The Experts below are selected from a list of 26007 Experts worldwide ranked by ideXlab platform
Euiseong Kim - One of the best experts on this subject based on the ideXlab platform.
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Computer-aided Design/Computer-aided Manufacturing-guided Endodontic Surgery: Guided Osteotomy and Apex Localization in a Mandibular Molar with a Thick Buccal Bone Plate.
Journal of Endodontics, 2018Co-Authors: So Yeon Ahn, Namhoon Kim, Sunil Kim, Bekir Karabucak, Euiseong KimAbstract:Abstract A mandibular molar with a thick buccal Bone Plate is a challenging problem in endodontic surgery despite the increase in the success rate of endodontic surgery nowadays. This report describes the application of a surgical temPlate to guide osteotomy and facilitate apex localization in a mandibular molar with a thick buccal Bone Plate. A 57-year-old woman visited the authors’ clinic for pain in tooth 19 and was diagnosed with symptomatic apical periodontitis in this previously treated tooth. Nonsurgical retreatment was performed; however, 2 years later, the patient reported pain in the same tooth. A periapical lesion was confirmed using cone-beam computed tomographic (CBCT) imaging, and endodontic surgery on the mesial root of tooth 19 was planned. After CBCT imaging and cast scan data were transferred to implant surgical planning software, the data were superimposed. In the superimposed model, an anchor pin was designed to target the mesial root apex of tooth 19. The surgical temPlate was then printed using a 3-dimensional printer. Endodontic microsurgery included application of this printed surgical temPlate. A computer-aided design/computer-aided manufacturing (CAD/CAM)-guided surgical temPlate minimized the extent of osteotomy and enabled precise targeting of the apex in this case. There were no postoperative complications. A CAD/CAM-guided surgical temPlate is useful in endodontic surgery for complicated cases.
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computer aided design computer aided manufacturing guided endodontic surgery guided osteotomy and apex localization in a mandibular molar with a thick buccal Bone Plate
Journal of Endodontics, 2018Co-Authors: So Yeon Ahn, Namhoon Kim, Sunil Kim, Bekir Karabucak, Euiseong KimAbstract:Abstract A mandibular molar with a thick buccal Bone Plate is a challenging problem in endodontic surgery despite the increase in the success rate of endodontic surgery nowadays. This report describes the application of a surgical temPlate to guide osteotomy and facilitate apex localization in a mandibular molar with a thick buccal Bone Plate. A 57-year-old woman visited the authors’ clinic for pain in tooth 19 and was diagnosed with symptomatic apical periodontitis in this previously treated tooth. Nonsurgical retreatment was performed; however, 2 years later, the patient reported pain in the same tooth. A periapical lesion was confirmed using cone-beam computed tomographic (CBCT) imaging, and endodontic surgery on the mesial root of tooth 19 was planned. After CBCT imaging and cast scan data were transferred to implant surgical planning software, the data were superimposed. In the superimposed model, an anchor pin was designed to target the mesial root apex of tooth 19. The surgical temPlate was then printed using a 3-dimensional printer. Endodontic microsurgery included application of this printed surgical temPlate. A computer-aided design/computer-aided manufacturing (CAD/CAM)-guided surgical temPlate minimized the extent of osteotomy and enabled precise targeting of the apex in this case. There were no postoperative complications. A CAD/CAM-guided surgical temPlate is useful in endodontic surgery for complicated cases.
Magdalena Müller-gerbl - One of the best experts on this subject based on the ideXlab platform.
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Density and strength distribution in the human subchondral Bone Plate of the patella.
International Orthopaedics, 2012Co-Authors: Sebastian Hoechel, Dieter Wirz, Magdalena Müller-gerblAbstract:Purpose The aim of this study was to map the strength distribution of the human patella and correlate it to the subchondral Bone Plate density obtained by means of computed tomographyosteoabsorptiometry (CT-OAM).
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Mineralisation and mechanical strength of the glenoid cavity subchondral Bone Plate.
