KR102389662B1 - Method and apparatus for arranging virtual tooth, computer readable recording medium therefor - Google Patents

Abstract

The present invention relates to a method and apparatus for arranging virtual teeth, and to a computer-readable recording medium therefor, in consideration of the width, length, slope, etc. of the virtual teeth with reference to the residual teeth adjacent to the missing teeth and the arrangement information of the antagonists corresponding to the missing teeth It is automatically placed and provided to the user.
Through this, it is possible to promote convenience so that an implant operation plan can be properly and accurately established.

Description

Virtual tooth arrangement method and apparatus, and computer readable recording medium for the same

The present invention relates to a method and apparatus for aligning virtual teeth, and a computer-readable recording medium therefor. More particularly, it relates to a method and apparatus for arranging virtual teeth for a guide design for an implant procedure, and a computer-readable recording medium for the same.

In general, when the original human tissue is lost, the implant means a substitute that can replace the human tissue, but in dentistry refers to the implantation of artificially made teeth. It is a procedure that restores the function of teeth by implanting a fixture made of titanium, etc., which does not have a rejection reaction in the human body, in the alveolar bone from which the tooth has escaped, to replace the lost root, and then fix the artificial tooth.

An implant is a semi-permanent procedure that does not damage the surrounding tooth tissue and has the advantage of providing artificial teeth that have almost the same function or shape as natural teeth. For implants, it is necessary to check whether the overall treatment plan is appropriate by selecting artificial teeth in advance through computer simulation and arranging them in the expected placement position in advance through computer simulation.

In the conventional simulation method, when selecting a virtual artificial tooth, the user has to directly set the length and width, axis angle, and shape of the virtual tooth. It took a lot of time to do. In addition, users who are not yet experienced may have a lot of difficulty in directly determining the length, width, axis angle, etc. of a suitable virtual tooth.

Republic of Korea Patent Publication No. 10-2033249 (2019. 10. 16)

The technical problem to be solved by the present invention is to provide a virtual tooth arrangement method and apparatus, and a computer readable recording medium for the same, that enable fast and easy implant simulation by automatically providing a virtual tooth arrangement suitable for a user.

Another technical problem to be solved by the present invention is a virtual tooth arrangement method and apparatus capable of proposing an optimal length, width, axial angle and shape of a virtual tooth using arrangement information of residual teeth, and a computer-readable recording medium for the same is to provide

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

A virtual tooth arrangement method performed by a computing device according to an embodiment of the present invention for solving the above technical problem includes the steps of identifying a missing tooth based on tooth data including tooth arrangement information, corresponding to the missing tooth Determining a segment, determining a width of a virtual tooth to replace the missing tooth with reference to arrangement information of residual teeth adjacent to the missing tooth, and referring to arrangement information of an antagonist corresponding to the missing tooth determining the length of the tooth.

As an embodiment, the determining of the width of the virtual tooth includes determining a first contact point where a first residual value located on one side meets the segment based on the missing value, and a first contact point located on the other side based on the missing value. determining a second contact point where the second residual value meets the segment; and determining a width of the virtual tooth based on a distance between the first contact point and the second contact point.

As an embodiment, the determining of the width of the virtual tooth includes determining a first contact point where the first residual value located on one side meets the segment based on the missing value. 2 It may include determining a reference point based on the distal surface of the molar, and determining the width of the virtual tooth based on a distance between the first contact point and the reference point.

As an embodiment, the determining of the width of the virtual tooth includes determining a first contact point where the first residual value located on one side meets the segment based on the missing value. 2 It may include determining a reference point based on the fovea of the molar, and determining the width of the virtual tooth based on a distance between the first contact point and the reference point.

In one embodiment, the missing tooth is one of a plurality of missing teeth continuously missing, and the determining of the width of the virtual tooth based on the distance between the first contact point and the reference point is between the first contact point and the reference point. calculating the distance of , dividing the distance according to the number of the plurality of missing teeth, and determining the width of the virtual tooth based on the division result.

In an embodiment, the dividing the distance may evenly divide the distance according to a ratio of the average crown width of the plurality of missing teeth.

In an embodiment, the determining of the length of the virtual tooth may include determining the length of the virtual tooth based on a distance between the occlusal surface of the antagonist and the gum of the missing tooth. can

In one embodiment, the determining of the length of the virtual tooth includes determining the position of the cutting edge of the virtual tooth based on the position of the cutting edge of the opposing tooth, and the position of the cutting edge of the virtual tooth and the It may include determining the length of the virtual tooth based on the distance from the gum of the missing tooth portion.

