KR102239741B1 - Scanmarker for facebow, and method of facebow transfer to virtual articulator - Google Patents

Abstract

The present invention relates to a scan marker for facebow for facebow transfer to a virtual articulator, comprising: a fastening part fastened to a base frame of the facebow; a rotating unit including a fixed block extending from the fastening unit and a rotating block rotatably installed on the fixed block; and a scan recognition unit including a guide bar which is inserted into a guide groove provided in the rotating block so as to be able to be drawn in and out, and a mark unit installed on one end of the guid bar and identifying the relative position in three-dimensional space with respect to a bite fork installed in the facebow, wherein the mark unit of the scan recognition unit is characterized in that the position data is predetermined in the three-dimensional virtual space of a virtual articulator provided in a dental CAD program. The purpose of the present invention is to provide a scan marker for the facebow that can be directly mounted on a virtual articulator provided by the dental CAD program with the oral scan data acquired through an oral scanner using the traditionally used face bow.

Description

Scan Marker for Face Bow and Face Bow Transfer Method to Virtual Articulator Using the Same {SCANMARKER FOR FACEBOW, AND METHOD OF FACEBOW TRANSFER TO VIRTUAL ARTICULATOR}

The present invention relates to a technology for transferring a facebow to a virtual articulator provided by a dental CAD program for the patient's oral scan data acquired using an oral scanner.

In general, an articulator is an instrument used for manufacturing and diagnosis of dentures, crown restorations, and prostheses by measuring the occlusal state of teeth and gums.After attaching a tooth model obtained from a patient, that is, a maxillary model and a mandibular model, It is a device that mechanically mimics movement. Articulators are not only used to diagnose diseases that may occur due to occlusal problems and to establish treatment plans, but are also variously used for various dental treatments such as implants and orthodontics.

1 shows a conventional real articulator. As shown in Fig. 1, the physical articulator 10 has bases 11 and 12 at the upper and lower sides, respectively, and the upper and lower bases 11 and 12 each have the maxillary and mandibular mounting plates 13 and 14 attached and detached. It is arranged as possible. The maxillary model 21 and the mandibular model 22 acquired from the patient are arranged in a three-dimensional space according to the occlusal surfaces of the maxillary and mandibular teeth acquired through a facebow. That is, the maxillary model 21 and the mandibular model 22 are arranged according to the occlusal surface of the circumference in the real articulator 10, using fixing materials 21a, 22a such as gypsum, and the upper and lower mounting plates 13 , 14) (generally this process is referred to as mounting). In this way, in a state in which the maxillary model 21 and the mandibular model 22 are occluded, the occlusal state is checked while moving up and down, left and right or back and forth.

In addition, the occlusal surface of the patient is acquired through a facebow. That is, as shown in FIG. 2, the facebow is configured to be able to move freely from the base frame 31 by attaching the bite fork 33 to the base frame 31 that is fastened to the patient's ear. . The bite fork 33 to which the impression material (or wax) 34 is applied is bitten by the patient's mouth and opens the pattern so that the patient's tooth arrangement can be confirmed. The both ends 32 of the base frame 31 are fixed to both ears of the patient, and the base frame 31 is additionally fixed to the patient's forehead to level the position, and then the bite fork 33 that the patient is holding in the mouth. By fixing the position, the occlusal surface of the patient is found. The tooth occlusal surface found in this way is transferred to the maxillary model 21 and the mandibular model 22 by fixing the base frame 31 to the condyl 15 of the articulator 10 (this transfer process is performed by a facebow transfer). Transfer)).

Meanwhile, with the development of digital dentistry, many prostheses are designed using dental CAD programs. Oral scanners continued to develop after being introduced by Mormann and Brandestini of the University of Zurich in Switzerland in the early 1980s, and in the 2000s, other companies also introduced various methods and types of equipment and began to spread to dentistry. In addition, as the dental CAD program developed, a virtual articulator function was added, which is a useful method that can replace the real articulator. However, in order to transfer to the virtual articulator using the traditionally used method using the facebow, after taking an impression, a model was created, mounted on the articulator, and scanned with a model scanner and transferred.

The virtual articulator provided by the above-described dental CAD program is difficult to use when manufacturing a prosthesis without models for the maxilla and mandible using an intraoral scanner. Conventionally, in the case of using a virtual articulator, methods of utilizing data on the average human maxillary and mandibular positional relations using standardized facial photos, or using Cone Beam Computed Tomography (CBCT) have been used. However, it is difficult to accurately grasp the maxillary and mandibular structures of individual patients using standardized facial photographs, and using expensive CBCT is unreasonable for universal use in terms of convenience and cost.
(Patent Document 1) KR10-2008-0089805 A

The present invention is to solve the problems of the prior art described above, without making a model for the maxilla and mandible of a patient, using a traditionally used facebow, the oral scan data acquired through the oral scanner is a dental CAD program It aims to provide a scan marker for a facebow that can be directly mounted on a virtual articulator provided by.

