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Kwon T, Choi DI, Hwang J, Lee T, Lee I, Cho S. Panoramic dental tomosynthesis imaging by use of CBCT projection data. Sci Rep 2023; 13:8817. [PMID: 37258603 DOI: 10.1038/s41598-023-35805-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 05/24/2023] [Indexed: 06/02/2023] Open
Abstract
Dental CBCT and panoramic images are important imaging modalities used in dental diagnosis and treatment planning. In order to acquire a panoramic image without an additional panoramic scan, in this study, we proposed a method of reconstructing a panoramic image by extracting panoramic projection data from dental CBCT projection data. After specifying the patient's dental arch from the patient's CBCT image, panoramic projection data are extracted from the CBCT projection data along the appropriate panoramic scan trajectory that fits the dental arch. A total of 40 clinical human datasets and one head phantom dataset were used to test the proposed method. The clinical human dataset used in this study includes cases in which it is difficult to reconstruct panoramic images from CBCT images, such as data with severe metal artifacts or data without teeth. As a result of applying the panoramic image reconstruction method proposed in this study, we were able to successfully acquire panoramic images from the CBCT projection data of various patients. The proposed method acquires a universally applicable panoramic image that is less affected by CBCT image quality and metal artifacts by extracting panoramic projection data from dental CBCT data and reconstructing a panoramic image.
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Affiliation(s)
- Taejin Kwon
- Department of Nuclear and Quantum Engineering (NQE), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Da-In Choi
- Department of Nuclear and Quantum Engineering (NQE), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Jaehong Hwang
- Department of Nuclear and Quantum Engineering (NQE), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Taewon Lee
- Department of Nuclear and Quantum Engineering (NQE), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea
| | - Inje Lee
- Department of ICT, Dentium Co., Ltd., Suwon, Korea
| | - Seungryong Cho
- Department of Nuclear and Quantum Engineering (NQE), Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea.
- KAIST Institutes for ITC and HST, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea.
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Harris P, Harris L, Harrison J, Schmittbuhl M, De Guise J. Automatic Pulp and Teeth Three-Dimensional Modeling of Single and Multi-Rooted Teeth Based on Cone-Beam Computed Tomography Imaging: A Promising Approach With Clinical and Therapeutic Outcomes. Cureus 2023; 15:e38066. [PMID: 37234140 PMCID: PMC10208415 DOI: 10.7759/cureus.38066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/24/2023] [Indexed: 05/27/2023] Open
Abstract
Background Cone-beam computed tomography (CBCT) imaging offers high-quality three-dimensional (3D) acquisition with great spatial resolution, given by the use of isometric voxels, when compared with conventional computed tomography (CT). The current literature supports a median reduction of 76% (up to 85% reduction) of patients' radiation exposure when imaged by CBCT versus CT. Clinical applications of CBCT imaging can benefit both medical and dental professions. Because these images are digital, the use of algorithms can facilitate the diagnosis of pathologies and the management of patients. There is pertinence to developing rapid and efficient segmentation of teeth from facial volumes acquired with CBCT. Methodology In this paper, a segmentation algorithm using heuristics based on pulp and teeth anatomy as a pre-personalized model is proposed for both single and multi-rooted teeth. Results A quantitative analysis was performed by comparing the results of the algorithm to a gold standard obtained from manual segmentation using the Dice index, average surface distance (ASD), and Mahalanobis distance (MHD) metrics. Qualitative analysis was also performed between the algorithm and the gold standard of 78 teeth. The Dice index average for all pulp segmentation (n = 78) was 83.82% (SD = 6.54%). ASD for all pulp segmentation (n = 78) was 0.21 mm (SD = 0.34 mm). Pulp segmentation compared with MHD averages was 0.19 mm (SD = 0.21 mm). The results of teeth segmentation metrics were similar to pulp segmentation metrics. For the total teeth (n = 78) included in this study, the Dice index average was 92% (SD = 13.10%), ASD was low at 0.19 mm (SD = 0.15 mm), and MHD was 0.11 mm (SD = 0.09 mm). Despite good quantitative results, the qualitative analysis yielded fair results due to large categories. When compared with existing automatic segmentation methods, our approach enables an effective segmentation for both pulp and teeth. Conclusions Our proposed algorithm for pulp and teeth segmentation yields results that are comparable to those obtained by the state-of-the-art methods in both quantitative and qualitative analysis, thus offering interesting perspectives in many clinical fields of dentistry.