In one embodiment, the step of determining the position of the cutting edge of the virtual tooth may include, when the missing value is a maxillary missing tooth, a position separated by a second distance from the position of the cutting edge of the opposing tooth labially by a first distance downward by a second distance, the virtual tooth determining the position of the cutting edge of and, if the missing tooth is a mandibular missing tooth, determining a position separated by a second distance upward by a first distance from the position of the incisal edge of the opposing tooth as the location of the cutting edge of the virtual tooth may include

In one embodiment, determining the inclination of the axis of the opposing tooth as the inclination of the axis of the virtual tooth, and the inclination of the axis connecting the position of the cutting edge of the virtual tooth and the alveolar top to the inclination of the axis of the virtual tooth It may further include the step of determining.

As an embodiment, the method may further include determining the shape of the occlusal surface of the virtual tooth with reference to the shape of the occlusal surface of the antagonist.

As an embodiment, the determining of the shape of the occlusal surface of the virtual tooth may include determining the shape of the occlusal surface of the virtual tooth so that a cusp of the virtual tooth faces the fovea of the antagonist.

In an embodiment, the method may further include determining a dental arch by referring to arrangement information of a plurality of residual teeth included in the tooth data, and arranging the virtual tooth on the dental arch. there is.

According to an embodiment of the present invention for solving the above technical problem, the virtual tooth arrangement device includes a processor, a memory for loading a computer program executed by the processor, and a storage for storing the computer program , the computer program performs an operation of identifying a missing tooth based on tooth data including tooth arrangement information, an operation of determining a segment corresponding to the missing tooth, and an operation to replace the missing tooth with reference to the arrangement information of the remaining teeth adjacent to the missing tooth. and instructions for performing an operation of determining the width of the virtual tooth, and an operation of determining the length of the virtual tooth by referring to arrangement information of an antagonist corresponding to the missing tooth. .

According to an embodiment of the present invention for solving the above technical problem, the computer-readable recording medium includes the steps of identifying a missing tooth based on tooth data including tooth arrangement information, determining a segment corresponding to the missing tooth , determining the width of a virtual tooth to replace the missing tooth with reference to arrangement information of the remaining teeth adjacent to the missing tooth, and the length of the virtual tooth by referring to arrangement information of the antagonist corresponding to the missing tooth ) is recorded with a computer program executing the steps of determining

According to the various embodiments of the present invention described above, since a virtual tooth arrangement suitable for a user is automatically provided during a computer simulation for an implant, a simulation operation can be performed more quickly, and even an unskilled user can easily arrange it. .

In addition, the most suitable length, width, axial angle, and shape of the virtual tooth are suggested using the arrangement information of the remaining teeth, so it helps to establish an implant treatment plan appropriately and accurately.

Effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the embodiments of the present invention.

1 is a flowchart illustrating a virtual tooth arrangement method according to some embodiments of the present invention.
2 is a flowchart illustrating an embodiment in which the step (S100) of confirming the missing value based on the tooth data of FIG. 1 is further detailed.
3 is a diagram schematically illustrating a method of confirming a missing value according to the embodiment of FIG. 2 .
4 is a flowchart illustrating an embodiment in which the step (S200) of determining the width of the virtual tooth of FIG. 1 is further detailed.
FIG. 5 is a diagram schematically explaining a method of determining the width of a virtual tooth when it is not a free-end defect in the embodiment of FIG. 4 .
FIG. 6 is a diagram schematically illustrating a method of determining a width of a virtual tooth for a maxillary missing tooth among pre-end missing teeth in the embodiment of FIG. 4 .
FIG. 7 is a diagram schematically illustrating a method of determining a width of a virtual tooth for a mandibular missing tooth among pre-end missing teeth in the embodiment of FIG. 4 .
FIG. 8 is a diagram illustrating an embodiment of a method of determining a virtual tooth width in the case of a continuous defect in the embodiment of FIG. 4 .
9 is a chart exemplarily showing the average crown width according to the location of the missing tooth referenced in the embodiment of FIG. 8 .
10 is a flowchart illustrating an embodiment in which the step (S300) of determining the length of the virtual tooth of FIG. 1 is further detailed.
11 is a diagram schematically illustrating a method of determining the length of a virtual tooth when a missing tooth is a posterior tooth.
12 is a flowchart illustrating an embodiment in which step S330 is further detailed as a method of determining the length of a virtual tooth when the missing tooth is an anterior tooth.
13 is a diagram schematically illustrating the embodiment of FIG. 12 .
14 is a flowchart illustrating an embodiment in which the step ( S400 ) of determining the inclination of the axis of the virtual tooth of FIG. 1 is further detailed.
15 is a diagram schematically illustrating a method of determining the inclination of the axis of the virtual tooth when the missing tooth is an anterior tooth.
Figure 16 is a virtual case of the missing tooth is a posterior tooth
It is a diagram schematically explaining a method of determining the inclination of the axis of a tooth.
17 is a diagram schematically illustrating a method of determining a shape of a virtual tooth according to the shape of an occlusal surface of an opposing tooth.
18 is a flowchart illustrating an embodiment in which the step ( S600 ) of placing the virtual tooth of FIG. 1 on the dental arch is further detailed.
19 is a diagram illustrating an exemplary method of placing a virtual tooth on a dental arch according to FIG. 18 .
20 is a diagram illustrating a hardware configuration of an exemplary computing device in which various embodiments of the present invention are implemented.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments published below, but may be implemented in various different forms, and only these embodiments allow the publication of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular. The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

Hereinafter, some embodiments of the present invention will be described with reference to the drawings.

