The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Yongsheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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diagnossis and treatment of complicated anterior teeth esthetic defects by combination of whole process digital esthetic rehabilitation with periodontic surgery
Journal of Peking University. Health sciences, 2017Co-Authors: Z Li, Hongqiang Ye, W J Hu, Yongsheng ZhouAbstract:To explore a new method of whole-process digital esthetic prosthodontic rehabilitation combined with periodontic surgery for complicated anterior teeth esthetic defects accompanied by soft tissue morphology, to provide an alternative choice for solving this problem under the guidance of three-dimensional (3D) printing digital Dental Model and surgical guide, thus completing periodontic surgery and digital esthetic rehabilitation of anterior teeth.In this study, 12 patients with complicated esthetic problems accompanied by soft tissue morphology in their anterior teeth were included. The dentition and facial images were obtained by intra-oral scanning and three-dimensional (3D) facial scanning and then calibrated. Two esthetic designs and prosthodontic outcome predictions were created by computer aided design /computer aided manufacturing (CAD/CAM) software combined with digital photography, including consideration of white esthetics and comprehensive consideration of pink-white esthetics. The predictive design of prostheses and the facial appearances of the two designs were evaluated by the patients. If the patients chose the design of comprehensive consideration of pink-white esthetics, they would choose whether they would receive periodontic surgery before esthetic rehabilitation. The dentition design cast of those who chose periodontic surgery would be 3D printed for the guide of periodontic surgery accordingly.In light of the two digital designs based on intra-oral scanning, facing scanning and digital photography, the satisfaction rate of the patients was significantly higher for the comprehensive consideration of pink-white esthetic design (P<0.05) and more patients tended to choose priodontic surgery before esthetic rehabilitation. The 3D printed digital Dental Model and surgical guide provided significant instructions for periodontic surgery, and achieved success transfer from digital design to clinical application. The prostheses were fabricated by CAD/CAM, thus realizing the whole-process digital esthetic rehabilitation.The new method for esthetic rehabilitation of complicated anterior teeth esthetic defects accompanied by soft tissue morphology, including patient-involved digital esthetic analysis, design, esthetic outcome prediction, 3D printing surgical guide for periodontic surgery and digital fabrication is a practical technology. This method is useful for improvement of clinical communication efficiency between doctor-patient, doctor-technician and doctors from different departments, and is conducive to multidisciplinary treatment of this complicated anterior teeth esthetic problem.
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diagnossis and treatment of complicated anterior teeth esthetic defects by combination of whole process digital esthetic rehabilitation with periodontic surgery
Journal of Peking University. Health sciences, 2017Co-Authors: Y Liu, Yongsheng ZhouAbstract:OBJECTIVE To explore a new method of whole-process digital esthetic prosthodontic rehabilitation combined with periodontic surgery for complicated anterior teeth esthetic defects accompanied by soft tissue morphology, to provide an alternative choice for solving this problem under the guidance of three-dimensional (3D) printing digital Dental Model and surgical guide, thus completing periodontic surgery and digital esthetic rehabilitation of anterior teeth. METHODS In this study, 12 patients with complicated esthetic problems accompanied by soft tissue morphology in their anterior teeth were included. The dentition and facial images were obtained by intra-oral scanning and three-dimensional (3D) facial scanning and then calibrated. Two esthetic designs and prosthodontic outcome predictions were created by computer aided design /computer aided manufacturing (CAD/CAM) software combined with digital photography, including consideration of white esthetics and comprehensive consideration of pink-white esthetics. The predictive design of prostheses and the facial appearances of the two designs were evaluated by the patients. If the patients chose the design of comprehensive consideration of pink-white esthetics, they would choose whether they would receive periodontic surgery before esthetic rehabilitation. The dentition design cast of those who chose periodontic surgery would be 3D printed for the guide of periodontic surgery accordingly. RESULTS In light of the two digital designs based on intra-oral scanning, facing scanning and digital photography, the satisfaction rate of the patients was significantly higher for the comprehensive consideration of pink-white esthetic design (P<0.05) and more patients tended to choose priodontic surgery before esthetic rehabilitation. The 3D printed digital Dental Model and surgical guide provided significant instructions for periodontic surgery, and achieved success transfer from digital design to clinical application. The prostheses were fabricated by CAD/CAM, thus realizing the whole-process digital esthetic rehabilitation. CONCLUSION The new method for esthetic rehabilitation of complicated anterior teeth esthetic defects accompanied by soft tissue morphology, including patient-involved digital esthetic analysis, design, esthetic outcome prediction, 3D printing surgical guide for periodontic surgery and digital fabrication is a practical technology. This method is useful for improvement of clinical communication efficiency between doctor-patient, doctor-technician and doctors from different departments, and is conducive to multidisciplinary treatment of this complicated anterior teeth esthetic problem.
