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Sample records for alejados del implante

  1. Resultados alejados del implante miocárdico de células madre en la miocardiopatía chagásica

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    Rubén Carrizo Páez

    2007-01-01

    Full Text Available ObjetivoLa presente investigación clínica persigue evaluar la seguridad y la factibilidad del cardioimplante de células mononucleares de médula ósea, así como analizar los cambios clínicos y de la función ventricular, en pacientes portadores de insuficiencia cardíaca secundaria a miocardiopatía dilatada de origen chagásico sometidos a este procedimiento.Material y métodosLa muestra comprende 5 pacientes consecutivos (3 masculinos con una edad promedio de 55,8 ± 8,1 años, que presentaban insuficiencia cardíaca secundaria a miocardiopatía chagásica. Los datos preoperatorios promedio de estos pacientes indicaban una clase funcional (NYHA de 2,6 ± 0,5, mientras que la fracción del ventrículo izquierdo correspondía al 27,6% ± 5,9%, el diámetro diastólico ventricular izquierdo era de 62,9 ± 6,2 mm y el diámetro sistólico del ventrículo izquierdo era de 49,7 ± 7,6 mm. La suspensión celular obtenida de células mononucleares de la médula ósea contenía 10,6 ± 7 ml con un conteo de 1,43 ± 0,6 (E+08 células con una viabilidad mayor del 95%. Correspondían a la fracción CD34+, 5,07 ± 9,51 (E+06 y a la CD133+, 5,11 ± 4,3 (E+06. La suspensión se inyectó por pulsos en cuatro pacientes por vía intracoronaria y en el quinto por vía transepicárdica en el transcurso de una cirugía (reemplazo valvular mitral, revascularización y colocación de matriz bioartificial degradable.ResultadosA los 17,2 ± 8,8 meses de seguimiento promedio, 4 enfermos se hallaban vivos y en clase funcional I (p < 0,005. Un paciente falleció de muerte súbita a los 17 meses de seguimiento.En este tiempo de evolución no se observaron efectos adversos en ninguno de los pacientes referidos al implante celular. En relación con la fracción de eyección, se notó un incremento a 36,6% ± 2,3% (p < 0,05. Los datos obtenidos en la medición de los diámetros sistólico y diastólico del ventrículo izquierdo no mostraron cambios estad

  2. Superficie del implante como indicador de riesgo en enfermedades periimplantares Implant surface as a risk indicator for peri-implant diseases

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    C.M. Ardila Medina

    2012-12-01

    Full Text Available Las enfermedades periimplantares (EPI son lesiones inflamatorias que se producen en los tejidos alrededor de los implantes. Diferentes hallazgos clínicos han descrito la importancia de los microorganismos en el desarrollo de estas enfermedades. Los indicadores de riesgo para las EPI incluyen periodontitis, diabetes, factores genéticos, hábito de fumar, consumo de alcohol, higiene oral, ausencia de encía queratinizada y superficie del implante. Se ha demostrado que las características de la superficie del implante pueden influir en la tasa y grado de contacto hueso-implante, especialmente aquellos con superficies rugosas que favorecen una mayor integración ósea cuando se comparan con implantes de superficie lisa. Sin embargo, algunos investigadores han demostrado que pilares de implantes con superficies rugosas tienden a acumular más placa que los de superficie lisa. Bajo este contexto, diferentes superficies de implantes pueden influir sobre la microflora periimplantar y posiblemente sobre el proceso inflamatorio alrededor de los implantes. No obstante, el efecto de la superficie del implante y su diseño, sobre la inflamación de los tejidos alrededor del implante es controvertido.The inflammatory lesions that develop in the tissues around implants are collectively recognized as peri-implant diseases. The view that microorganisms play a major role in the development of peri-implant diseases is supported by several clinical findings. Indicator factors for peri-implant diseases including periodontitis, diabetes, genetic traits, poor oral hygiene, smoking, alcohol consumption, absence of keratinized mucosa and implant surface. Several studies have demonstrated that implant surface characteristics can influence the rate and degree of bone to implant contact, especially implants with surface roughness that resulted in greater bone integration compared with smooth surface implants. On the other hand, some authors have demonstrated that

  3. Asociación entre lesión periapical y fracaso del implante. Estudio descriptivo

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    López Martínez, Fanny

    2013-01-01

    En los últimos 25 años el implante dental se ha visto involucrado en una tecnología predecible para el remplazo de los dientes. A pesar de que es un tratamiento predecible, muchas fallas ocurren durante la cicatrización inicial y el primer año de carga y durante el mantenimiento y retención del implante. Objetivo Analizar la prevalencia de periimplantitis y su influencia en el fracaso de implantes, en pacientes tratados con implantes dentales en función ≥ 5 años que acuden a...

  4. Implante de titanio sometido a carga inmediata: Análisis histológico del tejido óseo y evaluación cualitativa y cuantitativa de la superficie del implante

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    M. Corina

    2000-05-01

    Full Text Available Sabemos muy bien que la estabilidad de un implante endo-óseo está ligada a múltiples factores: integridad del sitio del implante, cantidad y calidad del hueso, microtopografía del implante y tiempo de recuperación clínica que permita una buena mineralización de la zona del hueso neoformado que rodea el implante. No todos los autores están de acuerdo en que el implante permanezca completamente sumergido durante la fase de recuperación. Algunos creen que la carga inmediata sobre los implantes acelera la transformación del hueso indiferenciado en hueso laminar denso, el cual resiste mejor a las fuerzas de la masticación. En el caso clínico que expondremos a continuación, el implante con cuello transmucoso colocado en el sitio del incisivo central izquierdo superior fue expuesto a trauma tres meses después de ser insertado. El caso nos permitió examinar la superficie del implante con microscopio electrónico explorador (SEM el cual mostró células similares a osteoblastos. Estos resultados luego fueron confirmados por la biopsia histológica, la cual bajo el microscopio óptico mostró señas de remodelación ósea, es decir indicativas de que el implante se había estabilizado durante el período de curación.It is well known that the stability of an endosseous implant is linked to several factors: integrity of the implant site, size and quality of bone, microtopography of the implant element and time of clínical recovery allowing for good mineralization of the new formed perimplantar bone. Not all authors agree that the implant is fully submerged during recovery. Some believe that the immediate load on implants quickens the transformation of the indifferenziated bone, which is therefore more capable of bearing masticatory loads. In the clinical case shown, the implant with transmucous neck placed in the site of the upper left central tooth was exposed to trauma 3 months after the operation. The case allowed us to examine the

  5. Mantenimiento de la higiene del implante ¿De qué manera?

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    M. Corina

    2000-09-01

    Full Text Available El éxito a largo plazo de la terapia de implantes parece estar fuertemente ligado a un control óptimo de la placa. A este respecto hemos analizado las opiniones expresadas en la literatura correspondiente en relación a los procedimientos de higiene profesional y domiciliaria que debe aplicarse en los pacientes portadores de prótesis sobre implantes. Según muchos autores, estos pacientes deberían someterse a controles regulares con una frecuencia de 3 a 6 meses, de acuerdo a las condiciones de salud de los tejidos periodontales y perimplantarios. Entre la gran variedad de instrumentos tradicionales para los procedimientos de higiene oral, la tendencia actual es aquélla de evitar los instrumentos metálicos por su acción dañina sobre la superficie del implante que conduce a una mayor adhesión de la placa y a posibles alteraciones de la biocompatibilidad del titanio. La tendencia actual es a utilizar los instrumentos de material plástico tipo Teflón (PTFE, con un acción menos agresiva sobre la superficie del implante. En el caso que se muestra, los seis implantes expulsados por el paciente después de un tratamiento con carbonato de litio por síndrome maníaco-depresivo fueron examinados al microscopio electrónico explorador (SEM, que puso en evidencia algunas señas macroscópicas sobre la superficie del cuello y del cuerpo del implante además de micropartículas probablemente de naturaleza plástica. Se supone que dichos micro-residuos derivan de la descamación superficial de las curetas, tal vez agravada también por el ablandamiento que comporta el proceso de esterilización a vapor de las mismas. Aunque los instrumentos de plástico tipo Teflón representan el medio preferido respecto a otros, hoy en día no constituyen el medio ideal.Long term success in implant therapy seems to be c10sely related to optimal plaque control. We have reviewed the recommendations published in the literature concerning professional and home oral

  6. Mantenimiento de la higiene del implante ¿De qué manera?

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    M. Corina

    2000-09-01

    Full Text Available El éxito a largo plazo de la terapia de implantes parece estar fuertemente ligado a un control óptimo de la placa. A este respecto hemos analizado las opiniones expresadas en la literatura correspondiente en relación a los procedimientos de higiene profesional y domiciliaria que debe aplicarse en los pacientes portadores de prótesis sobre implantes. Según muchos autores, estos pacientes deberían someterse a controles regulares con una frecuencia de 3 a 6 meses, de acuerdo a las condiciones de salud de los tejidos periodontales y perimplantarios. Entre la gran variedad de instrumentos tradicionales para los procedimientos de higiene oral, la tendencia actual es aquélla de evitar los instrumentos metálicos por su acción dañina sobre la superficie del implante que conduce a una mayor adhesión de la placa y a posibles alteraciones de la biocompatibilidad del titanio. La tendencia actual es a utilizar los instrumentos de material plástico tipo Teflón (PTFE, con un acción menos agresiva sobre la superficie del implante. En el caso que se muestra, los seis implantes expulsados por el paciente después de un tratamiento con carbonato de litio por síndrome maníaco-depresivo fueron examinados al microscopio electrónico explorador (SEM, que puso en evidencia algunas señas macroscópicas sobre la superficie del cuello y del cuerpo del implante además de micropartículas probablemente de naturaleza plástica. Se supone que dichos micro-residuos derivan de la descamación superficial de las curetas, tal vez agravada también por el ablandamiento que comporta el proceso de esterilización a vapor de las mismas. Aunque los instrumentos de plástico tipo Teflón representan el medio preferido respecto a otros, hoy en día no constituyen el medio ideal.

  7. Influencia en la estabilidad primaria del diseño cervical del implante: ¿presencia o ausencia de microespiras? Estudio in vitro

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    M. Fernández-Roldán Galán

    2012-12-01

    Full Text Available Introducción: La estabilidad del implante es uno de los principales parámetros que influye en el programa de carga del mismo y el resultado del tratamiento. Va a depender de tres factores: el procedimiento quirúrgico empleado, la densidad ósea y el diseño del implante. El objetivo de este trabajo fue comparar la estabilidad inicial en hueso esponjoso y corticoesponjoso de dos implantes, uno con microespiras en la zona cervical y otro sin ellas. Material y método: 31 implantes con microespiras en la zona cervical, Screw Plant de ACE® y 31 implantes con ausencia de estas microespiras, TSV de Zimmer®, del mismo diámetro, longitud y diseño fueron insertados en costillas de vaca, midiéndose posteriormente la estabilidad con el Ostell Mentor®. Resultados: El análisis estadístico con la t de Student tanto en hueso esponjoso (p 0,31 como corticoesponjoso (p 0,52 muestran que no existen diferencias significativas en la estabilidad inicial entre los dos tipos de implantes. Discusión: Los resultados de este estudio no arrojan que existan diferencias significativas en los niveles de Ostell Mentor® entre los implantes TSV de Zimmer® y Screw Plant de ACE®, por lo tanto el hecho diferencial de incorporar microespiras en la zona cervical del implante, no implica por los resultados obtenidos mayor estabilidad primaria. A pesar de estos resultados, se requieren estudios a largo plazo para poder determinar si la existencia de microespiras podría influir en la estabilidad secundaria.

  8. Desplazamiento de un implante dental dentro del seno maxilar durante la segunda fase quirúrgica

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    I Gallego Medina

    2002-07-01

    Full Text Available La rehabilitación bucal de los pacientes con edentulismo parcial o total con implantes dentales tiene amplias indicaciones que en ocasiones se ven limitadas por factores anatómicos y biológicos. Una de las localizaciones en la que frecuentemente puede existir una altura insuficiente de hueso alveolar, ya sea debido a la reabsorción ósea, a la excesiva neumatización del seno maxilar o a ambas causas, es la zona posterior del maxilar superior, lo que además suele ir acompañado de una baja calidad ósea. Todo esto hace que tanto la técnica quirúrgica convencional u otros procedimientos alternativos, como la elevación del seno maxilar, injertos en onlay, el uso de osteotomos y la osteotomia de Le Fort I, sean procedimientos quirúrgicos necesarios en muchas ocasiones para poder solucionar un caso de rehabilitación bucal con implantes. Por otra parte estas técnicas pueden alterar la anatomía y la fisiología del seno maxilar favoreciendo la aparición de complicaciones intra y postquirúrgicas. Una de las posibles complicaciones, aunque rara, es el desplazamiento del implante dentario hacia el seno maxilar durante la segunda fase quirúrgica, como es el caso que describimos en este artículo.The oral rehabilitation of the patients with partial or total edentulism with the use of dental implants has wide applications. In occasions, these applications are limited by anatomical and biological factors. Concretely, the posterior area of the maxilla can have a scarce height of residual ridge, besides a poor bony quality and further pneumatization of the maxillary sinus. All this makes that so much the conventional surgical technique as other alternatíve procedures as sinus lift, onlay graft, the technique with osteotoms and the osteotomy of Le Fort l, be surgical procedures that can change the anatomy and physiology of the maxillary sinus favoring the appearance of complications. One of the possible but rare complications is the displacement

  9. Síncope: Estrategia diagnóstica. Utilidad del Holter Implantable

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    Carlos Escobar Cervantes

    2005-01-01

    Full Text Available Se puede definir el síncope como una pérdida breve y súbita del nivel de conciencia que se asocia a una pérdida del tono postural, con recuperación espontánea. La fisiopatología de todas las formas de síncope consiste en un descenso brusco del flujo sanguíneo cerebral. El síncope es una patología común, invalidante y que se asocia posiblemente a un riesgo de muerte súbita, aunque sus causas son en ocasiones difíciles de determinar y precisa de numerosas pruebas diagnósticas. Una historia clínica cuidadosa junto con una exploración física completa son esenciales en la evaluación del síncope y deben conducir o al menos sugerir el diagnóstico que debe ser confirmado mediante distintas pruebas. El electrocardiograma se recomienda en todos los pacientes, a pesar del bajo rendimiento pues los hallazgos pueden ayudar a tomar decisiones para el manejo inmediato de la causa subyacente (por ejemplo, la implantación de un marcapasos en un bloqueo auriculoventricular completo o para el planteamiento de futuras pruebas diagnósticas. Tras el análisis inicial (historia clínica, exploración física y electrocardiograma las pruebas diagnósticas a realizar se harán según la sospecha clínica. Sin embargo, existe poca información acerca de la utilidad del holter implantable en el manejo diagnóstico del síncope. Este artículo pretende hacer una revisión sobre la evaluación del síncope así como el papel que juega el holter implantable en el manejo diagnóstico del síncope.Syncope is a sudden and brief loss of consciousness associated with a loss of postural tone, with spontaneous recovery. The pathophysiology of all forms of syncope consists of a sudden decrease or a brief cessation of cerebral blood flow. Syncope is common, disabling, and possibly associated with a risk of sudden death, but its causes are difficult to diagnose. Consequently, syncope often leads to hospital admission, multiple consultations, and the performance

  10. Síncope: Estrategia diagnóstica. Utilidad del Holter Implantable

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    Carlos Escobar Cervantes

    2005-01-01

    Full Text Available Se puede definir el síncope como una pérdida breve y súbita del nivel de conciencia que se asocia a una pérdida del tono postural, con recuperación espontánea. La fisiopatología de todas las formas de síncope consiste en un descenso brusco del flujo sanguíneo cerebral. El síncope es una patología común, invalidante y que se asocia posiblemente a un riesgo de muerte súbita, aunque sus causas son en ocasiones difíciles de determinar y precisa de numerosas pruebas diagnósticas. Una historia clínica cuidadosa junto con una exploración física completa son esenciales en la evaluación del síncope y deben conducir o al menos sugerir el diagnóstico que debe ser confirmado mediante distintas pruebas. El electrocardiograma se recomienda en todos los pacientes, a pesar del bajo rendimiento pues los hallazgos pueden ayudar a tomar decisiones para el manejo inmediato de la causa subyacente (por ejemplo, la implantación de un marcapasos en un bloqueo auriculoventricular completo o para el planteamiento de futuras pruebas diagnósticas. Tras el análisis inicial (historia clínica, exploración física y electrocardiograma las pruebas diagnósticas a realizar se harán según la sospecha clínica. Sin embargo, existe poca información acerca de la utilidad del holter implantable en el manejo diagnóstico del síncope. Este artículo pretende hacer una revisión sobre la evaluación del síncope así como el papel que juega el holter implantable en el manejo diagnóstico del síncope.

  11. Influencia en la estabilidad primaria del diseño cervical del implante: ¿presencia o ausencia de microespiras? Estudio in vitro Influence in the primary stability the implant neck design: presence or absence of microthreads? Study in vitro

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    M. Fernández-Roldán Galán

    2012-12-01

    Full Text Available Introducción: La estabilidad del implante es uno de los principales parámetros que influye en el programa de carga del mismo y el resultado del tratamiento. Va a depender de tres factores: el procedimiento quirúrgico empleado, la densidad ósea y el diseño del implante. El objetivo de este trabajo fue comparar la estabilidad inicial en hueso esponjoso y corticoesponjoso de dos implantes, uno con microespiras en la zona cervical y otro sin ellas. Material y método: 31 implantes con microespiras en la zona cervical, Screw Plant de ACE® y 31 implantes con ausencia de estas microespiras, TSV de Zimmer®, del mismo diámetro, longitud y diseño fueron insertados en costillas de vaca, midiéndose posteriormente la estabilidad con el Ostell Mentor®. Resultados: El análisis estadístico con la t de Student tanto en hueso esponjoso (p 0,31 como corticoesponjoso (p 0,52 muestran que no existen diferencias significativas en la estabilidad inicial entre los dos tipos de implantes. Discusión: Los resultados de este estudio no arrojan que existan diferencias significativas en los niveles de Ostell Mentor® entre los implantes TSV de Zimmer® y Screw Plant de ACE®, por lo tanto el hecho diferencial de incorporar microespiras en la zona cervical del implante, no implica por los resultados obtenidos mayor estabilidad primaria. A pesar de estos resultados, se requieren estudios a largo plazo para poder determinar si la existencia de microespiras podría influir en la estabilidad secundaria.Introduction: The stability of implant is the main parameter who has a great influence in the implant loading program and the treatment result. It depends on three factors: surgical process, bony density and implant design. The objective of the present study was to compare the initial stability on cancellous and cortico-cancellous bone of two implants, one of them who has microthreads in the neck zone and the other one without them. Material and methods: 31 with

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

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    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

  13. La elevación del seno maxilar en el tratamiento con implantes dentales: un estudio a 4 años

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    A. Jiménez Guerra

    2015-12-01

    Full Text Available Introducción: El objetivo del presente estudio era mostrar los resultados de la elevación del seno maxilar con biomateriales en el tratamiento con implantes del maxilar posterior. Métodos: 70 pacientes edéntulos parciales fueron tratados con 181 implantes Galimplant® con superficie arenada y grabada con ácidos para la rehabilitación del maxilar posterior mediante la técnica de elevación de seno y relleno con betafosfato tricálcico (Osteoblast®. Los implantes fueron cargados después de un periodo de cicatrización de 6-8 meses. Resultados: Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 98,4%. Tres implantes se perdieron durante el periodo de cicatrización. El 85,1% de los implantes fueron insertados simultáneamente a la elevación del seno maxilar. Después de un periodo medio de carga funcional de 57,4 meses, no ha habido complicaciones tardías. El 22,4% de los implantes fueron restaurados con coronas unitarias y el 77,6% con puentes fijos. Conclusiones: Este estudio indica que la rehabilitación del maxilar posterior con implantes mediante la técnica de elevación del seno maxilar constituye un tratamiento dental exitoso.

  14. Alternativas a la elevación de seno maxilar: rehabilitación del sector posterior del maxilar atrófico mediante implantes pterigoideos Alternatives to maxillary sinus lift: posterior area of the atrophic maxilla rehabilitation by means pterigoideal implants

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    X. Rodríguez-Ciurana

    2008-12-01

    Full Text Available El primer y segundo molar son los dientes que se pierden más a menudo debido a la enfermedad periodontal y al exceso de fuerzas oclusales. A pesar de la frecuencia del edentulismo parcial del sector posterior raramente se ubican los implantes más allá de los premolares debido al aumento del índice de fallos. El escaso volumen óseo y la pobre mineralización del sector posterior del maxilar comprometen la viabilidad de las rehabilitaciones con implantes a largo plazo. Además, la cresta ósea a nivel del seno maxilar, en el maxilar atrófico, no suele permitir el anclaje de implantes de 10 mm. Se han propuesto varias técnicas para rehabilitar el sector posterior del maxilar atrófico: implantes cortos, extensiones protésicas, injerto sinusal, implante cigomático. El implante pterigoideo es otro de los posibles tratamientos para rehabilitar el sector posterior del maxilar atrófico. Anclado en el hueso cortical de la apófisis del esfenoides el implante pterigoideo evita la necesidad de injertar o utilizar extensiones protésicas. El objetivo de este artículo es analizar las indicaciones, la técnica, complicaciones y supervivencia del implante pterigoideo en el sector posterior del maxilar atrófico.The first and second molar are the teeth most commonly lost in the maxilla, mainly due to periodontal disease and excessive occlusal force. 1 Although partial edentulism of the posterior maxilla is common, implants are seldom placed distal to the premolars because failure rates in the posterior maxilla have historically been high. Poor volume and low density of bone are the worst conditions for long-term anchorage in the maxilla. 7 Moreover, bone under the maxillary sinus, in the atrophic maxilla, is usually insufficient to enable placement of 10 mm implants. Several techniques have been proposed to restore the atrophic posterior maxilla: short implants, prosthetic cantilevers, sinus bone graft, zigomatic fixtures. Pterygoid implants are

  15. Inserción de implantes dentales en la apófisis pterigoides: Una alternativa en el tratamiento rehabilitador del maxilar posterior atrófico

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    L. Mateos

    2002-04-01

    Full Text Available Existe una alta tasa de fracasos en el tratamiento con implantes del maxilar superior reabsorbido, así como aquéllos insertados en zonas de hueso tipo IV (hueso cortical delgado que rodea a hueso trabecular de baja densidad. Sin embargo, existe una mayor predictibilidad en la colocación de implantes en la apófisis pterigoides, justificando sus indicaciones en aquellos casos donde existe un pronóstico incierto si se insertan las fijaciones en un maxilar de las características antes mencionadas. El uso de implantes en la apófisis pterigoides tienen una tasa de éxito similar a la de los implantes usados en otras áreas del maxilar superior, proporcionando una importante ayuda a la estabilización de la prótesis sobre implantes, lo que otorga una ventaja biomecánica a este tipo de rehabilitaciones. El objetivo de este trabajo es realizar una revisión sobre el procedimiento y la anatomía de la zona, analizando los conceptos de anatomía aplicada del maxilar posterior a la terapéutica con implantes y desarrollando un protocolo quirúrgico para la inserción de fijaciones intraóseas en la apófisis pterigoides, estableciendo las consideraciones protésicas para la carga de los implantes situados en esta región. El protocolo quirúrgico incluye el anclaje cortical del implante en la lámina pterigoidea. Para alcanzar este objetivo, el implante deberá insertarse con una cierta angulación respecto al plano oclusal, relacionándose en su colocación con los huesos maxilar superior, palatino, y la apófisis pterigoides del hueso esfenoides. Por su parte, el protocolo protésico también presenta variaciones, como la toma de impresiones del implante en vez del pilar transepitelial, entre otros. Estos cambios favorecen las condiciones biomecánicas y funcionales de los implantes, haciendo posible el éxito a largo plazo de los mismos.There is a high failure rate in implants placed in the posterior atrophic maxilla. That also occurs with those

  16. Implante de progenitores neurales en un modelo de lesión del sistema oculomotor

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    Morado Díaz, Camilo José

    2015-01-01

    Falta palabras clave El implante de células progenitoras neurales en el sistema nervioso central lesionado es una poderosa herramienta reparadora. Sin embargo, aún no se han evaluado extensamente los efectos de dichos implantes sobre el patrón de disparo y la sinaptología de las neuronas lesionadas. En este estudio se analizó si los progenitores neurales implantados en el sitio de lesión son capaces de restaurar las características de disparo y las aferencias sinápticas alteradas en las ne...

  17. Técnicas de aumento del reborde alveolar en pacientes receptores de implantes

    NARCIS (Netherlands)

    S. Chen; D. Buser; D. Wismeijer

    2014-01-01

    The ITI Treatment Guide series, a unique compendium of evidence-based treatment methods in implant dentistry in daily practice, written by renowned clinicians, provides a comprehensive overview of various therapeutic options. Using an illustrated step-by-step approach, the ITI Treatment Guide shows

  18. Papel del estrés oxidativo y del tejido adiposo en la pancreatitis aguda experimental

    OpenAIRE

    Pérez Garrido, Salvador

    2013-01-01

    La pancreatitis aguda es un proceso inflamatorio agudo del páncreas con afectación variable de otros tejidos y sistemas orgánicos alejados. La incidencia de la pancreatitis aguda en la Unión Europea y Estados Unidos varía de 5 a 30 casos/100.000/año (Ellis y cols., 2009). La mortalidad en pacientes con pancreatitis aguda es alrededor del 5%, pero este porcentaje aumenta al 17-20% en pacientes con pancreatitis necrotizante (Pandol y cols., 2007). La participación del estrés oxidativo en la ...

