KR20190013216A - Method for manufacturing complete denture for edentulous patients - Google Patents

Abstract

A method of manufacturing a complete denture based on a head 3D image of an edentulous patient is provided. The method of manufacturing the complete denture includes the steps of capturing the cone beam CT with the patient holding the spacing member between the maxilla and mandible to obtain hard tissue and soft tissue images of the patient's head and defining the occlusal plane and the midline on the 3D image, So that a complete denture can be designed. According to the present invention, it is possible to predict visually, to simplify the treatment process, and to improve the predictability of the treatment result.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a complete denture for edentulous patients,

The present invention relates to a method of manufacturing a complete denture for edentulous patients, and more particularly, to a method of manufacturing a complete denture for a edentulous patient, The present invention relates to a method for manufacturing a complete denture having high durability.

Making complete dentures for edentulous patients is a very difficult treatment compared to partial dentures. In the case of partial dentures, there is a residual tooth. Therefore, the denture can be made on the portion without a tooth based on this. However, since the complete denture has no standard tooth, the position of the occlusal plane relative to the facial, Relationship, and soft tissue appearance in the oral cavity.

Currently, most dental hospitals are producing complete dentures (total dentures) through preliminary impression preparation, functional impression preparation, chin relation acquisition, lead dentition and completion stages. Specifically, when a patient visits, the dentist examines and diagnoses whether the patient's denture or gingiva is suitable for supporting the denture, whether there is an intraoral structure that interferes with denture making, and the like. If there is no abnormality, preliminary impression is made using the ready tray. We construct a research model using preliminary impression, and design a personalized tray to accurately express the patient 's oral condition using the research model. Next, a function tray (or a precise tray tray) is used to obtain a function increase (or a precise increase). Using the functional impression, the main model is made and the upper and lower jaw relations are made by making the recording image and the occlusion agent on the main model. Arrangement of artificial teeth in the occlusion agent is performed to demonstrate the value of lead, and finally the total denture is completed.

Such a conventional method of preparing a complete denture requires an average of 3 to 5 months, and it is inconvenient to visit the denture at least five times in order to visit the denture. This manufacturing process depends on the experience and skill of the dentist and it is very difficult to predict the outcome of the treatment. In addition, in order to produce a complete denture suitable for a patient, it is necessary to reflect the whole patient information of the patient's face, head and neck, upper and lower mandible.

It is an object of the present invention to provide a method of manufacturing a complete denture that can reduce the number of times of patient visits and the duration of treatment to provide convenience and provide an accurate denture based on anatomical information of a patient.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a method of manufacturing a complete denture for an edentulous patient, comprising the steps of: Generating an image; Displaying a soft tissue image and a hard tissue image from the 3D image on a screen; Setting a reference line connecting the soft tissue image displayed on the screen and the anatomical landmark of the patient on the hard tissue image; Setting an occlusal plane and a midline on the 3D image with reference to the reference line; Designing recording, occlusal or artificial teeth between the maxilla and mandible on the 3D image with reference to the occlusal plane and the midline; And outputting the three-dimensional structure according to the design file of the recording image, the occlusion agent, or the artificial teeth.

The spacing member can separate the upper and lower soft tissues in the oral cavity of the patient and determine the occlusal height and horizontal relationship between the upper and lower mandible through height adjustment.

The spacing member may include a top end stop tray, a mandibular tray, and a connecting member for adjusting a distance between the trays.

The reference line may be a midline, a pupil trunk, or a Camper's plane.

And displaying the simulated face change of the patient on the screen according to the position of the artificial tooth in the oral cavity.

The details of other embodiments are included in the detailed description and drawings.

As described above, according to the method of manufacturing a complete denture according to the present invention, the patient can visit only three times at least, thereby significantly reducing the inconvenience of dentures. That is, if a tomographic image is taken and an occlusion agent or an occlusal prosthesis is obtained through the occlusion or denture, the patient can visit the hospital to finally mount the denture. In addition, since most of the production process is modeled on 3D images, the treatment period can be shortened. In some cases, it may be possible to omit the poetic and discontinuity phases.

