KR20110074186A - How to design a prosthesis - Google Patents

Abstract

The present disclosure relates to a method of designing a prosthesis using first image data containing information about an oral surface without an implant fixture and second image data containing information about an interior of an oral surface. Determining implant planning information for positioning of an implant fixture relative to the image data; And a second step of adding implant planning information to the first image data for the design of the prosthesis.

Software, Medical, Dental, Implant, Prosthetics, Plaster, Design, Drilling

Description

How to design a prosthesis {METHOD OF DESIGNING A DENTAL PROTHESIS}

The present disclosure relates to a method of designing a prosthesis as a whole, and more particularly, to a method of designing a prosthesis in which a prosthesis (eg, a crown) can be installed along with an implant fixture.

This section provides background information related to the present disclosure which is not necessarily prior art.

1 is a view showing an example of drilling for implant placement described in US Patent No. 5,320,529, the surgical guide 100 is located on the bone 110, with a guide hole 120, the bone 110 When the hole 140 is formed through the drill 130, the drill 130 is guided. Reference numeral 150 is a nerve within the bone 110. Care should be taken not to damage the nerves 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 is a sleeve inserted into the guide hole 120.

FIG. 2 is a view illustrating an example of implant planning, and shows a screen in which four implant fixture models 170A, 170B, 170C, and 170D are placed on a CT image.

3 is a view for explaining an example of a method for manufacturing a surgical guide from the implant planing described in International Publication No. WO95 / 28688, first, a medical imaging apparatus such as CT equipment or MRI equipment from the bone 110 Using the, the bone image 111 is acquired. The bone image 112 is an enlarged image of the bone image 111. Next, a functional element 121, such as a guide hole 120 (see FIG. 1), formed through the segmentation to form a guide image 101 along the cross-sectional shape of the bone image 112, and planed thereon; Functional Element). In this way, the information about the guide image 101 on which the functional element 121 is formed is transferred to a rapid prototyping (RP) device to manufacture a surgical guide 100 having a guide hole 120. However, in the case of this method, although the shape of bone and teeth is clearly known due to the characteristics of the CT image, it is difficult to reproduce the shape of the gum which is a soft tissue. In addition, since it is not easy to design a prosthesis requiring precision using only a CT image, in most cases, the prosthesis is designed after reproducing the oral cavity using a plaster model or a 3D scanner.

4 is a view for explaining another example of a method for manufacturing a surgical guide, unlike the method of Figure 3, the radiographic guide 200, which can be referred to as a preform (preform) of the surgical guide 100 implants Used for planning. The radiographic guide 200 is an object made of resin having a mouthpiece shape that fits snugly in the mouth of the patient, and the surgical guide 100 has a radio in which a guide hole 120 is formed, which is a functional element planned through implant planning. It may be understood as the graphic guide 200. The image or image data may be prepared by preparing a radiographic guide 200 that follows the shape of the patient's mouth prior to CT imaging, wearing the radiographic guide 200, and then CT imaging the patient's mouth. Only 200) can be obtained by CT imaging. Since the radiographic guide 200 determines the final shape of the surgical guide 100, it is designed in consideration of the position and the like where the implant is to be treated. However, when an inexperienced user designs the radiographic guide 200, if the radiographic guide 200 is incorrectly designed, there is a problem that the surgical guide 100 does not finally fit the patient's teeth. May occur.

FIG. 5 is a view illustrating an example of a method of manufacturing a prosthesis in the related art. When a implant fixture is implanted in a hole 140 shown in FIG. 1 and a period of time passes, a healing abutment 34 is removed. To expose the implant fixture 10 and insert an impression coping 35 therein. Next, the impression body 41 is obtained through the impression taking, and the implant analog 11 having the same shape as the implant fixture 10 is positioned through the impression coping 35. Next, the model 50 is made of plaster. In the model 50, the implant analog 11 corresponding to the actual implant fixture 10 is fixed. When the impression coping 35 is removed, the model 50 can be used to design the abutment or the prosthesis. have. Therefore, from the design of the prosthesis to the manufacture and implantation of the prosthesis, the implant planning using CT image, the dring reel using surgical guide, the placement of implant fixture, the making of gypsum model, the prosthesis using gypsum model with implant analog placed It can be seen that a lot of time is required to design.

6 is a view showing another example of a method for designing and manufacturing a prosthesis in the related art, in order to shorten the time required to design the prosthesis, after preparing the surgical guide 100, the surgical guide 100 How to design the prosthesis using the model (50) after mounting the implant analog (11), stacking the dam (12), making gums with rubber (13), squeezing plaster patterns to make the model (50). Is presented. The model 50 manufactured as described above may be implemented on the model 50 'without drilling the hole 140' corresponding to the hole 140 actually formed in the oral cavity on the patient. Thus, according to this method, after the implant planning and fabrication of the surgical guide, it is possible to design and manufacture the prosthesis before entering the drilling, the advantage that the prosthesis can be made immediately when the patient goes to the dentist for drilling There is this. This method can be said to design the prosthesis using information about the oral cavity before drilling and implant planning information. On the other hand, the method illustrated in FIG. 5 may be referred to as designing a 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 (According to one aspect of the present disclosure), the first image data includes information about the oral cavity surface without an implant fixture, and the first image data includes information about the interior of the oral cavity surface. A method of designing a prosthesis using two image data, comprising: a first step of determining implant planning information for positioning an implant fixture relative to second image data; In addition, a second step of adding implant planning information to the first image data to design the prosthesis is provided.

