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Biomedizinische Technik. Biomedical Engineering

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https://www.readbyqxmd.com/read/29775437/digital-microscopic-evaluation-of-vertical-marginal-discrepancies-of-cad-cam-fabricated-zirconia-cores
#1
Syed Rashid Habib
OBJECTIVE: The aim of this in vitro research study was to evaluate the vertical marginal discrepancies of zirconia (Zr) cores fabricated by five different computer-aided design and manufacturing (CAD/CAM) systems using a digital microscope. MATERIALS AND METHODS: A total of 60 specimens were prepared and randomly divided into five groups (n=12 each) using the following systems: Ceramill Motion 2 (CM, Amanngirrbach, Germany); Weiland (WI, Ivoclar Vivadent, USA); Cerec (CS, Sirona Dental, USA); Zirkonzahn (ZZ, Gmbh Bruneck, Italy) and Cad4dent (CD, Canada)...
May 18, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29775436/modelling-the-degree-of-porosity-of-the-ceramic-surface-intended-for-implants
#2
Sebastian Stach, Olga Kędzia, Żaneta Garczyk, Zygmunt Wróbel
The main goal of the study was to develop a model of the degree of surface porosity of a biomaterial intended for implants. The model was implemented using MATLAB. A computer simulation was carried out based on the developed model, which resulted in a two-dimensional image of the modelled surface. Then, an algorithm for computerised image analysis of the surface of the actual oxide bioceramic layer was developed, which enabled determining its degree of porosity. In order to obtain the confocal micrographs of a few areas of the biomaterial, measurements were performed using the LEXT OLS4000 confocal laser microscope...
May 18, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29738308/synthesizing-selenium-and-silver-substituted-hydroxyapatite-based-bone-grafts-and-their-effects-on-antibacterial-efficiency-and-cell-viability
#3
Bunyamin Aksakal, Mehtap Demirel, Zeynep A Sinirlioglu
Hydroxyapatite (HA)-based biografts with selenium (Se) and silver (Ag) substitutions were synthesized using the sol-gel method. The synthesized HA-based biografts at various Se and Ag quantity ratios (wt%) were characterized via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive X-Ray spectroscopy (EDX). Escherichia coli (JM103) and Gram-positive Staphylococcus aureus (ATCC29293) bacteria were used for the cell viability tests by performing the MTT assay...
May 8, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29727297/hyperspectral-imaging-innovative-diagnostics-to-visualize-hemodynamic-effects-of-cold-plasma-in-wound-therapy
#4
Georg Daeschlein, Rico Rutkowski, Stine Lutze, Sebastian von Podewils, Claudia Sicher, Thomas Wild, Hans-Robert Metelmann, Thomas von Woedkte, Michael Jünger
An important clinical potential of cold atmospheric plasma (CAP) lies in tumor and wound treatment, whereby the last-mentioned is well-referenced already. However, the underlying mechanisms of improved wound healing have not been sufficiently clarified yet, in particular the influence of CAP on microcirculation. Hyperspectral imaging (HSI) enables the visualization of microcirculation of large tissue areas, thus this technique seems to be a candidate to examine CAP effects on perfusion and oxygen saturation in wounds...
May 4, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29715172/how-hedstrom-files-fail-during-clinical-use-a-retrieval-study-based-on-sem-optical-microscopy-and-micro-xct-analysis
#5
Spiros Zinelis, Youssef S Al Jabbari
This study was conducted to evaluate the failure mechanism of clinically failed Hedstrom (H)-files. Discarded H-files (n=160) from #8 to #40 ISO sizes were collected from different dental clinics. Retrieved files were classified according to their macroscopic appearance and they were investigated under scanning electron microscopy (SEM) and X-ray micro-computed tomography (mXCT). Then the files were embedded in resin along their longitudinal axis and after metallographic grinding and polishing, studied under an incident light microscope...
May 1, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29708872/analysis-of-on-surface-and-in-air-movement-in-handwriting-of-subjects-with-parkinson-s-disease-and-atypical-parkinsonism
#6
Vera Miler Jerkovic, Vladimir Kojic, Natasa Dragasevic Miskovic, Tijana Djukic, Vladimir S Kostic, Mirjana B Popovic
The purpose of this paper is to emphasize the importance of in-air movement besides on-surface movement for handwriting analysis. The proposed method uses a classification of drawing healthy subjects and subjects with Parkinson's disease, according to their on-surface and in-air handwriting parameters during their writing on a graphical tablet. Experimental results on real data sets demonstrate that the highest accuracy of subject's classification was obtained by combining both on-surface and in-air kinematic parameters...
May 1, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29708874/electro-spun-pla-peg-yarns-for-tissue-engineering-applications
#7
Magnus Kruse, Marc Greuel, Franziska Kreimendahl, Thomas Schneiders, Benedict Bauer, Thomas Gries, Stefan Jockenhoevel
Electro-spinning is widely used in tissue-engineered applications mostly in form of non-woven structures. The development of e-spun yarn opens the door for textile fabrics which combine the micro to nanoscale dimension of electro-spun filaments with three-dimensional (3D) drapable textile fabrics. Therefore, the aim of the study was the implementation of a process for electro-spun yarns. Polylactic acid (PLA) and polyethylene glycol (PEG) were spun from chloroform solutions with varying PLA/PEG ratios (100:0, 90:10, 75:25 and 50:50)...