  19. Implantes mamarios en el plano subfascial en reemplazo del bolsillo subglandular: un cambio lógico Breast implants in the subfascial plane in replacement of the subglandular pocket: a logical change

    Directory of Open Access Journals (Sweden)

    O.D. Ventura

    2006-03-01

    Full Text Available Desde 1999 hemos cambiado el plano subglandular del bolsillo de los implantes mamarios por el plano subfascial (subaponeurótico. Este plano se halla por debajo de la fascia aponeurótica del músculo pectoral mayor, serrato, oblicuo lateral y recto anterior. Este artículo considera 150 casos implantados en este plano (subfascial. Se utilizaron prótesis de superficie texturada. El abordaje fue por una incisión periareolar inferior. En todos los pacientes se consiguió una excelente cobertura del implante, al igual que una forma y movilidad natural. En ningún caso se observó el desagradable ondulado de cuadrantes superiores, conocido como rippling. Cuatro de ellos presentaron procesos capsulares contráctiles grado II de Baker (2,6%. En el postoperatorio inmediato se registró menor edema y una recuperación más rápida de lo habitual, de acuerdo a nuestra experiencia con los otros procedimientos (submuscular y subglandular. Cuando la elección del bolsillo es subglandular, el plano subfascial parecería ser el lugar lógico de la colocación de los implantes mamarios.Since 1999, the subglandular plane of the pocket has been substituted in our practise for the subfascial (subaponeurotic plane in breast implants. This plane lies underneath the aponeurotic fascia of the pectoralis major , the serratus, the lateral oblique and the rectus anterior muscles. This article describes 150 patients with implants in the subaponeurotic plane and textured surface. Patients were approached through an inferior periareolar incision. Excellent coverage of the implant, as well as natural shape and mobility were achieved in all patients. No ondulation (rippling in the upper half of the breast has been observed. Four patients (2,6% had Baker grade II capsular contracture. In the immediate post-op, less edema and faster-than-usual recovery could be seen versus our experience with other (submuscular and subglandular procedures. When a subglandular pocket is the

  20. Impacto da parada cardíaca induzida nas funções cognitivas após o implante de cardiodesfibrilador Impacto de la parada cardíaca inducida en las funciones cognitivas después del implante de desfibrilador cardiaco Impact of induced cardiac arrest on cognitive function after implantation of a cardioverter-defibrillator

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    Mauro Prado da Silva

    2009-02-01

    1980 y se considera el tratamiento estándar para individuos bajo el riesgo de desarrollar arritmias ventriculares fatales. Con el interés de garantizar el funcionamiento adecuado del desfibrilador cardiaco, la energía necesaria para el término de la taquicardia ventricular o de la fibrilación ventricular, debe ser determinada durante el implante, siendo este procedimiento llamado test del límite de desfibrilación. Para la realización del test es necesario que se haga la inducción de la fibrilación ventricular, para que el aparato pueda identificar el ritmo cardíaco y tratarlo. El objetivo de este estudio fue verificar la incidencia de disfunción cognitiva 24 horas después del implante del desfibrilador cardiaco. MÉTODO: Se seleccionó una muestra consecutiva de 30 pacientes con indicación de colocación de desfibrilador cardiaco implantable (DCI y 30 pacientes con indicación de implante de marca-paso (MP. Los pacientes fueron evaluados en los siguientes momentos: 24 horas antes de la colocación del DCI o MP con ficha de evaluación preanestésica, Mini-Examen del Estado Mental (MEEM y Confusion Assessment Method (CAM. Durante el implante del DCI o MP fueron medidas las variables: número de paradas cardíacas y tiempo total de parada cardíaca. Veinte y cuatro horas después de la colocación del DCI o MP, se evaluaron las variables: MEEM y CAM. RESULTADOS: El test de Fisher mostró que no había diferencia de la frecuencia de puntuaciones alteradas del MEEM y del CAM entre los grupos antes y después de los implantes. El tiempo promedio de PCR 7,06, con máximos y mínimos de 15,1 y 4,7 segundos. CONCLUSIONES: La inducción de parada cardíaca durante el test del límite de desfibrilación, no conllevó a la disfunción cognitiva veinte y cuatro horas después del implante del desfibrilador cardiaco.BACKGROUND AND OBJECTIVES: Implantable cardioverter-defibrillators (ICD were introduced in clinical practice in 1980 and they are considered the standard

  1. Influência do macheamento na interface do parafuso e do tecido ósseo na fase imediata pós-implante Influencia del taladramiento en la interfase del tornillo y del tejido óseo durante la fase inmediata post implante The influence of tapping techniques on the interface bone screw/bone tissue in immediate postoperative period

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    Fabiano Pinheiro de Lemos Masson

    2009-06-01

    el orificio proximal derecho fue realizado el taladramiento antes de la inserción del tornillo cortical de 3.5 mm (Grupo A, en el orificio proximal izquierdo el tornillo fue insertado sin taladramiento (Grupo B y los otros dos orificios distales fueron utilizados como controles (Grupo C. Las alteraciones de la interfase entre el hueso y el implante fueron analizadas por medio de un estudio histomorfométrico, teniendo en cuenta el número de trabéculas fracturadas entre los filetes de rosca; la mayor distancia de la fractura trabecular transversal provocada por la inserción del tornillo; la mayor extensión de la fractura trabecular longitudinal provocada por la inserción del tornillo y la línea de contacto en la interfase hueso-tornillo. RESULTADOS: taladrar el orificio piloto ha provocado alteraciones de la microestructura del tejido óseo alrededor del implante cuando comparado con las alteraciones producidas por la inserción del tornillo sin el taladramiento o el orificio piloto. La evaluación del contacto entre el hueso y el implante fue el parámetro que presentó diferencia estadística en la comparación entre la colocación del implante con o sin taladramiento. CONCLUSIÓN: al comparar con el orificio control, todos los parámetros presentaron diferencia estadística.OBJECTIVE: to analyze experimentally the early alterations of the bone-screw interface with tapping techniques in the cancellous bone of the cervical vertebrae. METHODS: five wooless sheep (Santa Inês were analyzed. Pilot holes of 2.5 mm were performed at both sides of the third cervical vertebrae in the proximal and distal portion. The tapping process was done in the right proximal hole before the 3.5 mm screw insertion (Group A, while the left proximal hole was not tapped (Group B and the two distal holes were used as control (Group C. The interface alterations between bone and screw were analyzed through histomorphometric study, considering the number of trabeculae fractures between

  2. Evaluación de implantes de norgestomet reutilizados en protocolos de sincronización del estro en vacas Brahman

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    Luis Uribe-Velásquez

    2013-03-01

    Full Text Available Objetivo. Evaluar las concentraciones de progesterona, la manifestación de estro y las tasas de preñez en vacas Bos indicus sometidas a varios protocolos de sincronización del estro con un implante de norgestomet usado previamente. Materiales y métodos. Sesenta vacas recibieron un implante auricular de norgestomet reutilizado y fueron distribuidas en uno de cuatro protocolos: (1 benzoato de estradiol (BE + progesterona (P4 + prostaglandina F2α (PG (BE+P4+PG; (2 valerato de estradiol (VE + norgestomet (NG (VE+NG; (3 el mismo protocolo BE+P4+PG, asociado con 400 UI de gonadotropina coriónica equina (eCG (BE+P4+PG+eCG; (4 el mismo protocolo VE+NG, asociado con 400 UI de eCG (VE+NG+eCG. El implante fue removido el día 9, con inseminación artificial (IA 12 horas después de la detección del estro. La preñez fue diagnosticada 45 días después de la IA. Las muestras de sangre fueron tomadas los días 0, 4 y 9 (después de colocar el implante para el análisis de progesterona por RIA. Resultados. En el día 4, las concentraciones de progesterona fueron menores en vacas tratadas con BE+P4+PG (0.90 ± 0.73 ng/ml; p0.05. Conclusiones. Los implantes de norgestomet reutilizados fueron eficaces para sincronizar el estro y alcanzar tasas de preñez adecuadas en vacas Brahman.

  3. Técnicas quirúrgicas complejas en el tratamiento con implantes oseointegrados del maxilar superior: Un seguimiento clínico de dos años Advanced surgery techniques in the treatment with osseointegrated implants of maxilla: A 2-year follow up

    Directory of Open Access Journals (Sweden)

    O Pérez Pérez

    2006-04-01

    Full Text Available Introducción. El objetivo del presente estudio era valorar los resultados clínicos del tratamiento con implantes oseointegrados en el maxilar superior con técnicas quirúrgicas complejas. Pacientes y métodos. 51 pacientes fueron tratados con 93 implantes Microdent® con superficie con chorreado de arena y grabada con ácidos para la rehabilitación del maxilar superior mediante la técnica de elevación de seno, expansión ósea e injertos óseos. Los implantes fueron cargados después de un periodo de cicatrización de 6 meses y fueron evaluados más de 2 años. Resultados. 37 pacientes (72,5% fueron tratados mediante elevación del seno maxilar. 8 pacientes (15,6% fueron tratados mediante la técnica de expansión ósea y 6 pacientes (11,7% con injertos óseos. El 83,3% de los implantes fueron insertados en el sector posterior maxilar. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 96,8%, ya que 3 implantes se perdieron durante el periodo de cicatrización. Conclusiones. Este estudio indica que el tratamiento mediante técnicas quirúrgicas complejas del maxilar superior con implantes oseointegrados constituye un tratamiento odontológico con una elevada tasa de éxito.Introduction. The aim of this study was to assess the clinical outcome of implant therapy of maxilla by advanced surgery techniques. Methods. 51 patients were treated with 93 Microdent® sandblasted-etched surface implants for rehabilitation of maxilla by sinus floor augmentation, expansion technique and bone grafts. Implants were loaded after a healing free-loading period of 6 months with a followup at least of 24 months. Results. 37 patients (72.5% were treated by sinus floor augmentation, 8 patients (15.6% were treated by expansion technique and 6 patients (11.7% with bone grafts. 83.3% of implants were inserted in posterior maxilla. Clinical findings showed a survival and success rate of implants of 96.8%, because 3 implants were lost

  4. Complicaciones del implante de marcapaso definitivo: ¿Un evento operador dependiente? Análisis de 743 pacientes consecutivos

    OpenAIRE

    Femenía,Francisco J.; Arce,Mauricio; Peñafort,Fernando; Arrieta, Martín; Gutiérrez,Daniel

    2010-01-01

    La frecuencia de complicaciones relacionadas al implante de marcapasos, es variable y se encuentra entre 6% a 9 %, y existen diferentes factores relacionados con las mismas. Objetivos: Evaluar las distintas complicaciones relacionadas con el implante de marcapasos y determinar cuáles son los factores de riesgo independientes que las predisponen. Métodos: Análisis descriptivo, tipo casos-controles, retrospectivo y prospectivo, correspondiente a 743 consecutivos, con implante de marcapasos defi...

  5. Reacción glial tras el implante de precursores neurales en un modelo de lesión del sistema nervioso central

    OpenAIRE

    Talaverón Aguilocho, Rocío

    2015-01-01

    En el cerebro adulto existen dos regiones con capacidad neurogénica, el giro dentado del hipocampo y la zona subventricular (ZSV). Las células precursoras neurales (CPNs) de la ZSV generan neuroblastos que migran al bulbo olfatorio donde se diferencian a interneuronas. Estas CPNs se pueden aislar y amplificar en cultivo. Se ha demostrado que el implante de CPNs en el cerebro lesionado tiene capacidad terapéutica, de manera que se restauran alteraciones morfológicas y fisiológicas derivadas d...

  6. Estudio mediante elementos finitos del comportamiento biomecánico de diferentes interfases implante-pilar e influencia de la pérdida de hueso periimplantario

    OpenAIRE

    Bouazza Juanes, Kheira

    2015-01-01

    Tesis inédita presentada en la Universidad Europea de Madrid. Facultad de Ciencias Biomédicas. Programa de Doctorado en Odontología Avanzada El proceso de la osteointegración ha permitido que hoy en día los tratamientos implantológicos sean altamente predecibles. Sin embargo, los estudios en los últimos años se centran, entre otros, en averiguar las causas por las cuáles, una vez integrado el implante en el hueso, se llevan a cabo una serie de procesos que conllevan la pérdida del hueso pe...

  7. Triunfo y ocaso del viejo arte de narrar historias. De la gran pantalla a la oralidad: denuncia literaria de la des-legitimación del narrador

    OpenAIRE

    Gatti, Giuseppe

    2014-01-01

    El narrador chileno Hernán Rivera Letelier (Talca, 1950) presenta en su más reciente novela, "La contadora de películas" (2009), una trama que propone –en una primera instancia– una visión sesgada del vínculo tradicional entre literatura, cine y fabulación (en este caso, transposición del texto fílmico a formas de narración oral). Desde su incipit, el relato –ubicado en un alejado pueblo minero del interior norteño de Chile– parece consolidarse como un homenaje a dos formas de "arte", ambas a...

  8. El hándicap del transporte aéreo para el desarrollo inicial del turismo de masas en las Islas Canarias

    OpenAIRE

    Hernández Luis, José Ángel; Armengol Martín, Matilde; González Morales, Alejandro; Sobral García, Silvia

    2011-01-01

    El transporte aéreo, más aún en un territorio fragmentado y alejado como es el caso del Archipiélago canario, ha jugado un papel trascendental para el desarrollo del turismo de masas en los años sesenta y setenta. En efecto, sin la llegada del motor a reacción a Canarias, no se podría comprender el espectacular desarrollo turístico que las Islas experimentaron en este periodo, siendo el principal objetivo de este trabajo, abordar —aunque de forma sucinta—, este proceso absoluta...

  9. La utilización del beta-fosfato tricálcico como biomaterial en implantología oral Implant treatment by fixed prostheses in completely edentulous mandible patients

    Directory of Open Access Journals (Sweden)

    E Velasco Ortega

    2007-12-01

    Full Text Available Introducción. El objetivo del presente estudio era mostrar los resultados del tratamiento con implantes dentales insertados en diversas situaciones clínicas utilizando un biomaterial de relleno óseo. Métodos.43 pacientes con pérdidas dentales fueron tratados con 171 implantes Microdent®. En todos los casos, como biomaterial para regeneración ósea se utilizó el beta-fosfato tricálcico KeraOs®. Los implantes fueron cargados después de un periodo de cicatrización de 6 meses. Resultados. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 98,8%. 2 implantes se perdieron durante el periodo de cicatrización. En el 67,4% de los pacientes se realizó técnica de elevación sinusal, en el 18,6% de los pacientes se realizaron implantes postextracción y en el 14%, los implantes fueron insertados en rebordes alveolares atróficos. Después de un periodo de carga funcional de 12 meses, no ha habido complicaciones tardías. El 54% de las prótesis realizadas fueron puentes fijos; el 28% coronas unitarias; el 14% rehabilitaciones completas fijas y el 4% sobredentaduras. Conclusiones. Este estudio indica que el beta-fosfato tricálcico puede ser utilizado con éxito como material de regeneración ósea en el tratamiento con implantes dentales.Introduction. The aim of this study was to report the outcome of treatment with dental implants inserted in different clinical situations with use of biomaterial of bone regeneration. Methods. 43 patients with tooth loss were treated with 171 Microdent®. In all cases, beta-tricalcium phosphate KeraOs® were used. Implants were loaded after a healing free-loading period of 6 months. Results. Clinical results indicate a survival and success rate of implants of 98,8%. 2 implants were lost during the healing period. After a functioning period of 12 months, no late complications were reported. 54% of implant-supported prostheses were fixed bridges; 28% were single crowns; 14% were

  10. Ecotest mamario: una nueva herramienta para la elección del plano de ubicación de los implantes

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    Guillermo Siemienczuk

    2016-03-01

    Full Text Available Antecedentes y Objetivos. Para obtener los mejores resultados en mastoplastia de aumento con implantes, independientemente del volumen y la forma de los mismos, es necesaria la correcta elección del bolsillo de colocación. Para definir el plano apropiado, hasta ahora, nosotros usábamos el clásico test del pellizco (pinch test siguiendo la corriente bibliográfica mundial. Material y Método. El hecho de que esta medición puede resultar subjetiva y variable debido a las diferentes presiones ejercidas al ser realizado por distintos cirujanos, sumado a que no permite ver lo que realmente estamos pinzando, nos ha llevado a desarrollar la idea de medirlo fiel y objetivamente por medio de un estudio ecográfico preoperatorio al que denominamos ecotest del polo superior. Resultados. Con ésta nueva herramienta diagnóstica hemos evaluado a 95 pacientes, con un seguimiento mínimo de 6 meses de postoperatorio. Conclusiones. De este modo comprobamos la mejoría en nuestros resultados estéticos.

  11. Resultados alejados de la resección local transanal para cánceres de recto bajo bien seleccionados Results of long-term follow-up after local excision for well-selected low rectal cancers

    Directory of Open Access Journals (Sweden)

    J. Contreras

    2007-04-01

    Full Text Available Objetivo: evaluar nuestros Resultados alejados en términos de recidiva local, rescate y sobrevida libre de enfermedad. Método: veintiún pacientes con un cáncer de recto bajo fueron sometidos a una resección transanal completa en un periodo de 18 años (1985-2003. La estadificación preoperatoria incluyó hallazgos clínicos y endoscópicos, estudios por imágenes e histopatológicos. Los especímenes resecados correspondieron a 4 tumores T1, 13 T2 y 4 T3. Los 4 pacientes T1 sólo fueron tratados con cirugía; 6 de los 13 T2 y todos los T3 recibieron quimiorradioterapia postoperatoria. Ninguno de ellos recibió una cirugía radical secuencial. Resultados: el seguimiento (media 75 meses registró 5 casos (23,8% de recidiva total y 4 (19% con falla local (3 T2 de los cuales sólo uno había recibido terapia coadyuvante y un T3 también tratado con quimiorradioterapia. Los cuatro pacientes con recidiva local accedieron a cirugía de rescate, una amputación abdominoperineal en dos casos y a una re-resección local en los otros. Dos de ellos volvieron a recidivar. La sobrevida a 5 años fue de 95,2%, y la sobrevida libre de enfermedad en el mismo periodo alcanzó a un 90,4%. En el periodo de observación hasta agosto de 2006 hay dos pacientes que fallecieron diseminados, y sólo un paciente vivo está recidivado. Conclusiones: esta experiencia confirma que la resección local transanal para cáncer de recto bajo es una buena alternativa en pacientes adecuadamente seleccionados. En tumores T2, la quimiorradioterapia adyuvante será necesaria; en tumores T3, la cirugía radical de rescate debería ser realizada oportunamente.Objective: to evaluate our results about local failure, total recurrence and survival. Method: twenty-one patients underwent a complete local transanal excision for low rectal cancer in our institution during an 18-year period (1985-2003. Preoperative staging included clinical, endoscopic, CT, EUSR, and histopathological

  12. Estudio del efecto de diferentes agentes antibacterianos en biofilms orales in vitro formados sobre distintas superficies de implantes dentales

    OpenAIRE

    Meireles Rodrigues, Rita de Cássia

    2014-01-01

    Antecedentes y objetivos: Se ha demostrado que las bacterias orales organizadas en biofilm están implicadas en la etiología y el desarrollo de las enfermedades peri-implantarias, como son la mucositis y la peri-implantitis, asociadas al uso de implantes dentales. Aún hoy en día no se ha llegado a un consenso en cuanto al material más favorable para evitar el desarrollo de la infección o el tratamiento más adecuado para combatirla.El objetivo de este trabajo ha sido evaluar el comportamient...

  13. Aplicación del shot peening en implantes dentales de titanio para la mejora de la osteointegración

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    Aparicio, C.

    1998-05-01

    Full Text Available In order to optimize the implant-bone fixation, different shot peening treatments with different shot particles (TiO2, Al2O3 y SiC. La rugosidad, SiC have been made. The influence that each type of shot particle has in the bone colonization on the different treatment surfaces has been determined by means of osteoblast-like cells culture. Commercially pure titanium discs have been shot peened. Their qualitative and quantitative surface roughness have been characterized; as well as their surface contamination caused by the shot particles. Particle size has also been determined, before and after the treatment, in order to evaluate their breaking averages. Finally, a TiO2 shot particles manufacture process by sintering has been developed. The manufacture has been necessary since this type of shot particles are not available in the market with the adequate size.

    Con el propósito de optimizar la fijación entre el implante y el hueso, se han realizado tratamientos de shot peening con distintos tipos de partículas de proyección: TiO2, Al2O3 y SiC. La rugosidad superficial obtenida será colonizada por hueso neoformado que producirá un anclaje implante-hueso. Para valorar la influencia que cada tipo de material abrasivo tiene en la colonización del hueso sobre las superficies tratadas, se han realizado ensayos in vitro de cultivos osteoblásticos. El shot peening se ha llevado a cabo en discos de titanio comercialmente puro, sobre los que se ha caracterizado cuantitativa y cualitativamente la rugosidad después del tratamiento; así como la contaminación de la superficie por las partículas. También se ha determinado el tamaño de las partículas, antes y después del tratamiento, para valorar sus porcentajes de rotura. Finalmente, se ha propuesto un proceso de fabricación de partículas de TiO2 por sinterización en el laboratorio

  14. Implantes cono Morse con sistema de indexación interno: Descripción del caso clínico Morse taper interface with prosthetic index: Clinical case presentation

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    G Thomé

    2011-08-01

    Full Text Available El empleo de implantes cono Morse con indexadores para instalación con torque interno sería una opción interesante para el diseño de un implante dentario, que incluso podría traer más opciones protéticas a ese sistema ya que el índex interno también puede utilizarse como una referencia para las restauraciones. El objetivo de este artículo es describir un caso clínico con empleo de implantes cono Morse y un sistema de indexación interno, que evitaría el uso de un montador externo que ya venga adaptado de fábrica. La técnica de cirugía sin colgajo asociada al implante cono Morse con indexador hexagonal interno demostró ser un procedimiento seguro para rehabilitación del área edéntula posterior del maxilar.The use of Morse Taper implants with index to the installation with internal torque should be an interesting option to the design of a dental implant, It could even bring more prosthetic solutions to this system by the fact that the internal index could also be used as a reference for restorations. This article aims to describe a clinical case with the use of Morse Taper implants and a system of internal index, avoiding the use of an external mount, which already comes adapted from factory. The technique of flapless surgery associated to the Morse Taper implant with internal hex index demonstrated to be a safe procedure to the rehabilitation of the posterior edentulous region in the jaw.

  15. Estudio clínico del sistema Locator® en pacientes portadores de sobredentaduras sobre implantes

    OpenAIRE

    Fernández Estevan, Lucía

    2013-01-01

    1. Introducción. Los pacientes edéntulos son un grupo poblacional considerable y con necesidades terapéuticas. Las sobredentaduras retenidas sobre implantes son una adecuada alternativa, sobre todo a nivel mandibular, mejorando el comportamiento de las tradicionales prótesis completas removibles. Además las sobredentaduras suponen una mejora en la calidad de vida oral de los pacientes desdentados. 2. Objetivos. Los objetivos planteados en el presente trabajo fueron los si...

  16. METODOLOGÍA PARA UN ESTUDIO DIALECTAL URBANO: EL CASO DEL ESTUDIO DEL ESPAÑOL DE BUCARAMANGA

    OpenAIRE

    Luz Mary Rincón

    2007-01-01

    Una constante preocupación de los estudiosos de la lengua es el desarrollo de técnicas confiables en la investigación del habla en contextos urbanos con el fin de ofrecer una teoría de la lengua como se observa en su uso social. Para esto hay que tener en cuenta el aporte de la sociolingüística en el estudio de la lengua en su contexto social y toda aquella gama de contribuciones que se han alejado de las tradicionales técnicas usadas en dialectología. En el presente artículo se da cuenta de ...

  17. Estudio del grado de satisfacción en pacientes edéntulos totales tratados con implantes

    Directory of Open Access Journals (Sweden)

    Regina Mestre Aspa

    2001-07-01

    Full Text Available El objetivo de este estudio fue evaluar el grado de satisfacción de los pacientes edéntulos totales tratados en nuestro servicio mediante implantes dentales y la colocación posterior de una prótesis implantosoportada (sobre dentadura o prótesis fija. Para evaluar el grado de satisfacción se realizó una encuesta telefónica con seis preguntas: 1 ¿Siente algún tipo de dolor en los implantes? 2 ¿Tiene algún problema cuando habla? 3 ¿Se atreve a reír con esta prótesis? 4 ¿Puede comer cómodamente? 5 ¿Está satisfecho en general con el tratamiento recibido y el resultado de éste? 6 ¿Repetiría el tratamiento? Para cuantificar la satisfacción de los pacientes se valoraron de forma individual y de forma conjunta las respuestas a estas preguntas. De los datos obtenidos destacaremos que el 65% de los pacientes encuestados estaban satisfechos con el tratamiento recibido y con el resultado de éste, independientemente de si estos eran portadores de una prótesis fija o de una sobre dentadura. También el 65% de los pacientes repetirían el tratamiento. Mediante el test de c2 (grado de significación pThe aim of this study was to evaluate the satisfaction rate of total edentolous patients treated in our service with dental implants and the placement of a posterior implant-supported prothesis (overdenture or fixed. To evaluate the satisfaction we realize a telephonic inquest with six questions: 1 Do you feel any type of pain in your implants? 2 Do you have any trouble speaking? 3 Can you laugh with your prothesis? 4 Can you eat comfortably? 5 Are you satisfied in general with the treatment recieved and with its result? 6 Could you repeat the treatment? Toquantifie the satisfaction of the patients we value each answer individually and also all conjunctly. As a results, we obteined that 65% of patients were satisfied with the treatment and with its result, independently of the prothesis type they wear. Also a 65% of patients would repeat the

  18. Implantes transcigomáticos Traszygomatic implants

    Directory of Open Access Journals (Sweden)

    B. Fernández Ateca

    2004-12-01

    Full Text Available Los implantes cigomáticos, originariamente diseñados por Branemark en 1989, son implantes de cabeza en 45 grados, de 4'5 milímetros de diámetro en su parte más ancha, y que pueden medir entre 30 y 50 milímetros de longitud. Se insertan desde la parte palatina del proceso alveolar, siguiendo la cresta cigomática-alveolar hasta anclarse en el cuerpo del malar, y en el caso de pacientes maxilectomizados, entrando directamente en el cuerpo del malar. Estos implantes ofrecen una alternativa más al cirujano en el momento de planificar un tratamiento protésico-rehabilitador implantosoportado. Sobretodo, en aquellos pacientes con un maxilar superior atrófico en el que no se pueden realizar injertos óseos o estos han fracasado. El objetivo de este artículo es proponer el protocolo quirúrgico de colocación de los implantes trascigomáticos y revisar la literatura actual sobre la evolución clínica de estos implantes.The zygomatic implants, originally designed by Branemark in 1989, are implants with a 45 degree inclined head, 4'5 millimetre diameter at their widest part and measuring between 30 and 50 millimetres in length. They are inserted from the palatine side of the alveolar process, following the zygomatic-alveolar edge and anchor in the body of the zygomatic bone. In the case of maxillectomized patients, they are inserted directly in the body of the malar bone. These implants offer an additional alternative to the surgeon when planning an implant supported rehabilitation treatment; specially in those patients with an atrophic maxilla in which osseous grafts cannot be realized or these grafts have failed. The objective of this article is to propose the surgical,protocol of placement of traszygomatic implants and to check the current literature on the clinical evolution of these implants.

  19. Conductores de valor de la prensa digital con estrategias de pago por contenidos: análisis de caso del Financial Times, The Times y El Mundo en Orbyt

    Directory of Open Access Journals (Sweden)

    Manuel Goyanes-Martínez

    2013-01-01

    Full Text Available El análisis de los conductores de valor (value drivers ha estado tradicionalmente alejado de los principales estudios sobre creación de valor de la prensa en Internet. El objetivo de la presente investigación es aportar un poco de luz a este respecto a través del análisis de tres organizaciones con estrategias de pago por contenidos: Financial Times, The Times y El Mundo en Orbyt.

  20. Artrodesis del raquis cervical por vía anterior con placa atornillada: criterios para la selección del implante

    OpenAIRE

    Barberá, José; Barberá, D.

    2005-01-01

    El propósito de esta revisión es analizar el mecanismo de acción de las placas utilizadas en la artrodesis instrumentada del raquis cervical por vía anterior, con el fin de llegar a un criterio que sirva para seleccionar aquella que sea más adecuada para cada tipo de patología. Se identifican cinco tipos de placas cuyo factor diferencial es la relación mecánica entre el tornillo y el orificio de la placa. Con este criterio se consideran cinco tipos de placa: 1º la de interfaz tornillo-placa l...

  1. Implantología oral guiada asistida por ordenador en el tratamiento del paciente edéntulo mandibular Computer-guided implant dentistry in the treatment of mandibular edentulous patient

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2011-04-01

    Full Text Available Introducción. El objetivo del presente trabajo era presentar el protocolo diagnóstico y quirúrgico y protésico del tratamiento con implantes mediante la técnica guiada en el tratamiento de la mandíbula. La cirugía guiada y la carga inmediata de los implantes para la rehabilitación de la mandíbula incluye el diagnóstico por imagen (TAC con un programa interactivo 3D para la planificación del tratamiento. Las imágenes interactivas 3D fueron obtenidas para la planificación del tratamiento. Según las imágenes 3D, una férula estereolitográfica fue confeccionada para realizar una técnica quirúrgica sin colgajo. Después de un fresado preciso algunos implantes fueron insertados de acuerdo al protocolo clínico. La prótesis fija inmediata provisional fue realizada y ajustada sobre los pilares, evaluando su oclusión. La prótesis fija definitiva se realizó después de un periodo de 3 meses. Conclusiones. Este estudio indica que la implantología oral guiada puede constituir una terapéutica exitosa de la mandíbula edéntula.Introduction. The aim of this paper was to present the diagnosis, surgical and prosthetic protocol of implants by guided technique in the treatment of mandible. Guided surgery and immediate functional loading of dental implants for rehabilitation of mandible include an imaging diagnosis (dental scan with 3D interactive software for planning treatment. According 3D imaging, stereolitographic template were fabricated for a flapless surgical technique. After a accuraced drilling some implants are inserted with a distribution according treatment planning. Immediate transitional fixed prosthesis were realized and adjusted with the abutment and finally, oclussion is evaluated. Definitive fixed prosthesis is realized after a 3 month-period of time. Conclusions. This paper indicate that guided implant dentistry may constitute a successful treatment of edentulous mandible.

