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Sample records for herzens nach implantation

  1. Vivos Voco: Herzen's Past, Present, and Future

    Directory of Open Access Journals (Sweden)

    Kathleen Frances Parthe

    2014-11-01

    Full Text Available A close reading of the journalism, correspondence, and memoirs of Alexander Herzen (1812–1870 yields a finely tuned relationship to past, present, and future, but not a complete philosophy of history. Herzen described no system, but repeated key metaphors (e.g., the libretto and concepts (e.g. contingency that reflected his understanding of the historical process. For Herzen, history became interesting when it was relieved of predetermined plots and algebraic formulas. However much he studied Russia’s past and planned its future, his preference was for the present, where freedom is most fully experienced in debate and in the need to choose a path forward. He understood the instrumentality of history in how the lives of ordinary people were affected, which remained his measure of progress. Herzen was a “historian of the present,” and his insights are remarkably applicable to twenty-first-century Russia.

  2. Un duel entre deux romantiques : Herzen et Herwegh

    OpenAIRE

    Schmid, Ulrich

    2012-01-01

    Between 1849 and 1852, Herzen experienced a family drama that acquired symbolical meaning for his interpretation of the failed 1848 revolutions in Europe. The German revolutionary bard Georg Herwegh, originally a brother in arms for Herzen's cause, had intruded into his marriage and seduced his wife Natalie who in November 1849 had a miscarriage ― the child was probably Herwegh's, and Herzen would not know about this unborn child during his lifetime. Both authors couched the family drama into...

  3. Oszillationen der QT-Zeit nach ventrikulären Extrasystolen zur nichtinvasiven Risikostratifizierung von Patienten nach Myokardinfarkt

    OpenAIRE

    Kraus, Martin

    2010-01-01

    Imbalancen im Bereich der autonomen Innervation des Herzens auf Sinusknotenebene zeigen sich anhand des Fehlens der „heart rate variability“ und der „heart rate turbulence“ und werden bereits zur Risikoeinschätzung von KHK-Patienten herangezogen, während Untersuchungen zur autonomen Dysbalance auf Ventrikelebene bisher kaum durchgeführt wurden. Daher war das Ziel dieser Arbeit eine Risikostratifizierung von Patienten nach einem Myokardinfarkt anhand dynamischer Veränderungen der QT-Zeit, zu d...

  4. MRI and MRS in patients with silicon implants of the breast; MRT und MRS nach Silikonaufbau der weiblichen Brust

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    Pfleiderer, B.; Heindel, W. [Muenster Univ. (Germany). Radiologische Klinik und Poliklinik

    2001-07-01

    This paper reviews the evaluation of the breast of women by MR-techniques after implantation with silicon gel protheses. The main topics are the diagnosis of implant defects such as extensive ''gel bleed'' and intra- and extracapsular ruptures. Moreover, the MR-detection of siliconomas (encapsulated silicone) and differentiation from malignomas as well as MR-features of chronic foreign body reactions are presented. ''Gel bleed'' is difficult to diagnose unambiguously by MRI alone. The ''linguini'' sign is the only reliable mans to diagnose intracapsular ruptures. The presence of silicone outside the implant capsule indicates extracapsular rupture. The MR-spectroscopic detection of silicone in the liver suggests after short implantation times and a normal MR scan the diagnosis ''gel bleed'', and after longer implantation times of more than 10 years and missing ''linguini'' sign the diagnosis of ruptures due to a dissolved shell of the implant. MRI, in comparison to other imaging modalities, has the highest specificity and sensitivity in the diagnosis of implant defects. Due to its high costs, however, MR is not suitable as a screening tool and should only be used in cases of sonographic suspected rupture or after radical mastectomy. In these cases MRI is the method of choice. (orig.) [German] In dieser Uebersicht wird die Evaluation der weiblichen Brust nach Aufbau mit Silikonmammaprothesen mittels MR-Techniken vorgestellt. Ein Schwerpunkt liegt dabei auf der Defektdiagnostik, d.h. dem Nachweis des so genannten ''Gelblutens'', der intra- und der extrakapsulaeren Ruptur. Daneben wird auf die MR-Detektion von Silikonomen (abgekapseltes Silikon) und deren Abgrenzung von einem Malignom eingegangen und das typische MR-Erscheinungsbild von chronischer Fremdkoerperreaktion vorgestellt. ''Gelbluten'' ist mittels MR-Bildgebung (MRT

  5. Cardiac MRI in suspected myocarditis; MRT des Herzens bei Verdacht auf Myokarditis

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    Rieker, O.; Oberholzer, K.; Kreitner, K.F.; Thelen, M. [Klinik fuer Radiologie der Johannes Gutenberg-Univ. Mainz (Germany); Mohrs, O. [Klinik fuer Radiologie der Johannes Gutenberg-Univ. Mainz (Germany); Cardioangiologisches Centrum Bethanien, Frankfurt (Germany)

    2002-12-01

    Purpose: To evaluate the potential of ECG-gated breath-hold MRI in diagnosing acute myocardidits. Material and methods: Cardiac MRI was performed on 21 consecutive patients with suspected myocarditis. ECG-gated breath-hold T2-weighted images with fat suppression were acquired in 3 standard views. T1-weighted imaging (FLASH) was performed 10 min after IV administration of Gd-DTPA. Laboratory data included creatine kinase, troponin T and serological tests, ECG findings and echocardiography. Imaging findings were retrospectively compared to the discharge diagnoses. Signal alterations were semiquantitatively classified. Results: Acute myocarditis was diagnosed in 9 patients and cardiac sarcoidosis in 2 patients. Late enhancement was observed in 4 patients with acute myocarditis and in both patients with cardiac sarcoidosis. Semiquantitative evaluation revealed 9 true positive, 9 true negative, 1 false positive and 2 false negative results. Conclusion: Cardiac MRI has the potential to detect acute myocarditis and to diagnose cardiac sarcoidosis. Late enhancement of Gd-DTPA can be found in both viral myocarditis and cardiac sarcoidosis. (orig.) [German] Ziel: Beurteilung des diagnostischen Potenzials der MRT des Herzens bei Verdacht auf akute Myokarditis. Material und Methoden: 21 konsekutive Patienten mit Verdacht auf Myokarditis wurden mit einem standardisierten Protokoll untersucht. Zunaechst wurden T{sub 2}-gewichtete, EKG-getriggerte fettsupprimierte Sequenzen in den 3 Standardebenen angefertigt. 10 Minuten nach intravenoeser Injektion von GD-DTPA wurden T{sub 1}-gewichtete TurboFLASH-Sequenzen angefertigt. Von allen Patienten wurden EKG, Echokardiographie und die Laborbefunde einschliesslich Creatinin-Kinase, Troponin T und der Infektionsserologie protokolliert. Das Ausmass der Signalveraenderungen im MRT wurde semiquantitativ klassifiziert. Die Ergebnisse der MRT wurden retrospektiv mit den Entlassungsdiagnosen korreliert. Ergebnisse: Bei 9 Patienten lag nach

  6. Transplantationsosteopathie: Knochenstoffwechsel nach Nierentransplantation

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    Kovarik J

    2001-01-01

    Full Text Available Die Osteopathie nach Nierentransplantation ist eine klinische Entität, als deren wesentlichste ätiologische Faktoren einerseits die Persistenz des sekundären Hyperparathyreoidismus, andererseits die Immunsuppression verantwortlich gemacht werden. Nierentransplantierte Patienten zeichnen sich außerdem dadurch aus, daß ihre Knochenerkrankung auf der Basis einer präexistenten renalen Osteopathie entsteht. Daten über die renale Posttransplantationsosteopathie sind in der Literatur dürftig und zum Teil kontrovers abgehandelt. Grund dafür sind inhomogene Patientengruppen, die Verwendung unterschiedlicher immunsuppressiver Protokolle, unterschiedliche Diagnosewege und Diagnosekriterien sowie das Fehlen prospektiver Untersuchungen.

  7. Osteopathien nach Lungentransplantation

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    Aringer M

    1999-01-01

    Full Text Available Mit der immer besser werdenden Lebenserwartung von Patienten nach Lungentransplantation gewinnen knöcherne Komplikationen an Bedeutung. Parallel zu anderen Gruppen haben wir die Häufigkeit von Frakturen, die Knochendichte und Knochenstoffwechselparameter von in Wien transplantierten Patienten untersucht. Aus dieser Querschnittsstudie geht eine extrem hohe Osteopathie-Prävalenz hervor, viele Patienten weisen einen Vitamin D-Mangel auf. Der Knochenstoffwechsel ist gesteigert, teilweise im Zusammenhang mit einem sekundären Hyperparathyreoidismus. Wir diskutieren hier unsere Resultate vor dem Hintergrund der anderen publizierten Untersuchungen.

  8. Magnet discolation - An increasing and serious complication following MRI in patients with chochlear implants; Magnetdiskolation - eine zunehmende und folgenreiche Komplikation nach MRT bei Patienten mit Cochlea Implantat

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    Hassepass, F.; Staubenau, V.; Arndt, S.; Beck, R.; Grauvogel, T.; Aschendorff, A. [Univ. Medical Center Freiburg (Germany). Dept. of Otorhinolaryngology-Head and Neck Surgery; Bulla, S. [Univ. Medical Center Freiburg (Germany). Dept. of Diagnostic Radiology

    2014-07-15

    Cochlear implantation (CI) represents the gold standard in the treatment of children born deaf and postlingually deafened adults. Initial magnetic resonance imaging (MRI) was contraindicated in CI users. Meanwhile, there are specific recommendations concerning MRI compatibility depending on the type of CI system and the device manufacturer. Some CI systems are even approved for MRI with the internal magnet left in place. The aim of this study was to analyze all magnet revision surgeries in CI patients at one CI center and the relationship to MRI scans over time. Between 2000 and 2013, a total of 2027 CIs were implanted. The number of magnet dislocation (MD) surgeries and their causes was assessed retrospectively. In total 12 cases of MD resulting from an MRI scan (0.59 %) were observed, accounting for 52.2 % of all magnetic revision surgeries. As per the labeling, it was considered safe to leave the internal magnet in place during MRI while following specific manufacturer recommendations: MRI intensity of 1.5 Tesla (T) and compression head bandage during examination. A compression head bandage in a 1.5 T MRI unit does not safely prevent MD and the related serious complications in CI recipients. We recommend a Stenvers view radiograph after MRI with the internal magnet in place for early identification of MD, at least in the case of pain during or after MRI examination. MRI in CI patients should be indicated with restraint and patients should be explicitly informed about the possible risks. Recommendations regarding MRI compatibility and the handling of CI patients issued with MRI for the most common CI systems are summarized.

  9. Periodismo ruso en el exilio: Alexánder Ivánovich Herzen (1812-1870

    Directory of Open Access Journals (Sweden)

    Miguel Vázquez Liñán

    2006-01-01

    Full Text Available El siguiente artículo se interesa por la actividad periodística de Alexánder Ivánovich Herzen (Moscú, 1812 – París, 1870 y reproduce un texto suyo de 1857, que sirvió como presentación de una de sus publicaciones más representativas: Kólokol (La Campana.The following article analyses the journalistic work of Alexander Ivanovich Herzen,and reproduce one of his articles of 1857, specifically the introducction to Kolokol (The Bell, one of his most representative publications.

  10. Assessment of myocardial metabolism by positron emission tomography; Stoffwechseluntersuchungen des Herzens mit der Positronenemissionstomographie

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    Bengel, F.M.; Schwaiger, M. [Technische Univ. Muenchen (Germany). Nuklearmedizinische Klinik und Poliklinik

    1999-06-01

    In combination with a variety of tracers, positron emission tomography does provide noninvasive quantitative information not only about myocardial utilisation of substrates such as glucose or free fatty acids, but also about overall oxidative metabolism. PET studies of myocardial metabolism have substantially contributed to an improved understanding of regulatory mechanism as well as interaction between different substrates under normal conditions as well as under pathologic conditions such as ischemia, heart failure or diabetes mellitus, and will continue to do so in the future. (orig.) [German] Fuer die Positronenemissionstomographie stehen verschiedene Tracer zur Verfuegung, die am menschlichen Herzen nichtinvasive Quantifizierung der Utilisation von Substraten wie Glukose oder freien Fettsaeuren, aber auch des gesamten sauerstoffabhaengigen Metabolismus ermoeglichen. Stoffwechseluntersuchungen des Herzens mit der PET haben zu einem genaueren Verstaendnis von Regulationsmechanismen und Interaktionen zwischen verschiedenen Substraten sowohl im Normalzustand als auch unter pathologischen Bedingungen wie etwa bei ischaemischen Syndromen, Herzinsuffizienz oder Diabetis mellitus beigetragen. Insbesondere durch Untersuchungen von metabolischen Auswirkungen verschiedener Therapieansaetze bei Herzerkrankungen und zur Vorhersage der Effektivitaet solcher therapeutischer Strategien kann die PET auch in Zukunft einen Beitrag zur Weiterentwicklung der Kardiologie leisten. (orig.)

  11. Späte Seed-Migration nach LDR-Brachytherapie der Prostata mit I125-Permanentimplantaten

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    Maletzki P

    2015-01-01

    Full Text Available Hintergrund: Nach einer „Lowdose-rate“- (LDR Brachytherapie der Prostata kommt es häufig zu einer Seed-Migration. Trotz mehrerer Arbeiten über eine Seed-Migration in der frühen postoperativen Phase nach Seed-Implantation gibt es bisher nur wenige Daten über eine Seed-Migration mehrere Jahre nach erfolgter Intervention. Unser Ziel war eine Datenerhebung zur Inzidenz, Lokalisation, Symptomatik und therapeutischen Konsequenz einer späten Seed-Migration 3 Jahre nach Seed-Implantation. Methoden: Wir untersuchten retrospektiv 63 unselektionierte Patienten, die mittels transrektaler, Ultraschall-gesteuerter, transperinealer interstitieller LDR-Brachytherapie der Prostata zwischen 2001 und 2010 behandelt wurden. Es wurden hierbei verknüpfte („stranded“ Seeds verwendet. Am ersten Tag nach der Intervention erfolgte eine Symphysenzielaufnahme und 6 Wochen postoperativ eine erneute Symphysenzielaufnahme in Kombination mit einem CT/MRI des Beckens mit Bildfusionstechnik zur dosimetrischen Untersuchung. Die radiologische Spätkontrolle wurde mehr als 3 Jahre postoperativ mittels einer Symphysenzielaufnahme und eines Thorax-Röntgens durchgeführt. Ergebnisse: Mehr als 3 Jahre nach Brachytherapie zeigten 36 der 63 Patienten (57 % einen Seed-Verlust. Die Anzahl fehlender Seeds lag zwischen 1 und 9. Neben einer frühen Seed-Migration zeigte sich eine späte Seed-Migration bei 2 der 36 Patienten (6 % mit Migration in die Lunge, Leber und das kleine Becken. Alle Spätmigrationen waren asymptomatisch und ohne therapeutische Konsequenz. Diskussion: Neben häufig auftretenden Seed-Verlusten scheint eine Seed-Migration mehrere Jahre nach erfolgter Implantation eine seltene Erscheinung zu sein. Langzeitkontrollen mit ergänzenden radiologischen Nachuntersuchungen könnten dennoch hilfreich zur Dokumentation einer relevanten Seed-Migration sein.

  12. MR stress perfusion for the detection of flow-limiting stenoses in symptomatic patients with known coronary artery disease and history of stent implantation; MR-Stressperfusion zur Vorhersage flusslimitierender Stenosen bei symptomatischen Patienten mit bekannter KHK nach Stentimplantation

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    Seeger, A.; Klumpp, B.; Kramer, U.; Fenchel, M.; Claussen, C.D.; Miller, S. [Universitaetsklinikum Tuebingen (Germany). Radiologische Diagnostik; Doesch, C.; Hoevelborn, T.; Gawaz, M.; May, A.E. [Universitaetsklinikum Tuebingen (Germany). Innere Medizin III

    2007-10-15

    Purpose: The aim of the present study was to determine the correlation of myocardial perfusion MR imaging (MPMRI) and coronary angiography for the detection of flow-limiting stenosis in symptomatic patients with known coronary artery disease and a history of intervention. Materials and Methods: MPMRI was performed in 51 symptomatic patients (44 male, 64.7 {+-} 9.5 years) with known coronary artery disease and a history of stent implantation (between 5 years and 2 weeks prior to MRI). Malperfused myocardial regions were correlated with findings of coronary angiography. A stenosis of > 70 % was regarded as hemodynamically significant. Results: In MPMRI 37 patients (73 %) showed a stress induced perfusion deficit. In 35 of these patients coronary angiography revealed a stenosis of > 70 %. A total of 38 patients (75 %) showed stenoses of > 70 %. MPMRI yielded a sensitivity of 92 % with a specificity of 85 %. The positive predictive value was 95 % and negative predictive value was 79 %. The assignment of malperfused segments to coronary artery territories was carried out according to the standardized myocardial model of the American Heart Association (sensitivity/specificity was 59/85 % for RCA, 79/81 % for LAD and 54/68 % for LCX). Conclusion: MPMRI is a suitable non-invasive method for detecting flow-limiting coronary artery stenoses in patients with a history of stent implantation. (orig.)

  13. Von Kalifornien nach Taxham / Katri Soe

    Index Scriptorium Estoniae

    Soe, Katri, 1971-

    2005-01-01

    Neljas osa magistritööst "Von Kalifornien nach Taxham: Formen und Strukturen der Kommunikation in Peter Handkes Romanen "Der kurze Brief zum langen Abschied" und "In einer dunklen Nacht ging ich aus meinem stillen Haus"" (Tartu, 2000. Juhendaja: Claus Sommerhage)

  14. Imaging after lever transplatation; Bildgebung nach Lebertransplantation

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    Turetschek, K. [Universitaetsklinik fuer Radiodiagnostik, Wien (Austria). Abt. fuer Konservative Faecher; Schima, W. [Universitaetsklinik fuer Radiodiagnostik, Wien (Austria). Abt. fuer Konservative Faecher; Stift, A. [Universitaetsklinik fuer Chirurgie, Wien (Austria); Schober, E. [Universitaetsklinik fuer Radiodiagnostik, Wien (Austria). Abt. fuer Konservative Faecher; Dock, W. [Universitaetsklinik fuer Radiodiagnostik, Wien (Austria). Abt. fuer Chirurgische Faecher; Mostbeck, G. [Universitaetsklinik fuer Radiodiagnostik, Wien (Austria). Abt. fuer Konservative Faecher

    1997-03-01

    . Material und Methode: Es wurden im eigenen Krankengut die postoperativen Komplikationen nach OLT retrospektiv ausgewertet. Die Duplexsonographie und die Cholangiographie erwiesen sich als die primaeren Untersuchungsmethoden der Wahl zum Nachweis vaskulaerer oder biliaerer Komplikationen. CT, MRI und die Angiographie waren in Problemfaellen wertvolle additive bildgebende Verfahren zur Diagnosesicherung. Ergebnisse: Nach der primaeren Organdysfunktion sind die vaskulaeren Komplikationen als haeufigste Ursache fuer den Verlust des Spendeorgans anzufuehren. Die Thrombose der A. hepatica ist die haeufigste vaskulaere Komplikation mit einer Inzidenz von 4-42%. Galleleaks, -sludge und -strikturen sind haeufige Komplikationen, die letztlich zu einer Dysfunktion des transplantierten Organs fuehren koennen. Biliaere Komplikationen treten gehaeuft in den ersten 3 Monaten auf und erfordern eine interventionelle oder chirurgische Therapie. Da Patienten nach OLT einer immunsuppressiven Therapie unterliegen, sind sie einem erhoehten Risiko einen lymphoproliferativen Tumor zu entwickeln ausgesetzt. Diese Posttransplant-Tumore koennen mit US, CT und MRI ausgezeichnet abgegrenzt werden, erfordern jedoch eine Sicherung der Diagnose durch eine Feinnadelpunktion. Schlussfolgerung: Die postoperative Verlaufskontrolle und der Nachweis von Komplikationen nach OLT ist eine Domaene von Cholangiographie und Duplexsonographie. In Problemfaellen kommen CT, MRI und Angiographie zum Einsatz. (orig.)

  15. Interhemisphärische Interaktionen nach Schlaganfall

    OpenAIRE

    Srulijes, Karin Veronika

    2010-01-01

    Die nach einem Schlaganfall bei Bewegung der paretischen Hand verstärkte Aktivierung der ungeschädigten Hemisphäre wird in einer Hypothese durch plastische Reorganisation homologer Areale in dieser ungeschädigten Hemisphäre erklärt, begünstigt durch eine Reduktion der inhibitorischen Verbindungen von geschädigter zu ungeschädigter Hemisphäre. Eine andere Hypothese postuliert, dass die verstärkte Aktivierung der ungeschädigten Hemisphäre mit einer verstärkten Inhibition dieser auf die geschädi...

  16. 76 FR 77696 - Establishment of the Naches Heights Viticultural Area

    Science.gov (United States)

    2011-12-14

    .... Also, a general Internet search for ``Naches Heights'' produced many hits relating to the geographical... Cascades, deep beds of unique soils formed in the loess pockets on the plateau. The predominant soils on... Naches Heights plateau landform, according to the NRCS web soil survey, has generally deep loess soils...

  17. Diabetesmanagement nach Pankreatektomie // Diabetes treatment after pancreatectomy

    Directory of Open Access Journals (Sweden)

    Weitgasser R

    2016-01-01

    Full Text Available Dependent on morbidity – pancreatectomy due to a benign or malignant disease – and life expectancy of the patient the individual treatment goal has to be determined. Before pancreatectomy is planned the potential for an autologous islet transplantation should be evaluated. After partial pancreatectomy and still sufficient insulin secretion, treatment according to current ADA/EASD consensus recommendations respectively the guidelines of the Austrian Diabetes Association (ÖDG should be planned.brFollowing total pancreatectomy insulin treatment becomes necessary. As in addition to insulin deficiency glucagon secretion is lacking, high blood glucose excursions are predominant and patients after pancreatectomy are endangered for recurrent severe hypoglycaemic reactions. To cope with this situation, a basal-bolus insulin treatment regimen using multiple daily injections or an insulin pump is recommended. To achieve good glycaemic control a comprehensive diabetes education which enables the patient to regulate diet and daily insulin doses adequately is important. Besides frequent blood glucose measurements the use of continuous glucose monitoring systems (CGM may be useful to support diabetes treatment of these patients in daily life. p bKurzfassung: /bIn Abhängigkeit von der Morbidität – handelt es sich um eine benigne oder maligne Ursache für die Pankreasoperation – und die daraus resultierende Lebenserwartung ist das individuelle Diabetes-Therapieziel festzulegen. Bei geplanter Pankreatektomie sollte die präoperative Evaluierung für eine autologe Inselzelltransplantation erwogen werden. Nach partieller Pankreatektomie und verbleibender ausreichender Insulinsekretion ist eine medikamentöse Therapie entsprechend den aktuellen ADA/EASD-Empfehlungen bzw. den Leitlinien der Österreichischen Diabetes-Gesellschaft (ÖDG vorzuschlagen.brNach totaler Pankreatektomie ist immer eine Insulintherapie nötig. Bei zusätzlich zum Insulinmangel

  18. Radiological and clinical results at three to six years after noncemented implantation of hip endoprosthesis, obtained with the EBRA system, measuring migration and PE wear; Radiologische und klinische Drei- bis Sechs-Jahresergebnisse nach Implantation einer zementfreien Hueftendoprothese unter Verwendung des EBRA-Systems zur Messung von Migration und Polyethylenabrieb

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    Menzel, N.

    2003-02-01

    The present study reviews the mid-term outcome of ABG endoprostheses implanted between 1992 and 1999 at the orthopaedic department of Mainz University Hospital. The registered trade name of the system used for this retrospective analysis is EBRA, which means 'single-X-ray analysis'. (orig./CB) [German] Die vorliegende Studie untersucht die mittelfristigen Ergebnisse der von 1992 bis 1999 in der Orthopaedie der Universitaetsklinik Mainz implantierten ABG-Implantate, die retrospektiv mittels der Ein-Bild-Roentgen-Analyse (EBRA) betrachtet werden. (orig./AJ)

  19. Zuwanderung nach Österreich. Integrationspolitische Herausforderungen

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    Heinz Faßmann

    2016-12-01

    Full Text Available ENGLISH: Since the early 1960ies, Austria has become an immigration country against its will. In the beginning, the migration of Guestworkerswas a flexible supplement of the national labour market. Gradually it developed towards a permanent immigration.With the accession to the European Union Austria became a part of the common European migration era. The immigration fromthird countries lost importance, the immigration from other member states gained. Beside, Austria was always a target countryfor asylum seekers. The structural characteristics of the immigrants as well as the historical context showed some changes. Therefore,the integration processes happened differently. While the integration of the immigrants from other member states –especially from Germany – performed conflict – free and quick, the integration of the guestworkers and their descendants proceededonly stepwise. A similar stepwise and long lasting integration process can be expected for the asylum seekers due totheir qualification and their cultural background. Therefore, the cultural diversity will increase and it is not always an enrichmentonly, but also a reason of conflicts about the valid societal perspectives. DEUTSCH: Österreich hat sich seit den 1960er zu einem Einwanderungsland wider Willen entwickelt. Anfangs war die Zuwanderung vonGastarbeiterInnen eine flexible Ergänzung des nationalen Arbeitsmarktes. Nach und nach entwickelte sich daraus aber eine dauerhafteZuwanderung. Mit dem Beitritt zur Europäischen Union wurde Österreich auch Teil eines Europäischen Wanderungsraums.Die Zuwanderung aus den Drittstaaten verlor an Bedeutung, die Zuwanderung aus anderen Mitgliedstaaten der EuropäischenUnion wurde wichtiger. Daneben war Österreich auch immer wieder Aufnahmeland von Asylwerbern. Die strukturellenMerkmale der Zugewanderten und der zeitliche Kontext der Zuwanderung waren ungleich. Daher verliefen auch die Integrationsprozessesehr unterschiedlich. W

  20. Perfusion MR imaging of the heart with TrueFISP; MR-Perfusionsbildgebung des Herzens mit TrueFISP

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    Schreiber, W.G.; Schmitt, M.; Kalden, P.; Mohrs, O.; Kreitner, K.F.; Thelen, M. [Mainz Univ. (Germany). Klinik und Poliklinik fuer Radiologie; Horstick, G.; Gumbrich, T.; Petersen, S.; Voigtlaender, T. [Mainz Univ. (Germany). Medizinische Klinik

    2001-03-01

    Kontrastmittelkonzentration und Signalintensitaet auf. Die SR-Trufi-Aufnahmen hatten eine fuer Perfusionsmessungen gute Bildqualitaet und hohe Ortsaufloesung von 2,1 mm x 2,1 mm. Unterschiede zwischen der Kontrastmittelkinetik in einem subendokardialen Perfusionsdefekt und dem benachbarten normal perfundierten Myokard konnten sowohl auf den SR-Trufi-Aufnahmen als auch in Signal-Zeit-Kurven aus einer Region-of-Interest-Analyse nachgewiesen werden. Schlussfolgerungen: Die SR-Trufi-Sequenz ist eine interessante neue Technik zur Untersuchung der Mikrozirkulation des Herzens an speziellen kardiovaskulaeren MR-Systemen. (orig.)

  1. Digital full field mammography for imaging augmented breasts; Digitale Vollfeldmammographie nach Brustaugmentation

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    Diekmann, S.; Diekmann, F.; Hamm, B. [Institut fuer Radiologie, Universitaetsklinikum Charite, Berlin (Germany); Hauschild, M. [Klinik fuer Frauenheilkunde und Geburtshilfe, Universitaetsklinikum Charite, Berlin (Germany)

    2002-04-01

    Purpose. The use of digital full field mammography for imaging augmented breasts.Methods. Images of a sponge, as a tissue equivalent, partly covered with one of three different implants (silicone, silicone/saline, saline) were obtained using digital and film-screen technique. The visualisation of the sponge structure covered by the implant and next to the implant was evaluated by two radiologists. Results were compared to clinical results from 35 patients with implants.Results. Two images with different parameter settings have to be obtained to visualize the covered sponge structure and the structure around the implant with film-screen technique. Digital mammography allows assessment of both areas using one image at different window settings. The assessability of covered structures depends on the type of implant. These results are in keeping with our clinical experiences.Conclusion. Digital mammography allows equal or better assessment of covered and non-covered tissue in augmented breasts without the need for additional exposures. (orig.) [German] Fragestellung. Anwendung der digitalen Vollfeldmammographie nach Mammaaugmentation mit verschiedenen Implantaten.Methodik. In einem Phantomversuch wurde ein Schwamm (Gewebeaequivalent) ueberlagert von 3 verschiedenen Implantaten (Silikon, Silikon/Kochsalz, Kochsalz) in konventioneller und digitaler Technik mit gleichen Parametern geroentgt. Es wurde die Beurteilbarkeit der Schwammstruktur neben und unter dem Implantat in beiden Techniken durch 2 Reader geprueft und den klinischen Erfahrungen bei 35 Patientinnen mit Mammaaugmentation gegenuebergestellt.Ergebnisse. Fuer die Beurteilung von verdecktem Gewebe und unverdecktem Gewebe (simuliert durch den Schwamm) muessen mit konventioneller Film-Folien-Technik zumindest 2 Aufnahmen mit verschiedenen Belichtungsparametern erstellt werden, waehrend durch eine geeignete Fensterung beides mit einer digitalen Aufnahme beurteilt werden kann. Die Beurteilbarkeit der ueberlagerten

  2. Kasuistik 3: 49-jähriger Patient mit Zustand nach Ablatio testis links nach Trauma und späterer Ablatio testis rechts nach Seminom

    Directory of Open Access Journals (Sweden)

    Wetterauer U

    2003-01-01

    Full Text Available 49-jähriger Patient, der als Kind ein Hodentrauma links erlitten hatte, was zur Ablatio testis führte. Mit 34 Jahren kam es bei einem organbegrenzten Hodentumor (Seminom zum Verlust des kontralateralen Hodens. Zunächst erfolgte über 4-5 Jahre keine Hormonsubstitution. Der Patient erinnert sich an eine deutlich reduzierte Leistungsfähigkeit und einen Libidoverlust mit depressiven Verstimmungen. Die Muskulatur hätte abgenommen. Gleichzeitig hätten Gelenkbeschwerden bestanden. Eine Diagnostik sei damals nicht erfolgt. Nachdem er dann wieder einen Urologen aufgesucht habe, sei eine Testosteronsubstitution in Form einer Injektion durchgeführt worden. Die bisherige Therapie bestand in der Injektion von Testosteronenantat 250 mg alle 4 Wochen. Hierunter hätte sich die Libido wieder teilweise verbessert. Insbesondere in den ersten zwei Wochen nach Injektion wäre die Libido normal und die Sexualität zufriedenstellend gewesen. Die Muskulatur habe mit zusätzlichem körperlichen Training auch wieder zugenommen. In der dritten Woche nach der i.m.-Injektion ließen die Leistungsfähigkeit und die Libido wieder nach und es traten depressive Verstimmungen auf. Gelegentlich seien Hitzewallungen hinzugekommen.

  3. Endovascular brachytherapy to prevent restenosis after angioplasty; Endovaskulaere Brachytherapie in der Restenoseprophylaxe nach Angioplastie und Stentimplantation: Eine Uebersicht

    Energy Technology Data Exchange (ETDEWEB)

    Wohlgemuth, W.A.; Bohndorf, K. [Klinikum Augsburg (Germany). Klinik fuer Diagnostische Radiologie und Neuroradiologie

    2003-02-01

    Endovascular radiotherapy is the first effective prophylaxis of restenosis after percutaneous transluminal angioplasty (PTA) and stenting. The FDA recently approved two devices for the delivery of intracoronary radiation following coronary artery stenting. Published multicenter, double-blind, randomized trials of intracoronary radiation therapy report good results for preventing in-stent restenosis, while the data for the peripheral circulation are still inconclusive. Beta-emitters are easier applicable and probably also safer, whereas gamma-emitters have been more extensively evaluated clinically so far. Primary indication for endovascular brachytherapy are patients at high risk for restenosis, such as previous restenoses, in-stent hyperplasia, long stented segment, long PTA lesion, narrow residual vascular lumen and diabetes. Data from coronary circulation suggest a safety margin of at least 4 to 10 mm at both ends of the angioplastic segment to avoid edge restenosis. To prevent late thrombosis of the treated coronary segment, antiplatelet therapy with clopidogrel and aspirin are recommended for at least 6 months after PTA and for 12 months after a newly implanted stent. An established medication regimen after radiotherapy of peripheral arteries is still lacking. (orig.) [German] Die endovaskulaere Radiotherapie stellt das erste erfolgreiche Therapiekonzept in der Restenoseprophylaxe nach PTA und Stentimplantation dar. Am 3.11.2000 hat die amerikanische Food and Drug Administration erstmalig zwei Brachytherapiegeraete zur Restenoseprophylaxe nach Koronararterien-Stenting zugelassen. Grosse multizentrische, kontrollierte Studien wurden fuer das koronare Stromgebiet mit positiven Ergebnissen publiziert, die Datenlage im peripheren Stromgebiet ist noch ungenuegend. Beta-Strahler bieten Vorteile in der Anwendung, moeglicherweise auch in der Sicherheit, Gamma-Strahler dagegen sind besser klinisch evaluiert. Die primaere Indikation zur endovaskulaeren Brachytherapie

  4. Herzrhythmusstörungen bei Kindern nach Stromunfall im Niederspannungsbereich

    OpenAIRE

    Widmann, Eric Thomas

    2016-01-01

    Die Dissertation setzt sich mit den Folgen eines Stromunfalls bei Kindern im Niederspannungsbereich auseinander. Sie untersucht die Inzidenz von Herzrhythmusstörungen und die Notwendigkeit einer kardialen Überwachung. Es wurde auch geprüft, ob bestimmte Faktoren mit einer erhöhten Inzidenz von Herzrhythmusstörungen einhergehen. Für die Arbeit wurden die Patientenakten von 101 Kindern nach Niederspannungsstromunfall retrospektiv ausgewertet. Die Ergebnisse dieser Arbeit wurden in der Diskussio...

  5. Radiological intervention in postoperative complications following liver transplantation; Interventionelle radiologische Verfahren bei postoperativen Komplikationen nach Lebertransplantation

    Energy Technology Data Exchange (ETDEWEB)

    Berger, H. [Inst. fuer Radiologische Diagnostik, Klinikum Grosshadern, Univ. Muenchen (Germany); Staebler, A. [Inst. fuer Radiologische Diagnostik, Klinikum Grosshadern, Univ. Muenchen (Germany); Kunzfeld, A. [Inst. fuer Radiologische Diagnostik, Klinikum Grosshadern, Univ. Muenchen (Germany); Zuelke, C. [Chirurgische Klinik und Poliklinik, Klinikum Grosshadern, Univ. Muenchen (Germany); Anthuber, M. [Chirurgische Klinik und Poliklinik, Klinikum Grosshadern, Univ. Muenchen (Germany); Kraemling, H.J. [Chirurgische Klinik und Poliklinik, Klinikum Grosshadern, Univ. Muenchen (Germany)

    1997-03-01

    Purpose: Postoperative complications contribute significantly to the morbidity and mortality of liver transplant patients. The management of these complications requires a multidisciplinary approach in which interventional radiology plays an integral role. Indications, techniques, and results of radiological interventions in the management of the liver transplant patient are presented. Material and methods: During a 10-year period, 52 out of 420 liver transplant recipients underwent radiological interventions, including angioplasty (n=20), embolization (n=2), percutaneous drainage (n=11), and biliary interventions (n=19). Results: Nine out of ten arterial stenoses located at the anastomoses (n=8), within the liver (n=1) and in the coeliac trunk (n=1) were successfully treated by balloon dilatation. Angioplasty of supra- or infrahepatic anastomotic stenoses of the IVC (n=5) provided long-term success only in combination with stent implantation. Portal vein stenoses and chronic thrombosis were treated by balloon dilatation and stent insertion via transhepatic catheterization of the portal vein. Late strictures of bile-duct anastomoses can be managed by ante- or retrograde interventions. If biliary complications are related to inflammatory or septic problems, the prognosis of graft survival is poor. Conclusion: Interventional radiological procedures are very useful in the management of vascular and biliary complications after liver transplantation. These techniques provide a cure in many situations, and thus, surgical interventions may be avoided in selected cases. (orig.) [Deutsch] Die komplexe chirurgisch-technische Operation sowie immunologische und ischaemieverursachte Probleme tragen zur relativ hohen Komplikationsrate nach Lebertransplantation bei, die grundsaetzlich organ- bzw. lebensbedrohlich fuer den Patienten sind. Interventionelle radiologische Techniken sind aufgrund ihres minimal-invasiven Charakters in der klinischen Versorgung dieser Komplikationen

  6. Long-term results after fibroid embolization; Langzeitergebnisse nach Myomembolisation

    Energy Technology Data Exchange (ETDEWEB)

    Mueller-Huelsbeck, S. [Medizinischer Klinikverbund Flensburg, Akademisches Lehrkrankenhaus des Universitaetsklinikums Schleswig-Holstein, Abt. Diagnostische und interventionelle Radiologie/Neuroradiologie, Ev.-Luth. Diakonissenanstalt zu Flensburg, Flensburg (Germany)

    2008-07-15

    Fibroids (leiomyoma) are the most frequent benign tumors of the uterus during female reproductive age. In the case of clinical symptoms, uterine artery embolization (UAE) is a well established treatment option for symptomatic fibroids, resulting in promising long-term results. In order to estimate long-term success after UAE, reduction of fibroids and uterus volume is less important than complete improvement and disappearance of fibroid-related symptoms. In addition to a high technical success rate and a low perioperative complication rate, UAE results in high short-term and long-term patient satisfaction (>87%) and improvement of symptoms (>81%). Candidates for UAE should be informed about potential reinterventions in terms of repeated UAE (up to 18% of cases) or surgical treatment options. (orig.) [German] Myome sind die haeufigsten gutartigen soliden Tumoren des weiblichen Genitaltrakts im reproduktiven Alter. Bei klinischen Beschwerden stellt die Uterusarterienembolisation (UAE) zur Therapie des symptomatischen Uterus myomatosus einen fest etabliertes Verfahren dar, das mit viel versprechenden Langzeitergebnissen aufwarten kann. Im Vordergrund der Abschaetzung eines lang andauernden Therapieerfolgs nach UAE stehen weniger die Volumenreduktion eines dominanten Myoms bzw. des gesamten Uterus nach der Behandlung, sondern vielmehr die Besserung oder das voellige Verschwinden der von der Patientin initial vor der UAE angegebenen (myombedingten) Beschwerden. Neben einer hohen technischen Erfolgsrate und geringen perioperativen Komplikationsrate fuehrt die fachkundig durchgefuehrte UAE sowohl im Kurz- als auch Langzeitverlauf zu einem hohen Mass an Patientenzufriedenheit (>87%), verbunden mit einer deutlichen Symptombesserung (>81%). Ueber eine Reintervention (in bis zu ca. 18% der Faelle) im Sinne einer erneuten UAE oder einer operativen Massnahme sollten die Patientinnen allerdings im Vorfeld aufgeklaert werden. (orig.)

  7. Cochlear Implants

    Science.gov (United States)

    ... implant procedure Welcome to the Food and Drug Administration (FDA) website on cochlear implants. Cochlear implants are electronic hearing devices. Doctors implant cochlear implants into people ...

  8. Philosophische Begleitung für Suche nach «Gottesteilchen»

    CERN Multimedia

    2007-01-01

    Berlin (AP) Der designierte Generaldirektor des europäischen Zentrums für Teilchenphysik CERN in Genf, Rolf-Dieter Heuer, will die Suche nach dem mysteriösen Higgs-Teilchen philosophisch begleiten lassen.

  9. 2012 Puget Sound LiDAR Consortium (PSLC) Topographic LiDAR: Upper Naches River, Washington

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Watershed Sciences, Inc. (WSI) collected Light Detection and Ranging (LiDAR) data of the Upper Naches River Valley and Nile Slide area of interest on September 30th,...

  10. Metatheoriebildung in der dialogischen Konfliktbearbeitung – ein konzeptioneller Vorschlag am Beispiel der Konflikttransformation nach Galtung und des Konfliktmanagements nach Glasl und des Integralen Ansatzes nach Wilber

    Directory of Open Access Journals (Sweden)

    Karim Fathi

    2010-07-01

    really integrated Peace and Conflict Researcher should be familiar with epistemological and heuristic contexts, but also metatheoretical and theoretical contexts as well. Abstract - Deutsch Angesichts immer komplexerer Konflikte in der Friedens- und Konfliktforschung (Friedens- und Konfliktforschung sind Metatheorien von Nöten, die diese unübersichtliche Vielfalt unterschiedlicher Methoden zu integrieren vermögen. Im Rahmen des vorliegenden Papers soll hierzu ein konzeptioneller Vorschlag skizziert werden, indem zwei holistische und bekannte Ansätze der mediativen Konfliktbearbeitung in einem integrativen Kontext diskutiert werden:- Der Konfliktmanagement-Ansatz nach Prof. Dr. Friedrich Glasl (2004.- Die Transcend-Methode nach Prof. Dr. Johan Galtung (2000. Den theoretischen Rahmen, auf den sich die Überlegungen dieser Arbeit stützen, liefert der Integrale Ansatz (IA von Ken Wilber (2001 – eine viel diskutierte philosophische „Theorie von Allem“, die im Rahmen der Friedens- und Konfliktforschung jedoch noch weitgehend unberücksichtigt geblieben ist. Daher ist es im Rahmen der Arbeit von weiterem Interesse den IA auf seinen Mehrwert für eine integrierte Friedens- und Konfliktforschung zu untersuchen.Die Untersuchung verlief wie folgt: 1. Vorstellung der in der Untersuchung berücksichtigten Ansätze: a. Der Konfliktmanagement-Ansatz von Glasl unterscheidet eine Vielzahl von Kategorien und Ansatzmomenten, die ein komplexes Interventionsspektrum ergeben. Sehr wichtig ist hierbei unter anderem die Berücksichtigung von Eskalationsstufen, die eine Unterscheidung zwischen perzeptions- (niedrige Eskalation, gefühls- (mittlere Eskalation und verhaltensorientierten (hohe Eskalation Maßnahmen ermöglichen. b. Die Konflikttransformation nach Galtung zeichnet sich unter anderem durch dreigeteilte Schematisierungen aus, die ein komplexes Verständnis von Gewalt (direkt, kulturell, strukturell, Konflikt (Verhalten, Annahmen, Widerspruch und Frieden (Gewaltlosigkeit

  11. Cochlear implant

    Science.gov (United States)

    Hearing loss - cochlear implant; Sensorineural - cochlear; Deaf - cochlear; Deafness - cochlear ... of the cochlear implant. WHO USES A COCHLEAR IMPLANT? Cochlear implants allow deaf people to receive and process ...

  12. VERGLEICH VON WINDTURBINEN UNTERSCHIEDLICHER NENNLEISTUNG NACH VERSCHIEDENEN KRITERIEN

    Directory of Open Access Journals (Sweden)

    Aydoğan ÖZDAMAR

    2001-01-01

    Full Text Available In dieser Arbeit wurde die Antwort auf die Frage gesucht, welche Eigenschaften eine Windturbine in den mittelmaßigen und besseren Windstandorten zur Windstromerzeugung haben soll? Zu dem Zweck wurden 10 unterschiedliche in weltweit eingesetzen Windturbinen mit Nennleistung 500 kW und mehr gewählt und nach verschiedenen Beurteilungskriterien verglichen. Für einen allgemeingültigen, einsatzortunabhängigen Vergleich wurden Windmessungen im August 1999 in 10 m Höhe in İzmir, wo das Windenergiepotantial hoch ist, und in Aydın, wo das Windenergiepotantial mittelmäßig ist, durchgeführt. Mit Hilfe dieser Messergebnisse wurde die von den betrachteten Windturbinen zu produzierende Energiemenge berechnet. Danach wurde die zu produzierende Energiemenge der Windturbinen in 10 m und in 70 m Höhe für 1 Jahr ausgerechnet, wobei die jährlichen Messergebnisse von 2 Stationen der staatlichen Behörde für Stromangelegenheiten nahe der Messorten zur Hilfe genommen. Es wurde dabei vorausgesetz, daß die monatlichen Schwankungen des Windenrgiepotantials in Messorten und in Stationen der staatlichen Behörde für Stromangelegenheiten gleich bleibt. Anschließend wurden die Kennwerte wie Energieeinheitskosten, spezifischer Nennleistungspreis, flächen spezifischer Preis, Rückzahlungszeit der Investitionskosten, Kapazitätsfaktor und Turbinkosten pro Jahreskilowattstunde definiert und berechnet. Letzlich wurden die Windturbinen ausgehend von den berechneten Kennwerten untereinander für beide Messorte verglichen und die Ergebnisse interpretiert.

  13. Folgebewertung im vorratsvermögen - Fallstudie zur Vorgehensweise nach IFSR und HGB

    DEFF Research Database (Denmark)

    Quick, Reiner; Warming-Rasmussen, Bent

    2013-01-01

    über die wichstigsten Normen zur Folgebeweriung nach IFSR und HGB sowie zu deren Auslegung. Es schliessen sich ein Fallbeispiel und ein Vorschlag zu dessen Lösung an, in dessen Mittelpunkt sinkende Zeitwerte, die Frage des für die Folgebewerunng relevanten Markts und das Zuschreibungsgebot stehen....

  14. Philosophische Begleitung für Suche nach »Gottesteilchen«

    CERN Multimedia

    2007-01-01

    Berlin_Der designierte Generaldirektor des europäischen Zentrums für Teilchenphysik CERN in Genf, Rolf-Dieter Heuer, will die Suche nach dem mysteriösen Higgs-Teilchen philosophisch begleiten lassen. Der Dialog zwischen Naturwissenschaftlern und Philosophen sei wichtig, sagte der Hamburger Experimentalphysiker am Montag im Deutschlandradio Kultur.

  15. 76 FR 30060 - Proposed Establishment of the Naches Heights Viticultural Area (2009R-107P)

    Science.gov (United States)

    2011-05-24

    ... that of the Naches Heights. Soils After the volcanic flow of andesite cooled and hardened to form the..., geology, soils, physical features, and elevation, that make it distinctive and distinguish it from... soils distinguish the proposed viticultural area from the surrounding areas. Geology The petition states...

  16. Krankengymnastische Frühbehandlung nach Vojta oder nach Bobath: Wie wird die Mutter-Kind-Beziehung beeinflußt?

    OpenAIRE

    Ludewig, Annette; Mähler, Claudia

    1999-01-01

    Die Studie beschäftigt sich mit der Frage nach möglichen Auswirkungen krankengymnastischer Frühbehandlung auf die Mutter-Kind-Beziehung. Mutter-Kind-Paare in Vojta-Behandlung wurden mit solchen in Bobath-Therapie verglichen mit der Erwartung, daß die Vojta-Methode zu stärkerer Belastung der Mutter-Kind-Beziehung beiträgt. Als Indikatoren wurden per Fragebogen die körperliche und seelische Belastung der Mütter sowie ihre Einstellungen zum Kind erhoben. Die Ergebnisse legen nahe, daß insbesonde...

  17. Hypokalzämie nach totaler Thyreoidektomie: Welche Patienten sind gefährdet?

    Directory of Open Access Journals (Sweden)

    Kern B

    2010-01-01

    Full Text Available Die Hypokalzämie bedingt durch eine Dysfunktion der Nebenschilddrüsen ist eine mögliche Komplikation nach totaler Thyreoidektomie. Die Inzidenz des passageren Hypoparathyreoidismus liegt bei 8 %, die des permanenten Hypoparathyreoidismus bei 1,5 %. Ursachen sind hauptsächlich die Devaskularisation oder die akzidentielle Entfernung der Nebenschilddrüse intraoperativ. Üblicherweise erfolgen nach totaler Thyreoidektomie repetitive Kalziumkontrollen, um einer symptomatischen Hypokalzämie vorzubeugen. Durch die intraoperative Parathormonmessung können Patienten mit postoperativem Hypoparathyreoidismus frühzeitig erkannt und behandelt werden. Dadurch sind auch immer kürzere Spitalsaufenthalte möglich. Ein postoperatives intaktes Parathormon unterhalb des Normwerts oder ein intraoperativer Abfall 75 % vom Ausgangswert zeigt zuverlässig gefährdete Patienten an, welche prophylaktisch behandelt werden sollten.

  18. Revaskularisierung und Nachweis von Myofibroblasten im freien Sehnentransplantat nach vorderem Kreuzbandersatz

    OpenAIRE

    Unterhauser, Frank Norman

    2004-01-01

    Um das Langzeitüberleben eines Kreuzbandtransplantates nach Ersatz des VKB zu gewährleisten muß das Transplantat revaskularisiert werden. Trotz zahlreicher Studien zu diesem Thema gibt es noch immer eine kontroverse Diskussion bezüglich der Revaskularisierung von Kreuzbandtransplantaten. Ziel der vorliegenden Studie war es die endoligamentäre mikrokapilläre Revaskularisierung eines freien Sehnentransplantates mit Hilfe immunhistochemischer Färbetechnik darzustellen und ihren Verlauf über die ...

  19. Untersuchung zur Eignung eines Gewebeklebers zum Verschluss der Hautwunde bei weiblichen Katzen und Kaninchen nach Kastrationen

    OpenAIRE

    Harre, Daniela

    2012-01-01

    Die Kastration von weiblichen Katzen und Kaninchen ist ein häufig durchgeführter operativer Eingriff in Kleintierpraxen mit einer relativ hohen Inzidenz an möglichen postoperativen Wundheilungskomplikationen. Einen möglichen Einfluss auf die Komplikationsrate hat die Wahl der Methode des Hautwundverschlusses. Ziel dieser Arbeit war es daher, den Wundheilungsverlauf nach Durchführung der Kastration und anschließendem Hautverschluss durch Naht- und Klebetechnik bei zwei unterschiedlichen Tie...

  20. Rückwanderer und Weiterwanderer : ein Aspekt der südkoreanischen Arbeitsmigration nach Deutschland

    OpenAIRE

    Bartmann, Sylke; Garz, Detlef; Lee, Hyo-Seon

    2012-01-01

    "Der Beitrag thematisiert Fragestellungen und Ergebnisse, die in einem internationalen Forschungsprojekt entstanden sind, in dem koreanische und deutsche WissenschaftlerInnen gemeinsam zur südkoreanischen Migration arbeiten. Diskutiert werden zwei mögliche Wege der Migration - die Rück- und Weiterwanderer - als spezifische Formen von Migrationsverläufen. Die Thematisierung wird sowohl mit Blick auf die Migrationsforschung als auch auf die Biographieforschung vollzogen und es wird nach dem Ver...

  1. Imaging of postarthroscopic complications after knee injuries; Bildgebung postarthroskopischer Komplikationen nach Knieverletzungen

    Energy Technology Data Exchange (ETDEWEB)

    Schueller-Weidekamm, C. [Medizinische Universitaet Wien, Abteilung fuer Neuroradiologie und muskuloskelettale Radiologie, Klinik fuer Radiodiagnostik, Wien (Austria); Skrbensky, G. von [Medizinische Universitaet Wien, Klinik fuer Orthopaedie, Wien (Austria)

    2012-11-15

    The most common joint injuries in professional and recreational sports participants and also in the total population are knee injuries. Arthroscopy is indicated if this modality will improve the patient outcome and potential long-term complications can be avoided. Although uncommon, complications following arthroscopy are mostly evaluated by magnetic resonance imaging (MRI). For planning further therapy strategies following postarthroscopic complications, e.g. if anterior cruciate ligament (ACL) reconstruction is required, digital radiographs and computed tomography (CT) are helpful. This article provides an overview of the different procedures for surgical treatment which are a prerequisite for the analysis of postarthroscopic images. In addition typical complications after treatment of meniscal and chondral injuries as well as after ACL reconstruction are described and typical signs in MRI, radiography and CT are explained in detail. (orig.) [German] Kniegelenkverletzungen sind nicht nur bei Profisportlern, sondern auch in der Gesamtbevoelkerung die haeufigsten Gelenkverletzungen. Die Indikation zur arthroskopischen Operation wird gestellt, wenn im Vergleich zur konservativen Therapie ein besseres Ergebnis postarthroskopisch zu erwarten ist und potenzielle Spaetkomplikationen verhindert werden koennten. Die selten aber dennoch auftretenden postarthroskopischen Komplikationen werden zumeist mit der Magnetresonanztomographie (MRT) abgeklaert. Zur weiteren Therapieplanung nach Komplikationen, z. B. wenn eine Kreuzbandrevision notwendig ist, sind die digitale Projektionsradiographie und die Computertomographie (CT) hilfreich. Dieser Artikel bietet eine kurze Uebersicht ueber die unterschiedlichen Operationstechniken, die eine Voraussetzung fuer das Verstaendnis der bildgebenden postoperativen Veraenderungen sind. Weiter wird auf die haeufigsten Komplikationen nach Meniskus- und Knorpeloperationen sowie nach vorderer Kreuzbandrekonstruktion und den damit

  2. Die Nachfrage nach Biolebensmitteln in Deutschland : Ökonometrische Analysen zu Nachfragestruktur, Preisbildung und Produktkennzeichnung

    OpenAIRE

    Schröck, Rebecca

    2014-01-01

    Der Biomarkt ist mit einem Umsatzanteil von rund vier Prozent bislang noch ein kleines Segment im deutschen Lebensmittelmarkt – allerdings eines mit großem Nachfrage- und Wachstumspotential. Um das Angebot an den Kundenbedürfnissen ausrichten und das Wachstumspotential ausschöpfen zu können, ist es für alle Akteure auf dem Biomarkt wichtig, die Determinanten der Nachfrage nach Biolebensmitteln zu kennen und das Verhalten der Biokäufer einschätzen zu können. Doch in der wissenschaftlichen Lite...

  3. Einschätzung des PSA-Rezidivs nach kurativer Therapie des Prostatakarzinoms

    Directory of Open Access Journals (Sweden)

    Weißbach L

    2004-01-01

    Full Text Available Das in die Nachsorge kurativ behandelter Patienten mit Prostatakarzinom aufgenommene PSA-Monitoring schafft einen neuen klinischen Status. Wir haben es jetzt mit einem "bio-chemisch Kranken" zu tun, bei dem nicht selten kein lokales Rezidivgeschehen und schon gar nicht eine Fernmetastasierung nachgewiesen werden kann. Um zwischen der lokalen und systemischen Erkrankung unterscheiden zu können, hat man sich früher der "pathohistologischen Prädiktion" bedient. Hierauf beruht auch ein großer Teil der häufig eingesetzten Nomogramme. Mit der Bestimmung der PSA-DT ist eine Methode in das diagnostische Repertoire aufgenommen worden, die nach weiterer Evaluierung dazu dienen könnte, lokale Maßnahmen (RT nach RP oder Salvage-Prostatektomie, HIFU bzw. Kryotherapie oder eine Androgendeprivation vorzunehmen. Vieles deutet darauf hin, daß wir in Zukunft nicht nur mit einer Berechnung der PSA-DT die lokale von der systemischen Progression unterscheiden können, sondern auch das Übergangsstadium zur klinischen Metastasenerkrankung voraussagen und das Risiko, am Prostatakrebs zu sterben, einschätzen können.

  4. Implantable contraception.

    Science.gov (United States)

    Meckstroth, K R; Darney, P D

    2000-12-01

    Although levonorgestrel contraceptive implants have been available for over 15 years, innovations have only recently led to a wider choice. These new implants offer easier insertion and removal and other advantages depending on the type of progestin. Implants prevent pregnancy by several mechanisms, including inhibition of ovulation and luteal function and alteration of cervical mucus and the endometrium. The high efficacy and ease of maintenance make implants an ideal contraceptive for many women, including adolescents, a population that uses implants infrequently but reports high satisfaction. Implants are appropriate for women who are breastfeeding, who have contraindications to estrogen, or who have diseases such as diabetes, hypertension, sickle cell anemia, or an HIV infection because implants have few metabolic or hematologic effects. Long-term use has not been associated with a decrease in BMD and generally leads to increased blood levels and iron stores. Women who wish to space their pregnancies appreciate the nearly immediate onset of action with insertion and the rapid termination of all effects with removal. All types of implants lead to menstrual changes and other side effects in some women. Adverse effects that occur in implant users more than the general population include headaches and acne. Women must be thoroughly counseled regarding the potential for menstrual alteration, side effects, and sexually transmitted infections if they do not use condoms. Despite their initial high cost, implants are a cost-effective method over several years, even when discontinued before the life of the implant.

  5. Dental Implant Surgery

    Science.gov (United States)

    ... to find out more. Dental Implant Surgery Dental Implant Surgery Dental implant surgery is, of course, surgery, and is ... to find out more. Dental Implant Surgery Dental Implant Surgery Dental implant surgery is, of course, surgery, and is ...

  6. Radiation exposure by patients after radionuclide diagnostics or therapy; Strahlenexposition durch Patienten nach nuklearmedizinischer Untersuchung und Therapie

    Energy Technology Data Exchange (ETDEWEB)

    Bockisch, A.; Sonnenschein, W. [Essen Univ. (Gesamthochschule) (Germany). Klinik und Poliklinik fuer Nuklearmedizin

    2000-07-01

    The quantitative estimation of the radiation exposure of the population by patients after diagnostic or therapeutic radionuclide application is presented. The paper is based on various published measurements and the recommendation of the German Radiation Savety Committee. The violation of legal limits can only be constructed for physicians performing a high number of sonograms immediately after radionuclide application for bone scans (physician/patient contact time >20 h/a). Otherwise, e.g. if these sonograms are performed after the bone scan, a limit violation may hardly occur. This statement holds for any nuclear medicine procedure particularly also for the child of an investigated mother or vice versa and for nurses. The 1 mSv restriction, on the other hand, can only be met by hospitalisation in the case of radioiodine therapy. (orig.) [German] Die quantitative Abschaetzung der Strahlenexposition der Bevoelkerung durch Patienten nach diagnostischen oder therapeutischen nuklearmedizinischen Massnahmen wird vorgestellt. Der Artikel stuetzt sich dabei auf verschiedene Messungen, die in der Literatur beschrieben sind, sowie auf Empfehlungen der Strahlenschutzkommission, denen Rechnungen und Messungen zugrunde liegen. Demnach lassen sich Grenzwertueberschreitungen, verursacht durch Patienten nach nuklearmedizinischer Diagnostik, lediglich fuer den Fall konstruieren, dass ein Arzt abdominelle Sonographien bei einer hohen Zahl von Patienten (>20 h Kontaktzeit mit den Patienten/Jahr) unmittelbar nach Tracer-Applikation fuer die Skelettszintigraphie durchfuehrt. Ansonsten, beispielsweise auch wenn die Sonographien nach der Szintigraphie erfolgen, ist ein Erreichen der 1 mSv-Grenze kaum moeglich. Dies gilt fuer jegliche Untersuchungsart insbesondere auch fuer das Kind einer untersuchten Mutter oder umgekehrt oder fuer das Pflegepersonal. Die Einhaltung der 1 mSv-Grenze nach Radioiodtherapie ist dagegen nur bei stationaerer Therapie moeglich. (orig.)

  7. Implant contraception.

    Science.gov (United States)

    Meckstroth, K R; Darney, P D

    2001-12-01

    The experience of 6 million Norplant users has led to several more advanced implants. Implanon is a single-rod implant system containing a low androgenic progestin and requires 1 to 2 minutes for insertion and removal. Like other implants, Implanon prevents pregnancy by changing the character of the cervical mucus and interfering with luteal function. Unlike Norplant, though, Implanon is designed to prevent ovulation for the full duration of use. Implant contraception has several advantages over other types of contraception including high efficacy, minimal required maintenance, absence of estrogen, and rapid return of fertility after discontinuation. Implants can be a good choice for adolescents; women with hypertension, diabetes, anemia, endometriosis, or other medical problems; and women who are breast-feeding. Irregular bleeding is the most common adverse effect of implants and can be treated with several medication regimens. Preinsertion counseling, however, is the most important factor in ensuring satisfaction with implants. Unfortunately, no implant system is currently available in the United States since August 2000, but Implanon is expected to reach the U.S. market within the next 2 years.

  8. Pelvic insufficiency fractures after radiotherapy of gynecologic tumors; Osteoradionekrose nach Strahlentherapie gynaekologischer Tumoren

    Energy Technology Data Exchange (ETDEWEB)

    Hoeller, U.; Hoecht, S.; Hinkelbein, W. [Freie Univ. Berlin (Germany). Universitaetsklinikum Benjamin Franklin, Abt. fuer Strahlentherapie; Wudel, E. [Freie Univ. Berlin (Germany). Universitaetsklinikum Benjamin Franklin, Abt. fuer Radiologie und Nuklearmedizin

    2001-06-01

    13 Patientinnen zusaetzlich eine Osteodensitometrie. Die Patientinnen waren adjuvant (n=29) bzw. primaer (n=18) ueber opponierende Felder mit 18-MeV-Photonen mit 46 Gy und Brachytherapie (15-39 Gy) bestrahlt worden. Die mediane Nachbeobachtungszeit betrug 36 Monate. Ergebnisse: Bei sieben Patientinnen trat eine Osteoradionekrose median 11 Monate nach Therapie (minimal 2 Monate) auf. Bei allen Patientinnen traten maessige bis starke Schmerzen im Beckenring auf, die bei fuenf Patientinnen ohne spezifische Therapie nach 5-28 Monaten ganz/teilweise reversibel waren. Bei Erstuntersuchung zeigten sich mit einer Ausnahme szintigraphisch starke Anreicherungen im Ileosakralgelenk und/oder Os sacrum, die mit Infraktionen (CT) korrelierten. Bei den 40 zeitgleich behandelten Patientinnen traten keine Schmerzen, keine intensiven, aber vier maessiggradige szintigraphische Mehranreicherungen (CT unauffaellig) im Feld auf. Drei von vier untersuchten Patientinnen mit Osteoradionekrosen hatte eine Osteoporose im Vergleich zu sieben von neun untersuchten Patientinnen ohne Osteoradionekrosen. Schlussfolgerung: Im Beckenbereich koennen lumbosakraler Schmerz und Sklerose/Fraktur auf eine Osteoradionekrose hinweisen, die schon im ersten Jahr nach Therapie manifest werden kann und von einer ossaeren Metastasierung differenziert werden sollte. (orig.)

  9. Focal neuropathies following percutaneous nephrolithotomy (PCNL – preliminary study [Fokale Neuropathien nach perkutaner Nephrolithotomie (PCNL

    Directory of Open Access Journals (Sweden)

    Kalantari, Behnam Behmardi

    2013-06-01

    Full Text Available [english] Introduction: Postoperative neurological complications in pelvic and renal surgery are a well-known clinical problem and their morbidities are important. We designed this study to determine prevalence and risk factors of such complications after percutaneous nephrolithotomy (PCNL surgery.Material and methods: A cross-sectional study was performed during February and July 2011 on 68 PCNL cases. Demographic data and surgery reports were gathered and comprehensive neurological physical examination carried out before and after surgery. Then, data was analyzed using software SPSS 18. Results: The ultimate sample included 30 (46.2% male and 35 (53.8% female patients with a mean age of 47.9 ± 11.47 years. In intercostal and lumbosacral plexus area, sensory neurological complications occurred in 8 patients (12.31%, 4 men and 4 women. The most common involved dermatomes and nerves were T12 (8 cases. There was a significant correlation between prolonged duration of surgery and prevalence of sensory complications (p[german] Einleitung: Postoperative neurologische Komplikationen bei operativem Eingriff an Becken und Niere sind ein bekanntes klinisches Problem und deren Krankheitsverläufe sind wichtig. Wir planten diese Studie, um die Prävalenz und die Risikofaktoren derartiger Komplikationen nach perkutaner Nephrolithotomie (PCNL zu erfassen.Material und Methoden: Von Februar bis Juli 2011 wurde eine Querschnittstudie an 68 PCNL-Fällen durchgeführt. Die demographischen Daten und die Operationsberichte wurden ausgewertet und umfassende neurologische und körperliche Untersuchungen wurden vor und nach dem chirurgischen Eingriff vorgenommen. Die Daten wurden mit der Software SPSS 18 analysiert.Ergebnisse: In die Studie einbezogen wurden 30 männliche (46,2% und 35 (53,8% weibliche Patienten mit einem mittleren Alter von 47,9 ± 11,47 Jahren. Bei 8 Patienten (12,31%, bei 4 Männern und 4 Frauen, wurden im Bereich des interkostalen und

  10. Das Répertoire International des Sources Musicales (RISM nach Fünfzig Jahren

    Directory of Open Access Journals (Sweden)

    Heckmann, Harald

    2001-12-01

    Full Text Available In 1952, a Commission Mixte formed by members of the International Musicological Society (IMS and the International Association of Music Libraries (lAML constituted in Paris the Répertoire International des Sources Musicales (RISM. In 1971, the first two volumes appeared - the Écrits imprimés concernant la musique edited by François Lesure. In 1960, a central editorial office (Zentralredaktion was founded in Kassel for the Series of the Einzeldrucke vor 1800/Single Prints before 1800. Consisting of 13 volumes, this is now complete with the exception of an index. Since moving to Frankfurt am Main in 1987, the Zentralredaktion has concentrated its work on the Handschriften nach 1600/Manuscripts after 1600. Because of its scope, this project presented RISM with an enormous challenge and, therefore, digitalization was a very early priority. In 1995, the first CD-ROM with the RISM manuscript database appeared followed each year by a cumulative edition; the sixth CD appeared at the end of 2000 containing about 350,000 entries from 575 libraries in 31 countries. Looking at what has been achieved in the last 50 years and taking into account the Series of special catalogs, now expanded to 29 printed volumes, the result deserves respect. There are, however, gaps. These include the fact that in some countries with an especially rich tradition, sources not yet accessible will have to be integrated into the RISM catalog. Spain is such a country and F. Gonzalez Valle has rendered great service in making these sources accessible. His pupils and successors are called upon to mobilize all forces so that within the international RISM community Spain takes up the place appropriate to its past and present rich musical culture.[de] 1952 konstituierte eine Commission Mixte aus Mitgliedern der Internationalen Gesellschaft fur Musikwissenschaft (IGMW und der Internationalen Vereinigung der Musikbibliotheken (IVMB in Paris das Répertoire International des Sources

  11. About Implantable Contraception

    Science.gov (United States)

    ... Helping Your Child Deal With Death About Implantable Contraception KidsHealth > For Parents > About Implantable Contraception Print A ... How Much Does It Cost? What Is Implantable Contraception? Implantable contraception (often called the birth control implant) ...

  12. Abscesses after appendectomy due to intraoperative loss of fecaliths; Abszesse nach Appendektomie durch intraoperativ verlorene Appendicolithen

    Energy Technology Data Exchange (ETDEWEB)

    Hoermann, M.; Kreuzer, S. [Universitaetsklinik fuer Radiodiagnostik, Vienna (Austria). Abt. chirurgische Faecher; Sacher, P. [UniversitaetsSpital Zuerich (Switzerland). Abt. Kinderchirurgie; Eich, G.F. [UniversitaetsSpital Zuerich (Switzerland). Inst. fuer Diagnostische Radiologie

    2001-08-01

    Objective: Fecaliths appear to predispose a patient to acute appendicitis, abscess formation, and perforation. The number of preoperative radiological evaluations is increasing, although children with suspected perforation still undergo surgery immediately. We report and discuss imaging findings and implications in children with acute appendicitis and fecalithis. Methods: Four children (3 girls, 1 boy; mean age 9 years) underwent surgery for acute appendicitis. Three children underwent sonography and plain radiography before surgery, 1 child was operated without radiological evaluation. After readmission, all 4 children underwent sonography and plain radiography before surgery. Results: In 3 patients a fecalith was diagnosed initially. After uneventful recovery all 4 patients had acute abdominal pain and readmission was necessary. In all 4 patients the escaped fecalith was demonstrated with sonography and plain radiography confirmed surgically. Conclusion: Discussion about the role of imaging in acute appendicitis has concentrated on the diagnostic yield of cross-section techniques. The importance of demonstrating a fecalith, prompting a more thorough intraoperative search has found little attention. The radiologist should also detect and localize a fecalith and should be aware of retained fecaliths as a cause of abscess formation after appendectomy. (orig.) [German] Ziel: Faekolithen praedisponieren Kinder zu akuter Appendizitis und fuehren vermehrt zu Perforation und Abszessen. Wir berichten und diskutieren die Bedeutung der Bildgebung bei Kindern mit Faekolithen und perforierter akuter Appendizitis. Methoden: 4 Kinder (drei Maedchen, ein Junge, Altersmeridian 9 Jahre) wurden wegen perforierter akuter Appendizitis operiert. Drei Kinder erhielten praeoperativ eine Ultraschalluntersuchung und ein Abdomen-Uebersichtsbild. Nach Neuaufnahme wurden nun bei allen Kindern eine Ultraschalluntersuchung und ein Abdomen-Uebersichtsbild angefertigt und neuerlich operiert

  13. Medienkompetenz oder Medienbildung? Zur Frage nach dem Zielwert medienpädagogischer Praxis

    Directory of Open Access Journals (Sweden)

    Marius Thomann

    2015-02-01

    Full Text Available In einer Serie von vier Artikeln (Schorb 2009; Spanhel 2010; Tulodziecki 2010; Fromme u. Jörissen 2010 wurde 2009 und 2010 in der Zeitschrift merz: Medien + Erziehung die Frage nach dem Leitbegriff der Medienpädagogik diskutiert. In den vorliegenden Ausführungen wird im Bezugsrahmen dieser Debatte die Frage diskutiert, ob Medienkompetenz oder Medienbildung der Zielwert medienpädagogischer Praxis sein sollte. Dabei wird in einer argumentationstheoretischen Analyse zunächst jeweils ein deskriptives und ein normatives Argument gegen Medienkompetenz rekonstruiert und zurückgewiesen. Als Grundlage dieser Argumente zeigt sich hierbei eine begriffliche Verwechslung zwischen den theoretischen Modellen zur Medienkompetenz und der Verwendung dieses Konzepts im pädagogisch verkürzten Sinne einzelner Unterkompetenzen. Anschliessend werden drei Adäquatheitskriterien für Zielwerte medienpädagogischer Praxis vorgeschlagen, die dann als Grundlage für die Bewertung beider Alternativen im begrifflichen Bezugsrahmen der genannten Debatte dienen. Im Ergebnis empfiehlt sich Medien­kompetenz als dieser Zielwert, während das Konzept der Medienbildung begrifflicher Schärfung und einer Ausarbeitung seiner Schnittstelle zur medienpädagogischen Praxis bedarf.

