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https://www.readbyqxmd.com/read/28548998/zygomaticomaxillary-complex-fractures-diagnosis-and-treatment
#1
Nicholas Peretti, Stephen MacLeod
PURPOSE OF REVIEW: To provide an overview of zygomaticomaxillary complex (ZMC) fractures and their treatment. Aspects of anatomy, diagnosis, and treatment objectives of these common fractures will be reviewed including recent literature. RECENT FINDINGS: Advances in technology such as guided surgery have allowed for better outcomes and a reduction in surgeon variability with regard to postoperative results. The use of titanium and bioresorbable mini screws and plates have expanded the ability to achieve stable and predictable results...
May 25, 2017: Current Opinion in Otolaryngology & Head and Neck Surgery
https://www.readbyqxmd.com/read/28530387/three-dimensional-dendritic-structures-of-nicomo-as-efficient-electrocatalysts-for-the-hydrogen-evolution-reaction
#2
Di Gao, Jiangna Guo, Xun Cui, Lin Yang, Yang Yang, Huichao He, Peng Xiao, Yunhuai Zhang
Earth-abundant first-row (3d) transition-metal-based catalysts such as bimetallic Ni-Co represent an emerging class of electrocatalysts for HER, but they operate at overpotentials significantly above thermodynamic requirements. Here we doped NiCo catalyst with non-3d metals molybdenum (Mo) for improvement in catalyzing the hydrogen evolution reaction. The ternary catalyst was readily obtained by a one-pot process via the sequential electrodeposition of Ni, Co and Mo precursors on titanium (Ti) support. By tailing the deposition conditions we fabricated NiCoMo catalysts with three-dimensional dendritic structures, exhibiting large amounts of electrochemically active sites...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28512008/3d-printing-and-modelling-of-customized-implants-and-surgical-guides-for-non-human-primates
#3
Xing Chen, Jessy K Possel, Catherine Wacongne, Anne F van Ham, P Christiaan Klink, Pieter R Roelfsema
BACKGROUND: Primate neurobiologists use chronically implanted devices such as pedestals for head stabilization and chambers to gain access to the brain and study its activity. Such implants are skull-mounted, and made from a hard, durable material, such as titanium. NEW METHOD: Here we present a low-cost method of creating customized 3D-printed cranial implants that are tailored to the anatomy of individual animals. We performed pre-surgical computed tomography (CT) and magnetic resonance (MR) scans to generate three-dimensional (3D) models of the skull and brain...
May 13, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28507870/intraoperative-change-in-defect-size-during-maxillary-reconstruction-using-surgical-guides-created-by-cad-cam
#4
Daiki Morita, Toshiaki Numajiri, Hiroko Nakamura, Shoko Tsujiko, Yoshihiro Sowa, Makoto Yasuda, Shigeru Hirano
Surgical osteotomy guides created by computer-aided design/computer-aided manufacturing (CAD/CAM) have been developed and are now widely used in maxillofacial reconstruction. However, there are no standard procedures for dealing with an intraoperative change in defect size. We report on a case in which we used our CAD/CAM guides to deal with an intraoperative change in defect size in a maxillary reconstruction. We planned the maxillary reconstruction using a free fibula flap because of left maxillary sinus cancer in a 73-year-old man...
April 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28481392/customised-cranioplasty-implant-for-decompressive-craniectomy-patients-a-technical-note
#5
Kaif Mohammad
Cranioplasty is a commonly performed procedure following decompressive craniectomy. The patients are usually young earning persons and increasing cost of treatment is difficult to bear especially in low and middle income countries. A variety of options are available for cranioplasty ranging from autologus bone graft to xenograft and synthetic materials. Presently the autologous cryopreserved or subcutaneously preserved bone graft is considered as preferred choice but is has its drawback of bone resorption and infection ...