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

The present disclosure will now be described in detail with reference to the accompanying drawing (s).

FIG. 7 is a view illustrating an example of an implant, in which an implant is coupled to an implant fixture 10, a prosthesis 20, and an implant fixture 10 fixed to a bone to support the prosthesis 20. FIG. Abutment (30) is included. The abutment 30 is fixed to the implant fixture 10 by a screw 32 in a state in which the connecting portion 31 is inserted into the implant fixture 10.

8 and 9 illustrate an example of a method of designing a prosthesis according to the present disclosure, which first includes CT image data or CT image 70 containing information about the interior of the oral cavity surface, and an implant fixture 10; 5 and 7) generate image data or image 60 containing information about the oral cavity surface in the absence. The image 60 may be obtained by obtaining an impression through the impression taking of the oral cavity, then forming a model through a gypsum bone, CT scan or three-dimensional scan. It can also be obtained by scanning the oral cavity directly using a three-dimensional scanner.

Next, the implant planning information is determined through implant planning in the CT image 70 (see the left figure in FIGS. 2 and 9). In this process, an implant fixture model 170A or the like corresponding to the implant fixture 10 (see FIG. 7) is selected, 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 is done on a computer (see the middle figure in FIG. 9) or from the image 60 to which implant planning information is added to form a model 50 in which holes 140 ′ are formed using RP equipment. (See the right figure in Fig. 9). In this case, it is preferable to associate the two images 60 and 70 in order to accurately position the implant planning information determined for the CT image 70 with respect to the image 60. The design process is a process of inserting an implant analog into the hole 140 ', and then manufacturing the abutment and / or prosthesis in accordance with the oral cavity and the implant analog.

FIG. 10 is a view for explaining an example of a method of associating two images, in which a CT image 70 and an image 60 are shown to the left and right, and the regions A and B of the CT image 70 and the image ( By surface based registration of the corresponding regions A ', B' of 60, the two images 60, 70 can be associated. Registration is a process of associating two images or volume data with each other, and can be understood as a process of finding a transformation matrix for associating two images having respective coordinate systems. Such registration is a process 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, a point registration is possible when a CT image is taken while a vacuum form in which a marker is inserted is provided in a plaster model and a patient, respectively. In FIG. 10, CT image 70 is an image taken by specifying the intensity of bone in CT image data or CT image 70, and both images 60, 70 have both teeth for convenience of registration description. The mouth of the patient was used.

As shown in Figure 1, in the case of using the surgical guide 100 in the formation of the hole 140, using the two images (60, 70) according to the present disclosure to design and manufacture the surgical guide as follows can do.

11 and 12 illustrate an example of a method of designing a surgical guide according to the present disclosure, which first extracts a surface 61 from an image 60. Surface 61 corresponds to the surface where conventional radiographic guide 200 (see FIG. 4) contacts the 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. Surgical guide model 62 corresponds to conventional radiographic guide 200.

Next, using the CT image 70 and the surgical guide model 62, 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 used. By designing and implanting in the surgical guide model 62, the design of the surgical guide model 62 with the functional element 63 is completed. Reference numeral 64 is a guide hole of a screw or pin used to secure the surgical guide produced through the RP to the oral cavity.

13 is a diagram illustrating 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 including information on the surface of the oral cavity prior to surgery, or to manufacture an actual model therefrom. Hereinafter, a method of forming an oral model including the lower part of the tooth, that is, the root, will be described as an example.

In the case of the image 60, only information on the oral cavity surface is represented, and information on the oral cavity surface is not represented. On the other hand, in the case of the CT image 70, it does not accurately reflect the information on the soft tissue, but can also represent information about the bone inside the oral cavity surface. Therefore, the information about the tooth part 91 covered by the gum from the CT image 70 is obtained, and the information about the tooth part 92 exposed to the outside of the gum from the image 60 is obtained so that the teeth 93 having combined them are obtained. When formed and represented with the image 60, an oral model 94 representing both the oral cavity surface and the interior of the oral cavity surface can be obtained. Furthermore, using the proper volume rendering technique for the oral model 94, the teeth 93 can be expressed in a color different from other parts, and the RP equipment can be used to make the teeth 93 different from the gums. do.