Mark M Urata - One of the best experts on this subject based on the ideXlab platform.
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current status of surgical planning for orthognathic surgery traditional methods versus 3d surgical planning
Plastic and reconstructive surgery. Global open, 2015Co-Authors: Jeffrey A Hammoudeh, Lori K Howell, Shadi Boutros, Michelle A Scott, Mark M UrataAbstract:Orthognathic surgery requires precise evaluation of complex dentofacial deformities of the craniofacial skeleton. The success of the surgical plan is not only dependent on the accuracy of the skeletal and Dental diagnosis of the deformity but also is unequivocally dependent on presurgical prediction of the proposed jaw movements. It is the task of the surgeon to first define the original position of the dentofacial skeleton and then to estimate the desired final position and finally to develop a 3-dimensional representation of the movements necessary to accomplish the intended goal.1 Traditionally, this has involved detailed preoperative clinical examination, standard facial photography, cephalometric radiographs with tracings, Dental impressions, and articulator-mounted Models. The end goal of all of these steps is to develop a representative blueprint of the current relationship of the maxilla/mandible and the associated dentofacial skeletal dysplasia. That relationship then is used to facilitate Model surgery to determine the feasibility of the proposed jaw movements and to subsequently directly fabricate surgical guide splints which are critical for the accurate intraoperative positioning of the maxilla and/or mandible. This traditional analytical Model surgery integrates the quantitative data and allows transfer of the anticipated 3D movements directly to the patient to facilitate the intraoperative position of the maxilla and/or the mandible.2 This technique has stood the test of time and has allowed for accurate and reproducible surgical correction of the dentofacial skeleton. This technique, however, requires an extensive process of analytical and radiographic analysis, Dental Model fabrication and splint preparation which require an extensive time commitment, and a firm grasp of Dental materials and has the potential to have inaccuracies amplified during the algorithmic process. The advent of virtual surgical planning (VSP) has recently called into question the efficacy and accuracy of traditional analytical Model surgery. Maxillofacial surgery as a discipline was not an organized specialty until the latter half of the 20th century requiring particularly trained surgeons with masterful knowledge of both anatomy and surgical techniques to accomplish successful bony reconstruction.3 Orthognathic surgery in patients with dentofacial abnormalities is an original field within maxillofacial surgery. Modern practices within this particular field have undergone evolutionary development and refinement since its derivation by the first teachers in the early 1900s. The historic development traces its roots back to 1906 when the first surgery to correct at prognathic mandible was performed on a Washington University medical student by plastic surgery pioneer Vilray Blair.4 This ushered in decades of jaw surgery eclipsed by Obwegeser’s introduction of the sagittal split osteotomy in the 1950s and Bell’s research on the vascularization of the upper jaw leading to the safe downfracture of the maxilla in a LeFort I osteotomy.5 In present-day orthognathic surgery, the spectrum of surgical intervention ranges from simple single-jaw and double-jaw surgery to complex cleft craniomaxillofacial orthognathic surgery. Albeit more than 20 years ago and likely an underestimation, a survey performed in 1990 estimated that the current number of people in the United States benefiting from orthognathic surgery was more than 1.5 million.6 With the likelihood of craniomaxillofacial surgeons facing a growing number of patients requiring orthognathic surgery, it is imperative for the clinician to have a sound understanding of Dental facial proportions, development of the craniofacial skeleton, orthodontic preparation for surgical intervention requiring a collaborative team approach with the patient’s orthodontist, and the ability to plan and execute single- and double-jaw surgery. Throughout the last 100 years, the field has undergone significant refinement and development as it relates to technique modification, innovation as it relates to rigid fixation, and recent technological advancements in presurgical planning and splint fabrication. Any discussion surrounding orthognathic surgery in present-day medicine now includes the argument of traditional Model surgery versus VSP. In review of recent literature, one can identify a number of articles defining and celebrating the use of computer-aided design/computer-aided manufacturing (CAD/CAM) in development of surgical planning for the treatment of complex craniomaxillofacial deformities.3,7–12 In addition to the gaining popularity of VSP within orthognathic surgery, a series of recent investigations performed at multiple institutions have confirmed the accuracy of this technique.10 As VSP is proving both highly accurate and efficient, the future of traditional Model surgery comes into question. It is our objective in this article to (1) define both traditional Model surgery and VSP and (2) determine the accuracy and relevance of the 2 methods.