  14. Modern information technology for load management and control systems; Leittechnik-Informationssysteme nach heutigem Standard

    Energy Technology Data Exchange (ETDEWEB)

    Czarnach, R. [EWAG Energie- und Wasserversorgung AG, Nuernberg (Germany); Kienzle, W. [Alcatel SEL, Stuttgart (Germany); Noack, H.E. [Siemens AG, Karlsruhe (Germany)

    1997-03-01

    The Technical Committee 5.5 - Process Data Transmission - of the Informationstechnische Gesellschaft ITG presents two of his many fields of work, i.e. applications on platforms and modern load management and control systems. These two subjects comprise not only technical aspects but also organisational, economic and sociological problems. In the opinion of the Technical Committee, these factors should get more attention in the future. The contribution intends to stimulate discussion of this point. (orig.) [Deutsch] Dem Fachausschuss 5.5 - Prozessdatenuebermittlung - der Informationstechnischen Gesellschaft ITG ist es ein Anliegen, den Begriff Prozessdatenuebermittlung sowie seine Herkunft und die Aufgabenstellung des Fachausschusses zu beschreiben. Aus seinem breiten Arbeitsbereich heraus werden die zwei Themenfelder Applikationen auf Plattformen und moderne Leittechniksysteme erlaeutert. Diese beiden Themen wurden ausgewaehlt, weil sie neben ihren technischen Aspekten auch damit zusammenhaengende organisatorische, wirtschaftliche und soziologische Fragen betrachten. Der Fachausschuss ist der Meinung, dass solche Fragestellungen oder die Suche nach Antworten, die sich mit dem bei der technischen Weiterentwicklung aendernden Wechselspiel zwischen Hersteller, Hochschulen und Anwender beleuchtet, zukuenftig einen deutlich hoeheren Stellenwert haben muss als bisher. Der Beitrag soll zur Diskussion anregen. (orig.)

  15. Imaging before and after uterine artery embolization; Bildgebende Diagnostik vor und nach Uterusmyomembolisation

    Energy Technology Data Exchange (ETDEWEB)

    Kroencke, T.J. [Charite - Universitaetsmedizin Berlin, Radiologische Klinik, Campus Virchow-Klinikum, Berlin (Germany)

    2008-07-15

    Percutaneous catheter-based embolization treatment of symptomatic uterine fibroids has evolved into the most widely used alternative therapeutic approach to surgical treatment worldwide. Uterine artery embolization (UAE) induces infarction of leiomyomas, resulting in ischemic necrosis, hyaline degeneration, and size reduction with resolution of associated symptoms. Published experience suggests that UAE is an effective and reliable option for treating uterine fibroids with high patient satisfaction. Magnetic resonance imaging (MRI) is superior to ultrasonography for determining the site, size and number of fibroids, which is important for establishing the indication for UAE. Other potential advantages of MRI include the option of performing MR angiography (MRA) and obtaining contrast-enhanced images for monitoring the outcome of UAE and assessing possible complications after UAE. (orig.) [German] Die perkutane kathetergestuetzte Uterusmyomembolisation ist inzwischen weltweit die am meisten verbreitete Alternative zur operativen Behandlung des symptomatischen Uterus myomatosus. Der durch Embolisation der Aa. uterinae (Syn. Uterusarterienembolisation, UAE) bewirkte 'Myominfarkt' fuehrt zu ischaemischer Nekrose, hyalinem Umbau und Groessenreduktion der Myome unter Rueckbildung myomassoziierter Beschwerden. Die bisher publizierten Erfahrungen zeigen, dass es sich bei der Embolisation um eine effektive und sichere Methode mit hoher Patientinnenzufriedenheit handelt. Die Magnetresonanztomographie (MRT) ist dem Ultraschall in der fuer die Indikationsstellung wichtigen Beurteilung von Lage, Groesse und Zahl der Myomknoten ueberlegen. Weitere moegliche Vorteile ergeben sich durch den Einsatz der MR-Angiographie (MRA) sowie kontrastmittelunterstuetzter Aufnahmen zur Erfolgskontrolle und Abklaerung von Komplikationen nach Embolisation. (orig.)

  16. Penile Implants

    Science.gov (United States)

    ... men with erectile dysfunction (ED) to get an erection. Penile implants are typically recommended after other treatments for ... the scrotum, and two inflatable cylinders inside the penis. To achieve an erection, you pump the fluid from the reservoir into ...

  17. Cochlear Implants

    Science.gov (United States)

    ... the skin. An implant does not restore normal hearing. It can help a person understand speech. Children and adults can benefit from them. National Institute on Deafness and Other Communication Disorders

  18. Cochlear implant by adult

    OpenAIRE

    Kratochvílová, Tereza

    2011-01-01

    Bachelor thesis "The cochlear implant in an adult deaf" deals primarily with the cochlear implant. The most extensive part of the thesis talks about this topic, which also talks about the development and design of cochlear implants, explains the difference between cochlear implantation and tribal implantation and describes operation of implant and the subsequent setting of the implant. This section is also dedicated to binaural cochlear implantation, myths of cochlear implants and problems wh...

  19. Häufigkeit und Muster der Tumorerkennung nach Selbstuntersuchung bei Mittel- bis Hochrisiko-Melanompatienten.

    Science.gov (United States)

    Sindrilaru, Anca; Neckermann, Vera; Eigentler, Thomas; Kampilafkos, Panagiotis; Crisan, Diana; Treiber, Nicolai; Scharffetter-Kochanek, Karin; Schneider, Lars Alexander

    2017-01-01

    Die Frage, wie oft Melanompatienten mit Mittel- bis Hochrisikomelanomen den Tumor bemerken und welche Eigenerkennungsmuster existieren ist bislang nicht beantwortet. Wir haben eine retrospektive Studie an Melanompatienten durchgeführt, die sich zwischen 2004 und 2008 einer Sentinellymphknotenbiopsie unterzogen haben,. Der Fragebogen wurde von 127 der insgesamt 133 Patienten ausgefüllt. 25 % bemerkten den Tumor überhaupt nicht. Die restlichen 75 % zeigten verschiedene Eigenerkennungsmuster: 25 % holten nach 0-12 Wochen Rat ein, weitere 25 % innerhalb von 3-6 Monaten, und bei den restlichen 25 % wurde der Tumor mehr als sechs Monate lang beobachtet, bevor er entfernt wurde. Alter, Geschlecht und Lokalisation des Melanoms waren bei allen Eigenerkennungsgruppen vergleichbar. Die häufigsten Subtypen waren: SSM (59), NMM (31), ALM (9), UCM (9) und LMM (4). Seltene Subtypen (15) waren ebenfalls vorhanden. Patienten mit 3-6 Monate alten Läsionen zeigten die höchste durchschnittliche Tumordicke und die bei weitem höchste Anzahl von pT4-Tumoren. 60 % der Patienten mit NMM hatten eine Krankengeschichte von Melanome wurden in nur 50 % der Fälle selbstständig erkannt. Selbst fortgeschrittene Melanome blieben von den Patienten in 25 %, seltene Melanom-Subtypen in 50 % der Fälle unerkannt. Daher sollte der Eigenerkennungshäufigkeit, dem erhöhten Bewusstsein für seltene Melanome und der schnellen Überweisung an einen Spezialisten in zukünftigen Aufklärungskampagnen besondere Aufmerksamkeit zukommen. © 2017 Deutsche Dermatologische Gesellschaft (DDG). Published by John Wiley & Sons Ltd.

  20. Welche Nahrungsergänzungsmittel braucht die Frau nach der Menopause?

    Directory of Open Access Journals (Sweden)

    Zyriax BC

    2012-01-01

    Full Text Available Nahrungsergänzungsmittel wie Vitamine, Mineralien, Omega-3-Fettsäuren und einige weitere Substanzen finden in den westlichen Ländern weite Verbreitung. In Deutschland nehmen 40 % der Frauen 50 Jahre regelmäßig Supplemente in der Absicht ein, eine adäquate Versorgung zu gewährleisten oder chronische Krankheiten zu vermeiden. Die Mehrheit der Verbraucher berät sich nicht mit ihrem Arzt, was zu inadäquater Dosierung, potenziellen Nebenwirkungen und Interaktionen mit Medikamenten führen kann. Im Unterschied zu Medikamenten dürfen Supplemente ohne Nachweis ihrer Wirksamkeit durch klinische Studien vertrieben werden. Bisher ist die Evidenz für die meisten Supplemente unzureichend, um ihre Anwendung zur Prävention von Krebs oder Herz-Kreislauferkrankungen zu empfehlen. Die Daten von Beobachtungsstudien sind widersprüchlich und Informationen aus randomisierten, kontrollierten Studien fehlen. Daher ist der allgemeine Gebrauch von Supplementen im täglichen Leben eine Gratwanderung zwischen Nutzen und Risiko. Hinsichtlich einer Osteoporose-Prophylaxe werden regelmäßige körperliche Aktivität und eine ausreichende Versorgung mit Kalzium aus der Nahrung und gegebenenfalls eine Supplementierung von Vitamin D empfohlen, insbesondere für Frauen nach der Menopause. Weiterhin ist unter älteren Frauen ein Mangel an Vitamin B12 aufgrund ungenügender Versorgung oder atrophischer Gastritis verbreitet. Mehr Information ist zur Einschätzung des Stellenwertes von Omega-3-Fettsäuren und B-Vitaminen zum Erhalt kognitiver Funktionen erforderlich.

  1. Multiparametric prostate MRI for follow-up monitoring after radiation therapy; Multiparametrische MRT der Prostata zum Therapiemonitoring nach Strahlentherapie

    Energy Technology Data Exchange (ETDEWEB)

    Weidner, A.M.; Dinter, D.J.; Bohrer, M.; Sertdemir, M.; Hausmann, D.; Wenz, F.; Schoenberg, S.O. [Universitaetsmedizin Mannheim, Medizinische Fakultaet Mannheim der Universitaet Heidelberg, Institut fuer Klinische Radiologie und Nuklearmedizin, Mannheim (Germany)

    2012-03-15

    Radiation therapy is a therapeutic option with curative intent for patients with prostate cancer. Monitoring of prostate-specific antigen (PSA) values is the current standard of care in the follow-up. Imaging is recommended only for symptomatic patients and/or for further therapeutic options. For detection of local recurrence magnetic resonance imaging (MRI) of the prostate is acknowledged as the method of choice. Good results for primary diagnosis were found especially in combination with functional techniques, whereas in recurrent prostate cancer only few studies with heterogeneous study design are available for prostate MRI. Furthermore, changes in different MRI modalities due to radiation therapy have been insufficiently investigated to date. As the initial results were promising prostate MRI and available therapeutic options for detection of local recurrence should be considered in patients with increased PSA. (orig.) [German] Fuer Patienten mit Prostatakarzinom stellt die Radiatio eine potenziell kurative lokale Therapieoption dar. Im Rahmen der Nachsorge nach lokal kurativ intendierter Therapie wird aktuell der Verlauf des PSA-Werts (PSA prostataspezifisches Antigen) kontrolliert, der Einsatz bildgebender Verfahren wird lediglich bei symptomatischen Patienten und/oder zur Planung einer Salvagetherapie empfohlen. Die MRT der Prostata stellt derzeit die Methode der Wahl zur lokalen Rezidivdiagnostik dar. Insbesondere in Verbindung mit funktionellen Untersuchungstechniken zeigen Studien gute Ergebnisse in der Primaerdiagnostik. Zum Einsatz der MRT der Prostata in der Rezidivsituation wurden bisher nur wenige Studien mit heterogenem Studiendesign publiziert. Auch die in der MRT nach Bestrahlung sichtbaren Veraenderungen in den unterschiedlichen Modalitaeten sind noch wenig evaluiert. Da die ersten Studienergebnisse auch bei Patienten nach Radiatio viel versprechend sind, sollte bei unklarem PSA-Anstieg und vorhandener Therapieoption eine MRT der Prostata zur

  2. Kosovo - Sonderfall mit Präzedenzwirkung? Völkerrechtliche und politische Entwicklungen nach dem Gutachten des Internationalen Gerichtshofs

    OpenAIRE

    Halbach, Uwe; Richter, Solveig; Schaller, Christian

    2011-01-01

    "Im Juli 2010 bescheinigte der Internationale Gerichtshof in einem Gutachten, dass die Unabhängigkeitserklärung des Kosovo von 2008 das Völkerrecht nicht verletzt habe. Von Deutschland war der Kosovo bereits wenige Tage nach Deklaration seiner Unabhängigkeit als Staat anerkannt worden. Heute engagiert sich die Bundesrepublik dort für den Aufbau staatlicher Institutionen und bei der Förderung von Demokratie und Rechtsstaatlichkeit. Zwar haben die Bundesregierung und andere Befürworter der koso...

  3. Regierung der Teuerung nach 1848. Lebensmittelpreise und Proteste als politische und administrative Probleme in Bayern und Preußen

    OpenAIRE

    Engelns, Martina

    2016-01-01

    Die 1840er Jahre in Bayern und Preußen waren geprägt von Hungerunruhen, food riots und Bierkrawalle sowie die sich daran anschließenden Revolutionen. Was geschah, als nach einer kurzen Ruhephase die Lebensmittelpreise wieder stiegen und sich zwischen 1851 und 1856 auf ähnlich hohem Niveau wie 1846/7 hielten? Nun, dieses Mal protestierte fast niemand. Was hatte sich verändert? Ein wesentlicher Unterschied wird in diesem Buch in den Blick genommen: Ganz anders als im Vormärz reagierten die Behö...

  4. Spätnebenwirkungen nach Radiotherapie Strategien zur Vermeidung respektive Symptomlinderung bei Brust- und gynäkologischen Tumoren

    OpenAIRE

    Linsenmeier, C.

    2012-01-01

    Nach brusterhaltender Chirurgie ist die Radiotherapie indiziert, welche evidenzbasiert das Risiko für ein Lokalrezidiv senkt und das Gesamtüberleben verbessert. Auch bei gynäkologischen Tumoren ist die Radiotherapie zur besseren Tumorkontrolle angezeigt. Um Nutzen und Risiko für die Patientin abwägen zu können, sind Kenntnisse der Spätnebenwirkungen einer Strahlentherapie unerlässlich. Diese Effekte sollten auch dem gynäkologischen Grundversorger in der Krebsnachsorge bekannt sein.

  5. A review of endocrine late effects in children after brain tumor therapy; Endokrinologische Funktionsstoerungen nach Hirntumortherapie im Kindesalter

    Energy Technology Data Exchange (ETDEWEB)

    Marx, M.; Langer, T.; Beck, J.D.; Doerr, H.G. [Erlangen-Nuernberg Univ., Erlangen (Germany). Kinderklinik mit Poliklinik

    1999-07-01

    : In der Regel kommt es als erstes und am haeufigsten zu Stoerungen der Wachstumshormonsekretion. Stoerungen der spontanen Wachstumshormonsektretion wurden bereits nach konventionell fraktionierter Schaedelbestrahlung mit 18 Gy beobachtet. Mit einiger Latenz koennen auch Stoerungen der anderen hypothalamo-hypophysaeren Achsen bis hin zum Panhypopituitarismus auftreten. Die Pubertaet kann verfrueht oder verspaetet beginnen oder ganz ausbleiben. Insbesondere bei Maedchen kommt es nach Hirntumortherapie gehaeuft zur fruehen und im Ablauf beschleunigten Pubertaetsentwicklung, die durch eine akzelerierte Knochenreifung zu einer weiteren Verminderung der Endgroesse fuehrt. Hypothalamo-hypophysaer bedingte Stoerungen der Schilddruesenfunktion und der Nebennierenrindenfunktion sind seltener und werden in der Regel erst nach hypothalamo-hypophysaeren Strahlendosen von ueber 40 Gy beobachtet. Schlussfolgerung: Ueberlebende eines Hinrtumors im Kindesalter muessen als Langzeitueberlebende betrachtet werden, bei denen bereits kurz nach Ende der Tumortherapie die ersten der therapiebedingten Spaetfolgen auftreten. Um fuer den individuellen Patienten eine maximale Lebensqualitaet zu erreichen, ist eine langfristige Betreuung mit enger Kooperation der verschiedenen beteiligten Fachdisziplinen unabdingbar. (orig.)

  6. Review: implants.

    Science.gov (United States)

    Ashton, P; Blandford, D L; Pearson, P A; Jaffe, G J; Martin, D F; Nussenblatt, R B

    1994-01-01

    An implantable sustained release device has been developed to treat chronic disorders of the eye. The device, consisting of a central core of drug encased in layers of permeable and impermeable polymers, can be implanted subconjunctivally or intravitreally. This technique was used to develop a ganciclovir device which, when implanted into the vitreous, maintains therapeutic vitreous levels of drug for 8 months. Initial studies in patients with cytomegalovirus (CMV) retinitis indicate that this treatment may offer better control of the disease and fewer side effects than existing therapies. Cyclosporine A devices were prepared for the treatment of uveitis. Early data suggests that these devices maintain therapeutic levels in the vitreous for approximately 3 years. Work on efficacy and toxicity is continuing. Although clinical applications of these devices are likely to be restricted to diseases requiring chronic drug therapy, they can be used to investigate optimal delivery rates. Subconjunctivally implanted devices releasing 5-FU for 12 days maintained filters in cynomolgus monkeys for 3 months. Similar devices maintained low intraocular pressure in 75% of high risk filter patients.

  7. HRCT and bronchial asthma: visualization of the pathophysiologic changes of the pulmonary parenchyma after inhalation provocation; HRCT und Asthma bronchiale: Visualisierung pathophysiologischer Veraenderungen des Lungenparenchyms nach inhalativer Provokation

    Energy Technology Data Exchange (ETDEWEB)

    Schueller, G.; Neumann, K.; Helbich, T.; Herold, C.J. [Univ. Klinik fuer Radiodiagnostik, Abt. fuer konservative Faecher, Vienna (Austria); Riemer, H. [Univ. Klinik fuer Innere Medizin IV, Abt. fuer Pulmologie, Vienna (Austria); Backfrieder, W. [Allgemeines Krankenhaus, Vienna (Austria). Inst. fuer Biomedizinische Technik und Physik; Sertl, K. [Krankenhaus der Stadt Wien-Floridsdorf (Austria). Abt. fuer Innere Medizin; Pittner, B. [Vienna Univ. (Austria). Inst. fuer Medizinische Statistik

    2004-03-01

    alterations of the lung parenchyma subsequent to inhalation provocation. In healthy individuals, these parenchymal alterations were not documented by pulmonary function tests. (orig.) [German] Ziel: Bei Patienten mit leichtem intermittierenden Asthma bronchiale, aber mit Hyperreaktivitaet auch im freien Intervall, und bei gesunden Probanden sollen mithilfe der hoch aufloesenden Computertomographie (HRCT) roentgenmorphologische Veraenderungen des Lungenparenchyms vor sowie nach inhalativer Histaminprovokation und darauf folgender Lyse durch Salbutamol charakterisiert und mit Ergebnissen von Lungenfunktionstests (FEV{sub 1}, Blutgase) verglichen werden. Methoden: Fuenfzehn Asthmatiker mit bronchialer Hyperreaktivitaet mit FEV{sub 1}-Abfall>20% und PaO{sub 2}-Abfall>10 mmHg nach Provokation (PC20%+), zwoelf Asthmatiker mit FEV{sub 1}-Abfall<20% und PaO{sub 2}-Abfall>10 mmHg nach Provokation (PC20%-) sowie acht Probanden ohne bronchiale Hyperreaktivitaet wurden mit der spirometrisch kontrollierten HRCT bei hohen Fuellungsvolumina vor und nach inhalativer Bronchoprovokation sowie nach Broncholyse untersucht. Es wurden die gesamte und periphere Lungendichte sowie der strukturelle Anteil solider pulmonaler Strukturen bestimmt. Ergebnisse: In allen Gruppen fand sich nach Provokation eine signifikante Abnahme (p<0,0005), nach Broncholyse eine signifikante Zunahme (p<0,0002) der Lungendichte. Die Aenderungen solider Lungenanteile waren nach Provokation und Lyse nicht signifikant unterschiedlich (p>0,05). Bei den hyperreaktiven Patienten fanden sich signifikante PaO{sub 2}-Abnahmen nach Provokation sowie signifikante PaO{sub 2}-Steigerungen nach Lyse (p<0,05). In der Gruppe PC20%+ wurde nach Provokatio ein mittlerer FEV{sub 1}-Abfall von 27,8% beobachtet, in den anderen Gruppen war dieser <20%. Es wurden keine signifikanten Korrelationen zwischen radiologischen und funktionellen Lungentestergebnissen asthmatischer Patienten und Probanden beobachtet. Die bei gesunden Probanden mit der

  8. Transperineal gold marker implantation for image-guided external beam radiotherapy of prostate cancer. A single institution, prospective study

    Energy Technology Data Exchange (ETDEWEB)

    Jorgo, Kliton; Agoston, Peter; Major, Tibor; Takacsi-Nagy, Zoltan; Polgar, Csaba [National Institute of Oncology, Centre of Radiotherapy, Budapest (Hungary)

    2017-06-15

    Patienten drei roentgendichte Goldmarker unter transrektaler Ultraschallkontrolle und Lokalanaesthesie transperineal in die Prostata implantiert. Die Patienten beantworteten 1 Woche nach Implantation einen Fragebogen ueber Schmerzempfinden, Dysurie, Harnausscheidungsfrequenz, Nykturie, rektale Blutung, Haematurie, Haematospermie oder Fiebersymptome, verursacht durch die Implantation. Im Schmerzscore von 1-10 beschreibt 1 sehr schwache und 10 unertraeglich starke Schmerzen. Die implantierten Goldmarker wurden zur taeglichen Kontrolle und Online-Korrektur bei der IGRT genutzt. In den Frageboegen berichtete kein Patienten ueber Fieber, Infektion, Dysurie oder rektale Blutung nach Implantation. Von 300 Patienten hatten 12 (4 %) Haematospermien und 43 (14 %) Haematurien, die jeweils 3,4 und 1,8 Tagen andauerten. Der durchschnittliche Schmerzscore war 4,6 (Spanne 0-9). Von 300 Patienten klagten 87 (29 %) nach dem Eingriff ueber leichte Schmerzen innerhalb von 1,5 Tagen; kein Patienten benoetigte nach Implantation Analgetika. Insgesamt 105 Patienten (35 %) berichteten ueber weniger, 80 Patienten (27 %) ueber mehr und 94 Patienten (31 %) ueber gleich starke Schmerzen waehrend der Implantation im Vergleich zur Biopsie. Diese Frage hatten 21 Patienten, bei denen eine Biopsie unter Allgemeinanaesthesie durchgefuehrt wurde, nicht beantwortet. Die transperineale Implantation von Goldmarkern unter Lokalanaesthesie wurde gut vertragen. Komplikationen waren begrenzt; Rate und Frequenz von perioperativ auftretenden Schmerzen waren vergleichbar mit denen einer Biopsie. Die Methode ist in der klinischen Praxis sicher durchfuehrbar. (orig.)

  9. Infectious complications in implant based breast surgery and implications for plastic surgeons [Infektiöse Komplikationen bei alloplastischen Brustoperationen und Implikationen für Plastische Chirurgen

    Directory of Open Access Journals (Sweden)

    Horch, Raymund E.

    2013-07-01

    nach Einsetzen von medizinischen Implantaten allgemein. Dieser Artikel gibt einen Überblick über die aktuelle Literatur und diskutiert mögliche Fragen der Problematik der Infektion nach der Implantation von Brust-Prothesen.Zusammenfassend kann das Wiedereinsetzen von Implantaten für den Einmalgebrauch nicht empfohlen werden und sollte daher bei Verdacht auf eine Infektion unbedingt unterlassen werden. Nach derzeitigem Kenntnisstand sollten kontaminierte Implantate entfernt, eine bestehende Infektion zunächst ausgeheilt und, falls erforderlich, erst nach einer Regenerationsphase ein neues Implantat eingesetzt werden. Alternativ sollte immer auch ein Verfahrenswechsel auf eine Eigengewebsrekonstruktion in Betracht gezogen werden, insbesondere wenn vorherige alloplastische Verfahren versagt haben und die lokale Gewebesituation im Empfängergebiet etwa durch eine Strahlentherapie ungünstig ist.

  10. Cochlear Implant

    Directory of Open Access Journals (Sweden)

    Mehrnaz Karimi

    1993-03-01

    Full Text Available People with profound hearing loss are not able to use some kinds of conventional amplifiers due to the nature of their loss. In these people, hearing sense is stimulated only when the auditory nerve is activated via electrical stimulation. This stimulation is possible through cochlear implant. In fact, for the deaf people who have good mental health and can not use surgical and medical treatment and also can not benefit from air and bone conduction hearing aids, this device is used if they have normal central auditory system. The basic parts of the device included: Microphone, speech processor, transmitter, stimulator and receiver, and electrode array.

  11. Cochlear Implant

    Directory of Open Access Journals (Sweden)

    Mehrnaz Karimi

    1992-04-01

    Full Text Available People with profound hearing loss are not able to use some kinds of conventional amplifiers due to the nature of their loss . In these people, hearing sense is stimulated only when the auditory nerve is activated via electrical stimulation. This stimulation is possible through cochlear implant. In fact, for the deaf people who have good mental health and can not use surgical and medical treatment and also can not benefit from air and bone conduction hearing aids, this device is used if they have normal central auditory system. The basic parts of the device included: Microphone, speech processor, transmitter, stimulator and receiver, and electrode array.

  12. Breast reconstruction - implants

    Science.gov (United States)

    Breast implants surgery; Mastectomy - breast reconstruction with implants; Breast cancer - breast reconstruction with implants ... to make reconstruction easier. If you will have breast reconstruction later, your surgeon will remove enough skin ...

  13. Degradation of implant materials

    CERN Document Server

    Eliaz, Noam

    2012-01-01

    This book surveys the degradation of implant materials, reviewing in detail such failure mechanisms as corrosion, fatigue and wear, along with monitoring techniques. Surveys common implant biomaterials, as well as procedures for implant retrieval and analysis.

  14. Hernia Surgical Mesh Implants

    Science.gov (United States)

    ... Procedures Implants and Prosthetics Hernia Surgical Mesh Implants Hernia Surgical Mesh Implants Share Tweet Linkedin Pin it ... between patients and their surgeons. What is a Hernia? A hernia occurs when an organ, intestine or ...

  15. Rehabilitation of deaf persons with cochlear implants; Rehabilitation Hoergeschaedigter mit Cochlearimplantaten

    Energy Technology Data Exchange (ETDEWEB)

    Gstoettner, W.; Hamzavi, J. [Universitaetsklinik fuer Hals-Nasen-Ohrenheilkunde, Wien (Austria); Czerny, C. [Universitaetsklinik fuer Radiologie, Wien (Austria)

    1997-12-01

    -gewichtete Turbospinechosequenz mit 0,7 mm Schichtdicke) haben sich nach unseren Erfahrungen bewaehrt. Das postoperative Uebersichtsroentgen, modifiziert nach Chausse III, bietet gute Informationen ueber die Lage des Implantates und ueber die Insertion der Stimulationselektrode in die Schnecke. (orig.)

  16. Increasing oil prices promote sales. Tuebingen-based market leader introduced pellet heating systems in Germany; Steigender Oelpreis als Konjunkturprogramm. Tuebinger Marktfuehrer brachte Pelletheizung nach Deutschland

    Energy Technology Data Exchange (ETDEWEB)

    Janzing, B.

    2001-09-01

    It was a Tuebingen organisation that first introduced wood pellet heating systems in Germany. Sales were improved by the increasing oil price. [German] Ein Tuebinger Unternehmen brachte die Holzpellets-Heizung nach Deutschland. Ein steigender Oelpreis diente dabei als 'Konjunkturprogramm'. (orig.)

  17. Der Konflikt zwischen einzelstaatlichem Verbraucherrecht und freiem Warenverkehr nach Art. 30 EWGV im Vergleich mit US-amerikanischen Erfahrungen und Lösungen

    OpenAIRE

    Merke, Gerd

    1987-01-01

    Der Konflikt zwischen einzelstaatlichem Verbraucherrecht und freiem Warenverkehr nach Art. 30 EWGV im Vergleich mit US-amerikanischen Erfahrungen und Lösungen. - Rheinfelden : Schäuble, 1987. - XIV, 211 S. - Zugl.: Augsburg, Univ., Diss. - (Recht-Wirtschaft-Gesellschaft : Recht ; 5)

  18. Nanotechnology and Dental Implants

    OpenAIRE

    Sandrine Lavenus; Guy Louarn; Pierre Layrolle

    2010-01-01

    The long-term clinical success of dental implants is related to their early osseointegration. This paper reviews the different steps of the interactions between biological fluids, cells, tissues, and surfaces of implants. Immediately following implantation, implants are in contact with proteins and platelets from blood. The differentiation of mesenchymal stem cells will then condition the peri-implant tissue healing. Direct bone-to-implant contact is desired for a biomechanical anchoring of i...

  19. Die Beziehungen zwischen E. F. v. Schlotheim und D. L. G. Karsten (nach den Briefen von Karsten an Schlotheim

    Directory of Open Access Journals (Sweden)

    G. Hoppe

    2001-01-01

    Full Text Available Ein anonymes Angebot zum Mineraltausch von 1790 und anschließende, bisher unbekannte Briefe leiteten die Beziehungen von D. L. G. Karsten zu E. F. v. Schlotheim ein. Der später berühmte Paläontologe Schlotheim zeigte sich noch ganz als mineralogischer Sammler. Nach dem Studium Schlotheims an der Bergakademie in Freiberg setzten sich die Kontakte fort. Sie lassen Karstens lebhaftes Interesse an Schlotheims beginnenden paläontologischen Arbeiten erkennen. So far unknown letters from D. L. G. Karsten to E. F. v. Schlotheim and an offer to change minerals from the year 1790 stated the connection between both men. The later famous paleontologist Schlotheim was a mineralogical collector at that time. After studying in Freiberg, Schlotheim developed paleontological interests. In this Karsten confirmed him. doi:10.1002/mmng.20010040103

  20. Aktuelle Technik der Bruststraffung beim Mann nach Gewichtsverlust [Modern technique in male breast contouring after weight loss

    Directory of Open Access Journals (Sweden)

    Stoff, Alexander

    2013-08-01

    Full Text Available [english] The morbid adiposity and its medical consequences demonstrates a growing problem of our current prosperous society. Due to a significant improvement of bariatric techniques and a reduplication of adipose patients during the 20 century, the number of patients, who present to plastic surgeons with a new degree of suffering, has been growing steadily. Initially, the female patients were in the majority, which has been more balanced nowadays.The male breast is a body region that primarily symbolizes masculinity and strenght. In male patients after massive weight loss, this body region remains as an extremly deflated breast envelope without any sign of possible retraction. The plastic surgeon may choose from different single or combinated ltechniques, which are indicated depending on the local and adjacent tissue characteristics.We are presenting our modified technique of male breast reshaping, referring to the technique of Aly, except for a NAC transposition on a central pedicle. The central pedicle is hereby preserved from resection after tremendous liposuction. This central pedicle technique allows a safe and uncomplicated NAC transposition with significant advantages compared to free NAC-Transposition techniques in terms of aesthetical and functional outcome. [german] Die morbide Adipositas mit ihren Langzeitfolgen ist ein zunehmendes Problem unserer heutigen Wohlstandsgesellschaft. Mit einer Verdoppelung der betroffenen Patienten im Laufe des 20. Jahrhunderts ist gleichzeitig durch rasante Verbesserung der bariatrischen Eingriffe auch die Zahl der Patienten signifikant und stetig gestiegen, die sich nach massiver Gewichtsreduktion nun mit neuem Leidensdruck beim Plastischen Chirurgen vorstellen. Hierbei ist die anfängliche Überzahl der weiblichen Patienten in ein ausgewogenes Verhältnis der betroffenen Geschlechter übergegangen. Die männliche Brust, eine Körperregion, die in erster Linie Männlichkeit und Stärke symbolisiert und

  1. Complications after cardiac implantable electronic device implantations

    DEFF Research Database (Denmark)

    Kirkfeldt, Rikke Esberg; Johansen, Jens Brock; Nohr, Ellen Aagaard

    2013-01-01

    Complications after cardiac implantable electronic device (CIED) treatment, including permanent pacemakers (PMs), cardiac resynchronization therapy devices with defibrillators (CRT-Ds) or without (CRT-Ps), and implantable cardioverter defibrillators (ICDs), are associated with increased patient...

  2. Active cheerleading with radial nerve palsy following supracondylar humerus fracture [Cheerleading mit Radialisparese nach suprakondylärer Humerusfraktur

    Directory of Open Access Journals (Sweden)

    Herold, Christian

    2013-10-01

    Full Text Available [english] Cheerleading is associated with substantial morbidity. As such, cheerleading fall-related injuries may cause serious to fatal outcomes especially falls from attempted pyramids. We report on a female adolescent cheerleader age 14 suffering a supracondylar humerus fracture related to a fall from a pyramid. Unfortunately, lateral pinning led to complete iatrogenic radial nerve palsy. However, given an intriguing compensatory athletic function of the wrist she was able to perform cheerleading artistic figures such as flic-flac within four months after the injury with a radial nerve palsy, which is highlighted in an attached video. 18 months after the radial palsy she was admitted to our hospital and underwent neuroma resection of the initially transsected radial nerve at the elbow and sural nerve grafting for radial nerve palsy.[german] Cheerleading kann zu verschiedensten Unfällen führen. Insbesondere bei dem Versuch Pyramiden zu bilden sind bereits Todesfälle aufgetreten. Wir berichten von einer 14-jährigen Cheerleaderin welche bei dem Versuch eine Pyramide zu bilden stürzte und sich eine suprakondyläre Humerusfraktur zuzog. Bei der osteosynthetischen Versorgung kam es leider zu einer kompletten Durchtrennung des N. radialis. Dennoch konnte sie bei der gegebenen erstaunlichen Kompensation ihrer Handgelenksgeweglichkeit weiterhin schwierige Cheerleading Übungen wie Flick-Flack durchführen, was im beigefügten Video verdeutlicht wird. 18 Monate nach Eintreten der Radialisparese wurde sie in unserer Klinik vorstellig und es wurde nach einer Neuromresektion eine Suralis Interposition zur Nervenrekonstruktion durchgeführt.

  3. Retrograde peri-implantitis

    Directory of Open Access Journals (Sweden)

    Mohamed Jumshad

    2010-01-01

    Full Text Available Retrograde peri-implantitis constitutes an important cause for implant failure. Retrograde peri-implantitis may sometimes prove difficult to identify and hence institution of early treatment may not be possible. This paper presents a report of four cases of (the implant placed developing to retrograde peri-implantitis. Three of these implants were successfully restored to their fully functional state while one was lost due to extensive damage. The paper highlights the importance of recognizing the etiopathogenic mechanisms, preoperative assessment, and a strong postoperative maintenance protocol to avoid retrograde peri-implant inflammation.

  4. Lassen Veränderungen des Prostata-spezifischen Antigen- (PSA- Spiegels nach Prostatastanzbiopsie Rückschlüsse auf das pathologische Ergebnis zu?

    Directory of Open Access Journals (Sweden)

    Volkmer BG

    2004-01-01

    Full Text Available Einleitung: Die diagnostische Biopsie der Prostata führt bekanntermaßen zum Anstieg des Serum-PSA-Spiegels. Diese prospektive Untersuchung sollte die Frage klären, ob die Änderungen des Serum-PSA-Spiegels nach Stanzbiopsie Rückschlüsse auf das histologische Ergebnis zulassen und so als Entscheidungshilfe bei der Frage der Rebiopsie dienen können. Patienten und Methoden: Insgesamt 79 konsekutive Patienten mit klinischem Verdacht auf das Vorliegen eines Prostatakarzinoms (PCA und einem Gesamt-PSA 50 ng/ml wurden in die Studie eingeschlossen. Ausschlußkriterien waren klinische Hinweise für eine Prostatitis und Prostatabiopsie innerhalb der letzten 3 Monate. Die Serum-PSA-Werte wurden mit einem ultrasensitiven Enzymimmunoassay bestimmt. Die Bestimmung des Gesamt-PSA und des freien PSA im Serum erfolgte unmittelbar vor und 60 Minuten nach der Biopsie. Die Spiegel des Gesamt-PSA und freien PSA, sowie die f/t-PSA-Ratio vor und nach Biopsie wurden in Korrelation zum histologischen Ergebnis gesetzt. Ergebnisse: 86 Biopsieserien wurden bei 79 Patienten durchgeführt. 38 Biopsieserien diagnostizierten ein PCA, 48 eine benigne Prostatahyperplasie (BPH. Die abschließende Histologie nach wiederholter Biopsie war PCA und BPH in je 43 Fällen. Insgesamt fand sich ein Anstieg des durchschnittlichen Gesamt-PSA von 18,39 ng/ml auf 107,8 ng/ml, des durchschnittlichen freien PSA von 3,43 ng/ml auf 33,7 ng/ml und der durchschnittlichen f/t PSA-Ratio von 18,1 % auf 52,0 %. Es fand sich keine Korrelation zwischen dem Anstieg dieser Parameter und der Anzahl der Biopsiezylinder (4–51. Bezüglich des histologischen Befundes ergaben sich statistisch signifikante Unterschiede für das Gesamt-PSA vor und die f/t PSA-Ratio vor und nach Stanzbiopsie. Schlußfolgerung: Die Analyse der PSA-Parameter nach Stanzbiopsie bietet keine zusätzliche Information über die konventionellen PSA-Parameter vor der Biopsie hinaus. Sie korrelieren vor allem nicht mit falsch

  5. Predictive parameters of infectiologic complications in patients after TIPSS; Praediktive Parameter infektiologischer Komplikationen bei Patienten nach TIPSS-Anlage

    Energy Technology Data Exchange (ETDEWEB)

    Cohnen, M.; Saleh, A.; Moedder, U. [Institut fuer Diagnostische Radiologie, Universitaetsklinikum Duesseldorf (Germany); Luethen, R.; Bode, J.; Haeussinger, D. [Klinik fuer Gastroenterologie, Hepatologie und Infektiologie, Universitaetsklinikum Duesseldorf (Germany); Daeubener, W. [Institut fuer Mikrobiologie und Virologie, Universitaetsklinikum Duesseldorf (Germany)

    2003-02-01

    Aim To define predictive parameters of a complicated clinical course after the TIPSS procedure. Blood cultures were drawn prospectively in 41 patients from a central line and from the portal venous blood before stent placement as well as from the central line 20 min after intervention. C-reactive proteine (CRP) (mg/dl) and white blood cell count (WBC,/{mu}l) on the day of TIPSS-procedure (d0), the first (d1) and seven (d7) days after TIPSS were compared in patients with a complicated clinical course (spontaneous bacterial peritonitis, pneumonia, sepsis; group I) to patients without clinical complications (group II) Group I showed a significant increase in CRP (d0: 1.8{+-}1.0; d1: 3.2{+-}1.5; d7: 4.3{+-}3.2), and white blood cell count (d0: 7700{+-}2600; d1: 10800{+-}2800; d7: 7500{+-}1800) on the first day after TIPSS-procedure in comparison to group II (CRP: d0: 1.6{+-}0.6; d1: 1.8{+-}1.0; d7: 1.9{+-}0.6. WBC: d0: 6900{+-}1500; d1: 8000{+-}1600; d7: 7600{+-}1400).Microbiological analysis showed in 12% skin or oral flora in the last sample. The course of CRP and WBC-count during the first week after TIPSS procedure may indicate patients with a potential risk of a complicated clinical course. (orig.) [German] Fragestellung Definition praediktiver Parameter infektiologischer Komplikationen bei Patienten nach TIPSS-Anlage.Methodik Bei 41 Patienten wurden Blutproben prospektiv vor intrahepatischer Stentanlage zentralvenoes und portalvenoes sowie 20 min postinterventionell erneut zentralvenoes entnommen und mikrobiologisch analysiert. C-reaktives Protein (CRP) (mg/dl) und Leukozytenzahl (/{mu}l) wurden am Interventionstag (d0), am 1. (d1) sowie 7 Tage (d7) postinterventionell bestimmt. Patienten mit kompliziertem Verlauf (spontane bakterielle Peritonitis,Pneumonie, Sepsis; Gruppe 1) wurden von Patienten ohne klinische Komplikationen (Gruppe 2) unterschieden.Ergebnisse Gruppe 1 wies einen signifikanten Anstieg des CRP (d0: 1,8{+-}1,0; d1: 3,2{+-}1,5; d7: 4,3{+-}3,2) und

  6. Implantation of a new access device for hemodialysis (Dialock): initial experience in 5 patients

    Energy Technology Data Exchange (ETDEWEB)

    Schmitz-Rode, T.; Buecker, A.; Tacke, J.; Wingen, M.; Guenther, R.W. [Dept. of Diagnostic Radiology, Universitaetsklinikum der RWTH Aachen (Germany); Noah, M. [Dept. of Plastic Surgery, Universitaetsklinikum der RWTH Aachen (Germany); Ketteler, M. [Dept. of Nephrology, Universitaetsklinikum der RWTH Aachen (Germany)

    2001-06-01

    A new hemodialysis access port system was implanted. Methods: The Dialock{sup TM} consists of a port-like double-valve, implanted subcutaneously below the clavicle, which is attached to two catheters, placed in the right atrium via the jugular vein. The device has been implanted in 5 patients (4 female, 1 male). Results: In all 5 patients the implantation of the catheters and the port was technically successful. Total average duration of dialysis was 3.6 months. Two patients developed a port pocket hematoma 10-14 days post implantation, one of them required surgical revision. One port was explanted due to septicemia, whereas a port infection was not confirmed. One patient showed a thrombotic occlusion of both catheter tips 8 days after implantation, fixed by catheter exchange. Another patient presented with slight migration of the port catheters, which was managed by refixation of the port within the pocket. Beside these complications, the devices were working well. Conclusion: The Dialock system offers an interesting alternative to external catheters for hemodialysis. With respect to the complications it deserves further studies to determine its future role in the field of vascular access. (orig.) [German] Ein neues Haemodialyse-Portsystem wurde klinisch erprobt. Methoden: Das Dialock{sup TM}-System besteht aus einem Doppelventil-Port, der subkutan unterhalb der Klavikel implantiert wird. An den Port sind zwei Katheter angeschlossen, die subkutan getunnelt transjugulaer im rechten Vorhof platziert werden. Das System wurde in 5 Patienten implantiert (4 Frauen, 1 Mann). Ergebnisse: Bei allen 5 Patienten war die Katheter- und Portimplantation technisch erfolgreich. Die bisherige mittlere Dialyse-Dauer betraegt 3,6 Monate. Bei zwei Patienten bildete sich ein Haematom der Porttasche 10-14 Tage nach der Implantation. In einem Fall war eine operative Ausraeumung erforderlich. Ein Patient entwickelte eine Sepsis, worauf das Portsystem explantiert wurde. Eine Portinfektion

  7. MR imaging of the lateral collateral ligaments after ankle sprain; Aussenbandrupturen des Sprunggelenkes - Darstellung mit der MRT vor und nach funktioneller Therapie

    Energy Technology Data Exchange (ETDEWEB)

    Grebe, P. [Klinik fuer Radiologie der Universitaetsklinik, Mainz (Germany); Kreitner, K.F. [Klinik fuer Radiologie der Universitaetsklinik, Mainz (Germany); Roeder, W. [Abt. fuer Chirurgie, St-Hildegardis-Krankenhaus, Mainz (Germany); Kersjes, W. [Klinik fuer Radiologie der Universitaetsklinik, Mainz (Germany); Hennes, R. [Abt. fuer Allgemein- und Unfallchirurgie, St. Josefshospital, Wiesbaden (Germany); Runkel, M. [Unfallchirurgische Klinik der Unversitaetsklinik, Mainz (Germany)

    1995-09-01

    35 patients with ankle sprain were examined by MRI and stress radiographs. 13 were operated afterwards, 22 patients underwent a functional conservative therapy and were examined by MRI and stress radiographs and second time after three months. MRI reports were correct in 12 of 13 operated cases. After conservative therapy we did not find any disrupted ankle ligament. MRI showed intact ligaments thickened by scar. (orig./MG) [Deutsch] 35 Patienten mit klinischem Verdacht auf Aussenbandruptur wurden mit der MRT untersucht. 13 Patienten wurden operiert, 22 konzervativ therapiert. Letztere wurden nach drei Monaten erneut mit MRT und gehaltenen Aufnahmen untersucht. Die MRT-Befunde stimmten in 12 von 13 Faellen mit den operativ erhobenen Befunden ueberein. Nach dreimonatiger konzervativer Therapie waren alle 22 Sprunggelenke stabil. Die rupturierten Baender stellten sich verdickt und durchgaengig dar. (orig./MG)

  8. The bioceramic implant: evaluation of implant exposures in 419 implants.

    Science.gov (United States)

    Jordan, David R; Klapper, Stephen R; Gilberg, Steven M; Dutton, Jonathan J; Wong, Amy; Mawn, Louise

    2010-01-01

    To compare the rate of exposure in the immediate 3-month postoperative follow-up period with the rate of exposure after the immediate postoperative period in 419 anophthalmic patients with a bioceramic (aluminum oxide) orbital implant. This is a retrospective, clinical case series of 419 patients who received a bioceramic orbital implant. All patients who presented to five oculofacial surgeons (D.J., S.G., J.D., S.K., L.M.) from January 1, 2000, to June 1, 2007, who received a bioceramic orbital implant and had a minimum of 3 months of follow-up were included in this study. The authors analyzed age, gender, type of surgery, implant size, peg system, follow-up duration, time of pegging, and problems encountered. The data from the patients with greater than 3 months of follow-up with exposure of the bioceramic implant are detailed in this report. There were 353 patients followed for 3 to 96 months with an average of 30 months of follow-up (median 23 months). Implant exposure occurred in 32/353 bioceramic implants (9.1%). Six of the 32 (19%) exposures occurred during the 90-day postoperative period (average 2.1 months). Twenty-six (81%) exposures occurred outside of the 90-day postoperative period (average 27.5 months, range 4-82 months). Implant exposures can occur anytime postimplant placement. This review discovered an implant exposure rate of 9.1%, with the majority of the exposures occurring after the postoperative follow-up period. Patients with porous orbital implants should be followed on a long-term basis to detect this complication.

  9. Radiological findings, evaluation and treatment of patellofemoral pain after total knee arthroplasty; Radiologische Diagnostik, Beurteilung und Behandlung des patellofemoralen Schmerzes nach primaerer Knieendoprothetik

    Energy Technology Data Exchange (ETDEWEB)

    Springorum, H.R.; Keshmiri, A.; Heers, G.; Renkawitz, T.; Grifka, J.; Baier, C. [Asklepios Klinikum Bad Abbach, Orthopaedische Klinik fuer die Universitaet Regensburg, Bad Abbach (Germany)

    2012-11-15

    Total knee arthroplasty (TKA) is one of the most successful operative procedures over the last decades in orthopedic surgery; however, some patients suffer from pain, limited range of motion, instability, infections or other complications postoperatively. Patellofemoral pain (PFP) in particular is a common problem after TKA and often necessitates revision surgery. Mainly increasing and localized contact pressure and patella maltracking are held responsible for PFP but the reasons vary. Diagnostics and therapy of PFP is not easy to manage and should be treated following a clinical pathway. The authors suggest that patients with PFP should be categorized after basic diagnostic measures according to the suspected diagnosis: (1) tendinosis, (2) mechanical reasons, (3) intra-articular non-mechanical reasons and (4) neurogenic/psychiatric reasons. Efficient application of special diagnostic measures and further therapy is facilitated by this classification. (orig.) [German] Die endoprothetische Versorgung des Kniegelenks ist eine Operation mit hohem Zugewinn an Lebensqualitaet. Dennoch sind je nach Literaturstelle bis zu 50% der Patienten von Schmerzen, Bewegungseinschraenkung, Instabilitaet, Infektion oder anderen Komplikationen betroffen. Insbesondere der patellofemorale Schmerz (PFS) ist eine haeufige Komplikation nach primaerer Knieendoprothetik und wird je nach Literatur mit 1-50% der Faelle angegeben. Insbesondere der erhoehte retropatellare Anpressdruck und eine schlechte Fuehrung der Patella werden fuer den PFS verantwortlich gemacht, doch die Ursachen sind vielfaeltig. Diagnostik und Behandlung sind komplex und sollten strukturiert durchgefuehrt werden. Nach der Basisdiagnostik schlagen die Autoren daher eine Einteilung in eine der 4 Gruppen vor: (1) Tendinosen, (2) mechanische Probleme, (3) intraartikulaere nichtmechanische Probleme, (4) neurogene/psychische Probleme. Durch die Einteilung in diese verschiedenen Gruppen werden eine effiziente spezielle

  10. Implant success!!!.....simplified

    Directory of Open Access Journals (Sweden)

    Luthra Kaushal

    2009-01-01

    Full Text Available The endeavor towards life-like restoration has helped nurture new vistas in the art and science of implant dentistry. The protocol of "restoration-driven implant placement" ensures that the implant is an apical extension of the ideal future restoration and not the opposite. Meticulous pre-implant evaluation of soft and hard tissues, diagnostic cast and use of aesthetic wax-up and radiographic template combined with surgical template can simplify the intricate roadmap for appropriate implant treatment. By applying the harmony of artistic skill, scientific knowledge and clinical expertise, we can simply master the outstanding implant success in requisites of aesthetics, phonetics and function.

  11. Implant success!!!.....simplified.

    Science.gov (United States)

    Luthra, Kaushal K

    2009-01-01

    The endeavor towards life-like restoration has helped nurture new vistas in the art and science of implant dentistry. The protocol of "restoration-driven implant placement" ensures that the implant is an apical extension of the ideal future restoration and not the opposite. Meticulous pre-implant evaluation of soft and hard tissues, diagnostic cast and use of aesthetic wax-up and radiographic template combined with surgical template can simplify the intricate roadmap for appropriate implant treatment.By applying the harmony of artistic skill, scientific knowledge and clinical expertise, we can simply master the outstanding implant success in requisites of aesthetics, phonetics and function.

  12. [Biomaterials in cochlear implants].

    Science.gov (United States)

    Stöver, T; Lenarz, T

    2009-05-01

    Cochlear implants (CI) represent the "gold standard" for the treatment of congenitally deaf children and postlingually deafened adults. Thus, cochlear implantation is a success story of new bionic prosthesis development. Owing to routine application of cochlear implants in adults but also in very young children (below the age of one), high demands are placed on the implants. This is especially true for biocompatibility aspects of surface materials of implant parts which are in contact with the human body. In addition, there are various mechanical requirements which certain components of the implants must fulfil, such as flexibility of the electrode array and mechanical resistance of the implant housing. Due to the close contact of the implant to the middle ear mucosa and because the electrode array is positioned in the perilymphatic space via cochleostomy, there is a potential risk of bacterial transferral along the electrode array into the cochlea. Various requirements that have to be fulfilled by cochlear implants, such as biocompatibility, electrode micromechanics, and although a very high level of technical standards has been carried out there is still demand for the improvement of implants as well as of the materials used for manufacturing, ultimately leading to increased implant performance. General considerations of material aspects related to cochlear implants as well as potential future perspectives of implant development will be discussed.

  13. Implantable Medical Devices

    Science.gov (United States)

    ... Artery Disease Venous Thromboembolism Aortic Aneurysm More Implantable Medical Devices Updated:Sep 16,2016 For Rhythm Control ... a Heart Attack Introduction Medications Surgical Procedures Implantable Medical Devices • Life After a Heart Attack • Heart Attack ...

  14. The contribution of MRI to the detection of endovascular aneurysm repair; Wertigkeit der MRT in der Erkennung von Leckagen nach endovaskulaerer Aneurysmaausschaltung

    Energy Technology Data Exchange (ETDEWEB)

    Kraemer, S.C.; Goerich, J.; Aschoff, A.J.; Wisianowski, C.; Brambs, H.J. [Ulm Univ. (Germany). Abt. fuer Diagnostische Radiologie; Pamler, R. [Ulm Univ. (Germany). Abt. fuer Gefaess- und Thoraxchirurgie

    2002-10-01

    Purpose: Evaluation of MR-imaging in the follow-up of patients after endovascular repair of abdominal aortic aneurysms concerning detection of endoleaks. Materials and Methods: In the postoperative follow-up after endovascular repair of aortic aneurysms, 10 consecutive patients (mean age: 68 years) were suspected to have an endoleak by helical CT and were scheduled for conventional angiography, preceded by supplemental MR-imaging to confirm or refute the diagnosis. The images of helical CT and MRI were evaluated by two independent readers concerning leak, feeding vessel and artifacts. Results: The follow-up MRI was able to detect all endoleaks (type 1 endoleak, n=7; type 2 endoleak, n=3) compared to all but one detected by helical CT. Of the 10 patients with an endoleak, MR-angiography visualized the feeding vessel in 7 patients and CT in one patient. MRI did show fewer metal artifacts from the stent wire than CT. For the visualization of feeding vessels and endoleaks, MRA achieved statistically significant superiority. In a single case, helical-CT was not reliable because of strange metal artefacts after previous coil embolization. Conclusion: MRI is comparable to helical-CT in detecting endoleaks and superior to CT in demonstrating the anatomy of the feeding vessel after endovascular repair of aortic aneurysms. The major advantages are fewer artifacts after coil embolization and absent radiation exposure. (orig.) [German] Ziel: Evaluation der Magnetresonanztomographie in der Nachsorge von Patienten nach endovaskulaerer Bauchaortenaneurysmaausschaltung in Bezug auf die Erkennung von Leckagen. Material und Methode: Im Zuge von Verlaufskontrollen nach endovaskulaerer, infrarenaler Aortenaneurysmaausschaltung wurden 10 konsekutive Patienten (Durchschnittsalter: 68 Jahre) nach auffaelligem CT-Befund bezueglich Aneurysmagroesse bzw. -perfusion fuer eine angiographische Klaerung vorgesehen. Anschliessend wurde zusaetzlich bei allen Patienten eine Kernspintomographie

  15. Implantable electronic medical devices

    CERN Document Server

    Fitzpatrick, Dennis

    2014-01-01

    Implantable Electronic Medical Devices provides a thorough review of the application of implantable devices, illustrating the techniques currently being used together with overviews of the latest commercially available medical devices. This book provides an overview of the design of medical devices and is a reference on existing medical devices. The book groups devices with similar functionality into distinct chapters, looking at the latest design ideas and techniques in each area, including retinal implants, glucose biosensors, cochlear implants, pacemakers, electrical stimulation t

  16. Three-phase skeletal scintigraphy: Perfusion and vitality of the femoral head after medial neck fracture and osteosynthesis; 3-Phasen-Skelettszintigraphie: Perfusion und Vitalitaet des Hueftkopfes nach medialer Schenkelhalsfraktur und Osteosynthese

    Energy Technology Data Exchange (ETDEWEB)

    Einert, A. [Abt. Nuklearmedizin, Radiologische Universtaetsklinik Freiburg (Germany); Bonnaire, F. [Abt. Unfallchirurgie, Radiologische Universitaetsklinik Freiburg (Germany); Simon, G.H. [Abt. Nuklearmedizin, Radiologische Universtaetsklinik Freiburg (Germany); Kuner, E. [Abt. Unfallchirurgie, Radiologische Universitaetsklinik Freiburg (Germany); Moser, E. [Abt. Nuklearmedizin, Radiologische Universtaetsklinik Freiburg (Germany)

    1996-09-01

    Perfusion and Vitality of the Femoral Head after Medial Neck Fracture and Osteosynthesis. Aims: To analyse with regard to necrosis the perfusion and vitality of the femoral head after medial neck fracture and repair by placement of a dynamic hip screw. Patients and Methods: Twenty-one patients were examined by scintigraphy immediately following operation as well as at 3 and 6 months postoperative for evaluation of dysfunctions of perfusion and mineralization. Results: Complete perfusion and mineralization defects with a tendency for revasularization at 3 months will be normal at 6 months. Persisting dysfunctions at 3 and 6 months will progress to femoral head necrosis irrespective of the fracture staging. Conclusions: Three-phase skeletal scintigraphy is a highly sensitive, non-invasive method for evaluating perfusion and revascularization of the femoral head after femoral neck fracture and repair by means of a dynamic hip screw. When perfusion of the femoral head is observed one week after the trauma, femoral head necrosis will not arise. Immobilization is necessary after partial or complete perfusion and mineralization dysfunctions until the scintigraphic findings return to normal. The present results may serve as a recommendation for loading after fracture repair with a dynamic hip screw. (orig.) [Deutsch] Ziel: Skelettszintigraphische Verlaufsuntersuchung von Perfusion und Vitalitaet des Hueftkopfes nach medialer Schenkelhalsfraktur und osteosynthetischer Versorgung mit dynamischer Hueftschraube (DHS) bezueglich der Beurteilung einer Hueftkopfenkrose. Material und Methode: Bei 21 Patienten 3-Phasen-Skelettszintigraphie unmittelbar postoperativ sowie nach 3 und 6 Monaten zur Beurteilung von Perfusions- und Mineralisationsstoerungen des Hueftkopfes. Ergebnisse: Teilausfaelle sind nach 3 Monaten ruecklaeufig. Vollstaendige Perfusions- und Mineralisationsdefekte mit Revaskularisierungstendenz nach 3 Monaten normalisieren sich nach 6 Monaten vollstaendig

  17. Diagnostic Imaging for Implants

    Directory of Open Access Journals (Sweden)

    Sanjay M Mallya

    2004-01-01

    Full Text Available Dental implants are a popular modality for permanent tooth replacement. The key to successful implant placement, its subsequent osseointegration and the final prosthetic rehabilitation is proper preoperative assessment. Diagnostic imaging plays an important role in the pre- and post-surgical evaluation process. Imaging is used to evaluate suitability of implant sites, aid in selection of appropriate implants, and finally evaluate implant placement and osseointegration. This article reviews the role of diagnostic imaging in the various phases and the advantages and limitations of the numerous imaging modalities.

  18. Feministische Gesellschaftstheorie und die Suche nach der Anschlussfähigkeit Feminist Social Theory in Search of Connections

    Directory of Open Access Journals (Sweden)

    Silke Schneider

    2002-07-01

    Full Text Available Der Sammelband „Soziale Verortung der Geschlechter“ stellt einen Querschnitt aktueller feministischer Theoriediskussionen vor. Dass bei der Suche nach angemessenen gesellschaftsanalytischen Kategorien sowohl die Klassiker/-innen der Politischen Theorie und Gesellschaftstheorie wie auch ihre Epigonen mannigfache Kritik-, aber auch vielversprechende Anschlußpunkte zu bieten haben, vermögen alle Beiträge zu vermitteln. Somit bietet der Band mit seiner breit angelegten Konzeption, die wichtige und durchaus gegensätzliche Theorien verbindet, einen guten Überblick und regt gleichzeitig zur vertiefenden Lektüre an. Bemerkenswert ist, dass nahezu alle Beiträge für eine Verbindung von Empirie und Theorie plädieren und hierbei die Einbeziehung einer historischen Perspektive als grundlegend und unabdingbar für eine Analyse der Geschlechterverhältnisse als Teil gesellschaftlicher Entwicklung erachtet wird.The anthology “The Social Positionings of Gender” presents a cross section of current debates in feminist theory. The authors show how authors of classical political and social theory as well as their successors offer plenty of room for criticism, but also promising starting points in the search for appropriate socio-analytic categories. This anthology not only offers a good overview over current theory by connecting different (and at times contradicting schools of thought, but also inspires to engage in further reading on these issues. What is particularly remarkable about this work is that almost all of the contributions plead for a combination of empirical research and theoretical work, as they consider the inclusion of a historical perspective as fundamental and indispensable for an analysis of gender relations as part of societal developments.

  19. MIBG scintigraphy of the heart; MIBG-Szintigrafie des Herzens

    Energy Technology Data Exchange (ETDEWEB)

    Hacker, M.; Weiss, M. [Klinik und Poliklinik fuer Nuklearmedizin, Klinikum der Ludwig-Maximilians-Univ. Muenchen (Germany)

    2009-03-15

    The sympathetic nervous system plays an important role in cardiovascular physiology. Planar MIBG with or without SPECT can be used to visualize the sympathetic innervation of the heart and the abnormalities in innervation caused by, for example, ischemia, heart failure, and arrhythmogenic disorders. Furthermore, cardiac neuronal imaging allows early detection of autonomic neuropathy in diabetes mellitus. Assessment of sympathetic nerve activity in patients with heart failure has been shown to provide important prognostic information, and cardiac neuronal imaging can potentially identify patients who are at increased risk of sudden death. Moreover, therapeutic effects of different treatment strategies can be evaluated by imaging. To establish the clinical utility of cardiac neuronal imaging, it will be necessary to determine the incremental value of innervation imaging to triage heart failure patients to medical therapy, CRT (with or without ICD), or heart transplantation. (orig.)

  20. Massenmedien und Versöhnung: Die Berichterstattung über den deutsch-französischen Friedensprozeß nach dem 2. Weltkrieg

    Directory of Open Access Journals (Sweden)

    Susanne Jaeger

    2003-10-01

    Full Text Available Der vorliegende Beitrag beinhaltet die ersten Ergebnisse einer Langzeitstudie, bei der flächendeckend die deutsche Nachkriegsberichterstattung über Frankreich von 1946 bis 1970 inhaltsanalytisch ausgewertet wurde. Die Studie stützt sich dabei auf das Modell der Nachrichtenfaktoren von Johan Galtung, welche nach seiner Ansicht die Auswahl der Themen bestimmen, die zu einer Nachricht werden. Genau in diesen Selektionsroutinen liegt jedoch die implizite Gefahr, Konflikte zu vertiefen statt sie einzudämmen bzw. durch ein breites Verständnis der Hintergründe gewaltfrei bearbeitbar zu machen. Für die Zeit nach einem Krieg könnten sie Hindernisse auf dem Weg zur Annäherung und Aussöhnung ehemaliger Gegner darstellen. Wie jedoch sieht die Berichterstattung nach dem Krieg tatsächlich aus? Zeigen Massenmedien Bereitschaft zu einer veränderten Berichterstattung? Der Fall der französisch-deutschen Aussöhnung, welcher als Beispiel für einen gelungenen Aussöhnungsprozess gelten kann, belegt, dass Friedensprozesse von den Medien durchaus adäquat begleitet werden können: Z.B. ist der Anteil "positiver" Themen bzw. Berichterstattung konsistent höher als der "negativer", und der Anteil von Non-Elite-Themen steigt an und kündet von Interesse an französischer Lebensart und Kultur. Die Ergebnisse zeigen, dass Negativismus in den Medien kein Naturgesetz ist, sondern überwunden werden kann, wenn Frieden und Versöhnung auf der Tagesordnung stehen.

  1. Bathymetry and Near-River Topography of the Naches and Yakima Rivers at Union Gap and Selah Gap, Yakima County, Washington, August 2008

    Science.gov (United States)

    Mastin, M.C.; Fosness, R.L.

    2009-01-01

    Yakima County is collaborating with the Bureau of Reclamation on a study of the hydraulics and sediment-transport in the lower Naches River and in the Yakima River between Union Gap and Selah Gap in Washington. River bathymetry and topographic data of the river channels are needed for the study to construct hydraulic models. River survey data were available for most of the study area, but river bathymetry and near-river topography were not available for Selah Gap, near the confluence of the Naches and Yakima Rivers, and for Union Gap. In August 2008, the U.S. Geological Survey surveyed the areas where data were not available. If possible, the surveys were made with a boat-mounted, single-beam echo sounder attached to a survey-grade Real-Time Kinematic (RTK) global positioning system (GPS). An RTK GPS rover was used on a walking survey of the river banks, shallow river areas, and river bed areas that were impenetrable to the echo sounder because of high densities of macrophytes. After the data were edited, 95,654 bathymetric points from the boat survey with the echo sounder and 1,069 points from the walking survey with the GPS rover were used in the study. The points covered 4.6 kilometers on the Yakima River and 0.6 kilometers on the Naches River. GPS-surveyed points checked within 0.014 to 0.047 meters in the horizontal direction and -0.036 to 0.078 meters in the vertical direction compared to previously established survey control points

  2. Modification of the method of Figgie for determination of joint line shifting in total knee arthroplasty; Modifizierung der Messmethode nach Figgie zur Bestimmung der Gelenklinienverschiebung in der Knieendoprothetik

    Energy Technology Data Exchange (ETDEWEB)

    Classen, T.; Wegner, A.; Knoch, M. von [Universitaet Duisburg-Essen, Klinik fuer Orthopaedie, Essen (Germany)

    2009-06-15

    An important factor for a good result after total knee arthroplasty is the position of the patella in relation to the tibiofemoral joint line. The position of the patella itself is not influenced by arthroplasty, therefore any changes in the position of the tibiofemoral joint line are of special interest. The Figgie method to describe patella height delivers only absolute measurements, which makes it difficult to compare different radiographs. For this reason we developed a new JL/P quotient (JL: distance from the tibial plateau to the tibial tubercle, P: distance from the inferior pole of the patella to the tibial plateau) to enable better comparison. Furthermore, we modified the JL/P quotient and instead of taking the tibial plateau as the reference line, we constructed a tangent on the femoral condyle. With this modification, problems such as tibial inlays of different heights which have to be taken into account in the measurements, the slope of the tibial component or difficult assessment of the tibial joint surface in osteoarthritic knees do not arise. The JL/P quotient shows massive shift to cranialisation of the tibiofemoral joint line which does not correspond to reality. The modified method also shows cranialisation of the tibiofemoral joint line, but in a realistic way. Both methods show a minimal interobserver variability. The modified JL/P quotient seems to be a good method for determining the shift in the tibiofemoral joint line after total knee arthroplasty. (orig.) [German] Ein bedeutender Faktor fuer ein gutes postoperatives Ergebnis nach einer Knieendoprothesenimplantation ist die Stellung der Patella in Relation zur tibiofemoralen Gelenklinie. Da die Stellung der Patella durch den operativen Eingriff primaer nicht beeinflusst wird, liegt besonderes Augenmerk auf den Veraenderungen der Gelenklinie des Tibiofemoralgelenks. Die Messmethode zur Bestimmung der Patellahoehe nach Figgie liefert dafuer nur absolute Werte, was eine Vergleichbarkeit von

  3. Einfluss des Ratings von Unternehmen auf die Rechnungslegung und Abschlussprüfung - Rating als Möglichkeit zur Verbesserung des Informationsgehalts des Lageberichts nach § 289 HGB

    OpenAIRE

    Fiebiger, André

    2006-01-01

    Mit der Einführung von Basel II erhalten ab dem 01. Januar 2007 nahezu alle fremdfinan¬zierten Unterneh¬men im Rahmen einer Ratinga¬nalyse eine individuelle Bewertung ihrer Bo¬nität. Wie die Ratinganalyse haben sich auch die gesetzlichen Vertreter im Rahmen der Lageberichterstattung und der Abschlussprüfer im Rahmen seiner Prüfungs¬pflichten mit der Bestandskraft des zu prüfenden Unternehmens auseinander zu setzen. Es stellt sich insofern die Frage nach dem Einfluss von Ratinganalysen auf die...

  4. Failures in implants

    Directory of Open Access Journals (Sweden)

    E Prashanti

    2011-01-01

    Full Text Available The burning problem that all the implantologists are confronted today is the complications and failures occurring with the treatment of osseointegrated implants. To further optimize the treatment outcome, etiologies and factors associated with implant failures should be elucidated. Conceivably such knowledge is needed for developing adequate treatment and prevention strategies. Hence, this paper is intended to provide an insight regarding various aspects of failures that affect dental implants.

  5. A review: Cochlear implants

    OpenAIRE

    Batman, Ç.; Üneri, C.; Şehitoijlu, M.A.

    1991-01-01

    Electrical stimulation of the auditory system in deaf individuals has been first explained in 1935 by Andreev et al. and in 1940 by Jones et al, resulting in sensation of hearing (1,2). These attempts are facilitated by Djourno et al who first implanted electrical devices in two subjects in 1957 (3). But this type of stimulation has been a controversy until 1974, when cochlear implant was successfully implanted by W.F. House. Since that time over 5000 individuals have been implanted with a va...

  6. Ion implantation technology

    CERN Document Server

    Downey, DF; Jones, KS; Ryding, G

    1993-01-01

    Ion implantation technology has made a major contribution to the dramatic advances in integrated circuit technology since the early 1970's. The ever-present need for accurate models in ion implanted species will become absolutely vital in the future due to shrinking feature sizes. Successful wide application of ion implantation, as well as exploitation of newly identified opportunities, will require the development of comprehensive implant models. The 141 papers (including 24 invited papers) in this volume address the most recent developments in this field. New structures and possible approach

  7. Erziehung nach Auschwitz

    DEFF Research Database (Denmark)

    2017-01-01

    Auschwitz var det barbari, imod hvilket al opdragelse retter sig. Man taler om truende tilbagefald i barbariet. Men det truer ikke – Auschwitz var tilbagefaldet. Barbariet består stadig – så længe de betingelser, som resulterede i tilbagefaldet, varer ved....

  8. Sacherschliessung nach RDA

    Directory of Open Access Journals (Sweden)

    Hans Schürmann

    2015-05-01

    Full Text Available Die Resource Description and Access (RDA wird für den deutschsprachigen Raum das neue Regelwerk für die bibliothekarische Erschliessung der Bestände. In diesem Regelwerk wird auch die Sacherschliessung neu geregelt. Zurzeit sind diese Seiten noch leer. Doch wie soll ein Regelwerk für die Sacherschliessung aussehen? Kriterien für eine Regelung fehlen, zu stark hat sich das Umfeld der Inhaltserschliessung in den letzten Jahren geändert. Auch von der Schlagworttheorie her sind noch keine Hinweise in Sicht. Deshalb wird in verschiedenen Gremien intensiv diskutiert, wie eine zukunftsfähige Sacherschliessung aussehen könnte. In welchem Rahmen bewegt sich die Diskussion und woran soll sich die Regelwerksentwicklung für den Sachkatalog orientieren? Der Beitrag erwägt zwischen der Sachkataloggeschichte einerseits und dem modernen Datenmanagement im Netz andererseits die Bedeutung und die Rolle eines Sacherschliessungsregelwerks. Resource Description and Access (RDA will be the new standard for descriptive cataloguing in the German-speaking countries. Under RDA, subject indexing will also be redefined, although, at present, the relevant pages remain blank. This article ponders the question what these new standards could look like. As yet no clear criteria have emerged – the field of subject indexing has undergone too much change in recent years for that. Nor does the theory appear to offer any answers at the moment. There is therefore intensive and ongoing debate in the various forums. What is the framework of these discussions and what are the key criteria? The article summarizes them and considers the importance of indexing standards in the light of both the history of indexing and modern data management on the web.

