WO2010013986A2

WO2010013986A2 - Method for changing arrangement of soft tissue and dental instrument manufactured using same

Info

Publication number: WO2010013986A2
Application number: PCT/KR2009/004322
Authority: WO
Inventors: 이태경
Original assignee: Yi Tae-Kyoung
Priority date: 2008-08-01
Filing date: 2009-08-03
Publication date: 2010-02-04
Also published as: KR20100013822A; WO2010013986A3

Abstract

The present invention relates to a method for arranging a soft tissue using image data and a dental instrument manufactured using said method, and more particularly, to a method for arranging a soft tissue using image data wherein a target soft tissue arrangement for orthodontics can be easily obtained after a soft tissue model in an oral cavity is segmented into slices including an individual tooth and a part of the corresponding soft tissue, and arranging image data of each segmented slice in consideration of the occlusal relationship of teeth, and to a dental instrument manufactured using the method. The soft tissue arrangement method of the present invention comprises the steps of obtaining image data for a soft tissue model in the oral cavity representing an initial soft tissue arrangement; obtaining image data for slices including a part of a soft tissue constituting the soft tissue model, and an individual tooth; obtaining image data representing the target soft tissue arrangement using an image for each of the slices; and obtaining image data representing a stepwise soft tissue arrangement for a partial movement of teeth using the image data representing the initial soft tissue arrangement and the image data for the target soft tissue arrangement. The soft tissue arrangement method according to the present invention has advantages of enabling easy and efficient establishment of a stepwise orthodontic treatment plan, and enabling easy manufacture of a dental instrument for orthodontic treatment using image data for a stepwise soft tissue arrangement.

Description

Soft tissue array conversion method and dental instrument manufactured using the same

The present invention relates to a method for arranging soft tissues and a dental instrument manufactured using the same, and more particularly, to a method for arranging teeth or soft tissues for establishing a correction plan for orthodontics and manufacturing a dental instrument accordingly. will be.

In general, when undergoing a rearrangement of the teeth for cosmetic purposes or other reasons, orthodontic appliances, called orthodontics, are inserted into the teeth to correct the orthodontics. There are a variety of mechanisms for such orthodontics, such as brackets, arcwires, o-rings, and the like.

Orthodontics first look at the current tooth alignment and then establish the target tooth alignment after appropriate correction. Once the target tooth arrangement is established, it is not a movement from the current tooth alignment to the target tooth alignment at a time, but rather divided into several stages to correct the teeth gradually. Therefore, orthodontic treatment requires many procedures and it takes a long time.

Orthodontics is closely related to the skeleton of the face as well as the teeth, and requires oral examination and various examinations including X-ray images. In order to establish the target tooth alignment in orthodontics, the dentist creates an oral dental model using X-ray photographs or tensile materials of the patient's teeth and jaw structure, and then selects the appropriate target tooth based on the dentist's experience. It is common to establish an arrangement. In addition, the orthodontic treatment is not performed at once with the target tooth arrangement, but as the orthodontic treatment is performed in several stages, the dentist visits the dentist several times to take an X-ray photograph or meet with a dentist. Accordingly, there is a problem that a lot of time is required for orthodontics, and a lot of costs are required for orthodontics, such as having a meeting with a dentist in charge.

In addition, there is a problem that the orthodontic treatment is made in the old-fashioned manner and visit the hospital several times for orthodontic treatment, based on the experience of the dentist in establishing the target tooth arrangement.

In addition, recently, in the case of transparent calibration that uses a transparent plastic mold shaped like a mouthpiece instead of a prosthetic device for correcting appearance, a tooth pattern is produced to make transparent plastic for transparent calibration at each step of orthodontic treatment. There is a costly and cumbersome problem such as floating.

In order to solve the above problems, the present invention divides the soft tissue model in the oral cavity into segments including individual teeth and a portion of the corresponding soft tissue, and arranges the image data of each segment in consideration of the occlusal relationship of the teeth. The present invention provides a soft tissue arrangement method for obtaining a target soft tissue array for orthodontic treatment and easily performing orthodontic treatment using image data thereof, and a dental instrument manufactured by using the same.

In order to achieve the above object, the soft tissue arranging method of the present invention comprises the steps of: obtaining image data for an oral soft tissue model representing the initial soft tissue arrangement; Obtaining image data of a section including a portion of soft tissue and individual teeth constituting the soft tissue model; Obtaining image data representing a target soft tissue arrangement using the image for each section; And obtaining image data representing the soft tissue array step by step for partial movement of the teeth by using the image data representing the initial soft tissue array and the image data of the target soft tissue array.

