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https://www.readbyqxmd.com/read/29470257/dynamic-patient-specific-three-dimensional-simulation-of-mitral-repair-can-we-practice-mitral-repair-preoperatively
#1
Olivia K Ginty, John M Moore, Yuanwei Xu, Wenyao Xia, Satoru Fujii, Daniel Bainbridge, Terry M Peters, Bob B Kiaii, Michael W A Chu
OBJECTIVE: Planned mitral repair strategies are generally established from preoperative echocardiography; however, specific details of the repair are often determined intraoperatively. We propose that three-dimensional printed, patient-specific, dynamic mitral valve models may help surgeons plan and trial all the details of a specific patient's mitral repair preoperatively. METHODS: Using preoperative echocardiography, segmentation, modeling software, and three-dimensional printing, we created dynamic, high-fidelity, patient-specific mitral valve models including the subvalvular apparatus...
February 22, 2018: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/29466922/rabbit-calvarial-defect-model-for-customized-3d-printed-bone-grafts
#2
Kang-Gon Lee, Kang-Sik Lee, Yu-Jeoung Kang, Jong-Hyun Hwang, Se-Hwan Lee, Sang-Hyug Park, Yongdoo Park, Young-Sam Cho, Bu-Kyu Lee
Bone graft materials are commonly used to regenerate various bone defects, but their application is often limited because of the complex defect shape in various clinical conditions. Hence, customized bone grafts using three-dimensional (3D) printing techniques have been developed. However, conventional simple bone defect models are limited for evaluating the benefits and manufacturing accuracy of 3D-printed customized bone grafts. Thus, the aim of the present study was to develop a complex-shaped bone defect model...
February 21, 2018: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/29466810/three-dimensional-printed-facial-models-in-rhinoplasty
#3
Tristan Klosterman, Thomas Romo Iii
Digital patient photography and morphing software have become an important part of rhinoplasty over the past few decades. Presented is a novel technology incorporating 3D photography and printing to produce life-size models for use in patient evaluation and treatment. Surveys were conducted to assess patient response and were universally positive. Early surgeon experience also indicates benefit for intraoperative use. Three-dimensional printing and modeling is a new technology that has exciting applications for rhinoplasty and facial plastic surgery...
February 21, 2018: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/29466613/readily-production-of-flow-reactor-cartridges-by-3d-printing-of-thermostable-enzymes
#4
Manfred Maier, Carsten P Radtke, Jürgen Hubbuch, Christof M Niemeyer, Kersten S Rabe
Compartmentalization of chemical reactions is an essential principle of life that provides a major source of innovation for the development of novel approaches in biocatalysis. To implement spatially controlled biotransformations, rapid manufacturing methods are needed for the production of biocatalysts applicable in flow systems. While three-dimensional (3D) printing techniques offer high throughput manufacturing capability, they are not usually compatible with the delicate nature of enzymes, which call for physiological processing parameters...
February 21, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29465225/mechano-chemical-regulated-origami-with-tough-hydrogels-by-ion-transfer-printing
#5
Xiaohu Zhou, Tianzhen Li, Jiahui Wang, Fan Chen, Dan Zhou, Qi Liu, Baijia Li, Jingyue Cheng, Xuechang Zhou, Bo Zheng
Stimuli-responsive hydrogels that undergo programmable shape deformation are of great importance for a wide variety of applications spanning from soft robotics and biomedical devices to tissue engineering and drug delivery. To guide the shape morphing, anisotropic elements need to be encoded into the hydrogels during the fabrication yet extremely difficult to alter afterward. This study reports a simple and reliable mechano-chemical regulation strategy to post-engineer the hydrogels by encoding structures of high stiffness locally into pre-stretched tough hydrogels through ion transfer printing with a paper cut...
February 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29464784/total-nasal-reconstruction-with-3d-custom-made-porous-titanium-prosthesis-and-free-thoracodorsal-artery-perforator-flap-a-case-report
#6
Quentin Qassemyar, Nathaniel Assouly, Yoni Madar, Stéphane Temam, Frédéric Kolb
Total nasal reconstruction is a challenging surgical procedure which usually involves a free flap, forehead flap, and cartilage grafts. In certain failure situations where patients do not accept the idea of anaplastology, possibilities become very limited. We report the case of a patient who underwent several reconstruction steps with multiple failures including free and local flaps and cartilage harvests which showed recurrent episodes of necrosis and infection leading to melting and collapse of reconstructed structures...
