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Titanium 3d

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https://www.readbyqxmd.com/read/29904773/double-transition-metal-mxenes-with-wide-band-gaps-and-novel-magnetic-properties
#1
Weiwei Sun, Yu Xie, Paul R C Kent
Novel wide band gaps and magnetism in ordered titanium-vanadium, titanium-chromium, and titanium-manganese carbide and nitride based MXenes are predicted using density functional theory. Based on the recent synthesis of Ti centred double transition metal MXenes, we study MXenes with a central Ti layer and different surface early 3d metals, and various terminations, TiM2X2T (M = V, Cr, Mn; X = C, N; T = H, F, O, OH). While previously studied MXenes are strongly metallic, we predict surface metal and termination dependent metal-insulator transitions in the Cr-N and Mn-N series...
June 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/29899592/use-of-material-decomposition-in-the-context-of-neurovascular-intervention-using-standard-flat-panel-and-a-high-resolution-cmos-detector
#2
A R Podgorsak, A C Venkataraman, S V Setlur Nagesh, D R Bednarek, S Rudin, A Siddiqui, C N Ionita
The imaging of endovascular devices during neurovascular procedures such as the coiling of aneurysms guided with CBCT imaging may be challenging due to the presence of highly attenuating materials such as platinum in the coil and stent marker, nickel-titanium in the stent, iodine in the contrast agent, and tantalum in the embolization agent. The use of dual-energy imaging followed by a basis material decomposition image processing-scheme may improve the feature separation and recognition. Two sets of testing were performed to validate this concept...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29890807/-eestablishment-of-the-model-of-goat-lumbar-spinal-fusion-by-3d-printing-technology-and-experimental-perioperative-management
#3
Feng Zhang, Jian-Tao Liu, Rui Wang, Teng Lu, Bin-Bin Niu, Jie Qie, Xuan Cai, Ting Zhang, Peng-Rong Ouyang, Xi-Jing He
OBJECTIVE: To explore the feasibility and the attention of perioperative management of goat lumbar fusion model for individualized 3D printing technology. METHODS: According to preoperative X-ray and CT three dimensional reconstruction data of 10 males Boer goat's lumbar(1-2 years old, weight 35-45 kg), the preoperative open height were determined, meanwhile, according to the theoretical entry point of nails, the length of steel plate, arc, and setting position, screw length for reference were determined, the lumbar lateral anterior plate was designed and 3D-printed...
May 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29864797/note-a-3d-printed-alkali-metal-dispenser
#4
E B Norrgard, D S Barker, J A Fedchak, N Klimov, J Scherschligt, S Eckel
We demonstrate and characterize a source of Li atoms made from direct metal laser sintered titanium. The source's outgassing rate is measured to be 5(2) × 10-7 Pa L s-1 at a temperature T = 330 °C, which optimizes the number of atoms loaded into a magneto-optical trap. The source loads ≈107 7 Li atoms in the trap in ≈1 s. The loaded source weighs 700 mg and is suitable for a number of deployable sensors based on cold atoms.
May 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29863557/three-dimensional-printed-model-and-transantral-endoscopy-to-orbital-fracture-repair
#5
Lucas Borin Moura, Pedro Henrique de Azambuja Carvalho, Marisa Aparecida Cabrini Gabrielli, Valfrido Antonio Pereira-Filho
Orbital fractures are high prevalent and result in several complications such as diplopia, muscular entrapment, visual impairment, and enophthalmos. The goal of orbital reconstruction is to restore orbital anatomy, volume, and globe symmetry. This case report aims to describe the use of transantral endoscopy and 3D printed model for treatment of an orbital floor fracture. A 54-year-old woman presented orbital floor fracture with diplopia and extraocular muscle entrapment. The surgical treatment was performed using a standard titanium mesh bended over 3D printed model, and transantral endoscopy to verify fracture extension and implant adaptation...