  2. El patrimonio y el estado en la formación de la identidad cultural de Chile: desarrollo del concepto de patrimonio y su apropiación por la sociedad chilena en los siglos XIX y XX

    OpenAIRE

    Cabeza Monteira, Ángel Emilio

    2016-01-01

    El patrimonio natural y cultural de América tiene una particular significación a nivel mundial. Es el último continente en ser poblado por la Humanidad. Por miles de años estuvo alejado de las influencias del resto del mundo hasta que la conquista y colonización europea, iniciada hace cinco siglos, alteró radicalmente su entorno natural y cultural.El patrimonio americano comienza a ser valorado como factor de desarrollo, no solo en el campo de las identidades, de la cultura y del turismo, si...

  3. El Asociacionismo y las necesidades socioeducativas en los Centros de Mayores del municipio de Murcia

    OpenAIRE

    Miñano Jiménez, Luis

    2006-01-01

    Se trataba de explorar la realidad de las personas mayores, recoger sus opiniones, actitudes, vivencias y valoraciones sobre su participación social, desde los parámetros que ofrece la educación social, alejados del asistencialismo. La metodología utilizada es cualitativa, a través de entrevistas semiestructuradas a los mayores. Pretendiendo una utilidad práctica de la investigación desde el trabajo de los educadores sociales. Todo ello enmarcado en las grandes transformaciones que este colec...

  4. “COOPEDALEANDO”: UNA ACTIVIDAD FÍSICA EN BICICLETA PARA NIÑOS Y NIÑAS CON TRASTORNOS DEL ESPECTRO AUTISTA

    OpenAIRE

    Irene María Villalba Urbaneja,; Nicolás Julio Bores Calle

    2015-01-01

    Las personas con necesidades educativas especiales, particularmente con Trastornos del Espectro Autista (TEA), se han sentido alejados de las actividades físicas y lúdicas, a pesar de que la legislación vigente exige tenerlos en cuenta (Ley Orgánica 2/2006).El autismo es “una de las alteraciones más graves del desarrollo durante la primera infancia que constituye uno de los problemas más serios desde el punto de vista personal, familiar y social” (Crespo, 2001). Según señala el DSM-IV-TR (200...

  5. Volume study pre and post-implant brachytherapy prostate for establishment of PTV margins; Estudio de volumenes pre y post-implante en braquiterapia de prostata para establecimiento de margenes del PTV

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez Dominguez, M.; Carrasco Herrera, M.; Baeza Trujillo, M.; Herrador Cordoba, M.

    2011-07-01

    Treatment of prostate cancer by permanent implantation of radioactive seeds is now a good alternative to radical surgery or radiotherapy, as it provides a good tumor control while the risk is reduced by a lower complication irradiation of adjacent healthy organs. The large volume change during seed implantation occurs in the prostate of the patient, makes it important to consider margins around the organs of interest both to ensure optimal coverage and minimal tumor irradiation of healthy tissue. Analyze how the volume varies during and after implantation and establish a margin around the prostate to the practice of our hospital are the two objectives of this work.

  6. Evaluación y preparación psicológicas de los pacientes candidatos a terapias implantables para tratamiento del dolor crónico Evaluation and psychological preparation of the patient candidates to implantables therapies for treatment of chronic pain

    Directory of Open Access Journals (Sweden)

    L. A. Merayo

    2007-12-01

    Full Text Available Las técnicas de neuroestimulación eléctrica Junto con las técnicas de infusión intratecal de fármacos, son el abordaje de elección para el tratamiento del dolor crónico refractario a otras terapias. La selección indiscriminada de pacientes, o la evaluación incompleta de éstos, conduce a un mayor número de fracasos del implante y por tanto de la terapia. La mayoría de expertos coinciden en que los factores psicológicos del paciente con dolor crónico deberían ser evaluados como parte de la intervención terapéutica antes y después de la realización de técnica en el marco de un abordaje multidisciplinar. En este artículo proponemos que además de la valoración se debería realizar la preparación psicológica de los pacientes para que afronten esta situación y obtener un mayor beneficio terapéutico. Se aborda también el papel que desempeña el psicólogo dentro del equipo, por qué es importante realizar una evaluación psicológica, cómo y cuándo debería tener lugar, así como las características específicas de ambas técnicas de neuromodulación. Creemos que la preparación psicológica del paciente con dolor crónico candidato al tratamiento mediante sistemas implantables podría ser un objetivo importante a tener en cuenta antes y después de las técnicas de implante para aquellos pacientes con mejor pronóstico de adaptación.Electric neurostimulation techniques along with intrathecal drugs infusión techniques are of choice for the treatment of chronic pain refractory to other therapies. An indiscriminate selection of patients, or their incomplete assessment, leads to increase the rate of implantation failure, and therefore of therapeutic failures. Most of experts agreed that psychological factors of the patient with chronic pain should be evaluated as part of the interventional pain management before and after to carry out the implant in the frame of a multidisciplinary approach. In this article, we propose to

  7. Carmustine Implant

    Science.gov (United States)

    Carmustine implant is used along with surgery and sometimes radiation therapy to treat malignant glioma (a certain type of ... Carmustine implant comes as a small wafer that is placed in the brain by a doctor during surgery to ...

  8. Goserelin Implant

    Science.gov (United States)

    Goserelin implant is used in combination with radiation therapy and other medications to treat localized prostate cancer and is ... treatment of abnormal bleeding of the uterus. Goserelin implant is in a class of medications called gonadotropin- ...

  9. Efter cochlear implant

    DEFF Research Database (Denmark)

    Højen, Anders

    2007-01-01

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

  10. 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...

  11. Quality control of system of imaging for rectal ultrasound for implants seed prostate low rate; Control de calidad del sistem de imagen por ecografia rectal para implantes de semillas de prostata de baja tasa

    Energy Technology Data Exchange (ETDEWEB)

    Luquero Llopis, N.; Ferrer Gracia, C.; Huertas Martinez, C.; Huerga Cabrerizo, C.; Corredoira Silva, E.; Serrada Hierro, A.

    2013-07-01

    In this work, the objective is the evaluation of the image system used in implants of prostate of low rate held at our hospital, for maximum control on the placement of the seeds in the patient and therefore carried out dosimetry. (Author)

  12. Complementary method of analyzing the quality of the implant I-125 seeds for prostate brachytherapy using ultrasound imaging post-implant; Metodo complementario de analisis de la calidad del implante de semillas de I-125 para braquiterapia de prostata mediante la adquisicion de imagenes ecograficas post-implante

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez Dominguez, M.; Carrasco Herrera, M.; Baeza Trujillo, M.; Herrador Cordoba, M.

    2011-07-01

    In this paper we propose a complementary method based on Longitudinal mode ultrasound images acquired the same day of surgery, at the end of the implant. This option will allow us to evaluate the dosimetry end of treatment with the patient in the same position he was planning and to the rectum and bladder just as full. This will permit the identification of bodies and the seeds of interest more easily and will have a reference with which to compare one month later, when the CT images can also detect whether there has been some migration.

  13. Anatomía comparada del leño de Eucalyptus camaldulensis (Myrtaceae de dos orígenes, ensayados en Santiago del Estero Comparative wood anatomy of two select origins of Eucalyptus camaldulensis (Myrtaceae, implanted in Santiago del Estero, Argentine Chaco Region

    Directory of Open Access Journals (Sweden)

    Juana Graciela Moglia

    2008-12-01

    Full Text Available El objetivo del presente trabajo fue estudiar la variabilidad radial en el leño de ejemplares de Eucalyptus camaldulensis Dehnh. provenientes de dos orígenes selectos implantados en un ensayo en Santiago del Estero. Se compararon materiales provenientes del Huerto Semillero de Zimbabwe y de Emu Creek Queensland. Se estudiaron las secciones transversales de fuste a 1,30 m de altura de 7 ejemplares de 5 años de edad, de cada uno de los orígenes. Se extrajeron dos probetas sobre el radio Norte, tomadas una a 25% y otra al 80% de distancia con respecto a la médula. Se analizaron: frecuencia y diámetro de vasos, longitud de vasos y fibras, porcentaje de tejidos, tipos de vasos y radios. El análisis de la varianza se ajustó al diseño de muestreo de efectos anidados para «orígenes» y «árboles», utilizando las «distancias radiales a la médula» como medidas repetidas y se evaluó con un modelo mixto. Los dos orígenes estudiados presentan porosidad difusa, vasos solitarios y radios homogéneos. Ninguna de las variables estudiadas mostró diferencias significativas entre orígenes. Las longitudes de vasos y fibras mostraron diferencias significativas entre distancias. La frecuencia y longitud de vasos, frecuencia de radios y los porcentajes de tejidos mostraron diferencias significativas entre árboles.The aim of the present research was to study radial wood variation of two different origins in Eucalyptus camaldulensis Dehnh. proceeding from a seed allotment in Zimbabwe and Emu Creek Queensland. For this study seven trees of 5 years old, of each origin, were selected from an implanted trial in Santiago del Estero. Two samples were taken from transverse sections at 1.30 m height on the North radius, one located at 25% and the other at 80% of distance to the pith. Frequency, diameter, and length of vessels, fiber length, tissues percentages and ray types were analyzed. Univariate analysis was performed using a nested design, for

  14. Entre el Cielo y la Tierra. La Filosofía del Derecho de Jean Bodin y Thomas Hobbes

    Directory of Open Access Journals (Sweden)

    Misael Flores Vega

    2006-01-01

    Full Text Available Jean Bodin y Thomas Hobbes son dos filósofos de la política que preconizaron al Estado absolutista durante el siglo XVI, con ello sentaron los cimientos del moderno Estado europeo. Con el afán de edificar el Estado, su filosofía jurídica se enfocó a buscar el orden social mediante la instauración de un monarca absoluto que dictara leyes para encontrar obediencia. Bodin propone un monarca absoluto que se supeditara a Dios, mientras Hobbes plantea un monarca absoluto alejado del Poder divino. Las leyes que propone Bodin se originan de la voluntad de Dios, y en Hobbes las leyes provienen de la voluntad del Estado.

  15. ¡Alucinados por paisajes! Indicadores para una relectura del paisaje regional

    Directory of Open Access Journals (Sweden)

    Fabio Aldemar Gómez Sierra

    2011-10-01

    Full Text Available Otra forma de administrar las localidades en la globalización, es la vinculación del paisaje con las expresiones culturales. Ese, depende de las miradas naturales o fotografiadas, sometidas ambas a la subjetividad. La acepción aplicada al entorno, se expresa como espectáculo rural, dotado de patrimonios, cuyas concepciones poéticas, románticas y turísticas, obstaculizan más posibilidades. Aunque al departamento de Boyacá se le identifique parcialmente como territorio de paisajes, dicho concepto, alejado de las categorías científicas es pasivo y contemplativo. Enriquecerlo con miradas y procedimientos fundamentados, desde la experiencia de los paisajes vitícolas y hablar de la ciencia del paisaje, articulada con disciplinas científicas y aplicadas, permitiría la movilidad de conocimientos y por ende, una transformación social.

  16. Cochlear Implants

    Science.gov (United States)

    ... on this topic can be found in our Audiology Information Series [PDF]. How does a cochlear implant ... speech-language pathologists; speech, language, and hearing scientists; audiology and speech-language pathology support personnel; and students. ...

  17. Oseointegración en implantes Bicon® cargados a los tres meses después de haber sido colocados mediante la técnica de elevación interna del seno maxilar en pacientes atendidos en la facultad de odontología de la universidad de Cartagena

    Directory of Open Access Journals (Sweden)

    Lorena Meñaca

    2013-10-01

    Full Text Available ResumenObjetivo: El objetivo general de este estudio fue evaluar la oseointegración en implantes tipo Bicon® cargados a los tres meses de colocados, mediante la técnica de elevación interna de seno maxilar. Materiales y Métodos: Este estudio se establece como una investigación de tipo descriptivo, basado en una serie de casos clínicos tratados. En la recolección de la información se utilizó un instrumento en donde se registraron los datos personales de los pacientes, se realizó la toma de radiografías panorámicas iniciales y radiografías periapicales utilizadas para observar la neoformación ósea y medir el aumento del piso del seno maxilar. La información fue consignada y tabulada en tablas y gráficos de frecuencia. Resultados: De los implantes colocados ninguno presentó movilidad ni patologías perimplantares, el piso del seno maxilar se aumentó en promedio 2.6 mm y se presentó neoformación ósea adecuada a los tres meses, lo que permitió la carga de los implantes. Conclusiones: Se determinó que a los tres meses se logra una suficiente oseointegración con los implantes, que en conjunto con la elevación interna del piso del seno maxilar y el grado de neoformación ósea alcanzado dieron a los implantes las condiciones necesarias para poder cargar los mismos. Además, la ausencia total de lesiones perimplantarias señalan el cumplimiento estricto de las normas tecnoquirurgicas, evaluación e instrucción a los pacientes que se han estado manejando dentro del proceso de la colocación de los implantes Bicon®. (Duazary 2007; 2: 93 - 99AbstractObjective: The general objective of this investigation was to evaluate the oseointegration of Bicon® dental implants that have been charge after three month of put it with internal sinus lift in maxillary sinus Material and Methods: This investigation has been stablished as a descriptive study, support in clinic cases. In order to recollect the information, a format was used to

  18. EFECTO DEL pH Y EL PESO INICIAL DE IMPLANTE SEMBRADO EN LA MULTIPLICACIÓN CALLOGÉNICA DE CANAVALIA ENSIFORMIS

    Directory of Open Access Journals (Sweden)

    Juan F. Saldarriaga

    2014-01-01

    Full Text Available Este trabajo evalúa el efecto del pH del medio de cultivo en la multiplicación callogénica de Canavalia ensiformis. Con el fin de obtener datos para un crecimiento óptimo de la biomasa callogénica, se determinaron dos rangos de trabajo, el primero comprendido entre 4.5 y 5.5 y el segundo entre 5.5 y 6.0, determinando el efecto que este producía en la multiplicación callogénica. Así mismo, se observó que la cantidad de callo sembrado inicialmente influye en el aumento de la biomasa. Luego de realizar un análisis de varianza a los datos de siembra obtenidos, se encontró que el mejor pH para el medio de cultivo es de 5.5, mientras que el peso del callo a ser sembrado debe ser mayor de 0.2500 gramos, con el fin de realizar una propagación adecuada de C. ensiformis para la obtención de metabolitos de interés comercial.

  19. Cochlear Implant

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    In this text, the authors recall the main principles and data ruling cochlear implants. Then, a first circle of technical equipment for assistance is presented. This circle includes: device setting (DS), Electrically evoked Auditory Brainstem Responses (EABR), Neural Response Telemetry (NRT), Stapedial Reflex (SR) and Electrodogram Acquisition (EA). This first cycle becomes more and more important as children are implanted younger and younger; the amount of data available with this assistance makes necessary the use of models (implicit or explicit) to handle this information. Consequently, this field is more open than ever.

  20. La descentralización a la luz del caso Bella Flor en Ciudad Bolívar, Bogotá

    Directory of Open Access Journals (Sweden)

    Pening G Jean Philippe

    2005-12-01

    Full Text Available En Colombia, las políticas de descentralización se profundizaron con la Constitución Política de 1991 y los desarrollos legislativos posteriores. A los municipios se les devolvió la responsabilidad en inversiones en sectores como educación, salud y agua potable y saneamiento básico. Bogotá presenta los mejores indicadores colombianos, sin embargo en la ciudad conviven hogares que presentan indicadores bastante alejados del promedio de la localidad, de la ciudad y del país. Para demostrarlo, se realizó un censo en el barrio Bella Flor de la localidad de Ciudad Bolívar en Bogotá, el cual arroja unos resultados que comparamos con un censo realizado en 2000 y con resultados de encuestas del DANE.

  1. El tratamiento con implantes dentales postextracción Treatment with postextraction dental implants

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2007-02-01

    Full Text Available Introducción. El objetivo del presente estudio era mostrar los resultados de del tratamiento con implantes dentales insertados inmediatamente después de la extracción. Métodos. 22 pacientes con pérdida dental unitaria, parcial o total fueron tratados con 82 implantes Microdent® con superficie con chorreado de arena y grabada con ácidos. Todos los implantes fueron insertados inmediatamente después de la extracción correspondiente. Los implantes fueron cargados después de un periodo de cicatrización de 3 meses en la mandíbula o 6 meses en el maxilar superior. Resultados. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 97,6%. 2 implantes se perdieron durante el periodo de cicatrización. El 73,2% de los implantes fueron insertados en el maxilar. superior mientras que el 26,8% en la mandíbula. Después de un periodo medio de carga funcional de 12 meses, no ha habido complicaciones tardías. Conclusiones. Este estudio indica que los implantes dentales insertados de forma inmediata después de la extracción pueden constituir una alternativa implantológica predecible y exitosa.Introduction. The aim of this study was to report the outcome of treatment with implant inserted immediately after tooth extraction. Methods. 22 patients with single, partially or totally tooth loss were treated with 82 Microdent® sandblasted-etched surface implants. All implants were inserted immediately after tooth extraction. Implants were loaded after a healing free-loading period of 3 months in mandible or 6 months in maxilla. Results. Clinical results indicate a survival and success rate of implants of 97,6%. 2 implants were lost during the healing period. 73.2% of implants were inserted at maxilla while 26.8% were inserted at mandible. After a functioning period of 12 months, no late complications were reported. Conclusions. This study indicate that dental implants inserted immediately after tooth extraction may constitute a

  2. Cochlear Implants

    Science.gov (United States)

    ... an optimal period to develop speech and language skills. Research has shown that when these children receive a cochlear implant followed by intensive therapy before they are 18 months ... age develop language skills at a rate comparable to children with normal ...

  3. Dental Implants

    Medline Plus

    Full Text Available ... suffer from social consequences and poor nutrition. Rebuilding Bone When the supporting alveolar bone melts away , it’s gone for good, but through grafting, a skilled dental professional can recreate bone to fuse with and support an implant. This ...

  4. Cochlear implant

    Science.gov (United States)

    ... are sent along the auditory nerve to the brain. A deaf person does not have a functioning inner ear. A cochlear implant tries to replace the function of the inner ear by ... signals to the brain. Sound is picked up by a microphone worn ...

  5. Dental Implants

    Medline Plus

    Full Text Available Dental Implants A fuller, more complete smile is within reach. The following information is designed to provide helpful facts so you ... found in nature. What Happens When You Lose a Tooth? When you lose a tooth, especially a ...

  6. Dental Implants

    Medline Plus

    Full Text Available ... an implant connects directly to the jaw bone. It’s obviously not the same as the original connection , ... may feel you don’t need to replace it, since no one can see that it’s missing ...

  7. 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.

  8. Cochlear implants

    OpenAIRE

    Despotović, Adrijana

    2011-01-01

    The aim of the thesis is to analyze the performance of the child with cochlear implant (CI) at language, math and movement activities. For the purpose of research exercises from all three above mentioned activities are prepared. Results of the exercises constitute the ground for the comparison of a child with CI and children with no hearing disability. Testing language skills was performed with exercises that included understanding, diction and identifying syllables. Mathematic skills...

  9. 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.

  10. Breast reconstruction - implants

    Science.gov (United States)

    Breast implants surgery ... wait 1 to 3 months before the permanent breast implant is placed during the second stage. In the ... from your chest and replaces it with a breast implant. This surgery takes 1 to 2 hours. Before ...

  11. Implantable Cardioverter Defibrillator

    Science.gov (United States)

    ... NHLBI on Twitter. What Is an Implantable Cardioverter Defibrillator? An implantable cardioverter defibrillator (ICD) is a small ... pacemakers and defibrillators. Comparison of an Implantable Cardioverter Defibrillator and a Pacemaker The image compares an ICD ...

  12. Nanotechnology and Dental Implants

    OpenAIRE

    Sandrine Lavenus; Guy Louarn; Pierre Layrolle

    2010-01-01

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

  13. 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...

  14. Prevención primaria y secundaria de muerte súbita en un hospital de la Seguridad Social de Costa Rica: reporte del registro de pacientes con desfibrilador automático implantable, 2007-2011 Primary and secondary prevention of sudden cardiac death in a hospital of the social security system in Costa Rica: report from the registry of patients with implantable cardioverter-defibrillators, 2007-2011

    Directory of Open Access Journals (Sweden)

    Hugo Arguedas-Jiménez

    2013-03-01

    Full Text Available Justificación y objetivo: diversos estudios han demostrado la eficacia de los desfibriladores automáticos implantables en la prevención de la muerte súbita cardiaca. La aplicación de dicha evidencia debe ser evaluada mediante registros. El objetivo de este estudio fue describir las principales características epidemiológicas y clínicas y las complicaciones de los pacientes a quienes se les implanta un desfibrilador automático implantable en un hospital de tercer nivel en Costa Rica. Métodos: estudio observacional de cohorte, retrospectivo, que incluyó la totalidad de pacientes a quienes se les implantó un desfibrilador automático implantable en el hospital “Dr. Rafael Ángel Calderón Guardia” entre 2007 y 2011. Resultados: se incluyó 23 pacientes. La edad media fue de 55 ± 18 años. La cardiopatía isquémica fue la etiología más frecuente (10 pacientes. Veinte pacientes estaban en clase funcional I o II; la fracción de eyección media fue 0,38 ± 0,17. En los 18 pacientes el desfibrilador automático se implantó por prevención secundaria. Cinco pacientes presentaron una complicación temprana, todos ellos con dispositivos bicamerales: 2 hematomas menores, una disección del seno coronario, un desplazamiento del electrodo atrial derecho y un ictus cardioembólico. Hubo un total de 101 terapias (en 8 pacientes, de las cuales 94 fueron apropiadas (en 5 pacientes y 7 inapropiadas (en 3 pacientes; dos de estos últimos habían tenido episodios previos de fibrilación atrial. Conclusión: este registro muestra que la mayoría de los implantes de desfibriladores automáticos se realizan por prevención secundaria, con una alta tasa de terapias adecuadas y una baja tasa de terapias inadecuadas y de complicaciones; además, permite evaluar las indicaciones y las complicaciones asociadas con esta terapia.Aim: Several studies have demonstrated the efficacy of implantable cardioverter-defibrillators in the prevention of sudden

  15. Implant success!!!.....simplified

    OpenAIRE

    Luthra Kaushal

    2009-01-01

    The endeavor towards life-like restoration has helped nurture new vistas in the art and science of implant dentistry. The protocol of “restoration-driven implant placement” ensures that the implant is an apical extension of the ideal future restoration and not the opposite. Meticulous pre-implant evaluation of soft and hard tissues, diagnostic cast and use of aesthetic wax-up and radiographic template combined with surgical template can simplify the intricate roadmap for appropriate implant t...

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

    OpenAIRE

    J. González Lagunas

    2008-01-01

    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 impla...

  17. El comportamiento del servicio de transporte colectivo urbano (1950-1989

    Directory of Open Access Journals (Sweden)

    Fidencio Chavira P.

    2009-01-01

    Full Text Available El propósito que se persigue es conocer algunos aspectos importantes, sobre la manera de cómo, a través de las manifestaciones que recogieron dichas fuentes, se percibe el funcionamiento del servicio de TCU de 1950 a la fecha. Con los elementos que se señalan tratamos de proporcionar una idea de la expansión que el transporte fue teniendo con la creación de colonias y sectores cada vez más alejados del centro antiguo de la Ciudad. Dichos elementos son el movimiento de ruteros, el incremento de tarifas, las condiciones del servicio y las condiciones de la vialidad, entre otros. Estos aspectos no fueron seleccionados apriorísticamente, más bien se consideraron por la frecuencia insistente con que se presentaron en el periodo como noticias periodísticas. El Estado, por su parte, al otorgar a diversas organizaciones, como a la empresa privada, las concesiones para la transportación colectiva urbana se desentiende de todas las demás complicaciones que tiene el TCU, y con ello ha motivado situaciones de diversa índole, en lo laboral, en lo tecnológico, en las tarifas, en la atención a la demanda, en la calidad del servicio.

  18. La carga inmediata con implantes Microdent en el maxilar superior: II. Aspectos prostodóncicos Immediate loading with microdent implants in maxilla: II. Prosthetic step

    OpenAIRE

    E. Fornés Ortuño; E. Velasco Ortega; F. Ortega González; A. García Méndez; J.J. Segura Egea

    2007-01-01

    Introducción. El objetivo del presente trabajo era valorar el protocolo protésico de la carga inmediata en el tratamiento con implantes oseointegrados del maxilar superior. La fase protésica de la carga inmediata con implantes para el tratamiento del maxilar edéntulo constituye un complejo protocolo que incluye el objetivo de minimizar los riesgos de cargas oclusales adversas que incrementen la remodelación ósea. El implantólogo debe evaluar la magnitud, la duración y el tipo de las fuerzas, ...

  19. La protección del “paisaje sonoro”: Los toques manuales de campanas y su declaración como Bien de Interés Cultural

    Directory of Open Access Journals (Sweden)

    Francisca Ramón Fernández

    2014-06-01

    Full Text Available En el presente trabajo analizamos la protección de los toques manuales de campanas y su declaración como Bien de Interés Cultural Inmaterial por parte de la legislación de patrimonio cultural valenciano. A través de la evolución histórica del bien podemos observar las razones de su protección y nos ha llevado a cuestionarnos si ha sido adecuado su consideración como paisaje sonoro, concepto muy alejado en el ámbito jurídico y que no es compartido plenamente. Siendo la primera vez que se protege este bien, resulta especialmente interesante la ampliación de la protección a los denominados elementos que forman parte del bien, como es el caso de las partituras.

  20. L'efecte dels camps elèctrics de freqüència extremadament baixa (ELF) en el desfibril·lador automàtic implantable (DAI)

    OpenAIRE

    González Sosa, Jarold Aurelio

    2012-01-01

    Projecte realitzat en el marc d'un programa de mobilitat amb la Tampere University of Technology. [ANGLÈS] Through research and technological advances, modern society has developed a variety of implantable devices that helps to optimize human's life quality. One of these devices is the implantable cardioverter defibrillator (ICD). Our unit, ERP Environmental Health, in previous investigations has found that, in some cases, the ICD receives certain disturbances under the power lines. Theref...

  1. Implant success!!!.....simplified

    Directory of Open Access Journals (Sweden)

    Luthra Kaushal

    2009-01-01

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

  2. Urinary incontinence - injectable implant

    Science.gov (United States)

    Injectable implants are injections of material into the urethra to help control urine leakage ( urinary incontinence ) caused by a ... into the tissue next to the sphincter. The implant procedure is usually done in the hospital. Or ...

  3. Implantable cardioverter defibrillator - discharge

    Science.gov (United States)

    ... medlineplus.gov/ency/patientinstructions/000108.htm Implantable cardioverter defibrillator - discharge To use the sharing features on this ... chest wall. A device called an implantable cardioverter-defibrillator (ICD) was inserted under your skin and muscle. ...

  4. Pacemakers and Implantable Defibrillators

    Science.gov (United States)

    ... need a cardiac pacemaker or an implantable cardioverter defibrillator (ICD). They are devices that are implanted in ... can act as both a pacemaker and a defibrillator. Many ICDs also record the heart's electrical patterns ...

  5. Implantable cardioverter-defibrillator

    Science.gov (United States)

    ... medlineplus.gov/ency/article/007370.htm Implantable cardioverter-defibrillator To use the sharing features on this page, please enable JavaScript. An implantable cardioverter-defibrillator (ICD) is a device that detects any life- ...

