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https://www.readbyqxmd.com/read/29139286/highly-sensitive-flexible-pressure-sensors-based-on-printed-organic-transistors-with-centro-apically-self-organized-organic-semiconductor-microstructures
#1
So Young Yeo, Sangsik Park, Yeonjin Yi, Do Hwan Kim, Jung Ah Lim
A highly sensitive pressure sensor based on a printed organic transistors with three-dimensionally self-organized organic semiconductor microstructures were demonstrated. A unique organic transistor with semiconductor channels positioned at the highest summit of printed cylindrical microstructures was achieved simply by printing an organic semiconductor and polymer blend on the plastic substrate without the use of additional etching or replication processes. A combination of the printed organic semiconductor microstructure and an elastomeric top-gate dielectric resulted in a highly sensitive OFET pressure sensor with a high pressure sensitivity of 1...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29125215/additive-manufacturing-a-comparative-analysis-of-dimensional-accuracy-and-skin-texture-reproduction-of-auricular-prostheses-replicas
#2
Alexey Unkovskiy, Sebastian Spintzyk, Detlef Axmann, Eva-Maria Engel, Heiner Weber, Fabian Huettig
PURPOSE: The use of computer-aided design/computer-aided manufacturing (CAD/CAM) and additive manufacturing in maxillofacial prosthetics has been widely acknowledged. Rapid prototyping can be considered for manufacturing of auricular prostheses. Therefore, so-called prostheses replicas can be fabricated by digital means. The objective of this study was to identify a superior additive manufacturing method to fabricate auricular prosthesis replicas (APRs) within a digital workflow. MATERIALS AND METHODS: Auricles of 23 healthy subjects (mean age of 37...
November 10, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29116866/functional-changes-through-the-usage-of-3d-printed-transitional-prostheses-in-children
#3
Jorge M Zuniga, Jean L Peck, Rakesh Srivastava, James E Pierce, Drew R Dudley, Nicholas A Than, Nicholas Stergiou
INTRODUCTION: There is limited knowledge on the use of 3 D-printed transitional prostheses, as they relate to changes in function and strength. Therefore, the purpose of this study was to identify functional and strength changes after usage of 3 D-printed transitional prostheses for multiple weeks for children with upper-limb differences. MATERIALS AND METHODS: Gross manual dexterity was assessed using the Box and Block Test and wrist strength was measured using a dynamometer...
November 8, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29116295/effect-of-ceramic-thickness-grinding-and-aging-on-the-mechanical-behavior-of-a-polycrystalline-zirconia
#4
Rodrigo Diniz Prado, Gabriel Kalil Rocha Pereira, Marco Antonio Bottino, Renata Marques de Melo, Luiz Felipe Valandro
Monolithic restorations of Y-TZP have been recommended as a restorative alternative on prosthetic dentistry as it allows a substantial reduction of ceramic thickness, which means a greater preservation of tooth structure. However, the influence of grinding and aging when using a thinner layer of the material is unclear. This investigation aimed to evaluate and compare the effects of ceramic thickness (0.5 mm and 1.0 mm), grinding and aging (low-temperature degradation) on the mechanical behavior and surface characteristics of a full-contour Y-TZP ceramic...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29068576/assessment-of-the-primary-stability-of-root-analog-zirconia-implants-designed-using-cone-beam-computed-tomography-software-by-means-of-the-periotest%C3%A2-device-an-ex-vivo-study-a-preliminary-report
#5
Jacek Matys, Katarzyna Świder, Rafał Flieger, Marzena Dominiak
BACKGROUND: The implant primary stability is a fundamental prerequisite for a success of osseointegration process which determines the prosthetic reconstruction time. OBJECTIVES: The aim of the present study was to assess the quality and precision of modern conical bone computer tomography (CBCT) software in preparing root analog zirconia implants (RAZIs) by measuring its primary stability by means of the Periotest device. MATERIAL AND METHODS: Thirteen pig jaws with proper erupted first premolar (P1) teeth were used in the study...
