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Sample records for totalmente implantables tipo

  1. Cateteres venosos centrais totalmente implantáveis para quimioterapia: experiência com 793 pacientes

    Directory of Open Access Journals (Sweden)

    Esmálio Barroso de Oliveira

    Full Text Available OBJETIVO: estudar retrospectivamente os resultados obtidos com a implantação de cateteres totalmente implantáveis em pacientes submetidos à quimioterapia. MÉTODOS: foram colocados 815 cateteres totalmente implantáveis em 793 pacientes submetidos ao regime de quimioterapia preferencialmente utilizando-se a veia cefálica direita. Foram avaliadas as complicações precoces e tardias. RESULTADOS: a análise retrospectiva mostrou duração média dos cateteres de 339 dias. Em 733 (90% cateteres não se observou nenhuma complicação. Entre as complicações precoces observamos um pneumotórax, um mau posicionamento de cateter, uma punção arterial, um sangramento, um hemotórax e hemomediastino e seis hematomas na loja de implantação. Entre as complicações tardias, ocorreram 35 infecções relacionadas ao cateter, dez infecções no sítio cirúrgico, seis obstruções e 20 tromboses. Foram retirados 236 cateteres, 35 devido às complicações e 201 por final de tratamento. CONCLUSÃO: os cateteres totalmente implantáveis para quimioterapia são meios seguros para a administração de substâncias, em vista do baixo número de complicações observadas neste estudo.

  2. Atuação da enfermagem na utilização do catéter venoso totalmente implantável (CVTI

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    Rosemeire A. Mendes Lopes

    1993-06-01

    Full Text Available As autoras fizeram um levantamento de 41 casos de utilização do cateter venoso totalmente implantável usados para tratamento com drogas antineoplásicas. Descreveram os motivos que levaram o serviço a utilizar este sistema para infusão e analisaram sua utilização, seu controle e as intercorrências. Os resultados, embora tenham mostrado um índice de complicações de 29%, incluindo falhas na técnica de implantação e no manuseio, apresentaram um bom índice de aproveitamento, ou seja, 61%.

  3. Manejo do cateter venoso central totalmente implantado em pacientes oncológicos: revisão integrative Manejo del catéter venoso central totalmente implantado en pacientes oncológicos: revisión integrativa Management of totally implanted catheter in patients with cancer: an integrative review

    Directory of Open Access Journals (Sweden)

    Christiane Inocêncio Vasques

    2009-10-01

    Full Text Available O cateter totalmente implantado é amplamente utilizado durante o tratamento de pacientes com câncer e é capaz de minimizar complicações decorrentes da terapia intravenosa periférica. Assim, buscou-se identificar os cuidados de enfermagem relacionados ao manuseio de cateter totalmente implantado nesses pacientes. Para tanto, realizou-se revisão integrativa da literatura que resultou na análise de 15 artigos. O conhecimento produzido está direcionado para o tempo de permanência do cateter, complicações inerentes ao uso, manuseio do dispositivo, percepção do paciente em relação ao cateter e informações ao paciente. Além de demonstrar a complexidade da assistência de enfermagem no manuseio desses dispositivos, os achados podem auxiliar, igualmente, os profissionais que não atuam em oncologia, na aplicação de conhecimentos na prática clínica.El catéter totalmente implantado es ampliamente utilizado durante el tratamiento de pacientes con cáncer y es capaz de minimizar las complicaciones consecuentes de la terapia intravenosa periférica. Así, en este trabajo, se buscó identificar los cuidados de enfermería relacionados a la manipulación del catéter totalmente implantado en esos pacientes. Para tal efecto, se realizó una revisión integrativa de la literatura dando como resultado el análisis de 15 artículos. El conocimiento producido está orientado hacia el tiempo de permanencia del catetér, complicaciones inherentes al uso, manipulación del dispositivo, informaciones y percepción del paciente en relación al catéter. Aparte de demostrar la complejidad de la asistencia de enfermería en la manipulación de esos dispositivos, los hallazgos pueden auxiliar, igualmente, a los profesionales que no actúan en oncología, en la aplicación de conocimientos en la práctica clínica.Totally implanted catheter, which is effective in deceasing complications related to peripheral intravenous therapy, is widely used in

  4. Laboratory implantation for well type ionization chambers calibration; Implantacao de um laboratorio para calibracao de camaras de ionizacao tipo poco

    Energy Technology Data Exchange (ETDEWEB)

    Vianello, E.A.; Dias, D.J.; Almeida, C.E. de [Laboratorio de Ciencias Radiologicas- LCR- DBB (UERJ). R. Sao Francisco Xavier, 524- Pav. HLC, sala 136 terreo- CEP 20.550-013. Rio de Janeiro (Brazil)

    1998-12-31

    The Radiological Science Laboratory is implanting a service for calibration of well type chambers by IAEA training program. The kerma rate in the air (mu Gy/h) of the linear Cs-137 reference source CDCS-J4 have been determined using a well type chamber Standard Imaging HDR-1000 model, which have been calibrated at Secondary Standard Laboratory Calibration of IAEA, whereas two HDR-1000 Plus chambers were calibrated too, following the same standards. The results were compared with Wisconsin University calibration certification and has demonstrated that well type ionization chamber calibration can be used in brachytherapy for several kinds of radionuclides. (Author)

  5. O oraloma da diabetes melitos tipo 1 vs diabetes melitos tipo 2 - um estudo comparativo

    OpenAIRE

    Brás, Vítor Daniel Moreira

    2013-01-01

    A Diabetes Melitos é uma doença de grande prevalência a nível mundial e os seus mecanismos fisiopatológicos não são ainda totalmente conhecidos. Actualmente, a terapêutica seguida em casos de Diabetes Melitos é eminentemente sintomática consistindo na administração de insulina nos casos de Diabetes Melitos tipo 1 ou quando se verifica a falência das células beta do pâncreas de pacientes com Diabetes Melitos tipo 2, ou no controlo da glicemia nos casos de Diabetes Melitos ...

  6. Estudio de predicción de vida a fatiga de implantes dentales de titanio y de sus principales tipos de conexiones implantoprotésicas

    OpenAIRE

    Ivorra Server, Carlos

    2017-01-01

    Tesis Doctoral leída en la Universidad Rey Juan Carlos de Madrid en 2017. Directores de la Tesis: Juan Carlos Prados Frutos y Carlos Navarro Vila Se denomina implante dental al elemento aloplástico que se aloja en el tejido óseo o debajo del periostio con la finalidad de reemplazar los dientes ausentes (Schou et al. 2000). La Academia Americana de Implantología (AAID, por sus siglas en inglés) define el implante dental como un elemento cilíndrico, fabricado generalmente de tita...

  7. Caracterización electroquímica de dos materiales de implante tipo titanio para aplicaciones en implantología oral

    OpenAIRE

    Echavarría Velásquez, Alejandro Iván; Arroyave Posada, Carlos Enrique

    2002-01-01

    Se presentan los resultados de las evaluaciones electroquímicas para dos materiales de implante certificados para uso odontológico: aleación Ti 6Al 4V (TAV) y titanio comercialmente puro (Ti) en solución de Ringer y en solución de saliva artificial, por medio de las técnicas de espectroscopia de impedancia electroquímica (EIS) y curvas de polarización potenciodinámicas (CP). Los resultados EIS mostraron que los arcos exhibidos en los diagramas de Nyquist disminuyen con el tiempo de inmersión....

  8. Projeto de EDFAs com controle automatico de ganho totalmente optico para aplicações em redes WDM

    OpenAIRE

    Julio Cesar Rodrigues Fernandes de Oliveira

    2004-01-01

    Resumo: A variação na potência da entrada em amplificadores ópticos a fibra dopada com Érbio (EDFAs) induz alterações em seu ganho. No caso de sistemas ou redes WDM onde o número de canais acoplados ao amplificador varia, o ganho torna-se dependente do número de canais que estão sendo transmitidos, especialmente se o amplificador opera saturado. Este trabalho apresenta o desenvolvimento e a avaliação experimental de uma técnica de controle de ganho totalmente óptica para EDFAs. Esta técnica d...

  9. Rotational accuracy of all-ceramic restorations on ceraone components = Liberdade rotacional de restaurações totalmente cerâmicas sobre componentes ceraone

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    Webster, Jacqueline

    2005-01-01

    Full Text Available Objetivo: Este estudo avaliou a desadaptação interna de sistemas cerâmicos em prótese sobre implantes em relação à liberdade rotacional das restaurações após várias cocções da porcelana. Materiais e métodos: Foram analisados três sistemas cerâmicos: Procera AllCeram, In-Ceram e CeraOne sobre análogo e intermediário CeraOne. A liberdade rotacional foi medida com um dispositivo acoplado a um relógio comparador em quatro tempos: fase de coifa, após aplicação do corpo da porcelana e glaze, e após duas queimas adicionais. Os dados foram analisados por testes de Friedman, de Kruskal-Wallis e de Wilcoxon, a = 0,01. Resultados: As médias de liberdade rotacional em graus foram: 0,08 para In-Ceram/Análogo; 1,64 para Procera/ Intermediário; 1,72 para CeraOne/Intermediário; 1,88 para CeraOne/Análogo e 1,97 para Procera/Análogo. O sistema In-Ceram sobre o análogo apresentou níveis de liberdade rotacional dez a vinte vezes menores que CeraOne e Procera. Não houve diferença entre as fases de confecção da restauração para In-Ceram. O comportamento de CeraOne e Procera foi similar, com aumento da liberdade rotacional sobre intermediário e análogo com a progressão da confecção da restauração. A liberdade rotacional sobre intermediário foi menor que sobre análogo. Conclusão: A liberdade rotacional variou em função da etapa do processo de fabricação dependendo do sistema totalmente cerâmico

  10. Síndrome de Crigler-Najjar tipo 2: um caso atípico = Crigler-Najjar syndrome type 2: an atypical case

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    Raposo, Filipa

    2014-01-01

    Conclusões: A síndrome de Crigler-Najjar tipo 2, embora fenotipicamente semelhante ao tipo 1, tem tratamento e prognóstico diferentes. Neste caso, a apresentação neonatal precoce e os valores de bilirrubina muito elevados, que não cediam totalmente à fototerapia intensiva, levaram inicialmente à suspeita de síndrome de Crigler-Najjar tipo 1, que é a forma mais grave. Os autores pretendem com este caso alertar para uma causa rara de icterícia, que não teve a apresentação típica

  11. TIPOS DE DISCURSO

    OpenAIRE

    Garcia, Afrânio; UERJ

    2012-01-01

    O professor Adilson Citelli, em seu excelente livro Linguageme persuasão, apresenta cinco tipos de discurso:§ discurso dominante§ discurso autorizado§ discurso polêmico,§ discurso lúdico§ discurso autoritário.

  12. The influence of screw type, alloy and cylinder position on the marginal fit of implant frameworks before and after laser welding Influência do tipo de parafuso, liga e da posição do cilindro na adaptação marginal das infra-estruturas sob implantes antes e após a soldagem a laser

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    Daniela Castilio

    2006-04-01

    ânio. OBJETIVOS: Avaliar a influência do tipo de parafuso, liga e posição do cilindro na adaptação marginal de infra-estruturas sobre implante antes e após a soldagem a laser. MÉTODOS: Após os abutments do tipo Estheticone serem aparafusados nos implantes, trinta cilindros protéticos de plástico foram montados e encerados com 15 barras cilíndricas. Cada espécime possuía três componentes protéticos interconectados. Cinco espécimes foram fundidos em monobloco com liga de titânio e liga de cobalto-crômio. Em cada espécime, os testes foram conduzidos com parafusos hexagonais de titânio e com parafusos de ouro com fenda, separadamente, num total de 30 parafusos testados. As medidas nas interfaces foram feitas com microscópio óptico com 5mm de precisão. Após o seccionamento, os espécimes foram soldados a laser e novas medidas obtidas. Os dados foram submetidos para análise com os testes ANOVA a quatro critérios e Tukey para comparações múltiplas (alfa=0,05. RESULTADOS: Os parafusos com fenda e hexágono não apresentaram diferenças significantes independente da adaptação dos cilindros fundidos em titânio, tanto em monobloco como após a soldagem a laser. Quando os parafusos com hexágono e fenda foram testados nos espécimes de cobalto-crômio, diferenças estatisticamente significantes foram encontradas na condição monobloco, com os parafusos fendidos apresentando melhor adaptação (24,13µm do que os com hexágono (27,93 µm. Além disso, nenhuma diferença significante foi encontrada após a soldagem a laser. CONCLUSÕES: 1 O uso de diferentes ligas metálicas exerce influência nos resultados, 2 Os parafusos com hexágono e fenda somente possuem o papel de fixar a prótese, e não melhoram a adaptação dos cilindros e 3 a posição do cilindro não afetou os valores de adaptação marginal.

  13. Inserción de prótesis metálicas autoexpandibles totalmente recubiertas en patología biliar benigna

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    Mariana Omodeo

    Full Text Available RESUMEN Introducción: las enfermedades biliares benignas se han tratado, tradicionalmente, mediante la colocación de prótesis plásticas. Sin embargo, en la actualidad, las prótesis metálicas autoexpandibles totalmente recubiertas están ganando aceptación para el tratamiento de dichas patologías. Objetivo: evaluar la eficacia y las complicaciones de la inserción endoscópica temporal de prótesis metálicas totalmente recubiertas para el tratamiento de patologías biliares benignas. Materiales y métodos: estudio retrospectivo y observacional realizado a partir de una base de datos prospectiva en un centro de tercer nivel entre marzo de 2012 y mayo de 2016. Se incluyeron pacientes a los que se les colocó una prótesis metálica totalmente recubierta por patología benigna de la vía biliar. Se documentaron las indicaciones, las tasas de resolución, las de éxito técnico y los eventos adversos. Resultados: se incluyeron 31 pacientes a los que se insertaron 34 prótesis. Las indicaciones fueron las siguientes: 8 (25% estenosis biliares poscolecistectomía, 11 (31% coledocolitiasis de gran tamaño o múltiple, 3 (8,3% fístulas biliares, 2 (6% estenosis postrasplante hepático, 3 (8,3% estenosis papilares, 2 (6% perforaciones y 2 (6% sangrados. La tasa de éxito global de resolución de la patológica fue del 88%: 87,5% (7/8 en estenosis poscolecistectomía, 73% (8/11 en litiasis gigante, y 100% en el resto de las indicaciones. Se retiraron mediante endoscopia 33 de las 34 tras un promedio de 133 días (rango 10-180 días. No se registraron complicaciones. Conclusión: las prótesis metálicas autoexpandibles totalmente recubiertas son una alternativa efectiva y segura en la resolución de patologías biliares benignas.

  14. Innovaciones para la elaboración de productos lácteos azucarados saludables tipo dulce de leche

    OpenAIRE

    Ranalli, Natalia

    2015-01-01

    La presente Tesis está enfocada en contribuir al desarrollo de alimentos procesados sanos y nutritivos mediante la modificación y mejora de formulaciones y procesos involucrados en la elaboración de productos lácteos azucarados tipo dulce de leche reemplazando totalmente la fase lipídica de origen bovino por aceite vegetal rico en ácidos grasos insaturados. Se buscó que dicho reemplazo mejore el perfil de ácidos grasos del producto, disminuyendo los saturados provenientes de la lech...

  15. MELLITUS TIPO 1

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    Luciana Vládia Carvalhêdo Fragoso

    2010-01-01

    Full Text Available Investigación de carácter cualitativo, con el objetivo de comprender las experiencias cotidianas de los adolescentes con diabetes tipo 1. Los sujetos del estudio son 14 adolescentes atendidos en una clínica para la diabetes en Fortaleza, Ceará, Brasil, de junio a octubre de 2008. La recolección de los datos se hizo a través de entrevistas semi-estructuradas y se organizaron de acuerdo al análisis de contenido de Morse y Field. Se observó que el descubrimiento de la diabetes fue un momento difícil para los adolescentes debido a los cambios que tuvieron que hacer como el control terapéutico. Hacer una dieta adecuada es muy difícil como consecuencia de estímulos internos y externos a que están sometidos y a las dificultades financieras. Los adolescentes tienen el apoyo de la familia y amigos para su tratamiento diario. Además, les gusta el servicio realizado por los profesionales de salud de la clínica. Sin embargo, hay mucho que mejorar como enfermeras en la valorización de las experiencias de la vida de los adolescentes con diabetes, como la identificación de factores que interfieren en el control metabólico.

  16. mellitus tipo 2

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    Margarita Lazcano-Ortiz

    2008-01-01

    Full Text Available Objetivo: valorar las propiedades psicométricas de la escala de afrontamiento y proceso de adaptación de Roy en población mexicana. Materiales y métodos: la escala se aplicó a 200 participantes con diabetes mellitus tipo 2. Para validar el constructo se realizó la extracción de factores con componentes principales y rotación Varimax, con Eigenvalores por arriba de 1 y cargas de factor mayores a ,30. Resultados: seis reactivos fueron eliminados del análisis por mostrar correlación negativa con la correlación total de la escala. El análisis de componentes principales inicial reveló nueve factores con una variación explicada de 65,29%. Sin embargo, no se consideraron tres factores por contener cada uno de ellos solamente un reactivo. Por tanto, la escala final se acepta con 38 reactivos. El coeficiente de confiabilidad Alfa de Cronbach fue de, 93. Discusión: el análisis reveló seis factores, uno más de lo reportado por Roy, y con mayor variación explicada. Algunos reactivos parecen no ser bien comprendidos por los participantes. Conclusiones: este artículo aporta una aproximación metodológica para explorar la adecuación de un instrumento a una población diferente para la que originalmente fue diseñado. Se concluye que la escala tiene consistencia interna y validez de constructo incipiente, los datos reportados en este estudio deben tomarse en cuenta con cautela. Es conveniente revisar de nuevo los reactivos y adecuarlos a la cultura particular, y probar la escala de nuevo con pacientes con enfermedades crónicas degenerativas a fin de contar con instrumentos culturalmente equivalentes.

  17. Validação de procedimentos operacionais padrão no cuidado de enfermagem de pacientes com cateter totalmente implantado

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    Rita Paiva Pereira Honório

    2011-10-01

    Full Text Available Os protocolos de assistência são recursos tecnológicos importantes na prática de saúde e devem ser validados, para adquirirem credibilidade científica na prática profissional. O objetivo desta pesquisa foi validar os itens de proposta de procedimentos operacionais padrão (POPs quanto à punção, heparinização e curativo do cateter totalmente implantado, por meio da análise de conceito proposta por Hoskins. O estudo se deu em duas etapas. Na primeira, elaborou-se um formulário para validação dos POPs. Na segunda, avaliou-se o conteúdo dos POPs por peritos. As sugestões versaram sobre reformulação da redação; acréscimo de ações, tornando-o mais claro e abrangente; a ordem dos passos dos procedimentos; e o material para a adequação do instrumento. Constatou-se a necessidade de outros estudos que direcionem os profissionais, principalmente, quanto à heparinização dos cateteres e à troca do primeiro curativo após punção, no sentido de uniformizar condutas embasadas em evidências científicas seguras.

  18. Crescimento de genótipos de frangos tipo caipira

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    R. C. Veloso

    2015-10-01

    Full Text Available RESUMOObjetivou-se com este trabalho comparar o padrão de crescimento, mediante ajustes das respectivas curvas de crescimento por modelos não lineares, bem como estudar o desenvolvimento de cortes de carcaça em relação ao peso da carcaça em diferentes genótipos de frangos tipo caipira. Foram utilizados 840 pintos de um dia, machos, distribuídos em delineamento inteiramente ao acaso, dos seguintes genótipos da linhagem Redbro: Caboclo, Carijó, Colorpak, Gigante Negro, Pesadão Vermelho, Pescoço Pelado e Tricolor. As aves foram alojadas em 28 boxes, sendo 30 aves/boxe, em galpão de alvenaria com acesso a um piquete de 45m², com quatro repetições. O peso corporal individual dos frangos foi medido ao nascer, aos 14, 28, 42, 56, 70 e 84 dias de idade. Para a determinação das curvas de crescimento do peso corporal das aves, os dados coletados foram avaliados por meio dos modelos não lineares: Brody, Gompertz, Logístico, Richards e von Bertalanffy. Foi empregado o PROC NLIN do SAS, utilizando-se o método interativo de Gauss-Newton. Os critérios usados para escolha do modelo de melhor ajuste da curva de crescimento foram o coeficiente de determinação, o desvio padrão assintótico, o desvio médio absoluto dos resíduos e o índice assintótico. As análises para obtenção dos coeficientes alométricos foram realizadas por meio do PROC GLM do SAS para os genótipos Carijó, Colorpak, Pesadão Vermelho, Pescoço Pelado e Tricolor. Foram avaliados os pesos da carcaça, do peito, das coxas, das sobrecoxas, das pernas e das asas das aves abatidas aos 85 dias de idade. Apenas as equações propostas por Gompertz, von Bertalanffy e Logístico atingiram a convergência, e o modelo proposto por von Bertalanffy foi o mais adequado para descrever o crescimento dos genótipos de frangos caipiras. Todos os cortes avaliados apresentaram crescimento tardio em relação ao peso da carcaça em genótipos de frangos tipo caipira.

  19. Estapedotomia totalmente endoscópica: técnica e resultados preliminares Fully endoscopic stapes surgery (stapedotomy: technique and preliminary results

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    João Flávio Nogueira Júnior

    2011-12-01

    Full Text Available Estapedotomias são realizadas atualmente com o auxílio de microscópios cirúrgicos. Entretanto, o uso do microscópio possui algumas limitações, podendo causar algumas complicações, como lesão no nervo corda do tímpano. Há poucos casos e nenhuma série publicada sobre a utilização de endoscópios nasossinusais na realização de estapedotomias. OBJETIVOS: a Investigar o uso do endoscópio nasossinusal em estapedotomias, com foco na visualização de estruturas importantes. b Mostrar os resultados iniciais, discutindo as possíveis vantagens e desvantagens deste instrumento. METODOLOGIA: 15 pacientes com otosclerose foram selecionados para realizar estapedotomias em 2010. Os dados e vídeo cirúrgico foram analisados retrospectivamente (estudo de série de casos. As condições anatômicas do nicho da janela oval e passos cirúrgicos foram descritos para avaliar possíveis benefícios do procedimento endoscópico. RESULTADOS: As cirurgias foram realizadas exclusivamente com endoscópios e todas as estruturas com relevância anatômica, visualizadas sem maiores dificuldades. Nenhuma complicação foi observada e 14 dos 15 pacientes referiram melhora auditiva, confirmada com exames audiológicos pós-operatórios. CONCLUSÃO: Estapedotomias totalmente endoscópicas são tecnicamente viáveis, seguras e promissoras. Nesta pequena série as principais vantagens foram: praticamente nenhum trauma no nervo corda do tímpano e excelente campo de visão. As desvantagens foram falta de visão estereoscópica, trabalho unimanual e curva de aprendizado.Stapedotomies are perfomed with the aid of surgical microscopes. However, the microscope has some limitations and may cause complications such as damage to the chorda tympani nerve. There are just a few cases and no series published on the use of sino-nasal endoscopes in stapedotomies. OBJECTIVES: a To investigate the feasibility of using sino-nasal endoscopes in stapedotomies, focusing on the

  20. Ion implantation

    International Nuclear Information System (INIS)

    Dearnaley, Geoffrey

    1975-01-01

    First, ion implantation in semiconductors is discussed: ion penetration, annealing of damage, gettering, ion implanted semiconductor devices, equipement requirements for ion implantation. The importance of channeling for ion implantation is studied. Then, some applications of ion implantation in metals are presented: study of the corrosion of metals and alloys; influence or ion implantation on the surface-friction and wear properties of metals; hyperfine interactions in implanted metals

  1. Uso de cateteres venosos totalmente implantados para nutrição parenteral: cuidados, tempo de permanência e ocorrência de complicações infecciosas Long-term central venous catheter for total parenteral nutrition: catheter care, permanence period, and incidence of infections

    Directory of Open Access Journals (Sweden)

    Maria do Rosário Del Lama de Unamuno

    2005-04-01

    Full Text Available Cateteres venosos totalmente implantados são utilizados em pacientes com síndrome do intestino curto, para realizar o suporte nutricional parenteral, o qual mantém estes pacientes vivos, pois fornece-lhes nutrientes que são absorvidos pela via digestiva. No entanto, estes cateteres não são isentos de complicações. As infecções relacionadas aos cateteres venosos são as complicações mais temidas e sua incidência varia de 3% a 20%, aumentando em pacientes mais graves. O objetivo do presente estudo é descrever as complicações infecciosas em pacientes recebendo nutrição parenteral por meio de cateteres venosos totalmente implantados. Tais cateteres são utilizados pela Divisão de Nutrição Clínica do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, para realizar o suporte nutricional parenteral em pacientes submetidos a ressecções extensas de intestino delgado. Foram avaliadas as complicações infecciosas ocorridas com 21 cateteres, implantados em 16 pacientes. O tempo de permanência dos cateteres foi de 768±664,3 dias (mediana 529 dias e a taxa de infecção foi de 0,029 infecções/paciente/ano, resultados que se comparam às taxas de infecção observadas em países desenvolvidos. Concluiu-se que os cuidados observados no manuseio destes cateteres foram de fundamental importância para diminuir a incidência de infecção nestes pacientes.Long-term venous catheters are used for the total parenteral nutrition infusion, which is essential for feeding short-bowel syndrome patients. However, complications are likely to occur. The incidence of catheter related infections ranges from 3 to 20% in hospitalized patients. The Divisão de Nutrição Clínica do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Brazil, has been providing nutrition support to short-bowel syndrome patients, using totally implantable venous catheters. This is a

  2. Cochlear Implants

    Science.gov (United States)

    ... implant, including: • How long a person has been deaf, •The number of surviving auditory nerve fibers, and • ... Implant, Severe Sensoryneurial Hearing Loss Get Involved Professional Development Practice Management ENT Careers Marketplace Privacy Policy Terms ...

  3. Miragel implant, apropos of 3 cases

    OpenAIRE

    Rodríguez Rodríguez, Beatriz; García Ferrer, Laine; Cheong Quiala, Mayelin; Gallar Gutiérrez, Yolescy; Pozo Correa, Susel

    2013-01-01

    Se exponen las consecuencias a largo plazo del uso del implante de miragel como tratamiento del desprendimiento de retina. Se presentan las características durante la cirugía y el postoperatorio de la explantación de este tipo de implante en 3 pacientes que acudieron a la consulta de Retina del Hospital Oftalmológico «Amistad Argelia Cuba» en Djelfa, Republica Popular y Democrática de Argelia, con el diagnóstico de cirugía convencional de retina con implante de miragel realizado en Francia en...

  4. Catarata e diabetes mellitus tipo 1

    OpenAIRE

    Pizzol,Melissa Manfroi Dal; Esteves,Jorge Freita; Sccoco,Caio Augusto; Roggia,Murilo Felix; Rosa,Carolina Maurente da; Lambert,José Humberto Franco; Canani,Luís Henrique

    2008-01-01

    OBJETIVO: Avaliar a prevalência de catarata e seus fatores de risco em uma população portadora de diabetes mellitus tipo 1 (DM1). MÉTODOS: Estudo de casos e controles de um banco de dados de 181 pacientes (362 olhos) com diagnóstico de diabetes mellitus tipo 1. Os pacientes foram classificados como casos quando apresentavam diagnóstico de catarata. As variáveis estudadas foram a presença ou não de retinopatia diabética, tratamento com panfotocoagulação, presença de hipertensão arterial sistêm...

  5. Ion implantation

    International Nuclear Information System (INIS)

    Johnson, E.

    1986-01-01

    It is the purpose of the present paper to give a review of surface alloy processing by ion implantation. However, rather than covering this vast subject as a whole, the survey is confined to a presentation of the microstructures that can be found in metal surfaces after ion implantation. The presentation is limited to alloys processed by ion implantation proper, that is to processes in which the alloy compositions are altered significantly by direct injection of the implanted ions. The review is introduced by a presentation of the processes taking place during development of the fundamental event in ion implantation - the collision cascade, followed by a summary of the various microstructures which can be formed after ion implantation into metals. This is compared with the variability of microstructures that can be achieved by rapid solidification processing. The microstructures are subsequently discussed in the light of the processes which, as the implantations proceed, take place during and immediately after formation of the individual collision cascades. These collision cascades define the volumes inside which individual ions are slowed down in the implanted targets. They are not only centres for vigorous agitation but also the sources for formation of excess concentrations of point defects, which will influence development of particular microstructures. A final section presents a selection of specific structures which have been observed in different alloy systems. (orig./GSCH)

  6. Ataxia espinocerebelar tipo 6: relato de caso

    Directory of Open Access Journals (Sweden)

    Bianca Simone Zeigelboim

    2014-10-01

    Full Text Available O objetivo deste estudo foi verificar as alterações vestibulococleares observadas em um caso de ataxia espinocerebelar tipo 6. O caso foi encaminhado do Hospital de Clínicas para o Laboratório de Otoneurologia de uma Instituição de Ensino e foi submetido aos seguintes procedimentos: anamnese, inspeção otológica, avaliações audiológica e vestibular. O caso retrata uma paciente com diagnóstico genético de ataxia espinocerebelar tipo 6, do sexo feminino, com 57 anos de idade, que referiu desequilíbrio à marcha com tendência a queda para a esquerda, disartria e disfonia. Na avaliação audiológica apresentou configuração audiométrica descendente a partir da frequência de 4kHz e curva timpanométrica do tipo "A" com presença dos reflexos estapedianos bilateralmente. No exame vestibular observou-se na pesquisa da vertigem posicional presença de nistagmo vertical inferior e oblíquo, espontâneo e semiespontâneo múltiplo com características centrais (ausência de latência, paroxismo, fatigabilidade e vertigem, nistagmooptocinético abolido e hiporreflexia à prova calórica. Constataram-se alterações labirínticas que indicaram afecção do sistema vestibular central evidenciando-se a importância dessa avaliação. A existência da possível relação entre os achados com os sintomas vestibulares apresentados pela paciente apontou a relevância do exame labiríntico neste tipo de ataxia uma vez que a presença do nistagmo vertical inferior demonstrou ser frequente neste tipo de patologia.

  7. Carmustine Implant

    Science.gov (United States)

    ... works by slowing or stopping the growth of cancer cells in your body. ... are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while receiving carmustine implant, call your doctor. Carmustine may harm the fetus.

  8. Cochlear Implants

    Science.gov (United States)

    ... NIDCD A cochlear implant is a small, complex electronic device that can help to provide a sense ... Hearing Aids Retinitis Pigmentosa - National Eye Institute Telecommunications Relay Services Usher Syndrome Your Baby's Hearing Screening News ...

  9. 74. Reparación Con Neocuerdas en Distintos Tipos de Prolapso Mitral

    OpenAIRE

    R. García Fuster; A. García; E. Martín; F. Paredes; R. Payá; J. Fontana

    2012-01-01

    la resección cuadrangular es referente en la reparación del prolapso de velo posterior. El velo anterior plantea más limitaciones, siendo la transposición de cuerdas y el implante de neocuerdas los procedimientos más empleados. Analizamos eficacia y versatilidad de la reparación con neocuerdas en cinco variantes de prolapso mitral (vídeo). Material y métodos: han sido intervenidos 5 pacientes con distintos tipos de prolapso. Tres con deficiencia fibroelástica: varón de 52 años con prolapso...

  10. Divergência genética entre genótipos de frangos tipo caipira

    Directory of Open Access Journals (Sweden)

    R. C. Veloso

    2015-10-01

    Full Text Available RESUMOObjetivou-se com este trabalho verificar a divergência genética entre sete genótipos de frangos tipo caipira da linhagem Redbro utilizando as características de desempenho por meio de técnicas de análise multivariada. Foram utilizados 840 pintos de um dia, machos, distribuídos em delineamento inteiramente ao acaso, dos seguintes genótipos: Caboclo, Carijó, Colorpak, Gigante Negro, Pesadão Vermelho, Pescoço Pelado e Tricolor. Após a consistência dos dados, foram avaliadas as seguintes variáveis: ganho em peso médio diário, consumo de ração médio diário e conversão alimentar, para os períodos: 1 a 28, 1 a 56, 1 a 70 e 1 a 84 dias de idade; peso corporal ao nascimento, aos 28, 56, 70 e aos 84 dias de idade. O desempenho dos genótipos foi avaliado por meio da análise de variância multivariada e da função discriminante linear de Fisher, usando os testes do maior autovalor de Roy e da união-interseção de Roy para as comparações múltiplas. O estudo da divergência genética foi feito por meio da análise por variáveis canônicas e pelo método de otimização de Tocher. Os genótipos Caboclo e Gigante Negro apresentaram médias canônicas diferentes dos demais genótipos. As duas primeiras variáveis canônicas explicaram 97,41% da variação entre os genótipos. A divergência genética entre os genótipos avaliados permitiu a formação de quatro grupos com os seguintes genótipos: grupo 1 - Colorpak; grupo 2 - Pesadão Vermelho e Pescoço Pelado; grupo 3 - Carijó e Tricolor; e grupo 4 - Caboclo e Gigante Negro.

  11. Implantation, recoil implantation, and sputtering

    International Nuclear Information System (INIS)

    Kelly, R.

    1984-01-01

    The implantation and sputtering mechanisms which are relevant to ion bombardment of surfaces are described. These are: collision, thermal, electronic and photon-induced sputtering. 135 refs.; 36 figs.; 9 tabs

  12. Hip Implant Systems

    Science.gov (United States)

    ... Implants and Prosthetics Metal-on-Metal Hip Implants Hip Implants Share Tweet Linkedin Pin it More sharing options Linkedin Pin it Email Print Hip implants are medical devices intended to restore mobility ...

  13. Breast reconstruction - implants

    Science.gov (United States)

    Breast implants surgery; Mastectomy - breast reconstruction with implants; Breast cancer - breast reconstruction with implants ... harder to find a tumor if your breast cancer comes back. Getting breast implants does not take as long as breast reconstruction ...

  14. Use of fully covered self-expanding metal stents for the management of benign biliary conditions Utilización de prótesis metálicas autoexpandibles totalmente recubiertas en procesos biliares benignos

    Directory of Open Access Journals (Sweden)

    J. García-Cano

    2010-09-01

    pequeños y proporcionar, al abrirse completamente, diámetros grandes para el drenaje biliar. Su utilización en procesos benignos ha estado muy limitada, fundamentalmente por la dificultad en su extracción. Presentamos nuestra experiencia inicial con una PMAB totalmente recubierta (Wallflex para tratar patología benigna de la vía biliar. Pacientes y métodos: en un estudio descriptivo prospectivo se insertaron por CPRE prótesis de 8 mm de diámetro y 4, 6 u 8 cm de longitud, cuando se consideró que para el drenaje biliar eran precisos diámetros superiores a 10 french (3,3 mm. Las prótesis se retiraron también por endoscopia varios meses después según se consideró oportuno clínicamente. Resultados: se insertaron 20 PMAB. Los motivos fueron: gran fístula biliar intrahepática tras cirugía de quiste hidatídico (1, perforación del área papilar por esfinterotomía endoscópica (2, recanalización de prótesis no recubiertas insertadas en procesos benignos (3, estenosis benignas (7, coledocolitiasis múltiples y de gran tamaño con afilamiento-estenosis del colédoco distal que no pudieron extraerse (7. En todos los casos se logró un drenaje biliar satisfactorio y no se produjeron complicaciones por la inserción. Las prótesis se extrajeron con facilidad a los 132 días de media (36-270. La resolución completa de los procesos se obtuvo en 14 pacientes (70%. Conclusiones: en nuestra experiencia inicial, la prótesis Wallflex biliar totalmente recubierta pudo extraerse sin complicaciones tras permanecer en el colédoco hasta una media de más cuatro meses, por lo que podría utilizarse en el tratamiento de procesos biliares benignos.

  15. Rehabilitación sobre implantes oseointegrados A case with rehabilitation on boneintegrated implants

    Directory of Open Access Journals (Sweden)

    Leticia María Lemus Cruz

    2009-03-01

    Full Text Available Se presenta un caso de un paciente rehabilitado en la consulta de Implantología de la Facultad de Estomatología de Ciudad de La Habana. La historia de la implantología moderna se remonta a principios de los años 60, cuando Per-Ingvar Branemark sienta las bases de la osteointegración y describe los primeros implantes de titanio con forma de tornillo. Aunque antigua, es la prótesis más moderna. Si la meticulosidad es obligada en la elaboración de todo tipo de prótesis, en los trabajos de implantes no se admite el más mínimo fallo, desde la planificación del caso hasta la implantación de la prótesis en boca. Para obtener buenos resultados, las técnicas y los procesos han de observarse escrupulosamente. En nuestra Facultad se ha creado el Grupo de Implantología, que es el encargado de la colocación de implantes y la rehabilitación prótesica de estos. Para ello han sido utilizado diferentes tipos de implantes comercializados y patentizados al nivel mundial. Se reafirma que la rehabilitación sobre implantes mejora la calidad estética y funcional de los pacientes.A case of rehabilitation patient is presented seen in Implantation Science consulting room of Stomatology Faculty of Havana City. History of implantation science dates back to at the beginning of 60s, when Per-Ingvar Branemark creates the bases of bone-integration and to describe the firsts titanium implants in a screw form. Although ancient, it is the more modern prosthesis. If meticulousness if mandatory in elaboration of all type of prosthesis, in implants works it inadmissible the minimum of failure, from the case planning until prosthesis implantation in mouth. To achieve good results, techniques and processes has to be scrupulously observed. In our Faculty it has been created a group of Implantation Science, which is in charge of implants placement, and of the prosthetic rehabilitation of these. Thus, we used different types of marketed and showed at world level. It

  16. Diabetes tipo II e resolvinas D1

    OpenAIRE

    Silva, Isabel Alexandra Marques Batista da

    2015-01-01

    Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz A diabetes é um problema de saúde pública crescente com o envelhecimento da população, os maus hábitos alimentares e o sedentarismo. A obesidade poderá ser causa ou consequência da diabetes tipo II, sendo também um problema crescente de saúde pública. Esta monografia tem como objetivo estudar, com base no conhecimento atual, se as resolvinas D1 são uma alternativa viável na terapêutica da diab...

  17. Fully covered self-expanding metal stents in the management of difficult common bile duct stones Prótesis metálicas autoexpandibles totalmente recubiertas en el tratamiento de coledocolitiasis difíciles

    Directory of Open Access Journals (Sweden)

    Jesús García-Cano

    2013-01-01

    Full Text Available Background and objectives: plastic biliary stents are often used after an ERCP session without complete common bile duct stones (CBDS extraction. Sometimes, the volume of biliary drainage with these stents may be insufficient. We present our experience with the use of fully covered self-expanding metal stents (FCSEMS in the setting of incomplete CBDS extraction. Patients and methods: after an ERCP session with difficult CBDS not completely removed, biliary FCSEMS (Wallflex were inserted in some patients when it was deemed that biliary sphincterotomy and a single plastic stent would not provide an adequate drainage. Results: a retrospective study was performed. Biliary FCSEMS were inserted in 29 patients, mean age 81 years. CBDS could not be extracted through a biliary sphincterotomy due to its large size (n = 18 or because of the presence of inflammatory distal strictures (n = 11. The greatest biliary drainage with shortest ERCP time was considered mandatory due to clinical instability of patients and/or poor tolerance to conscious sedation administered by the endoscopist. Successful biliary drainage was obtained in all cases. FCSEMS were removed after a median of 199.5 days in 16 patients with a complete CBDS extraction in 15 (93.7%. FCSEMS were not removed in the remaining 13 patients due to their clinical condition, and a wait-and-see strategy was undertaken. Conclusions: in selected cases, utilization of removable FCSEMS can be a good option for a quick and adequate biliary drainage in the setting of difficult CBDS. Because of the higher cost of these stents its use needs to be individualized.Introducción y objetivos: las prótesis biliares plásticas suelen emplearse tras una sesión de CPRE sin extracción completa de coledocolitiasis. En ocasiones, el calibre de drenaje con estas prótesis puede ser insuficiente. Presentamos nuestra experiencia en la utilización de prótesis metálicas autoexpandibles totalmente recubiertas (PMATR en

  18. Estereótipos e mulheres na cultura marroquina

    OpenAIRE

    Sadiqi,Fatima

    2008-01-01

    Estereótipos sobre as mulheres no Marrocos podem ser caracterizados como crenças culturais incompletas e inexatas mantidas por algumas pessoas e que se encontram inscritos em expressões lingüísticas ou em discursos subliminares. A cultura popular marroquina emprega representações poderosas para transmitir e sustentar tais estereótipos. Embora existam alguns estereótipos positivos, a maioria dos estereótipos sobre as mulheres no Marrocos é negativa e reflete ditames patriarcais subliminares qu...

  19. Alternativas a la elevación de seno maxilar: implantes cortos Alternatives to maxillary sinus elevation: short implants

    Directory of Open Access Journals (Sweden)

    J. González Lagunas

    2008-12-01

    Full Text Available La mala calidad del hueso, reabsorciones extremas y la presencia de la cavidad del seno maxilar constituían obstáculos insalvables para la rehabilitación implanto-soportada en el sector posterior del maxilar atrófico. La elevación de seno es probablemente la primera opción de tratamiento en el paciente tributario de rehabilitación con implantes en ese sector. El uso de implantes cortos (menos de 10 mm se ha asociado tradicionalmente con unas tasas de supervivencia menores que la de los implantes largos. No obstante la aparición de nuevas superficies y diseños indican que este tipo de implantes puede soportar de forma fiable restauraciones dentales. Presentamos la técnica de instalación de implantes de superficie porosa sinterizada, asi como una revisión actualizada sobre el comportamiento de los implantes cortos.Poor bone quality, extreme bony resorption and a pneumatized mqxillary sinus are a severe Challenger for reconstruction of the atrophic edentuous posterior maxilla. Sinus lift is probably the gold standard for Management of that area. Short implants (<10mm have traditionally been associated with lower survival rates. The introduction of new surfaces and designs indicate that this type of implants can adequately support dental restorations. We present the technique of installation of sinterised porous dental implants together with an update on the behaviour of short implants.

  20. Short Implants: New Horizon in Implant Dentistry.

    Science.gov (United States)

    Jain, Neha; Gulati, Manisha; Garg, Meenu; Pathak, Chetan

    2016-09-01

    The choice of implant length is an essential factor in deciding the survival rates of these implants and the overall success of the prosthesis. Placing an implant in the posterior part of the maxilla and mandible has always been very critical due to poor bone quality and quantity. Long implants can be placed in association with complex surgical procedures such as sinus lift and bone augmentation. These techniques are associated with higher cost, increased treatment time and greater morbidity. Hence, there is need for a less invasive treatment option in areas of poor bone quantity and quality. Data related to survival rates of short implants, their design and prosthetic considerations has been compiled and structured in this manuscript with emphasis on the indications, advantages of short implants and critical biomechanical factors to be taken into consideration when choosing to place them. Studies have shown that comparable success rates can be achieved with short implants as those with long implants by decreasing the lateral forces to the prosthesis, eliminating cantilevers, increasing implant surface area and improving implant to abutment connection. Short implants can be considered as an effective treatment alternative in resorbed ridges. Short implants can be considered as a viable treatment option in atrophic ridge cases in order to avoid complex surgical procedures required to place long implants. With improvement in the implant surface geometry and surface texture, there is an increase in the bone implant contact area which provides a good primary stability during osseo-integration.

  1. Implantation, recoil implantation, and sputtering

    International Nuclear Information System (INIS)

    Kelly, R.

    1984-01-01

    Underlying ion-beam modification of surfaces is the more basic subject of particle-surface interaction. The ideas can be grouped into forward and backward features, i.e. those affecting the interior of the target and those leading to particle expulsion. Forward effects include the stopping of the incident particles and the deposition of energy, both governed by integral equations which are easily set up but difficult to solve. Closely related is recoil implantation where emphasis is placed not on the stopping of the incident particles but on their interaction with target atoms with resulting implantation of these atoms. Backward effects, all of which are denoted as sputtering, are in general either of collisional, thermal, electronic, or exfoliational origin. (Auth.)

  2. Comprometimento medular por linfoma tipo Burkitt: relato de um caso

    Directory of Open Access Journals (Sweden)

    Murillo Côrtes Drummond

    1985-06-01

    Full Text Available Registro de caso de linfoma tipo Burkitt com comprometimento intrarraqueano em criança de três anos de idade. Considerações sobre esse tipo de tumor são feitas em função do caso observado e de dados da literatura.

  3. Dental Implant Surgery

    Science.gov (United States)

    ... here to find out more. Dental Implant Surgery Dental Implant Surgery Dental implant surgery is, of course, ... to find out more. Wisdom Teeth Management Wisdom Teeth Management An impacted wisdom tooth can damage neighboring ...

  4. 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.

  5. Lesao óssea em leucemias agudas linfoblásticas tipo T e TIPO nao T / nao B

    OpenAIRE

    Martins, Fernando Lopes

    2013-01-01

    Resumo: O AUTOR APRESENTA OS RESULTADOS DO ESTUDO RADIOLÓGICO DE ESQUELETO DE 61 PACIENTES PORTADORES DE LEUCEMIA AGUDA LINFOBLÁSTICA, CORRELACIONANDO A PRESENÇA OU NÃO DE Lesões ÓSSEAS COM A CLASSIFICAÇÃO IMUNOLÓGICA DE LAL TIPO T E TIPO não T / não B

  6. Identificación radiográfica de implantes dentales

    OpenAIRE

    Insua Brandariz, Ángel

    2012-01-01

    La identificación de implantes dentales en pacientes sin registros clínicos representa un problema importante y creciente debido a la movilidad de la población, al incremento del número de implantes colocados, así como al aumento del número de diseños y sistemas de implantes. Objetivos 1. Crear la primera base de datos donde se describan las características morfo-radiográficas de todos los tipos de implantes dentales. 2. Identificar morfológica y radiográficamente los implan...

  7. Tipos especiales de niños

    Directory of Open Access Journals (Sweden)

    Mercedes Rodrigo Bellido

    1946-09-01

    Full Text Available En las tres últimas lecciones han sido expuestas algunas consideraciones referentes a niños y adolescentes desde el nacimiento hasta el dintel de la juventud. En todas ellas hemos procurado poner de relieve la necesidad de individualizar el conocimiento de cada niño para obtener mejores resultados en su adaptación a su futura vida de adultos, En todas ellas  nos hemos referido al llamado niño normal. Nos corresponde en la lección de hoy ocuparnos can la superficialidad característica de estas charlas tipo-muestrario, de otras categorías de niños muy dignos de interés.. quienes unas por exceso, otros por defecto, otros por dificultades de adaptación por diferentes causas, se desvían de la línea media de la normalidad. Consideramos que no está fuera del lugar, aquí, el tema de los niños excepcionales y por el contrario que es necesario intensificar el estudio de los trastornos de la vida mental y emocional de los niños en la preparación de los estudiantes de Medicina. Y no es nuestra solo esta opinión; no hace mucho tiempo en la Medical School de Ia Universidad de Minnessota hemos sabido que se ha hecho un intento de considerar y evaluar factores emocionales ambientales sobre las mismas bases que los descubrimientos fisiológicos.

  8. 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...

  9. Nuevo tipo de apoyos y articulaciones

    Directory of Open Access Journals (Sweden)

    Andrä, Fritz Leonhardt

    1963-11-01

    of theoretical and technical difficulties inherent in these bearings: they also express acknowledgement to German individuals and institutions, for their contribution to this investigation.Las tendencias actuales son funciones que dependen directamente de la presencia creciente y mejorada de los materiales de construcción que se ofrecen al comercio. En el campo de los materiales cabe una marcada subdivisión en naturales y preparados o sintéticos; estos últimos constituyen la preocupación de los autores para su aprovechamiento y adecuada aplicación. De entre ellos, las resinas sintéticas o caucho artificial, dentro de las distintas especies de la extensa familia han gozado de un lugar preferente en este estudio de nuevos tipos de apoyos que presentan los notables ingenieros alemanes Wolfhart Andrä y Fritz Leonhardt. En los ensayos de laboratorio y a escala natural, las variedades comerciales de estas resinas, conocidas con los nombres de «neopreno» y «Teflon», han sido elegidas por presentar, por lo menos actualmente, características marcadamente apropiadas a la finalidad perseguida en este estudio, del que se confía ulterior desarrollo y mejor acogida, por las importantes aplicaciones que de él se derivan en el campo de la ingeniería y construcción. Los autores estudian con detenimiento y sobrado rigor para las aplicaciones prácticas las deformaciones que de estos materiales se espera al someterlos a fuerzas de gran concentración. En los apoyos juega particular interés la distribución de la carga siempre concentrada en superficies relativamente pequeñas, lo que exige elevadas cargas unitarias y, con ello, la utilización de materiales extremadamente nobles para resistirlas con la resistencia que las deformaciones instantáneas requieren para recobrar rápidamente la posición de estabilidad perdida momentáneamente. La fatiga en el ciclo de deformaciones relaja los materiales, y ha de tenerse presente al considerar las características que los

  10. OTROS TIPOS ESPECÍFICOS DE DIABETES MELLITUS

    Directory of Open Access Journals (Sweden)

    DRA. M. Gabriela Sanzana G.

    2016-03-01

    En las “Diabetes Atípicas” (no incluidas en la clasificación ADA, se mencionan la DM tipo 2 en niños y adolescentes, favorecida por el aumento de la obesidad y del sedentarismo; la diabetes propensa a la cetosis, que debutan en cetoacidosis, con etiopatogenia y evolución de DM2; los Latent Autoinmune Diabetes of Adults (LADA, DM tipo 1 de lenta aparición y la diabetes postrasplante.

  11. 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.

  12. Individual titanium zygomatic implant

    Science.gov (United States)

    Nekhoroshev, M. V.; Ryabov, K. N.; Avdeev, E. V.

    2018-03-01

    Custom individual implants for the reconstruction of craniofacial defects have gained importance due to better qualitative characteristics over their generic counterparts – plates, which should be bent according to patient needs. The Additive Manufacturing of individual implants allows reducing cost and improving quality of implants. In this paper, the authors describe design of zygomatic implant models based on computed tomography (CT) data. The fabrication of the implants will be carried out with 3D printing by selective laser melting machine SLM 280HL.

  13. Método predictivo de volatilidad tipo cambio

    Directory of Open Access Journals (Sweden)

    Jeffrey Viales Abellán

    2011-01-01

    Full Text Available Las series temporales descritas por precios de ciertos activos financieros tales como el de las acciones y divisas presentan dos principales características, excesos de kurtosis y clustering de volatilidad. Para recoger estas características se han utilizado modelos no lineales tales como los modelos Garch o Volatilidad Condicionada y los modelos de Volatilidad Estocástica, ambos tipos de modelo son empleados para la gestión del riesgo cambiario a corto plazo; el primer tipo de modelos definen la volatilidad en función de la misma volatilidad rezagada y de los shocks (innovaciones de volatilidad; el segundo tipo de modelos son similares a los modelos Garch con la variante de que la volatilidad incluye por si misma un término aleatorio de tipo proceso Wienner2; estos modelos son empleados para simular caminatas aleatorias del tipo de cambio con volatilidades simuladas por las ecuación estocásticas de volatilidad.En el presente trabajo se analizará el desempeño del modelo Garch en comparación a las medidas de volatilidad utilizadas actualmente para la gestión del riesgo cambiario; sus implicaciones para la gestión de riesgos.

  14. 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 ...

  15. Intercavitary implants dosage calculation

    International Nuclear Information System (INIS)

    Rehder, B.P.

