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Titanium 3d

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https://www.readbyqxmd.com/read/27925441/anodized-3d-printed-titanium-implants-with-dual-micro-and-nano-scale-topography-promote-interaction-with-human-osteoblasts-and-osteocyte-like-cells
#1
Karan Gulati, Matthew Prideaux, Masakazu Kogawa, Luis Lima-Marques, Gerald J Atkins, David M Findlay, Dusan Losic
The success of implantation of materials into bone is governed by effective osseointegration, requiring biocompatibility of the material and the attachment and differentiation of osteoblastic cells. To enhance cellular function in response to the implant surface, micro- and nano-scale topography have been suggested as essential. In this study, we present bone implants based on 3D-printed titanium alloy (Ti6Al4V), with a unique dual topography composed of micron-sized spherical particles and vertically aligned titania nanotubes...
December 7, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27890357/effect-of-cement-space-on-stress-distribution-in-y-tzp-based-crowns
#2
Carlos Eduardo Edwards Rezende, Ana Flávia Sanches Borges, Carla Castiglia Gonzaga, Yuanyuan Duan, José Henrique Rubo, Jason Alan Griggs
OBJECTIVE: To evaluate the stress distribution in bi-layered Y-TZP based crowns, according to the occlusal internal spacing between coping and abutment. METHODS: Twelve premolar shaped Y-TZP copings were made by a CAD/CAM system and seated on an abutment to evaluate the internal fit at the occlusal third using micro-CT images. Considering the fitting range obtained experimentally, two 3D finite element models, consisting on bone tissue, a titanium implant, a zirconia abutment, cement layer and a bi-layered Y-TZP ceramic crown were constructed based on the micro-CT images, one corresponding to the thinnest cement space and other representing the specimen with the thickest cement space obtained experimentally...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27888725/functional-response-of-osteoblasts-in-functionally-gradient-titanium-alloy-mesh-arrays-processed-by-3d-additive-manufacturing
#3
K C Nune, A Kumar, R D K Misra, S J Li, Y L Hao, R Yang
We elucidate here the osteoblasts functions and cellular activity in 3D printed interconnected porous architecture of functionally gradient Ti-6Al-4V alloy mesh structures in terms of cell proliferation and growth, distribution of cell nuclei, synthesis of proteins (actin, vinculin, and fibronectin), and calcium deposition. Cell culture studies with pre-osteoblasts indicated that the interconnected porous architecture of functionally gradient mesh arrays was conducive to osteoblast functions. However, there were statistically significant differences in the cellular response depending on the pore size in the functionally gradient structure...
November 18, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27885781/cellular-response-of-osteoblasts-to-low-modulus-ti-24nb-4zr-8sn-alloy-mesh-structure
#4
K C Nune, R D K Misra, S J Li, Y L Hao, R Yang
Titanium alloys (Ti-6Al-4V and Ti-6Al-7Nb) are widely used for implants, which are characterized by high elastic modulus (∼110 GPa) with (α + β) structure and that may induce undesirable stress shielding effect and immune responses associated with the presence of toxic elements. In this regard, we have combined the attributes of a new alloy design and the concept of additive manufacturing to fabricate 3D scaffolds with an interconnected porous structure. The new alloy is a β-type Ti-24Nb-4Zr-8Sn (Ti2448) alloy with significantly reduced modulus...
November 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27872014/the-bone-implant-interface-of-dental-implants-in-humans-on-the-atomic-scale
#5
Gustav Sundell, Christer Dahlin, Martin Andersson, Mattias Thuvander
: Osseointegration of dental implants occurs on a hierarchy of length scales down to the atomic level. A deeper understanding of the complex processes that take place at the surface of an implant on the smallest scale is of interest for the development of improved biomaterials. To date, transmission electron microscopy (TEM) has been utilized for examination of the bone-implant interface, providing details on the nanometer level. In this study we show that TEM imaging can be complemented with atom probe tomography (APT) to reveal the chemical composition of a Ti-based dental implant in a human jaw on the atomic level of resolution...