In addition, the soft tissue model is a gypsum model representing the initial soft tissue arrangement, and image data for the initial soft tissue model is obtained using a three-dimensional scan.

In addition, the soft tissue model is a gypsum model representing the initial soft tissue arrangement, the image data for each section is segmented into segments containing a portion of the soft tissue corresponding to the individual teeth in the gypsum model three-dimensional each segment Get scanned.

In addition, the image data for each section is obtained by separating an image included in a portion of the soft tissue corresponding to the individual teeth from the image data representing the initial soft tissue array.

In addition, the soft tissue model is a setup model used for orthodontic treatment, and image data for the target soft tissue array is obtained using the three-dimensional scan after combining the sections with the setup model.

In addition, image data representing the target soft tissue array is obtained after arranging each section through an occlusion collision process using the image data for each section.

In addition, image data representing the target soft tissue array is obtained after arranging the sections based on the image data in which CT image data of the oral structure is matched with the image data for the soft tissue model.

In addition, the soft tissue model is a gypsum model representing the initial soft tissue array, the image data representing the target soft tissue array is segmented into segments containing a portion of the soft tissue corresponding to the individual teeth in the gypsum model considering the occlusal relationship of the individual teeth After each of the sections are rearranged, they are obtained using a three-dimensional scan.

In addition, the step of obtaining the image data indicating the soft tissue array for each step further includes the step of adjusting the soft tissue arrangement for each step in consideration of the occlusal relationship, movement interference and biomechanical hazard of the teeth during movement.

In addition, the step of obtaining the image data representing the soft tissue array step by step for the partial movement, the step of setting any reference point coordinates in the image data for each section; Extracting a path between the initial soft tissue array and the target soft tissue array using the reference point coordinates; And arranging the image data for each section so as to space the extracted path by a predetermined distance to obtain image data indicating the soft tissue array for each step.

In addition, the reference point is set to three or more for each section, characterized in that set in the soft tissue contained in each section.

The setting of the reference point coordinates may include setting reference point coordinates in the soft tissue of each segment in the matched image data after matching the image data for each segment with the image data representing the initial soft tissue array. It features.

In addition, the paths of the initial soft tissue array and the target soft tissue array may be matched to the image data representing the target tooth array in which the reference point coordinates are set to the image data representing the target tooth array, and then the respective soft tissue arrays and the target soft tissue arrays. Extract using reference point coordinates.

In addition, after obtaining the image data representing the step-by-step soft tissue array for the partial movement, further comprising the step of manufacturing a dental instrument for the step-by-step soft tissue array.

In addition, the dental instruments for the soft tissue array in stages are manufactured using RP.

In addition, the dental instrument for the soft tissue array in stages is produced through CAD / CAM using the image data representing the soft tissue array in stages.

In order to achieve the above object, a dental instrument manufactured using the soft tissue arranging method of the present invention is manufactured using an image representing the soft tissue arranging obtained by the soft tissue converting method.

The present invention having the above configuration has the effect of easily and efficiently establishing an optimal orthodontic plan for each patient.

In addition, it is effective to establish a systematic correction plan with only one examination without taking multiple X-ray photographs or making tooth patterns.

In addition, there is an effect that can be easily produced in conjunction with the orthodontic treatment plan when the production of dental instruments for each step can be easily produced.

In addition, it is possible to manufacture the calibration device precisely and accurately, overcoming the limitations of surface roughness, step, etc. of the conventional base model for the manufacture of some calibration device.

In addition, as the process of manufacturing the base model is simplified, the process time required to make the calibration apparatus is relatively short.

In addition, as image data is obtained by segmenting the tooth and the soft tissue into pieces, there is an effect of obtaining more accurate and accurate image data.

1 is a flow chart showing a soft tissue arrangement method according to the invention,

2 is a view showing an example of image data of a section including a portion of individual teeth and soft tissue,

3 is a view showing a state before matching of image data for fragments with the image data indicating the initial soft tissue arrangement,

4 is a view showing a state in which the image data representing the initial soft tissue arrangement and the image data for the section is matched,

5 is a view showing a process of obtaining a soft tissue arrangement step by step using a reference point by the soft tissue arrangement method according to the present invention.