    The use of spacial geometry peculiar to each treatment for the attainment of intercavitary and intersticial implants dosage calculation is presented. The study is made in patients with intercavitary implants by applying a modified Manchester technique [pt

  16. La Planta única como tipo resistente a la escala

    OpenAIRE

    Colmenares Vilata, Silvia

    2014-01-01

    El sistema capitalista ha generado dos de los modelos espaciales de indiferencia funcional más extremos: por un lado, el espacio tecnificado y repetido del edificio de oficinas en altura, encarnado por la ?planta tipo? y, por otro, el espacio diáfano y extenso del gran contendor, que responde a la lógica de lo que llamaremos ?planta única?. En los edificios construidos para la industria automovilística y bélica americana se encuentra el germen de un tipo que servirá de modelo para los nuevos ...

  17. 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

  18. Reação de resistência tipo I e tipo II a Giberela em cultivares de trigo

    Directory of Open Access Journals (Sweden)

    Rafael Hansen Alves

    2013-09-01

    Full Text Available O objetivo deste trabalho foi avaliar as reações de resistência tipo I e tipo II à giberela em 28 cultivares de trigo em casa de vegetação. A inoculação de Fusarium graminearum foi realizada no estádio de florescimento. Para a resistência tipo I, a avaliação foi feita 21 dias após a inoculação. Foi determinada a severidade no estádio de espiga seca e a porcentagem de grãos giberelados. A avaliação da severidade foi feita pela porcentagem de espiguetas infectadas, no estádio de espiga verde atribuindo-se uma nota em uma escala linear de zero (nenhuma infecção a 100 (100% de espiguetas infectadas. Para a resistência tipo II, as avaliações foram realizadas aos 7, 14 e 21 dias após a inoculação, contando-se as espiguetas com sintomas da doença, excluindo as duas espiguetas que foram inoculadas. As cultivares Frontana, BRS 177, BRS 179, BRS Umbu, BRS Camboim, Abalone, Ônix, Pampeano e Fundacep 30 apresentaram menor severidade da doença e menor porcentagem de grãos giberelados, demonstrando serem fontes de resistência tipo I. As cultivares BRS Guamirim, CD 120, Onix, Rubi, Fundacep 50, BRS 179, Pampeano, Abalone, CD 114, IPR 85, Safira, BRS Louro, CD 117, CDF 2002116, CD 115, BRS 177, CD 0529 e BRS Camboim apresentaram a menor área abaixo da curva de progresso da doença, demonstrando a presença da resistência do tipo II.

  19. Tipos de pasteurização e agentes coagulantes na fabricação do queijo tipo prato

    OpenAIRE

    Ramos, Thaís de Melo

    2013-01-01

    O presente trabalho foi realizado com os objetivos de avaliar a influência do tipo de pasteurização pelos sistemas de aquecimento indireto high temperature short time, ou HTST, e injeção direta de vapor (IDV), e avaliar a influência de duas diferentes enzimas coagulantes na fabricação do queijo tipo prato. O delineamento experimental utilizado neste experimento foi um fatorial 2 x 2 x 5 inteiramente casualizado, sendo dois sistemas de pasteurização (HTST e IDV), duas enzimas coagulantes e cin...

  20. Diabetes mellitus tipo 2 y osteoartritis primaria de rodilla

    Directory of Open Access Journals (Sweden)

    Rubén Daniel Arellano-Pérez Vertti

    2017-07-01

    Full Text Available Señor editor: Es nuestro interés dar a conocer los resultados del estudio sobre la asociación entre diabetes tipo 2 y osteoartritis primaria de rodilla en una población del norte de México.

  1. Trends in cochlear implants.

    Science.gov (United States)

    Zeng, Fan-Gang

    2004-01-01

    More than 60,000 people worldwide use cochlear implants as a means to restore functional hearing. Although individual performance variability is still high, an average implant user can talk on the phone in a quiet environment. Cochlear-implant research has also matured as a field, as evidenced by the exponential growth in both the patient population and scientific publication. The present report examines current issues related to audiologic, clinical, engineering, anatomic, and physiologic aspects of cochlear implants, focusing on their psychophysical, speech, music, and cognitive performance. This report also forecasts clinical and research trends related to presurgical evaluation, fitting protocols, signal processing, and postsurgical rehabilitation in cochlear implants. Finally, a future landscape in amplification is presented that requires a unique, yet complementary, contribution from hearing aids, middle ear implants, and cochlear implants to achieve a total solution to the entire spectrum of hearing loss treatment and management.

  2. Benefits and Risks of Cochlear Implants

    Science.gov (United States)

    ... and Medical Procedures Implants and Prosthetics Cochlear Implants Benefits and Risks of Cochlear Implants Share Tweet Linkedin ... the Use of Cochlear Implants What are the Benefits of Cochlear Implants? For people with implants: Hearing ...

  3. CARACTERIZAÇÃO PÓS-COLHEITA E SENSORIAL DE GENÓTIPOS DE BANANEIRAS TIPO PRATA

    Directory of Open Access Journals (Sweden)

    ARIANE CASTRICINI

    2015-03-01

    Full Text Available RESUMO O norte de Minas Gerais é grande produtor de banana ‘Prata-Anã’ irrigada, cultura altamente suscetível ao Mal-do-Panamá. O uso de genótipos resistentes é uma alternativa, mas os frutos devem apresentar características pós-colheita o mais próximo possível da ‘Prata-Anã’, para melhor aceitação pelos consumidores. O objetivo do trabalho foi caracterizar frutos em pós-colheita, identificar a preferência e a intenção de compra de diferentes genótipos de bananeira tipo Prata. Os genótipos Prata-Anã, BRS Platina e Fhia-18. foram caracterizados no ponto de colheita (verdes e maduros (estádio seis de maturação, por avaliações químicas, físicas e sensoriais. Quando verde, ‘BRS Platina’ apresentou maior massa fresca e tamanho que ‘Fhia-18’ e ‘Prata-Anã’. ‘Fhia-18.’ teve a tonalidade verde da casca mais intensa que a dos demais genótipos. Madura, ‘BRS Platina’ foi mais firme, mas com a mesma resistência ao despencamento que ‘Fhia-18’ e superior à ‘Prata-Anã’. ‘Fhia-18’ apresentou cor da casca com amarelo mais clara e tão brilhante quanto da ‘Prata-Anã’, mas ‘BRS Platina’ teve a tonalidade de amarelo mais intensa. Bananas ‘Fhia-18’ foram mais ácidas, ‘BRS Platina’, com menor acidez titulável, e ‘Prata-Anã’, o maior teor de sólidos solúveis. Os genótipos Prata-Anã e BRS Platina tiveram maior preferência e intenção de compra pelos consumidores, sendo as bananas ‘Prata-Anã’ em dedos e ‘BRS Platina’ e ‘Fhia-18’ em dedos, buquê e penca, as mais preferidas. Entretanto, a maioria compraria bananas ‘Prata-Anã’ em buquê e ‘BRS Platina’ e ‘Fhia-18’ em penca. Enquanto verdes, os genótipos foram semelhantes à ‘Prata-Anã’, e maiores diferenças químicas e físicas ocorreram quando maduros.

  4. Parâmetros de desempenho e carcaça de genótipos de frangos tipo caipira

    Directory of Open Access Journals (Sweden)

    R.C. Veloso

    2014-08-01

    Full Text Available Objetivou-se com este trabalho avaliar as características de desempenho e de carcaça de sete genótipos de frangos tipo caipira da linhagem Redbro. Foram utilizados 840 pintos de um dia, machos, distribuídos em delineamento inteiramente ao acaso, dos seguintes genótipos: Caboclo, Carijó, Colorpak, Gigante Negro, Pesadão Vermelho, Pescoço Pelado e Tricolor. Os frangos foram alojados em 28 boxes, sendo 30 frangos por boxe, em galpão de alvenaria com acesso a um piquete de 45m², em quatro repetições. As características de desempenho (conversão alimentar, ganho em peso médio diário, consumo de ração médio diário foram avaliadas nos períodos: um a 28, um a 56, um a 70 e um a 84 dias de idade. O peso corporal foi avaliado aos 28, 56, 70 e 84 dias de idade. As características de carcaça (peso e rendimento de carcaça, peito e pernas foram obtidas a partir do abate de dois frangos por boxe, aos 85 dias de idade. As análises estatísticas foram realizadas utilizando-se o "proc glm" do SAS. Verificou-se que, em todos os períodos, os frangos do genótipo Colorpak apresentaram maior peso corporal, consumo de ração médio diário, ganho em peso médio diário e melhor conversão alimentar. Entretanto, os genótipos Caboclo e Gigante Negro apresentaram menores consumo de ração médio diário, ganho de peso médio diário e pior conversão alimentar. Quanto ao rendimento de cortes, observou-se que os genótipos Caboclo e Gigante Negro apresentaram os menores valores, e o Carijó, Colorpak, Pesadão Vermelho, Pescoço Pelado e Tricolor obtiveram os melhores rendimentos de pernas. Para o rendimento de peito, o Carijó e o Pesadão Vermelho obtiveram os maiores valores. A escolha do genótipo deve ser feita de acordo com o interesse do mercado, pois há diferenças no desempenho e no rendimento de carcaça e dos cortes.

  5. Optical effects of ion implantation

    International Nuclear Information System (INIS)

    Townsend, P.D.

    1987-01-01

    The review concerns the effects of ion implantation that specifically relate to the optical properties of insulators. Topics which are reviewed include: ion implantation, ion range and damage distributions, colour centre production by ion implantation, high dose ion implantation, and applications for integrated optics. Numerous examples are presented of both diagnostic and industrial examples of ion implantation effects in insulators. (U.K.)

  6. Riesgo de tipo de cambio: cobertura con instrumentos financieros

    OpenAIRE

    Gutiérrez Blanco, Vidal

    2017-01-01

    RESUMEN: En el siguiente trabajo se hace una pequeña aproximación al mercado de divisas, explicando qué es el tipo de cambio y cuál es el riesgo que conlleva operar con monedas de diferentes países. En primer lugar, se define el mercado de divisas, poniendo énfasis sobre el hecho de que es el mercado más grande y líquido del mundo, y se identifican cuáles son las principales operaciones llevadas a cabo en este mercado. Seguidamente, se ha explicado lo que es el tipo de cambio, cuáles son l...

  7. Ion implantation in semiconductors

    International Nuclear Information System (INIS)

    Gusev, V.; Gusevova, M.

    1980-01-01

    The historical development is described of the method of ion implantation, the physical research of the method, its technological solution and practical uses. The method is universally applicable, allows the implantation of arbitrary atoms to an arbitrary material, ensures high purity of the doping element. It is linked with sample processing at low temperatures. In implantation it is possible to independently change the dose and energy of the ions thereby affecting the spatial distribution of the ions. (M.S.)

  8. Ion implantation in semiconductors

    Energy Technology Data Exchange (ETDEWEB)

    Gusev, V; Gusevova, M

    1980-06-01

    The historical development of the method of ion implantation, the physical research of the method, its technological solution and practical uses is described. The method is universally applicable, allows the implantation of arbitrary atoms to an arbitrary material and ensures high purity of the doping element. It is linked with sample processing at low temperatures. In implantation it is possible to independently change the dose and energy of the ions thereby affecting the spatial distribution of the ions.

  9. Trends in Cochlear Implants

    OpenAIRE

    Zeng, Fan-Gang

    2004-01-01

    More than 60,000 people worldwide use cochlear implants as a means to restore functional hearing. Although individual performance variability is still high, an average implant user can talk on the phone in a quiet environment. Cochlear-implant research has also matured as a field, as evidenced by the exponential growth in both the patient population and scientific publication. The present report examines current issues related to audiologic, clinical, engineering, anatomic, and physiologic as...

  10. 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

  11. High energy ion implantation

    International Nuclear Information System (INIS)

    Ziegler, J.F.

    1985-01-01

    High energy ion implantation offers the oppertunity for unique structures in semiconductor processing. The unusual physical properties of such implantations are discussed as well as the special problems in masking and damage annealing. A review is made of proposed circuit structures which involve deep implantation. Examples are: deep buried bipolar collectors fabricated without epitaxy, barrier layers to reduce FET memory sensitivity to soft-fails, CMOS isolation well structures, MeV implantation for customization and correction of completed circuits, and graded reach-throughs to deep active device components. (orig.)

  12. [Silastic implant and synovitis].

    Science.gov (United States)

    Sennwald, G

    1989-07-22

    The silastic implant based on siloxane polymere induces granulomatous synovitis in certain predisposed individuals, a reaction which may continue even after removal of the implant. This is also true of a prosthesis of the trapezium in two of our patients, though to a lesser degree. This is probably the reason why the problem has not yet been widely recognized. The hypothesis is put forward that an enzymatic predisposition may allow chemical degradation of the fragmented silastic implant into a toxic component responsible for the pathologic condition. The slow progression of the lesions is a challenge for the future and puts in question the further use of silastic implants.

  13. Cochlear implant magnet retrofit.

    Science.gov (United States)

    Cohen, N L; Breda, S D; Hoffman, R A

    1988-06-01

    An implantable magnet is now available for patients who have received the standard Nucleus 22-channel cochlear implant and who are not able to wear the headband satisfactorily. This magnet is attached in piggy-back fashion to the previously implanted receiver/stimulator by means of a brief operation under local anesthesia. Two patients have received this magnet retrofit, and are now wearing the headset with greater comfort and satisfaction. It is felt that the availability of this magnet will increase patient compliance in regard to hours of implant usage.

  14. Evaluation of pre-tightening in abutments and prosthetic screws on different implant connections = Avaliação do pré-aparafusamento em pilares e parafusos protéticos em diferentes conexões de implante

    Directory of Open Access Journals (Sweden)

    Panza, Leonardo Henrique Vadenal

    2010-01-01

    Conclusão: Os tipos de conexão do implante ou pilar fetaram a manutenção do préaparafusamento. As conexões de hexágono interno e externo foram efetivas para evitar o deslocamento horizontal das coroas

  15. A IDENTIFICAÇÃO DE TIPOS DE LIDERANÇA A PARTIR DE ARQUÉTIPOS

    Directory of Open Access Journals (Sweden)

    Adriana Nunes Lacerda e Prestupa

    2009-09-01

    junguianos analisados por Moore e Gillette (1993 foram relacionados com características de líderes dentro do contexto organizacional. Desta forma foi possível apresentar uma tipologia rica e aplicável, onde o individuo pode se identificar e também entender o processo e a maturação das características dos arquétipos estudados para melhor desempenho dentro das organizações.

  16. Percutaneous and skeletal biocarbon implants

    Science.gov (United States)

    Mooney, V.

    1977-01-01

    Review of carbon implants developed by NASA discussed four different types of implants and subsequent improvements. Improvements could be of specific interest to rehabilitation centers and similar organizations.

  17. Degradable Implantate: Entwicklungsbeispiele

    Science.gov (United States)

    Ruffieux, Kurt; Wintermantel, Erich

    Resorbierbare Implantate werden seit mehreren Jahrzehnten in der Implantologie eingesetzt. Bekannt wurden diese Biomaterialien mit dem Aufkommen von sich selbst auflösenden Nahtfäden auf der Basis von synthetisch hergestellten Polylactiden und Polyglycoliden in den 70er Jahren. In einem nächsten Schritt wurden Implantate wie Platten und Schrauben zur Gewebefixation aus den gleichen Biomaterialien hergestellt.

  18. Risks of Breast Implants

    Science.gov (United States)

    ... have a risk of developing a type of cancer called breast implant-associated anaplastic large cell lymphoma (BIA-ALCL) in the breast tissue surrounding the implant. BIA-ALCL is not breast cancer. Women diagnosed with BIA-ALCL may need to ...

  19. Ion implantation of metals

    International Nuclear Information System (INIS)

    Dearnaley, G.

    1976-01-01

    In this part of the paper descriptions are given of the effects of ion implantation on (a) friction and wear in metals; and (b) corrosion of metals. In the study of corrosion, ion implantation can be used either to introduce a constituent that is known to convey corrosion resistance, or more generally to examine the parameters which control corrosion. (U.K.)

  20. Ion implantation into diamond

    International Nuclear Information System (INIS)

    Sato, Susumu

    1994-01-01

    The graphitization and the change to amorphous state of diamond surface layer by ion implantation and its characteristics are reported. In the diamond surface, into which more than 10 16 ions/cm 2 was implanted, the diamond crystals are broken, and the structure changes to other carbon structure such as amorphous state or graphite. Accompanying this change of structure, the electric conductivity of the implanted layer shows two discontinuous values due to high resistance and low resistance. This control of structure can be done by the temperature of the base during the ion implantation into diamond. Also it is referred to that by the base temperature during implantation, the mutual change of the structure between amorphous state and graphite can be controlled. The change of the electric resistance and the optical characteristics by the ion implantation into diamond surface, the structural analysis by Raman spectroscopy, and the control of the structure of the implanted layer by the base temperature during implantation are reported. (K.I.)

  1. Number of implants for mandibular implant overdentures: a systematic review

    Science.gov (United States)

    Lee, Jeong-Yol; Kim, Ha-Young; Bryant, S. Ross

    2012-01-01

    PURPOSE The aim of this systematic review is to address treatment outcomes of Mandibular implant overdentures relative to implant survival rate, maintenance and complications, and patient satisfaction. MATERIALS AND METHODS A systematic literature search was conducted by a PubMed search strategy and hand-searching of relevant journals from included studies. Randomized Clinical Trials (RCT) and comparative clinical trial studies on mandibular implant overdentures until August, 2010 were selected. Eleven studies from 1098 studies were finally selected and data were analyzed relative to number of implants. RESULTS Six studies presented the data of the implant survival rate which ranged from 95% to 100% for 2 and 4 implant group and from 81.8% to 96.1% for 1 and 2 implant group. One study, which statistically compared implant survival rate showed no significant differences relative to the number of implants. The most common type of prosthetic maintenance and complications were replacement or reattaching of loose clips for 2 and 4 implant group, and denture repair due to the fracture around an implant for 1 and 2 implant groups. Most studies showed no significant differences in the rate of prosthetic maintenance and complication, and patient satisfaction regardless the number of implants. CONCLUSION The implant survival rate of mandibular overdentures is high regardless of the number of implants. Denture maintenance is likely not inflenced substantially by the number of implants and patient satisfaction is typically high again regardless os the number of implants. PMID:23236572

  2. Ion implantation into iron

    International Nuclear Information System (INIS)

    Iwaki, Masaya

    1978-01-01

    The distribution of implanted ions in iron, the friction characteristics and the corrosion of iron were studied. The distribution of Ni or Cr ions implanted into mild steel was measured. The accelerated voltage was 150 keV, and the beam current density was about 2 microampere/cm 2 . The measurement was made with an ion microanalyzer. The measured distribution was compared with that of LSS theory. Deep invasion of Ni was seen in the measured distribution. The distribution of Cr ions was different from the distribution calculated by the LSS theory. The relative friction coefficient of mild steel varied according to the dose of implanted Cu or N ions, and to the accelerating voltage. Formation of compound metals on the surfaces of metals by ion-implantation was investigated for the purpose to prevent the corrosion of metals. The resistance of mild steel in which Ni ions were implanted was larger than that of mild steel without any treatment. (Kato, T.)

  3. Estudo da resposta tissular à endoprótese recoberta de jugular bovina em veia cava inferior de suínos Bovine jugular covered stent-graft implanted in swine inferior vena cava - a study of tissue response

    Directory of Open Access Journals (Sweden)

    Cristina Ribeiro Riguetti Pinto

    2006-06-01

    Full Text Available OBJETIVO: Avaliar a resposta tissular a uma endoprótese, com cobertura biológica heteróloga, implantada em veia cava inferior de suínos. MÉTODO: Desenvolvemos uma endoprótese auto-expansível, revestida com um segmento de jugular bovina, conservada por processo L-hydro e suturada em um stent de aço inoxidável 316L. O dispositivo introdutor utilizado foi a bainha de liberação da endoprótese aórtica Taheri-Leonhardt (Flórida, EUA. Foram implantadas endopróteses em 10 suínos, todas na veia cava infra-renal. Os animais foram submetidos à flebografia peroperatória. À necropsia, após 2 meses, cada endoprótese foi retirada em bloco e analisada macroscopicamente, visando a avaliação da perviedade, aderência aos tecidos vizinhos e incorporação à parede venosa; e, histopatologicamente, visando a resposta histológica ao enxerto. RESULTADOS: Na análise macroscópica, todas as endopróteses encontravam-se pérvias e totalmente incorporadas à parede venosa, porém seis apresentavam trabeculações grosseiras no seu interior e quatro algum grau de fibrose perivascular. Três animais desenvolveram linfocele, uma retroperitoneal e as outras na parede abdominal. No estudo histopatológico, observamos reação inflamatória granulomatosa tipo corpo estranho em todos os casos, sendo predominante na camada média (80%. CONCLUSÃO: O modelo estudado apresentou baixa trombogenicidade, corroborando com a eficácia do meio de conservação e material escolhidos; porém, baixa biocompatibilidade, provavelmente pelo obstáculo imunológico dos xenoenxertos e resposta tissular exagerada do território venoso.OBJECTIVE: To evaluate tissue response to a bovine jugular vein covered stent when implanted in the swine inferior vena cava. METHOD: We developed a self-expanding stent, using a segment of L-hydro conserved bovine jugular vein, which was trimmed and sutured to a 316L stainless steel stent. We used the Taheri-Leonhardt delivery system for

  4. Influence of Palatal Coverage and Implant Distribution on Implant Strain in Maxillary Implant Overdentures.

    Science.gov (United States)

    Takahashi, Toshihito; Gonda, Tomoya; Mizuno, Yoko; Fujinami, Yozo; Maeda, Yoshinobu

    2016-01-01

    Maxillary implant overdentures are often used in clinical practice. However, there is no agreement or established guidelines regarding prosthetic design or optimal implant placement configuration. The purpose of this study was to examine the influence of palatal coverage and implant number and distribution in relation to impact strain under maxillary implant overdentures. A maxillary edentulous model with implants and experimental overdentures with and without palatal coverage was fabricated. Four strain gauges were attached to each implant, and they were positioned in the anterior, premolar, and molar areas. A vertical occlusal load of 98 N was applied through a mandibular complete denture, and the implant strains were compared using one-way analysis of variance (P = .05). The palatolabial strain was much higher on anterior implants than on other implants in both denture types. Although there was no significant difference between the strain under dentures with and without palatal coverage, palateless dentures tended to result in higher implant strain than dentures with palatal coverage. Dentures supported by only two implants registered higher strain than those supported by four or six implants. Implants under palateless dentures registered higher strain than those under dentures with palatal coverage. Anterior implants exhibited higher palatolabial strain than other implants regardless of palatal coverage and implant configuration; it is therefore recommended that maxillary implant overdentures should be supported by six implants with support extending to the distal end of the arch.

  5. Análisis estadístico exploratorio de dos tipos de secado de quinua

    OpenAIRE

    Mena Reinoso, Angel Patricio

    2015-01-01

    El presente trabajo “Análisis Estadístico Exploratorio de dos Tipos de Secado de Quinua” permite realizar una validación estadística del tipo de secador que posea una alta eficiencia, rendimiento en el secado de este tipo de cereal (Chenopodium quinoa Willd). Para el efecto se empleó el secador de bandejas y un secador solar tipo invernadero, el experimento se llevó a cabo con tres tipos de muestras, una con cascara y las otras escarificadas. La quinua fue sometida a un secado ...

  6. Síndrome de Waardenburg tipo I: relato de caso

    Directory of Open Access Journals (Sweden)

    Patricia Capua Vieira da Silva

    2011-06-01

    Full Text Available A síndrome de Waardenburg tipo I é uma desordem auditivo-pigmentária que inclui, entre outros, perda auditiva neurossensorial congênita não progressiva, telecanto, distúrbios pigmentares de íris, cabelo e pele. Indivíduos afetados podem ter maior risco de: defeitos no tubo neural, fendas labial e palatina, anormalidades nos membros e doença de Hirschsprung. O diagnóstico é clínico, sendo necessários dois critérios maiores ou um maior e dois menores. PAX3 é o único gene conhecido associado à síndrome, sendo, entretanto, mais usado no aconselhamento genético. Quanto ao diagnóstico diferencial, podemos citar: outras causas de perda auditiva neurossensorial congênita não progressiva, outros tipo de síndrome de Waardenburg, piebaldismo, albinismo, vitiligo e síndrome de Teitz. Neste trabalho, apresenta-se um paciente masculino de 11 anos com diagnóstico de síndrome de Waardenburg tipo I. Ressalta-se a importância do oftalmologista no auxílio do diagnóstico deste raro quadro sistêmico, uma vez que inclui algumas alterações oftalmológicas. O diagnóstico precoce da síndrome permite estimulação adequada para a perda auditiva, assim como medidas preventivas em caso de gestantes afetadas no aconselhamento genético.

  7. Tipos do Herbário Prisco Bezerra - EAC

    Directory of Open Access Journals (Sweden)

    Maria Stela Bezerra da Silva

    1990-01-01

    Full Text Available Com o presente trabalho pretende-se contribuir para a divulgação dos tipos do Herbário Prisco Bezerra - EAC. Um levantamento realizado no acervo do Herbário revelou o registro de dez tipos. Sete deles pertencentes à família Leguminosae distribuídas entre as subfamilias Caesalpinioideae: Peltogyne crenulata, Sentia dardanoi, Moldenhawera acuminata, Chamaecrista duckeana, Papilionoideae: Aeschynomene monteiroi, Cranocarpus gracilis e Mimosoideae: Mimosa niomarlei; dois, pertencentes à família Erythroxylaceae. As espécies Erythroxylum tianguanum e Erythroxylum bezerrae e um à família Euphorbiaceae: Dalechampia fernandesii recentemente descrita por G. Webster. Os tipos são apresentados na seqüência das indicações: nome das famílias, seguido do epíteto específico, habitat, com a transferência de todas as informações mencionadas na ficha de exsicata do material, bem como, a fotografia correspondente. Citam-se também alguns aspectos característicos das espécies, para melhor visualização dos detalhes fotográficos.The present paper repasts the type specimens in the Herbário Prisco Bezerra (University of Ceará. The Herbário has ten type, of which seven are Leguminosae: Peltoqyne crenulata, Senna dardanoi, Moldenhawera acuminata Chamaecrista duckeana, Aeschynomene monteiroi, Cranocarpus gracilis, Mimosa niomarlei, two the Erythroxylaceae: Erythroxylum tianquanum and Erythroxylum bezerrae and one Euphorbiaceae: Dalechampia fernandesii. Additional informations for these exsicata is presented.

  8. Estresse em mulheres com Diabetes mellitus tipo 2

    OpenAIRE

    Lessmann, Juliana Cristina; Silva, Denise Maria Guerreiro Vieira da; Nassar, Silvia Modesto

    2011-01-01

    OBJETIVO: O objetivo do estudo foi investigar a relação entre estresse e Diabetes Mellitus Tipo 2 em mulheres. MÉTODO: Estudo transversal prospectivo, desenvolvido com 147 mulheres, utilizando a Escala de Estresse Percebido (PSS). RESULTADOS: Houve associação entre as variáveis testadas, sendo possível inferir que as mulheres com estresse elevado são as que vivenciaram sofrimento e apresentam controle glicêmico alterado, ou seja, com valores superiores a 180 mg/dL. A maioria relatou sofriment...

  9. Diabetes tipo 2 y obesidad leve: tratamiento quirúrgico

    OpenAIRE

    Lanzaren S,Enrique

    2013-01-01

    Introducción: En la actualidad la diabetes mellitus tipo 2 (DM2) y la obesidad representan un serio problema de salud, comportándose como enfermedades epidémicas. Existe un gran interés en explorar distintas opciones de tratamiento de la DM2 en pacientes que no tienen obesidad mórbida. Objetivo: Reportar los parámetros de control glicémico en pacientes con DM2 y obesidad leve sometidos a bypass gástrico (BPG) a 3 años de seguimiento. Metodología: Estudio clínico prospectivo que incluye pacien...

  10. Tipos de Tiempo en el periodo de Semana Santa Vallisoletana.

    OpenAIRE

    Miranda Martín, Javier

    2017-01-01

    El propósito del proyecto es el análisis y la caracterización de ciertos tipos de tiempo a partir de los datos observados de la Base de Datos Climatológica del Observatorio de Valladolid. Los datos analizados corresponden a los ocho días de Semana Santa de un periodo de 37 años que comprenden entre los años 1981 y 2017. Grado en Geografía y Ordenación del Territorio

  11. Atrofia muscular espinal tipo 1: enfermedad de Werdnig-Hoffmann

    OpenAIRE

    Zárate-Aspiros, Romeo; Rosas-Sumano, Ana Beatriz; Paz-Pacheco, Alberto; Fenton-Navarro, Patricia; Chinas-López, Silvet; López-Ríos, José Antonio

    2013-01-01

    Introducción. Las atrofias musculares espinales de la infancia son enfermedades neuromusculares hereditarias, autosómicas, recesivas, caracterizadas por la degeneración de las neuronas motoras del asta anterior de la médula espinal. La atrofia muscular espinal tipo I (enfermedad de Werdnig-Hoffmann) es la forma más severa. Se inicia in útero o durante los primeros meses de vida. La muerte suele ocurrir antes de los dos años de edad. Caso clínico. Lactante de 6 meses de edad que ingresa al Ser...

  12. Fundamentos del Tipo de Cambio Real en Chile

    OpenAIRE

    Rodrigo Cerda; Alvaro Donoso; Aldo Lema

    2003-01-01

    Un modelo basado en la relación gasto-producto (efecto Salter-Swan) y los términos de intercambio, habría predicho un incremento más pronunciado del tipo de cambio real (TCR) en Chile durante la segunda mitad de los '80, una caída menos acentuada entre 1990 y 1997, y un aumento más fuerte a partir de 1998 cuando irrumpió la crisis financiera internacional. Este trabajo incorpora en forma exhaustiva otros factores en la determinación de largo plazo del TCR, tanto de oferta como de demanda. Usa...

  13. Propiedades y aplicaciones de piezocomposites tipo címbalo

    Directory of Open Access Journals (Sweden)

    Ochoa, P.

    2001-08-01

    Full Text Available The metal-ceramic composite actuators, moonies and cymbals consist in capped piezoceramic disks with metallic endcaps having cavities inside. These cavities favour the amplification of direct and reverse piezoelectric effects. These actuators fill the gap between high displacement low generative force bimorph actuators and low displacement high generative force multilayer ceramic actuators. The moonie actuator can give displacements greater than 100 mm, maximum generative force of 3N to several N´s, response time of 20 to 100 ms, and low fatigue test response for more than 107 cycles. Cymbals actuators shows twice as big as displacement than moonie for the studied size, much higher generative force and the possibility to avoid the temperature dependence of the displacement for selected materials. Properties of cymbal actuators can be tailored trough the selection of materials. Also, cymbal actuators can be tuned to adopt different resonance frequencies.

    Los composites metal-cerámica tipo luna y címbalo consisten en discos piezoeléctricos encapsulados con cápsulas metálicas que poseen una cavidad. Esta cavidad favorece la amplificación de los efectos piezoeléctricos directo e inverso. Estos actuadores llenan el escalón entre actuadores multicapa, con desplazamientos pequeños y fuerzas generativas elevadas, y actuadores bimorfos, con desplazamientos grandes y fuerzas generativas pequeñas. El actuador tipo luna alcanza desplazamientos de más de 100mm, fuerzas generativas máximas de hasta varios N´s, tiempos de respuesta desde 20 hasta 100ms, y baja respuesta en ensayos de fatiga a más de 107 ciclos. Los actuadores tipo címbalo muestran desplazamientos dos veces mayores que los obtenidos con actuadores tipo luna para el mismo tamaño, fuerzas generativas mucho mayores y la posibilidad de eliminar la dependencia del desplazamiento con la temperatura mediante selección de los materiales. Además poseen unas caracter

  14. Implants for orthodontic anchorage

    Science.gov (United States)

    Zheng, Xiaowen; Sun, Yannan; Zhang, Yimei; Cai, Ting; Sun, Feng; Lin, Jiuxiang

    2018-01-01

    Abstract Implantanchorage continues to receive much attention as an important orthodontic anchorage. Since the development of orthodontic implants, the scope of applications has continued to increase. Although multiple reviews detailing implants have been published, no comprehensive evaluations have been performed. Thus, the purpose of this study was to comprehensively evaluate the effects of implants based on data published in review articles. An electronic search of the Cochrane Library, Medline, Embase, Ebsco and Sicencedirect for reviews with “orthodontic” and “systematic review or meta analysis” in the title, abstract, keywords, or full text was performed. A subsequent manual search was then performed to identify reviews concerning orthodontic implants. A manual search of the orthodontic journals American Journal of Orthodontics and Dentofacial Orthopedics (AJODO), European Journal of Orthodontics (EJO), and Angle Othodontist was also performed. Such systematic reviews that evaluated the efficacy and safety of orthodontic implants were used to indicate success rates and molar movements. A total of 23 reviews were included in the analysis. The quality of each review was assessed using a measurement tool for Assessment of Multiple Systematic Reviews (AMSTAR), and the review chosen to summarize outcomes had a quality score of >6. Most reviews were less than moderate quality. Success rates of implants ranged in a broad scope, and movement of the maxillary first molar was superior with implants compared with traditional anchorage. PMID:29595673

  15. Maintenance in dental implants

    Directory of Open Access Journals (Sweden)

    Giselle Póvoa Gomes

    2008-01-01

    Full Text Available In implants, maintenance is a decisive factor for obtaining success when implant supported overdentures and dentures are used. The present stud presents, a clinical case of a patient, a 70 year-old white man, with a completely edentulous mandibular alveolar ridge, severe bone resorption with presence of basal bone only, and absence of vestibule. Initially, treatment consisted of the placement of a mandibular overdenture, supported on three implants in the anterior inter-foramen region, as the left implant was transfixed in the basal bone of 2 to 3 millimeters. Eleven years later, another two implants were placed in the anterior area and an immediate load was performed up to the first molars, for the placement of an implant supported fixed. Throughout the entire treatment, meticulous maintenance was carried out, with follow-up for fourteen years, interrupted by the patient’s death. From the third month after the opening the three implants initially placed, the presence of keratinized mucosa, definition of the vestibule, maturation of the alveolar ridge and bone formation in the mento region were observed. It was concluded that good planning, allied to mastery of the technique and adequate maintenance were the prerequisites necessary for obtaining favorable results, success of the present case, and for the patient to have a better quality of life.

  16. Los implantes MG-OSSEOUS: Estudio multicéntrico retrospectivo MG-OSSEOUS implants: A multicentric retrospective study

    Directory of Open Access Journals (Sweden)

    E. Serrano Caturla

    2006-12-01

    Full Text Available Objetivo. Aportar unos datos estadísticamente fiables sobre la supervivencia e incidencias asociadas a los implantes y prótesis del modelo MG-OSSEOUS (Mozo-Grau, S.L., Valladolid, España y demostrar que su eficacia es comparable a todas las marcas comerciales. Material y método. Estudio multicéntrico retrospectivo coordinado por la empresa Scientific Management in O&SS (Barcelona, España. Se colocaron 1001 implantes en 247 pacientes y se diseñaron 328 prótesis, entre los años 2004 y 2005, con un seguimiento de 2 años. Todos los implantes cargados. Se analizan y pormenorizan todos los implantes, por diámetros, longitudes, posiciones, fases quirúrgicas, cargas, tipos y modelos de prótesis y técnicas complementarias aplicadas, tanto sincrónica como anacrónicamente. Resultados. Tras la homogeneización de las muestras, se objetiva una supervivencia del 97,8% a los 2 años, detallando los fracasos según las características de cada caso clínico. No se reporta ningún fracaso de la prótesis. Discusión. Protocolizamos una serie de criterios e indicaciones a la hora de colocar los implantes MG-OSSEOUS según los casos clínicos. Comparamos nuestros resultados con la bibliografía, tanto pretérita como actual, coincidiendo con la manera de actuar a lo largo de la historia de la implantología. Finalmente, extrapolamos los resultados que consideramos comparables a los publicados por el grupo Branemark. Conclusión. La calidad del implante MG-OSSEOUS combinada con protocolos implantológicos científicamente contrastados, muestra un 2,2% de fracaso a los 2 años de seguimiento, con un porcentaje de éxito del 100% tanto en la recolocación del implante como en la fase protésica.Objective. We present some statistically contrasted results regarding the survival and incidences of MG-OSSEOUS implants and prosthetic components (Mozo-Grau, S.L., Valladolid, Spain, and we prove that they have the same efficacy when compared with other

  17. Nanotechnology for dental implants.

    Science.gov (United States)

    Tomsia, Antoni P; Lee, Janice S; Wegst, Ulrike G K; Saiz, Eduardo

    2013-01-01

    With the advent of nanotechnology, an opportunity exists for the engineering of new dental implant materials. Metallic dental implants have been successfully used for decades, but they have shortcomings related to osseointegration and mechanical properties that do not match those of bone. Absent the development of an entirely new class of materials, faster osseointegration of currently available dental implants can be accomplished by various surface modifications. To date, there is no consensus regarding the preferred method(s) of implant surface modification, and further development will be required before the ideal implant surface can be created, let alone become available for clinical use. Current approaches can generally be categorized into three areas: ceramic coatings, surface functionalization, and patterning on the micro- to nanoscale. The distinctions among these are imprecise, as some or all of these approaches can be combined to improve in vivo implant performance. These surface improvements have resulted in durable implants with a high percentage of success and long-term function. Nanotechnology has provided another set of opportunities for the manipulation of implant surfaces in its capacity to mimic the surface topography formed by extracellular matrix components of natural tissue. The possibilities introduced by nanotechnology now permit the tailoring of implant chemistry and structure with an unprecedented degree of control. For the first time, tools are available that can be used to manipulate the physicochemical environment and monitor key cellular events at the molecular level. These new tools and capabilities will result in faster bone formation, reduced healing time, and rapid recovery to function.

  18. Ion implantation for microelectronics

    International Nuclear Information System (INIS)

    Dearnaley, G.

    1977-01-01

    Ion implantation has proved to be a versatile and efficient means of producing microelectronic devices. This review summarizes the relevant physics and technology and assesses the advantages of the method. Examples are then given of widely different device structures which have been made by ion implantation. While most of the industrial application has been in silicon, good progress continues to be made in the more difficult field of compound semiconductors. Equipment designed for the industrial ion implantation of microelectronic devices is discussed briefly. (Auth.)

  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. Diabetes mellitus tipo 2 y resistencia a la insulina

    Directory of Open Access Journals (Sweden)

    Enrique Cipriani-Thorne

    2010-07-01

    Full Text Available Se analizó la literatura de los últimos 15 años para poder objetivar los temas que son materia de esta comunicación. En primer lugar se analiza en qué consiste el llamado Síndrome Metabólico, sus características; a continuación se resume la historia natural de la Diabetes Mellitus tipo II y su patogenia. Se revisa la importancia de la resistencia a la insulina en el músculo estriado principal órgano de combustión de la glucosa y el factor mitocondrial de la resistencia a la insulina. Se analiza además la importancia de resistencia a la insulina con respecto al metabolismo del hígado y en particular a las alteraciones del metabolismo del colesterol y de los triglicéridos. Se hace un comentario extenso de cómo así la Diabetes Mellitus Tipo II es considerada en la actualidad como una enfermedad de origen inflamatorio y por último se discuten las consecuencias de la hiperinsulinemia, dado que el exceso de insulina es producido por el bloqueo en la línea metabólica de su acción más no en su línea de producir proliferación tisular.(Rev Med Hered 2010;21:160-170.

  1. Breast Reconstruction with Implants

    Science.gov (United States)

    ... your surgical options and discuss the advantages and disadvantages of implant-based reconstruction, and may show you ... Policy Notice of Privacy Practices Notice of Nondiscrimination Advertising Mayo Clinic is a not-for-profit organization ...

  2. 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....

  3. Precipitation processes in implanted materials

    International Nuclear Information System (INIS)

    Borders, J.A.

    1978-01-01

    Ion implantation is a nonequilibrium process. It is possible to implant materials with impurities to concentration levels which exceed the solid solubilities. The return of the system to thermodynamic equilibrium is often accomplished by precipitation of the implanted species or a compound involving atoms of both the host and the implanted species. This may involve long time scales when taking place at room temperature or it may take place during the implantation

  4. Ion implantation for semiconductors

    International Nuclear Information System (INIS)

    Grey-Morgan, T.

    1995-01-01

    Full text: Over the past two decades, thousands of particle accelerators have been used to implant foreign atoms like boron, phosphorus and arsenic into silicon crystal wafers to produce special embedded layers for manufacturing semiconductor devices. Depending on the device required, the atomic species, the depth of implant and doping levels are the main parameters for the implantation process; the selection and parameter control is totally automated. The depth of the implant, usually less than 1 micron, is determined by the ion energy, which can be varied between 2 and 600 keV. The ion beam is extracted from a Freeman or Bernas type ion source and accelerated to 60 keV before mass analysis. For higher beam energies postacceleration is applied up to 200 keV and even higher energies can be achieved by mass selecting multiplycharged ions, but with a corresponding reduction in beam output. Depending on the device to be manufactured, doping levels can range from 10 10 to 10 15 atoms/cm 2 and are controlled by implanter beam currents in the range up to 30mA; continuous process monitoring ensures uniformity across the wafer of better than 1 % . As semiconductor devices get smaller, additional sophistication is required in the design of the implanter. The silicon wafers charge electrically during implantation and this charge must be dissipated continuously to reduce the electrical stress in the device and avoid destructive electrical breakdown. Electron flood guns produce low energy electrons (below 10 electronvolts) to neutralize positive charge buildup and implanter design must ensure minimum contamination by other isotopic species and ensure low internal sputter rates. The pace of technology in the semiconductor industry is such that implanters are being built now for 256 Megabit circuits but which are only likely to be widely available five years from now. Several specialist companies manufacture implanter systems, each costing around US$5 million, depending on the

  5. Quantitative ion implantation

    International Nuclear Information System (INIS)

    Gries, W.H.

    1976-06-01

    This is a report of the study of the implantation of heavy ions at medium keV-energies into electrically conducting mono-elemental solids, at ion doses too small to cause significant loss of the implanted ions by resputtering. The study has been undertaken to investigate the possibility of accurate portioning of matter in submicrogram quantities, with some specific applications in mind. The problem is extensively investigated both on a theoretical level and in practice. A mathematical model is developed for calculating the loss of implanted ions by resputtering as a function of the implanted ion dose and the sputtering yield. Numerical data are produced therefrom which permit a good order-of-magnitude estimate of the loss for any ion/solid combination in which the ions are heavier than the solid atoms, and for any ion energy from 10 to 300 keV. The implanted ion dose is measured by integration of the ion beam current, and equipment and techniques are described which make possible the accurate integration of an ion current in an electromagnetic isotope separator. The methods are applied to two sample cases, one being a stable isotope, the other a radioisotope. In both cases independent methods are used to show that the implantation is indeed quantitative, as predicted. At the same time the sample cases are used to demonstrate two possible applications for quantitative ion implantation, viz. firstly for the manufacture of calibration standards for instrumental micromethods of elemental trace analysis in metals, and secondly for the determination of the half-lives of long-lived radioisotopes by a specific activity method. It is concluded that the present study has advanced quantitative ion implantation to the state where it can be successfully applied to the solution of problems in other fields

  6. Ion implantation - an introduction

    International Nuclear Information System (INIS)

    Townsend, P.D.

    1986-01-01

    Ion implantation is a widely used technique with a literature that covers semiconductor production, surface treatments of steels, corrosion resistance, catalysis and integrated optics. This brief introduction outlines advantages of the technique, some aspects of the underlying physics and examples of current applications. Ion implantation is already an essential part of semiconductor technology while in many other areas it is still in an early stage of development. The future scope of the subject is discussed. (author)

  7. Lipoestructura y relleno del polo superior de la mama frente a implantes Structural fat graft and lipofilling of mammary upper pole versus mammary implants

    Directory of Open Access Journals (Sweden)

    J.M. Cervilla Lozano

    2012-09-01

    Full Text Available La lipoestructura mamaria ofrece nuevas alternativas de tratamiento en la cirugía estética de aumento mamario, cumpliendo en algunos casos las expectativas esperadas y en otros no. Analizamos este hecho en 4 tipos de aplicación de lipoestructura mamaria que hemos venido realizando en los últimos años, centrándonos en un aspecto importante de esta cirugía que es el relleno del polo superior de la mama. Los tipos de aplicación empleados son: aumento mamario simple mediante lipoestructura en comparación con implantes; pexia más lipoestructura frente a pexia más implantes mamarios; reconstrucción de mama tuberosa mediante lipoestructura o implantes y finalmente, relleno periprotésico mediante lipoestructura en mamas sometidas a cirugía de aumento mamario con implantes. En definitiva, podríamos resumir este trabajo en una frase diciendo que la lipoestructura mamaria, a nuestro juicio, no sirve si lo que prima es conseguir el relleno del polo superior de la mama, siendo en este caso de elección la colocación de implantes mamarios. No obstante, en alguno de los casos señalados no solo es una alternativa, sino que obtiene resultados superiores a los logrados sólamente con implantes.The mammary structural fat graft offers news treatment options in breast augmentation cosmetic surgery, but it sometimes meets expectations and sometimes doesn´t. We analyze 4 different types of lipostructure mammary applications that we have been using in the last years, focused in an important aspect of this surgery as it´s the filling of the upper mammary pole. These applications are: mammary augmentation by simple structural fat compared with the use of mammary implants; structural fat graft and mastopexy versus implants and mastopexy; tuberous breast reconstruction using structural fat graft or implants and finally, periprosthetic filling in breast augmentation with mammary implants using structural fat graft. In short, we could summarize this paper

  8. 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

  9. Anodized dental implant surface

    Directory of Open Access Journals (Sweden)

    Sunil Kumar Mishra

    2017-01-01

    Full Text Available Purpose: Anodized implants with moderately rough surface were introduced around 2000. Whether these implants enhanced biologic effect to improve the environment for better osseointegration was unclear. The purpose of this article was to review the literature available on anodized surface in terms of their clinical success rate and bone response in patients till now. Materials and Methods: A broad electronic search of MEDLINE and PubMed databases was performed. A focus was made on peer-reviewed dental journals. Only articles related to anodized implants were included. Both animal and human studies were included. Results: The initial search of articles resulted in 581 articles on anodized implants. The initial screening of titles and abstracts resulted in 112 full-text papers; 40 animal studies, 16 studies on cell adhesion and bacterial adhesion onto anodized surfaced implants, and 47 human studies were included. Nine studies, which do not fulfill the inclusion criteria, were excluded. Conclusions: The long-term studies on anodized surface implants do favor the surface, but in most of the studies, anodized surface is compared with that of machined surface, but not with other surfaces commercially available. Anodized surface in terms of clinical success rate in cases of compromised bone and immediately extracted sockets has shown favorable success.

  10. Plasma source ion implantation

    International Nuclear Information System (INIS)

    Conrad, J.R.; Forest, C.

    1986-01-01

    The authors' technique allows the ion implantation to be performed directly within the ion source at higher currents without ion beam extraction and transport. The potential benefits include greatly increased production rates (factors of 10-1000) and the ability to implant non-planar targets without rastering or shadowing. The technique eliminates the ion extractor grid set, beam raster equipment, drift space and target manipulator equipment. The target to be implanted is placed directly within the plasma source and is biased to a large negative potential so that plasma ions gain energy as they accelerate through the potential drop across the sheath that forms at the plasma boundary. Because the sheath surrounds the target on all sides, all surfaces of the target are implanted without the necessity to raster the beam or to rotate the target. The authors have succeeded in implanting nitrogen ions in a silicon target to the depths and concentrations required for surface treatment of materials like stainless steel and titanium alloys. They have performed ESCA measurements of the penetration depth profile of a silicon target that was biased to 30 kV in a nitrogen discharge plasma. Nitrogen ions were implanted to a depth of 700A at a peak concentration of 30% atomic. The measured profile is quite similar to a previously obtained profile in titanium targets with conventional techniques

  11. 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.

  12. Lipoproteína (a está associada com níveis basais de insulina em pacientes com Diabetes Mellitus tipo 2 Lipoproteína (a está asociada a niveles basales de insulina en pacientes con Diabetes Mellitus tipo 2 Lipoprotein (a is associated with basal insulin levels in patients with type 2 Diabetes Mellitus

    Directory of Open Access Journals (Sweden)

    Syed Shahid Habib

    2009-07-01

    Full Text Available FUNDAMENTO: Ainda não foi claramente estabelecido se a resistência/deficiência insulínica leva diretamente à aterogênese ou através de sua associação com outros fatores de risco como os níveis de lipoproteína (a[Lp(a]. OBJETIVO: O objetivo do estudo foi estabelecer a relação entre os níveis basais de insulina, lípides e lipoproteína (a em pacientes com diabetes mellitus (DM tipo 2. MÉTODOS: Amostras de sangue foram colhidas em jejum e os níveis de insulina, lipoproteína (a, colesterol total (CT, triglicérides (TG, lipoproteína de baixa densidade (LDL-C, lipoproteína de alta densidade (LDL-C, glicose e hemoglobina glicada (HbA1c foram medidos em 60 pacientes com DM tipo 2 e 28 indivíduos saudáveis. Nós dividimos os pacientes em dois grupos baseados nos níveis basais de insulina: > 10 µIU/ml e 10 µIU/ml comparados com aqueles que apresentavam insulina basal FUNDAMENTO: Todavía no se aclaró totalmente si la resistencia/deficiencia insulínica lleva directamente a la aterogénesis o a través de su asociación con otros factores de riesgo como los niveles de lipoproteína (a [Lp(a]. OBJETIVO: : El objetivo del estudio fue establecer la relación entre los niveles basales de insulina, lípidos y lipoproteína (a en pacientes con diabetes mellitus (DM tipo 2. MÉTODOS: Se extrajeron muestras de sangre en ayuno y se determinaron los niveles de insulina, lipoproteína (a, colesterol total (CT, triglicéridos (TG, lipoproteína de baja densidad (LDL-C, lipoproteína de alta densidad (LDL-C, glucosa y hemoglobina glicosilada (HbA1c en 60 pacientes con DM tipo 2 y 28 individuos sanos. Dividimos a los pacientes en dos grupos basados en los niveles basales de insulina: > 10 µIU/ml y 10 µIU/ml comparados con aquellos que presentaban insulina basal BACKGROUND: It has not been clearly established whether insulin resistance/deficiency leads directly to atherogenesis or through its association with other risk factors such as

  13. Mortality within the endovascular treatment in Stanford type B aortic dissections Mortalidade no tratamento endovascular nas dissecções aórticas tipo B

    Directory of Open Access Journals (Sweden)

    Alexandre Fioranelli

    2011-06-01

    Full Text Available BACKGROUND: Endovascular stent-graft repair of aortic dissections is a relatively new procedure, and although apparently less invasive, the efficacy and safety of this technique have not been fully established. OBJECTIVE: To evaluate mortality in patients with complicated Stanford type B aortic dissections submitted to endovascular treatment. METHODS: Clinical, anatomical, imaging and autopsy data of 23 patients with complicated type B aortic dissections were reviewed from November 2004 to October 2007. The main indications for transluminal thoracic stent-grafting included: persistent pain in spite of medical therapy, signs of distal limb ischemia, signs of aortic rupture, progression of aneurismal dilation of the descending aorta during follow-up (defined as a diameter > 50 mm and the diameter of descending thoracic aorta of 40mm or larger at the onset of aortic dissection. Data were analyzed statistically; all p-values were two-tailed and differences INTRODUÇÃO: O tratamento endovascular na dissecção de aorta é um procedimento relativamente novo e, embora aparentemente menos invasivo, a eficácia e a segurança dessa técnica não estão totalmente estabelecidas. OBJETIVO: Avaliar a mortalidade e complicações nos pacientes submetidos a tratamento endovascular na dissecção de aorta tipo B de Stanford. MÉTODOS: Foram revisados, a partir de novembro de 2004 a outubro de 2007, em estudo clínico, anatômico, de imagens e dados da autopsia de 23 pacientes com dissecção aórtica tipo B. As principais indicações para o procedimento foram: dor persistente apesar da terapia médica, sinais de isquemia distal do membro, sinais de ruptura da aorta, progressão da dilatação do aneurisma da aorta descendente, durante o seguimento (definida como um diâmetro > 5 cm e descendente da aorta torácica de 40 mm ou mais de diâmetro no início da dissecção aórtica. Os dados foram analisados estatisticamente considerados erro alfa de 5%. As vari

  14. formales o categorías tipo interfase?