  9. Radiation therapy after mastectomy. Interdisciplinary consensus puts an end to a controversy; Strahlentherapie nach Mastektomie. Interdisziplinaerer Konsensus beendet Kontroverse

    Energy Technology Data Exchange (ETDEWEB)

    Sauer, R. [Erlangen-Nuernberg Univ., Erlangen (Germany). Klinik und Poliklinik fuer Strahlentherapie; Schulz, K.D. [Marburg Univ. (Germany). Medizinisches Zentrum fuer Frauenheilkunde und Geburtshilfe; Hellriegel, K.P. [Krankenhaus Berlin-Moabit (DE). 2. Innere Klinik] [and others

    2001-01-01

    . Gesicherte Indikationen zur postoperativen Radiotherapie nach Mastektomie sind: T3/T4-Karzinome, T2-Karzinome mit einer Groesse>3 cm, multizentrisches Tumorwachstum, Lymphangiosis carcinomatosa oder Gefaesseinbrueche, Befall der Pektoralisfaszie oder Sicherheitsabstand<5 mm, R1- oder R2-Resektion, mehr als drei befallene Achsellymphknoten. Als sinnvolle, aber noch nicht in klinischen Studien evaluierte Indikationen gelten: Multifokalitaet, extensive intraduktale Komponente, Rezeptornegativitaet, Malignitaetsgrad G3, diffuse Mikrokalzifikationen, ein bis drei axillaere Lymphknotenmetastasen, Zustand nach mehreren, nicht in sano erfolgten Biopsien, Alter unter 35 Jahre. 4. Eine simultan zur Radiotherapie durchgefuehrte Tamoxifenbehandlung ist entgegen teilweise anderslautenden In-vitro-Daten durchaus sinnvoll, zumal Tamoxifen die Apoptose foerdert. Eine CMF-Therapie wird ueblicherweise im Sandwich-Verfahren durchgefuehrt, kann jedoch in begruendeten(orig.)(abstract truncated)

  10. Mechanical-biological waste conditioning with controlled venting - the Meisenheim mechanical-biological waste conditioning plant; Mechanisch-biologische Restabfallbehandlung nach dem Kaminzugverfahren - MBRA Meisenheim

    Energy Technology Data Exchange (ETDEWEB)

    Hangen, H.O. [Abfallwirtschaftsbetrieb Landkreis Bad Kreuznach, Bad Kreuznach (Germany)

    1998-12-31

    The decision of the rural district of Bad Kreuznach to propose creating facilities for mechanical-biological waste conditioning at the new northern Meisenheim landfill was consistent and correct. It will ensure that the material deposited at this new, state-of-the-art landfill is organically `lean` and can be deposited with a high density. Preliminary sifting of the material prior to depositing safeguards that no improper components are inadvertently included. Three years of operation warrant the statement that waste components that cannot be appropriately biologically conditioned should be eliminated prior to rotting. (orig.) [Deutsch] Die Entscheidung des Landkreises Bad Kreuznach, der neu eingerichteten Norddeponie Meisenheim eine MBRA vorzuschlaten, war auf jeden Fall konsequent und richtig. Es ist damit sicher gestellt, dass in diesem neuen nach dem Stand der Technik eingerichteten Deponiebereich von Anfang an ein Material eingelagert wird, das `organisch abgemagert` ist und mit hoher Einbaudichte eingebaut werden kann. Die Sichtung des gesamten Deponie-Inputs in der Vorsortierhalle gibt ein Stueck Sicherheit, dass keine nicht zugelassenen Stoffe verdeckt dem Ablagerungsbereich der Deponie zugefuehrt werden. Nach mehr als 3 Jahren Betriebszeit kann festgestellt werden, dass biologisch nicht sinnvoll behandelbare Abfallbestandteile vor dem Rotteprozess abgetrennt werden sollten. (orig.)

  11. The α7-nACh nicotinic receptor and its role in memory and selected diseases of the central nervous system

    Directory of Open Access Journals (Sweden)

    Urszula Baranowska

    2017-07-01

    Full Text Available α7-nACh is one of the major nicotinic cholinergic receptor subtypes found in the brain. It is broadly expressed in the hippocampal and cortical neurons, the regions which play a key role in memory formation. Although α7-nACh receptors may serve as postsynaptic receptors mediating classical neurotransmission, they usually function as presynaptic modulators responsible for the release of other neurotransmitters, such as glutamate, γ-aminobutyric acid, dopamine, and norepinephrine. They can, therefore, affect a wide array of neurobiological functions. In recent years, research has found that a large number of agonists and positive allosteric modulators of α7-nAChR induce beneficial effects on learning and memory. Consistently, mice deficient in chrna7 (the gene encoding α7-nAChR protein, are characterized by memory deficits. In addition, decreased expression and function of α7-nAChR is associated agoniwith many neurological diseases including schizophrenia, bipolar disorder, learning disability, attention deficit hyperactivity disorder, Alzheimer disease, autism, and epilepsy. In the recent years many animal experiments and clinical trials using α7-nAChR ligands were conducted. The results of these studies strongly indicate that agonists and positive allosteric modulators of α7-nAChR are promising therapeutic agents for diseases associated with cognitive deficits.

  12. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne

    2012-01-01

    We evaluated the association between radiation therapy and severe capsular contracture or reoperation after 717 delayed breast implant reconstruction procedures (288 1- and 429 2-stage procedures) identified in the prospective database of the Danish Registry for Plastic Surgery of the Breast during...... reconstruction approaches other than implants should be seriously considered among women who have received radiation therapy....

  13. HA-Coated Implant

    DEFF Research Database (Denmark)

    Daugaard, Henrik; Søballe, Kjeld; Bechtold, Joan E

    2014-01-01

    The goal of osseointegration of orthopedic and dental implants is the rapid achievement of a mechanically stable and long lasting fixation between living bone and the implant surface. In total joint replacements of cementless designs, coatings of calcium phosphates were introduced as a means...

  14. Implantable CMOS Biomedical Devices

    Directory of Open Access Journals (Sweden)

    Toshihiko Noda

    2009-11-01

    Full Text Available The results of recent research on our implantable CMOS biomedical devices are reviewed. Topics include retinal prosthesis devices and deep-brain implantation devices for small animals. Fundamental device structures and characteristics as well as in vivo experiments are presented.

  15. Intracoronary radiation for the prevention of restenosis following PTCA; Intrakoronare Bestrahlung zur Verhinderung einer Restenose nach PTCA

    Energy Technology Data Exchange (ETDEWEB)

    Silber, S. [Kardiologische Praxis in der Klinik Dr. Mueller, Muenchen (Germany)

    2001-12-01

    . Behandlung einer nach Ballondehnung von Koronarstenosen in ca. 30% auftretenden Restenose durch intravaskulaere Bestrahlung beruht auf der jeder Strahlentherapie inhaerenten Proliferationshemmung. Insgesamt liegen 12 plazebokontrollierte, randomisierte Studien vor: 7 bei In-Stent-Restenose, 2 bei De-novo-Stenosen (oder Restenosen ohne Stent) als striktes Einschlusskriterium und 3 mit allen Stenosearten. In diesen 12 Studien wurden 1676 Patienten den Plazebogruppen und 1794 den Therapiegruppen zugeordnet. Bei den In-Stent-Restenosen lag die Gefaessgroesse als Einschlusskriterium zwischen 2,4 mm und 5,5 mm, die Stenosenlaenge zwischen < 20 mm und {<=} 80 mm. In allen Studien mit In-Stent-Restenosen wurden die primaeren Endpunkte erreicht, die Restenoseraten im laengsten analysierten Koronarsegment lagen in den Kontrollgruppen zwischen 45% und 68,8% und in den Brachytherapiegruppen zwischen 21% und 53,5%. Die entsprechenden Werte fuer die TVR lagen in den Kontrollgruppen zwischen 24,1% und 67,6%, in den Brachytherapiegruppen zwischen 16% und 41,7%. MACE in den Kontrollgruppen lag zwischen 25,9% und 67,6%, in den Brachytherapiegruppen zwischen 18% und 41,7%. Bei De-novo-Stenosen waren die Ergebnisse problematisch, da das 'geographic miss' hier eine groessere Rolle zu spielen scheint. Unter Beruecksichtigung dieser Tatsache liessen sich jedoch auch bei De-novo-Stenosen gute Resultate erzielen. Die bekannten Limitationen durch spaete Stentthrombosen (in aelteren Studien 4-15%) und durch Randeffekte konnten durch eine einjaehrige Clopidogrelgabe bzw. die Verwendung laengerer Strahlenquellen weitgehend beseitigt werden. Bei De-novo-Stenosen ist in Anbetracht der antiproliferativ beschichteten Stents jetzt nicht mehr mit einer wichtigen Rolle der intrakoronaren Brachytherapie zu rechnen. Im Gegensatz hierzu stellt die intrakoronare Brachytherapie bei In-Stent-Restenose die einzige evidenzbasierte interventionelle Therapieform dar. (orig.)

  16. Dental Implant Systems

    Science.gov (United States)

    Oshida, Yoshiki; Tuna, Elif B.; Aktören, Oya; Gençay, Koray

    2010-01-01

    Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with vital hard/soft tissue and is subjected to chemical as well as mechanical bio-environments. Such requirements should, at least, include biological compatibility, mechanical compatibility, and morphological compatibility to surrounding vital tissues. In this review, based on carefully selected about 500 published articles, these requirements plus MRI compatibility are firstly reviewed, followed by surface texturing methods in details. Normally dental implants are placed to lost tooth/teeth location(s) in adult patients whose skeleton and bony growth have already completed. However, there are some controversial issues for placing dental implants in growing patients. This point has been, in most of dental articles, overlooked. This review, therefore, throws a deliberate sight on this point. Concluding this review, we are proposing a novel implant system that integrates materials science and up-dated surface technology to improve dental implant systems exhibiting bio- and mechano-functionalities. PMID:20480036

  17. Implants in the hand; Implantate der Hand

    Energy Technology Data Exchange (ETDEWEB)

    Wanivenhaus, A. [Medizinische Universitaet, Universitaetsklinik fuer Orthopaedie, Wien (Austria)

    2006-09-15

    Increasingly, implants in the region of hand joints and the wrist represent an alternative for the treatment of post-traumatic, inflamed, or degenerative joint damage. The diversity of hand functions also results in varied solutions, which are effective in their stability, mobility, and distraction. Different materials are necessary for this, and they require subtile radiological control. The native X-ray represents the substantial method to observe migration of the implants. Each interface between titanium, ceramic, zirconium, pyrocarbon, and silicon to the bone has to be assessed differently in order to obtain a relevant statement. The finger joints and to a limited extent the wrist represent the artificial joints with limited alternative therapy. Other implants in the hand should only be applied after strict indication and patient compliance, as arthrodesis and resection arthroplasty have shown very good long-term results. (orig.) [German] Implantate im Bereich der Gelenke der Hand und des Handgelenks stellen zunehmend Alternativen bei der Versorgung posttraumatischer, entzuendlicher oder degenerativer Gelenkschaeden dar. Die Vielfalt der Handfunktionen fuehrt auch zu unterschiedlichen Loesungen, die durch Stabilitaet, Mobilitaet und Distraktion wirksam werden. Dafuer sind unterschiedliche Materialien erforderlich, die eine subtile radiologische Kontrolle erfordern. Das Nativroentgen stellt das wesentlichste Verfahren zur Verlaufsbeobachtung von Implantaten dar. Das Interface zwischen Titan, Keramik, Zirkonium, Pyrokarbon und Silikon zum Knochen muss unterschiedlich bewertet werden, um relevante Aussagen treffen zu koennen. Die Fingergelenke und in begrenztem Ausmass auch das Handgelenk stellen Kunstgelenke mit geringen Alternativtherapiemoeglichkeiten dar. Die uebrigen Implantate der Hand sollten nur bei strenger Indikationsstellung und hoher Patientencompliance Anwendung finden, da Arthrodese oder Resektionsarthroplastik gute Langzeitresultate aufweisen. (orig.)

  18. Smoking and dental implants

    OpenAIRE

    Kasat, V.; Ladda, R

    2012-01-01

    Smoking is a prevalent behaviour in the population. The aim of this review is to bring to light the effects of smoking on dental implants. These facts will assist dental professionals when implants are planned in tobacco users. A search of “PubMed” was made with the key words “dental implant,” “nicotine,” “smoking,” “tobacco,” and “osseointegration.” Also, publications on tobacco control by the Government of India were considered. For review, only those articles published from 1988 onward in ...

  19. Optimization of dental implantation

    Science.gov (United States)

    Dol, Aleksandr V.; Ivanov, Dmitriy V.

    2017-02-01

    Modern dentistry can not exist without dental implantation. This work is devoted to study of the "bone-implant" system and to optimization of dental prostheses installation. Modern non-invasive methods such as MRI an 3D-scanning as well as numerical calculations and 3D-prototyping allow to optimize all of stages of dental prosthetics. An integrated approach to the planning of implant surgery can significantly reduce the risk of complications in the first few days after treatment, and throughout the period of operation of the prosthesis.

  20. Functional MRI of the pelvic floor: postpartum changes of primiparous women after spontaneous vaginal delivery; Funktionelle Magnetresonanztomographie (MRT) des Beckenbodens: Postpartale Veraenderungen bei Erstgebaerenden nach vaginaler Spontangeburt

    Energy Technology Data Exchange (ETDEWEB)

    Lienemann, A.; Fischer, T.; Reiser, M. [Inst. fuer Klinische Radiologie, Klinikum der Univ. Muenchen (Germany); Anthuber, C. [Klinik und Poliklinik fuer Geburtshilfe und Frauenheilkunde, Klinikum der Univ. Muenchen/Grosshadern (Germany)

    2003-08-01

    Purpose: Detection of morphological and functional changes of the pelvic floor with functional MRI in primiparous women after spontaneous vaginal delivery. Methods and Materials: The study comprises 26 primiparous women after vaginal delivery and a control group of 41 healthy asymptomatic nulliparous volunteers. MRI was performed on a 1.5 T system in supine position with vagina and rectum opacified with Sonogel. The static images consisted of sagittal and axial T{sub 2}-weighted SE sequences and functional images of true FISP sequences in midsagittal and axial planes acquired with the patient at rest, straining and during defecation. Evaluation of morphometric parameters included pelvimetry, thickness of the puborectal muscle and width of the urogenital hiatus as well as position and movement of the pelvic organs relative to the pubococcygeal reference line. Results: The configuration of the bony pelvis did not differ for both groups. The puborectal muscle was significantly thinner in the study group (0.8 cm vs 0.6 cm). The functional images showed no significant differences between both groups at rest but a significantly increased incidence in the descent of the bladder neck, vaginal fornix and anorectal junction in the study group during straining. In addition, the primiparous women had more prominent rectoceles (0.6 cm vs 1.5 cm). Conclusion: Static imaging alone fails to demonstrate relevant pelvic floor changes and a functional method is necessary to evaluate the interactions of the pelvic organs regarding organ descent. Functional MRI of the pelvic floor is an excellent method to reveal the significant changes of the pelvic floor after vaginal birth without exposing the uterus to radiation. (orig.) [German] Ziel: Darstellung von morphologischen und funktionellen Veraenderungen am Beckenboden bei Erstgebaerenden nach spontanvaginaler Entbindung mittels funktioneller MRT. Methodik: Funktionelle MRT des Beckenbodens von 26 Erstgebaerenden nach vaginaler

  1. The value of ultrasound and MRI following surgical treatment of repture of the achilles tendon; Der Wert von Ultraschall und Magnetresonanztomographie in der postoperativen Verlaufskontrolle nach Achillessehnenruptur

    Energy Technology Data Exchange (ETDEWEB)

    Rominger, M.B.; Bachmann, G. [Giessen Univ. (Germany). Abt. fuer Diagnostische Radiologie; Schulte, S.; Zedler, A. [Giessen Univ. (Germany). Orthopaedische Klinik

    1998-01-01

    Aim: A comparison of clinical examination, sonography and MRI in the follow-up of suture of the Achilles tendon. Method: 60 patients were examined in a prospective study for 6-78 months following suture of the Achilles tendon repair; both sides were compared clinically and sonographically; in 30 patients MRI was also used. Morphometric measurements (antero-posterior and transverse measurements) and changes in morphological structure were correlated with clinical results. Results: All patients showed thickening of the Achilles tendon postoperatively. Morphometric and morphological changes showed positive and significant correlation between sonography and MRI (p=<0.001, p=0.004). Structural changes in sonography had positive correlation with general symptoms (p=<0.001), pain on movement (p=<0.001), reduced function (p=0.005), and reduced sporting activity (p=0.034). MRI findings showed significant regression with time (p=0.05). Conclusion: Following repair, the Achilles tendon remained thickened throughout the period of observation. Post-operative changes in the structure of the tendon regressed partially. Sonography and MRI correlate significantly with the clinical findings. Sonography is the imaging method of choice, MRI is an additional procedure. (orig.) [Deutsch] Ziel: Vergleich von Klinik, Sonographie und MRT in der Verlaufsbeobachtung nach Achillessehnennaht. Methodik: In einer prospektiven Untersuchung wurden 60 Patienten im Seitenvergleich 6-78 Monate nach Achillessehnennaht klinisch, sonographisch und 30 Patienten magnetresonanztomographisch nachuntersucht. Morphometrische (anterior-posteriorer (a.-p.) und Querdurchmesser) und morphologische Strukturveraenderungen wurden mit den klinischen Ergebnissen korreliert. Ergebnisse: Alle Patienten (n=60) wiesen postoperativ eine verdickte Achillessehne auf. Morphometrische und morphologische Veraenderungen in Sonographie und MRT korrelierten positiv signifikant (p=<0,001, p=0,004). Sonographische

  2. DEALING WITH DENTAL IMPLANT FAILURES

    Science.gov (United States)

    Levin, Liran

    2008-01-01

    An implant-supported restoration offers a predictable treatment for tooth replacement. Reported success rates for dental implants are high. Nevertheless, failures that mandate immediate implant removal do occur. The consequences of implant removal jeopardize the clinician's efforts to accomplish satisfactory function and esthetics. For the patient, this usually involves further cost and additional procedures. The aim of this paper is to describe different methods and treatment modalities to deal with dental implant failure. The main topics for discussion include identifying the failing implant, implants replacing failed implants at the exact site, and the use of other restorative options. When an implant fails, a tailor made treatment plan should be provided to each patient according to all relevant variables. Patients should be informed regarding all possible treatment modalities following implant failure and give their consent to the most appropriate treatment option for them. PMID:19089213

  3. Dealing with dental implant failures

    Directory of Open Access Journals (Sweden)

    Liran Levin

    2008-06-01

    Full Text Available An implant-supported restoration offers a predictable treatment for tooth replacement. Reported success rates for dental implants are high. Nevertheless, failures that mandate immediate implant removal do occur. The consequences of implant removal jeopardize the clinician's efforts to accomplish satisfactory function and esthetics. For the patient, this usually involves further cost and additional procedures. The aim of this paper is to describe different methods and treatment modalities to deal with dental implant failure. The main topics for discussion include identifying the failing implant, implants replacing failed implants at the exact site, and the use of other restorative options.When an implant fails, a tailor made treatment plan should be provided to each patient according to all relevant variables. Patients should be informed regarding all possible treatment modalities following implant failure and give their consent to the most appropriate treatment option for them.

  4. Risks of Breast Implants

    Science.gov (United States)

    ... Tissue Disease The FDA has not detected any association between silicone gel-filled breast implants and connective tissue disease, breast cancer, or reproductive problems. In order to rule out ...

  5. Superelastic Orthopedic Implant Coatings

    Science.gov (United States)

    Fournier, Eric; Devaney, Robert; Palmer, Matthew; Kramer, Joshua; El Khaja, Ragheb; Fonte, Matthew

    2014-07-01

    The demand for hip and knee replacement surgery is substantial and growing. Unfortunately, most joint replacement surgeries will fail within 10-25 years, thereby requiring an arduous, painful, and expensive revision surgery. To address this issue, a novel orthopedic implant coating material ("eXalt") has been developed. eXalt is comprised of super elastic nitinol wire that is knit into a three-dimensional spacer fabric structure. eXalt expands in vivo to conform to the implantation site and is porous to allow for bone ingrowth. The safety and efficacy of eXalt were evaluated through structural analysis, mechanical testing, and a rabbit implantation model. The results demonstrate that eXalt meets or exceeds the performance of current coating technologies with reduced micromotion, improved osseointegration, and stronger implant fixation in vivo.

  6. Implantable Cardioverter Defibrillator

    Science.gov (United States)

    ... for example, iPods) Household appliances, such as microwave ovens High-tension wires Metal detectors Industrial welders Electrical ... of Having an Implantable Cardioverter Defibrillator? An ICD works well at detecting and stopping certain life-threatening ...

  7. Ion Implantation of Polymers

    DEFF Research Database (Denmark)

    Popok, Vladimir

    2012-01-01

    The current paper presents a state-of-the-art review in the field of ion implantation of polymers. Numerous published studies of polymers modified by ion beams are analysed. General aspects of ion stopping, latent track formation and changes of structure and composition of organic materials...... are discussed. Related to that, the effects of radiothermolysis, degassing and carbonisation are considered. Specificity of depth distributions of implanted into polymers impurities is analysed and the case of high-fluence implantation is emphasised. Within rather broad topic of ion bombardment, the focus...... is put on the low-energy implantation of metal ions causing the nucleation and growth of nanoparticles in the shallow polymer layers. Electrical, optical and magnetic properties of metal/polymer composites are under the discussion and the approaches towards practical applications are overviewed....

  8. [Osteoradionecrosis and dental implants].

    Science.gov (United States)

    Ben Slama, L; Hasni, W; De Labrouhe, C; Bado, F; Bertrand, J-C

    2008-12-01

    Osteoradionecrosis (ORN) is a severe complication of radiation therapy (RT). A triggering factor is frequently present. It is often a dental, periodental, or surgical traumatism. We report the case of a bilateral ORN: the first lesion appeared 3months after the end of RT around the osteosynthesis plate and was treated by mandibular resection. The second lesion appeared 40months after RT on the opposite side, due to peri-implantitis. Dental implants had been inserted 10years before cancer therapy. No case of ORN in post-implantation RT had been previously reported. A 75-year-old woman was admitted for a squamous cell carcinoma of the right cheek extending to the intermaxillary commissure, the maxillary tuberosity, the soft palate, the lingual junction, and the vestibule up to the second premolar area. There was no suspicious lymph node. She had undergone dental implant procedure 15 and 10 years before, respectively, one in the second premolar position of the right maxilla and four in the premolar and molar left mandible area. All of them were osseo-integrated and charged. A trans-mandibular buccopharyngectomy with modified radical neck dissection was performed, completed by RT. The total dose of irradiation was 65Gy in the oral cavity and 45Gy on cervical and supraclavicular areas. Delayed mucosal healing was observed on the right mandible and ORN appeared in this area 3months after the end of irradiation. Mandibular resection was necessary. Later, the right maxillary implant was lost, and multiple dental extractions were required. Forty months after RT, peri-implantitis was observed on the left side of the mandible, complicated by ORN and pathological fracture. No surgical reconstruction could be performed because of the patient's age and state. The patient was carrying a complete removable maxillary prosthesis on latest follow-up. This was the first case of ORN on dental implants placed before RT. RT is a risk factor of implant failure, a relatively rare and

  9. Analgesia in implant dentistry.

    Science.gov (United States)

    Garg, Arun

    2011-06-01

    This month's feature article offers a review of analgesics commonly used in implant dentistry. While the placement of an implant is certainly of the utmost importance to the practitioner, ensuring adequate pain control during and after the procedure is one of the more important aspects to the patient. Selecting the most effective and appropriate agent to control swelling, pain, and anxiety requires a broad knowledge of these classes of medication.

  10. Biomaterials in cochlear implants

    OpenAIRE

    Lenarz, Thomas; Stöver, Timo

    2011-01-01

    The cochlear implant (CI) represents, for almost 25 years now, the gold standard in the treatment of children born deaf and for postlingually deafened adults. These devices thus constitute the greatest success story in the field of ‘neurobionic’ prostheses. Their (now routine) fitting in adults, and especially in young children and even babies, places exacting demands on these implants, particularly with regard to the biocompatibility of a CI’s surface components. Furthermore, certain parts o...

  11. Veno-occlusive liver disease after infradiaphragmatic total lymphoid irradiation. A rare complication; Die Venenverschlusskrankheit der Leber nach infradiaphragmaler total lymphatischer Bestrahlung. Eine seltene Nebenwirkung

    Energy Technology Data Exchange (ETDEWEB)

    Bischof, M.; Zierhut, D.; Gutwein, S.; Wannenmacher, M. [Heidelberg Univ. (DE.) Abt. fuer Klinische Radiologie - Schwerpunkt Strahlentherapie; Hansmann, J. [Heidelberg Univ. (DE.) Abt. fuer Radiologische Diagnostik; Stremmel, W.; Mueller, M. [Heidelberg Univ. (DE). Abt. Innere Medizin 4 (Schwerpunkt Gastroenterologie)

    2001-06-01

    -jaehrigen Patienten mit einem zentrozytisch-zentroblastischen Non-Hodgkin-Lymphom, Stadium IA (Lokalisation: Linke Leiste) wurde die gesamte Abdomen- und Beckenregion ('abdominelles Bad') bestrahlt. Bei einer woechentlichen Fraktionierung von fuenfmal 1,5 Gy wurde eine Gesamtdosis von 30 Gy appliziert. Zum Schutz der Risikoorgane wurden Nierenbloecke nach 13,5 Gy und Leberbloecke nach 25 Gy eingesetzt. Waehrend der letzten beiden Therapietage kam es zur Verschlechterung des Allgemeinzustandes des Patienten mit Gewichtszunahme, Vergroesserung des Bauchumfanges, Dyspnoe und einem Anstieg der Leberwerte. Die weiterfuehrende Diagnostik ergab eine Hepatosplenomegalie mit ausgepraegter Aszitesbildung und einen erhoehten portosystemischen Druckgradienten. Im Leberbiopsat wurde eine Venenverschlusskrankheit gefunden. Innerhalb 1 Woche nach Anlage eines transjungulaeren intrahepatischen portosystemischen Stent-Shunts (TIPSS), Vollheparinisierung und unter Diuretikagabe war der Patient beschwerdefrei. Die Leberwerte sind im Normbereich. Schlussfolgerung: Die Venenverschlusskrankheit der Leber (VOD) ist eine sehr seltene Nebenwirkung bei der abdominellen Bestrahlung nicht vorbehandelter follikulaerer Keimzentrumslymphome. Bei Oberbauchbeschwerden, Anstieg der Leberenzyme sowie Aszitesbildung, insbesondere in einem Zeitraum von bis zu 4 Monaten nach Therapieabschluss, muss an diese Komplikation gedacht werden. Genese, Diagnostik und Therapie der Venenverschlusskrankheit der Leber werden im Literaturueberblick praesentiert. (orig.)

  12. Ion implantation. L'implantation ionique

    Energy Technology Data Exchange (ETDEWEB)

    Tousset, J. (Lyon-1 Univ., 69 - Villeurbanne (FR). Inst. de Physique Nucleaire)

    1989-10-01

    The ion implantation technique which has been used in the semiconductor industry for more than 20 years, is now gradually becoming adopted as a surface treatment process for various materials, particularly metals and ceramics. The aim is to improve wear, fatigue and or corrosion resistance. Its characteristic features are the absence of an interface between the modified surface layer and the substrate, and the conservation of the initial component dimensions and volume, since the process does not involve heating. Another characteristic concerns the nature of the chemical species created in the treated zone, whose formation does not necessarily correspond to thermodynamic equilibrum, and which can be amorphous or metastable. In its simple form, the technique is limited due to the low thickness affected. This paper definies the basic principles of the technique, the methods used for characterising the implanted zone, and the present and potential fields of application. 13 refs.

  13. Contraceptive implants: current perspectives

    Directory of Open Access Journals (Sweden)

    Rowlands S

    2014-09-01

    Full Text Available Sam Rowlands,1,2 Stephen Searle3 1Centre of Postgraduate Medical Research and Education, School of Health and Social Care, Bournemouth University, Bournemouth, United Kingdom; 2Dorset HealthCare, Bournemouth, United Kingdom; 3Sexual Health Services, Chesterfield, United KingdomAbstract: Progestin-only contraceptive implants are a highly cost-effective form of long-acting reversible contraception. They are the most effective reversible contraceptives and are of a similar effectiveness to sterilization. Pregnancies are rare in women using this method of contraception, and those that do occur must be fully investigated, with an ultrasound scan of the arm and serum etonogestrel level if the implant cannot be located. There are very few contraindications to use of implants, and they have an excellent safety profile. Both acceptability and continuation with the method are high. Noncontraceptive benefits include improvements in dysmenorrhea, ovulatory pain, and endometriosis. Problematic bleeding is a relatively common adverse effect that must be covered in preinsertion information-giving and supported adequately if it occurs. Recognized training for both insertion and removal should be undertaken. Care needs to be taken at both insertion and removal to avoid neurovascular injury. Implants should always be palpable; if they are not, noninsertion should be assumed until disproven. Etonogestrel implants are now radiopaque, which aids localization. Anticipated difficult removals should be performed by specially trained experts. Keywords: contraceptive, subdermal implant, etonogestrel, levonorgestrel, progestin-only, long-acting reversible contraception

  14. Biomaterials in cochlear implants

    Science.gov (United States)

    Stöver, Timo; Lenarz, Thomas

    2011-01-01

    The cochlear implant (CI) represents, for almost 25 years now, the gold standard in the treatment of children born deaf and for postlingually deafened adults. These devices thus constitute the greatest success story in the field of ‘neurobionic’ prostheses. Their (now routine) fitting in adults, and especially in young children and even babies, places exacting demands on these implants, particularly with regard to the biocompatibility of a CI’s surface components. Furthermore, certain parts of the implant face considerable mechanical challenges, such as the need for the electrode array to be flexible and resistant to breakage, and for the implant casing to be able to withstand external forces. As these implants are in the immediate vicinity of the middle-ear mucosa and of the junction to the perilymph of the cochlea, the risk exists – at least in principle – that bacteria may spread along the electrode array into the cochlea. The wide-ranging requirements made of the CI in terms of biocompatibility and the electrode mechanism mean that there is still further scope – despite the fact that CIs are already technically highly sophisticated – for ongoing improvements to the properties of these implants and their constituent materials, thus enhancing the effectiveness of these devices. This paper will therefore discuss fundamental material aspects of CIs as well as the potential for their future development. PMID:22073103

  15. Short dental implants: an emerging concept in implant treatment.

    Science.gov (United States)

    Al-Hashedi, Ashwaq Ali; Taiyeb Ali, Tara Bai; Yunus, Norsiah

    2014-06-01

    Short implants have been advocated as a treatment option in many clinical situations where the use of conventional implants is limited. This review outlines the effectiveness and clinical outcomes of using short implants as a valid treatment option in the rehabilitation of edentulous atrophic alveolar ridges. Initially, an electronic search was performed on the following databases: Medline, PubMed, Embase, Cochrane Database of Systematic Reviews, and DARE using key words from January 1990 until May 2012. An additional hand search was included for the relevant articles in the following journals: International Journal of Oral and Maxillofacial Implants, Clinical Oral Implants Research, Journal of Clinical Periodontology, International Journal of Periodontics, Journal of Periodontology, and Clinical Implant Dentistry and Related Research. Any relevant papers from the journals' references were hand searched. Articles were included if they provided detailed data on implant length, reported survival rates, mentioned measures for implant failure, were in the English language, involved human subjects, and researched implants inserted in healed atrophic ridges with a follow-up period of at least 1 year after implant-prosthesis loading. Short implants demonstrated a high rate of success in the replacement of missing teeth in especially atrophic alveolar ridges. The advanced technology and improvement of the implant surfaces have encouraged the success of short implants to a comparable level to that of standard implants. However, further randomized controlled clinical trials and prospective studies with longer follow-up periods are needed.

  16. Corrosion on spinal implants.

    Science.gov (United States)

    Kirkpatrick, John S; Venugopalan, Ramakrishna; Beck, Preston; Lemons, Jack

    2005-06-01

    Modular spine implants are used as an aid to obtaining fusion, but fretting and corrosion occur between modular components in a biologic environment. Forty-eight spinal implant constructs manufactured by a variety of companies were retrieved from 47 patients and were subjected to surface analysis stereomicroscopy. Stainless-steel implants (n = 23) had either semirigid constructs with mild or no surface alteration (n = 7) or rigid constructs with moderate or severe alteration (n = 16). Surface damage was consistent with previously observed mechanically assisted crevice corrosion phenomena. Titanium alloy implants (n = 25) showed no significant corrosion but had three constructs with fatigue failure of anchoring screws. One cobalt alloy construct showed no evidence of corrosion. Long-term effects of fretting and corrosion are unclear, and minimization of these phenomena seems justified. Selection of modular components with similar materials and surface finish may help the surgeon minimize localized changes over time. Stainless-steel implants with rigid interconnections and those with different surface finishes between rods and connectors are most susceptible to corrosion.

  17. Interface Biology of Implants

    Science.gov (United States)

    Nebe, Barbara

    2009-01-01

    Implants are widely used in various clinical disciplines to replace or stabilize organs. The challenge for the future is to apply implant materials to specifically control the biology of the surrounding tissue for repair and regeneration. This field of research is highly interdisciplinary and combines scientists from technical and life sciences disciplines. To successfully apply materials for regenerative processes in the body, the understanding of the mechanisms at the interface between cells or tissues and the artificial material is of critical importance. The research focuses on stem cells, design of material surfaces, and mechanisms of cell adhesion. For the third time around 200 scientists met in Rostock, Germany for the international symposium “Interface Biology of Implants.” The aim of the symposium is to promote the interdisciplinary dialogue between the scientists from the different disciplines to develop smart implants for medical use. In addition, researchers from basic sciences, notably cell biology presented new findings concerning mechanisms of cell adhesion to stimulate research in the applied field of implant technology. PMID:19690468

  18. Psychological intervention following implantation of an implantable defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; van den Broek, Krista C; Sears, Samuel F

    2007-01-01

    The medical benefits of the implantable cardioverter defibrillator (ICD) are unequivocal, but a subgroup of patients experiences emotional difficulties following implantation. For this subgroup, some form of psychological intervention may be warranted. This review provides an overview of current...

  19. Management of peri-implantitis

    Science.gov (United States)

    Prathapachandran, Jayachandran; Suresh, Neethu

    2012-01-01

    Peri-implantitis is a site-specific infectious disease that causes an inflammatory process in soft tissues, and bone loss around an osseointegrated implant in function. The etiology of the implant infection is conditioned by the status of the tissue surrounding the implant, implant design, degree of roughness, external morphology, and excessive mechanical load. The microorganisms most commonly associated with implant failure are spirochetes and mobile forms of Gram-negative anaerobes, unless the origin is the result of simple mechanical overload. Diagnosis is based on changes of color in the gingiva, bleeding and probing depth of peri-implant pockets, suppuration, X-ray, and gradual loss of bone height around the tooth. Treatment will differ depending upon whether it is a case of peri-implant mucositis or peri-implantitis. The management of implant infection should be focused on the control of infection, the detoxification of the implant surface, and regeneration of the alveolar bone. This review article deals with the various treatment options in the management of peri-implantitis. The article also gives a brief description of the etiopathogenesis, clinical features, and diagnosis of peri-implantitis. PMID:23559913

  20. Management of peri-implantitis

    Directory of Open Access Journals (Sweden)

    Jayachandran Prathapachandran

    2012-01-01

    Full Text Available Peri-implantitis is a site-specific infectious disease that causes an inflammatory process in soft tissues, and bone loss around an osseointegrated implant in function. The etiology of the implant infection is conditioned by the status of the tissue surrounding the implant, implant design, degree of roughness, external morphology, and excessive mechanical load. The microorganisms most commonly associated with implant failure are spirochetes and mobile forms of Gram-negative anaerobes, unless the origin is the result of simple mechanical overload. Diagnosis is based on changes of color in the gingiva, bleeding and probing depth of peri-implant pockets, suppuration, X-ray, and gradual loss of bone height around the tooth. Treatment will differ depending upon whether it is a case of peri-implant mucositis or peri-implantitis. The management of implant infection should be focused on the control of infection, the detoxification of the implant surface, and regeneration of the alveolar bone. This review article deals with the various treatment options in the management of peri-implantitis. The article also gives a brief description of the etiopathogenesis, clinical features, and diagnosis of peri-implantitis.

  1. Implant therapy in irradiated patients.

    Science.gov (United States)

    Sammartino, Gilberto; Marenzi, Gaetano; Cioffi, Iacopo; Teté, Stefano; Mortellaro, Carmen

    2011-03-01

    In this multicenter study, submerged implants were prospectively followed to evaluate their long-term prognosis in irradiated patients. In a total of 77 patients treated for oral or neck cancer, 188 implants were consecutively placed. After a healing period, the successfully integrated implants were restored with 69 removable and 38 fixed restorations. The implants cumulative survival and success rates were evaluated over a period of at least 36 months. In addition, cumulative success rates were calculated for implant subgroups divided per implant site (mandible or maxilla), radiation dosage, and the time interval between the last irradiation and implant placement. During the healing period, 20 implants did not successfully integrate, whereas 168 implants were classified as success (including both survival and success rates). The analysis of implant subgroups showed slightly more favorable cumulative success rate for mandibular implants (98.4%) compared with maxillary implants (57.1%) and clearly better success rate for a radiation dosage minor of 50-Gy doses. A time greater than 12 months as interval between last irradiation and implant placement seems not to promote better clinical results.

  2. A pictorial essay of breast implant imaging and implant complications.

    Science.gov (United States)

    Arslan, Gozde; Celik, Levent; Cubuk, Rahmi

    2016-01-01

    Nowadays as more breast conserving surgeries and mastectomies are being performed, more breast implants are being used. Follow-up of these patients is as important as treatment. We, radiologists should be aware of normal imaging appearance of implants during follow ups. We should also be aware of complications which we may encounter during controls. In our essay, we aim to show the normal and pathological appearence of implants by sharing ultrasound, mammography and MR images from our clinic. Breast, Implants, MRI, Rupture.

  3. Early loss of teeth after treatment for childhood leukemia; Fruehzeitiger Zahnverlust nach Leukaemiebehandlung im Kindesalter. Fallbericht und Literaturuebersicht

    Energy Technology Data Exchange (ETDEWEB)

    Herrmann, T.; Doerr, W.; Lesche, A.; Lehmann, D. [Klinik und Poliklinik fuer Strahlentherapie und Radioonkologie, Medizinische Fakultaet der Technischen Univ. Dresden (Germany); Koy, S. [Klinik und Poliklinik fuer Mund-, Kiefer- und Gesichtschirurgie, Medizinische Fakultaet der Technischen Univ. Dresden (Germany)

    2004-06-01

    Background: only few reports of effects of radiotherapy in childhood on the dental apparatus are available in the literature. The basis for early loss of teeth appears to be a reduction of the root surface area after radiation exposure. These effects in the periodontium are a consequence of combined radiochemotherapy usually applied for treatment of childhood neoplasia. Chemotherapy alone also results in changes of periodontal development. Case report: a 33-year-old patient is reported, who, at the age of 11 years, received high-dose chemotherapy and radiotherapy of neuroaxis and cranium for acute lymphatic leukemia with relapse. The patient consulted the Implant Section of the Department of Oral and Maxillofacial Surgery because of severe dental changes and tooth loss despite adequate dental care and oral hygiene. Radiation doses given to the superior maxilla and mandible at the age of 11 were estimated to be in the range of 8-25 Gy. Conclusion: intense, life-long dental care and follow-up of patients cured from malignant disease in childhood must hence be postulated in order to minimize dental treatment sequelae by supportive measures, but also to initiate timely adequate dental and prosthetic management. (orig.)

  4. Silicone Gel-Filled Breast Implants

    Science.gov (United States)

    ... Medical Procedures Implants and Prosthetics Breast Implants Silicone Gel-Filled Breast Implants Share Tweet Linkedin Pin it ... options Linkedin Pin it Email Print Description: Silicone gel-filled breast implants have a silicone outer shell ...

  5. Dental implants: A review.

    Science.gov (United States)

    Guillaume, B

    2016-12-01

    A high number of patients have one or more missing tooth and it is estimated that one in four American subjects over the age of 74 have lost all their natural teeth. Many options exist to replace missing teeth but dental implants have become one of the most used biomaterial to replace one (or more) missing tooth over the last decades. Contemporary dental implants made with titanium have been proven safe and effective in large series of patients. This review considers the main historical facts concerned with dental implants and present the different critical factors that will ensure a good osseo-integration that will ensure a stable prosthesis anchorage. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  6. Optimization of dental implant treatment

    National Research Council Canada - National Science Library

    Dmitriy V. Ivanov; Aleksandr V. Dol; Dmitriy A. Smirnov

    2016-01-01

    Aim ― Modern dentistry cannot exist without dental implantation. The lifetime of the installed implants depends on condition of the bone and on the quality of the treatment planning and surgery technique...

  7. Universal energy ratings for Germany - (Part 2): Evolution of rating distributions according to year of building construction; Universelle Energiekennzahlen fuer Deutschland - Teil 2: Verbrauchskennzahlentwicklung nach Baualtersklassen

    Energy Technology Data Exchange (ETDEWEB)

    Greller, Martin [BRUNATA Waermemesser GmbH and Co. KG, Muenchen (Germany); Schroeder, Franz; Papert, Olaf [METRONA Waermemesser Union GmbH, Muenchen (Germany); Hundt, Volker [BRUNATA Waermemesser Hagen GmbH and Co. KG, Hamburg (Germany); Mundry, Bernhard [Brunata Waermemesser-Gesellschaft Schultheiss GmbH and Co., Huerth (Germany)

    2010-02-15

    vergangenen sechs Jahren. Deren Datenaufbereitung umfasst die rueckwirkende Revision respektive Normierung aller Energiekennzahlen anhand neuer ortsgenauer Klimafaktoren des Deutschen Wetterdienstes. Eine Auswahl von 110.000 Energiekennzahlen von gas- und oelbeheizten Gebaeuden - davon etwa die Haelfte mit Baujahr nach 1977 - werden statistisch gemaess ihrer Kennzahlenentwicklung nach Baualtersklassen aufgeschluesselt. Betrachtet wurden dabei nur nominell waermetechnisch unsanierte Mehrfamilienhaeuser bis 1994 und Neubauten ab 1995. Es wird belegt, dass die Mediane der heutigen Energiekennzahlverteilungen der bis in die 1960-er Jahre gebauten Gebaeude relativ konstant um 155 kWh/(m2a) liegen. Fuer diesen Bauzeitraum fallen die Energiekennzahlen fuer rund 90 % des Bestandes (5 bis 95 % Quantil) zwischen 100 und 260 kWh/(m2a). Seitdem fallen die Mediane stetig auf aktuell bis 85 kWh/(m2a). Der staerkste relative Rueckgang ergibt sich fuer die Baujahre von 1994 nach 1995 mit Inkrafttreten der Waermeschutzverordnung 1995. Die Standardabweichungen der Verteilungen haben sich gegenueber den Gebaeuden aus den 1960-er Jahren von ueber 50 kWh/(m2a) bis auf heute an naehernd 25 kWh/(m2a) etwa halbiert. Eine Gegenueberstellung der empirisch ermittelten Verbrauchskennzahlverteilungen mit den typischen Mindestanforderungen der vergangenen Waermeschutzverordnungen und aktuellen Energieeinsparverordnungen schliessen sich an. Mathematische Parametrierungen der empirischen Kennzahlverteilungen fuer Modell- und Hochrechnungen der Energieeffizienzentwicklung werden mitgeliefert. (Abstract Copyright [2010], Wiley Periodicals, Inc.)

  8. Use of recombinant, human TSH radioiodine therapy in patients with differentiated thyroid carcinoma; Radioiodtherapie des differenzierten Schilddruesenkarzinoms nach Vorbehandlung mit rekombinantem, humanem TSH

    Energy Technology Data Exchange (ETDEWEB)

    Luster, M. [Wuerzburg Univ. (Germany). Klinik und Poliklinik fuer Nuklearmedizin

    2001-12-01

    Hypothyreose behandelt. Ein Patient litt neben einem papillaeren Schilddruesenkarzinom an einer sekundaeren Hypothyreose, ein Patient wurde wegen einer hypophysaeren Metastase und insuffizienter TSH-Produktion nach Radiatio ueberwiesen. Die Behandlung erfolgte nach einem standardisierten Regime: An 2 aufeinander folgenden Tagen wurden jeweils 0,9 mg rhTSH intramuskulaer verabreicht, gefolgt von der oralen Applikation von 1000-7000 MBq I-131 an Tag 3. Bei allen Patienten liess sich eine maximale TSH-Stimulation (>80 mU/l) erreichen, unerwuenschte Nebenwirkungen wurden nicht beobachtet. Im weiteren Verlauf kam es bei 7 Patienten zu einem deutlichen Abfall des Tg-Spiegels 1-4 Monate nach Therapie, 7 Patienten zeigten einen Progress der Erkrankung, hiervon verstarben 3, die in einem praefinalen Stadium behandelt worden waren, in einem Zeitraum von 1-3 Monaten. Zusammenfassend ist festzustellen, dass rekombinantes TSH ein hilfreiches Instrument bei der Behandlung dieses schwierigen Patientenkollektivs darstellt, dennoch kann die infauste Prognose einiger Patienten mit aggressivem Tumorwachstum nicht positiv beeinflusst werden. (orig.)

  9. Echocardiographic changes after mantle-irradiation. Results obtained in a group of patients at Erlangen; Kardiale Spaetfolgen nach Mantelfeldbestrahlung. Ergebnisse im Erlanger Patientenkollektiv

    Energy Technology Data Exchange (ETDEWEB)

    Friedrich, S.A. [Univ. Erlangen-Nuernberg, Erlangen (Germany). Strahlentherapeutische Klinik und Poliklinik; Unverdorben, M. [Univ. Erlangen-Nuernberg, Erlangen (Germany). Medizinische Klinik 2 und Poliklinik; Kunkel, B. [Univ. Erlangen-Nuernberg, Erlangen (Germany). Medizinische Klinik 2 und Poliklinik; Dunst, J. [Univ. Erlangen-Nuernberg, Erlangen (Germany). Strahlentherapeutische Klinik und Poliklinik

    1996-01-01

    Morbus Hodgkin erkrankte Patienten (Alter 39,8{+-}13 Jahre), die sich in den Jahren 1979 bis 1984 einer Mantelfeldbestrahlung (Mediastinaldosis 41,8{+-}7 Gy), zum Teil in Kombination mit Chemotherapie (n=19), unterzogen hatten, wurden untersucht. Die Nachbeobachtungszeit nach Primaertherapie betrug fuenf bis elf Jahre. Das Untersuchungsprogramm umfasste Anamnese, koerperliche Untersuchung, Farb-Doppler-Echokardiographie und Fahrradergometrie. Als Vergleichskollektiv dienten 122 nichtbestrahlte Patienten und Probanden der kardiologischen Ambulanz (Alter 46,1{+-}16 Jahre). Zeichen einer klinisch manifesten kardialen Funktionseinschraenkung ergaben sich nicht. In 26% fand sich eine Perikardverdickung. Eine Ruhetachykardie (Frequenz >100) bestand bei 30% der Patienten, erhoehte Blutdruckwerte bei 33%. Die linksventrikulaere Ejektionsfraktion war normal. Allerdings fanden sich Veraenderungen der diastolischen Parameter: Die Verkuerzungsfraktion war im Vergleich zum Kontrollkollektiv signifikant vermindert (p<0,05), ebenso die fruehdiastolische Relaxationszeit (p<0,05). Ischaemiezeichen (5%), Reizleitungsstoerungen (7%) und Rhythmusstoerungen (7%) waren nicht gehaeuft. Nach Mantelfeldbestrahlung zeigten die Patienten in dieser Nachuntersuchung innerhalb der ersten zehn Jahre nach Therapie nur minimale kardiologische Veraenderungen. Der sensitivste Parameter ist die echokardiographische Messung der fruehdiastolischen Relaxationszeit. Die klinische Relevanz dieser Befunde ist bisher unklar. Eine kardiologische Kontrolle von Patienten in Langzeitremission erscheint indiziert. (orig./MG)

  10. Computer-guided Implant dentistry.

    Science.gov (United States)

    Schnitman, Paul A

    2007-01-01

    Computer-guided minimally invasive implant treatment promises to revolutionize the way we practice implant dentistry. This new technology allows implants and associated restorations to be precisely placed at the same procedure directly through the gingiva in an hour or less. Since there is no incision, there is minimal postoperative discomfort or swelling and no sutures.

  11. Recent advances in dental implants.

    Science.gov (United States)

    Hong, Do Gia Khang; Oh, Ji-Hyeon

    2017-12-01

    Dental implants are a common treatment for the loss of teeth. This paper summarizes current knowledge on implant surfaces, immediate loading versus conventional loading, short implants, sinus lifting, and custom implants using three-dimensional printing. Most of the implant surface modifications showed good osseointegration results. Regarding biomolecular coatings, which have been recently developed and studied, good results were observed in animal experiments. Immediate loading had similar clinical outcomes compared to conventional loading and can be used as a successful treatment because it has the advantage of reducing treatment times and providing early function and aesthetics. Short implants showed similar clinical outcomes compared to standard implants. A variety of sinus augmentation techniques, grafting materials, and alternative techniques, such as tilted implants, zygomatic implants, and short implants, can be used. With the development of new technologies in three-dimension and computer-aided design/computer-aided manufacturing (CAD/CAM) customized implants can be used as an alternative to conventional implant designs. However, there are limitations due to the lack of long-term studies or clinical studies. A long-term clinical trial and a more predictive study are needed.

  12. Biomimetic approach to dental implants.

    Science.gov (United States)

    Kim, Tae-Il; Jang, Jun-Hyeog; Kim, Hae-Won; Knowles, Jonathan C; Ku, Young

    2008-01-01

    Titanium, as an implant material, is regarded to be durable and biocompatible, which allows functional replacement of missing teeth. Successful dental implantation depends on an osseointegration phenomenon, a direct structural and functional binding reaction between bone and implant. It is well known that physicochemical characteristics of the dental implant surface, such as roughness, topography, chemistry, and electrical charge affect the biological reactions occurring at the interface of tissue and implant. Therefore, considerable efforts have been made to modify the surface of titanium implants which are based on mechanical, physical and chemical treatments. Recently, biological molecules were introduced onto the surface of implants to stimulate osteogenic cells in the early stage of implantation and consequently accelerate bone formation around implant and subsequent rapid implant stabilization. A range of extracellular matrix components, designed peptides, and growth factors have been proposed as the biological moiety. In this review, we address several issues related to the biology of dental implants and discuss biomimetic modification of the implant surface as a novel approach to obtain successful osseointegration.

  13. Treatment of peri-implantitis and the failing implant.

    Science.gov (United States)

    Robertson, Kevin; Shahbazian, Timothy; MacLeod, Stephen

    2015-04-01

    Appropriate treatment of implants is becoming increasingly important for the general dentist as the number of implants placed per year continues to increase. Early diagnosis of peri-implantitis is imperative; initiating the correct treatment protocol depends on a proper diagnosis. Several risk factors exist for the development of peri-implantitis, which can guide patient selection and treatment planning. Treatment of peri-implantitis should be tailored to the severity of the lesion (as outlined by the cumulative interceptive supportive treatment protocol), ranging from mechanical debridement to explantation. Several surgical and nonsurgical treatment alternatives exist. There is little consensus on superior treatment methods. Published by Elsevier Inc.

  14. Remote actuated valve implant

    Science.gov (United States)

    McKnight, Timothy E; Johnson, Anthony; Moise, Jr., Kenneth J; Ericson, Milton Nance; Baba, Justin S; Wilgen, John B; Evans, III, Boyd McCutchen

    2014-02-25

    Valve implant systems positionable within a flow passage, the systems having an inlet, an outlet, and a remotely activatable valve between the inlet and outlet, with the valves being operable to provide intermittent occlusion of the flow path. A remote field is applied to provide thermal or magnetic activation of the valves.

  15. Implantable enzyme amperometric biosensors.

    Science.gov (United States)

    Kotanen, Christian N; Moussy, Francis Gabriel; Carrara, Sandro; Guiseppi-Elie, Anthony

    2012-05-15

    The implantable enzyme amperometric biosensor continues as the dominant in vivo format for the detection, monitoring and reporting of biochemical analytes related to a wide range of pathologies. Widely used in animal studies, there is increasing emphasis on their use in diabetes care and management, the management of trauma-associated hemorrhage and in critical care monitoring by intensivists in the ICU. These frontier opportunities demand continuous indwelling performance for up to several years, well in excess of the currently approved seven days. This review outlines the many challenges to successful deployment of chronically implantable amperometric enzyme biosensors and emphasizes the emerging technological approaches in their continued development. The foreign body response plays a prominent role in implantable biotransducer failure. Topics considering the approaches to mitigate the inflammatory response, use of biomimetic chemistries, nanostructured topographies, drug eluting constructs, and tissue-to-device interface modulus matching are reviewed. Similarly, factors that influence biotransducer performance such as enzyme stability, substrate interference, mediator selection and calibration are reviewed. For the biosensor system, the opportunities and challenges of integration, guided by footprint requirements, the limitations of mixed signal electronics, and power requirements, has produced three systems approaches. The potential is great. However, integration along the multiple length scales needed to address fundamental issues and integration across the diverse disciplines needed to achieve success of these highly integrated systems, continues to be a challenge in the development and deployment of implantable amperometric enzyme biosensor systems. Copyright © 2012 Elsevier B.V. All rights reserved.

  16. Remote actuated valve implant

    Energy Technology Data Exchange (ETDEWEB)

    McKnight, Timothy E.; Johnson, Anthony; Moise, Kenneth J.; Ericson, Milton Nance; Baba, Justin S.; Wilgen, John B.; Evans, Boyd Mccutchen

    2016-05-10

    Valve implant systems positionable within a flow passage, the systems having an inlet, an outlet, and a remotely activatable valve between the inlet and outlet, with the valves being operable to provide intermittent occlusion of the flow path. A remote field is applied to provide thermal or magnetic activation of the valves.

  17. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne

    2011-01-01

    Studies of complications following reconstructive surgery with implants among women with breast cancer are needed. As the, to our knowledge, first prospective long-term study we evaluated the occurrence of complications following delayed breast reconstruction separately for one- and two-stage pro......Studies of complications following reconstructive surgery with implants among women with breast cancer are needed. As the, to our knowledge, first prospective long-term study we evaluated the occurrence of complications following delayed breast reconstruction separately for one- and two......-stage procedures. From the Danish Registry for Plastic Surgery of the Breast, which has prospectively registered data for women undergoing breast implantations since 1999, we identified 559 women without a history of radiation therapy undergoing 592 delayed breast reconstructions following breast cancer during...... the period 1999 to 2006; 239 one-stage procedures and 353 two-stage procedures. The postoperative course through November 2009 was evaluated by cumulative incidence adjusting for competing risks for the selected outcomes; hematoma, infection, seroma, implant rupture, severe capsular contracture (modified...

  18. Middle ear implants

    Directory of Open Access Journals (Sweden)

    K S Gangadhara Somayaji

    2013-01-01

    Full Text Available Hearing loss is becoming more common in the society living in cities with lot of background noise around, and frequent use of gadgets like mobile phones, MP3s, and IPods are adding to the problem. The loss may involve the conductive or perceptive pathway. Majority of the patients with conductive hearing loss will revert back to normal hearing levels with medical and/or surgical treatment. However, in sensorineural hearing loss, many factors are involved in the management. Though traditionally hearing aids in various forms are the most commonly used modality in managing these patients, there are some drawbacks associated with them. Implantable middle ear amplifiers represent the most recent breakthrough in the management of hearing loss. Middle ear implants are surgically implanted electronic devices that aim to correct hearing loss by stimulating the ossicular chain or middle ear. Of late, they are also being used in the management of congenital conductive hearing loss and certain cases of chronic otitis media with residual hearing loss. The article aims to provide general information about the technology, indications and contraindications, selection of candidates, available systems, and advantages of middle ear implants. (MEI

  19. Dental Implant Surgery

    Science.gov (United States)

    ... upper jaw protrude into one of your sinus cavities How you prepare Because dental implants require one or more surgical procedures, you ... can take several months, helps provide a solid base for your new artificial tooth ... teeth. Placing the abutment When osseointegration is complete, you ...

  20. Corrosion of bio implants

    Indian Academy of Sciences (India)

    Chemical stability, mechanical behaviour and biocompatibility in body fluids and tissues are the basic requirements for successful application of implant materials in bone fractures and replacements. Corrosion is one of the major processes affecting the life and service of orthopaedic devices made of metals and alloys used ...

  1. Implantable Impedance Plethysmography

    Directory of Open Access Journals (Sweden)

    Michael Theodor

    2014-08-01

    Full Text Available We demonstrate by theory, as well as by ex vivo and in vivo measurements that impedance plethysmography, applied extravascularly directly on large arteries, is a viable method for monitoring various cardiovascular parameters, such as blood pressure, with high accuracy. The sensor is designed as an implant to monitor cardiac events and arteriosclerotic progression over the long term.

  2. [Retinal implants. Patients' expectations].

    Science.gov (United States)

    Gusseck, H

    2005-10-01

    The "Pro Retina" Society and the "Retina Implant" Foundation, two patients associations with the goal of "preventing blindness," view the "Retina Implant" project as a possibility for providing blind individuals a modicum of restored vision. Both patients associations cultivated a cooperative relationship with researchers and policy makers already during the research phase, introducing the wishes and concerns of patients into considerations and providing information and the groundwork for acceptance in society and among those who may potentially benefit from the method. An initial survey of patients, the visually impaired, and blind people revealed that recovery of sight not only represents a medical and technical problem but that it also involves numerous psychosocial implications. By adhering to ethical standards in implantations, in particular by taking patient autonomy into consideration, anxieties and fears can be reduced. It would appear from early positive results in a short-term clinical study that soon successful chronic retinal implantation can be expected. The dedication displayed by physicians, researchers, and the industry as well as the willingness of the Federal Ministry for Research to take the risk are appreciated and greatfully accepted by the patients and their relatives.

  3. Implantable Drug Dispenser

    Science.gov (United States)

    Collins, E. R. J.

    1983-01-01

    Drugs such as insulin are injected as needed directly into bloodstream by compact implantable dispensing unit. Two vapor cavities produce opposing forces on drug-chamber diaphragm. Heaters in cavities allow control of direction and rate of motion of bellows. Dispensing capsule fitted with coil so batteries can be recharged by induction.

  4. Paediatric cochlear implantation

    African Journals Online (AJOL)

    Chantel

    The internal portion consists of a multi- channel electrode array that is implanted in the cochlea and is attached to a receiv- er/stimulator, an antenna and a .... ties, cerebral palsy, sensory integra- tion problems, blindness and autism can be considered as CI candidates. The literature shows that CIs benefit children with hear-.

  5. Activation of blood clotting and fibrinolysis in angiocardiography with ionic and non-ionic contrast medium; Aktivierung von Blutgerinnung und Fibrinolyse nach Angiokardiographie mit ionischem und nichtionischem Kontrastmittel

    Energy Technology Data Exchange (ETDEWEB)

    Winkler, U.H. [Gerinnungsphysiologisches Lab., Zentrum fuer Frauenheilkunde, Universitaetsklinikum Essen (Germany); Park, J.W. [Herz-Zentrum Kaiser-Wilhelm-Krankenhaus, Duisburg (Germany); Weber, S. [Schering AG, Geschaeftsbereich Deutschland, Berlin (Germany); Kothe, A. [Gerinnungsphysiologisches Lab., Zentrum fuer Frauenheilkunde, Universitaetsklinikum Essen (Germany); Schnitker, J. [Inst. fuer Angewandte Statistik GmbH, Bielefeld (Germany); Behrends-Steins, B. [Schering AG, Geschaeftsbereich Deutschland, Berlin (Germany); Albring, M. [Schering AG, Geschaeftsbereich Deutschland, Berlin (Germany)

    1997-06-01

    Purpose: To study the effects of a ionic (amidotrizoate) and a nonionic X-ray contrast medium (iopromid) during routine levocardiography and coronary angiography, we employed assays that detect reaction products of thrombin and plasmin to assess the activation of the haemostatic system. Methods: Subsequent to informed consent, 20 patients were randomly assigned to receive either amidotrizoate or iopromid during standard levocardiography and coronary angiography in a double-blind comparative study. Groups were comparable in respect of age, weight, sex and severity of the disease. No anticoagulation was provided. Coronary angiography was performed according to a standardised protocol. Consumption of contrast media and duration of the examination were comparable in both groups. Results: Thrombin generation (F.1+2) and thrombin activity (TAT) were higher with the ionic contrast medium but did not attain statistical significance. Fibrin generation and degradation as expressed by D-dimer fibrin split products was significantly increased in patients who had been receiving amidotrizoate (p<0,05, U-Test). Conclusion: The non-ionic X-ray contrast medium induced significantly less haemostatic activation in vivo than did the ionic medium amidotrizoate. These data suggest that earlier in vitro observations of more pronounced anticoagulant effects of ionic X-ray contrast media are of limited significance for the evaluation of in vivo effects of X-ray contrast media on haemostatic function. (orig.) [Deutsch] Ziel: Bestimmung der Aktivitaet des haemostatischen Systems in vivo nach Gabe von ionischem und nichtionischem Roentgenkontrastmittel in der Angiokardiographie. Material und Methoden: In eine randomisierte doppelblinde Vergleichsstudie mit den Kontrastmitteln Amidotrizoat und Iopromid wurden 20 Patienten (10 pro Gruppe) einbezogen. Bei der aus medizinischen Gruenden indizierten Angiokardiographie wurden 5 repraesentative Reaktionsprodukte der thrombin- und plasmininduzierten

  6. Radiologic assessment of the outcome of Keller and Brandes arthroplasty for hallux rigidus; Hallux rigidus operiert nach Keller und Brandes: Radiologische Erfolgs- und Prognoseparameter

    Energy Technology Data Exchange (ETDEWEB)

    Breitenseher, M.J. [Abt. fuer Osteologie, Universitaetsklinik fueer Radiodiagnostik und Besondere Klinische Einrichtung Magnet Resonanz, Wien (Austria)]|[Ludwig-Boltzmann-Institut fuer Radiologische Tumordiagnostik, Wien (Austria); Toma, C.D. [Universitaetsklinik fuer Orthopaedie, Wien (Austria); Gottsauner-Wolf, F. [Universitaetsklinik fuer Orthopaedie, Wien (Austria); Imhof, H. [Abt. fuer Osteologie, Universitaetsklinik fueer Radiodiagnostik und Besondere Klinische Einrichtung Magnet Resonanz, Wien (Austria)]|[Ludwig-Boltzmann-Institut fuer Radiologische Tumordiagnostik, Wien (Austria)

    1996-06-01

    The aim of this study was to evaluate the pre- and postoperative radiographic findings of hallux rigidus treated with Keller and Brandes arthroplasty to determine the radiographic outcome and to identify a prognostic marker. 83 patients with a total of 121 cases of hallux rigidus operated using Keller and Brandes arthroplasty were followed up (mean 9.7 y). A comparison of the pre- and postoperative radiographs, the clinical and subjective findings was predicated on a five point scale: 1. Percentage of proximal phalanx resected (<33%, 33-50%, >50%), 2. joint space, 3. ratio of the length of the first and second metatarsals, 4. first intermetatarsal angle, and 5. hallux valgus angle. In the patient group which had 33-50% of the proximal phalanx excised (n=67. 55%) the highest patient satisfaction was observed (96%). If resection of the proximal phalanx exceeded 50% (n=13. 11%), non physiologic dorsiflexion of the toe occurred and patients were unsatisfied (62%). Excision of less than 33% of the hallux (n=41. 34%) was associated with a recurrent hallux rigidus. No other evaluated radiological parameter proved to be of significance. The most important radiological parameter in the evaluation of the outcome of Keller and Brandes arthroplasty as the percentage of the proximal phalanx which had ben excised. (orig.) [Deutsch] Ziel der Studie war es, auf prae- und postoperativen Roentgenbildern des Hallux rigidus radiologische Parameter zu ermitteln, die den Erfolg der Arthroplastik nach Keller und Brandes abschaetzen und von prognostischer Relevanz sind. 121 Hallux-rigidus-Operationen bei 83 Patienten wurden nachuntersucht (9,7 a). 5 Kriterien wurden an den prae- und postoperativen Roentgenbildern ausgewertet: 1. Anteil der Grosszehengrundgliedresektion in Prozent (<33%, 33-50%, >50%), 2. Gelenkspaltbreite, 3. Laengenverhaeltnis von erstem und zweitem Metartasalknochen, 4. erster Intermetatarsalwinkel und 5. Hallux-valgus-Winkel und mit den klinischen Ergebnissen

  7. Prospective review of integral implants.

    Science.gov (United States)

    Block, M S; Kent, J N

    1992-01-01

    There are several factors that strongly correlate to HA-coated implant success and the prevention of implant morbidity. Surgical placement must be performed without compromise in technique. Implants placed into thin ridges or those that had dehiscence of their surface did not uniformly gain bone attachment levels during the healing period. Countersinking implants in extraction sites was critical; labial bone implant defects should be grafted with particulate HA. HA grafts to labial bone defects at the time of implant placement surgery are still short-term. Primary closure of all implant surgical sites prevented epithelial invagination into the surgical site and is associated with improved bone height around implants. Premature exposure of the implant during the healing period is associated with crestal bone loss. Loading forces should be physiologic, with maintenance of a physiologic equilibrium by a balanced restoration. Bone bulk should be created or preserved. Bone around implants may adversely respond to excessive loading forces. In the posterior maxilla, crestal bone loss has been observed that seems to result from excessive cantilever-type forces placed on the implants or from when implants are placed in the posterior mandible developed progressive bone loss that was associated with several factors. These factors included articulation against a natural occlusion, a horizontal ridge contour level with the external oblique ridge, a nonhygienic restoration, and the lack of keratinized gingiva against the abutment. Whether titanium implants develop progressive bone loss in the face of these factors is unknown. The presence of keratinized gingiva strongly correlated to bone maintenance in the posterior mandible. Because of this statistically significant finding, implant exposure should preserve all keratinized gingiva by transposing it labially to the implants. Most patients who receive implants for dental restoration have lost teeth because of caries and

  8. Zu den gesetzlichen Grundlagen der Lehrerbildung in Japan und zu EU- und Deutschlandbild nach der Wiedervereinigung in japanischen Schulbüchern für höhere Schulen

    OpenAIRE

    Hillenbrand, Hans (Prof.)

    1997-01-01

    Zu den gesetzlichen Grundlagen der Lehrerbildung in Japan und zu EU- und Deutschlandbild nach der Wiedervereinigung in japanischen Schulbüchern für höhere Schulen. - In: Die Geographiedidaktik ist tot, es lebe die Geographiedidaktik : Festschr. zur Emeritierung von Josef Birkenhauser / hrsg. von Friedhelm Frank ... - München, 1997. - S. 95-110. - (Münchner Studien zur Didaktik der Geographie ; 8)

  9. Engineered porous metals for implants

    Science.gov (United States)

    Vamsi Krishna, B.; Xue, Weichang; Bose, Susmita; Bandyopadhyay, Amit

    2008-05-01

    Interest is significant in patient-specific implants with the possibility of guided tissue regeneration, particularly for load-bearing implants. For such implants to succeed, novel design approaches and fabrication technologies that can achieve balanced mechanical and functional performance in the implants are necessary. This article is focused on porous load-bearing implants with tailored micro-as well as macrostructures using laser-engineered net shaping (LENS™), a solid freeform fabrication or rapid prototyping technique that can be used to manufacture patient-specific implants. This review provides an insight into LENS, some properties of porous metals, and the potential applications of this process to fabricate unitized structures which can eliminate longstanding challenges in load-bearing implants to increase their in-vivo lifetime, such as in a total hip prosthesis.

  10. Beijing Bubble, Beijing Bust: Inequality, Trade, and Capital Inflow into China Beijing Blase, Beijing Krise: Ungleichheit, Handel und Kapitalzufluss nach China

    Directory of Open Access Journals (Sweden)

    James K. Galbraith

    2009-07-01

    Full Text Available This paper explores the relationships between inequality, trade, and capital flows into China since the early 1990s and particularly in the first years of the present decade. We show that the rise in economic inequality in China has more to do directly with the activities associated with China’s financial and building boom, notably in Beijing, than with the massive growth in manufacturing employment and in Chinese exports since China joined the WTO in 2001. Nevertheless, it is likely that a flow of profits from the export boom did feed the speculative fires in the capital and elsewhere, and therefore it should be no surprise that the fall of one should be linked to the fall of the other, in a particularly painful reduction of economic inequality. In diesem Artikel werden die Beziehungen zwischen Ungleichheit, Handel und Kapitalzufluss nach China seit den frühen 1990er Jahren untersucht. Es wird aufgezeigt, dass die steigende wirtschaftliche Ungleichheit in China weit mehr mit Chinas Finanz- und Bauboom insbesondere in Beijing zu tun hat als mit dem großen Anstieg der Beschäftigung in der Produktion und in Chinas Exporten seit dem WTO-Beitritt im Jahr 2001.

  11. Intrafascial hematoma of the musculus rectus abdominis as a complication after laparoscopic operations; Intrafasziale Haematome des Musculus rectus abdominis als Komplikation nach laparoskopischen Operationen

    Energy Technology Data Exchange (ETDEWEB)

    Pennekamp, W. [Radiologische Universitaetsklinik am St. Josef-Hospital, Bochum (Germany); Barbera, L. [Chirurgische Universitaetsklinik am St. Josef-Hospital, Bochum (Germany)

    1998-01-01

    We report on two patients with intrafascial hematoma of the musculus rectus abdominis following laparoscopic operations. One patient was operated on a stenosis of the common iliac artery for an aortofemoral bypass. The other patient was operated on an inguinal hernia. Only a CT scan of the abdomen led to the correct diagnosis, because the use of ultrasound was limited by pneumoperitoneum and bandages, and retroperitoneal bleeding could not be recognized. Computed tomography is a valid method for detecting this complication of laparoscopic surgery. (orig.) [Deutsch] Es wird ueber zwei Patienten berichtet, die nach einer laparoskopischen Operation ein intrafasziales Haematom des Musculus rectus abdominis entwickelten. Bei einem Patienten wurde laparoskopisch ein aortofemoraler Bypass bei hochgradiger A.-iliaca-communis-Stenose, bei dem anderen Patienten ein laparoskopischer Bruchlueckenverschluss bei einer Inguinalhernie durchgefuehrt. Erst die Computertomographie des Abdomens fuehrte in beiden Faellen zur richtigen Diagnose, da Ultraschall aufgrund des Pneumoperitoneous und der Verbandsmaterialien nur bedingt einsetzbar war und retroperitoneale Blutungsansteile nicht erkannt werden konnten. Der Stellenwert der Computertomographie zur Erkennung dieser Komplikation wird hervorgehoben. (orig.)