International Orthopaedics, 2011Co-Authors: Marko Kraljević, Valentin Zumstein, Rolf Hügli, Dieter Wirz, Magdalena Müller-gerblAbstract:Purpose Failures in total shoulder replacements are often due to aseptic loosening of the glenoid component; the subchondral Bone Plate is an important factor governing primary fixation of implant materials. Therefore, we investigated characteristic mineralisation patterns of the subchondral Bone Plate, which demonstrate long-term stress on articular surfaces, age-related changes, postsurgical biomechanical situations and regions of fixation. Using computed tomography osteo-absorptiometry (CT-OAM), these distribution patterns can be demonstrated in vivo. The aim of this study was to investigate the relationship between subchondral Bone-Plate mineralisation measured with CT-OAM and the mechanical strength measured by indentation.
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Mineralisation patterns in the subchondral Bone Plate of the humeral head
Surgical and Radiologic Anatomy, 2011Co-Authors: Valentin Zumstein, Marko Kraljević, Rolf Huegli, Magdalena Müller-gerblAbstract:Purpose Pathologic changes of the glenohumeral joint, like a long-standing overloading or an accident often lead to severe glenohumeral osteoarthritis, and a glenohumeral joint replacement could be necessary. Joint instability and glenoid loosening are the most common post-operative complications, which can be caused by eccentric loading of the glenoid, if the humeral head is malcentered. If these malcentered cases could be identified pre-operatively, the pathologic position of the humeral head could be fixed intra-operatively and complication may be prevented. Computed tomography osteoabsorptiometry (CT-OAM) is a useful method to determine the distribution of mineralisation in the subchondral Bone as a marker for the long-term loading history of a joint. The objective of this study was to gain information about the mineralisation distribution in the subchondral Bone Plate of the humeral head.
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Mineralisation and mechanical strength of the subchondral Bone Plate of the inferior tibial facies
Surgical and Radiologic Anatomy, 2009Co-Authors: H. Mühlhofer, Y. Ercan, S. Drews, M. Matsuura, J. Meissner, U. Linsenmaier, R. Putz, Magdalena Müller-gerblAbstract:Background The implantation of total ankle prosthesis is one of the most challenging operations in orthopaedic surgery. The main problem that surgeons face is the fixation of the total ankle prosthesis on the tibial side. The subchondral Bone Plate of the distal tibia is considered the strongest region on the inferior tibial facies. Based on information about the mineralisation of the subchondral Bone Plate, conclusions can be made concerning the mechanical stress, age-related changes, post-surgical biomechanical situations and regions of fixation. The aim of this study was to determine the correlation between the mineralisation of the subchondral Bone Plate and the topical mechanical strength. Methods By means of CT-osteoabsorptiometry, the distribution of mineralisation in the subchondral Bone Plate in 18 distal Tibiae was investigated. After removal of the cartilage of the facies articularis inferior, the mechanical strength of the joint surface was measured with an indentation apparatus. The linear regression of the mineralisation density and the maximal mechanical strength to penetrate the subchondral Bone Plate was determined. Results Our data showed a coefficient of determination between 0.75 and 0.97 and a coefficient of correlation between 0.86 and 0.97. The T test showed significance ( P
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Mineralisation and mechanical strength of the subchondral Bone Plate of the inferior tibial facies.
Surgical and Radiologic Anatomy, 2008Co-Authors: H. Mühlhofer, Y. Ercan, S. Drews, M. Matsuura, J. Meissner, U. Linsenmaier, R. Putz, Magdalena Müller-gerblAbstract:The implantation of total ankle prosthesis is one of the most challenging operations in orthopaedic surgery. The main problem that surgeons face is the fixation of the total ankle prosthesis on the tibial side. The subchondral Bone Plate of the distal tibia is considered the strongest region on the inferior tibial facies. Based on information about the mineralisation of the subchondral Bone Plate, conclusions can be made concerning the mechanical stress, age-related changes, post-surgical biomechanical situations and regions of fixation. The aim of this study was to determine the correlation between the mineralisation of the subchondral Bone Plate and the topical mechanical strength. By means of CT-osteoabsorptiometry, the distribution of mineralisation in the subchondral Bone Plate in 18 distal Tibiae was investigated. After removal of the cartilage of the facies articularis inferior, the mechanical strength of the joint surface was measured with an indentation apparatus. The linear regression of the mineralisation density and the maximal mechanical strength to penetrate the subchondral Bone Plate was determined. Our data showed a coefficient of determination between 0.75 and 0.97 and a coefficient of correlation between 0.86 and 0.97. The T test showed significance (P
So Yeon Ahn - One of the best experts on this subject based on the ideXlab platform.
