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https://www.readbyqxmd.com/read/28436881/modulating-lateral-geniculate-nucleus-neuronal-firing-for-visual-prostheses-a-kalman-filter-based-strategy
#1
Amr Jawwad, Hossam H Abolfotuh, Bassem Abdullah, Hani M K Mahdi, Seif Eldawlatly
Developing visual prostheses that target inner brain structures along the visual pathway represent a new hope for patients with completely damaged early visual pathway sites. One of the major challenges in the development of subcortical and cortical visual prostheses is tuning electrical stimulation that could optimally induce desired visual percepts. In this paper, we propose a Kalman filter-based strategy that could be used to identify electrical stimulation patterns that mimic a specific visual input for thalamic visual prostheses...
April 17, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28436879/study-on-interaction-between-temporal-and-spatial-information-in-classification-of-emg-signals-in-myoelectric-prostheses
#2
Radhika Menon, Gaetano Di Caterina, Heba Lakany, Lykourgos Petropoulakis, Bernard Conway, John Soraghan
Advanced forearm prosthetic devices employ classifiers to recognize different electromyography (EMG) signal patterns, in order to identify the user's intended motion gesture. The classification accuracy is one of the main determinants of real-time controllability of a prosthetic limb and hence the necessity to achieve as high an accuracy as possible. In this paper, we study the effects of the temporal and spatial information provided to the classifier on its offline performance and analyze their inter-dependencies...
April 19, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28435624/metal-stain-on-monolithic-zirconia-restoration-a-case-report
#3
Min-Sang Cha, Sang-Woon Lee, Yoon-Hyuk Huh, Lee-Ra Cho, Chan-Jin Park
In restorative treatment using fixed dental prostheses, dentists should select appropriate restoration material among various types of dental materials. The strength, marginal fit, esthetics, wear resistance, biocompatibility, and cost are important factors in the choice of restoration materials. The present case showed a surface stain on a monolithic zirconia restoration that was due to wear between the monolithic zirconia restoration and the base metal alloy restoration. This phenomenon was confirmed by surface roughness measurement and electron probe micro-analysis...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435622/role-of-span-length-in-the-adaptation-of-implant-supported-cobalt-chromium-frameworks-fabricated-by-three-techniques
#4
Ying Zhou, Yong Li, Xiao Ma, Yiqing Huang, Jiawei Wang
PURPOSE: This study evaluated the effect of span length on the adaptation of implant-supported cobalt chromium frameworks fabricated by three techniques. MATERIALS AND METHODS: Models with two solid abutment analogs at different inter-abutment distances were digitized using a laboratory scanner. Frameworks of two-, three-, and four-unit fixed prostheses were designed by a computer. Six dots with a diameter of 0.2 mm were preset on the surface of each framework. A total of 54 implant-supported cobalt chromium frameworks were fabricated by milling, selective laser melting (SLM), and cast techniques...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28434964/reconstruction-of-cranial-vault-defect-with-polyetheretherketone-peek-implants
#5
Pierre Brandicourt, Franck Delanoé, Franck-Emmanuel Roux, Florian Jalbert, David Brauge, Frédéric Lauwers
OBJECT: Reconstruction of a cranial vault defect is a frequent challenge in neurosurgery. Polyetheretherketone (PEEK) is used in many types of prostheses and has been employed for 10 years in our institution (University Hospital of Toulouse - France). The objectives of this study are to describe the benefits and drawbacks of reconstructing the cranial vault defect with a PEEK prosthesis. METHODS: Clinical data of the 37 patients who received a reconstruction with a custom-made PEEK prosthesis from 2007 to 2015 were retrospectively analysed...
April 18, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28433866/the-effect-of-vacuum-assisted-socket-suspension-on-prospective-community-based-falls-by-users-of-lower-limb-prostheses
#6
Noah J Rosenblatt, Tess Ehrhardt
Individuals with lower limb amputation are at increased risk of falling compared to age-matched peers. The purpose of this study was to quantify the effect of socket suspension on the risk of falling, by comparing prospectively tracked falls between a group of participants that used vacuum assisted socket suspension (VASS) and a group that did not use this system. Fifteen current users of VASS and 12 non-VASS users received an email every two weeks for one year, with a link to an online survey that asked whether they fell (i...
April 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28432457/outcome-and-revision-rate-of-uncemented-glenohumeral-resurfacing-c-a-p-after-5-8%C3%A2-years
#7
P C Geervliet, M P J van den Bekerom, P Spruyt, M Curvers, A van Noort, C P J Visser
BACKGROUND: Resurfacing of the glenohumeral joint for patients with glenohumeral arthritis has gained popularity since the first introduction. We report the mid-term results of the Global C.A.P. uncemented resurfacing shoulder prosthesis (DePuy Synthes). METHODS: From January 2007 to December 2009, 48 humeral cementless resurfacing prostheses in 46 patients were performed. All patients were diagnosed with primary glenohumeral osteoarthritis. Patients were contacted for review; the Constant Score, visual analog pain scale, Dutch Simple Shoulder Test, SF-12 scores and physical examination were assessed both preoperatively and yearly postoperatively...