  12. Suche nach Sleptonen und leptonisch zerfallenden Charginos in $e^+ e^-$ Kollisionen bei Schwerpunktsenergien bis zu 184 GeV mit dem ALEPH-Detektor

    CERN Document Server

    Van Gemmeren, P

    1998-01-01

    In den Jahren 1996 und 1997 konnte der ALEPH--Detektor bei Schwerpunktsenergien zwischen 161 GeV und 184 GeV Daten mit einer integrierten Luminosit"at von mehr als 80 pb^-1 aufzeichnen. Diese Daten wurden nach einem "Uberschu"s an Ereignissen mit acoplanaren Leptonen untersucht. Da sowohl deren Anzahl als auch deren Ereignisgr"o"sen mit der Standardmodell- erwartung gut vertr"aglich sind, kann die Produktion von Selektronen, Smyonen und Charginos, falls diese leptonisch zerfallen, f"ur bestimmte Massenkombi- nationen mit einem Vertrauensinterval von $95\\%$ ausgeschlossen werden: - Rechtsh"andige Selektronen m"ussen schwerer als 81 GeV/c^2 sein, falls die Massendifferenz zum leichtesten Neutralino Delta m mindestens 10 GeV/c^2 gro"s ist. - F"ur Selektronen mit Delta m > 5 GeV/c^2 (Delta m > 3 GeV/c^2) wird eine untere Grenze von 74 GeV/c^2 (68 GeV/c^2) gefunden. - Rechtsh"andige Smyonen m"ussen schwerer als 71 GeV/c^2 sein, falls die Massendifferenz mindestens 5 GeV/c^2 betr"agt. Hierbei wird ein Verzweigungs-...

  13. Mycotic aneurysm of the superior mesenteric artery after septic embolism; Entwicklung eines mykotischen Aneurysmas der A. mesenterica superior nach septischer Embolie

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, F.; Dinkel, H.P. [Institut fuer Diagnostische Radiologie, Inselspital, Universitaetsklinik Bern (Switzerland)

    2002-07-01

    Mycotic aneurysms of the aorta and the visceral arteries are life-threatening diseases, due to potential rupture and organ or limb ischemia. They occur in endocarditis, immunodeficiency, bacteremia and fungemia, and have a poor prognosis.We report on a case of a 54-year-old male patient suffering from abdominal angina after mitral valve replacement for septic mycotic endocarditis. In presence of a mycotic-embolic occlusion of the left popliteal artery and multiple septic organ infarctions a mycotic aneurysm of the superior mesenteric artery was found in abdominal spiral-CT.Based on sequential spiral-CT examinations, this case demonstrates the development of a septic aneurysm of the superior mesenteric artery. (orig.) [German] Mykotische Aneurysmen der Aorta und ihrer Aeste stellen wegen Rupturgefahr und moeglicher Minderperfusion von Organen und Extremitaeten eine lebensgefaehrliche Erkrankung mit unguenstiger Prognose dar. Beguenstigende Faktoren sind geschwaechte Immunabwehr, Endokarditis, Bakteriaemie und Fungaemie.Wir berichten ueber einen 54-jaehrigen Patienten, der nach einem Mitralklappenersatz bei mykotischer Endokarditis zunehmende abdominelle Beschwerden im Sinne einer Angina abdominalis entwickelte. Die abdominelle Spiralcomputertomographie zeigte ein mykotisches Aneurysma der A. mesenterica superior. Daneben bestanden ein mykotischer Verschluss der linken A. poplitea und multiple septische Organinfarkte.Der Fall demonstriert anhand sequentieller Computertomographien eindrucksvoll die Entwicklung eines septischen Viszeralarterienaneurysmas. (orig.)

  14. Alar ligaments: radiological aspects in the diagnosis of patients with whiplash injuries; Stellenwert bildgebender Verfahren in der Diagnostik der Ligg. alaria nach Beschleunigungsverletzung der Halswirbelsaeule

    Energy Technology Data Exchange (ETDEWEB)

    Muhle, C. [Klinik fuer Nuklearmedizin, Christian-Albrechts-Univ. zu Kiel (Germany); Brossmann, J.; Biederer, J.; Jahnke, Th.; Grimm, J.; Heller, M. [Klinik fuer Diagnostische Radiologie, Christian-Albrechts-Univ. zu Kiel (Germany)

    2002-04-01

    Post-traumatic changes of the alar ligaments have been proposed to be the cause of chronic pain in patients after whiplash injury of the cervical spine. In addition to an asymmetric dens position, widening of the atlantodental distance to more than 12 mm can be an indirect sign of an alar ligament rupture. CT is recommended for detection of a avulsion fracture of the occipital condyle. Isolated ruptures of the alar ligaments are best visualized on MRI. In patients with chronic impairments after whiplash injuries changes of the alar ligaments on MRI must be differentiated from normal variants in healthy individuals. (orig.) [German] Posttraumatische Veraenderungen der Ligg. alaria werden als ursaechlich fuer chronische Beschwerden bei Patienten mit Beschleunigungsverletzungen der Halswirbelsaeule angesehen. Eine asymmetrische Densposition sowie eine Erweiterung der anterioren atlantoaxialen Distanz auf ueber 12 mm koennen auf konventionellen Roentgenaufnahmen ein indirektes Zeichen fuer das Vorliegen einer Fluegelbandverletzung sein. Die Computertomographie ist die Methode der Wahl zum Nachweis einer kondylaeren Ausrissfraktur des Lig. alare. Isolierte akute Bandverletzungen der Ligg. alaria sind hingegen in der MRT direkt nachweisbar. Bei Patienten mit chronischen Beschwerden nach Beschleunigungsverletzungen der Halswirbelsaeule muessen allerdings morphologische Auffaelligkeiten der Ligg. alaria im MRT von Normvarianten abgegrenzt werden. (orig.)

  15. Efter cochlear implant

    DEFF Research Database (Denmark)

    Højen, Anders

    2007-01-01

      Dit barn har netop fået et cochlear implant. Hvad nu? Skal barnet fokusere udelukkende på at lære talt sprog, eller skal det også lære/fortsætte med tegnsprog eller støttetegn? Det er et vanskeligt spørgsmål, og før valget foretages, er det vigtigt at vurdere hvilke konsekvenser valget har, dels...... for den sproglige udvikling isoleret set, og dels for barnets udvikling ud fra en helhedsbetragtning. Dette indlæg fokuserer på, hvilke forventninger man kan have til cochlear implant-brugeres sproglige udvikling med talt sprog alene, hhv. med to sprog (tale og tegn). Disse forventninger er baseret på...

  16. Efter cochlear implant

    DEFF Research Database (Denmark)

    Højen, Anders

    Dit barn har netop fået et cochlear implant. Hvad nu? Skal barnet fokusere udelukkende på at lære talt sprog, eller skal det også lære/fortsætte med tegnsprog eller støttetegn? Det er et vanskeligt spørgsmål, og før valget foretages, er det vigtigt at vurdere hvilke konsekvenser valget har, dels...... for den sproglige udvikling isoleret set, og dels for barnets udvikling ud fra en helhedsbetragtning. Dette indlæg fokuserer på, hvilke forventninger man kan have til cochlear implant-brugeres sproglige udvikling med talt sprog alene, hhv. med to sprog (tale og tegn). Disse forventninger er baseret på...

  17. COCHLEAR IMPLANTATION IN IRAN

    Directory of Open Access Journals (Sweden)

    M.H. Khalessi

    1996-07-01

    Full Text Available Deafness has been considered a non - resolving problem until the invention of cochlear implantation (CI. We are reporting the pre- and post-operative results of 14 patients underwent CI, for the first time in Iran, at the cochlear implantation Clinic of Tehran University of Medical Sciences. Four of our patients were able to hold a telephone conversation without difficulty 3 months post-operatively and the rest achieved considerable scores on audiologic tests and a remarkable improvement over 9 month interval between the two sets of tests. Also we have addressed the dramatic improvement in the quality of life of these patients in this paper as well as the results of promontory stimulation and audiometry.

  18. [Implantable middle ear hearing aids].

    Science.gov (United States)

    à Wengen, D F

    2004-01-01

    Conventional acoustic hearing aids are limited in their performance. Due to physical laws their amplification of sound is limited to within 5 kHz. However, the frequencies between 5 and 10 kHz are essential for understanding consonants. Words can only be understood correctly if their consonants can be understood. Furthermore noise amplification remains a problem with hearing aids. Other problems consist of recurrent infections of the external auditory canal, intolerance for occlusion of the ear canal, feedback noise, and resonances in speech or singing. Implantable middle ear hearing aids like the Soundbridge of Symphonix-Siemens and the MET of Otologics offer improved amplification and a more natural sound. Since the first implantation of a Soundbridge in Switzerland in 1996 almost one thousand patients have been implanted worldwide. The currents systems are semi-implantable. The external audio processor containing the microphone, computer chip, battery and radio system is worn in the hair bearing area behind the ear. Implantation is only considered after unsuccessful fitting of conventional hearing aids. In Switzerland the cost for these implantable hearing aids is covered by social insurances. Initially the cost for an implant is higher than for hearing aids. However, hearing aids need replacement every 5 or 6 years whereas implants will last 20 to 30 years. Due to the superior sound quality and the improved understanding of speech in noise, the number of patients with implantable hearing aids will certainly increase in the next years. Other middle ear implants are in clinical testing.

  19. Tubo-uterine implantation.

    Science.gov (United States)

    Green-armytage, V G

    1957-02-01

    After characterizing 2 types of patients presenting with tubal infertility (1 that is "as a rule overweight (the uterus is fixed (and there is easily palpable tubo-uterine pathology," and 1 that is "slim, young, intelligent and often beautiful", 12 1-sentence suggestions are made to increase the success of tubo-uterine implantations in the second type of presenting patient (because the first group has, in the author's mind, disappointing prognosis). Figures are the bulk of the document, with 3 figures demonstrating the type of operation, 3 showing the scheme of the operation, 1 figure showing a posterior view of the implanted tube in utero with a polyethylene prosthesis in situ down to the cervix, and 1 figure showing the instruments used in the operation. A few points of experience the author shares are: 1) operate immediately after a menstrual period; 2) give antibiotics prophylactically and after the procedure; 3) use a Bonney Myomectomy Clamp to elevate the uterus; 4) never use a knife or bistoury at the cornua; 5) use polyethylene rods, when available; and 6) caesarean section is the indicated delivery route after tubo-uterine implantation. Out of 38 patients with the requisite history and findings who have been operated on by this author, 14 have gone to full-term, i.e., 36.1%; 2 have aborted, giving a pregnancy rate of 42.2%, and there was 1 ectopic pregnancy.

  20. Persistent inflammation and tumour response in rats after intratracheal installation of high doses of coal dusts, Ti dioxide and quartz; Chronische Entzuendung und Tumorbildung in Ratten nach intratrachealer Instillation hoher Dosen von Kohlenstaeuben, Titandioxid und Quarz

    Energy Technology Data Exchange (ETDEWEB)

    Borm, P.J.A.; Hoehr, D.; Steinfartz, Y.; Zeittraeger, I.; Albrecht, C. [Heinrich-Heine Univ., Duesseldorf (Germany). Medizinisches Inst. fuer Umwelthygiene

    2001-10-01

    The aim of this study was to investigate persistent inflammation and tumor response in the rat after intratracheal instillation of two coal dust samples and other dust preparations. Female Wistar rats (190 gr) were instilled with ground lean coal (60 mg), coal mine dust (60 mg), DQ12 quartz (5 mg) and fine (60 mg) and ultrafine (30 mg) TiO{sub 2}. After 129 weeks rats were killed, tumors detected by macroscopy, and inflammation by immunohistochemistry using specific antibody staining for macrophages and granulocytes. Increased alveolar macrophages (AM) and interstitial granulocytes were still present in dust treated animals. Both AM and granulocytes per surface area were related to tumor incidence when all materials were plotted in one graph, and can be interpreted as effects of overload. Differences in tumor formation between fine and ultrafine TiO{sub 2}, despite similar inflammatory response, are probably caused by a direct effect of ultrafine TiO{sub 2} after interstitialisation. It is concluded that coal dust is another poorly soluble, non-toxic dust, which at high enough dose-rate causes overload, inflammation and tumor response in the rat. (orig.) [German] Das Ziel dieser vorliegenden Studie war die Untersuchung der persistierenden Entzuendung und Tumorantwort in Ratten nach der intratrachealen Instillation von zwei verschiedenen Kohlenstaeuben und anderer Staubpraeparationen. Weiblichen Wistarratten (190 g) wurde Kohlenstaub (Quarzgehalt <0,1%, 60 mg), Gesteinsstaub (Quarzgehalt 16,7%, 60 mg), DQ12 Quarz (5 mg) sowie feinen (60 mg) und ultrafeinen (30 mg) Titandioxid instilliert. Nach 129 Wochen wurden die Ratten getoetet, die Lungen makroskopisch auf Tumoren untersucht und die Entzuendung nach spezifischer Antikoerperfaerbung gegen Makrophagen und neutrophile Granulozyten immunohistochemisch bestimmt. Ein Anstieg an Alveolarmakrophagen (AM) und interstitiellen Granulozyten wurde in den staubbehandelten Ratten nachgewiesen. Die Zahl der AM und der

  1. Cochlear implants in children implanted in Jordan: A parental overview.

    Science.gov (United States)

    Alkhamra, Rana A

    2015-07-01

    Exploring the perspective of parents on the cochlear implant process in Jordan. Sixty parents of deaf children were surveyed on the information gathering process prior to cochlear implant surgery, and their implant outcome expectations post-surgery. Whether child or parent characteristics may impact parents' post-surgical expectations was explored. Although parents used a variety of information sources when considering a cochlear implant, the ear, nose and throat doctor comprised their major source of information (60%). Parents received a range of information prior to cochlear implant but agreed (93.3%) on the need for a multidisciplinary team approach. Post-surgically, parents' expected major developments in the areas of spoken language (97%), and auditory skills (100%). Receiving education in mainstream schools (92%) was expected too. Parents perceived the cochlear implant decision as the best decision they can make for their child (98.3%). A significant correlation was found between parents contentment with the cochlear implant decision and expecting developments in the area of reading and writing (r=0.7). Child's age at implantation and age at hearing loss diagnosis significantly affected parents' post-implant outcome expectations (pparents agree on the need for a comprehensive multidisciplinary team approach during the different stages of the cochlear implant process. Parents' education about cochlear implants prior to the surgery can affect their post-surgical outcome expectations. The parental perspective presented in this study can help professionals develop better understanding of parents' needs and expectations and henceforth improve their services and support during the different stages of the cochlear implant process. Copyright © 2015. Published by Elsevier Ireland Ltd.

  2. New dental implant selection criterion based on implant design.

    Science.gov (United States)

    El-Anwar, Mohamed I; El-Zawahry, Mohamed M; Ibraheem, Eman M; Nassani, Mohammad Zakaria; ElGabry, Hisham

    2017-01-01

    A comparative study between threaded and plain dental implant designs was performed to find out a new criterion for dental implant selection. Several dental implant designs with a systematic increase in diameter and length were positioned in a cylindrical-shaped bone section and analyzed using finite element method. Four loading types were tested on different dental implant designs; tension of 50 N, compression of 100 N, bending of 20 N, and torque of 2 Nm, to derive design curves. Better stress distribution on both spongy and cortical bone was noted with an increase in dental implant diameter and length. With the increase in dental implant side area, a stress reduction in the surrounding bones was observed, where threaded dental implants showed better behavior over the plain ones. Increasing value of ratio between dental implant side area and its cross-sectional area reduces stresses transferred to cortical and spongy bones. The use of implants with higher ratio of side area to cross-section area, especially with weak jaw bone, is recommended.

  3. Sub-meninges Implantation Reduces Immune Response to Neural Implants

    Science.gov (United States)

    Markwardt, Neil T.; Stokol, Jodi; Rennaker, Robert L.

    2013-01-01

    Glial scar formation around neural interfaces inhibits their ability to acquire usable signals from the surrounding neurons. To improve neural recording performance, the inflammatory response and glial scarring must be minimized. Previous work has indicated that meningeally derived cells participate in the immune response, and it is possible that the meninges may grow down around the shank of a neural implant, contributing to the formation of the glial scar. This study examines whether the glial scar can be reduced by placing a neural probe completely below the meninges. Rats were implanted with sets of loose microwire implants placed either completely below the meninges or implanted conventionally with the upper end penetrating the meninges, but not attached to the skull. Histological analysis was performed 4 weeks following surgical implantation to evaluate the glial scar. Our results found that sub-meninges implants showed an average reduction in reactive astrocyte activity of 63% compared to trans-meninges implants. Microglial activity was also reduced for sub-meninges implants. These results suggest that techniques that isolate implants from the meninges offer the potential to reduce the encapsulation response which should improve chronic recording quality and stability. PMID:23370311

  4. DEGRO/DGK guideline for radiotherapy in patients with cardiac implantable electronic devices

    Energy Technology Data Exchange (ETDEWEB)

    Gauter-Fleckenstein, Benjamin; Steil, Volker; Wenz, Frederik [Ruprecht-Karls-Universitaet Heidelberg, Klinik fuer Strahlentherapie und Radioonkologie, Universitaetsmedizin Mannheim, Mannheim (Germany); Israel, Carsten W. [Klinik fuer Innere Medizin - Kardiologie, Diabetologie und Nephrologie, Ev. Krankenhaus Bielefeld, Bielefeld (Germany); Dorenkamp, Marc [Charite - Universitaetsmedizin Berlin, Campus Virchow-Klinikum, Medizinische Klinik mit Schwerpunkt Kardiologie, Berlin (Germany); Dunst, Juergen [Universitaetsklinik Schleswig-Holstein, Campus Luebeck, Klinik fuer Strahlentherapie, Luebeck (Germany); Roser, Mattias [Charite - Universitaetsmedizin Berlin, Campus Benjamin Franklin, Medizinische Klinik fuer Kardiologie und Pulmologie, Berlin (Germany); Schimpf, Rainer [Ruprecht-Karls-Universitaet Heidelberg, I. Medizinische Klinik - Kardiologie, Universitaetsmedizin Mannheim, Heidelberg (Germany); Schaefer, Joerg [Strahlentherapie Speyer, Speyer (Germany); Hoeller, Ulrike [Charite Universitaetsmedizin Berlin, Campus Charite Mitte, Klinik fuer Radioonkologie und Strahlentherapie, Berlin (Germany)

    2015-05-01

    An increasing number of patients undergoing radiotherapy (RT) have cardiac implantable electronic devices [CIEDs, cardiac pacemakers (PMs) and implanted cardioverters/defibrillators (ICDs)]. Ionizing radiation can cause latent and permanent damage to CIEDs, which may result in loss of function in patients with asystole or ventricular fibrillation. Reviewing the current literature, the interdisciplinary German guideline (DEGRO/DGK) was developed reflecting patient risk according to type of CIED, cardiac condition, and estimated radiation dose to the CIED. Planning for RT should consider the CIED specifications as well as patient-related characteristics (pacing-dependent, previous ventricular tachycardia/fibrillation). Antitachyarrhythmia therapy should be suspended in patients with ICDs, who should be under electrocardiographic monitoring with an external defibrillator on stand-by. The beam energy should be limited to 6 (to 10) MV CIEDs should never be located in the beam, and the cumulative scatter radiation dose should be limited to 2 Gy. Personnel must be able to respond adequately in the case of a cardiac emergency and initiate basic life support, while an emergency team capable of advanced life support should be available within 5 min. CIEDs need to be interrogated 1, 3, and 6 months after the last RT due to the risk of latent damage. (orig.) [German] Strahlentherapie (RT) ist zunehmend haeufig bei Patienten mit kardialen implantierten elektronischen Geraeten (CIED; Herzschrittmacher [SM] und Kardioverter-Defibrillatoren [ICD]) indiziert. Durch ionisierende Strahlen koennen Schaeden und Fehlfunktionen des CIED auftreten, die einen permanenten Funktionsverlust beim Geraet und eine Asystolie oder Kammerflimmern beim Patienten ausloesen. Deshalb wurde vor dem Hintergrund der bisher verfuegbaren Daten eine interdisziplinaere Leitlinie (DEGRO/DGK) erarbeitet, die sich an der zu erwartenden Strahlendosis am CIED sowie dem kardialen Risiko des Patienten orientiert. In

  5. Implantation of the Subcutaneous Implantable Cardioverter-Defibrillator: An Evaluation of 4 Implantation Techniques.

    Science.gov (United States)

    Brouwer, Tom F; Miller, Marc A; Quast, Anne-Floor B E; Palaniswamy, Chandrasekar; Dukkipati, Srinivas R; Reddy, Vivek; Wilde, Arthur A; Willner, Jonathan M; Knops, Reinoud E

    2017-01-01

    Alternative techniques to the traditional 3-incision subcutaneous implantation of the subcutaneous implantable cardioverter-defibrillator may offer procedural and cosmetic advantages. We evaluate 4 different implant techniques of the subcutaneous implantable cardioverter-defibrillator. Patients implanted with subcutaneous implantable cardioverter-defibrillators from 2 hospitals between 2009 and 2016 were included. Four implantation techniques were used depending on physician preference and patient characteristics. The 2- and 3-incision techniques both place the pulse generator subcutaneously, but the 2-incision technique omits the superior parasternal incision for lead positioning. Submuscular implantation places the pulse generator underneath the serratus anterior muscle and subfascial implantation underneath the fascial layer on the anterior side of the serratus anterior muscle. Reported outcomes include perioperative parameters, defibrillation testing, and clinical follow-up. A total of 246 patients were included with a median age of 47 years and 37% female. Fifty-four patients were implanted with the 3-incision technique, 118 with the 2-incision technique, 38 with submuscular, and 37 with subfascial. Defibrillation test efficacy and shock lead impedance during testing did not differ among the groups; respectively, P=0.46 and P=0.18. The 2-incision technique resulted in the shortest procedure duration and time-to-hospital discharge compared with the other techniques (P<0.001). A total of 18 complications occurred, but there were no significant differences between the groups (P=0.21). All infections occurred in subcutaneous implants (3-incision, n=3; 2-incision, n=4). In the 2-incision group, there were no lead displacements. The presented implantation techniques are feasible alternatives to the standard 3-incision subcutaneous implantation, and the 2-incision technique resulted in shortest procedure duration. © 2017 American Heart Association, Inc.

  6. Ion Implantation In Optical Fibres

    Science.gov (United States)

    McStay, Daniel

    1989-10-01

    Some initial results on the implantation of single- and multi-mode optical fibres are described. Fibres are wound onto a bobin system for insertion into the implantation chamber. Long and short lengths of fibres as well as discrete elements along a fibre have been implanted. Refractive index changes of 5 x 10-3 have been produced in the fibres, leading to new guiding properties. A large dose dependent fluorescence and attenuation increase is also produced in the fibre.

  7. Dental implant infection and decontaimination

    OpenAIRE

    Mongra, Avtar Chander

    2012-01-01

    The ability of bacteria to adhere titanium implant surfaces has been confirmed in various studies. Elimination of bacteria from the implant surface is necessary in order to terminate the source of infection and disrupt the formation of bio-film. Biomaterial therapies using fibers, gels, and beads to deliver antibiotics have been used in the treatment of Peri-implantitis..There is possibility of development of recombinant protein using r -DNA technology and using the application of tissue engi...

  8. Current trends in dental implants

    OpenAIRE

    Gaviria, Laura; Salcido, John Paul; Guda, Teja; Ong, Joo L.

    2014-01-01

    Tooth loss is very a very common problem; therefore, the use of dental implants is also a common practice. Although research on dental implant designs, materials and techniques has increased in the past few years and is expected to expand in the future, there is still a lot of work involved in the use of better biomaterials, implant design, surface modification and functionalization of surfaces to improve the long-term outcomes of the treatment. This paper provides a brief history and evoluti...

  9. Immediate Direct-To-Implant Breast Reconstruction Using Anatomical Implants

    Directory of Open Access Journals (Sweden)

    Sung-Eun Kim

    2014-09-01

    Full Text Available BackgroundIn 2012, a new anatomic breast implant of form-stable silicone gel was introduced onto the Korean market. The intended use of this implant is in the area of aesthetic breast surgery, and many reports are promising. Thus far, however, there have been no reports on the use of this implant for breast reconstruction in Korea. We used this breast implant in breast reconstruction surgery and report our early experience.MethodsFrom November 2012 to April 2013, the Natrelle Style 410 form-stable anatomically shaped cohesive silicone gel-filled breast implant was used in 31 breasts of 30 patients for implant breast reconstruction with an acellular dermal matrix. Patients were treated with skin-sparing mastectomies followed by immediate breast reconstruction.ResultsThe mean breast resection volume was 240 mL (range, 83-540 mL. The mean size of the breast implants was 217 mL (range, 125-395 mL. Breast shape outcomes were considered acceptable. Infection and skin thinning occurred in one patient each, and hematoma and seroma did not occur. Three cases of wound dehiscence occurred, one requiring surgical intervention, while the others healed with conservative treatment in one month. Rippling did not occur. So far, complications such as capsular contracture and malrotation of breast implant have not yet arisen.ConclusionsBy using anatomic breast implants in breast reconstruction, we achieved satisfactory results with aesthetics better than those obtained with round breast implants. Therefore, we concluded that the anatomical implant is suitable for breast reconstruction.

  10. Transfer characteristics of subretinal visual implants: corneally recorded implant responses.

    Science.gov (United States)

    Stingl, K; Bartz-Schmidt, K U; Braun, A; Gekeler, F; Greppmaier, U; Schatz, A; Stett, A; Strasser, T; Kitiratschky, V; Zrenner, E

    2016-10-01

    The subretinal Alpha IMS visual implant is a CE-approved medical device for restoration of visual functions in blind patients with end-stage outer retina degeneration. We present a method to test the function of the implant objectively in vivo using standard electroretinographic equipment and to assess the devices' parameter range for an optimal perception. Subretinal implant Alpha IMS (Retina Implant AG, Reutlingen, Germany) consists of 1500 photodiode-amplifier-electrode units and is implanted surgically into the subretinal space in blind retinitis pigmentosa patients. The voltages that regulate the amplifiers' sensitivity (V gl) and gain (V bias), related to the perception of contrast and brightness, respectively, are adjusted manually on a handheld power supply device. Corneally recorded implant responses (CRIR) to full-field illumination with long duration flashes in various implant settings for brightness gain (V bias) and amplifiers' sensitivity (V gl) are measured using electroretinographic setup with a Ganzfeld bowl in a protocol of increasing stimulus luminances up to 1000 cd/m2. CRIRs are a meaningful tool for assessing the transfer characteristic curves of the electronic implant in vivo monitoring the implants' voltage output as a function of log luminance in a sigmoidal shape. Changing the amplifiers' sensitivity (V gl) shifts the curve left or right along the log luminance axis. Adjustment of the gain (V bias) changes the maximal output. Contrast perception is only possible within the luminance range of the increasing slope of the function. The technical function of subretinal visual implants can be measured objectively using a standard electroretinographic setup. CRIRs help the patient to optimise the perception by adjusting the gain and luminance range of the device and are a useful tool for clinicians to objectively assess the function of subretinal visual implants in vivo.

  11. Cochlear implant assessment: imaging issues

    Energy Technology Data Exchange (ETDEWEB)

    Marsot-Dupuch, K. E-mail: kathlyn.marsot-dupuch@bct.ap-hop-paris.fr; Meyer, B

    2001-11-01

    Cochlear implants are electronic auditory prostheses used to rehabilitate deafened persons who have lost their hair cells. They are partly worn externally and partly implanted in the ear. They provide a direct stimulation of the spiral ganglion cells of the cochlear nerve by bypassing the destroyed hair cells. The objectives of this article are to summarise what head and neck surgeons need to know before cochlear implantation and to describe the imaging study protocol used and anomalies to look for. A few explanations are resumed about placement of a brainstem implant.

  12. Antibacterial coatings on titanium implants.

    Science.gov (United States)

    Zhao, Lingzhou; Chu, Paul K; Zhang, Yumei; Wu, Zhifen

    2009-10-01

    Titanium and titanium alloys are key biomedical materials because of their good biocompatibility and mechanical properties. Nevertheless, infection on and around titanium implants still remains a problem which is usually difficult to treat and may lead to eventual implant removal. As a result, preventive measures are necessary to mitigate implant-frelated infection. One important strategy is to render the implant surface antibacterial by impeding the formation of a biofilm. A number of approaches have been proposed for this purpose and they are reviewed in this article. (c) 2009 Wiley Periodicals, Inc.

  13. Untreated silicone breast implant rupture

    DEFF Research Database (Denmark)

    Hölmich, Lisbet R; Vejborg, Ilse M; Conrad, Carsten

    2004-01-01

    were evaluated. Comparisons were also made for self-reported breast symptoms occurring during the study period and for changes in serum values of antinuclear antibodies, rheumatoid factor, and cardiolipin antibodies immunoglobulin G and immunoglobulin M. The majority of the women with implant rupture...... that implant rupture is a relatively harmless condition, which only rarely progresses and gives rise to notable symptoms. Even so, because of a small risk of silicone spread, the authors suggest that women with implant ruptures be followed clinically, if not operated on. Because implant ruptures often occur...

  14. Short-term CT findings after osteosynthesis of fractures of the vertebral spine; Kurzfristige Veraenderungen in der Computertomographie nach osteosynthetischer Versorgung von Wirbelsaeulenfrakturen

    Energy Technology Data Exchange (ETDEWEB)

    Schroeder, R.J.; Noor, J.; Herzog, H.; Roettgen, R.; Hidajat, N.; Felix, R. [Klinik fuer Strahlenheilkunde, Charite, Campus Virchow-Klinikum, Humboldt-Univ. zu Berlin (Germany); Klinik fuer Unfall- und Wiederherstellungschirurgie, Charite, Campus Virchow-Klinikum, Humboldt-Univ. zu Berlin (Germany); Pflugmacher, R.; Maeurer, J. [Radiologie am Prinzregentenplatz, Muenchen (Germany)

    2004-05-01

    Veraenderungen insbesondere degenerativer Art zu evaluieren. Material und Methode: Es wurden die prae- und postoperativen computertomographischen Untersuchungen von 55 Patienten (43 Maenner, 12 Frauen, Alter: 7 - 73 Jahre, x = 37,7 Jahre) mit traumatischen.Wirbelsaeulenfrakturen retrospektiv ausgewertet, welche mittels Fixateur-interne-Anlage operativ stabilisiert wurden. Der Abstand von der Operation zur ersten postoperativen CT-Nach-untersuchung betrug maximal eine Woche, zur kurzfristigen zweiten 6 bis 24 Monate (Mittelwert: 10,3 {+-} 2,7 Monate). Die von zwei Radiologen im Konsens erstellten Befunde der kurzfristigen postoperativen CT-Untersuchungen wurden mit den prae- und unmittelbar postoperativen CT-Befunden sowie den klinisch-neurologischen Befunden verglichen und statistisch mittels des Chi-Quadrat- oder des Fisher's-Exact-Tests analysiert. Ergebnisse: Es fand sich kein statistisch signifikanter Zusammenhang zwischen dem Patientenalter und dem Auftreten von Osteoporose, Spondylarthrose, Skoliose, Spondylolisthesis oder Bandscheibenveraenderungen nach posttraumatischer operativer Stabilisierung mittels eines Fixateurs interne (p > 0,05). Ebenfalls ergab sich keine statistisch nachweisbare Abhaengigkeit zwischen der Frakturart, Frakturlokalisation, dem Bestehen eines Polytraumas, dem Operationsweg oder der angewandten Instrumentierung und dem Auftreten einer postoperativen degenerativen Veraenderung an den angrenzenden Segmenten. Ein Hinweis, dass eine Mehrsegmentstabilisierung oder mehrere vorangegangene Wirbelsaeulenoperationen fuer Degenerationen praedestinieren, wurde in der vorliegenden Arbeit nicht gefunden (p > 0,05). Als einziger Risikofaktor erwies sich das Vorliegen einer Rotationsberstungsfraktur vom Typ C1.3, bei der es vermehrt zu einer postoperativen skoliotischen Fehlhaltung bei allerdings nur geringer Fallzahl in dieser Gruppe kam. (orig.)

  15. Age at implantation and auditory memory in cochlear implanted children.

    Science.gov (United States)

    Mikic, B; Miric, D; Nikolic-Mikic, M; Ostojic, S; Asanovic, M

    2014-05-01

    Early cochlear implantation, before the age of 3 years, provides the best outcome regarding listening, speech, cognition an memory due to maximal central nervous system plasticity. Intensive postoperative training improves not only auditory performance and language, but affects auditory memory as well. The aim of this study was to discover if the age at implantation affects auditory memory function in cochlear implanted children. A total of 50 cochlear implanted children aged 4 to 8 years were enrolled in this study: early implanted (1-3y) n = 27 and late implanted (4-6y) n = 23. Two types of memory tests were used: Immediate Verbal Memory Test and Forward and Backward Digit Span Test. Early implanted children performed better on both verbal and numeric tasks of auditory memory. The difference was statistically significant, especially on the complex tasks. Early cochlear implantation, before the age of 3 years, significantly improve auditory memory and contribute to better cognitive and education outcomes.

  16. Zirconia dental implants: a literature review

    National Research Council Canada - National Science Library

    Özkurt, Zeynep; Kazazoğlu, Ender

    2011-01-01

    Titanium and titanium alloys are widely used for fabrication of dental implants. Because of potential immunologic and possible esthetic compromises with titanium implants, novel implant technologies are being developed...

  17. Untreated silicone breast implant rupture.

    Science.gov (United States)

    Hölmich, Lisbet R; Vejborg, Ilse M; Conrad, Carsten; Sletting, Susanne; Høier-Madsen, Mimi; Fryzek, Jon P; McLaughlin, Joseph K; Kjøller, Kim; Wiik, Allan; Friis, Søren

    2004-07-01

    Implant rupture is a well-known complication of breast implant surgery that can pass unnoticed by both patient and physician. To date, no prospective study has addressed the possible health implications of silicone breast implant rupture. The aim of the present study was to evaluate whether untreated ruptures are associated with changes over time in magnetic resonance imaging findings, serologic markers, or self-reported breast symptoms. A baseline magnetic resonance imaging examination was performed in 1999 on 271 women who were randomly chosen from a larger cohort of women having cosmetic breast implants for a median period of 12 years (range, 3 to 25 years). A follow-up magnetic resonance imaging examination was carried out in 2001, excluding women who underwent explantation in the period between the two magnetic resonance imaging examinations (n = 44). On the basis of these examinations, the authors identified 64 women who had at least one ruptured implant at the first magnetic resonance imaging examination and, for comparison, all women who had intact implants at both examinations (n = 98). Magnetic resonance images from the two examinations were compared and changes in rupture configuration were evaluated. Comparisons were also made for self-reported breast symptoms occurring during the study period and for changes in serum values of antinuclear antibodies, rheumatoid factor, and cardiolipin antibodies immunoglobulin G and immunoglobulin M. The majority of the women with implant rupture had no visible magnetic resonance imaging changes of their ruptured implants. For 11 implants (11 percent) in 10 women, the authors observed progression of silicone seepage, either as a conversion from intracapsular into extracapsular rupture (n = 7), as progression of extra-capsular silicone (n = 3), or as increasing herniation of the silicone within the fibrous capsule (n = 1); however, in most cases, these changes were minor. Some changes could be ascribed to trauma, but

  18. Piezosurgery in implant dentistry

    Directory of Open Access Journals (Sweden)

    Stübinger S

    2015-11-01

    Full Text Available Stefan Stübinger,1 Andres Stricker,2 Britt-Isabelle Berg3,4 1Hightech Research Center of Cranio-maxillofacial Surgery, University of Basel, Allschwil, Switzerland; 2Private Practice, Konstanz, Germany; 3Department of Cranio-maxillofacial Surgery, University Hospital Basel, Basel, Switzerland; 4Division of Oral and Maxillofacial Radiology, Columbia University Medical Center, New York, NY, USA Abstract: Piezosurgery, or the use of piezoelectric devices, is being applied increasingly in oral and maxillofacial surgery. The main advantages of this technique are precise and selective cuttings, the avoidance of thermal damage, and the preservation of soft-tissue structures. Through the application of piezoelectric surgery, implant-site preparation, bone grafting, sinus-floor elevation, edentulous ridge splitting or the lateralization of the inferior alveolar nerve are very technically feasible. This clinical overview gives a short summary of the current literature and outlines the advantages and disadvantages of piezoelectric bone surgery in implant dentistry. Overall, piezoelectric surgery is superior to other methods that utilize mechanical instruments. Handling of delicate or compromised hard- and soft-tissue conditions can be performed with less risk for the patient. With respect to current and future innovative surgical concepts, piezoelectric surgery offers a wide range of new possibilities to perform customized and minimally invasive osteotomies. Keywords: implantology, piezoelectric device, piezosurgery, maxillary sinus elevation, bone grafting, osteotomy, edentulous ridge splitting

  19. Sequential provisional implant prosthodontics therapy.

    Science.gov (United States)

    Zinner, Ira D; Markovits, Stanley; Jansen, Curtis E; Reid, Patrick E; Schnader, Yale E; Shapiro, Herbert J

    2012-01-01

    The fabrication and long-term use of first- and second-stage provisional implant prostheses is critical to create a favorable prognosis for function and esthetics of a fixed-implant supported prosthesis. The fixed metal and acrylic resin cemented first-stage prosthesis, as reviewed in Part I, is needed for prevention of adjacent and opposing tooth movement, pressure on the implant site as well as protection to avoid micromovement of the freshly placed implant body. The second-stage prosthesis, reviewed in Part II, should be used following implant uncovering and abutment installation. The patient wears this provisional prosthesis until maturation of the bone and healing of soft tissues. The second-stage provisional prosthesis is also a fail-safe mechanism for possible early implant failures and also can be used with late failures and/or for the necessity to repair the definitive prosthesis. In addition, the screw-retained provisional prosthesis is used if and when an implant requires removal or other implants are to be placed as in a sequential approach. The creation and use of both first- and second-stage provisional prostheses involve a restorative dentist, dental technician, surgeon, and patient to work as a team. If the dentist alone cannot do diagnosis and treatment planning, surgery, and laboratory techniques, he or she needs help by employing the expertise of a surgeon and a laboratory technician. This team approach is essential for optimum results.

  20. NEGATIVE IMPLANT - A RETROSPECTIVE STUDY

    NARCIS (Netherlands)

    LANDESZ, M; WORST, JGF; SIERTSEMA, JV; VANRIJ, G

    1993-01-01

    Implantation of a negative power intraocular lens is one of the options for surgical correction of high myopia. We studied 36 eyes with a Fechner Worst Claw Lens, implanted in Groningen between March 1987 and November 1991. The preoperative myopia ranged from -7.00 to -30.00 diopters. Twentyone eyes

  1. Porous metal for orthopedics implants

    OpenAIRE

    Matassi, Fabrizio; Botti, Alessandra; Sirleo, Luigi; Carulli, Christian; Innocenti, Massimo

    2013-01-01

    Porous metal has been introduced to obtain biological fixation and improve longevity of orthopedic implants. The new generation of porous metal has intriguing characteristics that allows bone healing and high osteointegration of the metallic implants. This article gives an overview about biomaterials properties of the contemporary class of highly porous metals and about the clinical use in orthopaedic surgery.

  2. Pyoderma gangrenosum complicating pacemaker implant.

    Science.gov (United States)

    Cosío, Francisco G; Herrada, Carlos González; Monereo, Alfonso; Pastor, Agustín; Núñez, Ambrosio

    2006-12-01

    A 70-year-old lady with diabetes and monoclonal gammopathy underwent pacemaker implant for 2:1 atrioventricular block. Within 7 days, a painful, infiltrating, necrotic lesion involved the implant area. Biopsy was compatible with pyoderma gangrenosum and corticosteroid treatment led to healing in 3 weeks.

  3. [The impact of dental implants

    NARCIS (Netherlands)

    Meijer, G.J.

    2013-01-01

    The importance of the introduction of dental implants can only be understood when the historical context is clarified. In the past, the main treatment carried out by dentists consisted of filling or, in unfortunate cases, removal of painful teeth. Only since the introduction of dental implants did

  4. Regenerative Surgical Treatment of Peri-implantitis

    Science.gov (United States)

    2016-08-31

    Failure of Dental Implant Due to Infection; Infection; Inflammation; Peri-implantitis; Bacterial Infections; Bleeding of Subgingival Space; Molecular Sequence Variation; Periodontal Diseases; Mouth Diseases

  5. Radiation dose reduction in digital plain radiography of the knee after total knee arthroplasty; Dosisreduktion in der digitalen Radiografie des Kniegelenkes nach endoprothetischem Gelenkersatz

    Energy Technology Data Exchange (ETDEWEB)

    Kloth, J.K.; Kauczor, H.U.; Weber, M.A. [University Hospital Heidelberg (Germany). Clinic for Diagnostic and Interventional Radiology; Tanner, M.; Ewerbeck, V. [University Hospital Heidelberg (Germany). Center of Orthopedics, Trauma and Spinal Cord Injury; Stiller, W. [German Cancer Research Center (DKFZ), Radiology (E010), Heidelberg (Germany); Burkholder, I. [Univ. of Applied Sciences of the Saarland, Dept. of Nursing and Health, Saarbruecken (Germany)

    2015-08-15

    To reduce radiation exposure of frequently performed radiographs of the knee in follow-up of total-knee arthroplasty ensuring accurate assessment by using objective quality control criteria. In this prospective randomized study 278 radiographs of the knee in follow-up of total-knee arthroplasty were performed with standard and 37 % reduced radiation dose. The evaluation of the plain-radiographs was conducted using the following criteria: bone-implant interface, implant-surface character, implant-implant discrimination and periarticular heterotopic ossification. Two radiologists evaluated these criteria using a score ranging from 1 (definitely assessable) to 4 (not assessable). If a single criterion had been evaluated with a score ≥ 3 or more than 2 criteria with ≥ 2 points, the radiograph was score das ''not assessable''. The study was designed as non-inferiority-trial. 100 % of examined radiographs were scored as assessable, hence no statistical inferiority between the examinations with standard and reduced dose could be observed. Singular assessment of the defined criteria was likewise dose-independent. Plain-radiography of the knee following total-knee arthroplasty can be performed with 63 % of standard dose without loss of diagnostic validity.

  6. [Dental implants in tooth grinders].

    Science.gov (United States)

    Lobbezoo, F; Brouwers, J E; Cune, M S; Naeije, M

    2004-03-01

    Bruxism (tooth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly due to the large variation in the technical and the biological aspects of the investigations. Although there is still no proof that bruxism causes overload of dental implants and their suprastructures, a careful approach is recommended. Practical advices as to minimize the chance of implant failure are given. Besides the recommendation to reduce or eliminate bruxism itself, these advices concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the use of a hard nightguard.

  7. Salvage of Infected Breast Implants

    Directory of Open Access Journals (Sweden)

    Joon Ho Song

    2017-11-01

    Full Text Available Background Implant-based breast reconstruction is being performed more frequently, and implants are associated with an increased risk of infection. We reviewed the clinical features of cases of implant infection and investigated the risk factors for breast device salvage failure. Methods We retrospectively analyzed 771 patients who underwent implant-based breast reconstruction between January 2010 and December 2016. Age, body mass index, chemotherapy history, radiation exposure, and smoking history were assessed as potential risk factors for postoperative infection. We also evaluated the presence and onset of infection symptoms, wound culture pathogens, and other complications, including seroma, hematoma, and mastectomy skin necrosis. Additionally, we examined the mastectomy type, the use of acellular dermal matrix, the presence of an underlying disease such as hypertension or diabetes, and axillary node dissection. Results The total infection rate was 4.99% (58 of 1,163 cases and the total salvage rate was 58.6% (34 of 58. The postoperative duration to closed suction drain removal was significantly different between the cellulitis and implant removal groups. Staphylococcus aureus infection was most frequently found, with methicillin resistance in 37.5% of the cases of explantation. Explantation after infection was performed more often in patients who had undergone 2-stage expander/implant reconstruction than in those who had undergone direct-to-implant reconstruction. Conclusions Preventing infection is essential in implant-based breast reconstruction. The high salvage rate argues against early implant removal. However, when infection is due to methicillin-resistant S. aureus and the patient’s clinical symptoms do not improve, surgeons should consider implant removal.

  8. 3D CISS, 3D MP-PAGE and 2D TSE for MRI prior to Cochlear implantation; 3D CISS, 3D MP-RAGE und 2D TSE fuer die praeoperative MRT vor Cochlea Implant

    Energy Technology Data Exchange (ETDEWEB)

    Seitz, J.; Held, P.; Voelk, M.; Lenhart, M.; Strotzer, M. [Klinikum der Univ. Regensburg (Germany). Inst. fuer Roentgendiagnostik; Waldeck, A. [Klinikum der Univ. Regensburg (Germany). Klinik und Poliklinik fuer Hals-Nasen-Ohrenheilkunde

    2000-03-01

    Purpose: The aim of this study was to determine the presurgical predictive value of high resolution MRI in patients scheduled for chochlear implantation. Method and material: The presurgical MRI (3D CISS, 3D MP-RAGE with and without i.v. contrast medium, 2D TSE) findings of 54 patients and the intraoperative situation reported by the surgeon were compared retrospectively. The surgical and functional success of the cochlear implantation was evaluated. Results: We found a high degree of correlation between MRI and intraoperative findings concerning the patency of the whole cochlea and anomalies as well as in the diagnosis of pathology of the cochlear, vestibular and facial nerves and in anomalies of the internal auditory canal. However, in four out of 54 patients there was a false negative prediction regarding the patency of the cochlea. The sensitivity was 50% (4/8), the specificity 100% (46/46). Concerning the surgical success the accuracy was 100%. In all patients MRI gave sufficient anatomical information to the surgeon concerning the jugular bulb and the facial nerve. Conclusion: A high-resolution MRI protocol consisting of coronal 2D T2w TSE, 3D T2*w transverse CISS; plain and contrast enhanced sagittal T1w 3D MP-RAGE is recommended for the evaluation of candidates scheduled for cochlear implantation. (orig.) [German] Ziel: Das Ziel dieser Studie war, den praeoperativen Vorhersagewert der hochaufloesenden MRT bei Patienten, welche fuer ein Cochlea Implant vorgesehen sind, zu ermitteln. Material und Methode: Die praeoperativen Befunde der MRT (3D CISS, 3D MP-RAGE vor und nach i.v. Gabe von Gadolinium, 2D TSE) von 54 Patienten und die vom Operateur vorgefundenen intraoperativen Verhaeltnisse wurden verglichen. Sowohl der chirurgische Erfolg der Implantation als auch die Funktion des Cochlea Implants wurden evaluiert. Ergebnisse: Es zeigte sich eine hohe Uebereinstimmung der MRT-Befunde sowie der intraoperativ vorgefundenen Situation bezueglich der Offenheit der

  9. Pre implantation psychological functioning preserved in majority of implantable cardioverter defibrillator patients 12 months post implantation

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; Hoogwegt, Madelein T; Jordaens, Luc

    2013-01-01

    The impact of ICD therapy on patient well being has typically focused on mean differences between groups, thereby neglecting changes within individuals. Using an intra-individual approach, we examined (i) the prevalence of implantable cardioverter defibrillator (ICD) patients maintaining their pr...... implantation level of psychological functioning at 12 months, and (ii) factors associated with deterioration in functioning....

  10. Protocol for mandibular reconstruction with zygomatic implants (zygomatic mandibular implant).

    Science.gov (United States)

    Muñoz, Ruben; Gajos, Golaszewski; Bladimir, Jose; Carvajal, Diaz; Luis, Alvaro; Del Valle Speranza, Grace

    2017-10-28

    This study describes a modified protocol using transmandibular zygomatic implants with immediate occlusal loading for the comprehensive dental rehabilitation of previously reconstructed mandibular defects and reports preliminary results of this modified protocol. Fifteen patients (6 female and 9 male), with a mean of age 40.26 years (range 12 to 68 years), had previously undergone immediate mandibular reconstruction using either autologous bone grafting, bone transport, or microvascular free-flap reconstruction for a variety of diagnoses. Transmandibular zygomatic implants were subsequently placed, depending on the type of defect. Implant stability was evaluated by insertion torque, percussion testing, and the implant stability quotient (ISQ). The patients were rehabilitated with an immediate provisional prosthesis. All patients' records included pre and postoperative clinical examination, radiographs, CT scan, and photographic analysis. All patients were followed for a minimum of 36 months. All patients were dentally rehabilitated immediately with functional and esthetic hybrid dentures based on either acrylic or porcelain on a metal framework. Among all cases of transmandibular zygomatic implants, the ISQ was greater than 75, which allowed immediate prosthetic loading. The zygomatic implants were considered to be successful if they were asymptomatic with no clinical mobility and no sign of infection. We have also added new indications for placement of transmandibular implants in cases of sequelae of gunshot trauma, dentoalveolar defects, and complications of orthognathic surgery, partially edentulous and/or failure of prior mandibular reconstruction. The zygomatic implant is an excellent immediate loading option for mandibular dental rehabilitation among patients with mandibular defects. According to our observation, immediate occlusal loading of transmandibular zygomatic implants has a very good potential for success.

  11. [Annemarie Stiedl. Auf nach Wien! Die mobilität des mitteleuropäischen Handwerks im 18. und 19. Jahrhundert am Beispiel der Haupt- und Residenzstadt] / Raimo Pullat

    Index Scriptorium Estoniae

    Pullat, Raimo, 1935-

    2009-01-01

    Arvustus: Stiedl, Annemarie. Auf nach Wien! Die mobilität des mitteleuropäischen Handwerks im 18. und 19. Jahrhundert am Beispiel der Haupt- und Residenzstadt. Sozail- und wirtschaftshistorische Studien. Bd. 30. Wien, 2003. Teose põhisisu moodustab 18. ja 19. sajandi linnakäsitööliste rände ruumiliste muutuste ja nihete jälgimine. Autor on võtnud vaatluse alla peamiselt neli käsitööametit : lihunikud, korstnapühkijad, siidist asjakeste valmistajad ning nahast kottide ja mappide valmistajad

  12. Die Beurteilung der Wirksamkeit der BEMER-Therapie bei der körperlichen Regeneration nach dem Ausdauertraining. Case study = The evaluation of the efficacy of BEMER therapy in the physical recovery after endurance training

    OpenAIRE

    Mrozkowiak, Mirosław

    2016-01-01

    Mrozkowiak Mirosław. Die Beurteilung der Wirksamkeit der BEMER-Therapie bei der körperlichen Regeneration nach dem Ausdauertraining. Case study = The evaluation of the efficacy of BEMER therapy in the physical recovery after endurance training. Case study. Journal of Education, Health and Sport. 2016;6(4):399-428. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.50580 http://ojs.ukw.edu.pl/index.php/johs/article/view/3493   The journal has had 7 points in Ministry of Science ...

  13. Implant-supported full-mouth reconstruction Malo Implant Bridge.

    Science.gov (United States)

    Kodama, Taishi

    2012-06-01

    This article describes the clinical techniques and laboratory procedures for fabricating a predictable Malo Implant Bridge involving application of an occlusal screw-retained implant superstructure on the basis of the All-on-4 concept. The Malo Implant Bridge features a removable occlusal screw-retained superstructure; fabrication of the framework with a computer-aided design/computer-aided manufacturing system allowing accurate adaptation; and use of the final tooth position model with guide temporary crowns allowing easy porcelain build-up and satisfying the patient's esthetic concerns.

  14. Effect of implant surface properties on peri-implant bone healing: implant stability and microcomputed tomographic analysis.

    NARCIS (Netherlands)

    Al-Hamdan, S.H.; Al-Hamdan, K.; Junker, R.; Jansen, J.A.

    2012-01-01

    PURPOSE: The present study aimed to evaluate and compare two types of implants: grit-blasted and acidetched implants (SLActive) and nanometer-scale hydroxyapatite-modified implants (NanoTite). MATERIALS AND METHODS: Twenty-two SLActive and 22 NanoTite implants were inserted into the mandibles of 11

  15. Implantable, multifunctional, bioresorbable optics

    Science.gov (United States)

    Tao, Hu; Kainerstorfer, Jana M.; Siebert, Sean M.; Pritchard, Eleanor M.; Sassaroli, Angelo; Panilaitis, Bruce J. B.; Brenckle, Mark A.; Amsden, Jason J.; Levitt, Jonathan; Fantini, Sergio; Kaplan, David L.; Omenetto, Fiorenzo G.

    2012-01-01

    Advances in personalized medicine are symbiotic with the development of novel technologies for biomedical devices. We present an approach that combines enhanced imaging of malignancies, therapeutics, and feedback about therapeutics in a single implantable, biocompatible, and resorbable device. This confluence of form and function is accomplished by capitalizing on the unique properties of silk proteins as a mechanically robust, biocompatible, optically clear biomaterial matrix that can house, stabilize, and retain the function of therapeutic components. By developing a form of high-quality microstructured optical elements, improved imaging of malignancies and of treatment monitoring can be achieved. The results demonstrate a unique family of devices for in vitro and in vivo use that provide functional biomaterials with built-in optical signal and contrast enhancement, demonstrated here with simultaneous drug delivery and feedback about drug delivery with no adverse biological effects, all while slowly degrading to regenerate native tissue. PMID:23150544

  16. Silicone breast implants: complications.

    Science.gov (United States)

    Iwuagwu, F C; Frame, J D

    1997-12-01

    Silicone breast implants have been used for augmentation mammoplasty for cosmetic purposes as well as for breast reconstruction following mastectomy for more than three decades. Though the use of the silicone gel filled variety has been banned in the USA except for special cases, they continue to be available elsewhere in the world including the UK. Despite the immense benefit they provide, their usage is associated with some complications. Most of these are related to the surgery and can be reduced by good surgical management. The major complications associated with their use is adverse capsular contracture, an outcome which can be very frustrating to manage. This article reviews the commonly reported complications and suggested management alternatives.

  17. Implant materials modified by colloids

    Directory of Open Access Journals (Sweden)

    Zboromirska-Wnukiewicz Beata

    2016-03-01

    Full Text Available Recent advances in general medicine led to the development of biomaterials. Implant material should be characterized by a high biocompatibility to the tissue and appropriate functionality, i.e. to have high mechanical and electrical strength and be stable in an electrolyte environment – these are the most important properties of bioceramic materials. Considerations of biomaterials design embrace also electrical properties occurring on the implant-body fluid interface and consequently the electrokinetic potential, which can be altered by modifying the surface of the implant. In this work, the surface of the implants was modified to decrease the risk of infection by using metal colloids. Nanocolloids were obtained using different chemical and electrical methods. It was found that the colloids obtained by physical and electrical methods are more stable than colloids obtained by chemical route. In this work the surface of modified corundum implants was investigated. The implant modified by nanosilver, obtained by electrical method was selected. The in vivo research on animals was carried out. Clinical observations showed that the implants with modified surface could be applied to wounds caused by atherosclerotic skeleton, for curing the chronic and bacterial inflammations as well as for skeletal reconstruction surgery.

  18. COCHLEAR IMPLANTATION PREVALENCE IN ELDERLY

    Directory of Open Access Journals (Sweden)

    A. V. Starokha

    2014-01-01

    Full Text Available Current paper describes an experience of cochlear implantation in elderly. Cochlear implantation has become a widely accepted intervention in the treatment of individuals with severe-to-profound sensorineural hearing loss. Cochlear implants are now accepted as a standard of care to optimize hearing and subsequent speech development in children and adults with deafness. But cochlear implantation affects not only hearing abilities, speech perception and speech production; it also has an outstanding impact on the social life, activities and self-esteem of each patient. The aim of this study was to evaluate the cochlear implantation efficacy in elderly with severe to profound sensorineural hearing loss. There were 5 patients under our observation. Surgery was performed according to traditional posterior tympanotomy and cochleostomy for cochlear implant electrode insertion for all observed patients. The study was conducted in two stages: before speech processor’s activation and 3 months later. Pure tone free field audiometry was performed to each patient to assess the efficiency of cochlear implantation in dynamics. The aim of the study was also to evaluate quality of life in elderly with severe to profound sensorineural hearing loss after unilateral cochlear implantation. Each patient underwent questioning with 36 Item Short Form Health Survey (SF-36. SF-36 is a set of generic, coherent, and easily administered quality-of-life measures. The SF-36 consists of eight scaled scores, which are the weighted sums of the questions in their section. Each scale is directly transformed into a 0-100 scale on the assumption that each question carries equal weight. The eight sections are: physical functioning; physical role functioning; emotional role functioning; vitality; emotional well-being; social role functioning; bodily pain; general health perceptions. Our results demonstrate that cochlear implantation in elderly consistently improved quality of life

  19. Implantes cortos. Reporte de treinta implantes. Parte I: oseointegtacion

    National Research Council Canada - National Science Library

    Arismendi, Jorge Alberto; Cabrales, Manuel; Castaneda, Wilmer; Duque, Jaiver Andres

    2011-01-01

    Introduccion: este reporte clinico pretende presentar los resultados obtenidos con un sistema de implantes que modifica el protocolo convencional quirurgico en cuanto a las revoluciones de fresado, no uso...

  20. Implantable cardioverter defibrillator implantation in children in The Netherlands

    NARCIS (Netherlands)

    ten Harkel, A. Derk Jan; Blom, Nico A.; Reimer, Annette G.; Tukkie, Raymond; Sreeram, Narayanswami; Bink-Boelkens, Margreet T. E.

    2005-01-01

    To evaluate the indications, underlying cardiac disorders, efficacy and complications involved with implantable cardioverter-defibrillators (ICDs) in paediatric patients in The Netherlands, the records of all patients aged 18 years or younger who underwent ICD placement were reviewed

  1. Implantable cardioverter defibrillator implantation in children in The Netherlands.

    NARCIS (Netherlands)

    Harkel, A.D. Ten; Blom, N.A.; Reimer, A.G.; Tukkie, R.; Sreeram, N.; Bink-Boelkens, M.T.

    2005-01-01

    To evaluate the indications, underlying cardiac disorders, efficacy and complications involved with implantable cardioverter-defibrillators (ICDs) in paediatric patients in The Netherlands, the records of all patients aged 18 years or younger who underwent ICD placement were reviewed

  2. Implantable cardioverter defibrillator implantation in children in The Netherlands

    NARCIS (Netherlands)

    Ten Harkel, ADJ; Blom, NA; Reimer, AG; Tukkie, R; Sreeram, N; Bink-Boelkens, MTE

    To evaluate the indications, underlying cardiac disorders, efficacy and complications involved with implantable cardioverter-defibrillators (ICDs) in paediatric patients in The Netherlands, the records of all patients aged 18 years or younger who underwent ICD placement were reviewed

  3. "Dental implant radiology" - Emerging concepts in planning implants

    Directory of Open Access Journals (Sweden)

    Amara Swapna Lingam

    2013-01-01

    Full Text Available Dental radiology has long played an exciting and critical diagnostic role in dentistry. This has been never truer than now with the rapidly expanding array of imaging modalities. Radiography offers the sole method of (non-surgical analysis of bone required for implant therapy. The choice of when to image, along with which imaging modality to use, depends on a combination of factors including determination of the bone quality and quantity to establish the most favorable position of implant placement, detection of the presence or absence of pathoses and accessibility at a reasonable cost to the patient. In addition, exposing patients to radiation dose as low as reasonably achievable should always be considered when selecting radiographic examinations. This article, reviews the current concepts on implant planning using different radiographic techniques and their applicability to facilitate the clinician′s work in successful implant placement.

  4. Cluster Implantation and Deposition Apparatus

    DEFF Research Database (Denmark)

    Hanif, Muhammad; Popok, Vladimir

    2015-01-01

    In the current report, a design and capabilities of a cluster implantation and deposition apparatus (CIDA) involving two different cluster sources are described. The clusters produced from gas precursors (Ar, N etc.) by PuCluS-2 can be used to study cluster ion implantation in order to develop...... contributions to the theory of cluster stopping in matter as well as for practical applications requiring ultra-shallow implantation and modification of surfaces on the nanoscale. Metal clusters from the magnetron cluster source are of interest for the production of optical sensors to detect specific biological...

  5. PRÓTESIS AUDITIVAS IMPLANTABLES

    Directory of Open Access Journals (Sweden)

    Dra. Gloria Ribalta

    2016-11-01

    Los implantes cocleares siguen siendo las más usadas y en las que se tiene mayor experiencia. Las prótesis de conducción ósea implantables o semi implantables cambiaron el manejo de las atresias y malformaciones de oído externo y medio. Pese a lo prometedor que se visualiza el presente y futuro con el uso de estos dispositivos, siempre se debe tener presente que requieren de un acto quirúrgico para su implantación y que no están exentas de complicaciones, por lo cual se debe elegir juiciosamente la prótesis a usar.

  6. Die Jagd nach dem Allerkleinsten

    CERN Multimedia

    Wolter, Uwe

    2006-01-01

    Only with probes and telescopes scientists do not explore the universe. To understand the processes in the cosmos, researchers feign Big Bang in gigantic devices and look with extremely sensitive detectors for the most elementary particles (1 page)

  7. Die Suche nach den Gottesteilchen

    CERN Multimedia

    2007-01-01

    2008 wird der größte jemals gebaute Teilchenbeschleuniger in Betrieb genommen Anlässlich des Mathematik-Jahres 2008 hat der Experimentalphysiker der Universität Hamburg und der designierte Generaldirektor des europäischen Zentrums für Teilchenphysik CERN in Genf, Rolf-Dieter Heuer, die Bedeutung des Dialogs zwischen Naturwissenschaftlern und Philosophen hervorgehoben.

  8. 21 CFR 522.1350 - Melatonin implant.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Melatonin implant. 522.1350 Section 522.1350 Food... Melatonin implant. (a) Specifications. The drug is a silicone rubber elastomer implant containing 2.7...—(1) Amount. One implant per mink. (2) Indications for use. For use in healthy male and female kit and...

  9. An introduction to single implant abutments.

    LENUS (Irish Health Repository)

    Warreth, Abdulhadi

    2013-01-01

    This article is an introduction to single implant abutments and aims to provide basic information about abutments which are essential for all dental personnel who are involved in dental implantology. Clinical Relevance: This article provides a basic knowledge of implants and implant abutments which are of paramount importance, as replacement of missing teeth with oral implants has become a well-established clinical procedure.

  10. Immediate implant loading: A case report

    OpenAIRE

    Dhamankar, Dilip; Gupta, Arun R.; Mahadevan, Janani

    2010-01-01

    Dental implants have long provided an excellent treatment option to restore edentulous spaces. Successful formation of a direct bone to implant interface is the goal in implant therapy. Immediate loading is an alternative to two stage surgical procedure. Improved surgical instrumentation implants design, and surface topography changes the concept of two stages surgical to one stage surgical procedure.

  11. Occlusion on oral implants: current clinical guidelines.

    Science.gov (United States)

    Koyano, K; Esaki, D

    2015-02-01

    Proper implant occlusion is essential for adequate oral function and the prevention of adverse consequences, such as implant overloading. Dental implants are thought to be more prone to occlusal overloading than natural teeth because of the loss of the periodontal ligament, which provides shock absorption and periodontal mechanoreceptors, which provide tactile sensitivity and proprioceptive motion feedback. Although many guidelines and theories on implant occlusion have been proposed, few have provided strong supportive evidence. Thus, we performed a narrative literature review to ascertain the influence of implant occlusion on the occurrence of complications of implant treatment and discuss the clinical considerations focused on the overloading factors at present. The search terms were 'dental implant', 'dental implantation', 'dental occlusion' and 'dental prosthesis'. The inclusion criteria were literature published in English up to September 2013. Randomised controlled trials (RCTs), prospective cohort studies and case-control studies with at least 20 cases and 12 months follow-up interval were included. Based on the selected literature, this review explores factors related to the implant prosthesis (cantilever, crown/implant ratio, premature contact, occlusal scheme, implant-abutment connection, splinting implants and tooth-implant connection) and other considerations, such as the number, diameter, length and angulation of implants. Over 700 abstracts were reviewed, from which more than 30 manuscripts were included. We found insufficient evidence to establish firm clinical guidelines for implant occlusion. To discuss the ideal occlusion for implants, further well-designed RCTs are required in the future. © 2014 John Wiley & Sons Ltd.

  12. Immediate loading implants: a clinical report of 1301 implants.

    Science.gov (United States)

    Hruska, Arturo; Borelli, Paolo; Bordanaro, Assia Chiaramonte; Marzaduri, Eleonora; Hruska, Kurt-Lorenzo

    2002-01-01

    The purpose of this study is to suggest 4 immediate load of implants techniques that are alternative and/or complementary to the traditional submersion technique. These techniques meet the criteria for implant immobilization during the entire period of osteointegration, and are based on the principles of splinting and load sharing. One hundred fifty-three maxillary and 309 mandibular arches were treated with 1301 implants. Only implants that satisfied the primary retention were immediately loaded with a provisional crown with wings (94), provisional plastic prosthesis (478), provisional plastic prosthesis with metal frame (293), and intraoral welding (436). Facies morphology, type of occlusion, size and function of the tongue, bone density, number, and length of implants appeared to have an influence on the results. Success rates achieved over 21 years are 99.3% with the intraoral welding machine, 98.3% with the provisional plastic prosthesis with metal frame, 97.9% with metal wings, and 88.02% with provisional plastic prosthesis. This last percentage is reflective of the years 1974 to 1984 when only blade-forms and root-forms with unscrewable abutments were available and a provisional plastic prosthesis was the only immobilization technique known. Guidelines are proposed for a treatment plan indicating when and why immediate loading implants can be suggested.

  13. Rapid implant therapies: immediate implant placement and immediate restoration

    Directory of Open Access Journals (Sweden)

    Yu-Lin Lai

    2009-03-01

    Full Text Available During the last decade, the effectiveness of implant therapy has greatly improved, and the demands of dental esthetics in implant dentistry have become an important issue. The traditional two-stage implant protocol with delayed restoration has a treatment duration of 1–2 years, in which patients had to wear a removable appliance and experienced significant discomfort during the recovery period. Nowadays, immediate implant placement into an extraction site followed by immediate restoration of a dental implant can shorten the dental rehabilitation time and preserve patients' esthetic appearance at all stages of treatment. However, these treatment protocols always pose a great challenge to clinicians, especially when treating patients with preexisting soft and hard tissue deficiencies. The aim of this report is to present various treatment modalities to provide immediate tissue reconstruction and implant restoration following tooth extraction. With appropriate patient selection and careful clinical planning, these treatment strategies can lessen the number of surgeries required, condense treatment times, reduce discomfort to the patient, and accelerate the restoration process.

  14. Complications of cochlear implant surgery

    Directory of Open Access Journals (Sweden)

    Kosanović Rade

    2004-01-01

    Full Text Available During the last several decades, cochlear implant has been fully recognized in treatment of severe hearing loss. Development of modern technology enabled inconceivable possibilities of technical qualities of the device as well as development of usable coding strategies, which led to extraordinary results in patient rehabilitation. Although cochlear implantation has become one of the routine operative procedures throughout the world nowadays, it gives rise to certain complications. These complications, though rare, can sometimes be very serious, even with fatal outcome. If cochlear implantation is performed by experienced and well-educated team of experts, the possibility of complications is minimal and is certainly not the argument against cochlear implantation as a method of treatment of severe hearing impairments.

  15. Complications in cochlear implant surgery.

    Science.gov (United States)

    Gheorghe, D C; Zamfir-Chiru-Anton, A

    2015-01-01

    For the last 6 years, cochlear implantation has become a standard practice in our department. The number of patients rose from 5 to 21/ year. Using multiple types of cochlear implants and indicating the surgery also to malformed inner ears led to the encounter of some complications. to present the surgical complications from our department. all the patients admitted and operated in our clinic have been reviewed. 9 complications (8,86%) have occurred: the impossibility of establishing a reliable cochleostomy (due to ossification), air in the cochlea through lack of sealing of the cochleostomy (exteriorization of the electrode array), cochlear implant postoperative migration from its bed, weak hearing discrimination due to "double electrodes" in the scala tympani, gusher. cochlear implanting needs to respect the technical steps of the surgery and the best technical/ tactical solution has to be found to whatever complications arise in complex or malformed cases!

  16. ADVANCED DENTAL IMPLANT PLACEMENT TECHNIQUES

    Directory of Open Access Journals (Sweden)

    Alex M. GREENBERG

    2017-12-01

    Full Text Available The availability of in office Cone Beam CT (CBCT scanners, dental implant planning software, CAD CAM milling, and rapid printing technologies allow for the precise placement of dental implants and immediate prosthetic temporization. These technologies allow for flapless implant placement, or open flap bone reduction for “All on 4” techniques with improved preoperative planning and intraoperative performance. CBCT permits practitioners in an office setting with powerful diagnostic capabilities for the evaluation of bone quality and quantity, as well as dental and osseous pathology essential for better informed dental implant treatment. CBCT provides the convenience of in office imaging and decreased radiation exposure. Rapid printing technologies provide decreased time and high accuracy for bone model and surgical guide fabrication.

  17. Occlusion management of implant-supported prostheses

    OpenAIRE

    Delmas, Marion

    2017-01-01

    The implant solution has become the treatment of choice to replace missing teeth and to help in the retention of complete denture. Dental implants have different biological and biomechanical characteristics than natural teeth. Occlusion of implant-supported prostheses is considered to be one of the most important factors contributing to implant success. This thesis aims to review current recommendations for occlusal management of implant-supported prosthesis. The known and applied occlusal co...

  18. Immediate implants for aesthetic success: New guidelines

    OpenAIRE

    Monish Bhola; Leyvee Cabanilla Jacobs; Shilpa Kolhatkar

    2015-01-01

    Immediate implant placement in extraction sockets is well-documented. There is adequate long-term evidence that immediate implants have survival rates similar to delayed placement. Additionally, immediate implants also help preserve the crestal bone and minimize soft tissue changes in the aesthetic zone. The decision to extract teeth and replace them with implants is determined by many factors. While implant insertion at the time of tooth extraction is desirable for a number of reasons, extra...

