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Extendible Prostheses

Süleyman Karakoyun, Mustafa Ozan Gürsoy, Mahmut Yesin, Macit Kalçık, Mehmet Ali Astarcıoğlu, Sabahattin Gündüz, Ali Emrah Oğuz, Şermin Çoban Kökten, Ayşe Nimet Karadayı, Altuğ Tuncer, Cengiz Köksal, Tayyar Gökdeniz, Mehmet Özkan
BACKGROUND: Prosthetic valve dysfunction due to pannus formation is a rare but serious complication. Currently, limited data are available concerning the pathogenesis and immunohistochemical properties of pannus. The study aim was to investigate the morphological, histopathological and immunohistochemical characteristics of pannus formation in patients with prosthetic valve dysfunction. METHODS: A total of 35 patients (10 males, 25 females; mean age 44 ± 16 years) who had undergone re-do valve surgery due to prosthetic valve obstruction was enrolled in the study...
2016: Journal of Heart Valve Disease
Matthew A Petoe, Mohit N Shivdasani
Retinal prostheses can provide artificial vision to patients with degenerate retinae by electrically stimulating the remaining inner retinal neurons. The evoked perception is generally adequate for light localization, but of limited spatial resolution owing to the indiscriminate activation of multiple retinal cell types, leading to distortions in the perceived image. Here we present a perspective on a recent work by Weitz and colleagues who demonstrate a focal confinement of retinal ganglion cell (RGC) activation when using extended pulse durations in the stimulation waveform...
November 2016: Annals of Translational Medicine
M M Gilg, C L Gaston, M C Parry, L Jeys, A Abudu, R M Tillman, S R Carter, R J Grimer
AIMS: Extendible endoprostheses have been available for more than 30 years and have become more sophisticated with time. The latest generation is 'non-invasive' and can be lengthened with an external magnetic force. Early results have shown a worryingly high rate of complications such as infection. This study investigates the incidence of complications and the need for further surgery in a cohort of patients with a non-invasive growing endoprosthesis. PATIENTS AND METHODS: Between 2003 and June 2014, 50 children (51 prostheses) had a non-invasive growing prosthesis implanted for a primary bone sarcoma...
December 2016: Bone & Joint Journal
Elizabeth King, Carl Abbott, Lawrence Dovgalski, James Owens
Nasal carcinoma extending into the premaxilla requires radical surgical excision including rhinectomy and partial maxillectomy. Rehabilitation is complex and involves the use of removable prostheses. Three patients treated with zygomatic implants and custom-milled bars to retain an obturator and nasal prosthesis are presented.
November 15, 2016: Journal of Prosthetic Dentistry
Hideo Ichimura, Michihiro Maeda, Shinji Kikuchi, Yuichiro Ozawa, Koji Kanemoto, Koichi Kurishima, Hiroaki Iijima, Hiroichi Ishikawa, Yukio Sato
We describe two cases in each of which a dental prosthesis, presenting as an endobronchial foreign body (FB), was successfully retrieved using a snare technique employing a flexible bronchoscope and fluoroscopy that enabled us to avoid the need for rigid bronchoscope and thoracotomy. In one case, the FB was peripherally lodged and bronchoscopically invisible. In the other case, the FB was observed in the right intermediate bronchus, but the grasping basket and forceps were unable to retrieve it. The combination of a flexible bronchoscope and fluoroscopy extended the application of the snare technique to bronchoscopically invisible FBs and facilitated placement of an encircling loop around the FB...
2016: Respiratory Medicine Case Reports
Lorenzo Trevisiol, Pasquale Procacci, Antonio D'Agostino, Francesca Ferrari, Daniele De Santis, Pier Francesco Nocini
PURPOSE: Several authors have described zygoma implants as a reliable surgical option to rehabilitate severe maxillary defects in case of extreme atrophy or oncological resections. The aim of this study is to report a new technical approach to the rehabilitation of a complex oronasal defect by means of a zygoma-implant-supported full-arch dental prosthesis combined with a nasal epithesis. PATIENTS AND METHODS: The patient presented with a subtotal bilateral maxillectomy and total rhinectomy defect because of a squamous cell carcinoma of the nose...