Xiaosheng Cheng - One of the best experts on this subject based on the ideXlab platform.
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Automatic Classification and Segmentation of Teeth on 3D Dental Model Using Hierarchical Deep Learning Networks
IEEE Access, 2019Co-Authors: Sukun Tian, Bei Zhang, Fulai Yuan, Qing Yu, Xiaosheng ChengAbstract:To solve the problem of low efficiency, the complexity of the interactive operation, and the high degree of manual intervention in existing methods, we propose a novel approach based on the sparse voxel octree and 3D convolution neural networks (CNNs) for segmenting and classifying tooth types on the 3D Dental Models. First, the tooth classification method capitalized on the two-level hierarchical feature learning is proposed to solve the misclassification problem in highly similar tooth categories. Second, we exploit an improved three-level hierarchical segmentation method based on the deep convolution features to conduct segmentation of teeth-gingiva and inter-teeth, respectively, and the conditional random field Model is used to refine the boundary of the gingival margin and the inter-teeth fusion region. The experimental results show that the classification accuracy in Level_1 network is 95.96%, the average classification accuracy in Level_2 network is 88.06%, and the accuracy of tooth segmentation is 89.81%. Compared with the existing state-of-the-art methods, the proposed method has higher accuracy and universality, and it has great application potential in the computer-assisted orthodontic treatment diagnosis.
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single tooth Modeling for 3d Dental Model
International Journal of Biomedical Imaging, 2010Co-Authors: Tianran Yuan, Wenhe Liao, Ning Dai, Xiaosheng ChengAbstract:An integrated single-tooth Modeling scheme is proposed for the 3D Dental Model acquired by optical digitizers. The cores of the Modeling scheme are fusion regions extraction, single tooth shape restoration, and single tooth separation. According to the "valley" shape-like characters of the fusion regions between two adjoining teeth, the regions of the 3D Dental Model are analyzed and classified based on the minimum curvatures of the surface. The single tooth shape is restored according to the bioinformation along the hole boundary, which is generated after the fusion region being removed. By using the extracted boundary from the blending regions between the teeth and soft tissues as reference, the teeth can be separated from the 3D Dental Model one by one correctly. Experimental results show that the proposed method can achieve satisfying Modeling results with high-degree approximation of the real tooth and meet the requirements of clinical oral medicine.
Kyurhim Chung - One of the best experts on this subject based on the ideXlab platform.
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computer aided designing and manufacturing of lingual fixed orthodontic appliance using 2d 3d registration software and rapid prototyping
International Journal of Dentistry, 2014Co-Authors: Soonyong Kwon, Kyurhim ChungAbstract:The availability of 3D Dental Model scanning technology, combined with the ability to register CBCT data with digital Models, has enabled the fabrication of orthognathic surgical CAD/CAM designed splints, customized brackets, and indirect bonding systems. In this study, custom lingual orthodontic appliances were virtually designed by merging 3D Model images with lateral and posterior-anterior cephalograms. By exporting design information to 3D CAD software, we have produced a stereolithographic prototype and converted it into a cobalt-chrome alloy appliance as a way of combining traditional prosthetic investment and cast techniques. While the bonding procedure of the appliance could be reinforced, CAD technology simplified the fabrication process by eliminating the soldering phase. This report describes CAD/CAM fabrication of the complex anteroposterior lingual bonded retraction appliance for intrusive retraction of the maxillary anterior dentition. Furthermore, the CAD/CAM method eliminates the extra step of determining the lever arm on the lateral cephalograms and subsequent design modifications on the study Model.
Jeffrey A Hammoudeh - One of the best experts on this subject based on the ideXlab platform.