1 is a flowchart illustrating a virtual tooth arrangement method according to some embodiments of the present invention. Each step of FIG. 1 is performed by, for example, a virtual tooth alignment device implemented with the computing device 500 described in FIG. 20 . Accordingly, in the following description, if there is a step in which the performing subject is not specified, it is assumed that the performing subject is the virtual tooth arrangement device.

In step S100, the virtual tooth arrangement apparatus obtains tooth data including arrangement information of the subject's teeth, and checks the missing teeth based on the obtained tooth data. Here, the tooth arrangement information is information including the position, shape, number of residual teeth, the position of the occlusal surface, the shape of the occlusal surface, the inclination of the axis, the position of the gums, or the shape of the gums, etc., which will be provided in the form of image information. may be, but is not limited thereto. A detailed method for the virtual tooth arrangement device to check the missing teeth will be described with reference to FIGS. 2 and 3 .

2 is a flowchart illustrating an embodiment in which the step (S100) of confirming the missing value based on the tooth data of FIG. 1 is further detailed.

Referring to FIG. 2 , in step S110 , the virtual tooth arrangement device checks the residual value with reference to the tooth data. In this case, the virtual tooth arrangement apparatus may check the number of teeth of the confirmed residual value and perform numbering on the residual value.

In step S120, the virtual tooth arrangement device determines which position of the tooth is missing based on the confirmed residual value. For example, the virtual tooth arrangement apparatus may check the missing value by moving to the right or left based on the confirmed residual value and checking whether adjacent teeth remain.

In step S130 , the virtual tooth arrangement device determines a segment corresponding to the identified missing tooth and sets it to the position of the corresponding missing tooth. In this case, the virtual tooth arrangement apparatus may determine a segment corresponding to the residual tooth and set a segment corresponding to the position of each residual tooth. As such, an exemplary form in which segments are set for each missing value and residual value is shown in FIG. 3 .

Referring to FIG. 3 , corresponding segments are set for missing values and residual values. Each of the plurality of residual values is numbered to indicate which teeth are currently remaining. A segment 10 corresponding to the missing tooth is set between the position of the missing tooth, that is, between the 14th tooth (1) and the 16th tooth (2), indicating a position at which virtual teeth are to be arranged.

Returning to FIG. 1 , in step S200 , the virtual tooth arrangement apparatus determines the width of the virtual tooth with reference to arrangement information of the adjacent residual teeth. In this case, the width of the virtual tooth may be determined in a different way depending on whether the missing value is a free-end missing value. A specific embodiment thereof will be described with reference to FIGS. 4 to 7 .

4 is a flowchart illustrating an embodiment in which the step (S200) of determining the width of the virtual tooth of FIG. 1 is further detailed. In this embodiment, the width of the virtual tooth is determined based on different criteria depending on whether the missing tooth is a pre-end missing tooth or not, and whether it is a maxillary missing tooth or not. Here, the pre-end deletion refers to a form in which no residual teeth exist in one direction based on the missing teeth, that is, all teeth up to the second molar are missing.

In step S210, the virtual tooth arrangement device determines whether the pre-end defect. If it is not a pre-end defect, the present embodiment proceeds to step S220. If it is a pre-end defect, the present embodiment proceeds to step S250.

Step S220 is not a pre-end defect, and the virtual tooth arrangement device determines a first contact point P1 (refer to FIG. 5 ) where the segment 10 of the missing tooth meets the adjacent first residual tooth 1 .

In step S230 , the virtual tooth arrangement device determines a second contact point P2 (see FIG. 5 ) where the segment 10 of the missing tooth meets the second residual tooth 2 , which is another adjacent residual tooth.

In step S240, the virtual tooth arrangement device based on the previously determined distance (d1, see FIG. 5) between the first contact point (P1) and the second contact point (P2) of the virtual tooth to replace the missing tooth (here, the 15th tooth) determine the width In this case, the virtual tooth arrangement apparatus may determine the distance d1 as the width of the virtual tooth as it is, or determine a value obtained by adding or subtracting a small error to the distance d1 as the width of the virtual tooth.

