10,370 research outputs found

    Vergleich des Sprachverstehens im StörgerÀusch bei Cochlea Implantat TrÀgern mit unterschiedlichen Mikrophonen

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    Einleitung: Es wurden die Leistungen beim Verstehen im StörgerĂ€usch von CI-Patienten mit unterschiedlichen Implantattypen verglichen. Der TEMPO+ Sprachprozessor (MED-EL, Implantat C40+) verwendet ein Mikrophon mit Kugelcharakteristik, wĂ€hrend der ESPrit 3G Prozessor (COCHLEAR, Implantat CI24R(CA)) mit einem frontal ausgelegten Richtmikrophon ausgestattet ist. Methode: Von den zwei untersuchten Patientengruppen (n=20) war eine mit einem C40+ Implantat (MED-EL, Innsbruck), die andere mit dem CI24RCA Implantat (Cochlear, Melbourne) versorgt. Es wurde die S0N180 Lautsprecheranordnung im Freifeld fĂŒr den HSM-Test (Hochmair, Schulz und Moser, 1997) und die S0N0 Anordnung fĂŒr den Oldenburger Satztest (Wagener, KĂŒhnel und Kollmeier, 1999) verwendet. Der OLSA wurde mit festem Sprachpegel (65 dB SPL) und adaptivem StörgerĂ€usch durchgefĂŒhrt. Der HSM-Satztest wurde bei Signal-/ RauschverhĂ€ltnissen von 15 dB, 10 dB, 5 dB, 0dB sowie ohne StörgerĂ€usch durchgefĂŒhrt. Ergebnisse: Im HSM-Satztest (S0N180) wurden signifikant bessere Leistungen beim Verstehen im StörgerĂ€usch fĂŒr die Gruppe mit dem Richtmikrophon nachgewiesen. Im Oldenburger Satztest zeigten sich keine signifikanten Unterschiede. Schlussfolgerungen: Im Vergleich zu einem Mikrophon mit Kugelcharakteristik verbessert ein Richtmikrophon das Sprachverstehen in Situationen, in denen die Sprache frontal und der Störschall von hinten dargeboten werden

    PoreconÂź - Implantat and Fan Flap

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    Characterization of silicon-gate CMOS/SOS integrated circuits processed with ion implantation

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    Progress in developing the application of ion implantation techniques to silicon gate CMOS/SOS processing is described. All of the conventional doping techniques such as in situ doping of the epi-film and diffusion by means of doped oxides are replaced by ion implantation. Various devices and process parameters are characterized to generate an optimum process by the use of an existing SOS test array. As a result, excellent circuit performance is achieved. A general description of the all ion implantation process is presented

    Characterization of Fe implanted yttria-stabilized zirconia by cyclic voltammetry

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    The technique of cyclic voltammetry has been applied to study reduction and oxidation phenomena which are observed at low oxygen partial pressures during steady state current-overpotential measurements of the Au, O2(g)/Fe implanted yttria-stabilized zirconia interface. The redox potential (EO) of the observed redox couple is in close agreement with the thermodynamic potential of coexistent Fe2O3 and Fe3O4 phases. Hence in the forward sweep of the cyclic voltammogram, defined for negatively swept potential, part of the Fe3+ is reduced to Fe2+. The peak currents in the voltammogram result from a redox reaction which is rate limited by the diffusion of electrons or electron holes in the Fe implanted YSZ surface to the implanted Fe ions rather than by the diffusion of the Fe ions themselves

    The development of radiation resistant insulating layers for planar silicon technology, 29 May 1968 - 28 June 1969

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    Ion implantation method for improving radiation resistance of thermal oxides on silico

    Large area space solar cell assemblies

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    Development of a large area space solar cell assembly is presented. The assembly consists of an ion implanted silicon cell and glass cover. The important attributes of fabrication are (1) use of a back surface field which is compatible with a back surface reflector, and (2) integration of coverglass application and call fabrication

    Behandlingsutfall och patientupplevelse av datorplanerad implantat installation och direktbelastning med en prefabricerad brokonstruktion : efter 5 Ă„r

