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Ye H, Ye J, Wang S, Wang Z, Geng J, Wang Y, Liu Y, Sun Y, Zhou Y. Comparison of the accuracy (trueness and precision) of virtual dentofacial patients digitized by three different methods based on 3D facial and dental images. J Prosthet Dent 2024; 131:726-734. [PMID: 35369981 DOI: 10.1016/j.prosdent.2022.01.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of virtual dentofacial patients has been explored, but the accuracy of virtual patients established by using a straightforward and reliable method and the accuracy of different virtual patients are unclear. PURPOSE The purpose of this clinical study was to compare the accuracy of virtual dentofacial patients digitized by using registered-block impression, exposed anterior teeth, and cone beam computed tomography (CBCT) reconstruction methods based on 3-dimensional (3D) facial and dental images. MATERIAL AND METHODS From the 15 selected participants who needed CBCT scanning, 3 kinds of virtual dentofacial patients were established by using 3 registration methods based on digital dental casts: 3D facial images, CBCT data, and registered-block impression. Compared with actual measurement, 25 linear distances of all virtual dentofacial patients were selected and measured by using a software program, and 3 separate measurements were calculated by the same person. The 1-way analysis of variance (ANOVA) was used to compare the deviations among 3 kinds of virtual dentofacial patients (trueness) and the deviations within groups (precision). The 1-sample t test was used to compare the difference between the deviation and the ideal error of 0.00 (α=.05). RESULTS Compared with the actual measurement, the trueness of the average deviations for registered-block impression (1.02 ±1.24 mm) was better than that of exposed anterior teeth (2.35 ±1.71 mm) and CBCT reconstruction (2.86 ±1.61 mm). The precision of the average deviations for registered-block impression (1.29 ±1.43 mm) was better than that of exposed anterior teeth (2.00 ±1.72 mm) and CBCT reconstruction (2.12 ±1.94 mm). Significant differences in trueness and precision were found among the 3 groups of virtual dentofacial patients (P<.01). Significant differences among the deviations of all linear distances and the ideal error of 0.00 were observed for all groups of virtual dentofacial patients (P<.05). CONCLUSIONS The accuracy of registered-block impression was better than that of the exposed anterior teeth and CBCT reconstruction. The accuracy of exposed anterior teeth was lower than that of the other methods but could satisfy the requirements of clinical diagnostics and scientific methods. The accuracy of CBCT reconstruction was poor and could only be used for special situations that permitted low accuracy.
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Affiliation(s)
- Hongqiang Ye
- Associate Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Jiahui Ye
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Shimin Wang
- Dental Technician, Center of dental Laboratory, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Zixuan Wang
- Dental Technician, Center of dental Laboratory, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Jing Geng
- Graduate student, Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yiqing Wang
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yunsong Liu
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yuchun Sun
- Professor, Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yongsheng Zhou
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China.
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Lee SJ, Yang HJ, Choi MH, Woo SY, Huh KH, Lee SS, Heo MS, Choi SC, Hwang SJ, Yi WJ. Real-time augmented model guidance for mandibular proximal segment repositioning in orthognathic surgery, using electromagnetic tracking. J Craniomaxillofac Surg 2018; 47:127-137. [PMID: 30447987 DOI: 10.1016/j.jcms.2018.10.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/17/2018] [Accepted: 10/18/2018] [Indexed: 10/28/2022] Open
Abstract
It is essential to reposition the mandibular proximal segment (MPS) as close to its original position as possible during orthognathic surgery. Conventional methods cannot pinpoint the exact position of the condyle in the fossa in real time during repositioning. In this study, based on an improved registration method and a separable electromagnetic tracking tool, we developed a real-time, augmented, model-guided method for MPS surgery to reposition the condyle into its original position more accurately. After virtual surgery planning, using a complex maxillomandibular model, the final position of the virtual MPS model was simulated via 3D rotations. The displacements resulting from the MPS simulation were applied to the MPS landmarks to indicate their final postoperative positions. We designed a new registration body with 24 fiducial points for registration, and determined the optimal point group on the registration body through a phantom study. The registration between the patient's CT image and physical spaces was performed preoperatively using the optimal points. We also developed a separable frame for installing the electromagnetic tracking tool on the patient's MPS. During MPS surgery, the electromagnetic tracking tool was repeatedly attached to, and separated from, the MPS using the separable frame. The MPS movement resulting from the surgeon's manipulation was tracked by the electromagnetic tracking system. The augmented condyle model and its landmarks were visualized continuously in real time with respect to the simulated model and landmarks. Our method also provides augmented 3D coronal and sagittal views of the fossa and condyle, to allow the surgeon to examine the 3D condyle-fossa positional relationship more accurately. The root mean square differences between the simulated and intraoperative MPS models, and between the simulated and postoperative CT models, were 1.71 ± 0.63 mm and 1.89 ± 0.22 mm respectively at three condylar landmarks. Thus, the surgeons could perform MPS repositioning conveniently and accurately based on real-time augmented model guidance on the 3D condyle positional relationship with respect to the glenoid fossa, using augmented and simulated models and landmarks.