Hereinafter, a method for determining occlusion state and digital articulator through digital data according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart illustrating a method of arranging soft tissues according to the present invention. In the soft tissue arranging method according to the present invention, first, image data is obtained for an oral soft tissue model indicating an initial soft tissue arrangement indicating a soft tissue arrangement before correction (step S10). Can be classified as The soft tissue model can be obtained through various methods. Typically, the impression material is inserted into the oral cavity to allow the patient to bite for a certain time, and then the impression material is hardened and then taken out to obtain a soft tissue model such as plaster. In step S10, image data of the soft tissue model in the oral cavity obtained through various methods is obtained. For example, a soft tissue model made of gypsum or the like may be obtained by using a 3D scanning device to obtain image data of the soft tissue model. In addition to the three-dimensional scan of the plaster model, image data for the initial soft tissue model can also be obtained through an intra oral scanner. In addition, it is possible to obtain image data using CT, but in order to clearly distinguish between soft tissue and cheek, it is preferable to use a CT scan in which the patient artificially inflates the cheek or use a device that separates the cheek from the soft tissue.

After obtaining the image data showing the initial soft tissue arrangement, it is segmented into sections containing individual teeth, each of which contains individual teeth to be corrected and a portion of soft tissue corresponding to the individual teeth (step S20). Correction is made by properly moving the teeth and for this purpose, the device is equipped with orthodontic devices. Teeth can be classified as crowns on the gums and roots embedded in the gums. The present invention obtains the image data of the gum through the soft tissue model in step S10. If the tooth is moved in this state, the soft tissue constituting the soft tissue model is also moved at the same angle. Therefore, the soft tissues are moved in the same way as the teeth are moved, so that the movement of the soft tissue corresponding to each tooth in the lower part of the teeth can be utilized for the correction of the orthodontics. In addition, the present invention obtains the image data of the initial soft tissue arrangement through the soft tissue model in the oral cavity and separates into segments consisting of individual teeth and soft tissues corresponding to the individual teeth, and then utilizes the image data of the separated sections. This is because not only the amount of movement of individual teeth is not the same according to the state, but in order to obtain an optimal dental structure in consideration of the occlusal relationship of the teeth, it is more efficient to separate and move freely into segments containing individual teeth. The image data for the target soft tissue array can be obtained from the image data of the initial soft tissue array using the image data, but the soft tissue model can be fabricated as an orthodontic setup model, and the fragments containing the teeth and some soft tissues can be physically attached directly to the setup model. The target soft tissue array can be moved to obtain image data through 3D scanning. Using this method, although some manufacturing process is added, the conventional treatment process can be used as it is, there is a convenient and efficient feature.

FIG. 2 shows an example of image data of a section including individual teeth and a portion of soft tissue, wherein each section includes an individual tooth 10 and a portion of soft tissue 12 corresponding to each tooth. Image data of these sections can be obtained in various ways for all teeth. First, when the soft tissue model obtained in the oral cavity is made of gypsum, the gypsum model may be separated into sections including individual teeth, and then image data may be obtained by 3D scanning. The above method has the effect of obtaining accurate data for each section.

Alternatively, the image data for each tooth can be obtained by separating the image for each tooth from the image data of the soft tissue model made of plaster obtained in step S10. In this case, since the image data for each section is obtained by using the already obtained image data, there is an advantage that no separate work is required, but in terms of accuracy, it is more accurate than the case where the image data is obtained from the separated section after separating the plaster model. Falls in terms of accuracy. In other words, when using a non-contact optical scanner that can extract high-resolution images to obtain image data from the plaster model, some blind spots cannot be scanned because the light of the optical scanner does not penetrate into the space between the teeth, so the accuracy of the image data Has the problem of falling. On the other hand, the present invention can obtain more accurate image data because the image data is obtained after separating into pieces.

After obtaining the image data for each section, the image data for the sections are rearranged to obtain a target soft tissue array representing the corrected tooth arrangement (step S30). The target soft tissue array first includes the image data for the initial soft tissue array and each section. After the image data is matched, each tooth is moved and rearranged by considering various factors such as occlusal relationship and appearance of each tooth. As described above, the image data of the target soft tissue array can be obtained by rearranging each segmented tooth and soft tissue fragments on the articulator according to the intuitive process of the technician in the setup model, and then performing the imaging process such as scanning again. The image data of each section and the image data for the initial soft tissue array can be matched by various methods. For example, the image data of some soft tissue and the initial soft tissue array included in each section is matched through surface matching. Surface matching is performed by extracting the phase when the sum of various scalar values of the distance between two image surface point groups is minimized through statistical method of each surface point group data. The image data of the target soft tissue arrangement can be obtained by rearranging and moving each section in consideration of the patient's appearance, the arrangement of the teeth, and the occlusal relationship between the teeth. The target soft tissue array can be obtained by scanning a plaster model in which each tooth and soft tissue section is rearranged on the articulator through an intuitive work process of a technician, or the matching image data matching each segment and the initial soft tissue array image is placed on the digital articulator. Each section can then be moved and obtained to reflect the calibration plan of the orthodontist.