December 2016: International Journal of Implant Dentistry
Kimberly Naden Hollander, Mario Montealegre-Gallegos, Feroze Mahmood
In recent years, the use of transcatheter aortic valve replacement (TAVR) has extended beyond the treatment of native aortic valve stenosis in patients with high surgical risk. TAVR is increasingly being performed for bioprosthetic aortic valve failure, i.e., the valve-in-valve (VIV) procedure. Establishing the success of a VIV procedure can be challenging in these cases. Furthermore, the limited availability of prostheses sizes further complicates the management of these patients. We present an unusual case of a repeat TAVR in a patient who previously had a VIV procedure in an aortic homograft...
October 2016: Annals of Cardiac Anaesthesia
Danilo Gonzaga de França, Maria Helena Morais, Flávio D das Neves, Adriana Fonte Carreiro, Gustavo As Barbosa
PURPOSE: The aim of this study was to evaluate the effectiveness of fabrication methods (computer-aided design/computer-aided manufacture [CAD/CAM], copy-milling, and conventional casting) in the fit accuracy of three-unit, screw-retained fixed dental prostheses. MATERIALS AND METHODS: Sixteen three-unit implant-supported screw-retained frameworks were fabricated to fit an in vitro model. Eight frameworks were fabricated using the CAD/CAM system, four in zirconia and four in cobalt-chromium...
October 5, 2016: International Journal of Oral & Maxillofacial Implants
Simona Crea, Benoni B Edin, Kristel Knaepen, Romain Meeusen, Nicola Vitiello
BACKGROUND: Reduced sensory feedback from lower leg prostheses results in harmful gait patterns and entails a significant cognitive burden because users have to visually monitor their locomotion. OBJECTIVES: The purpose of this study was to validate a sensory feedback device designed to help elderly patients with transfemoral amputation to improve their temporal gait symmetry after a training program aimed at associating the vibrotactile patterns with symmetrical walking...
September 29, 2016: Physical Therapy
John Martin Barrett, Gerrit Hilgen, Evelyne Sernagor
Retinitis pigmentosa is a progressive retinal dystrophy that causes irreversible visual impairment and blindness. Retinal prostheses currently represent the only clinically available vision-restoring treatment, but the quality of vision returned remains poor. Recently, it has been suggested that the pathological spontaneous hyperactivity present in dystrophic retinas may contribute to the poor quality of vision returned by retinal prosthetics by reducing the signal-to-noise ratio of prosthetic responses. Here, we investigated to what extent blocking this hyperactivity can improve optogenetic retinal prosthetic responses...
September 21, 2016: Scientific Reports
Paolo Berretta, Marco Di Eusanio
Aortic valve stenosis is the most common valve disease in the western world. Over the past few years the number of aortic valve replacement (AVR) interventions has increased with outcomes that have been improved despite increasing age of patients and increasing burden of comorbidities. However, despite such excellent results and its well-established position, conventional AVR has undergone great development over the previous two decades. Such progress, by way of less invasive incisions and use of new technologies, including transcatheter aortic valve implantation and sutureless valve prostheses, is intended to reduce the traumatic impact of the surgical procedure, thus fulfilling lower risk patients' expectations on the one hand, and extending the operability toward increasingly high-risk patients on the other...
September 2016: Journal of Geriatric Cardiology: JGC
Calvin D Eiber, Socrates Dokos, Nigel H Lovell, Gregg J Suaning
The capacity to quickly and accurately simulate extracellular stimulation of neurons is essential to the design of next-generation neural prostheses. Existing platforms for simulating neurons are largely based on finite-difference techniques; due to the complex geometries involved, the more powerful spectral or differential quadrature techniques cannot be applied directly. This paper presents a mathematical basis for the application of a spectral element method to the problem of simulating the extracellular stimulation of retinal neurons, which is readily extensible to neural fibers of any kind...
August 19, 2016: Medical & Biological Engineering & Computing
Gayatri Shankaran, Suryakant Chhagan Deogade, Rajesh Dhirawani
Rapid prototyping (RP) is a technique of manufacturing parts by the additive layer manufacturing technology; where, a three-dimensional (3D) model created in a computer aided design (CAD) system is sectioned into 2D profiles, which are further constructed by RP layer by layer. Its use is not limited to industrial or engineering fields and has extended to the medical field for the manufacturing of custom implants and prostheses, the study of anatomy and surgical planning. Nowadays, dentists are more frequently encountered with the individuals affected with craniofacial defects due to trauma...