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Affiliation(s)
- Sang-Jeong Lee
- Department of Biomedical Radiation Sciences (Head: Sung-Joon Ye, PhD), Graduate School of Convergence Science and Technology, Seoul National University, South Korea
| | - Hoon Joo Yang
- Orthognathic Surgery Center (Head: Soon Jung Hwang, DDS, MD, PhD), Seoul National University Dental Hospital, South Korea
| | - Min-Hyuk Choi
- Department of Biomedical Radiation Sciences (Head: Sung-Joon Ye, PhD), Graduate School of Convergence Science and Technology, Seoul National University, South Korea
| | - Sang-Yoon Woo
- Department of Biomedical Radiation Sciences (Head: Sung-Joon Ye, PhD), Graduate School of Convergence Science and Technology, Seoul National University, South Korea
| | - Kyung-Hoe Huh
- Department of Oral and Maxillofacial Radiology (Head: Min-Suk Heo, DDS, PhD), School of Dentistry and Dental Research Institute, Seoul National University, South Korea
| | - Sam-Sun Lee
- Department of Oral and Maxillofacial Radiology (Head: Min-Suk Heo, DDS, PhD), School of Dentistry and Dental Research Institute, Seoul National University, South Korea
| | - Min-Suk Heo
- Department of Oral and Maxillofacial Radiology (Head: Min-Suk Heo, DDS, PhD), School of Dentistry and Dental Research Institute, Seoul National University, South Korea
| | - Soon-Chul Choi
- Department of Oral and Maxillofacial Radiology (Head: Min-Suk Heo, DDS, PhD), School of Dentistry and Dental Research Institute, Seoul National University, South Korea
| | - Soon Jung Hwang
- Department of Oral and Maxillofacial Surgery (Head: Jin-Young Choi, DDS, MD, PhD), School of Dentistry, Dental Research Institute, BK21 Plus, Seoul National University, South Korea.
| | - Won-Jin Yi
- Department of Biomedical Radiation Sciences (Head: Sung-Joon Ye, PhD), Graduate School of Convergence Science and Technology, Seoul National University, South Korea; Department of Oral and Maxillofacial Radiology (Head: Min-Suk Heo, DDS, PhD), School of Dentistry and Dental Research Institute, Seoul National University, South Korea.