In addition, a correct denture can be designed because a complete denture is manufactured using tomography, for example, cone beam CT using oral and external anatomical information.

FIG. 1 is a flowchart sequentially illustrating a method of manufacturing a complete denture according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view schematically showing the spacer in Fig. 1. Fig.
Figs. 3 to 5 are views showing exemplary reference line setting of Fig.
FIG. 6 is a view illustrating a process of determining the position of an artificial tooth in FIG.
Figure 7 illustrates an exemplary occlusion agent output in Figure 1;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

A complete denture design system according to an embodiment of the present invention is a system for providing a complete denture using a 3D image of a head of an edentulous patient. The system includes an imaging device for photographing a head of a patient, And a 3D output device for producing a structure necessary for complete denture based on the final design file from the designing device.

The imaging device is a device for generating a 3D image of a patient's head, specifically the internal and external soft tissues of the patient, the teeth, and the facial bone structure using tomography. The imaging device may be configured with, for example, Cone Beam Computerized Tomography (CT). The cone beam CT detects the cone-shaped transmission X-ray two-dimensionally using an area detector and obtains the three-dimensional volume information by using it to generate a 3D image by only one rotation scan of the object. Cone beam CT is a device that accurately generates hard tissue images of the head, such as the maxilla, mandible, ridge, alveolar bone, and root. However, it can also generate soft tissue images of the contour of the patient's face. Further, when the patient is taking a cone beam CT in a state where the separation member is held between the upper and lower mandibles, the soft tissues can be accurately represented because the upper and lower soft tissues are separated from each other by the spacing member and the impression material contained therein.

The design apparatus receives a 3D image, i.e., a soft tissue image and a hard tissue image, from the imaging device and displays each or a combination thereof on the screen. Because the 3D image contains all of the patient's anatomical information to create a complete denture, the dentist can produce accurate, wear-friendly dentures based on this. The dentist connects to the design device through the user terminal and sets a reference line on the soft tissue image, hard tissue image, or a combined image thereof displayed on the screen. Here, the reference line is a reference line for the design of a complete denture, and includes a line on the face and head and neck, a camper's plane, a Frankfort horizontal plane, a pupil trunk, (Upper eyelid), upper eyelid (upper eyelid), upper eyelid, lower eyelid, or a combination thereof. The dentist can determine the position of the recording, occlusal or artificial teeth by checking the soft tissue images and hard tissue images based on these reference lines. The designing device can display simulation of the change of the face or facial according to the position change of the artificial tooth. Upon completion of the recording, the design of the occlusal agent or the artificial tooth, the designing device stores the image of the structure (recording image, occlusion agent, or artificial tooth) in a STL (STeroLithography) file format.

The 3D output device includes a milling machine, a 3D printer, and the like, which receives a design file from a designing device and manufactures a structure such as a recording material, an occlusion material, or an artificial tooth.

Hereinafter, a method of manufacturing a complete denture according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. FIG. FIG. 1 is a flowchart sequentially illustrating a method of manufacturing a complete denture according to an embodiment of the present invention. Fig. 2 is a cross-sectional view schematically showing the spacer in Fig. 1. Fig. Figs. 3 to 5 are illustrations showing the reference line setting of Fig. 1 by way of example. FIG. 6 is a view illustrating a process of determining the position of an artificial tooth in FIG. Figure 7 illustrates an exemplary occlusion agent output in Figure 1;

1 and 2, a separation member 10 is inserted between a maxilla 20 and a mandible 30 of a patient before performing a tomography of a 3D image of the patient's head using the imaging device (S10) . The spacing member 10 includes a top deformation tray 12, a mandible tray 14, and a connecting member 16 for adjusting the distance between these trays. The upper deformation tray 12 and the lower tray 14 each have a tray shape for pulling up and have an impression material for forming a pattern on the inside. Thus, the patient is gripping the spacing member 10 in the oral cavity. This impression material and spacing member 10 serve to more clearly reveal the intraoral soft tissue of the patient in subsequent tomography. The connecting member 16 is configured to adjust the distance between two trays by connecting the upper and lower tails 12 and 14 to each other. For example, the connecting member 16 may be provided with threads on the outer circumference thereof to adjust the tray interval by rotating movement. It is very important to determine the horizontal or vertical relationship between occlusal height or vertical height and malocclusion in an edentulous patient. In the present invention, before designing the complete shape of the complete denture, Is determined.

