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https://www.readbyqxmd.com/read/27933590/three-dimensional-rotational-angiography-for-assessment-of-coronary-arteries-during-melody-valve-implantation-introducing-a%C3%A2-technique-that-may-improve-outcomes
#1
C R Pockett, J W Moore, H G El-Said
BACKGROUND: Adverse events from Melody valve implantation may be catastrophic. To date a role for three dimensional rotational angiography of the aortic root (3DRAA) during Melody valve implantation has not been established. OBJECTIVES: To describe the role of 3DRAA in the assessment of Melody valve candidacy and to demonstrate that it may improve outcomes. METHODS: All patients who underwent cardiac catheterisation for Melody valve implantation and 3DRAA between August 2013 and February 2015 were reviewed...
December 8, 2016: Netherlands Heart Journal
https://www.readbyqxmd.com/read/27928599/understanding-wear-in-dual-mobility-total-hip-replacement-first-generation-explant-wear-patterns
#2
Bertrand Boyer, Thomas Neri, Jean Geringer, Alexandre Di Iorio, Remi Philippot, Frederic Farizon
PURPOSE: Dual mobility was introduced by Pr. G. Bousquet to improve the dislocation risk of total hip arthroplasty (THR). The wear mechanisms of this implant remain to be understood. Could enhanced explant wear analysis explain liner wear behaviour? METHODS: Sixty-six explanted liners were selected. Non-destructive 3D scanning and heat colour treatment allowed reporting wear patterns on both convex and concave sides of the liners. RESULTS: For many liners, liner convexity wear was found to be homogeneous, and linked to a longer implantation time...
December 7, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27915125/artificial-neural-networks-as-a-powerful-numerical-tool-to-classify-specific-features-of-a-tooth-based-on-3d-scan-data
#3
Stefan Raith, Eric Per Vogel, Naeema Anees, Christine Keul, Jan-Frederik Güth, Daniel Edelhoff, Horst Fischer
Chairside manufacturing based on digital image acquisition is gainingincreasing importance in dentistry. For the standardized application of these methods, it is paramount to have highly automated digital workflows that can process acquired 3D image data of dental surfaces. Artificial Neural Networks (ANNs) arenumerical methods primarily used to mimic the complex networks of neural connections in the natural brain. Our hypothesis is that an ANNcan be developed that is capable of classifying dental cusps with sufficient accuracy...
November 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27849521/low-cost-methodology-for-skin-strain-measurement-of-a-flexed-biological-limb
#4
Bevin Lin, Kevin M Moerman, Connor G McMahan, Kenneth A Pasch, Hugh M Herr
OBJECTIVE: The purpose of this manuscript is to compute skin strain data from a flexed biological limb, using portable, inexpensive, and easily-available resources. METHODS: We apply and evaluate this approach on a person with bi-lateral transtibial amputations, imaging left and right residual limbs in extended and flexed knee postures. We map 3D deformations to a flexed biological limb using freeware and a simple point-and-shoot camera. Mean principal strain, maximum shear strain, as well as lines of maximum, minimum, and non-extension are computed from 3D digital models to inform directional mappings of the strain field for an unloaded residual limb...
November 10, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27843356/virtual-surgical-planning-and-3d-printing-in-prosthetic-orbital-reconstruction-with-percutaneous-implants-a-technical-case-report
#5
Yu-Hui Huang, Rosemary Seelaus, Linping Zhao, Pravin K Patel, Mimis Cohen
Osseointegrated titanium implants to the cranial skeleton for retention of facial prostheses have proven to be a reliable replacement for adhesive systems. However, improper placement of the implants can jeopardize prosthetic outcomes, and long-term success of an implant-retained prosthesis. Three-dimensional (3D) computer imaging, virtual planning, and 3D printing have become accepted components of the preoperative planning and design phase of treatment. Computer-aided design and computer-assisted manufacture that employ cone-beam computed tomography data offer benefits to patient treatment by contributing to greater predictability and improved treatment efficiencies with more reliable outcomes in surgical and prosthetic reconstruction...
2016: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/27798408/methodology-for-designing-and-manufacturing-complex-biologically-inspired-soft-robotic-fluidic-actuators-prosthetic-hand-case-study
#6
E Thompson-Bean, R Das, A McDaid
We present a novel methodology for the design and manufacture of complex biologically inspired soft robotic fluidic actuators. The methodology is applied to the design and manufacture of a prosthetic for the hand. Real human hands are scanned to produce a 3D model of a finger, and pneumatic networks are implemented within it to produce a biomimetic bending motion. The finger is then partitioned into material sections, and a genetic algorithm based optimization, using finite element analysis, is employed to discover the optimal material for each section...