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Lee SJ, Woo SY, Huh KH, Lee SS, Heo MS, Choi SC, Han JJ, Yang HJ, Hwang SJ, Yi WJ. Virtual skeletal complex model- and landmark-guided orthognathic surgery system. J Craniomaxillofac Surg 2016; 44:557-68. [PMID: 27012762 DOI: 10.1016/j.jcms.2016.02.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 01/30/2016] [Accepted: 02/19/2016] [Indexed: 11/26/2022] Open
Abstract
In this study, correction of the maxillofacial deformities was performed by repositioning bone segments to an appropriate location according to the preoperative planning in orthognathic surgery. The surgery was planned using the patient's virtual skeletal models fused with optically scanned three-dimensional dentition. The virtual maxillomandibular complex (MMC) model of the patient's final occlusal relationship was generated by fusion of the maxillary and mandibular models with scanned occlusion. The final position of the MMC was simulated preoperatively by planning and was used as a goal model for guidance. During surgery, the intraoperative registration was finished immediately using only software processing. For accurate repositioning, the intraoperative MMC model was visualized on the monitor with respect to the simulated MMC model, and the intraoperative positions of multiple landmarks were also visualized on the MMC surface model. The deviation errors between the intraoperative and the final positions of each landmark were visualized quantitatively. As a result, the surgeon could easily recognize the three-dimensional deviation of the intraoperative MMC state from the final goal model without manually applying a pointing tool, and could also quickly determine the amount and direction of further MMC movements needed to reach the goal position. The surgeon could also perform various osteotomies and remove bone interference conveniently, as the maxillary tracking tool could be separated from the MMC. The root mean square (RMS) difference between the preoperative planning and the intraoperative guidance was 1.16 ± 0.34 mm immediately after repositioning. After surgery, the RMS differences between the planning and the postoperative computed tomographic model were 1.31 ± 0.28 mm and 1.74 ± 0.73 mm for the maxillary and mandibular landmarks, respectively. Our method provides accurate and flexible guidance for bimaxillary orthognathic surgery based on intraoperative visualization and quantification of deviations for simulated postoperative MMC and landmarks. The guidance using simulated skeletal models and landmarks can complement and improve conventional navigational surgery for bone repositioning in the craniomaxillofacial area.
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Affiliation(s)
- Sang-Jeong Lee
- Department of Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, South Korea
| | - Sang-Yoon Woo
- Department of Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, South Korea
| | - Kyung-Hoe Huh
- Department of Oral and Maxillofacial Radiology, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Sam-Sun Lee
- Department of Oral and Maxillofacial Radiology, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Min-Suk Heo
- Department of Oral and Maxillofacial Radiology, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Soon-Chul Choi
- Department of Oral and Maxillofacial Radiology, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Jeong Joon Han
- Department of Oral and Maxillofacial Surgery, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Hoon Joo Yang
- Department of Oral and Maxillofacial Surgery, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Soon Jung Hwang
- Department of Oral and Maxillofacial Surgery, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.
| | - Won-Jin Yi
- Department of Oral and Maxillofacial Radiology, BK21, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.
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Rangel FA, Chiu YT, Maal TJJ, Bronkhorst EM, Bergé SJ, Kuijpers-Jagtman AM. Does powdering of the dentition increase the accuracy of fusing 3D stereophotographs and digital dental casts. Eur J Orthod 2016; 38:440-5. [PMID: 26781687 DOI: 10.1093/ejo/cjw001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVES The shiny vestibular surfaces of teeth make it difficult to match digital dental casts to 3D stereophotogrammetric images of patient teeth. This study tested whether reducing this shininess by coating the teeth with titanium-oxide powder might improve the accuracy of the matching procedure. METHODS Twenty patients participated in the study. For each patient, 3D stereophotogrammetric images were taken without and with a powder coating. Separately, digital dental casts were created. Next, the digital dental casts were fused with the 3D stereophotogrammetric images of either non-powdered or powdered dentition. Distance maps were created to evaluate the inter-surface distance between the digital dental cast and the 3D images. The matching accuracy was compared for dentition with and without powdering. RESULTS Of all recorded distances between corresponding points, 95% was smaller than 0.84mm for the powdered dentition and smaller than 0.90mm for the non-powdered dentition. Although powdered dentition showed significantly better matching than non-powdered dentition, the difference was less than 0.1mm. Intra-observer statistics showed that five out of 24 repetitions gave significantly different results, but only for dentition that was not powdered. LIMITATIONS The patients did not have any major malocclusions. Severe malocclusions might cause greater difficulty in matching the dentition without powder. Only one type of powder was used, but it effectively reduced shininess. CONCLUSION Powdering the dentition had a small, but significant, positive effect on matching. However, this effect was of minor clinical importance. Therefore, we do not recommend powdering the dentition for 3D stereophotogrammetric images used for matching procedures.
