Method for manufacturing ultra-thin dental prosthesis

Abstract

A method for manufacturing an ultra-thin dental prosthesis according to an embodiment of the present invention comprises the steps of: forming an oral image by using an oral scanner; correcting an axis of the oral image by performing a first correction of the oral image by receiving a facial profile image of a patient in which some tooth surfaces have been deleted using design software; fine-tuning the oral image by performing a second correction of the oral image that has undergone the first correction using the design software; manufacturing an oral model by printing same with a 3D printer using the oral image that has undergone the second correction; forming a prosthetic image using the oral image that has undergone the second correction; and processing a dental prosthesis using the oral model and the prosthetic image.

Description

Method for manufacturing ultra-thin dental prosthesis

[0001] The present invention relates to a method for manufacturing an ultra-thin dental prosthesis, and more particularly, to a method for manufacturing an ultra-thin dental prosthesis that covers or fills a tooth to restore the function of the tooth.

[0002] Dental cosmetic procedures include dental prosthetics, orthodontics, and dental implants. Specifically, dental prosthetics involves covering or filling damaged teeth with a dental prosthesis to restore their function when the tooth's interior or exterior is damaged by diseases like cavities or periodontal disease, or by sudden trauma. These dental prosthetics include resin, inlays, onlays, crowns, and laminates.

[0003] However, when performing dental prosthetic treatment using dental prosthetics such as crowns and laminates, there is a problem of removing too many teeth unnecessarily.

[0004] [Prior Art Literature]

[0005] [Patent Document]

[0006] Korean Patent Registration No. 10-0934643 (December 22, 2009)

[0007] Korean Patent Publication No. 10-2010-0010837 (February 2, 2010)

[0008] The technical problem to be achieved by the present invention is to provide a method for manufacturing an ultra-thin dental prosthesis that can minimize the amount of tooth removal.

[0009] A method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention includes the steps of creating an oral image using an oral scanner, using design software to input a facial photograph of a patient with a partially removed tooth surface and performing a first correction on the oral image to correct an axis of the oral image, performing a second correction on the first-corrected oral image using design software to finely correct the oral image, using the second-corrected oral image to output it using a 3D printer to manufacture an oral model, using the second-corrected oral image to create a prosthesis image, and using the second-corrected oral image to process a dental prosthesis.

[0010] In addition, the step of first correcting the oral image may include a step of setting a nasolabial line, an angle line, and a smile line using a frontal photograph among facial photographs of the patient using the design software, a step of analyzing the upper lip, lower lip, and overjet amount using a lateral photograph among facial photographs of the patient, and a step of correcting the axis of the oral image by analyzing the symmetry of the premolars and the midline of the teeth using a facial photograph showing the incisal edge of the patient's deleted teeth among facial photographs of the patient.

[0011] The second step of correcting the oral image may include a step of correcting the gum line by removing swollen or overlying gums in the oral image, a step of setting a margin line according to a final outline after a portion of the tooth surface is removed, and a step of setting an insertion path along which the dental prosthesis is inserted into the oral image.

[0012] The step of generating the above prosthetic image may include a step of selecting a prosthetic shape that suits the patient's requirements and oral environment from a library of the design software and a step of applying and arranging the selected prosthetic shape to the oral image.

[0013] The step of processing the above dental prosthesis may include a step of first processing a prosthesis block using a milling device to manufacture a first dental prosthesis and a step of second processing the first dental prosthesis using a polishing tool to manufacture a second dental prosthesis.

[0014] A method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention creates a prosthesis image using design software, and manufactures a dental prosthesis using the prosthesis image, thereby minimizing the amount of tooth removal, thereby manufacturing an ultra-thin dental prosthesis more precisely and precisely, while also dramatically reducing the manufacturing time.