October 31, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#7
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27789209/three-dimensional-printing-for-restoration-of-the-donor-face-a-new-digital-technique-tested-and-used-in-the-first-facial-allotransplantation-patient-in-finland
#8
A A Mäkitie, M Salmi, A Lindford, J Tuomi, P Lassus
BACKGROUND AND AIMS: Prosthetic mask restoration of the donor face is essential in current facial transplant protocols. The aim was to develop a new three-dimensional (3D) printing (additive manufacturing; AM) process for the production of a donor face mask that fulfilled the requirements for facial restoration after facial harvest. MATERIALS AND METHODS: A digital image of a single test person's face was obtained in a standardized setting and subjected to three different image processing techniques...
October 5, 2016: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/27699662/imaging-the-implant-soft-tissue-interactions-in-total-knee-arthroplasty
#9
Michel P Bonnin, Tom Van Hoof, Arnoud De Kok, Matthias Verstraete, Catherine Van der Straeten, Moreno Saffarini, Jan Victor
BACKGROUND: In Total Knee Arthroplasty (TKA), residual pain may be secondary to soft tissue impingements, which are difficult to visualize around chromium-cobalt implants using medical imaging, so their interactions remain poorly understood. The goal of this work was to establish a protocol for in-vitro imaging of the soft tissues around TKA, usable during throughout the range of motion (ROM). METHODS: The full size range of a commercially available TKA prosthesis was manufactured by 3D-printing in non-magnetic and non-radiopaque polymer and implanted in 12 cadaveric knees...
December 2016: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/27672779/poster-12-three-dimensional-3d-printed-prosthetics-offer-functional-improvement-in-individuals-with-upper-extremity-limb-loss-a-case-series
#10
Cesar Colasante, Kyle Silva, Yuxi Chen, Matthew N Bartels
No abstract text is available yet for this article.
September 2016: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/27666493/creation-of-a-3-dimensional-virtual-dental-patient-for-computer-guided-surgery-and-cad-cam-interim-complete-removable-and-fixed-dental-prostheses-a-clinical-report
#11
Bryan T Harris, Daniel Montero, Gerald T Grant, Dean Morton, Daniel R Llop, Wei-Shao Lin
This clinical report proposes a digital workflow using 2-dimensional (2D) digital photographs, a 3D extraoral facial scan, and cone beam computed tomography (CBCT) volumetric data to create a 3D virtual patient with craniofacial hard tissue, remaining dentition (including surrounding intraoral soft tissue), and the realistic appearance of facial soft tissue at an exaggerated smile under static conditions. The 3D virtual patient was used to assist the virtual diagnostic tooth arrangement process, providing patient with a pleasing preoperative virtual smile design that harmonized with facial features...
September 22, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27665141/ultrasonic-bone-localization-algorithm-based-on-time-series-cumulative-kurtosis
#12
Guillermo Robles, José Manuel Fresno, Romano Giannetti
The design and optimization of protective equipment and devices such as exoskeletons and prosthetics have the potential to be enhanced by the ability of accurately measure the positions of the bones during movement. Existing technologies allow a quite precise measurement of motion-mainly by using coordinate video-cameras and skin-mounted markers-but fail in directly measuring the bone position. Alternative approaches, as fluoroscopy, are too invasive and not usable during extended lapses of time, either for cost or radiation exposure...
September 22, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27632024/additive-manufacturing-of-biomaterials-tissues-and-organs
#13
Amir A Zadpoor, Jos Malda
The introduction of additive manufacturing (AM), often referred to as three-dimensional (3D) printing, has initiated what some believe to be a manufacturing revolution, and has expedited the development of the field of biofabrication. Moreover, recent advances in AM have facilitated further development of patient-specific healthcare solutions. Customization of many healthcare products and services, such as implants, drug delivery devices, medical instruments, prosthetics, and in vitro models, would have been extremely challenging-if not impossible-without AM technologies...
September 8, 2016: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/27617026/3d-printed-bionic-nanodevices
#14
Yong Lin Kong, Maneesh K Gupta, Blake N Johnson, Michael C McAlpine
The ability to three-dimensionally interweave biological and functional materials could enable the creation of bionic devices possessing unique and compelling geometries, properties, and functionalities. Indeed, interfacing high performance active devices with biology could impact a variety of fields, including regenerative bioelectronic medicines, smart prosthetics, medical robotics, and human-machine interfaces. Biology, from the molecular scale of DNA and proteins, to the macroscopic scale of tissues and organs, is three-dimensional, often soft and stretchable, and temperature sensitive...