April 30, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29708873/simple-gastric-motility-assessment-method-with-a-single-channel-electrogastrogram
#8
Nenad B Popović, Nadica Miljković, Mirjana B Popović
Surface electrogastrography (EGG) is a non-invasive technique that is used to record myoelectrical activity of the stomach using cutaneous electrodes placed on the abdomen. Gastric motility assessment by EGG is a candidate for standard clinical procedure based on the quantification of parameters characteristic of gastric motility disorders. Despite its noticeable benefits, EGG is not widely implemented in clinical practice. The main reasons are: (1) lack of standardization of electrode placement, (2) time-consuming diagnostic procedures and (3) a complex multi-channel recording setup...
April 30, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29664732/fibrous-composite-material-for-textile-heart-valve-design-in-vitro-assessment
#9
Amna Amri, Gaetan Laroche, Nabil Chakfe, Frederic Heim
With over 150,000 implantations performed over the world, transcatheter aortic valve replacement (TAVR) has become a surgical technique, which largely competes with open surgery valve replacement for an increasing number of patients. The success of the procedure favors the research toward synthetic valve leaflet materials as an alternative to biological tissues, whose durability remains unknown. In particular, fibrous constructions have recently proven to be durable in vivo over a 6-month period of time in animal sheep models...
April 17, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29648991/three-dimensional-bioglass-collagen-phosphatidylserine-scaffolds-designed-with-functionally-graded-structure-and-mechanical-features
#10
Chunrong Yang, Huazhong Wu, Shou Chen, Guangyu Kang
The development of scaffolds featuring spatiotemporal controlled release of drugs is highly desirable. The goal of this study is to construct an inhomogeneous scaffold with gradient pore structure from top layer to bottom layer. The scaffolds were prepared using bioglass (BG), phosphatidylserine (PS) and steroidal saponins (SS) loaded collagen (COL) microparticles as the main components. The resulting scaffold constructs were characterized in terms of their morphology, drug release kinetics and mechanisms, as well as macroscopic form stability and mechanical properties...
April 12, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29648990/the-peripheral-cannulas-in-extracorporeal-life-support
#11
REVIEW
Svitlana Strunina, Jiri Hozman, Petr Ostadal
Femoral cannulation is a minimally invasive method which is an alternative method for central cannulation. This review focuses on the parameters and features of the available peripheral cannulas. Nowadays there exist many peripheral cannulas in a variety of sizes, configurations and lengths to meet the specific needs of the patients. Modern cannulas are strong, thin-walled and one piece reinforced constructions. Furthermore, modern cannulas are manufactured from a biocompatible material and surface coatings are applied to the cannulas to reduce the activation of the clotting...
April 12, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29624499/adaptation-of-cardiovascular-system-stent-implants
#12
Vytautas Ostasevicius, Yahor Tretsyakou-Savich, Mantas Venslauskas, Agne Bertasiene, Vladimir Minchenya, Pavel Chernoglaz
Time-consuming design and manufacturing processes are a serious disadvantage when adapting human cardiovascular implants as they cause unacceptable delays after the decision to intervene surgically has been made. An ideal cardiovascular implant should have a broad range of characteristics such as strength, viscoelasticity and blood compatibility. The present research proposes the sequence of the geometrical adaptation procedures and presents their results. The adaptation starts from the identification of a person's current health status while performing abdominal aortic aneurysm (AAA) imaging, which is a point of departure for the mathematical model of a cardiovascular implant...
April 6, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29550788/recovery-of-signal-loss-adopting-the-residual-bootstrap-method-in-fetal-heart-rate-dynamics
#13
Sun-Kyung Lee, Young-Sun Park, Kyung-Joon Cha
Fetal heart rate (FHR) data obtained from a non-stress test (NST) can be presented in a type of time series, which is accompanied by signal loss due to physical and biological causes. To recover or estimate FHR data, which is subjected to a high rate of signal loss, time series models [second-order autoregressive (AR(2)), first-order autoregressive conditional heteroscedasticity (ARCH(1)) and empirical mode decomposition and vector autoregressive (EMD-VAR)] and the residual bootstrap method were applied. The ARCH(1) model with the residual bootstrap technique was the most accurate [root mean square error (RMSE), 2...
March 19, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29522415/a-compact-hyperspectral-camera-for-measurement-of-perfusion-parameters-in-medicine
#14
Axel Kulcke, Amadeus Holmer, Philip Wahl, Frank Siemers, Thomas Wild, Georg Daeschlein
Worldwide, chronic wounds are still a major and increasing problem area in medicine with protracted suffering of patients and enormous costs. Beside conventional wound treatment, for instance kinds of oxygen therapy and cold plasma technology have been tested, providing an improvement in the perfusion of wounds and their healing potential, but these methods are unfortunately not sufficiently validated and accepted for clinical practice to date. Using hyperspectral imaging technology in the visible (VIS) and near infrared (NIR) region with high spectral and spatial resolution, perfusion parameters of tissue and wounds can be determined...