  19. Global CO{sub 2} emissions 2015. Trend reversion is still waiting, despite hopeful approaches; Weltweite CO{sub 2}-Emissionen 2015. Trendwende laesst trotz hoffnungsvoller Ansaetze nach wie vor auf sich warten

    Energy Technology Data Exchange (ETDEWEB)

    Ziesing, Hans-Joachim

    2016-10-15

    By 2015, global CO{sub 2} emissions were virtually unchanged from 2014 according to provisional calculations. On the whole, a slight increase may have resulted, which has slowed the growth of the past few years. In the previous year alone, the weakest growth since the beginning of the century had been recorded, with only 0.7% of the upturn (with the exception of the crises in 2008/2009). As a result, CO{sub 2} emissions in 2015 were only slightly higher than in the previous year, at 33.1 billion tonnes. A global trend reversal is still likely, but the CO{sub 2} emissions have declined in many countries, particularly in some industrialized countries. [German] Im Jahr 2015 haben sich die weltweiten CO{sub 2}-Emissionen nach vorlaeufigen Berechnungen gegenueber 2014 praktisch nicht veraendert. Insgesamt duerfte sich allenfalls ein leichtes Plus ergeben haben, womit der Zuwachs der vergangenen Jahre erneut gebremst wurde. Schon im Vorjahr war mit einem Plus von nur 0,7 % der bis dahin (mit Ausnahme der Krisenjahre 2008/2009) schwaechste Anstieg seit Beginn des Jahrhunderts zu verzeichnen gewesen. Im Ergebnis blieben die CO{sub 2}-Emissionen 2015 mit reichlich 33,1 Mrd. t nur geringfuegig ueber dem Niveau des Vorjahres. Eine weltweite Trendwende steht wohl noch nach wie vor aus, doch sind immerhin die CO{sub 2}-Emissionen in zahlreichen Laendern, insbesondere in etlichen Industrielaendern, gesunken.

  20. Implant rehabilitation in bruxism patient

    OpenAIRE

    Goiato, Marcelo Coelho [UNESP; Sonego, Mariana Vilela; dos Santos, Daniela Micheline [UNESP; da Silva, Emily Vivianne Freitas

    2014-01-01

    A white female patient presented to the university clinic to obtain implant retained prostheses. She had an edentulous maxillary jaw and presented three teeth with poor prognosis (33, 34 and 43). The alveolar bone and the surrounding tissues were healthy. The patient did not report any relevant medical history contraindicating routine dental treatment or implant surgery, but self-reported a dental history of asymptomatic nocturnal bruxism. The treatment plan was set and two Branemark protocol...

  1. Biomechanics of Corneal Ring Implants

    OpenAIRE

    Daxer, Albert

    2015-01-01

    Purpose: To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. Methods: The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant de...

  2. The Prevalence of Power-Sharing: Exploring the Patterns of Post-Election Peace Die Verbreitung von Power-Sharing: Bedingungen für eine friedliche Entwicklung nach Wahlen

    Directory of Open Access Journals (Sweden)

    Anna K. Jarstad

    2009-01-01

    Full Text Available Why are some elections followed by armed conflict, while others are not? This article begins to explore this question by mapping the prevalence of power-sharing agreements and patterns of post-election peace in states shattered by civil war. While democracy builds on the notion of free political competition and uncertain electoral outcomes, power-sharing reduces the uncertainty by ensuring political power for certain groups. Nevertheless, new data presented in this article – the Post-Accord Elections (PAE data collection – shows that the issues of peace, power-sharing and democracy have become intertwined as the vast majority of contemporary peace agreements provide for both power-sharing and elections. First, in contrast to previous research which has suggested that power-sharing is a tool for ending violence, this study shows that conflict often continues after an agreement has been signed, even if it includes provisions for power-sharing. Second, this investigation shows no evidence of power-sharing facilitating the holding of elections. On the contrary, it is more common that elections are held following a peace process without power-sharing. Third, a period of power-sharing ahead of the elections does not seem to provide for postelection peace. Rather, such elections are similarly dangerous as post-accord elections held without a period of power-sharing. The good news is that power-sharing does not seem to have a negative effect on post-election peace. Warum folgt auf Wahlen in manchen Fällen ein bewaffneter Konflikt, in anderen nicht? Die Autorin nähert sich der Antwort auf diese Frage, indem sie die Verteilung von Machtteilungsabkommen und Friedensbedingungen nach Wahlen in Bürgerkriegsstaaten untersucht. Während Demokratie auf der Vorstellung freien politischen Wettbewerbs und offener Wahlergebnisse basiert, reduziert Power-Sharing (Machtteilung diese Offenheit, indem bestimmten Gruppen politische Macht zugesichert wird. Aktuelle

  3. Biomechanics of Corneal Ring Implants

    Science.gov (United States)

    2015-01-01

    Purpose: To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. Methods: The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant designs. The strengthening factor is a measure of the amount of strengthening of the cornea induced by the implant. Results: For ring segments and incomplete rings, sf = 1.0, which indicates that these implants are not able to strengthen the cornea. The intracorneal continuous complete ring (MyoRing) has a strengthening factor of up to sf = 3.2. The MyoRing is, therefore, able to strengthen the cornea significantly. Conclusions: The result of the presented biomechanical analysis of different ring-shaped corneal implant designs can explain the different postoperative clinical results of different implant types in myopia and keratoconus. PMID:26312619

  4. Biomechanics of Corneal Ring Implants.

    Science.gov (United States)

    Daxer, Albert

    2015-11-01

    To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant designs. The strengthening factor is a measure of the amount of strengthening of the cornea induced by the implant. For ring segments and incomplete rings, sf = 1.0, which indicates that these implants are not able to strengthen the cornea. The intracorneal continuous complete ring (MyoRing) has a strengthening factor of up to sf = 3.2. The MyoRing is, therefore, able to strengthen the cornea significantly. The result of the presented biomechanical analysis of different ring-shaped corneal implant designs can explain the different postoperative clinical results of different implant types in myopia and keratoconus.

  5. The vestibular implant: Quo vadis?

    Directory of Open Access Journals (Sweden)

    Raymond eVan De Berg

    2011-08-01

    Full Text Available AbstractObjective: to assess the progress of the development of the vestibular implant and its feasibility short-term. Data sources: a search was performed in Pubmed, Medline and Embase. Key words used were vestibular prosth* and vestibular implant. The only search limit was language: English or Dutch. Additional sources were medical books, conference lectures and our personal experience with per-operative vestibular stimulation in patients selected for cochlear implantation.Study selection: all studies about the vestibular implant and related topics were included and evaluated by two reviewers. No study was excluded since every study investigated different aspects of the vestibular implant. Data extraction and synthesis: data was extracted by the first author from selected reports, supplemented by additional information, medical books conference lectures. Since each study had its own point of interest with its own outcomes, it was not possible to compare data of different studies. Conclusion: to use a basic vestibular implant in humans seems feasible in the very near future. Investigations show that electric stimulation of the canal nerves induces a nystagmus which corresponds to the plane of the canal which is innervated by the stimulated nerve branch. The brain is able to adapt to a higher baseline stimulation, while still reacting on a dynamic component. The best response will be achieved by a combination of the optimal stimulus (stimulus profile, stimulus location, precompensation, complemented by central vestibular adaptation. The degree of response will probably vary between individuals, depending on pathology and their ability to adapt.

  6. Auditory Midbrain Implant: A Review

    Science.gov (United States)

    Lim, Hubert H.; Lenarz, Minoo; Lenarz, Thomas

    2009-01-01

    The auditory midbrain implant (AMI) is a new hearing prosthesis designed for stimulation of the inferior colliculus in deaf patients who cannot sufficiently benefit from cochlear implants. The authors have begun clinical trials in which five patients have been implanted with a single shank AMI array (20 electrodes). The goal of this review is to summarize the development and research that has led to the translation of the AMI from a concept into the first patients. This study presents the rationale and design concept for the AMI as well a summary of the animal safety and feasibility studies that were required for clinical approval. The authors also present the initial surgical, psychophysical, and speech results from the first three implanted patients. Overall, the results have been encouraging in terms of the safety and functionality of the implant. All patients obtain improvements in hearing capabilities on a daily basis. However, performance varies dramatically across patients depending on the implant location within the midbrain with the best performer still not able to achieve open set speech perception without lip-reading cues. Stimulation of the auditory midbrain provides a wide range of level, spectral, and temporal cues, all of which are important for speech understanding, but they do not appear to sufficiently fuse together to enable open set speech perception with the currently used stimulation strategies. Finally, several issues and hypotheses for why current patients obtain limited speech perception along with several feasible solutions for improving AMI implementation are presented. PMID:19762428

  7. Cochlear implants and medical tourism.

    Science.gov (United States)

    McKinnon, Brian J; Bhatt, Nishant

    2010-09-01

    To compare the costs of medical tourism in cochlear implant surgery performed in India as compared to the United States. In addition, the cost savings of obtaining cochlear implant surgery in India were compare d to those of other surgical interventions obtained as a medical tourist. Searches were conducted on Medline and Google using the search terms: 'medical tourism', 'medical offshoring', 'medical outsourcing', 'cochlear implants' and 'cochlear implantation'. The information regarding cost of medical treatment was obtained from personal communication with individuals familiar with India's cochlear implantation medical tourism industry. The range of cost depended on length of stay as well as the device chosen. Generally the cost, inclusive of travel, surgery and device, was in the range of $21,000-30,000, as compared to a cost range of $40,000-$60,000 in the US. With the escalating cost of healthcare in the United States, it is not surprising that some patients would seek to obtain surgical care overseas at a fraction of the cost. Participants in medical tourism often have financial resources, but lack health insurance coverage. While cardiovascular and orthopedic surgery performed outside the United States in India at centers that cater to medical tourists are often performed at one-quarter to one-third of the cost that would have been paid in the United States, the cost differential for cochlear implants is not nearly as favorable.

  8. Imaging of common breast implants and implant-related complications: A pictorial essay

    Directory of Open Access Journals (Sweden)

    Amisha T Shah

    2016-01-01

    Full Text Available The number of women undergoing breast implant procedures is increasing exponentially. It is, therefore, imperative for a radiologist to be familiar with the normal and abnormal imaging appearances of common breast implants. Diagnostic imaging studies such as mammography, ultrasonography, and magnetic resonance imaging are used to evaluate implant integrity, detect abnormalities of the implant and its surrounding capsule, and detect breast conditions unrelated to implants. Magnetic resonance imaging of silicone breast implants, with its high sensitivity and specificity for detecting implant rupture, is the most reliable modality to asses implant integrity. Whichever imaging modality is used, the overall aim of imaging breast implants is to provide the pertinent information about implant integrity, detect implant failures, and to detect breast conditions unrelated to the implants, such as cancer.

  9. Topographic measurements of eyelids and orbit in enucleated eyes with hydroxyapatite integrated implant versus PMMA implant

    National Research Council Canada - National Science Library

    Gradinaru, S; Totir, M; Iancu, R; Leasu, C; Pricopie, S; Yasin, S; Ciuluvica, R; Ungureanu, E

    2014-01-01

    ... (Group A comprising of twenty patients had the coralline hydroxyapatite implant -Integrated Ocular Implants, USA and Group B comprising of twenty-three received non-integrated PMMA ocular implants...

  10. Imaging of common breast implants and implant-related complications: A pictorial essay

    Science.gov (United States)

    Shah, Amisha T; Jankharia, Bijal B

    2016-01-01

    The number of women undergoing breast implant procedures is increasing exponentially. It is, therefore, imperative for a radiologist to be familiar with the normal and abnormal imaging appearances of common breast implants. Diagnostic imaging studies such as mammography, ultrasonography, and magnetic resonance imaging are used to evaluate implant integrity, detect abnormalities of the implant and its surrounding capsule, and detect breast conditions unrelated to implants. Magnetic resonance imaging of silicone breast implants, with its high sensitivity and specificity for detecting implant rupture, is the most reliable modality to asses implant integrity. Whichever imaging modality is used, the overall aim of imaging breast implants is to provide the pertinent information about implant integrity, detect implant failures, and to detect breast conditions unrelated to the implants, such as cancer. PMID:27413269

  11. [Establishment of animal model with peri-implantitis after immediate implantation in rabbits].

    Science.gov (United States)

    Shen, Lan-Hua; Meng, Ling-Na; Wang, Xin; Jiang, Hui; Wang, Shan-Shan

    2015-02-01

    To establish animal model with peri-implantitis after immediate implantation and study bone defect characteristics by Micro-CT. Implants were immediately planted in the first mandibular anterior tooth of 12 rabbits. Silk ligatures were placed around one side of the implants to induce peri-implantitis. Micro-CT was used to evaluate bone defect at different periods after implantation. Silk ligatures around the implants were effective to induce peri-implantitis. With the development of peri-implantitis, implants can not be well integrated with bone. Bone defect was gradually produced and then aggravated, and finally formed typical "V-type" bone defect. The establishment of animal model with peri-implantitis is simple and effective, which provides important references for relative studies in the field of peri-implantitis.

  12. Why are mini-implants lost: The value of the implantation technique!

    Science.gov (United States)

    Romano, Fabio Lourenço; Consolaro, Alberto

    2015-01-01

    The use of mini-implants have made a major contribution to orthodontic treatment. Demand has aroused scientific curiosity about implant placement procedures and techniques. However, the reasons for instability have not yet been made totally clear. The aim of this article is to establish a relationship between implant placement technique and mini-implant success rates by means of examining the following hypotheses: 1) Sites of poor alveolar bone and little space between roots lead to inadequate implant placement; 2) Different sites require mini-implants of different sizes! Implant size should respect alveolar bone diameter; 3) Properly determining mini-implant placement site provides ease for implant placement and contributes to stability; 4) The more precise the lancing procedures, the better the implant placement technique; 5) Self-drilling does not mean higher pressures; 6) Knowing where implant placement should end decreases the risk of complications and mini-implant loss. PMID:25741821

  13. Why are mini-implants lost: The value of the implantation technique!

    Directory of Open Access Journals (Sweden)

    Fabio Lourenço Romano

    2015-02-01

    Full Text Available The use of mini-implants have made a major contribution to orthodontic treatment. Demand has aroused scientific curiosity about implant placement procedures and techniques. However, the reasons for instability have not yet been made totally clear. The aim of this article is to establish a relationship between implant placement technique and mini-implant success rates by means of examining the following hypotheses: 1 Sites of poor alveolar bone and little space between roots lead to inadequate implant placement; 2 Different sites require mini-implants of different sizes! Implant size should respect alveolar bone diameter; 3 Properly determining mini-implant placement site provides ease for implant placement and contributes to stability; 4 The more precise the lancing procedures, the better the implant placement technique; 5 Self-drilling does not mean higher pressures; 6 Knowing where implant placement should end decreases the risk of complications and mini-implant loss.

  14. Impedance changes in chronically implanted and stimulated cochlear implant electrodes.

    Science.gov (United States)

    Newbold, Carrie; Mergen, Silvana; Richardson, Rachael; Seligman, Peter; Millard, Rodney; Cowan, Robert; Shepherd, Robert

    2014-07-01

    Electrode impedance increases following implantation and undergoes transitory reduction with onset of electrical stimulation. The studies in this paper measured the changes in access resistance and polarization impedance in vivo before and following electrical stimulation, and recorded the time course of these changes. Impedance measures recorded in (a) four cats following 6 months of cochlear implant use, and (b) three cochlear implant recipients with 1.5-5 years cochlear implant experience. Both the experimental and clinical data exhibited a reduction in electrode impedance, 20 and 5% respectively, within 15-30 minutes of stimulation onset. The majority of these changes occurred through reduction in polarization impedance. Cessation of stimulation was followed by an equivalent rise in impedance measures within 6-12 hours. Stimulus-induced reductions in impedance exhibit a rapid onset and are evident in both chronic in vivo models tested, even several years after implantation. Given the impedance changes were dominated by the polarization component, these findings suggest that the electrical stimulation altered the electrode surface rather than the bulk tissue and fluid in the cochlea.

  15. Additional palatal implants for refractory snoring.

    Science.gov (United States)

    Catalano, Peter; Goh, Yao Hong; Romanow, John

    2007-07-01

    To evaluate safety and efficacy of additional palatal implants for snoring treatment. A prospective case series at two clinical sites in an office setting. Patients who did not have an acceptable reduction in snoring intensity after an initial 3 implant procedure received additional implants. Bed partners rated snoring intensity on a 10 cm visual analog scale (VAS) at baseline and 90 days postprocedure. Snoring intensity VAS decreased significantly from 6.4 +/- 2.3 to 4.6 +/- 2.9 (P < 0.01) for patients who received an additional fourth implant, and to 4.1 +/- 2.8 after the 5th implant (P<0.01). Epworth sleepiness scale scores also decreased significantly for patients who received additional fourth or fifth implants. There were no adverse events. Additional palatal implants for snoring treatment were safe and effective in this case series. Additional implants may offer relief for snorers not responding to the initial 3 implant procedure.

  16. Multicomponent Implant Releasing Dexamethasone

    Science.gov (United States)

    Nikkola, L.; Vapalahti, K.; Ashammakhi, N.

    2008-02-01

    Several inflammatory conditions are usually treated with corticosteroids. There are various problems like side effects with traditional applications of steroids, e.g. topical, or systemic routes. Local drug delivery systems have been studied and developed to gain more efficient administration with fewer side effects. Earlier, we reported on developing Dexamethasone (DX) releasing biodegradable fibers. However, their drug release properties were not satisfactory in terms of onset of drug release. Thus, we assessed the development of multicomponent (MC) implant to enhance earlier drug release from such biodegradable fibers. Poly (lactide-co-glycolide) (PLGA) and 2 wt-% and 8 wt-% DX were compounded and extruded with twin-screw extruder to form of fibers. Some of the fibers were sterilized to obtain a change in drug release properties. Four different fiber classes were studied: 2 wt-%, 8 wt-%, sterilized 2 wt-%, and sterilized 8 wt-%. 3×4 different DX-releasing fibers were then heat-pressed to form one multicomponent rod. Half of the rods where sterilized. Drug release was measured from initial fibers and multicomponent rods using a UV/VIS spectrometer. Shear strength and changes in viscosity were also measured. Drug release studies showed that drug release commenced earlier from multicomponent rods than from component fibers. Drug release from multicomponent rods lasted from day 30 to day 70. The release period of sterilized rods extended from day 23 to day 57. When compared to the original component fibers, the drug release from MC rods commenced earlier. The initial shear strength of MC rods was 135 MPa and decreased to 105 MPa during four weeks of immersion in phosphate buffer solution. Accordingly, heat pressing has a positive effect on drug release. After four weeks in hydrolysis, no disintegration was observed.

  17. Falha prematura em implantes orais = Early oral implant failures

    Directory of Open Access Journals (Sweden)

    Fadanelli, Alexandro Bianchi

    2005-01-01

    Full Text Available Atualmente, ainda há uma percentagem significativa de fracassos de implantes na prática clínica, causando transtorno para o profissional e para o paciente. O objetivo deste estudo foi avaliar a bibliografia disponível sobre o assunto, apresentar um caso clínico e discutir os aspectos relacionados aos insucessos na terapia com implantes ocorridos durante o período de osteointegração. A avaliação da literatura mostrou haverem múltiplos fatores possivelmente envolvidos nas falhas de implantes, sendo que através do estudo das falhas pode-se minimizar sua ocorrência

  18. Medical implants and methods of making medical implants

    Science.gov (United States)

    Shaw, Wendy J; Yonker, Clement R; Fulton, John L; Tarasevich, Barbara J; McClain, James B; Taylor, Doug

    2014-09-16

    A medical implant device having a substrate with an oxidized surface and a silane derivative coating covalently bonded to the oxidized surface. A bioactive agent is covalently bonded to the silane derivative coating. An implantable stent device including a stent core having an oxidized surface with a layer of silane derivative covalently bonded thereto. A spacer layer comprising polyethylene glycol (PEG) is covalently bonded to the layer of silane derivative and a protein is covalently bonded to the PEG. A method of making a medical implant device including providing a substrate having a surface, oxidizing the surface and reacting with derivitized silane to form a silane coating covalently bonded to the surface. A bioactive agent is then covalently bonded to the silane coating. In particular instances, an additional coating of bio-absorbable polymer and/or pharmaceutical agent is deposited over the bioactive agent.

  19. Cochlear Implantation Updates: The Dallas Cochlear Implant Program

    Science.gov (United States)

    Tobey, Emily A.; Britt, Lana; Geers, Ann; Loizou, Philip; Loy, Betty; Roland, Peter; Warner-Czyz, Andrea; Wright, Charles G.

    2013-01-01

    This report provides an overview of many research projects conducted by the Dallas Cochlear Implant Program, a joint enterprise between The University of Texas at Dallas, The University of Texas Southwestern Medical Center and Children’s Medical Center. The studies extend our knowledge of factors influencing communication outcomes in users of cochlear implants. Multiple designs and statistical techniques are used in the studies described including both cross sectional and longitudinal analyses. Sample sizes vary across the studies and many of the samples represent large populations of children from North America. Multiple statistical techniques are used by the team to analyze outcomes. The team has provided critical information regarding electrode placement, signal processing, and communication outcomes in users of cochlear implants. PMID:22668764

  20. Implantable biomedical devices on bioresorbable substrates

    Science.gov (United States)

    Rogers, John A; Kim, Dae-Hyeong; Omenetto, Fiorenzo; Kaplan, David L; Litt, Brian; Viventi, Jonathan; Huang, Yonggang; Amsden, Jason

    2014-03-04

    Provided herein are implantable biomedical devices, methods of administering implantable biomedical devices, methods of making implantable biomedical devices, and methods of using implantable biomedical devices to actuate a target tissue or sense a parameter associated with the target tissue in a biological environment. Each implantable biomedical device comprises a bioresorbable substrate, an electronic device having a plurality of inorganic semiconductor components supported by the bioresorbable substrate, and a barrier layer encapsulating at least a portion of the inorganic semiconductor components. Upon contact with a biological environment the bioresorbable substrate is at least partially resorbed, thereby establishing conformal contact between the implantable biomedical device and the target tissue in the biological environment.

  1. The mandibular two-implant overdenture

    Directory of Open Access Journals (Sweden)

    Abu-Hussein Muhammad

    2014-01-01

    Full Text Available Successful treatment with the two-implant overdenture has been documented with multiple implant designs (e.g., hexagonal, Morse taper, internal connection and many implant systems. Clinicians may select implants for retention of the two-implant overdenture according to personal experience and preference with confidence that treatment success will not be determined by the selection made. This is due primarily to the anatomy and density of the bone in the anterior mandible. The aim of this case report is to demonstrate the concept of immediate functional loading in the mandible using unsplinted implants to support a locator attachment supported overdenture.

  2. Multiple immediate implants placement with immediate loading

    Directory of Open Access Journals (Sweden)

    Sumit Narang

    2014-01-01

    Full Text Available The replacement of missing teeth with implant-borne restorations has become a treatment modality accepted by the scientific community for fully and partially edentulous patients. Recent reports have demonstrated the successful placement of dental implants into the fresh extraction socket in the anterior as well as in molar regions, which is made possible due to modification in implant surface. The present case report highlights the placement of three bicortical screw (BCS implants into the fresh extraction sockets and one  KOS implant in edentulous area with flapless technique. All the implants were immediately loaded and followed up for a period of 6 months.

  3. An Unusual Bone Loss Around Implants

    Directory of Open Access Journals (Sweden)

    Amirreza Rokn

    2013-01-01

    Full Text Available AbstractPre-implant disease is an inflammatory process, which can affect the surrounding tissues of a functional Osseointegrated implant that is usually as a result of a disequilibrium between the micro-flora and the body defense system.This case reports a 57 years old male with unusual bone loss around dental implants.This was an unusual case of peri-implantitis which occurred only in the implants on one side of the mouth although they all were unloaded implants.

  4. Sliding mechanics with microscrew implant anchorage.

    Science.gov (United States)

    Park, Hyo-Sang; Kwon, Tae-Geon

    2004-10-01

    Three cases are illustrated. One was treated with maxillary microscrew implants, another with mandibular microscrew implants, and the third with both maxillary and mandibular microscrew implants. With the maxillary microscrew implants, the maxillary anterior teeth were retracted bodily with a slight intrusion and all the premolar extraction space was closed without loss of anchorage. Furthermore, the maxillary posterior teeth showed distal movement. The mandibular microscrew implants controlled the vertical position of the mandibular posterior teeth and played an important role in improving the facial profile. The efficacy of sliding mechanics with microscrew implant anchorage on the treatment of skeletal Class II malocclusion is also discussed.

  5. Pterygoid implant for atrophic posterior maxilla

    Directory of Open Access Journals (Sweden)

    V R Balaji

    2017-01-01

    Full Text Available Replacement of missing teeth in the posterior maxilla is always a challenge for the treating implant surgeon as the posterior maxilla has several obstacles in the form of quality, quantity, the anatomy of the maxillary sinus, and inaccessibility. To overcome these deficiencies, several surgical procedures such as sinus lift, bone augmentation, tilted implants, short implants, and zygomatic implants were tried. Since these procedures have their own limitations, pterygomaxillary region provides us an excellent place for placement of implant and rehabilitation of posterior maxilla. This case report describes the usage of the pterygomaxillary region for placement of the implant to restore atrophic posterior maxilla, without any additional surgical procedures.

  6. Cranioplasty with individual titanium implants

    Science.gov (United States)

    Mishinov, S.; Stupak, V.; Sadovoy, M.; Mamonova, E.; Koporushko, N.; Larkin, V.; Novokshonov, A.; Dolzhenko, D.; Panchenko, A.; Desyatykh, I.; Krasovsky, I.

    2017-09-01

    Cranioplasty is the second procedure in the history of neurosurgery after trepanation, and it is still relevant despite the development of civilization and progress in medicine. Each cranioplasty operation is unique because there are no two patients with identical defects of the skull bones. The development of Direct Metal Laser Sintering (DMLS) technique opened up the possibility of direct implant printing of titanium, a biocompatible metal used in medicine. This eliminates the need for producing any intermediate products to create the desired implant. We have produced 8 patient-specific titanium implants using this technique for patients who underwent different decompressive cranioectomies associated with bone tumors. Follow-up duration ranged from 6 to 12 months. We observed no implant-related reactions or complications. In all cases of reconstructive neurosurgery we achieved good clinical and aesthetic results. The analysis of the literature and our own experience in three-dimensional modeling, prototyping, and printing suggests that direct laser sintering of titanium is the optimal method to produce biocompatible surgical implants.

  7. Keratoprosthesis. Implantation of artificial corneas.

    Science.gov (United States)

    Berta, A

    1997-01-01

    Keratoprosthesis (implantation of artificial, plastic cornea) is indicated in severe cases with corneal leucoma (non-transparent, cicatrized cornea) in which keratoplasty (corneal transplantation) is not possible or has repeatedly failed. In the past 40 years we implanted 37 artificial corneas (7 Cardona type, 29 Konstantinov type, 1 Fjodorov type). The visual acuity increase was temporary (lasting from a few weeks to a few months) in 25 patients. The visual acuity was at least 0.2 three years following the implantation of keratoprosthesis in 12 patients. One patient had 1.0 vision 10 years after surgery. Our results indicate that the implantation of artificial corneal is still an "ultimum refugium", an operation that can be justified only in monocular patients, in eyes that cannot be and/or had unsuccessfully been operated on with repeated keratoplasties. The visual improvement is temporary, but in some cases may last for several years. Still this is the only procedure by which useful vision can be provided, for shorter or longer time intervals, for patients suffering from corneal blindness (nontransparent cornea in otherwise functioning eye) whose only eye cannot be treated with corneal transplantation. Keratoprosthesis with better biocompatibility, better fixation techniques, and wider visual fields have to be developed before the implantation of artificial cornea can be looked upon as a surgical procedure with which full optical rehabilitation can be achieved.

  8. Capacitive Feedthroughs for Medical Implants.

    Science.gov (United States)

    Grob, Sven; Tass, Peter A; Hauptmann, Christian

    2016-01-01

    Important technological advances in the last decades paved the road to a great success story for electrically stimulating medical implants, including cochlear implants or implants for deep brain stimulation. However, there are still many challenges in reducing side effects and improving functionality and comfort for the patient. Two of the main challenges are the wish for smaller implants on one hand, and the demand for more stimulation channels on the other hand. But these two aims lead to a conflict of interests. This paper presents a novel design for an electrical feedthrough, the so called capacitive feedthrough, which allows both reducing the size, and increasing the number of included channels. Capacitive feedthroughs combine the functionality of a coupling capacitor and an electrical feedthrough within one and the same structure. The paper also discusses the progress and the challenges of the first produced demonstrators. The concept bears a high potential in improving current feedthrough technology, and could be applied on all kinds of electrical medical implants, even if its implementation might be challenging.

  9. Composite fibrous glaucoma drainage implant

    Science.gov (United States)

    Klapstova, A.; Horakova, J.; Shynkarenko, A.; Lukas, D.

    2017-10-01

    Glaucoma is a frequent reason of loss vision. It is usually caused by increased intraocular pressure leading to damage of optic nerve head. This work deals with the development of fibrous structure suitable for glaucoma drainage implants (GDI). Commercially produced metallic glaucoma implants are very effective in lowering intraocular pressure. However, these implants may cause adverse events such as damage to adjacent tissue, fibrosis, hypotony or many others [1]. The aim of this study is to reduce undesirable properties of currently produced drains and improve their properties by creating of the composite fibrous drain for achieve a normal intraocular pressure. Two types of electrospinning technologies were used for the production of very small tubular implants. First type was focused for production of outer part of tubular drain and the second type of electrospinning method made the inner part of shape follows the connections of both parts. Complete implant had a special properties suitable for drainage of fluid. Morphological parameters, liquid transport tests and in-vitro cell adhesion tests were detected.

  10. Alternative Techniques in Cochlear Implantation.

    Science.gov (United States)

    Sürmelioğlu, Özgür; Özdemir, Süleyman; Tarkan, Özgür; Tuncer, Ülkü; Çetik, Fikret; Kara, Karahan; Kıroğlu, Mete

    2016-04-01

    To review the alternative techniques in cochlear implantation and to compare the complications with different techniques. Patients who had undergone cochlear implantation were reviewed. Those patients who were operated using alternative techniques were selected and evaluated for the cause of their hearing loss and for the type of alternative technique that was utilized. Complication types and rates in these patients were evaluated. In total, 38 patients were operated using alternative techniques following preoperative or intraoperative findings. The mean age of the patients was 8.3 (1-51) years. There were 20 male and 18 female patients. Thirteen patients were operated with a suprameatal approach and 18 with a transcanal approach. Resection of the bony part of the external ear canal and reconstruction (canal wall down technique) was performed in seven patients. Postoperative complications included wound infection, hematoma, chorda tympani injury, and tympanic membrane perforation. Cochlear implantation is an effective method in the rehabilitation of sensorineural hearing loss. Complications are rare but can sometimes cause hematoma, taste impairment, tympanic membrane perforation, or wound infections. The standard procedure is not always suitable for patients with temporal bone abnormalities. Surgeons performing cochlear implantation should be aware of these variations and should be able to perform alternative implant techniques in these cases.

  11. Biomechanical effects of implant number and diameter on stress distributions in maxillary implant-supported overdentures.

    Science.gov (United States)

    Dimililer, Gizem; Kücükkurt, Sercan; Cetiner, Sedat

    2017-05-26

    Implant-supported overdentures (ISOs) are considered a good alternative to conventional removable dentures. However, varying rates of failure have been reported in some clinical studies. Excessive stress on surrounding tissues is one of the possible causes of implant failure. As stress is transmitted to the bone through the implant, careful planning, correct number of implants, and implant positioning are keys to ensuring appropriate stress distribution. However, research of the optimal number of implants necessary to support a maxillary ISO is insufficient. The purpose of this in vitro finite element study was to determine the optimal implant location, number, and diameter to support a maxillary ISO. Three-dimensional models of an atrophic maxilla, dental implants, and ball attachments were modeled, and different loading conditions were applied to simulate realistic conditions. Six models with different numbers and diameters of implants, including mini-dental implants and differently located implants, were formed, and stress values were compared by implementing a finite element analysis. The study showed that, as the implant number increased, decreased stress values were observed in periimplant bone and implants in the maxillary ISO prosthesis. However, changes in implant diameter had no significant effect on stresses. Increasing the implant diameter was not advantageous; the use of mini-dental implants may be a viable alternative method. However, using 4 implants for maxillary ISOs is indicated. Copyright © 2017 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

  12. Factors influencing the fracture of dental implants.

    Science.gov (United States)

    Chrcanovic, Bruno Ramos; Kisch, Jenö; Albrektsson, Tomas; Wennerberg, Ann

    2018-02-01

    Implant fractures are rare but offer a challenging clinical situation. To determine the prevalence of implant fracture and the possible risk factors predisposing an implant to a higher fracture risk. This retrospective study is based on 2670 patients consecutively treated with implant-supported prostheses. Anatomical-, patient-, and implant-related factors were collected. Descriptive statistics and survival analyses were performed. Generalized estimating equations (GEE) evaluated the effect of explanatory variables on implant fracture. Forty-four implants (out of 10 099; 0.44%) fractured. The mean ± standard deviation time for fracture to occur was 95.1 ± 58.5 months (min-max, 3.8-294.7). Half of the occurrences of fracture happened between 2 and 8 years after implantation. Five factors had a statistically significant influence on the fracture of implants (increase/decrease in fracture probability): use of higher grades of titanium (decrease 72.9%), bruxism (increase 1819.5%), direct adjacency to cantilever (increase 247.6%), every 1 mm increase in implant length (increase 22.3%), every 1 mm increase in implant diameter (decrease 96.9%). It is suggested that 5 factors could influence the incidence of implant fractures: grade of titanium, implant diameter and length, cantilever, bruxism. © 2017 Wiley Periodicals, Inc.

  13. Micromotion of Dental Implants: Basic Mechanical Considerations

    Directory of Open Access Journals (Sweden)

    Werner Winter

    2013-01-01

    Full Text Available Micromotion of dental implants may interfere with the process of osseointegration. Using three different types of virtual biomechanical models, varying contact types between implant and bone were simulated, and implant deformation, bone deformation, and stress at the implant-bone interface were recorded under an axial load of 200 N, which reflects a common biting force. Without friction between implant and bone, a symmetric loading situation of the bone with maximum loading and displacement at the apex of the implant was recorded. The addition of threads led to a decrease in loading and displacement at the apical part, but loading and displacement were also observed at the vertical walls of the implants. Introducing friction between implant and bone decreased global displacement. In a force fit situation, load transfer predominantly occurred in the cervical area of the implant. For freshly inserted implants, micromotion was constant along the vertical walls of the implant, whereas, for osseointegrated implants, the distribution of micromotion depended on the location. In the cervical aspect some minor micromotion in the range of 0.75 μm could be found, while at the most apical part almost no relative displacement between implant and bone occurred.

  14. Long-Acting Reversible Contraception (LARC): IUD and Implant

    Science.gov (United States)

    ... of use of the IUD? • What is the birth control implant? • How does the birth control implant work? • What are the benefits of the birth control implant? • How is the birth control implant inserted? • ...

  15. A Radiographic Classification for Retrograde Peri-implantitis

    National Research Council Canada - National Science Library

    Shah, Rucha; Thomas, Raison; Kumar, A B Tarun; Mehta, Dhoom Singh

    2016-01-01

    Retrograde peri-implantitis (RPI) is an inflammatory disease that affects the apical part of an osseointegrated implant, while the coronal portion of the implant sustains a normal bone-to-implant interface...

  16. Sound localization ability of young children with bilateral cochlear implants.

    NARCIS (Netherlands)

    Beijen, J.W.; Snik, A.F.M.; Mylanus, E.A.M.

    2007-01-01

    OBJECTIVE: To evaluate the benefit of bilateral cochlear implantation in young children. STUDY DESIGN: Clinical trial comparing a group of bilaterally implanted children with a group of unilaterally implanted children. SETTING: Tertiary referral center. PATIENTS: Five bilaterally implanted children

  17. Ridge augmentation in implant dentistry

    Directory of Open Access Journals (Sweden)

    Manoj Goyal

    2015-01-01

    Full Text Available Dimensional changes in the alveolar ridge after extraction often compromises on achieving optimal implant stability and placement of implants in the right prosthodontic positions. These situations demand augmentation of the residual ridge to achieve successful implant placement and long-term survival. Although the available literature speaks of an overabundance of techniques and agents for ridge augmentation, there is a relative paucity of quality evidence to guide the selection of suitable techniques and material. Henceforth, this paper is an endeavor to develop and describe an evidence-based decision pathway for the selection of suitable techniques for various clinical situations. Additionally, a descriptive overview of various techniques and materials is presented.

  18. Scleral buckling with hydrogel implant

    Directory of Open Access Journals (Sweden)

    Das Taraprasad

    1991-01-01

    Full Text Available The hydrogel implant for scleral buckling, first developed in 1980, is said to combine the advantages of both solid silicone rubber and silicone sponges. But it is still not widely used. Our clinical experience with the hydrogel implant used in 23 cases of rhegmatogenous retinal detachment is described. It was used both as exoplant and implant. Anatomical success was achieved in 91% of the cases. There was no infection, erosion, migration of extrusion of the buckle. The advantages are that it is soft, elastic, nontoxic, and nonpyogenic; it is devoid of infection and postoperatively it swells up, for additional heightening of the buckle. This new material appears to combine the advantages of both silicone sponge and solid silicon rubber thereby providing an ideal buckling material.

  19. Implant rehabilitation in bruxism patient.

    Science.gov (United States)

    Goiato, Marcelo Coelho; Sonego, Mariana Vilela; dos Santos, Daniela Micheline; da Silva, Emily Vivianne Freitas

    2014-06-06

    A white female patient presented to the university clinic to obtain implant retained prostheses. She had an edentulous maxillary jaw and presented three teeth with poor prognosis (33, 34 and 43). The alveolar bone and the surrounding tissues were healthy. The patient did not report any relevant medical history contraindicating routine dental treatment or implant surgery, but self-reported a dental history of asymptomatic nocturnal bruxism. The treatment plan was set and two Branemark protocols supported by six implants in each arch were installed after a 6-month healing period. A soft occlusal splint was made due to the patient's history of bruxism, and the lack of its use by the patient resulted in an acrylic fracture. The prosthesis was repaired and the importance of using the occlusal splint was restated. In the 4-year follow-up no fractures were reported. 2014 BMJ Publishing Group Ltd.

  20. Morphofunctional aspects of dental implants.

    Science.gov (United States)

    Meyer, Georg; Fanghänel, Jochen; Proff, Peter

    2012-03-20

    Although oral implantology is among the most beneficial developments of modern dentistry, the widely spread opinion that the long-term outcome of implants is superior to that of natural teeth has been refuted. To evade uncritical extractions, the morphofunctional properties of natural teeth and implant-supported restorations are compared from a proprioceptive and occlusal trauma perspective. The periodontal ligament of natural teeth provides the central nerve system with feedback for sensory perception and motor control. Conversely, the lack of such proprioception causes lower tactile sensitivity and less coordinated masticatory muscle activity in implant-borne restorations and makes them more prone to occlusal overload and possible subsequent failure. Moreover, occlusal anomalies may be conducive to parafunctional activity, craniomandibular disorder, tinnitus, and headache. Oral implantology, therefore, has to take appropriate account of occlusal conditions and the biomechanical and neuromuscular aspects of masticatory function. Copyright © 2011. Published by Elsevier GmbH.

  1. Radioactive implants for medical applications; Radioaktive Implantate fuer medizinische Anwendungen

    Energy Technology Data Exchange (ETDEWEB)

    Schubert, M.

    2008-07-01

    The long-term success of surgery is often diminished by excessive wound healing, which makes another intervention necessary. Locally applied radionuclides with short range radiation can prevent such benign hyperproliferation. As pure electron emitter with a half-life of 14.3 days and a mean energy of 694.9 keV (E{sub max}=1710.48 keV) {sup 32}P is a suitable radionuclide which can be produced from the stable {sup 31}P by the capture of thermal neutrons (1 x 10{sup 14} /s/cm{sup 2}) in a nuclear reactor. After a typical irradiation time (14 days) the ratio of {sup 32}P to {sup 31}P is 1.4 x 10{sup -5} to 1. Implants made of polymer and/or bioabsorbable material functioning as a carrier of the radioactive emitter allow - as opposed to metallic implants - for new applications for this type of radiotherapy. In this thesis a manufacturing method for previously not available organic, radioactive implants has been developed and a corresponding dosimetry system has been established. By means of ion implantation, {sup 32}P ions with up to 180 keV can be shot some 100 nm deep into organic implant materials. For a typical dose (15 Gy over 7 days, 1 mm distance from the implant) an activity of 75 kBq is needed corresponding to 1.3 x 10{sup 11} {sup 32}P ions. The sputter ion gun, which has been optimized for this application, creates an ion beam with high beam current (> 14 {mu}A P{sup -}) and low emittance (< 4 {pi} mm mrad {radical}(MeV)). Because of the good beam quality also small implants (<1 mm{sup 2}) can be manufactured with high efficiency. The unintentionally co-implanted portion of molecules and nuclides of the same mass (e.g. {sup 31}PH, {sup 16}O{sub 2} and {sup 32}S) could be reduced from approximately 500 to 50 by an improvement of the isotope selection at {sup 32}P beam creation. Hence, in comparison with the best hitherto existing implantation methods, the radiation dose of the implant could be reduced by an order of magnitude. With regard to the beta

  2. Carbon Fiber Biocompatibility for Implants.

    Science.gov (United States)

    Petersen, Richard

    Carbon fibers have multiple potential advantages in developing high-strength biomaterials with a density close to bone for better stress transfer and electrical properties that enhance tissue formation. As a breakthrough example in biomaterials, a 1.5 mm diameter bisphenol-epoxy/carbon-fiber-reinforced composite rod was compared for two weeks in a rat tibia model with a similar 1.5 mm diameter titanium-6-4 alloy screw manufactured to retain bone implants. Results showed that carbon-fiber-reinforced composite stimulated osseointegration inside the tibia bone marrow measured as percent bone area (PBA) to a great extent when compared to the titanium-6-4 alloy at statistically significant levels. PBA increased significantly with the carbon-fiber composite over the titanium-6-4 alloy for distances from the implant surfaces of 0.1 mm at 77.7% vs. 19.3% (p carbon fiber properties that increased PBA for enhanced implant osseointegration. Carbon fibers acting as polymer coated electrically conducting micro-biocircuits appear to provide a biocompatible semi-antioxidant property to remove damaging electron free radicals from the surrounding implant surface. Further, carbon fibers by removing excess electrons produced from the cellular mitochondrial electron transport chain during periods of hypoxia perhaps stimulate bone cell recruitment by free-radical chemotactic influences. In addition, well-studied bioorganic cell actin carbon fiber growth would appear to interface in close contact with the carbon-fiber-reinforced composite implant. Resulting subsequent actin carbon fiber/implant carbon fiber contacts then could help in discharging the electron biological overloads through electrochemical gradients to lower negative charges and lower concentration.

  3. The cochlear implant; basic principles.

    Science.gov (United States)

    Brackmann, D E

    1976-03-01

    In recent years the cochlear implant has been a subject of much discussion and controversy. The clinician has often been confused by the conflicting reports of success and failure. In this paper the development of the cochlear implant is reviewed and its present status summarized. It is hoped that the clinician may thereby gain an understanding of this device so that he can better evaluate its present and future status. Selection of Patients for Cochlear Implantation. The cochlear implant will benefit only those patients with hair cell loss who have remaining viable auditory neurons. In order to determine whether viable neurons remain, an electric current is passed through a small needle which is place into the promontory through the tympanic membrane. If patients experience an auditory sensation as a result of this electrical stimulation, it is felt that they are suitable candidates for a cochlear implant. Feasibility of Long-Term VIIIth Nerve Stimulation. Many questions have been raised regarding the feasibility of long-term stimulation of the auditory nerve. The first question raised was whether the auditory nerve would survive severe hair cell degeneration. Studies have shown that in most cases at least a few auditory neurons remain. The next question was whether the cochlear implant itself would destroy the remaining auditory neurons. Preliminary studies have shown that the nerve will survive the placement of electrodes both into the modiolus and the scala tympani. Several electrode materials and insulation have been found to be well tolerated, and there has been minimal damage from thermal or electrolytic processes; therefore, it appears feasible to stimulate the auditory nerve over a long period. Information Transfer by Electrical Stimulation. Single-channel stimulation produces only periodicity pitch, and information transfer is insufficient for speech discrimination. Experience to date indicates that it will be possible to produce both place and volley

  4. Fractographic analysis of fractured dental implant components

    Directory of Open Access Journals (Sweden)

    Chih-Ling Chang

    2013-03-01

    Conclusion: To avoid implant fracture, certain underlying mechanical risk factors should be noted such as patients with a habit of bruxism, bridgework with a cantilever design, or two implants installed in a line in the posterior mandible.

  5. Neutrophil Responses to Sterile Implant Materials.

    Directory of Open Access Journals (Sweden)

    Siddharth Jhunjhunwala

    Full Text Available In vivo implantation of sterile materials and devices results in a foreign body immune response leading to fibrosis of implanted material. Neutrophils, one of the first immune cells to be recruited to implantation sites, have been suggested to contribute to the establishment of the inflammatory microenvironment that initiates the fibrotic response. However, the precise numbers and roles of neutrophils in response to implanted devices remains unclear. Using a mouse model of peritoneal microcapsule implantation, we show 30-500 fold increased neutrophil presence in the peritoneal exudates in response to implants. We demonstrate that these neutrophils secrete increased amounts of a variety of inflammatory cytokines and chemokines. Further, we observe that they participate in the foreign body response through the formation of neutrophil extracellular traps (NETs on implant surfaces. Our results provide new insight into neutrophil function during a foreign body response to peritoneal implants which has implications for the development of biologically compatible medical devices.

  6. Clinical Management of Implant Prostheses in Patients with Bruxism

    OpenAIRE

    Osamu Komiyama; Frank Lobbezoo; Antoon De Laat; Takashi Iida; Tsuyoshi Kitagawa; Hiroshi Murakami; Takao Kato; Misao Kawara

    2012-01-01

    There is general agreement that excessive stress to the bone-implant interface may result in implant overload and failure. Early failure of the implant due to excessive loading occurs shortly after uncovering the implant. Excess load on a final restoration after successful implant integration can result in physical failure of the implant structure. Many clinicians believe that overload of dental implants is a risk factor for vertical peri-implant bone loss and/or may be detrimental for the su...

  7. Implants in free fibula flap supporting dental rehabilitation - Implant and peri-implant related outcomes of a randomized clinical trial.

    Science.gov (United States)

    Kumar, Vinay V; Ebenezer, Supriya; Kämmerer, Peer W; Jacob, P C; Kuriakose, Moni A; Hedne, Naveen; Wagner, Wilfried; Al-Nawas, Bilal

    2016-11-01

    The objective of this study was to assess the difference in success rates of implants when using two or four implant-supported-overdentures following segmental mandibular reconstruction with fibula free flap. This prospective, parallel designed, randomized clinical study was conducted with 1:1 ratio. At baseline, all participants already had segmental reconstruction of mandible with free fibula flap. The participants were randomized into two groups: Group-I received implant-supported-overdentures on two tissue-level implants and Group-II received implant-supported-overdentures on four tissue-level implants. Success rates of the implants were evaluated at 3 months, 6 months and 12 months following implant loading using marginal bone level changes as well as peri-implant indices (Buser et al., 1990). 52 patients were randomized into two treatment groups (26 each), out of which 18 patients (36 implants) of Group-I and 17 patients (68 implants) of Group-II were evaluated. One implant in Group-I was lost due to infective complications and one patient in the same group had superior barrel necrosis. There was a statistically significant increase at both time points (p = 0.03, p = 0.04 at 6 months, 12 months) in the amount of marginal bone loss in Group-I (0.4 mm, 0.5 mm at 6 months, 12 months) as compared to Group-II (0.1 mm, 0.2 mm at 6 months, 12 months). There were no clinically significant changes peri-implant parameters between both groups. Peri-implant soft tissue hyperplasia was seen in both groups, 32% of implants at 3-months, 26% at 6-months and 3% at 12-months follow-up. The results of this study show that patients with 2-implant-supported-overdentures had higher marginal bone loss as compared to patients with 4-implant-supported-overdentures. There were no clinically significant differences in peri-implant soft tissue factors in patients with 2- or 4-implant-supported-overdentures. Hyperplastic peri-implant tissues are common in the early implant

  8. Implants and Ethnocide: Learning from the Cochlear Implant Controversy

    Science.gov (United States)

    Sparrow, Robert

    2010-01-01

    This paper uses the fictional case of the "Babel fish" to explore and illustrate the issues involved in the controversy about the use of cochlear implants in prelinguistically deaf children. Analysis of this controversy suggests that the development of genetic tests for deafness poses a serious threat to the continued flourishing of Deaf…

  9. Hydroxyapatite-coated uncemented implants and peri-implant infection

    NARCIS (Netherlands)

    Oosterbos, Cornelis Johannes Maria

    2004-01-01

    One of the major complications of joint replacement surgery is a peri-implant infection. A hip prosthesis coated with hydroxyapatite, a calcium phosphate (found in human bone), may offer protection in this respect. In a series of patients who were treated with a hydroxyapatite-coated hip prosthesis

  10. Implantable Cardiac Pacemakers – 50 Years from the First Implantation

    Directory of Open Access Journals (Sweden)

    Ratko Magjarević

    2010-01-01

    Overview: Development of implantable cardiac pacemaker was enabled by another important invention, the silicon transistor. h ough the invention of suitable lithium cells as appropriate power supply was essential for prolongation of battery life cycle and for increased reliability of pacemakers, main milestones in the development were associated with technological breakthroughs in electronics: from transistors, which introduced such features as small size and low power consumption, to hybrid and integrated circuits, which enabled programmability, microprocessors, which added more options in programming (multiprogrammability, diagnostics and telemetry, and the ICT (information communication technology that enabled physicians remote access to patients and interrogation of their implantable devices. Conclusions: Implantable pacemakers are reliable devices indicated for a wide range of dif erent therapies of cardiac rhythm disorders and heart failure. h ere is still a lot to learn about the physiology of a normal heart and even more about the failing heart. Modern pacemakers provide physicians valuable information from pacemakers’ memory via the built-in telemetry system. h ese information help physicians to better understand pathologic processes within the heart, thus contributing to the development of new ideas for treatment of diseases and for precise tailoring of the therapy to the patient’s needs. Although implantable pacemakers have reached the level of mature technology, they will continue to develop with therapies and diagnostics to facilitate a higher quality of life.

  11. CO2 laser surface treatment of failed dental implants for re-implantation: an animal study.

    Science.gov (United States)

    Kasraei, Shahin; Torkzaban, Parviz; Shams, Bahar; Hosseinipanah, Seyed Mohammad; Farhadian, Maryam

    2016-07-01

    The aim of the present study was to evaluate the success rate of failed implants re-implanted after surface treatment with CO2 laser. Despite the widespread use of dental implants, there are many incidents of failures. It is believed that lasers can be applied to decontaminate the implant surface without damaging the implant. Ten dental implants that had failed for various reasons other than fracture or surface abrasion were subjected to CO2 laser surface treatment and randomly placed in the maxillae of dogs. Three failed implants were also placed as the negative controls after irrigation with saline solution without laser surface treatment. The stability of the implants was evaluated by the use of the Periotest values (PTVs) on the first day after surgery and at 1, 3, and 6 months post-operatively. The mean PTVs of treated implants increased at the first month interval, indicating a decrease in implant stability due to inflammation followed by healing of the tissue. At 3 and 6 months, the mean PTVs decreased compared to the 1-month interval (P implant stability. The mean PTVs increased in the negative control group compared to baseline (P implants were significantly lower than control group at 3 and 6 months after implant placement (P implantation of failed implants in Jack Russell Terrier dogs after CO2 laser surface debridement is associated with a high success rate in terms of implant stability.

  12. Impact of cone-beam computed tomography on implant planning and on prediction of implant size

    Energy Technology Data Exchange (ETDEWEB)

    Pedroso, Ludmila Assuncao de Mello; Silva, Maria Alves Garcia Santos, E-mail: ludmilapedroso@hotmail.com [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Fac. de Odontologia; Garcia, Robson Rodrigues [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Fac. de Odontologia. Dept. de Medicina Oral; Leles, Jose Luiz Rodrigues [Universidade Paulista (UNIP), Goiania, GO (Brazil). Fac. de Odontologia. Dept. de Cirurgia; Leles, Claudio Rodrigues [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Fac. de Odontologia. Dept. de Prevencao e Reabilitacao Oral

    2013-11-15

    The aim was to investigate the impact of cone-beam computed tomography (CBCT) on implant planning and on prediction of final implant size. Consecutive patients referred for implant treatment were submitted to clinical examination, panoramic (PAN) radiography and a CBCT exam. Initial planning of implant length and width was assessed based on clinical and PAN exams, and final planning, on CBCT exam to complement diagnosis. The actual dimensions of the implants placed during surgery were compared with those obtained during initial and final planning, using the McNemmar test (p < 0.05). The final sample comprised 95 implants in 27 patients, distributed over the maxilla and mandible. Agreement in implant length was 50.5% between initial and final planning, and correct prediction of the actual implant length was 40.0% and 69.5%, using PAN and CBCT exams, respectively. Agreement in implant width assessment ranged from 69.5% to 73.7%. A paired comparison of the frequency of changes between initial or final planning and implant placement (McNemmar test) showed greater frequency of changes in initial planning for implant length (p < 0.001), but not for implant width (p = 0.850). The frequency of changes was not influenced by implant location at any stage of implant planning (chi-square test, p > 0.05). It was concluded that CBCT improves the ability of predicting the actual implant length and reduces inaccuracy in surgical dental implant planning. (author)

  13. Comparison of the measured specific activities of cesium in mushrooms, pine tree twigs, blueberries, honey and game in Aachen after 1986; Vergleich der gemessenen spezifischen Cs-Aktivitaeten in Mykorrhizapilzen, Fichtenzweigen, Heidelbeeren, Waldhonig sowie Wildfleisch in Aachen nach 1986

    Energy Technology Data Exchange (ETDEWEB)

    Bonka, H.; Schmelz, G. [Technische Hochschule Aachen (Germany). Lehrgebiet Strahlenschutz in der Kerntechnik

    1998-07-01

    After the nuclear reactor accident at Chernobyl the specific activity in mushrooms originating from the region of Aachen was continuously measured until today. At the same time the specific activity was determined in pine tree twigs, blueberries, honey and game. There is a strong connection of the living organisms and the inanimate environment within the forest ecosystem. The decrease of the specific caesium activity in living organisms is slower than in the other environment. (orig.) [German] Nach dem Kernreaktorunfall in Tschernobyl wurde bis heute die spezifische Aktivitaet in Pilzen aus der Umgebung von Aachen gemessen. Parallel hierzu wurde sie in Fichtenzweigen, Heidelbeeren, Waldhonig und Wildfleisch ermittelt. Es zeigt sich eine starke Kopplung der lebenden Organismen und der unbelebten Umwelt im Waldoekosystem. In lebenden Organismen ist der Abfall der spezifischen Cs-Aktivitaet langsamer als in der uebrigen Umwelt. (orig.)

  14. Recall dermatitis caused by reexposition of decotaxel following irradiation of the brain. Case report and review of literature; Recall-Dermatitis durch Docetaxel-Reexposition nach Gehirnbestrahlung. Fallbeobachtung und Literaturuebersicht

    Energy Technology Data Exchange (ETDEWEB)

    Giesel, B.U.; Kutz, G.G.; Thiel, H.J. [Klinikum Bamberg (Germany). Klinik fuer Strahlentherapie und Radioonkologie

    2001-09-01

    -Hals-Region integriert. Hierbei muss gerade in der palliativen Situation einer Verstaerkung der Nebenwirkungen durch Interaktion der einzelnen Therapiekomponenten besondere Aufmerksamkeit geschenkt werden. Wir berichten deshalb ueber eine schwere Recall-Dermatitis, die wir bei zwei Patientinnen mit einem Mammakarzinom nach Gehirnbestrahlung und anschliessender Reexposition mit Docetaxel beobachtet haben. Patienten und Methode: Von Januar bis Maerz 1999 wurden an unserer Klinik zwei Patientinnen mit bereits fortgeschritten metastasiertem Mammakarzinom wegen neu aufgetretener Gehirnmetastasierung bzw. Meningeosis carcinomatosa einer Ganzhirnbestrahlung unterzogen (2 Gy fuenfmal woechentlich bis zu einer Referenzdosis von 50 Gy). Beide Patientinnen wurden seit Oktober bzw. November 1998 mehrfach mit Docetaxel (Taxotere {sup cirledR}) 30 mg/m{sup 2} Koerperoberflaeche (KOF) woechentlich bzw. 100 mg/m{sup 2} KOF monatlich behandelt. Nach Abschluss der Bestrahlung wurde die Docetaxel-Behandlung fortgesetzt. Ergebnisse: Von beiden Patientinnen wurde Docetaxel vor und waehrend der Bestrahlung gut vertragen. Erst nach Abschluss der Bestrahlung und Docetaxel-Reexposition kam es reproduzierbar zu einem massiven Erythem im Bereich der gesamten bestrahlten Kopfhaut mit Ausbildung feuchter Epitheliolysen und Krustenbildung (CTC-Grad IV). Schlussfolgerung: Die in unseren beiden Faellen beobachtete Dermatitis nach Bestrahlung und Docetaxel-Reexposition ist Ausdruck eines Recall-Phaenomens. Der zugrunde liegende Pathomechanismus ist derzeit noch nicht vollstaendig geklaert. Es bleibt zu untersuchen, inwieweit die Taxane mit der Strahlentherapie - auch im Hinblick auf zukuenftige primaere Radiochemotherapiekonzepte - kombiniert werden koennen, ohne schwerwiegende Toxizitaeten im Bereich der strahlenexponierten Haut oder Schleimhaut auszuloesen. (orig.)

  15. Male gonadal dose an adjuvant 3-D-pelvic irradiation after anterior resection of rectal cancer. Influence to fertility; Radiogene Hodenbelastung durch Streustrahlung bei adjuvanter 3-D-Beckenbestrahlung nach anteriorer Resektion beim Rektumkarzinom. Einfluss auf die Fertilitaet

    Energy Technology Data Exchange (ETDEWEB)

    Piroth, M.D.; Hensley, F.; Wannenmacher, M.; Zierhut, D. [Radiologische Klinik der Univ. Heidelberg (Germany). Abt. fuer Klinische Radiologie

    2003-11-01

    Maenner erkranken. Wir untersuchten die radiogene Hodenbelastung durch Streustrahlung bei adjuvanter Beckenbestrahlung nach Operation eines Rektumkarzinoms. Die gemessenen Strahlendosen am Hoden wurden zu den Daten der Literatur in Beziehung gesetzt. Patienten und Methode: Wir fuehrten bei 18 Patienten mit thermolumineszenzdetektoren (TLD) In-vivo-Messungen zur Bestimmung der streustrahlenbedingten Gonadendosis durch. Die TLDs wurden an vier definierten Punkten des Skrotums fixiert. Die Bestrahlung erfolgte 3-D-geplant in Drei-Felder-Technik in Bauchlage im Lochbrett. Die Gesamtdosis betrug 50,4 Gy, die Einzeldosis 1,8 Gy taeglich. Nach 45 Gy erfolgte eine Modifikation der Bestrahlungstechnik auf opponierende und kranial verkuerzte Gegenfelder zur kompletten Duenndarmschonung. Ergebnisse: Die mittlere Gonadendosis aller 18 Patienten pro Bestrahlungsfraktion betrug 0,057 Gy (median 0,05 Gy), wobei die Mittelwerte der einzelnen Patienten zwischen 0,035 und 0,114 Gy lagen. Die Standardabweichung betrug 0,02 Gy. Nach 28 Fraktionen, 50,4 Gy entsprechend, errechnete sich kumulativ eine Gesamtdosis am Hoden von 1,60 Gy (0,98-3,19 Gy). Schlussfolgerungen: Das maennliche Keimepithel reagiert auf Bestrahlung ausserordentlich sensibel im Sinne eines negativen Fraktionierungseffektes. Bei Gesamtdosen > 1,5 Gy, fraktioniert appliziert, gilt die Azoospermie als meist irreversibel. Die von uns ermittelte Gonadendosis fuehrt nach den Daten der Literatur sehr wahrscheinlich zu einer dauerhaften Sterilitaet. Wegen der geringen Patientenanzahl sind die Daten vorsichtig zu interpretieren, dennoch muss der Patient ueber die hohe Wahrscheinlichkeit einer bleibenden Infertilitaet aufgeklaert werden. Eine moegliche praetherapeutische Spermakryokonservierung sollte mit dem Patienten besprochen werden. (orig.)

  16. Augmentation Mammaplasty Using Implants: A Review

    Directory of Open Access Journals (Sweden)

    Susumu Takayanagi

    2012-09-01

    Full Text Available One of the techniques for augmentation mammaplasty is the procedure using implants. Eventhough this technique has been used for many years, there are still several controversial issuesto be discussed and overcome for patient safety. In this review article, capsular contracture,leak or rupture of the implants, possible systemic disease, relation with breast cancer, andrecent problems with Poly Implant Prothese implants are described and discussed.

  17. AOX determination in industrial waste water according to EN 1485, DEV H14. Experience with high salt freights and interfering organic matter; AOX-Bestimmungen in Industrieabwaessern nach EN 1485, DEV H14 Erfahrungen mit hohen Salzfrachten und organischen Stoerstoffen

    Energy Technology Data Exchange (ETDEWEB)

    Helmreich, B. [Technische Univ. Muenchen, Garching (Germany). Lehrstuhl und Pruefamt fuer Wasserguete- und Abfallwirtschaft

    1999-07-01

    AOX determination in industrial waste water is not always trivial on account of high salt freights or high organic loads. Interfering substances of inorganic or organic nature can cause increases or decreases of readings that often are not plausible or reproducible. In most cases the AOX enrichment step is limiting to quantitative analysis. In the present work, enrichment in two industrial waste waters was critically assessed according to EN 1485 DEV H14. In addition, experience with the enrichment method according to Dr. Lange is reported. For the elimination of high salt freights beside a low organic concentration, cleanup by means of solid-phase extraction is considered. The results suggest that the standardized procedure is not universally applicable to any type of sample. However, appropriate action can minimize flaws of enrichment and, thereby, AOX determination. (orig.) [German] Die AOX-Bestimmung aus Industrieabwaessern ist aufgrund hoher Salzfrachten oder hoher organischer Belastungen nicht immer trivial. Stoerstoffe anorganischer wie auch organischer Art koennen zu Mehr- oder Minderbefunden fuehren, die oft nicht plausibel und reproduzierbar sind. In den meisten Faellen ist der Anreicherungsschritt des AOX fuer die quantitative Analyse limitierend. In der vorliegenden Arbeit wurde die Anreicherung nach den EN 1485 DEV H14 fuer zwei Industrieabwaesser kritisch betrachtet. Zudem werden Erfahrungen mit der Anreicherungsmethode nach Dr. Lange vorgestellt. Zur Entfernung hoher Salzfrachten neben einer geringen organischen Konzentration wurde ein Clean-up mittels Festphasenextraktion betrachtet. Die Ergebnisse legen nahe, dass das genormte Verfahren nicht universell auf jeden Probentyp anwendbar ist. Durch ein gezieltes Vorgehen koennen jedoch Fehler bei der Anreicherung und damit bei der AOX-Bestimmung minimiert werden. (orig.)

  18. Functional CT imaging of the lung in the axial and coronal plane after single-lung transplantation; Computertomographische Funktionsuntersuchung der Lunge nach einseitiger Lungentransplantation mit axialer und koronarer Akquisition

    Energy Technology Data Exchange (ETDEWEB)

    Kauczor, H.U. [Mainz Univ. (Germany). Klinik fuer Radiologie; Buchenroth, M. [Mainz Univ. (Germany). 3. Medizinische Klinik - Pneumologie; Heussel, C.P. [Mainz Univ. (Germany). Klinik fuer Radiologie; Mayer, E. [Mainz Univ. (Germany). Klinik fuer Herz-, Thorax-, Gefaesschirurgie

    1996-05-01

    After single-lung transplantation in a patient suffering from obstructive emphysema lung function parameters worsened during follow-up. To conplement the routine high-resolution CT (HRCT) scans acquired in inspiration, additional scans were obtained to evaluate regional lung function. The comparison of HRCT scans acquired in inspiration and in expiration revealed different ventilation conditions of both lungs, continuous acquisition in a single slice (dynamic multiscan acquisition) in the axial and coronal plane demonstrated mediastinal shifting and the movement of the diaphragm during the whole breathing cycle. Both modalities can provide important information concerning regional differences of ventilation after single-lung transplantation. Expiratory HRCT should be applied on a regular basis in the follow-up of patients after single-lung transplantation. Expiratory HRCT should be applied on a regular basis in the follow-up of patients after single-lung transplantation. The application of axial and coronal dynamic multiscan acquisitions will be helpful in particular clinical conditions, like increasing hyperinflation, mediastinal shifting or bronchial collapse within the region of the anastomosis. (orig.) [Deutsch] Nach Einzellungentransplantation wegen eines obstruktiven Emphysems wurden bei einem Patienten in der Nachsorge zur Abklaerung einer Verschlechterung der Lungenfunktionsparameter neben einer hochaufloesenden CT (HRCT) in Inspiration zusaetzliche Aufnahmen zur Funktionsbeurteilung durchgefuehrt. Der Vergleich von HRCT-Aufnahmen in In- und Exspiration zeigte die unterschiedlichen Ventilationsverhaeltnisse bei beiden Lungen; kontinuierliche Aufnahmen in einer Schicht (Multirotationsaufnahmen) stellten bei axialer und insbesondere bei direkter koronarer Akquisition die Mediastinal- und Zwerchfellbewegung waehrend des gesamten Atemzyklus dar. Beide Verfahren koennen wichtige Zusatzinformationen ueber regionale Ventilationsdifferenzen nach einseitiger

  19. Prevalence of peri-implant disease on platform switching implants: a cross-sectional pilot study.

    Science.gov (United States)

    Duque, Andrés Duque; Aristizabal, Astrid Giraldo; Londoño, Susana; Castro, Lida; Alvarez, Luis Gonzalo

    2016-01-01

    The objective of this study was to assess the prevalence of mucositis and peri-implantitis associated with the use of two types of implants-conventional versus platform switching after one year of loading. A longitudinal study of 64 implants in 25 patients was performed. Clinical variables, such as clinical pocket depth and bleeding upon probing, plaque, mobility, gingival recession, clinical attachment loss, and radiographic bone loss, were analyzed. The case definition for peri-implantitis was established as pockets of ≥ 5 mm with bleeding and bone loss ≥ 2 mm. One year after implant loading, the prevalence of mucositis and peri-implantitis with conventional implants (CIs) was 81.2% and 15.6%, respectively. For platform switching implants (PSIs) the prevalence was 90% and 6.6%, respectively. These differences were not statistically significant (p = 0.5375). However, there was a trend towards a lower prevalence of peri-implantitis with platform switching Implants.

  20. [The elementary discussion on digital implant dentistry].

    Science.gov (United States)

    Su, Y C

    2016-04-09

    It is a digital age today. Exposed to all kinds of digital products in many fields. Certainly, implant dentistry is not exception. Digitalization could improve the outcomes and could decrease the complications of implant dentistry. This paper introduces the concepts, definitions, advantages, disadvantages, limitations and errors of digital implant dentistry.

  1. The Case for a Generic Implant Processor

    NARCIS (Netherlands)

    Strydis, C.; Gaydadjiev, G.N.

    2008-01-01

    A more structured and streamlined design of implants is nowadays possible. In this paper we focus on implant processors located in the heart of implantable systems. We present a real and representative biomedical-application scenario where such a new processor can be employed. Based on a suitably

  2. Factors Influencing Early Dental Implant Failures.

    Science.gov (United States)

    Chrcanovic, B R; Kisch, J; Albrektsson, T; Wennerberg, A

    2016-08-01

    The purpose of the present study was to assess the influence of local and systemic factors on the occurrence of dental implant failures up to the second-stage surgery (abutment connection). This retrospective study is based on 2,670 patients who received 10,096 implants and were consecutively treated with implant-supported prostheses between 1980 and 2014 at 1 specialist clinic. Several anatomic-, patient-, health-, and implant-related factors were collected. Descriptive statistics were used to describe the patients and implants. Univariate and multivariate logistic regression models were used at the patient level as well as the implant level to evaluate the effect of explanatory variables on the failure of implants up to abutment connection. A generalized estimating equation method was used for the implant-level analysis to account for the fact that repeated observations (several implants) were available for a single patient. Overall, 642 implants (6.36%) failed, of which 176 (1.74%) in 139 patients were lost up to second-stage surgery. The distribution of implants in sites of different bone quantities and qualities was quite similar between implants lost up to and after abutment connection. Smoking and the intake of antidepressants were the statistically significant predictors in the multivariate model (ClinicalTrials.gov NCT02369562). © International & American Associations for Dental Research 2016.

  3. Tumor Localization Using Radio Frequency Implants

    Science.gov (United States)

    2006-09-01

    the implant size. With respect to implant size, the size should be comparable to brachytherapy seed implants. Therefore, an estimate for the size of...conductors is described by (7) where z is the propagation distance, δ is the skin depth, ω is the angular frequency, σ is the conductivity, and µ is the

  4. [Radioactive burden resulting from zirconia implants].

    Science.gov (United States)

    Fischer-Brandies, E; Pratzel, H; Wendt, T

    1991-10-01

    Due to its mechanical properties circonia is an interesting implantation material. However, it may contain a certain amount of radioactive isotopes. The measurement of alpha-emission reveals varying amounts of radiation. As a result, a declaration of radioactivity should be required for circonia implants and only circonia with low emission levels should be used for implantation purposes.

  5. The endometrial factor in human embryo implantation

    NARCIS (Netherlands)

    Boomsma, C.M.