  6. Intracochlear misdirected implantation of a cochlear implant

    NARCIS (Netherlands)

    Tange, R A; Grolman, W; Maat, A

    2006-01-01

    This paper discusses a rare complication of an intracochlear misdirection of the electrode of a cochlear implant in a 55-year-old male. The patient received a cochlear implant using the mastoid-saving surgical approach. Intraoperative measurements showed impedance and NRT reactions suggesting a reas

  7. Bloqueio extraconal para facectomia com implante de lente intra-ocular: influência do fentanil associado ao anestésico local na qualidade do bloqueio e na analgesia pós-operatória Bloqueo extraconal para facectomia con implantación de lente intra-ocular: influencia del fentanil asociado al anestésico local en la calidad del bloqueo y en la analgesia pos-operatoria Extraconal block for cataract extraction surgery with implantation of intraocular lens: contribution of fentanyl associated to local anesthetics for quality of block and postoperative analgesia

    Directory of Open Access Journals (Sweden)

    Daniel Espada Lahoz

    2003-09-01

    de analgésicos con fentanil - 20,7%, en el uso de analgésicos con fentanil - 41,5%. CONCLUSIONES: En las condiciones de este estudio el fentanil mejoró la calidad del bloqueo cuanto a la motilidad del músculo recto medial y diminuyó la necesidad de analgésicos en el pos-operatorio.BACKGROUND AND OBJECTIVES: Loco-regional anesthesia for cataract extraction surgery offers as advantages minimum physiological changes, complete anesthesia, eye reflexes blockade, lower incidence of nausea and vomiting and shorter recovery time, in addition to postoperative analgesia. Continuous concern with blockade quality as well as with postoperative analgesia is responsibility of the anesthesiologist. This study aimed at evaluating whether fentanyl has contributed to blockade quality and postoperative analgesia in cataract extraction surgery with implantation of intraocular lens. METHODS: The association of fentanyl and 0.75% bupivacaine for eye blockade and postoperative analgesia was evaluated in 164 patients undergoing cataract extraction with implantation of intraocular lens (extracapsular technique. Patients were homogeneous in gender, demographics, operated eye, ASA physical status and Goldman’s cardiac risk index. Patients were randomly allocated in two groups (82 patients each: with or without fentanyl. Blockade quality was evaluated according to the following parameters: intraoperative pain; eyelid and/or eyeball movement; Bell’s reflex persistence; number of blocks needed to produce akinesia and surgeons evaluation of blockade. Postoperative analgesia was evaluated by patients’ request for additional postoperative analgesia. RESULTS: Results have shown that fentanyl has significantly improved medial rectus muscle blockade quality (with fentanyl - 17.1%; without fentanyl - 32.9% and has decreased postoperative analgesics consumption (analgesics with fentanyl - 20.7%; no analgesics with fentanyl - 41.5%. CONCLUSIONS: In the conditions of this study, fentanyl has

  8. 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

  9. Aranguren y el papel del intelectual

    Directory of Open Access Journals (Sweden)

    Sotelo, Ignacio

    1997-03-01

    Full Text Available Not available

    En muy diferentes escritos -al fin y al cabo, se piensa en las coordenadas del tiempo en que nos ha tocado vivir- José Luis L. Aranguren se ha ocupado de la relación del intelectual con la política, cuestión a la que ha aportado atisbos y enfoques tan originales como esclarecedores, de modo que ya vale la pena resumir lo que ha pensado sobre el tema. Además, su propia obra y sus múltiples actividades, como profesor, publicista y conferenciante incansable, son de tal calibre y enjundia que en base a ellas cabe estudiar de modo paradigmático la influencia del intelectual sobre una España que me permitirá el lector que califique, con la mayor moderación y prudencia, pese a las enormes diferencias, por lo demás obvias, entre el franquismo y el régimen actual, de hosca y bastante difícil en todo momento. Este artículo consta de tres partes: 1. Una breve exposición de los aportes de Aranguren al tema. 2. Una segunda que. trata de desentrañar el tipo de relación que uno de los intelectuales más destacados ha tenido con la sociedad española en estos últimos cincuenta años, caminando en un doble sentido, desde la obra, para esclarecer su impacto real sobre la sociedad española; y desde ésta hacia al intelectual, interesados en mostrar los condicionamientos sociales -se piensa siempre en un contexto social y como reacción a él que configuran su pensamiento. 3. En fin, y a manera de conclusión provisional, algunas observaciones críticas a la tesis de Aranguren de que el intelectual debe permanecer alejado de la órbita del poder y, consecuentemente, de la política concreta.

  10. COCHLEAR IMPLANTATION: MY EXPERIENCE

    Directory of Open Access Journals (Sweden)

    Shankar

    2015-12-01

    Full Text Available Cochlear implant is a small, surgically implanted complex electronic device that can help to provide a sense of sound to a person with severe to profound sensorineural hearing loss. This type of hearing loss, typically involves damage to hair cells in the cochlea, as a result sound cannot reach the auditory nerve which usually receives information from hair cells. A cochlear implant skips the damaged hair cells and to stimulate the auditory nerve directly. An implant does not restore normal hearing, instead it can give a deaf person a useful representation of sounds in the environment and help him or her to understand speech. I am here presenting this article in relation to the indications, intraoperative and postoperative complications of cochlear implantation in our institute since January 2013. Children who receive implants at earlier age, outperform their peers who are implanted at a later age. This is reflected in all the areas of speech and language development.

  11. 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 ...

  12. 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

  13. Dental Implant Systems

    OpenAIRE

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

    2010-01-01

    Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with...

  14. Implantes inmediatos transalveolares tipo IMETI®. Reporte de un caso

    Directory of Open Access Journals (Sweden)

    Joyce Barrios Mejía

    2013-10-01

    Full Text Available ResumenHoy en día existen avances en el concepto de mantenimiento y regeneración ósea. Es bien conocido en el ámbito de la odontología que tras una exodoncia se produce una reabsorción del alveolo residual dentro del mismo proceso de cicatrización y remodelación gingival y ósea, pero para evitar estos inconvenientes se plantean los implantes inmediatos insertados en el mismo acto quirúrgico en el cual se extrae el diente a sustituir. Con respecto a los implantes diferidos, tienen precisamente la ventaja de disminuir la continua reabsorción ósea del alveolo postextracción, acortar el tiempo de tratamiento rehabilitador y evitar segundas cirugías de implantación. El objetivo de este artículo es caracterizar a través de un caso el éxito de esta técnica quirúrgica con la convencional utilizando los implantes tipo IMETI ®. (Duazary 2007; 1: 45 - 51AbstractNow a days exists an advance in the maintenance concept and bony regeneration. is very well-known that after an exodontic a reabsorption of the residual alveolus takes place inside the same scaring process and gingival remodeling and bony, to avoid these inconveniences, it is thought about the immediate implant inserted in the same surgical act in which the tooth to substitute is extracted. With regard the differed implants; they have the advantage of diminishing the continuous bony reabsorption of the alveolus post-extraction, to shorten the time of rehabilitative treatment and to avoid second implantation surgeries. The objective of the present case, is to characterize the success of this surgical technique with the conventional used the IMETI ® implants.Key Words: Extraction; Implant; Alveolus; IMETI ®

  15. HA-Coated Implant

    DEFF Research Database (Denmark)

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

    2014-01-01

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

  16. Temporary ectopic hand implantation

    Directory of Open Access Journals (Sweden)

    Xu Zhang

    2015-03-01

    Full Text Available Severe crushing injuries to the distal forearm can preclude immediate hand replantation, with temporary ectopic implantation as a practicable option under special circumstances. This report describes a case of temporary ectopic hand implantation for a crush injury extending from the wrist to the middle third of the forearm, using the left foot as the recipient site. The hand was replanted onto the left forearm 3 months after the ectopic implantation, with functional gains seen by 18 months. Satisfactory ambulation was retained, with no reported foot pain. Temporary ectopic implantation is a pragmatic alternative under select circumstances.

  17. 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

  18. Pancreatitis aguda: revisión de las nuevas guías del 2013

    Directory of Open Access Journals (Sweden)

    Pablo Orellana Soto

    2014-03-01

    Full Text Available La pancreatitis aguda es una patología que se produce por una inflamación del tejido pancreático y la consecuente liberación de las enzimas producidas por este órgano. Afecta, además del tejido pancreático, tejidos cercanos, produciendo complicaciones locales, y sistemas más alejados, produciendo falla orgánica. Según la evidencia de falla orgánica persistente se define la severidad de la enfermedad. En el 2013 se publicaron las guías actualizadas sobre el diagnóstico y manejo de esta patología por el “American College of Gastroenterology”, donde se analizó más de 150 artículos y se buscó dar recomendaciones según evidencia o criterio de expertos, tomando en cuenta lo avanzado en los últimos años. El objetivo de este artículo es realizar una revisión bibliográfica de estas guías y de otras referencias de relevancia.

  19. ORGANIZACIÓN Y LOGÍSTICA DEL MERCADO FRESERO ONUBENSE

    Directory of Open Access Journals (Sweden)

    Juan A. Márquez Domínguez

    2001-01-01

    Full Text Available La plena integración de España en la Unión Europea, ha expandido y afianzado patrones de consumo interesados por fresas, frambuesas, arándanos y naranjas que constituyen, en una era de la dieta saludable, “la compra impulsiva de todo consumidor” (Kemp, D., 1995... y también el gran negocio de la agricultura de vanguardia, alrededor del cual se agrupan multitud de agentes comerciales con estrategias y visiones de mercado diferentes. Desde hace dos décadas, la Tierra Llana de Huelva, el sector más meridional de la provincia, se está convirtiendo en el espacio indiscutible de la fresa española y europea, siendo la segunda zona productora del mundo, tras California, por obvias ventajas comparativas de índole natural y humana. Sin embargo, el reducido potencial de consumo, por volumen demográfico de los centros de producción de fresas, hace imprescindible contar con mercados externos, alejados cientos y miles de kilómetros. En este contexto, la logística y organización comercial adquiere un papel relevante en la viabilidad de las explotaciones agrarias, ya que de ellas dependen, en gran medida, la rentabilidad económica.

  20. Embellecimiento facial con el "sistema matriz de implante mandibular": abordaje endoscópico Facial beauty "mandibular matrix implant system": endoscopic access

    Directory of Open Access Journals (Sweden)

    O. M. Ramírez

    2007-09-01

    Full Text Available Uno de los problemas estéticos mas frecuentes y de difícil corrección que afectan el tercio inferior facial, es la disarmonía entre los tejidos blandos y las estructuras óseas subyacentes. Las limitaciones de las técnicas convencionales y los escasos resultados estéticos motivaron al autor a desarrollar un sistema de implantes y una técnica de remodelación tridimensional del maxilar inferior, denominada Sistema Matriz de Implante Mandibular. El sistema Matriz de Implante Mandibular se compone de dos unidades bien definidas: un implante genio-mandibular articulado formado por dos segmentos y un implante de ángulo gonial para cada lado. Esta constituido por material biocompatible poroso de alta densidad que permite su remodelación y adaptación a las necesidades estéticas de cada paciente, además de un ensamblaje perfecto a la superficie ósea. Está indicado especialmente para el embellecimiento del contorno facial y puede realizarse conjuntamente con un lifting o como procedimiento único. También se utiliza en pacientes edéntulos o con micrognatia. El abordaje se realiza a través de una pequeña incisión submentoniana que permite introducir los implantes previa disección subperióstica, bajo visión endoscópica del lecho receptor. La elección final del tamaño, proyección y contorno de los implantes se determina después de colocar implantes de prueba y de tallar los implantes definitivos. Una vez implantado el Sistema Matriz Mandibular, se estabiliza con tornillos de fijación en el tercio anterior de los componentes del implante geniomandibular y además por la superposición del borde posterior de éstos con el borde anterior del implante de ángulo gonial. Este último no necesita fijación, ya que queda contenido entre la cincha ptérigo-masetérica y el maxilar inferior (ángulo gonial. En publicaciones previas se estudiaron las complicaciones en 50 casos, incluyendo: un desplazamiento (corregido con reposicionamiento

  1. La carga inmediata con implantes Microdent en el maxilar superior: II. Aspectos prostodóncicos Immediate loading with microdent implants in maxilla: II. Prosthetic step

    Directory of Open Access Journals (Sweden)

    E. Fornés Ortuño

    2007-02-01

    Full Text Available Introducción. El objetivo del presente trabajo era valorar el protocolo protésico de la carga inmediata en el tratamiento con implantes oseointegrados del maxilar superior. La fase protésica de la carga inmediata con implantes para el tratamiento del maxilar edéntulo constituye un complejo protocolo que incluye el objetivo de minimizar los riesgos de cargas oclusales adversas que incrementen la remodelación ósea. El implantólogo debe evaluar la magnitud, la duración y el tipo de las fuerzas, especialmente las situaciones parafuncionales y el bruxismo. La prótesis fija inmediata provisional puede ser elaborada utilizando la férula quirúrgica perforada y rellenada con resina acrílica. Posteriormente, la prótesis es ajustada sobre los implantes y finalmente es evaluada la oclusión. Conclusiones. Este trabajo indica que el protocolo prostodóncico del tratamiento del maxilar superior mediante la carga inmediata de los implantes puede constituir una terapéutica exitosa.Introduction. The aim of this paper was to present prosthodontic aspects of immediate loading of implants in the treatment of maxilla. Prosthetic phase of immediate functional loading of dental implants for rehabilitation of maxilla constitute a complex protocol that include the goal of decrease the risk of occlusal overload that increase the remodelling rate of bone. The dentist must evaluate magnitude, duration and type of forces, especially parafunction and bruxism. Immediate transitional fixed prosthesis may be fabricated by the dentist with a perforated surgical template used for the implant insertion with acrylic material. After, temporary prosthesis is adjusted with the abutment and finally, oclussion is evaluated. Conclusions. This paper indicate that prosthodontic step of treatment of maxilla by immediate loading with osseointegrated implants may constitute a high successful treatment.

  2. Metodología para la Implantación de un Sistema de Medición del Rendimiento Empresarial Methodology for the Implantation of the Enterprises' Performance Measurement System

    Directory of Open Access Journals (Sweden)

    Magali M Matilla

    2007-01-01

    Full Text Available La medición del rendimiento basada en un conjunto de indicadores constituye una técnica para evaluar la eficiencia de una empresa. Este trabajo describe la metodología CMI-IRIS, basada en un Cuadro de Mando Integral, para el diseño e implantación de un sistema de medición del rendimiento, dentro del marco de la integración empresarial, combinando aspectos de carácter estratégicos y tecnológicos. La metodología abarca actividades relacionadas con el marco empresarial, definición y validación del sistema de indicadores, el diseño y mejora de procesos, y la implementación y monitoreo del sistema. Finalmente, se expone la aplicación informática de soporte a la metodología. Esta es capaz de interactuar con los sistemas operacionales de la empresa para controlar el comportamiento del sistema de indicadoresThe performance measurement system based on a set of indicators is a method for evaluating the efficiency of a company. This paper describes the CMI-IRIS methodology for the design and implementation of a control management system inside the ambit of the enterprises’ integration, combining strategic and technological elements. The method includes activities related with the enterprise environment, the definition and validation of the indicator system, the design and improvement of the process, and the implementation and monitoring of the system. Finally, a computer system that supports the methodology is presented. This enables to interact with the operational systems of the company to control the behaviour of the system of indicators

  3. Implantable CMOS Biomedical Devices

    Directory of Open Access Journals (Sweden)

    Toshihiko Noda

    2009-11-01

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

  4. 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

  5. MUSIC AND COCHLEAR IMPLANTS

    Institute of Scientific and Technical Information of China (English)

    Mao Yitao; Xu Li

    2013-01-01

    Currently, most people with modern multichannel cochlear implant systems can understand speech in qui-et environment very well. However, studies in recent decades reported a lack of satisfaction in music percep-tion with cochlear implants. This article reviews the literature on music ability of cochlear implant users by presenting a systematic outline of the capabilities and limitations of cochlear implant recipients with regard to their music perception as well as production. The review also evaluates the similarities and differences be-tween electric hearing and acoustic hearing regarding music perception. We summarize the research results in terms of the individual components of music (e.g., rhythm, pitch, and timbre). Finally, we briefly intro-duce the vocal singing of prelingually-deafened children with cochlear implants as evaluated by acoustic measures.

  6. Dental Implant Systems

    Directory of Open Access Journals (Sweden)

    Yoshiki Oshida

    2010-04-01

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

  7. Paleogeoformas lacustres en los lagos Musters y Colhué huapí, su relación genética con un paleolago Sarmiento previo, centro-sur del Chubut

    Directory of Open Access Journals (Sweden)

    Emilio F González Díaz

    2014-09-01

    Full Text Available El reconocimiento de paleogeoformas lacustres acrecionales y de erosión en la costa este del lago Musters, como así también, en la costa este del adyacente lago Colhué Huapí y fuera del ámbito lagunar al sur del cerro Puricelli en posiciones altimétricas similares, permitió relacionarlas genéticamente a nivel regional, con un cuerpo lagunar previo, aquí denominado Paleolago Sarmiento; generado por la inundación de la depresión preexistente del bajo de Sarmiento, luego de la captura y desvío de las aguas del río Senguerr. Se estimó un máximo nivel para el paleolago Sarmiento de unos 60 m sobre el nivel actual del lago Musters. Las geoformas acrecionales que muestran un arreglo subparalelo y altimetrías declinantes, constituyen un testimonio del progresivo pero intermitente descenso del nivel del paleolago. Se reconocieron tramos de paleocordones en las costas orientales del lago Musters alejados del ámbito del lago en una masiva concentración y con excelente grado de conservación al oeste del bajo del Avestruz; en la Bahía Costa al noroeste del lago Musters; en la costa oriental del lago Colhué Huapí, y lejos del ámbito lacustre, al sur del cerro Puricelli. También paleoacantilados en posiciones más elevadas son relevantes en el extremo austral de la península Baya. Se estima que la extensión del paleolago Sarmiento, en la depresión del bajo de Sarmiento, alcanzó los 4300 km². La concentración de las paleogeoformas sobre las costas orientales es relacionada con la dinámica del oleaje, inducido localmente por intensos y dominantes paleovientos de dirección oeste.

  8. MEMS biomedical implants

    Institute of Scientific and Technical Information of China (English)

    Tai Yuchong

    2012-01-01

    The field of micro-electro-mechanical systems (MEMS) has advanced tremendously for the last 20 years. Most commercially noticeably, the field has successfully advanced from pressure sensors to micro physical sensors, such as accelerometers and gyros, for handheld electronics application. In parallel, MEMS has also advanced into micro total analysis system(TAS) and/or lab-on-a-chip applications. This article would discuss a relatively new but promising future direction towards MEMS biomedical implants. Specifically, Parylene C has been explored to be used as a good MEMS implant material and will be discussed in detail. Demonstrated implant devices, such as retinal and spinal cord implants, are presented in this article.

  9. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

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

    2011-01-01

    Studies of complications following reconstructive surgery with implants among women with breast cancer are needed. As the, to our knowledge, first prospective long-term study we evaluated the occurrence of complications following delayed breast reconstruction separately for one- and two......-stage procedures. From the Danish Registry for Plastic Surgery of the Breast, which has prospectively registered data for women undergoing breast implantations since 1999, we identified 559 women without a history of radiation therapy undergoing 592 delayed breast reconstructions following breast cancer during...... of reoperation was significantly higher following the one-stage procedure. For both procedures, the majority of reoperations were due to asymmetry or displacement of the implant. In conclusion, non-radiated one- and two-stage delayed breast implant reconstructions are associated with substantial risks...

  10. 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....

  11. Superelastic Orthopedic Implant Coatings

    Science.gov (United States)

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

    2014-07-01

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

  12. Cochlear Implant in Adults

    Directory of Open Access Journals (Sweden)

    Jaleh Samadi

    2003-09-01

    Full Text Available Cochlear implant is the result of a great combination and collaboration of engineering and medicine. It is mainly because it has the most conflict with the human nervous system among all prosthesis. Cochlear implant helps a child with profound hearing loss to understand and articulate speech and let an adult person with hearing loss communicate with people by phone. Although these wonderful results could not be seen in all patients, will let us know about the great scientific findings.

  13. BREAST IMPLANT SURFACE DEVELOPMENT

    OpenAIRE

    Valencia Lazenco, Anai Alicia

    2015-01-01

    Bilateral breast augmentation is one of the most common cosmetic surgical procedures carried out on women in the western world. Breast augmentation involves increasing the volume of a woman‘s breasts through surgery by placing a silicone implant in the subglandular or subpectoral cavity. Although a capsule forms inevitably around breast implants as a natural part of healing, it can cause significant morbidity if the capsule becomes firm and contracted, a condition known as breast capsular con...

  14. Simple Implant Augmentation Rhinoplasty.

    Science.gov (United States)

    Nguyen, Anh H; Bartlett, Erica L; Kania, Katarzyna; Bae, Sang Mo

    2015-11-01

    Augmentation rhinoplasty among Asian patients is often performed to improve the height of the nasal dorsum. As the use of autogenous tissues poses certain limitations, alloplastic materials are a viable alternative with a long history of use in Asia. The superiority of one implant prosthesis over another for augmentation rhinoplasty is a matter of debate, with each material representing varying strengths and weaknesses, indications for use, and precautions to consider in nasal implant placement. An implant prosthesis should be used on a case-by-case basis. Augmentation rhinoplasty requires the consideration of specific anatomical preoperative factors, including the external nose, nasal length, nasofrontal angle, humps, and facial proportions. It is equally important to consider several operative guidelines to appropriately shape implants to minimize the occurrence of adverse effects and postoperative complications. The most common postoperative complications include infection, nasal height change, movement of implant prosthesis, and silicone implant protrusion. In addition, the surgeon should consider the current standards of Asian beauty aesthetics to better understand the patient's desired outcome. PMID:26648804

  15. 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

  16. Biomaterials in cochlear implants

    Directory of Open Access Journals (Sweden)

    Lenarz, Thomas

    2009-01-01

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

  17. Del Piero

    OpenAIRE

    Umbaca, Enzo

    2015-01-01

    Rifacendosi al “Pinturicchio”, epiteto con cui Gianni Agnelli consacrava il calciatore Alessandro Del Piero un “artista del calcio”, Enzo Umbaca scrisse al popolare personaggio invitandolo a collaborare ad una performance durante la quale Pinturicchio-Del Piero avrebbe affrescato il muro di una galleria torinese calciando un pallone macchiato di grafite contro un muro sul quale è appesa la copia di un opera del Pinturicchio.

  18. Iatrogenic Tumor Implantation

    Institute of Scientific and Technical Information of China (English)

    Ying Ma; Ping Bai

    2008-01-01

    Iatrogenic tumor implantation is a condition that results from various medical procedures used during diagnosis or treatment of a malignancy. It involves desquamation and dissemination of tumor cells that develop into a local recurrence or distant metastasis from the tumor under treatment. The main clinical feature of the condition is nodules at the operation's porous channel or incision, which is easily diagnosed in accordance with the case history. Final diagnosis can be made based on pathological examination. Tumor implantation may occur in various puncturing porous channels, including a laparoscopic port, abdominal wall incision, and perineal incision, etc. Besides a malignant tumor,implantation potential exists with diseases, such as a borderline tumor and endometriosis etc. Once a tumor implantation is diagnosed, or suspected, surgical resection is usually conducted.During the diagnosis and treatment of diseases, avoiding and reducing iatrogenic implantation and dissemination has been regarded as an important principle for surgical treatment of tumors. In a clinical practice setting, if possible, excisional biopsy should be employed, if a biopsy is needed. Repeated puncturing should be avoided during a paracentesis. In a laparoscopic procedure, the tissue is first put into a sample bag and then is taken out from the point of incision. After a laparoscopic procedure, the peritoneum, abdominal muscular fasciae, and skin should be carefully closed, and/or the punctured porous channel be excised. In addition, the sample/tissue should be rinsed with distilled water before surgical closure of the abdominal cavity,allowing the exfoliated tumor cells to swell and rupture in the hypo-osmolar solution. Then surgical closure can be conducted following a change of gloves and equipment. The extent of hysteromyomectomy should as far as possible be away from the uterine cavity. The purpose of this study is to make clinicians aware of the possibility of tumor implantation

  19. Two Portuguese Cochlear Implanted Dizygotic Twins: A Case Report

    Directory of Open Access Journals (Sweden)

    Joana Rita Chora

    2012-01-01

    Full Text Available Individual’s hearing performance after cochlear implant (CI is variable and depends on different factors such as etiology of deafness, age at implantation, and social/family hearing environment. Here we report the case of dizygotic twins, boy and girl, presenting with neurosensorial profound deafness prior CI (age of implantation = 3.5 years old. Both parents have severe/profound deafness, since childhood, and use sign language as primary mode of communication. Clinical and genetic characterization was performed, as well as the assessment of the auditory and oral (rehabilitation after CI, applying a battery of audiological, speech, and language tests. The twin girl and the father were homozygous for the c.35delG mutation in the GJB2 gene, while the twin boy and the mother were compound heterozygotes, both monoallelic for c.35delG and for the deletion del(GJB6-D13S1830 in the GJB6 gene. The remaining hearing impaired relatives were c.35delG homozygotes. The genetic cause of deafness was thus identified in this family. Some noteworthy differences were observed regarding twins’ auditory and oral performance after CI. Subsequent follow-up of these children allowed us to conclude that those differences were most likely due to the different environment in which the twins have been living than to their different GJB2/GJB6 genotypes.

  20. Tratamiento quirúrgico periimplantario Surgical treatment peri-implantitis

    Directory of Open Access Journals (Sweden)

    A. Ortiz-Vigón Carnicero

    2012-04-01

    Full Text Available Uno de los factores clave del éxito a largo plazo de los implantes dentales es el mantenimiento de la salud de los tejidos entorno a éstos. El biofilm bacteriano es capaz de inducir alteraciones inflamatorias en los tejidos blandos periimplantarios, lo que puede llevar a la destrucción de los mismos, produciendo finalmente el fracaso del implante. Para la prevención de esta patología se han propuesto múltiples estrategias terapéuticas, aunque no se ha evidenciado cual es la más efectiva. Objetivos: Identificar el protocolo terapéutico más efectivo para el tratamiento de la patología periimplantaria en implantes osteointegrados. Conclusión: La cirugía de acceso ha demostrado resolver un 58% de los casos de periimplantitis. Ninguno de los métodos de descontaminación de superficies ha demostrado ser superior a las demás.One of the key factors for the long-term success of oral implants is the maintenance of healthy tissues around them. Bacterial plaque accumulation induces inflammatory changes in the soft tissues surrounding oral implants and it may lead to their progressive destruction (perimplantitis and ultimately to implant failure. Different treatment strategies for perimplantitis have been suggested, however it is unclear which are the most effective. Objectives: To identify the most effective interventions for treating perimplantitis around osseointegrated dental implants. Conclusion: Access surgery has demonstrate that resolution occurred in 58% of the lesions. No single method of surface decontamination was found to be superior.

  1. Imaging for cochlear implants.

    Science.gov (United States)

    Phelps, P D; Annis, J A; Robinson, P J

    1990-07-01

    Insertion of a sound amplification device into the round window niche (extracochlear implant) or into the coils of the cochlea (intracochlear implant) can give significant benefits to some carefully selected, severely deaf patients. Imaging has an essential role in selective and pre-operative assessment. Severe otosclerosis and post-meningitic labyrinthitis ossificans are common causes of deafness in these patients and can be demonstrated by computed tomography (CT). The most suitable side for operation can be assessed. We describe our experiences with 165 patients, 69 of whom were found suitable for implants. Thin (1 mm) section CT in axial and coronal planes is the best imaging investigation of the petrous temporal bones but the place of magnetic resonance scanning to confirm that the inner ear is fluid-filled and polytomography to show a multichannel implant in the cochlea is discussed. No implants were used for congenital deformities, but some observations are made of this type of structural deformity of the inner ear. PMID:2390686

  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. Dental Implant Complications.

    Science.gov (United States)

    Liaw, Kevin; Delfini, Ronald H; Abrahams, James J

    2015-10-01

    Dental implants have increased in the last few decades thus increasing the number of complications. Since many of these complications are easily diagnosed on postsurgical images, it is important for radiologists to be familiar with them and to be able to recognize and diagnose them. Radiologists should also have a basic understanding of their treatment. In a pictorial fashion, this article will present the basic complications of dental implants which we have divided into three general categories: biomechanical overload, infection or inflammation, and other causes. Examples of implant fracture, loosening, infection, inflammation from subgingival cement, failure of bone and soft tissue preservation, injury to surround structures, and other complications will be discussed as well as their common imaging appearances and treatment. Lastly, we will review pertinent dental anatomy and important structures that are vital for radiologists to evaluate in postoperative oral cavity imaging.

  4. Evaluation of breast silicone implants.

    Science.gov (United States)

    Brenner, R James

    2013-08-01

    While clinical evaluation of breast implants and their complications can identify capsule contracture and rupture of saline implants, the identification of silicone implant failure is best accomplished by silicone specific protocols for MRI with orthogonal acquisition. Such imaging can also help resolve other clinical problems. Following a brief overview of the history and development of commercial use of silicone implants and alternatives, this article outlines the approach toward optimal imaging and expected results.