March 9, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29500919/simulation-of-personalised-haemodynamics-by-various-mounting-positions-of-a-prosthetic-valve-using-computational-fluid-dynamics
#15
Markus Bongert, Marius Geller, Werner Pennekamp, Volkmar Nicolas
Diseases of the cardiovascular system account for nearly 42% of all deaths in the European Union. In Germany, approximately 12,000 patients receive surgical replacement of the aortic valve due to heart valve disease alone each year. A three-dimensional (3D) numerical model based on patient-specific anatomy derived from four-dimensional (4D) magnetic resonance imaging (MRI) data was developed to investigate preoperatively the flow-induced impact of mounting positions of aortic prosthetic valves to select the best orientation for individual patients...
March 3, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29498932/force-plates-may-be-used-for-dynamic-analyses-of-endoprostheses-explantation-procedures
#16
Hendrik Kohlhof, Sebastian Köhring, Dieter Christian Wirtz, Hartmut Witte
The number of hip and knee arthroplasty replacement surgeries is increasing steadily. In combination with demographic aging and the number of periprosthetic complications, this development has lead to the phenomenon where the need for revision surgery is rising. The problem is, that, while implantation procedures of hip arthroplasties are more or less standardized, explantation is a non-standardized task for experienced specialists, due to the unpredictability of the adequate loosening method. The surgeon often only gets to decide on which tools and methods may be applied to detach the prosthesis, only after getting access to the operation site...
March 2, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29494335/diffuse-near-infrared-imaging-of-tissue-with-picosecond-time-resolution
#17
REVIEW
Dirk Grosenick, Heidrun Wabnitz, Rainer Macdonald
Optical imaging of biological tissue in vivo at multiple wavelengths in the near-infrared (NIR) spectral range can be achieved with picosecond time resolution at high sensitivity by time-correlated single photon counting. Measuring and analyzing the distribution of times of flight of photons randomly propagated through the tissue has been applied for diffuse optical imaging and spectroscopy, e.g. of human breast tissue and of the brain. In this article, we review the main features and the potential of NIR multispectral imaging with picosecond time resolution and illustrate them by exemplar applications in these fields...
March 1, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29489454/optical-molecular-imaging-of-corpora-amylacea-in-human-brain-tissue
#18
Roberta Galli, Matthias Meinhardt, Edmund Koch, Gabriele Schackert, Gerald Steiner, Matthias Kirsch, Ortrud Uckermann
Label-free multiphoton imaging constitutes a promising technique for clinical diagnosis and therapeutic monitoring. Corpora amylacea (CoA) are starch-like structures often found in the diseased brain, whose origin and role in nervous pathologies are still a matter of debate. Recently, CoA in the diseased human hippocampus were found to be second harmonic generation (SHG) active. Here, we show that CoA formed in other parts of the diseased brain and in brain neoplasms display a similar SHG activity. The SHG pattern of CoA depended on laser polarization, indicating that a radial structure is responsible for their nonlinear activity...
February 28, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29478038/long-term-recording-performance-and-biocompatibility-of-chronically-implanted-cylindrically-shaped-polymer-based-neural-interfaces
#19
Richárd Fiáth, Katharina T Hofer, Vivien Csikós, Domonkos Horváth, Tibor Nánási, Kinga Tóth, Frederick Pothof, Christian Böhler, Maria Asplund, Patrick Ruther, István Ulbert
Stereo-electroencephalography depth electrodes, regularly implanted into drug-resistant patients with focal epilepsy to localize the epileptic focus, have a low channel count (6-12 macro- or microelectrodes), limited spatial resolution (0.5-1 cm) and large contact area of the recording sites (~mm2). Thus, they are not suited for high-density local field potential and multiunit recordings. In this paper, we evaluated the long-term electrophysiological recording performance and histocompatibility of a neural interface consisting of 32 microelectrodes providing a physical shape similar to clinical devices...
February 26, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28675748/a-preliminary-study-for-the-assessment-of-hypertension-using-static-and-dynamic-ir-thermograms
#20
Jayanthi Thiruvengadam, Anburajan Mariamichael
Structural changes in blood vessels occur due to prolonged hypertension. Early detection of blood pressure (mm Hg) is essential for disease prevention. The aim of this work is to propose a computer-aided diagnostic (CADx) model for the diagnosis of hypertension using variables derived from non-contact static and dynamic thermal imaging in comparison with the pulse wave velocity (PWV)-derived parameters. Static and dynamic infrared (IR) thermograms of selected skin areas of the body from known hypertensive (n=14) and age- and sex-matched normal subjects were captured...
March 28, 2018: Biomedizinische Technik. Biomedical Engineering
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