Returning to step S210 again, in the case of a pre-end defect, the present embodiment proceeds to step S250.

In step S250 , the virtual tooth arrangement device determines a first contact point P1 between the segment 10 and the adjacent first residual tooth 1 .

In step S260 , the virtual tooth arrangement device determines whether the missing tooth is a maxillary missing tooth. In order to determine the width of the virtual tooth, the other distal point (hereinafter referred to as a reference point) corresponding to the first contact point P1 must be determined even, and for this purpose, the virtual tooth arrangement device provides position information of the second molars facing each other. use At this time, since the method of using the position information of the opposing second molars is slightly different depending on whether the missing tooth is a maxillary missing tooth or a mandibular missing tooth, branching occurs depending on the location of the missing tooth. If the missing value is the maxillary missing tooth, the present embodiment proceeds to step S270; otherwise, the present embodiment proceeds to step S280.

Step S270 is a case of a missing maxillary tooth, and the virtual tooth arrangement device determines a reference point based on the distal surface of the mandibular second molar. This will be described in detail with reference to FIG. 6 .

Referring to FIG. 6 , a pre-end case in which a maxillary second premolar (teeth 15) to a second molar (teeth 17) is missing is shown. In order to determine the reference point R1, after calculating the distal surface S1 of the facing second molar 20, the reference surface S2 separated distally by a predetermined distance d2 from the distal surface S1 is determined. . As an embodiment, the distance d2 may be 3 mm. In addition, the virtual tooth arrangement device determines a point on the reference surface S2 at which the distance between the reference surface S2 and the first contact point P1 is the minimum as the reference point R1.

Step S280 is a case of a missing mandible, and the virtual tooth arrangement device determines a reference point based on the central fossa line of the maxillary second molar. This will be described in detail with reference to FIG. 7 .

Referring to FIG. 7 , a pre-end case in which a mandibular second premolar (teeth 15) to a second molar (teeth 17) is missing is shown. In this example, it is assumed that the first contact point P1 is a point where the segment 10 of the 45th missing tooth meets the 44th residual tooth. Meanwhile, in order to determine the reference point R1 , the virtual tooth arrangement device determines the reference line S3 based on the fovea of the second molar 30 facing each other. As an embodiment, the reference line S3 may be a line extending from the fovea of the second molar 30 in the axial direction of the second molar 30 . In addition, the virtual tooth arrangement apparatus determines a point on the reference line S3 at which the distance between the reference line SS and the first contact point P1 is the minimum as the reference point R1.

In step S290, the virtual tooth arrangement device calculates a distance d3 between the first contact point P1 and the reference point R1, and determines the width of the virtual tooth based on the calculated distance d3. At this time, if there is only one missing tooth, the calculated distance d3 will immediately become the width of the virtual tooth. Otherwise, if several teeth are continuously missing, the calculated distance d3 is the sum of the widths of several virtual teeth. Therefore, the calculated distance d3 is again evenly divided according to a certain ratio to determine the width of each virtual tooth. A specific embodiment thereof will be described in detail with reference to FIGS. 8 and 9 .

FIG. 8 is a flowchart of an embodiment in which step S290 of FIG. 4 is embodied, and describes a method of determining a virtual tooth width in case of a continuous defect. In the embodiment of FIG. 8 , the virtual tooth arrangement apparatus determines whether a plurality of teeth are continuously missing ( S291 ). In case of continuous deletion, the present embodiment proceeds to step S292. Otherwise, the present embodiment proceeds directly to step S294.

In step S292, the virtual tooth arrangement device calculates the distance between the first contact point (P1) and the reference point (R1).

In step S293, the virtual tooth arrangement apparatus divides the calculated distance d3 according to the number of missing teeth. As mentioned above, in this case, since the calculated distance d3 is a result of summing the widths of a plurality of virtual teeth, it is necessary to calculate the widths of individual virtual teeth by dividing them evenly according to a predetermined ratio. In this case, the virtual tooth arrangement apparatus may determine the width of each virtual tooth by evenly dividing the distance d3 according to the ratio with reference to the average crown width of the missing teeth.

For example, it is assumed that the average crown width for each missing tooth is defined as shown in the diagram of FIG. 9 . At this time, referring to the case of FIG. 7 , three teeth of the second premolar (teeth 45), first molars (teeth 46), and second molars (teeth 47) of the mandible are continuously missing. In this case, since the calculated distance (d3, assumed to be 28.5 mm here) is the result of adding up the widths of the above three teeth, it is necessary to divide them again to calculate the widths of the three virtual teeth.

In this case, the virtual tooth arrangement apparatus may evenly divide the distance d3 according to the ratio with reference to the average crown width of FIG. 9 . That is, the width of the individual virtual teeth may be determined by dividing the distance calculated by the ratio of the average crown widths of the second premolars, the first molars, and the second molars of the mandible shown in FIG. 9 . Here, the distance d3 of 28.5 mm is divided by 7:11:10.5, which is the ratio of the average crown width of each missing tooth.