  5. The ruptured PIP breast implant

    International Nuclear Information System (INIS)

    Public concern erupted about the safety of Poly Implant Prothèse (PIP) breast implants when it was revealed in 2011 that they contained an inferior, unlicensed industrial-grade silicone associated with a high rate of rupture. There followed national guidance for UK clinicians, which led to a considerable increase in referrals of asymptomatic women for breast implant assessment. In this review we discuss possible approaches to screening the PIP cohort and the salient characteristics of a ruptured implant

  6. Dental implants in growing children

    OpenAIRE

    S.K. Mishra; Chowdhary, N.; Chowdhary, R.

    2013-01-01

    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 o...

  7. Estudio clínico prospectivo de implantes Straumann NNC (Roxolid®) en pacientes con edentulismo parcial.

    OpenAIRE

    Altuna Fistolera, Pablo

    2015-01-01

    Los implantes de diámetro reducido se utilizan en los casos donde el espacio mesio-distal es limitado o la cresta alveolar no permite la colocación de implantes de diámetro estándar. En estos implantes de titanio, el riesgo de fractura aumenta cuando se reduce el diámetro. Para minimizar el riesgo de fractura, se utilizan aleaciones de Ti6Al4V aunque surgen problemas de biocompatibilidad y de corrosión del aluminio y del vanadio. Para mejorar la resistencia mecánica y biocompat...

  8. Cuándo, cómo y por qué del tratamiento antibiótico en las enfermedades periodontales y perimplantarias: how, when and why Antibiotic treatment in periodontal and pre-implant disease

    Directory of Open Access Journals (Sweden)

    JL Gutiérrez Pérez

    2003-08-01

    Full Text Available En este trabajo, se revisan los criterios para el uso del tratamiento antibiótico en las enfermedades periodontales y periimplantarias, y la correlación existente entre los mecanismos etiopatogénicos de ambas. La elección racional para el tratamiento profiláctico y terapéutico se fundamenta en diversos factores y premisas que engloban, desde un punto de vista crítico y práctico, los aspectos más relevantes involucrados en la controversia actual referente al tratamiento antibiótico de las enfermedades periodontales y periimplantarias. Se propone el uso sistemático de un grupo determinado de antibiótico s, y se expone un pro-tocolo específico de actuación terapéutica antimicrobiana.The aim of this article is to review the criteria for the use of antibiotic treatment in the periodontal and perimplant disease, and the correlation existing between etiopathogenic mechanims of both. The rational action for the therapeutic and profiylactic treatment is based on several factors and premises that embody, from a critical and practical point of view, the most relevant aspects involved in the present controversy referent to the antibiotic treatment. The systematic use of a defined group of antibiotics is proposed. Furthermore, an specific protocol of antimicrobial therapeutic management is pointed out.

  9. Implantable Impedance Plethysmography

    Directory of Open Access Journals (Sweden)

    Michael Theodor

    2014-08-01

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

  10. 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.

  11. Corrosion of bio implants

    Indian Academy of Sciences (India)

    U Kamachi Mudali; T M Sridhar; Baldev Raj

    2003-06-01

    Chemical stability, mechanical behaviour and biocompatibility in body fluids and tissues are the basic requirements for successful application of implant materials in bone fractures and replacements. Corrosion is one of the major processes affecting the life and service of orthopaedic devices made of metals and alloys used as implants in the body. Among the metals and alloys known, stainless steels (SS), Co–Cr alloys and titanium and its alloys are the most widely used for the making of biodevices for extended life in human body. Incidences of failure of stainless steel implant devices reveal the occurrence of significant localised corroding viz., pitting and crevice corrosion. Titanium forms a stable TiO2 film which can release titanium particles under wear into the body environment. To reduce corrosion and achieve better biocompatibility, bulk alloying of stainless steels with titanium and nitrogen, surface alloying by ion implantation of stainless steels and titanium and its alloys, and surface modification of stainless steel with bioceramic coatings are considered potential methods for improving the performance of orthopaedic devices. This review discusses these issues in depth and examines emerging directions.

  12. Remote actuated valve implant

    Energy Technology Data Exchange (ETDEWEB)

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

    2016-05-10

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

  13. Ion implantation in polymers

    Science.gov (United States)

    Wintersgill, M. C.

    1984-02-01

    An introductory overview will be given of the effects of ion implantation on polymers, and certain areas will be examined in more detail. Radiation effects in general and ion implantation in particular, in the field of polymers, present a number of contrasts with those in ionic crystals, the most obvious difference being that the chemical effects of both the implanted species and the energy transfer to the host may profoundly change the nature of the target material. Common effects include crosslinking and scission of polymer chains, gas evolution, double bond formation and the formation of additional free radicals. Research has spanned the chemical processes involved, including polymerization reactions achievable only with the use of radiation, to applied research dealing both with the effects of radiation on polymers already in commercial use and the tailoring of new materials to specific applications. Polymers are commonly divided into two groups, in describing their behavior under irradiation. Group I includes materials which form crosslinks between molecules, whereas Group II materials tend to degrade. In basic research, interest has centered on Group I materials and of these polyethylene has been studied most intensively. Applied materials research has investigated a variety of polymers, particularly those used in cable insulation, and those utilized in ion beam lithography of etch masks. Currently there is also great interest in enhancing the conducting properties of polymers, and these uses would tend to involve the doping capabilities of ion implantation, rather than the energy deposition.

  14. Uso del ensayo de implante y la técnica de emisión acústica para estudiar el agrietamiento asistido por hidrógeno en la zona fundida en la soldadura de un acero HSLA-80

    Directory of Open Access Journals (Sweden)

    Fals, H. C.

    1999-08-01

    Full Text Available Weld metal hydrogen assisted cracking was studied using two flux cored wire (AWS E 70T-5 and AWS E 120 T5-K4 and a mixture gas of CO2 + 5% H2 to induce high values of diffusible hydrogen in high strength low alloy steel (HSLA-80 weldments. An Acoustical Emission Measurement System (AEMS RMS voltmeter was coupled to the implant test (NF 89-100 apparatus to determine energy, amplitude and event numbers of signal. All cracks were initiated in the partially melted zone and propagated into the coarse-grained region of the heat affected zone when E 70 T5 consumable was used, and the quasi-cleavage fracture mode was predominant. When E 120 T5 K4 consumable was used the cracks propagated vertically across the fusion zone, and a mixed fracture mode was the most important. A significant relationship between acoustic emission parameters and fracture modes was found.

    Se estudió el agrietamiento asistido por hidrógeno en la zona fundida, usando dos alambres tubulares (E 70T-5 y E 120 T5-K4 y una mezcla gaseosa de CO2 + 5% H2, para inducir altos niveles de hidrógeno difusible en la soldadura de un acero HSLA-80. Un sistema de medición de emisión acústica basado en un voltímetro RMS (Root Mean Square, acoplado a la instalación de ensayo de implante (NF 89-100, permitió determinar la energía, amplitud RMS y número de ciclos de la señal. Se observó por microscopía óptica y electrónica de barrido, que en todos los ensayos las grietas se formaron en la zona parcialmente fundida. Cuando se usó el alambre E 70T-5, las grietas se propagaron a través de la región de crecimiento de grano de la zona térmicamente afectada, predominando el modo de fractura cuasiclivage. En los ensayos del alambre E 120 T5-K4, las grietas crecieron verticalmente a través de la zona fundida, verificándose mayor incidencia de un modo de fractura mixto. Se encontró una relación importante entre los par

  15. Cine virtual y “presencialidad” teatral: El cine electrónico de Coppola y sus imbricaciones en la consolidación del género( Peter Jackson.

    Directory of Open Access Journals (Sweden)

    Antonio Cantos Ceballos

    2011-12-01

    Full Text Available El fenómeno del cine virtual busca colmar una vieja aspiración por aprehender la condición esencial del teatro: la vivencia de un acontecimiento único e irrepetible por parte del espectador que contempla a unos actores enfrentados a situaciones en ese preciso instante. Ya en los años cincuenta se abordan experimentos con el cine en relieve(primer sistema 3D o, también, se emprenden búsquedas con el sentido del olfato(el smell-vision. La llegada de la revolución informática y su motion control system implica una nueva conquista en las sensaciones visuales del espectador y preludia la irrupción de un auténtico visionario en este sentido: Francis Ford Coppola. Su “cine electrónico” es un vehículo experimental para rodar con telecámaras y soporte magnético y, además, prepara el terreno para la aparición de los infogramas y la ruptura definitiva de la secuencia imagen-ojo-objeto, verdadero salto cualitativo hacia la pluridimensionalidad de la imagen. La creación con infogramas de realidades imaginarias y la revitalización del cine de género (Ciencia Ficción y Fantasy Films tiene un momento clave en el año 1999 con dos productos emblemáticos: Matrix y La amenaza fantasma. La definitiva conquista de la emoción “teatral” del espectador “envuelto” por seres inexistentes(monstruos, robots o animales mitológicos, que habitan en lugares alejados en el tiempo o en el espacio es una realidad con Peter Jackson y la primera película de su trilogía tolkeniana: La Comunidad del Anillo.

  16. "En la boca de las nubes" (A la boca dels núvols y con los pies en el suelo. Ramon Vinyes: contra la literatura, la vida

    Directory of Open Access Journals (Sweden)

    Jordi Marrugat i Doménech

    2005-01-01

    Full Text Available Este artículo propone una lectura unitaria del volumen de narraciones de Ramon Vinyes En la boca de las nubes (1946. Además, va a las fuentes de las cuales surge la estética del libro —la narrativa catalana y europea de los años 20-30 y el pensamiento teórico de Vinyes— para explicar como el autor decadentista de La ardiente cabalgata (1909 acaba por escribir un libro tan alejado de los posicionamientos que había mantenido durante el Modernismo. Y es que si en 1909 Vinyes decantaba la balanza de la dicotomía artevida hacia el primero de estos términos, en 1946, después de haber vivido una guerra civil y dos guerras mundiales, la decanta radicamente hacia el segundo. Así, el lector podrá encontrar sugestivas comparaciones entre Vinyes y escritores como T. Gautier, Villiers de l’Isle-Adam, Gabriele d’Annunzio o Gabriel Alomar por lo que se refiere a su época modernista; entre Vinyes y Malraux, Saint-Exupéry, V. Woolf, Joan Oliver o Salvador Espriu, por lo que se refiere a los años 30; y entre Vinyes i Pere Calders o Lluís Ferran de Pol, por lo que se refiere al exilio

  17. Peri-implant hastalıklar

    OpenAIRE

    Dilsiz, Alparslan; Zihni, Meltem; Yavuz, M Selim

    2011-01-01

    The treatment of partially or totally edentulous subjects with oral implants is a common procedure. Biological complications are occur around implants which are peri-implant mucositis and periimplantitis. Peri-implant mucositis is pathological condition which is normally localized in the soft tissues surrounding an oral implant. Peri-implantitis surrounding oral implants is an inflammatory process affecting the soft and hard tissues resulting in rapid loss of supporting bone associated with b...

  18. Nuevos registros de squamata (reptilia para el pleistoceno superior del norte de la provincia de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Federico Agnolin

    2011-01-01

    Full Text Available En el presente artículo son reportados ejemplares de diversos taxones de reptiles escamados fósiles procedentes de la base de la Formación Luján (Pleistoceno Superior, en la localidad fosilífera de Merlo, provincia de Buenos Aires, Argentina. Entre los ejemplares registrados se reconoce el primer registro fósil para el género y especie Anops kingii (Amphisbaenidae; asimismo se reporta la presencia de especies indeterminadas de los géneros Homonota (Gekkonidae y Liolaemus (Liolaemidae. La asociación conjunta de estos tres taxones hoy en día no se encuentra representada en el norte de la provincia de Buenos Aires, siendo la región geográficamente más cercana en donde encuentran una superposición en su distribución el Partido de Balcarce, ubicado en el extremo Sureste de la provincia y alejado unos 600 kilómetros al sur de la localidad fosilífera de Merlo. La presencia conjunta de estos tres reptiles se encuentra de acuerdo con la posible existencia de un pulso árido y frío, tal como ha sido propuesto con anterioridad para porción más inferior del Pleistoceno Superior en la provincia de Buenos Aires.

  19. Opaque intraocular lens implantation

    OpenAIRE

    Yusuf IH; Patel CK

    2013-01-01

    Imran H Yusuf, CK Patel The Oxford Eye Hospital, West Wing, John Radcliffe Hospital, Headley Way, Headington, Oxford, United KingdomWe read with great interest the recent article by Lee et al,1 who described their clinical experience with three patients who underwent primary implantation of Morcher (Stuttgart, Germany) occlusive intraocular lenses (IOLs) across a variety of neuro-ophthalmic indications. We hope to offer some further insight into these clinical observations in the context of o...

  20. Bone Substitutes for Peri-Implant Defects of Postextraction Implants

    Directory of Open Access Journals (Sweden)

    Pâmela Letícia Santos

    2013-01-01

    Full Text Available Placement of implants in fresh sockets is an alternative to try to reduce physiological resorption of alveolar ridge after tooth extraction. This surgery can be used to preserve the bone architecture and also accelerate the restorative procedure. However, the diastasis observed between bone and implant may influence osseointegration. So, autogenous bone graft and/or biomaterials have been used to fill this gap. Considering the importance of bone repair for treatment with implants placed immediately after tooth extraction, this study aimed to present a literature review about biomaterials surrounding immediate dental implants. The search included 56 articles published from 1969 to 2012. The results were based on data analysis and discussion. It was observed that implant fixation immediately after extraction is a reliable alternative to reduce the treatment length of prosthetic restoration. In general, the biomaterial should be used to increase bone/implant contact and enhance osseointegration.

  1. del Nim

    Directory of Open Access Journals (Sweden)

    Arturo Martínez Rodríguez

    2007-01-01

    Full Text Available Dado su uso específico como fuente de insecticidas naturales de fácil biodegradación, entre otras ventajas, el cultivo del árbol Nim ha sido mundialmente extendido en muchas regiones de Asia, África, Australia y América Latina, incluyendo Cuba. La cosecha del fruto del Nim se hace engorrosa debido a la altura que adquieren estos árboles a los pocos años de sembrados, siendo la cosecha mecánica mediante sacudidores de ramas o del tronco, una posible vía de solución práctica de esta problemática. En el presente trabajo se efectúa, mediante la simulación con el empleo de herramientas CAD-3D y programas de análisis por elementos finitos, un análisis modal abarcador de un número importante de modos de vibración del sistema fruto-pedúnculo del Nim. Como resultado del estudio se pudieron recomendar entornos de frecuencias de las vibraciones a aplicar con mejores expectativas durante la cosecha mecanizada de este producto.

  2. Problemas actuales del sistema penitenciario

    OpenAIRE

    González Martín, Jennifer

    2014-01-01

    He pretendido con este proyecto analizar los cambios que actualmente está sufriendo nuestro sistema penitenciario desde una óptica meramente jurídica. A tal fin, este trabajo se centra en analizar, por una parte, el proyecto de reforma del Código Penal centrándose en los aspectos que afectan al sistema penitenciario (en el caso de que finalmente sea aprobado por las Cortes Generales), y, por otra parte, se estudia la conocida como "Doctrina Parot" analizando en qué consiste, cómo se implantó ...

  3. [Prosthetic dilemmas. Connecting natural teeth and implants

    NARCIS (Netherlands)

    Cune, M.S.; Putter, C de; Verhoeven, J.W.; Meijer, G.J.

    2008-01-01

    In clinical practice, the prognosis seems, with some reservations, to be comparable for tooth-implant and implant-implant supported bridges in the middle-long term.This conclusion seems particularly valid for tooth-implant bridges in free-end situations, where a single implant is connected with a to

  4. The change of rotational freedom following different insertion torques in three implant systems with implant driver

    OpenAIRE

    Kwon, Joo-Hyun; Han, Chong-Hyun; Kim, Sun-Jai; Chang, Jae-Seung

    2009-01-01

    STATEMENT OF PROBLEM Implant drivers are getting popular in clinical dentistry. Unlike to implant systems with external hex connection, implant drivers directly engage the implant/abutment interface. The deformation of the implant/abutment interface can be introduced while placing an implant with its implant driver in clinical situations. PURPOSE This study evaluated the change of rotational freedom between an implant and its abutment after application of different insertion torques. MATERIAL...

  5. The Evolution of Breast Implants.

    Science.gov (United States)

    Gabriel, Allen; Maxwell, G Patrick

    2015-10-01

    Breast augmentation remains one of the most common procedures performed in the United States. However, shape, feel, safety, and longevity of the implants remain important areas of research. The data provided by manufacturers show the safety and efficacy of these medical devices. Clinicians should strive to provide ongoing data and sound science to continue to improve clinical outcomes in the future. This article explores the evolution of breast implants with special emphasis on the advancement of silicone implants.

  6. Current trends in dental implants

    OpenAIRE

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

    2014-01-01

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

  7. Dental Implants: Dual Stabilization Technology

    OpenAIRE

    Saini, Rajiv

    2015-01-01

    More recent epidemiological data seem to show an increasing trend of tooth loss due to periodontal reasons rather than caries; the presence of initial attachment loss, bone height and the habit of smoking significantly increase the risk of tooth mortality. A dental implant is a titanium screw which is placed into bone to replace missing teeth. The implant mimics the root of a tooth in function. Dental Implants have changed the face of dentistry over the last three decades. Success of dental i...

  8. Short implants in oral rehabilitation

    OpenAIRE

    Emmanuel Panobianco Chizolini; Ana Cláudia Rossi; Alexandre Rodrigues Freire; Mario Roberto Perussi; Paulo Henrique Ferreira Caria; Felippe Bevilacqua Prado

    2011-01-01

    Introduction and objective: The placement of short dental implants is used as an alternative treatment modality to bone grafting procedures. The aim of this study was to discuss, through a literature review, the features, indications and biomechanical aspects of short implants, as well as to report the clinical factors that influence on their indication. Literature review and conclusion: It was found that short implants osseointegration can be compromised by risk factors that must be controll...

  9. Nanostructured Surfaces of Dental Implants

    OpenAIRE

    Stefano Sivolella; Barbara Zavan; Letizia Ferroni; Chiara Gardin; Vincenzo Vindigni; Edoardo Stellini; Marco Roman; Ilaria Tocco; Riccardo Guazzo; Luca Sbricoli; Eriberto Bressan

    2013-01-01

    The structural and functional fusion of the surface of the dental implant with the surrounding bone (osseointegration) is crucial for the short and long term outcome of the device. In recent years, the enhancement of bone formation at the bone-implant interface has been achieved through the modulation of osteoblasts adhesion and spreading, induced by structural modifications of the implant surface, particularly at the nanoscale level. In this context, traditional chemical and physical process...

  10. Malformación Congénita del fémur. Uso de Ortoprótesis.

    Directory of Open Access Journals (Sweden)

    Yeney Díaz Díaz

    2015-09-01

    Full Text Available En todo tiempo el tratamiento técnico ortopédico de los defectos congénitos y pérdidas de sustancia ósea adquirida de las extremidades han formado parte de la tarea de los cirujanos ortopédicos. Objetivo: presentar un aditamento ortopédico elaborado en el Laboratorio de Ortoprotésis de la provincia de Sancti Spíritus con el fin de corregir un caso con malformación congénita de fémur. Se presenta el caso de un escolar de 8 años de edad segundo hijo nacido de un parto eutócico en el nacimiento se observa la malformación congénita de fémur, se recoge como antecedente familiar importante un familiar alejado del abuelo materno con la misma patología. El paciente es valorado en consulta en el 2012 después de realizar el interrogatorio, examen físico y la elaboración de la historia clínica se hace un análisis del mismo en conjunto con el licenciado en Ortoprótesis y se decide realizar en un inicio una Ortesis larga con asentamiento isquiático y cinturón pélvico y se propone el uso de la Ortoprótesis para mejorar el bienestar del niño, además evitar otras complicaciones. Se concluye que con el uso de la Ortoprótesis se logra un desarrollo psicomotor normal en estos pacientes.

  11. Cochlear implants in genetic deafness

    Institute of Scientific and Technical Information of China (English)

    Xuezhong Liu

    2014-01-01

    Genetic defects are one of the most important etiologies of severe to profound sensorineural hearing loss and play an important role in determining cochlear implantation outcomes. While the pathogenic mutation types of a number of deafness genes have been cloned, the pathogenesis mechanisms and their relationship to the outcomes of cochlear implantation remain a hot research area. The auditory performance is considered to be affected by the etiology of hearing loss and the number of surviving spiral ganglion cells, as well as others. Current research advances in cochlear implantation for hereditary deafness, especially the relationship among clinic-types, genotypes and outcomes of cochlear implantation, will be discussed in this review.

  12. 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.

  13. Short implants: A systematic review

    OpenAIRE

    Karthikeyan, I.; Shrikar R. Desai; Singh, Rika

    2012-01-01

    Background: Short implants are manufactured for use in atrophic regions of the jaws. Although many studies report on short implants as ≤10 mm length with considerable success, the literature regarding survival rate of ≤7 mm is sparse. Purpose: The purpose of this study was to systematically evaluate the publications concerning short dental implants defined as an implant with a length of ≤7 mm placed in the maxilla or in the mandible. Materials and Methods: A Medline and manual search was cond...

  14. Potencial del agua del suelo

    OpenAIRE

    Bustamante Heliodoro

    2012-01-01

    La energía potencial del agua presenta diferencias de un punto del suelo a otro; esas diferencias son las que originan el movimiento del agua de acuerdo a la tendencia universal de la materia en el sentido de moverse de donde la energía potencial es mayor a donde dicha energía es menor. En el suelo el agua en consecuencia se mueve hacia donde su energía decrece hasta lograr su estado de equilibrio. Se desprende entonces que la cantidad de energía potencial absoluta contenida en el agua, no es...

  15. 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...

  16. Management of dislocated intraocular implants.

    Science.gov (United States)

    Chan, C K; Agarwal, A; Agarwal, S; Agarwal, A

    2001-12-01

    Implant dislocation may occur in the absence of appropriate capsular or zonular support (PCIOL) (11,35,53) or following traumatic injury to anterior ocular tissues (ACIOL). (11,19,20) Other factors (e.g., advanced patient age, high myopia, previous vitrectomy, pseudoexfoliation syndrome, and certain connective tissue disorders) also may predispose implant dislocation. (9,52) Although reported for all types of IOLs, implant dislocation is becoming more manageable because of the advancement of surgical techniques. A dislocated ACIOL or PCIOL may be explanted, exchanged, or repositioned. (11,48,71) Repositioning the dislocated PCIOL in the ciliary sulcus with modern vitreoretinal techniques provides an optimal environment for visual recovery. (11,71) Implant repositioning techniques generally may be categorized into the external or the internal approaches. (8,11) The former involves external suturing methods for a primary or secondary implant in the absence of adequate capsular or zonular support (15,16,31,42,56,60,61,64,66,73,76) and the latter is achieved through modern pars plana techniques. 8,11,62,69) Recently, several implant repositioning methods gaining increasing acceptance include the scleral loop fixation, (45) the snare approach, (43) the use of the 25-gauge implant forceps, (13) temporary haptic externalization, (8,11,36,71) and the use of perfluorocarbon liquids. (1,28,40,41,44) The temporary haptic externalization method combines the best features of the external and the internal approaches, avoids complex intraocular maneuvers, and allows precise scleral fixation of the dislocated IOL on a consistent basis. (8,11,71) Endoscopy provides the surgeon with optimal viewing of the anterior retropupillary anatomy that is often difficult to appreciate (e.g., capsular-zonular complex, ciliary sulcus, anterior retina, and vitreous base). (6,11) As a result, precise haptic placement is possible during the repositioning process. (6,11) However, a three

  17. Implant periapical lesion: Diagnosis and treatment

    OpenAIRE

    Peñarrocha Diago, María; Maestre Ferrín, Laura; Cervera Ballester, Juan; Peñarrocha Oltra, David

    2012-01-01

    The implant periapical lesion is the infectious-inflammatory process of the tissues surrounding the implant apex. It may be caused by different factors: contamination of the implant surface, overheating of bone during drilling, preparation of a longer implant bed than the implant itself, and pre-existing bone disease. Diagnosis is achieved by studying the presence of symptoms and signs such us pain, swelling, suppuration or fistula; in the radiograph an implant periapical radiolucency may app...

  18. Piezosurgery in implant dentistry

    Directory of Open Access Journals (Sweden)

    Stübinger S

    2015-11-01

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

  19. “COOPEDALEANDO”: UNA ACTIVIDAD FÍSICA EN BICICLETA PARA NIÑOS Y NIÑAS CON TRASTORNOS DEL ESPECTRO AUTISTA

    Directory of Open Access Journals (Sweden)

    Irene María Villalba Urbaneja,

    2015-05-01

    Full Text Available Las personas con necesidades educativas especiales, particularmente con Trastornos del Espectro Autista (TEA, se han sentido alejados de las actividades físicas y lúdicas, a pesar de que la legislación vigente exige tenerlos en cuenta (Ley Orgánica 2/2006.El autismo es “una de las alteraciones más graves del desarrollo durante la primera infancia que constituye uno de los problemas más serios desde el punto de vista personal, familiar y social” (Crespo, 2001. Según señala el DSM-IV-TR (2000, los TEA son una serie de Trastornos Neuropsiquiátricos catalogados como Trastornos Generalizados del Desarrollo. Por todo ello, “todos los sujetos que presentan rasgos autistas tienen una enorme necesidad de practicar y desarrollar sus capacidades motoras de manera regular y el deterioro de las mismas es consecuencia de su discapacidad en establecer mecanismos propios para desarrollarlas por medio de juegos, educación psicomotriz o actividad física” (Molina, 2006.“Coopedalenado” fue una propuesta físico-educativa llevada a cabo con los niños y niñas de la Asociación Autismo Palencia durante el año 2014 en las instalaciones deportivas del Complejo Universitario de La Yutera, Palencia.Objetivos: Desarrollar las Habilidades Motrices Básicas y las Habilidades Perceptivas de los participantes, Mejorar las Habilidades Sociales a partir de actividades físicas específicamente diseñadas; Adquirir una mayor autonomía en el área psíquico y sensorial a partir de su estimulación.

  20. Endometrium implantation and ectopic pregnancy

    Institute of Scientific and Technical Information of China (English)

    LIU; Yixun

    2004-01-01

    Embryo in uterine implantation is a complex and multifactor-related process and is a downstream and ideal point for woman fertility control.Understanding the cellular and molecular mechanism of implantation is a prerequisite for development of anti-implantation contraceptives.In spite of considerable accumulation of information from the laboratory animals that has been achieved,it is difficult to generate such information in human due to ethical restriction and experimental limitation,and the present knowledge for understanding the definitive mechanisms which control these events remains elusive.Embryo implantation can also occur outside uterus.Some women with abdominal pregnancies could successfully complete the processes of gestation and bear normal babies,implying that implantation itself may be not an endometrium-specific process.Reproductive biologists should cooperate with gynecologists to further comparatively study the molecular and cellular mechanisms of implantation normally occurring in endometrium and abnormally appearing outside uterine cavity.Such collaborative studies may generate new important information for developing anti-implantation contraceptive and for techniques of accurate diagnosis of ectopic pregnancy.A specially designed GnRH-2 analog and a combination use of Iow dose RU486 and gossypol as anti-implantation contraceptives have been suggested.

  1. NEGATIVE IMPLANT - A RETROSPECTIVE STUDY

    NARCIS (Netherlands)

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

    1993-01-01

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

  2. Implantable Antennas for Biomedical Applications

    OpenAIRE

    Merli, Francesco

    2011-01-01

    Since the introduction of implantable pacemakers in the early 1960s, implantable medical devices have become more and more interesting for healthcare services. Nowadays, the devices designed to monitor physiological data from inside the human body have great promises to provide major contributions to disease prevention, diagnosis and therapy. Furthermore, minimally invasive devices allow reducing hospitalization terms, thus improving the patients' qua...

  3. Bifosfonatos e implantes dentales, ¿son incompatibles? Revisión de la literatura

    Directory of Open Access Journals (Sweden)

    Manuel Moreno-Sánchez

    2016-07-01

    Conclusiones: El tratamiento con bifosfonatos no disminuye la osteointegración del implante dental, aunque estos resultados se han obtenido en base a estudios retrospectivos en humanos. Se han descrito casos de osteonecrosis de los maxilares relacionada con bifosfonatos en estos pacientes, sobre todo tras tratamiento prolongado.

