The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Tae Suk Oh - One of the best experts on this subject based on the ideXlab platform.
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The accuracy of patient specific implant prebented with 3D-printed rapid Prototype Model for orbital wall reconstruction
Journal of Cranio-maxillofacial Surgery, 2017Co-Authors: Young Chul Kim, Woo Shik Jeong, Kyung S Koh, Jong Woo Choi, Tae-kyung Park, Tae Suk OhAbstract:Abstract Background This study evaluated the accuracy of blow out fracture reduction using 3D-printed rapid prototyping (RP) skull Modeling. Patients and methods Retrospective review was performed for 82 patients who underwent post-traumatic orbital wall fracture reduction between 2012 and 2014. Patients were divided into two groups according to the use of 3D-printed RP skull Model reproduced by mirroring technique, onto which a titanium mesh was anatomically molded. Using computed tomographic scans, the areas of pre- and post-operative orbital wall defect, the layout angles of the titanium mesh, and the gap lengths between the implant and fracture margin were compared between the two groups. Results Of the 82 patients identified, 46 and 36 were diagnosed with medial and inferior orbital wall fractures, respectively. Bone defect area of the RP group was significantly reduced in comparison with that of the conventional group (8.03 ± 3.5% versus 18.7 ± 15.41% for medial wall fractures, 7.14 ± 5.74% versus 12.8 ± 4.92% for inferior wall fractures, respectively, p p Conclusions More accurate restoration of traumatic orbital wall fractures can be achieved using patient-specific 3D-printed RP skull Models.
Young Chul Kim - One of the best experts on this subject based on the ideXlab platform.
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patient specific puzzle implant preformed with 3d printed rapid Prototype Model for combined orbital floor and medial wall fracture
Journal of Plastic Reconstructive and Aesthetic Surgery, 2017Co-Authors: Young Chul Kim, Jong Woo Choi, Kyung S Koh, Kyunghyun Min, Woo Shik JeongAbstract:Summary Background The management of combined orbital floor and medial wall fractures involving the inferomedial strut is challenging due to absence of stable cornerstone. In this article, we proposed surgical strategies using customized 3D puzzle implant preformed with Rapid Prototype (RP) skull Model. Methods Retrospective review was done in 28 patients diagnosed with combined orbital floor and medial wall fracture. Using preoperative CT scans, original and mirror-imaged RP skull Models for each patient were prepared and sterilized. In all patients, porous polyethylene-coated titanium mesh was premolded onto RP skull Model in two ways; Customized 3D jigsaw puzzle technique was used in 15 patients with comminuted inferomedial strut, whereas individual 3D implant technique was used in each fracture for 13 patients with intact inferomedial strut. Outcomes including enophthalmos, visual acuity, and presence of diplopia were assessed and orbital volume was measured using OsiriX software preoperatively and postoperatively. Results Satisfactory results were achieved in both groups in terms of clinical improvements. Of 10 patients with preoperative diplopia, 9 improved in 6 months, except one with persistent symptom who underwent extraocular muscle rupture. 18 patients who had moderate to severe enophthalmos preoperatively improved, and one remained with mild degree. Orbital volume ratio, defined as volumetric ratio between affected and control orbit, decreased from 127.6% to 99.79% ( p p Conclusion Our surgical strategies using the jigsaw puzzle and individual reconstruction technique provide accurate restoration of combined orbital floor and medial wall fractures.