    2009-01-01

    The studies presented in this thesis aimed to explore the role of the endometrium in the implantation process. At present, embryo implantation is the major rate-limiting step for success in fertility treatment. Clinicians have sought to develop clinical interventions aimed at enhancing implantation

  6. Surgical Templates for Dental Implant Positioning; Current ...

    African Journals Online (AJOL)

    Surgical templates for dental implant. 5. Nigerian Journal of Surgery. Jan‑Jun 2015 | Volume 21 | Issue 1. 18. Tarlow JL. Fabrication of an implant surgical stent for the edentulous mandible. J Prosthet Dent 1992;67:217‑8. 19. Stellino G, Morgano SM, Imbelloni A. A dual‑purpose, implant stent made from a provisional fixed ...

  7. Active implants and scaffolds for tissue regeneration

    CERN Document Server

    Zilberman, Meital

    2011-01-01

    Active implants are actually drug or protein-eluting implants that induce healing effects, in addition to their regular task, such as support. This book gives a broad overview of biomaterial platforms used as basic elements of drug-eluting implants.

  8. Semiconductor applications of plasma immersion ion implantation ...

    Indian Academy of Sciences (India)

    Many semiconductor integrated circuit manufacturing processes require high dose of implantation at very low energies. Conventional beam line ion implantation system suffers from low beam current at low energies, therefore, cannot be used economically for high dose applications. Plasma immersion ion implantation (PIII) ...

  9. Simple, quick, and efficient implant placement jig

    Directory of Open Access Journals (Sweden)

    Nikhil Narayan Pai

    2015-01-01

    Full Text Available Implants have become an inherent part of everyday orthodontic practice, but unlike prosthodontic implants, their placement and insertion into narrow interradicular spaces for orthodontic purposes remain a tricky and challenging part to most clinicians. An innovative and clinically useful method has been described here for safe and easy insertion of mini-implants.

  10. Local recurrent and metastatic malignant melanoma. Long-term results and prognostic factors following percutaneous radiotherapy; Lokal rezidiviertes und metastasiertes malignes Melanom. Langzeitergebnisse und Prognosefaktoren nach perkutaner Radiotherapie

    Energy Technology Data Exchange (ETDEWEB)

    Seegenschmiedt, M.H. [Erlangen-Nuernberg Univ. (Germany). Klinik fuer Strahlentherapie; Alfried-Krupp-von-Bohlen-und-Halbach-Krankenhaus, Essen (Germany). Klinik fuer Radioonkologie, Strahlentherapie und Nuklearmedizin; Keilholz, L.; Pieritz, A.; Urban, A.; Sauer, R. [Erlangen-Nuernberg Univ. (Germany). Klinik fuer Strahlentherapie; Altendorf-Hofmann, A.; Hohenberger, W. [Erlangen-Nuernberg Univ. (Germany). Klinik fuer Chirurgie; Schell, H. [Erlangen-Nuernberg Univ. (Germany). Klinik fuer Dermatologie

    1999-09-01

    subtype had no impact. In multivariate analysis, UICC stage was the only independent favorable prognostic factor for achievement of CR and long-term survival (p<0.001). Conclusion: External RT provides effective palliation in advanced UICC stages. The UICC staging system is a good predictor of initial and long-term tumor response in metastatic MM. Prospective randomized trials using RT with or without adjuvant therapy for advanced MM are justified. (orig.) [German] Hintergrund: Die perkutane Radiotherapie wird oft nur als 'Ultima ratio' bei Patienten mit fortgeschrittenem malignen Melanom (MM) eingesetzt. Unsere Studie wertet 20 Jahre klinische Erfahrungen bei fortgeschrittenem, rezidivierten und metastasierten malignen Melanom sowie Endpunkte und Prognosefaktoren aus. Patienten und Methodik: Von 1977 bis 1995 wurde bei 121 Patienten (56 Frauen, 65 Maennern) von 2 917 Patienten des oertlichen Melanomregisters die Indikation fuer eine palliative Radiotherapie bei fortgeschrittenem malignen Melanom gestellt. Zu Beginn der Radiotherapie hatten elf Patienten inoperable Primaer- oder Rezidivtumoren oder wiesen postoperativ Tumorreste (R2) auf (UICC IIB); 57 Patienten hatten Lymphknoten- (n=33) oder In-transit-Metastasen (n=24) (UICC III): 53 hatten Fernmetastasen (sieben M1a; 46 M1b) (UICC IV). Von der Erstdiagnose bis zum Beginn der Strahlentherapie vergingen im Mittel 19 (median: 18; Spanne: drei bis 186) Monate. Bei 77 Patienten wurde eine konventionell fraktionierte Radiotherapie und bei 44 Patienten ein hypofraktionierte Radiotherapie mit Einzeldosen von 2 bis 6 Gy und einer mittleren Gesamtdosis von 45 (median: 48; Spanne: 20 bis 66) Gy appliziert. Ergebnisse: Eine komplette (CR) und/oder partielle Remission (CR+PR) nach drei Monaten erzielten sieben (64%) bzw. alle Patienten im Stadium UICC IIB, 25 (44%) bzw. 44 (77%) im Stadium UICC III und neun (17%) bzw. 26 (49%) im Stadium UICC IV. Bei 25 (21%) Patienten war der Tumor progredient. Patienten, die eine CR

  11. Air Abrasive Disinfection of Implant Surfaces in a Simulated Model of Peri-Implantitis

    Science.gov (United States)

    2016-06-01

    implantitis is an emerging complication leading to increased morbidity or mortality of osseointegrated implants. The prevalence of peri-implant...the implant specific impression coping and screw. The simulated defect model served as both the reservoir for the contaminant and site where...by first placing an impression coping into a resin model previously numbered with an indelible marker (1-26). The implant was removed from its

  12. Auditory brainstem implant program development.

    Science.gov (United States)

    Schwartz, Marc S; Wilkinson, Eric P

    2017-08-01

    Auditory brainstem implants (ABIs), which have previously been used to restore auditory perception to deaf patients with neurofibromatosis type 2 (NF2), are now being utilized in other situations, including treatment of congenitally deaf children with cochlear malformations or cochlear nerve deficiencies. Concurrent with this expansion of indications, the number of centers placing and expressing interest in placing ABIs has proliferated. Because ABI placement involves posterior fossa craniotomy in order to access the site of implantation on the cochlear nucleus complex of the brainstem and is not without significant risk, we aim to highlight issues important in developing and maintaining successful ABI programs that would be in the best interests of patients. Especially with pediatric patients, the ultimate benefits of implantation will be known only after years of growth and development. These benefits have yet to be fully elucidated and continue to be an area of controversy. The limited number of publications in this area were reviewed. Review of the current literature was performed. Disease processes, risk/benefit analyses, degrees of evidence, and U.S. Food and Drug Administration approvals differ among various categories of patients in whom auditory brainstem implantation could be considered for use. We suggest sets of criteria necessary for the development of successful and sustaining ABI programs, including programs for NF2 patients, postlingually deafened adult nonneurofibromatosis type 2 patients, and congenitally deaf pediatric patients. Laryngoscope, 127:1909-1915, 2017. © 2016 The American Laryngological, Rhinological and Otological Society, Inc.

  13. Advancing Binaural Cochlear Implant Technology.

    Science.gov (United States)

    Dietz, Mathias; McAlpine, David

    2015-12-30

    This special issue contains a collection of 13 papers highlighting the collaborative research and engineering project entitled Advancing Binaural Cochlear Implant Technology-ABCIT-as well as research spin-offs from the project. In this introductory editorial, a brief history of the project is provided, alongside an overview of the studies. © The Author(s) 2015.

  14. Advancing Binaural Cochlear Implant Technology

    Directory of Open Access Journals (Sweden)

    Mathias Dietz

    2015-12-01

    Full Text Available This special issue contains a collection of 13 papers highlighting the collaborative research and engineering project entitled Advancing Binaural Cochlear Implant Technology—ABCIT—as well as research spin-offs from the project. In this introductory editorial, a brief history of the project is provided, alongside an overview of the studies.

  15. Reading skills after cochlear implantation

    NARCIS (Netherlands)

    Vermeulen, Agnes Maria

    2007-01-01

    It has frequently been found that profoundly deaf children with conventional hearing aids have difficulties with the comprehension of written text. Cochlear Implants (CIs) were expected to enhance the reading comprehension of these profoundly deaf children because they provide auditory access to

  16. Cortical plasticity after cochlear implantation

    DEFF Research Database (Denmark)

    Petersen, B; Gjedde, A; Wallentin, M

    2013-01-01

    The most dramatic progress in the restoration of hearing takes place in the first months after cochlear implantation. To map the brain activity underlying this process, we used positron emission tomography at three time points: within 14 days, three months, and six months after switch-on. Fifteen...

  17. Cochlear implant optimized noise reduction

    Science.gov (United States)

    Mauger, Stefan J.; Arora, Komal; Dawson, Pam W.

    2012-12-01

    Noise-reduction methods have provided significant improvements in speech perception for cochlear implant recipients, where only quality improvements have been found in hearing aid recipients. Recent psychoacoustic studies have suggested changes to noise-reduction techniques specifically for cochlear implants, due to differences between hearing aid recipient and cochlear implant recipient hearing. An optimized noise-reduction method was developed with significantly increased temporal smoothing of the signal-to-noise ratio estimate and a more aggressive gain function compared to current noise-reduction methods. This optimized noise-reduction algorithm was tested with 12 cochlear implant recipients over four test sessions. Speech perception was assessed through speech in noise tests with three noise types; speech-weighted noise, 20-talker babble and 4-talker babble. A significant speech perception improvement using optimized noise reduction over standard processing was found in babble noise and speech-weighted noise and over a current noise-reduction method in speech-weighted noise. Speech perception in quiet was not degraded. Listening quality testing for noise annoyance and overall preference found significant improvements over the standard processing and over a current noise-reduction method in speech-weighted and babble noise types. This optimized method has shown significant speech perception and quality improvements compared to the standard processing and a current noise-reduction method.

  18. Ovarian stimulation, endometrium and implantation

    Directory of Open Access Journals (Sweden)

    mandana Beigi Boroujeni

    2011-03-01

    Full Text Available In the Paper article, the collection of the studies related to the effect of ovarian stimulation on endometrium of uterus and implantation have been investigated. History: Monash group used ovarian stimulation method for the first time in infertility treatment and also, they could increase the pregnancy rate using this method. However, the percentage of successful embryonic implantation has been decreased by this method due to imbalance of hormones and the effect of these hormonal changes on endometrium. Materials and Methods: Studies done by researchers have shown that ovarian stimulation causes undesirable changes in endometrium which in turn such alterations lead to inadequate attachment of embryo to endometrium and finally decrease the percentage of embryonic implantation. Conclusion: Based on several researches and the importance of using the ovarian stimulation method in treatment of infertility, also due to undesirable effects that ovarian stimulation has on endometrium during embryonic implantation it is inevitable that more investigations should be done for improvement of treatment methods in infertility clinics.

  19. Digital planning of cranial implants

    NARCIS (Netherlands)

    van der Meer, Wicher J.; Bos, Ruud R. M.; Vissink, Arjan; Visser, Anita

    Computer-aided techniques can be used in the reconstruction of defects in the skull, although there are limitations for large defects. We describe a technique for the digital design of an implant for cranioplasty using one, easy-to-use, piece of generic industrial software that shows a

  20. Pegging the porous orbital implant.

    Science.gov (United States)

    Johnson, Royce L C; Ramstead, Cory L; Nathoo, Nawaaz

    2011-01-01

    Hydroxyapatite (HA) orbital implants are commonly used for the anophthalmic socket. With a HA implant, if motility is not satisfactory then a peg system can be surgically placed in attempts to improve motility. The authors report the technique and results of 83 patients who received motility peg placement over an 8-year period by a single surgeon. Retrospective chart review of all patients with previous enucleation with either primary or secondary insertion of a HA implant who received a motility peg by a single oculoplastic surgeon between January 1999 and February 2007. Eighty-three patients underwent placement of a titanium peg and sleeve during the study period. Complications seen in the follow-up period included discharge, pyogenic granuloma, and others. Infection was experienced in 1 case. Fourteen patients (17%) required further surgical management due to complications. The largely positive results of this moderately sized case series validates the efficacy of pegging a hydroxyapatite orbital implant with minor risk of serious complications; this may have been due to a combination of factors including an experienced surgeon and adequate follow-up. As a procedure that can be completed in a hospital or minor surgical suite with sedation, it remains a viable option for many patients.

  1. Factors influencing severity of peri-implantitis.

    Science.gov (United States)

    Saaby, Martin; Karring, Eva; Schou, Søren; Isidor, Flemming

    2016-01-01

    To retrospectively assess the influence of potential risk factors, primarily smoking and a prior history of periodontitis, on the severity of peri-implantitis in patients referred for treatment of peri-implantitis. Among 98 patients referred for treatment of peri-implantitis, 34 patients fulfilled the inclusion criteria: one or several implants with peri-implant marginal bone loss ≥2 mm concomitant with bleeding and/or pus on probing. Information about health status, smoking habits, reason for tooth loss, and performed implant treatment were obtained from the patient charts and interviews. Moreover, a detailed extra- and intraoral examination was performed, including intraoral radiographs of all implants. Risk factors were evaluated by a two-way anova at patient level. Smoking and a prior history of periodontitis were significant risk factors for increased severity of peri-implantitis. Furthermore, the presence of both smoking and a prior history of periodontitis did not further increase the severity of peri-implantitis, as compared to either of these two factors alone. Poor marginal fit of the suprastructure and extensive gingival imitations on implant-supported fixed full prostheses may also be potential risk factors. The study indicated that smoking and a prior history of periodontitis were important risk factors for increased severity of peri-implantitis, while concomitant presence of these two risk factors did not further increase the severity of peri-implantitis, as compared to either of these two risk factors alone. Therefore, early diagnosis and adequate treatment of peri-implantitis are important in patients with a prior history of periodontitis and in smokers to minimize the risk of advanced peri-implantitis in conjunction with focus on known risk factors, including meticulous infection control before implant treatment and a systematic maintenance care program. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  2. Failure analysis of fractured dental zirconia implants.

    Science.gov (United States)

    Gahlert, M; Burtscher, D; Grunert, I; Kniha, H; Steinhauser, E

    2012-03-01

    The purpose of the present study was the macroscopic and microscopic failure analysis of fractured zirconia dental implants. Thirteen fractured one-piece zirconia implants (Z-Look3) out of 170 inserted implants with an average in situ period of 36.75±5.34 months (range from 20 to 56 months, median 38 months) were prepared for macroscopic and microscopic (scanning electron microscopy [SEM]) failure analysis. These 170 implants were inserted in 79 patients. The patient histories were compared with fracture incidences to identify the reasons for the failure of the implants. Twelve of these fractured implants had a diameter of 3.25 mm and one implant had a diameter of 4 mm. All fractured implants were located in the anterior side of the maxilla and mandibula. The patient with the fracture of the 4 mm diameter implant was adversely affected by strong bruxism. By failure analysis (SEM), it could be demonstrated that in all cases, mechanical overloading caused the fracture of the implants. Inhomogeneities and internal defects of the ceramic material could be excluded, but notches and scratches due to sandblasting of the surface led to local stress concentrations that led to the mentioned mechanical overloading by bending loads. The present study identified a fracture rate of nearly 10% within a follow-up period of 36.75 months after prosthetic loading. Ninety-two per cent of the fractured implants were so-called diameter reduced implants (diameter 3.25 mm). These diameter reduced implants cannot be recommended for further clinical use. Improvement of the ceramic material and modification of the implant geometry has to be carried out to reduce the failure rate of small-sized ceramic implants. Nevertheless, due to the lack of appropriate laboratory testing, only clinical studies will demonstrate clearly whether and how far the failure rate can be reduced. © 2011 John Wiley & Sons A/S.

  3. Effectiveness of Implant Therapy Analyzed in a Swedish Population: Prevalence of Peri-implantitis.

    Science.gov (United States)

    Derks, J; Schaller, D; Håkansson, J; Wennström, J L; Tomasi, C; Berglundh, T

    2016-01-01

    Peri-implantitis is an inflammatory disease affecting soft and hard tissues surrounding dental implants. As the global number of individuals that undergo restorative therapy through dental implants increases, peri-implantitis is considered as a major and growing problem in dentistry. A randomly selected sample of 588 patients who all had received implant-supported therapy 9 y earlier was clinically and radiographically examined. Prevalence of peri-implantitis was assessed and risk indicators were identified by multilevel regression analysis. Forty-five percent of all patients presented with peri-implantitis (bleeding on probing/suppuration and bone loss >0.5 mm). Moderate/severe peri-implantitis (bleeding on probing/suppuration and bone loss >2 mm) was diagnosed in 14.5%. Patients with periodontitis and with ≥4 implants, as well as implants of certain brands and prosthetic therapy delivered by general practitioners, exhibited higher odds ratios for moderate/severe peri-implantitis. Similarly, higher odds ratios were identified for implants installed in the mandible and with crown restoration margins positioned ≤1.5 mm from the crestal bone at baseline. It is suggested that peri-implantitis is a common condition and that several patient- and implant-related factors influence the risk for moderate/severe peri-implantitis (ClinicalTrials.gov NCT01825772). © International & American Associations for Dental Research 2015.

  4. Late exposure of the bioceramic orbital implant.

    Science.gov (United States)

    Wang, Jia-Kang; Lai, Pei-Ching; Liao, Shu Lang

    2009-01-01

    To investigate the long-term outcome of the Bioceramic orbital implant. A retrospective, comparative, nonrandomized study. Data were collected from the patients receiving Bioceramic orbital implants at National Taiwan University Hospital between June 1, 2001 and November 1, 2005. The implant was wrapped with Vicryl mesh, adding anteriorly with a scleral patch graft following enucleation with primary or secondary implantation. The unwrapped implant was inserted into an eviscerated globe with posterior sclerotomy and cornea preserved. Primary or secondary placement of sleeve was performed in some patients. A total of 112 cases were reviewed. Four patients were excluded attributable to insufficient follow-up. The other 108 patients had a mean follow-up period of 35.8 +/- 10.6 months (range, 24 to 70 months). Fifty patients (46.3%) received the pegging procedure. Eight of 108 (7.4%) cases of late exposure were identified on average 20.7 months after implantation. We identified no cases of implant exposure in 30 cases of enucleation and eight cases of secondary implant when the implant was wrapped in Vicryl mesh and an anterior scleral cap was used. All exposures developed in eviscerated patients (70 cases): two without pegging, three with primary placement, and three with secondary placement of the sleeve. The exposure rate was higher in patients with eviscerated globes, pegged implants, and prior ocular operations (P pegging, and prior ocular surgeries. The modified wrapping technique can prevent exposure following secondary implantation and enucleation.

  5. Early History and Challenges of Implantable Electronics.

    Science.gov (United States)

    Ko, Wen H

    2012-06-01

    Implantable systems for biomedical research and clinical care are now a flourishing field of activities in academia as well as industrial institutions. The broad field includes experimental explorations in electronics, mechanical, chemical, and biological components and systems, and the combination of all these. Today virtually all implants involve both electronic circuits and micro-electro-mechanical-systems (MEMS). This article offers a very brief glance back at the early history of implant electronics in the period from the 1950s to the 1970s, by employing selected examples from the author's research. This short review also discusses the challenges of implantable electronics at present, and suggests some potentially important trends in the future research and development of implantable microsystems. It is aimed as an introduction of implantable/attached electronic systems to research engineers that are interested in implantable systems as a section of Biomedical Instrumentations.

  6. Surface modification of implants in long bone

    Science.gov (United States)

    Förster, Yvonne; Rentsch, Claudia; Schneiders, Wolfgang; Bernhardt, Ricardo; Simon, Jan C.; Worch, Hartmut; Rammelt, Stefan

    2012-01-01

    Coatings of orthopedic implants are investigated to improve the osteoinductive and osteoconductive properties of the implant surfaces and thus to enhance periimplant bone formation. By applying coatings that mimic the extracellular matrix a favorable environment for osteoblasts, osteoclasts and their progenitor cells is provided to promote early and strong fixation of implants. It is known that the early bone ongrowth increases primary implant fixation and reduces the risk of implant failure. This review presents an overview of coating titanium and hydroxyapatite implants with components of the extracellular matrix like collagen type I, chondroitin sulfate and RGD peptide in different small and large animal models. The influence of these components on cells, the inflammation process, new bone formation and bone/implant contact is summarized. PMID:23507866

  7. Dynamics of bone graft healing around implants

    Directory of Open Access Journals (Sweden)

    Narayan Venkataraman

    2015-01-01

    A few questions arise pertaining to the use of bone grafts along with implants are whether these are successful in approximation with implant. Do they accelerate bone regeneration? Are all defects ultimately regenerated with new viable bone? Is the bone graft completely resorbed or integrated in new bone? Does the implant surface characteristic positively affect osseointegration when used with a bone graft? What type of graft and implant surface can be used that will have a positive effect on the healing type and time? Finally, what are the dynamics of bone graft healing around an implant? This review discusses the cellular and molecular mechanisms of bone graft healing in general and in vicinity of another foreign, avascular body, namely the implant surface, and further, the role of bone grafts in osseointegration and/or clinical success of the implants.

  8. Congenitally Deafblind Children and Cochlear Implants

    DEFF Research Database (Denmark)

    Dammeyer, Jesper Herup

    2008-01-01

    There has been much research conducted demonstrating the positive benefits of cochlear implantation (CI) in children who are deaf. Research on cochlear implantation in children who are both deaf and blind, however, is lacking. The purpose of this article is to present a study of 5 congenitally...... deafblind children who received cochlear implants between 2.2 and 4.2 years of age.  Ratings of video observations were used to measure the children's early communication development with and without the use of their cochlear implants. In addition, parental interviews were used to assess the benefits...... parents perceived regarding their children's cochlear implants. Two examples are included in this article to illustrate the parents' perspectives about cochlear implantation in their deafblind children. Benefits of cochlear implantation in this cohort of children included improved attention and emotional...

  9. Mineralization kinetics of various implanted bioceramics

    Science.gov (United States)

    Derrien, A. C.; Oudadesse, H.; Martin, S.; Lucas-Girot, A.; Cathelineau, G.; Sauvage, T.; Blondiaux, G.

    2004-11-01

    Proton induced X-ray emission was used for a multi-element analysis of three biomaterials implanted in ovine thighbone: one tri-tricalcic phosphate and two calcium carbonates with different percentages of porosity. The proton PIXE analysis method allowed the simultaneous quantification of several elements to get profiles of concentrations versus implantation delay. We focused on calcium and phosphorous which were major elements of the bony matrix and strontium, a trace element characteristic of the mineralization of the implants. Concentrations of calcium (constitutive of CaCO3 and TCP) and phosphorous (constitutive of TCP) were known and differed from the bony matrix concentrations. The analysis of each sample for various times after implantation (1, 3, 6 and 12 months) by PIXE permitted to observe the evolution of the concentration of Ca, P and Sr in the implant area and at the interface implant/bone and to compare the different biomaterials implanted.

  10. Principles of occlusion in implant dentistry

    Directory of Open Access Journals (Sweden)

    Mahesh Verma

    2015-01-01

    Full Text Available Dental implants require different biomechanical considerations from natural teeth. Also, with one of the criteria for long-term implant success being “occlusion,” it becomes imperative for the clinician to be well versed with the different concepts when rehabilitating with an implant prosthesis. All endeavors must be made to reduce the overload and noxious forces on implants during mandibular movements. The occlusal rehabilitation schemes for implant-supported prostheses are derivatives of the occlusal scheme for natural dentition. The implant-protected occlusion (IPO scheme has been designed to ensure the longevity of both prosthesis and implant. The article reviews the concepts of IPO and their applicability in different clinical scenarios.

  11. Immediate implants for aesthetic success: New guidelines

    Directory of Open Access Journals (Sweden)

    Monish Bhola

    2015-01-01

    Full Text Available Immediate implant placement in extraction sockets is well-documented. There is adequate long-term evidence that immediate implants have survival rates similar to delayed placement. Additionally, immediate implants also help preserve the crestal bone and minimize soft tissue changes in the aesthetic zone. The decision to extract teeth and replace them with implants is determined by many factors. While implant insertion at the time of tooth extraction is desirable for a number of reasons, extraction socket morphology, soft tissue biotype, presence of infection, health of the bone and soft tissue, and other factors help determine if the site is ideal for immediate implant placement or not. This article will review some key and new guidelines for immediate implant placement in the aesthetic zone for long-term success and stability.

  12. Quality of Life in Pediatric Cochlear Implantations.

    Science.gov (United States)

    Yorgun, Meysem; Sürmelioğlu, Özgür; Tuncer, Ülkü; Tarkan, Özgür; Özdemir, Süleyman; Çekiç, Erdinç; Çetik, Fikret; Kıroğlu, Mete

    2015-12-01

    To evaluate the satisfaction of patients with a cochlear implant using a Parents' Perspective Questionnaire and analyze the significant parameters. Patients who received a cochlear implant in Çukurova University between March 2002 and November 2012 were included in the study. Parents were asked to answer the Parents' Perspective Questionnaire. The age ranges of 62 patients were 2-5 years and of 99 patients were 6-11 years and over. In total, 144 parents were satisfied with the cochlear implant. Patients who attended school had more self-confidence, and users of an implant aged over 18 months had better social relations and self-confidence. Cochlear implants' positive effect on the quality of life is a fact, but parents have concerns in the preoperative and postoperative periods. Patients and parents should be informed carefully about cochlear implants. Also, patients' satisfaction is correlated with increasing duration of the implant and age.

  13. A clinical example of extreme dose exposure for an implanted cardioverter-defibrillator. Beyond the DEGRO guidelines

    Energy Technology Data Exchange (ETDEWEB)

    Hristova, Yoana; Koehn, Janett; Preuss, Stefanie [Johann Wolfgang Goethe University Frankfurt, Department of Radiation Oncology, University Hospital, Frankfurt (Germany); Roedel, Claus; Balermpas, Panagiotis [Johann Wolfgang Goethe University Frankfurt, Department of Radiation Oncology, University Hospital, Frankfurt (Germany); German Cancer Research Center (DKFZ), Heidelberg (Germany); German Cancer Consortium (DKTK), Frankfurt am Main (Germany)

    2017-09-15

    Considering that the number of malignant diseases in patients over 65 years of age is increasing, it often occurs that patients who carry a cardiac implanted electronic device must undergo radiotherapy. Ionizing radiation can disturb the function of the implantable cardioverter-defibrillator (ICD). As a result of this, an update of the DEGRO/DKG guidelines for radiotherapy of this patient group has been published. We report the case of a patient with an ICD and T-lymphoblastic lymphoma with cardiac involvement, who received i.a. a total body irradiation with 8 Gy followed by a consolidating radiotherapy of the pericardium with 14 Gy as well as additional radiotherapy courses after consecutive recurrences. For the purposes of the treatment, the antitachyarrhythmia (ATA) therapy was deactivated and temporarily replaced through a life vest. According to the current DEGRO guidelines for irradiation of patients with cardiac implanted electronic devices, a categorization of the patient in the ''high-risk'' group was made. Furthermore, regular telemetric checks of the ICD device were performed before and after treatment. Despite unavailable declaration of the manufacturer regarding the cumulative tolerable dose and DEGRO recommendation for a cumulative dose <2 Gy, the aftercare was unproblematic and normal values were assessed for all relevant ICD parameters, despite a cumulative dose >10 Gy in the device. This case shows that if the cardiac implanted electronic devices are not directly irradiated und the energy used is reduced to 6 MV, irradiation-induced damage is less likely and can possibly be prevented. (orig.) [German] Vor dem Hintergrund der steigenden Zahl von Krebserkrankungen bei Patienten ueber 65 Jahren kommt es haeufig vor, dass sich Patienten mit einem kardialen implantierten elektronischen Geraet einer Strahlentherapie unterziehen muessen. Ionisierende Strahlung kann die Funktion des implantierbaren Kardioverter-Defibrillators (ICD

  14. [Auditory performance analyses of cochlear implanted patients].

    Science.gov (United States)

    Ozdemir, Süleyman; Kıroğlu, Mete; Tuncer, Ulkü; Sahin, Rasim; Tarkan, Ozgür; Sürmelioğlu, Ozgür

    2011-01-01

    The aim of this study was to analyze the auditory performance development of cochlear implanted patients. The effects of age at implantation, gender, implanted ear and model of the cochlear implant on the patients' auditory performance were investigated. Twenty-eight patients (12 boys, 16 girls) with congenital prelingual hearing loss who underwent cochlear implant surgery at our clinic and a follow-up of at least 18 months were selected for the study. Listening Progress Profile (LiP), Monosyllable-Trochee-Polysyllable (MTP) and Meaningful Auditory Integration Scale (MAIS) tests were performed to analyze the auditory performances of the patients. To determine the effect of the age at implantation on the auditory performance, patients were assigned into two groups: group 1 (implantation age = or <60 months, mean 44.8 months) and group 2 (implantation age = or <60 months, mean 100.6 months). Group 2 had higher preoperative test scores than group 1 but after cochlear implant use, the auditory performance levels of the patients in group 1 improved faster and equalized to those of the patients in group 2 after 12-18 months. Our data showed that variables such as sex, implanted ear or model of the cochlear implant did not have any statistically significant effect on the auditory performance of the patients after cochlear implantation. We found a negative correlation between the implantation age and the auditory performance improvement in our study. We observed that children implanted at young age had a quicker language development and have had more success in reading, writing and other educational skills in the future.

  15. Single vs 2 Implants on Peri-implant Marginal Bone Level and Implant Failures in Mandibular Implant Overdentures: A Systematic Review With Meta-analysis.

    Science.gov (United States)

    Ahmed Elawady, Dina Mohamed; Kaddah, Amal Fathy; Talaat Khalifa, Mohamed

    2017-09-01

    As a consensus, the 2-implant supported overdentures (ODs) are considered as the first choice of treatment for the edentulous mandible. In the same context, there is increased evidence supporting the use of single-implant OD. The aim of any design is to preserve the remaining structures and allow the longevity of the treatment. To evaluate the impact of single implant vs 2 implants on the peri-implant marginal bone loss (MBL) and number of implant failures in mandibular implant overdentures. A literature search of electronic databases (PubMed and Cochrane) was performed up to March 2016 and complemented by hand search. Randomized clinical trials (RCTs) that evaluated MBL and number of implant failures relative to single-implant mandibular overdenture (MOD) were selected. The review and meta-analysis were performed using meta-analytic statistical package and in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Five RCTs met the inclusion criteria for systematic review and qualitative synthesis. The observation period ranged from 12 months to 5 years in the selected RCTs. The comparison included in the meta-analysis is single- vs 2-implant MODs. Pooled data revealed that single-implant MODs significantly decreased the MBL (mean difference: 0.27, 95% confidence interval: 0.20-0.34, P failures (risk ratio: 3.26, 95% confidence interval: 1.18-8.97), P = .02; I(2) = 0%). Single-implant MOD was found to be better than 2-implant MOD in terms of MBL and number of implant failures. However, this result should be interpreted with caution due to limited number of analyzed studies with different loading protocols and short follow-up period. Copyright © 2017 Elsevier Inc. All rights reserved.

  16. Hydroxyapatite-coated uncemented implants and peri-implant infection

    OpenAIRE

    Oosterbos, Cornelis Johannes Maria

    2004-01-01

    One of the major complications of joint replacement surgery is a peri-implant infection. A hip prosthesis coated with hydroxyapatite, a calcium phosphate (found in human bone), may offer protection in this respect. In a series of patients who were treated with a hydroxyapatite-coated hip prosthesis for their osteoarthritis, excellent clinical performance and radiographic appearance were found after 5 and 10 years. Radiographically there were signs of osseointegration of the proximal part of t...

  17. Successful Rehabilitation of Partial Edentulous Maxilla and Mandible with New Type of Implants: Molecular Precision Implants

    Directory of Open Access Journals (Sweden)

    Matteo Danza

    2014-01-01

    Full Text Available The extraction of teeth results in rapid bone resorption both vertically and horizontally in the first month. The loss of alveolar ridge reduces the chance of implant rehabilitation. Atraumatic extraction, implant placement in extraction socket, and an immediate prosthesis have been proposed as alternative therapies to maintain the volume and contours tissue and reduce time and cost of treatment. The immediate load of implants is a universally practiced procedure; nevertheless a successful procedure requires expertise in both the clinical and the reconstructive stages using a solid implant system. Excellent primary stability and high bone-implant contact are only minimal requirements for any type of implant procedure. In this paper we present a case report using a new type of implants. The new type of implants, due to its sophisticated control system of production, provides to the implantologist a safe and reliable implant, with a macromorphology designed to ensure a close contact with the surrounding bone.

  18. Successful rehabilitation of partial edentulous maxilla and mandible with new type of implants: molecular precision implants.

    Science.gov (United States)

    Danza, Matteo; Lauritano, Dorina; Carinci, Francesco

    2014-01-01

    The extraction of teeth results in rapid bone resorption both vertically and horizontally in the first month. The loss of alveolar ridge reduces the chance of implant rehabilitation. Atraumatic extraction, implant placement in extraction socket, and an immediate prosthesis have been proposed as alternative therapies to maintain the volume and contours tissue and reduce time and cost of treatment. The immediate load of implants is a universally practiced procedure; nevertheless a successful procedure requires expertise in both the clinical and the reconstructive stages using a solid implant system. Excellent primary stability and high bone-implant contact are only minimal requirements for any type of implant procedure. In this paper we present a case report using a new type of implants. The new type of implants, due to its sophisticated control system of production, provides to the implantologist a safe and reliable implant, with a macromorphology designed to ensure a close contact with the surrounding bone.

  19. Prevalence of peri-implant disease on platform switching implants: a cross-sectional pilot study

    Directory of Open Access Journals (Sweden)

    Andrés Duque DUQUE

    2016-01-01

    Full Text Available The objective of this study was to assess the prevalence of mucositis and peri-implantitis associated with the use of two types of implants—conventional versus platform switching after one year of loading. A longitudinal study of 64 implants in 25 patients was performed. Clinical variables, such as clinical pocket depth and bleeding upon probing, plaque, mobility, gingival recession, clinical attachment loss, and radiographic bone loss, were analyzed. The case definition for peri-implantitis was established as pockets of ≥ 5 mm with bleeding and bone loss ≥ 2 mm. One year after implant loading, the prevalence of mucositis and peri-implantitis with conventional implants (CIs was 81.2% and 15.6%, respectively. For platform switching implants (PSIs the prevalence was 90% and 6.6%, respectively. These differences were not statistically significant (p = 0.5375. However, there was a trend towards a lower prevalence of peri-implantitis with platform switching Implants.

  20. Hydroxyapatite ocular implant and non-integrated implants in eviscerated patients

    Science.gov (United States)

    Gradinaru, S; Popescu, V; Leasu, C; Pricopie, S; Yasin, S; Ciuluvica, R; Ungureanu, E

    2015-01-01

    Introduction: This study compares the outcomes and complications of hydroxyapatite ocular implant and non-integrated ocular implants following evisceration. Materials and Methods: This is a retrospective study of 90 patients who underwent evisceration for different ocular affections, in the Ophthalmology Department of the University Emergency Hospital Bucharest, between January 2009 and December 2013. The outcomes measured were conjunctival dehiscence, socket infection, implant exposure and extrusion rate. Results: Forty-three patients had the hydroxyapatite implant (coralline–Integrated Ocular Implants, USA or synthetic–FCI, France) and forty-seven received non-integrated ocular implants (24 acrylic and 23 silicone). Five cases of socket infection, thirteen cases of extrusion and two cases of conjunctival dehiscence were encountered. Conclusions: There was a higher rate of conjunctival dehiscence with hydroxyapatite ocular implant, but implant extrusion and socket infection were found in non-integrated ocular implants. PMID:25914747

  1. Does the number of implants have any relation with peri-implant disease?

    Directory of Open Access Journals (Sweden)

    Bernardo Born PASSONI

    2014-10-01

    Full Text Available Objective: The aim of this study was to evaluate the relationship between the number of pillar implants of implant-supported fixed prostheses and the prevalence of periimplant disease. Material and Methods: Clinical and radiographic data were obtained for the evaluation. The sample consisted of 32 patients with implant-supported fixed prostheses in function for at least one year. A total of 161 implants were evaluated. Two groups were formed according to the number of implants: G1 ≤5 implants and G2 >5 implants. Data collection included modified plaque index (MPi, bleeding on probing (BOP, probing depth (PD, width of keratinized mucosa (KM and radiographic bone loss (BL. Clinical and radiographic data were grouped for each implant in order to conduct the diagnosis of mucositis or peri-implantitis. Results: Clinical parameters were compared between groups using Student’s t test for numeric variables (KM, PD and BL and Mann-Whitney test for categorical variables (MPi and BOP. KM and BL showed statistically significant differences between both groups (p<0.001. Implants from G1 – 19 (20.43% – compared with G2 – 26 (38.24% – showed statistically significant differences regarding the prevalence of peri-implantitis (p=0.0210. Conclusion: It seems that more than 5 implants in total fixed rehabilitations increase bone loss and consequently the prevalence of implants with periimplantitis. Notwithstanding, the number of implants does not have any influence on the prevalence of mucositis.

  2. Flapless dental implant surgery: a retrospective study of 1,241 consecutive implants.

    Science.gov (United States)

    Doan, Nghiem Van Trong; Du, Zhibin; Reher, Peter; Xiao, Yin

    2014-01-01

    The purpose of this study was to identify retrospectively the predictors of implant survival when the flapless protocol was used in two private dental practices. The collected data were initially computer searched to identify the patients; later, a hand search of patient records was carried out to identify all flapless implants consecutively inserted over the last 10 years. The demographic information gathered on statistical predictors included age, sex, periodontal and peri-implantitis status, smoking, details of implants inserted, implant locations, placement time after extraction, use of simultaneous guided hard and soft tissue regeneration procedures, loading protocols, type of prosthesis, and treatment outcomes (implant survival and complications). Excluded were any implants that required flaps or simultaneous guided hard and soft tissue regeneration procedures, and implants narrower than 3.25 mm. A total of 1,241 implants had been placed in 472 patients. Life table analysis indicated cumulative 5-year and 10-year implant survival rates of 97.9% and 96.5%, respectively. Most of the failed implants occurred in the posterior maxilla (54%) in type 4 bone (74.0%), and 55.0% of failed implants had been placed in smokers. Flapless dental implant surgery can yield an implant survival rate comparable to that reported in other studies using traditional flap techniques.

  3. [Implantation of the artificial retina].

    Science.gov (United States)

    Yagi, T; Hayashida, Y

    1999-05-01

    In some degenerative retinal diseases, e.g., retinitis pigmentosa and age-related macular degeneration, the photoreceptors are destroyed to cause serious visual defects. Recent studies on blind human subjects revealed that a large number of ganglion cells remains intact and is capable of transmitting signals to the brain to evoke partial visual perception. This provided hope to compensate for the visual defects with retinal prostheses. The recent progress of microfabrication technique made it possible to implement the Vary Large Scale Integrated circuit, the artificial retina, which emulates a part of retinal function. The idea of implanting the artificial retina to the patients was proposed recently and experiments using animals have been put into practice. This article surveys the front line of the artificial retina implantation.

  4. Implante imediato com carga imediata

    OpenAIRE

    Fontoura, Ricardo Cauterucci

    2016-01-01

    Dois estágios cirúrgicos, somados a um período de cicatrização de três a seis meses, com a ausência de cargas funcionais foram estabelecidos por Bränemark, em 1977, como protocolo cirúrgico da terapia com implantes osteointegrados. Somente após esse tempo de cicatrização, poderia ocorrer a activação dos implantes e confecção das próteses. O desenvolvimento de vários estudos, com a finalidade de abreviar esse período de cicatrização, a simplificação da terapia restauradora, somados aos avan...

  5. Appropriate uptake period for myocardial PET imaging with {sup 18}F-FDG after oral glucose loading; Optimaler Akquisitionszeitpunkt fuer die Herz-PET mit {sup 18}F-FDG nach oraler Glukosebelastung

    Energy Technology Data Exchange (ETDEWEB)

    Brink, I.; Hentschell, M.; Hoegerle, S.; Moser, E. [Abt. Nuklearmedizin, Radiologische, Universitaetsklinik Freiburg (Germany); Nitzsche, E.U. [Abt. Nuklearmedizin und PET, Universitaetsklink Basel (Switzerland); Mix, M.; Schindler, T. [Div. of Nuclear Medicine and Biophysics, UCLA School of Medicine, Los Angeles, CA (United States)

    2003-02-01

    Akquisitionszeitpunkts fuer die myokardiale Vitalitaetsdiagnostik mittels statischer {sup 18}F-FDG-PET bei Patienten mit und ohne Diabetes mellitus nach oraler Glukoseapplikation. Methodik: Statische PET-Aufnahmen wurden bei 27 Patienten mit koronarer Mehrgefaesserkrankung und anamnestisch dokumentiertem Myokardinfarkt nach 4-stuendiger Nahrungskarenz zu unten genannten Zeitpunkten nach Injektion von 330 {+-} 20 MBq FDG akquiriert. Die Bildbewertung erfolgte semiquantitativ nach ROI-Analyse durch Bestimmung des Aktivitaetsverhaeltnisses zwischen Myokard und Blutpool (M/B). I.) Scans 30 min, 60 min und 90 min p. i. bei zehn stoffwechselgesunden Patienten (60 g Glukose oral, 1 h vor FDG-Injektion, Insulin nach Bedarf); II.) Scans 30 min, 60 min und 90 min p. i. bei zehn Patienten mit KHK und nicht insulinpflichtigem Diabetes mellitus (20 g Glukose oral, 1 h vor FDG-Injektion, Insulintriggerung); III.) Scans 90 min p. i. bei sieben Patienten mit KHK und nicht insulinpflichtigem Diabetes mellitus mit Nuechtern-Blutzuckerkonzentration zwischen 140 und 200 mg/dl (nur Insulin, keine Glukose). Ergebnisse: I.) Der Quotient M/B erhoeht sich signifikant bei Stoffwechselgesunden mit Verlaengerung der Uptake-Zeit (30 min 1,95 {+-} 0,20; 60 min 2,96 {+-} 0,36; 90 min 3,78 {+-} 0,43). II.) Nicht insulinpflichtige Diabetiker weisen ein deutlich geringeres M/B-Verhaeltnis auf, das jedoch ebenfalls mit der Uptake-Zeit signifikant steigt (30 min 1,56 {+-} 0,10; 60 min 2,15 {+-} 0,14; 90 min 2,71 {+-} 0,19). III.) Auch bei erhoehter Nuechtern-Blutzuckerkonzentration ergab eine kombinierte Glukose/Insulingabe gegenueber alleiniger Insulinapplikation 90 min p. i. eine hoehere Bildqualitaet (M/B 2,71 {+-} 0,19 versus 2,16 {+-} 0,07). Schlussfolgerung: Die Uptake-Zeit von 90 min fuehrt gegenueber kuerzeren Intervallen bei stoffwechselgesunden Patienten und Patienten mit nicht insulinpflichtigem Diabetes mellitus zu verbesserter Bildqualitaet. (orig.)

  6. New biomaterials for orthopedic implants

    OpenAIRE

    Ong KL; Yun BM; White JB

    2015-01-01

    Kevin L Ong, Brian Min Yun, Joshua B WhiteExponent, Inc., Philadelphia, PA, USAAbstract: With the increasing use of orthopedic implants worldwide, there continues to be great interest in the development of novel technologies to further improve the effective clinical performance of contemporary treatment modalities and devices. Continuing research interest also exists in developing novel bulk biomaterials (eg, polycarbonate urethanes, silicon) or novel formulations of existing but less widely ...

  7. Totale antioxidative Kapazität bei am Herzen operierten Kindern

    OpenAIRE

    Sokalska, Magdalena

    2003-01-01

    Oxidative stress results from the release of oxygen free radicals. The best known mechanisms which lead to the oxidative stress are ischemia- reperfusion injury and activation of neutrophile. Oxidative stress is one of the most important factors which induce inflammatory complications and tissue damage after CPB. There are an enzymatic and non-enzymatic defence mechanism against reactive oxygen free radicals which together create a total anti-oxidant capacity. Oxidative stress during operatio...

  8. Fractionated magnetic-resonance elastography on the human heart; Fraktionierte Magnetresonanzelastographie am menschlichen Herzen

    Energy Technology Data Exchange (ETDEWEB)

    Rump, Jens

    2008-07-28

    Imaging techniques, including magnetic resonance imaging, belong to the most important tools in modern medical diagnostics. Another diagnostic aid is palpation, which is suitable for the qualitative characterization of pathological changes in organs near the surface. Magnetic resonance elastography (MRE) is a combination of these techniques. In principle, MRE uses motionsensitive MR-imaging to depict tissue deformation caused by externally induced shear waves. The type of deformation supply useful information about the elasticity of the tissue. Cardiac disorders are among the most common diseases. The goal of this study was to develop a method of applying in-vivo MRE to the human heart. The development of the mechanical stimulus, ultimately resulting in the introduction of an audio speaker as the source of vibration, provided the necessary means to introduce vibrations into inner organs. A crucial factor in applying MRE to the heart is the speed of the recording, which led to the development of 'fractional MRE'. The currently conventional fast heart imaging techniques were used as a starting point. The use of an unbalanced phase preparation gradient in the balanced steady-state imaging technique resulted in an improved phase-to-noise ratio. Along with the spoiled steady-state MRE imaging technique, initial MRE-studies on the human heart were performed. For the first time, externally induced mechanical vibrations were successfully introduced into the heart and were detected using fractional MRE with a high temporal resolution. The modulation of the shear wave amplitudes observed in the myocard of 6 healthy subjects correlated with the phases of the cardiac cycle. The techniques and methods developed here are a step toward routine clinical application of MRE of the heart and indicate high potential in the area of early diagnosis of cardiac disease. (orig.)

  9. Miniscrew implant applications in contemporary orthodontics

    Directory of Open Access Journals (Sweden)

    Hong-Po Chang

    2014-03-01

    Full Text Available The need for orthodontic treatment modalities that provide maximal anchorage control but with minimal patient compliance requirements has led to the development of implant-assisted orthodontics and dentofacial orthopedics. Skeletal anchorage with miniscrew implants has no patient compliance requirements and has been widely incorporated in orthodontic practice. Miniscrew implants are now routinely used as anchorage devices in orthodontic treatment. This review summarizes recent data regarding the interpretation of bone data (i.e., bone quantity and quality obtained by preoperative diagnostic computed tomography (CT or by cone-beam computed tomography (CBCT prior to miniscrew implant placement. Such data are essential when selecting appropriate sites for miniscrew implant placement. Bone characteristics that are indications and contraindications for treatment with miniscrew implants are discussed. Additionally, bicortical orthodontic skeletal anchorage, risks associated with miniscrew implant failure, and miniscrew implants for nonsurgical correction of occlusal cant or vertical excess are reviewed. Finally, implant stability is compared between titanium alloy and stainless steel miniscrew implants.

  10. Congenitally deaf children following cochlear implantation.

    Science.gov (United States)

    O'Donoghue, G M; Nikolopoulos, T; Archbold, S M; Tait, M

    1998-01-01

    The aim of this study is to determine the auditory performance of congenitally deaf children following cochlear implantation. A prospective study is undertaken of 71 such children who have been implanted in a dedicated paediatric cochlear implant centre and who have been followed up to 3 years following implantation. All children are aged less than 8 years at the time of implantation and all receive a multichannel cochlear implant system. No child meeting these criteria has been excluded from the study. The average age at implantation is 56.5 months (range 27 to 93 months, standard deviation 15.9 months). Auditory performance is assessed by using the Categories of Auditory Perception (CAP) scale which is developed primarily as a clinical tool for evaluating profoundly deaf young children following cochlear implantation. The median score prior to implantation on this scale is Category 0 (no awareness of environmental sound), at the 1 year interval is Category 4 (discrimination some speech sounds without lip-reading), and at the 2 and 3 year interval, the median score on the CAP scale is Category 5 (understanding of common phrases without lip-reading). These results indicate the ability of cochlear implants to provide significant auditory receptive skills to young congenitally deaf children.

  11. Simvastatin Reduces Capsular Fibrosis around Silicone Implants.

    Science.gov (United States)

    Chung, Kyu Jin; Park, Ki Rin; Lee, Jun Ho; Kim, Tae Gon; Kim, Yong-Ha

    2016-08-01

    Capsular fibrosis and contracture occurs in most breast reconstruction patients who undergo radiotherapy, and there is no definitive solution for its prevention. Simvastatin was effective at reducing fibrosis in various models. Peri-implant capsular formation is the result of tissue fibrosis development in irradiated breasts. The purpose of this study was to examine the effect of simvastatin on peri-implant fibrosis in rats. Eighteen male Sprague-Dawley rats were allocated to an experimental group (9 rats, 18 implants) or a control group (9 rats, 18 implants). Two hemispherical silicone implants, 10 mm in diameter, were inserted in subpanniculus pockets in each rat. The next day, 10-Gy of radiation from a clinical accelerator was targeted at the implants. Simvastatin (15 mg/kg/day) was administered by oral gavage in the experimental group, while animals in the control group received water. At 12 weeks post-implantation, peri-implant capsules were harvested and examined histologically and by real-time polymerase chain reaction. The average capsular thickness was 371.2 μm in the simvastatin group and 491.2 μm in the control group. The fibrosis ratio was significantly different, with 32.33% in the simvastatin group and 58.44% in the control group (P simvastatin group compared to the control group (P simvastatin reduces radiation-induced capsular fibrosis around silicone implants in rats. This finding offers an alternative therapeutic strategy for reducing capsular fibrosis and contracture after implant-based breast reconstruction.

  12. Management of peri-implant infections

    Directory of Open Access Journals (Sweden)

    K L Vandana

    2015-01-01

    Full Text Available The ever-increasing popularity of dental implants in recent years has been associated with the reported incidence of short-term and long-term complications such as peri-implant mucositis and peri-implantitis. Therapies proposed for treating peri-implantitis are based on the evidence available for the treatment of periodontitis, and are aimed at reducing the bacterial load within peri-implant pockets and decontaminating implant surfaces, and, in some cases, attempting afterward to bring about bone regeneration. The treatment of peri-implant infections comprises conservative (nonsurgical and surgical approaches. This paper reviews various treatment strategies used for the treatment of peri-implant diseases. There are many approaches suggested by various authors for the treatment of peri-implant diseases, but there is no “ideal peri-implant therapy” that has been described in the literature. There is no consensus regarding the treatment protocol as the studies conducted so far have had varying study designs, small sample sizes, and short follow-up periods.

  13. Primary Oral Malignancy Imitating Peri-Implantitis.

    Science.gov (United States)

    Raiser, Vadim; Abu-El Naaj, Immad; Shlomi, Benjamin; Fliss, Dan M; Kaplan, Ilana

    2016-07-01

    To describe new cases of primary malignancy arising around dental implants. Three patients presented with asymptomatic lesions around longstanding dental implants that resembled peri-implantitis. One case was primary large B-cell lymphoma and the remaining cases were primary squamous cell carcinoma in patients with oral lichen planus. The literature was reviewed for cases mimicking peri-implantitis. Of 42 implant-associated malignancies reported from 2000 through 2014, 85.7% were squamous cell carcinoma (69% primary and 9.4% metastatic). Most patients presented with pre-existing risk factors for oral cancer. Lymphoma was not associated with dental implants. Primary and metastatic malignancies can occur in peri-implant mucosa, often with clinical and radiographic features resembling peri-implantitis. Clinicians should have a high index of suspicion for changes in peri-implant mucosa in patients with existing risk factors; however, rare cases such as lymphoma might present outside this risk population. Histopathologic analysis should be included in the management of selected peri-implant lesions to avoid delayed diagnosis of malignancy. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  14. Computerized implant-dentistry: Advances toward automation

    Directory of Open Access Journals (Sweden)

    Minkle Gulati

    2015-01-01

    Full Text Available Advancements in the field of implantology such as three-dimensional imaging, implant-planning software, computer-aided-design/computer-aided-manufacturing (CAD/CAM technology, computer-guided, and navigated implant surgery have led to the computerization of implant-dentistry. This three-dimensional computer-generated implant-planning and surgery has not only enabled accurate preoperative evaluation of the anatomic limitations but has also facilitated preoperative planning of implant positions along with virtual implant placement and subsequently transferring the virtual treatment plans onto the surgical phase via static (guided or dynamic (navigated systems aided by CAD/CAM technology. Computerized-implant-dentistry being highly predictable and minimally invasive in nature has also allowed implant placement in patients with medical comorbidities (e.g. radiation therapy, blood dyscrasias, in patients with complex problems following a significant alteration of the bony anatomy as a result of benign or malignant pathology of the jaws or trauma and in patients with other physical and emotional problems. With significant achievements accomplished in the field of computerized implant-dentistry, attempts are now been made toward complete automation of implant-dentistry.

  15. Computerized implant-dentistry: Advances toward automation.

    Science.gov (United States)

    Gulati, Minkle; Anand, Vishal; Salaria, Sanjeev Kumar; Jain, Nikil; Gupta, Shilpi

    2015-01-01

    Advancements in the field of implantology such as three-dimensional imaging, implant-planning software, computer-aided-design/computer-aided-manufacturing (CAD/CAM) technology, computer-guided, and navigated implant surgery have led to the computerization of implant-dentistry. This three-dimensional computer-generated implant-planning and surgery has not only enabled accurate preoperative evaluation of the anatomic limitations but has also facilitated preoperative planning of implant positions along with virtual implant placement and subsequently transferring the virtual treatment plans onto the surgical phase via static (guided) or dynamic (navigated) systems aided by CAD/CAM technology. Computerized-implant-dentistry being highly predictable and minimally invasive in nature has also allowed implant placement in patients with medical comorbidities (e.g. radiation therapy, blood dyscrasias), in patients with complex problems following a significant alteration of the bony anatomy as a result of benign or malignant pathology of the jaws or trauma and in patients with other physical and emotional problems. With significant achievements accomplished in the field of computerized implant-dentistry, attempts are now been made toward complete automation of implant-dentistry.

  16. Miniscrew implant applications in contemporary orthodontics.

    Science.gov (United States)

    Chang, Hong-Po; Tseng, Yu-Chuan

    2014-03-01

    The need for orthodontic treatment modalities that provide maximal anchorage control but with minimal patient compliance requirements has led to the development of implant-assisted orthodontics and dentofacial orthopedics. Skeletal anchorage with miniscrew implants has no patient compliance requirements and has been widely incorporated in orthodontic practice. Miniscrew implants are now routinely used as anchorage devices in orthodontic treatment. This review summarizes recent data regarding the interpretation of bone data (i.e., bone quantity and quality) obtained by preoperative diagnostic computed tomography (CT) or by cone-beam computed tomography (CBCT) prior to miniscrew implant placement. Such data are essential when selecting appropriate sites for miniscrew implant placement. Bone characteristics that are indications and contraindications for treatment with miniscrew implants are discussed. Additionally, bicortical orthodontic skeletal anchorage, risks associated with miniscrew implant failure, and miniscrew implants for nonsurgical correction of occlusal cant or vertical excess are reviewed. Finally, implant stability is compared between titanium alloy and stainless steel miniscrew implants. Copyright © 2013. Published by Elsevier B.V.

  17. Cochlear implants: system design, integration, and evaluation.

    Science.gov (United States)

    Zeng, Fan-Gang; Rebscher, Stephen; Harrison, William; Sun, Xiaoan; Feng, Haihong

    2008-01-01

    As the most successful neural prosthesis, cochlear implants have provided partial hearing to more than 120000 persons worldwide; half of which being pediatric users who are able to develop nearly normal language. Biomedical engineers have played a central role in the design, integration and evaluation of the cochlear implant system, but the overall success is a result of collaborative work with physiologists, psychologists, physicians, educators, and entrepreneurs. This review presents broad yet in-depth academic and industrial perspectives on the underlying research and ongoing development of cochlear implants. The introduction accounts for major events and advances in cochlear implants, including dynamic interplays among engineers, scientists, physicians, and policy makers. The review takes a system approach to address critical issues in cochlear implant research and development. First, the cochlear implant system design and specifications are laid out. Second, the design goals, principles, and methods of the subsystem components are identified from the external speech processor and radio frequency transmission link to the internal receiver, stimulator and electrode arrays. Third, system integration and functional evaluation are presented with respect to safety, reliability, and challenges facing the present and future cochlear implant designers and users. Finally, issues beyond cochlear implants are discussed to address treatment options for the entire spectrum of hearing impairment as well as to use the cochlear implant as a model to design and evaluate other similar neural prostheses such as vestibular and retinal implants.

  18. Ultrasonic evaluation of dental implant osseointegration.

    Science.gov (United States)

    Vayron, Romain; Soffer, Emmanuel; Anagnostou, Fani; Haïat, Guillaume

    2014-11-07

    Dental implants are widely used for oral rehabilitation. However, there remain risks of failure which are difficult to anticipate and depend on the implant osseointegration. The objective of this in vivo study is to determine the variation of the echographic ultrasonic response of a dental implant to bone healing around the implant interface. Twenty one dental implants were inserted in the femur of seven New Zealand white rabbits. Two animals were sacrificed after a healing duration of two weeks, three animals after six weeks and six animals after eleven weeks. The 10 MHz ultrasonic response of the implant was measured just after the implantation using a dedicated device positioned at the emerging surface of each dental implant. The measurements were realized again before the sacrifice with the same device. An indicator I˜ was derived based on the amplitude of the rf signal obtained for each configuration. The bone-Implant Contact (BIC) ratio was determined by histological analyses. The average value of the relative variation of the indicator I˜ obtained after initial surgery and after the corresponding healing period varies between 7% and 40%. A Kruskal-Wallis test (pdental implant varies significantly as a function of healing time, which paves the way for the development of a new quantitative ultrasound (QUS) method in oral implantology. Copyright © 2014 Elsevier Ltd. All rights reserved.

  19. R&D on dental implants breakage

    Science.gov (United States)

    Croitoru, Sorin Mihai; Popovici, Ion Alexandru

    2017-09-01

    Most used dental implants for human dental prostheses are of two steps type: first step means implantation and, after several months healing and osseointegration, second step is prosthesis fixture. For sure, dental implants and prostheses are meant to last for a lifetime. Still, there are unfortunate cases when dental implants break. This paper studies two steps dental implants breakage and proposes a set of instruments for replacement and restoration of the broken implant. First part of the paper sets the input data of the study: structure of the studied two steps dental implants based on two Romanian patents and values of the loading forces found in practice and specialty papers. In the second part of the paper, using DEFORM 2D™ FEM simulation software, worst case scenarios of loading dental implants are studied in order to determine which zones and components of the dental implant set are affected (broken). Last part of the paper is dedicated to design and presentation of a set for extracting and cutting tools used to restore the broken implant set.

  20. Ankylos implant system: concept and clinical application.

    Science.gov (United States)

    Nentwig, Georg H

    2004-01-01

    The Ankylos system was developed in 1985 and has been in clinical use since 1987. Some of its significant design features include (1) a progressive thread structure of the endosseous implant body for targeted load distribution to the apically positioned spongy bone; and (2) the gap-free subgingival tapered connection to the abutments. The purpose of this report is to demonstrate that the Ankylos Implant System meets both the patients' and the dentists' standards of success and is suitable for use as single tooth replacements, bridge abutments, and retention elements for all regions and prosthetic indications. The data from 5439 implants were evaluated between October 1991 and October 2002. The implants were considered successful if the following criteria were met: (1) clinical stability and function; (2) no inflammation of the peri-implant hard and soft tissue; (3) no progressive loss of the peri-implant bone; (4) no progressive loss of the peri-implant mucosa; and (5) satisfaction of the patient. All implants placed during this period were included in the evaluation as a prospective study. The average loading period was 56.8 months. Postoperative follow-ups were made once a year by a standardized protocol. The results were classified by prosthetic application in Table 1. A total of 943 implants were placed as single tooth restoration and were followed for the duration of the study. The success rate for this type of restoration was 98.7%. For free-end implant restorations, there were 1679 implants placed with a 97.9% success rate. When the edentulous area involved a large gap, a total of 805 implants were placed with a 97.3% success rate. For cases involving reduced dentition, 606 implants were used with a 95.8% success rate. Another significant finding was that the success rates classified by maxilla and mandible showed no differences.

  1. Additively manufactured porous tantalum implants.

    Science.gov (United States)

    Wauthle, Ruben; van der Stok, Johan; Amin Yavari, Saber; Van Humbeeck, Jan; Kruth, Jean-Pierre; Zadpoor, Amir Abbas; Weinans, Harrie; Mulier, Michiel; Schrooten, Jan

    2015-03-01

    The medical device industry's interest in open porous, metallic biomaterials has increased in response to additive manufacturing techniques enabling the production of complex shapes that cannot be produced with conventional techniques. Tantalum is an important metal for medical devices because of its good biocompatibility. In this study selective laser melting technology was used for the first time to manufacture highly porous pure tantalum implants with fully interconnected open pores. The architecture of the porous structure in combination with the material properties of tantalum result in mechanical properties close to those of human bone and allow for bone ingrowth. The bone regeneration performance of the porous tantalum was evaluated in vivo using an orthotopic load-bearing bone defect model in the rat femur. After 12 weeks, substantial bone ingrowth, good quality of the regenerated bone and a strong, functional implant-bone interface connection were observed. Compared to identical porous Ti-6Al-4V structures, laser-melted tantalum shows excellent osteoconductive properties, has a higher normalized fatigue strength and allows for more plastic deformation due to its high ductility. It is therefore concluded that this is a first step towards a new generation of open porous tantalum implants manufactured using selective laser melting. Copyright © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  2. Remote programming of cochlear implants.

    Science.gov (United States)

    Samuel, Paola Angelica; Goffi-Gomez, Maria Valéria Schmidt; Bittencourt, Aline Gomes; Tsuji, Robinson Koji; Brito, Rubens de

    2014-01-01

    To verify the effectiveness of remote programming of cochlear implants by stimulation levels and results in the perception of speech and free-field audiometry tests. Twelve patients from both genders, aged between 18 and 59 years, users of internal cochlear implant and speech processor of the same model for at least 12 months, were selected. Both the remote programming (RP) and the live programming (LP) were performed on the same day, measuring the minimum (T) and maximum (C) stimulation levels of five electrodes with the interpolation of the remaining ones. Speech perception tests were applied using 65 dBSPL (recorded open context sentences and monosyllables). The patients were submitted to free-field audiometry at 250-8,000 Hz frequencies. The results for the RP and LP were compared. Differences in mean of the T levels for three electrodes and the C levels for one electrode were found. No difference between the results was obtained in the speech perception tests and audiometric thresholds in the RP and LP. The RP is a simple and effective procedure for programming cochlear implant devices and, although there were differences in the stimulation levels of some electrodes, it did not interfere in the speech perception outcomes.

  3. Cortical Plasticity after Cochlear Implantation

    Directory of Open Access Journals (Sweden)

    B. Petersen

    2013-01-01

    tomography at three time points: within 14 days, three months, and six months after switch-on. Fifteen recently implanted adult implant recipients listened to running speech or speech-like noise in four sequential PET sessions at each milestone. CI listeners with postlingual hearing loss showed differential activation of left superior temporal gyrus during speech and speech-like stimuli, unlike CI listeners with prelingual hearing loss. Furthermore, Broca’s area was activated as an effect of time, but only in CI listeners with postlingual hearing loss. The study demonstrates that adaptation to the cochlear implant is highly related to the history of hearing loss. Speech processing in patients whose hearing loss occurred after the acquisition of language involves brain areas associated with speech comprehension, which is not the case for patients whose hearing loss occurred before the acquisition of language. Finally, the findings confirm the key role of Broca’s area in restoration of speech perception, but only in individuals in whom Broca’s area has been active prior to the loss of hearing.

  4. Survival of dental implants placed in sites of previously failed implants.

    Science.gov (United States)

    Chrcanovic, Bruno R; Kisch, Jenö; Albrektsson, Tomas; Wennerberg, Ann

    2017-11-01

    To assess the survival of dental implants placed in sites of previously failed implants and to explore the possible factors that might affect the outcome of this reimplantation procedure. Patients that had failed dental implants, which were replaced with the same implant type at the same site, were included. Descriptive statistics were used to describe the patients and implants; survival analysis was also performed. The effect of systemic, environmental, and local factors on the survival of the reoperated implants was evaluated. 175 of 10,096 implants in 98 patients were replaced by another implant at the same location (159, 14, and 2 implants at second, third, and fourth surgeries, respectively). Newly replaced implants were generally of similar diameter but of shorter length compared to the previously placed fixtures. A statistically significant greater percentage of lost implants were placed in sites with low bone quantity. There was a statistically significant difference (P = 0.032) in the survival rates between implants that were inserted for the first time (94%) and implants that replaced the ones lost (73%). There was a statistically higher failure rate of the reoperated implants for patients taking antidepressants and antithrombotic agents. Dental implants replacing failed implants had lower survival rates than the rates reported for the previous attempts of implant placement. It is suggested that a site-specific negative effect may possibly be associated with this phenomenon, as well as the intake of antidepressants and antithrombotic agents. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  5. Influence of different implant materials on the primary stability of orthodontic mini-implants

    Directory of Open Access Journals (Sweden)

    Chin-Yun Pan

    2012-12-01

    Full Text Available This study evaluates the influence of different implant materials on the primary stability of orthodontic mini-implants by measuring the resonance frequency. Twenty-five orthodontic mini-implants with a diameter of 2 mm were used. The first group contained stainless steel mini-implants with two different lengths (10 and 12 mm. The second group included titanium alloy mini-implants with two different lengths (10 and 12 mm and stainless steel mini-implants 10 mm in length. The mini-implants were inserted into artificial bones with a 2-mm-thick cortical layer and 40 or 20 lb/ft3 trabecular bone density at insertion depths of 2, 4, and 6 mm. The resonance frequency of the mini-implants in the artificial bone was detected with the Implomates® device. Data were analyzed by two-way analysis of variance followed by the Tukey honestly significant difference test (α = 0.05. Greater insertion depth resulted in higher resonance frequency, whereas longer mini-implants showed lower resonance frequency values. However, resonance frequency was not influenced by the implant materials titanium alloy or stainless steel. Therefore, the primary stability of a mini-implant is influenced by insertion depth and not by implant material. Insertion depth is extremely important for primary implant stability and is critical for treatment success.

  6. Medication-Related Osteonecrosis of the Jaw Around Dental Implants: Implant Surgery-Triggered or Implant Presence-Triggered Osteonecrosis?

    Science.gov (United States)

    Giovannacci, Ilaria; Meleti, Marco; Manfredi, Maddalena; Mortellaro, Carmen; Greco Lucchina, Alberta; Bonanini, Mauro; Vescovi, Paolo

    2016-05-01

    Dentoalveolar surgery including tooth extractions and dental implants placement is considered the major risk factor for developing medication-related osteonecrosis of the jaw (MRONJ).In this study, a patient series of MRONJ around dental implants were carefully analyzed to describe the findings and to assess the possible risk factors. Fifteen patients with peri-implant bone osteonecrosis were selected out of a group of 250 patients (6%). Patients were divided into 2 groups according to the temporal relationship. Group 1 (G1)-necrosis immediately after implant placement (from 2 to 10 months) and defined as "implant surgery-triggered" MRONJ. Group 2-necrosis distant (from 1 to 15 years) from implant placement and defined as "implant presence-triggered" MRONJ. Epidemiological and pharmacological variables were recorded as well as specific data about osteonecrosis and dental implants. G1 included 6 patients: 5 (83.4%) treated with oral bisphosphonates (BPs) for osteoporosis and 1 (16.6%) with intravenous BPs for breast cancer. Mean duration of BP therapy (BPT) was 83.7 months. G2 included 9 patients: 8 patients (88.89%) treated with intravenous BPs for malignant disease and 1 (11.11%) with oral BPs for osteoporosis. Data confirms that not only surgical insertion of dental implants is a potential risk factor for the development of osteonecrosis but also the presence itself of the implant into the bone can be associated with this disease. Therefore, it is necessary to inform of the increased risk for MRONJ also the patients who have already osteointegrated implants and are going to start the BPT.The risk is lower for patients receiving oral BPs but it exists and seems to be higher if the implant is located in the posterior areas, if the duration of BPT is more than 3 years and if the patient is under corticosteroid therapy.

  7. Impact of crestal and subcrestal implant placement in peri-implant bone: A prospective comparative study.

    Science.gov (United States)

    Pellicer-Chover, Hilario; Peñarrocha-Diago, María; Peñarrocha-Oltra, David; Gomar-Vercher, Sonia; Agustín-Panadero, Rubén; Peñarrocha-Diago, Miguel

    2016-01-01

    To assess the influence of the crestal or subcrestal placement of implants upon peri-implant bone loss over 12 months of follow-up. Twenty-six patients with a single hopeless tooth were recruited in the Oral Surgery Unit (Valencia University, Valencia, Spain). The patients were randomized into two treatment groups: group A (implants placed at crestal level) or group B (implants placed at subcrestal level). Control visits were conducted by a trained clinician at the time of implant placement and 12 months after loading. A previously established standard protocol was used to compile general data on all patients (sex and age, implant length and diameter, and brushing frequency). Implant success rate, peri-implant bone loss and the treatment of the exposed implant surface were studied. The level of statistical significance was defined as 5% (α=0.05). Twenty-three patients (8 males and 15 females, mean age 49.8±11.6 years, range 28-75 years) were included in the final data analyses, while three were excluded. All the included subjects were non-smokers with a brushing frequency of up to twice a day in 85.7% of the cases. The 23 implants comprised 10 crestal implants and 13 subcrestal implants. After implant placement, the mean bone position with respect to the implant platform in group A was 0.0 mm versus 2.16±0.88 mm in group B. After 12 months of follow-up, the mean bone positions were -0.06±1.11 mm and 0.95±1.50 mm, respectively - this representing a bone loss of 0.06±1.11 mm in the case of the crestal implants and of 1.22±1.06 mm in the case of the subcrestal implants (p=0.014). Four crestal implants and 5 subcrestal implants presented peri-implant bone levels below the platform, leaving a mean exposed treated surface of 1.13 mm and 0.57 mm, respectively. The implant osseointegration success rate at 12 months was 100% in both groups. Within the limitations of this study, bone loss was found to be greater in the case of the subcrestal implants, though from the

  8. The diagnosis of breast implant rupture

    DEFF Research Database (Denmark)

    Hölmich, Lisbet R; Vejborg, Ilse; Conrad, Carsten

    2005-01-01

    STUDY OBJECTIVE: The aim of this study was to evaluate the accuracy of Magnetic Resonance Imaging (MRI) as performed according to a strict study protocol in diagnosing rupture of silicone breast implants. MATERIAL AND METHODS: The study population consisted of 64 women with 118 implants, who had...... participated in either one or two study MRI examinations, aiming at determining the prevalence and incidence of silent implant rupture, respectively, and who subsequently underwent explantation. Implant rupture status was determined by four independent readers and a consensus diagnosis of either rupture...... (intracapsular or extracapsular), possible rupture or intact implant was then obtained. Strict predetermined rupture criteria were applied as described in this report and findings at surgery were abstracted in a standardised manner and results compared. RESULTS: At MRI, 66 implants were diagnosed as ruptured...