[0015] Figure 1 is a flowchart of a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0016] FIG. 2 is a drawing illustrating a method for generating an oral image in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0017] FIG. 3 is a drawing showing a facial photograph among facial photographs in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0018] FIG. 4 is a flowchart of a method for second correction of an oral image in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0019] FIG. 5 is a drawing illustrating a method for correcting a gum line in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0020] FIG. 6 is a drawing explaining a method for setting a margin line in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0021] FIG. 7 is a drawing explaining a method for setting an insertion path in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0022] FIG. 8 is a drawing illustrating a method for manufacturing an oral cavity model in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0023] FIG. 9 is a drawing illustrating a method for generating a prosthesis image in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0024] Figure 10 is a flowchart of a method for processing a dental prosthesis in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0025] Fig. 11 is a perspective view of a dental prosthesis manufactured by a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0026] [Explanation of symbols]

[0027] 10: Oral image

[0028] 20: Prosthetic image

[0029] 30: Oral model

[0030] 40: Dental prosthesis

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0033] FIG. 1 is a flowchart of a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention, and FIG. 2 is a drawing explaining a method for generating an oral image in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0034] As illustrated in FIGS. 1 and 2, a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention first scans a patient's teeth using an oral scanner to generate oral scan data, and design software generates an oral image (10) using the generated oral scan data (S100).

[0035] Design software can be used to provide design tools such as CAD, but is not necessarily limited to this, and various design software can be applied.

[0036] Next, the design software receives a facial photo (P) of a patient captured by a camera and analyzes the input facial photo (P) to perform a first correction on the oral image (10) (S200).

[0037] This is explained in detail below.

[0038] To attach the ultra-thin dental prosthesis used in the present invention to the tooth, a portion of the patient's tooth surface is removed (prepared). At this time, a photograph (P) of the patient's face captured by a camera may show the shape of the tooth with a portion of the tooth surface removed. This allows for the removal of any portion that would interfere with the subsequent manufacturing of the ultra-thin dental prosthesis. However, this is not necessarily limited to this method, and the shape of the removed tooth can be confirmed in various ways.

[0039] First, the design software can correct the axis of the oral image (10) by analyzing the patient's facial photo (P) captured by the camera and performing a first correction on the oral image (10).

[0040] Here, facial photo (P) refers to a photo of the appearance of the face.

[0041] FIG. 3 is a drawing showing a facial photograph among facial photographs in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0042] As illustrated in Fig. 3, the design software sets the nasal line (DL), the corner line (ML), and the smile line using the frontal photograph among the patient's facial photographs (P). Here, the nasal line (DL) is a line connecting the pupils, and the corner line (ML) is a horizontal extension of the mouth corner. In addition, the design software analyzes the upper lip, lower lip, and overjet amount using the side photograph among the patient's facial photographs (P). In addition, the symmetry of the premolars (i.e., molars) and the midline (CL) of the teeth are analyzed using the facial photograph (P) showing the incisal edge of the patient's removed teeth among the patient's facial photographs (P). Here, the midline refers to the central line dividing the human face into left and right.

[0043] Since the patient's oral image (10) generated by the oral scanner is not formed in the correct position but is collected tilted or biased at various angles, the design software analyzes each line of the patient's facial photograph to correct the angle of the tooth axis.

[0044] At this time, in the set model axis of the design software, the oral image (10) is set to fit the horseshoe-shaped frame by considering the arrangement of teeth in the face of the patient whose face photo (P) was analyzed.

[0045] In one embodiment, the design software can generate an image in which each line is displayed so that the frontal image, the nasal corner line, and the smile line can be displayed and output, and the midline can be displayed and output in the side view image. In addition, the design software can generate and provide a 3D image that three-dimensionally implements the image in which the frontal image, the side view, and each line are displayed. Alternatively, the analysis can be performed without outputting the respective lines described above, and only the final image can be generated and output.

[0046] In this way, design software can analyze facial images directly or provide input and output for workers to analyze facial images.

[0047] Next, the design software performs a second correction on the oral image (10) to finely correct the oral image (10) (S300).