3 and 4 are diagrams showing before and after matching of image data representing an initial soft tissue arrangement and image data for a slice, respectively. After acquiring the image data for the initial soft tissue array and the image data for each section as described above, match the initial soft tissue array and the image data of each section through the surface matching of the soft tissue, Rearrangement yields the target soft tissue arrangement.

In addition, the target soft tissue array may be obtained by using the image data obtained by matching the CT data reflecting the patient's oral condition to the matching data of the initial soft tissue array and the segment image data. In this case, not only the movement of the root can be included in the orthodontic treatment plan, but also the facial appearance can be obtained from the CT image and include a corrective relationship with soft tissues such as the lips from an aesthetic point of view.

Obtaining the image data for the target soft tissue array will have an image element that is common to the initial soft tissue array, which allows the extraction of individual tooth movement paths. In other words, after the reference point is assigned to the soft tissue of each segment including each individual tooth, the movement path of the reference point in the initial soft tissue array and the target soft tissue array may be extracted to determine the movement path of the soft tissue including the individual teeth. It is preferable that at least three reference points are given for use in extracting the movement path. This is because the movement of individual teeth can be made in the x-axis, y-axis, and z-axis directions, and at least three reference points must be given to extract the movement path more accurately. Of course, since the movement of the tooth is not freely made in all axes, the movement path can be extracted through the two reference points, but it loses a little in terms of accuracy.

After assigning a reference point to the soft tissue and comparing the image data of the initial soft tissue array and the target soft tissue array and extracting the movement path of the tooth or soft tissue, the soft tissue array for the partial movement is divided by n equal parts of the movement path of each tooth or soft tissue. Obtain image data representing. Of course, image data can also be obtained through a nonlinear method. In the orthodontics, some orthodontic instruments, for example, transparent orthodontics, are orthodontically corrected in stages, so that the braces are manufactured several times until the final correction. Of course, the movement pattern of each step may be corrected by considering the occlusion, movement interference, and biomechanical hazard. In the conventional case, there is a problem that the orthodontic treatment process is cumbersome and expensive, such as establishing a step-by-step correction plan based on the individual experience of the doctor in charge of the step-by-step brace or making a dental model for each brace. same. In the present invention, after dividing each tooth into sections and obtaining image data of the target soft tissue array consisting of the sections, the path is extracted in contrast to the image data of the initial soft tissue array. In addition, the reference point is assigned to the soft tissue included in each section for the path extraction, and the path can be extracted more efficiently and accurately by using the assigned reference point.

5 is a view showing a process of obtaining a soft tissue arrangement step by step using a reference point by the soft tissue arrangement method according to the present invention. Reference numeral 30 in FIG. 5 denotes image data obtained by matching data about fragments to the initial soft tissue array, and reference numeral 40 denotes image data of the target soft tissue array rearranged in consideration of the occlusal relationship between teeth. A1-A4 shows the movement path of each section, and is extracted through the movement of the reference point given to the soft tissue as described above.

After dividing the extracted path by n, the method may further include obtaining image data representing a stepwise soft tissue arrangement for partial movement. Step-by-step dental instruments, for example, can be made only by step-by-step soft tissue arrangement. As described above, the movement of teeth and the movement of soft tissues corresponding to the teeth have the same pattern. By making a device and attaching the device for each tooth to the manufactured dental device, it is possible to create a dental device including an array of teeth. By using the dental instruments thus made it is possible to produce a device for orthodontics, for example a transparent orthodontic device.

As described above, the soft tissue arrangement method of the present invention can establish an optimal orthodontic treatment plan for each patient at a time without a separate test or procedure after obtaining data on the X-ray, CT and the arrangement of the teeth. In addition, it is possible to produce dental instruments up to the final correction at a time, and there is an effect that can be performed optimally objectively irrespective of the dentist's experience.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited to this specific embodiment, and those skilled in the art within the scope described in the claims of the present invention Changes may be made as appropriate.