The objects of the present invention are not limited to the objects mentioned above, and other objects that are not mentioned will be clearly understood from the following description.

A scan marker for a face bow for transfer of a face bow to a virtual articulator according to the present invention includes: a fastening portion fastened to a base frame of the face bow; A rotating part including a fixed block extending from the fastening part and a rotating block rotatably installed on the fixed block; Includes a guide bar inserted into the guide groove provided in the pivoting block and formed to be retractable and withdrawn, and a marker formed at one end of the guide bar and for identifying a relative position in a three-dimensional space with respect to the bite fork installed on the facebow. And a scan recognition unit, wherein the cover portion of the scan recognition unit is characterized in that the position data is predetermined in a three-dimensional virtual space of a virtual articulator provided by a dental CAD program.

Here, the fastening portion, a pair of brackets mounted on the base frame; It may include; a fixing screw provided on each of the brackets for fixing to the base frame.

In addition, the cover portion may include a plurality of protrusions having a curved outer surface.

In another aspect, the present invention includes the steps of acquiring position data of a virtual scan recognition unit in a three-dimensional virtual space of a virtual articulator provided by a dental CAD program; Manufacturing a scan recognition unit having the same shape and standard as the virtual scan recognition unit; Acquiring three-dimensional oral scan data by taking an impression of a patient using a facebow equipped with a scan marker for a facebow equipped with the scan recognition unit and then scanning the bite fork and the scan recognition unit using an oral scanner; Aligning the oral scan data to the virtual articulator based on the location data of the scan recognition unit and the location data of the virtual scan recognition unit included in the oral scan data, thereby transferring a facebow of the patient's tooth occlusal surface to the virtual articulator It provides a facebow transfer method to a virtual articulator using a facebow scan marker including;

In the process of manufacturing a prosthesis, it is a traditional method to make a maxillary model and a mandible model and transfer the face beam to a real articulator, but this has the disadvantage of being a very cumbersome operation. In order to avoid such inconvenience, in order to use the virtual articulator provided by the dental CAD program, using the average value of a general person is not preferable in terms of accuracy because it does not take into account the specificity of each patient. In addition, the method of obtaining 3D scan data using CBCT is practically difficult due to the risk of radiation, inconvenience in use, and an increase in cost. If the scan marker for a facebow according to the present invention is used, it is possible to directly transfer the oral scan data acquired through a commonly used facebow and an oral scanner to a virtual articulator, so the virtual articulator provided by the dental CAD program You can maximize the advantages of.

1 is a view showing a dental articulator.
2 is a diagram showing a commonly used facebow.
3 is a perspective view showing a scan marker for a facebow according to the present invention.
4 is a schematic diagram showing a state in which a scan recognition unit is installed on a rotating part in the scan marker for a facebow according to the present invention.
5 is a screen image showing a state in which the virtual scan recognition unit designed in the virtual space S of the dental CAD program is arranged on the mandibular mounting plate of the virtual articulator.
6 shows a state in which a patient's impression is obtained by mounting a scan marker according to the present invention to a facebow.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments are illustrated in the drawings and will be described in detail through detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for distinguishing one component from other components.

Conventionally, widely used dental CAD programs include EXOCAD and Dental System (3shape), and a virtual articulator that provides the position of the maxillary and mandible models mounted on a physical articulator using a model scanner. (Virtual Articulator) is transferred (this process is called facebow transfer). In contrast, in the present invention, a scan marker for a facebow capable of directly transferring a facebow to a virtual articulator using a facebow and an oral scanner without using a real articulator and a model scanner, and a method thereof are provided.

Hereinafter, with reference to FIGS. 3 to 6 will be described in detail for the implementation of the present invention.

First, FIG. 3 shows a scan marker 100 for a facebow according to the present invention. As shown in FIG. 3, the scan marker 100 for a face bow includes a fastening part 110 fastened to the base frame 31 of the face bow 30, and a rotating part 120 extending from the fastening part 110. ), and a scan recognition unit 130 that is fastened to the rotation unit 120.

Here, the fastening part 110 is for mounting and fixing the scan marker 100 to the base frame 31 of the face bow 30. The fastening part 110 is a means for fixing the scan marker 100 to the base frame 31 in advance when taking an impression of the patient using the face bow 30. Preferably, the fastening part 110 is provided on a pair of brackets 112 and each bracket 112 in order to firmly fix the position on the base frame 31, so that the scan marker 100 is attached to the base frame 31. ) May be configured to include a fixing screw 111 for fixing. Here, the pair of brackets 112 maintains a horizontal state so that the position of the scan recognition unit 130 is not changed when taking an impression through the face bow 30.