August 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29060829/image-based-fluid-dynamics-analysis-of-left-ventricle-outflow-tract-pressure-gradient-after-deployment-transcatheter-mitral-valve
#6
Yousef Alharbi, Nigel H Lovell, James Otton, David Muller, Amr Al Abed, Socrates Dokos
The goal of this study was to develop an image-based model to computational investigate blood flow and pressure gradients resulting from left ventricular (LV) wall motion after the implantation of a mitral valve (MV) prosthesis. Two image-based 3D models were reconstructed from multi-slice computed tomography images obtained from patients undergoing transcatheter MV replacement. Navier-Stokes equations were then used to compute the fluid motion. Outflow tract obstruction of the models with MV prosthesis were identified by calculating the difference between LV systolic and aortic pressures...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060020/design-implementation-and-performance-validation-of-uompro-artificial-hand-towards-affordable-hand-prostheses
#7
Kalinga Nisal, Isuru Ruhunge, Janaka Subodha, Chamika Janith Perera, Thilina Dulantha Lalitharatne
In this paper, an anthropometric, active artificial prosthetic hand named UOMPro (University of Moratuwa Prosthetic) is proposed. The UOMPro hand is realized during research on developing affordable hand prostheses for use by people mainly in developing countries where purchasing high cost state-of-the-art commercial hand prostheses may be beyond their capacity. The proposed hand is developed with an affordable cost (<; 850 USD) and it consists of 6 Degrees of Freedom (DOF) including flexion/extension motions of five fingers and abduction/adduction motion of the thumb finger...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28979183/nanowire-fet-based-neural-element-for-robotic-tactile-sensing-skin
#8
William Taube Navaraj, Carlos García Núñez, Dhayalan Shakthivel, Vincenzo Vinciguerra, Fabrice Labeau, Duncan H Gregory, Ravinder Dahiya
This paper presents novel Neural Nanowire Field Effect Transistors (υ-NWFETs) based hardware-implementable neural network (HNN) approach for tactile data processing in electronic skin (e-skin). The viability of Si nanowires (NWs) as the active material for υ-NWFETs in HNN is explored through modeling and demonstrated by fabricating the first device. Using υ-NWFETs to realize HNNs is an interesting approach as by printing NWs on large area flexible substrates it will be possible to develop a bendable tactile skin with distributed neural elements (for local data processing, as in biological skin) in the backplane...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28971093/antimicrobial-peptides-in-biomedical-device-manufacturing
#9
REVIEW
Martijn Riool, Anna de Breij, Jan W Drijfhout, Peter H Nibbering, Sebastian A J Zaat
Over the past decades the use of medical devices, such as catheters, artificial heart valves, prosthetic joints, and other implants, has grown significantly. Despite continuous improvements in device design, surgical procedures, and wound care, biomaterial-associated infections (BAI) are still a major problem in modern medicine. Conventional antibiotic treatment often fails due to the low levels of antibiotic at the site of infection. The presence of biofilms on the biomaterial and/or the multidrug-resistant phenotype of the bacteria further impair the efficacy of antibiotic treatment...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28965679/integrating-hinge-axis-approximation-and-the-virtual-facial-simulation-of-prosthetic-outcomes-for-treatment-with-cad-cam-immediate-dentures-a-clinical-report-of-a-patient-with-microstomia
#10
Katelyn M Kuric, Bryan T Harris, Dean Morton, Bruno Azevedo, Wei-Shao Lin
This clinical report describes a digital workflow using extraoral digital photographs and volumetric datasets from cone beam computed tomography (CBCT) imaging to create a 3-dimensional (3D), virtual patient with photorealistic appearance. In a patient with microstomia, hinge axis approximation, diagnostic casts simulating postextraction alveolar ridge profile, and facial simulation of prosthetic treatment outcome were completed in a 3D, virtual environment. The approach facilitated the diagnosis, communication, and patient acceptance of the treatment of maxillary and mandibular computer-aided design and computer-aided manufacturing (CAD-CAM) of immediate dentures at increased occlusal vertical dimension...