January 2016: Journal of Dentistry of Tehran University of Medical Sciences
Laurens J Ceulemans, Nathalie P Deferm, Marc Miserez, Francesca Maione, Diethard Monbaliu, Jacques Pirenne
Intestinal transplantation (ITx) is often associated with decreased abdominal domain, rendering abdominal closure difficult. Pre-transplant placement of tissue expanders (TE) can overcome this challenge; however it can be associated with life-threatening complications. This review aimed to comprehensively summarize all available literature on TE in ITx candidates and include the technical details of osmotic, self-inflatable TE -a technique undescribed before. PubMed, EMBASE and CCTR were searched until April 30, 2016...
October 2016: Transplantation Reviews
Turki Almatani, Richard P Hugtenburg, Ryan D Lewis, Susan E Barley, Mark A Edwards
OBJECTIVE: Cone beam CT (CBCT) images contain more scatter than a conventional CT image and therefore provide inaccurate Hounsfield units (HUs). Consequently, CBCT images cannot be used directly for radiotherapy dose calculation. The aim of this study is to enable dose calculations to be performed with the use of CBCT images taken during radiotherapy and evaluate the necessity of replanning. METHODS: A patient with prostate cancer with bilateral metallic prosthetic hip replacements was imaged using both CT and CBCT...
October 2016: British Journal of Radiology
Henning Dathe, Clemens Dumont, Rainer Perplies, Jochen Fanghänel, Dietmar Kubein-Meesenburg, Hans Nägerl, Martin M Wachowski
PURPOSE: The purpose is to present a mathematical model of the function of the thumb carpometacarpal joint (TCMCJ) based on measurements of human joints. In the TCMCJ both articulating surfaces are saddle-shaped. The aim was to geometrically survey the shapes of the articulating surfaces using precise replicas of 28 TCMCJs. METHODS: None of these 56 articulating surfaces did mathematically extend the differential geometrical neighbourhood around the main saddle point so that each surface could be characterised by three main parameters: the two extreme radii of curvature in the main saddle point and the angle between the saddles' asymptotics (straight lines)...
2016: Acta of Bioengineering and Biomechanics
Simon Van Eyndhoven, Tom Francart, Alexander Bertrand
OBJECTIVE: We aim to extract and denoise the attended speaker in a noisy, two-speaker acoustic scenario, relying on microphone array recordings from a binaural hearing aid, which are complemented with electroencephalography (EEG) recordings to infer the speaker of interest. METHODS: In this study, we propose a modular processing flow that first extracts the two speech envelopes from the microphone recordings, then selects the attended speech envelope based on the EEG, and finally uses this envelope to inform a multi-channel speech separation and denoising algorithm...
July 7, 2016: IEEE Transactions on Bio-medical Engineering
Thomas C Spencer, James B Fallon, Patrick C Thien, Mohit N Shivdasani
PURPOSE: The resolution provided by present state-of-the-art retinal prostheses is severely limiting for recipients, partly due to the broad spread of activation in the retina in response to monopolar (MP) electrical stimulation. Focused multipolar (FMP) stimulation has been shown to restrict neural activation in the cochlea compared to MP stimulation. We extended the FMP stimulation technique to a two-dimensional electrode array and compared its efficacy to MP and hexapolar (HP) stimulation in the retina...
June 1, 2016: Investigative Ophthalmology & Visual Science
Miguel A Negrín, Julian Nam, Andrew H Briggs
OBJECTIVE: Survival extrapolation using a single, best-fit model ignores 2 sources of model uncertainty: uncertainty in the true underlying distribution and uncertainty about the stability of the model parameters over time. Bayesian model averaging (BMA) has been used to account for the former, but it can also account for the latter. We investigated BMA using a published comparison of the Charnley and Spectron hip prostheses using the original 8-year follow-up registry data. METHODS: A wide variety of alternative distributions were fitted...
June 8, 2016: Medical Decision Making: An International Journal of the Society for Medical Decision Making
Edward Feinberg
Passively retained precision attachment removable partial dentures have been used successfully since the 1920s. Adult cleft palate patients and accident victims often have endured a lifetime of wearing awkward appliances to replace the missing structures that never formed intraorally or were lost in a traumatic accident. These patients tend to be poor candidates for dental implants, even with repeated grafting surgeries. The anterior double-tilt precision attachment case is a great treatment option for adults to restore the missing dental structures...
January 2016: New York State Dental Journal
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