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Affiliation(s)
| | - Louis Harris
- Research Centre, University of Montreal Hospital Research Centre, Montreal, CAN
- Imaging and Orthopedics Research Laboratory, University of Montreal Hospital Research Centre, Montreal, CAN
| | - Jérôme Harrison
- Research Centre, University of Montreal Hospital Research Centre, Montreal, CAN
- Imaging and Orthopedics Research Laboratory, University of Montreal Hospital Research Centre, Montreal, CAN
- Medical Imaging, École de Technologie Supérieure, Montreal, CAN
| | - Matthieu Schmittbuhl
- Faculty of Dentistry, Université de Montréal, Montreal, CAN
- Research Centre, University of Montreal Hospital Research Centre, Montreal, CAN
| | - Jacques De Guise
- Research Centre, University of Montreal Hospital Research Centre, Montreal, CAN
- Medical Imaging, École de Technologie Supérieure, Montreal, CAN
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Su HY, Hsieh ST, Tsai KZ, Wang YL, Wang CY, Hsu SY, Liu KY, Huang YH, Wei YW, Lu NH, Chen TB. Fusion extracted features from deep learning for identification of multiple positioning errors in dental panoramic imaging. JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY 2023; 31:1315-1332. [PMID: 37840464 DOI: 10.3233/xst-230171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
BACKGROUND Dental panoramic imaging plays a pivotal role in dentistry for diagnosis and treatment planning. However, correctly positioning patients can be challenging for technicians due to the complexity of the imaging equipment and variations in patient anatomy, leading to positioning errors. These errors can compromise image quality and potentially result in misdiagnoses. OBJECTIVE This research aims to develop and validate a deep learning model capable of accurately and efficiently identifying multiple positioning errors in dental panoramic imaging. METHODS AND MATERIALS This retrospective study used 552 panoramic images selected from a hospital Picture Archiving and Communication System (PACS). We defined six types of errors (E1-E6) namely, (1) slumped position, (2) chin tipped low, (3) open lip, (4) head turned to one side, (5) head tilted to one side, and (6) tongue against the palate. First, six Convolutional Neural Network (CNN) models were employed to extract image features, which were then fused using transfer learning. Next, a Support Vector Machine (SVM) was applied to create a classifier for multiple positioning errors, using the fused image features. Finally, the classifier performance was evaluated using 3 indices of precision, recall rate, and accuracy. RESULTS Experimental results show that the fusion of image features with six binary SVM classifiers yielded high accuracy, recall rates, and precision. Specifically, the classifier achieved an accuracy of 0.832 for identifying multiple positioning errors. CONCLUSIONS This study demonstrates that six SVM classifiers effectively identify multiple positioning errors in dental panoramic imaging. The fusion of extracted image features and the employment of SVM classifiers improve diagnostic precision, suggesting potential enhancements in dental imaging efficiency and diagnostic accuracy. Future research should consider larger datasets and explore real-time clinical application.
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Affiliation(s)
- Hsin-Yueh Su
- Department of Radiology, Hualien Armed Forces General Hospital, Hualien County, Taiwan
| | - Shang-Ting Hsieh
- Department of Health Beauty, Fooyin University, Kaohsiung City, Taiwan
| | - Kun-Zhe Tsai
- Department of Periodontology, Mackay Memorial Hospital, Taipei City, Taiwan
| | - Yu-Li Wang
- Department of Radiology, Hualien Armed Forces General Hospital, Hualien County, Taiwan
| | - Chi-Yuan Wang
- Department of Medical Imaging and Radiological Science, I-Shou University, Kaohsiung City, Taiwan
| | - Shih-Yen Hsu
- Department of Information Engineering, I-Shou University, Kaohsiung City, Taiwan
| | - Kuo-Ying Liu
- Department of Radiology, E-DA Cancer Hospital, I-Shou University, Kaohsiung City, Taiwan
| | - Yung-Hui Huang
- Department of Medical Imaging and Radiological Science, I-Shou University, Kaohsiung City, Taiwan
| | - Ya-Wen Wei
- Department of Dentistry, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung City, Taiwan
| | - Nan-Han Lu
- Department of Medical Imaging and Radiological Science, I-Shou University, Kaohsiung City, Taiwan
- Department of Radiology, E-DA Cancer Hospital, I-Shou University, Kaohsiung City, Taiwan
| | - Tai-Been Chen
- Department of Medical Imaging and Radiological Science, I-Shou University, Kaohsiung City, Taiwan
- Institute of Statistics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
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Dental arch definition in computed tomographs using two semi-automatic methods. Med Biol Eng Comput 2022; 60:3499-3508. [DOI: 10.1007/s11517-022-02684-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 09/17/2022] [Indexed: 11/06/2022]
