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3D porous titanium

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https://www.readbyqxmd.com/read/28474182/homogenous-scaffold-based-cranial-skull-implant-modelling-and-structural-analysis-unit-cell-algorithm-meshless-approach
#1
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/28350023/topochemical-synthesis-and-photocatalytic-activity-of-3d-hierarchical-batio3-microspheres-constructed-from-crystal-axis-oriented-nanosheets
#2
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
#3
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/28251470/3d-printed-porous-titanium-changed-femoral-head-repair-growth-patterns-osteogenesis-and-vascularisation-in-porous-titanium
#4
Wei Zhu, Yan Zhao, Qi Ma, Yingjie Wang, Zhihong Wu, Xisheng Weng
Osteonecrosis of the femoral head (ONFH) is a major cause of morbidity, and total hip arthroplasty is both traumatic and expensive. Here, we created a gelatine scaffold embedded in uniquely shaped, 3D-printed porous titanium parts, which could attract and promote the proliferation of osteoblasts as well as bone regeneration, as the extracellular matrix (ECM) does in vivo. Interestingly, after hybridisation with platelets, the scaffold exhibited a low yet considerable rate of stable, safe and long-term growth factor release...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28196619/development-and-verification-of-novel-porous-titanium-metaphyseal-cones-for-revision-total-knee-arthroplasty
#5
Ahmad Faizan, Manoshi Bhowmik-Stoker, Vincent Alipit, Amanda E Kirk, Viktor E Krebs, Steven F Harwin, R Michael Meneghini
BACKGROUND: Porous metaphyseal cones are widely used in revision knee arthroplasty. A new system of porous titanium metaphyseal cones has been designed based on the femoral and tibial morphology derived from a computed tomography-based anatomical database. The purpose of this study is to evaluate the initial mechanical stability of the new porous titanium revision cone system by measuring the micromotion under physiologic loading compared with a widely-used existing porous tantalum metaphyseal cone system...
January 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28120579/sacral-reconstruction-with-a-3d-printed-implant-after-hemisacrectomy-in-a-patient-with-sacral-osteosarcoma-1-year-follow-up-result
#6
Doyoung Kim, Jun Young Lim, Kyu Won Shim, Jung Woo Han, Seong Yi, Do Heum Yoon, Keung Nyun Kim, Yoon Ha, Gyu Yeul Ji, Dong Ah Shin
Pelvic reconstruction after sacral resection is challenging in terms of anatomical complexity, excessive loadbearing, and wide defects. Nevertheless, the technological development of 3D-printed implants enables us to overcome these difficulties. Here, we present a case of sacral osteosarcoma surgically treated with hemisacrectomy and sacral reconstruction using a 3D-printed implant. The implant was printed as a customized titanium prosthesis from a 3D real-sized reconstruction of a patient's CT images. It consisted mostly of a porous mesh and incorporated a dense strut...
March 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/27888725/functional-response-of-osteoblasts-in-functionally-gradient-titanium-alloy-mesh-arrays-processed-by-3d-additive-manufacturing
#7
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...
February 1, 2017: 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
#8
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...
March 2017: Journal of Biomedical Materials Research. Part A
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
#9
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/27664796/fully-porous-3d-printed-titanium-femoral-stem-to-reduce-stress-shielding-following-total-hip-arthroplasty
#10
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/27341499/tailored-surface-treatment-of-3d-printed-porous-ti6al4v-by-microarc-oxidation-for-enhanced-osseointegration-via-optimized-bone-in-growth-patterns-and-interlocked-bone-implant-interface
#11
Peng Xiu, Zhaojun Jia, Jia Lv, Chuan Yin, Yan Cheng, Ke Zhang, Chunli Song, Huijie Leng, Yufeng Zheng, Hong Cai, Zhongjun Liu
3D printed porous titanium (Ti) holds enormous potential for load-bearing orthopedic applications. Although the 3D printing technique has good control over the macro-sturctures of porous Ti, the surface properties that affect tissue response are beyond its control, adding the need for tailored surface treatment to improve its osseointegration capacity. Here, the one step microarc oxidation (MAO) process was applied to a 3D printed porous Ti6Al4V (Ti64) scaffold to endow the scaffold with a homogeneous layer of microporous TiO2 and significant amounts of amorphous calcium-phosphate...