February 21, 2018: Microsurgery
https://www.readbyqxmd.com/read/29463819/3d-printed-water-soluble-scaffolds-for-rapid-production-of-pdms-micro-fluidic-flow-chambers
#7
Tobias Dahlberg, Tim Stangner, Hanqing Zhang, Krister Wiklund, Petter Lundberg, Ludvig Edman, Magnus Andersson
We report a novel method for fabrication of three-dimensional (3D) biocompatible micro-fluidic flow chambers in polydimethylsiloxane (PDMS) by 3D-printing water-soluble polyvinyl alcohol (PVA) filaments as master scaffolds. The scaffolds are first embedded in the PDMS and later residue-free dissolved in water leaving an inscription of the scaffolds in the hardened PDMS. We demonstrate the strength of our method using a regular, cheap 3D printer, and evaluate the inscription process and the channels micro-fluidic properties using image analysis and digital holographic microscopy...
February 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29454028/fabricating-3d-printed-orally-disintegrating-printlets-using-selective-laser-sintering
#8
Fabrizio Fina, Christine M Madla, Alvaro Goyanes, Jiaxin Zhang, Simon Gaisford, Abdul W Basit
Selective laser sintering (SLS) is a three-dimensional printing (3DP) technology employed to manufacture plastic, metallic or ceramic objects. The aim of this study was to demonstrate the feasibility of SLS to fabricating novel solid dosage forms with accelerated drug release properties, and with a view to create orally disintegrating formulations. Two polymers (hydroxypropyl methylcellulose (HPMC E5) and vinylpyrrolidone-vinyl acetate copolymer (Kollidon ® VA 64)) were separately mixed with 5% paracetamol (used as a model drug) and 3% Candurin ® gold sheen colorant; the powder mixes were subjected to SLS printing resulting in the manufacture of printlets (3DP tablets)...
February 14, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29453808/three-dimensional-printing-in-congenital-heart-disease-a-systematic-review
#9
REVIEW
Ivan Lau, Zhonghua Sun
Three-dimensional (3D) printing has shown great promise in medicine with increasing reports in congenital heart disease (CHD). This systematic review aims to analyse the main clinical applications and accuracy of 3D printing in CHD, as well as to provide an overview of the software tools, time and costs associated with the generation of 3D printed heart models. A search of different databases was conducted to identify studies investigating the application of 3D printing in CHD. Studies based on patient's medical imaging datasets were included for analysis, while reports on in vitro phantom or review articles were excluded from the analysis...
February 17, 2018: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/29452869/three-dimensional-printer-aided-casting-of-soft-custom-silicone-boluses-scsbs-for-head-and-neck-radiation-therapy
#10
Tsuicheng Chiu, Jun Tan, Mathew Brenner, Xuejun Gu, Ming Yang, Kenneth Westover, Tobin Strom, David Sher, Steve Jiang, Bo Zhao
PURPOSE: Custom tissue compensators provide dosimetric advantages for treating superficial or complex anatomy, but currently available fabrication technology is expensive or impractical for most clinical operations and yields compensators that are difficult for patients to tolerate. We aimed to develop an inexpensive, clinically feasible workflow for generating patient-specific, soft, custom silicone boluses (SCSBs) for head-and-neck (HN) radiation therapy. METHODS AND MATERIALS: We developed a method using 3-dimensional printed parts for generating SCSBs for the treatment of HN cancers...
November 11, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29452273/3d-bioprinted-functional-and-contractile-cardiac-tissue-constructs
#11
Zhan Wang, Sang Jin Lee, Heng-Jie Cheng, James J Yoo, Anthony Atala
Bioengineering of a functional cardiac tissue composed of primary cardiomyocytes has great potential for myocardial regeneration and in vitro tissue modeling. However, its applications remain limited because the cardiac tissue is a highly organized structure with unique physiologic, biomechanical, and electrical properties. In this study, we undertook a proof-of-concept study to develop a contractile cardiac tissue with cellular organization, uniformity, and scalability by using three-dimensional (3D) bioprinting strategy...
February 13, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29451097/a-three-dimensional-printed-patient-specific-scaphoid-replacement-a-cadaveric-study
#12
Philipp Honigmann, Ralf Schumacher, Romy Marek, Franz Büttner, Florian Thieringer, Mathias Haefeli
We present our first cadaveric test results of a three-dimensional printed patient-specific scaphoid replacement with tendon suspension, which showed normal motion behaviour and preservation of a stable scapholunate interval during physiological range of motion.
January 1, 2018: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/29450886/theoretical-and-experimental-determination-of-scaling-factors-in-electron-dosimetry-for-3d-printed-polylactic-acid
#13
Stefanos Diamantopoulos, Ioannis Kantemiris, Georgios Patatoukas, Maria Dilvoi, Efstathios Efstathopoulos, Vassilis Kouloulias, Kalliopi Platoni
PURPOSE: Plastic phantoms are commonly used in daily routine for dosimetric tasks in radiation therapy. Despite the fact that water is the reference medium according to the dosimetric protocols, measurements with non-water phantoms are easier to be performed. To succeed absorbed dose determination, certain scaling factors have to be applied to the acquired measurements. Taking into account the increased availability of three-dimensional (3D) printing, we attempted to obtain scaling factors for polylactic acid (PLA), a commonly used thermoplastic material for 3D printing...