On the other hand, as shown in FIG. 4, the rotating part 120 may be configured to include a fixed block 121 formed to extend from the fastening part 110 and a rotating block 122 that is rotatably installed on the fixed block 121. have. Here, the fixing block 121 is formed to extend from the fastening part 110 through the connection part 113. The rotating block 122 is installed on the fixing block 121 through a screw 123 and a nut 124. The rotating block 122 is rotatably installed with the screw 123 as an axis with respect to the fixed block 121.

In addition, a guide groove (122a) is provided in the rotating block (122), and a scan recognition unit (130) is installed in the guide groove (122a). The scan recognition unit 130 is a three-dimensional for a guide bar 132 inserted into the guide groove 122a to be inserted and withdrawn, and a bite fork formed at one end of the guide bar 132a and installed on the facebow 30 It may be configured to include a marker 131 for identifying a relative position in space. The mark part 131 allows the local area of the scan recognition part 130 to be clearly recognized in the oral scan data acquired using the oral scanner. The mark part 131 is not limited as long as it is a shape that can be identified in the oral scan data, and may have, for example, a protrusion, a groove, or any other shape. In particular, the cover portion 131 may include a plurality of protrusions 131a protruding from the outer circumferential surface. In this case, it is preferable that the outer surface of each of the protrusions 131a is formed in a curved surface. In the scanning process using an oral scanner, if the outer surface of the protrusion has an angled edge, the recognition rate may be lowered due to diffuse reflection.

Then, a method of transferring the patient's impression to the virtual articulator using the above-described facebow scan marker 100 will be described in more detail.

5 is a screen image showing a state in which the virtual scan recognition unit 230 designed in the virtual space S of the dental CAD program is disposed on the mandibular mounting plate 14a of the virtual articulator. Here, the virtual scan recognition unit 230 is a three-dimensional model for manufacturing the real scan recognition unit 130 described above (the scan recognition unit designed in the CAD program is referred to as a virtual scan recognition unit), and the virtual scan recognition unit 230 and the real scan recognition unit 130 have substantially the same shape and standard. For example, the virtual scan recognition unit 230 is designed to have the same configuration as the detailed configuration of the real scan recognition unit 130 described above, that is, the virtual scan recognition unit 230 is a virtual cover unit corresponding to the cover unit 131. 231, a virtual guide bar 232 corresponding to the guide bar 132, and a virtual protrusion 231a corresponding to the protrusion 131a. In particular, the virtual cover portion 231 of the virtual scan recognition unit 230 and the cover portion 131 of the real scan recognition unit 130 have the same shape and standard. In addition, here, for convenience of explanation, the virtual scan recognition unit 230 is aligned with respect to the mandibular mounting plate 14a of the virtual articulator, but the upper mounting plate may be used as a reference. Through this, information (ie, position data) on the relative position of the virtual scan recognition unit 230 with respect to the mandibular mounting plate 14a in the 3D virtual space S in the virtual articulator is determined in advance.

Based on the 3D data of the virtual scan recognition unit 230 designed through the dental CAD program as described above, for example, the real scan recognition unit 130 may be manufactured using a 3D printer (reference numeral 130 in FIG. 3). . The real scan recognition unit 130 may be manufactured using various materials such as synthetic resin. On the other hand, when outputting the virtual scan recognition unit 230 using a 3D printer, the relative positions of the mandibular mounting plate 14a and the virtual scan recognition unit 230 in the virtual space S of the CAD program of FIG. 5 are, It is determined by the extension part 233 connecting the lower mounting plate 14a and the virtual scan recognition part 230. Therefore, based on the 3D data of the mandibular mounting plate 14a, the extension part 233, and the virtual scan recognition part 230 designed on the virtual space S, the same model is produced. The model thus produced is placed in the real articulator in which the face bow 30 is installed, and the face bow 30 is also disposed in the real articulator. After that, the scan marker 100 is fixed to the facebow 30 using the fastening part 110, and the guide bar 132 of the real scan recognition part 130 is fastened to the rotating part 120. At this time, the lead-in distance of the guide bar 132 and the rotation angle of the rotation block 122 are adjusted. In this way, when the scan recognition unit 130 is fixed to the scan marker 100 installed on the facebow 30, the 3D position data of the virtual scan recognition unit 230 in the 3D virtual space of the virtual articulator (that is, the lower face The relative position of the virtual marker 231a with respect to (12a)) may be transferred to the scan marker 100 installed on the facebow 30 as it is. Next, when the model part of the extension part 233 and the mandibular mountain plate 14a is removed from the real scan recognition part 130, the label part 131 of the scan recognition part 130 is finally provided by the CAD program. The scan marker 100 for which position data is determined in advance may be installed on the facebow 30 in the 3D virtual space of the virtual articulator.