June 2016: Nano Today
https://www.readbyqxmd.com/read/27613588/a-smartphone-photogrammetry-method-for-digitizing-prosthetic-socket-interiors
#15
Amaia Hernandez, Edward Lemaire
BACKGROUND AND AIM: Prosthetic CAD/CAM systems require accurate 3D limb models; however, difficulties arise when working from the person's socket since current 3D scanners have difficulties scanning socket interiors. While dedicated scanners exist, they are expensive and the cost may be prohibitive for a limited number of scans per year. A low-cost and accessible photogrammetry method for socket interior digitization is proposed, using a smartphone camera and cloud-based photogrammetry services...
September 9, 2016: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/27612765/comparison-between-all-on-four-and-all-on-six-treatment-concepts-and-framework-material-on-stress-distribution-in-atrophic-maxilla-a-prototyping-guided-3d-fea-study
#16
Cláudia Lopes Brilhante Bhering, Marcelo Ferraz Mesquita, Daniel Takanori Kemmoku, Pedro Yoshito Noritomi, Rafael Leonardo Xediek Consani, Valentim Adelino Ricardo Barão
We evaluated two treatment concepts for the rehabilitation of moderate atrophic maxilla with dental implants (all-on-four and all-on-six) and the effect of framework material on the stress distribution of implant-support system. A three-dimensional finite element model based on a prototype was built to simulate an entirely edentulous maxilla with moderate sinus pneumatization that was rehabilitated with a full-arch fixed dental prosthesis. Four standard implants were positioned according to the all-on-four concept and four standard implants and two short implants were placed according to the all-on-six concept...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27580450/the-dead-spot-phenomenon-in-prosthetic-gait-quantified-with-an-analysis-of-center-of-pressure-progression-and-its-velocity-in-the-sagittal-plane
#17
Tyler D Klenow, Jason T Kahle, M Jason Highsmith
BACKGROUND: The "dead spot" phenomenon in prosthetics is a disruption in forward progression observed in the rearfoot of passive prosthetic foot-ankle systems which results in a compensatory and inefficient gait pattern by amputees. A metric to quantify the dead spot as a kinetic event has not yet been introduced. The present study implements a three-part metric to evaluate the dead spot in terms of time, magnitude, and total area using center of pressure velocity and a novel threshold value calculation...
October 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27573282/-limbitless-solutions-the-prosthetic-arm-iron-man-and-the-science-fiction-of-technoscience
#18
Susan Smith
Early last year, a non-profit organisation called 'Limbitless Solutions' modelled a 3D printed prosthetic arm on a fighting suit that features in the popular superhero film series, Iron Man (2008-2013). In addition, 'Limbitless Solutions' resourcefully deployed the fictional character and inventor of the Iron Man suit, weapons specialist and philanthropist, Tony Stark, played by Robert Downey Jr, in a celebrity/superhero endorsed promotional short film, showing 'Tony', the 'real Iron Man', gifting the futuristic military styled 'gauntlet' to Alex, a 7-year-old boy with a partially developed right arm...
August 29, 2016: Medical Humanities
https://www.readbyqxmd.com/read/27561176/prosthetic-aortic-valve-fixation-study-48-replacement-valves-analyzed-using-digital-pressure-mapping
#19
Candice Y Lee, Joshua K Wong, Ronald E Ross, David C Liu, Kamal R Khabbaz, Angelo J Martellaro, Heather R Gorea, Jude S Sauer, Peter A Knight
OBJECTIVE: Prostheses attachment is critical in aortic valve replacement surgery, yet reliable prosthetic security remains a challenge. Accurate techniques to analyze prosthetic fixation pressures may enable the use of fewer sutures while reducing the risk of paravalvular leaks (PVL). METHODS: Customized digital thin film pressure transducers were sutured between aortic annulus models and 21-mm bioprosthetic valves with 15 × 4-mm, 12 × 4-mm, or 9 × 6-mm-wide pledgeted mattress sutures...
September 2016: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/27533921/finite-element-analysis-of-glenoid-sided-lateralization-in-reverse-shoulder-arthroplasty
#20
Patrick J Denard, Evan Lederman, Bradford O Parsons, Anthony A Romeo
The purpose of this study was to evaluate glenoid-sided lateralization in reverse shoulder arthroplasty (RSA) and compare bony and prosthetic lateralization. The hypothesis was that stress and displacement would increase with progressive bony lateralization and be lower with prosthetic lateralization. A 3D finite element analysis (FEA) was performed on a commercially available RSA prosthesis. Stress and displacement were evaluated at baseline and following 5, 10, and 15 mm of bony or prosthetic lateralization...
August 17, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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