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    Aim: The aim of this study was to evaluate changes around immediately loaded implants inserted in edentate jaws with computer guided treatment planning and flapless surgery with conventional implant treatment, from 1 year to 5 years of function. The evaluation focused on marginal bone changes, soft tissue conditions and patients subjective experience of the implant treatment. Methods: Twelve edentulous patients (8 maxillae, 4 mandibles) were treated with 68 implants and were clinically examined. Patient subjective experience evaluation was performed with a questionnaire. Soft tissue conditions and radiographic marginal bone changes were analyzed after ≄1 year and ≄5 years of functional loading. Results: The mean probing depth was 3 mm. Bleeding on probing was recorded as a mean of 58%. Plaque Index showed a mean of 55%. The mean Implant Stability Quotient was 66 (SD = 7,11, range 63,1 - 71,8). The mean marginal bone level of measured implant sites evaluated on intraoral radiographs after five years was -0,67mm (SD: 0,55). Calculation of the mean marginal bone loss resulted in a mean of -0,055 mm/year. One patient was diagnosed with peri-implantitis. Conclusions: Immediately loaded implants inserted in edentate jaws with computer guided treatment planning and flapless surgery show equal results as implant placement with conventional smethods. Furthermore long-term follow up studies are needed of this surgical technique with immediate loaded constructions. All patients were very positive with the treatment results.Syfte:MĂ„let med denna studie var att utvĂ€rdera förĂ€ndringar frĂ„n ett Ă„r till fem Ă„r runt direktbelastade implantat som installerats i tandlösa kĂ€kar med hjĂ€lp av datorassisterad planering och lambĂ„fri kirurgi med implantat som installerats enligt konventionell metod. Undersökningen fokuserade pĂ„ marginala benförĂ€ndringar, mjukvĂ€vnadsförĂ€ndringar och patientens subjektiva upplevelse av implantat behandlingen. Metod: Tolv tandlösa patienter (8 maxillor, 4 mandiblar) behandlade med totalt 68 implantat undersöktes. Patienternas subjektiva upplevelser utvĂ€rderades med hjĂ€lp av en enkĂ€t undersökning. MjukvĂ€vnadsförhĂ„llanden och radiografiska marginala benförĂ€ndringar analyserades och jĂ€mfördes efter bĂ„de ≄1 Ă„rs och ≄5 Ă„rs belastning. Resultat: MedelvĂ€rdet av fickdjupsmĂ€tningen var 3 mm. BoP hade ett medelvĂ€rde pĂ„ 58 %. PI visade ett medelvĂ€rde pĂ„ 55 %. ISQ medelvĂ€rdet var 66 (SD = 7,11, range 63-72). Den marginala bennivĂ„n som uppmĂ€ttes radiografiskt kring implantaten efter 5 Ă„r visade en sĂ€nkt bennivĂ„ med -0,67mm (SD = 0,55). Den marginala benresorptionen berĂ€knades till ett medelvĂ€rde pĂ„ 0,055mm/Ă„r. Endast en patient utvecklade peri-implantit. Konklusion: Direktbelastade implantat som installerats i tandlösa kĂ€kar med hjĂ€lp av datorassisterad planering och lambĂ„fri kirurgi uppvisade liknande resultat som implantat inopererade med den konventionella metoden. Det behövs ytterligare forskning i form av lĂ„ngtids uppföljningar av denna kirurgiska teknik med direkt belastade konstruktioner. Alla patienter var nöjda med implantat behandlingen

    Designing a Compensated–Kidney Donation System

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    Osteochondral lesions of the talus (OLTs) are the third most common type of osteochondral lesion and can cause pain and instability of the ankle joint. Episurf Medical AB is a medical technology company that develops individualized implants for patients who are suffering from focal cartilage lesions. Episurf have recently started a project that aims to implement their implantation technique in the treatment of OLTs. This master thesis was a part of Episurf’s talus project and the main goal of the thesis was to find the optimal implantation angle of the Episurf implant when treating OLTs. The optimal implantation angle was defined as the angle that minimized the maximum equivalent (von Mises) strain acting on the implant shaft during the stance phase of a normal gait cycle. It is desirable to minimize the strain acting on the implant shaft, since a reduction of the strain can improve the longevity of the implant. To find the optimal implantation angle a finite element model of an ankle joint treated with the Episurf implant was developed. In the model an implant with a diameter of 12 millimeters was placed in the middle part of the medial side of the talar dome. An optimization algorithm was designed to find the implantation angle, which minimized the maximum equivalent strain acting on the implant shaft. The optimal implantation angle was found to be a sagittal angle of 12.5 degrees and a coronal angle of 0 degrees. Both the magnitude and the direction of the force applied to the ankle joint in the simulated stance phase seemed to influence the maximum equivalent strain acting on the implant shaft. A number of simplifications have been done in the simulation of this project, which might affect the accuracy of the results. Therefore it is recommended that further, more detailed, simulations based on this project are performed in order to improve the result accuracy.Fokala broskskador pĂ„ talusbenet Ă€r den tredje vanligaste typen av fokala broskskador och kan ge upphov till smĂ€rta och instabilitet av fotleden. Episurf Medical AB Ă€r ett medicintekniskt företag som utvecklar individanpassade implantat för patienter med fokala broskskador. Episurf har nyligen pĂ„börjat ett projekt dĂ€r deras teknik ska anvĂ€ndas i behandlingen av fokala broskskador pĂ„ talusbenet. Den hĂ€r masteruppsatsen var en del i Episurfs talusprojekt och dess huvudmĂ„l var att finna den optimala implantationsvinkeln av Episurfs implantat i behandlingen av fokala broskskador pĂ„ talusbenet. Den optimala implanteringsvinkeln definierades som den vinkel som minimerade den effektiva von Mises-töjningen som verkade pĂ„ implantatskaftet under stance-fasen i en normal gĂ„ngcykel. Det Ă€r efterstrĂ€vansvĂ€rt att minimera belastningen pĂ„ implantatskaftet eftersom en reducering av belastningen kan förbĂ€ttra implantatets livslĂ€ngd. En finita element-modell av en fotled behandlad med Episurfs implantat utvecklades för att för att finna den optimala implantationsvinkeln. I modellen placerades ett implantat med en diameter pĂ„ 12 millimeter pĂ„ mittendelen av talus mediala sida. En optimeringsalgoritm utformades för att finna implantationsvinkeln som minimerade den effektiva von Mises-töjningen pĂ„ implantatskaftet. Den funna optimala implantationsvinkeln bestod av en vinkel pĂ„ 12.5 grader i sagittalplan och en vinkel pĂ„ 0 grader i koronalplan. BĂ„de storleken och riktningen pĂ„ kraften som applicerats pĂ„ fotleden under den simulerade stance-fasen av gĂ„ngcykeln verkade pĂ„verka belastningen pĂ„ implantatskaftet. Ett antal förenklingar har gjorts i projektets simuleringar, vilket kan pĂ„verka noggrannheten i resultatet. DĂ€rför rekommenderas att ytterligare, mer detaljerade simuleringar baserade pĂ„ det hĂ€r projektet görs för att förbĂ€ttra resultatets noggrannhet

    Minimierung der krestalen Knochenresorption

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