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https://www.readbyqxmd.com/read/29457442/-development-and-application-of-artificial-vertebral-body
#1
REVIEW
Jian-Tao Liu, Feng Zhang, Zheng-Chao Gao, Bin-Bin Niu, Yu-Huan Li, Xi-Jing He
Artificial vertebral body has achieved good results in treating spinal tumors, tuberculosis, fracture and other diseases. Currently, artificial vertebral body with variety of kinds and pros and cons, is generally divided into two types: fusion type and movable type. The former according to whether the height could be adjusted and strength of self-stability is divided into three types: support-fixed type, adjust-fixed type and self-fixed type. Whether the height of self-fixed type could be adjusted is dependent on structure of collar thread rotation...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29429672/effect-of-employing-ultrasonic-waves-during-pulse-electrochemical-deposition-on-the-characteristics-and-biocompatibility-of-calcium-phosphate-coatings
#2
Leila Fathyunes, Jafar Khalil-Allafi
In the present work, we investigated the effect of employing ultrasonic waves during pulse electrochemical deposition on surface topography, chemical composition and biocompatibility of calcium phosphate (Ca-P) coatings. The SEM and 3D AFM images showed that the anodized titanium surface was covered with the uniform and refined size of plate-like Ca-P crystals, when the ultrasonic treatment of the electrolyte with power of 60 W was carried out during deposition. In contrast, for the Ca-P; 0 W coating applied under only the magnetic stirring of the electrolyte, the microstructure was non-uniform and some Ca-P crystals with the larger size were randomly observed in different regions, causing a rougher surface...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29426786/effect-of-feldspathic-porcelain-layering-on-the-marginal-fit-of-zirconia-and-titanium-complete-arch-fixed-implant-supported-frameworks
#3
Burak Yilmaz, Faris A Alshahrani, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Veneering with porcelain may adversely affect the marginal fit of long-span computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported fixed prostheses. Moreover, data regarding the precision of fit of CAD-CAM-fabricated implant-supported complete zirconia fixed dental prostheses (FDPs) before and after porcelain layering are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of porcelain layering on the marginal fit of CAD-CAM-fabricated complete-arch implant-supported, screw-retained FDPs with presintered zirconia frameworks compared with titanium...
February 6, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29414982/laser-additive-manufacturing-of-3d-meshes-for-optical-applications
#4
Khamis Essa, Aydin Sabouri, Haider Butt, Fawzia Hamed Basuny, Mootaz Ghazy, Mahmoud Ahmed El-Sayed
Selective laser melting (SLM) is a widely used additive manufacturing process that can be used for printing of intricate three dimensional (3D) metallic structures. Here we demonstrate the fabrication of titanium alloy Ti-6Al-4V alloy based 3D meshes with nodally-connected diamond like unit cells, with lattice spacing varying from 400 to 1000 microns. A Concept Laser M2 system equipped with laser that has a wavelength of 1075 nm, a constant beam spot size of 50μm and maximum power of 400W was used to manufacture the 3D meshes...
2018: PloS One
https://www.readbyqxmd.com/read/29414477/effect-of-porous-orthopaedic-implant-material-and-structure-on-load-sharing-with-simulated-bone-ingrowth-a-finite-element-analysis-comparing-titanium-and-peek
#5
R Dana Carpenter, Brett S Klosterhoff, F Brennan Torstrick, Kevin T Foley, J Kenneth Burkus, Christopher S D Lee, Ken Gall, Robert E Guldberg, David L Safranski
Osseointegration of load-bearing orthopaedic implants, including interbody fusion devices, is critical to long-term biomechanical functionality. Mechanical loads are a key regulator of bone tissue remodeling and maintenance, and stress-shielding due to metal orthopaedic implants being much stiffer than bone has been implicated in clinical observations of long-term bone loss in tissue adjacent to implants. Porous features that accommodate bone ingrowth have improved implant fixation in the short term, but long-term retrieval studies have sometimes demonstrated limited, superficial ingrowth into the pore layer of metal implants and aseptic loosening remains a problem for a subset of patients...