September 29, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28959117/decentralized-feedback-controllers-for-robust-stabilization-of-periodic-orbits-of-hybrid-systems-application-to-bipedal-walking
#11
Kaveh Akbari Hamed, Robert D Gregg
This paper presents a systematic algorithm to design time-invariant decentralized feedback controllers to exponentially and robustly stabilize periodic orbits for hybrid dynamical systems against possible uncertainties in discrete-time phases. The algorithm assumes a family of parameterized and decentralized nonlinear controllers to coordinate interconnected hybrid subsystems based on a common phasing variable. The exponential and [Formula: see text] robust stabilization problems of periodic orbits are translated into an iterative sequence of optimization problems involving bilinear and linear matrix inequalities...
July 2017: IEEE Transactions on Control Systems Technology: a Publication of the IEEE Control Systems Society
https://www.readbyqxmd.com/read/28956108/computer-aided-designed-three-dimensional-printed-hemipelvic-prosthesis-for-peri-acetabular-malignant-bone-tumour
#12
Baichuan Wang, Yongqiang Hao, Feifei Pu, Wenbo Jiang, Zengwu Shao
BACKGROUND: Prosthetic reconstruction may be a promising treatment for peri-acetabular malignant bone tumour; however, it is associated with a high complication rate. Therefore, prosthetic design and approach of prosthetic reconstruction after tumour resection warrant study. METHODS: We retrospectively analyzed 11 patients with peri-acetabular malignant bone tumours treated by personalized 3D-printed hemipelvic prostheses after en bloc resection between 2015 and 2016...
September 27, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28927643/a-combined-kinematic-and-kinetic-analysis-at-the-residuum-socket-interface-of-a-knee-disarticulation-amputee
#13
Jinghua Tang, Michael McGrath, Nick Hale, Liudi Jiang, Dan Bader, Piotr Laszczak, David Moser, Saeed Zahedi
The bespoke interface between a lower limb residuum and a prosthetic socket is critical for an amputee's comfort and overall rehabilitation outcomes. Analysis of interface kinematics and kinetics is important to gain full understanding of the interface biomechanics, which could aid clinical socket fit, rehabilitation and amputee care. This pilot study aims to investigate the dynamic correlation between kinematic movement and kinetic stresses at the interface during walking tests on different terrains. One male, knee disarticulation amputee participated in the study...
November 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28910382/refining-experimental-dental-implant-testing-in-the-g%C3%A3-ttingen-minipig-using-3d-computed-tomography-a-morphometric-study-of-the-mandibular-canal
#14
COMPARATIVE STUDY
Giuliano M Corte, Johanna Plendl, Hana Hünigen, Kenneth C Richardson, Ole Gemeinhardt, Stefan M Niehues
This study reports morphometric and age-related data of the mandibular canal and the alveolar ridge of the Göttingen Minipig to avoid complications during in vivo testing of endosseus dental implants and to compare these data with the human anatomy. Using 3D computed tomography, six parameters of the mandibular canal as well as the alveolar bone height and the alveolar ridge width were measured in Göttingen Minipigs aged 12, 17 and 21 months. Our null hypothesis assumes that the age and the body mass have an influence on the parameters measured...
2017: PloS One
https://www.readbyqxmd.com/read/28906326/tissue-engineering-strategies-for-auricular-reconstruction
#15
Michael J Schroeder, Mark S Lloyd
Simulating natural characteristics and aesthetics in reconstructed ears has provided a complex 3-dimensional puzzle for those treating patients with microtia. Costochondral grafts remain the gold standard for autologous reconstruction. However, other options such as Medpor and prosthetics are indicated depending on patient circumstances and personal choice. Research into tissue engineering offers an alternative method to a traditional surgical approach that may reduce donor-site morbidity. However, tissue engineering for microtia reconstruction brings new challenges such as cell sourcing, promotion of chondrogenesis, scaffold vascularization, and prevention of scaffold contraction...