May 31, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29858500/shaping-ability-of-biorace-protaper-next-and-genius-nickel-titanium-instruments-in-curved-canals-of-mandibular-molars-a-micro-ct-study
#6
S Drukteinis, V Peciuliene, P M H Dummer, J Hupp
AIM: To evaluate and compare the canal shaping ability of BioRace, ProTaper NEXT, and Genius engine driven nickel-titanium (NiTi) file systems in extracted mandibular first molars using micro-computed tomography (MCT). METHODOLOGY: Sixty mesial root canals of mandibular first molars were randomly divided into three equal groups, according to the instrument system used for root canal preparation (n=20): BioRace (BR), ProTaper NEXT (PTN), or Genius (GN). Root canals were prepared to the full WL using a crown-down technique up to size 35, ...
June 1, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29849015/the-influence-of-selective-laser-melting-slm-process-parameters-on-in-vitro-cell-response
#7
Bartłomiej Wysocki, Joanna Idaszek, Joanna Zdunek, Krzysztof Rożniatowski, Marcin Pisarek, Akiko Yamamoto, Wojciech Święszkowski
The use of laser 3D printers is very perspective in the fabrication of solid and porous implants made of various polymers, metals, and its alloys. The Selective Laser Melting (SLM) process, in which consolidated powders are fully melted on each layer, gives the possibility of fabrication personalized implants based on the Computer Aid Design (CAD) model. During SLM fabrication on a 3D printer, depending on the system applied, there is a possibility for setting the amount of energy density (J/mm³) transferred to the consolidated powders, thus controlling its porosity, contact angle and roughness...
May 30, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29807735/evaluation-of-the-fit-of-metal-copings-fabricated-using-stereolithography
#8
Seong-Bin Kim, Nam-Hoon Kim, Jae-Hong Kim, Hong-Seok Moon
STATEMENT OF PROBLEM: Rapid prototyping, including stereolithography (SLA), is a more recent technique for fabricating metal frameworks than the conventional lost-wax technique. However, investigations of the marginal discrepancies and internal spacing of cobalt-chromium (Co-Cr) metal copings fabricated using SLA are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the clinical acceptability of the marginal discrepancies and internal spacing of Co-Cr metal copings fabricated using the SLA technique...
May 25, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29791363/design-of-a-portable-phantom-device-to-simulate-tissue-oxygenation-and-blood-perfusion
#9
Xiang Lv, Hongyu Chen, Guangli Liu, Shuwei Shen, Qiang Wu, Chuanzhen Hu, Jialuo Li, Erbao Dong, Ronald X Xu
We propose a portable phantom system for calibration and validation of medical optical devices in a clinical setting. The phantom system comprises a perfusion module and an exchangeable tissue-simulating phantom that simulates tissue oxygenation and blood perfusion. The perfusion module consists of a peristaltic pump, two liquid storage units, and two pressure suppressors. The tissue-simulating phantom is fabricated by a three-dimensional (3D) printing process with microchannels embedded to simulate blood vessels...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29788696/forehead-reconstruction-with-a-custom-made-threedimensional-titanium-implant-in-a-parry-romberg-syndrome-patient
#10
Jae Yoon Kim, Bok Ki Jung, Young Suk Kim, Tai Suk Roh, In Sik Yun
Parry-Romberg syndrome is a rare neurocutaneous syndrome characterized by progressive shrinkage and degeneration of the tissues usually on only one side of the face. It is usually difficult to restore the facial contour due to skin tightness. In this case report, we report a forehead reconstruction with custom-made three-dimensional (3D) titanium implant of a Parry-Romberg syndrome patient who was treated with multiple fat grafts but had limited effect. A 36-year-old man presented with hemifacial atrophy. The disease progressed from 5 to 16 years old...