April 21, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28430883/ten-year-results-of-aortic-valve-replacement-with-first-generation-mitroflow-bioprosthesis-is-early-degeneration-a-structural-or-a-technical-issue
#8
Liesbeth Lootens, Jonas Verbeke, Thomas Martens, Tine Philipsen, Frank Caes, Yves Van Belleghem, Guido Van Nooten, Katrien François, Dirk De Bacquer, Thierry Bove
OBJECTIVES: Concerns have been raised about the durability of the first-generation Mitroflow aortic bioprosthesis (model 12 A-LX) due to the lack of anticalcification treatment. This study reflects a 10-year experience with this prosthesis for aortic valve replacement. METHODS: From June 2003 to May 2012, the Mitroflow prosthesis was used for aortic valve replacement in 510 patients, of whom only 467 with complete clinical follow-up were included for analysis. Study end-points were survival and incidence of structural valve degeneration (SVD)...
April 19, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28430342/safety-and-efficacy-outcomes-of-zsi-475-penile-prosthesis
#9
Mariusz Blewniewski, Ireneusz Ostrowski, Tobias Pottek, Frank Neugart, Janusz Ciechan, Christophe Llorens, Waldemar Rozanski
OBJECTIVE: The aim of this study was to demonstrate safety and efficacy of ZSI 475 hydraulic penile prosthesis three components. Preparation, procedure and functional results are similar to AMS 700 and Coloplast Titan. This study was conducted from September 2012 to December 2016. PATIENTS AND METHOD: From September 2012 to December 2016, 29 ZSI 475 hydraulic penile prostheses three components were implanted by six surgeons in 28 patients in five European centres...
April 20, 2017: Urologia
https://www.readbyqxmd.com/read/28424583/a-rodent-model-of-dynamic-facial-reanimation-using-functional-electrical-stimulation
#10
Mark A Attiah, Julius de Vries, Andrew G Richardson, Timothy H Lucas
Facial paralysis can be a devastating condition, causing disfiguring facial droop, slurred speech, eye dryness, scarring and blindness. This study investigated the utility of closed-loop functional electric stimulation (FES) for reanimating paralyzed facial muscles in a quantitative rodent model. The right buccal and marginal mandibular branches of the rat facial nerve were transected for selective, unilateral paralysis of whisker muscles. Microwire electrodes were implanted bilaterally into the facial musculature for FES and electromyographic (EMG) recording...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28421875/three-dimensional-printing-and-its-applications-in-otorhinolaryngology-head-and-neck-surgery
#11
Trevor D Crafts, Susan E Ellsperman, Todd J Wannemuehler, Travis D Bellicchi, Taha Z Shipchandler, Avinash V Mantravadi
Objective Three-dimensional (3D)-printing technology is being employed in a variety of medical and surgical specialties to improve patient care and advance resident physician training. As the costs of implementing 3D printing have declined, the use of this technology has expanded, especially within surgical specialties. This article explores the types of 3D printing available, highlights the benefits and drawbacks of each methodology, provides examples of how 3D printing has been applied within the field of otolaryngology-head and neck surgery, discusses future innovations, and explores the financial impact of these advances...
November 1, 2016: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28421293/failure-and-revision-rates-of-proximal-humeral-fracture-treatment-with-the-use-of-a-standardized-treatment-algorithm-at-a-level-1-trauma-center
#12
Jan Christoph Katthagen, Meret Huber, Svenja Grabowski, Alexander Ellwein, Gunnar Jensen, Helmut Lill
BACKGROUND: The aims of this study were to evaluate treatment failure and revision rates of proximal humeral fracture (PHF) treatment with a standardized treatment algorithm within the reality of a level-1 trauma center and to identify predictors of subsequent surgery. MATERIALS AND METHODS: The medical database of a level-1 trauma center was screened for all primary treatments of PHFs between January 2009 and June 2012. Medical records and imaging were analyzed to identify the fracture morphology, pre-existing diseases, revision surgeries and treatment failures (conversion to another treatment)...
April 18, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28419886/total-hip-arthroplasty-for-patients-with-crowe-type-iv-developmental-dysplasia-of-the-hip-ten-years-results
#13
Wei-Nan Zeng, Jun-Li Liu, Fu-You Wang, Xin Zhang, Hua-Quan Fan, Guang-Xing Chen, Lin Guo, Xiao-Jun Duan, Qiang Zhou, Liu Yang
BACKGROUND AND OBJECTIVES: The aim of this study was to determine the rate of union, functional results and complications in patients with Crowe IV developmental dysplasia of the hip (DDH) who underwent cementless total hip arthroplasty (THA) with S-ROM prostheses and subtrochanteric transverse shortening osteotomy. METHODS: Forty-five patients (52 hips) operated between January 2005 and May 2008, with a mean age of 40.6 years at surgery were followed. The mean follow-up period was 9...