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A Fast Automatic Reconstruction Method for Panoramic Images Based on Cone Beam Computed Tomography. ELECTRONICS 2022. [DOI: 10.3390/electronics11152404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Panoramic images have been widely used in the diagnosis of dental diseases. In the process of panoramic image reconstruction, the position of the dental arch curve usually affects the quality of display content, especially the completion level of the panoramic image. In addition, the metal implants in the patient’s mouth often lead the contrast of the panoramic image to decrease. This paper describes a method to automatically synthesize panoramic images from dental cone beam computed tomography (CBCT) data. The proposed method has two essential features: the first feature is that the method can detect the dental arch curve through axial maximum intensity projection images over different ranges, and the second feature is that our method is able to adjust the intensity distribution of the implant in critical areas, to reduce the impact of the implant on the contrast of the panoramic image. The proposed method was tested on 50 CBCT datasets; the panoramic images generated by this method were compared with images attained from three other commonly used approaches and then subjectively scored by three experienced dentists. In the comprehensive image contrast score, the method in this paper has the highest score of 11.16 ± 2.64 points. The results show that the panoramic images generated by this method have better image contrast.
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Wang X, Xu Z, Tong Y, Xia L, Jie B, Ding P, Bai H, Zhang Y, He Y. Detection and classification of mandibular fracture on CT scan using deep convolutional neural network. Clin Oral Investig 2022; 26:4593-4601. [PMID: 35218428 DOI: 10.1007/s00784-022-04427-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 02/19/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVES This study aimed to evaluate the accuracy and reliability of convolutional neural networks (CNNs) for the detection and classification of mandibular fracture on spiral computed tomography (CT). MATERIALS AND METHODS Between January 2013 and July 2020, 686 patients with mandibular fractures who underwent CT scan were classified and annotated by three experienced maxillofacial surgeons serving as the ground truth. An algorithm including two convolutional neural networks (U-Net and ResNet) was trained, validated, and tested using 222, 56, and 408 CT scans, respectively. The diagnostic performance of the algorithm was compared with the ground truth and evaluated by DICE, accuracy, sensitivity, specificity, and area under the ROC curve (AUC). RESULTS One thousand five hundred six mandibular fractures in nine subregions of 686 patients were diagnosed. The DICE of mandible segmentation using U-Net was 0.943. The accuracies of nine subregions were all above 90%, with a mean AUC of 0.956. CONCLUSIONS CNNs showed comparable reliability and accuracy in detecting and classifying mandibular fractures on CT. CLINICAL RELEVANCE The algorithm for automatic detection and classification of mandibular fractures will help improve diagnostic efficiency and provide expertise to areas with lower medical levels.
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Affiliation(s)
- Xuebing Wang
- Department of Oral and Maxillofacial SurgeryNational Engineering Laboratory for Digital and Material Technology of Stomatology; Beijing Key Laboratory of Digital StomatologyNational Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, No 22 Zhongguancun South Road, Beijing, 100081, People's Republic of China
| | | | - Yanhang Tong
- Department of Oral and Maxillofacial SurgeryNational Engineering Laboratory for Digital and Material Technology of Stomatology; Beijing Key Laboratory of Digital StomatologyNational Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, No 22 Zhongguancun South Road, Beijing, 100081, People's Republic of China
| | - Long Xia
- Plastic Surgery Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Bimeng Jie
- Department of Oral and Maxillofacial SurgeryNational Engineering Laboratory for Digital and Material Technology of Stomatology; Beijing Key Laboratory of Digital StomatologyNational Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, No 22 Zhongguancun South Road, Beijing, 100081, People's Republic of China
| | | | | | - Yi Zhang
- Department of Oral and Maxillofacial SurgeryNational Engineering Laboratory for Digital and Material Technology of Stomatology; Beijing Key Laboratory of Digital StomatologyNational Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, No 22 Zhongguancun South Road, Beijing, 100081, People's Republic of China
| | - Yang He
- Department of Oral and Maxillofacial SurgeryNational Engineering Laboratory for Digital and Material Technology of Stomatology; Beijing Key Laboratory of Digital StomatologyNational Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, No 22 Zhongguancun South Road, Beijing, 100081, People's Republic of China.