November 18, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27860398/monodisperse-tio%C3%A2-spheres-with-high-charge-density-and-their-self-assembly
#6
Suli Wu, Hongbo Xia, Xin Su, Shufen Zhang
Titanium dioxide (TiO₂) spheres are potential candidates to fabricate three-dimensional (3D) photonic crystals due to their high refractive index and low absorption in the visible and near-infrared regions. Here, TiO₂ spheres with both high surface charge density and uniform size, which are necessary for the self-assembly of TiO₂ spheres, are prepared by sol-gel method in ethanol solution in the presence of thioglycolic acid as ligands. Thioglycolic acid, containing two functional groups, not only acts as coordinating ligand for stabilizing and controlling the growth of TiO₂ spheres, but also endows the resulting TiO₂ sphere with high charge density based on the zeta-potential analyzer potential analyzer when the pH of TiO₂ aqueous dispersion was 6...
November 9, 2016: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/27848100/stress-distribution-difference-between-lava-ultimate-full-crowns-and-ips-e-max-cad-full-crowns-on-a-natural-tooth-and-on-tooth-shaped-implant-abutments
#7
Ivo Krejci, René Daher
The goal of this short communication is to present finite element analysis comparison of the stress distribution between CAD/CAM full crowns made of Lava Ultimate and of IPS e.max CAD, adhesively luted to natural teeth and to implant abutments with the shape of natural teeth. Six 3D models were prepared using a 3D content-creating software, based on a micro-CT scan of a human mandibular molar. The geometry of the full crown and of the abutment was the same for all models representing Lava Ultimate full crowns (L) and IPS e...
November 15, 2016: Odontology
https://www.readbyqxmd.com/read/27843356/virtual-surgical-planning-and-3d-printing-in-prosthetic-orbital-reconstruction-with-percutaneous-implants-a-technical-case-report
#8
Yu-Hui Huang, Rosemary Seelaus, Linping Zhao, Pravin K Patel, Mimis Cohen
Osseointegrated titanium implants to the cranial skeleton for retention of facial prostheses have proven to be a reliable replacement for adhesive systems. However, improper placement of the implants can jeopardize prosthetic outcomes, and long-term success of an implant-retained prosthesis. Three-dimensional (3D) computer imaging, virtual planning, and 3D printing have become accepted components of the preoperative planning and design phase of treatment. Computer-aided design and computer-assisted manufacture that employ cone-beam computed tomography data offer benefits to patient treatment by contributing to greater predictability and improved treatment efficiencies with more reliable outcomes in surgical and prosthetic reconstruction...
2016: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/27821857/establishing-antibacterial-multilayer-films-on-the-surface-of-direct-metal-laser-sintered-titanium-primed-with-phase-transited-lysozyme
#9
Binbin Guan, Haorong Wang, Ruiqing Xu, Guoying Zheng, Jie Yang, Zihao Liu, Man Cao, Mingyao Wu, Jinhua Song, Neng Li, Ting Li, Qing Cai, Xiaoping Yang, Yanqiu Li, Xu Zhang
Direct metal laser sintering is a technology that allows the fabrication of titanium (Ti) implants with a functional gradation of porosity and surface roughness according to three-dimensional (3D) computer data. The surface roughness of direct metal laser sintered titanium (DMLS-Ti) implants may provide abundant binding sites for bacteria. Bacterial colonization and subsequent biofilm formation can cause unsatisfactory cell adhesion and implant-related infections. To prevent such infections, a novel phase-transited lysozyme (PTL) was utilized as an initial functional layer to simply and effectively prime DMLS-Ti surfaces for subsequent coating with antibacterial multilayers...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27806757/-a-preliminary-study-on-the-mechanical-characteristics-of-the-titanium-scaffolds-with-three-dimensional-mesh-structure-fabricated-by-electron-beam-melting
#10
R Z Yan, Y F Li, C Wang, R X Li, Z W Liu, M Hu
Objective: To examine the biomechanical properties of three-dimensional(3D) printed electron beam melting(EBM) Ti-6Al-4V mesh as scaffold for mandibular repairment. Methods: We fabricated Ti-6Al-4V samples of different structures with strut, sheet and 3D mesh scaffolds(a controllable diameter 0.35, 0.50, 0.70 mm, distribution density: intensive sparse) by EBM process. The mechanical properties of these structures were examined by X-ray energy dispersive spectrum(EDS), uniaxial tensile test, three-point bending test, under compression load and compared with their different microstructure and mechanical properties...