In step S294, the virtual tooth arrangement device determines the width of the virtual tooth corresponding to the missing tooth. If it is not a continuous defect (ie, when there is one missing value), the previously calculated distance d1 becomes the width of the virtual tooth as it is, and in the case of a continuous defect, the values divided by step S293 (here, 7mm, 11mm, and 10.5 mm) are the widths of each virtual tooth.

Returning to FIG. 1 again, a method of determining the length of the virtual tooth is described in step S300. The virtual tooth arrangement apparatus uses arrangement information of the opposing teeth (particularly, the position of the occlusal surface and the position of the gum) to determine the length of the virtual tooth. For a detailed description thereof, refer to FIGS. 10 to 13 . Referring to FIG. 10 , the length of the virtual tooth may be determined somewhat differently depending on whether the missing tooth (or virtual tooth) is an anterior tooth or a posterior tooth.

In step S310 , the virtual tooth arrangement device determines whether the missing tooth is an anterior tooth or a posterior tooth. If it is a posterior tooth, this embodiment proceeds to step S320, and if it is an anterior tooth, this embodiment proceeds to step S330.

In step S320, when the missing tooth is a posterior tooth, the virtual tooth arrangement device calculates the distance between the gum of the missing tooth and the occlusal surface of the opposing tooth, and determines the length of the virtual tooth based on the calculated distance. In the case of the posterior teeth, since the occlusal surfaces of the opposing teeth are in contact with each other, the distance from the gums of the missing teeth to the occlusal surfaces of the opposing teeth becomes the length of the virtual teeth. In this case, the virtual tooth arrangement apparatus may directly determine the distance measured from the gum of the missing tooth to the occlusal surface of the opposing tooth as the length of the virtual tooth, or may determine a value obtained by adding or subtracting a predetermined error to the measured distance as the length of the virtual tooth. there is.

Referring to FIG. 11 , the method described in step S320 is schematically illustrated. The virtual tooth arrangement device determines the position of the gums of the missing tooth region (51), determines the position of the occlusal surface of the antagonist again (52), and determines the length of the virtual teeth by calculating the distance (d5) between the gums and the occlusal surface will do

Steps S330 and S340 are cases in which the missing tooth is an anterior tooth, and the virtual tooth arrangement device determines the length of the virtual tooth based on the position of the incisal edge of the opposing tooth. Previously, unlike the case of the posterior teeth, in the anterior teeth, the incisal edges of the opposing teeth do not contact each other and are displaced from each other. Therefore, in this case, the virtual tooth arrangement device determines a position separated by a predetermined distance based on the position of the incisal edge of the opposing tooth as the position of the incisal edge of the virtual tooth (S330), and then the incisal edge in the gum of the virtual tooth. The distance to the distance to determine the length of the virtual tooth (S340).

An embodiment for explaining this in detail is shown in FIGS. 12 and 13 . 12 is a flowchart for a method of determining an incisal edge position of an anterior virtual tooth. Fig. 13 is a diagram schematically illustrating the method of Fig. 1; Hereinafter, it will be described with reference to FIGS. 12 and 13 .

In step S331, the virtual tooth arrangement device determines whether the missing tooth is a maxillary missing tooth or a mandibular missing tooth. If it is a maxillary missing tooth, the present embodiment proceeds to step S332. If it is a mandibular missing tooth, the present embodiment proceeds to step S333.

Step S332 is a case of a missing maxillary tooth. As shown in FIG. 13 (a), in general, the anterior teeth are located at a position where the incisal edge of the maxilla is slightly distant from the incisal edge of the mandible to the labial and downwards, and the maxillary teeth in the anterior part are the The cutting edge is arranged along the occlusal plane SL. Therefore, when the virtual tooth arrangement device determines the cutting edge for the virtual tooth of the maxillary anterior part, it is labially separated by a first distance d6 from the cutting edge 62 of the antagonist (ie, the mandibular anterior teeth) by a second A position separated by the distance d7 is determined as the position of the cutting edge 61 of the virtual tooth (see (b) of FIG. 13). As an embodiment, the first distance and the second distance may be equal to each other, and the first distance or the second distance may be 3 mm.

Step S333 is a case of a missing mandible, and the virtual tooth arrangement device determines a cut sequence of the virtual tooth in a method complementary to that of S332. That is, since the cutting edge of the mandibular missing tooth is obtained from the cutting edge of the maxillary residual tooth, the virtual tooth arrangement device is lingually away from the cutting edge 61 of the antagonist (ie, the maxillary anterior teeth) by a first distance d6 and upwards. A second distance d7 is determined as the position of the cutting edge 62 of the virtual tooth. Similar to the previous case, the first distance and the second distance may be equal to each other, and the first distance or the second distance may be 3 mm.