    Directory of Open Access Journals (Sweden)

    Julio Alfonso Piña López

    2011-01-01

    Full Text Available Se analiza la relación entre los fenómenos básicos y los fenómenos del desarrollo y la personalidad, en términos de si los primeros deberían concebirse como condición de existencia necesaria y suficiente de los segundos, y, a su vez, si los unos y los otros lo son de los últimos. Se concluye que dependiendo de cómo se plantee dicha relación, es que eventualmente tendrá sentido la construcción de teorías formales sobre el desarrollo y la personalidad, o bien caracterizar ambos fenómenos como categorías tipo interfase con fines de predicción.

  15. Terapêutica da diabetes mellitus tipo 1

    OpenAIRE

    Antunes, Ana Luisa Lopes

    2009-01-01

    Introdução: Diabetes Mellitus (DM) é uma doença metabólica de etiologia múltipla caracterizada por hiperglicemia crónica com distúrbios no metabolismo dos hidratos de carbono, lípidos e proteínas, por deficiências na secreção e/ou acção da insulina. A descoberta da insulina em 1921, foi um grande marco na sua terapêutica, aumentando a esperança e qualidade de vida dos doentes, nomeadamente na DM tipo 1. Tornou-se um fármaco salvador de vidas (life saving). A primeira a ser comercializad...

  16. Tipo abstracto de datos "Biblioteca" Library Abstract data type

    Directory of Open Access Journals (Sweden)

    Silvana Temesio Vizoso

    2010-12-01

    Full Text Available Análisis de la descripción bibliográfica desde un punto de vista conceptual a partir de la especificación formal: tipo abstracto de datos "biblioteca". Se detallan otros abordajes usando el modelo entidad-relación y el lenguaje XML. Se concluye la relevancia del enfoque abstracto y su aplicabilidad genérica en un sujeto de cambio permanente.Analysis of bibliographic description from a conceptual point of view from the formal specification: "library" abstract data type. Other approaches are detailed using the entity-relationship model and XML language. We conclude the relevance of abstract approach and its general applicability in a subject of constant change.

  17. Tipos de socialización y desesperanza aprendida

    Directory of Open Access Journals (Sweden)

    Sandro Macassi

    1988-12-01

    Full Text Available Las nociones de alienación, falta de poder y desesperanza aprendida son revisadas. Sesenta obreros de una empresa limeña fueron evaluados en términos del tipo de socialización dominante (SD y desesperanza aprendida (DA en sus tres áreas: falta de motivación, falta de control y expectativas de no-control en el futuro. Las escalas SD y DA resultaron consistentes. El análisis de regresión múltiple con las variables grado de división del trabajo, el grado de instrucción y –en migrantes- edad de arribo y permanencia en la capital, evidenció que el único predictor de DA es el grado de instrucción, correlacionándose negativamente. Los resultados se discuten a la luz de la realidad peruana.

  18. Uso de la metformina en la diabetes mellitus tipo II

    Directory of Open Access Journals (Sweden)

    Yohana Salazar ÁLvarez

    2011-03-01

    Full Text Available Metformina es una biguanida eficaz en el control metabólico de la diabetes mellitus tipo II, no insulinodependiente cuando el control dietético falla. Dada su probada eficacia y actual accesibilidad en el mercado de medicamentos en Cuba, para ser utilizada a nivel primario de atención no solo en pacientes sintomáticos sino en la población en riesgo, se presenta este artículo cuyo propósito es actualizar a los especialistas de Medicina General Integral y Medicina Interna acerca de aspectos de interés relacionados con este medicamento, como: interacciones medicamentosas, enfermedades concomitantes, la biotransformación de la droga y los posibles efectos adversos que se pueden asociar a su uso. Se presentan consideraciones finales acerca del uso de esta droga.

  19. Compatibilidad sexual entre dos tipos de Hylocerus (Cactaceae

    Directory of Open Access Journals (Sweden)

    Roberta Castillo M

    2003-09-01

    Full Text Available Dos de los tipos de pitahaya mas cultivados en la Península de Yucatán, México, difieren principalmente por el color de su cáscara, el primero es de color rojo (Uqroo1, perteneciente a Hylocereus undatus, mientras que en el segundo es color amarillo claro (Uqroo2, hasta el momento también identificado como H. undatus; este último es mas dulce. En ambos tipos de pitahayas, se realizaron autopolinizaciones y polinizaciones cruzadas directas y recíprocas, con el propósito de evaluar el efecto en la cantidad de frutos que lograron su desarrollo. Se midieron algunas variables para detectar la influencia del progenitor paterno en algunas características del fruto. Los testigos se obtuvieron de flores polinizadas libremente. El diseño experimental utilizado fue completamente al azar, con 15 repeticiones por tratamiento. Se encontró que Uqroo1 es autocompatible, mientras que Uqroo2 es autoincompatible. Los testigos de ambos tipos alcanzaron el mismo peso, y los frutos de Uqroo2 logrados por polinización cruzada tuvieron un peso similar al de los testigos o fueron significativamente mas pesados. Algunas variables resultaron positivamente correlacionados; el coeficiente entre el número de semillas y el peso total del fruto fue de r = 0.84. La correlación mas alta (r = 0.97 resultó entre el peso total y el peso de la pulpa. En los frutos obtenidos por polinización cruzada prevalecieron las características del progenitor materno. Se recomienda cultivar la Pitahaya blanca con otro tipo de pitahaya, además de Uqroo1There are two types of pitahaya that are cultivated in Yucatan Peninsula of Mexico. They differ mainly in the skin color of the fruit, one of them has a red skin (Uqroo1, while the other has a light yellow skin (Uqroo2 both belong to Hylocereus undatus (Haworth Britt. & Rose. The yellow skin pitahaya is the sweetest. The studies were conducted using the methods of self pollination and cross pollination, with direct crosses and

  20. Avaliação de um novo implante intra-orbitário: resultados preliminares Evaluation of a new intraorbital implant: preliminary results

    Directory of Open Access Journals (Sweden)

    Thierry Malet

    2003-01-01

    Full Text Available OBJETIVO: Apresentar novo tipo de implante orbitário, com formato original, o modo de utilização e os resultados clínicos preliminares. MÉTODOS: Os autores descrevem a técnica cirúrgica utilizada para a inserção do novo implante em 22 pacientes, como implante primário ou secundário. Os pacientes foram avaliados de forma prospectiva quanto aos seguintes aspectos: cosmético (grau de sulco suprapalpebral e enoftalmia, mobilidade, centragem e volume do implante. O tempo de seguimento variou de 3 a 15 meses (média 1 ano. RESULTADOS: Observou-se resultado cosmético satisfatório, sem casos de enoftalmia ou de sulco suprapalpebral importante, bem como boa mobilidade das próteses adaptadas sobre o novo implante. Não houve casos de infecção, migração ou extrusão do implante. CONCLUSÃO: Os resultados pós-operatórios com o novo implante são comparáveis aos implantes com pinos externos. Contudo um estudo multicêntrico, com maior tempo de controle pós-operatório é necessário, para avaliação mais acurada das complicações potenciais.PURPOSE: To describe a new orbital implant, with an original shape, the surgical technique adapted for its implantation and preliminary results. METHODS: The authors describe the surgical technique performed in 22 patients, either as primary or secondary implants. The patients were evaluated in a prospective way to cosmesis (degree of upper lid sulcus and enophthalmos, implant mobility, volume and centralization. Follow-up ranged from 3 to 15 months (average 1 year. RESULTS: A good cosmetic result without cases of severe upper lid sulcus or enophthalmos and a good prosthesis mobility were observed. There was no implant infection, migration or extrusion. CONCLUSIONS: We conclude that the clinical results with the new implant can be compared to the usual coupled ones, but a multicentric study, with longer follow-up is necessary, for a better evaluation of its potential complications.

  1. [Bilateral cochlear implants].

    Science.gov (United States)

    Müller, J

    2017-07-01

    Cochlear implants (CI) are standard for the hearing rehabilitation of severe to profound deafness. Nowadays, if bilaterally indicated, bilateral implantation is usually recommended (in accordance with German guidelines). Bilateral implantation enables better speech discrimination in quiet and in noise, and restores directional and spatial hearing. Children with bilateral CI are able to undergo hearing-based hearing and speech development. Within the scope of their individual possibilities, bilaterally implanted children develop faster than children with unilateral CI and attain, e.g., a larger vocabulary within a certain time interval. Only bilateral implantation allows "binaural hearing," with all the benefits that people with normal hearing profit from, namely: better speech discrimination in quiet and in noise, as well as directional and spatial hearing. Naturally, the developments take time. Binaural CI users benefit from the same effects as normal hearing persons: head shadow effect, squelch effect, and summation and redundancy effects. Sequential CI fitting is not necessarily disadvantageous-both simultaneously and sequentially fitted patients benefit in a similar way. For children, earliest possible fitting and shortest possible interval between the two surgeries seems to positively influence the outcome if bilateral CI are indicated.

  2. 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 ...

  3. 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.

  4. Ion implantation control system

    International Nuclear Information System (INIS)

    Gault, R. B.; Keutzer, L. L.

    1985-01-01

    A control system is disclosed for an ion implantation system of the type in which the wafers to be implanted are mounted around the periphery of a disk which rotates and also moves in a radial direction relative to an ion beam to expose successive sections of each wafer to the radiation. The control system senses beam current which passes through one or more apertures in the disk and is collected by a Faraday cup. This current is integrated to obtain a measure of charge which is compared with a calculated value based upon the desired ion dosage and other parameters. The resultant controls the number of incremental steps the rotating disk moves radially to expose the adjacent sections of each wafer. This process is continued usually with two or more traverses until the entire surface of each wafer has been implanted with the proper ion dosage

  5. Implantation for tribological applications

    International Nuclear Information System (INIS)

    Leutenecker, R.; Cao-Minh, U.; Overbeck, R.

    1992-08-01

    Empirical results on the strength enhancement of steels by N- and B-implantation should be explained from a materials science point of view. The methods applied were X-ray diffractometry and element depth profiling. The investigations of N-implanted steels focussed on the nitride formation in selected model materials and, with respect to applications, in: X90 CrMoV and S 6-5-2 tool steels, austenite X10 CrNiTi189 as well as in hard chromium plates. Main topic in B-implanted steels were the transformations: crystalline Fe-phase - amorphous Fe-B-phase - crystalline boride phases. The result is an improvement in process control by first an insight into the strength enhancing mechanisms and second in into their generation depending on the materials microstructure and the process parameter. (orig.). 101 figs., 16 tabs., 15 refs [de

  6. 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.

  7. BIOMATERIAIS: TIPOS, APLICAÇÕES E MERCADO

    Directory of Open Access Journals (Sweden)

    Ana Luiza R. Pires

    2015-08-01

    Full Text Available AbstractThe types of compounds used in the production of biomaterials, namely metals, ceramics, synthetic and natural polymers, as well as composite materials, are discussed in the present work, together with details of their application and evolution from biocompatible to bioactive, biodegradable, and biomimetic clinical products. The chemical structure, the three-dimensional structure, and the molecular organization of compounds frequently used in the manufacture of relevant classes of biomaterials are discussed, along with their advantages and some of their major limitations in specific clinical applications. The main chemical, physical, mechanical, and biological requirements of biomaterials categories are presented, as well as typical tissular responses to implanted biomaterials. Reasons for the recent economic growth of the biomaterials market segment are addressed, and the most successful biomaterial categories are discussed, emphasizing areas such as orthopedic and cardiovascular implants, regenerative medicine, tissue engineering, and controlled drug release devices. Finally, the need for the development of innovative and more accessible biomaterials, due to the expected increase in the number of elderly people and the growing trend of personalized medical procedures, is pointed out.

  8. Tribology of implantation bilayers

    International Nuclear Information System (INIS)

    Pivin, J.C.

    1989-01-01

    The mechanical behaviour of implantation films must be analysed in terms of bilayer rheology (laws of mechanical behaviour). Tribology takes into account thermodynamical, chemical and metallurgical parameters to interpret the friction properties of a system as a whole. One can distinguish between alloying effects of ion implantation and structural modifications. Alloying affects the basic properties of the crystal: elasticity, cohesion, mobility of planar defects, and its surface electronic structure, which determines the reactivity with the atmosphere or the friction counterpart (adhesion). Radiation damage and phase changes act more particularly on the modes of gliding and climbing of dislocations, and fracture mechanisms. 105 refs.; 11 figs.; 1 table

  9. [Tinnitus and implants].

    Science.gov (United States)

    Despreaux, G; Tison, P; Van Den Abbeele, T; Moine, A; Frachet, B

    1990-01-01

    The experience with cochlear implantation at Avicenne hospital prompted us to carry out a retrospective study on tinnitus in a population of operated patients. Improvement or disappearance of the symptoms was noted in all cases. These results, which partly match those found in the literature, are probably produced by rehabilitation inhibiting the "deafferentation" mechanisms in analogy with pain phenomena. In some precise cases, which are described, they led us to proposing implantation even though the main, if not sole, complaint of the patient was tinnitus.

  10. 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.

  11. Untreated silicone breast implant rupture

    DEFF Research Database (Denmark)

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

    2004-01-01

    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 untre...

  12. Efectos del tipo de diabetes, estrategias de afrontamiento, sexo y optimismo en el apoyo social

    OpenAIRE

    Rondón, José E.; Lugli, Zoraide

    2013-01-01

    Se desea conocer el efecto del tipo de diabetes, las estrategias de afrontamiento, el sexo, y el optimismo sobre las redes sociales y el apoyo social percibido por sujetos con diabetes. Participaron 103 hombres y 197 mujeres divididos en diabéticos tipo

  13. DESENVOLVIMENTO DE MUDAS DE REPOLHO EM DIFERENTES TIPOS SUBSTRATOS

    Directory of Open Access Journals (Sweden)

    Rebyson Bissaco Guidinelle

    2017-05-01

    Full Text Available Resumo: O objetivo deste trabalho foi avaliar o crescimento vegetativo de mudas de repolho, em diferentes tipos de substrato orgânicos. O experimento foi conduzido em uma casa de vegetação utilizando três substratos, S1 - Comercial; S2 - Vermicomposto; S3 - Serapilheira. Os parâmetros morfoagronômicos avaliados foram o comprimento das mudas, sendo: altura parte aérea (APA, comprimento da maior raiz (CMR e altura total das plântulas (AT que é o somatório da APA e CMR. Os substratos apresentaram diferenças significativas entre si, sendo que a Serapilheira apresentou os melhores resultados de desenvolvimento vegetativo juntamente com o vermicomposto. Concluindo-se que a produção de mudas de repolho pode ser feita a partir de substratos orgânicos alternativos, recomendando a substituição total dos substratos comerciais, visando menor custo na produção das mudas, garantindo boa produtividade e qualidade das mudas de repolho das cultivares estudadas.

  14. Demencia tipo Alzheimer, deterioro cognitivo y toma de decisiones

    Directory of Open Access Journals (Sweden)

    Aurora Moreno

    2011-04-01

    Full Text Available El objetivo de este trabajo es el de conocer cómo es la toma de decisiones en la Demencia Tipo Alzheimer (DTA en situaciones de incertidumbre, si se manifiesta la tendencia al riesgo o no, y la relación que guarda la ejecución con el status cognitivo en cada una de las áreas evaluadas por los test de cribado del deterioro cognitivo propios de las demencias. Participaron 10 pacientes con DTA, y comparados con 10 sujetos controles. Se utilizó la Prueba Cartas (basada en la Iowa Gambling Task, donde los sujetos deben elegir entre varias opciones que entrañan más o menos riesgo, y una batería de cribado del deterioro cognitivo. Los resultados reflejaron que los sujetos con DTA en etapas iniciales presentan cierta tendencia al riesgo en las decisiones que toman y no desarrollan patrones estratégicos de elección. Parece que el deterioro cognitivo y el grado de afectación en las distintas áreas se relaciona con la forma en que toman decisiones.

  15. Estresse em mulheres com Diabetes mellitus tipo 2

    Directory of Open Access Journals (Sweden)

    Juliana Cristina Lessmann

    2011-06-01

    Full Text Available OBJETIVO: O objetivo do estudo foi investigar a relação entre estresse e Diabetes Mellitus Tipo 2 em mulheres. MÉTODO: Estudo transversal prospectivo, desenvolvido com 147 mulheres, utilizando a Escala de Estresse Percebido (PSS. RESULTADOS: Houve associação entre as variáveis testadas, sendo possível inferir que as mulheres com estresse elevado são as que vivenciaram sofrimento e apresentam controle glicêmico alterado, ou seja, com valores superiores a 180 mg/dL. A maioria relatou sofrimento decorrente de problemas nas relações interpessoais, óbito, doença de familiares e solidão. CONCLUSÃO: Mulheres com DM2 que convivem com estresse e/ou sofrimento constituem grupo vulnerável ao desenvolvimento de agravos à saúde demandando aos serviços de saúde o desenvolvimento de estratégias que modifiquem esta situação.

  16. Two-stage implant systems.

    Science.gov (United States)

    Fritz, M E

    1999-06-01

    Since the advent of osseointegration approximately 20 years ago, there has been a great deal of scientific data developed on two-stage integrated implant systems. Although these implants were originally designed primarily for fixed prostheses in the mandibular arch, they have been used in partially dentate patients, in patients needing overdentures, and in single-tooth restorations. In addition, this implant system has been placed in extraction sites, in bone-grafted areas, and in maxillary sinus elevations. Often, the documentation of these procedures has lagged. In addition, most of the reports use survival criteria to describe results, often providing overly optimistic data. It can be said that the literature describes a true adhesion of the epithelium to the implant similar to adhesion to teeth, that two-stage implants appear to have direct contact somewhere between 50% and 70% of the implant surface, that the microbial flora of the two-stage implant system closely resembles that of the natural tooth, and that the microbiology of periodontitis appears to be closely related to peri-implantitis. In evaluations of the data from implant placement in all of the above-noted situations by means of meta-analysis, it appears that there is a strong case that two-stage dental implants are successful, usually showing a confidence interval of over 90%. It also appears that the mandibular implants are more successful than maxillary implants. Studies also show that overdenture therapy is valid, and that single-tooth implants and implants placed in partially dentate mouths have a success rate that is quite good, although not quite as high as in the fully edentulous dentition. It would also appear that the potential causes of failure in the two-stage dental implant systems are peri-implantitis, placement of implants in poor-quality bone, and improper loading of implants. There are now data addressing modifications of the implant surface to alter the percentage of

  17. Semiconductor Ion Implanters

    International Nuclear Information System (INIS)

    MacKinnon, Barry A.; Ruffell, John P.

    2011-01-01

    In 1953 the Raytheon CK722 transistor was priced at $7.60. Based upon this, an Intel Xeon Quad Core processor containing 820,000,000 transistors should list at $6.2 billion! Particle accelerator technology plays an important part in the remarkable story of why that Intel product can be purchased today for a few hundred dollars. Most people of the mid twentieth century would be astonished at the ubiquity of semiconductors in the products we now buy and use every day. Though relatively expensive in the nineteen fifties they now exist in a wide range of items from high-end multicore microprocessors like the Intel product to disposable items containing 'only' hundreds or thousands like RFID chips and talking greeting cards. This historical development has been fueled by continuous advancement of the several individual technologies involved in the production of semiconductor devices including Ion Implantation and the charged particle beamlines at the heart of implant machines. In the course of its 40 year development, the worldwide implanter industry has reached annual sales levels around $2B, installed thousands of dedicated machines and directly employs thousands of workers. It represents in all these measures, as much and possibly more than any other industrial application of particle accelerator technology. This presentation discusses the history of implanter development. It touches on some of the people involved and on some of the developmental changes and challenges imposed as the requirements of the semiconductor industry evolved.

  18. 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.

  19. HA-Coated Implant

    DEFF Research Database (Denmark)

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

    2014-01-01

    of improving the fixation of implants. Of these, hydroxyapatite (HA) is the most widely used and most extensively investigated. HA is highly osseoconductive, and the positive effect is well documented in both basic and long-term clinical research [1–6]. This chapter describes experimental and clinical studies...

  20. 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

  1. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

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

    2011-01-01

    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...

  2. 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.

  3. Funcionamiento psicofisiológico y susceptibilidad a la sintomatología premenstrual en mujeres Tipo A y Tipo B

    Directory of Open Access Journals (Sweden)

    Francesc Palmero

    2002-01-01

    Full Text Available El presente trabajo se centra en explorar el papel que juega el componente emocional del Patrón de Conducta Tipo A (PCTA en diversas áreas relacionadas con la salud. En este contexto nuestra investigación desarrolla dos objetivos diferenciados. El primero trata de constatar la relación entre determinadas características del PCTA y el mecanismo psicofisiológico en una tarea experimental de estrés real (situación de examen, considerando si existen diferencias entre los dos grupos de personas, Tipo A y Tipo B, tanto en la dimensión tónica como en la dimensión fásica de la tasa cardiaca. El segundo de nuestros objetivos trata de establecer la relación existente entre determinadas características del PCTA y la experiencia de sintomatología relacionada con el ciclo menstrual, considerando tanto la sintomatología premenstrual global, como la sintomatología premenstrual específica, diferenciando tres grandes grupos de síntomas: fisiológicos, psicológicos y conductuales. La muestra final estuvo conformada por 28 mujeres Tipo A y 29 mujeres Tipo B. Los instrumentos utilizados fueron el inventario de Actividad de Jenkins (JAS, el calendario menstrual de síntomas de registro diario (CMSRD y un polígrafo que permitió registrar la tasa cardiaca. En cuanto a nuestro primer objetivo, los datos hacen pensar en la existencia de distintos perfiles psicofisiológicos en ambos grupos de mujeres; en el segundo objetivo, parece que las mujeres Tipo A experimentan de forma clara más síntomas psicológicos que las mujeres Tipo B.

  4. Trayectoria de los tornillos pediculares lumbares y sacros: Comparación entre el abordaje por linea media versus el abordaje posterolateral tipo wiltse

    Science.gov (United States)

    Gagliardi, Martín; Guiroy, Alfredo; Molina, Federico Fernández; Fasano, Francisco; Ciancio, Alejandro Morales; Mezzadri, Juan José; Jalón, Pablo

    2017-01-01

    Resumen Objetivos: El objetivo de este estudio fue comparar, en fusiones lumbosacras cortas, el ángulo de convergencia de los tornillos pediculares entre el abordaje posterolateral tipo Wiltse y el abordaje mediano convencional. Método: Se revisaron en forma retrospectiva los controles en tomografía axial computada (TAC) de 76 tornillos pediculares lumbares y sacros colocados por vía posterior, mediante un abordaje mediano convencional (n: 38) o por vía posterolateral transmuscular tipo Wiltse (n: 38). Se incluyeron fusiones lumbosacras cortas desde L3 a S1, en pacientes adultos, con patología degenerativa. Se excluyeron los tornillos con una brecha ósea >4 mm en cualquier dirección, los casos con instrumentaciones pediculares previas y aquellos con curvas en el plano coronal mayores de 20°. Resultados: Considerando la totalidad de los implantes, el ángulo de convergencia fue de 23,3° (+/- 15,82). La angulación promedio, en el grupo AW, fue de 29,3° (+/- 9,72). En el grupo AC, el grado de convergencia de los implantes fue de 17,2° (+/- 10,58). Esta diferencia fue estadísticamente significativa (P < 0,0001). Para el grupo AW, el grado de convergencia según nivel fue el siguiente: L3: 31,2° (+/- 1,9); L4: 31,4° (+/- 2,76); L5: 31,1° (+/- 5,62); S1: 24,2° (+/- 12,16). El promedio del ángulo del tornillo según nivel para el grupo AC fue: L3: 16° (+/- 7,16); L4: 20,3° (+/- 6,9) L5: 15,9° (+/- 13,38); S1: 15,2° (+/- 14,32). Los implantes del grupo AW tuvieron ángulos significativamente más convergentes que el grupo AC en todos los segmentos explorados. Conclusión: En las fusiones lumbosacras cortas, la utilización del abordaje tipo Wiltse permitió la colocación de tornillos pediculares con más convergencia que en el abordaje mediano convencional. La relevancia clínica de este hecho es desconocida y se requerirían trabajos prospectivos randomizados para determinar la misma. PMID:29142777

  5. PRENDIMIENTO DE DOS TIPOS DE INJERTOS EN CACAO EN DISTINTAS FASES LUNARES, SIUNA 2014

    Directory of Open Access Journals (Sweden)

    Mario Reyes Martínez

    2016-05-01

    Full Text Available Sin duda, los productores saben de la influencia lunar y sobre el movimiento de la savia en las plantas en determinados momentos, debido a los conocimientos ancestrales y experiencias adquiridas. Sin embargo, en relación al prendimiento de injertos en cacao (Theobroma cacao, existen pocos estudios científicos que demuestren tales efectos. El objetivo principal del estudio fue comparar los efectos de las fases lunares en el prendimiento de dos tipos de injertos en cacao. Para ello se utilizó un diseño completamente al azar con arreglo bifactorial, con tres repeticiones por cada una de las fases y un universo de 576 plantas. La variable de medición únicamente fue el prendimiento de las plantas que se injertaron. Los datos fueron procesados en el programa Statistical Product and Service Solutions (SPSS versión 21 y se sometieron al análisis de varianza ANDEVA con un nivel de confianza del 95%. Los análisis revelan que existen diferencias significativas para las técnicas de injertación (p=0.011<0.05 y se obtuvo mayores prendimientos en los injertos de yema sobre los de bisel. Con respecto al efecto de las fases lunares sobre los dos tipos de injertos no se encontró evidencia estadística (p=0.950>0.05. En base al análisis combinado de varianza no existen diferencias significativas para la interacción fases lunares y técnicas de injertación puesto que (p=0.761>0.05. Summary There is no doubt the producers know of the moon influence and the sap movement in plants at certain moments, due to the ancestral knowledge and experiences gained. However, in relation to the root taking of grafts in cocoa (Theobroma cacao, there are few scientific studies that demonstrate such effects. The main objective of this study was to compare the effects of moon phases in the root taking of two types of grafts in cocoa. To do this we used a complete randomized design with bifactorial order, with three replays for each of the phases and a universe of 576

  6. O uso de politetrafluoroetileno expandido em tireoplastia tipo I

    Directory of Open Access Journals (Sweden)

    Mello-Filho Francisco Veríssimo de

    2003-01-01

    Full Text Available A paralisia unilateral de prega vocal (PUPV em abdução é uma alteração que produz grande desconforto ao paciente, principalmente pelos distúrbios fonatórios causados. Atualmente dispomos de uma variedade de métodos para seu tratamento. OBJETIVO: Verificar a eficiência, vantagens e desvantagens do uso da fita de politetrafluoretileno expandido (PTFE-e, na medialização de prega vocal (PV paralisada, em abdução. FORMA DE ESTUDO: Coorte Longitudinal. MATERIAL E MÉTODOS: Foram estudados quatro pacientes com diagnóstico clínico-laringoscópico de disfonia por PPVU, em abdução há pelo menos um ano. Os pacientes foram submetidos a avaliação fonoaudiológica e a tireoplastia tipo I para medialização da PV com fita de PTFE-e. Durante o seguimento pós-operatório procedeu-se videolaringoscopia, tomografia computadorizada e fonoterapia. RESULTADOS: Todos os pacientes estão satisfeitos com a qualidade vocal, apresentam medialização estável da PV com a fonocirurgia e bons resultados à avaliação fonoaudiológica. Um paciente apresentou extrusão intra-operatória da fita de PTFE-e, sendo feito um segundo procedimento, sem complicações, seis meses depois. CONCLUSÃO: Na opinião dos autores a fita de PTFE-e se presta com eficiência ao tratamento da PUPV, sem apresentar riscos importantes.

  7. Intervenciones Farmaceuticas en pacientes con Diabetes Mellitus Tipo 2

    Directory of Open Access Journals (Sweden)

    Gladys Mabel Maidana

    Full Text Available Resumen Introducción: La Atención Farmacêutica es la provision responsable de la farmacoterapia con el propósito de alcanzar resultados concretos que mejoren la calidad de vida de los pacientes. Objetivo: Evaluar el impacto de las intervenciones farmacéuticas en pacientes con Diabetes Mellitus Tipo 2. Metodologia: Ensayo Clínico Aleatorizado, con medición de variables antes y después. No probabilísti-co. De conveniencia. Participaron 32 pacientes del grupo intervenido y 32 en grupo control. Se realizaron entrevistas mensuales en un periodo de intervención farmacéutica de 6 meses (desde octubre 2011 hasta junio 2012. Se registraron solo 3 abandonos. Resultados: La edad de los pacientes fue 55,6±10,6 anos. Los pacientes del grupo intervenido mejoraron la glicemia en 34%, donde 24 pacientes tenian el valor (< 130 mg/dL; la hemoglobina glicosilada mejoró 1,9%, donde 15 pacientes lograron los parámetros deseados (< 6,5%. La calidad de vida del grupo inter-venido aumentó de (56,3 a 71,3 % y fue medido con el cuestionario SF-36. En el grupo intervenido se encontraron 80 problemas relacionados con medicamentos, en 27 pacientes, se resolvieron 59; al final del estudio 12 pacientes resolvieron todos los problemas relacionados con medicamentos; se realizaron 254 intervenciones farmacêuticas, el nivel de conocimiento de los pacientes sobre la enfermedad mejoró en 41%, el conocimiento sobre sus medicamentos mejoró en 53%. Conclusión: Las intervenciones farmacêuticas mejoraron los parámetros clínicos de glicemia, hemoglobina glicosilada, optimizaron el uso de medicamentos, disminuyeron los problemas relacionados con medicamentos, mejoraron la calidad de vida de los pacientes.

  8. Distribución espacial de fibroblastos endoneurales en cultivos tridimensionales en geles de colágeno Tipo I

    Directory of Open Access Journals (Sweden)

    Leslie Yaneth Leal Mejía

    2002-07-01

    Full Text Available SaludRESUMENEn la actualidad los cultivos celulares tridimensionales son muy utilizados, ya que imitan lascondiciones in vivode las células. Uno de los cultivos más desarrollados es el de fibroblastosdérmicos dentro de geles de colágeno en forma de lenteja, los cuales se contraen de un 70%a un 80% durante las primeras 24 horas de cultivo. El objetivo inicial de este trabajo fue aislarfibroblastos endoneurales (FE del nervio ciático de ratones ICR, mantenerlos en cultivo enmonocapa y luego en cultivo tridimensional en geles cilíndricos de colágeno tipo I de 1,6 mmde diámetro y 3 mm de largo, formados en las prótesis de silicona empleadas para regeneraciónde nervios periféricos; imitando las condiciones del nervio in vivopara que pueda ser emplea-dos en regeneración. Inicialmente se retira epineuro y perineuro del nervio, dejando sólo elendoneuro que se disocia con colagenasa (500U/ml y luego se le hace una disociación me-cánica. Las células libres, se cultivan en monocapa con DMEM suplementado con 20% suerobovino fetal, logrando un 95% de pureza en cultivo primario; en los subcultivos se purifican yamplifican los FE. Estos se aislan y se mezclan con una solución de colágeno tipo I a 0,5mg/mlpara la formación de los geles, teniendo en cuenta que cada gel contenga 50.000 fibroblastos,se introduce la mezcla dentro de las prótesis de silicona y se dejan gelificar, siguiendo el mismoprocedimiento se formaron geles sin células; una vez formados los geles se liberan de las cáma-ras y se cultivan en suspensión 1, 3, 5, 7, 15 y 30 días. Al cumplirse cada uno de los tiemposde cultivo, se analizó la apariencia del colágeno y la distribución de los FE en microscopíaóptica y de fluorescencia. Los cultivos primarios de FE se obtuvieron a los 5 días, lograndoacortar el tiempo de confluencia entre 15 y 20 días con respecto a lo reportado en la literatura;un dato novedoso fue la purificación total de los FE en el primer subcultivo

  9. 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...

  10. 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...... of radiation therapy was associated with a non-significantly increased risk of reoperation after both 1-stage (HR = 1.4; 95% CI: 0.7-2.5) and 2-stage (HR = 1.6; 95% CI: 0.9-3.1) procedures. Reconstruction failure was highest (13.2%) in the 2-stage procedures with a history of radiation therapy. Breast...... reconstruction approaches other than implants should be seriously considered among women who have received radiation therapy....

  11. Piezosurgery in implant dentistry

    Science.gov (United States)

    Stübinger, Stefan; Stricker, Andres; Berg, Britt-Isabelle

    2015-01-01

    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. PMID:26635486

  12. Ion implantation in metals

    International Nuclear Information System (INIS)

    Vook, F.L.

    1977-02-01

    The application of ion beams to metals is rapidly emerging as a promising area of research and technology. This report briefly describes some of the recent advances in the modification and study of the basic properties of metals by ion implantation techniques. Most of the research discussed illustrates some of the new and exciting applications of ion beams to metals which are under active investigation at Sandia Laboratories, Albuquerque

  13. The breast implant controversy.

    Science.gov (United States)

    Cook, R R; Harrison, M C; LeVier, R R

    1994-02-01

    The breast implant issue is a "bad news/good news" story. For many women with implants, the controversy has caused a fair degree of anxiety which may or may not be resolved as further information becomes available. It has also taken its toll on Dow Corning. Whole lines of medical products have been eliminated or are being phase out. The development of new medical applications has been terminated. As a consequence, employees have lost their jobs. What the effect will be on the biomedical industry as a whole remains to be seen (11). While silicones have been an important component in various medical devices, it is likely that other materials can be used as replacements. However, suppliers of non-silicone materials are also reevaluating their role in this market. For example, Du Pont, the nation's largest chemical company, has determined that the unpredictable and excessive costs of doing business with manufacturers of implantable medical devices no longer justifies the unrestricted sale of standard raw materials into this industry. Other companies are quietly following suit. On the up side, it is possible that the research being driven by this controversy will result in a greater understanding of the immunologic implications of xenobiotics, of the importance of nonbiased observations, of the need for ready access to valid data sets, and of the opportunity for valid scientific information to guide legal decisions. Only time will tell.

  14. Visualização dos padrões de variação da taxa de mortalidade infantil no Rio Grande do Sul, Brasil: comparação entre as abordagens Bayesiana Empírica e Totalmente Bayesiana Patterns of variation in the infant mortality rate in Rio Grande do Sul State, Brazil: comparison of empirical Bayesian and fully Bayesian approaches

    Directory of Open Access Journals (Sweden)

    Sabrina Letícia Couto da Silva

    2011-07-01

    Full Text Available A mortalidade infantil é um sensível indicador de saúde. Conhecer o seu perfil geográfico auxilia na formulação de estratégias de saúde pública. O mapeamento de doenças tem por objetivo descrever a distribuição geográfica das taxas de mortalidade ou incidência de doenças por intermédio de mapas. Em razão da alta instabilidade das taxas brutas quando há pequenas áreas, utilizam-se os métodos de suavização bayesiana, que se valem de informações de toda a região ou da vizinhança para estimar as taxas. O artigo faz a comparação entre os métodos Bayesiano Empírico e Totalmente Bayesiano para as taxas de mortalidade infantil (dados acumulados de 2001 a 2004 no Rio Grande do Sul, Brasil. O trabalho aponta as vantagens do uso dos estimadores bayesianos na visualização espacial dos mapas. Os métodos Bayesianos Empíricos apresentaram resultados muito semelhantes aos dos métodos Totalmente Bayesianos e possuem a grande vantagem de ser de fácil utilização por profissionais da área de saúde, destacando igualmente os principais padrões espaciais da taxa de mortalidade no Rio Grande do Sul no período estudado.Infant mortality is considered a sensitive health indicator, and knowledge of its geographical profile is essential for formulating appropriate public health policies. Disease mapping aims to describe the geographical distribution of disease incidence and mortality rates. Due to the heavy instability of crude rates in small areas, methods involving Bayesian smoothing of rates are used, drawing on information for the whole area or neighborhood to estimate the event rate. The current study compares empirical Bayesian (EB and fully Bayesian (FB methods for infant mortality rates (accumulated data from 2001 to 2004 in Rio Grande do Sul State, Brazil. This study highlights the advantages of Bayesian estimators for viewing and interpreting maps. For the problem at hand, EB and FB methods showed quite similar results and

  15. Diseño de antenas tipo DRA (Dielectric Resonator Antennas)

    OpenAIRE

    Soria Gallego, Juan

    2013-01-01

    En este trabajo se va a estudiar un tipo de antenas conocidas como antenas resonantes dieléctricas (DRA) desde el punto de vista de diseño y características radiantes, así como de sus posibles aplicaciones. Las DRAs son un tipo de antenas cada vez más usadas ya que presentan numerosas ventajas respecto a otro tipo de antenas, entre ellas que son fáciles de diseñar, baratas y muy eficientes. Por ello, cada vez aparecen nuevos diseños y nuevas aplicaciones. Entre ellas se ha extendido el uso...

  16. Influencia del contacto precoz, nacionalidad, tipo de parto y prematuridad en la lactancia materna

    OpenAIRE

    Ana Belén Laviña Castan

    2015-01-01

    Conocer si en el HUMS existe asociación entre lactancia materna y nacionalidad, prematuridad, tipo de parto, contacto precoz piel con piel. Estudio de cohortes, en una muestra de 541 puérperas del HUMS en octubre-noviembre 2011. Las variables: nacionalidad, tipo de parto, contacto precoz, parto prematuro e inicio lactancia materna se recogieron antes del alta hospitalaria mediante cuestionario. A los dos meses postparto se contactó telefónicamente con las madres para conocer el tipo de lactan...

  17. 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.

  18. Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

    OpenAIRE

    Goñi, S.; Guerrero, A.

    2006-01-01

    En este trabajo se discute la influencia del tipo de curado y de un aditivo reductor de la demanda de agua en la actividad hidráulica de un cemento belítico de cenizas volantes de alto contenido en cal denominado (CBCV-2-A). Este cemento ha sido sintetizado por una ruta húmeda hidrotermal con posterior calcinación, empleando ceniza volante de alto contenido en cal (ASTM tipo C) como materia prima. La actividad hidráulica se ha estudiado en la pasta de cemento, durante un periodo de 180 días, ...

  19. Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

    OpenAIRE

    Goñi Elizalde, Sara; Guerrero Bustos, Ana María

    2006-01-01

    En este trabajo se discute la influencia del tipo de curado y de un aditivo reductor de la demanda de agua en la actividad hidráulica de un cemento belítico de cenizas volantes de alto contenido en cal denominado (CBCV-2-A). Este cemento ha sido sintetizado por una ruta húmeda hidrotermal con posterior calcinación, empleando ceniza volante de alto contenido en cal (ASTM tipo C) como materia prima. La actividad hidráulica se ha estudiado en la pasta de cemento, durante un periodo de 180 ...

  20. Sub-meninges implantation reduces immune response to neural implants.

    Science.gov (United States)

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

    2013-04-15

    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. Published by Elsevier B.V.

  1. Improving osseointegration of dental implants.

    Science.gov (United States)

    Elias, Carlos Nelson; Meirelles, Luiz

    2010-03-01

    In the beginning of implantology, the procedures adopted for treating patients were performed in two surgical phases with an interval of 3-6 months. Nowadays, it is possible to insert and load a dental implant in the same surgical procedure. This change is due to several factors, such as improvement of surgical technique, modifications of the implant design, increased quality of implant manufacturing, development of the surgical instruments' quality, careful patient screening and adequate treatment of the implant surface. The clinical results show that adequate treatment of surfaces is crucial for reducing healing time and treating at-risk patients. The surface properties of dental implants can be significantly improved at the manufacturing stage, affecting cells' activity during the healing phase that will ultimately determine the host tissue response, a fundamental requirement for clinical success. This review focuses on different types of dental implant surfaces and the influence of surface characteristics on osseointegration.

  2. 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.

  3. Dental implants in growing children

    Directory of Open Access Journals (Sweden)

    S K Mishra

    2013-01-01

    Full Text Available The replacement of teeth by implants is usually restricted to patients with completed craniofacial growth. The aim of this literature review is to discuss the use of dental implants in normal growing patients and in patients with ectodermal dysplasia and the influence of maxillary and mandibular skeletal and dental growth on the stability of those implants. It is recommended that while deciding the optimal individual time point of implant insertion, the status of skeletal growth, the degree of hypodontia, and extension of related psychological stress should be taken into account, in addition to the status of existing dentition and dental compliance of a pediatric patient.

  4. Printing of Titanium implant prototype

    International Nuclear Information System (INIS)

    Wiria, Florencia Edith; Shyan, John Yong Ming; Lim, Poon Nian; Wen, Francis Goh Chung; Yeo, Jin Fei; Cao, Tong

    2010-01-01

    Dental implant plays an important role as a conduit of force and stress to flow from the tooth to the related bone. In the load sharing between an implant and its related bone, the amount of stress carried by each of them directly related to their stiffness or modulus. Hence, it is a crucial issue for the implant to have matching mechanical properties, in particular modulus, between the implant and its related bone. Titanium is a metallic material that has good biocompatibility and corrosion resistance. Whilst the modulus of the bulk material is still higher than that of bone, it is the lowest among all other commonly used metallic implant materials, such as stainless steel or cobalt alloy. Hence it is potential to further reduce the modulus of pure Titanium by engineering its processing method to obtain porous structure. In this project, porous Titanium implant prototype is fabricated using 3-dimensional printing. This technique allows the flexibility of design customization, which is beneficial for implant fabrication as tailoring of implant size and shape helps to ensure the implant would fit nicely to the patient. The fabricated Titanium prototype had a modulus of 4.8-13.2 GPa, which is in the range of natural bone modulus. The compressive strength achieved was between 167 to 455 MPa. Subsequent cell culture study indicated that the porous Titanium prototype had good biocompatibility and is suitable for bone cell attachment and proliferation.

  5. Cochlear implantation in Mondini dysplasia.

    Science.gov (United States)

    Daneshi, Ahmad; Hassanzadeh, Saeid; Abasalipour, Parvaneh; Emamdjomeh, Hessamaddin; Farhadi, Mohammad

    2003-01-01

    The use of cochlear implantation to treat patients with inner ear malformations such as Mondini dysplasia has been increasingly successful. Until now, conventional hearing aids in these patients have not performed well. Consequently, the hearing problem for patients with this condition has been somewhat improved with the use of cochlear implants. Various results of cochlear implantation have been reported in these patients so far. This is a report of 5 patients with Mondini malformation who have undergone cochlear implant surgery. Copyright 2003 S. Karger AG, Basel

  6. Implant-retained maxillary overdentures.

    Science.gov (United States)

    Eckert, Steven E; Carr, Alan B

    2004-07-01

    Overdentures supported by osseointegrated implants overcome many of the complications observed with overdentures supported by natural teeth. Dental implants are free of biologic consequences associated with natural teeth, such as dental caries and periodontal disease. Bone undercuts adjacent to implants do not mimic those found adjacent to natural tooth roots. Implants are used to provide predictable retention, support, and stability for overdenture prostheses. When lip or facial support is required, the overdenture is the treatment of choice. Likewise the overdenture may improve phonetic deficiencies associated with alveolar bone loss.

  7. Cochlear implants in Waardenburg syndrome.

    Science.gov (United States)

    Cullen, Robert D; Zdanski, Carlton; Roush, Patricia; Brown, Carolyn; Teagle, Holly; Pillsbury, Harold C; Buchman, Craig

    2006-07-01

    Waardenburg syndrome is an autosomal-dominant syndrome characterized by dystopia canthorum, hyperplasia of the eyebrows, heterochromia irides, a white forelock, and sensorineural hearing loss in 20% to 55% of patients. This patient population accounts for approximately 2% of congenitally deaf children. The purpose of this retrospective case review was to describe the outcomes for those children with Waardenburg syndrome who have undergone cochlear implantation. Pediatric cochlear implant recipients with documented evidence of Waardenburg syndrome underwent retrospective case review. All patients received their cochlear implants at the study institution followed by outpatient auditory habilitation. Charts were reviewed for etiology and duration of deafness, age at time of cochlear implantation, perioperative complications, duration of use, and performance outcomes. Results of standard tests batteries for speech perception and production administered as a part of the patients' auditory habilitation were reviewed. Seven patients with Waardenburg syndrome and cochlear implants were identified. The average age at implantation was 37 months (range, 18-64 months) and the average duration of use was 69 months (range, 12-143 months). All of these patients are active users of their devices and perform very well after implantation. There were no major complications in this small group of patients. Children with congenital sensorineural hearing loss without other comorbidities (e.g., developmental delay, inner ear malformations) perform well when they receive cochlear implantation and auditory habilitation. Patients with Waardenburg syndrome can be expected to have above-average performance after cochlear implantation.

  8. 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.

  9. Genótipos de haptoglobina e hipertensão refratária em pacientes com diabete melito tipo 2

    Directory of Open Access Journals (Sweden)

    Vânia Pereira Albuquerque Wobeto

    2011-10-01

    Full Text Available FUNDAMENTO: Tem sido sugerido que o polimorfismo da haptoglobina pode influenciar na patogênese das complicações microvasculares e macrovasculares em pacientes diabéticos. OBJETIVO: O objetivo principal deste estudo transversal foi de realizar uma investigação da existência ou não de uma associação entre os genótipos de haptoglobina e a prevalência de eventos isquêmicos cardiovasculares (angina estável, angina instável e infarto agudo do miocárdio, hipertensão arterial sistêmica, hipertensão refratária, obesidade e dislipidemia em 120 pacientes com diabete melito tipo 2, seguidos no Hospital Universitário da Unicamp, em Campinas, Estado de São Paulo. MÉTODOS: A genotipagem da haptoglobina foi realizada por reações em cadeia da polimerase alelo-específicas. As frequências dos genótipos de haptoglobina foram comparadas com a presença/ausência de doença cardiovascular, hipertensão arterial sistêmica, hipertensão refratária, obesidade e dislipidemia; medições de pressão arterial sistólica e diastólica; glicemia, colesterol (total, lipoproteínas de alta densidade - HDL e lipoproteínas de baixa densidade - LDL e triglicerídeos; assim como níveis de creatinina sérica. RESULTADOS: Embora nenhuma associação entre o genótipo de haptoglobina e a presença de doença cardiovascular tenha sido identificada, encontramos um excesso significativo de pacientes com o genótipo Hp2-1 entre as pessoas com hipertensão refratária, que também apresentavam uma maior pressão arterial sistólica e diastólica e níveis de colesterol total e LDL. CONCLUSÃO: Nossos resultados sugerem que os pacientes com diabete melito tipo 2 com o genótipo Hp2-1 podem apresentar uma maior chance de desenvolver hipertensão refratária. Estudos adicionais em populações diabéticas são necessários para confirmar esses achados.

  10. Transferências lipídicas para HDL em diabéticos tipo 2: associações com microalbuminúria, estatina e insulina Transferencias lipídicas hacia HDL en diabéticos tipo 2: asociaciones con microalbuminuria, estatina y insulina Lipid transfer to HDL in type-2 diabetic patients: associations with microalbuminuria, statin, and insulin

    Directory of Open Access Journals (Sweden)

    Gilson Soares Feitosa-Filho

    2009-02-01

    Full Text Available FUNDAMENTO: O diabete melito tipo 2 (DM2 é um fator de risco isolado para coronariopatia, principalmente quando associado à microalbuminúria (MA. Alterações estruturais e funcionais das lipoproteínas não são totalmente esclarecidas nesse contexto. OBJETIVO: Avaliar a transferência de lípides para HDL (T em pacientes DM2 e a associação com a presença da MA e com o tratamento com estatina ou insulina. MÉTODOS: Estudamos 33 pacientes com DM2 e 34 controles pareados para idade. Uma nanoemulsão lipídica artificial radiomarcada com ³H-Triglicéride (TG e 14C-colesterol livre (CL ou ³H-colesterol éster (CE e 14C-fosfolípide (FL foi incubada com plasma. A nanoemulsão e as lipoproteínas foram precipitadas, exceto a HDL, que teve sua radioatividade contada. RESULTADOS: A TFL (% foi maior no grupo com DM2 que no grupo-controle (25,2±3,2 e 19,7±3,2 respectivamente; p FUNDAMENTO: La diabetes mellitus tipo 2 (DM2 es un factor de riesgo aislado para coronariopatía, principalmente cuando asociado a la microalbuminuria (MA. Alteraciones estructurales y funcionales de las lipoproteínas no están totalmente aclaradas en ese contexto. OBJETIVO: Evaluar no sólo la transferencia de lípidos hacia HDL (T en pacientes DM2, sino también la asociación tanto con la presencia de la MA como con el tratamiento con estatina o insulina. MÉTODOS: Estudiamos a 33 pacientes con DM2 y 34 controles pareados para edad. Se incubó con plasma una nanoemulsión lipídica artificial radiomarcada con ³H-Triglicérido (TG y 14C-colesterol libre (CL o ³H-colesterol esterificado (CE y 14C-fosfolípido (FL. Se procedió a la precipitación de la nanoemulsión y de las lipoproteínas, con excepción de la HDL, que tuvo su radioactividad contada. RESULTADOS: El valor de TFL (% resultó mayor en el grupo con DM2 en confrontación con el grupo-control (25,2±3,2 y 19,7±3,2 respectivamente; p BACKGROUND: Type-2 diabetes mellitus (T2DM is an isolated risk factor

  11. 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...

  12. 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.

  13. [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

  14. 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.

  15. 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

  16. Labyrinthectomy with cochlear implantation.

    Science.gov (United States)

    Zwolan, T A; Shepard, N T; Niparko, J K

    1993-05-01

    Numerous reports indicate that the cochlea remains responsive to electrical stimulation following labyrinthectomy. We report a case of a 47-year-old woman with a severe to profound sensorineural hearing loss from birth, who developed episodic vertigo with symptoms suggestive of delayed onset endolymphatic hydrops. Following 8 months of failed medical and vestibular rehabilitation management, a right-sided labyrinthectomy combined with cochlear implantation was performed without complication. Postoperatively the patient was free of vertigo. Attempts to activate the patient's device between 4 to 12 weeks after surgery were unsuccessful as stimulation of the electrodes resulted in discomfort. However, all 20 electrodes elicited comfortable hearing sensations 16 weeks postsurgery. One year after the successful activation, the patient demonstrated improved sound awareness and speech recognition with the implant when compared with preoperative performance with a hearing aid. This case study suggests that electrical detection thresholds with prosthetic stimulation may be unstable in the recently labyrinthectomized ear but supports and extends prior observations of preserved cochlear responsiveness after labyrinthectomy.

  17. Ion implantation and amorphous metals

    International Nuclear Information System (INIS)

    Hohmuth, K.; Rauschenbach, B.

    1981-01-01

    This review deals with ion implantation of metals in the high concentration range for preparing amorphous layers (>= 10 at%, implantation doses > 10 16 ions/cm 2 ). Different models are described concerning formation of amorphous phases of metals by ion implantation and experimental results are given. The study of amorphous phases has been carried out by the aid of Rutherford backscattering combined with the channeling technique and using transmission electron microscopy. The structure of amorphous metals prepared by ion implantation has been discussed. It was concluded that amorphous metal-metalloid compounds can be described by a dense-random-packing structure with a great portion of metal atoms. Ion implantation has been compared with other techniques for preparing amorphous metals and the adventages have been outlined

  18. Ion implantation: an annotated bibliography

    International Nuclear Information System (INIS)

    Ting, R.N.; Subramanyam, K.