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Computer-aided Design/Computer-aided Manufacturing-guided Endodontic Surgery: Guided Osteotomy and Apex Localization in a Mandibular Molar with a Thick Buccal Bone Plate.
Journal of Endodontics, 2018Co-Authors: So Yeon Ahn, Namhoon Kim, Sunil Kim, Bekir Karabucak, Euiseong KimAbstract:Abstract A mandibular molar with a thick buccal Bone Plate is a challenging problem in endodontic surgery despite the increase in the success rate of endodontic surgery nowadays. This report describes the application of a surgical temPlate to guide osteotomy and facilitate apex localization in a mandibular molar with a thick buccal Bone Plate. A 57-year-old woman visited the authors’ clinic for pain in tooth 19 and was diagnosed with symptomatic apical periodontitis in this previously treated tooth. Nonsurgical retreatment was performed; however, 2 years later, the patient reported pain in the same tooth. A periapical lesion was confirmed using cone-beam computed tomographic (CBCT) imaging, and endodontic surgery on the mesial root of tooth 19 was planned. After CBCT imaging and cast scan data were transferred to implant surgical planning software, the data were superimposed. In the superimposed model, an anchor pin was designed to target the mesial root apex of tooth 19. The surgical temPlate was then printed using a 3-dimensional printer. Endodontic microsurgery included application of this printed surgical temPlate. A computer-aided design/computer-aided manufacturing (CAD/CAM)-guided surgical temPlate minimized the extent of osteotomy and enabled precise targeting of the apex in this case. There were no postoperative complications. A CAD/CAM-guided surgical temPlate is useful in endodontic surgery for complicated cases.
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computer aided design computer aided manufacturing guided endodontic surgery guided osteotomy and apex localization in a mandibular molar with a thick buccal Bone Plate
Journal of Endodontics, 2018Co-Authors: So Yeon Ahn, Namhoon Kim, Sunil Kim, Bekir Karabucak, Euiseong KimAbstract:Abstract A mandibular molar with a thick buccal Bone Plate is a challenging problem in endodontic surgery despite the increase in the success rate of endodontic surgery nowadays. This report describes the application of a surgical temPlate to guide osteotomy and facilitate apex localization in a mandibular molar with a thick buccal Bone Plate. A 57-year-old woman visited the authors’ clinic for pain in tooth 19 and was diagnosed with symptomatic apical periodontitis in this previously treated tooth. Nonsurgical retreatment was performed; however, 2 years later, the patient reported pain in the same tooth. A periapical lesion was confirmed using cone-beam computed tomographic (CBCT) imaging, and endodontic surgery on the mesial root of tooth 19 was planned. After CBCT imaging and cast scan data were transferred to implant surgical planning software, the data were superimposed. In the superimposed model, an anchor pin was designed to target the mesial root apex of tooth 19. The surgical temPlate was then printed using a 3-dimensional printer. Endodontic microsurgery included application of this printed surgical temPlate. A computer-aided design/computer-aided manufacturing (CAD/CAM)-guided surgical temPlate minimized the extent of osteotomy and enabled precise targeting of the apex in this case. There were no postoperative complications. A CAD/CAM-guided surgical temPlate is useful in endodontic surgery for complicated cases.
Mumin Kucuk - One of the best experts on this subject based on the ideXlab platform.
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evaluation of Bone Plate with low stiffness material in terms of stress distribution
Journal of Biomechanics, 2008Co-Authors: Semih Benli, Sami Aksoy, Hasan Havitcioglu, Mumin KucukAbstract:The aim of this study is to evaluate a newly developed Bone Plate with low-stiffness material in terms of stress distribution. In this numerical study, 3D finite element models of the Bone Plate with low-stiffness material and traditional Bone Plates made of stainless steel and Ti alloy have been developed by using the ANSYS software. Stress analyses have been carried out for all three models under the same loading and boundary conditions. Compressive stresses occurring in the intact portion of the Bone (tibia) and at the fractured interface at different stages of Bone healing have been investigated for all three types of Bone-Plate systems. The results obtained have been compared and presented in graphs. It has been seen that the Bone Plate with low-stiffness material offers less stress-shielding to the Bone, providing a higher compressive stress at the fractured interface to induce accelerated healing in comparison with Ti alloy and stainless-steel Bone Plate. In addition, the effects of low-stiffness materials with different Young's modulus on stress distribution at the fractured interface have been investigated in the newly developed Bone-Plate system. The results showed that when a certain value of Young's modulus of low-stiffness material is exceeded, increase in stiffness of the Bone Plate does not occur to a large extent and stress distributions and micro-motions at the fractured interface do not change considerably.