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Wei X, Wang Y. Inferior alveolar canal segmentation based on cone-beam computed tomography. Med Phys 2021; 48:7074-7088. [PMID: 34628674 DOI: 10.1002/mp.15274] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 09/19/2021] [Accepted: 09/21/2021] [Indexed: 12/26/2022] Open
Abstract
PURPOSE The shape and position of the inferior alveolar canal (IAC) are analyzed to effectively reduce the risk of iatrogenic injury based on cone-beam computer tomography (CBCT). To assist dental clinicians to make better use of the IAC information, we propose an IAC segmentation method based on CBCT images. METHODS In this paper, CBCT images are first preprocessed by the Hounsfield unit values clipping and gray normalization. Secondly, based on the multi-plane reconstruction (MPR) and curved surface reconstruction, the curved MPR image sets are generated by the smooth dental arch curve with a sampling distance of 1.00 pixels. Then, the K-means clustering algorithm is used to cluster the texture parameters of the gray level-gradient co-occurrence matrix enhanced by the gradient directions to improve the image contrast of the IAC. Finally, the IAC edges are roughly segmented by the 2D line-tracking method, and smoothed by the fourth-order polynomial to obtain the final segmentation result. RESULTS Twenty-one real clinical dental CBCT datasets were used to test the proposed method. The manual segmentation results of two specialized dental clinicians were used as quantitative evaluation criteria. The dice similarity index (DSI), average symmetric surface distance (ASSD), and mean curve distance (MCD) of the left IAC are 0.93 (SD = 0.01), 0.16 mm (SD = 0.05 mm), and 1.59 mm (SD = 0.25 mm), respectively; the DSI, ASSD, and MCD of the right IAC are 0.93 (SD = 0.02), 0.16 mm (SD = 0.05 mm), and 1.60 mm (SD = 0.30 mm), respectively. CONCLUSIONS The proposed method provides an effective image enhancement and segmentation solution to analyze the shape and position of the IAC. Experimental results show that the relationships between the IAC and other structures can be accurately reflected in the panoramic images without superimposition and geometric distortion, and the smooth edges of the IAC can be segmented.
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Affiliation(s)
- Xueqiong Wei
- School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, People's Republic of China
| | - Yuanjun Wang
- School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, People's Republic of China
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Shujaat S, Letelier C, De Grauwe A, Desard H, Orhan K, Vasconcelos KDF, Mangione F, Coucke W, Jacobs R. The influence of image display systems on observers' preference for visualizing subtle dental radiographic abnormalities. Oral Surg Oral Med Oral Pathol Oral Radiol 2020; 132:475-482. [PMID: 33495123 DOI: 10.1016/j.oooo.2020.12.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 12/12/2020] [Accepted: 12/23/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The objectives of this study were to assess observers' preference for standard screens (SSs) or medical displays (MDs) in visualizing difficult-to-diagnose radiographic dental abnormalities and their preference for dental filter tools when utilized with MD systems. STUDY DESIGN A retrospective data set of 60 in vivo radiographs consisting of intraoral (n = 20), panoramic (n = 20), and cone beam computed tomography (n = 20) images was created. Three image display monitors, including an SS, an MD, and an MD with 3 dental filter configurations (bone-low density enhancement filter, tooth-high density enhancement filter, and a combined filter representing regular MD), were utilized to assess 4 observers' monitor preferences in detecting radiographically subtle dental abnormalities. The data were analyzed by using binomial distribution. A P value ≤.05 was considered statistically significant. RESULTS Although observers expressed preference for MD for visualizing some abnormalities when examining intraoral and panoramic radiographs, MD was not preferred for detection of any abnormalities with cone beam computed tomography. There were no significant differences in preference for SS or MD overall (P ≥ .2024). Observers expressed significant preference for the filters in visualizing all but 2 abnormalities (P ≤ .0252). CONCLUSIONS The use of MD monitors enabled with dental filter tools may be preferred for visualizing certain subtle abnormalities.
