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three-dimensional printing

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https://www.readbyqxmd.com/read/28817741/reconstruction-of-a-severely-atrophied-alveolar-ridge-by-computer-aided-gingival-simulation-and-3d-printed-surgical-guide-a-case-report
#1
In-Seok Song, Mi-Ran Lee, Jae-Jun Ryu, Ui-Lyong Lee
Dental implants positioned in severely atrophied anterior maxillae require esthetic or functional compromises. This case report describes the rehabilitation of a severely atrophied alveolar ridge with a three-dimensional (3D) computer-aided design/computer-aided manufacture (CAD/CAM) surgical guide. A 50-year-old woman had a severely atrophied anterior maxilla with unfavorably positioned dental implants. Functional and esthetic prosthodontic restoration was difficult to achieve. An anterior segmental osteotomy was planned to reposition the dental implants...
August 17, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28816292/-precision-of-three-dimensional-printed-brackets
#2
D Zhang, L C Wang, Y H Zhou, X M Liu, J Li
OBJECTIVE: This study was based on digital orthodontic diagnosis work flow for indirect bonding transfer tray model design and three-dimensional (3D) printing, and the aim of this paper was to inspect the dimensional accuracyof 3D printed brackets, which is the foundation of the follow up work and hoped that will illuminate the clinical application of the digital orthodontics work flow. METHODS: The samples which consisted of 14 cases of patients with malocclusion from Department of Orthodontics Peking University were selected, including 8 cases with tooth extraction and 6 cases without tooth extraction...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28812141/next-generation-of-ventricular-catheters-for-hydrocephalus-based-on-parametric-designs
#3
M Galarza, A Giménez, J M Amigó, M Schuhmann, R Gazzeri, U Thomale, J P McAllister
BACKGROUND: The flow pattern of the cerebrospinal fluid is probably the most important factor related to obstruction of ventricular catheters during the normal treatment of hydrocephalus. To better comprehend the flow pattern, we have carried out a parametric study via numerical models of ventricular catheters. In previous studies, the flow was studied under steady and, recently, in pulsatile boundary conditions by means of computational fluid dynamics (CFD) in three-dimensional catheter models...
August 15, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28808803/a-prototype-educational-model-for-hepatobiliary-interventions-unveiling-the-role-of-graphic-designers-in-medical-3d-printing
#4
Ramin Javan, Merissa N Zeman
In the context of medical three-dimensional (3D) printing, in addition to 3D reconstruction from cross-sectional imaging, graphic design plays a role in developing and/or enhancing 3D-printed models. A custom prototype modular 3D model of the liver was graphically designed depicting segmental anatomy of the parenchyma containing color-coded hepatic vasculature and biliary tree. Subsequently, 3D printing was performed using transparent resin for the surface of the liver and polyamide material to develop hollow internal structures that allow for passage of catheters and wires...
August 14, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28807205/facilitating-surgeon-understanding-of-complex-anatomy-using-a-three-dimensional-printed-model
#5
Barrett P Cromeens, William C Ray, Brad Hoehne, Fikir Abayneh, Brent Adler, Gail E Besner
BACKGROUND: 3-dimensional prints (3DP) anecdotally facilitate surgeon understanding of anatomy and decision-making. However, the actual benefit to surgeons or patients has not been quantified. This study investigates how surgeon understanding of complex anatomy is altered by a 3DP compared to computed tomography (CT) scan or CT + digital reconstruction (CT + DR). MATERIALS AND METHODS: Key anatomic features were segmented from a CT-abdomen/pelvis of pygopagus twins to build a DR and printed in color on a 3D printer...