November 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#11
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27790580/comparison-of-stress-distribution-in-a-maxillary-central-incisor-restored-with-two-prefabricated-post-systems-with-and-without-ferrule-using-finite-element-method
#12
Aarti Rajambigai, Arun Kumar, Sabarinathan, Ramesh Raja
INTRODUCTION: When restoring an endodontically treated tooth with deficient coronal tooth structure, posts can be used to strengthen the tooth. Recently prefabricated posts are widely used as they exclude the need for complex laboratory procedures making the procedure time saving. But the post-placement can produce stresses that cause root fracture. Different techniques can be used to study the stress distribution due to different posts, but most of them are two-dimensional and difficult to reproduce...
September 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27788122/incorporating-simvastatin-poloxamer-407-hydrogel-into-3d-printed-porous-ti6al4v-scaffolds-for-the-promotion-of-angiogenesis-osseointegration-and-bone-ingrowth
#13
Hao Liu, Wei Li, Can Liu, Jie Tan, Hong Wang, Bao Hai, Hong Cai, Hui-Jie Leng, Zhong-Jun Liu, Chun-Li Song
Three-dimensional porous titanium alloys printed via electron beam melting have low stiffness similar to that of cortical bone and are promising scaffolds for orthopedic applications. However, the bio-inert nature of titanium alloy is poorly compatible with bone ingrowth. We previously observed that simvastatin/poloxamer 407 thermosensitive hydrogel induces endogenous angiogenic/osteogenic growth factors and promotes angiogenesis and osteogenesis, but the mechanical properties of this hydrogel are poor. The purpose of this study was to construct 3D-printed porous titanium scaffolds (pTi scaffolds) filled with simvastatin/hydrogel and evaluate the effects of this composite on osseointegration, bone ingrowth and neovascularization using a tibial defect rabbit model...
October 27, 2016: Biofabrication
https://www.readbyqxmd.com/read/27771189/evaluation-of-the-accuracy-of-extraoral-laboratory-scanners-with-a-single-tooth-abutment-model-a-3d-analysis
#14
Federico Mandelli, Enrico Gherlone, Giorgio Gastaldi, Marco Ferrari
PURPOSE: The aim of this study was to compare the accuracy of different laboratory scanners using a calibrated coordinate measuring machine as reference. METHODS: A sand blasted titanium reference model (RM) was scanned with an industrial 3D scanner in order to obtain a reference digital model (dRM) that was saved in the standard tessellation format (.stl). RM was scanned ten times with each one of the tested scanners (GC Europe Aadva, Zfx Evolution, 3Shape D640, 3Shape D700, NobilMetal Sinergia, EGS DScan3, Open Technologies Concept Scan Top) and all the scans were exported in ...
October 19, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27769722/the-use-of-patient-specific-implants-in-orthognathic-surgery-a-series-of-32-maxillary-osteotomy-patients
#15
Juho Suojanen, Junnu Leikola, Patricia Stoor
The use of virtual surgery, patient-specific saw and drill guides, and custom-made osteosynthesis plates is rapidly spreading from deformity surgery to orthognathic surgery. Most of the commercially available systems are using computer-aided design/computer-aided manufacture (CAD/CAM) wafers to produce patient-specific saw guides. However, most plate systems provided are still the conventional "in stock" mini plates that can be individually designed by pre-bending according to the stereolithographic model of the patient...
