# US 12,002,148 B2 · Method and apparatus for three-dimensionally visualizing root canal curvature of tooth

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- Number: US 12,002,148 B2
- Document ID: US12002148B2
- Status: Granted
- Kind: B2
- Application number: 17/135,198
- Filed: 2020-12-28
- Published: 2021-07-01
- Granted: 2024-06-04
- Earliest claimed: 2019-12-27
- Assignees: Ewoosoft Co., Ltd.; VATECH EWOO Holdings Co., Ltd.
- Applicants: Ewoosoft Co., Ltd.; VATECH EWOO Holdings Co., Ltd.
- Inventors: Tae Min Son; Min Kyung Cuhn; Mi Yong Kim
- Web page: https://patentgrep.com/patent/US12002148B2

## CPC

- A61B 6/46: Arrangements for interfacing with the operator or the patient
- G06T 15/205: {Image-based rendering}
- A61B 6/02: Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B 6/466: {adapted to display 3D data}
- A61B 6/469: {for selecting a region of interest [ROI]}
- A61B 6/488: {involving pre-scan acquisition}
- A61B 6/51: for dentistry
- G06T 15/08: Volume rendering
- G06T 19/20: Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts
- G06T 2215/06: Curved planar reformation of 3D line structures
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Disclosed are a method of and an apparatus for 3D visualization of the root canal curvature of a tooth. The method includes (a) displaying a CT image of one or more teeth on the basis of CT image data, (b) three-dimensionally rendering at least a portion of the root canal of a target tooth when a dental practitioner selects the target tooth from the CT image, and (c) visualizing a curvature in a region of the root canal that is three-dimensionally rendered using a visual factor.

## Claims

### Claim 1

A method of three-dimensionally visualizing the curvature of the root canal of a tooth, the method comprising:
(a) displaying a CT image of one or more teeth on the basis of CT image data of the one or more teeth;
(b) three-dimensionally rendering at least a portion of the root canal of a target tooth when a dental practitioner selects the target tooth on the CT image; and
(c) representing a curvature of at least a portion of the root canal that is three-dimensionally rendered in a visually identifiable manner,
wherein in response to an operation in which the dental practitioner designates a position on at least a portion of the root canal on a three-dimensionally rendered image, the representing (step (c)) comprises visually representing a curvature at the designated position using a visual factor, and
wherein the representing (step (c)) comprises representing a curvature at a position designated by the dental practitioner as a circle abutting the root canal and providing the dental practitioner with the radius of the circle in response to an operation in which the dental practitioner designates the position on the three-dimensionally rendered image of the root canal.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising: generating a panoramic X-ray image of the one or more teeth on the basis of the CT image data in between the displaying (step (a)) and the rendering (step (b)),
wherein the rendering (step (b)) comprises three-dimensionally rendering at least a portion of the root canal of the target tooth when the dental practitioner selects the target tooth from the panoramic X-ray image.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the at least a portion of the root canal includes portions having different curvatures, and
the representing (step (c)) comprises representing the curvatures of the portions in which the curvatures differ visually differently.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in response to an operation in which the dental practitioner sequentially designates multiple positions one after another on at least a portion of the root canal on a three-dimensionally rendered image, the representing (step (c)) comprises sequentially displaying curvatures at the respective designated positions as respective circles adjacent to the root canal one after another.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the circles of different sizes are three-dimensionally arranged on planes having a minimum curvature, at the designated positions, respectively.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the rendering (step (b)) comprises:
displaying cross-sectional images taken along a line intersecting a longitudinal direction of the target tooth on the basis of the CT image data when the dental practitioner selects the target tooth from the CT image;
calculating three-dimensional coordinates of each position designated by the dental practitioner in response to an operation in which the dental practitioner designates the position from one or more selected cross-sectional images of the cross-sectional images; and
three-dimensionally rendering the root canal of the target tooth on the basis of the calculated three-dimensional coordinates.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the rendering (step (b)) comprises:
displaying cross-sectional images corresponding to respectively different portions of the target tooth one after another in response to an operation in which the dental practitioner designates the portions along a longitudinal direction of the target tooth one after another;
calculating three-dimensional coordinates of each position designated by the dental practitioner in response to an operation in which the dental practitioner designates the positions from one or more selected cross-sectional images of the cross-sectional images; and
three-dimensionally rendering the root canal of the target tooth on the basis of the calculated three-dimensional coordinates.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the rendering (step (b)) comprises:
calculating three-dimensional coordinates of the root canal of the target tooth by applying an edge detection algorithm on the CT image data; and
three-dimensionally rendering the root canal of the target tooth on the basis of the calculated three-dimensional coordinates.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the representing (step (c)) comprises representing a curvature at a position designated by the dental practitioner as a circle abutting the root canal in response to an operation in which the dental practitioner designates the position on the three-dimensionally rendered image of the root canal, and
the size of the circle is determined on the basis of a differential value between the designated position and each of positions adjacent to the designated position.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the representing (step (c)) comprises representing a curvature at a position designated by the dental practitioner as a circle abutting the root canal and providing the dental practitioner with a distance between the uppermost position of the root canal and the designated position in response to an operation in which the dental practitioner designates the position on the three-dimensionally rendered image of the root canal.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the representing (step (c)) comprises displaying at least one curvature in at least a portion of the root canal on the three-dimensionally rendered image as at least one visual factor selected from among a symbol, a character, a figure, and a color.