[0048] In the case where an oral model (30) is manufactured by directly applying an oral image (10) scanned by an oral scanner and generated by design software, if the sagging gums return to their original state due to swollen gums or tooth arrangement, etc. and the margin line moves toward the gums, a part of the teeth may be exposed when a dental prosthesis is attached to the oral model (30).

[0049] Therefore, in cases where the gums are swollen or sagging, for example, the areas requiring correction of the margin line are predicted in advance, and correction work is performed to increase or decrease the gums to the areas where the gums are predicted to be present. This fine correction work of the oral image (10) is more efficient because the work of inserting a cord such as a thread into the gums to spread the gums and scanning the oral image (especially the image of the oral margin) can be omitted.

[0050] This is explained in detail below.

[0051] FIG. 4 is a flowchart of a method for secondly correcting an oral image in a method for manufacturing an ultra-thin dental prosthesis according to an embodiment of the present invention, FIG. 5 is a drawing explaining a method for correcting a gum line in a method for manufacturing an ultra-thin dental prosthesis according to an embodiment of the present invention, FIG. 6 is a drawing explaining a method for setting a margin line in a method for manufacturing an ultra-thin dental prosthesis according to an embodiment of the present invention, and FIG. 7 is a drawing explaining a method for setting an insertion path in a method for manufacturing an ultra-thin dental prosthesis according to an embodiment of the present invention.

[0052] To this end, as shown in FIGS. 4 and 5, when a tooth is deleted from an oral image (10), the gums that are swollen or covering a portion of the deleted tooth are removed to correct the gum line (11) (S310).

[0053] And, as shown in FIGS. 4 and 6, a margin line (12) is set according to the final outline after a portion of the tooth surface has been deleted (S320). At this time, if the arrangement of the teeth is not good or the amount of tooth material is insufficient, the margin line (12) can be extended backwards. The margin line (12) is a line that contacts the gums of the teeth, and setting the margin line is to set the allowable boundary values ​​of the teeth and dental prosthesis in the design software.

[0054] And, as illustrated in FIGS. 4 and 7, an insertion path (IP), which is a path along which a dental prosthesis is later inserted into an oral image (10), is set (S330). Considering the relationship between the abutment and the milling bur, an insertion path (IP) having an acute angle of incidence is set in the middle area between the incisal, which is the cutting surface of the tooth, and the labial, which is the outer surface of the tooth. The angle of incidence may preferably be 45 degrees. In addition, the design software may directly set an insertion path (IP) with an appropriate angle of incidence or provide an appropriate angle of incidence so that a worker can set the insertion path (IP).

[0055] When observing a tooth from a 90-degree angle, the undercut in the shape of a recess on the side of the tooth is not observed. Therefore, when a dental prosthesis is inserted into a tooth at a 90-degree angle, the inner surface of the dental prosthesis corresponding to the undercut of the tooth does not come into contact with the undercut of the tooth and has an empty space. In addition, when manufacturing a dental prosthesis taking this empty space into account and inserting the dental prosthesis into the tooth, the thickness taken into account may be applied, which may cause the dental prosthesis not to be inserted into the tooth or may cause the dental prosthesis to be damaged. Therefore, the tooth must be inserted into an insertion channel with an appropriate incidence angle. In addition, when correcting the oral image, the insertion of the dental prosthesis along the insertion channel must be taken into account.

[0056] In this way, the design software can directly correct the oral image (10) based on the input information or provide input / output so that the worker can correct the oral image (10).

[0057] Next, an oral model (30) is manufactured (S400).

[0058] FIG. 8 is a drawing illustrating a method for manufacturing an oral cavity model in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0059] As illustrated in Fig. 8, a corrected oral image (10) is used in design software to produce an oral cavity model (30) by outputting the image to a 3D printer. At this time, by using the corrected oral cavity image (10), a more precise oral cavity model (30) can be produced.

[0060] Next, a prosthetic image is created (S500).

[0061] FIG. 9 is a drawing illustrating a method for generating a prosthesis image in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0062] As shown in Fig. 9, a prosthetic image (20) is created using a corrected oral image (10).