January 30, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29411972/3d-fiber-network-reinforced-bicontinuous-composite-solid-electrolyte-for-dendrite-free-lithium-metal-batteries
#6
Dan Li, Long Chen, Tianshi Wang, Li-Zhen Fan
Replacement of flammable organic liquid electrolytes with solid Li+ conductors is a promising approach to realize excellent performance of Li metal batteries. However, ceramic electrolytes are either easily reduced by Li metal or penetrated by Li dendrites through their grain boundaries, and polymer electrolytes are also faced with instability on the electrode/electrolyte interface and weak mechanical property. Here we report a 3D fiber-network reinforced bicontinuous solid composite electrolyte with flexible Li+-conductive network (lithium aluminum titanium phosphate (LATP)/polyacrylonitrile (PAN)), which helps to enhance electrochemical stability on the electrode/electrolyte interface by isolating Li and LATP, and suppress Li dendrites growth by mechanical reinforcement of fiber-network for the composite solid electrolyte...
February 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29399703/release-of-nickel-and-chromium-ions-from-orthodontic-wires-following-the-use-of-teeth-whitening-mouthwashes
#7
AmirHossein Mirhashemi, Sahar Jahangiri, MohammadJavad Kharrazifard
BACKGROUND: Corrosion resistance is an important requirement for orthodontic appliances. Nickel and chromium may be released from orthodontic wires and can cause allergic reactions and cytotoxicity when patients use various mouthwashes to whiten their teeth. Our study aimed to assess the release of nickel and chromium ions from nickel titanium (NiTi) and stainless steel (SS) orthodontic wires following the use of four common mouthwashes available on the market. METHODS: This in vitro, experimental study was conducted on 120 orthodontic appliances for one maxillary quadrant including five brackets, one band and half of the required length of SS, and NiTi wires...
February 5, 2018: Progress in Orthodontics
https://www.readbyqxmd.com/read/29398110/surface-characteristics-and-biocompatibility-of-cranioplasty-titanium-implants-following-different-surface-treatments
#8
Muhanad M Hatamleh, Xiaohong Wu, Ahmad Alnazzawi, Jason Watson, David Watts
OBJECTIVE: Surface and mechanical properties of titanium alloys are integral for their use in restoring bone defects of skull and face regions. These properties are affected by the method of constructing and surface treatment of the titanium implant. This study aimed to investigate the effects of titanium finishing protocols on the surface morphology, hardness and biocompatibility of TiAl6V4. METHODS: Square shaped TiAl6V4 specimens (ASTM F68) (10×10×0.5mm) were divided into seven groups of different surface treatments (n=10)...
February 1, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29386536/additive-manufacturing-of-magnetic-shielding-and-ultra-high-vacuum-flange-for-cold-atom-sensors
#9
Jamie Vovrosh, Georgios Voulazeris, Plamen G Petrov, Ji Zou, Youssef Gaber, Laura Benn, David Woolger, Moataz M Attallah, Vincent Boyer, Kai Bongs, Michael Holynski
Recent advances in the understanding and control of quantum technologies, such as those based on cold atoms, have resulted in devices with extraordinary metrological performance. To realise this potential outside of a lab environment the size, weight and power consumption need to be reduced. Here we demonstrate the use of laser powder bed fusion, an additive manufacturing technique, as a production technique relevant to the manufacture of quantum sensors. As a demonstration we have constructed two key components using additive manufacturing, namely magnetic shielding and vacuum chambers...
January 31, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29353526/using-3-dimensional-modeling-to-customize-titanium-plates-for-repair-of-chest-wall-trauma
#10
Justin A Smith, Vanessa P Ho, Christopher W Towe
BACKGROUND: Open reduction and internal fixation of rib fractures is recommended to decrease mortality, shorten the duration of mechanical ventilation, and lower hospital length of stay. Prosthetic titanium plates are frequently used to repair chest wall trauma, and are typically contoured to the patient's anatomy at the time of implant in the operating room. We describe the use of 3-dimensional (3D) digitally corrected rapid prototyping to generate a model of a patient's skeletal anatomy for the purposes of preoperative customization of standard titanium plates for fixation of rib fractures...