March 25, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28474182/homogenous-scaffold-based-cranial-skull-implant-modelling-and-structural-analysis-unit-cell-algorithm-meshless-approach
#6
V Phanindra Bogu, Y Ravi Kumar, Asit Kumar Khanra
This computational study explores a unique modelling approach of the cranial implant, homogenous scaffold algorithm and meshless method, respectively. This meshless method is employed to review the implant underneath intracranial pressure (ICP) conditions with a standard ICP range of 7 mm of Hg to 15 mm of Hg. The algorithm is used to introduce uniform porosity within the implant enabling the implant behaviour with respect to ICP conditions. However, increase in the porosity leads to variation in deformation and equivalent stress, respectively...
May 5, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28434826/the-accuracy-of-patient-specific-implant-prebented-with-3d-printed-rapid-prototype-model-for-orbital-wall-reconstruction
#7
Young Chul Kim, Woo Shik Jeong, Tae-Kyung Park, Jong Woo Choi, Kyung S Koh, Tae Suk Oh
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...
March 27, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28427837/in-vitro-fatigue-tests-and-in-silico-finite-element-analysis-of-dental-implants-with-different-fixture-abutment-joint-types-using-computer-aided-design-models
#8
Satoshi Yamaguchi, Yasufumi Yamanishi, Lucas S Machado, Shuji Matsumoto, Nick Tovar, Paulo G Coelho, Van P Thompson, Satoshi Imazato
PURPOSE: The aim of this study was to evaluate fatigue resistance of dental fixtures with two different fixture-abutment connections by in vitro fatigue testing and in silico three-dimensional finite element analysis (3D FEA) using original computer-aided design (CAD) models. METHODS: Dental implant fixtures with external connection (EX) or internal connection (IN) abutments were fabricated from original CAD models using grade IV titanium and step-stress accelerated life testing was performed...
April 17, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28409959/systematic-fuel-cavity-asymmetries-in-directly-driven-inertial-confinement-fusion-implosions
#9
R C Shah, B M Haines, F J Wysocki, J F Benage, J A Fooks, V Glebov, P Hakel, M Hoppe, I V Igumenshchev, G Kagan, R C Mancini, F J Marshall, D T Michel, T J Murphy, M E Schoff, K Silverstein, C Stoeckl, B Yaakobi
We present narrow-band self-emission x-ray images from a titanium tracer layer placed at the fuel-shell interface in 60-laser-beam implosion experiments at the OMEGA facility. The images are acquired during deceleration with inferred convergences of ∼9-14. Novel here is that a systematically observed asymmetry of the emission is linked, using full sphere 3D implosion modeling, to performance-limiting low mode asymmetry of the drive.
March 31, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28397164/comparison-of-effects-of-different-screw-materials-in-the-triangle-fixation-of-femoral-neck-fractures
#10
Kadir Gok, Sermet Inal, Arif Gok, Eyyup Gulbandilar
In this study, biomechanical behaviors of three different screw materials (stainless steel, titanium and cobalt-chromium) have analyzed to fix with triangle fixation under axial loading in femoral neck fracture and which material is best has been investigated. Point cloud obtained after scanning the human femoral model with the three dimensional (3D) scanner and this point cloud has been converted to 3D femoral model by Geomagic Studio software. Femoral neck fracture was modeled by SolidWorks software for only triangle configuration and computer-aided numerical analyses of three different materials have been carried out by AnsysWorkbench finite element analysis (FEA) software...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28392810/effect-of-exposure-parameters-on-metal-artifacts-in-cone-beam-computed-tomography
#11
Mehrdad Panjnoush, Yasaman Kheirandish, Pooneh Mohseni Kashani, Hoorieh Bashizadeh Fakhar, Farzan Younesi, Maysa Mallahi
OBJECTIVES: The aim of this study was to assess the effect of tube current, kilovoltage peak (kVp), metal type, and the position of metal objects on metal artifacts in cone-beam computed tomography (CBCT) images. MATERIALS AND METHODS: Titanium and cobalt-chromium rods were fabricated and placed in a dry human mandible. Samples were scanned using a Promax 3D CBCT unit with different milli-amperages and kVp. The artifacts induced by metal objects were evaluated using the Image J software in four regions of interest (ROIs) on each image...