August 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28806146/three-dimensional-bioprinting-of-polycaprolactone-reinforced-gene-activated-bioinks-for-bone-tissue-engineering
#6
Gráinne M Cunniffe, Tomas Gonzalez-Fernandez, Andrew Daly, Binulal N Sathy, Oju Jeon, Eben Alsberg, Daniel J Kelly
Regeneration of complex bone defects remains a significant clinical challenge. Multi-tool biofabrication has permitted the combination of various biomaterials to create multifaceted composites with tailorable mechanical properties and spatially controlled biological function. In this study we sought to use bioprinting to engineer nonviral gene activated constructs reinforced by polymeric micro-filaments. A gene activated bioink was developed using RGD-γ-irradiated alginate and nano-hydroxyapatite (nHA) complexed to plasmid DNA (pDNA)...
August 14, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28806052/one-step-nanoscale-electrohydrodynamic-inkjet-three-dimensional-printing-technique-with-spontaneous-joule-heating
#7
Bin Zhang, Baekhoon Seong, Jaehyun Lee, VuDat Nguyen, DaeHyun Cho, Doyoung Byun
A one-step nanoscale electrohydrodynamic (EHD) inkjet three-dimensional (3D)-printing technique that is based on the drop-on-demand (DOD) operation for which an additional post-sintering process is not required is proposed. Both the numerical simulation and the experimental observations proved that nanoscale Joule heating occurs at the interface between the charged silver nanoparticles (Ag-NPs) because of the high electrical contact resistance during the printing process; this is the reason why an additional post-sintering process is not required...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28800287/measuring-and-establishing-the-accuracy-and-reproducibility-of-3d-printed-medical-models
#8
Elizabeth George, Peter Liacouras, Frank J Rybicki, Dimitrios Mitsouras
Despite the rapid growth of three-dimensional (3D) printing applications in medicine, the accuracy and reproducibility of 3D printed medical models have not been thoroughly investigated. Although current technologies enable 3D models to be created with accuracy within the limits of clinical imaging spatial resolutions, this is not always achieved in practice. Inaccuracies are due to errors that occur during the imaging, segmentation, postprocessing, and 3D printing steps. Radiologists' understanding of the factors that influence 3D printed model accuracy and the metrics used to measure this accuracy is key in directing appropriate practices and establishing reference standards and validation procedures...
August 11, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28798843/an-easily-fabricated-three-dimensional-threaded-lemniscate-shaped-micromixer-for-a-wide-range-of-flow-rates
#9
Mehdi Rafeie, Marcel Welleweerd, Amin Hassanzadeh-Barforoushi, Mohsen Asadnia, Wouter Olthuis, Majid Ebrahimi Warkiani
Mixing fluid samples or reactants is a paramount function in the fields of micro total analysis system (μTAS) and microchemical processing. However, rapid and efficient fluid mixing is difficult to achieve inside microchannels because of the difficulty of diffusive mass transfer in the laminar regime of the typical microfluidic flows. It has been well recorded that the mixing efficiency can be boosted by migrating from two-dimensional (2D) to three-dimensional (3D) geometries. Although several 3D chaotic mixers have been designed, most of them offer a high mixing efficiency only in a very limited range of Reynolds numbers (Re)...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28797089/therapeutic-response-assessment-using-3d-ultrasound-for-hepatic-metastasis-from-colorectal-cancer-application-of-a-personalized-3d-printed-tumor-model-using-ct-images
#10
Ye Ra Choi, Jung Hoon Kim, Sang Joon Park, Bo Yun Hur, Joon Koo Han
BACKGROUND & AIMS: To evaluate accuracy and reliability of three-dimensional ultrasound (3D US) for response evaluation of hepatic metastasis from colorectal cancer (CRC) using a personalized 3D-printed tumor model. METHODS: Twenty patients with liver metastasis from CRC who underwent baseline and after chemotherapy CT, were retrospectively included. Personalized 3D-printed tumor models using CT were fabricated. Two radiologists measured volume of each 3D printing model using 3D US...