    1975-10-01

    Ion implantation is a technique for introducing controlled amounts of dopants into target substrates, and has been successfully used for the manufacture of silicon semiconductor devices. Ion implantation is superior to other methods of doping such as thermal diffusion and epitaxy, in view of its advantages such as high degree of control, flexibility, and amenability to automation. This annotated bibliography of 416 references consists of journal articles, books, and conference papers in English and foreign languages published during 1973-74, on all aspects of ion implantation including range distribution and concentration profile, channeling, radiation damage and annealing, compound semiconductors, structural and electrical characterization, applications, equipment and ion sources. Earlier bibliographies on ion implantation, and national and international conferences in which papers on ion implantation were presented have also been listed separately

  19. Resgate vegetativo por alporquia de genótipos adultos de urucum (Bixa orellana L.

    Directory of Open Access Journals (Sweden)

    Nilton César Mantovani

    2010-09-01

    Full Text Available Este trabalho teve por objetivos avaliar a técnica de alporquia visando ao resgate vegetativo de genótipos de urucum (Bixa orellana L. e a obtenção de plantas fornecedoras de propágulos para processos de propagação clonal. Foram utilizadas dez plantas matrizes de urucum, com 12 anos de idade, obtidas partindo do cruzamento artificial entre os genótipos "Fruto Verde Piloso" X "Fruto Vermelho Liso". Os alporques foram realizados em ramos de 1 a 2 cm de diâmetro, utilizando-se como substrato uma mistura de vermiculita e musgo. Foi avaliado o efeito (1 do tipo de anelamento da casca dos ramos (total ou parcial, com 1 cm de comprimento, (2 do AIB (ácido indol-3-butírico a 0 e 4,92 mM aplicado em papel filtro e (3 do tipo de proteção dos alporques (filmes plásticos transparente ou preto ou tecido tencel, no enraizamento de alporque dos dez genótipos. A técnica de alporquia proporcionou o enraizamento de ramos dos dez genótipos avaliados, com eficiência variável de 20 a 100%, havendo efeito do genótipo sobre a frequência de enraizamento. A sobrevivência desses alporques foi de 100% após o plantio quando estes foram produzidos com anelamento total, tratados com AIB e protegidos com plástico transparente. Em casa de vegetação os alporques desenvolveram ramos partindo da brotação de gemas caulinares constituindo estoques de explantes apropriados para serem utilizados como estacas ou como fontes de segmentos nodais para a propagação in vitro desta espécie.

  20. Diabetes tipo 2 en niños: Serie de casos

    Directory of Open Access Journals (Sweden)

    Helard Manrique-Hurtado

    2015-01-01

    Full Text Available Objetivos: Describir las características clínicas y bioquímicas de un grupo de niños y adolescentes con diagnóstico reciente de diabetes tipo 2. Material y métodos: Estudio descriptivo, retrospectivo, tipo de serie de casos. Se definió caso al niño o adolescente con glucosa plasmática en ayunas mayor a 126 mg/dl, ausencia de antiGAD y péptido C mayor a 1,5 ng/dl. Se excluyeron a los pacientes con diagnóstico previo de diabetes mellitus tipo 1, diabetes tipo MODY o diabetes secundaria a uso de fármacos. Resultados: La edad media fue 14,3 años, 59% fueron mujeres y 43% tenía por lo menos un padre con diabetes tipo 2. Al momento del diagnóstico, el índice de masa corporal fue 32,8 kg/m2, 85% tenía acantosis nigricans y 68% estaba en estadio Tanner IV y V. El tratamiento inicial incluyó el uso de hipoglicemiantes orales en 75% de los casos, siendo más frecuente el uso de metformina (64,3%. Solamente el 41% de los pacientes recibía algún tipo de insulina. Conclusiones: Los niños y adolescentes con diabetes tipo 2, tienen una frecuencia aumentada de obesidad/sobrepeso, acantosis nigricans y antecedente familiar de DM2. En general, tienen mal control metabólico y reciben metformina como tratamiento inicial.

  1. Tribological properties of nitrogen implanted and boron implanted steels

    International Nuclear Information System (INIS)

    Kern, K.T.

    1996-01-01

    Samples of a steel with high chrome content was implanted separately with 75 keV nitrogen ions and with 75 keV boron ions. Implanted doses of each ion species were 2-, 4-, and 8 x 10 17 /cm 2 . Retained doses were measured using resonant non-Rutherford Backscattering Spectrometry. Tribological properties were determined using a pin-on-disk test with a 6-mm diameter ruby pin with a velocity of 0.94 m/min. Testing was done at 10% humidity with a load of 377 g. Wear rate and coefficient of friction were determined from these tests. While reduction in the wear rate for nitrogen implanted materials was observed, greater reduction (more than an order of magnitude) was observed for boron implanted materials. In addition, reduction in the coefficient of friction for high-dose boron implanted materials was observed. Nano-indentation revealed a hardened layer near the surface of the material. Results from grazing incidence x-ray diffraction suggest the formation of Fe 2 N and Fe 3 N in the nitrogen implanted materials and Fe 3 B in the boron implanted materials. Results from transmission electron microscopy will be presented

  2. Cochlear implantation in late-implanted adults with prelingual deafness.

    Science.gov (United States)

    Most, Tova; Shrem, Hadas; Duvdevani, Ilana

    2010-01-01

    The purpose of this study was to examine the effect of cochlear implantation (CI) on prelingually deafened participants who were implanted as adults. The effect of the CI was examined with regard to the following variables: communication, family, social skills, education, and work satisfaction with one's life, loneliness, and self-esteem. Thirty-eight adults participated. Four self-report questionnaires were used at 2 points in time: before and after CI. The research findings show significant differences in the reports of most variables before and after implantation. The participants felt better with regard to communication, social skills, education, and work and satisfaction with one's life after implantation in comparison to their feelings before implantation. Furthermore, they felt less lonely after implantation. However, there were no significant differences before and after implantation regarding their feelings within the family and regarding their self-esteem. The results demonstrated the need to evaluate the benefits resulting from the CI not only with traditional clinical measures but with additional measures as well. Furthermore, they demonstrated the benefit of the CI on the positive psychosociological implications of prelingually deafened adults. Copyright © 2010 Elsevier Inc. All rights reserved.

  3. A Retrospective Analysis of Ruptured Breast Implants

    Directory of Open Access Journals (Sweden)

    Woo Yeol Baek

    2014-11-01

    Full Text Available BackgroundRupture is an important complication of breast implants. Before cohesive gel silicone implants, rupture rates of both saline and silicone breast implants were over 10%. Through an analysis of ruptured implants, we can determine the various factors related to ruptured implants.MethodsWe performed a retrospective review of 72 implants that were removed for implant rupture between 2005 and 2014 at a single institution. The following data were collected: type of implants (saline or silicone, duration of implantation, type of implant shell, degree of capsular contracture, associated symptoms, cause of rupture, diagnostic tools, and management.ResultsForty-five Saline implants and 27 silicone implants were used. Rupture was diagnosed at a mean of 5.6 and 12 years after insertion of saline and silicone implants, respectively. There was no association between shell type and risk of rupture. Spontaneous was the most common reason for the rupture. Rupture management was implant change (39 case, microfat graft (2 case, removal only (14 case, and follow-up loss (17 case.ConclusionsSaline implants have a shorter average duration of rupture, but diagnosis is easier and safer, leading to fewer complications. Previous-generation silicone implants required frequent follow-up observation, and it is recommended that they be changed to a cohesive gel implant before hidden rupture occurs.

  4. [Maintenance care for dental implant].

    Science.gov (United States)

    Kamoi, K

    1989-10-01

    Dental implant has tried at the early stage in 19th century recovering an oral function and esthetics. Technological revolutions in biochemical and new materials have developed on the remarkable change in the dental implants, nowadays we call the three generation therapy for dental implantology. There are many kinds of methods and techniques in dental implants, however a lot of troublesome complication on the process of surgical phase, construction of prothodontics and prognosis of maintenance care. In the proceedings of this symposium, I would like to propose you how to manage the maintenance care for various kind of dental implants through the methodology and case presentations. Tendenay and future for dental implants The current outlook of dental implant has increasing supply and demand not only dentists but also patients. According to Japanese Welfare Ministry's report in 1987, average missing teeth over sixty years old generations are approximately 42% in accordance with NIDR (U.S.A.) research. They are missed on ten over teeth in full 28th teeth dentitions owing to dental caries and periodontal diseases. Generally speaking, latent implant patients are occupied on the same possibility of needs for dental implants both Japan and U.S.A. Management of maintenance care The patients hardly recognized the importance of plaque control for the maintenance care in the intraoral condition after implantation. Dentists and dental staffs must be instruct patients for importance of plaque removal and control, because they already had forgotten the habit of teeth cleaning, especially in the edenturous conditions. 1) Concept of establishment in oral hygiene. Motivation and instruction for patients include very important factors in dental implants as well as in periodontal diseases. Patients who could not achieve on good oral hygiene levels obtained no good results in the long term observations. To establish good oral hygiene are how to control supra plaque surrounding tissues

  5. Ion implantation apparatus

    International Nuclear Information System (INIS)

    Forneris, J.L.; Hicks, W.W.; Keller, J.H.; McKenna, C.M.; Siermarco, J.A.; Mueller, W.F.

    1981-01-01

    The invention relates to ion bombardment or implantation apparatus. It comprises an apparatus for bombarding a target with a beam of ions, including an arrangement for measuring the ion beam current and controlling the surface potential of the target. This comprises a Faraday cage formed, at least in part, by the target and by walls adjacent to, and electrically insulated from, the target and surrounding the beam. There is at least one electron source for supplying electrons to the interior of the Faraday cage and means within the cage for blocking direct rectilinear radiation from the source to the target. The target current is measured and combined with the wall currents to provide a measurement of the ion beam current. The quantity of electrons supplied to the interior of the cage can be varied to control the target current and thereby the target surface potential. (U.K.)

  6. Implantable biochemical fuel cell

    Energy Technology Data Exchange (ETDEWEB)

    Richter, G; Rao, J R

    1978-01-05

    Implantable biochemical fuel cells for the operation of heart pacemakers or artificial hearts convert oxidisable body substances such as glucose on the anode side and reduce the oxygen contained in body fluids at the cathode. The anode and cathode are separated by membranes which are impermeable to albumen and blood corpuscles in body fluids. A chemical shortcircuit cannot occur in practice if, according to the invention, one or more selective oxygen electrodes with carbon as catalyst are arranged so that the mixture which diffuses into the cell from body fluids during operation reaches the fuel cell electrode through the porous oxygen electrode. The membranes used must be permeable to water. Cellulose, polymerised polyvinyl alcohol or an ion exchanger with a buffering capacity between pH5 and 8 act as permeable materials.

  7. 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.

  8. Basic research on maxillofacial implants

    Energy Technology Data Exchange (ETDEWEB)

    Matsui, Yoshiro [Showa Univ., Tokyo (Japan). School of Dentistry

    2001-11-01

    Osseointegrated implants have begun to be used not only in general practice in dentistry but also in various clinical situations in the maxillofacial region. The process has yielded three problems: the spread of application, new materials and diagnostic methods, and management for difficult situations. This paper presents basic data and clinical guidelines for new applications, it investigates the characteristics of the materials and the usefulness of a new diagnostic method, and it studies effective techniques for difficult cases. The results obtained are as follows: Investigations into the spreading application. The lateral and superior orbital rim have sufficient bone thickness and width for the implant body to be placed. Osseointegrated implants, especially by the fixed bridge technique, are not recommended in the craniofacial bone and jaws of young children. Implant placement into bone after/before irradiation must be performed in consideration of impaired osteogenesis, the decrease of trabecular bone, and the time interval between implantation and irradiation. Investigations into materials and diagnostic methods. Hydroxyapatite-coated and titanium implants should be selected according to the characteristics of the materials. A dental simulating soft may also be applicable in the craniofacial region. Investigations into the management of difficult cases. Hyperbaric oxygen therapy (HBO), bone morphogenetic protein (BMP), and tissue engineering should be useful for improving the quality and increasing the quantity of bone where implants are placed. Soft tissue around implants placed in the reconstructed area should be replaced with mucosal tissue. The data obtained here should be useful for increasing the efficiency of osseointegrated implants, but further basic research is required in the future. (author)

  9. Basic research on maxillofacial implants

    International Nuclear Information System (INIS)

    Matsui, Yoshiro

    2001-01-01

    Osseointegrated implants have begun to be used not only in general practice in dentistry but also in various clinical situations in the maxillofacial region. The process has yielded three problems: the spread of application, new materials and diagnostic methods, and management for difficult situations. This paper presents basic data and clinical guidelines for new applications, it investigates the characteristics of the materials and the usefulness of a new diagnostic method, and it studies effective techniques for difficult cases. The results obtained are as follows: Investigations into the spreading application. The lateral and superior orbital rim have sufficient bone thickness and width for the implant body to be placed. Osseointegrated implants, especially by the fixed bridge technique, are not recommended in the craniofacial bone and jaws of young children. Implant placement into bone after/before irradiation must be performed in consideration of impaired osteogenesis, the decrease of trabecular bone, and the time interval between implantation and irradiation. Investigations into materials and diagnostic methods. Hydroxyapatite-coated and titanium implants should be selected according to the characteristics of the materials. A dental simulating soft may also be applicable in the craniofacial region. Investigations into the management of difficult cases. Hyperbaric oxygen therapy (HBO), bone morphogenetic protein (BMP), and tissue engineering should be useful for improving the quality and increasing the quantity of bone where implants are placed. Soft tissue around implants placed in the reconstructed area should be replaced with mucosal tissue. The data obtained here should be useful for increasing the efficiency of osseointegrated implants, but further basic research is required in the future. (author)

  10. Surface modifications of dental implants.

    Science.gov (United States)

    Stanford, C M

    2008-06-01

    Dental implant surface technologies have been evolving rapidly to enhance a more rapid bone formation on their surface and hold a potential to increase the predictability of expedited implant therapy. While implant outcomes have become highly predictable, there are sites and conditions that result in elevated implant loss. This paper reviews the impact of macro-retentive features which includes approaches to surface oxide modification, thread design, press-fit and sintered-bead technologies to increase predictability of outcomes. Implant designs that lead to controlled lateral compression of the bone can improve primary stability as long as the stress does not exceed the localized yield strength of the cortical bone. Some implant designs have reduced crestal bone loss by use of multiple cutting threads that are closely spaced, smoothed on the tip but designed to create a hoop-stress stability of the implant as it is completely seated in the osteotomy. Following the placement of the implant, there is a predictable sequence of bone turnover and replacement at the interface that allows the newly formed bone to adapt to microscopic roughness on the implant surface, and on some surfaces, a nanotopography (<10(-9) m scale) that has been shown to preferably influence the formation of bone. Newly emerging studies show that bone cells are exquisitely sensitive to these topographical features and will upregulate the expression of bone related genes for new bone formation when grown on these surfaces. We live in an exciting time of rapid changes in the modalities we can offer patients for tooth replacement therapy. Given this, it is our responsibility to be critical when claims are made, incorporate into our practice what is proven and worthwhile, and to continue to support and provide the best patient care possible.

  11. 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

  12. Scalloped Implant-Abutment Connection Compared to Conventional Flat Implant-Abutment Connection

    DEFF Research Database (Denmark)

    Starch-Jensen, Thomas; Christensen, Ann-Eva; Lorenzen, Henning

    2017-01-01

    OBJECTIVES: The objective was to test the hypothesis of no difference in implant treatment outcome after installation of implants with a scalloped implant-abutment connection compared to a flat implant-abutment connection. MATERIAL AND METHODS: A MEDLINE (PubMed), Embase and Cochrane library search...... of suprastructures has never been compared within the same study. High implant survival rate was reported in all the included studies. Significantly more peri-implant marginal bone loss, higher probing depth score, bleeding score and gingival score was observed around implants with a scalloped implant-abutment...... loss around implants with a scalloped implant-abutment connection. CONCLUSIONS: A scalloped implant-abutment connection seems to be associated with higher peri-implant marginal bone loss compared to a flat implant-abutment connection. Therefore, the hypothesis of the present systematic review must...

  13. 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

  14. 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

  15. Nitrogen implantation in steel with an impulsive ion implanter

    International Nuclear Information System (INIS)

    Feugeas, J.N.; Gonzalez, C.O.; Hermida, J.; Nieto, M.; Peyronel, M.F.; Sanchez, G.

    1990-01-01

    This work describes the results of steel implantation with nitrogen, with a pulsed accelerator which provides a continuous ion energy spectrum giving a uniform profile of nitrogen without changing its operative conditions. (Author)

  16. Ion implantation in semiconductor bodies

    International Nuclear Information System (INIS)

    Badawi, M.H.

    1984-01-01

    Ions are selectively implanted into layers of a semiconductor substrate of, for example, semi-insulating gallium arsenide via a photoresist implantation mask and a metallic layer of, for example, titanium disposed between the substrate surface and the photoresist mask. After implantation the mask and metallic layer are removed and the substrate heat treated for annealing purposes. The metallic layer acts as a buffer layer and prevents possible contamination of the substrate surface, by photoresist residues, at the annealing stage. Such contamination would adversely affect the electrical properties of the substrate surface, particularly gallium arsenide substrates. (author)

  17. Hardness of ion implanted ceramics

    International Nuclear Information System (INIS)

    Oliver, W.C.; McHargue, C.J.; Farlow, G.C.; White, C.W.

    1985-01-01

    It has been established that the wear behavior of ceramic materials can be modified through ion implantation. Studies have been done to characterize the effect of implantation on the structure and composition of ceramic surfaces. To understand how these changes affect the wear properties of the ceramic, other mechanical properties must be measured. To accomplish this, a commercially available ultra low load hardness tester has been used to characterize Al 2 O 3 with different implanted species and doses. The hardness of the base material is compared with the highly damaged crystalline state as well as the amorphous material

  18. 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.

  19. Cochlear implantation in a bilateral Mondini dysplasia.

    Science.gov (United States)

    Turrini, M; Orzan, E; Gabana, M; Genovese, E; Arslan, E; Fisch, U

    1997-01-01

    We report the speech perception progress and programming procedures of a case of congenital profound deafness and bilateral Mondini dysplasia implanted with a Nucleus 20 + 2 cochlear implant at the age of six. Unclear relations between electrodes array and cochlear partition made implant programming difficult and non-standard procedures were set. Cochlear implantation may give excellent rehabilitative results also in cochleae with malformation.

  20. Implant retention systems for implant-retained overdentures.

    Science.gov (United States)

    Laverty, D P; Green, D; Marrison, D; Addy, L; Thomas, M B M

    2017-03-10

    Implant retained overdentures are being increasingly utilised in both general and specialist practice to rehabilitate patients with missing teeth, particularly those that are edentate. This article aims to inform the reader of a variety of retention systems that are available to retain an implant overdenture and to understand how these systems work, their advantages and disadvantages and to outline some of the clinical and treatment planning considerations involved in selecting the most appropriate retention system for patients.

  1. Implant Materials Generate Different Peri-implant Inflammatory Factors

    OpenAIRE

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

    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 connectiv...

  2. La volatilidad del tipo de cambio paralelo en Venezuela 2005-2015

    Directory of Open Access Journals (Sweden)

    Laura Daniela Castillo Paredes

    2017-02-01

    Full Text Available El tipo de cambio paralelo constituye una de las principales variables económicas para la toma de decisiones en Venezuela. Para analizar el comportamiento de esta variable tomando en cuenta sus características inherentes, exceso de curtosis, persistencia y asimetría, se hace una síntesis teórica de los principales modelos estocásticos de volatilidad y, se estima un conjunto de modelos. El modelo que mejor ajusta el comportamiento de la variable es un EGARCH (1,1, que captura el efecto asimétrico de las perturbaciones estocásticas sobre la serie. Ante choques negativos (depreciación del tipo de cambio paralelo, la volatilidad asociada se incrementa, pero para choques positivos (apreciación del tipo de cambio paralelo, se mantiene constante.

  3. Structure of ion-implanted ceramics

    International Nuclear Information System (INIS)

    Naramoto, Hiroshi

    1983-01-01

    The variation of structure of LiF, MgO, Al 2 O 3 and TiO 2 accompanying annealing after ion implantation is explained. The analysis of structure is usually made by the perturbed gamma ray angular correlation, the internal electron Moessbauer method, or the ion scattering method. The results of analyses are discussed for alkali ion implantation, Fe-ion implantation, In-ion implantation, Au-ion implantation, Pt-ion implantation, Pb-ion implantation and transition metal ion implantation. The coupling of the implanted elements with lattice defects and matrix elements, and the compatibility between deposited elements and matrix crystal lattice were studied. The variation of physical properties due to ion implantation such as phase transition, volume change, the control of single crystal region, and the variation of hardness near surface were investigated, and the examples are presented. (Kato, T.)

  4. Biometria e armazenamento de sementes de genótipos de cacaueiro

    Directory of Open Access Journals (Sweden)

    Lucimara Ribeiro Venial

    2017-03-01

    Full Text Available Genótipos de Theobroma cacao L. devem ser melhor estudados, para se identificar aqueles que produzem sementes mais desenvolvidas e viáveis após o armazenamento. Objetivou-se com este trabalho estudar a biometria e dois tempos de armazenamento de sementes de genótipos de cacaueiro. A biometria foi avaliada em oito genótipos de cacaueiro (tratamentos. Foram instalados testes de germinação em delineamento inteiramente ao acaso, no esquema fatorial 8 x 2 (genótipos: CCN51, PH16, CEPEC2002, Ipiranga, SJ02, PS1319, TSH1188 e Comum x dois períodos de armazenamento: 0 e dois dias. O genótipo TSH1188 apresentou maior comprimento, relação comprimento/largura, espessura e massa de 100 sementes. A absorção de água das sementes recém-colhidas dos genótipos é lenta, justificada pelos altos teores de água, o que não caracteriza padrão-trifásico. Os teores de água reduziram em média 2,3 vezes nas sementes armazenadas em relação às recém-colhidas. A germinação das sementes recém-colhidas dos genótipos foi de 100%. Após o armazenamento, as sementes do PS1319 apresentaram a menor redução da germinação (39%, enquanto as dos PH16, CEPEC2002 e SJ02 reduziram 96%. A velocidade de germinação foi maior e o tempo médio menor que dois dias nas sementes recém-colhidas do PS1319, indicando serem mais tolerante à dessecação. Sugere-se o uso dos genótipos TSH1188 e PS1319 em programas de melhoramento genético.

  5. Ictiosis congénita tipo laminar, reporte de un caso.

    OpenAIRE

    Joaquín Saavedra D.; María José Sierralta S.; Cristian Saavedra D; Vanesa Rivera C; Francisco Cerda C.

    2014-01-01

    RESUMEN INTRODUCCIÓN: La ictiosis tipo laminar es una enfermedad dermatológica infrecuente perteneciente al grupo de las llamadas genodermatosis. Es una forma de ictiosis congénita que es evidente desde el nacimiento. PRESENTACIÓN DEL CASO: Recién nacido por cesárea, sexo masculino, de 36 semanas de gestación, adecuado para la edad gestacional y con APGAR 8. Antecedentes familiares: padres no consanguíneos y hermano con ictiosis tipo laminar. Luego de nacer es hospital...

  6. Espiritualidad e incertidumbre ante la enfermedad en personas con diabetes mellitus tipo 2

    OpenAIRE

    Gómez Palencia, Isabel Patricia

    2010-01-01

    Objetivo: Determinar la relación entre espiritualidad e incertidumbre presente en personas con situación crónica por diabetes mellitus tipo II. Metodología: abordaje cuantitativo de tipo correlacional de corte transversal, midiendo la espiritualidad con la escala de perspectiva espiritual de Reed, y la incertidumbre con la escala de Mishel. La muestra incluye 163 pacientes, distribuidos en la institución de la ESE Cartagena de Indias; y Fundación MEDICUS “Casa del diabético de Car...

  7. Espiritualidad e incertidumbre ante la enfermedad: adultos diabéticos tipo 2

    OpenAIRE

    Gómez Palencia, Isabel Patricia; Durán de Villalobos, María Mercedes

    2013-01-01

    El objetivo principal de este artículo es determinar la relación entre espiritualidad e incertidumbre presente en personas con situación crónica por diabetes mellitus tipo 2 en instituciones de servicio de salud en Cartagena, Colombia. El estudio fue realizado con un método descriptivo transversal, correlacional.Asimismo, la muestra fue de 163 pacientes que tuvieran como mínimo dos meses de haber sido diagnosticados con diabetes mellitus tipo 2; los instrumentos utilizados fueron la escala de...

  8. Atividade física na criança com diabetes tipo 1

    OpenAIRE

    Miculis,Cristiane P.; Mascarenhas,Luis P.; Boguszewski,Margaret C. S.; Campos,Wagner de

    2010-01-01

    OBJETIVO: Abordar os aspectos práticos da realização segura de atividade física e esportes em crianças e adolescentes portadores de diabetes tipo 1. FONTES DOS DADOS: A pesquisa dos artigos foi conduzida em fontes de dados nacionais (SciELO) e internacionais (PubMed/MEDLINE), assim como nas próprias referências dos artigos encontrados, adotando como limites: artigos publicados nos últimos 10 anos, preferencialmente conduzidos em crianças e adolescentes com diabetes tipo 1, sendo em sua maiori...

  9. Tipologias e Arquétipos: a Psicologia Profunda como base para uma hermenêutica

    OpenAIRE

    Jactania Marques Muller; Patricia de Sá Freire

    2015-01-01

    http://dx.doi.org/10.5007/1807-1384.2015v12n1p382FERNANDES, Ermelinda Ganem; FIALHO, Francisco Antônio Pereira. Tipologias e arquétipos: a Psicologia Profunda como base para uma hermenêutica - Coleção Jung sai pra rua. v. 1. Florianópolis: Insular, 2014. 264 p. FERNANDES, Ermelinda Ganem; FIALHO, Francisco Antônio Pereira. Tipologias e arquétipos: a Psicologia Profunda como base para uma hermenêutica - Coleção Jung sai pra rua. v. 1. Florianópolis: Insular, 2014. 264 p. FERNANDES, Ermel...

  10. Xantomas eruptivos asociados a diabetes mellitus tipo II e hipertrigliceridemia: reporte de un caso

    OpenAIRE

    Victoria Bárzaga, Héctor Oscar; Ramos Cabrera, Asmell; Lazo Sánchez, Laura

    2009-01-01

    Se reporta el caso de un hombre de raza blanca, 37 años de edad, hijo de madre con diabetes mellitus tipo 1, con antecedentes patológicos personales de padecer de obesidad exógena desde aproximadamente cinco años. Comenzó a presentar de forma diseminada una erupción papulosa de color amarillento, que se diagnosticó clínicamente e histológicamente como xantomas eruptivos asociados a diabetes mellitus tipo 2 de debut e hipertrigliceridemia. Se describen las generalidades de los xantomas eruptiv...

  11. A rede social e os tipos de apoio recebidos por idosos institucionalizados

    OpenAIRE

    Rodrigues,Adriana Guimarães; Silva,Ailton Amélio da

    2013-01-01

    Estudo descritivo que teve como objetivo identificar a composição da rede de apoio social de idosos institucionalizados, bem como os tipos e as quantidades de apoios recebidos por eles. O apoio social tem função importante no enfretamento das perdas e limitações da velhice. Participaram 30 idosos institucionalizados com média de idade de 74 anos. Foram aplicadas entrevistas e a escala de apoio social para identificar a composição da rede social e tipos de apoio social que os idosos recebiam. ...

  12. Consumo de frutos secos y aceites vegetales en personas con diabetes mellitus tipo 1

    OpenAIRE

    Ferrer-García, Juan Carlos; Granell Vidal, Lina; Muñoz Izquierdo, Amparo; Sánchez Juan, Carlos

    2015-01-01

    Introducción: estudios recientes han demostrado los beneficios cardiovasculares de la dieta mediterránea enriquecida con aceite de oliva y frutos secos. Las personas con diabetes, que tienen un mayor riesgo de complicaciones cardiovasculares, podrían beneficiarse en gran medida de seguir ese tipo de patrón alimentario. Objetivos: análisis de la ingesta de grasas vegetales procedentes de frutos secos y aceites vegetales en pacientes con diabetes mellitus tipo 1 (DM1). Métodos: estudio transver...

  13. Introducción a los Tipos Abstractos de Datos (TAD), febrero 2001

    OpenAIRE

    Minguillón Alfonso, Julià

    2001-01-01

    Los materiales docentes de Introducción a los Tipos Abstractos de Datos contienen: concepto de abstracción, abstracción funcional y abstracción de datos y construcción de tipos abstractos de datos (especificación de un TAD y implementación de un TA). Els materials docents d'Introducció als Tipus Abstractes de Dades contenen: concepte d'abstracció, abstracció funcional i abstracció de dades i construcció de tipus abstractes de dades (especificació d'un TAD i implementació d'un TA). UOC L...

  14. Surface microhardening by ion implantation

    International Nuclear Information System (INIS)

    Singh, Amarjit

    1986-01-01

    The paper discusses the process and the underlying mechanism of surface microhardening by implanting suitable energetic ions in materials like 4145 steel, 304 stainless steel, aluminium and its 2024-T351 alloy. It has been observed that boron and nitrogen implantation in materials like 4145 steel and 304 stainless steel can produce a significant increase in surface hardness. Moreover the increase can be further enhanced with suitable overlay coatings such as aluminium (Al), Titanium (Ti) and carbon (C). The surface hardening due to implantation is attributed to precipitation hardening or the formation of stable/metastable phase or both. The effect of lithium implantation in aluminium and its alloy on microhardness with increasing ion dose and ion beam energy is also discussed. (author)

  15. Implanted-tritium permeation experiments

    International Nuclear Information System (INIS)

    Longhurst, G.R.; Holland, D.F.; Casper, L.A.; Hsu, P.Y.; Miller, L.G.; Schmunk, R.E.; Watts, K.D.; Wilson, C.J.; Kershner, C.J.; Rogers, M.L.

    1982-04-01

    In fusion reactors, charge exchange neutral atoms of tritium coming from the plasma will be implanted into the first wall and other interior structures. EG and G Idaho is conducting two experiments to determine the magnitude of permeation into the coolant streams and the retention of tritium in those structures. One experiment uses an ion gun to implant deuterium. The ion gun will permit measurements to be made for a variety of implantation energies and fluxes. The second experiment utilizes a fission reactor to generate a tritium implantation flux by the 3 He(n,p) 3 H reaction. This experiment will simulate the fusion reactor radiation environment. We also plan to verify a supporting analytical code development program, in progress, by these experiments

  16. Dental-Implantate und ihre Werkstoffe

    Science.gov (United States)

    Newesely, Heinrich

    1983-07-01

    Some new trends in materials for dental implants, which also effect in the operative techniques and implant design, are described. Advantages and shortcomings of the different material types are exemplified and correlated with their bioinert resp. bioactive functions. The practical interest in metallic implants focussed in titanium resp. oxide ceramics in the ceramic field, whereas the special goal of implant research follows from the improvement of the bioactive principle with loaded calcium phosphate implants.

  17. Biodegradable Implants in Orthopaedics and Traumatology

    OpenAIRE

    YETKIN, Haluk

    2014-01-01

    Biodegradable implants are an alternative to metallic implants and have the advantage of not being necessary to remove once the fracture has healed. Twenty-two patients with fractures were treated with biodegradable implants. There were osteolysis in eleven patients; however, no serious complication was encountered. Although biodegradable implants are expensive, a second surgical procedure to remove the implants is not necessary, relieving the patient of the related costs and risks.

  18. Basics of clinical diagnosis in implant dentistry

    Directory of Open Access Journals (Sweden)

    Manu Rathee

    2015-01-01

    Full Text Available Implant-based prosthetic rehabilitation requires an understanding of associated anatomical structures. The ultimate predictability of an implant site is determined by the existing anatomy as related to dentition and the associated hard and soft tissues. Meticulous clinical assessment helps in determining the suitability of the potential site for implant placement. The purpose of this article is to present the clinical assessment for dental implants' placement to modulate peri-implant tissue characteristics in individual clinical need.

  19. Qualidade pós-colheita de melão tipo cantaloupe, colhido em dois estádios de maturação Postharvest quality of cantaloupe type melon, harvested in two maturation stages

    Directory of Open Access Journals (Sweden)

    Júlio Gomes Júnior

    2001-11-01

    Full Text Available Objetivou-se avaliar a conservação pós-colheita de frutos de melão tipo cantaloupe (Cucumis melo L var. Cantaloupensis , genótipo Nun 3984, colhido nos estádios de maturação II ( frutos imaturos em início de descoloração e pedúnculo totalmente preso e IV (frutos com pedúnculo totalmente rachado, em seis períodos de armazenamento: 0; 5; 10;15; 20 e 25 dias. Os frutos foram provenientes do Agropolo Mossoró-Assu (RN, cujo clima é caracterizado como quente e seco, com temperaturas máxima e mínima de 33ºC e 29ºC, respectivamente. O armazenamento foi realizado a 20ºC e 50% UR. Utilizou-se um fatorial 2 x 6 (dois estádios de maturação e seis períodos de armazenamento, em delineamento inteiramente casualizado, com três repetições, sendo utilizados dois frutos por parcela. Os frutos foram avaliados individualmente quanto à firmeza da polpa, perda de peso, teor de sólidos solúveis, aparências externa e interna. Houve efeito significativo da interação entre os fatores estudados apenas para variável firmeza da polpa. A firmeza da polpa foi de 30,07 N e 18,75 N por ocasião da colheita e 5,32 N e 3,50 N aos 25 dias de armazenamento, respectivamente, para os estádios II e IV de maturação. O teor de sólidos solúveis apresentado por esse genótipo (7% a 9%, nos estádios II e IV de maturação respectivamente, não estabelece um padrão mínimo para a aceitação no mercado externo. A perda de peso atingiu valores médios de 6,26% e 6,67% aos 20 e 25 dias de armazenamento, respectivamente. Os frutos chegaram aos 20 dias de armazenamento com nota média 3,1 (deterioração mediana e 4,0 (deterioração leve para as aparências interna e externa, respectivamente, nos dois estádios de maturação, sendo portanto, considerados próprios para o consumo, por terem notas acima de 3,0This work aimed to evaluate the postharvest shelf life of cantaloupe melons type (Cucumis melo L. var Cantaloupensis, genotype Nun 3984, harvested

  20. Estudio del fenotipo de haptoglobinas en pacientes con diabetes mellitus tipo 1, en Lima, Perú

    OpenAIRE

    Arias, Clever; Inga, Miriam; Oré, Raquel; Zapata, Luis; Aquije, Carmen

    2013-01-01

    Objetivos: Determinar el fenotipo de haptoglobina -1/1, 1/2 y 2/2- predominante en una muestra de 36 pacientes con diabetes mellitus tipo I (DM tipo I). Diseño: Observacional con sistema de medición, descriptivo. Institución: Centro de Investigación de Bioquímica y Nutrición, Facultad de Medicina, UNMSM. Participantes: Pacientes con diagnóstico de diabetes mellitus tipo I Intervenciones: En 36 pacientes con diagnóstico de diabetes mellitus tipo I, se realizó medidas antropométricas, evaluacio...

  1. Estimulación de diferentes tipos de inteligencias a través de los videojuegos

    OpenAIRE

    Aliciardi, Agustina; De Cunto, Guillermo; Marcucci, Ricardo Martín

    2016-01-01

    Existen diferentes tipos de inteligencia (lógico-matemática, verbal-lingüística, corporal-cinestésica, musical, naturalista, visual-espacial, interpersonal, intrapersonal). Conocer las habilidades y capacidades típicas de cada tipo de inteligencia permite saber que tipo de actividades realizar para estimularlas y lograr generar un desarrollo más equilibrado, que le permita a las personas maximizar su potencial aprovechando sus fortalezas. Debido a esto, se investigaron diferentes tipos de jue...

  2. Body Implanted Medical Device Communications

    Science.gov (United States)

    Yazdandoost, Kamya Yekeh; Kohno, Ryuji

    The medical care day by day and more and more is associated with and reliant upon concepts and advances of electronics and electromagnetics. Numerous medical devices are implanted in the body for medical use. Tissue implanted devices are of great interest for wireless medical applications due to the promising of different clinical usage to promote a patient independence. It can be used in hospitals, health care facilities and home to transmit patient measurement data, such as pulse and respiration rates to a nearby receiver, permitting greater patient mobility and increased comfort. As this service permits remote monitoring of several patients simultaneously it could also potentially decrease health care costs. Advancement in radio frequency communications and miniaturization of bioelectronics are supporting medical implant applications. A central component of wireless implanted device is an antenna and there are several issues to consider when designing an in-body antenna, including power consumption, size, frequency, biocompatibility and the unique RF transmission challenges posed by the human body. The radiation characteristics of such devices are important in terms of both safety and performance. The implanted antenna and human body as a medium for wireless communication are discussed over Medical Implant Communications Service (MICS) band in the frequency range of 402-405MHz.

  3. 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.

  4. Implantation damage in silicon devices

    International Nuclear Information System (INIS)

    Nicholas, K.H.

    1977-01-01

    Ion implantation, is an attractive technique for producing doped layers in silicon devices but the implantation process involves disruption of the lattice and defects are formed, which can degrade device properties. Methods of minimizing such damage are discussed and direct comparisons made between implantation and diffusion techniques in terms of defects in the final devices and the electrical performance of the devices. Defects are produced in the silicon lattice during implantation but they are annealed to form secondary defects even at room temperature. The annealing can be at a low temperature ( 0 C) when migration of defects in silicon in generally small, or at high temperature when they can grow well beyond the implanted region. The defect structures can be complicated by impurity atoms knocked into the silicon from surface layers by the implantation. Defects can also be produced within layers on top of the silicon and these can be very important in device fabrication. In addition to affecting the electrical properties of the final device, defects produced during fabrication may influence the chemical properties of the materials. The use of these properties to improve devices are discussed as well as the degradation they can cause. (author)

  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. 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.

  7. 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.

  8. 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.

  9. 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.

  10. Implantate in der Augenheilkunde

    Science.gov (United States)

    Dresp, Joachim H.

    Im Bereich der Augenheilkunde findet sich die weltweit am häufigsten ausgeführte chirurgische Massnahme, die operative Behandlung des Grauen Stars: die Katarakt. Bei der Katarakt handelt es sich um eine Eintrübung der natürlichen Augenlinse, die sich je nach Stadium der Erkrankung leicht opak, über milchig bis zu bräunlich präsentiert. Mit dieser Zunahme der Undurchlässigkeit für das sichtbare Licht geht eine Abnahme des Sehvermögens einher, die bis zur totalen Erblindung führen kann. Bedingt durch die sehr eingeschränkten chirurgischen Möglichkeiten in den Ländern der Dritten Welt ist die Katarakt die Erblindungsursache Nummer 1 in der Welt. Ganz im Gegensatz hierzu ist in den industrialisierten Ländern Europas, Amerikas und Asiens die Katarakt-OP die sicherste chirurgische Intervention. In der Augenheilkunde werden Implantate aller drei Aggregatszustände verwendet.

  11. Factores de riesgo de diabetes mellitus tipo 2 en mujeres postmenopaúsicas

    OpenAIRE

    Acosta Naranjo, William Daniel; Esnal, Virginia

    2012-01-01

    La Diabetes Mellitus tipo 2 (DM 2) es una enfermedad con impacto socio sanitario por su elevada frecuencia y mortalidad cardiovascular. En Uruguay, como en la población mundial, la DM2 es más frecuente en mujeres. Este trabajo describe factores de riesgo en mujeres postmenopaúsicas que nosotros, los investigadores de este manuscrito, atendemos.

  12. Representaciones mentales sobre los tipos de agresión en escolares

    Directory of Open Access Journals (Sweden)

    Yuly Fang Alandette

    2009-01-01

    Full Text Available Este artículo presenta un estudio descriptivo comparativo de corte transversal acerca de las representaciones mentales de los tipos de agresión en una muestra de 60 niños escolarizados, de 8 a 11 años de edad. Los niños provienen de los niveles socio-económicos alto y bajo de la ciudad de Cartagena. Para recolectar la información, se utilizó la técnica de entrevista clínica piagetiana de tipo semi-estructurada, apoyada con dibujos que permitieron explorar las ideas y sentimientos de los niños y las niñas. Las explicaciones de los niños son más claras y estructuradas respecto a las agresiones directas de tipo físico y verbal, adiferencia de las representaciones de agresiones, tales como la amenaza y exclusión que se muestran menos elaboradas. Aunque se observan diferencias de acuerdo con la edad al identificar los tipos de agresión y las categorías evaluadas, las explicaciones difieren en muchos casos de los resultados de otras investigaciones.

  13. Uso de neumocitos de tipo II en el tratamiento de enfermedades pulmonares asociadas con fibrosis pulmonar

    OpenAIRE

    Serrano-Mollar, Anna; Closa, Daniel; Bulbena, Oriol

    2005-01-01

    Se describe el empleo de neumocitos tipo II como agentes inhibidores de la proliferación de fibroblastos, por lo que pueden ser utilizados en la elaboración de un medicamento para el tratamientode enfermedades pulmonares que cursan con fibrosis pulmonar.

  14. Medicamentos para la Diabetes Tipo 2. Lo Nuevo y Lo Tradicional.

    Directory of Open Access Journals (Sweden)

    Alfredo Jácome Roca

    2008-06-01

    Uno de los más importantes estudios fue el UKPDS, básico para el manejo integral del diabético tipo 2. Las implicaciones más importantes de este estudio tuvieron que ver con las complicaciones micro y macrovasculares.

  15. Influencia del contacto precoz, nacionalidad, tipo de parto y prematuridad en la lactancia materna

    Directory of Open Access Journals (Sweden)

    Ana Belén Laviña Castan

    2015-01-01

    Full Text Available Conocer si en el HUMS existe asociación entre lactancia materna y nacionalidad, prematuridad, tipo de parto, contacto precoz piel con piel. Estudio de cohortes, en una muestra de 541 puérperas del HUMS en octubre-noviembre 2011. Las variables: nacionalidad, tipo de parto, contacto precoz, parto prematuro e inicio lactancia materna se recogieron antes del alta hospitalaria mediante cuestionario. A los dos meses postparto se contactó telefónicamente con las madres para conocer el tipo de lactancia en ese momento. El 70,32 % iniciaron la lactancia materna en las dos primeras horas postparto y el 55,58% daban Lactancia materna exclusiva (LME a los dos meses. Influyen en la lactancia materna el tipo de parto, contacto precoz y parto prematuro. La probabilidad de lactancia materna es 3,65 veces más alta si se ha realizado contacto precoz (RR 3,65; IC 95% 2,72-4,88; p=0,001. El inicio de lactancia materna en las 2 primeras horas y la nacionalidad española influye positivamente en la LME a los 2 meses. Las prácticas hospitalarias en el postparto deben promover el contacto precoz madre-recién nacido y el inicio de lactancia materna en las dos primeras horas, principalmente en las cesáreas.

  16. Quebrando estereótipos e rompendo preconceitos na sala de aula

    Directory of Open Access Journals (Sweden)

    Daniela Jakubaszko

    2015-04-01

    Full Text Available Este texto se preocupa em contribuir para a reflexão que torna possível a identificação e ruptura dos estereótipos sociais que dão origem a preconceitos e ações discriminatórias. Com base nos estudos de Walter Lippann, Agnes Heller, Adam Shaff e Eclea Bosi, pretende-se discutir os conceitos de estereótipo e preconceito, buscando entender o que são e porque se formam. Para entender melhor o estereótipo temos que refletir sobre três elementos que a ele se ligam: a linguagem, o cotidiano e o senso comum. É no plano da linguagem - do diálogo e das práticas de linguagem - que se deve estudar e se pode romper e desconstruir os estereótipos, tomando consciência da própria formação discursiva. O texto oferece, ainda, algumas sugestões para trabalhar o conceito na sala de aula e para ampliar o repertório de textos e referências a serem debatidas com os alunos.

  17. Precision of fit between implant impression coping and implant replica pairs for three implant systems.

    Science.gov (United States)

    Nicoll, Roxanna J; Sun, Albert; Haney, Stephan; Turkyilmaz, Ilser

    2013-01-01

    The fabrication of an accurately fitting implant-supported fixed prosthesis requires multiple steps, the first of which is assembling the impression coping on the implant. An imprecise fit of the impression coping on the implant will cause errors that will be magnified in subsequent steps of prosthesis fabrication. The purpose of this study was to characterize the 3-dimensional (3D) precision of fit between impression coping and implant replica pairs for 3 implant systems. The selected implant systems represent the 3 main joint types used in implant dentistry: external hexagonal, internal trilobe, and internal conical. Ten impression copings and 10 implant replicas from each of the 3 systems, B (Brånemark System), R (NobelReplace Select), and A (NobelActive) were paired. A standardized aluminum test body was luted to each impression coping, and the corresponding implant replica was embedded in a stone base. A coordinate measuring machine was used to quantify the maximum range of displacement in a vertical direction as a function of the tightening force applied to the guide pin. Maximum angular displacement in a horizontal plane was measured as a function of manual clockwise or counterclockwise rotation. Vertical and rotational positioning was analyzed by using 1-way analysis of variance (ANOVA). The Fisher protected least significant difference (PLSD) multiple comparisons test of the means was applied when the F-test in the ANOVA was significant (α=.05). The mean and standard deviation for change in the vertical positioning of impression copings was 4.3 ±2.1 μm for implant system B, 2.8 ±4.2 μm for implant system R, and 20.6 ±8.8 μm for implant system A. The mean and standard deviation for rotational positioning was 3.21 ±0.98 degrees for system B, 2.58 ±1.03 degrees for system R, and 5.30 ±0.79 degrees for system A. The P-value for vertical positioning between groups A and B and between groups A and R was <.001. No significant differences were found for

  18. Mini-implantes ortodônticos como auxiliares da fase de retração anterior Orthodontic mini-implants assisting the anterior retraction phase

    Directory of Open Access Journals (Sweden)

    Carlo Marassi

    2008-10-01

    Full Text Available INTRODUÇÃO: os mini-implantes ortodônticos se estabeleceram como um importante método de ancoragem e vêm auxiliando os ortodontistas nas várias etapas do tratamento ortodôntico, eliminando, em grande parte, a necessidade de colaboração dos pacientes e tornando os resultados mais previsíveis. OBJETIVO: este artigo descreve os principais aspectos do uso dos mini-implantes como auxiliares da fase de retração anterior, trazendo considerações sobre suas indicações, quantidade de movimentação dos dentes anteriores, os vetores de força de retração, o controle vertical, o posicionamento dos mini-implantes, os tipos de apoio na região anterior e a força a ser utilizada. São citados os sítios de instalação mais usados para a retração anterior e abordados fatores que deverão ser controlados durante o fechamento de espaço. Por fim, são citadas algumas considerações clínicas sobre o uso dos mini-implantes nessa importante fase do tratamento ortodôntico.INTRODUCTION: The use of orthodontic mini-implants has settled as an important anchorage method and is aiding the orthodontists in the several stages of the treatment, largely eliminating the need of patients' compliance, and turning the results more predictable. AIM: This article describes the main aspects of the use of mini-implants as auxiliaries on the retraction phase of the anterior teeth, bringing considerations about their indications, amount of movement of the anterior teeth, the vectors of retraction force, the vertical control and evaluation of the incisors vestibulolingual tipping, the positioning of the mini-implants, the support types in the anterior area and the force to be applied. The placement sites best used for the anterior retraction are mentioned, and the factors that should be controlled during the space closure are approached. Lastly, some clinical considerations on the use of mini-implants in such important phase of the orthodontic treatment are

  19. Frecuencia y tipos de toxinas superantígenos en Staphylococcus aureus de diferentes orígenes: relaciones con tipos genéticos

    OpenAIRE

    Fueyo Mendoza, José María

    2005-01-01

    Staphylococcus aureus de diferentes orígenes (muestras nasales de portadores humanos, alimentos manipulados, y leche de vacas con mastitis subclínica), recogidos en Asturias (1996-2002), han sido analizados mediante técnicas convencionales y moleculares para determinar la frecuencia y los tipos de genes de toxinas pirogénicas superantígenos (PTSAg) que portan y el polimorfismo de su ADN con objeto de establecer relaciones toxigénicas y genómicas entre aislamientos. La interrelación de los res...

  20. Carga inmediata en implantes dentales Immediate loading of dental implants

    Directory of Open Access Journals (Sweden)

    C. Concejo Cútoli

    2005-10-01

    Full Text Available El protocolo de carga convencional en una o dos fases quirúrgicas ha sido evaluado durante los últimos 30 años bajo todas las condiciones clínicas posibles. En comparación, la carga inmediata es un protocolo relativamente nuevo que necesita de una estricta evaluación clínica. Realizamos una búsqueda bibliográfica sobre los ensayos clínicos publicados de carga inmediata en función de las diferentes opciones terapéuticas que se pueden plantear. Se hallaron resultados comparables para las dos estrategias de carga en mandíbulas edéntulas. Para el tratamiento con prótesis inmediata de maxilares totalmente edéntulos, restauraciones parciales e unitarias es todavía necesaria una selección adecuada de pacientes y un diseño conservador de la prótesis provisional. La necesidad de ensayos clínicos sencillos aleatorizados de doble ciego, con suficiente número de pacientes y adecuado seguimiento, que comparen una determinada situación clínica con un patrón oclusal de la prótesis provisional bien definido, son imprescindibles para acabar de confirmar la seguridad de la técnica.The protocol for conventional loading in one or two surgical stages has been evaluated over the last 30 years under all the possible clinical conditions. By comparison, immediate loading is a relatively new protocol that requires strict clinical evaluation. We conducted a search of the literature published concerning clinical trials on immediate loading according to the different therapeutic options that could be considered. Comparable results were found for both loading strategies in edentulous mandibles. For treatment involving an immediate prosthesis for totally edentulous mandibles, partial and single tooth restorations, patients have to be selected adequately and provisional prostheses have to be designed conservatively. In order to completely confirm the safety of the technique, double-blind, simple, randomized clinical trials have to be carried out with

  1. 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

  2. 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.

  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. Occlusal considerations for dental implant restorations.

    Science.gov (United States)

    Bergmann, Ranier H

    2014-01-01

    When placed, dental implants are put into an ever-changing oral environment in which teeth can continue to migrate. Yet, the implants themselves are ankylosed. This can lead to occlusal instability. Teeth may continue to erupt, leaving the implants in infraocclusion. Teeth may move mesially away from an implant, requiring modification to close an open contact point. Friction in the connection between teeth and implants can lead to intrusion of teeth and damage to the periodontal attachment apparatus. Implant occlusion with shallow incisal guidance minimizes lateral and tipping forces. Cross-arch stabilization allows the best distribution of occlusal forces. The choice of restorative materials influences long-term occlusal stability.

