KR102057671B1 - Method for manufacturing complete denture for edentulous patients - Google Patents

Abstract

A method of manufacturing a complete denture based on the head 3D image of an edentulous patient is provided. In this method of manufacturing the complete denture, the cone beam CT is taken while the patient is holding the spacer between the maxilla and the mandible to obtain an image of the hard and soft tissues of the patient's head. The complete denture can be designed. According to the present invention, it is possible to visually predict, to simplify the treatment process and to increase the predictability of the treatment result.

Description

Method for manufacturing complete denture for edentulous patients

The present invention relates to a method of manufacturing a complete denture for an edentulous patient, more specifically, by designing a complete denture based on the 3D image of the head of the patient is visually predictable, the treatment process is simple and the results of the treatment It relates to a method for producing a full denture with high predictability.

The production of complete dentures for edentulous patients is a more difficult treatment than partial dentures. In the case of partial dentures, there is a residual tooth, so the dentures can be made on the part without teeth. However, since the complete dentures do not have any reference teeth, the patient's face, position of occlusal plane with respect to the skull, and upper and lower jaw Several variables, including relationships, oral soft tissue appearance, should be considered.

At present, most dental hospitals are producing complete dentures (general dentures) through preliminary impressions, functional impressions, jaw relationship acquisition, lead denture poetic and completion stages. Specifically, when the patient visits the dentist, the dentist examines and diagnoses whether the patient's alveolar or gum is suitable for supporting the denture, and whether there is an intraoral structure that interferes with the denture production. If there is no abnormality, a preliminary impression is obtained by using a ready-made tray. The study model is made by using the preliminary impression, and the individual tray is designed to accurately represent the oral condition of the patient by using the study model. Subsequently, a functional impression (or a precision impression) is obtained by using a personal tray. Using the functional impression, the main model is made and the upper and lower jaw relations are obtained by making the record and the occlusal agent on the main model. The artificial dentures are arranged in the occlusal agent to try out the lead dentures, and finally the total dentures are completed.

The manufacturing process of the complete denture according to the prior art takes an average of 3 to 5 months, there is an inconvenience that you have to visit at least five times to visit in the above steps. This manufacturing process is very difficult to predict the treatment result depending only on the dentist's experience and skill. In addition, in order to produce a perfect denture fit to the patient to reflect the overall patient information of the patient's face, head and neck, maxilla and mandible, there is a problem difficult to accurately reflect this in the manufacturing process.

The problem to be solved by the present invention is to provide a method of manufacturing a complete denture that can be provided by reducing the number of visits and treatment period of the patient for convenience and to provide accurate dentures based on the anatomical information of the patient.

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

According to one or more embodiments of the present invention, a method of manufacturing a complete denture for an edentulous patient according to an embodiment of the present invention includes a 3D head of the patient's head by tomography in which a spacer is inserted between the patient's upper and lower jaw. Generating an image; Displaying a soft tissue image and a hard tissue image on the screen from the 3D image; Setting a reference line connecting the patient's anatomical landmarks on the soft tissue image and the hard tissue image displayed on the screen; Setting an occlusal plane and a midline on the 3D image based on the reference line; Designing a recording, occlusal or artificial tooth based on the occlusal plane and the midline between the maxillary and the mandibular on the 3D image; And outputting a three-dimensional structure according to the record, the design file of the articulator or the artificial tooth.

The spacer member may determine the occlusal diameter and the horizontal relationship between the maxilla and the mandible by separating the upper and lower soft tissues in the oral cavity of the patient and adjusting the height.

The spacer may include an upper tray, a lower tray, and a connection member for adjusting a gap between the trays.

The reference line may be a midline, an interspace line, or a camper's plane.

The method may further include displaying, on a screen, a simulation of the face change of the patient according to the position of the artificial tooth in the oral cavity.

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, since the patient needs to visit at least three times, the inconvenience caused by making the denture can be considerably reduced. In other words, tomography is performed, and when a pulmonary alveolar impression is obtained through an occlusal or denture podium, a visit to a hospital is finally required to install a denture. Also, since the manufacturing process is mostly modeled on 3D images, the treatment period can be shortened. In some cases, the poetic and pulmonary elevation steps may be omitted.

