KR20140096013A - Method of making a oral cavity model - Google Patents

Abstract

The present invention relates to a method of forming an oral cavity model which is characterized by comprising a first step of generating a first image data including information of the oral surface and a second image data including information of the inside of the oral surface; and a second step forming an oral cavity model combined with the information of the inside of the oral surface of the second image data based on the first image data.

Description

METHOD OF MAKING A ORAL CAVITY MODEL < RTI ID = 0.0 >

Disclosure relates generally to a method of forming an oral model, and more particularly to a method of forming an oral model to create one oral model using two images.

Herein, the background art relating to the present disclosure is provided, and these are not necessarily meant to be known arts.

FIG. 1 shows an example of drilling for implant placement described in U.S. Patent No. 5,320,529, wherein a surgical guide 100 is placed on a bone 110 and has a guide hole 120, Guides the drill 130 when forming the hole 140 through the drill 130. Reference numeral 150 is a nerve within the bone 110. Care must be taken to prevent damage to the nerve 150 within the bone 110 when planning the hole 140 to be formed in the bone 110 and / or when manufacturing the surgical guide 100. Reference numeral 160 denotes a sleeve inserted into the guide hole 120.

FIG. 2 is a view for explaining an example of implant planing, in which four implant fixture models 170A, 170B, 170C and 170D are placed on a CT image.

FIG. 3 is a view for explaining an example of a method for manufacturing a surgical guide from implant planning described in International Publication No. WO95 / 28688. First, a medical imaging apparatus such as a CT apparatus or an MRI apparatus, The bone image 111 is acquired. Bone image 112 is an enlarged image of bone image 111. Next, a functional element 121, such as a guide hole 120 (see FIG. 1), which is formed here and forms a guide image 101 along the cross-sectional shape of the bone image 112 through segmentation; Functional Element). Information about the guide image 101 in which the functional elements 121 are formed is transferred to a rapid prototyping device to manufacture a surgical guide 100 having a guide hole 120. However, in the case of this method, although the shape of the bone and the teeth can be clearly known due to the nature of the CT image, it is difficult to reproduce the shape of the gum, which is a soft tissue. In addition, since it is difficult to design a prosthesis requiring precision only by using a CT image, in most cases, a prosthesis is designed after reconstructing the oral cavity using a plaster model or a three-dimensional scanner.

4 is a view for explaining another example of a method for manufacturing a surgical guide. Unlike the method of FIG. 3, a radio graphic guide 200, which can be a preform of the surgical guide 100, It is used for planning. The radio graphic guide 200 is an object made of a resin having a mouthpiece shape that fits in the oral cavity of the patient and the surgical guide 100 includes a guide hole 120, And can be understood as a graphic guide 200. Such image or image data may be obtained by preparing a radio graphic guide 200 following the shape of the patient's mouth prior to CT imaging, CT of the patient's mouth after wearing the radio graphic guide 200, 200) can be obtained. Since the radio graphic guide 200 determines the final shape of the surgical guide 100, the implant is designed in consideration of the position to be performed. However, if a less-experienced user designs the radio graphic guide 200, if the radio graphic guide 200 is erroneously designed, the problem that the surgical guide 100 is not finally inserted into the patient's teeth Lt; / RTI >

5 is a view showing an example of a method of manufacturing a prosthesis according to the related art. After a certain period of time the implant fixture is placed in the hole 140 shown in FIG. 1, the healing abutment 34 is removed To expose the implant fixture 10, and insert an impression coping 35 thereon. Next, the impression body 41 is obtained through impression taking, and the implant analog 11 (Implant Analog) having the same shape as that of the implant fixture 10 is placed there through the impression coping 35. Next, the model 50 is formed using the gypsum. The implant model 11 corresponding to the actual implant fixture 10 is fixed to the model 50 and the model 50 can be used to design the abutment and to design the prosthesis by removing the impression copings 35 have. Therefore, from the planning of implant prosthesis to the preparation and implantation of prosthesis, implant planning using CT image, implantation of implant fixture with implant guide using surgical guide, preparation of gypsum model, design of prosthesis using gypsum model with implant analogue It can be seen that a lot of time is needed.