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Affiliation(s)
- Frits A Rangel
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Yu-Ting Chiu
- Division of Craniofacial Orthodontics, Department of Dentistry, Chang Gung Memorial Hospital, Taipei, Taiwan
| | - Thomas J J Maal
- Department of Oral and Craniomaxillofacial Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands, and
| | - Ewald M Bronkhorst
- Department of Preventive and Restorative Dentistry, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Stefaan J Bergé
- Department of Oral and Craniomaxillofacial Surgery, Radboud University Medical Centre, Nijmegen, The Netherlands, and
| | - Anne Marie Kuijpers-Jagtman
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Centre, Nijmegen, The Netherlands,
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Pei Y, Shi F, Chen H, Wei J, Zha H, Jiang R, Xu T. Personalized Tooth Shape Estimation From Radiograph and Cast. IEEE Trans Biomed Eng 2012; 59:2400-11. [PMID: 22084040 DOI: 10.1109/tbme.2011.2174993] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuru Pei
- Key Laboratory of Machine Perception (MOE), Department of Machine Intelligence, Peking University, Beijing 100871, China.
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Lee JH, Won CH, Kong SG. Estimation of operative line of resection using preoperative image and nonrigid registration. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2009; 2008:3983-6. [PMID: 19163585 DOI: 10.1109/iembs.2008.4650082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Even though accurate diagnosis of organs is done using preoperative images such as CT or MRI, these information are not directly used in the operating room, because organs are nonrigid and their shapes change with time. In this paper, we propose to obtain an intraoperative image of an open organ and fuse the image with a preoperative image. The intraoperative image is obtained from a three-dimensional laser scanner. The registration of preoperative image to the intraoperative image can relate the information from the preoperative image to the open organ in the operating room. We do this by registering preoperative images to intraoperative images. An algorithm based on Robust Point Matching method is developed for this nonrigid image registration problem. We also propose a new metric called Non Overlapping Ratio to determine the registration error. The experiments demonstrate that the proposed method is capable of achieving region of interest estimation within 1.51 mm mean distance error and 0.66% Non Overlapping Ratio.
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Affiliation(s)
- Jong-Ha Lee
- Department of Electrical and Computer Engineering, Temple University, PA 19122, USA
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Sohmura T, Hojoh H, Kusumoto N, Nishida M, Wakabayashi K, Takahashi J. A novel method of removing artifacts because of metallic dental restorations in 3-D CT images of jaw bone. Clin Oral Implants Res 2005; 16:728-35. [PMID: 16307581 DOI: 10.1111/j.1600-0501.2005.01139.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
CT images, especially in a three-dimensional (3-D) mode, give valuable information for oral implant surgery. However, image quality is often severely compromised by artifacts originating from metallic dental restorations, and an effective solution for artifacts is being sought. This study attempts to substitute the damaged areas of the jaw bone images with dental cast model images obtained by CT. The position of the dental cast images was registered to that of the jaw bone images using a devised interface that is composed of an occlusal bite made of self-curing acrylic resin and a marker plate made of gypsum. The patient adapted this interface, and CT images of the stomatognathic system were filmed. On the other hand, this interface was placed between the upper and lower cast models and filmed by CT together with the cast models. The position of the marker plate imaged with the dental casts was registered to those adapted by the patient. The error of registration was examined to be 0.25 mm, which was satisfactory for clinical application. The damaged region in the cranial bone images as an obstacle for implant surgery was removed and substituted with the trimmed images of the dental cast. In the method developed here, the images around the metallic compounds severely damaged by artifacts were successfully reconstructed, and the stomatognathic system images became clear, and this is useful for implant surgery.
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Affiliation(s)
- Taiji Sohmura
- Graduate School of Dentistry, Division of Oralmaxillofacial Regeneration, Osaka University, Suita, Osaka, Japan.
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