Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models
Measurements of tooth size for estimating inter-arch tooth size discrepancies and inter-tooth distances, essential for orthodontic diagnosis and treatment, are primarily done using traditional methods involving plaster models and calipers. These methods are time-consuming and labor-intensive, requir...
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| Format: | Article |
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MDPI AG
2024-12-01
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| Series: | Bioengineering |
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| Online Access: | https://www.mdpi.com/2306-5354/12/1/22 |
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| author | Thong Phi Nguyen Jang-Hoon Ahn Hyun-Kyo Lim Ami Kim Jonghun Yoon |
| author_facet | Thong Phi Nguyen Jang-Hoon Ahn Hyun-Kyo Lim Ami Kim Jonghun Yoon |
| author_sort | Thong Phi Nguyen |
| collection | DOAJ |
| description | Measurements of tooth size for estimating inter-arch tooth size discrepancies and inter-tooth distances, essential for orthodontic diagnosis and treatment, are primarily done using traditional methods involving plaster models and calipers. These methods are time-consuming and labor-intensive, requiring multiple steps. With advances in cone-beam computerized tomography (CBCT) and intraoral scanning technology, these processes can now be automated through computer analyses. This study proposes a multi-step computational method for measuring mesiodistal tooth widths and inter-tooth distances, applicable to both CBCT and scan images of plaster models. The first step involves 3D segmentation of the upper and lower teeth using CBCT, combining results from sagittal and panoramic views. For intraoral scans, teeth are segmented from the gums. The second step identifies the teeth based on an adaptively estimated jaw midline using maximum intensity projection. The third step uses a decentralized convolutional neural network to calculate key points representing the parameters. The proposed method was validated against manual measurements by orthodontists using plaster models, achieving an intraclass correlation coefficient of 0.967 and a mean absolute error of less than 1 mm for all tooth types. An analysis of variance test confirmed the statistical consistency between the method’s measurements and those of human experts. |
| format | Article |
| id | doaj-art-b0015d8394dc4448beb445be777980ef |
| institution | Kabale University |
| issn | 2306-5354 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Bioengineering |
| spelling | doaj-art-b0015d8394dc4448beb445be777980ef2025-01-24T13:22:59ZengMDPI AGBioengineering2306-53542024-12-011212210.3390/bioengineering12010022Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental ModelsThong Phi Nguyen0Jang-Hoon Ahn1Hyun-Kyo Lim2Ami Kim3Jonghun Yoon4Department of Mechanical Design Engineering, Hanyang University, 222, Wangsimni-ro, Seongdongsu, Seoul 04763, Republic of KoreaDepartment of Orthodontics, Gwangmyeong Hospital, Chungang University, 110, Deokan-ro, Gwangmyeong 07440, Gyeonggi-do, Republic of KoreaDepartment of Mechanical Design Engineering, Hanyang University, 222, Wangsimni-ro, Seongdongsu, Seoul 04763, Republic of KoreaSeoul Ami Orthodontic Private Practice, 22, Harmony-ro, 178 Beon-gil, Yeonsu-gu, Incheon 22011, Republic of KoreaBK21 FOUR ERICA-ACE Center, Hanyang University, Ansan 15588, Gyeonggi-do, Republic of KoreaMeasurements of tooth size for estimating inter-arch tooth size discrepancies and inter-tooth distances, essential for orthodontic diagnosis and treatment, are primarily done using traditional methods involving plaster models and calipers. These methods are time-consuming and labor-intensive, requiring multiple steps. With advances in cone-beam computerized tomography (CBCT) and intraoral scanning technology, these processes can now be automated through computer analyses. This study proposes a multi-step computational method for measuring mesiodistal tooth widths and inter-tooth distances, applicable to both CBCT and scan images of plaster models. The first step involves 3D segmentation of the upper and lower teeth using CBCT, combining results from sagittal and panoramic views. For intraoral scans, teeth are segmented from the gums. The second step identifies the teeth based on an adaptively estimated jaw midline using maximum intensity projection. The third step uses a decentralized convolutional neural network to calculate key points representing the parameters. The proposed method was validated against manual measurements by orthodontists using plaster models, achieving an intraclass correlation coefficient of 0.967 and a mean absolute error of less than 1 mm for all tooth types. An analysis of variance test confirmed the statistical consistency between the method’s measurements and those of human experts.https://www.mdpi.com/2306-5354/12/1/22cone-beam computerized tomographyMask-RCNNteeth segmentationteeth identificationkey points detection |
| spellingShingle | Thong Phi Nguyen Jang-Hoon Ahn Hyun-Kyo Lim Ami Kim Jonghun Yoon Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models Bioengineering cone-beam computerized tomography Mask-RCNN teeth segmentation teeth identification key points detection |
| title | Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models |
| title_full | Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models |
| title_fullStr | Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models |
| title_full_unstemmed | Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models |
| title_short | Automated Measurements of Tooth Size and Arch Widths on Cone-Beam Computerized Tomography and Scan Images of Plaster Dental Models |
| title_sort | automated measurements of tooth size and arch widths on cone beam computerized tomography and scan images of plaster dental models |
| topic | cone-beam computerized tomography Mask-RCNN teeth segmentation teeth identification key points detection |
| url | https://www.mdpi.com/2306-5354/12/1/22 |
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