  4. Short implants in oral rehabilitation

    Directory of Open Access Journals (Sweden)

    Emmanuel Panobianco Chizolini

    2011-07-01

    Full Text Available Introduction and objective: The placement of short dental implants is used as an alternative treatment modality to bone grafting procedures. The aim of this study was to discuss, through a literature review, the features, indications and biomechanical aspects of short implants, as well as to report the clinical factors that influence on their indication. Literature review and conclusion: It was found that short implants osseointegration can be compromised by risk factors that must be controlled to achieve treatment success. In conclusion, the main indication of short implants is to avoid an invasive surgery at atrophic areas of maxilla and mandible. Furthermore, implant design associated with surface treatment are factors that compensate its short length.

  5. [Dental implants in tooth grinders].

    Science.gov (United States)

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

    2004-03-01

    Bruxism (tooth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly due to the large variation in the technical and the biological aspects of the investigations. Although there is still no proof that bruxism causes overload of dental implants and their suprastructures, a careful approach is recommended. Practical advices as to minimize the chance of implant failure are given. Besides the recommendation to reduce or eliminate bruxism itself, these advices concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the use of a hard nightguard. PMID:15058243

  6. Tratamiento de pacientes parcialmente edéntulos con prótesis dentoimplantosoportadas Treatment of partial edentulous patiens wise prothesis dento implants supported

    OpenAIRE

    L. Cañada Madinazcoitia; J Del Río Highsmith; J. Martínez Vázquez de Parga

    2001-01-01

    Un problema con el que nos encontramos cuando hacemos la planificación del paciente parcialmente desdentado, es si al colocar los implantes sería correcto unirlos a los dientes adyacentes o no. Este dilema se debe a la diferente movilidad que tienen el diente natural con su ligamento periodontal y el implante osteointegrado. Brunski publicó estas diferencias en intrusión del diente y el implante. Sin embargo, hay numerosos beneficios de unir ambos pilares, entre los que podemos citar: necesit...

  7. Apicectomía o implante: Reporte de un caso clínico.

    Directory of Open Access Journals (Sweden)

    Enrique Fernández-Bodereau

    2012-07-01

    Full Text Available RESUMEN Se reporta un caso clínico de un paciente al que se le realizó apicectomía en un premolar superior, presumiblemente por una endodoncia realizada en forma inadecuada y tener un perno colado donde la extracción del mismo correría el riesgo de la fractura dentaria. Fracasado dicho tratamiento se realiza un implante inmediato a la exodoncia, donde se colocó relleno óseo autólogo y xenoinjerto con membrana de colágeno reabsorbible. De esto se deduce que la faz diagnóstica es muy importante. Después de 4 meses se realiza la carga funcional del implante con una corona cerámica cementada. Uno de los factores que influyeron en los resultados positivos de este caso, es la superficie ultramicrotexturada del implante que se usó, además de ser considerados estadísticamente los premolares de tener la tabla ósea vestibular de mayor espesor que el sector anterior. Abstract: We report a clinical case of a patient who underwent apicectomy on an upper premolar, presumably by endodontic done improperly, and have cast a bolt where the extraction run the risk of tooth fracture. Failed such treatment, an implant is performed, placed immediately after extraction, in which bone filling with xenograft and guided bone regeneration with resorbable collagen membrane was done. From this we deduce that the phase diagnosed is of paramount importance. Two months after functional load of the implant is made with a cemented ceramic crown. One of the factors that influenced the positive outcome of this case, where immediately implants are placed to the tooth extraction is ultra microtextured surface of the used implant, besides being the bone table of these dental elements of thicker vestibular.

  8. Implantable, multifunctional, bioresorbable optics.

    Science.gov (United States)

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

    2012-11-27

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

  9. Culturas del Mundo

    DEFF Research Database (Denmark)

    Benwell, Ann Fenger; Costa, Alberto; Waehle, Espen

    2006-01-01

    ’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39......’Culturas del mundo. Colecciones del Museo Nacional de Dinamarca’ with Ann Fenger Benwell in Culturas del Mundo. Colecciones del Museo Nacional de Dinamarca, ed. Silvia Sauquet, Fundación "la Caixa", Barcelona 2006, pp. 31-39...

  10. Los estilos afectivos en la población española: un cuestionario de evaluación del apego adulto

    Directory of Open Access Journals (Sweden)

    Remedios Melero

    2008-01-01

    Full Text Available Este artículo detalla el proceso de elaboración y baremación del "Cuestionario de Apego Adulto". Un total de 445 sujetos, 159 hombres y 286 mujeres con una media de 30,5 años cumplimentaron el cuestionario original. Los análisis factoriales mostraron la solución de 4 factores como la más idónea, con un total de 40 ítems. Estos factores fueron: Baja autoestima, necesidad de aprobación y miedo al rechazo, Resolución hostil de conflictos, rencor y posesividad, Expresión de sentimientos y comodidad con las relaciones y Autosuficiencia emocional e incomodidad con la intimidad. Para establecer tipologías se realizaron análisis de conglomerados. La solución de dos clusters clasificó a los sujetos en seguros e inseguros, y la solución de cuatro en seguros, preocupados, alejados y temerosos hostiles. Nuestros resultados identifican un estilo temeroso algo diferente al de Bartholomew y Horowitz (1991. Se discuten las particularidades de los estilos afectivos y sus propiedades psicométricas.

  11. 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.

  12. La rehabilitación fija sobre implantes en pacientes edéntulos totales: un estudio a dos años

    Directory of Open Access Journals (Sweden)

    P. Galarza Estebaranz

    2015-12-01

    Full Text Available Introducción: El objetivo del presente estudio era mostrar los resultados clínicos del tratamiento con una rehabilitación fija mediante implantes dentales en pacientes edéntulos totales. Métodos: Veinte pacientes fueron tratados con 248 implantes Galimplant® de conexión externa y con superficie arenada y grabada para la rehabilitación fija. Los implantes fueron cargados después de un periodo de cicatrización de 2 meses. El seguimiento clínico fue al menos de 24 meses. Resultados: 145 implantes fueron insertados en el maxilar superior y 103 implantes en la mandíbula. Se realizaron 27 rehabilitaciones fijas, 15 maxilares y 12 mandibulares. El 100% de las prótesis realizadas fueron cementadas. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 98,4%. Cuatro implantes se perdieron durante el periodo de cicatrización. Después de un periodo medio de carga funcional de 27,3 meses, no ha habido complicaciones tardías. Conclusiones: Este estudio indica que el tratamiento con una rehabilitación fija mediante implantes dentales en pacientes edéntulos constituye una terapéutica con éxito.

  13. 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

  14. Microsystems Technology for Retinal Implants

    Science.gov (United States)

    Weiland, James

    2005-03-01

    The retinal prosthesis is targeted to treat age-related macular degeneration, retinitis pigmentosa, and other outer retinal degenerations. Simulations of artificial vision have predicted that 600-1000 individual pixels will be needed if a retinal prosthesis is to restore function such as reading large print and face recognition. An implantable device with this many electrode contacts will require microsystems technology as part of its design. An implantable retinal prosthesis will consist of several subsystems including an electrode array and hermetic packaging. Microsystems and microtechnology approaches are being investigated as possible solutions for these design problems. Flexible polydimethylsiloxane (PDMS) substrate electrode arrays and silicon micromachined electrode arrays are under development. Inactive PDMS electrodes have been implanted in 3 dogs to assess mechanical biocompatibility. 3 dogs were followed for 6 months. The implanted was securely fastened to the retina with a single retinal tack. No post-operative complications were evident. The array remained within 100 microns of the retinal surface. Histological evaluation showed a well preserved retina underneath the electrode array. A silicon device with electrodes suspended on micromachined springs has been implanted in 4 dogs (2 acute implants, 2 chronic implants). The device, though large, could be inserted into the eye and positioned on the retina. Histological analysis of the retina from the spring electrode implants showed that spring mounted posts penetrated the retina, thus the device will be redesigned to reduce the strength of the springs. These initial implants will provide information for the designers to make the next generation silicon device. We conclude that microsystems technology has the potential to make possible a retinal prosthesis with 1000 individual contacts in close proximity to the retina.

  15. 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)

  16. Silicone breast implants and platinum.

    Science.gov (United States)

    Wixtrom, Roger N

    2007-12-01

    Platinum, in a specific form, is used as a catalyst in the cross-linking reactions of the silicone gel and elastomer in breast implants. After manufacture, it remains in the devices at low-parts-per-million levels. Potential concerns have been raised as to whether this platinum might diffuse from silicone breast implants into the body and result in adverse health effects. The weight of evidence indicates that the platinum present is in its most biocompatible (zero valence) form, and the very minute levels (<0.1 percent) that might diffuse from the implants do not represent a significant health risk to patients. PMID:18090821

  17. Pediatric cochlear implantation: an update.

    Science.gov (United States)

    Vincenti, Vincenzo; Bacciu, Andrea; Guida, Maurizio; Marra, Francesca; Bertoldi, Barbara; Bacciu, Salvatore; Pasanisi, Enrico

    2014-01-01

    Deafness in pediatric age can adversely impact language acquisition as well as educational and social-emotional development. Once diagnosed, hearing loss should be rehabilitated early; the goal is to provide the child with maximum access to the acoustic features of speech within a listening range that is safe and comfortable. In presence of severe to profound deafness, benefit from auditory amplification cannot be enough to allow a proper language development. Cochlear implants are partially implantable electronic devices designed to provide profoundly deafened patients with hearing sensitivity within the speech range. Since their introduction more than 30 years ago, cochlear implants have improved their performance to the extent that are now considered to be standard of care in the treatment of children with severe to profound deafness. Over the years patient candidacy has been expanded and the criteria for implantation continue to evolve within the paediatric population. The minimum age for implantation has progressively reduced; it has been recognized that implantation at a very early age (12-18 months) provides children with the best outcomes, taking advantage of sensitive periods of auditory development. Bilateral implantation offers a better sound localization, as well as a superior ability to understand speech in noisy environments than unilateral cochlear implant. Deafened children with special clinical situations, including inner ear malformation, cochlear nerve deficiency, cochlear ossification, and additional disabilities can be successfully treated, even thogh they require an individualized candidacy evaluation and a complex post-implantation rehabilitation. Benefits from cochlear implantation include not only better abilities to hear and to develop speech and language skills, but also improved academic attainment, improved quality of life, and better employment status. Cochlear implants permit deaf people to hear, but they have a long way to go before

  18. Prácticas pedagógicas y competencias ciudadanas: El caso del docente de historia en Chile

    Directory of Open Access Journals (Sweden)

    Muñoz Labraña, Carlos

    2015-09-01

    Full Text Available En el presente artículo exponemos los resultados obtenidos sobre las prácticas pedagógicas y las competencias ciudadanas en una investigación financiada por el Centro de Investigación Avanzada en Educación (CIAE. En él analizamos algunas de las estructuras comunicativas presentes en la intervención didáctica del docente de Historia, Geografía y Ciencias Sociales de quinto a octavo año de Educación Básica en la ciudad de Concepción (Chile, desde donde se atiende la forma como estas interfieren en el desarrollo de determinadas competencias ciudadanas. Para ello, se utilizó una metodología cualitativa por medio de observaciones y registros de aula en 12 escuelas, tomando en consideración su dependencia administrativa. Los resultados demuestran cómo algunas de las dinámicas de comunicación y participación más comunes en las aulas dificultan y hasta contradicen el desarrollo de las competencias ciudadanas, que exigen el desarrollo autónomo y la participación activa de los estudiantes. Consecuentemente, el mundo de vivencias que conforman la realidad del aula resulta estar muy alejado de las experiencias propias de la vida social y democrática, donde idealmente los jóvenes debieran ser protagonistas para el desarrollo de una ciudadanía activa.

  19. Temporización inmediata de implantes unitarios en la maxila posterior Immediate temporization of posterior maxilla single tooth implant

    Directory of Open Access Journals (Sweden)

    Y Leighton

    2011-04-01

    Full Text Available Propósito: El presente artículo es un estudio prospectivo de las tasas de éxito implantaria y de las complicaciones mecánicas y biológicas en el tratamiento rehabilitador implanto-asistido del sector posterior de la maxila, mediante provisionalización inmediata. Material y Método: El estudio clínico observó a 21 sujetos desdentados parciales unitarios del sector posterior maxilar, con reborde cicatrizado y antagonista dentario natural, por un período de 6 meses, en los que se insertaron implantes cónicos roscados de conexión interna, con tratamiento de superficie, temporizados inmediatamente después de insertados en el hueso maxilar, mediante la confección de una corona de resina acrílica sobre un pilar temporal de titanio atornillada directa al implante, dejados sin contactos dentarios durante la máxima intercuspidación (MIC y movimientos excéntricos mandibulares. Todas las restauraciones fueron observadas durante un período de 6 meses, evaluando tasa de éxito implantario, complicaciones biológicas y mecánicas. Resultados: Se insertaron 25 implantes en 21 pacientes, obteniéndose un valor promedio de inserción de torque quirúrgico de 45.6 Nt. Durante el período de observación clínico se presentó un 100% de éxito de sobrevida implantario, no se detectaron complicaciones biológicas, pero sí se presentaron complicaciones mecánicas por fractura de una cúspide vestibular de una restauración provisional acrílica y dos aflojamientos de tornillos. Conclusiones: La temporización unitaria mediante provisorio atornillado es un protocolo predecible y confiable que permite el proceso de oseointegración y la coexistencia en salud de tejido periimplantario y su sistema protésico.Purpose: This article is a prospective study of implant success rates and of mechanical and biological complications in the assisted-implant rehabilitation treatment of the posterior maxilla by immediate temporization. Material and Methods: The

  20. Acerca del tópico de párrafo

    Directory of Open Access Journals (Sweden)

    Jacinto González Cobas

    2008-12-01

    Full Text Available El estudio pragmático e informativo de la oración ha ganado en adeptos en los últimos años, si bien aún es necesario profundizar en algunos de los conceptos manejados por los investigadores que se han interesado por este asunto. Fundamentalmente se han lanzado propuestas que han tenido en cuenta el modo en que la información se despliega a través del material lingüístico, así como la naturaleza y características de los elementos que conforman dicho material. Como consecuencia de los avances habidos a propósito de estas cuestiones, han cobrado importancia nociones como el tópico, comentario, tema o rema, surgidos en principio para dar nombre y respuesta a algunos de los fenómenos que tienen lugar cuando el hablante trata de transmitir información a potenciales recep- tores, y que han sido circunscritos casi exclusivamente al ámbito oracional. En las páginas que siguen pretendo demostrar que esta es una visión en cierto modo sesgada, por haber unidades de mayor envergadura que normalmente no son tenidas en cuenta y que creo sí deberían ser tomadas en consideración. Me refiero al párrafo, de cuyo estudio se pueden extraer conclusiones esclarecedoras aplicadas, concretamente, a la noción de tópico. Por eso propongo, en este trabajo, relacionar ambos conceptos aun cuando da la impresión de que se hallan, en principio, muy alejados.

  1. Historicidad e irreversibilidad en la concepción prigoginiana y agustiniana del tiempo

    Directory of Open Access Journals (Sweden)

    Eduardo Ibáñez

    2003-01-01

    Full Text Available El trabajo compara las nociones de "historicidad" e "irreversibilidad" en la concepción del tiempo de Prigogine y de San Agustín, estableciendo semejanzas y diferencias. Analiza primero la idea agustiniana de la temporalidad siguiendo el Libro Undécimo de las Confesiones, y las interpretaciones de dicha idea efectuadas por Paul Ricoeur y por Jean Guitton. A continuación, analiza la redefinición del tiempo llevada a cabo por Ilya Prigogine, diferenciándola fundamentalmente de la concepción estática o geométrica de la dinámica newtoniana. Muestra que esta reconceptualización lo diferencia de la física clásica y lo acerca a la idea agustiniana del tiempo, en tanto y en cuanto, en ambos autores, las nociones de "irreversibilidad", "historicidad", "novedad", "acontecimiento" y "creatividad", son cruciales para entender la temporalidad. Finalmente, pone de manifiesto las diferencias entre los dos autores: mientras que San Agustín se refiere fundamentalmente a un tiempo humano o existencial, en el que está presente un claro sentido de la trascendencia, Prigogine alude al tiempo de la dinámica y la termodinámica de los procesos irreversibles alejados del equilibrio, en un sentido ciertamente inmanente y físico.The essay compares the notions of "historicity" and "irreversibility" in the Prigoginean and Agustinian conceptions, establishing likenesses and differences. It analyzes the Agustinian idea of the temporality following the Book Eleventh of the Confessions, and the interpretations of Paul Ricoeur and Jean Guitton. It analyzes, next, the redefinition of the "time" formulated by Ilya Prigogine, differentiating it, fundamentally, from the static or geometric conception of the Newton's dynamic. It shows that this re-conceptualization differentiates it from the classic Physics and brings it nearer to the Agustinian idea of the time, as that, in both authors, the "irreversibility", "historicity", "novelty", "event" and "creativity

  2. 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.

  3. 21 CFR 522.1350 - Melatonin implant.

    Science.gov (United States)

    2010-04-01

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

  4. Accidental Implant Screwdriver Ingestion: A Rare Complication during Implant Placement.

    OpenAIRE

    Anshul Jain; Baliga, Shridhar D

    2014-01-01

    One of the complications during a routine dental implant placement is accidental ingestion of the implant instruments, which can happen when proper precautions are not taken. Appropriate radiographs should be taken to locate the correct position of foreign body; usually the foreign body passes asymptomatically from gastrointestinal tract but sometimes it may lead to intestinal obstruction, perforations and impactions. The aim of this article is to report accidental ingestion of 19 mm long scr...

  5. Assistência humanizada ao neonato prematuro e/ou de baixo peso: implantação do Método Mãe Canguru em Hospital Universitário Asistencia humanizada al recién nacido prematuro y/o de bajo peso: implantación del Método Madre Canguro en el Hospital Universitario Humanized assistence to premature and/or low weigh newborn: implantation of Kangaroo-Mother Method at a University Hospital

    Directory of Open Access Journals (Sweden)

    Fabrícia Adriana Mazzo Neves

    2006-09-01

    Full Text Available Relato de experiência de enfermeiros e equipe multiprofissional no processo de implantação do Método Mãe Canguru no Hospital Universitário, da Universidade Estadual de Maringá, Paraná, em 2002, com os objetivos de: humanizar o cuidado ao recém-nascido prematuro e/ou de baixo peso, aprimorando o suporte familiar; promoção de maior nível de satisfação da equipe assistencial. O bebê fica em contato pele a pele com o peito da mãe, pai ou familiar significativo, com benefícios para seu peso, temperatura, afetividade, aleitamento materno, além da provável redução no tempo de internação e risco de infecção. Capacitada pelo Ministério da Saúde, uma equipe passou à implantação e multiplicação do Método; elaborado um Projeto de Extensão institucional, multiprofissional, como organizador e integrador do ensino à assistência. Dificuldades encontradas foram em relação à associação entre tecnologia, relacionamento interpessoal e entre as diversas áreas, cuidado humano e participação familiar.Se trata del relato de experiencia de enfermeros y grupo multiprofesional en el proceso de implantación del Método Madre Canguro en el Hospital Universitario, de la Universidad Estatal de Maringá, Paraná, en el 2002, con los objetivos de: humanizar el cuidado al recién nacido prematuro o bajo peso, mejorando el soporte familiar, promoción de mayor nivel de satisfacción del grupo asistencial. El bebé permanece en contacto piel a piel con el pecho de la madre, padre o familiar significativo, con beneficios para el peso, temperatura, afecto, amamantamiento, además de la probable reducción en el tiempo de internamiento y riesgos de infección. Capacitado por el Ministerio de Salud, un grupo pasó a la implantación y multiplicación del Método; elaborado un Proyecto de Extensión institucional multiprofesional como organizador e integrador de la enseñanza y asistencia. Fueron encontradas dificultades en relación a la

  6. Análisis de esfuerzos mediante el método de elementos finitos de implantes dentales de titanio poroso

    Directory of Open Access Journals (Sweden)

    Luis Pérez Pozo

    2015-01-01

    Full Text Available El titanio y sus aleaciones son los materiales mayormente empleados como sustitutos del tejido óseo en implantes dentales. Sin embargo, éstos presentan una desventaja debido a la marcada diferencia de rigidez del titanio con el tejido óseo, pues producen el fenómeno conocido como apantallamiento de tensiones, una de las principales causas de reabsor - ción ósea alrededor del implante. Una de las posibles soluciones es la fabricación de implantes de titanio poroso con un balance adecuado de propiedades mecánicas, es decir, rigidez y resistencia mecánica. En este trabajo se presenta un análisis de esfuerzos de un implante dental de titanio poroso empleando el método de elementos finitos. Se generó un modelo para un implante dental de titanio sólido que consiste en unión cementada entre corona e implante sin aditamento y de un solo cuerpo. Al comprobar con la literatura su validez, se emplearon las mismas con - diciones de contorno para el implante de titanio poroso con 40%, 50%, 60% y 70% de porosidad. Se investigó la distribución de esfuerzos sobre el conjunto corona-implante y la interfaz implante-hueso en condición de carga estática, así como los valores del módulo de Young para los implantes porosos. Se concluye que la mejor respuesta de cara a esta aplicación se obtiene con el titanio poroso al 40%.

  7. 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...... untreated ruptures are associated with changes over time in magnetic resonance imaging findings, serologic markers, or self-reported breast symptoms. A baseline magnetic resonance imaging examination was performed in 1999 on 271 women who were randomly chosen from a larger cohort of women having cosmetic...... breast implants for a median period of 12 years (range, 3 to 25 years). A follow-up magnetic resonance imaging examination was carried out in 2001, excluding women who underwent explantation in the period between the two magnetic resonance imaging examinations (n = 44). On the basis of these examinations...

  8. Peri-implant esthetics assessment and management

    OpenAIRE

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

    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 disc...

  9. Computerized implant-dentistry: Advances toward automation

    OpenAIRE

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

    2015-01-01

    Advancements in the field of implantology such as three-dimensional imaging, implant-planning software, computer-aided-design/computer-aided-manufacturing (CAD/CAM) technology, computer-guided, and navigated implant surgery have led to the computerization of implant-dentistry. This three-dimensional computer-generated implant-planning and surgery has not only enabled accurate preoperative evaluation of the anatomic limitations but has also facilitated preoperative planning of implant position...

  10. Cochlear Implants and Brain Plasticity

    OpenAIRE

    Fallon, James B.; Irvine, Dexter R. F.; Shepherd, Robert K.

    2002-01-01

    Cochlear implants have been implanted in over 110,000 deaf adults and children worldwide and provide these patients with important auditory cues necessary for auditory awareness and speech perception via electrical stimulation of the auditory nerve (AN). In 1942 Woolsey & Walzl presented the first report of cortical responses to localised electrical stimulation of different sectors of the AN in normal hearing cats, and established the cochleotopic organization of the projections to primary au...

  11. Carbon coatings for medical implants

    OpenAIRE

    K. Bakowicz-Mitura; P. Couvrat; I. Kotela; P. Louda; D. Batory; J. Grabarczyk

    2007-01-01

    Purpose: In this paper we report in vitro and in vivo results of Nanocrystalline Diamond Coatings whichare used in medicine onto medical implants The very important property of carbon coatings is the protectionliving organism against the metalosis. Different medical implants with complicated shapes are covering byNanocrystalline Diamond Coatings by RF dense plasma CVD.Design/methodology/approach: 1) Material characterizations of deposited coatings have been evaluated by using:Transmission Ele...

  12. Implant rehabilitation in bruxism patient

    OpenAIRE

    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 protocol...

  13. Los riesgos, su identificación, asignación y amortización en los contratos del Estado

    Directory of Open Access Journals (Sweden)

    Patricia Mier Barros

    2010-12-01

    Full Text Available Este artículo presenta el entorno normativo de la contratación pública en Colombia, el modo que es entendido y aplicado, y las conductas e interpretaciones de las partes contractuales, lo cual ha dado lugar a la problemática que hoy aqueja al sistema contractual público en Colombia, alejado cada vez más de los propósitos perseguidos por la Constituyente de 1991 y de las leyes que han procurado eliminar los obstáculos que impedían la gestión del Estado Empresario y la llegada del capital privado a los fines estatales en el desarrollo de la infraestructura de servicios. Se hace especial énfasis en la adecuada estructuración del proyecto, la debida distribución de los riesgos y la atención a la realidad técnica, financiera, social y económica en la cual se desarrollan los proyectos. / This article describes the legal environment for public hiring in Colombia. Specifically, it investigates the way public contracts are understood and applied, as well as the behavior and interpretations of the contractual parties. The public hiring system in Colombia grows more and more controversial as it distances itself from its 1991 constitutional mandate, removing obstacles that impede the management of a business State. The article also examines the effect of private capital in support of State development projects and service infrastructure. Special emphasis is given to adequate project structuring, due risk distribution, and attention to technical, financial, social, and economic realities involved in project development.

  14. Galactorrea grave tras aumento mamario con implantes Severe galactorrhea after mammary augmentation with implants

    Directory of Open Access Journals (Sweden)

    F.T. Fidalgo Rodríguez

    2012-06-01

    Full Text Available La galactorrea es una complicación poco frecuente después de la cirugía plástica mamaria. Su causa aun es desconocida, aunque lo más probable es que su aparición tenga un origen multifactorial. En el caso que presentamos la paciente desarrolló incremento simétrico del volumen de ambas mamas después de un cirugía de aumento mamario. No se detectaron cambios en los valores de prolactina. El proceso no respondió al tratamiento con bromocriptina. La galactorrea postquirúrgica con frecuencia sigue un curso benigno y autolimitado, culminando con resolución espontánea. Dependiendo de la severidad de los síntomas, su tratamiento puede ser médico y/o quirúrgico, con drenaje o incluso retirada de los implantes mamarios.Galactorrhea is a complication rarely observed after mammary plastic surgery. The cause remains unknown although it's likely to be multifactorial. In the reported case, the patient described symmetric massive engorgement of both breasts after augmentation mammoplasty. No significant change was detected in the postoperative prolactin values. The condition was unresponsive to treatment with bromocriptine. Postsurgical galactorrhea often follows a benign course culminating in spontaneous resolution Depending on symptom severity, treatment may be medical with the prescription of dopaminergic agonists, and/or surgical with drainage or even removal of the mammary implants.

  15. 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.

  16. Ion implanted dielectric elastomer circuits

    Science.gov (United States)

    O'Brien, Benjamin M.; Rosset, Samuel; Anderson, Iain A.; Shea, Herbert R.

    2013-06-01

    Starfish and octopuses control their infinite degree-of-freedom arms with panache—capabilities typical of nature where the distribution of reflex-like intelligence throughout soft muscular networks greatly outperforms anything hard, heavy, and man-made. Dielectric elastomer actuators show great promise for soft artificial muscle networks. One way to make them smart is with piezo-resistive Dielectric Elastomer Switches (DES) that can be combined with artificial muscles to create arbitrary digital logic circuits. Unfortunately there are currently no reliable materials or fabrication process. Thus devices typically fail within a few thousand cycles. As a first step in the search for better materials we present a preliminary exploration of piezo-resistors made with filtered cathodic vacuum arc metal ion implantation. DES were formed on polydimethylsiloxane silicone membranes out of ion implanted gold nano-clusters. We propose that there are four distinct regimes (high dose, above percolation, on percolation, low dose) in which gold ion implanted piezo-resistors can operate and present experimental results on implanted piezo-resistors switching high voltages as well as a simple artificial muscle inverter. While gold ion implanted DES are limited by high hysteresis and low sensitivity, they already show promise for a range of applications including hysteretic oscillators and soft generators. With improvements to implanter process control the promise of artificial muscle circuitry for soft smart actuator networks could become a reality.