Next, a 3D image of the patient's head is generated using tomography of the imaging device (S20). The imaging device generates soft tissue images and hard tissue images as 3D images. Here, the soft tissue image includes the soft tissue image in the oral cavity as well as the facial appearance. Specifically, when the patient is taking the cone beam CT in a state wearing the spacing member 10 containing the impression material, the soft tissue image as well as the impression material and the soft tissue image separated by the spacing member 10 can be obtained as well as the hard tissue image . The method of obtaining the soft tissue image in the oral cavity is not limited to this, and the soft tissue image can be obtained by scanning the inside of the oral cavity by optical scanning or scanning the impression material with the soft tissue in the oral cavity.

The design apparatus displays a soft tissue image, a hard tissue image, or a combination thereof on the screen using the 3D image photographed from the imaging device (S30). Through this, the dentist can confirm the soft tissue, skull and mandible, and upper and lower jaw relationship of the patient's face.

The dentist accesses the design apparatus through the user terminal and sets a reference line on the 3D image displayed on the screen (S40). Herein, the reference line is information on the basis of the occlusal plane and the midline for making the complete denture, and refers to a line or a plane connecting the anatomical landmark. In the present invention, the reference line is referred to as a reference line for simplicity of the term, but it should be understood as a concept including a plane on a 3D image as well as a line connecting landmarks.

For a specific example of setting the reference line, FIG. 3 shows an example in which a pupil trunk line and a camper's plane are set as reference lines on a soft tissue image. Here, the camber plane means a plane connecting the apical portion of the nasal wing and the upper part of the tragus. In this example, the outline of the face is represented by a soft tissue image, but the intraoral soft tissue may be separately imaged.

FIG. 4 illustrates an example in which a soft tissue image and a hard tissue image are displayed together, and a pupil trunk line and a camper plane are set as reference lines. It can be confirmed that a part of the spacing member is displayed in the oral cavity.

5 shows an example in which a pupil trunk line and a camper plane are set as reference lines on a hard tissue image. In this example, part of the spacing member is also displayed in the mouth. In addition to these examples, the reference line includes the midline of the face and the head and neck, or the Frankfort Horizontal plane, and includes a wing (nostril), an ankle (anterior mouth), an ankle (a dorsal line) ), A line connecting the anatomical landmarks of the lower and upper mandibles (lower jaw), eyebrows, upper and lower lips, and the like. Here, the Frankfort horizontal plane refers to the horizontal plane determined by looking sideways between the lowest point of the orbital margin and the highest point of the ear canal edge.

An anatomical reference line or reference point plays a very important role in dental prosthetic treatment. A person's dentition is caused by many causes such as malocclusion, growth pattern, loss of teeth, movement of teeth due to tooth loss, congenital defect, remnant of toothpick, malpractice such as dry mouth, jaw face anomaly, jaw face defect, Have various arrangements. In the restoration or orthodontic treatment of teeth, a treatment plan is established considering these causes. If the tooth is partially defective, the treatment plan such as the length of teeth or occlusion can be made with reference to the remaining dental condition. However, in an edentulous patient with no teeth, the complete denture must be designed by relying on reference points or reference lines based on the soft tissue, skull, and mandible of the face.

Subsequently, an occlusal plane and a midline are set on the 3D image displayed on the screen with reference to the reference line (S50). The occlusal plane and midline are important factors in the complete denture design of edentulous patients, on which records, occlusal or artificial teeth are arranged. The occlusal plane refers to the horizontal virtual plane formed by the occlusal surface of the teeth as the entire dentition, preferably the occlusal plane is set substantially parallel to the pupil trunk line or camper plane. Especially, in edentulous patients, it is difficult to set the occlusal plane directly because there is no tooth at all, and it is inevitable to set it with the help of reference lines (pupil trunk line, camper plane, etc.). In addition, the midline is the line representing the center of the tooth, and is set to match the center of the head and neck because there is no standard tooth for the edentulous patient.