6 is a diagram showing another example of a method of designing and manufacturing a prosthesis. In order to shorten the time required for designing the prosthesis, a surgical guide 100 is prepared, A method of designing a prosthesis using a model 50 by mounting an implant analog 11 on a dental prosthesis 12, building a dam 12, making a gum with a rubber 13, . The model 50 thus produced can be implemented on the model 50 'without drilling the hole 140' corresponding to the hole 140 actually formed in the mouth in the actual patient. Therefore, according to this method, it becomes possible to design and manufacture the prosthesis before the implanting planning and the operation guide, and before the drilling, and when the patient goes to the dentistry for the drilling and performs the operation, . This method is to design the prosthesis using the information about the oral cavity before the drilling and the implant planning information. On the other hand, the method shown in FIG. 5 can be said to design the prosthesis using information about the oral cavity after drilling through implant planning.

This will be described later in the Specification for Implementation of the Invention.

SUMMARY OF THE INVENTION Herein, a general summary of the present disclosure is provided, which should not be construed as limiting the scope of the present disclosure. of its features).

According to one aspect of the present disclosure, there is provided an apparatus for generating first image data containing information about the oral cavity surface and second image data containing information about the inside of the oral cavity surface, Stage 1; And a second step of forming an oral cavity model in which information on the inside of the oral cavity surface of the second image data is combined based on the first image data.

This will be described later in the Specification for Implementation of the Invention.

1 is a view showing an example of drilling for implant placement described in U.S. Patent No. 5,320,529,
2 is a view for explaining an example of implant planning,
3 is a view for explaining an example of a method for manufacturing a surgical guide from implant planning described in International Publication No. WO95 / 28688,
4 is a view for explaining another example of a method of manufacturing a surgical guide,
5 is a view showing an example of a conventional method of manufacturing a prosthesis,
6 is a view showing another example of a method for designing and manufacturing a prosthesis in the related art,
7 is a view showing an example of an implant,
Figures 8 and 9 are diagrams illustrating an example of a method of designing a prosthesis in accordance with the present disclosure;
10 is a diagram illustrating an example of a method of associating two images,
Figures 11 and 12 are diagrams illustrating an example of a method of designing a surgical guide according to the present disclosure,
13 is a diagram illustrating an example of a method of forming an oral model in accordance with the present disclosure,
14 is a view for explaining an example of a method of bonding teeth according to the present disclosure,
Figure 15 illustrates another example of a method of forming an oral model in accordance with the present disclosure;

The present disclosure will now be described in detail with reference to the accompanying drawings.

7 shows an example of an implant. The implant includes an implant fixture 10, a prosthesis 20, and an implant fixture 10, which are fixed to the bone. And includes a buttment 30 (Abutment). The abutment 30 is fixed to the implant fixture 10 by a screw 32 in a state where the connecting portion 31 is inserted into the implant fixture 10. [

Figs. 8 and 9 are views showing an example of a method of designing a prosthesis according to the present disclosure. First, CT image data or a CT image 70 containing information on the inside of the oral cavity surface and an implant fixture 10 5 and Fig. 7) of the oral cavity surface is not placed. The image 60 can be obtained by obtaining an impression through an impression of an oral cavity, forming a model through a gypsum pattern, and then performing a CT scan or a three-dimensional scan. It can also be obtained by scanning the mouth directly with a 3D scanner.

Next, the implant planning information is determined through implant planning in the CT image 70 (see the left-hand side in Figs. 2 and 9). In this process, the implant fixture model 170A or the like corresponding to the implant fixture 10 (see FIG. 7) is selected and positioned, and the width and depth of the hole for placement of the implant fixture 10 are determined.

Next, the determined implant planning information is added to the image (60). The design of the prosthesis 20 may be performed on a computer (see the middle drawing in FIG. 9) or may be performed by forming a model 50 in which the hole 140 'is formed using the RP equipment from the image 60 to which the implant planning information has been added (See the right side of Fig. 9). At this time, it is preferable to associate the two images 60, 70 in order to accurately locate the implant planning information for the CT image 70 with respect to the image 60. [ The process of designing is to insert the implant analog into the hole 140 'and then fabricate the abutment and / or prosthesis according to the oral and implant analog.