In this way, the impression of the patient is obtained using the face bow 30 in which the scan marker 100 is installed. That is, a pattern of the patient's tooth structure is made through the bite fork 33 to which the impression material (wax) 34 is applied, and then the bite fork is fixed along the occlusal surface of the patient through a face bow. Accordingly, information on the relative structure of the patient's jaw joint and the upper and lower jaw can be obtained. 6 shows a state in which a patient's impression is obtained after the scan marker 100 according to the present invention is installed on the facebow 30.

After taking the impression of the patient through the facebow 30, the bite fog 33 and the scan recognition unit 131 are scanned using an oral scanner to obtain 3D oral scan data. At this time, on the bite fork 33, since the impression material 34, in which the patient's tooth structure is copied, is disposed in a solid state, the 3D oral scan data acquired through the oral scanner is based on the patient's upper and lower teeth arrangement state. Have information about it.

In this way, the three-dimensional oral scan data acquired through the oral scanner includes information on the tooth arrangement of the upper and lower jaw of the patient (tooth arrangement structure by the impression material), and the three-dimensional structure between the jaw joint and the upper and lower jaw of the patient. It includes 3D positional data for the scan recognition unit 131 together with the information on. In addition, the scan recognition unit 130 manufactured according to the virtual scan recognition unit 230 designed in the virtual space of the CAD program previously provides relative position information on the mounting plate of the virtual articulator (ie, position coordinate information of the virtual scan recognition unit). Is predetermined. Therefore, the position data for the scan recognition unit 130 included in the 3D oral scan data acquired through the oral scanner and the position data of the virtual scan recognition unit 230 aligned with the mandibular mounting plate 14a of the virtual articulator Based on, if the oral scan data is aligned to the virtual articulator, the occlusal surface of the patient may be facebow transferred to the virtual articulator.

In the process of manufacturing a prosthesis, it is a traditional method to make a maxillary model and a mandibular model and transfer the face beam to a real articulator, but this entails a very cumbersome operation. In order to avoid such inconvenience, when using the virtual articulator of the CAD program, using the average value of a general person is not preferable in terms of accuracy because it does not take into account the specificity of each patient. In addition, the method of obtaining 3D scan data using CBCT is practically difficult due to the risk of radiation, inconvenience in use, and an increase in cost. When using the scan marker for a facebow according to the present invention, a virtual articulator using the oral scan data acquired through a commonly used facebow and an oral scanner without using a real articulator and a model scanner to produce an upper and lower jaw model. Since it is easy to transfer to the face beam, the advantages of the virtual articulator provided by the dental CAD program can be maximized.

Although a preferred embodiment of the present invention has been described so far, those of ordinary skill in the art to which the present invention pertains may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described herein should be considered from a descriptive point of view rather than a limiting point of view, and the scope of the present invention is shown in the claims rather than the above description, and all differences within the scope equivalent thereto are It should be construed as being included in the invention.

Claims (5)

delete delete delete Acquiring positional data of a virtual scan recognition unit in a three-dimensional virtual space of a virtual articulator provided by a dental CAD program;
Manufacturing a scan recognition unit having the same shape and standard as the virtual scan recognition unit;
Acquiring 3D oral scan data by taking an impression of a patient using a facebow equipped with a scan marker for a facebow equipped with the scan recognition unit and then scanning the bite fork and the scan recognition unit using an oral scanner;
Aligning the oral scan data to the virtual articulator based on the location data of the scan recognition unit and the location data of the virtual scan recognition unit included in the oral scan data, thereby transferring the occlusal surface of the patient to the virtual articulator with a facebow. ;
Facebow transfer method to a virtual articulator using a facebow scan marker comprising a.
The method of claim 4,
The scan marker for the face bow,
A fastening part fastened to the base frame of the facebow;
A rotating part including a fixed block extending from the fastening part and a rotating block rotatably installed on the fixed block;
Includes a guide bar inserted into the guide groove provided in the pivoting block and formed to be retractable and withdrawn, and a marker formed at one end of the guide bar to identify the relative position in a three-dimensional space with respect to the bite fork installed on the facebow. Including;
The method of transferring a facebow to a virtual articulator using a scan marker for a facebow, characterized in that the position data of the scan recognition unit is predetermined in a three-dimensional virtual space of a virtual articulator provided by a dental CAD program.

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