July 20, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27300485/antibacterial-behavior-of-additively-manufactured-porous-titanium-with-nanotubular-surfaces-releasing-silver-ions
#12
S Amin Yavari, L Loozen, F L Paganelli, S Bakhshandeh, K Lietaert, J A Groot, A C Fluit, C H E Boel, J Alblas, H C Vogely, H Weinans, A A Zadpoor
Additive manufacturing (3D printing) has enabled fabrication of geometrically complex and fully interconnected porous biomaterials with huge surface areas that could be used for biofunctionalization to achieve multifunctional biomaterials. Covering the huge surface area of such porous titanium with nanotubes has been already shown to result in improved bone regeneration performance and implant fixation. In this study, we loaded TiO2 nanotubes with silver antimicrobial agents to equip them with an additional biofunctionality, i...
July 13, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27092492/hybrid-macro-porous-titanium-ornamented-by-degradable-3d-gel-nha-micro-scaffolds-for-bone-tissue-regeneration
#13
Bo Yin, Pei Ma, Jun Chen, Hai Wang, Gui Wu, Bo Li, Qiang Li, Zhifeng Huang, Guixing Qiu, Zhihong Wu
Porous titanium is a kind of promising material for bone substitution, while its bio-inert property results in demand of modifications to improve the osteointegration capacity. In this study, gelatin (Gel) and nano-hydroxyapatite (nHA) were used to construct 3D micro-scaffolds in the pores of porous titanium in the ratios of Gel:nHA = 1:0, Gel:nHA = 1:1, and Gel:nHA = 1:3, respectively. Cell attachment and proliferation, and gene and protein expression levels of osteogenic markers were evaluated in MC3T3-E1 cells, followed by bone regeneration assessment in a rabbit radius defect model...
April 15, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27045887/bottom-up-fabrication-of-multilayer-stacks-of-3d-photonic-crystals-from-titanium-dioxide
#14
Roman Kubrin, Robert M Pasquarelli, Martin Waleczek, Hooi Sing Lee, Robert Zierold, Jefferson J do Rosário, Pavel N Dyachenko, Josep M Montero Moreno, Alexander Yu Petrov, Rolf Janssen, Manfred Eich, Kornelius Nielsch, Gerold A Schneider
A strategy for stacking multiple ceramic 3D photonic crystals is developed. Periodically structured porous films are produced by vertical convective self-assembly of polystyrene (PS) microspheres. After infiltration of the opaline templates by atomic layer deposition (ALD) of titania and thermal decomposition of the polystyrene matrix, a ceramic 3D photonic crystal is formed. Further layers with different sizes of pores are deposited subsequently by repetition of the process. The influence of process parameters on morphology and photonic properties of double and triple stacks is systematically studied...
April 27, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/26916052/micro-ct-based-modelling-for-characterising-injection-moulded-porous-titanium-implants
#15
Junning Chen, Liangjian Chen, Che-Cheng Chang, Zhongpu Zhang, Wei Li, Michael V Swain, Qing Li
Design of prosthetic implants to ensure rapid and stable osseointegration remains a significant challenge, and continuous efforts have been directed to new implant materials, structures and morphology. This paper aims to develop and characterise a porous titanium dental implant fabricated by metallic powder injection-moulding. The surface morphology of the specimens was firstly examined with a scanning electron microscope (SEM), followed by microscopic computerised tomography (μ-CT) scanning to capture its 3D microscopic features non-destructively...
February 25, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/26802441/influence-of-pore-size-of-porous-titanium-fabricated-by-vacuum-diffusion-bonding-of-titanium-meshes-on-cell-penetration-and-bone-ingrowth
#16
Bei Chang, Wen Song, Tianxiao Han, Jun Yan, Fuping Li, Lingzhou Zhao, Hongchao Kou, Yumei Zhang
UNLABELLED: The present work assesses the potential of three-dimensional (3D) porous titanium (pore size of 188-390 μm and porosity of 70%) fabricated by vacuum diffusion bonding of titanium meshes for applications in bone engineering. Rat bone marrow mesenchymal stem cells were used to investigate the proliferation and differentiation of cells on titanium scaffolds with different pore sizes at day 7, day 14 and day 21 based on DNA contents, alkaline phosphatase (ALP) activity, collagen (COL) secretion and osteogenic gene expressions including ALP, COL-1, bone morphogenetic protein-2 (BMP-2), osteopontin (OPN), runt-related transcription factor 2 (RUNX2), using smooth solid titanium plate as reference material...