May 24, 2018: Archives of Craniofacial Surgery
https://www.readbyqxmd.com/read/29782609/low-cost-customized-cranioplasty-using-a-3d-digital-printing-model-a-case-report
#11
Abel De La Peña, Javier De La Peña-Brambila, Juan Pérez-De La Torre, Miguel Ochoa, Guillermo J Gallardo
Background: Cranial defects usually occur after trauma, neurosurgical procedures like decompressive craniotomy, tumour resections, infection and congenital defects. The purpose of cranial vault repair is to protect the underlying brain tissue, to reduce any localized pain and patient anxiety, and improve cranial aesthetics. Cranioplasty is a frequent neurosurgical procedure achieved with the aid of cranial prosthesis made from materials such as: titanium, autologous bone, ceramics and polymers...
2018: 3D printing in medicine
https://www.readbyqxmd.com/read/29772259/photocatalytic-production-of-hydroxyl-radicals-by-commercial-tio-2-nanoparticles-and-phototoxic-hazard-identification
#12
Ying Tang, Rui Cai, Ding Cao, Xue Kong, Yongbo Lu
This study identifies the phototoxic potential of commercial titanium dioxide nanoparticles (TiO2 NPs) used in sunscreens and consumer products by employing a tiered testing approach comprising physicochemical, in vitro and ex vivo tests. Our results revealed that all the test samples of TiO2 NPs, varied in surface coating, crystallinity and primary particle size, produced hydroxyl radicals upon UVA photoexcitation as determined by electron spin resonance (ESR) spectroscopy. Their phototoxic potentials were assessed first by combining the validated 3T3 neutral red uptake phototoxicity test and red blood cell phototoxicity test and subsequently in ex vivo models of chick chorioallantoic membrane (CAM) and reconstructed human 3D skin model (H3D)...
May 14, 2018: Toxicology
https://www.readbyqxmd.com/read/29761982/-study-on-the-geometric-characteristics-and-distribution-of-porosities-in-three-dimensional-printed-ti-6al-4v-titanium-alloy
#13
Zhipeng Wan, Wentao Jiang, Chong Wang, Qingyuan Wang, Yalan Li
Three dimensional (3D) printing is considered as an advanced manufacturing technology because of its additive nature. Electron beam melting (EBM) is a widely used 3D printing processes for the manufacturing of metal components. However, the products printed via this process generally contain micro porosities which affect mechanical properties, especially the fatigue property. In this paper, two types of EBM printed samples of the Ti-6Al-4V alloy, one with a round cross section and the other with a triangle cross section, were employed to investigate the existence of porosities using computed tomography (CT)...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29752092/a-novel-porous-bioceramic-scaffold-by-accumulating-hydroxyapatite-spheres-for-large-bone-tissue-engineering-iii-characterization-of-porous-structure
#14
Jingwei Zhang, Dongqin Xiao, Xu He, Feng Shi, Pinfeng Luo, Wei Zhi, Ke Duan, Jie Weng
Physical characteristics of bone tissue engineering scaffolds, including interconnectivity, microporosity, macroporosity, and pore geometry are known to play a crucial role in bone regeneration. In the present study, three-dimensional (3D) interconnected scaffolds were prepared by accumulating hydroxyapatite (HA) spheres in a titanium mesh tube (ф 1.5 × 3 cm). Three types of porous scaffolds were constructed using HA spheres with diameters of 1651-1981 μm, 830-1180 μm and a mixture of 1651-1981 μm and 830-1180 μm at a volumetric ratio of 1:1, respectively...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29744418/bioactivation-of-titanium-dioxide-scaffolds-by-alp-functionalization
#15
A Sengottuvelan, P Balasubramanian, J Will, A R Boccaccini
Three dimensional TiO2 scaffolds are receiving renewed attention for bone tissue engineering (TE) due to their biocompatibility and attractive mechanical properties. However the bioactivity of these scaffolds is comparatively lower than that of bioactive glass or hydroxyapatite (HA) scaffolds. One strategy to improve bioactivity is to functionalize the surface of the scaffolds using biomolecules. Alkaline phosphatase (ALP) was chosen in this study due to its important role in the bone mineralization process...