10 illustrates an example of a method of associating two images, in which a CT image 70 and an image 60 are shown on the left and right, and the areas A and B of the CT image 70, The two images 60 and 70 can be associated with each other by surface registration of the corresponding areas A 'and B' of the images 60 and 60. Registration is a process of associating two images or volume data, which can be understood as a process of finding a transformation matrix associating two images having respective coordinate systems. Such registration is well known to those skilled in the art. In addition to using surface registration, it is also possible to use point based registration. For example, point registration is possible when a vacuum form with a marker inserted into a plaster model and a patient, respectively, is used and the CT image is used. 10, the CT image 70 is an image taken by specifying the intensities of the bones in the CT image data 70 or the CT image 70, and the two images 60 and 70 are all the teeth The patient's mouth was used.

1, when the surgical guide 100 is used to form the hole 140, the two images 60 and 70 according to the present disclosure are used to design and manufacture the surgical guide as follows. can do.

Figs. 11 and 12 illustrate an example of a method for designing a surgical guide according to the present disclosure. First, a surface 61 is extracted from an image 60. Fig. The surface 61 corresponds to a surface in which a conventional radio graphic guide 200 (see FIG. 4) contacts teeth and / or gums in the oral cavity.

Next, the surgical guide model 62 is formed by giving a volume based on the surface 61. The surgical guide model 62 corresponds to the conventional radio graphic guide 200.

Next, based on the determined implant planning information, a functional element such as a guide hole 120 (see FIG. 1) for drilling the hole 140 is formed by using the CT image 70 and the surgical guide model 62 The design of the surgical guide model 62 having the functional element 63 is completed by implanting the functional element 63 into the surgical guide model 62. Reference numeral 64 denotes a guide hole of a screw or a pin used for fixing the surgical guide prepared through the RP to the oral cavity.

13 is a view showing an example of a method of forming an oral model according to the present disclosure. According to the present disclosure, it is possible to form an oral model containing information inside the oral cavity surface prior to surgery, or to produce an actual model therefrom. Hereinafter, a method of forming an oral cavity model including a root of a tooth, that is, a root, will be described as an example.

In the case of the image 60, only the information of the oral surface is represented, and information inside the oral surface is not represented. On the other hand, in the case of the CT image 70, information about the soft tissues can not be accurately reflected, but information about bones inside the oral cavity surface can also be expressed. Therefore, information on the tooth portion 91 covered by the gum is obtained from the CT image 70, information on the tooth portion 92 exposed to the outside of the gum from the image 60 is obtained, And expressed with the image 60, an oral model 94 representing both the oral surface and the interior of the oral surface can be obtained. Furthermore, it is possible to use a suitable volume rendering technique for the mouth model 94, to express the tooth 93 in colors distinct from other parts, and to use the RP equipment to make the tooth 93 different from the gums do.

Figure 14 illustrates an example of a method of bonding teeth in accordance with the present disclosure, which forms a border line 96 that separates the tooth portion 92 and the gum 95 from the image 60. The relationship of the two images 60,70 having different coordinate systems ([a, b, c], [d, e, f]) is known as linear transformation T through registration, (96), the boundary line (96) is also applicable to the tooth portion (91). Thus, through the necessary volume rendering, it is possible to represent the tooth 93 as one volume, which can be represented together with the image 60 or CT image 70, and reproduced through the RP equipment It becomes possible.

15 shows another example of a method of forming an oral model according to the present disclosure wherein in addition to the teeth 93 and the gums 95 the bone 110 is modeled together with the oral cavity, Respectively. In the actual model, the teeth 93 and the bones 110 may be integrated or separated. With this model, it is possible to reproduce the actual representation of the gums 95, reproduce the teeth 93, and accurately reproduce the maxillary / mandibular bones 110 and visualize them. This oral model can be obtained by taking the bone 110 and the tooth part 91 by taking the intensity value corresponding to the bone and adding the tooth part 92 thereto. It may also be obtained by separately taking the bones 110 and adding teeth 93. The information of the gums 95 may be obtained by removing the CT image data from the image data 60 or the volume corresponding to the bones 110 obtained from the image 70. [ Also, in the case of using the oral model according to the present disclosure, in manufacturing the actual model, it is not necessary to fabricate the entire bone 110 with RP equipment, and only the region where the gum 95 of interest or the region where the tooth 93 exists So that it can be produced as an actual model.