  5. Sutura de menisco com implantes absorvíveis Meniscus suture with absorbable implants

    Directory of Open Access Journals (Sweden)

    Arnaldo José Hernandez

    2006-01-01

    Full Text Available Os autores avaliam clinicamente 19 pacientes (19 joelhos - 15 meniscos mediais e 5 laterais submetidos à sutura de menisco, utilizando 2 tipos de implantes absorvíveis (ácido polilático Arrow® e Clear fix®. O estudo compõe-se de 15 homens e 4 mulheres com idades entre 16 e 44 anos, com média de 26,8 anos. O tempo de seguimento médio foi de 24 meses, com mínimo de 18 e máximo de 32 meses. A técnica operatória constituiu-se da sutura de um ou ambos os meniscos (1 caso, via artroscópica com Arrow® em 15 pacientes e Clear fix® em 4. Dos 19 indivíduos, 6 foram submetidos à sutura meniscal isolada, 11 associada à reconstrução do LCA e 2 à reconstrução do LCA com osteotomia valgizante da tíbia. Os resultados foram avaliados segundo exame físico incluindo as manobras de Appley e Mc Murray. A avaliação funcional pré e pós-operatória do joelho foi realizada pela escala de Lysholm modificada. Todos os pacientes tiveram suas manobras meniscais negativadas no pós-operatório. A pontuação média pré-operatória segundo a escala de Lysholm foi de 39,8 subindo para 91,5 no pós-operatório. Os autores concluem que a sutura de menisco, utilizando implantes absorvíveis, tem se mostrado eficiente até o momento, e que tecnicamente ela é mais simples que a sutura convencional.The authors clinically assessed 19 patients (19 knees - 15 medial meniscus and 5 lateral meniscus submitted to meniscus suture using 2 kinds of absorbable implants (polylactic acid Arrow® and Clear fix®. The study is composed of 15 males and 4 females, ages ranging 16 - 44 years old (average = 26.8 years old. The mean follow-up time was 24 months, ranging from 18 to 32 months, at most. The surgical technique was constituted of a suture in one or both meniscus (1 case, through arthroscopy with Arrow® in 15 patients and Clear fix® in 4. From the 19 individuals, 6 were submitted to isolated meniscal suture, 11 combined to ACL reconstruction and 2 to ACL

  6. Current trends in ion implantation

    International Nuclear Information System (INIS)

    Gwilliam, R.M.

    2001-01-01

    As semiconductor device dimensions continue to shrink, the drive beyond 250 nm is creating significant problems for the device processor. In particular, trends toward shallower-junctions, lower thermal budgets and simplified processing steps present severe challenges to ion implantation. In parallel with greater control of the implant process goes the need for a better understanding of the physical processes involved during implantation and subsequent activation annealing. For instance, the need for an understanding of dopant-defect interaction is paramount as defects mediate a number of technologically important phenomena such as transient enhanced diffusion and impurity gettering. This paper will outline the current trends in the ion implantation and some of the challenges it faces in the next decade, as described in the semiconductor roadmap. It will highlight some recent positron annihilation work that has made a contribution to addressing one of these challenges, namely the need for tighter control of implant uniformity and dose. Additionally, some vacancy-mediated processes are described with the implication that these may provide areas in which positron annihilation spectroscopy could make a significant contribution. (orig.)

  7. 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.

  8. 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.

  9. Aqueous shunt implantation in glaucoma

    Directory of Open Access Journals (Sweden)

    Jing Wang

    2017-01-01

    Full Text Available Aqueous shunts or glaucoma drainage devices are increasingly utilized in the management of refractory glaucoma. The general design of the most commonly-used shunts is based on the principles of the Molteno implant: ie. a permanent sclerostomy (tube, a predetermined bleb area (plate and diversion of aqueous humour to the equatorial region and away from the limbal subconjunctival space. These three factors make aqueous shunts more resistant to scarring as compared to trabeculectomy. The two most commonly used shunts are the Ahmed Glaucoma Valve, which contains a flow-restrictor, and the non-valved Baervedlt Glaucoma Implant. While the valved implants have a lower tendency to hypotony and related complications, the non-valved implants with larger, more-biocompatible end plate design, achieve lower intraocular pressures with less encapsulation. Non-valved implants require additional suturing techniques to prevent early hypotony and a number of these methods will be described. Although serious shunt-related infection is rare, corneal decompensation and diplopia are small but significant risks.

  10. 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.

  11. A new system of implant abutment connection: how to improve a two piece implant system sealing.

    Science.gov (United States)

    Grecchi, F; DI Girolamo, M; Cura, F; Candotto, V; Carinci, F

    2017-01-01

    Implant dentistry has become one of the most successful dentistry techniques for replacing missing teeth. The success rate of implant dentistry is above 80%. However, peri-implantitis is a later complication of implant dentistry that if untreated, can lead to implant loss. One of the hypotized causes of peri-implantis is the bacterial leakage at the level of implant-abutment connection. Bacterial leakage is favored to the presence of a micro gap at the implant-abutment interface, allowing microorganisms to penetrate and colonize the inner part of the implant leading to biofilm accumulation and consequently to peri-implantitis development. To identify the capability of the implant to protect the internal space from the external environment, the passage of genetically modified Escherichia coli across implant-abutment interface was evaluated. Implants were immerged in a bacterial culture for twenty-four hours and then bacteria amount was measured inside implant-abutment interface with Real-time PCR. Bacteria were detected inside all studied implants, with a median percentage of 9%. The reported results are better to those of previous studies carried out on different implant systems. Until now, none implant-abutment system has been proven to seal the gap between implant and abutment.

  12. Cortical Plasticity after Cochlear Implantation

    DEFF Research Database (Denmark)

    Petersen, Bjørn; Gjedde, Albert; Wallentin, Mikkel

    2013-01-01

    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...

  13. Tinting of intraocular lens implants

    Energy Technology Data Exchange (ETDEWEB)

    Zigman, S.

    1982-06-01

    Intraocular lens (IOL) implants of polymethyl methacrylate (PMMA) lack an important yellow pigment useful as a filter in the visual process and in the protection of the retina from short-wavelength radiant energy. The ability to produce a yellow pigment in the PMMA used in IOL implants by exposure to near-ultraviolet (UV) light was tested. It was found that the highly cross-linked material in Copeland lens blanks was tinted slightly because of this exposure. The absorptive properties of lens blanks treated with near-UV light in this way approached that of the absorptive properties of human lenses. This finding shows that it is possible to alter IOL implants simply so as to induce a pale-yellow pigment in them to improve the visual process and to protect the retinas of IOL users.

  14. MRI of orbital hydroxyapatite implants

    International Nuclear Information System (INIS)

    Flanders, A.E.; De Potter P.; Rao, V.M.; Tom, B.M.; Shields, C.L.; Shields, J.A.

    1996-01-01

    Our aim was to use MRI for the postsurgical assessment of a new form of integrated orbital implant composed of a porous calcium phosphate hydroxyapatite substrate. We studied ten patients 24-74 years of age who underwent enucleation and implantation of a hydroxyapatite ball; 5-13 months after surgery, each patient was examined by spin-echo MRI, with fat suppression and gadolinium enhancement. Fibrovascular ingrowth was demonstrated in all ten patients as areas of enhancement at the periphery of the hydroxyapatite sphere that extended to the center to a variable degree. The radiologist should aware of the MRI appearances of the coralline hydroxyapatite orbital implant since it is now widely used following enucleation. MRI is a useful means to determine successful incorporation of the substrate into the orbital tissues. The normal pattern of contrast enhancement should not be mistaken for recurrent tumor or infection. (orig.)

  15. Tinting of intraocular lens implants

    International Nuclear Information System (INIS)

    Zigman, S.

    1982-01-01

    Intraocular lens (IOL) implants of polymethyl methacrylate (PMMA) lack an important yellow pigment useful as a filter in the visual process and in the protection of the retina from short-wavelength radiant energy. The ability to produce a yellow pigment in the PMMA used in IOL implants by exposure to near-ultraviolet (UV) light was tested. It was found that the highly cross-linked material in Copeland lens blanks was tinted slightly because of this exposure. The absorptive properties of lens blanks treated with near-UV light in this way approached that of the absorptive properties of human lenses. This finding shows that it is possible to alter IOL implants simply so as to induce a pale-yellow pigment in them to improve the visual process and to protect the retinas of IOL users

  16. Implant rehabilitation in bruxism patient

    Science.gov (United States)

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

    2014-01-01

    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 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. PMID:24907215

  17. MR imaging of breast implants.

    Science.gov (United States)

    Gorczyca, D P

    1994-11-01

    MR imaging has proved to be an excellent imaging modality in locating free silicone and evaluating an implant for rupture, with a sensitivity of approximately 94% and specificity of 97%. Silicone has a unique MR resonance frequency and long T1 and T2 relaxation times, which allows several MR sequences to provide excellent diagnostic images. The most commonly used sequences include T2-weighted, STIR, and chemical shift imaging (Figs. 3, 13, and 14). The T2-weighted and STIR sequences are often used in conjunction with chemical water suppression. The most reliable findings on MR images for detection of implant rupture include identification of the collapsed implant shell (linguine sign) and free silicone within the breast parenchyma.

  18. 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

  19. Surface engineering by ion implantation

    International Nuclear Information System (INIS)

    Nielsen, Bjarne Roger

    1995-01-01

    Awidespread commercial applica tion iof particle accelerators is for ion implantation. Accelerator beams are used for ion implantation into metals, alloying a thin surface layer with foreign atoms to concentrations impossible to achieve by thermal processes, making for dramatic improvements in hardness and in resistance to wear and corrosion. Traditional hardening processes require high temperatures causing deformation; ion implantation on the other hand is a ''cold process'', treating the finished product. The ionimplanted layer is integrated in the substrate, avoiding the risk of cracking and delamination from normal coating processes. Surface properties may be ''engineered'' independently of those of the bulk material; the process does not use environmentally hazardous materials such as chromium in the surface coating. The typical implantation dose required for the optimum surface properties of metals is around 2 x 10 17 ion/cm 2 , a hundred times the typical doses for semiconductor processing. When surface areas of more than a few square centimetres have to be treated, the implanter must therefore be able to produce high beam currents (5 to 10 mA) to obtain an acceptable treatment time. Ion species used include nitrogen, boron, carbon, titanium, chromium and tantalum, and beam energies range from 50 to 200 keV. Since most components are three dimensional, it must be possible to rotate and tilt them in the beam, and control beam position over a large area. Examples of industrial applications are: - surface treatment of prostheses (hip and knee joints) to reduce wear of the moving parts, using biocompatible materials; - ion implantation into high speed ball bearings to protect against the aqueous corrosion in jet engines (important for service helicopters on oil rigs); - hardening of metal forming and cutting tools; - reduction of corrosive wear of plastic moulding tools, which are expensive to produce

  20. Carbon Fiber Biocompatibility for Implants

    Directory of Open Access Journals (Sweden)

    Richard Petersen

    2016-01-01

    Full Text Available 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 < 10−8 and 0.8 mm at 41.6% vs. 19.5% (p < 10−4, respectively. The review focuses on 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.

  1. 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.

  2. 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.

  3. Production of amorphous alloys by ion implantation

    International Nuclear Information System (INIS)

    Grant, W.A.; Chadderton, L.T.; Johnson, E.

    1978-01-01

    Recent data are reported on the use of ion implantation to produce amorphous metallic alloys. In particular data on the dose dependence of the crystalline to amorphous transition induced by P + implantation of nickel is presented. (Auth.)

  4. Dental implant surgery: planning and guidance

    International Nuclear Information System (INIS)

    Lobregt, S.; Schillings, J.J.; Vuurberg, E.

    2001-01-01

    A prototype application has been developed for interactive planning of dental implants on the EasyVision workstation. The user is led step by step via virtual positioning of the implant to the design of a customized drill guide. (orig.)

  5. Preparation of targets by ion implantation

    International Nuclear Information System (INIS)

    Santry, D.C.

    1976-01-01

    Various factors are described which are involved in target preparation by direct ion implantation and the limitations and pitfalls of the method are emphasized. Examples are given of experiments for which ion implanted targets are well suited. (author)

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

    African Journals Online (AJOL)

    prosthodontics; however, designing an implant‑supported prosthesis with function .... template where a provisional fixed restoration bridges the implant site. Pesun and ... in single implant therapy or short‑span implant‑supported prostheses.

  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. Implant surface preparation in the surgical treatment of experimental peri-implantitis with autogenous bone graft and ePTFE membrane in cynomolgus monkeys

    DEFF Research Database (Denmark)

    Schou, Søren; Holmstrup, Palle; Jørgensen, Torben

    2003-01-01

    peri-implantitis; treatment; implant surface preparation; nonhuman primates; histology; stereology......peri-implantitis; treatment; implant surface preparation; nonhuman primates; histology; stereology...

  9. 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)

  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. 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. Even though this technique has been used for many years, there are still several controversial issues to 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, and recent problems with Poly Implant Prothese implants are described and discussed.

  12. 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.

  13. Plasma immersion ion implantation into insulating materials

    International Nuclear Information System (INIS)

    Tian Xiubo; Yang Shiqin

    2006-01-01

    Plasma immersion ion implantation (PIII) is an effective surface modification tool. During PIII processes, the objects to be treated are immersed in plasmas and then biased to negative potential. Consequently the plasma sheath forms and ion implantation may be performed. The pre-requirement of plasma implantation is that the object is conductive. So it seems difficult to treat the insulating materials. The paper focuses on the possibilities of plasma implantation into insulting materials and presents some examples. (authors)

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

    OpenAIRE

    Chin-Yun Pan; Szu-Ting Chou; Yu-Chuan Tseng; Yi-Hsin Yang; Chao-Yi Wu; Ting-Hsun Lan; Pao-Hsin Liu; Hong-Po Chang

    2012-01-01

    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 w...

  15. Scalloped Implant-Abutment Connection Compared to Conventional Flat Implant-Abutment Connection

    DEFF Research Database (Denmark)

    Starch-Jensen, Thomas; Christensen, Ann-Eva; Lorenzen, Henning

    2017-01-01

    OBJECTIVES: The objective was to test the hypothesis of no difference in implant treatment outcome after installation of implants with a scalloped implant-abutment connection compared to a flat implant-abutment connection. MATERIAL AND METHODS: A MEDLINE (PubMed), Embase and Cochrane library search......-abutment connection. There were no significant differences between the two treatment modalities regarding professional or patient-reported outcome measures. Meta-analysis disclosed a mean difference of peri-implant marginal bone loss of 1.56 mm (confidence interval: 0.87 to 2.25), indicating significant more bone...... loss around implants with a scalloped implant-abutment connection. CONCLUSIONS: A scalloped implant-abutment connection seems to be associated with higher peri-implant marginal bone loss compared to a flat implant-abutment connection. Therefore, the hypothesis of the present systematic review must...

  16. CARACTERIZACIÓN DE LUMINARIAS TIPO HALURO METÁLICO ANTE EVENTOS SAG

    Directory of Open Access Journals (Sweden)

    Bonie Johana Restrepo Cuestas

    Full Text Available Este artículo plantea una metodología para la caracterización de luminarias de haluro metálico, ante eventos sag. Inicialmente, se diseñó y construyó un generador de eventos sag. Luego, se planteó un esquema de pruebas, que fue utilizado para analizar el comportamiento de un tipo de luminarias de alta densidad de descarga tipo Metal Halide, ante eventos sag. Finalmente, tomando como referente el estándar SEMI F-47, se realizó la construcción de una curva característica que muestra la región de operación de la luminaria.

  17. Metodología y clasificación de tipos de paisaje en Galicia

    Directory of Open Access Journals (Sweden)

    Augusto Pérez-Alberti

    2014-12-01

    Full Text Available En el presente artículo se exponen los resultados de las investigaciones llevadas a cabo con el fin de caracterizar los diferentes tipos de paisaje existentes en Galicia (Noroeste de España. Se ha considerado el paisaje como resultado de un sistema dinámico en que interaccionan elementos estructurales y texturales. El resultado ha sido la caracterización de 6 grupos de paisaje, en función del dominio de la dinámica natural o antrópica y 28 tipos de paisaje sobre los que incidir de forma directa de cara a su protección, gestión y ordenación.

  18. LINFOMA CUTÁNEO PRIMARIO DE CÉLULAS B, DEL TIPO DE LA PIERNA

    OpenAIRE

    BONILLA JARAMILLO, LINA MARÍA; CALDERÓN, JORGE ENRIQUE; JUAN GUILLERMO, CHALELA; GONZÁLEZ, MARÍA ISABEL

    2012-01-01

    El linfoma de células B del tipo de la pierna, es una neoplasia rara y agresiva, con características clínicas, morfológicas e inmunofenotípicas distintivas. Está clasificada dentro del grupo de linfomas cutáneos primarios de células B y se presenta en edades avanzadas, con predominio en mujeres y altas tasas de recurrencia. Presentamos el caso de una mujer de 63 años de edad, con diagnóstico clínico e inmunofenotípico de linfoma cutáneo de células B del tipo de la pierna. Primary cutaneous...

  19. Histological study on acute inflammatory reaction to polyurethane-coated silicone implants in rats Estudo histológico da reação inflamatória aguda ao implante de silicone revestido com poliuretano em ratos

    Directory of Open Access Journals (Sweden)

    Paulo Roberto da Silva Mendes

    2008-02-01

    ção antimicrobiana, VI- contaminação idêntica do grupo III e imersão dos implantes em solução antimicrobiana, VII- contaminação idêntica do grupo IV e imersão dos implantes em solução antimicrobiana. Avaliou-se morfometricamente as cápsulas peri-implantes após 30 dias da introdução. RESULTADOS: Os fatores com maior poder discriminante foram as células gigantes de corpo estranho e os mononucleares. Não houve correlação entre as concentrações bacterianas e as alterações histológicas. CONCLUSÕES: 1 O padrão histológico da reação inflamatória ao redor dos implantes de silicone revestidos com poliuretano é do tipo crônica granulomatosa de corpo estranho; 2 Não há correlação entre a concentração de bactérias Staphylococcus epidermidis e as alterações morfométricas; 3 O uso de solução antimicrobiana diminui a reação de células mononucleares, com aumento de células gigantes de corpo estranho.

  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. 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.

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

    African Journals Online (AJOL)

    Since the mid‑20th century, there has been an increase in interest in the implant process for the replacement of missing teeth. Branemark ... Ideal placement of the implant facilitates the establishment of favorable forces on the implants and the prosthetic component as well as ensures an aesthetic outcome. Therefore, it is ...

  3. 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

  4. Macro design morphology of endosseous dental implants.

    Science.gov (United States)

    Sahiwal, Indira G; Woody, Ronald D; Benson, Byron W; Guillen, Guillermo E

    2002-05-01

    The identification of dental implant bodies in patients without available records is a considerable problem due to increased patient mobility and to the large number of implant systems with different designs. The purpose of this study was to document the designs of selected implants to help clinicians identify these implants from their radiographic images. More than 50 implant manufacturers were contacted and asked to provide implants with dimensions as close as possible to 3.75 mm (diameter) x 10 mm (length). Forty-four implants were donated, separated into threaded and non-threaded categories, and further sorted into tapered and non-tapered categories. The implants were examined visually, and features on the entire circumference and length of each implant were recorded and categorized as coronal, midbody, or apical. A series of tables describe the 44 implants according to coronal, midbody, and apical features. The results of this project offer dentists basic knowledge of the design of selected dental implants. Such knowledge can aid the radiographic identification of these implants.

  5. PREJUÍZOS COGNITIVOS EM IDOSOS COM DIABETES MELLITUS TIPO 2

    Directory of Open Access Journals (Sweden)

    Regina Maria Fernandes Lopes

    2009-01-01

    Full Text Available El avance en las condiciones de salud propicia el progresivo aumento de la esperanza de vida. Estudios han identificado la existencia de una conexión entre la Diabetes Mellitus (DM y demencia. La hiperglicemia podría ser un factor importante en la incidencia de la enfermedad de Azheimer, la cual puede ser una causa secundaria de demencia. La diabetes mellitus tipo 2 (DM2 está asociada con déficits cognitivos y funcionales, y el WCST es una de las herramientas que puede ser utilizada para evaluar funcionamiento ejecutivo. El objetivo de este estudio fue evaluar los déficits cognitivos de ancianos con diabetes mellitus tipo 2. Los participantes fueron 254 ancianos de ambos sexos, mayores de 60 años; 44 de ellos diagnosticados de DM2 y 210 en un grupo control de población general. El diseño fue un estudio cuantitativo transversal. Los instrumentos utilizados fueron: datos sociodemográficos, WCST, MMSE, BDI, BAI, GD, junto a las Sub pruebas de: Vocabulario, códigos, números y Cubos del WAIS-III. Los resultados mostraron una diferencia significativa en el desempeño de los ancianos con diabetes tipo 2 en comparación con el grupo control en cuatro descriptores de WCST que indicaban un deterioro. Igualmente los ancianos con diabetes tipo 2 mostraron una intensidad de síntomas depresivos y de ansiedad estadísticamente mayor que el grupo control

  6. Artículos científicos: tipos, secciones y publicación

    OpenAIRE

    Reverter Masià, Joaquín; Hernández González, Vicenç

    2012-01-01

    Las revistas científicas han sido el principal vehículo de transmisión de conocimientos entre los investigadores y la comunidad científica. Investigar y publicar un artículo científico son dos actividades íntimamente relacionadas. Saber los tipos de publicación existentes, las secciones de un artículo y donde publicarlo es el objetivo de este trabajo.

  7. Protótipo do primeiro interferômetro brasileiro - BDA

    Science.gov (United States)

    Cecatto, J. R.; Fernandes, F. C. R.; Neri, J. A. C. F.; Bethi, N.; Felipini, N. S.; Madsen, F. R. H.; Andrade, M. C.; Soares, A. C.; Alonso, E. M. B., Sawant, H. S.

    2004-04-01

    A interferometria é uma poderosa ferramenta usada para investigar estruturas espaciais de fontes astrofísicas fornecendo uma riqueza de detalhes inatingível pelas técnicas convencionais de imageamento. Em particular, a interferometria com ondas de rádio abre o horizonte de conhecimento do Universo nesta ampla banda do espectro eletromagnético, que vai de cerca de 20 kHz até centenas de GHz já próximo ao infravermelho, e que está acessível a partir de instrumentos instalados em solo. Neste trabalho, apresentamos o interferômetro designado por Arranjo Decimétrico Brasileiro (BDA). Trata-se do primeiro interferômetro a ser desenvolvido no Brasil e América Latina que já está em operação na fase de protótipo. Apresentamos o desenvolvimento realizado até o momento, o sítio de instalação do instrumento, o protótipo e os principais resultados dos testes de sua operação, as perspectivas futuras e a ciência a ser desenvolvida com o instrumento nas fases II e III. Neste trabalho é dada ênfase ao desenvolvimento, testes de operação e principais resultados do protótipo. É discutida brevemente a ciência que pode ser feita com o instrumento. Tanto os detalhes técnicos quanto os principais parâmetros estimados para o instrumento nas próximas fases de desenvolvimento e o desempenho do protótipo serão publicados em breve.

  8. Establecimiento de reglas prosociales del tipo aumento formativo (augmenting formative) mediante entrenamiento en discriminaciones condicionales

    OpenAIRE

    Tiberio Pérez-Manrique; Andrea Martínez Uribe; Juan Silva Ocampo

    2009-01-01

    El objetivo del estudio fue examinar la eficiencia del entrenamiento en discriminaciones condicionales en el establecimiento de reglas prosociales del tipo aumento formativo. En el experimento participaron seis niños. Se utilizó el diseño intra-sujeto propuesto por Sidman y Tailby (1982) con dos condiciones, entrenamiento y prueba. Se aplicaron cuatro fases: establecimiento de clase funcional "cuidar de sí", establecimiento de la clase funcional "otros", establecimiento de la regla aumento...

  9. Compactones, soluciones de ecuaciones no lineales con estructura tipo esferas duras

    Directory of Open Access Journals (Sweden)

    Máximo Agüero Granados

    2001-01-01

    Full Text Available Se estudian ciertas soluciones de ecuaciones no lineales que modelan procesos físicos, que tienen semejanzas con estructuras coherentes del tipo de esferas duras, modelo de partículas muy usado en varias ramas de la física. Estas soluciones compactas (gotas, kinks, etcétera. interactúan entre sí sólo a cortas distancias, porque no poseen colas infinitas como los solitones clásicos.

  10. Resistência de genótipos de batata a Phthorimaea operculella (Zeller

    Directory of Open Access Journals (Sweden)

    Lopes Maria Teresa do Rêgo

    2001-01-01

    Full Text Available A traça Phthorimaea operculella (Zeller é considerada atualmente uma das principais pragas da batata. O uso de resistência varietal para controle desse inseto é uma alternativa promissora, mas que ainda precisa ser melhor pesquisada. A resistência de genótipos de batata à traça foi avaliada, em condições de laboratório, analisando-se o efeito de folhas e tubérculos sobre a biologia do inseto. Comparou-se também o desenvolvimento da traça em folhas de batata e tomate. Os experimentos foram conduzidos com os clones de batata NYL 235-4 e N 140-201 (ambos com tricomas glandulares tipo A nas folhas, as cultivares Aracy, Apuã e Itararé e a cultivar de tomate Santa Clara. Os insetos foram criados em folíolos e tubérculos dos genótipos, avaliando-se a duração e a viabilidade das fases larval e pupal e o peso de pupas. O desenvolvimento do inseto não foi afetado nas folhas dos genótipos de batata, mesmo nos materiais com tricomas glandulares. Entretanto, em folhas de tomate houve aumento do período larval e diminuição do peso de pupas, sendo este substrato menos favorável ao desenvolvimento da traça quando comparado às folhas de batata. Em testes com tubérculos, o clone NYL 235-4 apresentou resistência a P. operculella, provocando redução significativa na viabilidade larval e alongamento desta fase. O clone N 140-201 afetou o desenvolvimento do inseto de forma menos pronunciada, alongando a fase larval.

  11. Concepciones evolutivas acerca de la fabricación del dinero II: Los tipos de respuestas

    OpenAIRE

    Delval, Juan; Denegri Coria, Marianela

    2002-01-01

    En este artículo se profundiza en el análisis de los tipos de respuesta dados por los escolares ante cuestiones relativas al proceso de fabricación del dinero, teniendo en cuanta las diferencies en cuanto el nivel de complejidad de las respuestas aportadas por los sujetos de diferentes edades que fueron entrevistados. Ministerio de Ciencia y Tecnología (España) BSO2000-0064

  12. El modelo estocástico de Vasicek para la predicción de tipos de interés. Aplicación al tipo de interés interbancario EONIA

    OpenAIRE

    TAMARIT RAMOS, SALVADOR

    2013-01-01

    [ES] Las variaciones de los tipos de interés ofrecidos por el dinero en bancos y otras entidades financieras afectan directamente a los mercados bursátiles. Así, por ejemplo, cuando los tipos de interés suben, se producen bajadas en las cotizaciones de las acciones en la bolsa. Estos movimientos decrecientes pueden explicarse por diferentes razones. En primer lugar, los altos tipos de interés elevan las cargas financieras de las empresas y, por lo tanto, empeoran los resultados económicos, lo...

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

    OpenAIRE

    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 i...

  14. Primary prevention of peri-implantitis: Managing peri-implant mucositis

    OpenAIRE

    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; Schwarz, Frank; Serino, Giovanni

    2015-01-01

    Abstract AIMS: 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 considere...

  15. Incidência de tripes em genótipos de cebola

    Directory of Open Access Journals (Sweden)

    Paulo Antonio de Souza Gonçalves

    2017-05-01

    Full Text Available Os objetivos deste estudo foram avaliar a incidência de tripes em genótipos de cebola, verificar sua correlação com o teor de clorofila, arquitetura e coloração foliar, e produtividade. O experimento foi conduzido na Epagri, Estação Experimental de Ituporanga, SC, Brasil, na safra de 2015. O número de genótipos comerciais ou em desenvolvimento avaliados foi 48, sendo doze híbridos e 36 de polinização livre. A incidência de tripes foi semelhante na maioria dos genótipos. As exceções foram os híbridos precoces Roxa 10039 e 10160, que apresentaram menores notas de incidência que RDW Luthy e Conesul. A arquitetura foliar mais aberta associada com a cor verde clara favoreceu uma menor incidência de tripes. Os cultivares de polinização livre e com origem no programa de melhoramento da Epagri (Superprecoce-Agroecológica, Bola Precoce-Agroecológica, Juporanga-Agroecológica, Valessul, Bola Suprema e Crioula Alto Vale foram os mais produtivos.

  16. Efecto incretina en el tratamiento de la diabetes mellitus tipo 2

    Directory of Open Access Journals (Sweden)

    Manuel de Jesús Díaz Pérez

    2015-02-01

    Full Text Available El efecto incretina está dado por las funciones del polipéptido insulinotrópico dependiente de glucosa y un péptido similar a glucagón sobre la hiperglucemia en el organismo humano. Desde su descubrimiento ha cobrado un papel cada vez más significativo en la elaboración de nuevos fármacos normoglucemiantes, que logren el control metabólico de los pacientes con diabetes mellitus tipo 2. El objetivo de esta revisión es actualizar la información sobre el efecto incretina, su relación con la diabetes mellitus tipo 2, los fármacos cuyo mecanismo de acción se basa en este fenómeno fisiológico, así como las perspectivas para el futuro inmediato en este tema. Para ello se realizó una revisión bibliográfica, empleando servicios disponibles desde la red Infomed, específicamente: SciELO, Hinari, PubMed y EBSCO. Se resumen aspectos del sustrato fisiológico y fisiopatológico del efecto incretina y su aplicación en la terapéutica de los pacientes con diabetes mellitus tipo 2, así como los resultados positivos que se han logrado hasta el momento en este campo

  17. Determinantes del tipo de cambio real en Colombia. Un modelo neokeynesiano

    Directory of Open Access Journals (Sweden)

    Moreno Rivas, Álvaro Martín

    2002-12-01

    Full Text Available Este artículo presenta un modelo de tipo de cambio real siguiendo los desarrollos de la escuela neokeynesiana. Se estima econométricamente de acuerdo con la metodología de la escuela inglesa de econometría. El modelo empírico incorpora una dinámica interesante y respeta las restricciones de equilibrio de largo plazo entre el tipo de cambio real y los fundamentales macroeconómicos. Se encuentra que el ritmo de apreciación o depreciación del tipo de cambio real está determinado por los cambios en los términos de intercambio, la apertura de la economía, los flujos de capitales y la aceleración de la devaluación nominal. El incremento del gasto público no es significativo a los niveles convencionales de confianza estadística. Finalmente se evalúa si la devaluación cumple con los requisitos de exogeneidad débil, exogeneidad fuerte y superexogeneidad.

  18. Tipos de tirano y resistencia en Francisco Suárez

    Directory of Open Access Journals (Sweden)

    Pablo Font Oporto

    2017-09-01

    Full Text Available El presente artículo pretende analizar la discusión que Francisco Suárez mantiene con las tesis contrarias a la distinción entre tipos de tirano en la cuestión del tiranicidio (Defensio fidei, Libro VI, capítulo IV, números 10-13. Para esta visión no le es lícito a una persona privada matar a ninguno de los dos tipos de tirano; sólo es posible darles muerte en legítima defensa, porque se entiende que en tal caso se actúa en ejercicio de autoridad pública. Suárez acaba admitiendo esta tesis en el número 13, lo que parece contradecirse con lo sostenido en el número 7, donde se aceptaba la muerte del usurpador por cualquier particular. Sin embargo, en el fondo mantiene la diferencia entre ambos tipos de tirano, por cuanto que en el caso del usurpador sostiene que siempre se dan las condiciones para alegar legítima defensa. Queda sin aclarar qué ocurre en tal caso con las condiciones dispuestas en los números 8 y 9.

  19. Evolución de los pacientes con complicaciones locales en la bolsa del generador de un dispositivo implantable

    OpenAIRE

    Izquierdo,Maite; Bonanad,Clara; Madrazo,Inés; Ferrero,Ángel; Martínez,Ángel; Morell,Salvador; Chorro,Javier; Ruiz-Granell,Ricardo

    2014-01-01

    Objetivo: Las recomendaciones para la extracción completa de la bolsa de dispositivos implantables por problemas locales han cambiado. Analizamos la evolución entre 2002 y 2010 de los pacientes que requirieron una intervención por una complicación local en nuestro centro. Métodos: Ochenta y tres pacientes tuvieron un problema local de la bolsa que se clasificó según integridad de la piel: 1. Íntegra y 2. Abierta, y el tipo de intervención realizada: 1. Conservadora, 2. Extracción parcial y 3....

  20. Cochlear implant after bacterial meningitis.

    Science.gov (United States)

    Bille, Jesper; Ovesen, Therese

    2014-06-01

    The aim of this retrospective case study at a tertiary referral center was to investigate the outcome of cochlear implantation (CI) in children with sensorineural hearing loss due to meningitis compared to CI in children with deafness due to other reasons. This post-meningial group (PMG) consisted of 22 children undergoing CI due to deafness induced by meningitis, between December 1996 and January 2012. Five children had bilateral simultaneous implantation. None was excluded and the children were followed for at least 3 years. Operations were carried out by one of two surgeons using similar techniques in all cases. Each patient from the PMG was matched 2:1 with children having implantation for other reasons according to age and follow up (control group). Overall, the median category of auditory performance (CAP) and speech intelligibility rating (SIR) score were not statistically significantly different between the two groups. The presence of additional central nervous system (CNS) disorders (post-meningeal sequelae), however, correlated significantly with poorer outcome CI was a safe procedure without surgical complications in the present study. It is possible to restore auditory capacity and speech performance to a degree comparable to children undergoing implantation for other reasons. A statistically important variable is secondary CNS involvement. The rehabilitation program after CI should be adjusted according to these additional handicaps. It is recommended to screen meningitis patients as fast as possible to identify those with hearing loss and initiate treatment with hearing aids or CI. © 2013 The Authors. Pediatrics International © 2013 Japan Pediatric Society.

  1. Annealing of ion implanted silicon

    International Nuclear Information System (INIS)

    Chivers, D.; Smith, B.J.; Stephen, J.; Fisher, M.

    1980-09-01

    The newer uses of ion implantation require a higher dose rate. This has led to the introduction of high beam current implanters; the wafers move in front of a stationary beam to give a scanning effect. This can lead to non-uniform heating of the wafer. Variations in the sheet resistance of the layers can be very non-uniform following thermal annealing. Non-uniformity in the effective doping both over a single wafer and from one wafer to another, can affect the usefulness of ion implantation in high dose rate applications. Experiments to determine the extent of non-uniformity in sheet resistance, and to see if it is correlated to the annealing scheme have been carried out. Details of the implantation parameters are given. It was found that best results were obtained when layers were annealed at the maximum possible temperature. For arsenic, phosphorus and antimony layers, improvements were observed up to 1200 0 C and boron up to 950 0 C. Usually, it is best to heat the layer directly to the maximum temperature to produce the most uniform layer; with phosphorus layers however it is better to pre-heat to 1050 0 C. (U.K.)

  2. Implantation of boron in silicon

    International Nuclear Information System (INIS)

    Hofker, W.K.

    1975-01-01

    The distribution versus depth of boron implanted in silicon and the corresponding electrical activity obtained after annealing are studied. The boron distributions are measured by secondary-ion mass spectrometry. Boron distributions implanted at energies in the range from 30 keV to 800 keV in amorphous and polycrystalline silicon are analysed. Moments of these distributions are determined by a curve-fitting programme and compared with moments calculated by Winterbon. Boron distributions obtained by implantations along a dense crystallographic direction in monocrystalline silicon are found to have penetrating tails. After investigation of some possible mechanisms of tail formation it is concluded that the tails are due to channelling. It was found that the behaviour of boron during annealing is determined by the properties of three boron fractions consisting of precipitated boron, interstitial boron and substitutional boron. The electrical activity of the boron versus depth is found to be consistent with the three boron fractions. A peculiar redistribution of boron is found which is induced by the implantation of a high dose of heavy ions and subsequent annealing. Different mechanisms which may cause the observed effects, such as thermal diffusion which is influenced by lattice strain and damage, are discussed. (Auth.)

  3. [Dental implant restoration abutment selection].

    Science.gov (United States)

    Bin, Shi; Hao, Zeng

    2017-04-01

    An increasing number of implant restoration abutment types are produced with the rapid development of dental implantology. Although various abutments can meet different clinical demands, the selection of the appropriate abutment is both difficult and confusing. This article aims to help clinicians select the appropriate abutment by describing abutment design, types, and selection criteria.

  4. Reading skills after cochlear implantation

    NARCIS (Netherlands)

    Vermeulen, A.M.

    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

  5. 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.

  6. Cochlear implant: the family's perspective.

    Science.gov (United States)

    Vieira, Sheila de Souza; Dupas, Giselle; Chiari, Brasilia Maria

    2018-07-01

    To understand the family's experience of a child who uses a cochlear implant (CI). Specifically, to identify the difficulties, changes, and feelings entailed by deafness and the use of the CI; the coping strategies; and to understand the role of the family for the child with a CI. Qualitative research, using Symbolic Interactionism and Straussian Grounded Theory as the theoretical and methodological frameworks, respectively. Data collection instrument: semi-structured interview. A total of 9 families (32 individuals) participated in the study. The children's ages ranged from 6 to 11 years old (mean = 8.9 years old). Their experience is described in the following categories: Having to fight for results, Coping with difficult situations, Recognizing that you are not alone, Learning to overcome, and Having one's life restored by the implant. Cochlear implantation changes the direction of the child and the family's life by restoring the child's opportunity to hear and to obtain good results in her personal, social, and academic development. Even after implantation, the child continues to experience difficulties and requires the family's mobilization in order to be successful. The family is the principal actor in the process of the child's rehabilitation.

  7. Usher syndrome and cochlear implantation.

    Science.gov (United States)

    Loundon, Natalie; Marlin, Sandrine; Busquet, Denise; Denoyelle, Françoise; Roger, Gilles; Renaud, Francis; Garabedian, Erea Noel

    2003-03-01

    To evaluate the symptoms leading to diagnosis and the quality of rehabilitation after cochlear implantation in Usher syndrome. Retrospective cohort study. ENT department of a tertiary referral hospital. Among 210 patients given an implantation in the Ear, Nose, and Throat department, 185 were congenitally deaf and 13 had Usher syndrome (7.0%). Five had a family history of Usher, and eight were sporadic cases. Eleven cases were Usher type I, one was Usher type III, and one was not classified. The age at implantation ranged from 18 months to 44 years (mean, 6 years 1 month). The mean follow-up was 52 months (range, 9 months to 9 years). All patients had audiophonological and clinical examination, computed tomography scan of the temporal bones, ophthalmologic examination with fundoscopy, and an electroretinogram. Cerebral magnetic resonance imaging and vestibular examination were performed in 9 of 13 and 10 of 13 cases, respectively. Logopedic outcome measured preimplant and postimplant closed- and open-set word recognition and oral expression at follow-up. The most frequent initial sign of Usher syndrome was delayed walking, with a mean age of 20 months. Among the 172 other congenitally deaf children with implants, when deafness was not associated with other neurologic disorders, the mean age at walking was 14 months (p < 0.001). The fundoscopy was always abnormal after the age of 5 years, and the electroretinogram was abnormal in all cases. Vestibular function was abnormal in all but one case (nonclassified). The computed tomography scan and the magnetic resonance imaging were always normal. Logopedic results with cochlear implants showed good perception skills in all but one case. The best perceptive results were obtained in children implanted before the age of 9 years. Oral language had significantly progressed in 9 of 13 at follow-up. There was no relation between the visual acuity and the logopedic results. The earliest clinical sign associated with deafness

  8. 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.

  9. 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.

  10. He reemission implanted in metals

    International Nuclear Information System (INIS)

    Tanabe, T.

    2014-01-01

    Highlights: • Observation of He reemission of various metals under He + implantation at wide temperature range. • Materials examined are aluminum (Al), Nickel (Ni) and molybdenum (Mo). • He reemission is quite temperature dependent and different with materials. • Three metals show similar dependence on temperature normalized with respective melting point. • He reemission is successfully correlated with He behavior in metals. - Abstract: Helium (He) reemission of Al, Ni and Mo under energetic He implantation (10–30 keV) in wide temperature range is studied to understand behavior of implanted He in correlation with structure changes. The reemission behavior is categorized into 4 different temperature ranges with the normalized temperature (T m ) to the melting point of each metal. At elevated temperatures (well above ∼0.6 T m ), interstitial He atoms and/or He-vacancy (ies) clusters can migrate remaining no structure change and showing smooth reemission without any burst. Between ∼0.25 and 0.6 T m , He reemission always accompanies significant structure modification. For ∼04–0.6 T m , implanted He coalesce to make bubbles and the bubbles can move to the surface. Bubble migration accompanies materials flow to the surface resulting in fuzz surface or columnar structure, depending on implantation flux. Slower bubble motion at ∼0.25–0.4 prohibits the material migration. Instead the bubbles coalesce to grow large and multi-layered blistering appears as periodic reemission behavior. Below ∼0.25 T m , He migration is too slow for bubbles to grow large, but bubble density increases up to a certain fluence, where neighboring bubbles start to coalesce. Accordingly, He release is mostly caused by mechanical failure or blister rapture. With increasing fluence, all defects (bubbles and dislocation loops) tangle or inter connected with neighboring defects and accordingly He migration to the surface along the tangled or connected defects is enhanced

  11. [Cochlear implant treatment in Germany].

    Science.gov (United States)

    Jacob, R; Stelzig, Y

    2013-01-01

    Restoration of impaired auditory function through cochlear implant is possible, with high reliably and great success. Nevertheless, there are regular disputes between patients and insurance companies due to high costs. In Germany, approx. 1.9 Mio. people are severely hearing impaired. It can be estimated that for adequate hearing rehabilitation about 30,000 cochlear implants/year are necessary. Currently, less than 10% of those affected are offered cochlear implant. A handicap is defined if there is deviation from normal hearing for more than 6 months. This sets a time frame for the supply with cochlear implant after sudden deafness. The professional code requires to advice all medical options to a person seeking help for hearing loss. This includes benefit-risk consideration. At this point, the economic aspect plays no role. The indication for medical treatment is only subject to the treating physician and should not be modified by non-physicians or organizations. It should be noted that a supply of hearing aids is qualitatively different to the help from a cochlear implant, which provides a restoration of lost function. In social law (SGB V and IX) doctors are requested to advise and recommend all measures which contribute to normal hearing (both sides). This indicates that doctors may be prosecuted for not offering help when medically possible, just because health insurance employees did not approve the cost balance. The current situation, with insufficient medical care for the hearing impaired, needs clarifying. To do this, patients, health insurance companies, the political institutions, legislation and professional societies need to accept their responsibilities.

  12. Alimentación de niños con diabetes mellitus tipo 1 con respecto a las recomendaciones

    OpenAIRE

    San Martín Jiménez, Rocío

    2014-01-01

    Introducción: La diabetes tipo 1 es una enfermedad crónica prevalente en la infancia, siendo unos de los pilares fundamentales de su tratamiento la alimentación. Diseñamos un estudio para valorar el grado de cumplimiento de las recomendaciones nutricionales de los pacientes pediátricos con diabetes tipo 1. Diseño y métodos. Estudio observacional transversal de 50 niños y adolescentes con diabetes tipo 1, que acuden al Hospital Clínico Universitario de Valladolid. La ingesta fue recogida me...

  13. Peri-implant esthetics assessment and management

    Science.gov (United States)

    Balasubramaniam, Aarthi S.; Raja, Sunitha V.; Thomas, Libby John

    2013-01-01

    Providing an esthetic restoration in the anterior region of the mouth has been the basis of peri-implant esthetics. To achieve optimal esthetics, in implant supported restorations, various patient and tooth related factors have to be taken into consideration. Peri-implant plastic surgery has been adopted to improve the soft tissue and hard tissue profiles, during and after implant placement. The various factors and the procedures related to enhancement of peri-implant esthetics have been discussed in this review article. PMID:23878557

  14. Structural-chemical characteristics of implanted metals

    International Nuclear Information System (INIS)

    Kozejkin, B.V.; Pavlov, P.V.; Pitirimova, E.A.; Frolov, A.I.

    1988-01-01

    Corrosion and structural characteristics of metallic layers implanted by ions of chemically active impurities and noble gases are studied. Dependence of experimental results on parameters of initial materials and technological conditions of implantation is established. In studying corrosion characteristics of implanted metals a strong dependence of chemical passivation effect on technological conditions of ion-implantation and structure of initial material is stated. On the basis of developed mathematical model of chemical passivation effect it is shown that increase of corrosion characteristics of implanted metals is defined by superposition of surface and volumetric mechanisms

  15. Current Concepts in Restorative Implant Dentistry

    Institute of Scientific and Technical Information of China (English)

    Prof.Marchack

    2009-01-01

    Patients today are incteasingly aware of dental implants.and their expectations are for esthetically and functionally pleasingimplant restorations that mimic natural teeth.This presentation will give both the experienced and novice practitioner a better understand-ing of how restorative implant dentistry has evolved.Treatment planning and restorative options for single implants.multiple implants andfully edentulons arches will be discussed,and the use of modern materials and CADCAM technology in fabricating the most contemporaryfixed implant supported prostheses will be demonstrated.

  16. CRESCIMENTO INICIAL DE GENÓTIPOS DE PINHÃO MANSO REPRODUZIDOS ASSEXUADAMENTE

    Directory of Open Access Journals (Sweden)

    Amanda Macedo Facirolli

    2012-09-01

    Full Text Available Normal 0 21 false false false PT-BR X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Objetivou-se com este trabalho avaliar o crescimento inicial de genótipos de pinhão manso reproduzidos via propagação assexuada. O experimento constitui-se de dezoito tratamentos (dezoito genótipos de pinhão manso dispostos em blocos casualizados, com quatro repetições. Avaliou-se altura de planta, diâmetro de colmo, índice de pegamento, número de hastes, número de cachos, e índice de clorofila por planta. Houve significância da interação entre os genótipos, ao nível de 1% de probabilidade para todas as características avaliadas. Os genótipo 1, 4, e 17 mostraram-se superiores sobre os demais pois apresentaram maiores número de hastes e de cachos por planta, maior diâmetro do colmo, índice de pegamento e maior índice de clorofila, podendo ser apontados como genótipos promissores para futuros programas de melhoramento genéticos.

  17. Estudo da topografia e da osseointegração de implante de titânio sob ação do LASER, com ou sem deposição de hidroxiapatita, em coelhos

    OpenAIRE

    Sisti, Karin Ellen

    2011-01-01

    Objetivo: Estudar a topografia a osseointegração de implantes de titânio sob ação do LASER de alta intensidade com e sem deposição química de hidroxiapatita, em coelhos. Método: Foram utilizados 30 coelhos albinos que receberam em suas tíbias 3 tipos de superfície de implantes: grupo controle(GI) implantes usinados, grupo(GII) irradiado LASER(Yb), e grupo irradiado e depositado hidroxiapatita pelo método biomimético(GIII). Após os períodos de avaliações (30 e 60 dias) os implantes foram subme...

  18. Poly Implants Prosthèse Breast Implants: A Case Series and Review of the Literature.

    Science.gov (United States)

    Klein, Doron; Hadad, Eran; Wiser, Itay; Wolf, Omer; Itzhaki Shapira, Ortal; Fucks, Shir; Heller, Lior

    2018-01-01

    Silicone breast implants from the French manufacturer Poly Implants Prosthèse (PIP) were recalled from the European market after the French regulator has revealed the implants contain non-medical-grade silicone filler. In December 2011, following a large increase in reported rupture rate and a possible cancer risk, the French Ministry of Health recommended consideration of the PIP explantation, regardless of their condition. In 2012, the Israel Ministry of Health recommended to replace the implants only upon suspected implant rupture. The aims of this study were to characterize breast-augmented Israeli patients with PIP implants, compare their outcomes with those of breast-augmented patients with different implant types, and review the current PIP literature. Breast-augmented patients who underwent an elective breast implant exchange in Israel between January 2011 and January 2017 were included in the study. Data were collected from electronic and physical medical files. There were 73 breast-augmented female patients with 146 PIP breast implants included in this study. Average implant age was 6.7 ± 2.79 years. Mean implant size was 342.8 ± 52.9 mL. Fourteen women (19 implants [16%]) had a high-grade capsular contracture (Baker grade 3-4). During exchange, 28 implants were found to be ruptured (19.2%). Less than 10 years following breast augmentation, PIP implants demonstrated higher rupture rate compared with other implants. Our data are comparable to overall available rupture rate. Among patients with definitive rupture diagnosis, an elective implant removal should be recommended. In cases of undamaged implants, plastic surgeons should also seriously consider PIP implant explantation. When the patient does not desire to remove the implant, an annual physical examination and breast ultrasound are recommended, beginning a year after augmentation.

  19. [Clinical application of individualized three-dimensional printing implant template in multi-tooth dental implantation].

    Science.gov (United States)

    Wang, Lie; Chen, Zhi-Yuan; Liu, Rong; Zeng, Hao

    2017-08-01

    To study the value and satisfaction of three-dimensional printing implant template and conventional implant template in multi-tooth dental implantation. Thirty cases (83 teeth) with missing teeth needing to be implanted were randomly divided into conventional implant template group (CIT group, 15 cases, 42 teeth) and 3D printing implant template group (TDPIT group, 15 cases, 41 teeth). Patients in CIT group were operated by using conventional implant template, while patients in TDPIT group were operated by using three-dimensional printing implant template. The differences of implant neck and tip deviation, implant angle deviation and angle satisfaction between the two groups were compared. The difference of probing depth and bone resorption of implant were compared 1 year after operation between the two groups. The difference of success rate and satisfaction of dental implantation were compared 1 year after operation between the two groups. SPSS19.0 software package was used for statistical analysis. The deviation direction of the neck and the tip in disto-mesial, bucco-palatal, vertical direction and angle of implants in disto-mesial and bucco-palatal direction in TDPIT group were significantly lower than in CIT group (P0.05). The difference of the cumulative success rate in dental implantation at 3 months and 6 months between the two groups were not significant (P>0.05), but the cumulative success rate of TDPIT group was significantly higher than CIT group at 9 months and 1 year (90.48% vs 100%,P=0.043). The patients' satisfaction rate of dental implantation in TDPIT group was significantly higher than in CIT group (86.67% vs 53.33%, P=0.046). Using three-dimensional printing implant template can obtain better accuracy of implant, higher implant success rate and better patients' satisfaction than using conventional implant template. It is suitable for clinical application.

  20. Ion implantation and bio-compatibility

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Yoshiaki; Kusakabe, Masahiro [Sony Corp., Tokyo (Japan). Corporate Research Labs.; Iwaki, Masaya

    1992-07-01

    Surface modification of polymers by ion implantation has been carried out to control surface properties such as conductivity, wettability, blood and tissue compatibility. Ion implantation into silicone rubber, polystyrene and segmented polyurethane was performed at 150 keV with doses ranging from 1 x 10[sup 15] to 3 x 10[sup 17] ions/cm[sup 2] to improve bio-compatibility. The platelet accumulation on ion implanted silicone rubber decreased and non-thrombogenicity of ion implanted specimens were improved. The ion implanted polystyrene and segmented polyurethane have been found to exhibit remarkably higher adhesion and spreading of endothelial cells compared to the non-implanted case. It is concluded that ion implantation into polymers is effective in controlling their bio-compatibility. (author).

  1. 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...

  2. 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.

  3. Magnetic resonance imaging of breast implants.

    Science.gov (United States)

    Shah, Mala; Tanna, Neil; Margolies, Laurie

    2014-12-01

    Silicone breast implants have significantly evolved since their introduction half a century ago, yet implant rupture remains a common and expected complication, especially in patients with earlier-generation implants. Magnetic resonance imaging is the primary modality for assessing the integrity of silicone implants and has excellent sensitivity and specificity, and the Food and Drug Administration currently recommends periodic magnetic resonance imaging screening for silent silicone breast implant rupture. Familiarity with the types of silicone implants and potential complications is essential for the radiologist. Signs of intracapsular rupture include the noose, droplet, subcapsular line, and linguine signs. Signs of extracapsular rupture include herniation of silicone with a capsular defect and extruded silicone material. Specific sequences including water and silicone suppression are essential for distinguishing rupture from other pathologies and artifacts. Magnetic resonance imaging provides valuable information about the integrity of silicone implants and associated complications.