Next, a recording image, an occlusion agent, or an artificial tooth is designed between the upper and lower jaws based on the occlusal plane and the midline (S60). Since the 3D image of the present invention is photographed while the patient is holding the spacer member 10, the occlusion diameter has already been determined. Therefore, recording, occlusal, or artificial teeth can be designed while referring to the patient's soft and hard tissues based on the occlusal plane and the midline shown in the 3D image. 6, the position of the artificial tooth can be determined based on the occlusal plane, the midline, the reference line, etc. while referring to the soft tissue image and the hard tissue image of the patient's head, i.e., anatomical information. When the patient is taking a cone beam CT while the patient is holding the separation member 10, the dentist can determine the ratio of the face, the esthetics of the facial feature, the relation between the upper and lower mandible, the relation between the tongue and the ball in the mouth, The three-dimensional position of the artificial tooth can be arranged while checking the horizontal relation of the preparation. Therefore, clinical errors such as errors in the occlusal plane can be significantly reduced. In addition, since such 3D images and design data are transmitted to the technician, the possibility of failure of treatment due to communication difficulties between the dentist and the technician can be significantly reduced. Further, when the position of a structure (recording image, occlusion agent, or artificial tooth) is changed in the oral cavity on the 3D image, the result of the treatment can be easily predicted when the change of the patient's face is displayed on the screen by simulation. The images of these structures are stored as design files in the STL file format.

Then, the three-dimensional structure is output according to the design file of the recording material, the occlusion agent, or the artificial tooth using the 3D output device (S70). The above design file can have the STL file format, and can output a three-dimensional structure using a milling machine, a 3D printer, and the like. Referring to FIG. 7, the occlusal plane 52 and the midline 50 referenced in the previous design step are directly transferred to the occlusion agent 40 output as a three-dimensional structure, and are displayed and utilized in the tooth arrangement. In the present embodiment, the occlusion agent is output as a three-dimensional structure. However, the present invention is not limited thereto.

When the complete denture is manufactured through the above-described process, the patient can obtain the finished denture even if he visits only three times. At the first visit, the edentulous patient records the cone beam CT at the door, and the dentist uses the anatomical reference line from the photographed 3D image to output the recording, occlusal or artificial values. During the second visit, if the patient shows occlusal or dentures and the lungs are removed, the dentist will arrange the teeth to complete the dentures. At the third visit, the patient is finally fitted with a denture. Thus, the patient's convenience can be maximized by reducing the number of visits to the patient. In addition, it can contribute to increase productivity by lowering doctor's time and frequency of treatment. In some cases, it may be possible to omit the poetic and discontinuity phases.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10:
12: Container tray
14: Lower tray
16:
20: The maxilla
30: mandible
40: Occlusal
50: Midline
52: occlusal plane

Claims (5)

A method of manufacturing a complete denture for edentulous patients comprising:
Generating a 3D image of the head of the patient by tomography with the spacing member inserted between the upper and lower mandibles of the patient;
Displaying a soft tissue image and a hard tissue image from the 3D image on a screen;
Setting a reference line connecting the soft tissue image displayed on the screen and the anatomical landmark of the patient on the hard tissue image;
Setting an occlusal plane and a midline on the 3D image with reference to the reference line;
Designing recording, occlusal or artificial teeth between the maxilla and mandible on the 3D image with reference to the occlusal plane and the midline; And
And outputting the three-dimensional structure according to the design file of the recording, the occlusion, or the artificial teeth. The method according to claim 1,
Wherein the separating member separates the upper and lower soft tissues in the oral cavity of the patient and adjusts the height of the patient to determine the occlusal height and the horizontal relationship between the upper and lower mandibles. The method according to claim 1,
Wherein the spacing member comprises a top deformation tray, a mandible tray, and a connection member for adjusting the spacing between the trays. The method according to claim 1,
Wherein the reference line is a midline, a pupil trunk, or a camper's plane. The method according to claim 1,
Further comprising the step of displaying on the screen a simulated face change of the patient according to the position of the artificial tooth in the oral cavity.

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