[0063] To achieve this, a prosthetic shape that matches the patient's needs and oral environment is selected from the design software's library. The library consists of basic preset shapes provided by the design software, and the user can modify the tooth arrangement and details.

[0064] To select a prosthesis shape, you can select from three manufacturers of prosthesis raw materials—Vita, Candular, and Merz—from the first category in the design software library. Then, you can select a prosthesis shape based on the shape of the tooth from the subcategories.

[0065] For example, if a patient wants full teeth, they can choose the prosthetic shape of Physioset Oval L from Vita, if they want to improve the appearance of old teeth, they can choose the prosthetic shape of Artegral AF BI from Merz, and if they want natural teeth, they can choose the prosthetic shape of Physioset Oval S from Vita.

[0066] Then, by applying and arranging the selected prosthetic shape to the oral image (10), a prosthetic image (20) is generated. At this time, the prosthetic image (20) is generated by comparing it with the tooth scan data before the surface of the patient's teeth is deleted. In addition, the prosthetic image (20) can be corrected using a facial photograph (P). That is, the design software can finely adjust the appearance of the prosthetic image (20), the arrangement of the prosthetic image (20), the inclination of the prosthetic image (20), etc. using the facial photograph (P).

[0067] FIG. 10 is a flowchart of a method for processing an ultra-thin dental prosthesis in a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention, and FIG. 11 is a perspective view of a dental prosthesis manufactured by a method for manufacturing an ultra-thin dental prosthesis according to one embodiment of the present invention.

[0068] As shown in FIGS. 10 and 11, a dental prosthesis (40) is manufactured using a prosthesis image (20) and an oral cavity model (30) (S600).

[0069] A dental prosthesis (40) can be manufactured according to the following method.

[0070] A prosthetic block, which is a material for a dental prosthesis (40), is prepared. The prosthetic block may be made of reinforced ceramic, etc. Such a prosthetic block may have properties similar to those of teeth. The prosthetic block is first processed using a milling device to manufacture a primary dental prosthesis (S610).

[0071] A milling device is a device that precisely carves a prosthetic block from various angles, and is a device that manufactures a primary dental prosthesis based on a prosthetic image (20) and an oral model (30) generated from design software. Data such as the overall size, boundary values, and inner space size of the primary dental prosthesis to be manufactured based on the prosthetic image (20) and the oral model (30) can be input into the milling device.

[0072] Then, the primary dental prosthesis is processed a second time using a polishing tool to manufacture the secondary dental prosthesis (S620).

[0073] The step of manufacturing a secondary dental prosthesis can be performed manually by a dental technician or by equipment such as a robotic arm. At this time, a stone point, a stone wheel, a needle bur, a dia bur, etc. can be used as polishing tools to perform the secondary processing process. At this time, the secondary processing can be performed on only the secondary dental prosthesis, or the secondary processing can be performed while the secondary dental prosthesis is attached to the oral model (30).

[0074] Secondary processing can be performed by additionally cutting the less-cut portion of the primary dental prosthesis, cutting the contact portion that comes into contact with the neighboring teeth, adjusting the thickness of the primary dental prosthesis through external cutting, or forming a curve corresponding to the shape of the teeth.

[0075] These secondary processes are described in detail below.

[0076] The undercut portion close to the margin on the inner surface of the primary dental prosthesis is ground using the first processing tool to manufacture the secondary dental prosthesis. The undercut portion is the portion of the inner surface of the primary dental prosthesis that comes into contact with the abutment tooth, and the undercut portion close to the margin is a spare portion left by the milling device to prevent excessive cutting of the margin. If the undercut portion close to the margin is not removed, the dental prosthesis will lift when attached to the abutment tooth, so adjustment through precise cutting is necessary.