April 15, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28418269/is-a-hollow-centralizer-necessary-when-using-a-polished-tapered-cemented-femoral-stem
#14
Erik Weber, Christer Olsson, Uldis Kesteris, Gunnar Flivik
Background and purpose - A tapered, polished and collarless stem is normally equipped with a hollow centralizer to prevent the stem from becoming end-bearing in the cement as the stem subsides. In a randomized clinical trial, we evaluated such a stem (MS-30), which was initially introduced with a solid centralizer but was later recommended to be fitted with a hollow centralizer. We hypothesized that while the stem would sink more, it would become rotationally stable and have less retroversion with a hollow centralizer than with a solid centralizer...
April 18, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28417602/novel-use-of-perfusion-balloon-inflation-to-avoid-outflow-tract-obstruction-during-transcatheter-mitral-valve-in-valve-replacement
#15
Howard C Herrmann, Wilson Y Szeto, Harold Litt, William Vernick
Left ventricular outflow tract (LVOT) obstruction is a recognized complication of transcatheter mitral valve-in-valve replacement in previous surgical prostheses. We describe a patient who was high risk for repeat open surgery in whom the LVOT was compromised by a surgical strut and the potential for LVOT obstruction. A novel approach to avoiding this complication was utilized. A perfusion balloon was inflated in the outflow tract to provide an opposing force during mitral valve deployment resulting in less flaring of the strut into the outflow tract thereby improving the neo-LVOT area...
April 18, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28412789/-development-and-preliminary-clinical-application-of-home-made-temporomandibular-joint-prostheses
#16
D M He, L Z Zhang, C Yang
Objective: To explore the clinical application of home-made temporomandibular joint (TMJ) prostheses. Methods: Self-developed TMJ prostheses were applied for end stage osteoarthritis, TMJ ankylosis, condylar tumors after biomechanical examination. The stability of the prostheses toward bone was evaluated during operation. Post-operative CT scans and clinical follow-ups were taken to check changes of mouth opening, position of the prostheses, bone resorption around the screws, and heterotopic bone formation around artificial condyle...
April 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28411966/ultrasound-screening-for-adverse-local-tissue-reaction-after-hip-arthroplasty
#17
David J Robinson, Steven Lee, Paul Marks, Michal E Schneider
Early detection of adverse local tissue reaction (ALTR) to prosthetic hip wear debris is vital to improve the success of revision surgery. Magnetic resonance imaging with metal artefact reduction sequencing (MARS MRI) is considered the modality of choice to provide cross-sectional imaging of the soft tissues. The areas adjacent to the prosthesis are, however, not readily imaged using these protocols. Ultrasound has also been recommended as an imaging modality in the follow-up of hip replacement surgery. We decided to characterise the typical ultrasound findings in a group of patients undergoing routine biennial review of arthroplastic hips with particular reference to the hip capsule, femoral neck and iliopsoas bursa and tendon adjacent to the implant...
April 12, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28409856/pleural-malignant-mesothelioma-in-dental-laboratory-technicians-a-case-series
#18
Carolina Mensi, Francesco Ciullo, Gino Pietro Barbieri, Luciano Riboldi, Anna Somigliana, Giulio Rasperini, Angela Cecilia Pesatori, Dario Consonni
Asbestos was used in dentistry as a binder in periodontal dressings and as lining material for casting rings and crucible. However, until now, only one case of malignant mesothelioma with occupational exposure to asbestos in dental practice has been reported. We present 4 pleural mesotheliomas out of 5344 cases identified in Lombardy, Italy, in 2000-2014. Three men had been working as dental laboratory technicians, with asbestos exposure for 10, 34, and 4 years, and one woman had been helping her husband for 30 years in manufacturing dental prostheses...
May 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28407990/mandibular-movements-in-older-people-with-rheumatoid-arthritis
#19
Kelly Machado de Andrade, Bruna Fernandes Moreira Alfenas, Camila Heitor Campos, Renata Cunha Matheus Rodrigues Garcia
OBJECTIVE: The aim of this study was to compare the mandibular movements in older people with and without temporomandibular disorder (TMD) associated with rheumatoid arthritis (RA). STUDY DESIGN: Thirty partially or completely edentulous older adults (65.33 ± 4.7 years) were assigned to 2 groups: (1) with RA and TMD and (2) without RA and TMD. Chewing movements of the jaws during mastication of the test material (Optocal) and the range of mandibular movements were evaluated by using the JT-3-D kinesiographic device before and after new removable prosthesis insertion...
May 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28403247/early-complications-of-immediate-loading-in-edentulous-full-arch-restorations-a-retrospective-analysis-of-88-cases
#20
Iñaki Cercadillo-Ibarguren, Alba Sánchez-Torres, Rui Figueiredo, Eduard Valmaseda-Castellón
PURPOSE: To describe the clinical outcomes and complications related to provisional prostheses after full-arch implant-supported rehabilitation by means of an immediate loading protocol. MATERIALS AND METHODS: This retrospective cohort study included patients who were consecutively treated with full-arch implant-supported restorations with a minimum of four implants (Replace Select Tapered TiUnite, Nobel Biocare AB) per arch and conical abutments (multi-unit, Nobel Biocare AB) by means of an immediate loading protocol...
April 12, 2017: International Journal of Oral & Maxillofacial Implants
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