  9. Implant supported overdentures--the Copenhagen experience

    DEFF Research Database (Denmark)

    Gotfredsen, K

    1997-01-01

    OBJECTIVES: To evaluate the functional and biological effect of implant-supported overdenture treatment in the lower jaw. METHODS AND MATERIALS: Thirty-two patients were consecutively treated with Astra Tech implants in the lower jaw for retaining overdentures. All implants had a diameter of 3.5 mm...... and all but two of the implants were longer than 10 mm. For the implant supported overdentures two methods of attachment were used, a bar or a ball. RESULTS: One of 69 fixtures was lost during the 4-5 year observation period. The mean bone loss for all fixtures was less than 0.2 mm per year. Complications...... quality and quantity is sufficient, two implants can support an overdenture in the lower jaw, providing prosthesis which functions well....

  10. Immediate Implants: Clinical Guidelines for Esthetic Outcomes

    Directory of Open Access Journals (Sweden)

    Mohammad A. Javaid

    2016-06-01

    Full Text Available Research has shown that tooth loss results in morphological changes in alveolar ridge that may influence the subsequent implant placement. Immediate implant placement was introduced as a possible means to limit bone resorption and reduce the number of surgical procedures following tooth extraction. Histological and clinical evidence from human clinical studies showing efficacy of immediate implants has come to light over the last decade or so. However, immediate implant placement is a challenging surgical procedure and requires proper case selection and surgical technique. Furthermore, there appears to be a lack of clinical guidelines for immediate implant placement case selection. Therefore, the aim of this mini-review is to analyze critical evidence from human studies in order to establish clinical guidelines which may help clinicians in case selection when considering immediate implant placement protocol.

  11. RFID technology for human implant devices

    Science.gov (United States)

    Aubert, Hervé

    2011-09-01

    This article presents an overview on Radio Frequency Identification (RFID) technology for human implants and investigates the technological feasibility of such implants for locating and tracking persons or for remotely controlling human biological functions. Published results on the miniaturization of implantable passive RFID devices are reported as well as a discussion on the choice of the transmission frequency in wireless communication between a passive RFID device implanted inside human body and an off-body interrogator. The two techniques (i.e., inductive coupling and electromagnetic coupling) currently used for wirelessly supplying power to and read data from a passive implantable RFID device are described and some documented biomedical and therapeutic applications of human RFID-implant devices are finally reported.

  12. Flapless implant surgery: an experimental study.

    Science.gov (United States)

    Jeong, Seung-Mi; Choi, Byung-Ho; Li, Jingxu; Kim, Han-Sung; Ko, Chang-Yong; Jung, Jae-Hyung; Lee, Hyeon-Jung; Lee, Seoung-Ho; Engelke, Wilfried

    2007-07-01

    The purpose of this study was to examine the effect of flapless implant surgery on crestal bone loss and osseointegration in a canine mandible model. In 6 mongrel dogs, bilateral, edentulated, flat alveolar ridges were created in the mandible. After 3 months of healing, 2 implants in each side were placed by either flap or flapless procedures. After a healing period of 8 weeks, microcomputerized tomography at the implantation site was performed. Osseointegration was calculated as percentage of implant surface in contact with bone. Additionally, bone height was measured in the peri-implant bone. The mean osseointegration was greater at flapless sites (70.4%) than at sites with flaps (59.5%) (P flapless sites (10.1 mm) than at sites with flaps (9.0 mm) (P Flapless surgery can achieve results superior to surgery with reflected flaps. The specific improvements of this technique include enhanced osseointegration of dental implants and increased bone height.

  13. Methods to measure stability of dental implants

    Directory of Open Access Journals (Sweden)

    Shruti Digholkar

    2014-01-01

    Full Text Available Dental implant treatment is an excellent option for prosthetic restoration that is associated with high success rates. Implant stability is essential for a good outcome. The clinical assessment of osseointegration is based on mechanical stability rather than histological criteria, considering primary stability (absence of mobility in bone bed after implant insertion and secondary stability (bone formation and remodeling at implant-bone interface. However, due to the invasive nature of the histological methods various other methods have been proposed: Radiographs, the surgeon′s perception, Insertion torque (cutting torque analysis, seating torque, reverse torque testing, percussion testing, impact hammer method, pulsed oscillation waveform, implant mobility checker, Periotest, resonance frequency analysis. This review focuses on the methods currently available for the evaluation of implant stability.

  14. Bilateral versus unilateral cochlear implantation in young children.

    NARCIS (Netherlands)

    Tait, M.; Nikolopoulos, T.P.; Raeve, L. De; Johnson, S.; Datta, G.; Karltorp, E.; Ostlund, E.; Johansson, U.; Knegsel, E. van; Mylanus, E.A.M.; Gulpen, P.M.H.; Beers, M. van; Frijns, J.H.

    2010-01-01

    OBJECTIVES: To compare the preverbal communication skills of two groups of young implanted children: those with unilateral implantation and those with bilateral implantation. MATERIAL AND METHODS: The study assessed 69 children: 42 unilaterally and 27 bilaterally implanted with age at implantation

  15. Clinical management of implant prostheses in patients with bruxism

    NARCIS (Netherlands)

    Komiyama, O.; Lobbezoo, F.; de Laat, A.; Iida, T.; Kitagawa, T.; Murakami, H.; Kato, T.; Kawara, M.

    2012-01-01

    There is general agreement that excessive stress to the bone-implant interface may result in implant overload and failure. Early failure of the implant due to excessive loading occurs shortly after uncovering the implant. Excess load on a final restoration after successful implant integration can

  16. One-stage explant-implant procedure of exposed porous orbital implants

    DEFF Research Database (Denmark)

    Toft, Peter B; Rasmussen, Marie L Roed; Prause, Jan Ulrik

    2011-01-01

    Purpose:  To investigate the risks of implant exposure after a combined explant-implant procedure in patients with an exposed porous orbital implant. Methods:  Twenty-four consecutive patients who had a combined explant-implant procedure of an exposed hydroxyapatite (21) or porous polyethylene (3......) orbital implant from January 2000 to February 2009 were included. The patient records were reviewed; patients were interviewed by telephone and invited for a clinical examination. Histopathological examination was carried out on the removed implants. Main outcome measures were: presence of exposure...... of the new implant or not, patient graded satisfaction with the cosmetic result, and presence of poor motility. Results:  None of the new implants became exposed or infected in the follow-up period of 25 [3-94] months (median [range]). The patients scored their satisfaction with the cosmetic result...

  17. Prevalence of peri-implant disease on platform switching implants: a cross-sectional pilot study

    National Research Council Canada - National Science Library

    Duque, Andrés Duque; Aristizabal, Astrid Giraldo; Londoño, Susana; Castro, Lida; Alvarez, Luis Gonzalo

    2016-01-01

    The objective of this study was to assess the prevalence of mucositis and peri-implantitis associated with the use of two types of implants-conventional versus platform switching after one year of loading...

  18. Bacteremia following dental implant surgery: Preliminary results

    OpenAIRE

    Bölükbas, Nilüfer; Özdemi, Tayfun; Öksüz, Lütfiye; Gürler, Nezahat

    2011-01-01

    Objectives: The aims of this study were to investigate the incidence of bacteremia, bacteriology and antibiotic susceptibility against to causative bacteria associated with dental implant installation. Study Design: 30 generally healthy patients were enrolled in this study. Blood samples were collected at baseline and at 30 minutes after dental implant installation and 24 hours after dental implant surgery. Blood samples were cultured in a BACTEC system. The isolated bacteria were identified ...

  19. Strain driven fast osseointegration of implants

    Directory of Open Access Journals (Sweden)

    Wiesmann Hans-Peter

    2005-09-01

    Full Text Available Abstract Background Although the bone's capability of dental implant osseointegration has clinically been utilised as early as in the Gallo-Roman population, the specific mechanisms for the emergence and maintenance of peri-implant bone under functional load have not been identified. Here we show that under immediate loading of specially designed dental implants with masticatory loads, osseointegration is rapidly achieved. Methods We examined the bone reaction around non- and immediately loaded dental implants inserted in the mandible of mature minipigs during the presently assumed time for osseointegration. We used threaded conical titanium implants containing a titanium2+ oxide surface, allowing direct bone contact after insertion. The external geometry was designed according to finite element analysis: the calculation showed that physiological amplitudes of strain (500–3,000 ustrain generated through mastication were homogenously distributed in peri-implant bone. The strain-energy density (SED rate under assessment of a 1 Hz loading cycle was 150 Jm-3 s-1, peak dislocations were lower then nm. Results Bone was in direct contact to the implant surface (bone/implant contact rate 90% from day one of implant insertion, as quantified by undecalcified histological sections. This effect was substantiated by ultrastructural analysis of intimate osteoblast attachment and mature collagen mineralisation at the titanium surface. We detected no loss in the intimate bone/implant bond during the experimental period of either control or experimental animals, indicating that immediate load had no adverse effect on bone structure in peri-implant bone. Conclusion In terms of clinical relevance, the load related bone reaction at the implant interface may in combination with substrate effects be responsible for an immediate osseointegration state.

  20. Early History and Challenges of Implantable Electronics

    OpenAIRE

    KO, WEN H.

    2012-01-01

    Implantable systems for biomedical research and clinical care are now a flourishing field of activities in academia as well as industrial institutions. The broad field includes experimental explorations in electronics, mechanical, chemical, and biological components and systems, and the combination of all these. Today virtually all implants involve both electronic circuits and micro-electro-mechanical-systems (MEMS). This article offers a very brief glance back at the early history of implant...

  1. Periapical implant lesion: A systematic review.

    Science.gov (United States)

    Blaya-Tárraga, J-A; Cervera-Ballester, J; Peñarrocha-Oltra, D; Peñarrocha-Diago, M

    2017-11-01

    The aim of this study was to systematically review the evidence for periapical implant lesion, which makes a patient more susceptible to the periapical lesion, frequency, symptoms, signs (including radiological findings) and possible treatment options. A systematic literature review and analysis of publications included in PubMed, Embase and Cochrane; articles published until March 2016; with a populations, exposures and outcomes (PEO) search strategy was performed, focused on the issue: "In patients with periapical lesion to the implant during the osseointegration, what symptoms, signs, and changes in complementary examination manifested, for according to that stage, be intervened with the appropriate approach?". The set criteria for inclusion were peer-reviewed articles. From a total of 212 papers identified, 36 studies were included in this systematic review, with 15461 implants evaluated and 183 periapical implant lesions. Which 8 papers included more than 5 cases and 28 included equal or less than 5 cases. Analysis of the papers revealed that periapical implant lesion is classified according to evolution stages into acute (non-suppurated and suppurated) and subacute (or suppurated-fistulized). In the acute stage and in the subacute if there is no loss of implant stability, the correct treatment approach is implant periapical surgery. In the subacute stage associated with implant mobility the implant must be removed. Evidence on the subject is very limited, there are few studies with small sample, without homogeneity of criteria for diagnosing the disease and without design of scientific evidence. Currently etiology lacks consensus. The early diagnosis of periapical implant periapical lesions during the osseointegration phase and early treatment, will lead to a higher survival rate of implants treated, hence preventing the need for implant extraction.

  2. Immediate Implant Placement: Report of Case Series

    Directory of Open Access Journals (Sweden)

    Koray M.

    2015-07-01

    Full Text Available Objective: The aim of this study was to evaluate the outcome of immediate postextraction implant placement. Immediate placement of dental implants have been claimed of the potential advantages such as reductions in the number of surgical interventions, a shorter treatment time, an ideal 3-dimensional implant positioning, the presumptive preservation of alveolar bone at the site of the tooth extraction and soft tissue aesthetics.

  3. Dental Implants: Plasma polymerization for antibacterial coatings

    OpenAIRE

    Buxadera Palomero, Judit; Canal Barnils, Cristina; Gil Mur, Francisco Javier; Rodríguez Rius, Daniel

    2016-01-01

    Dental implants are widely used to overcome tooth loss. The material of choice for this application is titanium, due to its excellent mechanical properties, high corrosion resistance, and high biocompatibility. Despite the high success rate of titanium dental implants, there are a significant number of failures due to the infection of the surrounding tissues. The best way to avoid infections related to the use of dental implants is to achieve an antibacterial surface, either by physical or ch...

  4. Antibacterial PHAs coating for titanium implants

    OpenAIRE

    Rodriguez Contreras, Alejandra; Garcia, Yolanda; Manero Planella, José María; Rupérez de Gracia, Elisa

    2017-01-01

    Biomaterial-associated infection is a serious complication of modern implantation surgery. Thus, the improvement of implant surfaces is required to avoid the first stage for biofilm formation, bacterial adhesion. The current research addresses this issue by developing drug delivery systems (DDS) consisting of antibiotic-loaded polyhydroxyalkanoates (PHAs) coatings on titanium implants. Dip-coating technique was used to achieve optimal coatings with biodegradable biopolyesters, polyhydroxybuty...

  5. VENTRAL SPONDYLODESIS BYTITAN IMPLANTS AT SPINE TUMORS

    Directory of Open Access Journals (Sweden)

    A. V. Babkin

    2010-01-01

    Full Text Available At RSPC of traumatology and orthopaedic surgery and Institute of powders metallurgic porous implants are working out which allow complitely replace alio- and autotranplants and improve the surgical technology of interbody spondylodesis. Porous implants, made from mechanic durabilities, are bioinert or biocompatible materials, provide durabilities prime spondylodesis. It doesn't need an additional fixation, realize a possibility to grow a bone matter in powder structure of implants.

  6. Survival analysis of orthodontic mini-implants.

    Science.gov (United States)

    Lee, Shin-Jae; Ahn, Sug-Joon; Lee, Jae Won; Kim, Seong-Hun; Kim, Tae-Woo

    2010-02-01

    Survival analysis is useful in clinical research because it focuses on comparing the survival distributions and the identification of risk factors. Our aim in this study was to investigate the survival characteristics and risk factors of orthodontic mini-implants with survival analyses. One hundred forty-one orthodontic patients (treated from October 1, 2000, to November 29, 2007) were included in this survival study. A total of 260 orthodontic mini-implants that had sandblasted (large grit) and acid-etched screw parts were placed between the maxillary second premolar and the first molar. Failures of the implants were recorded as event data, whereas implants that were removed because treatment ended and those that were not removed during the study period were recorded as censored data. A nonparametric life table method was used to visualize the hazard function, and Kaplan-Meier survival curves were generated to identify the variables associated with implant failure. Prognostic variables associated with implant failure were identified with the Cox proportional hazard model. Of the 260 implants, 22 failed. The hazard function for implant failure showed that the risk is highest immediately after placement. The survival function showed that the median survival time of orthodontic mini-implants is sufficient for relatively long orthodontic treatments. The Cox proportional hazard model identified that increasing age is a decisive factor for implant survival. The decreasing pattern of the hazard function suggested gradual osseointegration of orthodontic mini-implants. When implants are placed in a young patient, special caution is needed to lessen the increased probability of failure, especially immediately after placement.

  7. Relation between bruxism and dental implants

    OpenAIRE

    Torcato, Leonardo Bueno [UNESP; Zuim,Paulo Renato Junqueira; Brandini, Daniela Atili; Falcón-Antenucci, Rosse Mary [UNESP

    2014-01-01

    OBJECTIVE: The aim of this study was to gather information and discuss the predictability of implant-supported prostheses in patients with bruxism by performing a literature review.METHODS: In order to select the studies included in this review, a detailed search was performed in PubMed and Medlinedatabases, using the following key words: bruxism, dental implants, implant supported prosthesis, and dental restoration failure. Items that were included are: case reports, randomized controlled tr...

  8. RFID Technology for Human Implant Devices

    OpenAIRE

    Aubert, Hervé

    2011-01-01

    International audience; This paper presents an overview on Radio Frequency Identification (RFID) technology for human implants and investigates the technological feasibility of such implants for locating and tracking persons or for remotely controlling human biological functions. Published results on the miniaturization of implantable passive RFID devices are reported as well as a discussion on the choice of the transmission frequency in wireless communication between passive RFID device impl...

  9. Neural Implants, Packaging for Biocompatible Implants, and Improving Fabricated Capacitors

    Science.gov (United States)

    Agger, Elizabeth Rose

    We have completed the circuit design and packaging procedure for an NIH-funded neural implant, called a MOTE (Microscale Optoelectronically Transduced Electrode). Neural recording implants for mice have greatly advanced neuroscience, but they are often damaging and limited in their recording location. This project will result in free-floating implants that cause less damage, provide rapid electronic recording, and increase range of recording across the cortex. A low-power silicon IC containing amplification and digitization sub-circuits is powered by a dual-function gallium arsenide photovoltaic and LED. Through thin film deposition, photolithography, and chemical and physical etching, the Molnar Group and the McEuen Group (Applied and Engineering Physics department) will package the IC and LED into a biocompatible implant approximately 100microm3. The IC and LED are complete and we have begun refining this packaging procedure in the Cornell NanoScale Science & Technology Facility. ICs with 3D time-resolved imaging capabilities can image microorganisms and other biological samples given proper packaging. A portable, flat, easily manufactured package would enable scientists to place biological samples on slides directly above the Molnar group's imaging chip. We have developed a packaging procedure using laser cutting, photolithography, epoxies, and metal deposition. Using a flip-chip method, we verified the process by aligning and adhering a sample chip to a holder wafer. In the CNF, we have worked on a long-term metal-insulator-metal (MIM) capacitor characterization project. Former Fellow and continuing CNF user Kwame Amponsah developed the original procedure for the capacitor fabrication, and another former fellow, Jonilyn Longenecker, revised the procedure and began the arduous process of characterization. MIM caps are useful to clean room users as testing devices to verify electronic characteristics of their active circuitry. This project's objective is to

  10. Implant Materials Generate Different Peri-implant Inflammatory Factors

    Science.gov (United States)

    Olivares-Navarrete, Rene; Hyzy, Sharon L.; Slosar, Paul J.; Schneider, Jennifer M.; Schwartz, Zvi

    2015-01-01

    Study Design. An in vitro study examining factors produced by human mesenchymal stem cells on spine implant materials. Objective. The aim of this study was to examine whether the inflammatory microenvironment generated by cells on titanium-aluminum-vanadium (Ti-alloy, TiAlV) surfaces is affected by surface microtexture and whether it differs from that generated on poly-ether-ether-ketone (PEEK). Summary of Background Data. Histologically, implants fabricated from PEEK have a fibrous connective tissue surface interface whereas Ti-alloy implants demonstrate close approximation with surrounding bone. Ti-alloy surfaces with complex micron/submicron scale roughness promote osteoblastic differentiation and foster a specific cellular environment that favors bone formation whereas PEEK favors fibrous tissue formation. Methods. Human mesenchymal stem cells were cultured on tissue culture polystyrene, PEEK, smooth TiAlV, or macro-/micro-/nano-textured rough TiAlV (mmnTiAlV) disks. Osteoblastic differentiation and secreted inflammatory interleukins were assessed after 7 days. Fold changes in mRNAs for inflammation, necrosis, DNA damage, or apoptosis with respect to tissue culture polystyrene were measured by low-density polymerase chain reaction array. Data were analyzed by analysis of variance, followed by Bonferroni's correction of Student's t-test. Results. Cells on PEEK upregulated mRNAs for chemokine ligand-2, interleukin (IL) 1β, IL6, IL8, and tumor necrosis factor. Cells grown on the mmnTiAlV had an 8-fold reduction in mRNAs for toll-like receptor-4. Cells grown on mmnTiAlV had reduced levels of proinflammatory interleukins. Cells on PEEK had higher mRNAs for factors strongly associated with cell death/apoptosis, whereas cells on mmnTiAlV exhibited reduced cytokine factor levels. All results were significant (P < 0.05). Conclusion. These results suggest that fibrous tissue around PEEK implants may be due to several factors: reduced osteoblastic differentiation of

  11. A Murine Model of Lipopolysaccharide-Induced Peri-Implant Mucositis and Peri-Implantitis.

    Science.gov (United States)

    Pirih, Flavia Q; Hiyari, Sarah; Leung, Ho-Yin; Barroso, Ana D V; Jorge, Adrian C A; Perussolo, Jeniffer; Atti, Elisa; Lin, Yi-Ling; Tetradis, Sotirios; Camargo, Paulo M

    2015-10-01

    Dental implants are a widely used treatment option for tooth replacement. However, they are susceptible to inflammatory diseases such as peri-implant mucositis and peri-implantitis, which are highly prevalent and may lead to implant loss. Unfortunately, the understanding of the pathogenesis of peri-implant mucositis and peri-implantitis is fragmented and incomplete. Therefore, the availability of a reproducible animal model to study these inflammatory diseases would facilitate the dissection of their pathogenic mechanisms. The objective of this study is to propose a murine model of experimental peri-implant mucositis and peri-implantitis. Screw-shaped titanium implants were placed in the upper healed edentulous alveolar ridges of C57BL/6J mice 8 weeks after tooth extraction. Following 4 weeks of osseointegration, Porphyromonas gingivalis -lipolysaccharide (LPS) injections were delivered to the peri-implant soft tissues for 6 weeks. No-injections and vehicle injections were utilized as controls. Peri-implant mucositis and peri-implantitis were assessed clinically, radiographically (microcomputerized tomograph [CT]), and histologically following LPS-treatment. LPS-injections resulted in a significant increase in soft tissue edema around the head of the implants as compared to the control groups. Micro-CT analysis revealed significantly greater bone loss in the LPS-treated implants. Histological analysis of the specimens demonstrated that the LPS-group had increased soft tissue vascularity, which harbored a dense mixed inflammatory cell infiltrate, and the bone exhibited noticeable osteoclast activity. The induction of peri-implant mucositis and peri-implantitis in mice via localized delivery of bacterial LPS has been demonstrated. We anticipate that this model will contribute to the development of more effective preventive and therapeutic approaches for these 2 conditions.

  12. A new, simple implant-level impression technique for dental implants in limited interproximal space.

    Science.gov (United States)

    Saboury, Aboulfazl; Hadi, Alireza

    2012-06-01

    Making an implant-level impression when implants are placed in limited interproximal space or compromising angulations can be a time-consuming procedure. This article presents a new method for developing a master cast for two implants clinically placed convergent and very close to each other. The technique consists of making an implant-level impression using a transfer jig fabricated on dental abutments. © 2012 by the American College of Prosthodontists.

  13. Conical polyurethane implants: an uplifting augmentation.

    Science.gov (United States)

    Georgeu, Garrick A; Frame, James D; Frame, James D

    2013-11-01

    Polyurethane-coated conical implants were introduced by Silimed (US distributor: Sientra, Santa Barbara, California) in 2008 and offer an alternative to round or anatomically shaped implants. By their design and volume distribution, they naturally create central volume and give a reasonable fullness to the upper pole while lifting some ptotic breasts, thus avoiding the need for classical mastopexy. The authors discuss the advantages of conical implants as an alternative to conventional silicone implants for women with breast ptosis. In the 2-year period between December 2010 and December 2012, a consecutive series of 302 women underwent implant-based breast surgery procedures (236 primary augmentations, 59 revisions, and 7 mastopexy-augmentations) with conical polyurethane devices. Implant volumes ranged from 225 to 560 cc, with low- to medium-profile devices predominating. No extra-high-profile implants were used. Only 1 patient had a drain inserted on completion of a revision augmentation. There were no infections (0%) and no wound dehiscence (0%). Four cases required reoperation (1.3%). Patient satisfaction scores were universally high (average, 9.94/10). There have been no capsular contractures to date, but follow-up is short. The modern conical, polyurethane implant has many advantages over the conventional round or anatomically shaped implants and offers patients an ideal compromise between volume, natural upper pole fullness, and a lift without mastopexy scars.

  14. Preventing complications in pediatric cochlear implantation.

    Science.gov (United States)

    Melton, Myles F; Backous, Douglas D

    2011-10-01

    This review addresses four key areas of controversy in the prevention of common complications of pediatric cochlear implant surgery: reducing meningitis risk, managing acute otitis media (AOM) in the cochlear implant population, assessing the optimum age for implanting a child to take advantage of the critical periods of language acquisition, and managing the social risk in defining ethical issues still surrounding cochlear implant in children. Improved surgical techniques and the replacement of Prenvar-7 with Prenvar-13 significantly reduce the risk of cochlear implant related meningitis. AOM within 2 months of cochlear implant placement requires aggressive management to reduce the risk of complication. Tympanostomy tubes do not increase the risk of otitis media or meningitis and should be used when appropriate according to accepted AOM standards. Although the controversy over cochlear implant and the dissolution of Deaf Culture is decreasing, the use of cochlear implant in children remains an area for open dialogue between groups to ensure children are treated appropriately. Discussions ought to be based on fact and scientific evidence. Although cochlear implants remain the gold standard for hearing restoration in children with severe to profound hearing loss, several issues remain controversial and are in need of further scientific exploration.

  15. Method for the placement of palatal implants.

    Science.gov (United States)

    Tosun, Tosun; Keles, Ahmet; Erverdi, Nejat

    2002-01-01

    Palatal implants have been used in the last 2 decades to eliminate headgear wear and to establish stationary anchorage. The aim of this investigation was to establish a method and easy protocol for palatal implant placement. The study comprised 8 male and 15 female patients each having a 4.5 x 8-mm stepped screw titanium implant placed in the palatal region for orthodontic purposes. A surgical template containing metal drill housing was prepared. Angulation of the drill housing was controlled according to the radiologic tracing of the maxilla transferred to a plaster cast section in the paramedian plane. Implants were placed using a noninvasive technique (incision, flap, and suture elimination) and left transmucosally to facilitate the surgical procedure and reduce operations. The paramedian region was selected so as to avoid connective tissues of the palatine suture and because it was considered to be a suitable host site for implant placement. After 3 months of healing, all implants were osseointegrated and no implant was lost throughout the orthodontic treatment. Palatal implants can be used effectively for anchorage maintenance and space-gaining procedures. Usage of a 3-dimensional surgical template eliminated faulty implant placement, reduced chair time, and minimized trauma to the tissues while enhancing osseointegration.

  16. Update in dental implant periapical surgery.

    Science.gov (United States)

    Peñarrocha Diago, Miguel; Boronat López, Araceli; Lamas Pelayo, Joana

    2006-08-01

    Implant periapical lesions are infectious-inflammatory alterations surrounding an implant apex, and can be caused by a number of situations--including contamination at instrumentation, overheating of bone, and the prior existence of bone pathology. The diagnosis is based on the clinical manifestations and radiological findings, where a radiotransparency can be seen at periapical level. The lesions are classified according to their evolutive stage as either acute (non-suppurated and suppurated) or chronic (or periapical abscess). The management of implant periapical lesions comprises periapical surgery with curettage and irrigation in the acute phase, or implant extraction when the bone surface is affected and/or primary fixation is lost (chronic phase).

  17. Periodontio-integrated implants: A revolutionary concept

    Directory of Open Access Journals (Sweden)

    Minkle Gulati

    2014-01-01

    Full Text Available Though the fields of regenerative dentistry and tissue engineering have undergone significant advancements, yet its application to the field of implant-dentistry is lacking; in the sense that presently the implants are being placed with the aim of attaining osseointegration without giving consideration to the regeneration of periodontium around the implant. The following article reveals the clinical benefits of such periodontio-integrated implants and reviews the relevant scientific proofs. A comprehensive research to provide scientific evidence supporting the feasibility of periodontio-integrated implants was carried out using various online resources such as PubMed, Wiley-Blackwell, Elsevier etc., to retrieve studies published between 1980 and 2012 using the following key words: "implant," "tissue engineering," "periodontium," "osseo-integration," "osseoperception," "regeneration" (and their synonyms and it was found that in the past three decades, several successful experiments have been conducted to devise "implant supported by the periodontium"that can maintain form, function and potential proprioceptive responses similar to a natural tooth. Based on these staunch evidences, the possibility of the future clinical use of such implant can be strongly stated which would revolutionize the implant dentistry and will be favored by the patients as well. However, further studies are required to validate the same.

  18. [Comperative study of implant surface characteristics].

    Science.gov (United States)

    Katona, Bernadett; Daróczi, Lajos; Jenei, Attila; Bakó, József; Hegedus, Csaba

    2013-12-01

    The osseointegration between the implant and its' bone environment is very important. The implants shall meet the following requirements: biocompatibility, rigidity, resistance against corrosion and technical producibility. In our present study surface morphology and material characteristics of different implants (Denti Bone Level, Denti Zirconium C, Bionika CorticaL, Straumann SLA, Straumann SLA Active, Dentsply Ankylos and Biotech Kontact implant) were investigated with scanning electron microscopy and energy-dispersive X-ray spectroscopy. The possible surface alterations caused by the manufacturing technology were also investigated. During grit-blasting the implants' surface is blasted with hard ceramic particles (titanium oxide, alumina, calcium phosphate). Properties of blasting material are critical because the osseointegration of dental implants should not be hampered. The physical and chemical features of blasting particles could importantly affect the produced surfaces of implants. Titanium surfaces with micro pits are created after immersion in mixtures of strong acids. On surfaces after dual acid-etching procedures the crosslinking between fibrin and osteogenetic cells could be enhanced therefore bone formation could be directly facilitated on the surface of the implant. Nowadays there are a number of surface modification techniques available. These can be used as a single method or in combination with each other. The effect of the two most commonly used surface modifications (acid-etching and grit-blasting) on different implants are demonstrated in our investigation.

  19. Anterior chamber intra ocular lens implantation.

    OpenAIRE

    Raju N

    1989-01-01

    The role of A.C. IOL in modern implant surgery has become somewhat debatable, since, the choice procedure to day is undoubtedly an ECCE with a PC lens implant preferably in the capsular bag. Even so, anterior chamber lens implantation has its definite indications. As such it is necessary for the implant surgeon to be familiar with the latest technique in this modality of surgery as well. Many of the complications of earlier rigid model AC IOLs were mainly due to defective lens design. With th...

  20. Osseointegration of cobalt-chrome alloy implants.

    Science.gov (United States)

    Mavrogenis, Andreas F; Papagelopoulos, Panayiotis J; Babis, George C

    2011-01-01

    Osseointegration or osteointegration refers to a direct bone-to-metal interface without interposition of non-bone tissue. The long-term clinical success of bone implants is critically related to wide bone-to-implant direct contact. However, only poor bone formation or even host bone resorption have been shown where bone is in tight contact with the implant surface. It has been suggested that an appropriate space between implant and host bone may be useful for early peri-implant bone formation. Additionally, osseointegration depends on the topographical and chemical characteristics of the implant surface. Cobalt-chrome (Co-Cr) is a metal alloy of cobalt and chromium. Because of its high strength, temperature endurance and wear resistance, it is commonly used in dental and orthopedic implants. In orthopedic implants it is usually composed of cobalt with chromium, molybdenum, and traces of other elements. Co-Cr alloys are especially useful where high stiffness or a highly polished and extremely wear-resistant material is required. This article reviews the Co-Cr alloy orthopedic implants in terms of their properties, porous coating, osseointegration, outcome, and failure.

  1. Digital photoelastic analysis applied to implant dentistry

    Science.gov (United States)

    Ramesh, K.; Hariprasad, M. P.; Bhuvanewari, S.

    2016-12-01

    Development of improved designs of implant systems in dentistry have necessitated the study of stress fields in the implant regions of the mandible/maxilla for better understanding of the biomechanics involved. Photoelasticity has been used for various studies related to dental implants in view of whole field visualization of maximum shear stress in the form of isochromatic contours. The potential of digital photoelasticity has not been fully exploited in the field of implant dentistry. In this paper, the fringe field in the vicinity of the connected implants (All-On-Four® concept) is analyzed using recent advances in digital photoelasticity. Initially, a novel 3-D photoelastic model making procedure, to closely mimic all the anatomical features of the human mandible is proposed. By choosing appropriate orientation of the model with respect to the light path, the essential region of interest were sought to be analysed while keeping the model under live loading conditions. Need for a sophisticated software module to carefully identify the model domain has been brought out. For data extraction, five-step method is used and isochromatics are evaluated by twelve fringe photoelasticity. In addition to the isochromatic fringe field, whole field isoclinic data is also obtained for the first time in implant dentistry, which could throw important information in improving the structural stability of the implant systems. Analysis is carried out for the implant in the molar as well as the incisor region. In addition, the interaction effects of loaded molar implant on the incisor area are also studied.

  2. Physical modification of polyetheretherketone for orthopedic implants

    Science.gov (United States)

    Du, Ya-Wei; Zhang, Li-Nan; Hou, Zeng-Tao; Ye, Xin; Gu, Hong-Sheng; Yan, Guo-Ping; Shang, Peng

    2014-12-01

    Polyetheretherketone (PEEK) is regarded as one of the most potential candidates for replacing current implant applications. To obtain good bone-implant interfaces, many modification methods have been developed to enable PEEK and PEEK-based composites from bio-inert to bioactive. Among them, physical methods have aroused significant attention and been widely used to modify PEEK for orthopedic implants. This review summarizes current physical modification techniques of PEEK for orthopedic applications, which include composite strategies, surface coating methods and irradiation treatments. The positive consequences of those modification methods will encourage continuing investigations and stimulate the wide range of applications of PEEK-based implants in orthopedics.

  3. Implants and inflammation - Where is the future?

    Directory of Open Access Journals (Sweden)

    Karim El Kholy

    2015-01-01

    Full Text Available The demand for dental implants continues to increase. Implants have replaced fixed and removable prosthetics as the gold standard for replacing missing teeth. Despite the success of the majority of dental implants, biological complications in the form of peri-implant inflammation are common and present as a challenge for both patients and clinicians. The pathogenesis of peri-implantitis was found to be similar to periodontitis. Both are initiated by a bacterial biofilm composed of similar micro-organisms. The inflammatory reaction to the established biofilm is responsible for disease progression and most of the resultant tissue destruction. Treatment strategies for peri-implantitis have mainly been focused on the removal of the bacterial etiology. Limited access and implant surface roughness have proven to be tough challenges for decontaminating exposed implant surfaces. The few attempts using host modulating agents have been abandoned due to drug-associated side effects. Recently, new signaling pathways and molecules involved in the natural resolution of inflammation have been discovered. These indigenous proresolving lipid mediator receptor agonists, such as lipoxins, resolvins, and protectins, provide an opportunity to regulate inflammation in chronic inflammatory diseases such as peri-implantitis while avoiding the undesirable side effects of inhibitory pharmacological agents.

  4. Could cytokine levels in the peri-implant crevicular fluid be used to distinguish between healthy implants and implants with peri-implantitis? A systematic review.

    Science.gov (United States)

    Duarte, P M; Serrão, C R; Miranda, T S; Zanatta, L C S; Bastos, M F; Faveri, M; Figueiredo, L C; Feres, M

    2016-12-01

    Despite investigative efforts to identify the levels of different types of cytokines in the peri-implant crevicular fluid (PICF), the efficacy of these biomarkers in assisting the diagnosis of peri-implantitis is still undetermined. This systematic review aimed to answer the following question: "Could cytokine levels in the PICF be used to distinguish between healthy implants and implants with peri-implantitis?" This review was conducted and reported in accordance with the PRISMA statement. The MEDLINE and EMBASE databases were searched from 1990 up to and including March 2015, using MeSH terms and other keywords. Additional publications were searched using a hand search of reference lists of relevant studies. Titles and abstracts were screened and papers that fulfilled eligibility criteria were assessed. Out of 1212 titles, 18 studies reporting the levels of nine different cytokines were included. Proinflammatory cytokines [interleukin (IL)-1β, IL-6, IL-12, IL-17 and tumor necrosis factor-α) were the cytokines studied most commonly, followed by anti-inflammatory cytokines (IL-4 and IL-10), osteoclastogenesis-related cytokines (RANKL) and chemokines (IL-8). Nine studies reported statistically significantly higher levels of proinflammatory cytokines in the PICF of implants with peri-implantitis than in the PICF of healthy implants. Most studies did not find any significant differences in the PICF levels of anti-inflammatory cytokines and RANKL between healthy implants and implants with peri-implantitis. IL-8 was the only chemokine studied and its levels did not differ significantly between healthy and diseased implants. The studies differed greatly in the manner in which they reported the results (e.g. concentrations or total amounts) and in the exclusion of confounders, such as smoking. The results of this systematic review indicate moderate evidence in the literature to support that implants with peri-implantitis present higher levels of proinflammatory

  5. Dental implants in oral cancer reconstruction.

    Science.gov (United States)

    Kim, D David; Ghali, G E

    2011-05-01

    Endosseous implants have revolutionized dental prosthetic rehabilitation, providing a reliable, a stable, and an aesthetic option for dental reconstruction. Dental implants have similarly improved the functionality of reconstructions following cancer surgery. The use of dental implants in oral cancer reconstruction can be divided into 2 categories: (1), for retention of a prosthetic device, for example, palatal obturator, used as the primary means of maxillary reconstruction, and (2), for dental rehabilitation after bony reconstruction of the jaws. This article discusses these different uses of endosseous implants in patients with head and neck cancer. Copyright © 2011 Elsevier Inc. All rights reserved.

  6. Implant Rehabilitation For Atrophic Maxilla: A Review

    National Research Council Canada - National Science Library

    Ali, Seyed Asharaf; Karthigeyan, Suma; Deivanai, Mangala; Kumar, Arun

    2014-01-01

    .... Survey of various literatures using internet sources, manual searches, and common textbooks on dental implants shows, that a thorough knowledge of conventional augmentation procedures such as bone...

  7. Custom implant design for large cranial defects.

    Science.gov (United States)

    Marreiros, Filipe M M; Heuzé, Y; Verius, M; Unterhofer, C; Freysinger, W; Recheis, W

    2016-12-01

    The aim of this work was to introduce a computer-aided design (CAD) tool that enables the design of large skull defect (>100 [Formula: see text]) implants. Functional and aesthetically correct custom implants are extremely important for patients with large cranial defects. For these cases, preoperative fabrication of implants is recommended to avoid problems of donor site morbidity, sufficiency of donor material and quality. Finally, crafting the correct shape is a non-trivial task increasingly complicated by defect size. We present a CAD tool to design such implants for the neurocranium. A combination of geometric morphometrics and radial basis functions, namely thin-plate splines, allows semiautomatic implant generation. The method uses symmetry and the best fitting shape to estimate missing data directly within the radiologic volume data. In addition, this approach delivers correct implant fitting via a boundary fitting approach. This method generates a smooth implant surface, free of sharp edges that follows the main contours of the boundary, enabling accurate implant placement in the defect site intraoperatively. The present approach is evaluated and compared to existing methods. A mean error of 89.29 % (72.64-100 %) missing landmarks with an error less or equal to 1 mm was obtained. In conclusion, the results show that our CAD tool can generate patient-specific implants with high accuracy.

  8. [Cost Analysis of Cochlear Implantation in Adults].

    Science.gov (United States)

    Raths, S; Lenarz, T; Lesinski-Schiedat, A; Flessa, S

    2016-04-01

    The number of implantation of cochlear implants has steadily risen in recent years. Reasons for this are an extension of indication criteria, demographic change, increased quality of life needs and greater acceptance. The consequences are rising expenditure for statutory health insurance (SHI) for cochlear implantation. A detailed calculation of lifetime costs from SHI's perspective for postlingually deafened adolescents and adults is essential in estimating future cost developments. Calculations are based on accounting data from the Hannover Medical School. With regard to further life expectancy, average costs of preoperative diagnosis, surgery, rehabilitation, follow-ups, processor upgrades and electrical maintenance were discounted to their present value at age of implantation. There is an inverse relation between cost of unilateral cochlear implantation and age of initial implantation. From SHI's perspective, the intervention costs between 36,001 and 68,970 € ($ 42,504-$ 81,429). The largest cost components are initial implantation and processor upgrades. Compared to the UK the cost of cochlear implantation in Germany seems to be significantly lower. In particular the costs of, rehabilitation and maintenance in Germany cause only a small percentage of total costs. Also, the costs during the first year of treatment seem comparatively low. With regard to future spending of SHI due to implant innovations and associated extension of indication, increasing cost may be suspected. © Georg Thieme Verlag KG Stuttgart · New York.

  9. Microstrip gas chambers on implanted substrates

    Energy Technology Data Exchange (ETDEWEB)

    Pallares, A. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Barthe, S. [Laboratoire PHASE (UPR 292 du CNRS), 23 rue du Loess, BP 28, 67037 Strasbourg Cedex 2 (France); Bergtold, A.M. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Brom, J.M. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Cailleret, J. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Christophel, E. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Coffin, J. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Eberle, H. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Fang, R. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Fontaine, J.C. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Geist, W. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Kachelhoffer, T. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Levy, J.M. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Mack, V. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires; Schunck, J.P. [Laboratoire PHASE (UPR 292 du CNRS), 23 rue du Loess, BP 28, 67037 Strasbourg Cedex 2 (France); Sigward, M.H. [Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires

    1995-12-11

    We have studied the performance of several Microstrip Gas Chamber (MSGC) prototypes made on standard Desag D263 boron implanted glass. The purpose of the implantation is to reduce the surface resistance. The long term stability of this implantation has been measured under applied bias voltage. Comparative tests have been carried out on prototypes made on implanted and unimplanted detectors under electron ({sup 90}Sr) and X-ray (8 keV) irradiation. The total dose was approximately 7 mC/cm. (orig.).

  10. Periodontio-integrated implants: A revolutionary concept.

    Science.gov (United States)

    Gulati, Minkle; Anand, Vishal; Govila, Vivek; Jain, Nikil; Rastogi, Pavitra; Bahuguna, Rohit; Anand, Bhargavi

    2014-03-01

    Though the fields of regenerative dentistry and tissue engineering have undergone significant advancements, yet its application to the field of implant-dentistry is lacking; in the sense that presently the implants are being placed with the aim of attaining osseointegration without giving consideration to the regeneration of periodontium around the implant. The following article reveals the clinical benefits of such periodontio-integrated implants and reviews the relevant scientific proofs. A comprehensive research to provide scientific evidence supporting the feasibility of periodontio-integrated implants was carried out using various online resources such as PubMed, Wiley-Blackwell, Elsevier etc., to retrieve studies published between 1980 and 2012 using the following key words: "implant," "tissue engineering," "periodontium," "osseo-integration," "osseoperception," "regeneration" (and their synonyms) and it was found that in the past three decades, several successful experiments have been conducted to devise "implant supported by the periodontium"that can maintain form, function and potential proprioceptive responses similar to a natural tooth. Based on these staunch evidences, the possibility of the future clinical use of such implant can be strongly stated which would revolutionize the implant dentistry and will be favored by the patients as well. However, further studies are required to validate the same.

  11. A Longitudinal Study in Children with Sequential Bilateral Cochlear Implants: Time Course for the Second Implanted Ear and Bilateral Performance

    Science.gov (United States)

    Reeder, Ruth M.; Firszt, Jill B.; Cadieux, Jamie H.; Strube, Michael J.

    2017-01-01

    Purpose: Whether, and if so when, a second-ear cochlear implant should be provided to older, unilaterally implanted children is an ongoing clinical question. This study evaluated rate of speech recognition progress for the second implanted ear and with bilateral cochlear implants in older sequentially implanted children and evaluated localization…

  12. Investigation of the Effects of Abutment and Implant Length on Stability of Short Dental Implants

    Directory of Open Access Journals (Sweden)

    Eda OZYILMAZ

    2015-01-01

    Full Text Available The use of dental implants to solve different problems in dentistry has been growing rapidly. The success rates of dental implants are also very important for patients. Depending on the bone level of patients, short dental implants are very popular and widely used by many dentists. Although many dentists are using short dental implants frequently, It can be guessed that there can be stability problems because of crown to implant ratios. In this study, it is aimed to find out the effects of dental implant and abutment lengths on stability of short dental implants. 3 different short dental implant design made with the use of Solidworks 2013. Abutment lengths were 3,5 mm, 4 mm, 4,5 mm, 5 mm and implant lengths were 5 mm, 6 mm, 7 mm for each model. Human mandible model is transferred from Computed Tomography. Then, each implant model is mounted to modeled mandible and Finite Element Analysis is performed for each model. In order to see the effects of implant number on stability, we performed same analysis by placing 4 implants to the mandible

  13. Implant Insertion Torque: Its Role in Achieving Primary Stability of Restorable Dental Implants.

    Science.gov (United States)

    Greenstein, Gary; Cavallaro, John

    2017-02-01

    A literature review was conducted to determine the role of insertion torque in attaining primary stability of dental implants. The review is comprised of articles that discussed the amount of torque needed to achieve primary implant stability in healed ridges and fresh extraction sockets prior to immediate implant loading. Studies were appraised that addressed the effects of minimum and maximum forces that can be used to successfully place implants. The minimum torque that can be employed to attain primary stability is undefined. Forces ≥30 Ncm are routinely used to place implants into healed ridges and fresh extraction sockets prior to immediate loading of implants. Increased insertion torque (≥50 Ncm) reduces micromotion and does not appear to damage bone. In general, the healing process after implant insertion provides a degree of biologic stability that is similar whether implants are placed with high or low initial insertion torque. Primary stability is desirable when placing implants, but the absence of micromotion is what facilitates predictable implant osseointegration. Increased insertion torque helps achieve primary stability by reducing implant micromotion. Furthermore, tactile information provided by the first surgical twist drill can aid in selecting the initial insertion torque to achieve predictable stability of inserted dental implants.

  14. Azygos Vein Lead Implantation For High Defibrillation Thresholds In Implantable Cardioverter Defibrillator Placement

    Directory of Open Access Journals (Sweden)

    Naga VA Kommuri

    2010-01-01

    Full Text Available Evaluation of defibrillation threshold is a standard of care during implantation of implantable cardioverter defibrillator. High defibrillation thresholds are often encountered and pose a challenge to electrophysiologists to improve the defibrillation threshold. We describe a case series where defibrillation thresholds were improved after implanting a defibrillation lead in the azygos vein.

  15. Implantable cardioverter defibrillator implantation without using fluoroscopy in a pregnant patient.

    Science.gov (United States)

    Tuzcu, Volkan; Kilinc, Orhan U

    2012-09-01

    Conventional lead implantation requires fluoroscopic guidance. This may be problematic in certain patient groups such as pregnant patients. We report a case of an implantable cardioverter defibrillator implantation without fluoroscopy in a pregnant patient. ©2011, The Authors. Journal compilation ©2012 Wiley Periodicals, Inc.

  16. Primary prevention of peri-implantitis: managing peri-implant mucositis.

    Science.gov (United States)

    Jepsen, Søren; Berglundh, Tord; Genco, Robert; Aass, Anne Merete; Demirel, Korkud; Derks, Jan; Figuero, Elena; Giovannoli, Jean Louis; Goldstein, Moshe; Lambert, France; Ortiz-Vigon, Alberto; Polyzois, Ioannis; Salvi, Giovanni E; Schwarz, Frank; Serino, Giovanni; Tomasi, Cristiano; Zitzmann, Nicola U

    2015-04-01

    Over the past decades, the placement of dental implants has become a routine procedure in the oral rehabilitation of fully and partially edentulous patients. However, the number of patients/implants affected by peri-implant diseases is increasing. As there are--in contrast to periodontitis--at present no established and predictable concepts for the treatment of peri-implantitis, primary prevention is of key importance. The management of peri-implant mucositis is considered as a preventive measure for the onset of peri-implantitis. Therefore, the remit of this working group was to assess the prevalence of peri-implant diseases, as well as risks for peri-implant mucositis and to evaluate measures for the management of peri-implant mucositis. Discussions were informed by four systematic reviews on the current epidemiology of peri-implant diseases, on potential risks contributing to the development of peri-implant mucositis, and on the effect of patient and of professionally administered measures to manage peri-implant mucositis. This consensus report is based on the outcomes of these systematic reviews and on the expert opinion of the participants. Key findings included: (i) meta-analysis estimated a weighted mean prevalence for peri-implant mucositis of 43% (CI: 32-54%) and for peri-implantitis of 22% (CI: 14-30%); (ii) bleeding on probing is considered as key clinical measure to distinguish between peri-implant health and disease; (iii) lack of regular supportive therapy in patients with peri-implant mucositis was associated with increased risk for onset of peri-implantitis; (iv) whereas plaque accumulation has been established as aetiological factor, smoking was identified as modifiable patient-related and excess cement as local risk indicator for the development of peri-implant mucositis; (v) patient-administered mechanical plaque control (with manual or powered toothbrushes) has been shown to be an effective preventive measure; (vi) professional intervention

  17. The Biolink Implantable Telemetry System

    Science.gov (United States)

    Betancourt-Zamora, Rafael J.

    1999-01-01

    Most biotelemetry applications deal with the moderated data rates of biological signals. Few people have studied the problem of transcutaneous data transmission at the rates required by NASA's Life Sciences-Advanced BioTelemetry System (LS-ABTS). Implanted telemetry eliminate the problems associated with wire breaking the skin, and permits experiments with awake and unrestrained subjects. Our goal is to build a low-power 174-216MHz Radio Frequency (RF) transmitter suitable for short range biosensor and implantable use. The BioLink Implantable Telemetry System (BITS) is composed of three major units: an Analog Data Module (ADM), a Telemetry Transmitter Module (TTM), and a Command Receiver Module (CRM). BioLink incorporates novel low-power techniques to implement a monolithic digital RF transmitter operating at 100kbps, using quadrature phase shift keying (QPSK) modulation in the 174-216MHz ISM band. As the ADM will be specific for each application, we focused on solving the problems associated with a monolithic implementation of the TTM and CRM, and this is the emphasis of this report. A system architecture based on a Frequency-Locked Loop (FLL) Frequency Synthesizer is presented, and a novel differential frequency that eliminates the need for a frequency divider is also shown. A self sizing phase modulation scheme suitable for low power implementation was also developed. A full system-level simulation of the FLL was performed and loop filter parameters were determined. The implantable antenna has been designed, simulated and constructed. An implant package compatible with the ABTS requirements is also being proposed. Extensive work performed at 200MHz in 0.5um complementary metal oxide semiconductors (CMOS) showed the feasibility of integrating the RF transmitter circuits in a single chip. The Hajimiri phase noise model was used to optimize the Voltage Controlled Oscillator (VCO) for minimum power consumption. Two test chips were fabricated in a 0.5pm, 3V CMOS

  18. Die Rechtsstellung von Ausländern nach staatlichem Recht und Völkerrecht. Herausgegeben von Jochen Abr. Frowein und Torsten Stein. (Beiträge zum ausländischen öffentlichen Recht und Völkerrecht, Band 94) / Henn-Jüri Uibopuu

    Index Scriptorium Estoniae

    Uibopuu, Henn-Jüri, 1929-2012

    1988-01-01

    Raamatuarvustus: Die Rechtsstellung von Ausländern nach staatlichem Recht und Völkerrecht = The legal position of aliens in national and international law = Le régime juridique des étrangers en droit national et international / Max-Planck-Institut für ausländisches öffentliches Recht und Völkerrecht ; herausgegeben von Jochen A. Frowein, Torsten Stein. Berlin [etc.] : Springer, 1987

  19. Osteogenesis and Morphology of the Peri-Implant Bone Facing Dental Implants

    Directory of Open Access Journals (Sweden)

    Marco Franchi

    2004-01-01

    Full Text Available This study investigated the influence of different implant surfaces on peri-implant osteogenesis and implant face morphology of peri-implant tissues during the early (2 weeks and complete healing period (3 months. Thirty endosseous titanium implants (conic screws with differently treated surfaces (smooth titanium = SS, titanium plasma sprayed = TPS, sand-blasted zirconium oxide = Zr-SLA were implanted in femur and tibiae diaphyses of two mongrel sheep. Histological sections of the implants and surrounding tissues obtained by sawing and grinding techniques were observed under light microscopy (LM. The peri-implant tissues of other samples were mechanically detached from the corresponding implants to be processed for SEM observation. Two weeks after implantation, we observed osteogenesis (new bone trabeculae around all implant surfaces only where a gap was present at the host bone-metal interface. No evident bone deposition was detectable where threads of the screws were in direct contact with the compact host bone. Distance osteogenesis predominated in SS implants, while around rough surfaces (TPS and Zr-SLA, both distance and contact osteogenesis were present. At SEM analysis 2 weeks after implantation, the implant face of SS peri-implant tissue showed few, thin, newly formed, bone trabeculae immersed in large, loose, marrow tissue with blood vessels. Around the TPS screws, the implant face of the peri-implant tissue was rather irregular because of the rougher metal surface. Zr-SLA screws showed more numerous, newly formed bone trabeculae crossing marrow spaces and also needle-like crystals in bone nodules indicating an active mineralising process. After 3 months, all the screws appeared osseointegrated, being almost completely covered by a compact, mature, newly formed bone. However, some marrow spaces rich in blood vessels and undifferentiated cells were in contact with the metal surface. By SEM analysis, the implant face of the peri-implant

  20. Optimal Implantable Cardioverter Defibrillator Programming.

    Science.gov (United States)

    Shah, Bindi K

    Optimal programming of implantable cardioverter defibrillators (ICDs) is essential to appropriately treat ventricular tachyarrhythmias and to avoid unnecessary and inappropriate shocks. There have been a series of large clinical trials evaluating tailored programming of ICDs. We reviewed the clinical trials evaluating ICD therapies and detection, and the consensus statement on ICD programming. In doing so, we found that prolonged ICD detection times, higher rate cutoffs, and antitachycardia pacing (ATP) programming decreases inappropriate and painful therapies in a primary prevention population. The use of supraventricular tachyarrhythmia discriminators can also decrease inappropriate shocks. Tailored ICD programming using the knowledge gained from recent ICD trials can decrease inappropriate and unnecessary ICD therapies and decrease mortality.

  1. Concepts for designing and fabricating metal implant frameworks for hybrid implant prostheses.

    Science.gov (United States)

    Drago, Carl; Howell, Kent

    2012-07-01

    Edentulous patients have reported difficulties in managing complete dentures; they have also reported functional concerns and higher expectations regarding complete dentures than the dentists who have treated them. Some of the objectives of definitive fixed implant prosthodontic care include predictable, long-term prostheses, improved function, and maintenance of alveolar bone. One of the keys to long-term clinical success is the design and fabrication of metal frameworks that support implant prostheses. Multiple, diverse methods have been reported regarding framework design in implant prosthodontics. Original designs were developed empirically, without the benefit of laboratory testing. Prosthetic complications reported after occlusal loading included screw loosening, screw fracture, prosthesis fracture, crestal bone loss around implants, and implant loss. Numerous authors promoted accurately fitting frameworks; however, it has been noted that metal frameworks do not fit accurately. Passively fitting metal implant frameworks and implants have not been realized. Biologic consequences of ill-fitting frameworks were not well understood. Basic engineering principles were then incorporated into implant framework designs; however, laboratory testing was lacking. It has been reported that I- and L-beam designs were the best clinical option. With the advent of CAD/CAM protocols, milled titanium frameworks became quite popular in implant prosthodontics. The purpose of this article is to discuss current and past literature regarding implant-retained frameworks for full-arch, hybrid restorations. Benefits, limitations, and complications associated with this type of prosthesis will be reviewed. This discussion will include the relative inaccuracy of casting/implant fit and improved accuracy noted with CAD/CAM framework/implant fit; cantilever extensions relative to the A/P implant spread; and mechanical properties associated with implant frameworks including I- and L

  2. Implant decontamination with phosphoric acid during surgical peri-implantitis treatment: a RCT.

    Science.gov (United States)

    Hentenaar, Diederik F M; De Waal, Yvonne C M; Strooker, Hans; Meijer, Henny J A; Van Winkelhoff, Arie-Jan; Raghoebar, Gerry M

    2017-12-01

    Peri-implantitis is known as an infectious disease that affects the peri-implant soft and hard tissue. Today, scientific literature provides very little evidence for an effective intervention protocol for treatment of peri-implantitis. The aim of the present randomized controlled trial is to evaluate the microbiological and clinical effectiveness of phosphoric acid as a decontaminating agent of the implant surface during surgical peri-implantitis treatment. Peri-implantitis lesions were treated with resective surgical treatment aimed at peri-implant granulation tissue removal, bone recontouring, and pocket elimination. Fifty-three implant surfaces in 28 patients were mechanically cleaned and treated with either 35% phosphoric etching gel (test group) or sterile saline (control group). Microbiological samples were obtained during surgery; clinical parameters were recorded at baseline and at 3 months after treatment. Data were analyzed using multi-variable linear regression analysis and multilevel statistics. Significant immediate reductions in total anaerobic bacterial counts on the implant surface were found in both groups. Immediate reduction was greater when phosphoric acid was used. The difference in log-transformed mean anaerobic counts between both procedures was not statistical significant (p = 0.108), but there were significantly less culture-positive implants after the decontamination procedure in the phosphoric acid group (p = 0.042). At 3 months post-surgery, 75% of the implants in the control group and 63.3% of the implants in the test group showed disease resolution. However, no significant differences in clinical and microbiological outcomes between both groups were found. The application of 35% phosphoric acid after mechanical debridement is superior to mechanical debridement combined with sterile saline rinsing for decontamination of the implant surface during surgical peri-implantitis treatment. However, phosphoric acid as implant surface

  3. Coated vs uncoated implants: bone defect configurations after progressive peri-implantitis in dogs.

    Science.gov (United States)

    Madi, Marwa; Zakaria, Osama; Kasugai, Shohei

    2014-12-01

    In this study, hydroxyapatite coated vs uncoated implants were used to evaluate the type and dimensions of bone defects after progressive peri-implantitis in dogs. Thirty-two dental implants with 4 different surfaces-machined (M), sandblasted acid-etched (SA), 1-μm thin sputter hydroxyapatite (HA)-coated (S), and plasma-sprayed HA-coated (P)-were inserted into the mandibles of 4 beagle dogs after extracting all mandibular premolars. Experimental peri-implantitis was induced after 3 months using ligature to allow for plaque accumulation. After 4 months, ligatures were removed and plaque accumulation continued for 5 months (progression period). The open flap surgery demonstrated 3 patterns of peri-implantitis bone defect: (1) Class I defect: represented as circumferential intra-alveolar bone loss; (2) Class II defect: circumferential intra-alveolar defect with supra-alveolar bone loss exposing the implant surface; and (3) Class III defect: represented as circumferential intra-alveolar defect with supra-alveolar bone loss and buccal dehiscence. Class I was the most frequent (62.5%) defect pattern around implant types M, SA, and S; while implant type-P showed a recurring majority of Class II (62.5%). Comparison among the 4 implant groups revealed a significant defect width (DW) in implant type-P relative to other types (P 0.05). We concluded that the shape and size of peri-implantitis bone defects were influenced by the type and thickness of the HA coat together with the quantity of the available peri-implant bone. Plasma-sprayed HA-coated implants showed larger peri-implant defects than did thin sputter HA-coated implants.

  4. A Retrospective Analysis of Dental Implants Replacing Failed Implants in Grafted Maxillary Sinus: A Case Series.

    Science.gov (United States)

    Manor, Yifat; Chaushu, Gavriel; Lorean, Adi; Mijiritzky, Eithan

    2015-01-01

    To evaluate the survival rate of dental implants replacing failed implants in grafted maxillary sinuses using the lateral approach vs nongrafted posterior maxillae. A retrospective analysis was conducted to study the survival of secondary dental implants inserted in the posterior maxilla in previously failed implant sites between the years 2000 and 2010. The study group consisted of patients who had also undergone maxillary sinus augmentation, and the control group consisted of patients in whom implants in the posterior maxilla had failed. Clinical and demographic data were analyzed using a structured form. Seventy-five patients with a total of 75 replaced implants were included in the study. The study group comprised 40 patients and the control group, 35 patients. None of the replaced implants in the study group failed, resulting in an overall survival of 100%; three replaced implants in the control group failed (92% survival). The main reason for the primary implant removal was lack of osseointegration (35 [87.5%] of 40 study group implants and 23 [65.7%] of 35 control group implants [P = .027]). The difference between the groups with regard to the timing of primary implant failure was statistically significant. The study group had more early failures of the primary implant than did the control group (77% vs 62%; P = .038). Dental implants replaced in the posterior maxilla had a high survival rate. A higher rate of survival was found in augmented maxillary sinus sites. Within the limits of the present study, it can be concluded that previous implant failures in the grafted maxillary sinus should not discourage practitioners from a second attempt.

  5. Spiral CT angiography for demonstrating cerebral aneurysms before and after treatment with titanium clips; Spiral-CT-Angiographie zur Darstellung von zerebralen Aneurysmen vor und nach Versorgung mit Titan-Clips

    Energy Technology Data Exchange (ETDEWEB)

    Becker, C.; Volkmar, C.; Weber, J.; Fink, U.; Holzknecht, N.; Reiser, M. [Institut fuer Radiologische Diagnostik, Klinikum Grosshadern, Universitaet Muenchen (Germany); Yousry, T. [Abteilung fuer Neuroradiologie, Institut fuer Radiologische Diagnostik, Klinikum Grosshadern, Universitaet Muenchen (Germany); Steiger, H.J. [Klinik fuer Neurochirurgie, Klinikum Grosshadern, Universitaet Muenchen (Germany)

    1997-11-01

    Purpose: To determine the suitability of spiral CT angiography (SCTA) in patients with intracerebral titanium aneurysm clips. Material and Method: The section parameters were optimised using a phantom. 16 patients were examined preoperatively and 18 following treatment of aneurysms with clips. Results: The resolution, sensitivity and specificity for demonstrating cerebral aneurysms measuring{>=}3 mm was 91.3% and 75% respectively. In 15 patients with intracerebral clips there were no or only minor artefacts; three examinations were of no value because of major metal artefacts. Amongst six aneurysms demonstrated angiographically, two, which measured more than 3 mm, could be shown by SCTA. Conclusion: SCTA was able to demonstrate intracerebral aneurysms measuring{>=}3 mm. Titanium clips did not usually affect image quality significantly. (orig.) [Deutsch] Ziel: Unsere Untersuchungen sollten die Eignung der Spiral-CT-Angiographie (SCTA) fuer Patienten mit intrazerebralen Titan-Aneurysma-Clips pruefen. Material und Methode: An einem Phantom wurden die Schichtparameter optimiert. 16 Patienten wurden praeopertiv und 18 nach operativer Clippung eines Aneurysmas untersucht. Ergebnisse: Die untere Nachweisgrenze, Sensitivitaet und Spezifitaet fuer den Nachweis von zerebralen Aneurysmen lag bei{>=}3 mm, 91,3% und 75%. Bei Patienten mit intrazerebralen Clips wiesen 15 Untersuchungen keine oder geringe Artefakte auf, drei Untersuchungen konnten wegen ausgepraegter Metallartefakte nicht ausgewertet werden. Von den 6 angiographisch nachweisbaren Restaneurysmen konnten zwei mittels SCTA dargestellt werden, deren Durchmesser ueber 3 mm lag. Schlussfolgerung: Mit der SCTA koennen intrazerebrale Aneurysmen und Restaneurysmen{>=}3 mm nachgewiesen werden. Titanclips beeintraechtigen dabei die Bildqualitaet meist nicht nachhaltig. (orig.)

  6. Urban Image Construction in Macau in the First Decade after the “Handover”, 1999-2008 Zur Konstruktion des Stadtbildes von Macau im ersten Jahrzehnt nach der "Übergabe" (1999-2008

    Directory of Open Access Journals (Sweden)

    Hendrik Tieben

    2009-04-01

    Full Text Available This paper describes the transformation of Macau’s urban image in the first decade after the “handover” of the Portuguese enclave to the People’s Republic of China (PRC. In the pre-handover years and the first years of the newly established Macau Special Administrative Region (MSAR, urban interventions created an image thought to assure the continuity of Macau’s Eurasian identity along with future financial stability. In 2002, with the governmental decision not to renew the local gambling monopoly, Macau’s urban image was radically transformed. The liberalization of the gambling industry after Macau’s return to the PRC was combined with the deregulation of building heights, developer-friendly land sales, a growing number of migrant workers, and the liberalization of travel restrictions for mainland visitors. These deregulations were based on decisions by the MSAR and the PRC governments, respectively, and led to the exponential growth of Macau’s GDP within only six years. This paper describes how, through these decisions, Macau’s urban image and space have been transformed. Der Beitrag beschreibt die Transformation des Stadtbildes von Macau nach der "Übergabe" der portugiesischen Enklave an die Volksrepublik China.

  7. CLINICAL CONSIDERATIONS OF DENTAL IMPLANT SYSTEM IN IMMEDIATE LOADING IMPLANT CASES

    Directory of Open Access Journals (Sweden)

    Carolina Damayanti Marpaung

    2015-06-01

    Full Text Available Immediate loading of dental implant has been researched intensively in the development of Branemark’s early concept of 2 stages implant placement. This was embarked from both patients and practiitioner’s convenience towards a simpler protocol and shorter time frame. Many recent researchers later found that micromotions derived from occlusal loading for a certain degree, instead of resulting a fibrous tissue encapsulation, can enhance the osseointegration process. Dental Implant system enhancement towards maximizing the primary stability held a key factor in Branemark’s concept development. Surgical protocol and implant design was found to give a significant contribution to the prognosis of immediate-loading implants.

  8. Microbiologic and Clinical Findings of Implants in Healthy Condition and with Peri-Implantitis.

    Science.gov (United States)

    Canullo, Luigi; Peñarrocha-Oltra, David; Covani, Ugo; Rossetti, Paulo Henrique Orlato

    2015-01-01

    To compare implants in healthy conditions and implants with peri-implantitis with regard to their clinical parameters and the microbiologic composition at the peri-implant sulcus, inside the implant connection, and the gingival sulcus of neighboring teeth. A cross-sectional study was performed including consecutive patients with implants in healthy conditions and with peri-implantitis. Clinical parameters for which patients were screened included bleeding on probing, pocket depth, and plaque index at six sites. Samples for microbiologic analysis were obtained from three locations: the peri-implant sulcus, inside the implant connection, and the gingival sulcus of neighboring teeth. Quantitative real-time polymerase chain reaction (PCR) was carried out for total counts of 10 microorganisms: Aggregatibacter actinomycetemcomitans, Porphyromona gingivalis, Tanerella forsythia, Tanerella denticola, Prevotela intermedia, Peptostreptococcus micros, Fusobacterium nucleatum, Campylobacter rectus, Eikenella corrodens, and Candida albicans. The response variables were the percentage of positive sites and total bacterial counts. One hundred twenty-two implants in 57 patients were analyzed in the healthy group and 113 implants in 53 patients in the peri-implantitis group. Differences between the groups were statistically significant for bruxism, probing pocket depth, bleeding on probing, and radiographic bone level. Orange complex species (P intermedia, P micros, F nucleatum) were the most prevalent in the three types of sites for both groups, and prevalence values were higher in the peri-implantitis group. Differences in prevalence between groups were more marked inside the connection than in the peri-implant sulcus. Absolute loads of most microbes and total bacterial counts were higher for the peri-implantitis group in the three locations. Again, differences were bigger inside the connection than at the peri-implant sulcus. Significant interactions were found for prevalence

  9. Implantation of a Resynchronization Implantable Cardioverter Defibrillator in a Patient with Persistent Left Superior Vena Cava

    Directory of Open Access Journals (Sweden)

    Dante Antonelli

    2007-10-01

    Full Text Available Implantation of resynchronization implantable cardioverter defibrillator was performed in a patient with persistent left superior vena cava. A dual coil defibrillation lead was inserted in the right ventricle apex via a small innominate vein. Left ventricular and atrial leads were implanted through persistent left superior vena cava. Left ventricular lead was easily implanted into the postero lateral vein. Pacing thresholds and sensing values were excellent and remained stable at 18 months follow-up. Presence of persistent left superior vena cava generally makes transvenous lead implantation difficult. However when a favorable coronary sinus anatomy is also present, it may facilitate left ventricular lead positioning in the coronary sinus branches.

  10. Assessment of interleukin-1beta and interleukin-6 in the crevicular fluid around healthy implants, implants with peri-implantitis, and healthy teeth: a cross-sectional study.

    Science.gov (United States)

    Yaghobee, Siamak; Khorsand, Afshin; Rasouli Ghohroudi, Amir Alireza; Sanjari, Khashayar; Kadkhodazadeh, Mahdi

    2014-10-01

    This study aimed to assess and compare the levels of interleukin-1beta (IL-1β) and interleukin-6 (IL-6) in the crevicular fluid around healthy implants, implants with peri-implantitis, and healthy teeth. This study evaluated 16 dental implants in 8 patients (4 males and 4 females). These patients had at least one healthy implant and one implant with peri-implantitis next to healthy teeth. The crevicular fluid was collected using absorbent cones and transferred to the laboratory. Specimens were evaluated by ELISA for interleukin levels. Data were analyzed using repeated measures ANOVA and Bonferroni tests (Pimplants with peri-implantitis were significantly higher than around healthy implants (P=0.002); the latter was significantly higher than around healthy teeth (P=0.015). A significant difference was found in the level of IL-6 in the crevicular fluid around implants with peri-implantitis and healthy implants (P=0.049) and also between implants with peri-implantitis and healthy teeth (Pimplants with peri-implantitis, healthy implants, and healthy teeth. More studies with larger sample sizes in different populations are necessary.

  11. Comparison of peri-implant bone formation around injection-molded and machined surface zirconia implants in rabbit tibiae

    Science.gov (United States)

    Kim, Hong-Kyun; Woo, Kyung mi; Shon, Won-Jun; Ahn, Jin-Soo; Cha, Seunghee; Park, Young-Seok

    2017-01-01

    The aim of this study was to compare osseointegration and surface characteristics of zirconia implants made by the powder injection molding (PIM) technique and made by the conventional milling procedure in rabbit tibiae. Surface characteristics of 2 types of implant were evaluated. Sixteeen rabbits received 2 types of external hex implants with similar geometry, machined zirconia implants and PIM zirconia implants, in the tibiae. Removal torque tests and histomorphometric analyses were performed. The roughness of PIM zirconia implants was higher than that of machined zirconia implants. The PIM zirconia implants exhibited significantly higher bone-implant contact and removal torque values than the machined zirconia implants (P zirconia implant is promising, and PIM, using the roughened mold etching technique, can produce substantially rough surfaces on zirconia implants. PMID:26235717

  12. PHOSPHATED, ACID-ETCHED IMPLANTS DECREASE MINERAL APPOSITION RATES NEAR IMPLANTS IN CANINES

    Science.gov (United States)

    Foley, Christine Hyon; Kerns, David G.; Hallmon, William W.; Rivera-Hidalgo, Francisco; Nelson, Carl J.; Spears, Robert; Dechow, Paul C.; Opperman, Lynne A.