Habiba Bougherara - One of the best experts on this subject based on the ideXlab platform.
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on optimization of a composite Bone Plate using the selective stress shielding approach
Journal of The Mechanical Behavior of Biomedical Materials, 2015Co-Authors: Saeid Samiezadeh, Pouria Tavakkoli Avval, Zouheir Fawaz, Habiba BougheraraAbstract:Abstract Bone fracture Plates are used to stabilize fractures while allowing for adequate compressive force on the fracture ends. Yet the high stiffness of conventional Bone Plates significantly reduces compression at the fracture site, and can lead to subsequent Bone loss upon healing. Fibre-reinforced composite Bone Plates have been introduced to address this drawback. However, no studies have optimized their configurations to fulfill the requirements of proper healing. In the present study, classical laminate theory and the finite element method were employed for optimization of a composite Bone Plate. A hybrid composite made of carbon fibre/epoxy with a flax/epoxy core, which was introduced previously, was optimized by varying the laminate stacking sequence and the contribution of each material, in order to minimize the axial stiffness and maximize the torsional stiffness for a given range of bending stiffness. The initial 14×4 14 possible configurations were reduced to 13 after applying various design criteria. A comprehensive finite element model, validated against a previous experimental study, was used to evaluate the mechanical performance of each composite configuration in terms of its fracture stability, load sharing, and strength in transverse and oblique Vancouver B1 fracture configurations at immediately post-operative, post-operative, and healed Bone stages. It was found that a carbon fibre/epoxy Plate with an axial stiffness of 4.6 MN, and bending and torsional stiffness of 13 and 14 N·m 2 , respectively, showed an overall superiority compared with other laminate configurations. It increased the compressive force at the fracture site up to 14% when compared to a conventional metallic Plate, and maintained fracture stability by ensuring the fracture fragments’ relative motions were comparable to those found during metallic Plate fixation. The healed stage results revealed that implantation of the titanium Plate caused a 40.3% reduction in Bone stiffness, while the composite Plate lowered the stiffness by 32.9% as compared to the intact femur. This study proposed a number of guidelines for the design of composite Bone Plates. The findings suggest that a composite Bone Plate could be customized to allow for moderate compressive force on the fracture ends, while remaining relatively rigid in bending and torsion and strong enough to withstand external loads when a fracture gap is present. The results indicate that the proposed composite Bone Plate could be a potential candidate for Bone fracture Plate applications.
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biomechanical properties of an advanced new carbon flax epoxy composite material for Bone Plate applications
Journal of The Mechanical Behavior of Biomedical Materials, 2013Co-Authors: Zahra S Bagheri, Ihab El Sawi, Emil H Schemitsch, Rad Zdero, Habiba BougheraraAbstract:Abstract This work is part of an ongoing program to develop a new carbon fiber/flax/epoxy (CF/flax/epoxy) hybrid composite material for use as an orthopaedic long Bone fracture Plate, instead of a metal Plate. The purpose of this study was to evaluate the mechanical properties of this new novel composite material. The composite material had a “sandwich structure”, in which two thin sheets of CF/epoxy were attached to each outer surface of the flax/epoxy core, which resulted in a unique structure compared to other composite Plates for Bone Plate applications. Mechanical properties were determined using tension, three-point bending, and Rockwell hardness tests. Also, scanning electron microscopy (SEM) was used to characterize the failure mechanism of specimens in tension and three-point bending tests. The results of mechanical tests revealed a considerably high ultimate strength in both tension (399.8 MPa) and flexural loading (510.6 MPa), with a higher elastic modulus in bending tests (57.4 GPa) compared to tension tests (41.7 GPa). The composite material experienced brittle catastrophic failure in both tension and bending tests. The SEM images, consistent with brittle failure, showed mostly fiber breakage and fiber pull-out at the fractured surfaces with perfect bonding at carbon fibers and flax plies. Compared to clinically-used orthopaedic metal Plates, current CF/flax/epoxy results were closer to human cortical Bone, making the material a potential candidate for use in long Bone fracture fixation.