In addition, accurate dentures can be designed because complete dentures are produced using anatomical information inside and outside the oral cavity through tomography, such as cone beam CT.

1 is a flow chart sequentially showing a method of manufacturing a complete denture according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically illustrating the spacer in FIG. 1.
3 to 5 exemplarily illustrate reference line settings of FIG. 1.
6 is a view showing a process of determining the position of the artificial tooth in FIG.
FIG. 7 exemplarily shows the occlusal output from FIG. 1.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Complete denture design system according to an embodiment of the present invention is a system for providing a complete denture by using the 3D image of the head of the edentulous patient, an imaging device for photographing the head of the patient, and receiving the 3D image from the imaging device And a 3D output device for manufacturing the required structure of the complete denture based on the final design file from the design device.

The imaging apparatus is a device for generating 3D images of the head of the patient, specifically intraoral soft tissues, teeth, and facial bone structures using tomography. For example, the imaging apparatus may be configured as cone beam computerized tomography (CT). Conbeam CT detects two-dimensionally conical transmission X-rays using an area detector, and obtains three-dimensional volume information using the beam detector to generate a 3D image by only one rotational scan of a subject. Conbeam CT is a device that accurately generates hard tissue images of the head, such as maxillary, mandibular, alveolar, alveolar bone, and root, but can also generate soft tissue images of the appearance of the patient's face. Furthermore, when the patient is photographing the cone beam CT while holding the spacer between the maxilla and the mandible, the soft tissue in the oral cavity may be accurately represented because the upper and lower soft tissues are separated from each other by the spacer and the impression material contained therein.

The design apparatus receives 3D images, that is, soft tissue images and hard tissue images, from the imaging apparatus and displays each or a combination thereof on the screen. Because the 3D image contains all the anatomical information of the patient to produce the complete denture, the dentist can create an accurate and comfortable to wear denture. The dentist sets a reference line on the soft tissue image, hard tissue image, or a combination thereof displayed on the screen by accessing the design apparatus through the user terminal. Here, the reference line is a reference line for the design of the complete denture, the midline of the face and head and neck, the Camp's plane, the Frankfort horizontal plane, the cosmic line, the nose, the sphere Determination is made with reference to an angle (tail line), an angle (eye tail line), a perforation (ear hole), a mandibular lower part (lower jaw), an eyebrow, an upper lip, a lower lip, or a combination thereof. The dentist may determine the location of the occlusal, occlusal or artificial teeth while viewing soft and hard tissue images based on these reference lines. The design apparatus may display a simulation of a change in face or face according to a change in position of an artificial tooth on a screen. When the design of the record, the occlusal or artificial teeth is completed, the design apparatus stores the design file in the STL (STeroLithography) file format of the image of the structure (recorded, occlusal or artificial teeth).

The 3D output device is a device for receiving a design file from a design device and manufacturing a structure such as an image, an occlusal agent or an artificial tooth, and includes a milling machine, a 3D printer, and the like.

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. 1 is a flow chart sequentially showing a method of manufacturing a complete denture according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically illustrating the spacer in FIG. 1. 3 to 5 are views illustrating exemplary reference line settings of FIG. 1. 6 is a view showing a process of determining the position of the artificial tooth in FIG. FIG. 7 exemplarily shows the occlusal output from FIG. 1.

1 and 2, before the tomography of the 3D image of the head of the patient using the imaging device, the spacer 10 is inserted between the upper jaw 20 and the lower jaw 30 of the patient (S10). . The spacer 10 includes a maxillary tray 12, a mandibular tray 14, and a connection member 16 for adjusting a gap between the trays. The upper tray 12 and the lower tray 14 each have a tray shape for taking impressions and are provided with an impression material for making a pattern therein. Thus, the patient is biting the spacer 10 in the oral cavity. The impression material and the spacer 10 serve to more clearly reveal the soft tissue in the oral cavity of the patient in subsequent tomography. The connecting member 16 is configured to connect the upper tray 12 and the lower tray 14 to adjust the distance between the two trays. For example, the outer periphery may include a screw thread to adjust the tray gap by rotational movement. It is very important to determine the horizontal relationship between the occlusal or vertical diameter and the upper and lower jaw in the edentulous patients, in the present invention, before designing the specific shape of the complete denture, the horizontal relationship between the occlusal and upper and lower jaw of the patient using the connecting member 16 Characterized in determining.