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Affiliation(s)
- Sohaib Shujaat
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
| | - Carolina Letelier
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Annelore De Grauwe
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Hadewych Desard
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Kaan Orhan
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Karla de Faria Vasconcelos
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Francesca Mangione
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Oral Pathology and Surgery Department & Orofacial Pathologies, Imaging and Biotherapies (EA2496), Faculty of Dental Surgery, Paris Descartes University, Paris, France
| | - Wim Coucke
- Scientific Institute of Public Health, Department of Quality of Medical Laboratories, Brussels, Belgium
| | - Reinhilde Jacobs
- OMFS-IMPATH Research Group, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven & Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden
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Amorim PHJ, Moraes TF, Silva JVL, Pedrini H, Ruben RB. Reconstruction of Panoramic Dental Images Through Bézier Function Optimization. Front Bioeng Biotechnol 2020; 8:794. [PMID: 32903678 PMCID: PMC7438751 DOI: 10.3389/fbioe.2020.00794] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 06/22/2020] [Indexed: 11/13/2022] Open
Abstract
Computed tomography (CT) and X-ray images have been extensively used as a valuable diagnostic tool in dentistry for surgical planning and treatment. Nowadays, dental cone beam CT has been extensively used in dental clinics. Therefore, it is possible to employ three-dimensional (3D) data from the CT to reconstruct a two-dimensional (2D) panoramic dental image that provides a longitudinal view of the mandibular region of the patient, avoiding an additional exposure to X-ray. In this work, we developed a new automatic method for reconstructing 2D panoramic images of the dental arch based on 3D CT images, using Bézier curves and optimization techniques. The proposed method was applied to five patients, some of them with missing teeth, and smooth panoramic images with good contrast were obtained.
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Affiliation(s)
- Paulo H J Amorim
- Tridimensional Technology Division, Center for Information Technology Renato Archer, Campinas, Brazil
| | - Thiago F Moraes
- Tridimensional Technology Division, Center for Information Technology Renato Archer, Campinas, Brazil
| | - Jorge V L Silva
- Tridimensional Technology Division, Center for Information Technology Renato Archer, Campinas, Brazil
| | - Helio Pedrini
- Institute of Computing, University of Campinas, Campinas, Brazil
| | - Rui B Ruben
- CDRsp-ESTG, Polytechnic Institute of Leiria, Leiria, Portugal
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Pirmoradian M, Naeeni HA, Firouzbakht M, Toghraie D, Khabaz MK, Darabi R. Finite element analysis and experimental evaluation on stress distribution and sensitivity of dental implants to assess optimum length and thread pitch. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2020; 187:105258. [PMID: 31830699 DOI: 10.1016/j.cmpb.2019.105258] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 11/29/2019] [Accepted: 12/01/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND AND OBJECTIVE The dental implant is one of the long term proper remedies to recover a missed tooth as a different prosthetic rehabilitation way. The finite element (FE) method and photoelasticity test are employed to achieve stress distribution and sensitivity in dental implants in order to obtain optimum length and thread pitch. METHODS The finite element method and experimental test are developed to evaluate stress distribution and sensitivity around dental implants. Three dimensional FE models of implant-abutment, cortical bone and cancellous bone are created by considering a variation of 0.6 to -1 mm on threads pitch while the implant lengths range from 8.5 mm to 13 mm. Then, axial and oblique forces are applied to the models to obtain the resultant stress contours. RESULTS The results indicate that the resultant von Mises stresses in the implant-abutment, cortical bones, and cancellous bones are different. The optimized setting for length and pitch is suggested according to maximum von Mises stress and sensitivity analysis. CONCLUSIONS It is concluded that the present FE model accurately predicts stress distribution pattern in dental implants. The results indicate that sensitivity of length play a more significant role in comparison with thread pitch. The accuracy of FEM results in comparison with those of the photoelasticity test recommends applying computation methods in medical practice as great potential in terms of future studies.
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Affiliation(s)
- Mostafa Pirmoradian
- Department of Mechanical Engineering, Khomeinishahr branch, Islamic Azad University, Khomeinishahr, Iran.
| | - Hamed Ajabi Naeeni
- Department of Mechanical Engineering, Khomeinishahr branch, Islamic Azad University, Khomeinishahr, Iran
| | - Masih Firouzbakht
- Department of Mechanical Engineering, Khomeinishahr branch, Islamic Azad University, Khomeinishahr, Iran
| | - Davood Toghraie
- Department of Mechanical Engineering, Khomeinishahr branch, Islamic Azad University, Khomeinishahr, Iran
| | - Mohamad Khaje Khabaz
- Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
| | - Reza Darabi
- Department of Prosthodontics, Faculty of Dentistry, Isfahan (Khorasgan) branch, Islamic Azad University, Isfahan, Iran
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