2017: PloS One
https://www.readbyqxmd.com/read/28796182/fabrication-and-characterization-of-3d-printed-highly-porous-3d-lifepo%C3%A2-electrodes-by-low-temperature-direct-writing-process
#11
Changyong Liu, Xingxing Cheng, Bohan Li, Zhangwei Chen, Shengli Mi, Changshi Lao
LiFePO₄ (LFP) is a promising cathode material for lithium-ion batteries. In this study, low temperature direct writing (LTDW)-based 3D printing was used to fabricate three-dimensional (3D) LFP electrodes for the first time. LFP inks were deposited into a low temperature chamber and solidified to maintain the shape and mechanical integrity of the printed features. The printed LFP electrodes were then freeze-dried to remove the solvents so that highly-porous architectures in the electrodes were obtained. LFP inks capable of freezing at low temperature was developed by adding 1,4 dioxane as a freezing agent...
August 10, 2017: Materials
https://www.readbyqxmd.com/read/28795951/gelma-collagen-blends-enable-drop-on-demand-3d-printablility-and-promote-angiogenesis
#12
Henrike Stratesteffen, Marius Johannes Köpf, Franziska Kreimendahl, Andreas Blaeser, Stefan Jockenhoevel, Horst Fischer
Effective vascularization is crucial for three dimensional (3D) printed hydrogel-cell constructs to efficiently supply cells with oxygen and nutrients. Till date, several hydrogel blends have been developed that allow the in vitro formation of a capillary-like network within the gels but comparatively less effort has been made to improve the suitability of the materials for a 3D bioprinting process. Therefore, we hypothesize that tailored hydrogel blends of photo-crosslinkable gelatin and type I collagen exhibit favorable 3D drop-on-demand printing characteristics in terms of rheological and mechanical properties and that further capillary-like network formation can be induced by co-culturing human umbilical vein endothelial cells (HUVEC) and human mesenchymal stem cells (hMSC) within the proposed blends...
August 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28795521/liquid-tubule-formation-and-stabilization-using-cellulose-nanocrystal-surfactants
#13
Xubo Liu, Shaowei Shi, Yanan Li, Joe Forth, Dong Wang, Thomas P Russell
Structured liquids, generated by the in situ interfacial generation, assembly and jamming of nanoparticle (NP)-surfactants at liquid interfaces, maintain all the desirable characteristics of each liquid, while providing a spatially structured frame work. Here, we show that rod-like cellulose nanocrystal (CNC)-based NP-surfactants, termed CNC-surfactants, are formed rapidly at the liquid/liquid interface, assemble into a monolayer, and, when jammed, offer a robust assembly with exceptional mechanical properties...
August 9, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28793829/methodological-shortcomings-in-the-literature-evaluating-the-role-and-applications-of-3d-training-for-surgical-trainees
#14
Milosz Kostusiak, Michael Hart, Damiano Giuseppe Barone, Riikka Hofmann, Ramez Kirollos, Thomas Santarius, Rikin Trivedi
AIM: There has been an increased interest in the use of three-dimensional (3D) technology in surgical training. We wish to appraise the methodological rigor applied to evaluating the role and applications of 3D technology in surgical training, in particular, on the validity of these models and assessment methods in simulated surgical training. METHODS: Literature search was performed using MEDLINE with the following terms: "3D"; "surgery"; and "training". Only studies evaluating the role of 3D technology in surgical training were eligible for inclusion and assessed for the level of evidence, validity of the simulation model, and assessment method used...
August 9, 2017: Medical Teacher
https://www.readbyqxmd.com/read/28791080/three-dimensional-printing-model-as-a-tool-to-assist-in-surgery-for-large-mandibular-tumour-a-case-report
#15
Kazuyuki Yusa, Hideyuki Yamanochi, Akira Takagi, Mitsuyoshi Iino
OBJECTIVES: Recently, three-dimensional printing models based on preoperative computed tomography and magnetic resonance imaging images have been widely used in medical fields. This study presents an effective use of the three-dimensional printing model in exploring complex spatial relationship between the tumour and surrounding tissue and in simulation surgery based planning of the operative procedure. MATERIAL AND METHODS: The patient was a 7-year-old boy with ameloblastic fibro-odontoma...