February 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29448707/surface-roughness-of-a-3d-printed-ni-cr-alloy-produced-by-selective-laser-melting-effect-of-process-parameters
#14
Min-Ho Hong, Jun Sik Son, Tae-Yub Kwon
The selective laser melting (SLM) process parameters, which directly determine the melting behavior of the metallic powders, greatly affect the nanostructure and surface roughness of the resulting 3D object. This study investigated the effect of various laser process parameters (laser power, scan rate, and scan line spacing) on the surface roughness of a nickel-chromium (Ni-Cr) alloy that was three-dimensionally (3D) constructed using SLM. Single-line formation tests were used to determine the optimal laser power of 200 W and scan rate of 98...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29447128/incorporating-three-dimensional-printing-in-orthodontics
#15
Christian Groth, Kravitz D Neal, Jeffrey M Shirck
No abstract text is available yet for this article.
January 2018: Journal of Clinical Orthodontics: JCO
https://www.readbyqxmd.com/read/29447127/cad-cam-software-for-three-dimensional-printing
#16
Kravitz D Neal, Christian Groth, Tom Shannon
No abstract text is available yet for this article.
January 2018: Journal of Clinical Orthodontics: JCO
https://www.readbyqxmd.com/read/29445303/uncemented-three-dimensional-printed-prosthetic-replacement-for-giant-cell-tumor-of-distal-radius-a-new-design-of-prosthesis-and-surgical-techniques
#17
Minxun Lu, Li Min, Cong Xiao, Yongjiang Li, Yi Luo, Yong Zhou, Wenli Zhang, Chongqi Tu
Introduction: Currently, it is challenging to treat giant cell tumor (GCT) of distal radius. For Campanacci grade III or recurrent GCTs, en bloc resection has been accepted as a better treatment option. Although numerous methods are available for reconstruction, all of them have some limitations in joint function and complications. In this study, our aims were to treat the GCT of distal radius with uncemented three-dimensional (3D)-printed prosthesis and to present and evaluate the surgical techniques and short-term outcomes...
2018: Cancer Management and Research
https://www.readbyqxmd.com/read/29444198/alveolar-ridge-augmentation-with-three-dimensional-printed-hydroxyapatite-devices-a-preclinical-study
#18
Joseph P Fiorellini, Michael R Norton, Kevin WanXin Luan, David Minjoon Kim, Kei Wada, Hector L Sarmiento
The objective of this study was to evaluate the effectiveness of precise three-dimensional hydroxyapatite printed micro- and macrochannel devices for alveolar ridge augmentation in a canine model. All grafts induced minimal inflammatory and fibrotic reactions. Examination of undecalcified sections revealed that both types of grafts demonstrated bone ingrowth. The majority of the bone growth into the block graft was into the channels, though a portion grew directly into the construct in the form of small bony spicules...
February 14, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29441429/three-dimensional-printing-improves-osteochondral-allograft-placement-in-complex-cases
#19
Kelechi R Okoroha, Timothy J Evans, Jeffrey P Stephens, Eric C Makhni, Vasilios Moutzouros
The use of three-dimensional (3D) printing has seen a vast expansion over recent years, with an increased application for its use in orthopaedics. This report details the use of 3D printing technology to aid in the treatment of a medial femoral condyle osteochondral defect in a 26-year-old female who had previously undergone a failed autograft procedure. A preoperative computed tomography scan of the knee and chondral defect was used to generate a 3D printed, one-to-one scale replica of the distal femur. This replica was then used to size a patient-specific allograft plug for the osteochondral transplantation procedure...
February 13, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29440763/rhythm-an-open-source-imaging-toolkit-for-cardiac-panoramic-optical-mapping
#20
Christopher Gloschat, Kedar Aras, Shubham Gupta, N Rokhaya Faye, Hanyu Zhang, Roman A Syunyaev, Roman A Pryamonosov, Jack Rogers, Matthew W Kay, Igor R Efimov
Fluorescence optical imaging techniques have revolutionized the field of cardiac electrophysiology and advanced our understanding of complex electrical activities such as arrhythmias. However, traditional monocular optical mapping systems, despite having high spatial resolution, are restricted to a two-dimensional (2D) field of view. Consequently, tracking complex three-dimensional (3D) electrical waves such as during ventricular fibrillation is challenging as the waves rapidly move in and out of the field of view...
February 13, 2018: Scientific Reports
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