  4. 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.

  5. 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.

  6. 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.

  7. Comparative silicone breast implant evaluation using mammography, sonography, and magnetic resonance imaging: experience with 59 implants.

    Science.gov (United States)

    Ahn, C Y; DeBruhl, N D; Gorczyca, D P; Shaw, W W; Bassett, L W

    1994-10-01

    With the current controversy regarding the safety of silicone implants, the detection and evaluation of implant rupture are causing concern for both plastic surgeons and patients. Our study obtained comparative value analysis of mammography, sonography, and magnetic resonance imaging (MRI) in the detection of silicone implant rupture. Twenty-nine symptomatic patients (total of 59 silicone implants) were entered into the study. Intraoperative findings revealed 21 ruptured implants (36 percent). During physical examination, a positive "squeeze test" was highly suggestive of implant rupture. Mammograms were obtained of 51 implants (sensitivity 11 percent, specificity 89 percent). Sonography was performed on 57 implants (sensitivity 70 percent, specificity 92 percent). MRI was performed on 55 implants (sensitivity 81 percent, specificity 92 percent). Sonographically, implant rupture is demonstrated by the "stepladder sign." Double-lumen implants may appear as false-positive results for rupture on sonography. On MRI, the "linguine sign" represents disrupted fragments of a ruptured implant. The most reliable imaging modality for implant rupture detection is MRI, followed by sonogram. Mammogram is the least reliable. Our study supports the clinical indication and diagnostic value of sonogram and MRI in the evaluation of symptomatic breast implant patients.

  8. Los ejemplares tipo de Cicadellinae y Gyponinae (Hemiptera: Auchenorrhyncha: Cicadellidae depositados en el Museo de La Plata, Argentina

    Directory of Open Access Journals (Sweden)

    Susana L. PARADELL

    2010-01-01

    Full Text Available En la presente contribución, se realizó un relevamiento de los ejemplares tipo de Cicadellidae, depositados en la colección de la División Entomología del Museo de La Plata (MLP. Fueron examinados y listados 86 ejemplares tipo pertenecientes a 32 especies: siete Cicadellinae y 25 Gyponinae, las que fueron descriptas por los siguientes autores: Berg, DeLong, DeLong & Freytag, DeLong & Martinson, Spångberg , Tesón y Young. Para cada ejemplar tipo se brinda información acerca del nombre específico, referencia bibliográfica, categoría de tipo y procedencia.

  9. Resistência de biótipos de arroz-vermelho aos herbicidas imazapyr + imazapic e alternativas de controle

    Directory of Open Access Journals (Sweden)

    Rafael Salles Rubin

    2014-10-01

    Full Text Available O uso intenso de herbicidas com o mesmo mecanismo de ação na cultura do arroz (Oryza sativa L. tem selecionado biótipos resistentes, como, por exemplo, o arroz-vermelho (planta daninha resistente aos herbicidas imidazolinonas. Por essa razão, este trabalho foi desenvolvido com o objetivo de avaliar a resistência de arroz-vermelho ao herbicida imazapyr + imazapic, na região sul do Rio Grande do Sul, e o controle do biótipo resistente de arroz-vermelho com os herbicidas alternativos clethodim e glyphosate. Foram realizados três experimentos, em delineamento casualizado, arranjados em esquema fatorial. No primeiro experimento, o fator A testou biótipos de arroz-vermelho [ORYSA 184 (resistente e ORYSA 188 (susceptível], o fator B comparou herbicidas (imazapyr + imazapic, clethodim e glyphosate e o fator C avaliou doses dos herbicidas (0; 0,5; 1; 2; 4; 8; 16 e 32 vezes a dose recomendada. No segundo, compararam-se biótipos de arroz-vermelho e doses do herbicida imazapyr + imazapic (0; 0,5; 1; 2; 4; 8; 16; 32 e 64 vezes a dose recomendada. No terceiro, testaram-se biótipos de arroz-vermelho e doses diferentes do herbicida imazapyr + imazapic para cada biótipo. O biótipo ORYSA 184 é resistente ao imazapyr + imazapic, quando aplicada a dose máxima de registro e estádio indicado. Os herbicidas clethodim e glyphosate, detentores de mecanismos de ação alternativos, controlam o biótipo resistente ORYSA 184 de arroz-vermelho.

  10. Erbium implantation in Strontium Titanate

    CERN Document Server

    Araújo, J P; Alves, E; Correia, J G; Monteiro, T; Soares, J; Santos, L

    2002-01-01

    We report on the lattice location of Er in SrTiO$_{3}$ single crystals using the emission channeling technique. The angular distribution of conversion electrons emitted from $^{167m}$Er(T$_{1/2}$=2.27 s) was monitored with a position-sensitive detector following the room-temperature 60 keV implantation of the precursor isotope $^{167}$Tm(T$_{1/2}$=9.25 d) to a dose of 2$\\times$ 10$^{12}$ at./cm$^{2}$. The results for the sample annealed in vacuum at 610°C for 15 min provide direct evidence that Er occupies both Sr and Ti substitutional lattice sites. In addition, thermal recovery of lattice damage was also studied with RBS/C for SrTiO$_{3}$ implanted to doses of 5$\\times$ 10$^{14}$ and 5 $\\times$ 10$^{15}$ Er/cm$^{2}$. We further comment on preliminary photoluminescence results from these samples.

  11. Implantable Neural Interfaces for Sharks

    Science.gov (United States)

    2007-05-01

    technology for recording and stimulating from the auditory and olfactory sensory nervous systems of the awake, swimming nurse shark , G. cirratum (Figures...overlay of the central nervous system of the nurse shark on a horizontal MR image. Implantable Neural Interfaces for Sharks ...Neural Interfaces for Characterizing Population Responses to Odorants and Electrical Stimuli in the Nurse Shark , Ginglymostoma cirratum.” AChemS Abs

  12. Tooth Retained Implant: No More an Oxymoron

    Directory of Open Access Journals (Sweden)

    Divya Bhat

    2011-03-01

    Full Text Available Introduction: Periodontally af-fected teeth are treated in one of the two ways. (1 Tooth retention after periodontal surgery, in which the degree of regeneration achieved is unpredictable. (2 Tooth extrac-tion and implant placement. Implants have an osseointegrated surface which does not provide adequate shock absorption. Regeneration can be achieved by resecting the crown of the affected tooth and submerging the root. This technique has not had a clinical application so far as the tooth becomes difficult to restore. Placing an implant within the root can make the retained root restorable. At the same time, as the implant is placed within the root surface it achieves a periodontal integration which dampens occlusal forces better than osseointegration. Therefore, such a “tooth retained implant” may serve as an additional treatment option with significant benefits over tooth retention and implant placement alone. The hypothesis: Implants placed within retained roots have shown cementum deposition and attachment of periodontal ligament fibers over their surface. This periodontal attachment may be able to dam-pen forces better than in an osseointegrated implant. Moreover, since an implant is being placed, the crown of the tooth can be resected and submerged. This prevents epithelial migration, allows for the periodontal ligament cells to populate the wound and favors regeneration.Evaluation of the hypothesis: The technique of placing implants within cavities prepared in the root and then submerging them are simple for any practitioner placing implants routinely.

  13. 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.

  14. 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.

  15. 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.

  16. Customizable cap implants for neurophysiological experimentation.

    Science.gov (United States)

    Blonde, Jackson D; Roussy, Megan; Luna, Rogelio; Mahmoudian, Borna; Gulli, Roberto A; Barker, Kevin C; Lau, Jonathan C; Martinez-Trujillo, Julio C

    2018-04-22

    Several primate neurophysiology laboratories have adopted acrylic-free, custom-fit cranial implants. These implants are often comprised of titanium or plastic polymers, such as polyether ether ketone (PEEK). Titanium is favored for its mechanical strength and osseointegrative properties whereas PEEK is notable for its lightweight, machinability, and MRI compatibility. Recent titanium/PEEK implants have proven to be effective in minimizing infection and implant failure, thereby prolonging experiments and optimizing the scientific contribution of a single primate. We created novel, customizable PEEK 'cap' implants that contour to the primate's skull. The implants were created using MRI and/or CT data, SolidWorks software and CNC-machining. Three rhesus macaques were implanted with a PEEK cap implant. Head fixation and chronic recordings were successfully performed. Improvements in design and surgical technique solved issues of granulation tissue formation and headpost screw breakage. Primate cranial implants have traditionally been fastened to the skull using acrylic and anchor screws. This technique is prone to skin recession, infection, and implant failure. More recent methods have used imaging data to create custom-fit titanium/PEEK implants with radially extending feet or vertical columns. Compared to our design, these implants are more surgically invasive over time, have less force distribution, and/or do not optimize the utilizable surface area of the skull. Our PEEK cap implants served as an effective and affordable means to perform electrophysiological experimentation while reducing surgical invasiveness, providing increased strength, and optimizing useful surface area. Crown Copyright © 2018. Published by Elsevier B.V. All rights reserved.

  17. Implantation rate effects on microstructure

    International Nuclear Information System (INIS)

    Choyke, W.J.; Spitznagel, J.A.; Wood, S.; Doyle, N.J.

    1981-01-01

    We report a detailed TEM study of rate effects in a metal (304 SS) where we dope with an insoluble atom (He) and create the displacement damage with high energy Si. The rates of doping and the rates of producing lattice damage are independently varied during dual implantation. In addition to varying the doping rates of the He the magnitude of the displacement damage prior to He implantation is also varied (beam history). We find that the beam history has virtually no effect on maximum bubble size but it has a major effect on the average cavity diameter. A weak dependence of cavity number density on helium implantation rate is found. The total dislocation density is relatively independent of the doping rate and beam history at 550 and 700 0 C, whereas the loop fraction is sensitive to beam history at these temperatures. Acicular precipitate formation is weakly dependent on doping, doping rate and more strongly dependent on doping concentration and temperature. This form of solute segregation is very sensitive to beam history. (orig.)

  18. Financiarización del tipo de cambio en México y la actividad productiva

    Directory of Open Access Journals (Sweden)

    Antonio Mendoza Hernández

    2016-01-01

    Full Text Available Existe una estrecha relación entre el fortalecimiento del proceso de financiarización y la gestión de las diferentes monedas. Dicha relación aparece cuando en los espacios monetarios locales se abandona la demanda de moneda nacional en beneficio de alguna otra moneda o cualquier objeto especulativo. Se trata de una política económica a favor del beneficio financiero. En la gestión de las monedas locales, se impone la nueva norma de las altas finanzas: remuneración elevada, inflación escasa. El tipo de cambio en México está en función de las condiciones de confianza y rentabilidad del beneficio financiero. Las fluctuaciones en el tipo de cambio se convirtien en un factor determinante de las variaciones experimentadas por los flujos de tesorería, las ventas, los beneficios y los activos de las grandes empresas dedicadas a la actividad productiva cotizados en diversas monedas. Lo anterior se traduce en un atractivo para el capital monopolista ­financiero local, pues significa no sólo mantener su riqueza financiera y recibir íntegramente sus intereses, sino que también verse premiadas con un beneficio financiero, en su propia moneda. La certidumbre relativa sobre la evolución del tipo de cambio en la economía mexicana es una acción necesaria para que un sector importante de las grandes empresas relacionadas al capital – monopolista financiero mantenga sus condiciones de rentabilidad.

  19. El coste de la diabetes tipo 2 en España: El estudio CODE-2

    Directory of Open Access Journals (Sweden)

    Mata M.

    2002-01-01

    Full Text Available Objetivo: Estimar el coste de la atención sanitaria al paciente diabético tipo 2, diferenciando el gasto derivado del control de la enfermedad, de la atención de sus complicaciones y de otros costes directos asociados. Métodos: Recogida retrospectiva del consumo de recursos a partir de la historia clínica y la entrevista personal en 29 centros de atención primaria de todo el territorio nacional de una muestra de pacientes seleccionados de forma aleatoria a partir del registro de diabéticos de cada centro. Resultados: Se evaluó a 1.004 pacientes (561 mujeres con una media de edad de 67,42 años y una media de evolución de la enfermedad de 10,07 años. El 50,9% no presentaba complicaciones, el 17,7% sólo macrovasculares, el 19,5% sólo microvasculares y el 11,9% ambas. El coste anual sanitario por paciente fue de 1.305,15 euros. De este coste el 28,6% (373,27 euros estaba relacionado directamente con el control de la diabetes, el 30,51% (398,20 euros con sus complicaciones y el 40,89% (533,68 euros no estaba relacionado. El coste medio de un paciente sin complicaciones fue de 883 euros frente a 1.403 de un paciente con complicaciones microvasculares, 2.022 cuando existían complicaciones macrovasculares y 2.133 cuando coexistían ambos tipos de complicaciones. Conclusiones: El elevado coste del tratamiento de la diabetes tipo 2 y sus complicaciones, sugiere la posibilidad de que la mejora del control de la enfermedad pueda no sólo mejorar la supervivencia y la calidad de vida, sino reducir los costes asociados con las complicaciones crónicas.

  20. Pipe type poles in transmission power lines; Postes tipo tubo en lineas de transmision

    Energy Technology Data Exchange (ETDEWEB)

    Cervantes E, Mario; Becerril A, Armando [Luz y Fuerza del Centro, Mexico, D. F. (Mexico)

    1997-12-31

    The first supports for transmission power lines were relatively small structures, of simple configuration, to save reduced clearances to resist load in accordance with its need; with the technical development, gradually appeared higher and higher electric tensions and greater obstacles to overcome, consequently the design of the supports had to be adapted to the new conditions. This gave rise to the development of a specific technique that would adequate and incorporate the continuous engineering advances. In this document the initial considerations on the design poles pipe type are examined; within these considerations mention is made of: the design, the manufacture, the prototype tests, installation, quality control and foundations. The type tube pole is portrayed, as well as the steel reinforcement, finally the types of precast foundations are shown [Espanol] Los primeros soportes para lineas de transmision fueron estructuras relativamente pequenas, de configuracion simple, para salvar claros reducidos y resistir cargas proporcionales a sus necesidades, con el desarrollo de la tecnica, fueron apareciendo tensiones electricas cada vez mas elevadas y obstaculos mayores que vencer, por lo que el diseno de los soportes tuvo que adaptarse a las nuevas condiciones. Esto dio origen al desenvolvimiento de una tecnica especifica que fuese adecuando e incorporando los continuos avances de la ingenieria. En este documento se tratan las consideraciones iniciales del diseno de los postes tipo tubo; dentro de estas consideraciones se citan: el diseno, la fabricacion, las pruebas de prototipo, montajes, control de calidad y cimentaciones. Se ilustra el poste tipo tubo, al igual que el armado del poste, por ultimo se muestra los tipos de cimentaciones precoladas

  1. CONTROL PREDICTIVO DE UN ROBOT TIPO SCARA PREDICTIVE CONTROL OF A SCARA ROBOT

    Directory of Open Access Journals (Sweden)

    Oscar Andrés Vivas Albán

    2006-08-01

    Full Text Available Este artículo presenta una aplicación eficiente de un control por modelo de referencia sobre un robot de tipo SCARA. El control estudiado es un control predictivo funcional, el que hace uso de un modelo dinámico simplificado del robot. Los ensayos simulados se realizan sobre un robot de cuatro grados de libertad, tipo SCARA. Con el fin de comparar diferentes estrategias de control, se diseña un controlador clásico tipo PID y dos controladores basados en el modelo de referencia. En este último caso el sistema se linealiza y se desacoplada por realimentación, lo que transforma el sistema a controlar en un simple par de integradores. Al sistema lineal y desacoplado resultante se le aplica el control por par calculado y el control predictivo funcional. Los tres controladores estudiados se simulan sobre el robot SCARA con valores numéricos reales. Las pruebas permiten valorar las respuestas de estos controladores en seguimiento de trayectoria, rechazo de perturbaciones y presencia de errores en el modelado con consignas complejas similares a las utilizadas en procesos de fabricación.This paper describes an efficient approach for model based control, applied on a SCARA robot. The studied control is the predictive functional control which uses a simplified dynamical model of the robot. The simulated tests are made on a SCARA type robot, with four DOF. To compare several control strategies, a classical PID control and two model based controllers are designed. In the last case, the model is first linearized and decoupled by feedback, transforming the system into a double set of integrators. Computed torque control and predictive functional control are applied to the linear and decoupled system. The three studied controllers are simulated on the SCARA robot with real numerical values. Tracking performance, disturbance rejection and model robot mismatch are enlightened, using complex machining tasks trajectories and error presence in the modelling

  2. 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.

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

    Science.gov (United States)

    Pan, Chin-Yun; Chou, Szu-Ting; Tseng, Yu-Chuan; Yang, Yi-Hsin; Wu, Chao-Yi; Lan, Ting-Hsun; Liu, Pao-Hsin; Chang, Hong-Po

    2012-12-01

    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/ft(3) 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. Copyright © 2012. Published by Elsevier B.V.

  4. 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.

  5. Anestesia local e sedação para cirurgia de implante coclear: uma alternativa possível Local anesthesia for cochlear implant surgery: a possible alternative

    Directory of Open Access Journals (Sweden)

    Rogério Hamerschmidt

    2010-10-01

    Full Text Available Aanestesia geral sempre foi motivo de dúvida dos pacientes que vão ser submetidos a qualquer cirurgia, especialmente o implante coclear. Como já realizamos as cirurgias otológicas com anestesia local e sedação, julgamos perfeitamente possível a realização da cirurgia do implante coclear também com esse tipo de anestesia, diminuindo os riscos, a morbidade e os custos para o hospital. OBJETIVOS: Estudo prospectivo para demonstrar a técnica anestésica e cirúrgica utilizada em três casos de adultos submetidos ao implante coclear, avaliando a segurança e a eficácia de tal técnica. MATERIAL E MÉTODOS: Foram feitas três cirurgias de implante coclear, duas com implante Cochlear e uma com Med-EL, sem intercorrências transoperatórias, durante a telemetria e no pós-operatório imediato. RESULTADOS: Os três pacientes adultos tiveram alta hospitalar aproximadamente três horas após a cirurgia, deambulando, sem eventos nauseosos, relatando um pós-operatório mais fácil do que esperavam, mesmo no momento da telemetria intraoperatória. CONCLUSÃO: Anestesia local e sedação é uma alternativa para casos selecionados de pacientes para o implante coclear, principalmente naqueles de mais idade ou que apresentem contraindicação para a anestesia geral, os riscos e a morbidade são menores.The aim of this paper is to illustrate the possibility of performing a cochlear implant surgery with local anesthesia and sedation, the anesthetic technique and the advantages of that in comparison to a general anesthesia. AIMS: prospective study demonstrating the possibility of doing cochlear implant surgery under local anesthesia and sedation. MATERIALS AND METHODS: we describe three successful cases operated under local anesthesia, including neural telemetry and the conditions the patient presented after the surgery, with a very good recovery and no complications during and after the procedure. RESULTS: these three surgeries show the possibility of

  6. Cariogenicidade de diferentes tipos de leite : efeito da suplementaçáo com ferro

    OpenAIRE

    Regina Celia Rocha Peres

    2000-01-01

    Resumo: Os objetivos deste trabalho foram avaliar a cariogenicidade de diferentes tipos de leite e o efeito cariostático do ferro, quando suplementado em uma fórmula infantil. O trabalho foi dividido em dois experimentos, utilizando um modelo animal de cárie sujeito a um alto desafio cariogênico. Nos dois experimentos foram utilizadas ratas Wistar spf (specific pathogen free) infectadas com Streptococus sobrínus e posteriormente dessalivadas. No experimento I, sessenta ratas foram divididas a...

  7. Síndrome de Waardenburg tipo 1 en gemelos monocigóticos y su familia

    Directory of Open Access Journals (Sweden)

    Gustavo Andrés Duque

    2016-04-01

    Los hallazgos aquí reportados muestran la variabilidad de las manifestaciones fenotípicas del síndrome de Waardenburg tipo 1 dentro de una familia y especialmente en gemelos monocigóticos, lo que se ha explicado por la expresión variable de genes específicos o por la interacción de ellos con genes modificadores. Cabe resaltar que los gemelos fueron expuestos a alcohol en el primer trimestre del embarazo, por lo cual se propone que la expresión variable del SW fue influenciada por exposiciones a agentes medioambientales.

  8. Atividade física na criança com diabetes tipo 1

    Directory of Open Access Journals (Sweden)

    Cristiane P. Miculis

    2010-08-01

    Full Text Available OBJETIVO: Abordar os aspectos práticos da realização segura de atividade física e esportes em crianças e adolescentes portadores de diabetes tipo 1. FONTES DOS DADOS: A pesquisa dos artigos foi conduzida em fontes de dados nacionais (SciELO e internacionais (PubMed/MEDLINE, assim como nas próprias referências dos artigos encontrados, adotando como limites: artigos publicados nos últimos 10 anos, preferencialmente conduzidos em crianças e adolescentes com diabetes tipo 1, sendo em sua maioria estudos experimentais e meta-análises sobre atividade física. SÍNTESE DOS DADOS: Com o metabolismo aeróbico, os músculos esqueléticos consomem maior quantidade de glicose para gerar energia, o que diminui a gliconeogênese hepática, levando a uma diminuição na glicemia e aumentando o risco de hipoglicemia. A reposição de carboidratos antes, durante e após o exercício em quantidade adequada e a redução da dose de insulina de ação rápida (pré-refeição são os principais aliados da criança e adolescente com diabetes tipo 1 para evitar a ocorrência da hipoglicemia severa. CONCLUSÕES: Para a reposição de carboidratos e a redução da dose de insulina, deve-se considerar o tipo, a duração e a intensidade da atividade física, bem como o horário de sua realização. A participação em diversos esportes, coletivos e individuais, e em atividades físicas de intensidades variadas é possível, sendo muito recomendado no tratamento do diabetes infantil.

  9. Factores de riesgo de enfermedad aterosclerótica en la diabetes mellitus tipo 2

    OpenAIRE

    Socarrás Suárez, María Matilde; Blanco Anesto, Jorge; Vázquez Vigoa, Alfredo; González Hernández, Daris; Licea Puig, Manuel E.

    2003-01-01

    Se realizó un estudio descriptivo de corte transversal a 199 pacientes con diagnóstico de diabetes mellitus tipo 2, para conocer la frecuencia de obesidad, describir hábitos dietéticos y determinar si existe asociación entre obesidad y presencia de factores de riesgo cardiovasculares como hipertensión arterial, dislipidemia, hiperinsulinemia, hábito de fumar, microalbuminuria y antecedentes familiares de primera línea de obesidad. Para el análisis comparativo de las variables continuas entre ...

  10. MHEALTH Y TICS EN LOS CUIDADOS DE LA DIABETES MELLITUS TIPO 1

    OpenAIRE

    Ramos Fernández, Javier

    2017-01-01

    La diabetes mellitus tipo 1 es una enfermedad crónica consistente en un cuadro metabólico caracterizado por hiperglucemia mantenida, provocada por un déficit absoluto de insulina y por lo tanto, es necesaria su administración exógena; Constituye el 10% de los casos de diabetes en la población general, y se da en niños y adolescentes con gran diferencia (95%) 1. Debido a que es una enfermedad crónica, debemos realizar una educación precoz y profunda sobre los hábitos de vida de las personas di...

  11. Jejum alimentar e qualidade da carne de frango de corte tipo caipira

    OpenAIRE

    OLIVEIRA,Felipe Rosa; BOARI,Cleube Andrade; PIRES,Aldrin Vieira; MOGNATO,João Carlos; CARVALHO,Rúbio Madureira de Souza; SANTOS JÚNIOR,Marco Aurélio; MATTIOLI,Cristiano Campos

    2015-01-01

    ResumoObjetivou-se avaliar as características de qualidade da carne de frango de corte tipo caipira em diferentes tempos de jejum alimentar. Aves, machos, da linhagem “pesadão vermelho”, criadas até 85 dias de idade em sistema semiextensivo, foram submetidas aos tempos de zero, três, seis, nove e 12 horas de jejum alimentar. Obteve-se o peso vivo, peso da carcaça, o rendimento de carcaça fria, o peso do trato gastrintestinal das aves. Foram avaliados o pH24h, a luminosidade (L*), ...

  12. Consumo de Café e o Risco de Desenvolver Diabetes Mellitus tipo 2

    OpenAIRE

    Ferreira, Diana Isabel Gomes

    2015-01-01

    A diabetes mellitus tipo 2 é uma doença crónica, que está associada a altas taxas de morbidade e mortalidade prematura. O aumento da indicência desta patologia, muito em parte pelos actuais estilos de vida adoptados, tem levado ao interesse do estudo da DM2. O consumo regular de café tem vindo a ser associado de forma positiva com a DM2 e por ser umas das bebidas mais consumidas na actualidade, leva a uma crescente preocupação em conhecer os seus benefícios e malefícios, desencadeando o in...

  13. Los modelos de equilibrio general estocástico y el tipo de cambio

    OpenAIRE

    Jiménez Martín, Juan Ángel

    2003-01-01

    Una parte muy importante de la investigación en economía financiera inernacional se ha dedicado a explicar el comportamiento del tipo de cambio. A partir de los años 80, Lucas (1978,1982), Helpman y Razin (1979,1982) y Stockman (1980,1983,1987) implementan los modelos de equilibrio dinámicos como herramienta para analizar teóricamente algunos de los problemas más relevantes que se estaban produciendo en los mercados de divisas, sobre todo, los relacionados con los posibles efectos de la polít...

  14. Profilaxis de la hipertensión arterial tipo III con el uso de la aspirina

    OpenAIRE

    Rodríguez Santana, Maricela; García León, Lázaro; Valdés Suárez, Ernesto; Hernández Cabrera, Jesús

    1997-01-01

    Se realiza un estudio, en el período comprendido entre enero de 1994 hasta enero con 1995, de 104 gestantes diagnosticadas como hipertensas crónicas en la consulta externa del hospital docente ginecoobstétrico de Matanzas. Del total de la muestra, 54 fueron tratadas con dosis bajas en aspirina y en 50 no se aplicó este tratamiento. Las gestantes que utilizaron bajas dosis de aspirina, no desarrollaron hipertensión arterial tipo III (HTA III), ni se presentaron en las mismas complicaciones mat...

  15. Síndrome de Mauriac: forma rara do diabetes mellitus tipo 1

    OpenAIRE

    Maia, Frederico F.R.; Araújo, Levimar R.

    2002-01-01

    O diabetes mellitus tipo 1 (DM1) é uma das doenças endócrino-metabólicas mais importantes na faixa etária pediátrica, podendo se manifestar com alterações sistêmicas decorrentes do controle glicêmico inadequado, como hepatomegalia e déficit de crescimento. Apresentamos o caso de uma criança com DM1 descompensado, evoluindo com sinais clínicos e laboratoriais sugestivos de síndrome de Mauriac. Alertamos para a importância do conhecimento dessa forma rara de DM1, buscando orientar e esclarecer ...

  16. ASPECTOS HIGIÊNICO-SANITÁRIOS DE ESTABELECIMENTO COMERCIAL DO TIPO SUPERMERCADO DE GRANDE PORTE.

    OpenAIRE

    Pedroso, Kátia Rejane Pereira de Queiroga; Bernardino, Priscilla Diniz Lima da Silva

    2016-01-01

    RESUMOOs supermercados são locais aonde o consumidor pode encontrar vários produtos indispensáveis ao seu dia-a-dia, principalmente os produtos alimentícios. Este tipo de comércio deve oferecer um serviço de qualidade capaz de assegurar a saúde do consumidor, por meio dos preceitos higiênico- sanitários, conforme a legislação vigente determina. Objetivou-se neste trabalho a avaliação da qualidade dos serviços oferecidos ao consumidor por três supermercados da rede Y, em Cascavel, PR. A metodo...

  17. Detección de virus herpes canino tipo 1 en Chile

    OpenAIRE

    NAVARRO, C; CELEDON, M; PIZARRO, J

    2003-01-01

    RESUMEN Este trabajo informa la detección del virus herpes canino tipo 1 (VHC-1) en nuestro país, confirmando la fuerte sospecha clínica de su existencia. Se logró obtener un aislado viral, denominado RP5, a partir de casos clínicos diagnosticados como enfermedad hemorrágica de los cachorros. Este aislado inoculado en monocapas celulares produce el típico efecto citopático de miembros de la subfamilia alphaherpesvirinae, familia Herpesviridae: lisis celular a tiempos cortos. Este aislado mani...

  18. Fundamentos del tipo de cambio real en Costa Rica (2001-2014)

    OpenAIRE

    Fonseca Hernández, Raúl; Rodríguez Ramos, Nancy; Martínez Arias, Emil

    2017-01-01

    El documento está orientado a profesionales de ciencias sociales con el objetivo de orientarles en la comprensión del comportamiento del Índice de Tipo de Cambio Real de Costa Rica (ITCER) en relación con sus fundamentos. Se utiliza el modelo teórico behavioral equilibrium exchange rate (BEER) para identificar y analizar los efectos en estas variables sobre el ITCER. Los seis indicadores analizados fueron: términos de intercambio, absorción fiscal, IED, tasa de interés real doméstica y produc...

  19. RADIOEMISSÕES SOLARES TIPO II ASSOCIADAS A FLARES E CMES

    Directory of Open Access Journals (Sweden)

    Rafael Douglas Cunha-Silva

    2013-12-01

    Full Text Available Atribuídas a ondas de choque e a ejeções de plasmoide, as emissões solares tipo II são ondaseletromagnéticas geradas a partir de oscilações do plasma coronal. A origem dos choques associados a essasemissões é ainda uma questão em aberto da física solar. Enquanto alguns trabalhos sugerem os flares solarescomo seus acionadores, outros fornecem indícios de serem as ejeções de massa coronal (CMEs sua origemmais provável. Este trabalho apresenta os resultados da análise de duas emissões tipo II, registradas por doisespectrômetros da rede e-CALLISTO (extended-Compound Astronomical Low-cost Low-frequency Instrument forSpectroscopy and Transportable Observatory, os quais operam na faixa de frequências de 45-870 MHz. Oprimeiro evento, observado em 13 de junho de 2010, às 05:38 UT, apresentou uma taxa de deriva em frequênciade -0,2 MHz s-1, correspondente a uma velocidade de choque de 528 km s-1, estando, temporalmente, associadoa uma CME lenta (~320 km s-1 e a um flare solar em raios-X, classe M1.0. O segundo evento, observado em 09de Agosto de 2011, às 08:02 UT, apresentou uma taxa de deriva em frequência de -1,4 MHz s-1, correspondentea uma velocidade de choque de 1375 km s-1, estando, temporalmente, associado a uma CME tipo halo (~1610km s-1 e a um flare solar em raios-X, classe X6.9. Os resultados obtidos, para os parâmetros observacionais dasemissões tipo II e para os parâmetros físicos de suas fontes, são discutidos no contexto de sua relação com seuflares e CMEs associados.

  20. Resultados del recambio valvular pulmonar según el tipo de prótesis implantada

    Directory of Open Access Journals (Sweden)

    María García Vieites

    2017-05-01

    Conclusiones: El RVP en nuestra serie se ha asociado a una baja tasa de mortalidad perioperatoria. Cuando comparamos según el tipo de prótesis, la prótesis Medtronic Freestyle presentó un mayor gradiente inicial y en el grupo Sorin Soprano se observa una degeneración protésica superior a la esperada. Sin embargo, será necesario más seguimiento para definir el comportamiento de la prótesis Carpentier Edwards.

  1. USO DE NATAMICINA NO CONTROLE DO DESENVOLVIMENTO DE FUNGOS EM SALAME TIPO ITALIANO

    OpenAIRE

    Jean Carlos Brustolin

    2009-01-01

    Este trabalho teve como objetivo avaliar o comportamento da natamicina em diferentes concentrações e forma de aplicação no controle do desenvolvimento de bolores e leveduras em salames tipo italiano maturados em salas de maturação de madeira. O acompanhamento foi realizado através de contagem de bolores e leveduras com swabs e acompanhamento fotográfico semanal. Também foi avaliado o efeito da natamicina em relação a aspectos físico químicos como a atividade de água, umidade, gordura e pro...

  2. Alteraciones electrocardiográficas y factores de riesgo cardiovascular en pacientes con diabetes tipo 2

    Directory of Open Access Journals (Sweden)

    Rodríguez-Morán Martha

    1999-01-01

    Full Text Available Objetivo. Determinar cuáles son las alteraciones del ritmo y la conducción cardiaca más frecuentes en pacientes con diabetes tipo 2 sin cardiopatía previa y establecer su asociación con los factores de riesgo cardiovascular. Material y métodos. Se incluyeron pacientes con diabetes tipo 2 sin presencia o antecedentes de cardiopatía. Se determinaron los factores de riesgo cardiovascular, el índice de masa corporal y los niveles séricos de glucosa, colesterol y triglicéridos. Se registró electrocardiograma convencional en reposo. La asociación de las variables en estudio con la ocurrencia de arritmias se calculó con un modelo de análisis multivariado ajustado por sexo. Resultados. Se integraron 199 pacientes: 113 mujeres (56.8% y 86 hombres (43.2%, y se identificó algún tipo de alteración electrocardiográfica en 29.1% de los sujetos. El hemibloqueo fascicular anterior (HFA y el bloqueo completo de rama derecha del Haz de His (BRDHH, constituyeron 75.9% de las alteraciones identificadas. Los pacientes con trastornos del ritmo y la conducción tienen niveles más elevados de colesterol y triglicéridos. La aparición de arritmias se relaciona directamente con el incremento de la edad (r= 0.75, p= 0.01. En el análisis multivariado ajustado por sexo la hipercolesterolemia y la edad se asociaron significativamente con las alteraciones del ritmo y la conducción: RM 1.5, IC95% 1.1-4.6, p< 0.05 y RM 1.3, IC95% 1.0-5.2, p< 0.05, respectivamente. Conclusiones. Las alteraciones del ritmo y la conducción cardiaca más frecuentes en la diabetes tipo 2 son el HFA y el BRDHH; la hipercolesterolemia y la edad son los factores asociados a su presencia.

  3. Tipos de descortesía verbal y emociones en contextos de cultura hispanohablante

    Directory of Open Access Journals (Sweden)

    de Marlangeon Silvia Kaul

    2017-07-01

    Full Text Available El presente estudio, de carácter interpretativo-descriptivo, se ocupa de la relación existente entre el lenguaje verbal, la descortesía y las emociones en contextos de cultura hispanohablante. Se investiga dicha relación para algunos tipos de actos descorteses, correspondientes a tipos de una escala de intensificación de la fuerza de descortesía (Kaul de Marlangeon. 2008, Tipología del comportamiento verbal descortés en español. En A. Briz- Gómez, A. Hidalgo-Navarro, M. Albelda Marco, J. Contreras y N. Hernández Flores (Eds., Cortesía y conversación: de lo escrito a lo oral. Tercer Coloquio Internacional del Programa EDICE, Vol. 3 (pp. 254–266. Valencia/Estocolmo: Universidad de Valencia- Programa EDICE, Kaul de Marlangeon y Alba-Juez. 2012, A typology of verbal impoliteness behaviour for the English and Spanish Cultures. Revista Española de Lingüística Aplicada (RESLA 25, pp. 69–92, y la consiguiente construcción discursiva de las emociones presentes en ellos. A tal fin, se adopta el punto de vista sociocultural de la pragmática, necesario tanto para el análisis del discurso de (descortesía como para el de las emociones intervinientes en los distintos tipos de actos de descortesía, éstos y aquéllas asociados a sus respectivos contextos socioculturales y situacionales. De igual forma, se acoge el punto de vista de la psicología social, especialmente aquél que pone el énfasis en la dependencia contextual de las emociones y las considera como una construcción social. El pertinente corpus de ejemplos ha sido recogido en diferentes contextos de cultura hispanohablante (argentinos, chilenos, españoles, mexicanos, venezolanos, uruguayos que validan una interpretación ingtercultural. Los resultados de la descripción émica muestran que en cada tipo de descortesía considerado concurren complejas experiencias emocionales, sobre todo negativas, activadoras de conductas agresivas y de su grado de intensidad o de

  4. Asociación entre psoriasis y el control de diabetes mellitus tipo 2

    OpenAIRE

    García Montañez, María Andrea

    2014-01-01

    La psoriasis es una enfermedad que se caracteriza por un proceso inflamatorio crónico y exagerado local y sistémico. Se ha encontrado en la literatura una relación entre la psoriasis y el desarrollo de patologías como diabetes mellitus tipo 2 y el mal control de estas patologías, lo cual aumenta la morbimortalidad de estos pacientes. El presente estudio mostró que no se encontró asociación entre psoriasis y el control de la DM2 , y que la variable mas significativa sobre el control es la ad...

  5. Seguimiento a largo plazo de un paciente con raquitismo dependiente de vitamina D tipo I

    OpenAIRE

    Velásquez-Jones, Luis; Medeiros, Mara; Valverde-Rosas, Saúl; Jiménez-Triana, Clímaco; del Moral-Espinosa, Irma; Romo-Vázquez, José Carlos; Franco-Alvarez, Isidro

    2015-01-01

    Introducción: El raquitismo dependiente de vitamina D tipo I es una enfermedad hereditaria rara debida a una mutación en el gen CYP27B1 que codifica la enzima 1α-hidroxilasa. Se caracteriza por la presentación de raquitismo hipocalcémico grave desde la edad de la lactancia debido al déficit de producción del metabolito activo de la vitamina D, la 1α,25-dihidroxivitamina D3. Caso clínico: Presentamos el caso de un paciente con raquitismo diagnosticado a los 11 meses de edad y el seguimiento...

  6. 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.

  7. Electrochemical properties of ion implanted silicon

    International Nuclear Information System (INIS)

    Pham minh Tan.

    1979-11-01

    The electrochemical behaviour of ion implanted silicon in contact with hydrofluoric acid solution was investigated. It was shown that the implanted layer on silicon changes profoundly its electrochemical properties (photopotential, interface impedance, rest potential, corrosion, current-potential behaviour, anodic dissolution of silicon, redox reaction). These changes depend strongly on the implantation parameters such as ion dose, ion energy, thermal treatment and ion mass and are weakly dependent on the chemical nature of the implantation ion. The experimental results were evaluated and interpreted in terms of the semiconductor electrochemical concepts taking into account the interaction of energetic ions with the solid surface. The observed effects are thus attributed to the implantation induced damage of silicon lattice and can be used for profiling of the implanted layer and the electrochemical treatment of the silicon surface. (author)

  8. Early Loaded Single Implant Reinforced Mandibular Overdenture

    Directory of Open Access Journals (Sweden)

    K. Nischal

    2016-01-01

    Full Text Available Rehabilitating atrophied mandible with two-implant supported denture is a common treatment modality for implant retained removable overdenture in mandible. This paper aims to design a treatment modality where single implant reinforced overdenture is fabricated for a severely atrophied mandibular ridge with early loading protocol. Results of studies have shown that a single implant mandibular overdenture significantly increases the satisfaction and quality of life of patients with edentulism. Midline fracture of the prosthesis is the most common complication related to single implant and two-implant retained mandibular overdentures. To manage such complication, a thin metal mesh is used to reinforce the overdenture and also to make the prostheses lighter and cost effective as compared to conventional cast metal framework.

  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. [Fusion implants of carbon fiber reinforced plastic].

    Science.gov (United States)

    Früh, H J; Liebetrau, A; Bertagnoli, R

    2002-05-01

    Carbon fiber reinforced plastics (CFRP) are used in the medical field when high mechanical strength, innovative design, and radiolucency (see spinal fusion implants) are needed. During the manufacturing process of the material CFRP carbon fibers are embedded into a resin matrix. This resin material could be thermoset (e.g., epoxy resin EPN/DDS) or thermoplastic (e.g., PEAK). CFRP is biocompatible, radiolucent, and has higher mechanical capabilities compared to other implant materials. This publication demonstrates the manufacturing process of fusion implants made of a thermoset matrix system using a fiber winding process. The material has been used clinically since 1994 for fusion implants of the cervical and lumbar spine. The results of the fusion systems CORNERSTONE-SR C (cervical) and UNION (lumbar) showed no implant-related complications. New implant systems made of this CFRP material are under investigation and are presented.

  11. A case of peri-implantitis and osteoradionecrosis arising around dental implants placed before radiation therapy

    OpenAIRE

    Teramoto, Yuji; Kurita, Hiroshi; Kamata, Takahiro; Aizawa, Hitoshi; Yoshimura, Nobuhiko; Nishimaki, Humihiro; Takamizawa, Kazunobu

    2016-01-01

    A little is known about the effect of radiotherapy on the dental implants that have previously been osseointegrated and charged. Here, we reported a case of osteoradionecrosis which arose around dental implants placed before radiation therapy.

  12. Long time follow up of implant therapy and treatment of peri-implantitis.

    Science.gov (United States)

    Roos-Jansåker, Ann-Marie

    2007-01-01

    Dental implants have become an often used alternative to replace missing teeth, resulting in an increasing percentage of the adult population with implant supported prosthesis. Although favourable long-term results of implant therapy have been reported, infections occur. Until recently few reports included data on peri-implant infections, possibly underestimating this complication of implant treatment. It is possible that some infections around implants develop slowly and that with time peri-implantitis will be a common complication to implant therapy as an increasing number of patients have had their implants for a long time (>10 years). Data on treatment of peri-implant lesions are scarce leaving the clinician with limited guidance regarding choice of treatment. The aim of this thesis was to study the frequency of implant loss and presence of peri-implant lesions in a group of patients supplied with Brånemark implants 9-14 years ago, and to relate these events to patient and site specific characteristics. Moreover three surgical treatment modalities for peri-implantitis were evaluated. The thesis is based on six studies; Studies I-III included 218 patients and 1057 implants followed for 9-14 years evaluating prevalence of, and factors related to implant loss (Paper I) and prevalence of peri-implant infections and related factors (Paper I-III). Study IV is a review describing different treatment modalities of peri-implant infections. Study V is a prospective cohort study involving 36 patients and 65 implants, evaluating the use of a bone substitute with or without the use of a resorbable membrane. Study VI is a case series with 12 patients and 16 implants, evaluating a bone substitute in combination with a resorbable membrane and submerged healing. This thesis demonstrated that: After 9-14 years the survival rates of dental implants are high (95.7%). Implant loss seems to cluster within patients and are related to periodontitis evidenced as bone loss on

  13. Infective endocarditis and risk of death after cardiac implantable electronic device implantation

    DEFF Research Database (Denmark)

    Özcan, Cengiz; Raunsø, Jakob; Lamberts, Morten

    2017-01-01

    AIMS: To determine the incidence, risk factors, and mortality of infective endocarditis (IE) following implantation of a first-time, permanent, cardiac implantable electronic device (CIED). METHODS AND RESULTS: From Danish nationwide administrative registers (beginning in 1996), we identified all...

  14. 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.

  15. Characterization of diamond amorphized by ion implantation

    International Nuclear Information System (INIS)

    Allen, W.R.; Lee, E.H.

    1992-01-01

    Single crystal diamond has been implanted at 1 MeV with 2 x 10 20 Ar/m 2 . Rutherford backscattering spectrometry in a channeled geometry revealed a broad amorphized region underlying a thin, partially crystalline layer. Raman spectroscopy disclosed modifications in the bonding characteristic of the appearance of non-diamond carbon. The complementary nature of the two analysis techniques is demonstrated. The Knoop hardness of the implanted diamond was reduced by implantation

  16. Modification of metallic corrosion by ion implantation

    International Nuclear Information System (INIS)

    Clayton, C.R.

    1981-01-01

    This review will consider some of the properties of surface alloys, formed by ion implantation, which are effective in modifying corrosion behaviour. Examples will be given of the modification of the corrosion behaviour of pure metals, steels and other engineering alloys, resulting from implantation with metals and metalloids. Emphasis will be given to the modification of anodic processes produced by ion implantation since a review will be given elsewhere in the proceedings concerning the modification of cathodic processes. (orig.)

  17. Relation between bruxism and dental implants

    OpenAIRE

    TORCATO,Leonardo Bueno; ZUIM,Paulo Renato Junqueira; BRANDINI,Daniela Atili; FALCÓN-ANTENUCCI,Rosse Mary

    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...

  18. CEMS of Sb+ implanted stainless steels

    International Nuclear Information System (INIS)

    Roy-Poulsen, H.; Johnson, E.; Johansen, A.; Sarholt-Kristensen, L.; Hayashi, H.

    1986-01-01

    Martensitic transformations have been analyzed in a series of antimony implanted austenitic stainless steels using CEMS. The implanted samples contain about 70 vol% martensite, which is considerably more than can be formed conventionally by plastic deformation of cooling below the martensite start temperature. CEM spectra from implantation induced martensite and from martensite formed in conventional processes are virtually identical. In both cases the hyperfine field is ∼ 25T. (Auth.)

  19. CEMS of Sb+ implanted stainless steels

    International Nuclear Information System (INIS)

    Roy-Poulsen, H.; Copenhagen Univ.; Johnson, E.; Johansen, A.; Sarholt-Kristensen, L.; Hayashi, H.

    1985-01-01

    Martensitic transformations have been analyzed in a series of antimony implanted austenitic stainless steels using CEMS. The implanted samples contain about 70 vol% martensite, which is considerably more than can be formed conventionally by plastic deformation or cooling below the martensite start temperature. CEM spectra from implantation induced martensite and from martensite formed in conventional processes are virtually identical. In both cases the hyperfine field is ∝25 T. (orig.)

  20. Cochlear implant revision surgeries in children.

    Science.gov (United States)

    Amaral, Maria Stella Arantes do; Reis, Ana Cláudia Mirândola B; Massuda, Eduardo T; Hyppolito, Miguel Angelo

    2018-02-16

    The surgery during which the cochlear implant internal device is implanted is not entirely free of risks and may produce problems that will require revision surgeries. To verify the indications for cochlear implantation revision surgery for the cochlear implant internal device, its effectiveness and its correlation with certain variables related to language and hearing. A retrospective study of patients under 18 years submitted to cochlear implant Surgery from 2004 to 2015 in a public hospital in Brazil. Data collected were: age at the time of implantation, gender, etiology of the hearing loss, audiological and oral language characteristics of each patient before and after Cochlear Implant surgery and any need for surgical revision and the reason for it. Two hundred and sixty-five surgeries were performed in 236 patients. Eight patients received a bilateral cochlear implant and 10 patients required revision surgery. Thirty-two surgeries were necessary for these 10 children (1 bilateral cochlear implant), of which 21 were revision surgeries. In 2 children, cochlear implant removal was necessary, without reimplantation, one with cochlear malformation due to incomplete partition type I and another due to trauma. With respect to the cause for revision surgery, of the 8 children who were successfully reimplanted, four had cochlear calcification following meningitis, one followed trauma, one exhibited a facial nerve malformation, one experienced a failure of the cochlear implant internal device and one revision surgery was necessary because the electrode was twisted. The incidence of the cochlear implant revision surgery was 4.23%. The period following the revision surgeries revealed an improvement in the subject's hearing and language performance, indicating that these surgeries are valid in most cases. Copyright © 2018 Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. Published by Elsevier Editora Ltda. All rights reserved.

  1. 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...... at the same procedure in sockets without profound signs of infection. The procedure carries a possible risk of poor motility....

  2. Systemic alendronate treatment improves fixation of press-fit implants: a canine study using nonloaded implants

    DEFF Research Database (Denmark)

    Jensen, Thomas B; Bechtold, Joan E; Chen, Xinqian

    2007-01-01

    of alendronate treatment. Bone ongrowth (bone in contact with implant surface) was estimated using the linear intercept technique and shear strength was calculated as the slope on a load-displacement curve. For the press fit implants, alendronate treatment significantly increased bone ongrowth from 24% to 29...... early implant stability is an important predictor of longevity, systemic alendronate treatment could be an important clinical tool to positively influence the early stages of implant incorporation. Udgivelsesdato: 2007-Jun...

  3. 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

  4. Opciones tipo barrera sobre la tasa de cambio Peso/Dólar

    Directory of Open Access Journals (Sweden)

    Ángela María Pérez Muñoz

    2007-12-01

    Full Text Available Este artículo es derivado de la investigación titulada Opciones tipo barrera sobretasa de cambio. Se realizó un examen de diversas metodologías existentes parala valoración y medición de los riesgos de las opciones tipo barrera europeas. Larevisión se centró, principalmente, en los métodos numéricos. Las SimulacionesMontecarlo constituyen una metodología para valorar y calcular las coberturas deopciones que dependen de la ruta seguida por los precios del activo subyacentedurante su vida útil. Los resultados generados corroboran que ellas convergensatisfactoriamente en la formulación analítica cuando ésta se ajusta a unaobservación discreta de los precios del activo subyacente. Tales resultados seajustan más cuando se aplica el Método de Control de Varianza de Variables Antitéticas a las Simulaciones Montecarlo. 

  5. Tipos de tiempo para el turismo de sol y playa en el litoral alicantino

    Directory of Open Access Journals (Sweden)

    Martínez Ibarra, Emilio

    2008-06-01

    Full Text Available In this article the author proposes a series of weather types, with the purpose of evaluating the climatic-tourist potencial for the tourism of sun and beach in the coast of Alicante. The method, analysis of the frequency of the density of use of the practice the suntan and swin, the type of consulted source (webcam images, as well as the diversity of distinguished types, make of this work a novel contribution, in a branch of the knowledge relatively little cultivated although emergent: the Tourist Climatology.

    En el presente trabajo se proponen una serie de tipos de tiempo, con la finalidad de evaluar el potencial climático-turístico para el turismo de sol y playa en el litoral alicantino. El método, análisis de la frecuentación de la densidad de uso de la práctica del bronceado y baño, el medio a partir del cual se ha obtenido la información (imágenes webcam, así como la diversidad de tipos distinguidos, hacen de este trabajo una aportación novedosa, en una rama del conocimiento relativamente poco cultivada aunque emergente: la Climatología Turística.

  6. Diabetes tipo 2 en niños: Reporte de caso

    Directory of Open Access Journals (Sweden)

    Miguel Pinto

    2010-04-01

    Full Text Available Se reporta el caso de una niña de 14 años con antecedentes de obesidad, dislipidemia y diabetes que es referida a nuestro servicio por polidipsia, poliuria y sobrepeso. La paciente tenía el antecedente familiar de ambos padres con diagnóstico de diabetes tipo 2. El examen físico mostró obesidad central y acantosis nigricans severa en los pliegues cutáneos. Los análisis de laboratorio mostraron hiperglicemia, hiperinsulinemia y péptido C normal. Los autoanticuerpos anti-GAD y anti-ICA fueron negativos. El tratamiento con metformina fue continuado; y la dieta y actividad física fueron reforzadas. Actualmente, los niveles de hemoglobina glicosilada y glicemia en ayunas han mejorado. El incremento en la obesidad infantil ha resultado en un marcado aumento en la incidencia de síndrome metabólico y diabetes tipo 2 en la población infantil.(Rev Med Hered 2010;21:103-106.

  7. Cuotas de género y tipo de lista en América Latina

    Directory of Open Access Journals (Sweden)

    Nélida Archenti

    2007-06-01

    Full Text Available Las reformas electorales llevadas a cabo en algunos países de América Latina, a partir de los '90, han producido resultados cuyo análisis es ineludible para la comprensión del acceso de las mujeres a los cargos electivos. En la actualidad, no existe un consenso respecto a cómo afectan los elementos del sistema electoral a la participación política femenina bajo las leyes de cuotas, en particular en lo referente al tipo de lista (bloqueada o desbloqueada y la magnitud de distrito. Este artículo intenta, a través del análisis de los resultados electorales de esas provincias, aportar nuevos elementos empíricos al debate sobre los efectos del tipo de lista en el acceso de las mujeres a los legislativos, en sistemas con cuotas de género.The electoral reforms implemented in some Latin American countries at the 90's have had a strong impact over the women access to elected positions, although there is not a consensus about the electoral systems ' components that affect the women participation in politics through especific electoral laws. This article analyses the effects of electoral mechanisms on women's participation in politics in some municiaplities in Argentina.