  17. Nanostructured Surfaces of Dental Implants

    Directory of Open Access Journals (Sweden)

    Stefano Sivolella

    2013-01-01

    Full Text Available The structural and functional fusion of the surface of the dental implant with the surrounding bone (osseointegration is crucial for the short and long term outcome of the device. In recent years, the enhancement of bone formation at the bone-implant interface has been achieved through the modulation of osteoblasts adhesion and spreading, induced by structural modifications of the implant surface, particularly at the nanoscale level. In this context, traditional chemical and physical processes find new applications to achieve the best dental implant technology. This review provides an overview of the most common manufacture techniques and the related cells-surface interactions and modulation. A Medline and a hand search were conducted to identify studies concerning nanostructuration of implant surface and their related biological interaction. In this paper, we stressed the importance of the modifications on dental implant surfaces at the nanometric level. Nowadays, there is still little evidence of the long-term benefits of nanofeatures, as the promising results achieved in vitro and in animals have still to be confirmed in humans. However, the increasing interest in nanotechnology is undoubted and more research is going to be published in the coming years.

  18. 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.

  19. 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.

  20. Cochlear implantation: a biomechanical prosthesis for hearing loss.

    Science.gov (United States)

    Yawn, Robert; Hunter, Jacob B; Sweeney, Alex D; Bennett, Marc L

    2015-01-01

    Cochlear implants are a medical prosthesis used to treat sensorineural deafness, and one of the greatest advances in modern medicine. The following article is an overview of cochlear implant technology. The history of cochlear implantation and the development of modern implant technology will be discussed, as well as current surgical techniques. Research regarding expansion of candidacy, hearing preservation cochlear implantation, and implantation for unilateral deafness are described. Lastly, innovative technology is discussed, including the hybrid cochlear implant and the totally implantable cochlear implant.

  1. Comparison of Implant Stability Before Prosthetic Loading of Two Dental Implant Systems

    OpenAIRE

    Lagdive, Sanjay Balaji; Lagdive, Sushma Sanjay

    2013-01-01

    Dental implantology is the state of the art technique to replace missing teeth. Implant stability of implant jeopardizes its longevity and success of treatment. This study evaluates the implant stability of implant before and after 4 months of the implant placement, but before prosthetically loading it. Ten two-stage implants of Life care and Nobel Biocare dental implants were placed in 20 patients. Digital OPG was taken on the day of implant placement. After 4 months, at the time of second s...

  2. Materials for endosseous dental implants.

    Science.gov (United States)

    Wataha, J C

    1996-02-01

    The goal of placement of endosseous dental implants is to achieve osseointegration or biointegration of the bone with the implant. A wide variety of materials has been used for these implants, but only a few promote osseointegration and biointegration. Titanium and titanium alloy (Ti6A14V) have been the most widely used of these materials. The surface oxide of titanium appears to be central to the ability of this material to osseointegrate. The oxide limits dissolution of elements and promotes the deposition of biological molecules which allow bone to exist as close as 30 A to the surface of the implant. The details of the ultrastructure of the gap between the implant and bone remain undefined, and the consequences of elements which are released on the interface over time are not known. These areas of investigation are particularly important in defining the differences between commercially pure titanium implants and those made of titanium, aluminium and vanadium. The epithelial interface between the gingiva and titanium appears to contain many of the structural characteristics of the native tooth-gingiva interface, but details are still vague. The connective tissue interface with the titanium appears to be one of tightly fitting tissues rather than adhesion. Ceramic coatings appear to improve the ingrowth of bone and promote chemical integration of the implant with the bone. The characteristics of these coatings are complex and affect the bony response, but the mechanisms remain obscure. The degradation of the coatings is an issue of particular controversy. Progress in dental implantology is likely to continue as the interface between the material and bone is more clearly understood, and biological molecules and artificial tissues are developed.

  3. Biomimetic implant coatings.

    Science.gov (United States)

    Eisenbarth, E; Velten, D; Breme, J

    2007-02-01

    Biomaterials and tissue engineering technologies are becoming increasingly important in biomedical practice, particularly as the population ages. Cellular responses depend on topographical properties of the biomaterial at the nanometer scale. Structures on biomaterial surfaces are used as powerful tools to influence or even control interactions between implants and the biological system [; ]. The influence of nanometer sized surface structures on osteoblastlike cell interactions was tested with niobium oxide coatings on polished titanium slices (cp-Ti grade 2). The aim of the study was to investigate the influence of nanoscopic surface structures on osteoblast interactions in order to support collagen I production and cell adhesion. The coatings were done by means of the sol-gel process. The surface structure was adjusted by annealing of the metaloxide ceramic coatings due to temperature depended crystal growth. The applied annealing temperatures were 450, 550 and 700 degrees C for 1 h, corresponding to Ra-numbers of 7, 15 and 40 nm. The surfaces were characterized by means of AFM, DTA/TG, diffractometry and white light interferometry. The cell reactions were investigated concerning adhesion kinetics, migration, spreading, cell adhesion, and collagen I synthesis. The smooth surface (Ra=7 nm) resulted in the fastest cell anchorage and cell migration. The closest cell adhesion was reached with the surface structure of Ra=15 nm. The roughest surface (Ra=40 nm) impedes the cell migration as well as a proper spreading of the cells. The best results concerning cell adhesion and spreading was reached with an intermediate surface roughness of Ra=15 nm of the niobium oxide coating on cp-titanium slices. PMID:16828342

  4. Multicomponent Implant Releasing Dexamethasone

    Science.gov (United States)

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

    2008-02-01

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

  5. 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

  6. 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.

  7. Is a radiolucent breast implant needed

    International Nuclear Information System (INIS)

    Over 1 million American women have undergone augmentation mammoplasty. The silicone implants used create numerous technical difficulties during mammography. An American College of Radiology mammography phantom was used to assess the effect prototype implants have on resolution of microcalcifications and masses. Implants filled with silicone gel and/or saline had equal radiodensity and obscured all phantom artifacts. Implants filled with peanut oil and sunflower oil had equal radiolucency and allowed visualization of microcalcifications and several masses. The implant filled with gelatin was of intermediate radiodensity. A more radiolucent breast implant is possible, and further research is needed to define the best filter material and test its biocompatibility

  8. Implantable biomedical devices on bioresorbable substrates

    Science.gov (United States)

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

    2014-03-04

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

  9. 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.

  10. Carga inmediata con implantes en maxilar superior Immediate loading of implants in the maxilla

    Directory of Open Access Journals (Sweden)

    F. Monje Gil

    2007-08-01

    Full Text Available La carga inmediata en la mandíbula se ha incorporado a la práctica clínica en primer lugar y, por las características del hueso, se realiza de forma protocolizada. Sin embargo, en el maxilar superior no hay evidencia científica para realizarlo de forma cotidiana. Las razones son debidas a que el maxilar superior, en general, alberga una masa ósea de menor densidad. Por otro lado, en el maxilar superior pueden coexistir diferentes densidades óseas (según la clasificación de Misch en el mismo individuo. Además, por las características anatómicas del maxilar superior (reabsorción labiopalatina el alineamiento axial es asumible pero, sin embargo, el paralelismo de los implantes es difícil.16,17 El objetivo del presente trabajo es analizar la información científica de la que disponemos para confirmar si es posible la carga inmediata sobre el maxilar superior. Para ello estudiaremos varios aspectos de la carga inmediata en el maxilar superior: • Sobredentaduras • Prótesis fija completa • Prótesis parcial fija • Prótesis unitaria fija • Requerimientos protésicos • ContraindicacionesImmediate loading in the mandible has been introduced into clinical practice taking first place and, and because of the characteristics of the bone, this is carried out following a protocol. However, in the maxilla there is no scientific evidence for routinely carrying this out. This is because the maxilla, in general, has a lower bone mass density. Moreover, in the maxilla various densities may coexist (according to Misch’s classification in the same individual. In addition, given the anatomic characteristics of the maxilla (lip and palate resorption, axial alignment can be carried out, but implant parallelism is difficult.16,17 The aim of this paper is to analyze the scientific information that we have at our disposal in order to confirm whether immediate loading in the maxilla is possible. For this we will study various aspects of

  11. Surgical Complications of Cochlear Implantation

    Directory of Open Access Journals (Sweden)

    Basir Hashemi

    2010-03-01

    Full Text Available Cochlear implantation is a method used for the treatment ofpatients with profound hearing loss. This procedure may theaccompanied by some major or minor complications. Weevaluated the surgical complications of cochlear implantationin Fars province (south of Iran. A total of 150 patients withcochlear implantation were enrolled in the present study. Mostof the patients were pre-lingual children and most of our deviceswere nucleus prosthesis. We had three device failuresand four major complications, including one misplaced electrode,one case of meningitis, one case of foreign body reactionto suture and one case with extensive hematoma. Thesecomplications were managed successfully by surgical interventionor re-implantation. Facial nerve damage or woundbreakdown was not seen. Minor complications including smallhematoma, edema, stitch infection and dizziness were found in15 cases, which were managed medically. In our center, therate of minor complications was comparable to other centersin the world. But the rate of major surgical complications waslower than other centers.

  12. Developmental neuroplasticity after cochlear implantation.

    Science.gov (United States)

    Kral, Andrej; Sharma, Anu

    2012-02-01

    Cortical development is dependent on stimulus-driven learning. The absence of sensory input from birth, as occurs in congenital deafness, affects normal growth and connectivity needed to form a functional sensory system, resulting in deficits in oral language learning. Cochlear implants bypass cochlear damage by directly stimulating the auditory nerve and brain, making it possible to avoid many of the deleterious effects of sensory deprivation. Congenitally deaf animals and children who receive implants provide a platform to examine the characteristics of cortical plasticity in the auditory system. In this review, we discuss the existence of time limits for, and mechanistic constraints on, sensitive periods for cochlear implantation and describe the effects of multimodal and cognitive reorganization that result from long-term auditory deprivation. PMID:22104561

  13. 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

  14. Treatment of Infected Facial Implants.

    Science.gov (United States)

    Mohan, Kriti; Cox, Joshua A; Dickey, Ryan M; Gravina, Paula; Echo, Anthony; Izaddoost, Shayan A; Nguyen, Anh H

    2016-05-01

    Alloplastic facial implants have a wide range of uses to achieve the appropriate facial contour. A variety of materials such as metals, polymers, ceramics and synthetic injectable fillers are available to the reconstructive and aesthetic surgeon. Besides choosing the right surgical technique and the adequate material, the surgeon must be prepared to treat complications. Infection is an uncommon but serious complication that can cause displeasing consequences for the patient. There are few references in literature regarding treatment and management of facial implant-related infections. This study aims to discuss the role of biofilm in predisposing alloplastic materials to infection, to provide a review of literature, to describe our own institutional experience, and to define a patient care pathway for facial implant-associated infection. PMID:27152100

  15. 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.

  16. Optical effects of ion implantation

    International Nuclear Information System (INIS)

    This book, the thirteenth in the series ''Cambridge Studies in Modern Optics,'' represents the first attempt to provide a detailed description of the factors and processes that govern the optical properties of ion implanted materials. It begins with a survey of the basic physics and practical methods involved, then goes on to discuss the topics of optical absorption and luminescence. The authors present the basic theory of optical waveguides and their analysis and examine how ion implantation can be used in the production of optical waveguides. The concluding chapter deals with the progress being made in the development of device-oriented waveguide structures and how ion implantation is being used to achieve these ends

  17. 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

  18. El maxilar inferior del Orden Lagomorpha como material de investigación en Implantología Experimental

    OpenAIRE

    A De Corral Escobar; FL Mesa Aguado; V Freiherr Von Forstner; FJ O´Valle Ravassa

    2002-01-01

    El propósito de este trabajo es presentar un nuevo modelo experimental para el estudio de implantes en la mandíbula del conejo por la cara inferior o región milohioidea, donde se encuentra un tejido óseo en forma triangular, constituido por hueso compacto en superficie y trabecular en profundidad, semejante al del tejido alveolar del maxilar humano, que puede ser de interés como una nueva localización para estudiar la osteointegración de implantes. Se utilizaron 12 conejos europeos machos de ...

  19. Mutation breeding by ion implantation

    Science.gov (United States)

    Yu, Zengliang; Deng, Jianguo; He, Jianjun; Huo, Yuping; Wu, Yuejin; Wang, Xuedong; Lui, Guifu

    1991-07-01

    Ion implantation as a new mutagenic method has been used in the rice breeding program since 1986, and for mutation breeding of other crops later. It has been shown, in principle and in practice, that this method has many outstanding advantages: lower damage rate; higher mutation rate and wider mutational spectrum. Many new lines of rice with higher yield rate; broader disease resistance; shorter growing period but higher quality have been bred from ion beam induced mutants. Some of these lines have been utilized for the intersubspecies hybridization. Several new lines of cotton, wheat and other crops are now in breeding. Some biophysical effects of ion implantation for crop seeds have been studied.

  20. FDA Approves Eye Implant for Aging Boomers

    Science.gov (United States)

    ... medlineplus/news/fullstory_159648.html FDA Approves Eye Implant for Aging Boomers Tiny lens reshapes cornea to ... 2016 THURSDAY, June 30, 2016 (HealthDay News) -- An implant that helps the aging eye focus on small ...

  1. FDA Approves Implant to Battle Opioid Addiction

    Science.gov (United States)

    ... gov/medlineplus/news/fullstory_159050.html FDA Approves Implant to Battle Opioid Addiction Experts say steady dosing ... 26, 2016 (HealthDay News) -- A new long-acting implant that can help treat people addicted to heroin ...

  2. Dental implant surgery: planning and guidance

    International Nuclear Information System (INIS)

    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.)

  3. Proton implanted sapphire planar and channel waveguides

    NARCIS (Netherlands)

    Laversenne, L.; Crunteanu, A.; Hoffmann, P.; Pollnau, M.; Moretti, P.; Mugnier, J.

    2003-01-01

    We report low-order transverse-mode planar waveguides in sapphire fabricated for the first time by proton implantation. The waveguides show good guiding properties without post-implantation annealing. Channel waveguiding was achieved by polyimide strip-loading.

  4. 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.

  5. Elderly Benefit from Using Implantable Defibrillators

    Science.gov (United States)

    ... org Learn More Elderly benefit from using implantable defibrillators June 17, 2013 Categories: Heart News Study Highlights: Older people may benefit from implantable cardioverter defibrillators (ICDs) as much as younger people. Overall health, ...

  6. Clinical management of implant prostheses in patients with bruxism

    OpenAIRE

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

    2012-01-01

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

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

    NARCIS (Netherlands)

    Oosterbos, Cornelis Johannes Maria

    2004-01-01

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

  8. Facts, theories and ideologies: Viola Klein and Sociology of Scientific Knowledge Hechos, teorías e ideología: Viola Klein y la sociología del conocimiento científico

    Directory of Open Access Journals (Sweden)

    Eulalia Pérez Sedeño

    2012-07-01

    Full Text Available

    Several studies on history, philosophy and sociology of science have demonstrated that science is not autonomous and value-neutral and its selfless search of truth is an ideal theoretical myth far from the real practice of science, which is an aggregate of social practices. Viola Klein was a pioneer in studying science using the same instruments and categories utilized in any other social practice. The aim of this work is to highlight her contributions to Sociology of Scientific Knowledge at a moment when this discipline was, at the most, incipient.

    Diversos estudios en historia, filosofía y sociología de la ciencia han mostrado que el carácter autónomo y valorativamente neutro de la ciencia y su búsqueda desinteresada de la verdad es, en el mejor de los casos, un mito ideal alejado de la práctica científica real, que es un conjunto de prácticas sociales. Viola Klein fue una pionera en estudiar la ciencia con los mismos instrumentos y categorías utilizados para cualquier otra práctica social. El objetivo de este trabajo es sacar a la luz sus aportaciones a la sociología del conocimiento científico, en un momento en el que esa disciplina era, como mucho, incipiente.

  9. La crisis del socialismo real. Semejanzas y diferencias entre las disidencias del Bloque del Este

    Directory of Open Access Journals (Sweden)

    María Dolores Ferrero Blanco

    2009-12-01

    Full Text Available Este artículo trata de las causas de la crisis del socialismo real en los países de Europa Centro-Oriental y las disidencias que surgieron frente al “modelo soviético”. En él se analizan la diversidad de sus orígenes y fundamentos teóricos; las alternativas políticas y socioeconómicas que pretendieron implantar y, finalmente, las consecuencias que se derivaron de los diferentes movimientos insurreccionales.___________________ABSTRACT:This paper deals with the causes of the real socialism’s crisis in the East Center European countries and the dissidences that arose in opposition to the “soviet model”. Here it analyses their differences in tehir origins and theoretical bases, the political and socic-economic alternatives they tried to implant and, finally, the consequences derived from the different insurrectional movements.  

  10. Corrección de la mama tuberosa solo con implantes anatómicos

    Directory of Open Access Journals (Sweden)

    A. Rancati

    2013-09-01

    Full Text Available Las mamas tuberosas, denominadas así por Rees y Aston, y también llamadas hernias del complejo areolar (Bass, Snoopy deformity (Gruber, mamas tubulares (Williams, hipoplasia del polo inferior (Brink o mamas de base estrecha (Puckett, son una malformacion en el desarrollo del volumen mamario en los cuadrantes inferiores con hernia areolar secundaria (placa areolar y músculo mamilar débiles, areola ancha y protruida (en la mitad de los casos, ascenso del surco submamario, mamas hipotróficas y raramente hipertróficas, con asimetrías en las dos terceras partes de las pacientes. Presentamos la estrategia quirúrgica adecuada para resolver esta patología utilizando solo implantes anatómicos de gel cohesivo sin necesidad de tallar colgajos glandulares. De esta manera, disminuimos la morbilidad quirúrgica, ofreciendo resultados estables y con alta satisfaccion por parte de las pacientes.

  11. 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)

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

    Science.gov (United States)

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

    2016-07-01

    The aim of the present study was to evaluate the success rate of failed implants re-implanted after surface treatment with CO2 laser. Despite the widespread use of dental implants, there are many incidents of failures. It is believed that lasers can be applied to decontaminate the implant surface without damaging the implant. Ten dental implants that had failed for various reasons other than fracture or surface abrasion were subjected to CO2 laser surface treatment and randomly placed in the maxillae of dogs. Three failed implants were also placed as the negative controls after irrigation with saline solution without laser surface treatment. The stability of the implants was evaluated by the use of the Periotest values (PTVs) on the first day after surgery and at 1, 3, and 6 months post-operatively. The mean PTVs of treated implants increased at the first month interval, indicating a decrease in implant stability due to inflammation followed by healing of the tissue. At 3 and 6 months, the mean PTVs decreased compared to the 1-month interval (P implant stability. The mean PTVs increased in the negative control group compared to baseline (P implants were significantly lower than control group at 3 and 6 months after implant placement (P implantation of failed implants in Jack Russell Terrier dogs after CO2 laser surface debridement is associated with a high success rate in terms of implant stability. PMID:27126410

  13. Effect of Implantation Machine Parameters on N+ ion Implantation for Upland Cotton (Gossypium hirsutum L.) Pollen

    Institute of Scientific and Technical Information of China (English)

    YUE Jieyu; YU Lixiang; WU Yuejin; TANG Canming

    2008-01-01

    Effect of parameters of ion implantation machine,including ion energy,total dose,dose rate,impulse energy and implantation interval on the pollen grains of upland cotton implanted with nitrogen ion beam were studied.The best parameters were screened out.The results also showed that the vacuum condition before the nitrogen ion implantation does not affect the pollen viability.

  14. Early Loaded Single Implant Reinforced Mandibular Overdenture

    OpenAIRE

    Nischal, K; Chowdhary, R.

    2016-01-01

    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. ...

  15. 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.

  16. Implant fractures: Rare but not exceptional

    OpenAIRE

    Sahitya Sanivarapu; Srinivas Moogla; Rupa Sruthi Kuntcham; Lakshmi Kanth Kolaparthy

    2016-01-01

    Fabrication of dentures aided with implants has become a preferred treatment option for rehabilitation of completely and partially edentulous patients when durability is concerned. Simulation to natural teeth in terms of esthetics and to a greater extent in function can be considered as key elements in the raise of implant dentistry worldwide. Despite its high success rate, therapy with osseointegrated dental implants is not free of complications. Implant failure can occur for other reasons, ...

  17. Factors affecting peri-implant tissue reactions

    OpenAIRE

    Hultin, Margareta

    2001-01-01

    Screw- shaped titanium implants are today routinely used m the substitution of lost teeth. In this thesis some of the biological factors related to the long-term survival and maintenance of dental implants were studied. The first arm of these studies was to evaluate the neutrophil activation around teeth and dental implants (Papers I & II). Secondly we wanted to evaluate the clinical radiographic and microbiological status of implants after long-term. function m partly e...

  18. Environmental standards for intraocular lens implantation.

    Science.gov (United States)

    Crawford, B A; Kaufman, D V

    1984-02-01

    Successful implantation of prosthetic devices depends upon their freedom from postoperative inflammation and infection. Techniques and lessons learned in orthopaedic and other implant surgery should be applied to intraocular lens implantation. The avoidance of contamination by particles and micro-organisms is one essential principle of the surgical procedure. Practical steps are described to reduce both types of contamination. These measures taken together are recommended for adoption as a standard of environmental safety for lens implantation.

  19. CT-based Individualized Medical Implant Design

    Institute of Scientific and Technical Information of China (English)

    叶铭; 朱晓峰; 主成焘; 孙坚

    2003-01-01

    Most implantation cases are implemented using implants selected from the available standard set, but in some cases, only those implants conforming to individual patient's skeletal morphology can serve the purpose. This paper proposes a new approach to design and fabricate custom-made exact-fit medical implants. With a real surgical case as the example,technical design details are presented; and three algorithms are given respectively for segmentation based on object features, triangular mesh defragmentation and mesh cutting.

  20. Assessing legal responsibility for implant failure.

    Science.gov (United States)

    Palat, M

    1991-04-01

    The number of malpractice suits related to implants has recently increased significantly, with awards that are among the largest in dentistry. This article discusses the principles involved in assessing liability for implant failure and the various clinical situations that can affect liability in implant practice. The author also provides a list of the interrogatories required of defendants in malpractice suits related to implants. PMID:1893392

  1. Detailed spectral analysis of decellularized skin implants

    Science.gov (United States)

    Timchenko, E. V.; Timchenko, P. E.; Volova, L. T.; Dolgushkin, D. A.; Shalkovsky, P. Y.; Pershutkina, S. V.

    2016-08-01

    The resutls of detailed analysis of donor skin implants using Raman spectroscopy method are presented. Fourier-deconvolution method was used to separate overlapping spectrum lines and to improve its informativeness. Based on the processed spectra were introduced coefficients that represent changes in relative concentration of implant components, which determines the quality of implants. It was established that Raman spectroscopy method can be used in assessment of skin implants.

  2. 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...

  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. An Uncommon Presentation of Breast Implant Rupture.

    Science.gov (United States)

    Koh, Eugene; Watson, David I; Dean, Nicola R

    2016-05-01

    Late periprosthetic seroma has lately been concerning for breast implant-associated anaplastic large cell lymphoma. The authors present an uncommon presentation of breast implant rupture with a seroma and skin rash forming 2 years after insertion of the implant. PMID:27579243

  5. 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 ...

  6. The Case for a Generic Implant Processor

    NARCIS (Netherlands)

    Strydis, C.; Gaydadjiev, G.N.

    2008-01-01

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

  7. Instrumented hip implants: electric supply systems.

    Science.gov (United States)

    Soares dos Santos, Marco P; Ferreira, Jorge A F; Ramos, A; Simões, José A O; Morais, Raul; Silva, Nuno M; Santos, Paulo M; Reis, M J C S; Oliveira, T

    2013-10-18

    Instrumented hip implants were proposed as a method to monitor and predict the biomechanical and thermal environment surrounding such implants. Nowadays, they are being developed as active implants with the ability to prevent failures by loosening. The generation of electric energy to power active mechanisms of instrumented hip implants remains a question. Instrumented implants cannot be implemented without effective electric power systems. This paper surveys the power supply systems of seventeen implant architectures already implanted in-vivo, namely from instrumented hip joint replacements and instrumented fracture stabilizers. Only inductive power links and batteries were used in-vivo to power the implants. The energy harvesting systems, which were already designed to power instrumented hip implants, were also analyzed focusing their potential to overcome the disadvantages of both inductive-based and battery-based power supply systems. From comparative and critical analyses of the methods to power instrumented implants, one can conclude that: inductive powering and batteries constrain the full operation of instrumented implants; motion-driven electromagnetic energy harvesting is a promising method to power instrumented passive and active hip implants. PMID:24050511

  8. La obligatoriedad del Departamento de Gestión Ambiental Empresarial y su marco normativo en Colombia

    Directory of Open Access Journals (Sweden)

    Ana Herrera Flórez

    2010-07-01

    Full Text Available ResumenLa Incidencia en la degradación del medio ambiente ha traído consigo que las empresas e industrias comiencen a concientizarse en el contexto de una nueva ética empresarial. Desde hace algunos años se ha hablado del concepto de Responsabilidad Social empresarial, no obstante, este proceso se veía muy alejado dentro del marco de lo ambiental, es por ello que desde la convención de Estocolmo se da vida a una serie de reglamentaciones internas en nuestro país que hace que las empresas comiencen a retomar su posición en la responsabilidad que les atañe; para referirse al proceso mediante elcual dichas empresas deciden voluntariamente contribuir al logro de una sociedad mejor y de un medio ambiente más limpio. Junto a esta línea de actuación, han surgido otros instrumentos que, asimismo, deben integrarse en esta nueva ética empresarial. El presente ensayo describe el estado en cuestión en nuestro Estado colombiano en cuanto a la obligatoriedad de mantener una oficina de Gestión Ambiental Empresarial Palabras claveResponsabilidad social, gestión empresarial, desarrollo sostenible, político del medio ambiente, normatividad.AbstractThe impact on environmental degradation has resulted in companies and industries begin to become aware in the context of a new business ethics. Now a days there has been explain the concept of business social responsibility, however, this process was very far within the framework of environmental, that is why from the Stockholm convention start a series of internal regulations in our country where companies begin to resume his position of responsibility as they are concerned, to refer to the process by which these companies decide voluntarily to contribute to a better society and a cleaner environment. Along this way of action, other instruments have emerged also be integrated into this new business ethics. This article describes the situation in our Colombian State regarding to

  9. del cambio

    Directory of Open Access Journals (Sweden)

    Alejandro Canales

    2006-01-01

    Full Text Available El artículo analiza las propuestas y los compromisos en materia de cobertura y de financiamiento en el periodo 2000-2006. En particular, revisa las modificaciones y los ajustes de los tres principales documentos en los que se expresaron las iniciativas: el de la Asociación Nacional de Universidades e Instituciones de Educación Superior, el del equipo de la transición y el programa sectorial. Los resultados muestran que las cifras de atención a la demanda educativa e inversión quedaron lejos de las metas autoimpuestas por el gobierno federal y que será necesario realizar mayores esfuerzos para atender tales desafíos.

  10. Chemical, Corrosion and Topographical Analysis of Stainless Steel Implants after Different Implantation Periods

    OpenAIRE

    Chrzanowski, Wojciech; Armitage, David Andrew; Knowles, Jonathan Campbell; Szade, Jacek; Korlacki, Wojciech; Marciniak, Jan

    2008-01-01

    Abstract The aim of this work is to examine the corrosion properties, chemical composition, and material?implant interaction after different periods of implantation of plates used to correct funnel chest. The implants are made of 316L stainless steel. Examinations are carried out on three implants: new (nonimplanted) and two implanted for 29 and 35 months. The corrosion study reveals that in the potential range that could occur in the physiological condition the new bar has the low...

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

    OpenAIRE

    Eda OZYILMAZ; Aykul, Halil; OZYILMAZ, Emre; Dalkiz, Mehmet; M. Burak BİLGİN

    2015-01-01

    The use of dental implants to solve different problems in dentistry has been growing rapidly. The success rates of dental implants are also very important for patients. Depending on the bone level of patients, short dental implants are very popular and widely used by many dentists. Although many dentists are using short dental implants frequently, It can be guessed that there can be stability problems because of crown to implant ratios. In this study, it is aimed to find out...

  12. Cortical plasticity after cochlear implantation

    DEFF Research Database (Denmark)

    Petersen, B; Gjedde, A; Wallentin, M;

    2013-01-01

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

  13. Cortical Plasticity after Cochlear Implantation

    Science.gov (United States)

    Petersen, B.; Gjedde, A.; Wallentin, M.; Vuust, P.