June 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28370595/three-dimensional-nickel-borate-nanosheets-array-for-efficient-oxygen-evolution-at-near-neutral-ph
#12
Ruixiang Ge, Xiang Ren, Fengli Qu, Danni Liu, Min Ma, Shuai Hao, Gu Du, Abdullah M Asiri, Liang Chen, Xuping Sun
Nickel-borate nanosheets array on titanium mesh (Ni-Bi NA/TM) was derived from NiSe2 nanosheets array on titanium mesh (NiSe2 NA/TM) by electrochemical transformation. As a three-dimensional electrode, Ni-Bi NA/TM exhibited high catalytic activity toward the oxygen evolution reaction and required a low overpotential of 430 mV at 10 mA cm(-2) in 0.1 m potassium borate (pH 9.2), with outstanding long-term stability and high turnover frequency.
May 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28358508/cr0-5nb24-5o62-nanowires-with-high-electronic-conductivity-for-high-rate-and-long-life-lithium-ion-storage
#13
Chao Yang, Shu Yu, Chunfu Lin, Fan Lv, Shunqing Wu, Yong Yang, Wei Wang, Zi-Zhong Zhu, Jianbao Li, Ning Wang, Shaojun Guo
Intercalation-type TiNbxO2+2.5x (x = 2, 5, and 24) anode materials have recently become more interesting for lithium-ion batteries (LIBs) due to their large theoretical capacities of 388-402 mAh g(-1). However, the Ti(4+)/Nb(5+) ions in TiNbxO2+2.5x with empty 3d/4d orbitals usually lead to extremely low electronic conductivity of <10(-9) S cm(-1), greatly restricting their practical capacity and rate capability. Herein, we report a class of highly conductive Cr0.5Nb24.5O62 nanowires as an intercalation-type anode material for high-performance LIBs...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350023/topochemical-synthesis-and-photocatalytic-activity-of-3d-hierarchical-batio3-microspheres-constructed-from-crystal-axis-oriented-nanosheets
#14
Chang-Ke Chen, Shi-Xi Zhao, Qian-Long Lu, Kai Luo, Xi-Hui Zhang, Ce-Wen Nan
Novel BaTiO3 hierarchical porous microspheres were achieved by using H2Ti2O5·H2O (HTO) hierarchical microspheres as a precursor template via a facile solvothermal method. Interestingly, the BaTiO3 microspheres were constructed with two-dimensional (2D) nanosheets, which were composed of many order nanocrystals with crystal-axis-orientation. The special hierarchical structure, which is both macroporous and mesoporous, exhibits a large specific surface area and a high total pore volume. The photocatalytic performance of BaTiO3 hierarchical microspheres for degradation of methyl orange (MO) under UV-light irradiation was tested, its apparent rate being up to 0...
April 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28338421/harnessing-the-osteogenicity-of-in-vitro-stem-cell-derived-mineralized-extracellular-matrix-as-3d-biotemplate-to-guide-bone-regeneration
#15
Yoke Chin Chai, Johanna Bolander, Ioannis Papantoniou, Jennifer Patterson, Jef Vleugels, Jan Schrooten, Frank P Luyten
Advanced biomaterials that are capable of guiding robust bone regeneration are highly demanded for translational therapy of bone defects or bone augmentation in clinics. One of the strategic approaches is to produce tissue engineering (TE) constructs that mediate bone regeneration by recapitulating the natural bone formation or healing process. In this study, we aimed at producing devitalized mineralized carriers with augmented bone forming capacity via a modified culture protocol (i.e., culture conditions with high calcium and/or phosphate concentrations) that first promotes cell growth and, subsequently, mineralized extracellular matrix (ECM) deposition by human periosteum-derived osteoprogenitor cells (hPDCs) on additive manufactured three-dimensional (3D) porous titanium (Ti)-based scaffolds...