  8. MULHER, UMA CONSTRUÇÃO SOCIAL: REPRESENTAÇÕES, ESTEREÓTIPOS E IMAGENS

    Directory of Open Access Journals (Sweden)

    Rosana Rocha Siqueira

    2014-06-01

    Full Text Available O presente artigo tem como objetivo uma revisita a referenciais bibliográficos a partir dos quais foi possível refletir sobre a construção de estereótipos relacionados à imagem feminina no século XX partindo-se do conceito de representação proposto por Moscovici (2003. Pretende-se na convergência destas duas categorias (representação e imagem apresentar olhares sobre a construção de alguns estereótipos relacionados às mulheres, uma vez que diversas instituições inclusive o próprio movimento feminista em suas variadas vertentes também preocuparam-se em “criar” representações das mulheres. Algumas discussões presentes neste artigo fizeram parte do conteúdo da disciplina “Seminários avançados sobre produtos, processos e discursos midiáticos” ofertada pelo Núcleo de Pós-Graduação da Universidade Federal de Sergipe. Desta forma pode-se refletir sobre os variados recortes imagéticos dos quais as instituições e as próprias mulheres utilizaram-se para compor novas representações.

  9. Avaliação química de fertilizantes com micronutrientes tipo fritas

    Directory of Open Access Journals (Sweden)

    F. Vale

    2003-02-01

    Full Text Available O objetivo deste trabalho foi analisar fertilizantes tipo fritas comercializados no Brasil, utilizando o método prescrito para análise de fertilizantes minerais não-fritas, o que normalmente tem sido feito na rotina pelos laboratórios de análises de fertilizantes. Também foram analisados os teores de Cd, Ni e Pb nesses fertilizantes. Observou-se que o método utilizado foi adequado para a análise dos fertilizantes tipo fritas, o que indica que as fritas comercializadas no Brasil não são realmente fritas, isto é, silicatos fundidos com micronutrientes. A presença de micronutrientes metálicos nos produtos sem as respectivas garantias e a alta concentração de metais indesejáveis, principalmente Pb, são fortes indícios de utilização de resíduos industriais na fabricação desses fertilizantes. Sugere-se que sejam estudados e propostos extratores químicos para avaliar a eficiência agrícola desses produtos.

  10. Tipos de fraudes en carnes y productos cárnicos: una revisión

    Directory of Open Access Journals (Sweden)

    T. Espinoza

    2015-01-01

    Full Text Available En años recientes la importancia del control de alimentos, en cuanto a la identificación de sus componentes para evitar fraudes, ha crecido tanto en interés en las organizaciones estatales como en las empresas y en las industrias. La globalización, el aumento de las importaciones y exportaciones, y los tratados de libre comercio han propiciado un mayor intercambio y acceso de los alimentos a nivel mundial; junto con ello los problemas asociados a los fraudes tales como la adulteración, sustitución, la intencionalidad, y falsificación se han incrementado. Por ello, se han reportado varios trabajos asociados al fraude alimentario, donde en la mayoría de ellas se muestran aplicaciones de nuevas técnicas de identificación. Sin embargo, una discusión acerca de los tipos de fraude y su impacto sobre la sociedad, el bioterrorismo y la religión, ha sido poco abordada. Esta revisión se enfoca básicamente en describir los tipos de fraude en alimentos más comunes. Así como, se mencionan las recientes técnicas disponibles para detectar una adulteración en carnes.

  11. Fundamentos del tipo de cambio real en Costa Rica (2001-2014

    Directory of Open Access Journals (Sweden)

    Raúl Fonseca Hernández

    2017-05-01

    Full Text Available El documento está orientado a profesionales de ciencias sociales con el objetivo de orientarles en la comprensión del comportamiento del Índice de Tipo de Cambio Real de Costa Rica (ITCER en relación con sus fundamentos. Se utiliza el modelo teórico behavioral equilibrium exchange rate (BEER para identificar y analizar los efectos en estas variables sobre el ITCER. Los seis indicadores analizados fueron: términos de intercambio, absorción fiscal, IED, tasa de interés real doméstica y productividad relativa de la economía. Estos explican adecuadamente el comportamiento del tipo de cambio real, pese a presentar una gran variabilidad. Se identifican claramente dos periodos en el comportamiento del ITCER: el primero (2001 y 2005, se presenta un periodo de depreciación, observándose posteriormente (2006 y 2014 un marcado proceso de apreciación en términos reales del colón costarricense.

  12. Armazenamento refrigerado de beterraba minimamente processada em diferentes tipos de corte

    Directory of Open Access Journals (Sweden)

    Kluge Ricardo Alfredo

    2006-01-01

    Full Text Available Beterrabas minimamente processadas apresentam vida de prateira curta, mesmo sob refrigeração, devido à descoloração superficial que deprecia a qualidade do produto. O objetivo do trabalho foi verificar o efeito de três tipos de corte em beterraba minimamente avaliando sua qualidade durante a conservação refrigerada. Os cortes utilizados foram: fatia, cubo e retalho. Após o processamento as beterrabas foram armazenadas a 5degreesC e as avaliações sendo realizadas durante dez dias a cada dois dias. Beterrabas em fatias apresentaram maior respiração e maiores perdas dos pigmentos betalaínas e de sólidos solúveis durante o armazenamento. Através de análise sensorial, verificou-se que a qualidade visual do produto foi mantida por até quatro dias, independente do tipo de corte. O fator que mais depreciou a qualidade de beterraba minimamente processada foi a perda de coloração das raízes (esbranquiçamento. Pode-se concluir que a beterraba minimamente processada em fatias ou cubo apresenta conservação de, no máximo 4 dias, a 5degreesC, enquanto minimamente processada em retalho apresenta 6 dias de conservação.

  13. Fenótipos clínicos de asma grave Clinical phenotypes of severe asthma

    Directory of Open Access Journals (Sweden)

    Roseliane de Souza Araújo Alves

    2008-09-01

    Full Text Available OBJETIVO: Estabelecer os fenótipos clínicos em portadores de asma grave. MÉTODOS: Foram estudados, retrospectivamente, 111 pacientes em um ambulatório especializado. Os pacientes foram avaliados e acompanhados de maneira sistemática, estabelecendo-se ao final do acompanhamento a adesão e o controle ou não da doença por dados clínicos e funcionais. A resistência ao tratamento foi definida como o não preenchimento, ao final do acompanhamento, por pelo menos seis meses, dos critérios de controle de asma, apesar do uso correto e adesão à medicação. Os fenótipos foram determinados por análise fatorial e comparados por testes diversos. RESULTADOS: Ao final, 88 pacientes foram considerados aderentes e 23 não aderentes. Por análise fatorial do grupo aderente, quatro fenótipos foram determinados: o fenótipo 1 (28 pacientes, formado pelos pacientes resistentes ao tratamento, com maior freqüência de sintomas noturnos, maior número de exacerbações e uso mais freqüente de broncodilatador de resgate; o fenótipo 2 (48 pacientes, formado pelos pacientes com obstrução persistente, com menores valores de relação volume expiratório forçado no primeiro segundo/capacidade vital forçada na avaliação inicial, idade mais avançada e maior tempo de doença; o fenótipo 3 (42 pacientes, representa os pacientes com rinossinusite alérgica, sendo constituído de não fumantes com obstrução predominantemente reversível; e o fenótipo 4 (15 pacientes, formado por casos com história de intolerância à aspirina associado à asma quase fatal. CONCLUSÕES: Um número significativo de portadores de ama grave não adere ao tratamento. Muitos pacientes com asma grave têm obstrução irreversível, mas o fenótipo clínico mais relevante é constituído pelos pacientes resistentes ao tratamento habitual.OBJECTIVE: To characterize clinical phenotypes of severe asthma. METHODS: A total of 111 patients were retrospectively evaluated at a

  14. Neurofibromatosis tipo 2: La historia de Lidia Neurofibromatosis type 2: Life story of Lidia

    Directory of Open Access Journals (Sweden)

    Ares Solanes

    2012-06-01

    Full Text Available La Neurofibromatosis tipo 2 (NF2 es una enfermedad minoritaria hereditaria caracterizada por la presentación progresiva de múltiples tumores, especialmente Schwanomas Vestibulares Bilaterales, a partir de la segunda década de vida. Su tratamiento con cirugía o radioterapia no evita la pérdida de audición. El pronóstico es complicado y los pacientes deben enfrentarse al progresivo deterioro de su calidad de vida. Un estudio cualitativo a través de la historia de vida de nuestra informante clave nos permite explorar y comprender su vivencia, afecta de Neurofibromatosis tipo II (NF2, así como conocer sus necesidades y aprender de sus recursos adaptativos.Neurofibromatosis type 2 (NF2 is a minority hereditary disease characterized by the development of multiple tumours, especially bilateral vestibular schwannomas, in young adults. Treatments with surgery or radiotherapy are performed to delay hearing loss. The prognosis is complicated and patients face the deterioration of their quality of life. A qualitative study through our key subject's life allows us to explore and understand her experience, as a NF2 sufferer, to identify her needs and to learn about her adaptive measures.

  15. El polimorfismo (CAGn del gen ATXN2, nuevo marcador de susceptibilidad para diabetes mellitus tipo 2

    Directory of Open Access Journals (Sweden)

    Luis J. Flores-Alvarado

    Full Text Available RESUMEN Objetivo Estimar si hay asociación del repetido (CAGn del gen ATXN2 en población mexicana con diabetes mellitus (DM tipo 2. Métodos Estudio epidemiológico de casos y controles. Se incluyeron personas sanas y personas diabéticas. La detección de la expansión (CAGn se realizó por reacción en cadena de la polimerasa (PCR-punto final. Los productos de PCR se analizaron mediante electroforesis (PAGE al 8% y tinción con nitrato de plata. Resultados La distribución de alelos del trinucleótido (CAGn en la población analizada resultó similar a la reportada en el centro del país. El alelo más frecuente es el de 22 repetidos; sin embargo, hay asociación con los portadores de los repetidos largos dentro del rango normal con diabetes. Conclusiones Los resultados sugieren que el repetido (CAGn del gen de ATXN2 podría ser un factor causal de DM tipo 2.

  16. Trends in prosthetic biomaterials in implant dentistry

    Directory of Open Access Journals (Sweden)

    Saranjit Singh Bhasin

    2015-01-01

    Full Text Available The most important criterion for the success of dental implants is the selection of a suitable implant biomaterial. To improve the biologic performance of an implant, it is necessary to select a material that does not elicit any negative biological response and at the same time maintains adequate function. It is mandatory for a dentist to have a comprehensive knowledge of various biomaterials used for dental implants. The material of choice for fabrication of the dental implant till date is titanium. With the advancements in the field of implants, zirconia seems to be propitious in the future. However, more advanced in vitro and in vivo studies are required before reaching any such conclusion. To increase the success of zirconia implants, care should be taken to reduce the incidence of mechanical failures. Such failures can be taken care of by having a thorough technical knowledge of implant designing and manufacturing defects. This article attempts to compare the advantages and disadvantages of various dental implant biomaterials. Focus is placed on the recent advances in this field with the recently introduced zirconia and its comparison to conventional titanium.

  17. He implantation induced nanovoids in crystalline Si

    International Nuclear Information System (INIS)

    Kilpelaeinen, S.; Kuitunen, K.; Slotte, J.; Tuomisto, F.; Bruno, E.; Mirabella, S.; Priolo, F.

    2009-01-01

    Positron annihilation spectroscopy (PAS) in Doppler broadening mode was used to study the vacancy profile of crystalline Si after He and B implantation and subsequent annealing. In the He-implanted samples two different void layers were observed, one consisting of large voids at the projected range of He and another containing 'nanovoids' slightly larger than divacancies at roughly halfway between R p of He and the surface. The nanovoid layer was shown to be absent from samples co-implanted with B, implying that interstitials created during B implantation get trapped in the nanovoids and fill them, thus hindering interstitial-mediated B diffusion.

  18. Ion implantation of boron in germanium

    International Nuclear Information System (INIS)

    Jones, K.S.

    1985-05-01

    Ion implantation of 11 B + into room temperature Ge samples leads to a p-type layer prior to any post implant annealing steps. Variable temperature Hall measurements and deep level transient spectroscopy experiments indicate that room temperature implantation of 11 B + into Ge results in 100% of the boron ions being electrically active as shallow acceptor, over the entire dose range (5 x 10 11 /cm 2 to 1 x 10 14 /cm 2 ) and energy range (25 keV to 100 keV) investigated, without any post implant annealing. The concentration of damage related acceptor centers is only 10% of the boron related, shallow acceptor center concentration for low energy implants (25 keV), but becomes dominant at high energies (100 keV) and low doses ( 12 /cm 2 ). Three damage related hole traps are produced by ion implantation of 11 B + . Two of these hole traps have also been observed in γ-irradiated Ge and may be oxygen-vacancy related defects, while the third trap may be divacancy related. All three traps anneal out at low temperatures ( 0 C). Boron, from room temperature implantation of BF 2 + into Ge, is not substitutionally active prior to a post implant annealing step of 250 0 C for 30 minutes. After annealing additional shallow acceptors are observed in BF 2 + implanted samples which may be due to fluorine or flourine related complexes which are electrically active

  19. Endothelial cell adhesion to ion implanted polymers

    Energy Technology Data Exchange (ETDEWEB)

    Suzuki, Y; Kusakabe, M [SONY Corp., Tokyo (Japan); Lee, J S; Kaibara, M; Iwaki, M; Sasabe, H [RIKEN (Inst. of Physical and Chemical Research), Saitama (Japan)

    1992-03-01

    The biocompatibility of ion implanted polymers has been studied by means of adhesion measurements of bovine aorta endothelial cells in vitro. The specimens used were polystyrene (PS) and segmented polyurethane (SPU). Na{sup +}, N{sub 2}{sup +}, O{sub 2}{sup +} and Kr{sup +} ion implantations were performed at an energy of 150 keV with fluences ranging from 1x10{sup 15} to 3x10{sup 17} ions/cm{sup 2} at room temperature. The chemical and physical structures of ion-implanted polymers have been investigated in order to analyze their tissue compatibility such as improvement of endothelial cell adhesion. The ion implanted SPU have been found to exhibit remarkably higher adhesion and spreading of endothelial cells than unimplanted specimens. By contrast, ion implanted PS demonstrated a little improvement of adhesion of cells in this assay. Results of FT-IR-ATR showed that ion implantation broke the original chemical bond to form new radicals such as OH, ....C=O, SiH and condensed rings. The results of Raman spectroscopy showed that ion implantation always produced a peak near 1500 cm{sup -1}, which indicated that these ion implanted PS and SPU had the same carbon structure. This structure is considered to bring the dramatic increase in the extent of cell adhesion and spreading to these ion implanted PS and SPU. (orig.).

  20. Prevention and management of cochlear implant infections.

    Science.gov (United States)

    Gluth, Michael B; Singh, Rajesh; Atlas, Marcus D

    2011-11-01

    Understanding the issues of infection related to an implantable medical device is crucial to all cochlear implant teams. Furthermore, given the risk of central nervous system complications and the relatively high quantity of underlying resource investment associated with cochlear implantation, the stakes of infection are high. The optimal strategies to prevent and manage such infections are still evolving as good-quality prospective data to guide such management decisions are not yet abundant within the medical literature and many recommendations are based on retrospective reviews or anecdotal evidence. We will outline a general strategy to deal with cochlear implant-related infection based on both the authors' experience and the published literature.

  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. High energy ion implantation for IC processing

    International Nuclear Information System (INIS)

    Oosterhoff, S.

    1986-01-01

    In this thesis the results of fundamental research on high energy ion implantation in silicon are presented and discussed. The implantations have been carried out with the 500 kV HVEE ion implantation machine, that was acquired in 1981 by the IC technology and Electronics group at Twente University of Technology. The damage and anneal behaviour of 1 MeV boron implantations to a dose of 10 13 /cm 2 have been investigated as a function of anneal temperature by sheet resistance, Hall and noise measurements. (Auth.)

  3. High energy P implants in silicon

    International Nuclear Information System (INIS)

    Raineri, V.; Cacciato, A.; Benyaich, F.; Priolo, F.; Rimini, E.; Galvagno, G.; Capizzi, S.

    1992-01-01

    Phosphorus ions in the energy range 0.25-1 MeV and in the dose range 2x10 13 -1x10 15 P/cm 2 were implanted into (100) Si single crystal at different tilt angles. In particular channeling and random conditions were investigated. For comparison some implants were performed on samples with a 2 μm thick surface amorphous layer. Chemical concentration P profiles were obtained by secondary ion mass spectrometry. Carrier concentration and mobility profile measurements were carried out by sheet resistance and Hall measurements on implanted van der Pauw patterns. Carrier concentration profiles were also obtained by spreading resistance (SR) measurements. The damage in the as-implanted samples was determined by backscattering and channeling spectrometry (RBS) as a function of the dose and implantation energy. Comparison of random implants in crystal with implants in amorphous layers shows that in the first case it is impossible to completely avoid the channeling tail. In the implants performed under channeling conditions at low doses the P profiles are flat over more than 2 μm thick layers. Furthermore, by increasing the implanted dose, the shape of the profiles dramatically changes due to the dechanneling caused by the crystal disorder. The data are discussed and compared with Monte Carlo simulations using the MARLOWE code. A simple description of the electronic energy loss provides an excellent agreement between the calculated and experimental profiles. (orig.)

  4. Helium implantation effects in SAP and aluminum

    International Nuclear Information System (INIS)

    Bauer, W.; Thomas, G.J.

    1976-02-01

    A series of 300 keV He implantations of Al and SAP 930 have been conducted at temperatures between 150 and 773K. The He re-emission was monitored during implantation and the samples were examined with a scanning electron microscope after implantation. Both Al and SAP 930 were found to blister after a critical He dose was reached at temperatures above 473K, both underwent flaking below that temperature, with blistering re-appearing in SAP 930 at an implantation temperature of 150K. The surface deformation and He re-emission are strongly dependent on microstructural effects in the intermediate temperature regime

  5. Determining factors for implant referral rates.

    Science.gov (United States)

    Levin, Roger P

    2002-01-01

    The research findings indicate that the field of implant dentistry will only grow at a moderately low level unless certain changes are made. Findings indicated that the effort by the implant companies has been nothing short of dramatic, and yet almost 60% of restorative doctors do not participate annually in any implant case. There was no clear indication that younger restorative doctors will significantly increase the number of implant referrals, as their overall implant education has not dramatically differed from those dentists who graduated in earlier years. Once the research was completed, it became obvious to Levin Group that the driving force behind implant referral growth will be implant surgeons, because of their one-to-one relationship with restorative doctors. The Levin Group Implant Management and Marketing Consulting Program is based on approaching restorative doctors in several different levels, starting with awareness all the way through to case facilitation and long-term tracking and communication. Finally, a continuing marketing/education effort needs to be consistently in place with effective materials, not only to create a high level of awareness, but also to motivate restorative doctors to refer cases and then work through the case with the implant surgeon to a satisfactory completion for the restorative doctor, implant surgeon, and patient. While the surgical insertion of implants may seem to carry a high-profit margin relative to the restoration of implants, the truth is that the restoration of implants usually provides a 40% higher profit margin for the restorative doctor than traditional dental services. One of the key issues is that referring doctors have not necessarily learned how to set fees and present cases with regard to implant dentistry. The key factor here is to ensure that the patient understands that implant services involve higher fees than traditional services, because of the necessarily higher levels of experience, education

  6. Treatment planning of implants in posterior quadrants.

    Science.gov (United States)

    Jivraj, S; Chee, W

    2006-07-08

    Differences in anatomy and biomechanics make treatment of posterior quadrants with dental implants substantially different to that of anterior areas. Without implants, when posterior teeth were lost, treatment options included a long span fixed partial denture or a removable prosthesis, especially when no terminal abutment was available. Today, with the use of implants, options are available that allow preservation of unrestored teeth.(1) When teeth are missing, implant supported restorations can be considered the treatment of choice from the perspective of occlusal support, preservation of adjacent teeth and avoidance of a removable partial denture.

  7. Mandibular implant-supported overdentures: Prosthetic overview

    Directory of Open Access Journals (Sweden)

    Fahad A Al-Harbi

    2018-01-01

    Full Text Available Implant-supported overdentures are becoming the treatment of choice for the completely edentulous mandible. They significantly improve the quality of life in edentulous patients. For this review article, the literature was searched to identify pertinent studies. No meta-analysis was conducted because of high heterogeneity within the literature. Accordingly, in this review article, the author provides an update on implant-supported mandible overdentures with regard to the number of implants, type of loading, stress–strain distribution, mode of implant-to-denture attachment, occlusal considerations and complications.

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

    NARCIS (Netherlands)

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

    2017-01-01

    BACKGROUND: 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

  9. A 5-year randomized trial to compare 1 or 2 implants for implant overdentures.

    Science.gov (United States)

    Bryant, S R; Walton, J N; MacEntee, M I

    2015-01-01

    The hypothesis of this 5-y randomized clinical trial was that there would be no significant difference in the satisfaction of edentulous participants with removable complete overdentures attached to 1 or 2 mandibular implants. Secondary aims were to test changes in satisfaction between and within the groups from baseline to 5 y and differences between the groups in implant survival and prosthodontic maintenance over 5 y. Each of the 86 participants (mean age, 67 y) was randomly allocated to receive either 1 implant in the midline (group 1) or 2 implants in the canine areas (group 2) attached to a mandibular overdenture opposing a maxillary complete denture. Satisfaction was self-assessed by participants on a visual analog scale at baseline prior to implants, as well as at 2 mo and 1, 3, and 5 y with implant overdentures, whereas implant survival and prosthodontic maintenance were assessed by clinical examination. After 5 y, 29 participants in group 1 and 33 in group 2 were available, with most dropouts due to death. Satisfaction with the implant denture after 5 y was significantly (P overdentures retained by 1 implant or 2 implants. Additional research is required to confirm long-term treatment effectiveness of single-implant dentures and the implications of prosthetic maintenance with implant overdentures (ClinicalTrials.gov: NCT02117856). © International & American Associations for Dental Research 2014.

  10. 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.

  11. [Researches on biomechanics of micro-implant-bone interface and optimum design of micro implant's neck].

    Science.gov (United States)

    Deng, Feng; Zhang, Lei; Zhang, Yi; Song, Jin-lin; Fan, Yuboa

    2007-07-01

    To compare and analyze the stress distribution at the micro-implant-bone interface based on the different micro-implant-bone conditioned under orthodontic load, and to optimize the design of micro implant's neck. An adult skull with all tooth was scanned by spiral CT, and the data were imported into computer for three-dimensional reconstruction with software Mimics 9.0. The three dimensional finite element models of three micro-implant-bone interfaces(initial stability, full osseointegration and fibrous integration) were analyzed by finite element analysis software ABAQUS6.5. The primary stress distributions of different micro-implant-bone conditions were evaluated when 2N force was loaded. Then the diameter less than 1.5 mm of the micro implant's neck was added with 0.2 mm, to compare the stress distribution of the modified micro-implant-bone interface with traditional type. The stress mostly concentrated on the neck of micro implant and the full osseointegration interface in all models showed the lowest strain level. Compared with the traditional type, the increasing diameter neck of the micro implant obviously decreased the stress level in all the three conditions. The micro-implant-bone interface and the diameter of micro implant's neck both are the important influence factors to the stress distribution of micro implant.

  12. 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

  13. 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

  14. 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

  15. Avaliação do crescimento quantitativo de osteoblastos sobre diferentes tipos de superfícies

    OpenAIRE

    Araújo, Maria Angélica Rehder de

    2006-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em Odontologia. O objetivo deste trabalho foi avaliar o crescimento quantitativo de linhagens celulares osteoblásticas oriundas da calvária de rato sobre 3 diferentes superfícies de implantes testando uma metodologia inédita de cultura de células diretamente sobre a superfícies dos implantes : Grupo I, implantes usinados, Grupo II, implantes com textura produzida por ata...

  16. CT evaluation of preoperative cochlear implantation cochlear implantation

    International Nuclear Information System (INIS)

    Tan Xiuzhong; Zhong Lansheng; Lan Bowen; Huang Yaosheng; Du Baowen; Zhu Jian

    2004-01-01

    Objective: To evaluate CT scan as a preoperative evaluation for cochlear implantation candidates. Methods: Axial high-resolution temporal bone CT and three-dimensional reconstruction of inner ear were performed in 93 patients with sensorineural hearing loss. results: Among 81 patients with congenital sensorineural deafness, Mondini malformation was seen in 7 case (13 ears); large vestibular aqueduct syndrome (LVAS) was revealed in 5 cases (8 ears); and inner ear ossification was found in 1 case (2 ears). In 1 case (2 ears) of inner ear fibrosis, reduced cochlear signal was noted on MRI but no unremarkable findings was shown on CT scan, however, in the operation, the device could not inserted into the basal circle of the cochlea, due to fibrous obliteration. In 12 patients with post-speech deafness, chronic suppurative tympanitis was seen in 2 cases (4 ears), and inner ear ossification was revealed in 1 case (2 ears). Conclusion: CT plays an indispensable role in the pre-operative evaluation of cochlear implantation. T 2 -weighted FSE-MRI of the inner ear is a useful complementary to CT scan. (authors)

  17. Búsqueda de recursos en redes peer-to-peer totalmente descentralizadas basada en redes neuronales artificiales

    OpenAIRE

    Corbalán, Leonardo César

    2014-01-01

    Las redes Peer-to-Peer (P2P) puras no estructuradas como Gnutella, dónde los nodos se conectan entre sí como pares o iguales, sin roles diferenciados ni jerarquías de ninguna clase, son sistemas distribuidos, dinámicos, sin punto alguno de centralización, que favorecen la robustez y tolerancia a fallos. Sin embargo, la búsqueda de recursos en estos sistemas constituye un problema esencial. El algoritmo de búsqueda BFS de Gnutella genera gran cantidad de tráfico dificultando su escalabilidad. ...

  18. Forming controlled inset regions by ion implantation and laser bombardment

    International Nuclear Information System (INIS)

    Gibbons, J.F.

    1981-01-01

    A semiconductor integrated circuit structure in which the inset regions are ion implanted and laser annealed to maintain substantially the dimensions of the implantation and the method of forming inset implanted regions having controlled dimensions

  19. Effects of elevated ambient temperature on embryo implantation in rats

    African Journals Online (AJOL)

    Yomi

    2012-03-22

    Mar 22, 2012 ... ambient temperature leads to a delayed implantation and reduced number of implantation sites in. Sprague ... rates decrease after exposure to stress. One of the ..... implantation initiation time, support the previous findings.

  20. Positron implantation profile in kapton

    International Nuclear Information System (INIS)

    Plotkowski, K.; Panek, T.J.; Kansj, J.

    1988-01-01

    Measurements of positrons' implantation profile were made with geometry as in the majority of PAT experiments, making use of the difference in values of mean lifetimes of positrons in the absorber and in the detector. The function describing the absorption of positrons in the absorber taking into account measurement geometry was fitted to the experimental data. The correction to the exponential relation occurring in this function is the dominating factor for small thicknesses of the absorber. In this analysis various values of positrons' backscatter coefficients of the nickel and of the kapton were also taken into account

  1. 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.

  2. Fracture dynamics in implanted silicon

    Energy Technology Data Exchange (ETDEWEB)

    Massy, D.; Tardif, S.; Penot, J. D.; Ragani, J.; Rieutord, F. [Univ. Grenoble Alpes, F-38000 Grenoble (France); CEA, INAC-SP2M, F-38000 Grenoble (France); Mazen, F.; Madeira, F. [Univ. Grenoble Alpes, F-38000 Grenoble (France); CEA, LETI, MINATEC Campus, F-38054 Grenoble (France); Landru, D.; Kononchuk, O. [SOITEC, Parc Technologique des Fontaines, 38190 Bernin (France)

    2015-08-31

    Crack propagation in implanted silicon for thin layer transfer is experimentally studied. The crack propagation velocity as a function of split temperature is measured using a designed optical setup. Interferometric measurement of the gap opening is performed dynamically and shows an oscillatory crack “wake” with a typical wavelength in the centimetre range. The dynamics of this motion is modelled using beam elasticity and thermodynamics. The modelling demonstrates the key role of external atmospheric pressure during crack propagation. A quantification of the amount of gas trapped inside pre-existing microcracks and released during the fracture is made possible, with results consistent with previous studies.

  3. Amorphisation during elevated temperature implantation

    International Nuclear Information System (INIS)

    Carter, G.; Nobes, M.J.; Elliman, R.G.

    1994-01-01

    Transition state theory is employed to predict the rates of amorphous zone recrystallization by direct thermal and radiation mediated thermal annealing processes. These rates are functions of zone radius and are employed to describe the competition between amorphous zone generation and annealing during elevated temperature heavy ion implantation of, particularly, Si and the accumulation of amorphousness with increasing ion fluence. This analysis predicts a change from monotonic to sigmoidal to biexponential accumulation functions with increasing annealing rate or substrate temperature in agreement with experiments. A logarithmic dependence of ion flux density upon substrate temperature for the achievement of defined fractional amorphisation is predicted and is also in agreement with the experiment. (author)

  4. Sacroiliac joint stability: Finite element analysis of implant number, orientation, and superior implant length.

    Science.gov (United States)

    Lindsey, Derek P; Kiapour, Ali; Yerby, Scott A; Goel, Vijay K

    2018-03-18

    To analyze how various implants placement variables affect sacroiliac (SI) joint range of motion. An experimentally validated finite element model of the lumbar spine and pelvis was used to simulate a fusion of the SI joint using various placement configurations of triangular implants (iFuse Implant System ® ). Placement configurations were varied by changing implant orientation, superior implant length, and number of implants. The range of motion of the SI joint was calculated using a constant moment of 10 N-m with a follower load of 400 N. The changes in motion were compared between the treatment groups to assess how the different variables affected the overall motion of the SI joint. Transarticular placement of 3 implants with superior implants that end in the middle of the sacrum resulted in the greatest reduction in range of motion (flexion/extension = 73%, lateral bending = 42%, axial rotation = 72%). The range of motions of the SI joints were reduced with use of transarticular orientation (9%-18%) when compared with an inline orientation. The use of a superior implant that ended mid-sacrum resulted in median reductions of (8%-14%) when compared with a superior implant that ended in the middle of the ala. Reducing the number of implants, resulted in increased SI joint range of motions for the 1 and 2 implant models of 29%-133% and 2%-39%, respectively, when compared with the 3 implant model. Using a validated finite element model we demonstrated that placement of 3 implants across the SI joint using a transarticular orientation with superior implant reaching the sacral midline resulted in the most stable construct. Additional clinical studies may be required to confirm these results.

  5. Ion implantation as an efficient surface treatment

    International Nuclear Information System (INIS)

    Straede, C.A.

    1992-01-01

    Ion beam processing has for several years been well established in the semiconductor industry. In recent years ion implantation of tool steels, ceramics and even plastics has gained increasing industrial awareness. The development of ion implantation to a commercially viable surface treatment of tools and spare parts working in production type environments is very dependent on technical merits, economic considerations, competing processes and highly individual barriers to acceptance for each particular application. Some examples of this will be discussed. The development of the process is very closely linked with the development of high current accelerators and their ability to efficiently manipulate the samples being treated, or to make sample manipulation superfluous by using special beam systems like the PSII. Furthermore, the ability to produce high beam currents (mA) of a wide variety of ions is crucial. Previously, it was broadly accepted that ion implantation of tools on a commercial basis generally had to be limited to nitrogen implantation. The development of implanters which can produce high beam currents of ions like B + , C + , Ti + , Cr + and others is rapidly changing this situation, and today an increasing number of commercial implantations are performed with these ions although nitrogen is still successfully used in the majority of commercial implantation. All in all, the recent development of equipment makes it possible to a higher extent than before to tailor the implantation to a specific situation. The emerging new possibilities in this direction will be discussed, and a broad selection of practical examples of ion implantation at standard low temperatures of tools and spare parts will be given. Furthermore, very interesting results have been obtained recently by implanting nitrogen at elevated temperatures, which yields a relatively deep penetration of the implanted ions. (orig./WL)

  6. Tinnitus and Sleep Difficulties After Cochlear Implantation.

    Science.gov (United States)

    Pierzycki, Robert H; Edmondson-Jones, Mark; Dawes, Piers; Munro, Kevin J; Moore, David R; Kitterick, Pádraig T

    To estimate and compare the prevalence of and associations between tinnitus and sleep difficulties in a sample of UK adult cochlear implant users and those identified as potential candidates for cochlear implantation. The study was conducted using the UK Biobank resource, a population-based cohort of 40- to 69-year olds. Self-report data on hearing, tinnitus, sleep difficulties, and demographic variables were collected from cochlear implant users (n = 194) and individuals identified as potential candidates for cochlear implantation (n = 211). These "candidates" were selected based on (i) impaired hearing sensitivity, inferred from self-reported hearing aid use and (ii) impaired hearing function, inferred from an inability to report words accurately at negative signal to noise ratios on an unaided closed-set test of speech perception. Data on tinnitus (presence, persistence, and related distress) and on sleep difficulties were analyzed using logistic regression models controlling for gender, age, deprivation, and neuroticism. The prevalence of tinnitus was similar among implant users (50%) and candidates (52%; p = 0.39). However, implant users were less likely to report that their tinnitus was distressing at its worst (41%) compared with candidates (63%; p = 0.02). The logistic regression model suggested that this difference between the two groups could be explained by the fact that tinnitus was less persistent in implant users (46%) compared with candidates (72%; p reported difficulties with sleep were similar among implant users (75%) and candidates (82%; p = 0.28), but participants with tinnitus were more likely to report sleep difficulties than those without (p explanation is supported by the similar prevalence of sleep problems among implant users and potential candidates for cochlear implantation, despite differences between the groups in tinnitus persistence and related emotional distress. Cochlear implantation may therefore not be an appropriate intervention

  7. Avaliação do torque para inserção, remoção e fratura de diferentes mini-implantes ortodônticos Evaluation of insertion, removal and fracture torques of different orthodontic mini-implants in bovine tibia cortex

    Directory of Open Access Journals (Sweden)

    Maria Fernanda Prates da Nova

    2008-10-01

    Full Text Available OBJETIVO: avaliar, em mini-implantes de diferentes dimensões, os seguintes fatores: (a torque de inserção, (b torque de remoção, (c torque de fratura, (d tensão cisalhante, (e tensão normal e (f tipo de fratura. METODOLOGIA: foram utilizados 20 mini-implantes autoperfurantes, 10 da marca SIN e 10 da Neodent com, respectivamente, 8 e 7mm de comprimento, todos com 1,6mm de diâmetro. Dos 10 mini-implantes de cada marca, 5 não possuíam perfil transmucoso e 5 tinham perfil de 2mm, formando 4 grupos: SIN sem perfil (SSP, SIN com perfil (SCP, Neodent sem perfil (NSP e Neodent com perfil (NCP. Todos os mini-implantes foram inseridos em cortical óssea e removidos com micromotor acoplado a um torquímetro. Os mini-implantes foram, também, submetidos ao ensaio de fratura. Os torques de inserção, remoção e fratura, assim como a tensão cisalhante e normal calculadas, foram comparados entre todos os grupos pela ANOVA. O tipo de fratura foi avaliado em microscópio eletrônico de varredura. RESULTADOS: verificou-se que o grupo NCP apresentou torque de inserção significativamente maior que os demais grupos, porém todos fraturaram durante a inserção (n = 2 ou remoção (n = 3. Não houve diferença entre os grupos para o torque de remoção. Para o grupo NSP, o torque de fratura foi significativamente menor do que todos os outros grupos. Todos os mini-implantes sofreram fratura do tipo dúctil. CONCLUSÃO: uma vez que não houve diferença na resistência mecânica de ambas as marcas, variando apenas a forma, conclui-se que a resistência à fratura pode ser afetada por esta variável.AIM: The purpose of this study was to evaluate mini-implants with different dimensions for the following factors: (a insertion torque, (b removal torque, (c fracture torque, (d shear tension, (e normal tension and (f type of fracture. METHODS: Twenty self-drilling mini-implants were used, 10 from SIN and 10 from Neodent, with 1.6mm in diameter and with 8 and 7

  8. Early implant-associated osteomyelitis results in a peri-implanted bacterial reservoir

    DEFF Research Database (Denmark)

    Jensen, Louise Kruse; Koch, Janne; Aalbæk, Bent

    2017-01-01

    weight of Staphylococcus aureus or saline was inserted into the right tibial bone of 12 pigs. The animals were consecutively killed on day 2, 4 and 6 following implantation. Bone tissue around the implant was histologically evaluated. Identification of S. aureus was performed immunohistochemically...... on tissue section and with scanning electron microscopy and peptide nucleic acid in situ hybridization on implants. The distance of the peri-implanted pathological bone area (PIBA), measured perpendicular to the implant, was significantly larger in infected animals compared to controls (p = 0...

  9. 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.

  10. El virus de la inmunodeficiencia humana tipo 1 y el sistema nervioso central en desarrollo.

    Directory of Open Access Journals (Sweden)

    Jorge Alejandro Henao

    2005-03-01

    Full Text Available Actualmente, hay más de 42 millones de infectados con el virus de la inmunodeficiencia humana tipo 1 (VIH-1, de los cuales, 3,2 millones son niños y, de éstos, el 90% con transmisión vertical de la infección. Se considera que en Colombia más de 200.000 personas se han infectado desde el inicio de la pandemia y los estudios muestran una tendencia constante al aumento en las cifras de seroprevalencia en mujeres embarazadas y, por ende, en el número de recién nacidos infectados. El VIH-1 es primordialmente linfotrópico, pero su tropismo por el sistema nervioso central (SNC es bien conocido, lo que genera múltiples alteraciones neurológicas, particularmente prominentes en niños, de las cuales la más prevalerte es la encefalopatía. Clásicamente, se reconocen dos tipos de encefalopatía en esta población: encefalopatía temprana y tardía, ambas con diferentes características clínicas e inmunológicas. La infección por el VIH-1 en el SNC está limitada a los macrófagos, la microglía y los astrocitos en menor escala. Las neuronas, células principalmente afectadas en los pacientes con sida, raras veces son infectadas, por lo que se postula que factores solubles, provenientes tanto del huésped como del virus, son los principales causantes del daño neuronal. Los hallazgos presentados en esta revisión sugieren la posibilidad de que el SNC, en etapas tempranas del desarrollo, sea especialmente susceptible a la infección por el VIH-1. Las cifras epidemiológicas sugieren que este tipo de alteraciones clínicas serán cada vez más frecuentes; de ahí, la importancia de conocer la neuropatogénesis de la infección por el VIH-1.

  11. Qualidade de vida em adultos com diabetes tipo 1 e validade do DQOL-Brasil

    Directory of Open Access Journals (Sweden)

    Fábio Brasil

    2014-01-01

    Full Text Available O objetivo deste estudo foi estabelecer validade de critério e construto, e também, avaliar qualitativamente a versão brasileira do Questionário de Medida da Qualidade de Vida em Diabetes (DQOL-Brasil, quando utilizado em pacientes adultos com diabete melito (DM tipo 1. O DQOL-Brasil foi autoadministrado a 150 indivíduos (63,3% mulheres com tempo diagnóstico médio de DM tipo 1 de 14,17 anos e na faixa etária de 18 a 56 anos. O escore médio obtido foi de 2,46 (IC 95% 2,35 - 2,56. Entre os itens, os melhores e piores escores foram obtidos nos domínios de impacto da doença e preocupações com o DM, respectivamente. O instrumento como um todo apresentou elevada consistência interna, alfa de Cronbach = 0,94. Constatou-se validade convergente ao se co-administrar o questionário genérico de avaliação da qualidade de vida: Perfil de Saúde de Nottingham. O DQOL-Brasil foi readministrado a 52 pacientes em um intervalo médio de 98,25 dias, e constatou-se reprodutibilidade aceitável, através de coeficientes de correlação intraclasse superiores a 0,7. Entretanto, a análise fatorial comprovou deficiências. Deste modo, o DQOL-Brasil é válido para medida da qualidade de vida em pacientes adultos com DM tipo 1 e útil para aplicação em pesquisas e comparações com dados internacionais. Porém, para a prática clínica, recomenda-se seleção criteriosa dos itens do instrumento que sejam mais relacionados às características específicas da enfermidade em brasileiros; uma seleção ponderada de itens provavelmente seria útil às versões do DQOL traduzidas e validadas em outras nações.

  12. Relaciones entre estilos de personalidad y tipos de consumo de alcohol

    Directory of Open Access Journals (Sweden)

    Jairo Andrés Castañeda Arcila

    2013-01-01

    Full Text Available Objetivo. Esta investigación buscó identificar, en la población adulta del municipio de El Retiro (Antioquia, los tipos de consumo de alcohol, así como su relación con estilos de personalidad. Método. Se realizó un estudio transversal, descriptivo y correlacional. Se aplicaron dos instrumentos, Millon Inventory of Personality (MIPS y Alcohol Use Disorder Identification Test (Audit en una muestra de 61 participantes, de los cuales 33 fueron hombres y 28 mujeres. Resultados. El tipo de consumo de bebidas alcohólicas más frecuente en el municipio de El Retiro fue el consumo sin riesgo (68.9%. Además, se presentaron diferencias estadísticamente significativas en el tipo de consumo de alcohol según el género. Particularmente, los hombres registraron dependencia al alcohol. Asimismo, se halló que en los hombres el consumo de alcohol se encuentra relacionado con los estilos de personalidad como la innovación (r = 0.35, la discrepancia (r = 0.40 y el dominio (r = 0.46; mientras que en las mujeres se relacionan con la discrepancia (r = 0.38, la expansión (r = 0.39, la modificación (r = 0.40 y la adecuación (r = 0.42. Para ambos géneros, el consumo de riesgo se correlaciona con el estilo de sistematización (r = 0.67, el consumo perjudicial con la protección (r = 0.89 y la dependencia al alcohol con la indecisión (r = 0.99. Conclusión. Las tres categorías en las que se agrupan los estilos de personalidad (metas motivacionales, modos cognitivos y comportamientos interpersonales, se asociaron diferencialmente con el consumo sin riesgo, con riesgo, perjudicial y dependencia, encontrando que estas relaciones entre estilo de personalidad y consumo también muestran diferencia por género.

  13. Implantes eletrônicos para restabelecimento da visão em cegos Electronic implants to restore vision in blind patients

    Directory of Open Access Journals (Sweden)

    Eduardo Büchele Rodrigues

    2004-04-01

    Full Text Available O sucesso recente no desenvolvimento de uma prótese eletrônica coclear para surdos estimulou vários grupos de cientistas ao desenvolvimento de próteses visuais. A maioria dos protótipos de próteses visuais está baseada em estimulação elétrica neuronal em diferentes localizações do sistema visual até o sistema nervoso central. Atualmente os esforços estão concentrados em três localizações de implantes visuais: retina, nervo óptico e córtex. Implantes de retina e do nervo óptico têm o potencial de restabelecer a visão em pacientes com degenerações retinianas progressivas por meio de estimulação elétrica de neurônios do sistema visual. Próteses corticais podem beneficiar um número maior de pacientes cegos devido à sua localização mais posterior no sistema visual. Apesar dos grandes avanços, torna-se ainda necessária a elucidação de questões importantes na avaliação do funcionamento, em longo prazo, dos vários implantes eletrônicos para cegos, em estudo. Neste artigo analisamos os motivos que justificam o início dos experimentos nas três posições mencionadas e os desafios advindos de tal decisão.Recent success in the development of a prosthesis for the deaf patient encouraged several groups of scientists to develop and investigate a visual prosthesis. Visual prosthesis are based on neuronal electrical stimulation at different locations along the visual pathways, and three localizations of visual prosthesis are being researched, retina, optic nerve, and cortex. Retina and optic nerve implants may restore vision in patients with progressive retinal degenerations by means of electrical stimulation of visual pathway neurons. Cortex prosthesis may restore vision in a greater number of blind patients due to the more posterior location in the visual pathway. While major advances have been made in the field of visual prosthesis for the blind, a number of key questions remain to render a visual prosthesis

  14. Novel implant design improves implant survival in multirooted extraction sites: a preclinical pilot study.

    Science.gov (United States)

    Sivan-Gildor, Adi; Machtei, Eli E; Gabay, Eran; Frankenthal, Shai; Levin, Liran; Suzuki, Marcelo; Coelho, Paulo G; Zigdon-Giladi, Hadar

    2014-10-01

    The primary aim is to evaluate clinical, radiographic, and histologic parameters of novel implants with "three roots" design that were inserted into fresh multirooted extraction sockets. A secondary aim is to compare this new implant to standard root-form dental implants. Immediate implantation of novel or standard design 6 × 6-mm implants was performed bilaterally into multirooted sockets in mandibles of mini-pigs. Twelve weeks later, clinical, radiographic, stability, histomorphometric, and microcomputed tomography (micro-CT) analyses were performed. Survival rates were significantly higher in the test implants compared with control (92.8% versus 33.3%, respectively; P micro-CT analyses demonstrated bone fill in the inner part of the test implants. Moreover, bone-to-implant contact was higher in the test implants (55.50% ± 3.68% versus 42.47% ± 9.89%). Contrary to the clinical, radiographic, and histomorphometric results, resonance frequency analysis measurements were greater in the control group (77.74 ± 3.21 implant stability quotient [ISQ]) compared with the test group (31.09 ± 0.28 ISQ), P = 0.008. The novel design implants resulted in significantly greater survival rate in multirooted extraction sites. Further studies will be required to validate these findings.

  15. 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.

  16. Long range implantation by MEVVA metal ion source

    International Nuclear Information System (INIS)

    Zhang Tonghe; Wu Yuguang; Ma Furong; Liang Hong

    2001-01-01

    Metal vapor vacuum arc (MEVVA) source ion implantation is a new technology used for achieving long range ion implantation. It is very important for research and application of the ion beam modification of materials. The results show that the implanted atom diffusion coefficient increases in Mo implanted Al with high ion flux and high dose. The implanted depth is 311.6 times greater than that of the corresponding ion range. The ion species, doses and ion fluxes play an important part in the long-range implantation. Especially, thermal atom chemistry have specific effect on the long-range implantation during high ion flux implantation at transient high target temperature

  17. Martensite transformation in antimony implanted stainless steel

    International Nuclear Information System (INIS)

    Johnson, E.; Littmark, U.; Johansen, A.; Christodoulides, C.

    1981-01-01

    The authors have used Rutherford backscattering analysis (RBS) and transmission electron microscopy (TEM) and diffraction to investigate austenitic stainless steel crystals implanted at room temperature with 80 keV Sb + ions to a fluence of 5 x 10 20 ions/m 2 , thus providing implantation with a heavy group V element. RBS channeling spectra from implanted crystals show a damage peak which approaches the height of the random level and therefore indicates a very high degree of disorder in the implanted layers. The distribution of the disorder extends to a depth 3-5 times the depth of the primary radiation damage. The Sb peaks under channeling as well as random conditions are indistinguishable, confirming that substitutionality during implantation is negligible. To establish the nature of the disorder which cannot be assessed from the RBS analysis alone, and in particular to assess whether an amorphous alloy is formed in the implanted layer as indicated from the RBS spectra, samples implanted under similar conditions were investigated in the TEM. Significant extra spots in the patterns can be ascribed to the presence of a radiation induced b.c.c. phase of martensitic origin. The result that a significant amount of martensite can be induced by antimony implantation seems to indicate that the main driving force for the transition is due to damage induced stress concentrations. (Auth.)

  18. Laser annealing of ion implanted silicon

    International Nuclear Information System (INIS)

    White, C.W.; Narayan, J.; Young, R.T.

    1978-11-01

    The physical and electrical properties of ion implanted silicon annealed with high powered ruby laser radiation are summarized. Results show that pulsed laser annealing can lead to a complete removal of extended defects in the implanted region accompanied by incorporation of dopants into lattice sites even when their concentration far exceeds the solid solubility limit

  19. Thermal behaviour of nitrogen implanted into zirconium

    International Nuclear Information System (INIS)

    Miyagawa, S.; Ikeyama, M.; Saitoh, K.; Nakao, S.; Niwa, H.; Tanemura, S.; Miyagawa, Y.

    1994-01-01

    Zirconium films were implanted with 15 N ions of energy 50keV to a total fluence of 1x10 18 ionscm -2 in an attempt to study the formation process and thermal stability of ZrN layers produced by high fluence implantation of nitrogen. Subsequent to the implantation at room temperature, samples were annealed at temperatures of 300 C-900 C. The depth profiles of the implanted nitrogen were measured by nuclear reaction analysis using the 15 N(p,αγ) 12 C at E R =429keV, and the surfaces were examined by thin film X-ray diffraction (XRD) and scanning electron microscopy. There were many blisters 0.2-0.4μm in diameter on the surface of the as-implanted samples and double peaks were observed in the nitrogen depth profiles; they were in both sides of the mean projected range. It was found that most of the blisters became extinct after annealing above 400 C, and the XRD peak (111) intensity was increased with the increase in the annealing temperature. Moreover, 14 N and 15 N implantations were superimposed on Zr samples in order to study the atomic migration of nitrogen at each stage of high fluence implantation. It was found that the decrease in the peak at the deeper layers was related to blister extinction and nitrogen diffusion into underling zirconium which could be correlated with radiation damage induced by post-implanted ions. ((orig.))

  20. Magnetoreflection studies of ion implanted bismuth

    International Nuclear Information System (INIS)

    Nicolini, C.; Chieu, T.C.; Dresselhaus, M.S.; Massachusetts Inst. of Tech., Cambridge; Dresselhaus, G.

    1982-01-01

    The effect of the implantation of Sb ions on the electronic structure of the semimetal bismuth is studied by the magnetoreflection technique. The results show long electronic mean free paths and large implantation-induced increases in the band overlap and L-point band gap. These effects are opposite to those observed for Bi chemically doped with Sb. (author)

  1. Wireless Power Transfer Strategies for Implantable Bioelectronics.

    Science.gov (United States)

    Agarwal, Kush; Jegadeesan, Rangarajan; Guo, Yong-Xin; Thakor, Nitish V

    2017-01-01

    Neural implants have emerged over the last decade as highly effective solutions for the treatment of dysfunctions and disorders of the nervous system. These implants establish a direct, often bidirectional, interface to the nervous system, both sensing neural signals and providing therapeutic treatments. As a result of the technological progress and successful clinical demonstrations, completely implantable solutions have become a reality and are now commercially available for the treatment of various functional disorders. Central to this development is the wireless power transfer (WPT) that has enabled implantable medical devices (IMDs) to function for extended durations in mobile subjects. In this review, we present the theory, link design, and challenges, along with their probable solutions for the traditional near-field resonant inductively coupled WPT, capacitively coupled short-ranged WPT, and more recently developed ultrasonic, mid-field, and far-field coupled WPT technologies for implantable applications. A comparison of various power transfer methods based on their power budgets and WPT range follows. Power requirements of specific implants like cochlear, retinal, cortical, and peripheral are also considered and currently available IMD solutions are discussed. Patient's safety concerns with respect to electrical, biological, physical, electromagnetic interference, and cyber security from an implanted neurotech device are also explored in this review. Finally, we discuss and anticipate future developments that will enhance the capabilities of current-day wirelessly powered implants and make them more efficient and integrable with other electronic components in IMDs.

  2. Libyan cochlear implant programme: achievements, difficulties, and ...

    African Journals Online (AJOL)

    Data relating to the patients who received cochlear implantation at Tripoli Medical Centre between October 2007 and February 2010 were analysed. Implant operations were performed on 37 patients. All patients received Med-El SONATATI100 devices. Thirty-four (91.9%) of these patients were children, whilst three (8.1%) ...