Returning to FIG. 1 again, in step S400 , the virtual tooth arrangement device determines the inclination (Angulation) of the axis of the virtual tooth. In this case, the inclination of the axis of the virtual tooth may be determined somewhat differently depending on whether the missing tooth is a posterior tooth or an anterior tooth. A specific embodiment thereof will be described with reference to FIGS. 14 to 16 .

14 is a flowchart illustrating an embodiment in which the step ( S400 ) of determining the inclination of the axis of the virtual tooth of FIG. 1 is further detailed. In this case, the inclination of the axis of the virtual tooth may mean the inclination of the axis of the fixture in which the virtual tooth is to be implanted.

In step S410 , the virtual tooth arrangement device determines whether the missing tooth is an anterior tooth or a posterior tooth. If it is an anterior tooth, the present embodiment proceeds to step S420. If it is a posterior tooth, the present embodiment proceeds to step S430.

Step S420 is a case in which the missing tooth is an anterior tooth, and the virtual tooth arrangement device determines the inclination of the axis connecting the position of the cutting edge of the virtual tooth calculated in step S330 and the alveolar top of the missing tooth region as the inclination of the axis of the virtual tooth. For a detailed description of this, referring to (a) of 15, when the missing tooth is the maxillary anterior tooth, when the cutting edge 71a of the virtual tooth 71 is determined, the cutting edge 71a and the alveolar normal H1 are connected. An imaginary axis (or line) may be determined. At this time, this axis may be determined as an inclination (Angulation) of the axis of the virtual tooth 71 . Similarly, even when the missing tooth is a mandibular anterior tooth, a virtual axis connecting the cutting edge 72a of the virtual tooth 72 and the alveolar peak H2 may be determined as the axis of the virtual tooth.

15 (b) is a diagram for explaining the definition of the alveolar top. Referring to (b) of FIG. 15 , the alveolar peak is a point located in the center of the root region and refers to the normal (H) point of the protruding gum.

Step S430 is a case in which the missing tooth is a posterior tooth, and the virtual tooth arrangement device determines the inclination of the axis of the opposing tooth as the inclination of the axis of the virtual tooth. Unlike the anterior teeth, in the posterior region, the inclination of the axis of the virtual tooth (or the inclination of the axis of the fixture in which the virtual tooth is placed) should be the same as the inclination of the axis of the opposing tooth in order to facilitate the distribution of occlusal force. If not, the distribution of occlusal force is not smooth, and various maintenance measures such as fixture fracture, abutment fracture, screw fracture and loosening may occur. Accordingly, in the case of the posterior teeth, the virtual tooth arrangement device determines the inclination of the axis of the virtual tooth at the same angle after measuring the inclination of the axis of the opposing tooth from the tooth data.

Referring to FIG. 16 , an exemplary method for determining the inclination of the axis of the posterior teeth is shown. In FIG. 16 , in order to determine the inclination of the axis X of the virtual teeth 61 , the virtual tooth alignment device is configured to operate the antagonist 62 . After measuring the inclination of the axis X1 of ), the inclination of the axis X of the virtual tooth 61 is determined with the same value.

Returning to FIG. 1 again, in step S500, the virtual tooth arrangement device refers to the occlusal shape of the antagonist to determine the occlusal shape of the virtual tooth. At this time, in the case of anterior teeth in which the antagonists do not occlude with each other, there is no need to consider the antagonists when determining the occlusal shape of the virtual teeth, so step S500 can be applied only to the posterior teeth.

The virtual tooth arrangement device determines the shape of the occlusal surface of the virtual teeth so that the cusps of the occlusal surfaces of the virtual teeth face the fovea of the antagonist teeth. For example, when the virtual tooth is a maxillary posterior tooth, the virtual tooth arrangement device determines the shape of the occlusal surface of the virtual tooth so that the cusp of the virtual tooth, in this case, the lingual cusp, faces the fovea of the mandibular antagonist. . Alternatively, when the virtual tooth is a mandibular posterior tooth, the virtual tooth arrangement device determines the shape of the occlusal surface of the virtual tooth so that the cusp of the virtual tooth, in this case, the Buccal Cusp, faces the fovea of the maxillary opposing tooth.

A schematic example of such a method is shown in FIG. 17 . Referring to FIG. 17 , when the virtual tooth 81 is a mandibular posterior tooth, it can be seen that the occlusal surface shape is determined so that the buccal cusp of the virtual tooth 81 faces the fovea 82a of the maxillary opposing tooth 82. .