[0077] Then, the margin area on the inner surface of the primary dental prosthesis is ground using a second processing tool to manufacture a secondary dental prosthesis. This margin area is the area on the inner surface of the primary dental prosthesis that comes into contact with the gums, and is a margin left by the milling device to prevent excessive cutting. The thickness of the margin area can be set to match the final outline deleted from the surface of the tooth so that no gap occurs between the dental prosthesis and the abutment.

[0078] In addition, the early contact point of the secondary dental prosthesis is removed. The early contact point is a portion that first comes into contact with the dental prosthesis (40) when it is attached to the oral model (30) and prevents the dental prosthesis (40) from being inserted into the oral model (30), and may be a protrusion formed on the inner surface of the secondary dental prosthesis. This early contact point may be formed in the interproximal portion of the mesiodistal teeth.

[0079] Here, mesial includes mesial and distal, with mesial being closer to the midline and distal being further from the midline. Therefore, these early contact points must be removed so that the dental prosthesis (40) can be properly attached to the oral model (30).

[0080] Then, the thickness of the secondary dental prosthesis is first adjusted using the first thickness adjustment tool. Then, the shape of the secondary dental prosthesis is modified using the shape modification tool. Then, the thickness of the secondary dental prosthesis is secondarily adjusted using the second thickness adjustment tool.

[0081] Then, the secondary processed secondary tooth prosthesis is polished (S630).

[0082] Then, the polished secondary tooth prosthesis is glazed to reproduce a shape and gloss similar to a natural tooth, thereby completing the tooth prosthesis (40) (S640).

[0083] In this way, a method for manufacturing a dental prosthesis according to one embodiment of the present invention generates a prosthesis image using design software, and manufactures a dental prosthesis using the prosthesis image, thereby providing a dental prosthesis that can be accurately applied to a surgical site where teeth have been minimally removed, thereby minimizing the amount of teeth removed.

[0084] Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the patent claims, the detailed description of the invention, and the attached drawings, and it is obvious that this also falls within the scope of the present invention.

Claims

1. A step of creating an oral image using an oral scanner; A step of inputting a facial photograph of a patient with a partially deleted tooth surface using design software and performing a first correction on the oral image to correct the axis of the oral image; A step of performing a second correction on the first corrected oral image using design software to finely correct the oral image; A step of manufacturing an oral cavity model by outputting the second corrected oral cavity image using a 3D printer; A step of generating a prosthetic image using the second corrected oral image; and A method for manufacturing an ultra-thin dental prosthesis, comprising a step of processing a dental prosthesis using the above oral model and the above prosthesis image.

2. In paragraph 1, The first step of correcting the above oral image is: A step of setting the nasal line, the corner line, and the smile line using the facial photo of the patient among the facial photos using the above design software; A step of analyzing the upper lip, lower lip, and overjet area using a side view photograph among the facial photographs of the patient; and A method for manufacturing an ultra-thin dental prosthesis, comprising a step of correcting the axis of the oral cavity image by analyzing the symmetry of the premolars and the midline of the teeth using a facial photograph showing the incisal edge of the patient's deleted teeth among the facial photographs of the patient.

3. In paragraph 2, The second step of correcting the above oral image is: A step of correcting the gum line by removing swollen or overlying gums in the above oral image; A step of setting the margin line according to the final outline after a portion of the tooth surface has been removed; and A method for manufacturing an ultra-thin dental prosthesis, comprising the step of setting an insertion path along which the dental prosthesis is inserted into the oral image.

4. In paragraph 1, The step of generating the above prosthetic image is: A step of selecting a prosthetic shape that suits the patient's needs and oral environment from the library of the above design software; and A method for manufacturing an ultra-thin dental prosthesis, comprising the step of applying and arranging the selected prosthesis shape to the oral image.

5. In paragraph 1, The step of processing the above dental prosthesis is: A step of manufacturing a primary dental prosthesis by first machining a prosthetic block using a milling device; and A method for manufacturing an ultra-thin dental prosthesis, comprising a step of manufacturing a second dental prosthesis by secondarily processing the first dental prosthesis using a polishing tool.

Images