  3. Dental implants: A boon to dentistry

    Directory of Open Access Journals (Sweden)

    B H Sripathi Rao

    2015-01-01

    Full Text Available The development and use of implants is one of the biggest advances in dentistry in the last few decades. It has helped to give many solutions to tooth loss as well as maxillo facial prosthetics. This article traces the history and evolution of dental implants.

  4. Wettability control of polystyrene by ion implantation

    International Nuclear Information System (INIS)

    Suzuki, Yoshiaki; Kusakabe, Masahiro; Iwaki, Masaya

    1994-01-01

    The permanent effects of ion implantation on the improvement of wettability of polystyrene is investigated in relation to ion species and fluences. The He + , Ne + , Na + , N 2 + , O 2 + , Ar + , K + and Kr + ion implantations were performed at energies of 50 and 150 keV at room temperature. The fluences ranged from 1x10 15 to 1x10 17 ions/cm 2 . The results showed that the contact angle of water for Na + and K + implanted polystyrene decreased from 87 to 0 , as the fluences increased to 1x10 17 ions/cm 2 at an energy of 50 keV. The contact angle for Na + and K + implanted polystyrene did not change under ambient room conditions, even when time elapsed. However, the contact an gle for He + , C + , O + , Ne + , N 2 + , O 2 + , Ar + , and Kr + ion implanted specimens decreased slightly immediately after ion implantation. Results of X-ray photoelectron spectroscopy showed that the increase in the Na content in the surface of Na + implanted specimens were observed with increasing fluence. It is concluded that permanent improvement in wettability was caused by doping effects rather than by radiation effects from Na + and K + ion implantation. ((orig.))

  5. Electroconvulsive therapy after maxillofacial metallic implants.

    Science.gov (United States)

    Freeman, G Mark; Perry, Matthew T; Manatt, George S; Cristancho, Pilar

    2014-03-01

    A growing body of literature suggests that electroconvulsive therapy (ECT) can be safely utilized in patients with craniofacial metallic implants. Here we provide radiographic images and the clinical course of a 49-year-old woman with both maxillary and mandibular metallic implants who safely received ECT.

  6. Biomimetic implants for pelvic floor repair

    NARCIS (Netherlands)

    Vashaghian, Mahshid; Zaat, Sebastianus A. J.; Smit, Theodoor H.; Roovers, Jan-Paul

    2017-01-01

    Polypropylene implants are used for the reconstructive surgery of urogynaecological disorders like pelvic organ prolapse, but severe complications associated with their use have been reported. There is evidence that surface properties and a difference in mechanical stiffness between the implant and

  7. Oral Abstract Session 3: Orthognathic/Implants

    DEFF Research Database (Denmark)

    Hartlev, Jens

    Immediate Placement And Provisionalization Of Single-tooth Implants Involving A Final Individual Abutment. A 3-year Clinical And Radiographic Retrospektive Study......Immediate Placement And Provisionalization Of Single-tooth Implants Involving A Final Individual Abutment. A 3-year Clinical And Radiographic Retrospektive Study...

  8. 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.

  9. Simplifying cochlear implant speech processor fitting

    NARCIS (Netherlands)

    Willeboer, C.

    2008-01-01

    Conventional fittings of the speech processor of a cochlear implant (CI) rely to a large extent on the implant recipient's subjective responses. For each of the 22 intracochlear electrodes the recipient has to indicate the threshold level (T-level) and comfortable loudness level (C-level) while

  10. 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.

  11. Polymeric implant of methylprednisolone for spinal injury ...

    African Journals Online (AJOL)

    Polymeric implant of methylprednisolone for spinal injury: preparation and characterization. Bo Yin, Jian-Jun Ji, Ming Yang. Abstract. 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 ...

  12. 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 ...

  13. 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.

  14. Different encapsulation strategies for implanted electronics

    Directory of Open Access Journals (Sweden)

    Winkler Sebastian

    2017-09-01

    Full Text Available Recent advancements in implant technology include increasing application of electronic systems in the human body. Hermetic encapsulation of electronic components is necessary, specific implant functions and body environments must be considered. Additional functions such as wireless communication systems require specialized technical solutions for the encapsulation.

  15. Physical Properties of Silicone Gel Breast Implants.

    Science.gov (United States)

    Jewell, Mark L; Bengtson, Bradley P; Smither, Kate; Nuti, Gina; Perry, TracyAnn

    2018-04-28

    Surgical applications using breast implants are individualized operations to fill and shape the breast. Physical properties beyond shape, size, and surface texture are important considerations during implant selection. Compare form stability, gel material properties, and shell thickness of textured shaped, textured round, and smooth round breast implants from 4 manufacturers: Allergan, Mentor, Sientra, and Establishment Labs through bench testing. Using a mandrel height gauge, form stability was measured by retention of dimensions on device movement from a horizontal to vertical supported orientation. Dynamic response of gel material (gel cohesivity, resistance to gel deformation, energy absorption) was measured using a synchronized target laser following application of graded negative pressure. Shell thickness was measured using digital thickness gauge calipers. Form stability, gel material properties, and shell thickness differed across breast implants. Of textured shaped devices, Allergan Natrelle 410 exhibited greater form stability than Mentor MemoryShape and Sientra Shaped implants. Allergan Inspira round implants containing TruForm 3 gel had greater form stability, higher gel cohesivity, greater resistance to gel deformation, and lower energy absorption than those containing TruForm 2 gel and in turn, implants containing TruForm 1 gel. Shell thickness was greater for textured versus smooth devices, and differed across styles. Gel cohesivity, resistance to gel deformation, and energy absorption are directly related to form stability, which in turn determines shape retention. These characteristics provide information to aid surgeons choosing an implant based on surgical application, patient tissue characteristics, and desired outcome.

  16. 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 relat...

  17. Deafblind People's Experiences of Cochlear Implantation

    Science.gov (United States)

    Soper, Janet

    2006-01-01

    Cochlear implants are electronic devices that create the sensation of hearing in those who cannot obtain any benefit from conventional hearing aids. This article examines the experience of cochlear implantation in a select group of individuals with acquired deafblindness, focusing on three key themes: access to communication, information and…

  18. Experiencia clínica en monitorización cardiaca extendida con el sistema inalámbrico satelital tipo SEEQ

    Directory of Open Access Journals (Sweden)

    Diego Vanegas-Cadavid

    2018-05-01

    Full Text Available Resumen: Objetivos: Dar a conocer la experiencia clínica con un nuevo sistema de monitorización cardiaca extendida (por 15 días, inalámbrica y satelital en un grupo de pacientes con sospecha de arritmias cardíacas. Metodología: Cohorte de 100 pacientes atendidos en la unidad de Electrofisiología cardiovascular de un centro de referencia, con sospecha de arritmia cardíaca, sin diagnóstico electrocardiográfico causal, a pesar de exámenes previos. Se les aplicó una monitorización cardiaca externa tipo SEEQ (Medtronic por 15 días y se registró el desenlace. Resultados: De un total de 100 sujetos estudiados, 51% eran hombres, con mediana de edad de 60 años (rango: 5 - 91 años. El principal síntoma fueron las palpitaciones (42% y la comorbilidad más prevalente la hipertensión arterial (47%; 98% tenían estudio de Holter previo y 46% dos estudios sin resultado conclusivo que explicara los síntomas. La monitorización tipo SEEQ documentó anormalidad electrocardiográfica significativa en 22% de los pacientes. El implante de marcapaso fue el tratamiento más aplicado y la fibrilación auricular fue la arritmia más frecuente en el 50% de los hallazgos positivos. Hubo una proporción mayor y significativa de diagnósticos positivos en el sexo masculino. Conclusiones: La monitorización cardiaca externa inalámbrica, satelital, extendida por 15 días es una herramienta novedosa que incrementa la probabilidad de documentar una anormalidad electrocardiográfica clínicamente significativa en quienes padecen síntomas cardiovasculares recurrentes. Abstract: Objectives: To present the clinical experience with a new extended (for 15 days, wireless, and satellite cardiac monitoring system in a group of patients with suspicion of cardiac arrhythmia. Method: The study included a cohort of 100 patients seen in the Cardiovascular Electrophysiology Unit of a reference hospital. They were suspected of having a cardiac arrhythmia, with no

  19. Niobium stainless steel for implants

    International Nuclear Information System (INIS)

    Rollo, J.M.D.A.

    1983-01-01

    The materials that have often been used, during the last two or three decades, to carry out materials for implants are made according to the specifications: a)A.S.T.M. (F.55-76, F.56-76, F.138-76, F.139-76) stainless steel b)A.S.T.M. (F.75-76), cobalt-chromium-molybdenum alloys. c)A.S.T.M. (F.90-76), cobalt-chromium-tungsten-nickel alloys. d)A.S.T.M. (F.67-77), unalloyed titanium. e)A.S.T.M. (F.136-70), titanium alloys. It was the purpose of retaking them, toverify the niobium influence as alloy element in ANSI/ASTM F.55-76 classification stainless steels, usually for these materials elaboration. The problem by substituting molybdenum total or partially for niobium, by comparing the mechanical and corrosion properties, and biocompatibility is presented, by pointing out the variables of these substitutions, when we employ this new material to perform materials for implants. (Author) [pt

  20. Diclofenac Sodium Loaded Multicomponent Implant

    Science.gov (United States)

    Nikkola, Lila; Viitanen, Petrus; Ashammakhi, Nureddin

    2008-02-01

    Earlier we have reported on developing DS releasing bioabsorbable rods for inhibition of osteolysis [l]. Due to their unsatisfactory drug release profiles we assessed the use of sintering technique of enhancement of drug release in the current study. Melt extruded PLGA 80/20 rods were compounded 8 wt-% DS. Some rods were self reinforced (SR) and some of them were sterilized to get three different components with different drug release profiles. Different rods were sintered together with heat and pressure. Three different specimen groups with different construction were studied. Thermal properties were analyzed using differential scanning calorimetry (DSC). Changes of IV were performed with capillary analysis and drug release measurements with UV-Vis spectrophotometer. Mechanical strength were measured two weeks, when disintegration occurred. Release rate consisted of 1) sharp jump start peak, 2) second smoother peak, and 3) third smooth peak. Released DS concentrations reached local therapeutic levels and maintained at that stage for 24-36 days. All DS was released during 50-70 days. The drug release from multicomponent implant was more stable and commenced earlier than from initial rods. Such properties were favored ones. Initial shear strength was 82 MPa and it decreased to 15 MPa. The mechanical bonding was sufficient although the components disintegrated relatively fast. By sintering different PLGA/DS components with different release rates it is possible to construct a truly controlled release implant for bone fixation with anti-inflammatory properties.

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

    International Nuclear Information System (INIS)

    Pedroso, Ludmila Assuncao de Mello; Silva, Maria Alves Garcia Santos; Garcia, Robson Rodrigues; Leles, Jose Luiz Rodrigues; Leles, Claudio Rodrigues

    2013-01-01

    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). It was concluded that CBCT improves the ability of predicting the actual implant length and reduces inaccuracy in surgical dental implant planning. (author)

  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. Current status of grafts and implants in rhinoplasty: Part II. Homologous grafts and allogenic implants.

    Science.gov (United States)

    Sajjadian, Ali; Naghshineh, Nima; Rubinstein, Roee

    2010-03-01

    After reading this article, the participant should be able to: 1. Understand the challenges in restoring volume and structural integrity in rhinoplasty. 2. Identify the appropriate uses of various homologous grafts and allogenic implants in reconstruction, including: (a) freeze-dried acellular allogenic cadaveric dermis grafts, (b) irradiated cartilage grafts, (c) hydroxyapatite mineral matrix, (d) silicone implants, (e) high-density polyethylene implants, (f) polytetrafluoroethylene implants, and (g) injectable filler materials. 3. Identify the advantages and disadvantages of each of these biomaterials. 4. Understand the specific techniques that may aid in the use these grafts or implants. This review specifically addresses the use of homologous grafts and allogenic implants in rhinoplasty. It is important to stress that autologous materials remain the preferred graft material for use in rhinoplasty, owing to their high biocompatibility and low risk of infection and extrusion. However, concerns of donor-site morbidity, graft availability, and graft resorption have motivated the development and use of homologous and allogenic implants.

  4. 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.

  5. Importance of cochlear health for implant function.

    Science.gov (United States)

    Pfingst, Bryan E; Zhou, Ning; Colesa, Deborah J; Watts, Melissa M; Strahl, Stefan B; Garadat, Soha N; Schvartz-Leyzac, Kara C; Budenz, Cameron L; Raphael, Yehoash; Zwolan, Teresa A

    2015-04-01

    Amazing progress has been made in providing useful hearing to hearing-impaired individuals using cochlear implants, but challenges remain. One such challenge is understanding the effects of partial degeneration of the auditory nerve, the target of cochlear implant stimulation. Here we review studies from our human and animal laboratories aimed at characterizing the health of the implanted cochlea and the auditory nerve. We use the data on cochlear and neural health to guide rehabilitation strategies. The data also motivate the development of tissue-engineering procedures to preserve or build a healthy cochlea and improve performance obtained by cochlear implant recipients or eventually replace the need for a cochlear implant. This article is part of a Special Issue entitled . Copyright © 2014 Elsevier B.V. All rights reserved.

  6. Surface modification of metals by ion implantation

    International Nuclear Information System (INIS)

    Iwaki, Masaya

    1988-01-01

    Ion implantation in metals has attracted the attention as a useful technology for the formation of new metastable alloys and compounds in metal surface layers without thermal equilibrium. Current studies of metal surface modification by ion implantation with high fluences have expanded from basic research areas and to industrial applications for the improvement of life time of tools. Many results suggest that the high fluence implantation produces the new surface layers with un-expected microscopic characteristics and macroscopic properties due to implant particles, radiation damage, sputtering, and knock-on doping. In this report, the composition, structure and chemical bonding state in surface layers of iron, iron-based alloy and aluminum sheets implanted with high fluences have been investigated by means of secondary ion mass spectroscopy (SIMS), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Tribological properties such as hardness, friction and wear are introduced. (author)

  7. Mutagenic effects of ion implantation on stevia

    International Nuclear Information System (INIS)

    Wang Cailian; Shen Mei; Chen Qiufang; Lu Ting; Shu Shizhen

    1998-01-01

    Dry seeds of Stevia were implanted by 75 keV nitrogen and carbon ions with various doses. The biological effects in M 1 and mutation in M 2 were studied. The results showed that ion beam was able to induce variation on chromosome structure in root tip cells. The rate of cells with chromosome aberration was increased with ion beam dose. The rate of cells with chromosomal aberration was lower than that induced with γ-rays. Frequency of the mutation induced by implantation of N + and C + ions were higher than those induced by γ-rays. The rate of cell with chromosome aberration and in M 2 useful mutation induced by implantation of C + ion was higher than those induced by implantation of N + ion. Mutagenic effects Feng 1 x Riyuan and Riyuan x Feng 2 by implantation of N + and C + were higher than that of Jining and Feng 2

  8. Study of hydrogen implanted in aluminium

    International Nuclear Information System (INIS)

    Bugeat, J.P.; Chami, A.C.; Danielou, R.; Ligeon, E.

    1976-01-01

    An aluminium sample was implanted with deuterium and hydrogen at 5keV and 10keV respectively. The 1 H( 11 B,α) 8 Be* and D( 3 He,p) 4 He reactions were used for the analysis of H and D respectively. The implanted deuterium was shown to be as a whole in a tetrahedral site as far as the implantation temperature is lower than 175K, beyond that temperature the deuterium is randomly located. When the implantation temperature increases from 33K up to 275K the tetrahedral siting remains during annealing. The migration temperatures of hydrogen (or temperature of transition from the tetrahedral siting to a random distribution) experimentally observed during annealing (300K) and for increased implantation temperatures, show that the tetrahedral site is associated with a monovacancy migrating at 300K, the diffusion temperature of hydrogen being lower than 180K [fr

  9. Hydrogenation of stainless steels implanted with nitrogen

    International Nuclear Information System (INIS)

    Silva Ramos, L.E. da.

    1989-01-01

    In the present work the effects of both ion implantation and hydrogenation on the fatigue behaviour of an AISI-304 type unstable stainless steel was studied. The material was tested under the following microstructural conditions: annealed; annealed plus hydrogenated; annealed plus ion-implanted; annealed, ion-implanted and hydrogeneted. The hydrogen induced phase transformations were also studied during the outgassing of the samples. The ion implanted was observed to retard the kinetics of the hydrogen induced phase transformations. It was also observed that the nitrogen ion implantation followed by both natural (for about 4 months) and artificial (100 0 C for 6 hours) aging treatments was beneficial to the fatigue life of both non hydrogenated and severely hydrogenated samples. (author) [pt

  10. High-energy ion implantation of materials

    International Nuclear Information System (INIS)

    Williams, J.M.

    1991-11-01

    High-energy ion implantation is an extremely flexible type of surface treatment technique, in that it offers the possibility of treating almost any type of target material or product with ions of almost any chemical species, or combinations of chemical species. In addition, ion implantations can be combined with variations in temperature during or after ion implantation. As a result, the possibility of approaching a wide variety of surface-related materials science problems exists with ion implantation. This paper will outline factors pertinent to application of high-energy ion implantation to surface engineering problems. This factors include fundamental advantages and limitations, economic considerations, present and future equipment, and aspects of materials science

  11. 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.

  12. Selenium implantation in epitaxial gallium arsenide layers

    International Nuclear Information System (INIS)

    Inada, T.; Tokunaga, K.; Taka, S.; Yuge, Y.; Kohzu, H.

    1981-01-01

    Selenium implantation at room temperature in S-doped epitaxial GaAs layers as a means of the formation of n + layers has been investigated. Doping profiles for Se-implanted layers have been examined by a C-V technique and/or a differential Hall effect method. It has been shown that n + layers with a maximum carrier concentration of approx. equal to1.5 x 10 18 cm -3 can be formed by implantation followed by a 15 min annealing at 950 0 C. Contact resistance of ohmic electrodes is reduced by use of the Se-implanted n + layers, resulting in the improvement on GaAs FET performance. Measured minimum noise figure of the Se-implanted GaAs FETs is 0.74 dB at 4 GHz. (orig.)

  13. Experimental study on bone tissue reaction around HA implants radiated after implantation

    International Nuclear Information System (INIS)

    Kudo, Masato; Matsui, Yoshiro; Tamura, Sayaka; Chen, Xuan; Uchida, Haruo; Mori, Kimie; Ohno, Kohsuke; Michi, Ken-ichi

    1998-01-01

    This study was conducted to investigate histologically and histomorphometrically the tissue reaction around hydroxylapatite (HA) implants that underwent irradiation in 3 different periods in the course of bone healing after implantation. The cylindrical high-density HA implants were implanted in 48 Japanese white rabbit mandibles. A single 15 Gy dose was applied to the mandible 5, 14, or 28 days after implantation. The rabbits were sacrificed 7, 14, 28, and 90 days after irradiation. Nonirradiated rabbits were used as controls. CMR, labeling with tetracycline and calcein, and non-decalcified specimens stained with toluidine blue were used for histological analyses and histomorphometric measurements. The results were as follows: In the rabbits irradiated 5 days after implantation, the HA-bone contact was observed later than that in the controls and the bone-implant contact surface ratio was lower than that in the controls at examination because necrosis of the newly-formed bone occurred just after irradiation. HA-bone contact of the rabbits irradiated 14 and 28 days after implantation was similar to that of the controls. And, bone remodeling was suppressed in rabbits of each group sacrificed at 90 days after irradiation. The results suggested that a short interval between implantation and irradiation causes direct contact between HA implant and bone and a long lapse of time before irradiation hardly affects the bone-implant contact, but delays bone remodeling. Therefore, it is necessary to prevent overloading the HA implants irradiated after implantation and pay utmost attention to conditions around the bone-implant contact. (author)

  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. Comparação do crescimento de Saccharomyces boulardii em fermentador por batelada tipo air lift e shaker Comparison of Saccharomyces boulardii growth in an air-lift fermentor and in a shaker

    Directory of Open Access Journals (Sweden)

    José Luis Muller

    2007-12-01

    Full Text Available Os fermentadores tipo air lift oferecem vantagens tais como: eficiente homogeneização dos componentes, baixo cisalhamento e economia de energia, pois o meio é agitado pelo processo de aeração, sem necessidade de agitação mecânica. O objetivo deste trabalho foi analisar a cinética de crescimento de Saccharomyces boulardii neste fermentador, com aeração de 1 e 1,5 vvm (volume de ar por volume de meio, por minuto, comparada com o crescimento em frascos agitados em shaker, visando a futura aplicação deste fermentador, em escala industrial. Os resultados indicaram que houve uma diminuição do pH com o consumo da glicose do meio, a qual foi totalmente consumida até o final da fase exponencial, de 5 e 6 horas para o shaker e o air lift, respectivamente. Após este período houve uma alteração na velocidade de crescimento de S. boulardii, em ambos os equipamentos, indicando uma possível mudança na fonte de carbono utilizada, uma vez que toda a glicose foi consumida após estes períodos. Os valores de velocidades específicas de crescimento foram semelhantes para o shaker e air-lift com 1,0 vvm, porém inferiores ao air-lift com 1,5 vvm, indicando que neste último reator há possibilidades de se conseguir uma velocidade de produção celular maior, dependendo apenas da eficiência de oxigenação oferecida.This work aimed to analyze the kinetics of S. boulardii growth in an air lift fermentor under two aeration conditions: 1 and 1.5 air vvm (air volume per volume of culture medium per minute, in comparison with growth in shaken flasks, with a view to the future application of this fermenter on an industrial scale. Air lift fermentors offer advantages such as efficient homogenization of the components, low shear stress, and energy savings because the medium is stirred by aeration and does not require mechanical stirring. The pH of the medium decreased with the glucose uptake during the exponential phase, probably due to the formation

  16. Influência dos grãos deteriorados ("tipo" sobre a qualidade da "bebida" de café Influence of deteriorated coffee beans on the taste of the beverage

    Directory of Open Access Journals (Sweden)

    Walter Lazzarini

    1958-01-01

    Full Text Available Neste trabalho foi estudada a hipótese de que os grãos de café deteriorados - parcial ou totalmente - existentes normalmente no café beneficiado, pudessem ocasionar desvalorização na qualidade da BEBIDA além do natural rebaixamento do TIPO. Em amostras de café de diversas procedências foi constatado que há acentuada influência dos grãos deteriorados na qualidade da bebida. Cafés isentos de grãos deteriorados foram classificados como de bebida estritamente mole ou mole tornando-se de bebida dura quando nesse mesmo café se encontrou elevada quantidade daqueles grãos. Com menores proporções de grãos deteriorados eram obtidas bebidas de classificação intermediária. Para os cafés de bebida Rio não houve variação na classificação: as amostras com ou sem grãos deteriorados se apresentavam sempre com a mesma bebida.Partly or fully deteriorated beans are present in varying amounts in commercial coffee. They seem to have been affected by external agents prior to drying and vary in color from almost normal to black. The experiments reported in this paper were designed to study the influence of the deteriorated beans on the coffee flavor. Samples were secured from the various coffee growing areas of São Paulo: Campinas, Ribeirão Prêto, Mococa, Pindorama, and Vale do Paraíba. Each was hand--graded, the partly or fully deteriorated beans being separated from the normal ones. The normal beans were then mixed with varying amounts of partly or fully deteriorated beans from the same samples. The following blends were prepared for each of the coffee sources: 1 . normal beans only 2. partly deteriorated beans exclusively 3. mixture of normal beans plus 10% in weight of partly deteriorated ones 4. ditto with 20% 5. ditto with 40% 6. ditto with 2.5% of fully deteriorated beans 7. ditto with 5% 8. ditto with 10% The 8 treatments for each source were replicated 4 times, giving thus a total of 256 variables. They were then submitted to

  17. Armazenamento de soja em silos tipo bolsa Soybean storage in bag type silos

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    Lêda R. A. Faroni

    2009-03-01

    Full Text Available Avaliaram-se as principais alterações qualitativas de soja armazenada em silos tipo bolsa e do óleo bruto extraído de soja com teores de água de 17,4% e 13,3%, armazenada em dois silos tipo bolsa, por 180 dias. Realizaram-se amostragens no dia do enchimento das bolsas, aos 30; 90 e 180 dias de armazenamento. Analisaram-se o teor de água, a condutividade elétrica, o percentual de germinação, a massa específica aparente da soja, além do teor de ácidos graxos livres e o índice de peróxido do óleo bruto extraído dela. Os teores de água da soja armazenada úmida e seca mantiveram-se próximos dos valores obtidos no início do período de armazenamento. Observou-se tendência de elevação da condutividade elétrica e decréscimo do percentual de germinação somente na soja úmida, principalmente após 90 dias de armazenamento. Não foi verificado decréscimo da massa específica aparente do material armazenado úmido e seco. Com relação aos parâmetros qualitativos do óleo bruto, observou-se que os valores obtidos se mantiveram abaixo do limite máximo exigido pela legislação para a comercialização de óleo bruto de soja. Pode-se concluir que os silos tipo bolsa representam alternativa viável do ponto de vista qualitativo para armazenagem de soja, e esse tipo de estrutura não ocasiona alterações qualitativas significativas no óleo bruto obtido desse material, em condições similares àquelas deste estudo.This study reports major qualitative changes in the soybean grains and the extracted crude oil when stored in bag type silos. Grains with moisture content of 17.4 or 13.3% were stored in two bag type silos. Samples were taken 30, 90 and 180 days of storage , to determine moisture content, electric conductivity of the grain leachate, germination percentage, apparent specific grain mass, and free fatty acid content, and peroxide index of the crude oil extracted from these grains. The wet and dry grains remained with

  18. Incidencia en los tipos de acoso sexual en el trabajo en España

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    Cristina Cuenca-Piqueras

    2014-01-01

    Full Text Available El acoso sexual en el trabajo ha sido clasificado de muy diversas formas debido a los diferentes comportamientos que se incluyen bajo este concepto. En el presente trabajo se analizan las múltiples tipologías de acoso sexual, realizando una propuesta propia. Además, se pretende comprobar que esta clasificación tiene sentido práctico utilizando la Técnica del Escalamiento Multidimensional ( alscal , y al mismo tiempo, comprobar la fuerza explicativa de la Teoría multidimensional del acoso en España. Los resultados muestran diferencias respecto al conjunto de nacionales y extranjeras, pues las mujeres migrantes sufren los tipos más graves de acoso sexual en mayor proporción que las autóctonas.

  19. Esporotricosis cutánea diseminada con compromiso articular en una mujer con diabetes tipo 2

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    Sendy Solorzano

    Full Text Available La esporotricosis diseminada es una presentación infrecuente de esta micosis. Aunque ha sido descrita en sujetos inmunocompetentes, con frecuencia existe compromiso de la inmunidad mediada por células T. Reportamos el caso de una mujer con diabetes tipo 2 no controlada que desarrolló esporotricosis cutánea diseminada. El curso de la enfermedad presentó varias complicaciones que incluyeron hepatitis secundaria a itraconazol y artritis de la rodilla con cultivo positivo para Sporothrix schenckii durante el tratamiento con solución saturada de ioduro de potasio. La discusión del caso incluye aspectos de la patogénesis de la esporotricosis diseminada y el manejo de la infección y sus complicaciones.

  20. Comportamento experimental de diferentes tipos de conectores metálicos

    OpenAIRE

    Valente, Isabel B.

    2016-01-01

    A realização de estruturas mistas de aço e betão requer o funcionamento conjunto destes dois materiais. A ligação entre eles é conseguida com a utilização de conectores metálicos. Neste âmbito, tem sido realizada uma considerável quantidade de estudos que abordam o comportamento de diversos tipos de conectores metálicos. O desejo de obter um comportamento óptimo com custos mínimos motivou o desenvolvimento de várias soluções. Neste artigo, procura-se descrever o comportamento de diferente...

  1. CONSTRUÇÕES BINOMINAIS DO TIPO SN1 DE SN2

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    Karen Sampaio Braga Alonso

    2017-04-01

    Full Text Available Este artigo tem por objetivo investigar a flutuação de sentido quantidade-qualidade licenciada pelo uso de construtos binominais do tipo SN1 de SN2, como xícara de chá, no Português do Brasil.A pesquisa é baseada na perspectiva teórica da Linguística Funcional Centrada no Uso (BYBEE, 2010; BARLOW E KEMMER, 2000; TOMASELLO, 2003, TRAUGOTT, 2008 e busca descrever as propriedades morfossintáticas, semântico-pragmáticas e cognitivas dos usos das construções que favorecem uma leitura ora qualitativa ora quantitativa, no que se refere à relação entre SN1 e SN2.

  2. Adolescentes com Diabetes Mellitus Tipo 1: Estresse, enfrentamento e adesão ao tratamento

    OpenAIRE

    Victório, Vanessa Marques Gibran

    2016-01-01

    O Diabetes Mellitus Tipo 1 (DM1) é uma condição crônica de saúde caracterizada pelo excesso de glicose no sangue e produção deficiente de insulina pelo pâncreas, exigindo a ingestão diária de insulina para o controle metabólico. Este é afetado por variáveis psicossociais, especialmente durante a adolescência, que é uma fase de risco para reações de estresse. A forma como o adolescente lida com o estresse depende, em parte, de seu repertório de enfrentamento. As estratégias de enfrentamento [E...

  3. Establecimiento de reglas prosociales del tipo aumento formativo (augmenting formative mediante entrenamiento en discriminaciones condicionales

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    Tiberio Pérez-Manrique

    2009-01-01

    "cuidar de sí", establecimiento de la clase funcional "otros", establecimiento de la regla aumento formativo y fase de prueba. Los participantes de la fase experimental pasaron por las cuatro fases del programa mientras que los de la fase control pasaron por las fases 1, 2 y 4. Los resultados evidencian que los participantes que pasaron por la fase experimental derivaron la regla de aumento formativo como producto del entrenamiento en discriminaciones condicionales a partir de la muestra Cuidar y sus comparadores TAX, RAY y JOR, con porcentajes totales de acierto relativo de 88.8%, 72.2% y 94.4%, respectivamente. Estos datos siguieren que es posible el establecimiento de reglas tipo aumento formativo a través de este clase de entrenamiento.

  4. Effect of implant position, angulation, and attachment height on peri-implant bone stress associated with mandibular two-implant overdentures: a finite element analysis.

    Science.gov (United States)

    Hong, Hae Ryong; Pae, Ahran; Kim, Yooseok; Paek, Janghyun; Kim, Hyeong-Seob; Kwon, Kung-Rock

    2012-01-01

    The aim of this study was to analyze and compare the level and distribution of peri-implant bone stresses associated with mandibular two-implant overdentures with different implant positions. Mathematical models of mandibles and overdentures were designed using finite element analysis software. Two intraosseous implants and ball attachment systems were placed in the interforaminal region. The overdenture, which was supported by the two implants, was designed to withstand bilateral and unilateral vertical masticatory loads (total 100 N). In all, eight types of models, which differed according to assigned implant positions, height of attachments, and angulation, were tested: MI (model with implants positioned in the lateral incisor sites), MC (implants in canine sites), MP (implants in premolar sites), MI-Hi (greater height of attachments), MC-M (canine implants placed with mesial inclination), MC-D (canine implants placed with distal inclination), MC-B (canine implants placed with buccal inclination), and MC-L (canine implants placed with lingual inclination). Peri-implant bone stress levels associated with overdentures retained by lateral incisor implants resulted in the lowest stress levels and the highest efficiency in distributing peri-implant stress. MI-Hi showed increased stress levels and decreased efficiency in stress distribution. As the implants were inclined, stress levels increased and the efficiency of stress distribution decreased. Among the inclined models, MC-B showed the lowest stress level and best efficiency in stress distribution. The lowest stress and the best stability of implants in mandibular two-implant overdentures were obtained when implants were inserted in lateral incisor areas with shorter attachments and were placed parallel to the long axes of the teeth.

  5. Novo tipo de evaporímetro terrestre A new type of evaporimeter

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    Rino N. Tosello

    1960-01-01

    Full Text Available No presente trabalho descreve-se um novo tipo de evaporímetro, cujo princípio de funcionamento está baseado em leis físicas que regem o fenômeno de tensão superficial. Neste tipo de evaporímetro a medida da evaporação é feita por processo volumétrieo, dispensando o emprego de mecanismos de precisão e dispendiosos. Foi feita uma análise matemática do princípio de funcionamento do novo evaporímetro, demonstrando-se oferecer exatidão plenamente satisfatória para propósitos práticos. São dados suficientes detalhes construtivos, de instalação e operação, a fim de permitir que pessoas e entidades interessadas possam reproduzi-lo e comprovar as vantagens de seu emprêgo.In this paper is described a new type of evaporimeter, the principle of operation of which is based on physical laws governing the surface tension phenomenon. The measurement of evaporation in, the new evaporimeter, described as Evaporimeter IA-58, is made by simple volumetric procedure, thus avoiding the use of precise and expensive mechanisms. A mathematical analysis of the principle of operation is made, and proves that the new evaporimeter can offer satisfactory xeaults for practical use. The operation of the new evaporimeter is very simple, since only volumetric measurements are made, with a graduated cylinder of 1000 ml, both of the added water to restore the water level to the same initial level and the outflown or excess water. It is believed that enough details are given to allow the understanding of the construction, installation and operation of the new evaporimeter, bo that interested persons or organizations could have the model reproduced and verify the advantage of its use.

  6. Vehículos tipo para el transporte urbano de pasajeros en Colombia

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    Jorge Sánchez Gómez

    1988-01-01

    Full Text Available Con el copatrocinio del Instituto Nacional del Transporte - INTRA Y en el marco del Proyecto de Consumo, Conservación y Sustitución de Energía en el sector transporte, realizado conjuntamente por el Ministerio de Obras Públicas y Transporte, el Ministerio de Minas y Energía, el Departamento Nacional de Planeación y la Organización de Estados Americanos - OEA, la Universidad Nacional de Colombia a través del Instituto de Ensayos e Investigación de la Facultad de Ingeniería desarrolló el estudio "Diseño Optimizado de un Vehículo Diesel de Pasajeros para Operación Urbana en Colombia", comúnmente conocido como "Bus Tipo". En una primera parte se analiza cuales son las características predominantes en el transporte colectivo de pasajeros en las trece (13 principales ciudades colombianas teniendo en cuenta los aspectos del equipo, de la infraestructura y de la estructura o sistema de transporte; en la segunda parte se proponen soluciones para cada uno de los principales problemas encontrados en los aspectos considerados y en la tercera parte se hace la especificación de las principales características técnicas de tres (3 buses tipo o patrón en los tamaños mediano y grande de acuerdo con las normas internacionales. El estudio se complementa con un programa de mantenimiento y con cuatro (4 modelos matemáticos sobre comportamiento mecánico de los buses.

  7. Autopsia verbal en hombres adultos con diabetes tipo 2: estudio cualitativo

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    Geu Mendoza-Catalán

    2017-09-01

    Full Text Available Introducción: La diabetes mellitus tipo 2 (DMT2 es un padecimiento crónico cuya incidencia se incrementa en forma alarmante. El objetivo fue identificar los factores asociados al no autocuidado en hombres con muerte prematura y diagnóstico de DMT2. Materiales y Métodos: Se realizaron seis entrevistas cualitativas a familiares de hombres con DMT2 que fallecieron por complicaciones de su enfermedad, utilizando la metodología de la autopsia verbal. Los resultados se analizaron mediante el análisis de contenido. Resultados: Dentro de los factores que surgieron como limitantes para el autocuidado fueron: la negación de la DMT2, el trabajo, el machismo, preferencia en los alimentos, apoyo familiar, el consumo de alcohol, el consumo de tabaco y la depresión. Discusión: Los hombres con DMT2 se ven influenciados por diversas circunstancias que limitan cuidarse, atenderse y por consiguiente presentar desventajas de salud, complicaciones e incluso una muerte temprana. Conclusiones: Desde la perspectiva de enfermería los resultados ayudan a comprender el comportamiento de los hombres ante esta enfermedad en donde se requiere cuidado constante, a la par que una conciencia legítima de que no se deja de ser hombre por cuidarse.  Cómo citar este artículo: Mendoza-Catalán G, Gallegos-Cabriales EC, Figueroa-Perea JG. Autopsia verbal en hombres adultos con diabetes tipo 2: estudio cualitativo. Rev Cuid. 2017; 8(3: 1786-98. http://dx.doi.org/10.15649/cuidarte.v8i3.420

  8. PROPUESTA DE REFORZAMIENTO PARA EDIFICACIÓN EDUCATIVA TIPO ANTIGUOII-MOP VENEZUELA

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    J. Yépez

    2016-12-01

    Full Text Available Se presenta en este artículo el estudio de reforzamiento estructural para una edificación de uso educativo, conocida como “Tipo Antiguo II”. La escuela fue construida antes de la creación de la Norma Venezolana Sismorresistente Covenin 1756. Los resultados del análisis estructural demostraron insuficiente capacidad de respuesta ante las solicitaciones de servicio, alta vulnerabilidad ante la acción sísmica y deficiencias en la cantidad y distribución del acero de refuerzo. Por tal motivo se planteó el reforzamiento de la superestructura mediante la construcción de muros tipo panel, verificando su acción sobre el sistema de pilotaje existente. Para el modelaje se emplearon los valores de resistencia del concreto obtenidos en los ensayos destructivos realizados por el laboratorio de materiales del Decanato de Ingeniería Civil de la Universidad Centroccidental Lisandro Alvarado, y los parámetros del suelo provenientes del estudio geotécnico. This article presents the study of structural reinforcement for a building of educational use, known as "Old Type II". The school was built before the creation of the Venezuelan Seismoresistant Covenin 1756. The results of the structural analysis showed insufficient responsiveness to service requests, high vulnerability to seismic action and deficiencies in the quantity and distribution of reinforcing steel. For this reason, the reinforcement of the superstructure was proposed by the construction of panel walls, verifying their action on the existing piloting system. For the modeling, the values of resistance of the concrete obtained in the destructive tests made by the materials laboratory of the School of Civil Engineering of the Universidad Centroccidental Lisandro Alvarado and the soil parameters from the geotechnical study were used.

  9. Estabilidade de produtos de pequi (Caryocar coriaceum Wittm sob congelamento em diferentes tipos de embalagens

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    Joaci Pereira de Souza

    2013-12-01

    Full Text Available Avaliaram-se as características de qualidade de pequi (C. coriaceum congelado e acondicionado em diferentes embalagens, armazenados a -18º C, durante 300 dias. Os frutos, coletados na safra de 2009/2010, foram descascados, obtendo-se assim os caroços, que, após sanificados, foram submetidos a 3 tipos de embalagens: 1 - Cortados em lâminas de aproximadamente 2 mm de espessura de polpa e seladas a vácuo em polietileno de alta densidade (PEAD; 2 - Caroços embalados e selados a vácuo em sacos de PEAD; 3 - Caroços dispostos em bandejas de poliestireno expandido e envoltos por filme plástico. As amostras foram avaliadas aos 0; 60; 120; 180; 240 e 300 dias de armazenamento. Utilizou-se um delineamento inteiramente casualizado, em esquema fatorial, e os resultados foram submetidos a análises de variância e regressão. O congelamento do pequi submetido aos três tipos de acondicionamento foi eficiente na preservação das características de qualidade como: pH, acidez titulável e açúcares totais durante 300 dias de armazenamento. Os teores de carotenoides e polifenóis extraíveis totais mostraram redução acentuada no acondicionamento da polpa a vácuo. A forma mais indicada de congelamento do pequi para a manutenção da cromaticidade é o acondicionamento do caroço a vácuo ou em bandeja com filme de PVC.

  10. Conferencia de consenso: tratamiento de la diabetes tipo 2 en el paciente anciano

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    Gómez Huelgas R

    2013-09-01

    Full Text Available El tratamiento de la diabetes tipo 2 en el anciano representa un importante reto tanto desde el punto de vista clínico como del de la salud pública. El envejecimiento poblacional está condicionando un marcado incremento de la pandemia de diabetes en las personas de edad avanzada. Sin embargo, existen pocas evidencias científicas que apoyen el tratamiento más adecuado de la diabetes en los ancianos. Dada la gran heterogeneidad de la población anciana, que incluye a sujetos con muy diferente capacidad funcional y cognitiva, diversa comorbilidad y con muy diferente expectativa de vida, resulta crucial realizar una valoración global del anciano desde una perspectiva biopsicosocial y abordar integralmente los factores de riesgo vascular, planteando unos objetivos personalizados de control glucémico. En ancianos frágiles o con corta expectativa de vida puede ser razonable mantener un objetivo de HbA1c de 7,6-8,5%. La estrategia terapéutica en el anciano con diabetes tipo 2 debe individualizarse y consensuarse con el paciente y sus cuidadores, en función del objetivo planteado. Mejorar la calidad de vida, preservar la seguridad del paciente y evitar los efectos adversos del tratamiento antidiabético deben ser objetivos básicos. Dada la mayor predisposición de los ancianos a las hipoglucemias y sus graves consecuencias en esta población, deberían priorizarse las terapias antidiabéticas que minimicen el riesgo de episodios hipoglucémicos.

  11. Desempenho de genótipos de algodoeiro sob pressão de bicudo

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    Samuel Campos Abreu

    2013-02-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2013v26n2p77   O objetivo deste estudo foi avaliar o comportamento de cinco genótipos de algodoeiro em condições de infestação de bicudo-do-algodoeiro. O experimento foi realizado em Janaúba-MG, no ano agrícola de 2004/2005. O delineamento experimental adotado foi de blocos casualizados, com quatro repetições. Foram utilizados cinco tratamentos (constituídos pelos seguintes genótipos de algodoeiro: Redenção, Precoce 1, Linhagem experimental, Liça e Alva. A densidade de plantas foi de 88.000 a 100.000 plantas/ha. Na condução da cultura não foram adotados quaisquer métodos de controle de pragas. Foram avaliados o número de capulhos, o rendimento de algodão em caroço, a altura de planta, a massa do capulho, a massa de 100 sementes, a porcentagem de pluma, a época de floração e o número médio de bicudo-do-algodoeiro nos botões florais. As cultivares Alva e Linhagem experimental obtiveram os maiores rendimentos de algodão em caroço, 1.092,5 kg.ha-1 e 922,5 kg.ha-1, respectivamente, comparadas à ‘Redenção’, que apresentou a menor produtividade, 453,6 kg.ha-1. A Linhagem experimental foi a mais infestada, apresentando a maior média de indivíduos, de 1,7 bicudo-do-algodoeiro por planta.

  12. Tipo de Cambio Real entre Córdoba y Buenos Aires

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    Federico Fawaz

    2017-09-01

    Full Text Available El objetivo de este trabajo es estudiar las diferencias en la estructura de precios entre Córdoba y Buenos Aires. En términos generales, el costo de vida más alto en Buenos Aires que en el interior del país. Debido a la alta integración de los mercados regionales nacionales, los bienes transables no presentan grandes discrepancias de precios, las cuales sí se observan en los bienes no transables. Los términos de intercambio y las diferencias de productividad entre regiones, a través de su impacto en los salarios relativos, se destacan como el principal determinante del Tipo de Cambio Real. Aunque en menor medida, las asimetrías en las políticas públicas y las diferencias en las densidades de población, también tienen un impacto sobre la estructura regional de precios.Clasificación JEL: R10.Palabras clave: Tipo de Cambio Real, Mercados Regionales, Córdoba, Buenos Aires. Real Exchange Rate between Cordoba and Buenos Aires AbstractThe objective of this work is to study the differences in the price structure between Córdoba and Buenos Aires. In general terms, the higher cost of living in Buenos Aires than in the interior of the country. Due to the high integration of national regional markets, tradable goods do not present major price discrepancies, which are observed in nontradables. The terms of trade and productivity differences between regions, through their impact on relative wages, stand out as the main determinant of the Real Exchange Rate. To a lesser extent, asymmetries in public policies and differences in population densities also have an impact on the regional price structure.JEL Classification: R10Keywords: Real Exchange Rate, Regional Markets, Cordoba, Buenos Aires.

  13. Escolha de genitores quanto à precocidade e produtividade de feijão tipo carioca

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    Naine Martins do Vale

    2015-02-01

    Full Text Available O objetivo deste trabalho foi avaliar linhagens de feijoeiro promissoras para a seleção de genitores com características de feijão tipo carioca, precoces e de alto potencial produtivo. Avaliaram-se 35 linhagens de feijoeiro, em delineamento de blocos ao acaso com três repetições. Quatro destas linhagens - Goiano Precoce, XAN112, Carioca1070 e Rosinha Precoce - foram selecionadas para compor o grupo 1 do dialelo parcial 4×5, e três - RP1, VC15 e VC33, de ciclo normal, grãos tipo carioca e elevado potencial produtivo - foram utilizadas para compor o grupo 2 do dialelo, juntamente com as cultivares BRSMG Madrepérola e BRS Estilo. Obtiveram-se 20 híbridos que, com seus genitores, foram avaliados na safra da seca de 2013, em Coimbra e Viçosa, MG, em delineamento de blocos ao acaso, com três repetições. A linhagem Goiano Precoce destacou-se quanto à precocidade, com valores de capacidade geral de combinação (CGC negativos e significativos em Viçosa (-3,15 e Coimbra (-3,44. A linhagem RP1 destacou-se quanto ao rendimento de grãos, com valores positivos e significativos de CGC em Viçosa (115 e Coimbra (260. Com base na CGC, a linhagem Goiano Precoce é promissora para utilização como genitora quanto à precocidade, e a RP1, quanto ao aumento no rendimento de grãos.

  14. Tipos de hogar, ciclo de vida familiar y pobreza en Costa Rica 1987-2002

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    Barquero, Jorge

    2004-07-01

    Full Text Available El propósito de este estudio fue el de explorar las condiciones vulnerabilidad sociodemográfica en Costa Rica, a partir del análisis de los cambios en los tipos de hogar y el ciclo de vida de las familias en condiciones de pobreza, utilizando información de las Encuestas de Hogares de 1987, 1994 y 2002. Los principales hallazgos revelan modificaciones importantes en la estructura y composición de los hogares y familias en el periodo de estudio, asociado a cambios en la dinámica sociodemográfica de la sociedad costarricense. La evolución en la incidencia de la pobreza por tipo de hogar muestra que ésta es mayor entre los hogares nucleares que cuentan con hijos y al convertirse en monoparentales. La incidencia es más alta en 1987, se reduce para 1994 y prácticamente se mantiene para el 2002. No obstante que en todas las fases del ciclo de vida familiar la incidencia de la pobreza disminuyó en el periodo 1987-1994, en el periodo más reciente al 2002 la incidencia es mayor en las etapas en que las familias poseen más hijos dependientes menores de 18 años, lo que expone a estas familias a una mayor vulnerabilidad a situaciones de pobreza. Los hogares y familias con mayor riesgo de vulnerabilidad ante la pobreza, se hallaron entre aquellos con mayor cantidad de miembros dependientes menores de edad y jefeados por mujeres. No se encontraron evidencias significativas para afirmar que el estancamiento observado en los niveles de pobreza en el país hasta el 2002, fuese producto de los cambios encontrados en los patrones familiares, aunque ciertamente se hace necesario profundizar el análisis de las interrelaciones entre pobreza y cambios demográficos.

  15. 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.

  16. Soft tissue grafting to improve implant esthetics

    Directory of Open Access Journals (Sweden)

    Moawia M Kassab

    2010-09-01

    Full Text Available Moawia M KassabDivision of Periodontics, Marquette University, School of Dentistry, Milwaukee, WI, USAAbstract: Dental implants are becoming the treatment of choice to replace missing teeth, especially if the adjacent teeth are free of restorations. When minimal bone width is present, implant placement becomes a challenge and often resulting in recession and dehiscence around the implant that leads to subsequent gingival recession. To correct such defect, the author turned to soft tissue autografting and allografting to correct a buccal dehiscence around tooth #24 after a malpositioned implant placed by a different surgeon. A 25-year-old woman presented with the chief complaint of gingival recession and exposure of implant threads around tooth #24. The patient received three soft tissue grafting procedures to augment the gingival tissue. The first surgery included a connective tissue graft to increase the width of the keratinized gingival tissue. The second surgery included the use of autografting (connective tissue graft to coronally position the soft tissue and achieve implant coverage. The third and final surgery included the use of allografting material Alloderm to increase and mask the implant from showing through the gingiva. Healing period was uneventful for the patient. After three surgical procedures, it appears that soft tissue grafting has increased the width and height of the gingiva surrounding the implant. The accomplished thickness of gingival tissue appeared to mask the showing of implant threads through the gingival tissue and allowed for achieving the desired esthetic that the patient desired. The aim of the study is to present a clinical case with soft tissue grafting procedures.Keywords: case report, connective tissue, dental implants, allograft, coronally positioned flap

  17. Tipos de parafasias que presentan un grupo de pacientes afásicos fluentes que acuden a un centro hospitalario

    OpenAIRE

    Aguilar, Angelica; Panaifo, Erika; Paredes, José Alberto

    2013-01-01

    El objetivo de la investigación fue conocer los tipos de parafasias en un grupo de pacientes adultos afásicos fluentes que acuden a un Centro Hospitalario, a través del Test de Boston. La metodología que se utilizó fue descriptivo simple, y el estudio tuvo una duración de 5 meses contando con la participación de 6 pacientes. A través de la presente investigación se logró conocer el tipo de parafasia que presenta cada paciente, encontrando en los resultados que existe una relación entre ...

  18. Niveles de cortisol salival y tipos de personalidad de Grossarth-Maticek y Eysenck: un estudio transcultural

    OpenAIRE

    Camacho-Gutiérrez, Everardo; Vega-Michel, Claudia; Orejudo-Hernández, Santos

    2012-01-01

    Basándonos en la tipología de personalidad de Grossarth-Maticek y Eysenck que relaciona ciertos tipos de personalidad con el padecimiento de enfermedades, en esta investigación se analiza en dos muestras de estudiantes universitarios mexicanos y españoles la relación entre el tipo de personalidad de propensión al cáncer y el de propensión a las enfermedades cardiovasculares y el consumo de tabaco y los niveles de cortisol salival. Un total de 190 estudiantes mexicanos y españoles respondieron...

  19. Experiencia de producción de lechuga americana (Lactuca sativa hidropónica, tipo NFT

    Directory of Open Access Journals (Sweden)

    Laura Brenes-Peralta

    2014-06-01

    En el Centro de Prácticas Docentes e Investigación Agropecuaria de la Escuela de Agronegocios del Instituto Tecnológico de Costa Rica (TEC se cuenta, actualmente, con un sistema de este tipo NFT donde estableció una actividad de fortalecimiento que ha resultado en la observación de ciertas características a partir de la experiencia generada, de la cual se espera fomentar el uso de la hidroponía, así como divulgar información técnica y de buenas prácticas en este tipo de cultivo entre usuarios interesados.

  20. MODELAGEM COMPUTACIONAL DO MÉTODO DE CISALHAMENTO DIRETO COM CONECTOR TIPO PINO COM CABEÇA

    OpenAIRE

    Reis Sales, Marcel Willian; Pereira Júnior, Wanderlei Malaquias; Borja Ferreira, Diego; Mikulaschek, Adriana

    2015-01-01

    Diversos tipos de lajes podem ser usados em estruturas mistas de aço concreto. Entretanto, a laje alveolar é uma boa solução, pois ela reduz a necessidade de escoras permitindo que a estrutura de concreto seja executada com velocidade compatível à estrutura metálica. Este trabalho apresenta uma discussão da ligação de cisalhamento promovida em vigas mistas de aço concreto, por conectores tipo pino com cabeça. A ligação é feita pelo conector e preenchida com concreto, podendo existir ou não ar...