In step S600, the virtual tooth arrangement device arranges the virtual teeth generated by the steps S100 to S500 above on the virtual dental arch. A specific embodiment thereof will be described with reference to FIGS. 18 to 19 . 18 is a flowchart illustrating an embodiment in which the step ( S600 ) of placing the virtual tooth of FIG. 1 on the dental arch is further detailed. 19 is a diagram illustrating an exemplary method of placing a virtual tooth on a dental arch according to FIG. 18 . It will be described below with reference to the drawings.

In step S610, the virtual tooth arrangement device determines the dental arch with reference to arrangement information of the residual teeth. Referring to FIG. 19A , an example of determining the dental arch 90 by connecting the feature points after extracting the feature points f1 , f2 , f3 , and f4 from the arrangement information of the residual values is illustrated. The feature points (f1, f2, f3, f4) are the distal (f1) of the outermost residual tooth, the mesial (f2) of the outermost residual tooth, or the point where the other residual tooth meets the gum (f3) or a specific point on the occlusal surface of the residual tooth (f4). ) can be extracted in various ways. Then, the dental arch 90 is determined by calculating an arc connecting the extracted feature points f1, f2, f3, and f4.

In step S620, the virtual tooth arrangement device arranges the virtual teeth generated by steps S100 to S500 on the determined dental arch. Referring to FIG. 19B , it can be seen that the virtual teeth 91 and 92 are arranged side by side to fit the dental arch 90 .

According to the embodiments of the present invention described so far, since the virtual tooth design, such as the width, length, shape, and axial tilt of the virtual tooth, is automatically provided during computer simulation for implant, so that the user can perform the simulation task more quickly In addition, even unskilled users can easily arrange virtual teeth.

In addition, the optimal virtual tooth length, width, axial angle, and shape are suggested using the arrangement information of the residual teeth, thereby preventing human error in the simulation process and helping to establish an implant treatment plan more appropriately and accurately give

Hereinafter, an exemplary computing device 500 capable of implementing the devices described in various embodiments of the present invention will be described with reference to FIG. 20 .

20 is an exemplary hardware configuration diagram illustrating the computing device 500 .

As shown in FIG. 20 , the computing device 500 loads one or more processors 510 , a bus 550 , a communication interface 570 , and a computer program 591 executed by the processor 510 . It may include a memory 530 and a storage 590 for storing the computer program (591). However, only the components related to the embodiment of the present invention are illustrated in FIG. 20 . Accordingly, those skilled in the art to which the present invention pertains can see that other general-purpose components other than the components shown in FIG. 20 may be further included.

The processor 510 controls the overall operation of each component of the computing device 500 . The processor 510 includes at least one of a central processing unit (CPU), a micro processor unit (MPU), a micro controller unit (MCU), a graphic processing unit (GPU), or any type of processor well known in the art. may be included. In addition, the processor 510 may perform an operation on at least one application or program for executing the method/operation according to various embodiments of the present disclosure. Computing device 500 may include one or more processors.

The memory 530 stores various data, commands, and/or information. The memory 530 may load one or more programs 591 from the storage 590 to execute methods/operations according to various embodiments of the present disclosure. An example of the memory 530 may be a RAM, but is not limited thereto.

The bus 550 provides a communication function between components of the computing device 500 . The bus 550 may be implemented as various types of buses, such as an address bus, a data bus, and a control bus.

The communication interface 570 supports wired/wireless Internet communication of the computing device 500 . The communication interface 570 may support various communication methods other than Internet communication. To this end, the communication interface 570 may be configured to include a communication module well-known in the art.

The storage 590 may non-temporarily store one or more computer programs 591 . The storage 590 is a non-volatile memory, such as a read only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a flash memory, a hard disk, a removable disk, or well in the art to which the present invention pertains. It may be configured to include any known computer-readable recording medium.

The computer program 591 may include one or more instructions in which methods/operations according to various embodiments of the present invention are implemented. For example, the computer program 591 refers to an operation of confirming a missing tooth based on tooth data including tooth arrangement information, and arrangement information of a residual tooth adjacent to the missing tooth to determine the width of a virtual tooth to replace the missing tooth. It may include instructions for performing an operation of determining and an operation of determining the length of the virtual tooth by referring to arrangement information of the antagonist corresponding to the missing tooth.

When the computer program 591 is loaded into the memory 530 , the processor 510 may execute the one or more instructions to perform methods/operations according to various embodiments of the present disclosure.

The technical ideas of the present invention described with reference to FIGS. 1 to 20 may be implemented as computer-readable codes on a computer-readable medium. The computer-readable recording medium may be, for example, a removable recording medium (CD, DVD, Blu-ray disk, USB storage device, removable hard disk) or a fixed recording medium (ROM, RAM, computer-equipped hard disk). can The computer program recorded on the computer-readable recording medium may be transmitted to another computing device through a network such as the Internet and installed in the other computing device, thereby being used in the other computing device.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing the technical spirit or essential features. can understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent range should be interpreted as being included in the scope of the technical ideas defined by the present invention.