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The accuracy of patient specific implant prebented with 3D-printed rapid Prototype Model for orbital wall reconstruction
Journal of Cranio-maxillofacial Surgery, 2017Co-Authors: Young Chul Kim, Woo Shik Jeong, Kyung S Koh, Jong Woo Choi, Tae-kyung Park, Tae Suk OhAbstract:Abstract Background This study evaluated the accuracy of blow out fracture reduction using 3D-printed rapid prototyping (RP) skull Modeling. Patients and methods Retrospective review was performed for 82 patients who underwent post-traumatic orbital wall fracture reduction between 2012 and 2014. Patients were divided into two groups according to the use of 3D-printed RP skull Model reproduced by mirroring technique, onto which a titanium mesh was anatomically molded. Using computed tomographic scans, the areas of pre- and post-operative orbital wall defect, the layout angles of the titanium mesh, and the gap lengths between the implant and fracture margin were compared between the two groups. Results Of the 82 patients identified, 46 and 36 were diagnosed with medial and inferior orbital wall fractures, respectively. Bone defect area of the RP group was significantly reduced in comparison with that of the conventional group (8.03 ± 3.5% versus 18.7 ± 15.41% for medial wall fractures, 7.14 ± 5.74% versus 12.8 ± 4.92% for inferior wall fractures, respectively, p p Conclusions More accurate restoration of traumatic orbital wall fractures can be achieved using patient-specific 3D-printed RP skull Models.
Woo Shik Jeong - One of the best experts on this subject based on the ideXlab platform.
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patient specific puzzle implant preformed with 3d printed rapid Prototype Model for combined orbital floor and medial wall fracture
Journal of Plastic Reconstructive and Aesthetic Surgery, 2017Co-Authors: Young Chul Kim, Jong Woo Choi, Kyung S Koh, Kyunghyun Min, Woo Shik JeongAbstract:Summary Background The management of combined orbital floor and medial wall fractures involving the inferomedial strut is challenging due to absence of stable cornerstone. In this article, we proposed surgical strategies using customized 3D puzzle implant preformed with Rapid Prototype (RP) skull Model. Methods Retrospective review was done in 28 patients diagnosed with combined orbital floor and medial wall fracture. Using preoperative CT scans, original and mirror-imaged RP skull Models for each patient were prepared and sterilized. In all patients, porous polyethylene-coated titanium mesh was premolded onto RP skull Model in two ways; Customized 3D jigsaw puzzle technique was used in 15 patients with comminuted inferomedial strut, whereas individual 3D implant technique was used in each fracture for 13 patients with intact inferomedial strut. Outcomes including enophthalmos, visual acuity, and presence of diplopia were assessed and orbital volume was measured using OsiriX software preoperatively and postoperatively. Results Satisfactory results were achieved in both groups in terms of clinical improvements. Of 10 patients with preoperative diplopia, 9 improved in 6 months, except one with persistent symptom who underwent extraocular muscle rupture. 18 patients who had moderate to severe enophthalmos preoperatively improved, and one remained with mild degree. Orbital volume ratio, defined as volumetric ratio between affected and control orbit, decreased from 127.6% to 99.79% ( p p Conclusion Our surgical strategies using the jigsaw puzzle and individual reconstruction technique provide accurate restoration of combined orbital floor and medial wall fractures.
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The accuracy of patient specific implant prebented with 3D-printed rapid Prototype Model for orbital wall reconstruction
Journal of Cranio-maxillofacial Surgery, 2017Co-Authors: Young Chul Kim, Woo Shik Jeong, Kyung S Koh, Jong Woo Choi, Tae-kyung Park, Tae Suk OhAbstract:Abstract Background This study evaluated the accuracy of blow out fracture reduction using 3D-printed rapid prototyping (RP) skull Modeling. Patients and methods Retrospective review was performed for 82 patients who underwent post-traumatic orbital wall fracture reduction between 2012 and 2014. Patients were divided into two groups according to the use of 3D-printed RP skull Model reproduced by mirroring technique, onto which a titanium mesh was anatomically molded. Using computed tomographic scans, the areas of pre- and post-operative orbital wall defect, the layout angles of the titanium mesh, and the gap lengths between the implant and fracture margin were compared between the two groups. Results Of the 82 patients identified, 46 and 36 were diagnosed with medial and inferior orbital wall fractures, respectively. Bone defect area of the RP group was significantly reduced in comparison with that of the conventional group (8.03 ± 3.5% versus 18.7 ± 15.41% for medial wall fractures, 7.14 ± 5.74% versus 12.8 ± 4.92% for inferior wall fractures, respectively, p p Conclusions More accurate restoration of traumatic orbital wall fractures can be achieved using patient-specific 3D-printed RP skull Models.