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current status of surgical planning for orthognathic surgery traditional methods versus 3d surgical planning
Plastic and reconstructive surgery. Global open, 2015Co-Authors: Jeffrey A Hammoudeh, Lori K Howell, Shadi Boutros, Michelle A Scott, Mark M UrataAbstract:Orthognathic surgery requires precise evaluation of complex dentofacial deformities of the craniofacial skeleton. The success of the surgical plan is not only dependent on the accuracy of the skeletal and Dental diagnosis of the deformity but also is unequivocally dependent on presurgical prediction of the proposed jaw movements. It is the task of the surgeon to first define the original position of the dentofacial skeleton and then to estimate the desired final position and finally to develop a 3-dimensional representation of the movements necessary to accomplish the intended goal.1 Traditionally, this has involved detailed preoperative clinical examination, standard facial photography, cephalometric radiographs with tracings, Dental impressions, and articulator-mounted Models. The end goal of all of these steps is to develop a representative blueprint of the current relationship of the maxilla/mandible and the associated dentofacial skeletal dysplasia. That relationship then is used to facilitate Model surgery to determine the feasibility of the proposed jaw movements and to subsequently directly fabricate surgical guide splints which are critical for the accurate intraoperative positioning of the maxilla and/or mandible. This traditional analytical Model surgery integrates the quantitative data and allows transfer of the anticipated 3D movements directly to the patient to facilitate the intraoperative position of the maxilla and/or the mandible.2 This technique has stood the test of time and has allowed for accurate and reproducible surgical correction of the dentofacial skeleton. This technique, however, requires an extensive process of analytical and radiographic analysis, Dental Model fabrication and splint preparation which require an extensive time commitment, and a firm grasp of Dental materials and has the potential to have inaccuracies amplified during the algorithmic process. The advent of virtual surgical planning (VSP) has recently called into question the efficacy and accuracy of traditional analytical Model surgery. Maxillofacial surgery as a discipline was not an organized specialty until the latter half of the 20th century requiring particularly trained surgeons with masterful knowledge of both anatomy and surgical techniques to accomplish successful bony reconstruction.3 Orthognathic surgery in patients with dentofacial abnormalities is an original field within maxillofacial surgery. Modern practices within this particular field have undergone evolutionary development and refinement since its derivation by the first teachers in the early 1900s. The historic development traces its roots back to 1906 when the first surgery to correct at prognathic mandible was performed on a Washington University medical student by plastic surgery pioneer Vilray Blair.4 This ushered in decades of jaw surgery eclipsed by Obwegeser’s introduction of the sagittal split osteotomy in the 1950s and Bell’s research on the vascularization of the upper jaw leading to the safe downfracture of the maxilla in a LeFort I osteotomy.5 In present-day orthognathic surgery, the spectrum of surgical intervention ranges from simple single-jaw and double-jaw surgery to complex cleft craniomaxillofacial orthognathic surgery. Albeit more than 20 years ago and likely an underestimation, a survey performed in 1990 estimated that the current number of people in the United States benefiting from orthognathic surgery was more than 1.5 million.6 With the likelihood of craniomaxillofacial surgeons facing a growing number of patients requiring orthognathic surgery, it is imperative for the clinician to have a sound understanding of Dental facial proportions, development of the craniofacial skeleton, orthodontic preparation for surgical intervention requiring a collaborative team approach with the patient’s orthodontist, and the ability to plan and execute single- and double-jaw surgery. Throughout the last 100 years, the field has undergone significant refinement and development as it relates to technique modification, innovation as it relates to rigid fixation, and recent technological advancements in presurgical planning and splint fabrication. Any discussion surrounding orthognathic surgery in present-day medicine now includes the argument of traditional Model surgery versus VSP. In review of recent literature, one can identify a number of articles defining and celebrating the use of computer-aided design/computer-aided manufacturing (CAD/CAM) in development of surgical planning for the treatment of complex craniomaxillofacial deformities.3,7–12 In addition to the gaining popularity of VSP within orthognathic surgery, a series of recent investigations performed at multiple institutions have confirmed the accuracy of this technique.10 As VSP is proving both highly accurate and efficient, the future of traditional Model surgery comes into question. It is our objective in this article to (1) define both traditional Model surgery and VSP and (2) determine the accuracy and relevance of the 2 methods.