Method and apparatus for determining amount of bone graft, computer-readable recording media, and computer program

Patent metadata

Field	Value
Publication number	US-12558198-B2
Application number	US-202218562110-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Jul 28, 2021
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

Embodiments may provide a method for measuring a site of bone graft and an amount of bone graft around a virtual fixture. To this end, according to embodiments, a type of bone defect may be determined based on bone density information of an alveolar bone around a virtual fixture, and the site of bone graft and the amount of bone graft may be determined according to the determined type of bone defect. According to embodiments, there is an advantageous effect that accurate information can be provided to a user to enable precise grafting during implant surgery.

First claim

The invention claimed is:

1 . A method for determining an amount of bone graft, the method comprising:
placing a virtual fixture in a dental image; based on a bone density of an alveolar bone around the virtual fixture, detecting a boundary area of the alveolar bone; measuring a distribution of the bone density of the alveolar bone around the virtual fixture from at least one cross-sectional image of cross-sectional images in a plurality of directions and, based on the distribution of the bone density of the alveolar bone and the boundary area of the alveolar bone, determining a type of bone defect of the alveolar bone; and based on the type of bone defect, determining an amount of bone to be grafted onto a bone defect area.

2 . The method of claim 1 , wherein the determining of the type of bone defect further includes generating a profile area that is a predetermined distance apart from an outer edge of the virtual fixture, and the distribution of the bone density of the alveolar bone around the virtual fixture is a distribution of a bone density of the profile area.

3 . The method of claim 1 , wherein the type of bone defect includes an internal bone defect, a horizontal bone defect, and a vertical bone defect.

4 . The method of claim 1 , wherein the determining of the amount of bone to be grafted includes designating a bone graft determination range based on the virtual fixture and determining the amount of bone to be grafted within the bone graft determination range.

5 . The method of claim 4 , wherein the bone graft determination range is a first range apart from one side of the virtual fixture, a second range apart from the other side of the virtual fixture, a third range apart from a bottom of the virtual fixture, and a fourth range apart from a top of the virtual fixture.

6 . The method of claim 5 , wherein, in the determining of the amount of bone to be grafted, in a case in which the type of bone defect is the internal bone defect, a volume of a bone defect area is measured by connecting at least two or more upper end areas of the alveolar bone, and the amount of bone to be grafted is determined for a remaining area resulting from excluding a volume of the virtual fixture from the volume of the bone defect area.

7 . The method of claim 5 , wherein, in the determining of the amount of bone to be grafted, in a case in which the type of bone defect is the horizontal bone defect, and an upper surface of the bone graft determination range is at a lower position than an uppermost end of the alveolar bone, the fourth range of the bone graft determination range is changed to a point of the uppermost end of the alveolar bone from the top of the virtual fixture, and the amount of bone to be grafted is determined based on a volume of a remaining area resulting from excluding the volume of the virtual fixture from a volume that fills an inner area of the bone graft determination range that is changed according to the changed fourth range.

8 . The method of claim 5 , wherein, in the determining of the amount of bone to be grafted, in a case in which the type of bone defect is the vertical bone defect, the fourth range of the bone graft determination range is changed to a line connecting the point of the uppermost end of the alveolar bone that is adjacent to the one side of the virtual fixture and the point of the uppermost end of the alveolar bone that is adjacent to the other side of the virtual fixture to each other, and the amount of bone to be grafted is determined based on a volume of a remaining area resulting from excluding the volume of the virtual fixture from a volume that fills an inner area of the bone graft determination range that is changed according to the changed fourth range.

9 . The method of claim 1 , further comprising, after the determining of the amount of bone to be grafted, determining a final amount of bone to be grafted onto the bone defect area based on an amount of bone to be grafted that corresponds to a predetermined proportion of the determined amount of bone to be grafted.

10 . An apparatus for determining an amount of bone graft, the apparatus comprising:
a memory configured to store a simulation control program for determining the amount of bone graft; and a processor configured to run the simulation control program stored in the memory, wherein the processor places a virtual fixture in a dental image, based on a bone density of an alveolar bone around the virtual fixture, detects a boundary area of the alveolar bone, measures a distribution of the bone density of the alveolar bone around the virtual fixture from at least one cross-sectional image of cross-sectional images in a plurality of directions, based on the distribution of the bone density of the alveolar bone and the boundary area of the alveolar bone, determines a type of bone defect of the alveolar bone, and based on the type of bone defect, determines the amount of bone graft.

11 . The apparatus of claim 10 , wherein the processor also generates a profile area that is a predetermined distance apart from an outer edge of the virtual fixture, and the distribution of the bone density of the alveolar bone around the virtual fixture is a distribution of a bone density of the profile area.

12 . The apparatus of claim 10 , wherein the type of bone defect includes an internal bone defect, a horizontal bone defect, and a vertical bone defect.

13 . The apparatus of claim 10 , wherein the processor designates a bone graft determination range based on the virtual fixture and determines the amount of bone graft within the bone graft determination range.

14 . The apparatus of claim 13 , wherein the bone graft determination range is a first range apart from one side of the virtual fixture, a second range apart from the other side of the virtual fixture, a third range apart from a bottom of the virtual fixture, and a fourth range apart from a top of the virtual fixture.

Assignees

• Osstem Implant Co Ltd

Inventors

• Kim Jongmoon
• Cho Sanghyeong
• Choi Kyoo Ok

Classifications

• G06T2207/30036

  Dental; Teeth · CPC title

• G06T2207/30008

  Bone · CPC title

• G06T2207/20084

  Artificial neural networks [ANN] · CPC title

• G06T2207/20081

  Training; Learning · CPC title

• G06T7/0012

  Biomedical image inspection · CPC title