April 2017: Journal of Oral & Maxillofacial Research
https://www.readbyqxmd.com/read/28790931/microtissues-enhance-smooth-muscle-differentiation-and-cell-viability-of-hadscs-for-three-dimensional-bioprinting
#16
Jin Yipeng, Xu Yongde, Wu Yuanyi, Sun Jilei, Guo Jiaxiang, Gao Jiangping, Yang Yong
Smooth muscle differentiated human adipose derived stem cells (hADSCs) provide a crucial stem cell source for urinary tissue engineering, but the induction of hADSCs for smooth muscle differentiation still has several issues to overcome, including a relatively long induction time and equipment dependence, which limits access to abundant stem cells within a short period of time for further application. Three-dimensional (3D) bioprinting holds great promise in regenerative medicine due to its controllable construction of a designed 3D structure...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28789516/aerosol-emissions-from-fuse-deposition-modeling-3d-printers-in-a-chamber-and-in-real-indoor-environments
#17
Marina Eller Vance, Valerie Pegues, Schuyler Van Montfrans, Weinan Leng, Linsey C Marr
Three-dimensional (3D) printers are known to emit aerosols, but questions remain about their composition and the fundamental processes driving emissions. The objective of this work was to characterize aerosol emissions from the operation of a fuse-deposition modeling 3D printer. We modeled the time- and size-resolved emissions of submicron aerosols from the printer in a chamber study, gained insight into the chemical composition of emitted aerosols using Raman spectroscopy, and measured potential for exposure to aerosols generated by 3D printers under real-use conditions in a variety of indoor environments...
August 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28783323/3d-printed-electrodes-for-detection-of-nitroaromatic-explosives-and-nerve-agents
#18
Cavin Tan, Muhammad Zafir Mohamad Nasir, Adriano Ambrosi, Martin Pumera
Three-dimensional (3D) printing has proven to be a versatile and useful technology for specialized applications in industry and also for scientific research. We demonstrate its potential use toward the electrochemical detection of nitroaromatic compounds 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), and fenitrothion (FT). The detection of these compounds is of utmost importance in military and forensic applications. Stainless steel electrodes were fabricated by 3D printing, and the surface was electroplated with gold...
August 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28782439/dosimetry-verification-of-125-i-seeds-implantation-with-three-dimensional-printing-noncoplanar-templates-and-ct-guidance-for-paravertebral-retroperitoneal-malignant-tumors
#19
Zhe Ji, Yuliang Jiang, Liang Su, Fuxin Guo, Ran Peng, Haitao Sun, Jinghong Fan, Junjie Wang
OBJECTIVE: To compare dose distributions of postoperative plans with preoperative plans for radioactive seed implantation of paravertebral/retroperitoneal tumors assisted by 3-dimensional printing noncoplanar templates and computed tomography. METHODS: Sixteen patients with paravertebral/retroperitoneal tumors (21 lesions) underwent radioactive seed implantation with 3-dimensional printing noncoplanar templates. Prescribed dose was 110 to 160 Gy. We compared the dose distribution of the postoperative plan with the preoperative plan...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28782179/cytocompatibility-testing-of-hydrogels-towards-bioprinting-of-mesenchymal-stem-cells
#20
Leo Benning, Ludwig Gutzweiler, Kevin Tröndle, Julian Riba, Roland Zengerle, Peter Koltay, Stefan Zimmermann, G Björn Stark, Günter Finkenzeller
Mesenchymal stem cells (MSCs) represent a very attractive cell source for tissue engineering applications aiming at the generation of artificial bone substitutes. The use of three-dimensional (3D) bioprinting technologies has the potential to improve the classical tissue engineering approach because bioprinting will allow the generation of hydrogel scaffolds with high spatial control of MSC allocation within the bioprinted construct. In this study, we have performed direct comparisons between commercially available hydrogels in the context of their cytocompatibility towards MSCs and their physicochemical parameters with the aim to identify the most suitable hydrogel for drop-on-demand (DoD) printing of MSCs...
August 7, 2017: Journal of Biomedical Materials Research. Part A
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