November 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28900572/return-to-running-following-a-knee-disarticulation-amputation-a-case-report
#16
Angela R Diebal-Lee, Robert S Kuenzi, Christopher A Rábago
BACKGROUND AND PURPOSE: The evolution of running-specific prostheses has empowered athletes with lower extremity amputations to run farther and faster than previously thought possible; but running with proper mechanics is still paramount to an injury-free, active lifestyle. The purpose of this case report was to describe the successful alteration of intact limb mechanics from a Rearfoot Striking (RFS) to a Non-Rearfoot Striking (NRFS) pattern in an individual with a knee disarticulation amputation, the associated reduction in Average Vertical Loading Rate (AVLR), and the improvement in functional performance following the intervention...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28893717/secondary-surgical-decompression-of-the-inferior-alveolar-nerve-after-overfilling-of-endodontic-sealer-into-the-mandibular-canal-case-report-and-literature-review
#17
Anne-Victoire Bastien, Jérôme Adnot, Hervé Moizan, Émile Calenda, Olivier Trost
The authors report the case of a 43 year-old woman who underwent endodontic treatment of the right second mandibular molar with substantial extrusion of endodontic material into the mandibular canal. The patient presented at the Department of Oral and Maxillofacial Surgery with a persistent total anaesthesia of the lower lip and chin after two months. 2D panoramic view and 3D CT-scan examination highlighted the overfilling into the mandibular canal with a more than 50% stenosis of the canal and a consequently significant compression of the dental pedicle...
September 8, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28888523/mechanical-alignment-technique-for-tka-are-there-intrinsic-technical-limitations
#18
C Rivière, F Iranpour, E Auvinet, A Aframian, K Asare, S Harris, J Cobb, S Parratte
BACKGROUND: Mechanically aligned (MA) total knee arthroplasty (TKA) is affected by disappointing functional outcomes in spite of the recent improvements in surgical precision and implant designs. This might suggest the existence of intrinsic technical limitations. Our study aims to compare the prosthetic and native trochlear articular surfaces and to estimate the extent of collateral ligament imbalance, which is technically uncorrectable by collateral ligament release when TKA implants are mechanically aligned...
September 6, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28886154/validity-and-reliability-of-a-novel-3d-scanner-for-assessment-of-the-shape-and-volume-of-amputees-residual-limb-models
#19
Elena Seminati, David Canepa Talamas, Matthew Young, Martin Twiste, Vimal Dhokia, James L J Bilzon
BACKGROUND: Objective assessment methods to monitor residual limb volume following lower-limb amputation are required to enhance practitioner-led prosthetic fitting. Computer aided systems, including 3D scanners, present numerous advantages and the recent Artec Eva scanner, based on laser free technology, could potentially be an effective solution for monitoring residual limb volumes. PURPOSE: The aim of this study was to assess the validity and reliability of the Artec Eva scanner (practical measurement) against a high precision laser 3D scanner (criterion measurement) for the determination of residual limb model shape and volume...
2017: PloS One
https://www.readbyqxmd.com/read/28879329/creating-protective-appliances-for-preventing-dental-injury-during-endotracheal-intubation-using-intraoral-scanning-and-3d-printing-a-technical-note
#20
Jin-Hyung Cho, Wonse Park, Kyeong-Mee Park, Seo-Yul Kim, Kee-Deog Kim
Digital dentistry has influenced many dental procedures, such as three-dimensional (3D) diagnosis and treatment planning, surgical splints, and prosthetic treatments. Patient-specific protective appliances (PSPAs) prevent dental injury during endotracheal intubation. However, the required laboratory work takes time, and there is the possibility of tooth extraction while obtaining the dental impression. In this technical report, we utilized new digital technology for creating PSPAs, using direct intraoral scanners and 3D printers for dental cast fabrication...
March 2017: J Dent Anesth Pain Med
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