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customized orbital wall reconstruction using three dimensionally printed rapid Prototype Model in patients with orbital wall fracture
Journal of Craniofacial Surgery, 2016Co-Authors: Woo Shik Jeong, Taik Jin Chang, Kyung S Koh, Jong Woo ChoiAbstract:Background It is difficult to restore original orbital contours because of their complex 3-dimensional structure. Moreover, slight implant malpositioning can result in enophthalmos or other complications. The authors describe our experience of using individualized prebent titanium-Medpor mesh implants and stereolithographic Modeling in a series of patients who underwent orbital wall reconstruction. Methods A consecutive series of 104 patients with orbital fractures received computer simulation-designed prebent titanium-Medpor mesh implants insertion. Preoperative computed tomography (CT) data were processed for each patient, and a rapid prototyping (RP) Model was produced. The uninjured side was concurrently mirrored and superimposed onto the traumatized side to create a mirror image of the RP Model. The authors fabricated the titanium-Medpor implants to intraoperatively reconstruct the 3-dimensional orbital structure. The prefabricated titanium-Medpor implants were inserted into the defective orbital wall and fixed. Postoperative CT images were immediately taken to evaluate the reconstructed contours and compare the preoperative and postoperative intraorbital volumes. Results All reconstructions were successful without postoperative complications. The implants were correctly positioned in the sagittal, axial, and coronal planes relative to the original orbital contours. The mean preoperative intraorbital volumes of the uninjured and traumatized sides were 21.39 ± 1.93 and 23.17 ± 2.00 cm, respectively, and the postoperative mean intraorbital volume was 20.74 ± 2.07 cm. Conclusions Orbital reconstruction can be optimized using individually manufactured rapid Prototype skull Model and premolded synthetic scaffold by computer-aid of mirroring-reconstruction of 3-dimensional images and 3-dimensional printing techniques.
Jong Woo Choi - One of the best experts on this subject based on the ideXlab platform.
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patient specific puzzle implant preformed with 3d printed rapid Prototype Model for combined orbital floor and medial wall fracture
Journal of Plastic Reconstructive and Aesthetic Surgery, 2017Co-Authors: Young Chul Kim, Jong Woo Choi, Kyung S Koh, Kyunghyun Min, Woo Shik JeongAbstract:Summary Background The management of combined orbital floor and medial wall fractures involving the inferomedial strut is challenging due to absence of stable cornerstone. In this article, we proposed surgical strategies using customized 3D puzzle implant preformed with Rapid Prototype (RP) skull Model. Methods Retrospective review was done in 28 patients diagnosed with combined orbital floor and medial wall fracture. Using preoperative CT scans, original and mirror-imaged RP skull Models for each patient were prepared and sterilized. In all patients, porous polyethylene-coated titanium mesh was premolded onto RP skull Model in two ways; Customized 3D jigsaw puzzle technique was used in 15 patients with comminuted inferomedial strut, whereas individual 3D implant technique was used in each fracture for 13 patients with intact inferomedial strut. Outcomes including enophthalmos, visual acuity, and presence of diplopia were assessed and orbital volume was measured using OsiriX software preoperatively and postoperatively. Results Satisfactory results were achieved in both groups in terms of clinical improvements. Of 10 patients with preoperative diplopia, 9 improved in 6 months, except one with persistent symptom who underwent extraocular muscle rupture. 18 patients who had moderate to severe enophthalmos preoperatively improved, and one remained with mild degree. Orbital volume ratio, defined as volumetric ratio between affected and control orbit, decreased from 127.6% to 99.79% ( p p Conclusion Our surgical strategies using the jigsaw puzzle and individual reconstruction technique provide accurate restoration of combined orbital floor and medial wall fractures.