Various embodiments of the present disclosure will be described below.

(1) Information on the oral cavity surface contains information about the exposed portion of the tooth outside of the gum. Information on the oral cavity surface contains information about the tooth covered by the gum. Wherein the tooth model comprises information about a combination of a tooth part covered by the gum and a tooth part covered by the gum.

(2) the second step includes the step of distinguishing between the gums and the teeth on the first image data.

(3) the second step comprises associating the first image data with the second image data.

(4) the first image data is obtained from a model containing information about the oral surface.

(5) the first image data is obtained by scanning the oral surface.

(6) A method for forming an oral cavity model, wherein second image data is obtained by CT imaging.

(7) A method of forming an oral model, wherein the first image data is obtained from a model containing information about the oral surface, and the second image data is obtained by CT imaging.

(8) The second step is to obtain information about the gums from the first image data, obtain information about the bones from the second image data, and then form an oral model.

(9) The method of forming an oral cavity model, wherein the oral model contains information on teeth obtained from the first image data.

(10) the second step comprises associating the first image data with the second image data.

(11) the second step obtains information about the gums from the first image data based on the information about the bones obtained in the second image data. The first image data is a mass with surface information of the gum. Removing the volume from the first image data to the bones obtained from the second image data enables to obtain not only the surface information of the gums but also the information on the boundary with the bones.

(12) a third step of specifying only the region of interest. With this configuration, only the gum, tooth, and / or bone region of interest can be specified and data can be obtained and the cost can be reduced by producing the data as an actual model.

(13) The oral cavity model is formed by combining the information about the inside of the oral cavity surface of the second image data and the information about the tooth part exposed to the outside of the gums obtained based on the first image data. Way. With this arrangement, it is possible to create an oral model with only bones and teeth, excluding the gums.

According to the method of forming an oral model according to the present disclosure, one oral model can be made using two images.

The method of forming the other oral model according to the present disclosure makes it possible to create an oral model that represents information on the oral surface and the inside of the surface.

According to the method of forming another oral cavity model according to the present disclosure, since only the region of interest can be modeled, the production cost can be reduced.

93 teeth

Claims (17)

A first step of generating first image data containing information on the oral cavity surface and second image data containing information on the inside of the oral cavity surface; And,
And a second step of forming an oral cavity model in which information on the inside of the oral cavity surface of the second image data is combined based on the first image data. The method according to claim 1,
Information about the oral surface contains information about the exposed teeth outside the gums,
Information about the internal surface of the mouth contains information about the teeth covered by the gums,
Wherein the oral model comprises information of a combination of a tooth portion exposed to the outside of the gum and a tooth portion covered by the gum. The method of claim 2,
Wherein the second step comprises the step of distinguishing between the gums and the teeth on the first image data. The method according to claim 1,
Wherein the second step comprises associating the first image data with the second image data. The method according to claim 1,
Wherein the first image data is obtained from a model containing information about the oral surface. The method according to claim 1,
Wherein the first image data is obtained by scanning the oral surface. The method according to claim 1,
And the second image data is obtained by CT photographing. The method of claim 4,
The first image data is obtained from a model containing information about the oral surface,
And the second image data is obtained by CT photographing. The method of claim 8,
Wherein the second step comprises the step of distinguishing between the gums and the teeth on the first image data. The method of claim 4,
The first image data is obtained by scanning the oral surface,
And the second image data is obtained by CT photographing. The method of claim 10,
Wherein the second step comprises the step of distinguishing between the gums and the teeth on the first image data. The method according to claim 1,
Wherein the second step is to obtain information about the gums from the first image data, obtain information about the bones from the second image data, and then form an oral model. The method of claim 12,
Wherein the oral model contains information about teeth obtained from the first image data. ≪ RTI ID = 0.0 > 11. < / RTI > 14. The method of claim 13,
Wherein the second step comprises associating the first image data with the second image data. 14. The method of claim 13,
Wherein the second step is to obtain information about the gums from the first image data based on the information about the bones obtained in the second image data. The method according to claim 1,
And a third step of specifying only the region of interest. The method according to claim 1,
Wherein the oral cavity model is formed by combining information on the inside of the oral cavity surface of the second image data and information on a tooth part exposed to the outside of the gum obtained based on the first image data.

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