Claims (13)

A virtual tooth arrangement method performed by a computing device, comprising:
Checking the missing teeth based on the tooth data including the arrangement information of the teeth;
determining a segment corresponding to the missing value;
determining a width of a virtual tooth to replace the missing tooth by referring to arrangement information of residual teeth adjacent to the missing tooth; and
Comprising the step of determining the length of the virtual tooth with reference to the arrangement information of the antagonist corresponding to the missing tooth,
The step of determining the width of the virtual tooth,
determining a first contact point where a first residual value located on one side meets the segment based on the missing value;
determining a reference point based on the fovea of the maxillary second molar when the missing tooth is a mandibular missing tooth; and
determining the width of the virtual tooth based on a distance between the first contact point and the reference point;
How to arrange virtual teeth. According to claim 1,
The step of determining the width of the virtual tooth,
determining a second contact point where a second residual value located on the other side meets the segment based on the missing value; and
Further comprising the step of determining the width of the virtual tooth based on the distance between the first contact point and the second contact point,
How to arrange virtual teeth. According to claim 1,
The missing tooth is one of a plurality of consecutively missing missing teeth,
The step of determining the width of the virtual tooth based on the distance between the first contact point and the reference point,
calculating the distance between the first contact point and the reference point;
dividing the distance according to the number of the plurality of missing teeth; and
Comprising the step of determining the width of the virtual tooth based on the division result,
How to arrange virtual teeth. 4. The method of claim 3,
The step of dividing the distance comprises:
evenly dividing the distance according to the ratio of the average crown width of the plurality of missing teeth,
How to arrange virtual teeth. According to claim 1,
Determining the length of the virtual tooth comprises:
Comprising the step of determining the length of the virtual tooth based on the distance between the occlusal surface of the antagonist and the gum of the missing tooth,
How to arrange virtual teeth. According to claim 1,
Determining the length of the virtual tooth comprises:
determining the position of the cutting edge of the virtual tooth based on the position of the cutting edge of the opposing tooth; and
Comprising the step of determining the length of the virtual tooth based on the distance between the position of the cutting edge of the virtual tooth and the gum of the missing tooth,
How to arrange virtual teeth. 7. The method of claim 6,
The step of determining the position of the cutting edge of the virtual tooth,
determining, as the position of the cutting edge of the virtual tooth, a position separated by a second distance downward by a first distance from the position of the cutting edge of the opposing tooth when the missing tooth is the maxillary missing tooth; and
When the missing tooth is a mandibular missing tooth, comprising determining a position separated by a second distance upward by a first distance from the position of the incisal edge of the opposing tooth as the position of the incisal edge of the virtual tooth,
How to arrange virtual teeth. According to claim 1,
determining the inclination of the axis of the opposing tooth as the inclination of the axis of the virtual tooth; and
Further comprising the step of determining the inclination of the axis connecting the position of the cutting edge of the virtual tooth and the alveolar top as the inclination of the axis of the virtual tooth,
How to arrange virtual teeth. According to claim 1,
Further comprising the step of determining the shape of the occlusal surface of the virtual tooth with reference to the shape of the occlusal surface of the antagonist,
How to arrange virtual teeth. 10. The method of claim 9,
The step of determining the shape of the occlusal surface of the virtual tooth,
Determining the shape of the occlusal surface of the virtual tooth so that the cusp of the virtual tooth faces the fovea of the opposing tooth,
How to arrange virtual teeth. According to claim 1,
determining a dental arch with reference to arrangement information of a plurality of residual teeth included in the tooth data; and
further comprising placing the virtual tooth on the dental arch;
How to arrange virtual teeth. processor;
a memory for loading a computer program executed by the processor; and
A storage for storing the computer program,
The computer program is
The operation of checking the missing teeth based on the tooth data including the arrangement information of the teeth,
determining a segment corresponding to the missing value;
determining a width of a virtual tooth to replace the missing tooth by referring to arrangement information of residual teeth adjacent to the missing tooth; and
Including instructions for determining the length of the virtual tooth with reference to the arrangement information of the antagonist corresponding to the missing tooth,
The operation of determining the width of the virtual tooth is,
Determining a first contact point where the first residual value located on one side meets the segment based on the missing value;
If the missing tooth is a mandibular missing tooth, determining a reference point based on the fovea of the maxillary second molar, and
Comprising the operation of determining the width of the virtual tooth based on the distance between the first contact point and the reference point,
Virtual tooth arrangement device. A computer program for executing the virtual tooth alignment method according to any one of claims 1 to 11 is recorded,
computer readable recording medium.

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