Subsequently, 3D images of the head of the patient are generated using tomography of the imaging apparatus (S20). The imaging device generates soft tissue images and hard tissue images as 3D images. Herein, the soft tissue image includes not only the facial appearance but also the soft tissue image in the oral cavity. Specifically, when the patient is photographing the cone beam CT while wearing the spacer 10 containing the impression material, the hard tissue image as well as the soft tissue image separated by the impression material and the spacer 10 can be obtained basically. . The method of obtaining the soft tissue image in the oral cavity is not limited thereto, and the soft tissue image may be obtained by optically scanning the intraoral cavity or by scanning or photographing an impression material that mimics the shape of the soft tissue in the oral cavity with an imaging device.

The design apparatus displays the soft tissue image, the hard tissue image, or a combination thereof on the screen using the 3D image photographed from the imaging apparatus (S30). This allows the dentist to check the soft tissue, skull and mandible, and upper and lower jaw relationships on the patient's face.

The dentist sets the reference line on the 3D image displayed on the screen by accessing the design apparatus through the user terminal (S40). Here, the reference line is information that is the basis of the occlusal plane and the midline for manufacturing the complete denture, and means a line or plane connecting anatomical landmarks. In the present invention, a reference line is named for the convenience of terms, but it should be understood as a concept including a plane on a 3D image as well as a line connecting landmarks.

For example, referring to a reference line setting, FIG. 3 illustrates a case where a co-space line and a Camper's plane are set as reference lines on a soft tissue image. Here, a camper plane means the plane which connects the non-wing part and the upper edge of a migration | transition. In this example, although the appearance of the face is displayed as an image of the soft tissue, the soft tissue in the oral cavity may be separately imaged.

4 illustrates an example in which a co-space line and a camper plane are set as reference lines after displaying a soft tissue image and a hard tissue image together. It can be seen that a part of the spacer is displayed in the oral cavity.

5 illustrates an example in which a co-space line and a camper plane are set as reference lines on a hard tissue image. In this example, a part of the spacer is displayed in the oral cavity. In addition to these examples, the reference line includes the midline of the face and head and neck, or the Frankfort Horizontal plane, and includes the nose, the nose, the angle of mouth, the angle of the eye, and the perforation. ), Lower mandibular lower jaw (lower jaw), eyebrow, upper lip, lower lip and may be composed of lines connecting anatomical landmarks. Here, the horizontal plane of Frankfurt refers to a horizontal plane determined by looking sideways between the lowest point of Anwayeon and the highest point of Lee Doyeon.

Anatomical reference lines or reference points play a very important role in dental prosthetics. A person's dentition may be caused by numerous causes such as malocclusion, growth, tooth loss, tooth movement due to tooth loss, congenital defects, residual maturity of teeth, bad habits such as bruising, jaw face deformity, jaw face defect, and jaw joint disease. It has a variety of arrays. In the restoration or orthodontic treatment of the teeth, the treatment plan should be taken into account. If the tooth is partially missing, a treatment plan, such as tooth length or occlusion formation, can be made with reference to the remaining dentition. However, in the case of an edentulous patient without any teeth, the complete dentures have no choice but to rely on reference points or reference lines based on the soft tissue of the face, the skull, and the mandible.

Subsequently, the occlusal plane and the midline are set on the 3D image displayed on the screen based on the reference line (S50). Occlusal planes and midline are important factors in the design of complete dentures in edentulous patients, based on which the occlusal or artificial teeth are arranged. The occlusal plane refers to a horizontal virtual plane formed by the occlusal surface of the tooth as an orthodontic body. Preferably, the occlusal plane is set to be substantially parallel to the coplanar line or the camper plane. In particular, in the case of edentulous patients, since there is no tooth at all, it is difficult to set the occlusal plane directly, and it is inevitable to set it with the help of reference lines (cavity lines, camper planes, etc.). In addition, the midline is a line representing the center of the tooth and is set so as to coincide with the center of the head and neck because there is no reference tooth in the edentulous patient.