The present invention has the effect of easily and efficiently establishing an optimal orthodontic plan for each patient. In addition, it is effective to establish a systematic correction plan with only one examination without taking multiple X-ray photographs or making tooth patterns. In addition, there is an effect that can be easily produced in conjunction with the orthodontic treatment plan when the production of dental instruments for each step can be easily produced. In addition, it is possible to manufacture the calibration device precisely and accurately, overcoming the limitations of surface roughness, step, etc. of the conventional base model for the manufacture of some calibration device. In addition, as the process of fabricating the base model is simplified, the time required to make the orthodontic device is relatively short, and the image data is obtained by segmenting into fragments including a part of the tooth and the soft tissue, thereby obtaining more accurate and accurate data. There is an effect of obtaining accurate image data, which has industrial applicability.

Claims

Obtaining image data of an oral soft tissue model representing an initial soft tissue arrangement;

Obtaining image data of a section including a portion of soft tissue and individual teeth constituting the soft tissue model;

Obtaining image data representing a target soft tissue arrangement in consideration of the aesthetic functional relationship of the oral structure with respect to the oral soft tissue model;

Soft tissue array transformation method comprising the step of obtaining the image data representing the soft tissue array step by step for the partial movement of the teeth by using the image data representing the initial soft tissue array and the target soft tissue array.
The method of claim 1,

The soft tissue model is a gypsum model representing the initial soft tissue arrangement,

Soft tissue array transformation method characterized in that the image data for the initial soft tissue model is obtained by using a three-dimensional scan.
The method of claim 1,

The soft tissue model is a gypsum model representing the initial soft tissue arrangement,

The image data for each section is a soft tissue array transformation method, characterized in that obtained by three-dimensional scanning each segment after the segment containing a portion of the soft tissue corresponding to the individual teeth in the plaster model.
The method of claim 1,

The soft tissue array transformation method of claim 1, wherein the image data for each segment is obtained by separating an image included in a part of soft tissue corresponding to an individual tooth from the image data representing the initial soft tissue array.
The method of claim 1,

The soft tissue model is a setup model used for orthodontic treatment,

Soft tissue array transformation method characterized in that the image data for the target soft tissue array is obtained by using the three-dimensional scan after combining the segment with the setup model.
The method of claim 1,

The soft tissue array conversion method, characterized in that the image data representing the target soft tissue array is obtained after arranging each section through the occlusal collision inspection process using the image data for each section.
The method of claim 6,

The soft tissue array transformation method of claim 1, wherein the image data representing the target soft tissue array is obtained after arranging the sections based on the image data obtained by matching CT image data of the oral structure to the image data of the soft tissue model.
The method of claim 1,

The soft tissue model is a gypsum model representing the initial soft tissue arrangement,

The image data representing the target soft tissue array is segmented into sections containing a portion of soft tissue corresponding to the individual teeth in the plaster model, and after the rearrangement of each segment in consideration of the occlusal relationship of the individual teeth, a three-dimensional scan is performed. Soft tissue array conversion method characterized in that the obtained.
The method of claim 1,

The step of obtaining the image data indicating the soft tissue array step by step further comprises the step of adjusting the soft tissue array step by step in consideration of the occlusal relationship, movement interference and biomechanical hazard of the teeth during movement.
The method of claim 1,

Obtaining image data representing the soft tissue array for each step of the movement,

Setting an arbitrary reference point coordinate in the image data for each intercept;

Extracting a path between the initial soft tissue array and the target soft tissue array using the reference point coordinates;

And arranging the image data for each section so as to space the extracted path by a predetermined distance to obtain image data indicating the soft tissue array for each step.
The method of claim 10,

The reference point is set to three or more for each section, soft tissue array conversion method characterized in that it is set to the soft tissue contained in each section.
The method of claim 10,

Setting the reference point coordinates,

And matching reference image coordinates to the soft tissue of each segment in the matched image data, after matching the image data for each segment with the image data representing the initial soft tissue arrangement.
The method of claim 12,

The paths of the initial soft tissue array and the target soft tissue array are matched to the image data representing the target tooth array in which the reference point coordinates are set, and then the reference points for each segment of the initial soft tissue array and the target soft tissue array. Soft tissue array transformation method characterized in that extracted by using the coordinates.
The method of claim 1,

After obtaining the image data indicating the soft tissue array step by step for the partial movement, soft tissue array conversion method characterized in that it further comprises the step of producing a dental instrument for the step soft tissue array.
The method of claim 14,

The method for converting soft tissue array, characterized in that the dental instrument for the soft tissue array for each step is manufactured using RP.
The method of claim 14,

The dental instrument for the soft tissue array of the step is soft tissue array conversion method characterized in that the manufacturing via CAD / CAM using the image data representing the soft tissue array for each step.
The method according to any one of claims 14 to 16,

Dental instrument produced using the image representing the soft tissue arrangement step by step obtained by the soft tissue conversion method.