January 1, 2018: Surgical Innovation
https://www.readbyqxmd.com/read/29352333/long-term-results-of-custom-cementless-stem-total-hip-arthroplasty-performed-in-hip-fusion
#11
Xavier Flecher, Matthieu Ollivier, Pascal Maman, Sébastien Pesenti, Sébastien Parratte, Jean-Noël Argenson
INTRODUCTION: Due to complex anatomical considerations, results of cementless-stem total hip arthroplasty (THA) in hip fusion remain controversial compared with conventional THA. We therefore aimed to analyse 3D anatomy of the fused hip based on pre-operative computed tomography (CT) scans, functional outcomes based on the Harris Hip Score (HHS) and the Hip Disability and Osteoarthritis Outcome Score (HOOS), modifications of hip anatomy based on post-operative standardised radiography, and determine complication rate and long-term survival based on Kaplan-Meier analysis...
January 19, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29342864/mechanical-properties-of-a-newly-additive-manufactured-implant-material-based-on-ti-42nb
#12
Christian Schulze, Markus Weinmann, Christoph Schweigel, Olaf Keßler, Rainer Bader
The application of Ti-6Al-4V alloy or commercially pure titanium for additive manufacturing enables the fabrication of complex structural implants and patient-specific implant geometries. However, the difference in Young's modulus of α + β-phase Ti alloys compared to the human bone promotes stress-shielding effects in the implant-bone interphase. The aim of the present study is the mechanical characterization of a new pre-alloyed β-phase Ti-42Nb alloy for application in additive manufacturing. The present investigation focuses on the mechanical properties of SLM-printed Ti-42Nb alloy in tensile and compression tests...
January 13, 2018: Materials
https://www.readbyqxmd.com/read/29340342/precision-of-the-connection-between-implant-and-standard-or-computer-aided-design-computer-aided-manufacturing-abutments-a-novel-evaluation-method
#13
Diego Lops, Roberto Meneghello, Luca Sbricoli, Gianpaolo Savio, Eriberto Bressan, Edoardo Stellini
PURPOSE: The aim of this in vitro study was to verify whether or not stock and computer-aided design/computer-aided manufacturing (CAD/CAM) abutments show similar precision in the connection with the respective implants. MATERIALS AND METHODS: Ten CAD/CAM titanium abutments were compared with 10 stock titanium abutments. Each abutment fit a regular-platform implant (Institute Straumann). Implants and abutments were measured independently and then connected. During the connection procedure, the torque was measured using a six-axes load cell...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29335485/electron-beam-melting-in-the-fabrication-of-three-dimensional-mesh-titanium-mandibular-prosthesis-scaffold
#14
Rongzeng Yan, Danmei Luo, Haitao Huang, Runxin Li, Niu Yu, Changkui Liu, Min Hu, Qiguo Rong
The study was designed to fulfill effective work-flow to fabricate three-dimensional mesh titanium scaffold for mandibular reconstruction. The 3D titanium mesh scaffold was designed based on a volunteer with whole mandible defect. (1) acquisition of the CT data; (2) design with computer aided design (CAD) and finite element analysis (FEA). The pore size and intervals with the best mechanic strength was also calculated using FEA. (3) fabrication of the scaffold using electron beam melting (EBM); (4) implantation surgery...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334989/implantation-of-a-3d-printed-titanium-sternum-in-a-patient-with-a-sternal-tumor
#15
Anton Dzian, Jozef Živčák, Rastislav Penciak, Radovan Hudák
BACKGROUND: Primary malignant or metastatic sternal tumors are uncommon. A subtotal or total sternectomy can offer a radical form of treatment. The issue is to restore the structural integrity of the chest wall. CASE PRESENTATION: We report the implantation of an individualized 3D-printed titanium sternum in a patient with a sternal tumor. CONCLUSIONS: We believe that tridimensional print technologies may also change the strategy of chest wall reconstruction...