September 23, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/27721077/synthesis-of-reduced-graphene-oxide-thorn-like-titanium-dioxide-nanofiber-aerogels-with-enhanced-electrochemical-performance-for-supercapacitor
#16
Tae-Woong Kim, Soo-Jin Park
Reduced graphene oxide (rGO)/thorn-like TiO2 nanofiber (TTF) aerogels, or GTTF aerogels, with different TTF weight ratios were successfully prepared by electrospinning, silica etching and hydrothermal combination method. During the hydrothermal reaction, the rGO nanosheets and TTF self-assembled into three-dimensional (3D) interconnected networks, in which the TTF is loaded onto the rGO nanosheets. The electrochemical performance of the GTTF aerogels was assessed using cyclic voltammetry and galvanostatic charge-discharge measurements in a 1M aqueous Na2SO4 electrolyte...
October 5, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27714104/a-3d-co-culture-microtissue-model-of-the-human-placenta-for-nanotoxicity-assessment
#17
Carina Muoth, Adrian Wichser, Marco Monopoli, Manuel Correia, Nicky Ehrlich, Katrin Loeschner, Audrey Gallud, Melanie Kucki, Liliane Diener, Pius Manser, Wolfram Jochum, Peter Wick, Tina Buerki-Thurnherr
There is increasing evidence that certain nanoparticles (NPs) can overcome the placental barrier, raising concerns on potential adverse effects on the growing fetus. But even in the absence of placental transfer, NPs may pose a risk to proper fetal development if they interfere with the viability and functionality of the placental tissue. The effects of NPs on the human placenta are not well studied or understood, and predictive in vitro placenta models to achieve mechanistic insights on NP-placenta interactions are essentially lacking...
October 6, 2016: Nanoscale
https://www.readbyqxmd.com/read/27676094/substrate-regulated-growth-of-plasma-polymerized-films-on-carbide-forming-metals
#18
Behnam Akhavan, Steven G Wise, Marcela M M Bilek
Although plasma polymerization is traditionally considered as a substrate-independent process, we present evidence that the propensity of a substrate to form carbide bonds regulates the growth mechanisms of plasma polymer (PP) films. The manner by which the first layers of PP films grow determines the adhesion and robustness of the film. Zirconium, titanium, and silicon substrates were used to study the early stages of PP film formation from a mixture of acetylene, nitrogen, and argon precursor gases. The correlation of initial growth mechanisms with the robustness of the films was evaluated through incubation of coated substrates in simulated body fluid (SBF) at 37° for 2 months...
October 11, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27664796/fully-porous-3d-printed-titanium-femoral-stem-to-reduce-stress-shielding-following-total-hip-arthroplasty
#19
Sajad Arabnejad, Burnett Johnston, Michael Tanzer, Damiano Pasini
Current hip replacement femoral implants are made of fully solid materials which all have stiffness considerably higher than that of bone. This mechanical mismatch can cause significant bone resorption secondary to stress shielding, which can lead to serious complications such as peri-prosthetic fracture during or after revision surgery. In this work, a high strength fully porous material with tunable mechanical properties is introduced for use in hip replacement design. The implant macro geometry is based off of a short stem taper-wedge implant compatible with minimally invasive hip replacement surgery...
September 24, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27632271/utilization-of-ceramic-inlays-for-sealing-implant-prostheses-screw-access-holes-a-case-control-study
#20
Sorin Mihali, Silvana Canjau, Emanuel Bratu, Hom-Lay Wang
PURPOSE: The aim of this study was to evaluate, in a case control study, the esthetic and functional clinical performance of ceramic inlays used for covering the screw access hole in single monolithic lithium disilicate full-contour crowns bonded on computer-aided design/computer-aided manufacturing (CAD/CAM) prefabricated titanium abutments in order to eliminate the drawbacks of alternative restorative methods. MATERIALS AND METHODS: Twenty-eight patients with missing teeth in the lateral areas (premolars and molars) received screw-retained implant restorations...
September 2016: International Journal of Oral & Maxillofacial Implants
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