labial angle, it should have an angle protruding forward together with the maxillary anterior position. When determining whether facial changes are necessary based on the above, it is essential or additionally performed to estimate the position of the upper and lower teeth.

Then, the tooth arrangement design device 1 determines the position of the maxillary anterior teeth (S420). For example, the range according to whether or not a facial change is required is set as an intermediate priority, and the maxillary anterior movement range is calculated with a high priority in the tooth movement range according to the structure of the maxilla. The position and angle of the left and 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 with the mandibular incisors.

Then, the tooth arrangement design device 1 determines the mandibular anterior position (S430). For example, a range according to whether or not a facial change is required is set as an intermediate priority, and a tooth movement range according to the structure of the mandible is set as a high priority, and then the mandibular incisor movement range is calculated. In this case, the position and angle of the left and right mandibular incisors can be comprehensively reviewed. Finally, the position of the mandibular incisors can be determined by considering the relationship between the maxillary incisors and the occlusal surfaces.

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

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

1 and 5, the tooth arrangement design device 1 groups the patient's clinical data into facial, skeletal and oral information, respectively, and groups the functional and aesthetic information, and then groups the items grouped into each group. Analyze and determine the patient's problem (a). 5 (a) shows an example of analyzing the non-labial angle 510 of the upper lip.

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

Then, the tooth arrangement design device 1 determines the upper and lower anterior teeth ratio (c). At this time, based on the frontal display position of the maxillary incisors, the position of the adjacent teeth is determined so that the adjacent teeth have a value smaller than the predetermined display ratio or the display ratio of the incisors, and the position of each maxillary tooth in consideration of the angle and skeletal range can be decided In addition, by analyzing the occlusal relationship of the upper and lower jaws, it is possible to determine the position of the maxilla and the position of the mandible of the tooth number having the occlusal relationship.

Next, an arch line 550 is generated based on the determined position of the anterior teeth 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). In this case, the arch line 550 may be generated such that the upper arch line is larger than the lower arch line and faces the soft tissue, and the mandibular arch line is positioned toward the lingual side compared to the upper arch line. When arranging teeth along 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 to enable the arrangement of the teeth within the limit.

Reference numeral 530 denotes the patient's original teeth before orthodontic treatment, and the area indicated by a dotted line of reference numeral 540 denotes 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 teeth 530 and the newly arranged teeth 540 are displayed differently, or the original teeth 530 are indicated by a solid line. As a result, the newly arranged teeth 540 may be displayed in other formats, such as represented by a dotted line.

So far, the present invention has been focused on the embodiments thereof. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be reflected in an illustrative rather than a restrictive point of view. The scope of the present invention is indicated 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 (13)

A first determination step of grouping the clinical data of the patient for dental treatment into at least one of facial, skeletal and oral information to determine the patient's problem;
a second determination step of grouping the patient's clinical data into functional and aesthetic information to determine the patient's problem;
generating an arch line based on the first and second determination results; and
arranging the teeth along the generated arch line and displaying the arranged teeth on the output unit;
A tooth arrangement design method comprising a. The method of claim 1,
The face information includes at least one of lip protrusion relationship and face frontal left and right symmetry relationship information,
Skeletal information includes at least one of maxilla and mandible relationship, anterior-posterior position and left-right symmetry relationship of maxilla and mandible, maxillary anterior position, maxillary anterior tilt, mandibular incisor position, mandibular incisor tilt, and maxillary and mandibular incisor angle information,
Oral information includes midline relationship, anterior vertical overlay, anterior horizontal overlay, upper and lower incisor angle, canine relationship, molar relationship, occlusal plane, tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation status, and tooth arrangement status information. A tooth arrangement design method comprising at least one of. The method of claim 1,
Functional information includes at least one of molar relationship, canine relationship, anterior horizontal overlay, anterior vertical overlay, occlusal plane, upper and lower incisor angle, upper and lower incisor position, upper and lower incisor tilt, upper and lower incisor angle, maxilla and mandible relationship information do,
The esthetic information is tooth arrangement, characterized in that it includes at least one of tooth display ratio, tooth shape, tooth size, tooth spacing, tooth rotation state, tooth arrangement form, lip protrusion relationship, midline relationship, and frontal left-right symmetry relationship information design method. The method of claim 1, wherein the first determining 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 patient's problem by comparing the measured value and the reference value;
A tooth arrangement design method comprising a. The method of claim 1, wherein the second determining step comprises:
Determining whether the patient's facial changes are necessary;
Determining the anterior position of the upper and lower jaw by reflecting facial changes or the skeletal structure of the upper and lower jaws; and
determining an incisor ratio of the upper and lower jaws;
A tooth arrangement design method comprising a. 6. The method of claim 5, wherein determining the transposition comprises:
Determining the anterior position range of the maxilla reflecting the skeletal structure of the maxilla as a priority;
If facial changes are necessary, first determining an anterior position range of the maxilla reflecting facial changes within an anterior position range of the maxilla reflecting the determined skeletal structure of the maxilla; and
determining an anterior position of the maxilla by reflecting the relationship between the anterior position range of the maxilla and the occlusal plane;
A tooth arrangement design method comprising a. 6. The method of claim 5, wherein determining the transposition comprises:
Determining a priority range of the anterior position of the mandible reflecting the skeletal structure of the mandible;
If a facial change is required, first, determining an anterior position range of the mandible reflecting the facial change within the anterior position range of the mandible reflecting the determined skeletal structure of the mandible; and
determining an anterior position of the mandible by reflecting the relationship between the anterior position range of the mandible and the maxillary incisors and the relationship with the occlusal plane;
A tooth arrangement design method comprising a. The method of claim 5, wherein the step of determining the anterior ratio of the upper and lower jaws
Based on the frontal display position of the maxillary incisors, the position of the adjacent teeth is determined so that the adjacent teeth have a smaller value than the set display ratio or the display ratio of the incisors, and the position of each maxillary tooth is determined by considering the angle and skeletal range to do; and
Analyzing the occlusal relationship of the upper and lower jaw to determine the position of the upper and lower teeth of the tooth number having an occlusal relationship;
A tooth arrangement design method comprising a. The method of claim 1 , wherein the step of creating an arch line comprises:
determining an arch line range by reflecting at least one of skeletal information and oral information; and
generating an arch line by reflecting occlusal conditions including the relationship between adjacent teeth and occlusal teeth based on the anterior position within the determined arch line range;
A tooth arrangement design method comprising a. The method of claim 1 , wherein the step of creating an arch line comprises:
A method for designing a tooth arrangement, characterized in that the arch line of the maxilla is created to be larger than the arch line of the mandible and faces the soft tissue, and the arch line of the mandible is generated to face the lingual side compared to the arch line of the maxilla. The method according to claim 1, wherein the tooth arrangement design method is
When arranging teeth according to the arch line, when the range of the planned tooth arrangement exceeds the limit range of the skeleton, securing a space necessary to enable the tooth arrangement within the limit range;
Tooth arrangement design method, characterized in that it further comprises. The method according to claim 1, wherein the tooth arrangement design method is
receiving an input of a patient's opinion according to individual patient's differences and reflecting it when creating an arch line;
Tooth arrangement design method, characterized in that it further comprises. a data acquisition unit for acquiring clinical data of a patient;
After determining the patient's problem by grouping the patient's clinical data for dental treatment into at least one of facial, skeletal and oral information, and grouping the patient's clinical data into functional and aesthetic information, the patient's problem is determined a controller for generating an arch line based on the results and arranging the teeth along the created arch line; and
an output unit for displaying a screen according to the operation performance of the control unit;
A tooth arrangement design device comprising a.

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