March 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28321991/atomic-layer-deposition-of-a-silver-nanolayer-on-advanced-titanium-orthopedic-implants-inhibits-bacterial-colonization-and-supports-vascularized-de-novo-bone-ingrowth
#16
Aine Devlin-Mullin, Naomi M Todd, Zahra Golrokhi, Hua Geng, Moritz A Konerding, Nigel G Ternan, John A Hunt, Richard J Potter, Chris Sutcliffe, Eric Jones, Peter D Lee, Christopher A Mitchell
Joint replacement surgery is associated with significant morbidity and mortality following infection with either methicillin-resistant Staphylococcus aureus (MRSA) or Staphylococcus epidermidis. These organisms have strong biofilm-forming capability in deep wounds and on prosthetic surfaces, with 10(3) -10(4) microbes resulting in clinically significant infections. To inhibit biofilm formation, we developed 3D titanium structures using selective laser melting and then coated them with a silver nanolayer using atomic layer deposition...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28318927/classical-versus-custom-orbital-wall-reconstruction-selected-factors-regarding-surgery-and-hospitalization
#17
Rafał Zieliński, Marta Malińska, Marcin Kozakiewicz
PURPOSE: Nowadays, in orbital wall reconstruction, maxillofacial surgeons have the possibility to treat patients in modern ways such as with individual implants. Nevertheless, conventional treatment including standard titanium mesh shaped during the surgical procedure is also widely used. The aim of this study was to compare the above methods of orbital wall reconstructions. MATERIALS AND METHODS: In the first group (39 cases), patients were treated by means of computer-aided design/computer-aided manufacturing (CAD/CAM) milled individual implants made of ultra-high-molecular-weight polyethylene, dioxide zirconium and rapid prototyping titanium mesh pre-bent on an ABS model made by a three-dimensional (3D) printer...
February 17, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28299273/guidelines-for-patient-specific-jawline-definition-with-titanium-implants-in-esthetic-deformity-and-malformation-surgery
#18
Maurice Yves Mommaerts
CONTEXT: Asymmetry and unfavorable esthetics of the jawline have become possible to correct in three dimensions using computer aided design and computer aided manufacturing. AIMS: The aim of this study was to provide esthetic, technical, and operative guidelines for mandibular angle and border augmentation using patient-specific titanium implants made by selective laser melting. SETTINGS AND DESIGN: University hospital - prospective registry...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28274480/use-of-intraoral-scanning-and-3-dimensional-printing-in-the-fabrication-of-a-removable-partial-denture-for-a-patient-with-limited-mouth-opening
#19
Jiang Wu, Yan Li, Yumei Zhang
BACKGROUND AND OVERVIEW: When treating patients with severely limited mouth openings, it is difficult for the dentist to obtain an impression and fabricate a removable partial denture (RPD) by using traditional methods. Intraoral scanning, computer-aided design, and 3-dimensional (3D) printing have provided alternative methods for fabricating dental prostheses. CASE DESCRIPTION: The authors present a case in which they aimed to improve the efficiency and quality of fabricating an RPD framework by integrating the technologies of intraoral scanning, computer-aided design, and 3D printing...
May 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28268334/a-pmma-microfluidic-dielectric-sensor-for-blood-coagulation-monitoring-at-the-point-of-care
#20
Debnath Maji, Michael A Suster, Erdem Kucukal, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni
This paper describes the design and construct of a fully biocompatible, microfluidic, dielectric sensor targeted at monitoring human whole blood coagulation at the point-of-care (POC). The sensor assembly procedure involves using sputtered electrodes in a microfluidic channel with a physiologically relevant height of 50μm to create a three-dimensional (3D), parallel-plate, capacitive sensing area. The sensor is constructed with biocompatible materials of polymethyl methacrylate (PMMA) for the substrate and titanium nitride (TiN) for the sensing and floating electrodes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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