January 15, 2018: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29327779/locally-delivered-ethyl-2-5-dihydroxybenzoate-using-3d-printed-bone-implant-for-promotion-of-bone-regeneration-in-a-osteoporotic-animal-model
#16
B-J Kwon, G M Seon, M H Lee, M-A Koo, M S Kim, D Kim, J-J Han, D Kim, J Kim, J-C Park
Osteoporosis is a disease characterized by low bone mass, most commonly caused by an increase in bone resorption that is not matched by sufficient bone formation. The most common complications of postmenopausal osteoporosis are bone-related defects and fractures. Fracture healing is a multifactorial bone regeneration process, influenced by both biological and mechanical factors related to age, osteoporosis and stability of the osteosynthesis. During the treatment of bone defects in osteoporotic conditions, imbalanced bone remodeling is the leading cause for implant failure...
January 12, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29321260/mechanobiologically-optimized-3d-titanium-mesh-scaffolds-enhance-bone-regeneration-in-critical-segmental-defects-in-sheep
#17
Anne-Marie Pobloth, Sara Checa, Hajar Razi, Ansgar Petersen, James C Weaver, Katharina Schmidt-Bleek, Markus Windolf, Andras Á Tatai, Claudia P Roth, Klaus-Dieter Schaser, Georg N Duda, Philipp Schwabe
Three-dimensional (3D) titanium-mesh scaffolds offer many advantages over autologous bone grafting for the regeneration of challenging large segmental bone defects. Our study supports the hypothesis that endogenous bone defect regeneration can be promoted by mechanobiologically optimized Ti-mesh scaffolds. Using finite element techniques, two mechanically distinct Ti-mesh scaffolds were designed in a honeycomb-like configuration to minimize stress shielding while ensuring resistance against mechanical failure...
January 10, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29310677/chest-wall-reconstruction-with-a-customized-titanium-alloy-prosthesis-fabricated-by-3d-printing-and-rapid-prototyping
#18
Xiaopeng Wen, Shan Gao, Jinteng Feng, Shuo Li, Rui Gao, Guangjian Zhang
BACKGROUND: As 3D printing technology emerge, there is increasing demand for a more customizable implant in the repair of chest-wall bony defects. This article aims to present a custom design and fabrication method for repairing bony defects of the chest wall following tumour resection, which utilizes three-dimensional (3D) printing and rapid-prototyping technology. METHODS: A 3D model of the bony defect was generated after acquiring helical CT data. A customized prosthesis was then designed using computer-aided design (CAD) and mirroring technology, and fabricated using titanium-alloy powder...
January 8, 2018: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29310359/natural-teeth-retained-splint-based-on-a-patient-specific-3d-printed-mandible-used-for-implant-surgery-and-vestibuloplasty-a-case-report
#19
Helin Xing, Jinshuang Wu, Lei Zhou, Sefei Yang
RATIONALE: With respect to improving the quality of oral rehabilitation, the management of keratinized mucosa is as important as bone condition for implant success. To enhance this management, a natural teeth-retained splint based on a patient-specific 3-dimensional (3D) printed mandible was used in vestibuloplasty to provide sufficient keratinized mucosa around dental implants to support long-term implant maintenance. PATIENT CONCERNS: A 28-year-old male patient had a fracture of the anterior andible 1 year ago, and the fracture was treated with titanium...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29260814/tis3-sheet-based-van-der-waals-heterostructures-with-a-tunable-schottky-barrier
#20
Jie Liu, Yaguang Guo, Fancy Qian Wang, Qian Wang
Monolayer titanium trisulfide (TiS3), synthesized recently through exfoliation [Adv. Mater., 2015, 27, 2595], has emerged as a new 2D material with outstanding electronic and optical properties. Here, using first-principles calculations we show for the first time the great potential of the TiS3 monolayer as a channel material when in contact with graphene and other 2D metallic materials to form van der Waals (vdW) heterostructures, where the intrinsic properties of both the TiS3 monolayer and the 2D materials are preserved, different from the conventional 3D metal/TiS3 semiconductor heterojunction [Nanoscale, 2017, 9, 2068]...
December 20, 2017: Nanoscale
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