    2010-01-01

    Purpose: This study evaluated the effects of phosphate-coated titanium on mineral apposition rate (MAR) and new bone-to-implant contact (BIC) in canines. Materials and Methods: 2.2 mm × 4 mm electrolytically phosphated or non-phosphated titanium implants with acid-etched surfaces were placed in 48 mandibular sites in 6 foxhounds. Tetracycline and calcein dyes were administered 1 week after implant placement and 1 week before sacrifice. At twelve weeks following implant healing, animals were sacrificed. MAR and BIC were evaluated using fluorescence microscopy. Light microscopic and histological evaluation was performed on undecalcified sections. Results: Microscopic evaluation showed the presence of healthy osteoblasts lining bone surfaces near implants. Similar bone-to-implant contact was observed in phosphated and non-phosphated titanium implant sites. MAR was significantly higher near non-phosphated titanium implant surfaces than the phosphated titanium samples. No significant differences were found between dogs or implant sites. Discussion and Conclusion: Acid-etched only implants showed significantly higher mineral apposition rates compared to acid-etched, phosphate-coated implants. PMID:20369085

  13. Influence of prosthesis design and implantation technique on implant stresses after cementless revision THR

    Directory of Open Access Journals (Sweden)

    Duda Georg N

    2011-05-01

    Full Text Available Abstract Background Femoral offset influences the forces at the hip and the implant stresses after revision THR. For extended bone defects, these forces may cause considerable bending moments within the implant, possibly leading to implant failure. This study investigates the influences of femoral anteversion and offset on stresses in the Wagner SL revision stem implant under varying extents of bone defect conditions. Methods Wagner SL revision stems with standard (34 mm and increased offset (44 mm were virtually implanted in a model femur with bone defects of variable extent (Paprosky I to IIIb. Variations in surgical technique were simulated by implanting the stems each at 4° or 14° of anteversion. Muscle and joint contact forces were applied to the reconstruction and implant stresses were determined using finite element analyses. Results Whilst increasing the implant's offset by 10 mm led to increased implant stresses (16.7% in peak tensile stresses, altering anteversion played a lesser role (5%. Generally, larger stresses were observed with reduced bone support: implant stresses increased by as much as 59% for a type IIIb defect. With increased offset, the maximum tensile stress was 225 MPa. Conclusion Although increased stresses were observed within the stem with larger offset and increased anteversion, these findings indicate that restoration of offset, key to restoring joint function, is unlikely to result in excessive implant stresses under routine activities if appropriate fixation can be achieved.

  14. Cochlear Implant Using Neural Prosthetics

    Science.gov (United States)

    Gupta, Shweta; Singh, Shashi kumar; Dubey, Pratik Kumar

    2012-10-01

    This research is based on neural prosthetic device. The oldest and most widely used of these electrical, and often computerized, devices is the cochlear implant, which has provided hearing to thousands of congenitally deaf people in this country. Recently, the use of the cochlear implant is expanding to the elderly, who frequently suffer major hearing loss. More cutting edge are artificial retinas, which are helping dozens of blind people see, and ìsmartî artificial arms and legs that amputees can maneuver by thoughts alone, and that feel more like real limbs.Research, which curiosity led to explore frog legs dancing during thunderstorms, a snail shapedorgan in the inner ear, and how various eye cells react to light, have fostered an understanding of how to ìtalkî to the nervous system. That understanding combined with the miniaturization of electronics and enhanced computer processing has enabled prosthetic devices that often can bridge the gap in nerve signaling that is caused by disease or injury.

  15. Diamond Films for Implantable Electrodes

    Directory of Open Access Journals (Sweden)

    Petra Henychová

    2012-01-01

    Full Text Available Diamond is a promising material for implantable electrodes due to its unique properties. The aim of this work is to investigate the growth of boron-doped nanocrystalline diamond (B-NCD films by plasma-enhanced microwave chemical vapor deposition at various temperatures, and to propose optimal diamond growth conditions for implantable electrodes. We have investigated the temperature dependence (450 °C–820 °C of boron incorporation, surface morphology and growth rate on a polished quartz plate. Surface morphology and thickness were examined by atomic force microscopy (AFM.The quality of the films in terms of diamond and non-diamond phase of carbon was investigated by Raman spectroscopy. AFM imaging showed that the size of the grains was determined mainly by the thickness of the films, and varied from an average size of 40 nm in the lowest temperature sample to an average size of 150 nm in the sample prepared at the highest temperature. The surface roughness of the measured samples varied between 10 (495 °C and 25 nm (800 °C. The growth rate of the sample increased with temperature. We found that the level of boron doping was strongly dependent on temperature during deposition. An optimal B-NCD sample was prepared at 595 °C.

  16. Bioactivity of plasma implanted biomaterials

    Science.gov (United States)

    Chu, Paul K.

    2006-01-01

    Plasma immersion ion implantation and deposition (PIII&D) is an effective technique to enhance the surface bioactivity of materials. In this paper, recent progress made in our laboratory on plasma surface modification of biomedical materials is described. NiTi alloys have unique super-elastic and shape memory properties and are suitable for orthopedic implants but the leaching of toxic Ni may pose health hazards in humans. We have recently investigated the use of acetylene, oxygen and nitrogen PIII&D to prevent out-diffusion of nickel and good results have been obtained. Silicon is the most important material in the microelectronics industry but its surface biocompatibility has not been investigated in details. We have recently performed hydrogen PIII into silicon to improve the surface bioactivity and observed biomimetic growth of apatite on the surface in simulated body fluids. Diamond-like carbon (DLC) is widely used in the industry due to its excellent mechanical properties and chemical inertness and by incorporation of elements such as nitrogen and phosphorus, the surface blood compatibility can be improved. The properties as well as in vitro biological test results are discussed in this article.

  17. Automated design of customized implants

    Directory of Open Access Journals (Sweden)

    Vicente Chulvi

    2013-01-01

    Full Text Available Este artículo muestra un modelo que se postula como capaz para el diseño de un implante craneal personalizado directamente desde el proceso de toma de imágenes médica. La salida de este proceso de diseño se conseguirá en un formato capaz de ser reconocido por el sistema de manufactura. El sistema propuesto se ha creado a partir de la unión de dos prototipos informáticos desarrollados durante la presente investigación, y a través del estudio de las tecnologías relacionadas o circundantes. El núcleo del modelo en la tecnología basada en el conocimiento (KBS, que debe permitir de almacenar y gestionar datos médicos y de diseño para poder aplicar dichos conocimientos durante el proceso de diseño del implante. El objeto de este proyecto es el de obtener una herramienta para mejorar el proceso de diseño, la biocompatibilidad con el paciente y reducir los costes finales, y que pueda ser operado sin necesidad del conocimiento completo de todas sus fases por el usuario.

  18. Biofilm and dental implant: The microbial link

    Science.gov (United States)

    Dhir, Sangeeta

    2013-01-01

    Mouth provides a congenial environment for the growth of the microorganisms as compared to any other part of the human body by exhibiting an ideal nonshedding surface. Dental plaque happens to be a diverse community of the microorganisms found on the tooth surface. Periodontal disease and the peri-implant disease are specific infections that are originating from these resident microbial species when the balance between the host and the microbial pathogenicity gets disrupted. This review discusses the biofilms in relation to the peri-implant region, factors affecting its presence, and the associated treatment to manage this complex microbial colony. Search Methodology: Electronic search of the medline was done with the search words: Implants and biofilms/dental biofilm formation/microbiology at implant abutment interface/surface free energy/roughness and implant, periimplantitis/local drug delivery and dental implant. Hand search across the journals – clinical oral implant research, implant dentistry, journal of dental research, international journal of oral implantology, journal of prosthetic dentistry, perioodntology 2000, journal of periodontology were performed. The articles included in the review comprised of in vivo studies, in vivo (animal and human) studies, abstracts, review articles. PMID:23633764

  19. Dental implants in the medically compromised patient

    National Research Council Canada - National Science Library

    Diz, Pedro; Scully, Crispian; Sanz, Mariano

    2013-01-01

    .... The degree of systemic disease-control may be far more important that the nature of the disorder itself, and individualized medical control should be established prior to implant therapy, since in many of these patients the quality of life and functional benefits from dental implants may outweigh any risks.

  20. Dental Implants in Patients with Sjogren's Syndrome

    NARCIS (Netherlands)

    Korfage, Anke; Raghoebar, Gerry M; Arends, Suzanne; Meiners, Petra M; Visser, Anita; Kroese, Frans Gm; Bootsma, Hendrika; Vissink, Arjan

    2016-01-01

    Background: Limited evidence is available for applying dental implants in Sjogren's syndrome (SS) patients. Purpose: This study aims to retrospectively assess clinical outcome of implant therapy in a cohort of well-classified patients with SS. Materials and Methods: All SS patients attending the

  1. Quality assessment of pacemaker implantations in Denmark

    DEFF Research Database (Denmark)

    Møller, M; Arnsbo, P; Asklund, Mogens

    2002-01-01

    AIMS: Quality assessment of therapeutic procedures is essential to insure a cost-effective health care system. Pacemaker implantation is a common procedure with more than 500,000 implantations world-wide per year, but the general complication rate is not well described. We studied procedure related...

  2. Biofilm and dental implant: The microbial link

    Directory of Open Access Journals (Sweden)

    Sangeeta Dhir

    2013-01-01

    Full Text Available Mouth provides a congenial environment for the growth of the microorganisms as compared to any other part of the human body by exhibiting an ideal nonshedding surface. Dental plaque happens to be a diverse community of the microorganisms found on the tooth surface. Periodontal disease and the peri-implant disease are specific infections that are originating from these resident microbial species when the balance between the host and the microbial pathogenicity gets disrupted. This review discusses the biofilms in relation to the peri-implant region, factors affecting its presence, and the associated treatment to manage this complex microbial colony. Search Methodology: Electronic search of the medline was done with the search words: Implants and biofilms/dental biofilm formation/microbiology at implant abutment interface/surface free energy/roughness and implant, periimplantitis/local drug delivery and dental implant. Hand search across the journals - clinical oral implant research, implant dentistry, journal of dental research, international journal of oral implantology, journal of prosthetic dentistry, perioodntology 2000, journal of periodontology were performed. The articles included in the review comprised of in vivo studies, in vivo (animal and human studies, abstracts, review articles.

  3. Internationalisation et nouvelles implantations des firmes ...

    African Journals Online (AJOL)

    ... modèle seront confrontées aux analyses critiques de ses notions de base. Enfin, nous discuterons de son application à l'analyse de l'implantation des firmes multinationales ainsi que des nombreuses extensions possibles du modèle. MOTS CLES: Internationalisation, implantation, firme multinationale, modèle d'Uppsala ...

  4. Surgical factors influencing mesiodistal implant angulation.

    Science.gov (United States)

    Payer, Michael; Kirmeier, Robert; Jakse, Norbert; Pertl, Christof; Wegscheider, Walther; Lorenzoni, Martin

    2008-03-01

    The aim of this experimental study was to identify relevant surgical parameters influencing the mesiodistal angular deviation of dental implants. Pilot drillings of 2 mm diameter were performed in bovine ribs with a parallelometer. The subsequent preparation of the implant socket was performed freehand. Utilizing six different implant systems, at least 80 drillings per system of different diameters were performed. The pilot drillings were marked with 2 mm steel pins and cephalometric radiographs were taken. The mesiodistal angle between the longitudinal implant axis and the marked pilot drillings was measured and evaluated by a blinded investigator. To evaluate the influence of the surgeons' experience, their drillings were compared with those of a group of unexperienced surgeons. Additionally, the influence of drilling speed and size of bur steps on drilling accuracy were evaluated. The difference between the lowest value of 0.91 degrees of mesiodistal angular deviation found for 3i implants and the highest of 1.36 degrees for Ankylos implants was of low statistical significance (P=0.065). Drillings of experienced surgeons showed less deviation compared with those of a beginners group (P<0.0001). Higher deviations were measured when a bur size was skipped. Drillings performed at high speed showed significantly higher deviations than those with fewer rewinds per minute. In order to achieve precise implant angulation, all bur diameters available should be used. Utilizing low drilling speeds results in less mesiodistal deviation. The surgeon's experience seems to be the most relevant factor in precise implant placement.

  5. RAPID MANUFACTURING SYSTEM OF ORTHOPEDIC IMPLANTS.

    Science.gov (United States)

    Relvas, Carlos; Reis, Joana; Potes, José Alberto Caeiro; Fonseca, Fernando Manuel Ferreira; Simões, José Antonio Oliveira

    2009-01-01

    This study, aimed the development of a methodology for rapid manufacture of orthopedic implants simultaneously with the surgical intervention, considering two potential applications in the fields of orthopedics: the manufacture of anatomically adapted implants and implants for bone loss replacement. This work innovation consists on the capitation of the in situ geometry of the implant by direct capture of the shape using an elastomeric material (polyvinylsiloxane) which allows fine detail and great accuracy of the geometry. After scanning the elastomeric specimen, the implant is obtained by machining using a CNC milling machine programmed with a dedicated CAD/CAM system. After sterilization, the implant is able to be placed on the patient. The concept was developed using low cost technology and commercially available. The system has been tested in an in vivo hip arthroplasty performed on a sheep. The time increase of surgery was 80 minutes being 40 minutes the time of implant manufacturing. The system developed has been tested and the goals defined of the study achieved enabling the rapid manufacture of an implant in a time period compatible with the surgery time.

  6. Fundamentals and history of implant dentistry

    Directory of Open Access Journals (Sweden)

    Tamal Kanti Pal

    2015-01-01

    Full Text Available The practice of implant dentistry was not there a few decades ago It has its long historical retrospectives. The quest for rehabilitation of edentulous ridge has intrigued mankind since ancient times. The period from the time of Egyptian and Mayan civilizations to 1930s was unique when clinicians attempted to replace a missing tooth utilizing various materials. The spark of inquiry began from mid-1930s with the advent of an alloy named “vitallium;” attempts have been made to utilize this new material as an implant. Thereafter, in early 1950s, a good deal of fundamental and clinical research started taking place. These research data had given a boost to the tremendous growth of the practice of using dental implants made of vitallium that practically exploded to reach every general practitioner's clinic across the globe. Critical understanding of bone physiology, drilling protocol, implant design and surface texture, initial implant stability, single-stage implant surgery, and immediate loading of implants are the few factors based on which modern implant practice has become a predictable treatment modality for the replacement of missing teeth.

  7. Biofilm and dental implant: The microbial link.

    Science.gov (United States)

    Dhir, Sangeeta

    2013-01-01

    Mouth provides a congenial environment for the growth of the microorganisms as compared to any other part of the human body by exhibiting an ideal nonshedding surface. Dental plaque happens to be a diverse community of the microorganisms found on the tooth surface. Periodontal disease and the peri-implant disease are specific infections that are originating from these resident microbial species when the balance between the host and the microbial pathogenicity gets disrupted. This review discusses the biofilms in relation to the peri-implant region, factors affecting its presence, and the associated treatment to manage this complex microbial colony. Search Methodology: Electronic search of the medline was done with the search words: Implants and biofilms/dental biofilm formation/microbiology at implant abutment interface/surface free energy/roughness and implant, periimplantitis/local drug delivery and dental implant. Hand search across the journals - clinical oral implant research, implant dentistry, journal of dental research, international journal of oral implantology, journal of prosthetic dentistry, perioodntology 2000, journal of periodontology were performed. The articles included in the review comprised of in vivo studies, in vivo (animal and human) studies, abstracts, review articles.

  8. Rethinking antenna requirements for medical implant systems

    NARCIS (Netherlands)

    Scanlon, W.G.

    2011-01-01

    This paper examines the basic medical implant communication service (MICS) link budgets for both uplink and downlink, with some recent advances in implant antenna technology and most importantly, the nature of the in body to out of body propagation path. The paper also discusses the emerging network

  9. Polymeric implant of methylprednisolone for spinal injury ...

    African Journals Online (AJOL)

    Purpose: To improve the effectiveness and reduce the systemic side effects of methylprednisolone in traumatic spinal injuries, its polymeric implants were prepared using chitosan and sodium alginate as the biocompatible polymers. Methods: Implants of methylprednisolone sodium succinate (MPSS) were prepared by ...

  10. Current trends to measure implant stability

    Directory of Open Access Journals (Sweden)

    Vasanthi Swami

    2016-01-01

    Full Text Available Implant stability plays a critical role for successful osseointegration. Successful osseointegration is a prerequisite for functional dental implants. Continuous monitoring in an objective and qualitative manner is important to determine the status of implant stability. Implant stability is measured at two different stages: Primary and secondary. Primary stability comes from mechanical engagement with cortical bone. Secondary stability is developed from regeneration and remodeling of the bone and tissue around the implant after insertion and affected by the primary stability, bone formation and remodelling. The time of functional loading is dependent upon the implant stability. Historically the gold standard method to evaluate stability were microscopic or histologic analysis, radiographs, however due to invasiveness of these methods and related ethical issues various other methods have been proposed like cutting torque resistance, reverse torque analysis, model analysis etc. It is, therefore, of an utmost importance to be able to access implant stability at various time points and to project a long term prognosis for successful therapy. Therefore this review focuses on the currently available methods for evaluation of implant stability.

  11. Cochlear Implants: The Young People's Perspective

    Science.gov (United States)

    Wheeler, Alexandra; Archbold, Sue; Gregory, Susan; Skipp, Amy

    2007-01-01

    Cochlear implantation is a relatively new procedure, which has already had significant impact on the lives of many profoundly deaf children and adults, in providing useful hearing to those unable to benefit significantly from hearing aids. After 16 years of cochlear implantation in the United Kingdom, there is now a body of evidence covering a…

  12. Surgical Templates for Dental Implant Positioning; Current ...

    African Journals Online (AJOL)

    applicability of surgical templates used in the placement of dental implants. KEYWORDS: Dental implants, surgical templates, surgical procedure, stent. Access this .... ended up with the identification of basic three‑fabrication design concepts; (1) ... surgical guide on mounted diagnostic models of patient's mouth. He also ...

  13. Surgical Templates for Dental Implant Positioning; Current ...

    African Journals Online (AJOL)

    Dental implants have been used in a variety of different forms for many years. Since the mid‑20th century, there has been an increase in interest in the implant process for the replacement of missing teeth. Branemark was one of the initial pioneers who applied scientifically based research techniques to develop an ...

  14. Systemic Assessment of Patients Undergoing Dental Implant ...

    African Journals Online (AJOL)

    These days, dental implants are becoming routinely used as a treatment option for rehabilitation of lost teeth. Conventionally, it is only after the completion of bone healing that the dental implants are loaded into the bone. Bone healing time is approximately 3 months and. 6 months for the mandible and maxilla, respectively.

  15. Osseoperception in Dental Implants: A Systematic Review.

    Science.gov (United States)

    Mishra, Sunil Kumar; Chowdhary, Ramesh; Chrcanovic, Bruno Ramos; Brånemark, Per-Ingvar

    2016-04-01

    Replacement of lost teeth has significant functional and psychosocial effects. The capability of osseointegrated dental implants to transmit a certain amount of sensibility is still unclear. The phenomenon of developing a certain amount of tactile sensibility through osseointegrated dental implants is called osseoperception. The aim of this article is to evaluate the available literature to find osseoperception associated with dental implants. To identify suitable literature, an electronic search was performed using Medline and PubMed database. Articles published in English and articles whose abstract is available in English were included. The articles included in the review were based on osseoperception, tactile sensation, and neurophysiological mechanoreceptors in relation to dental implants. Articles on peri-implantitis and infection-related sensitivity were not included. Review articles without the original data were excluded, although references to potentially pertinent articles were noted for further follow-up. The phenomenon of osseoperception remains a matter of debate, so the search strategy mainly focused on articles on osseoperception and tactile sensibility of dental implants. This review presents the histological, neurophysiological, and psychophysical evidence of osseoperception and also the role of mechanoreceptors in osseoperception. The literature on osseoperception in dental implants is very scarce. The initial literature search resulted in 90 articles, of which 81 articles that fulfilled the inclusion criteria were included in this systematic review. Patients restored with implant-supported prostheses reported improved tactile and motor function when compared with patients wearing complete dentures. © 2016 by the American College of Prosthodontists.

  16. Systemic Assessment of Patients Undergoing Dental Implant ...

    African Journals Online (AJOL)

    Background: Procedure‑related and patient‑related factors influence the prognosis of dental implants to a major extent. Hence, we aimed to evaluate and analyze various systemic factors in patients receiving dental implants. Materials and Methods: Fifty‑one patients were included in the study, in which a total of 110 dental ...

  17. Libyan cochlear implant programme: achievements, difficulties, and ...

    African Journals Online (AJOL)

    Cochlear implantation has become established worldwide as a safe and effective method of auditory rehabilitation of selected severely and profound deaf children and adults. Over 100,000 patients have received cochlear implants worldwide with the paediatric population proving to be the main beneficiaries. The Libyan ...

  18. Implantable cardioverter defibrillator pocket infection caused by ...

    African Journals Online (AJOL)

    Like any other foreign bodies, implanted cardiac devices can become infected. Staphylococcus aureus and coagulase-negative Staphilococci are the most common causes of infections of pacemaker and defibrillator systems. In this case an implantable cardioverter defibrillator pocket infection caused by an extremely rare ...

  19. [A clinical retrospective study of 10 years implant results].

    Science.gov (United States)

    Lin, Ye; Li, Jian-hui; Qiu, Li-xin; Di, Ping; Hu, Xiu-lian; Wang, Xing

    2006-03-01

    To evaluate ten years clinical results of dental implant treatment. A total of 5,590 endosseous implants were consecutively placed from Aug. 1994 to Aug 2004 in Center of Implantation, Peking University School and Hospital of Stomatology. Among them, 161 were Brånemark implants, 1,436 were Frialit-2 implants, 1,012 were IMZ implants, 767 were Ankylos implants, 2,189 were Camlog implants, and 25 were Komet implants. A total of 2,629 prostheses were delivered, including 2,314 fixed prostheses and 315 implant-supported removable dentures. The patient age range was between 17 and 82. The mean follow-up time was 77.2 months (7 to 121 months). Clinical examination and X-ray films were conducted. The results were evaluated with Wheeler's survival criteria. With the final prostheses, 2,624 patients were satisfied. Five patients were unsatisfied with the prostheses. With refabricating the prostheses, 4 patients were satisfied and one expressed as acceptable. Peri-implantitis was observed in 178 implants of 105 cases. Prostheses loose was observed in 21 cases and fracture in 4 cases. Ceramic crack was observed in 51 cases. The documented implants lost were 68. The implant survival rate was 96.7% according to Wheeler's survival criteria. Implant prostheses were with high satisfaction. The implant survival rate was as highly as 96.7%. Implant prostheses were indicated for almost all the partial and complete edentulous cases due to modern implant surgical technique.

  20. Electrochemical disinfection of dental implants--a proof of concept

    National Research Council Canada - National Science Library

    Mohn, Dirk; Zehnder, Matthias; Stark, Wendelin J; Imfeld, Thomas

    2011-01-01

    .... An unexpected approach to implant disinfection may evolve from electrolysis. Given the electrical conductivity of titanium implants, alkalinity or active oxidants can be generated in body fluids...

  1. A Classification Proposal for Peri-Implant Mucositis and Peri-Implantitis: A Critical Update

    Science.gov (United States)

    Ata-Ali, Javier; Ata-Ali, Fadi; Bagan, Leticia

    2015-01-01

    Definitions of peri-implant mucositis and peri-implantitis vary in the literature, and no clear criteria have been established for the diagnosis and treatment of such disorders. This study proposes a classification for peri-implant mucositis and peri-implantitis based on the severity of the disease, using a combination of peri-implant clinical and radiological parameters to classify severity into several stages (Stage 0A and 0B = peri-implant mucositis, and Stage I to IV = periimplantitis). Following a review of the literature on the subject and justification of the proposed peri-implant disease classification, the latter aims to facilitate professional communication and data collection for research and community health studies. PMID:26966463

  2. Bilateral Poly Implant Prothèse Implant Rupture: An Uncommon Presentation

    Directory of Open Access Journals (Sweden)

    Peter Mallon

    2013-07-01

    Full Text Available Summary: A woman in her 50s underwent delayed bilateral Poly Implant Prothèse implant reconstruction following mastectomy for breast cancer. Symptoms of implant rupture developed 43 months after surgery with an erythematous rash on her trunk. The rash then spread to her reconstructed breast mounds. Initial ultrasound scan and magnetic resonance imaging were normal; however, subsequent magnetic resonance imaging demonstrated left implant rupture only. In theater, following removal of both implants, both were found to be ruptured. The rash on her trunk resolved within 3 weeks in the postoperative period. Chemical analyses of silicone in both implants confirmed a nonauthorized silicone source; in addition, the chemical structure was significantly different between the left and right implant, perhaps explaining the variation in presentation.

  3. The Role of Occlusion in the Dental Implant and Peri-implant Condition: A Review.

    Science.gov (United States)

    Graves, Carmen V; Harrel, Steve K; Rossmann, Jeffrey A; Kerns, David; Gonzalez, Jorge A; Kontogiorgos, Elias D; Al-Hashimi, Ibtisam; Abraham, Celeste

    2016-01-01

    Dental implants have become a widely used dental treatment approach. It is important to identify factors that can be detrimental to dental implants and the peri-implant complex. There is controversy regarding whether occlusion plays a role in the implant and peri-implant condition. The present study aims to review the scientific literature regarding this topic. Animal and human studies, and previous reviews on the topic are included and presented. There is a wide heterogeneity among study designs. Several articles demonstrated that occlusion and occlusion overload could detrimentally affect the peri-implant condition, while other articles did not support these results. More studies are needed to help understand the mechanisms by which occlusion might play a role in the peri-implant condition.

  4. [Bioethical issues in pediatric cochlear implants].

    Science.gov (United States)

    Santos Santos, S

    2002-10-01

    The use of cochlear implants can modify significantly the way in which deaf children relate with the outside world through psychological, linguistic and cognitive changes. The main question about this subject is the ethical controversy with regards to who has the right to make such a decision for a young child. We present the children evaluated at our hospital in order to assess the cochlear implant option. That population was of 37 implanted children, 10 children waiting for surgery and 21 rejected children. We describe and analyze from the bioethical bases and methodology the problems found: decision of no implant in children of hearing parents, the deaf culture point of view, the mature minor doctrine, teenagers, social and cultural problems, multihandicapped children and responsibility of the implants team.

  5. Soft tissue biotype affects implant success.

    Science.gov (United States)

    Lee, Angie; Fu, Jia-Hui; Wang, Hom-Lay

    2011-06-01

    The influence of tissue biotype in natural dentition is already well demonstrated in the literature, with numerous articles showing that thicker tissue is a preferred biotype for optimal surgical and prosthetic outcomes. In this same line of thought, current studies are directed to explore whether mucosal thickness would have similar implications around dental implants. The purpose of this review was to investigate the effects of soft tissue biotype in relation to success of implant therapy. The influence of tissue biotype was divided into 3 main categories: its relationship with periimplant mucosa and the underlying bone, immediate implant placement, and restorative outcomes. Soft tissue biotype is an important parameter to consider in achieving esthetic implant restoration, improving immediate implant success, and preventing future mucosal recession.

  6. Bone manipulation procedures in dental implants.

    Science.gov (United States)

    Mittal, Yuvika; Jindal, Govind; Garg, Sandeep

    2016-01-01

    The use of dental implants for the rehabilitation of missing teeth has broadened the treatment options for patients and clinicians equally. As a result of advances in research in implant design, materials, and techniques, the use of dental implants has increased dramatically in the past two decades and is expected to expand further in the future. Success of dental implants depends largely on the quality and quantity of the available bone in the recipient site. This however may be compromised or unavailable due to tumor, trauma, periodontal disease, etc., which in turn necessitates the need for additional bone manipulation. This review outlines the various bone manipulation techniques that are used to achieve a predictable long-term success of dental implants.

  7. Oral squamous cell carcinoma around dental implants.

    Science.gov (United States)

    Czerninski, Rakefet; Kaplan, Ilana; Almoznino, Galit; Maly, Alexander; Regev, Eran

    2006-10-01

    It is well documented that oral squamous cell carcinoma (OSCC) is related to risk factors such as smoking and alcohol consumption as well as premalignant lesions and conditions such as leukoplakia, oral lichen planus (OLP), and previous malignancy of the upper respiratory system and gastrointestinal tract. Osseointegrated dental implants are rarely reported in association with OSCC. This article presents 2 cases of OSCC adjacent to dental implants in patients at risk for oral cancer--1 was a heavy smoker with OLP; the other had a history of previous oral and colon cancer. Six additional cases of malignancy adjacent to dental implants were retrieved from the literature; the majority of cases had at least 1 recognized risk factor for oral cancer. Although such cases are rarely reported, patients at risk for oral cancer, especially those with multiple existing risk factors, that present with failing dental implants should be thoroughly evaluated to rule out the presence of malignancy disguised as peri-implant disease.

  8. Silicone breast implants and connective tissue disease

    DEFF Research Database (Denmark)

    Lipworth, Loren; Holmich, Lisbet R; McLaughlin, Joseph K

    2011-01-01

    -analyses and critical reviews, which have demonstrated that cosmetic breast implants are not associated with a subsequent increased occurrence of individual CTDs or all CTDs combined, including fibromyalgia. Moreover, there is no credible evidence for the conjectured excess of "atypical" CTD among women with cosmetic...... CTD, has been extensively studied. We have reviewed the epidemiologic literature regarding an association between cosmetic breast implants and CTDs, with particular emphasis on results drawn from the most recent investigations, many of which are large cohort studies with long-term follow-up, as well...... breast implants, or of a rheumatic symptom profile unique to these women. No increased risk of CTDs is evident in women with extracapsular ruptures in two studies, which evaluated risk by implant rupture status, and no consistent association has been observed between silicone breast implants...

  9. Diagnostic Imaging for Dental Implant Therapy

    Directory of Open Access Journals (Sweden)

    Aishwarya Nagarajan

    2014-01-01

    Full Text Available Dental implant is a device made of alloplastic (foreign material implanted into the jaw bone beneath the mucosal layer to support a fixed or removable dental prosthesis. Dental implants are gaining immense popularity and wide acceptance because they not only replace lost teeth but also provide permanent restorations that do not interfere with oral function or speech or compromise the self-esteem of a patient. Appropriate treatment planning for replacement of lost teeth is required and imaging plays a pivotal role to ensure a satisfactory outcome. The development of pre-surgical imaging techniques and surgical templates helps the dentist place the implants with relative ease. This article focuses on various types of imaging modalities that have a pivotal role in implant therapy.

  10. Etonogestrel contraceptive implant-associated secondary anorgasmia.

    Science.gov (United States)

    Chapa, Hector O; Ramirez, Alexiya; Dawson, Daniel

    2017-10-01

    The etonogestrel contraceptive implant is a 4-cm radio-opaque subdermal rod, inserted in the nondominant arm, providing up to 3 years of continuous contraception. We describe a 21-year-old nulligravid, nondepressed female who experienced new-onset secondary anorgasmia 1 month after etonogestrel insertion. Off-label, oral use of bupropion and sildenafil did not restore orgasmic ability. Finally, 1 week after implant removal (4½ months after insertion), spontaneous return of orgasmic ability occurred. Anorgasmia after etonogestrel implant use is a rare adverse event; nonetheless, clinicians should be alert to its possibility. This report documents secondary anorgasmia in a nondepressed female temporally associated with etonogestrel implant insertion. Clinicians should be aware that this rare event can occur but is quickly reversible with implant removal. Copyright © 2017 Elsevier Inc. All rights reserved.

  11. Dental implants in patients with bruxing habits.

    Science.gov (United States)

    Lobbezoo, F; Brouwers, J E I G; Cune, M S; Naeije, M

    2006-02-01

    Bruxism (teeth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence for this is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly because of the large variation in the literature in terms of both the technical aspects and the biological aspects of the study material. Although there is still no proof for the suggestion that bruxism causes an overload of dental implants and of their suprastructures, a careful approach is recommended. There are a few practical guidelines as to minimize the chance of implant failure. Besides the recommendation to reduce or eliminate bruxism itself, these guidelines concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the protection of the final result with a hard occlusal stabilization splint (night guard).

  12. Ion Implantation and Synthesis of Materials

    CERN Document Server

    Nastasi, Michael

    2006-01-01

    Ion implantation is one of the key processing steps in silicon integrated circuit technology. Some integrated circuits require up to 17 implantation steps and circuits are seldom processed with less than 10 implantation steps. Controlled doping at controlled depths is an essential feature of implantation. Ion beam processing can also be used to improve corrosion resistance, to harden surfaces, to reduce wear and, in general, to improve materials properties. This book presents the physics and materials science of ion implantation and ion beam modification of materials. It covers ion-solid interactions used to predict ion ranges, ion straggling and lattice disorder. Also treated are shallow-junction formation and slicing silicon with hydrogen ion beams. Topics important for materials modification, such as ion-beam mixing, stresses, and sputtering, are also described.

  13. Living with an implantable cardioverter defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S; Knudsen, Charlotte; Dilling, Karen

    2017-01-01

    AIMS: The clinical management and care of patients with an implantable cardioverter defibrillator (ICD) has shifted from face-to-face in-clinic visits to remote monitoring. Reduced interactions between patients and healthcare professionals may impede patients' transition to adapting post-implant.......AIMS: The clinical management and care of patients with an implantable cardioverter defibrillator (ICD) has shifted from face-to-face in-clinic visits to remote monitoring. Reduced interactions between patients and healthcare professionals may impede patients' transition to adapting post......-implant. We examined patients' needs and preferences for information provision and care options and overall satisfaction with treatment. METHODS AND RESULTS: Patients implanted with a first-time ICD or defibrillator with cardiac resynchronization therapy (n = 389) within the last 2 years at Odense University...

  14. Surface characterization of titanium based dental implants; Caracterizacao de implantes odontologicos a base de titanio

    Energy Technology Data Exchange (ETDEWEB)

    Castilho, Guilherme Augusto Alcaraz

    2006-07-01

    Dental implantology uses metallic devices made of commercially pure titanium in order to replace lost teeth. Titanium presents favorable characteristics as bio material and modern implants are capable of integrate, witch is the union between bone and implant without fibrous tissue development. Three of the major Brazilian implant manufacturers were chosen to join the study. A foreign manufacturer participated as standard. The manufacturers had three specimens of each implant with two different surface finishing, as machined and porous, submitted to analysis. Surface chemical composition and implant morphology were analyzed by X-ray photoelectron spectroscopy (XP S), scanning electron microscopy (SEM) and microprobe. Implant surface is mainly composed of titanium, oxygen and carbon. Few contaminants commonly present on implant surface were found on samples. Superficial oxide layer is basically composed of titanium dioxide (TiO{sub 2}), another oxides as Ti O and Ti{sub 2}O{sub 3} were also found in small amount. Carbon on implant surface was attributed to manufacturing process. Nitrogen, Phosphorous and Silicon appeared in smaller concentration on surface. There was no surface discrepancy among foreign and Brazilian made implants. SEM images were made on different magnification, 35 X to 3500 X, and showed similarity among as machined implants. Porous surface finishing implants presented distinct morphology. This result was attributed to differences on manufacturing process. Implant bioactivity was accessed through immersion on simulated body solution (SBF) in order to verify formation of an hydroxyapatite (HA) layer on surface. Samples were divided on three groups according to immersion time: G1 (7 days), G2 (14 days), G3 (21 days), and deep in SBF solution at 37 deg C. After being removed from solution, XPS analyses were made and then implants have been submitted to microprobe analysis. XPS showed some components of SBF solution on sample surface but microprobe

  15. Peri-Implant Sulcus Fluid (PISF) Matrix Metalloproteinase (MMP) -8 Levels in Peri-Implantitis.

    Science.gov (United States)

    Thierbach, René; Maier, Kurt; Sorsa, Timo; Mäntylä, Päivi

    2016-05-01

    Matrix Metalloproteinase (MMP) -8 plays crucial role in pathogenesis of periodontitis and is also a possible biomarker candidate in peri-implantitis. The aim of the study was to analyse MMP-8 levels in peri-Implant Sulcus Fluid (PISF) from peri-implantitis affected implants in smoking and non-smoking patients with different periodontal health status of natural teeth before and after peri-implantitis treatment. Altogether 29 patients with peri-implantitis were recruited and divided into two study groups (11 with healthy periodontium or gingivitis, i.e. no marginal bone loss, and 18 with chronic periodontitis). PISF sample from one implant with peri-implantitis from each patient was collected at the baseline and six months after conservative and surgical peri-implantitis treatment, and clinical parameters were registered. Samples were analysed for MMP-8 with dento ELISA method applying a monoclonal antibody. Mucosal cell samples were also analysed for IL-1 gene polymorphism. PISF MMP-8 levels' differences between periodontal diagnosis groups and between smokers' and non-smokers' were analysed. Also, IL-1 polymorphism profiles were compared between study groups. PISF MMP-8 levels were higher at the baseline compared to and after the treatment when all sampled implant sites were analysed together (p = 0.001). MMP-8 levels' distribution was broader in periodontitis patients' PISF samples, and only in periodontitis patients' group levels decreased statistically significantly after the treatment (p = 0.005). Smokers'and non-smokers' PISF MMP-8 was at similar level both at the baseline and after the treatment. No difference between distributions of IL-1 genotypes was found between study groups. MMP-8 levels increase in peri-implantitis affected implants both in non-periodontitis and periodontitis patients, but levels still after treatment of the condition reflect intensified host response around implants and indicate challenges of controlling peri-Implantitis with any

  16. Comparison of retention and stability of implant-retained overdentures based upon implant number and distribution.

    Science.gov (United States)

    Scherer, Michael D; McGlumphy, Edwin A; Seghi, Robert R; Campagni, Wayne V

    2013-01-01

    The purpose of this investigation was to evaluate the effects of number and distribution of implants upon in vitro dislodging forces to a simulated implant-supported overdenture and to examine differences between several different attachment systems. An experiment was undertaken utilizing a model simulating a mandibular edentulous ridge with dental implants in positions on the model approximating tooth positions in the natural dentition. A cobalt-chromium-cast testing framework was used to measure the peak load required to disconnect an attachment. Four different types of commercially available attachments were used in various positions on the model in sequence to evaluate the effects of retention and stability of overdentures based on implant number and distribution: (1) ERA, (2) O-Ring, (3) Locator, and (4) Ball. For each group, 10 measurements were made of peak dislodging forces. Means were calculated and differences among the systems, directions, and groups were identified using a repeated measured analysis of variance (α = .05). The interactions between the attachment system, direction of force, and implant number and distribution were statistically significant. Vertical dislodging forces of the simulated overdenture prosthesis increased with additional widely spaced implants. Oblique dislodging forces of the simulated prosthesis increased with additional widely spaced implants except in the two-implant model with all attachments, and in the four-implant groups with Locator attachments. Anteroposterior dislodging forces of a simulated overdenture prosthesis increased with additional widely spaced implants except in the four-implant groups with Ball and Locator attachments. Ball attachments reported the highest levels of retention and stability followed by Locator, O-Ring, and ERA. Within the limitations of this study, retention and stability of an implant overdenture prosthesis are significantly affected by implant number, implant distribution, and abutment

  17. The efficacy of flapless implant surgery on soft-tissue profile comparing immediate loading implants to delayed loading implants: A comparative clinical study

    OpenAIRE

    Ravindran Deepak; Sudhakar Uma; Ramakrishnan T; Ambalavanan N

    2010-01-01

    Aims and Objectives : To assess the efficacy of flapless implant surgery on soft-tissue profile and to compare the clinical outcomes of flapless implant therapy on immediate loading (IL) implants to delayed loading (DL) implants. Materials and Methods : The study sample consisted of 20 patients who were partially edentulous in the anterior maxillary region. They were divided into two groups. In group I (IL) 10 implants were placed and immediately provisionalized and restored with a metal cera...

  18. Are short implants in the mandible safe?

    Directory of Open Access Journals (Sweden)

    Sergio Henrique Gonçalves Motta

    2009-10-01

    Full Text Available Objective: To analyze the importance of bioengineering and the improvement in surgical techniques demonstrated by the rates attained of the prevalence of successful placement of dental implants in the posterior region of the mandible, in D3 bone quality in patients between the ages of 52 and 60 years, with dentures fixed on 8.5 mm implants. Methods: The statistical data for this retrospective study were collected at the Post-Graduation Center of the Integrated Dentistry Center, Faculty of Sarandi / Academy of Dentistry - Rio de Janeiro, at the CLIVO clinic, from among a total of 2.294 implants placed in the mandible, in the period from 1999 to 2007. There was a total of 1.056 short implants, of a length shorter than or equal to 10 mm, among which 20 implants were randomly chosen and analyzed. Results: The data were treated statistically and comparison of these data was consubstantiated in constructive data analysis by means of Statistical Pattern Recognition Methods for each variable under study. A success rate of 85% was obtained, and the need to take certain care when indicating the use of short implants was verified. Conclusion: Bioengineering and the development of present day surgical techniques have optimized the use of short implants, with the aim of avoiding advanced surgeries. To compensate the smaller size, there are some factors that must be observed, such as: Bone quality, crown/implant ratio, number and diameter of implants, macroscopic and microscopic geometry of the implants, magnitude of mesial occlusal forces.

  19. Definition and prevalence of peri-implant diseases.

    Science.gov (United States)

    Zitzmann, Nicola U; Berglundh, Tord

    2008-09-01

    The aim of the current review was to describe the prevalence of peri-implant diseases including peri-implant mucositis and peri-implantitis. A MEDLINE search (PubMed) until December 2007 was conducted and different keywords related to the prevalence of peri-implant diseases were used. Cross-sectional and longitudinal studies including > or =50 implant-treated subjects exhibiting a function time of > or =5 years were considered. The current review revealed that only a few studies provided data on the prevalence of peri-implant diseases. Cross-sectional studies on implant-treated subjects are rare and data from only two study samples were available. Peri-implant mucositis occurred in approximately 80% of the subjects and in 50% of the implants. Peri-implantitis was found in 28% and > or =56% of subjects and in 12% and 43% of implant sites.

  20. Probing around implants and teeth with healthy or inflamed peri-implant mucosa/gingival. A histologic comparison in cynomolgus monkeys. (Macaca fascicularis)

    DEFF Research Database (Denmark)

    Schou, Søren; Holmstrup, Palle; Stoltze, K.

    2002-01-01

    Osseointegrated oral implants; teeth; phathology; peri-implant mucositis; gingivitis; peri-implantitis; periodontitis; diagnosis; probing depth; non-human primates; cynomolgus monkeys: Macaca fascicularis...

  1. Histology of a dental implant with a platform switched implant-abutment connection

    Directory of Open Access Journals (Sweden)

    Vittoria Perrotti

    2011-10-01

    Full Text Available Background: Peri-implant crestal bone must be stable for aesthetic reasons. Aim of this study was a histologic analysis of an implant with a platform switched implant-abutment connection. Materials and methods: A 32-year-old male patient participated in this study. The patient needed a bilateral mandibular restoration. Four implants were used, and were immediately restored and loaded the same day of insertion. After a 6 weeks healing period, one implant with platform-switched abutment was retrieved with trephine. Before retrieval the implant was osseointegrated and not mobile. On one side of the implant, a 1 mm resorption of the crestal bone was present. On the contrary, on the other side no bone resorption had occurred and about 1 mm of bone was present over the implant shoulder. Results: The bone-implant contact percentage was 65.1 ± 6.3 %. Platform- switching could help in maintaining the height of the peri-implant crestal bone.

  2. The Clinical Implications of Poly Implant Prothèse Breast Implants: An Overview

    Directory of Open Access Journals (Sweden)

    Umar Wazir

    2015-01-01

    Full Text Available Mammary implants marketed by Poly Implant Prothèse (PIP were found to contain industrial grade silicone and this caused heightened anxiety and extensive publicity regarding their safety in humans. These implants were used in a large number of patients worldwide for augmentation or breast reconstruction. We reviewed articles identified by searches of Medline, PubMed, Embase, and Google Scholar databases up to May 2014 using the terms: "PIP", "Poly Implant Prothèse", "breast implants" and "augmentation mammoplasty" "siloxanes" or "silicone". In addition the websites of regulating bodies in Europe, USA, and Australia were searched for reports related to PIP mammary implants. PIP mammary implants are more likely to rupture than other implants and can cause adverse effects in the short to the medium term related to the symptoms of rupture such as pain, lumps in the breast and axilla and anxiety. Based on peer-reviewed published studies we have calculated an overall rupture rate of 14.5% (383/2,635 for PIP implants. However, there is no evidence that PIP implant rupture causes long-term adverse health effects in humans so far. Silicone lymphadenopathy represents a foreign body reaction and should be treated conservatively. The long-term adverse effects usually arise from inappropriate extensive surgery, such as axillary lymph node dissection or extensive resection of breast tissue due to silicone leakage.

  3. An economic evaluation of maxillary implant overdentures based on six vs. four implants

    Science.gov (United States)

    2014-01-01

    Background The purpose of the present study was to assess the value for money achieved by bar-retained implant overdentures based on six implants compared with four implants as treatment alternatives for the edentulous maxilla. Methods A Markov decision tree model was constructed and populated with parameter estimates for implant and denture failure as well as patient-centred health outcomes as available from recent literature. The decision scenario was modelled within a ten year time horizon and relied on cost reimbursement regulations of the German health care system. The cost-effectiveness threshold was identified above which the six-implant solution is preferable over the four-implant solution. Uncertainties regarding input parameters were incorporated via one-way and probabilistic sensitivity analysis based on Monte-Carlo simulation. Results Within a base case scenario of average treatment complexity, the cost-effectiveness threshold was identified to be 17,564 € per year of denture satisfaction gained above of which the alternative with six implants is preferable over treatment including four implants. Sensitivity analysis yielded that, depending on the specification of model input parameters such as patients’ denture satisfaction, the respective cost-effectiveness threshold varies substantially. Conclusions The results of the present study suggest that bar-retained maxillary overdentures based on six implants provide better patient satisfaction than bar-retained overdentures based on four implants but are considerably more expensive. Final judgements about value for money require more comprehensive clinical evidence including patient-centred health outcomes. PMID:25135370

  4. Osseointegration of zirconia implants: an SEM observation of the bone-implant interface.

    Science.gov (United States)

    Depprich, Rita; Zipprich, Holger; Ommerborn, Michelle; Mahn, Eduardo; Lammers, Lydia; Handschel, Jörg; Naujoks, Christian; Wiesmann, Hans-Peter; Kübler, Norbert R; Meyer, Ulrich

    2008-11-06

    The successful use of zirconia ceramics in orthopedic surgery led to a demand for dental zirconium-based implant systems. Because of its excellent biomechanical characteristics, biocompatibility, and bright tooth-like color, zirconia (zirconium dioxide, ZrO2) has the potential to become a substitute for titanium as dental implant material. The present study aimed at investigating the osseointegration of zirconia implants with modified ablative surface at an ultrastructural level. A total of 24 zirconia implants with modified ablative surfaces and 24 titanium implants all of similar shape and surface structure were inserted into the tibia of 12 Göttinger minipigs. Block biopsies were harvested 1 week, 4 weeks or 12 weeks (four animals each) after surgery. Scanning electron microscopy (SEM) analysis was performed at the bone implant interface. Remarkable bone attachment was already seen after 1 week which increased further to intimate bone contact after 4 weeks, observed on both zirconia and titanium implant surfaces. After 12 weeks, osseointegration without interposition of an interfacial layer was detected. At the ultrastructural level, there was no obvious difference between the osseointegration of zirconia implants with modified ablative surfaces and titanium implants with a similar surface topography. The results of this study indicate similar osseointegration of zirconia and titanium implants at the ultrastructural level.

  5. Osseointegration of zirconia implants: an SEM observation of the bone-implant interface

    Directory of Open Access Journals (Sweden)

    Naujoks Christian

    2008-11-01

    Full Text Available Abstract Background The successful use of zirconia ceramics in orthopedic surgery led to a demand for dental zirconium-based implant systems. Because of its excellent biomechanical characteristics, biocompatibility, and bright tooth-like color, zirconia (zirconium dioxide, ZrO2 has the potential to become a substitute for titanium as dental implant material. The present study aimed at investigating the osseointegration of zirconia implants with modified ablative surface at an ultrastructural level. Methods A total of 24 zirconia implants with modified ablative surfaces and 24 titanium implants all of similar shape and surface structure were inserted into the tibia of 12 Göttinger minipigs. Block biopsies were harvested 1 week, 4 weeks or 12 weeks (four animals each after surgery. Scanning electron microscopy (SEM analysis was performed at the bone implant interface. Results Remarkable bone attachment was already seen after 1 week which increased further to intimate bone contact after 4 weeks, observed on both zirconia and titanium implant surfaces. After 12 weeks, osseointegration without interposition of an interfacial layer was detected. At the ultrastructural level, there was no obvious difference between the osseointegration of zirconia implants with modified ablative surfaces and titanium implants with a similar surface topography. Conclusion The results of this study indicate similar osseointegration of zirconia and titanium implants at the ultrastructural level.

  6. Influence Of Implantation Age On School-Age Language Performance In Pediatric Cochlear Implant Users

    Science.gov (United States)

    Tobey, Emily A.; Thal, Donna; Niparko, John K.; Eisenberg, Laurie S.; Quittner, Alexandra L.; Wang, Nae-Yuh

    2013-01-01

    Objective This study examined specific spoken language abilities of 160 children with severe-to-profound sensorineural hearing loss followed prospectively 4, 5, or 6 years after cochlear implantation. Study sample Ninety-eight children received implants before 2.5 years, and 62 children received implants between 2.5 and 5 years of age. Design Language was assessed using four subtests of the Comprehensive Assessment of Spoken Language (CASL). Standard scores were evaluated by contrasting age of implantation and follow-up test time. Results Children implanted under 2.5 years of age achieved higher standard scores than children with older ages of implantation for expressive vocabulary, expressive syntax, and pragmatic judgments. However, in both groups, some children performed more than two standard deviations below the standardization group mean, while some scored at or well above the mean. Conclusions Younger ages of implantation are associated with higher levels of performance, while later ages of implantation are associated with higher probabilities of continued language delays, particularly within subdomains of grammar and pragmatics. Longitudinal data from this cohort study demonstrate that after 6 years of implant experience, there is large variability in language outcomes associated with modifiers of rates of language learning that differ as children with implants age. PMID:23448124

  7. Dental implant surfaces after insertion in bone: an in vitro study in four commercial implant systems.

    Science.gov (United States)

    Deppe, Herbert; Wolff, Carolina; Bauer, Florian; Ruthenberg, Ricarda; Sculean, Anton; Mücke, Thomas

    2017-10-24

    Primary healing of dental implants is influenced by their surface morphology. However, little is known about any alterations in morphology during their insertion. Therefore, the aim of this study was to evaluate the surface morphology of four different implant systems, following their insertion in porcine jaw bones. Four fresh porcine mandible specimens were used. Six new implants of four systems (Ankylos® 4.5 × 14 mm, Frialit Synchro® 4.5 × 15 mm, NobelReplace ® Tapered Groovy RP 4.3 × 13 mm, Straumann SLA® Bone Level 3.3 × 14 mm) were inserted, whereas one implant of each system served as a control. After their removal, implants were cleaned in an ultrasonic bath. All 28 implants were examined quantitatively by 3D confocal microscopy for surface characteristics. In the evaluated zones, implants of the Ankylos, Frialit, and Straumann systems showed mostly a reduction of the mean surface roughness Sa, the maximal surface roughness Sz, and the developed surface area ratio Sdr; Nobel implants showed an increase in these parameters. With respect to all three parameters Sa, Sz, and Sdr, statistical analysis revealed that differences between the four systems were highly significant in the apical region of implants. Controls showed no morphologic alterations. The insertion process had an impact on the surface of all four implant systems. Anodized implant surface modification seems to result in more alterations compared with subtractive surface modifications. Therefore, surgical planning should take into consideration the choice of surface treatment because the characteristics of the implants may be modified during the installation process. The given information is of value for daily implantation practice and the course of osseointegration.

  8. Updated secondary implant stability data of two dental implant systems. A retrospective cohort study.

    Science.gov (United States)

    Grognard, Nicolas; Verleye, Gino; Mavreas, Dimitrios; Vande-Vannet, Bart

    2017-09-01

    At present, updated secondary implant stability data generated by actual versions of resonance frequency analysis (RFA) and mobility measurement (MM) electronic devices of 2 different implant systems with actual manufactured surfaces seem to lack and/or are incomplete. Secondary implant stability data based on both RFA and MM measurements were collected and analyzed from 44 formerly treated patients (24 f, 20 m) that received either Ankylos Cellplus (Ø3.5mm) (A) (n=36) or Straumann regular neck SLA tissue level (Ø4.1mm) (S) (n=37) implants in posterior positions of both jawbones (total number= 72). These results were interpretated in view of formerly published data. Estimated RFA outcomes (mean±SD) for A implants were of 81.23 (±0.65) (LP) - 76.15 (±1.57) (UP) isq; for S implants 76.15 (±1.48) (LP) - 73.88 (±2.34) (UP) isq. Estimated MM outcomes for A implants were (-4.0) (±0.23) (LP) - (-3.2) (±0.33) (UP) ptv; for S implants (-5.15) (±0.39) (LP) - (-4.4) (±0.84) (UP) ptv. According to GEE statistical modelling, implant type and - position seems to influence the outcome variables ( p 0.05). Secondary implant stability values, recorded with current RFA and MM devices, of A Cellplus implants are provided for the first time. A difference of 14.7-9.7 isq values was noted for CellPlus versus TPS S implants recorded with a cabled RFA device. This study supports the assumption that RFA outcomes generated with first generation RFA devices are different from those obtained with current RFA devices, meaning that its use in reviews need caution and correction. Key words: Secondary implant stability, resonance frequency analysis, Periotest, Osstell Mentor, Straumann, Ankylos, CellPlus, SLA.

  9. Six-implant-supported immediate fixed rehabilitation of atrophic edentulous maxillae with tilted distal implants.

    Science.gov (United States)

    Wentaschek, S; Hartmann, S; Walter, C; Wagner, W

    2017-12-01

    The aim of this retrospective study was to evaluate the treatment outcome of six Bredent blueSky™ implants (Bredent GmbH, Senden, Germany) immediately loaded with a fixed full-arch prosthesis (two tilted posterior and four axial frontal and premolar implants). All 10 patients with atrophic edentulous maxillae being treated with a standardized procedure from 09/2009 to 01/2013, who had a follow-up of at least 3 years, were included. Sixty implants were placed to support 10 screwed prostheses. Twenty-one of them were inserted in fresh extraction sockets. Lab-side-prepared provisional fixed prostheses were placed at the day of implantation. Periotest (PT) values and implant stability quotient (ISQ) were measured after implant surgery and after 3 months of healing in all patients. The analyzed implants were in function in mean 64 ± 13 months (range 42 to 84 months). One axial and two tilted implants failed in three patients. The mean PT values decreased, and ISQ increased significantly after the first 3 months at the osseointegrated tilted and axial implants. With an area under the curve of 0.503 and 0.506 in the receiver operating characteristic, the PT values and the ISQ were unspecific parameters and unsuitable as a predictor for the risk of non-osseointegration. Within the limits of this small group (n = 10 patients/60 implants), the failure rate of the analyzed implant system (n = 3 respective 5% implant loss) seems to be comparable with other immediate-loading protocols. The failure rate of tilted implants in the atrophic upper jaw was quite high, but the aimed treatment concept could be achieved in every patient. The rehabilitation of the posterior region in edentulous maxilla remains a challenge.

  10. Can degradation products released from dental implants affect peri-implant tissues?

    Science.gov (United States)

    Noronha Oliveira, M; Schunemann, W V H; Mathew, M T; Henriques, B; Magini, R S; Teughels, W; Souza, J C M

    2017-08-02

    This study aimed to assess the literature available on the effects, on peri-implant tissues, of degradation products released from dental implants as a consequence of therapeutic treatment for peri-implantitis and/or of wear-corrosion of titanium. A literature review of the PubMed medline database was performed up to December 31, 2016. The following search terms were used: "titanium wear and dental implant"; "titanium corrosion and dental implant"; "bio-tribocorrosion"; "peri-implantitis"; "treatment of peri-implantitis"; "titanium particles release and dental implant"; and "titanium ion release and dental implant". The keywords were applied to the database in different combinations without limits of time period or type of work. In addition, the reference lists of relevant articles were searched for further studies. Seventy-nine relevant scientific articles on the topic were retrieved. The results showed that pro-inflammatory cytokines, infiltration of inflammatory response cells and activation of the osteoclasts activity are stimulated in peri-implant tissues in the presence of metal particles and ions. Moreover, degenerative changes were reported in macrophages and neutrophils that phagocytosed titanium microparticles, and mutations occurred in human cells cultured in medium containing titanium-based nanoparticles. Debris released from the degradation of dental implants has cytotoxic and genotoxic potential for peri-implant tissues. Thus, the amount and physicochemical properties of the degradation products determine the magnitude of the detrimental effect on peri-implant tissues. © 2017 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  11. Athletes with Implantable Cardioverter Defibrillators

    Science.gov (United States)

    Ponamgi, Shiva P.; DeSimone, Christopher V.; Ackerman, Michael J.

    2015-01-01

    Summary Athletes with an implantable cardioverter defibrillator (ICD) represent a diverse group of individuals who may be at an increased risk of sudden cardiac death (SCD) when engaging in vigorous physical activity. Therefore, they are excluded by the current guidelines from participating in most competitive sports except those classified as low intensity, such as bowling and golf. The lack of substantial data on the natural history of the cardiac diseases affecting these athletes, as well as the unknown efficacy of implanted ICDs in terminating life-threatening arrhythmias occurring during intense exercise, have resulted in the restrictive nature of these now decade old guidelines. Recently, there is emerging data, derived from a few retrospective studies and a large prospective registry that demonstrates the relative safety of high-risk athletes participating in competitive sports and challenges the prohibitive nature of these guidelines. Nevertheless, the safe participation of all athletes with an ICD in competitive sports continues to be contemplated. The increased number of inappropriate shocks, damage to the ICD/pacemaker system, and the questionable efficacy of the delivered shock in the setting of vigorous physical activity are some of the main challenges faced by these athletes who choose to continue participation in competitive sports. The fear of SCD and ICD shocks faced by these athletes is also associated with a negative psychological burden and affects their quality of life, as does restricting them from all competitive sports. Therefore, shared decision making is necessary between the clinician and athlete after carefully analyzing the risks and benefits associated with competitive sports participation. PMID:26100423

  12. Soft tissue and esthetic considerations around implants

    Directory of Open Access Journals (Sweden)

    Joann Pauline George

    2015-01-01

    Full Text Available The health of the peri – implant tissues play an important in the long term outcome of dental implants. The absence of keratinized gingiva (KG may be a risk factor for developing recession or peri –implantitis. However there is still ambiguity in the need for keratinized gingiva around dental implants. The preservation and reconstruction of soft tissue around dental implants is an integral component of dental Implantology. There is no long-term evidence whether augmented soft tissues can be maintained over time and are able to influence the peri-implant bone levels. Among the various soft tissue augmentation techniques Apically positioned flap with vestibuloplasty , Free gingival grafts and Connective tissue grafts are documented as the most predictable methods to increase the width of KG. Autogenous grafts increase the soft tissue thickness and improve aesthetics compared to non-grafted sites. The aim of this review is to critically discuss the need for KG around implants and the techniques to preserve and augment KG. It is difficult to arrive at a definitive conclusion due to scarcity of well designed studies in literature. Reliable evidence is lacking to suggest the ideal soft tissue augmentation/preservation techniques. Long term randomized controlled clinical trials are needed to provide a clearer image.

  13. Correlating implant stability to bone structure.

    Science.gov (United States)

    Rozé, Julie; Babu, Stéphanie; Saffarzadeh, Afchine; Gayet-Delacroix, Marie; Hoornaert, Alain; Layrolle, Pierre

    2009-10-01

    The aim of this study was to demonstrate a possible correlation between bone microarchitecture and primary implant stability. Twenty-two implants (Ankylos((R)) and Straumann((R))) were inserted into the maxillae and mandibles of human cadavers. Bone structure was determined by computed tomography in three specimens (male, age 53; female, 67; female, 80). A strict clinical protocol was used for implantation. Primary implant stability was measured by resonance frequency analysis (Osstell Mentor). The bone structure was analyzed by micro-computed tomography (CT). Bone histomorphometrical parameters were calculated and correlated to primary implant stability. Implant stability quotients (ISQ) ranged from 50 to 70% depending on the specimens and sites. Histomorphometry indicated differences in the bone microstructures of the specimens. However, ISQ values were not related to trabecular bone histomorphometrical parameters. The sole correlation was found between ISQ values and cortical bone thickness. This study confirms the relevance for primary stability of cortical thickness around implants. The thickness of cortical bone can be assessed using a standard clinical CT.

  14. Treatment Alternatives to Negotiate Peri-Implantitis

    Science.gov (United States)

    Machtei, Eli E.

    2014-01-01

    Peri-implant diseases are becoming a major health issue in dentistry. Despite the magnitude of this problem and the potential grave consequences, commonly acceptable treatment protocols are missing. Hence, the present paper reviews the literature treatment of peri-implantitis in order to explore their benefits and limitations. Treatment of peri-implantitis may include surgical and nonsurgical approaches, either individually or combined. Nonsurgical therapy is aimed at removing local irritants from the implants' surface with or without surface decontamination and possibly some additional adjunctive therapies agents or devices. Systemic antibiotics may also be incorporated. Surgical therapy is aimed at removing any residual subgingival deposits and additionally reducing the peri-implant pockets depth. This can be done alone or in conjunction with either osseous respective approach or regenerative approach. Finally, if all fails, explantation might be the best alternative in order to arrest the destruction of the osseous structure around the implant, thus preserving whatever is left in this site for future reconstruction. The available literature is still lacking with large heterogeneity in the clinical response thus suggesting possible underlying predisposing conditions that are not all clear to us. Therefore, at present time treatment of peri-implantitis should be considered possible but not necessarily predictable. PMID:26556414

  15. Biomedical Imaging in Implantable Drug Delivery Systems.

    Science.gov (United States)

    Zhou, Haoyan; Hernandez, Christopher; Goss, Monika; Gawlik, Anna; Exner, Agata A

    2015-01-01

    Implantable drug delivery systems (DDS) provide a platform for sustained release of therapeutic agents over a period of weeks to months and sometimes years. Such strategies are typically used clinically to increase patient compliance by replacing frequent administration of drugs such as contraceptives and hormones to maintain plasma concentration within the therapeutic window. Implantable or injectable systems have also been investigated as a means of local drug administration which favors high drug concentration at a site of interest, such as a tumor, while reducing systemic drug exposure to minimize unwanted side effects. Significant advances in the field of local DDS have led to increasingly sophisticated technology with new challenges including quantification of local and systemic pharmacokinetics and implant- body interactions. Because many of these sought-after parameters are highly dependent on the tissue properties at the implantation site, and rarely represented adequately with in vitro models, new nondestructive techniques that can be used to study implants in situ are highly desirable. Versatile imaging tools can meet this need and provide quantitative data on morphological and functional aspects of implantable systems. The focus of this review article is an overview of current biomedical imaging techniques, including magnetic resonance imaging (MRI), ultrasound imaging, optical imaging, X-ray and computed tomography (CT), and their application in evaluation of implantable DDS.

  16. Transverse microanalysis of high energy Ion implants

    Energy Technology Data Exchange (ETDEWEB)

    Dooley, S.P.; Jamieson, D.N.; Nugent, K.W.; Prawer, S. [Melbourne Univ., Parkville, VIC (Australia). School of Physics

    1996-12-31

    High energy ion implants in semiconductor materials have been analyzed by Channeling Contrast Microscopy (CCM) perpendicular to the implant direction, allowing imaging of the entire ion track. The damage produced by Channeled and Random 1.4 MeV H{sup +} implants into the edge of a <100> type IIa diamond wafer were analyzed by channeling into the face of the crystal. The results showed negligible damage in the surface region of the implants, and swelling induced misalignment at the end of range of the implants. Channeled 1.4 MeV H{sup +} implants in diamond had a range only 9% deeper than Random implants, which could be accounted for by dechanneling of the beam. The channeling of H{sup +}{sub 2} ions has been previously found to be identical to that of protons of half energy, however the current experiment has shown a 1% increase in {chi}{sub min} for H{sup +}{sub 2} in diamond compared to H{sup +} at 1,2 MeV per proton. This is due to repulsion between protons within the same channel. 5 refs., 2 figs.

  17. Evolution of otosclerosis to cochlear implantation.

    Science.gov (United States)

    Muñoz-Fernández, Noelia; Morant-Ventura, Antonio; Achiques, María Teresa; Dualde-Beltrán, Delfina; Garcia-Callejo, F Javier; Monrroy-Parada, María Victoria; Pitarch, Ignacia; Latorre, Emilia; Marco-Algarra, Jaime

    2012-01-01

    Otosclerosis is an osteodystrophy of the labyrinthine capsule producing conductive hearing loss. If the process invades the cochlea, a sensorineural hearing loss usually takes place. The cochlear implant is a good alternative in these patients. To ascertain the behaviour of cochlear implantation in otosclerosis. We reviewed a database of 250 patients that underwent cochlear implantation, performing a retrospective study of 13 patients with clinical, audiological and/or imaging findings of bilateral otosclerosis. The 26 ears were studied as to their natural history, previous surgeries, evolution to profound hearing loss, computed tomography images, complications and functional results. Of the cases studied, 46% were female and 54% were men, with a mean age of 26 years at the onset of conductive hearing loss. Stapes surgery was performed in 19 ears (73%), with a mean patient age of 29 years, and 53% of them underwent cochlear implantation. Computed tomography results showed that there were signs of different degrees of radiological affectation in 54% of the ears. A total of 3 complications took place (23%): implant failure, overstimulation of the facial nerve and bilateral tinnitus were found. One year after implantation, the average percentages of correct 2-syllable words were 80% and 85% in open sentences. Patients having profound bilateral sensorineural hearing loss secondary to otosclerosis obtain great benefit from cochlear implantation. Copyright © 2011 Elsevier España, S.L. All rights reserved.

  18. Autoinflammation Around AES Total Ankle Replacement Implants.

    Science.gov (United States)

    Koivu, Helka; Takakubo, Yuya; Mackiewicz, Zygmunt; Al-Samadi, Ahmed; Soininen, Antti; Peled, Nitai; Kukis, Modestas; Trokovic, Nina; Konttinen, Yrjö T

    2015-12-01

    Failure of total ankle replacement (TAR) can be characterized by early peri-implant osteolysis even in the presence of very modest numbers of wear particles. The hypothesis of the study was that this reaction is in part mediated by autoinflammatory responses mediated via damage-associated molecular patterns (DAMPs, danger signals) and pattern-recognizing danger signal receptors (PRRs). Peri-implant tissue and control samples from 10 patients with AES implants were immunostained for hypoxia inducible factor-1α (HIF-1α), activated caspase-3, high-mobility group box 1 (HMGB1), receptor for advanced glycation end product (RAGE), and toll-like receptors TLR2 and TLR4. Results were evaluated on a 0 to 4 scale (from 0% to >50% stained area). Peri-implant tissue around failed TAR implants had a relatively high mean HIF-1α score of 3 on a scale, which however was similar in control samples. HMGB1 (a DAMP) was seen to be mobilized from nuclei to cellular cytoplasm, and the active caspase-3(+) cells were increased. All PRRs were increased in revision samples. Increased expression of HMGB1 and other danger signals together with increased PRR-dependent responsiveness could contribute to autoinflammatory peri-implantitis, multilocular cyst formation, and osteolysis in failed TAR implants. Level IV, case series. © The Author(s) 2015.

  19. Audiovisual segregation in cochlear implant users.

    Directory of Open Access Journals (Sweden)

    Simon Landry

    Full Text Available It has traditionally been assumed that cochlear implant users de facto perform atypically in audiovisual tasks. However, a recent study that combined an auditory task with visual distractors suggests that only those cochlear implant users that are not proficient at recognizing speech sounds might show abnormal audiovisual interactions. The present study aims at reinforcing this notion by investigating the audiovisual segregation abilities of cochlear implant users in a visual task with auditory distractors. Speechreading was assessed in two groups of cochlear implant users (proficient and non-proficient at sound recognition, as well as in normal controls. A visual speech recognition task (i.e. speechreading was administered either in silence or in combination with three types of auditory distractors: i noise ii reverse speech sound and iii non-altered speech sound. Cochlear implant users proficient at speech recognition performed like normal controls in all conditions, whereas non-proficient users showed significantly different audiovisual segregation patterns in both speech conditions. These results confirm that normal-like audiovisual segregation is possible in highly skilled cochlear implant users and, consequently, that proficient and non-proficient CI users cannot be lumped into a single group. This important feature must be taken into account in further studies of audiovisual interactions in cochlear implant users.

  20. Esthetic outcomes of immediate implant placements.

    Science.gov (United States)

    Evans, Christopher D J; Chen, Stephen T

    2008-01-01

    Single-rooted teeth deemed not restorable via conventional means may be candidates for implant placement at the time of tooth extraction. Immediate implant placements are believed to preserve soft and hard tissue form and contours, reduce the need for augmentation procedures, minimize surgical exposure of the patient, reduce treatment time and improve esthetic outcomes. This retrospective review analyzed the esthetic outcomes of 42 non-adjacent single-unit implant restorations completed using an immediate implant surgical placement protocol. The mean time in function was 18.9 months (range 6-50 months) and the majority of implants placed had a restorative platform diameter of 4.1 and 4.8 mm. A highly significant change in crown height due to marginal tissue recession of 0.9 +/- 0.78 mm (P=0.000) was recorded for all sites, with no difference seen between implant systems (P=0.837). Thin tissue biotype showed slightly greater recession than thick tissue biotype (1 +/- 0.9 vs. 0.7 +/- 0.57 mm, respectively); however, this difference was not statistically significant (P=0.187). Implants with a buccal shoulder position showed three times more recession than implants with a lingual shoulder position (1.8 +/- 0.83 vs. 0.6 +/- 0.55 mm, respectively) with the difference being highly statistically significant (P=0.000). Immediate implant placement requires very careful case selection and high surgical skill levels if esthetic outcomes are to be achieved. Long-term prospective studies on tissue stability and esthetic outcomes are needed.