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The accuracy of patient specific implant prebented with 3D-printed rapid Prototype Model for orbital wall reconstruction
Journal of Cranio-maxillofacial Surgery, 2017Co-Authors: Young Chul Kim, Woo Shik Jeong, Kyung S Koh, Jong Woo Choi, Tae-kyung Park, Tae Suk OhAbstract:Abstract Background This study evaluated the accuracy of blow out fracture reduction using 3D-printed rapid prototyping (RP) skull Modeling. Patients and methods Retrospective review was performed for 82 patients who underwent post-traumatic orbital wall fracture reduction between 2012 and 2014. Patients were divided into two groups according to the use of 3D-printed RP skull Model reproduced by mirroring technique, onto which a titanium mesh was anatomically molded. Using computed tomographic scans, the areas of pre- and post-operative orbital wall defect, the layout angles of the titanium mesh, and the gap lengths between the implant and fracture margin were compared between the two groups. Results Of the 82 patients identified, 46 and 36 were diagnosed with medial and inferior orbital wall fractures, respectively. Bone defect area of the RP group was significantly reduced in comparison with that of the conventional group (8.03 ± 3.5% versus 18.7 ± 15.41% for medial wall fractures, 7.14 ± 5.74% versus 12.8 ± 4.92% for inferior wall fractures, respectively, p p Conclusions More accurate restoration of traumatic orbital wall fractures can be achieved using patient-specific 3D-printed RP skull Models.
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customized orbital wall reconstruction using three dimensionally printed rapid Prototype Model in patients with orbital wall fracture
Journal of Craniofacial Surgery, 2016Co-Authors: Woo Shik Jeong, Taik Jin Chang, Kyung S Koh, Jong Woo ChoiAbstract:Background It is difficult to restore original orbital contours because of their complex 3-dimensional structure. Moreover, slight implant malpositioning can result in enophthalmos or other complications. The authors describe our experience of using individualized prebent titanium-Medpor mesh implants and stereolithographic Modeling in a series of patients who underwent orbital wall reconstruction. Methods A consecutive series of 104 patients with orbital fractures received computer simulation-designed prebent titanium-Medpor mesh implants insertion. Preoperative computed tomography (CT) data were processed for each patient, and a rapid prototyping (RP) Model was produced. The uninjured side was concurrently mirrored and superimposed onto the traumatized side to create a mirror image of the RP Model. The authors fabricated the titanium-Medpor implants to intraoperatively reconstruct the 3-dimensional orbital structure. The prefabricated titanium-Medpor implants were inserted into the defective orbital wall and fixed. Postoperative CT images were immediately taken to evaluate the reconstructed contours and compare the preoperative and postoperative intraorbital volumes. Results All reconstructions were successful without postoperative complications. The implants were correctly positioned in the sagittal, axial, and coronal planes relative to the original orbital contours. The mean preoperative intraorbital volumes of the uninjured and traumatized sides were 21.39 ± 1.93 and 23.17 ± 2.00 cm, respectively, and the postoperative mean intraorbital volume was 20.74 ± 2.07 cm. Conclusions Orbital reconstruction can be optimized using individually manufactured rapid Prototype skull Model and premolded synthetic scaffold by computer-aid of mirroring-reconstruction of 3-dimensional images and 3-dimensional printing techniques.
W N Fu - One of the best experts on this subject based on the ideXlab platform.
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a novel magnetic levitated bearing system for vertical axis wind turbines vawt
Applied Energy, 2012Co-Authors: Jan Kumbernuss, Chen Jian, Junhua Wang, Hongxing Yang, W N FuAbstract:In this report, a novel magnetic levitated bearing suitable for Vertical Axis Wind Turbines (VAWT) is introduced, fabricated and tested. The bearing system generates a magnetic force, which can support the weight of the wind turbine rotor. A Finite Element Method (FEM) simulation shows how low the torque of this bearing is. A small scale Prototype Model of this novel magnetic levitated bearing system was constructed and tested successfully. The test results show how low the torque of this novel bearing is.