14 is a view illustrating an example of a method of joining teeth according to the present disclosure, and forms a boundary line 96 that distinguishes the tooth portion 92 from the gum 95 on the image 60. The relationship between two images 60,70 having different coordinate systems ([a, b, c], [d, e, f]) is known as a linear transformation (T) through registration, so the boundary line on the image 60 If 96 is formed, the boundary line 96 can be applied also to the tooth part 91. Therefore, through the necessary volume rendering, it is possible to represent the tooth 93 as a volume, it is possible to express it with the image 60 or CT image 70, combined to reproduce through the RP equipment It becomes possible.

FIG. 15 is a view showing another example of a method for forming an oral model according to the present disclosure. In addition to the teeth 93 and the gums 95, the bones 110 are orally modeled together, and the actual manufactured model is Is shown. In the actual manufactured model, the teeth 93 and the bones 110 may be integrated or separated. Through such a model, the actual reproduction of the gum 95, the reproduction of the teeth 93, and the accurate reproduction of the maxillary / mandibular bone 110 can be made and visualized. This oral model can be obtained by taking the bone 110 and the tooth portion 91 by taking the intensity value corresponding to the bone and adding the tooth portion 92 to it. It may also be obtained by taking the bone 110 separately and adding the teeth 93. The information of the gum 95 may be obtained by removing the volume corresponding to the bone 110 obtained from the CT image data or the image 70 from the image data or the image 60.

Various embodiments of the present disclosure will be described below.

(1) prior to the second step, associating the first image data with the second image data.

(2) A method for designing a prosthesis, wherein the implant planning information includes at least one of the position information of the implant fixture and the position information of the hole for the implant fixture.

(3) designing the prosthesis, wherein the implant planning information includes position information of the hole for the implant fixture, and prior to the second step, forming a surgical guide model for drilling of the hole for the implant fixture; How to.

(4) A method for designing a prosthesis, wherein implant planning information is added to the first image data in a state in which the first image data and the second image data are associated with each other.

(5) A method of designing a prosthesis, wherein the first image data is obtained from a model containing information about the oral cavity surface.

(6) A method for designing a prosthesis, wherein the first image data is obtained by scanning the oral cavity surface.

(7) A method for designing a prosthesis, wherein second image data is obtained by CT imaging.

(8) a third step of designing the prosthesis using the first image data to which the implant planning information is added.

And (9) a third step of designing the prosthesis using the first image data to which the implant planning information has been added.

According to the method of designing one prosthesis according to the present disclosure, it is possible to design the prosthesis by using information about the oral cavity before drilling.

According to another method of designing a prosthesis according to the present disclosure, it is possible to install a prosthesis with the placement of an implant fixture.

According to another method of designing a prosthesis according to the present disclosure, by forming an oral model using information about the oral cavity prior to drilling, a three-dimensional implant fixture model is placed directly on the oral model on a computer to directly abutment. And / or design a prosthesis, or build an actual model with RP equipment based on this oral model to design the abutment and / or prosthesis on this real model.

1 is a view showing an example of drilling for implant placement described in US 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 the implant planing described in International Publication No. WO95 / 28688,

4 is a view for explaining another example of a method for manufacturing a surgical guide,

5 is a view showing an example of a method for manufacturing a prosthesis in the related art;

6 is a view showing another example of a conventional method for designing and manufacturing a prosthesis,

7 is a view showing an example of an implant,

8 and 9 illustrate an example of a method of designing a prosthesis according to the present disclosure;

10 is a diagram for explaining an example of a method of associating two images;

11 and 12 are views illustrating an example of a method for designing a surgical guide according to the present disclosure,

13 illustrates an example of a method of forming an oral model according to the present disclosure;

14 is a view illustrating an example of a method of joining teeth according to the present disclosure;

15 illustrates another example of a method of forming an oral model in accordance with the present disclosure.

Claims (10)

In the method of designing a prosthesis using first image data containing information about the oral cavity surface without the implant fixture, and second image data containing information about the inside of the oral cavity surface, Determining implant planning information for positioning an implant fixture relative to the second image data; And, And a second step of adding implant planning information to the first image data for the design of the prosthesis. The method according to claim 1, Prior to the second step, associating the first image data with the second image data; method of designing a prosthesis. The method according to claim 1, The implant planning information comprises at least one of the position information of the implant fixture and the position information of the hole for the implant fixture. The method according to claim 1, The implant planning information includes the position information of the hole for the implant fixture, Prior to the second step, the method of designing a prosthesis, comprising the step of forming a surgical guide model for drilling the hole for the implant fixture. The method of claim 3, The implant planning information is added to the first image data with the first image data and the second image data associated with each other. The method according to claim 5, And wherein the first image data is obtained from a model containing information about the oral cavity surface. The method according to claim 5, And the first image data is obtained by scanning the oral cavity surface. The method according to claim 5, And the second image data is obtained by CT imaging. The method according to claim 1, And a third step of designing the prosthesis using the first image data to which the implant planning information is added. The method according to claim 5, And a third step of designing the prosthesis using the first image data to which the implant planning information is added.

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