March 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/26802440/cell-laden-hydrogel-titanium-microhybrids-site-specific-cell-delivery-to-metallic-implants-for-improved-integration
#17
Geraldine Koenig, Hayriye Ozcelik, Lisa Haesler, Martina Cihova, Sait Ciftci, Agnes Dupret-Bories, Christian Debry, Martin Stelzle, Philippe Lavalle, Nihal Engin Vrana
UNLABELLED: Porous titanium implants are widely used in dental, orthopaedic and otorhinolaryngology fields to improve implant integration to host tissue. A possible step further to improve the integration with the host is the incorporation of autologous cells in porous titanium structures via cell-laden hydrogels. Fast gelling hydrogels have advantageous properties for in situ applications such as localisation of specific cells and growth factors at a target area without dispersion. The ability to control the cell types in different regions of an implant is important in applications where the target tissue (i) has structural heterogeneity (multiple cell types with a defined spatial configuration with respect to each other); (ii) has physical property gradients essential for its function (such as in the case of osteochondral tissue transition)...
March 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/26774799/osteogenic-potential-of-human-adipose-tissue-derived-mesenchymal-stromal-cells-cultured-on-3d-printed-porous-structured-titanium
#18
Eric A Lewallen, Dakota L Jones, Amel Dudakovic, Roman Thaler, Christopher R Paradise, Hilal M Kremers, Matthew P Abdel, Sanjeev Kakar, Allan B Dietz, Robert C Cohen, David G Lewallen, Andre J van Wijnen
Integration of porous metal prosthetics, which restore form and function of irreversibly damaged joints, into remaining healthy bone is critical for implant success. We investigated the biological properties of adipose-tissue-derived mesenchymal stromal/stem cells (AMSCs) and addressed their potential to alter the in vitro microenvironment of implants. We employed human AMSCs as a practical source for musculoskeletal applications because these cells can be obtained in large quantities, are multipotent, and have trophic paracrine functions...
May 1, 2016: Gene
https://www.readbyqxmd.com/read/26042690/porous-niobium-coatings-fabricated-with-selective-laser-melting-on-titanium-substrates-preparation-characterization-and-cell-behavior
#19
Sheng Zhang, Xian Cheng, Yao Yao, Yehui Wei, Changjun Han, Yusheng Shi, Qingsong Wei, Zhen Zhang
Nb, an expensive and refractory element with good wear resistance and biocompatibility, is gaining more attention as a new metallic biomaterial. However, the high price of the raw material, as well as the high manufacturing costs because of Nb's strong oxygen affinity and high melting point have limited the widespread use of Nb and its compounds. To overcome these disadvantages, porous Nb coatings of various thicknesses were fabricated on Ti substrate via selective laser melting (SLM), which is a 3D printing technique that uses computer-controlled high-power laser to melt the metal...
August 2015: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/25967094/controlled-implant-soft-tissue-interaction-by-nanoscale-surface-modifications-of-3d-porous-titanium-implants
#20
Elisabeth Rieger, Agnès Dupret-Bories, Laetitia Salou, Marie-Helene Metz-Boutigue, Pierre Layrolle, Christian Debry, Philippe Lavalle, Nihal Engin Vrana
Porous titanium implants are widely employed in the orthopaedics field to ensure good bone fixation. Recently, the use of porous titanium implants has also been investigated in artificial larynx development in a clinical setting. Such uses necessitate a better understanding of the interaction of soft tissues with porous titanium structures. Moreover, surface treatments of titanium have been generally evaluated in planar structures, while the porous titanium implants have complex 3 dimensional (3D) architectures...
June 7, 2015: Nanoscale
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