Subsequently, a recording, occlusal or artificial tooth is designed between the maxilla and the mandible based on the occlusal plane and the midline (S60). Since the 3D image of the present invention is photographed while the patient is biting the spacer 10, the occlusal diameter is already determined. Therefore, on the basis of the occlusal plane and the midline displayed in the 3D image, the patient's soft tissue and hard tissue may be referred to, and the record, articulator, or artificial tooth may be designed. For example, as shown in FIG. 6, the position of the artificial tooth may 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, ie, anatomical information. In this case, when the patient is taking a cone beam CT while holding the spacer 10, the dentist uses a 3D image to determine the ratio of the face, facial aesthetics, upper and lower jaw relationship, intraoral tongue and cheek relationship, and upper and lower jaw. The three-dimensional position of the artificial teeth can be arranged while checking the horizontal relationship of the preparations. Thus, clinical errors such as occlusal errors can be significantly reduced. In addition, since these 3D images and design data are transmitted to technicians as they are, the possibility of treatment failure due to communication disorder between dentist and technicians can be significantly reduced. Furthermore, when the position of the structure (recorded, occlusal or artificial teeth) is changed in the oral cavity on the 3D image, when the change of the patient's face is displayed on the screen by simulation, the treatment result can be easily predicted. Images of these structures are saved as design files in STL file format.

Subsequently, the 3D structure is output using the 3D output apparatus according to the design file of the recording image, the occlusal agent or the artificial tooth (S70). The design file may have an STL file format and may output a 3D structure using a milling machine, a 3D printer, or the like. Referring to FIG. 7, the occlusal plane 52 and the midline 50 referred to in the previous design step are transferred and displayed on the occlusal agent 40 output as a three-dimensional structure to be utilized for the tooth arrangement. In this embodiment, the output of the occlusal agent as a three-dimensional structure has been described as an example. However, the present invention is not limited thereto, and an artificial tooth or a complete denture, which is a recording or a final result, may be output.

In the case of producing a complete denture through the above process, the patient can obtain a complete denture even if the patient visits at least three times. After the edentulous patient photographs the cone beam CT at the first visit, the dentist uses an anatomical reference line from the photographed 3D image to output a record, articulator or artificial tooth. At the second visit, the occlusal or denture is tried on the patient and a pulmonary impression is obtained. The dentist arranges the teeth to complete the denture. At the third visit, the patient is finally fitted with dentures. In this way, the patient's convenience can be maximized by reducing the number of visits. It can also contribute to increasing productivity by lowering doctors' time and treatment. In some cases, the poetic and pulmonary elevation steps may be omitted.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

10: spacer
12: Maxillary Tray
14: mandibular tray
16: connecting member
20: maxilla
30: mandible
40: binder
50: midline
52: occlusal plane

Claims (5)

As a method for manufacturing dentures in edentulous patients:
The 3D image of the patient's soft tissue image and the patient's hard tissue image are obtained from the 3D image by using the 3D image of the head of the patient generated by tomography by an imaging device with a spacer inserted between the patient's upper and lower jaw. Displaying on the screen (the soft tissue image includes a facial appearance image and an intraoral soft tissue image, wherein the facial appearance image and the oral soft tissue image are simultaneously generated by tomography without a separate alignment process);
Defining an anatomical landmark of the patient based on the soft tissue image and the hard tissue image displayed on the screen and setting a reference line connecting the landmarks;
Setting an occlusal plane and a midline on the 3D image based on the reference line;
Designing a record, occlusal or artificial tooth based on the occlusal plane and the midline between the maxillary and the mandibular on the 3D image; And
And outputting a three-dimensional structure in accordance with the recording file of the articulator or the artificial tooth on the recording. The method of claim 1,
The spacer member is a method of manufacturing a complete denture, characterized in that to determine the occlusal diameter and the horizontal relationship between the upper and lower jaw by separating the upper and lower soft tissue in the oral cavity of the patient and height adjustment. The method of claim 1,
The spacer member manufacturing method of the complete denture including the upper tray, the lower tray, and the connecting member for adjusting the gap between the trays. The method of claim 1,
The reference line is a midline, a cosmic line, or a camper's plane (Camper's plane) characterized in that the manufacturing method of the complete denture. The method of claim 1,
And displaying a simulation of the face change of the patient according to the position of the artificial tooth in the oral cavity on a screen.

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