June 2017: Bioactive Materials
https://www.readbyqxmd.com/read/29724535/does-fixation-method-affects-temporomandibular-joints-after-mandibular-advancement
#16
Erdogan Utku Ureturk, Aysegul Apaydin
PURPOSE: Sagittal split ramus osteotomy (SSRO) is a standard procedure in which miniplates and screws are used to achieve stabilization. Although the titanium plate and screw fixation system is stable, resorbable fixation systems are also used. There is currently no consensus on the ideal fixation technique for SSRO procedures and its effect on the condyle. We aimed to evaluate the stress distribution on temporomandibular joints (TMJ). METHODS: A 3D finite element model of a hemimandible was designed and 5 mm advancement was simulated on a computer model...
April 7, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29722937/a-novel-methodology-to-validate-the-accuracy-of-extraoral-dental-scanners-and-digital-articulation-systems
#17
A Ellakwa, S Elnajar, D Littlefair, G Sara
PURPOSE: The aim of the current study is to develop a novel method to investigate the accuracy of 3D scanners and digital articulation systems. MATERIALS AND METHODS: An upper and a lower poured stone model were created by taking impression of fully dentate male (fifty years old) participant. Titanium spheres were added to the models to allow for an easily recognisable geometric shape for measurement after scanning and digital articulation. Measurements were obtained using a Coordinate Measuring Machine to record volumetric error, articulation error and clinical effect error...
May 30, 2018: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/29705965/evaluation-of-implant-screw-loosening-by-resonance-frequency-analysis-with-triaxial-piezoelectric-pick-up-in-vitro-model-and-in-vivo-animal-study
#18
Makiko Miyashita, Toru Ogawa, Hideki Naito, Aya Shibamoto, Angelina Shuhua Wang, Kenta Shobara, Keiichi Sasaki
OBJECTIVE: The aim of this study was to evaluate implant screw loosening using resonance frequency (RF) analysis with triaxial piezoelectric pick-up in vitro and in vivo. METHODS: For the in vitro experiment, a titanium implant was inserted into a mandibular model. The abutment screws were tightened to 10 N torque and loosened from 0 to 90° for RF measurement using 13 different screw conditions. In the in vivo experiment, three titanium implants were installed in each tibia of a New Zealand white rabbit, and the RF values were recorded after 8 weeks...
April 28, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29697648/-the-interdisciplinary-approach-to-the-rehabilitation-of-the-patients-presenting-with-congenital-atresia-of-the-external-auditory-canal-and-the-concomitant-microtia
#19
Kh M Diab, D N Nazaryan, N A Daikhes, A E Kharazyan, D S Kondratchikov, S V Yarantsev, O A Pashchinina, M M Cherninkiy
The objective of the present study was to develop and introduce into the clinical practice the method for the combined aesthetic and functional rehabilitation of the patients presenting with congenital atresia of the external auditory canal (CAEAC) and the concomitant microtia. A total of 8 patients at the age from 6 to 21 years with unilateral CAEAC and microtia were given the surgical treatment. During the intervention, atresia was resolved using the trans-mastoid approach, tympanoplasty of autofasciae and ossiculoplasty making use of the partial titanium prosthesis and the placement of cranial osteointegratable titanium implants...
2018: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/29697440/three-dimensionally-printed-personalized-implant-design-and-reconstructive-surgery-for-a-bone-tumor-of-the-calcaneus-a-case-report
#20
Jong Woong Park, Hyun Guy Kang, Kwun Mook Lim, June Hyuk Kim, Han Soo Kim
CASE: A 23-year-old soldier was diagnosed with a calcaneal desmoplastic fibroma. Limb-salvage surgery using a 3-dimensionally (3D) printed personalized implant made from a titanium alloy was planned. The implant had a mesh-style surface for free tendon suture, and the joint surface was smooth to preserve the subtalar joint. The implant had 3 hollow posts in case of future transarticular immobilization. At the last follow-up, the implant was painless and stable, and the patient could walk normally without support...
April 25, 2018: JBJS Case Connector
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