    2013-01-01

    The most dramatic progress in the restoration of hearing takes place in the first months after cochlear implantation. To map the brain activity underlying this process, we used positron emission tomography at three time points: within 14 days, three months, and six months after switch-on. Fifteen recently implanted adult implant recipients listened to running speech or speech-like noise in four sequential PET sessions at each milestone. CI listeners with postlingual hearing loss showed differential activation of left superior temporal gyrus during speech and speech-like stimuli, unlike CI listeners with prelingual hearing loss. Furthermore, Broca's area was activated as an effect of time, but only in CI listeners with postlingual hearing loss. The study demonstrates that adaptation to the cochlear implant is highly related to the history of hearing loss. Speech processing in patients whose hearing loss occurred after the acquisition of language involves brain areas associated with speech comprehension, which is not the case for patients whose hearing loss occurred before the acquisition of language. Finally, the findings confirm the key role of Broca's area in restoration of speech perception, but only in individuals in whom Broca's area has been active prior to the loss of hearing. PMID:24377050

  14. Reading skills after cochlear implantation

    NARCIS (Netherlands)

    Vermeulen, Agnes Maria

    2007-01-01

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

  15. Digital planning of cranial implants

    NARCIS (Netherlands)

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

    2013-01-01

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

  16. Carbon coatings for medical implants

    Directory of Open Access Journals (Sweden)

    K. Bakowicz-Mitura

    2007-01-01

    Full Text Available Purpose: In this paper we report in vitro and in vivo results of Nanocrystalline Diamond Coatings whichare used in medicine onto medical implants The very important property of carbon coatings is the protectionliving organism against the metalosis. Different medical implants with complicated shapes are covering byNanocrystalline Diamond Coatings by RF dense plasma CVD.Design/methodology/approach: 1 Material characterizations of deposited coatings have been evaluated by using:Transmission Electron Microscopy (TEM, Scanning Electron Microscopy (SEM, Atomic Force Microscopy(AFM, Auger electron spectroscopy (AES, microX-Ray Spectroscopy and bend test 2 Biological investigationbased on: (a in vivo and (b in vitro examinations as well (c clinical investigations – contact allergy.Findings: It was revealed that Nanocrystalline Diamond Coatings form the barrier diffusion between implantand human environment as a consequence prevent leaching of metallic ions into the body. Additionally, theresearch on carbon coatings proved that diamond layers are biocompatible with living organism. Contact allergyon nickel is inhibited by diamond powders.Practical implications: Practical application metal implants with NCD in orthopedy, cardiosurgery, oralsurgery, maxillo-facial surgery and dermatology.Originality/value: We have observed anti-inflammatory, antiallergic and anticancerogenic responses from thecarbon coatings layers onto medical implants like wires and screws.

  17. Immediate loading of dental implants.

    Science.gov (United States)

    Henry, P J; Liddelow, G J

    2008-06-01

    The purpose of this review is to explore the concept of immediate loading as it pertains to dental implants and the indications for clinical practice. The definition of immediate loading will be considered together with a review of the relevant literature in an attempt to provide evidence-based guidelines for successful implementation into practice. A search of electronic databases including Medline, PubMed and the Cochrane Database of Systematic Reviews was undertaken using the terms "immediate loading'', "dental implants'', "immediate function'', "early loading'', "oral implants'', "immediate restoration'' and "systematic review''. This was supplemented by handsearching in peer-reviewed journals and cross-referenced with the articles accessed. Emphasis was given to systematic reviews and controlled clinical trials. A definition of immediate loading was suggested pertinent to the realities of logistics in clinical practice with respect to application and time frame. The literature was evaluated and shown to be limited with significant shortcomings. Guidelines and recommendations for clinical protocols were suggested and illustrated by examples of case types with a minimum of 1-3 years follow-up. A list of additional references for further reading was provided. Within the limitations of this review, there is evidence to suggest that immediate loading protocols have demonstrated high implant survival rates and may be cautiously recommended for certain clinical situations. However, more high level evidence studies, preferably randomized controlled trials (RCTs), over a long time frame are required to show a clear benefit over more conventional loading protocols.

  18. Annealing of ion implanted silicon

    International Nuclear Information System (INIS)

    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 12000C and boron up to 9500C. 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 10500C. (U.K.)

  19. Sobredentaduras mandibulares sobre dos implantes en pacientes edéntulos totales: un estudio a tres años

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2015-12-01

    Full Text Available Introducción: En la actualidad, la implantología oral constituye una modalidad terapéutica en el tratamiento prostodóncico de los pacientes mayores edéntulos totales. El estudio muestra la evaluación del tratamiento con sobredentaduras mandibulares mediante la carga precoz de implantes dentales. Métodos: Treinta pacientes edéntulos totales fueron tratados con 60 implantes con superficie arenada y grabada Galimplant® en la mandíbula para su rehabilitación prostodóncica con sobredentaduras. Dos implantes fueron insertados en cada paciente. Los implantes fueron cargados funcionalmente tras un periodo de tiempo de 6 semanas con retenedores de fricción. Los hallazgos clínicos (implantológicos y prostodóncicos se han seguido durante al menos 24 meses. Resultados: Los resultados indican una supervivencia y éxito de los implantes del 98,3%. Durante el periodo de cicatrización libre de carga funcional, se perdió un implante por movilidad. La pérdida de hueso marginal media fue de 0,4 mm (0-1,1 mm. El 100% de los pacientes fueron tratados mediante una sobredentadura implantorretenida con anclajes de fricción. En cuatro pacientes se realizaron cambios en los componentes plásticos de los ataches. El seguimiento clínico medio fue de 40,8 meses (24-60 meses. Conclusiones: Los resultados del presente estudio indican que la rehabilitación prostodóncica mediante la carga precoz con sobredentaduras con implantes de los pacientes edéntulos mandibulares representa una terapéutica implantológica con éxito.

  20. 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). PMID:26701919

  1. La carga inmediata de implantes transicionales en sobredentaduras mandibulares en adultos mayores Inmediate loading of transitional implants in mandible overdentures of older adults

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2004-08-01

    Full Text Available Introducción. La implantología oral constituye una importante modalidad terapéutica en el tratamiento prostodóncico de los pacientes con pérdida dental total. El estudio muestra la evaluación de los pacientes edéntulos totales tratados con sobre dentaduras mandibulares mediante la carga inmediata de los mini implantes de titanio con superficie grabada con ácidos. Métodos. 18 pacientes edéntulos totales fueron tratados con 72 mini implantes transicionales Sendax® en la mandíbula para su rehabilitación prostodóncica con sobre dentaduras. Todos los implantes fueron insertados en 1 cirugía y fueron cargados inmediatamente en la misma sesión. Los hallazgos clínicos (implantológicos y prostodóncicos se han seguido al menos durante 12 meses. Resultados. Después de un seguimiento clínico medio de 20,8 meses (rango: 12-48 meses, los resultados indican un éxito de los implantes del 97,3% porque 2 implantes fracasaron. El 100% de los pacientes fueron tratados con una sobredentadura implantosoportada con retenedores de bolas sobre 4 implantes. Conclusiones. Los resultados del presente estudio indican que la rehabilitación prostodóncica de la mandíbula con sobre dentaduras implantosoportadas de los pacientes edéntulos mediante la carga inmediata de implantes transicionales de titanio pueden obtener la oseointegración y representar una terapéutica odontológica con éxito.Introduction. Oral implantology constitute an important therapeutic modality in the prosthodontic treatment of patients with total tooth loss. This study reports the evaluation of edentulous patients treated with overdentures in the mandible by immediate loading of titanium miniimplants with acid-etched surface. Patients and Methods. 18 edentulous patients were treated with 72 Sendax® transitional mini implants for prosthodontic rehabilitation with overdentures in the mandible. All implants were inserted in one-stage and were loaded immediately. Clinical findings

  2. Breast fibromatosis associated with breast implants.

    Science.gov (United States)

    Seo, Yoon Nae; Park, Young Mi; Yoon, Hye Kyoung; Lee, Sun Joo; Choo, Hye Jung; Ryu, Ji Hwa

    2015-09-01

    Fibromatosis refers to an extra-abdominal desmoid tumor or aggressive fibromatosis. Breast fibromatosis can develop in association with the capsule around a breast implant, although reports of cases of fibromatosis associated with breast implants are rare. As the demand for breast augmentation has increased, it is important to understand the diseases associated with breast implants. In the present report, we describe a case of breast fibromatosis that developed adjacent to a breast implant and demonstrated a relatively well-defined border even though it invaded the surrounding structures. We also explore the specific imaging features for diagnosing breast fibromatosis in association with implants by reviewing previous literature.

  3. 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.

  4. Choice of a dental implant system.

    Science.gov (United States)

    Hunt, Peter R; Gartner, Judith L; Norkin, Frederic J

    2005-04-01

    Many dentists are bewildered by the intricacies and complexities of dental implants. They are constantly besieged by product advertisements and can find it difficult to choose which systems to work with. Some dentists are so intimidated by the subject that they choose to avoid getting involved with implants and instead stick to traditional tooth replacement systems. By breaking implants down into 4 main components, the body, collar, connection, and restorative post, it is easier to understand the structure and function of dental implants. Each portion should be designed to achieve certain objectives. Once these structural components are understood, it is easier to compare and contrast differing implant systems.

  5. Stoichiometric disturbances in ion implanted silicon carbide

    Energy Technology Data Exchange (ETDEWEB)

    Morvan, E.; Monserrat, J.; Rebollo, J.; Flores, D.; Jorda, X. [Centro Nacional de Microelectronica, Barcelona (Spain); Locatelli, M.L.; Ottaviani, L. [CEGELY ECPA, INSA de Lyon, Villeurbanne (France)

    1998-08-01

    Monte Carlo simulations of stoichiometric disturbances induced by ion implantation into 6H-SiC single crystal are presented. By following the recoils trajectories during the implantation simulation it is possible to construct C and Si related point defects distributions, which in turns give the post implantation stoichiometry of the SiC crystal. The results show net concentrations of ``stable`` point defects and stoichiometric disturbances of the order of the chemical concentration of the implanted impurity. This phenomenon could play an important role during subsequent annealing steps. Some practical examples of ion implantation are simulated and discussed. (orig.) 4 refs.

  6. Estudo molecular em crianças candidatas e submetidas ao implante coclear Molecular investigation in children candidates and submitted to cochlear implantation

    Directory of Open Access Journals (Sweden)

    Raquel Bernardes

    2006-06-01

    Full Text Available OBJETIVOS: recentes progressos obtidos na biologia molecular vêm possibilitando a identificação da etiologia da surdez. A alta prevalência de mutações no gene da conexina 26 e sua facilidade de estudo possibilitam o diagnóstico. A mutação mais freqüente neste gene é a chamada 35delG. O objetivo do presente trabalho foi averiguar a incidência da mutação 35delG em crianças candidatas e submetidas ao implante coclear que tiveram a surdez diagnosticada como, supostamente idiopática. MATERIAL E MÉTODO: Estudo realizado no Setor de Implantes Cocleares da Disciplina de Otorrinolaringologia e no Laboratório Genética Humana-CBMEG, UNICAMP-SP. Foram avaliadas 32 crianças candidatas e usuárias de implante coclear, apresentando perda auditiva neurossensorial severa a profunda bilateral. Para a detecção da mutação 35delG foi utilizada a técnica de PCR alelo-específico (AS-PCR, usando primers e reação em cadeia da polimerase. RESULTADOS: 69% apresentaram exame normal, 12% foram homozigotos e 19% dos casos foram heterozigotos. A mutação 35delG em heterozigose não diagnostica a causa da surdez apenas comprova que o paciente é portador dessa mutação. CONCLUSÃO: No presente estudo, os dados obtidos confirmaram a alta prevalência da mutação 35delG no gene GJB2 em casos de perda auditiva neurossensorial não-sindrômica bilateral profunda, resultado que concorda com a literatura. Foi possível, também, diagnosticar como genética a causa da surdez em uma parcela significativa de crianças. Estes dados reforçam a importância do estudo molecular em pacientes com surdez de origem supostamente idiopática, uma vez que esse exame possibilita esclarecer a etiologia da perda auditiva.AIM: recent progresses in molecular biology have been made in the diagnosis of sensorineural hearing loss. The high prevalence of a connexin 26 gene mutation, and its easy identification have made the diagnosis possible. The most frequent gene

  7. 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.

  8. [Metal implant sensitivity: clinical and histological presentation].

    Science.gov (United States)

    Hartmann, D; Letulé, V; Schneider, J J; Flaig, M J

    2016-05-01

    Metal implant sensitivity (intolerance) can cause pain, reduced mobility, loosening of the implant and skin rashes. Knowledge of differential diagnoses, histology and appropriate diagnostics are essential for proper diagnosis. To outline typical clinical signs and histology in metal-implant-associated skin lesions we present three exemplary patients from our implant allergy outpatient department and give an overview of the current literature regarding metal implant sensitivity. In patients with a negative patch test the lymphocyte transformation test may reveal metal sensitization. Even "pure" titanium alloys may contain traces of nickel. The histology of implant-associated skin reactions goes from teleangiectatic postimplantation erythema to eczema and vasculitis. Based on the synopsis of history, clinical picture, allergological testing and histology, metal implant sensitivity can be diagnosed more precisely. PMID:27090521

  9. Implant failure: regional versus cumulative evaluation.

    Science.gov (United States)

    Lauc, T; Krnić, D; Katanec, D

    2000-07-01

    In this paper the success rate of implant therapy in various bone regions is discussed. The objective is to determine whether differences existed in success rates of cylinder implants placed in different areas in the both maxilla and mandible. Forty four patients have been treated and reviewed five years after the placement of the fixed prosthetic restoration. The patients were provided with a total of 92 implants. Results from this study show very low survival rate for implants placed in anterior region of maxilla (55.6%) after five years. It is concluded that simple cumulative follow up studies do not entirely correspond to actual situations, positioning the implants has an important role in the planning of the implant therapy and that important factor for force compensation is not only the surrounding bone density, but also the region of the jaw where the implants are placed. PMID:10946471

  10. Implant fractures: Rare but not exceptional

    Directory of Open Access Journals (Sweden)

    Sahitya Sanivarapu

    2016-01-01

    Full Text Available Fabrication of dentures aided with implants has become a preferred treatment option for rehabilitation of completely and partially edentulous patients when durability is concerned. Simulation to natural teeth in terms of esthetics and to a greater extent in function can be considered as key elements in the raise of implant dentistry worldwide. Despite its high success rate, therapy with osseointegrated dental implants is not free of complications. Implant failure can occur for other reasons, with implant fracture being one of the major reasons for late failure. Although the incidence of implant fractures may be low, it invariably effects the patient and also clinician. Thus, sound evidence based knowledge of cause of fracture is mandatory for that careful treatment that can reduce the incidence of fracture helping in a better treatment plan. The aim of this review is to enlighten the various causes of implant fracture.

  11. Implant fractures: Rare but not exceptional.

    Science.gov (United States)

    Sanivarapu, Sahitya; Moogla, Srinivas; Kuntcham, Rupa Sruthi; Kolaparthy, Lakshmi Kanth

    2016-01-01

    Fabrication of dentures aided with implants has become a preferred treatment option for rehabilitation of completely and partially edentulous patients when durability is concerned. Simulation to natural teeth in terms of esthetics and to a greater extent in function can be considered as key elements in the raise of implant dentistry worldwide. Despite its high success rate, therapy with osseointegrated dental implants is not free of complications. Implant failure can occur for other reasons, with implant fracture being one of the major reasons for late failure. Although the incidence of implant fractures may be low, it invariably effects the patient and also clinician. Thus, sound evidence based knowledge of cause of fracture is mandatory for that careful treatment that can reduce the incidence of fracture helping in a better treatment plan. The aim of this review is to enlighten the various causes of implant fracture. PMID:27041830

  12. Regeneración ósea guiada con implante unitario con nanosuperficie y betafosfato tricálcico Guided bone regeneration with nanosurface single-tooth implant and beta-tricalcium phosphate

    Directory of Open Access Journals (Sweden)

    J. Pato Mourelo

    2010-12-01

    Full Text Available Introducción. El objetivo del presente caso clínico era mostrar los resultados del tratamiento con implantes dentales mediante regeneración ósea guiada. Caso clínico. Un varón de 32 años es valorado para tratamiento implantológico del incisivo central superior derecho perdido. El plan de tratamiento comprende la eliminación de un quiste periapical residual, inserción de forma sumergida de un implante unitario con nanosuperficie Galimplant® y regeneración ósea guiada con membrana de colágeno reabsorbible BioGide® y betafosfato tricálcico KeraOs® como material de injerto. Después de 8 meses se realiza una segunda cirugía con colocación de un tornillo de cicatrización. Después de 2 semanas, se realiza la carga funcional del implante con una corona unitaria cementada. Después de un periodo de carga funcional de 12 meses, no ha habido complicaciones. Conclusiones. Este caso clínico indica que el tratamiento con implantes dentales mediante la técnica de regeneración ósea guiada constituye una terapéutica implantológica con éxito.Introduction. The aim of this clinical case was to report the outcome of treatment with a dental implant by guided bone regeneration. Clinical case. A 32-year man is diagnosed for implant treatment of the upper central right incisive loss. Treatment planning including elimination of residual periapycal cyst, submerged insertion of a Galimplant® nanosurface implant and guided bone regeneration with BioGide® resorbable collagen membrane and betatricalcium phosphate KeraOs® grafting. After a time period of 8 months, a second surgical stage were realized with the healing screw. After two weeks, implant were loaded with a cemented fixed single-crown. Not complications were observed after a 12 months follow-up. Conclusions. This clinical case indicate that treatment with dental implant by guided bone regeneration constitute a successful treatment.

  13. Peri-implant soft tissue augmentation with a porcine collagen matrix.

    Directory of Open Access Journals (Sweden)

    Yuri Castro

    2014-12-01

    Full Text Available Resumen: Una buena cantidad y grosor de tejido queratinizado alrededor de implantes ha sido asociado con una mejor salud periimplantaria, menos pérdida ósea y una mejora en la estética. El propósito de este caso clínico fue evaluar un nuevo xenoinjerto de origen porcino (matriz de colágeno al ser utilizada como un injerto interposicional para aumentar el grosor de la mucosa periimplantaria. Son pocos los estudios que utilizan la matriz de colágeno como sustituto del injerto conectivo subepitelial alrededor de implantes. El caso clínico incluyó un implante a nivel de la pieza 15, en el cual durante la colocación del pilar de cicatrización se aprovechó para engrosar la mucosa periimplantaria utilizando una matriz de colágeno. Se obtuvo un aumento de grosor de 1,5mm manteniéndose la cantidad de mucosa queratinizada de 4mm. Se concluyó que la matriz de colágeno de origen porcino es una buena alternativa para aumentar el grosor de la mucosa periimplantaria, además de reducir la morbilidad, ser de fácil manejo y de fácil sutura. Abstract: A good amount and width of keratinized tissue around implants has been associated with better health periimplant, less bone loss and improved aesthetics. The purpose of this case was to evaluate a new porcine xenograft (collagen matrix when used as an interpositional graft to increase the thickness of the peri-implant mucosa. Few studies using the collagen matrix as a substitute for subepithelial connective graft around implants are. The case involved an implant clinical at level of teeth 15 during placement of scar took the opportunity to swell the peri-implant mucosa with the collagen matrix. An increase in thickness of 1.5 mm while maintaining the amount of keratinized mucosa 4mm was obtained. We conclude that the collagen matrix of porcine origin is a good alternative to increase the thickness of the peri-implant mucosa and reduce morbidity, be easy to handle and easy to suture.

  14. Surface characterization of titanium based dental implants

    International Nuclear Information System (INIS)

    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 (TiO2), another oxides as Ti O and Ti2O3 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 examinations did not

  15. [Evaluation of asymetric implants in breast cancer].

    Science.gov (United States)

    Fitoussi, A; Couturaud, B; Laki, F; Alran, S; Salmon, R J

    2005-10-01

    Since more than twenty years, methods of breast reconstruction using implants have continued to evolve in order to improve their aesthetic results. Shapes and materials of these implants have also evolved to obtain contours similar to that of the natural opposite breast. Therefore it can be considered that the use of asymmetric implants is the last step in implant technology before using made to measure implants. Asymmetric implants allow obtaining different contours in harmony to the different breast shapes according to the side, left or right, of the reconstructed breast which maximise the naturalness of the result. Such implants have an axis directed towards the exterior and lower part of the chest wall, are wider than high with a thinner part on their inner edge and a concave rear side moulding the curves of the chest wall. In our own experience, we placed more than 500 asymmetric implants. When analysing retrospectively the medical records of 156 patients, no distinctive features were observed when compared to symmetric classic implants in easiness in the surgical procedure or in complications except a slightly higher rate of seroma formation. When compared to usual implants the main benefits of asymmetric implants are: to offer a wider breadth, to slope down gently on their upper and inner sides according to their concave rear side, and therefore to better match subtle curves of a normal breast. Moreover such contours allow a distribution of the volume which fit better to the usual natural breast configuration of patients who underwent surgery for breast carcinoma. At last, such implants are easy to place and a very low rate of secondary rotation has been observed. In summary, for all these reasons, asymmetric implants, can be considered to be the class one in the choice of implants for breast reconstruction after breast surgery. PMID:16198040

  16. Effects of Delayed Second Cochlear Implant

    Institute of Scientific and Technical Information of China (English)

    XIA Rui-ming; WU Xi-hong; JANG Zi-gang; JING Yuan-yuan; LIN Yun-juan; YU Li-sheng

    2006-01-01

    Objective Since Helms' successful bilateral cochlear implantation with good results in 1996, there have been increasing number of reports on bilateral cochlear implantation. Most second device have been implantated within one year after the first. Considering effects of long time auditory deprivation, it is not clear whether a delayed second cochlear implant serves to add additional benefits and how it may interact with central nervous system plasticity. Methods Three cases who received delayed second cochlear implants at People's Hospital of Peking University from 2002 to 2005 were reviewed. The interval between the first and second implants was longer than 2 years in all three patients. Sound perception, and unilateral/bilateral speech discrimination in quiet and noise were evaluated. In addition, GAP detection test was conducted in one patient. Results In one case,having both implants on provided improved performance compared to using only one implant both in quiet and noise. Presumably due to visual interference from lip-reading or short interval between second implant and testing,one patient showed no improvement from using the second implant either in quiet or noise, while the last case demonstrated additional benefits from the second implant only in quiet. In all three patients, performance in recognizing the four tones in Mandarin was superior over word recognition. Conclusions Considerable plasticity in the cerebral auditory center is preserved, despite long acoustic deprivation in some children who have received unilateral cochlear implant. Delayed second implants can result in significant improvements in some of these children. Visual interference from lip-reading may be an obstacle during retraining. The better recognition of tones in the Mandarin language may represent a different sound discrimination mechanism in the auditory system,although it may also be related to the signal processing mechanisms of the implant used (MED-EL COMBI 40+).

  17. Mini vs. Standard Implants for Mandibular Overdentures: A Randomized Trial.

    Science.gov (United States)

    de Souza, R F; Ribeiro, A B; Della Vecchia, M P; Costa, L; Cunha, T R; Reis, A C; Albuquerque, R F

    2015-10-01

    A mandibular implant-retained overdenture is considered a first-choice treatment for edentulism. However, some aspects limit the use of standard implants-for example, the width of edentulous ridges, chronic diseases, fear, or costs. This randomized trial compared mandibular overdentures retained by 2 or 4 mini-implants with standard implants, considering oral health-related quality of life (OHRQoL), patient satisfaction, and complications such as lost implant. In sum, 120 edentulous men and women (mean age, 59.5 ± 8.5 y) randomly received 4 mini-implants, 2 mini-implants, or 2 standard implants. Participants provided data regarding OHRQoL and satisfaction until 12 mo. Clinical parameters, including implant survival rate, were also recorded. Both 2 and 4 mini-implants led to better OHRQoL, compared with 2 standard implants. Treatment with 4 mini-implants was more satisfying than 2 standard implants, with 2 mini-implants presenting intermediate results. Implant survival rate was 89%, 82%, and 99% for 4 mini-implants, 2 mini-implants, or 2 standard implants, respectively. Overdentures retained by 4 or 2 mini-implants can achieve OHRQoL and satisfaction at least comparable with that of 2 standard implants. However, the survival rate of mini implants is not as high as that of standard implants (ClinicalTrials.gov NCT01411683). PMID:26294416

  18. 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.

  19. Carga inmediata de implantes monofásicos postextracción utilizando los expansores roscados atraumáticos: estudio retrospectivo 2001-2011

    Directory of Open Access Journals (Sweden)

    Riham Mostafa Eldibany

    2015-10-01

    Conclusiones: Tras haber analizado toda la secuencia referida a la carga inmediata, podemos concluir que los implantes monofásicos insertados con la aplicación de esta técnica son un procedimiento predecible: su éxito en el maxilar inferior en nuestro estudio de 10 años fue del 98%. Sin embargo, es necesario determinar los casos candidatos para dicho procedimiento, así como las características del implante que favorecen la implantación inmediata.

  20. Tratamiento de pacientes parcialmente edéntulos con prótesis dentoimplantosoportadas Treatment of partial edentulous patiens wise prothesis dento implants supported

    Directory of Open Access Journals (Sweden)

    L. Cañada Madinazcoitia

    2001-04-01

    Full Text Available Un problema con el que nos encontramos cuando hacemos la planificación del paciente parcialmente desdentado, es si al colocar los implantes sería correcto unirlos a los dientes adyacentes o no. Este dilema se debe a la diferente movilidad que tienen el diente natural con su ligamento periodontal y el implante osteointegrado. Brunski publicó estas diferencias en intrusión del diente y el implante. Sin embargo, hay numerosos beneficios de unir ambos pilares, entre los que podemos citar: necesitaremos menor número de implantes, lo cual puede ser determinante para poder tratar al paciente o no, tendrá un coste económico menor; se obtendrá una mejor propiocepción de la restauración que si la prótesis es de soporte exclusivamente implantario. En el presente artículo hacemos una amplia revisión bibliográfica que nos indique qué soporte científico hay para poder utilizar clínicamente la conexión diente con implante y, si se puede, cómo debe ser esta unión, rígida o no rígida. Tenemos que tener en cuenta que hay muchas variables a considerar en este tipo de pacientes en los que vamos a unir un diente con un implante, por eso deberemos ser cuidadosos a la hora de extrapolar los resultados publicados a todas las situaciones clínicas que se nos presentan en nuestras consultas, porque la distribución de cargas varía de una forma significativa en función del estado periodontal del diente y del grado de osteointegración del implante. Es decir, para la decisión final de qué tipo de tratamiento debo utilizar, será el clínico el que tendrá que sopesar la situación de los diferentes pilares antes de tomar la decisión final.The problem founded when restoring partially edentulous patients with osseointegrated implants is whether the implants should be connected to, or separated from the natural teeth. This dilemma is caused by the difference in mobility of teeth and osseointegrated implants. Brunski reported differences in intrusive

  1. del discurso

    Directory of Open Access Journals (Sweden)

    Alexander Mosquera

    2006-01-01

    Full Text Available En varios comunicados quedó reflejada la tensión de la reciente crisis entre Colombia y Venezuela, suscitada a raíz de la captura en diciembre de 2004 de un guerrillero de la FARC en Caracas (Rodrigo Granda. El presente trabajo es un avance de un proyecto de investigación, que persigue como objetivos: 1 describir el discurso implícito en dichos comunicados; 2 identificar los aspectos semánticos y pragmáticos presentes en la confrontación discursiva; y 3 delinear el componente ideológico reflejado en los comunicados. Para el respectivo análisis se siguieron algunos aspectos teóricos y metodológicos de Colle (2000, Bolívar (1998 yMolero de Cabeza (1985. Entre las conclusiones preliminares de este avance se tiene que, con el caso Granda, Colombia recurrió a la vieja política del "fin justifica los medios", a la vez que puso en entredicho el papel de Venezuela en la lucha contra el terrorismo, quizás como respuesta a su política exterior de estrechos vínculos con el gobierno estadounidense

  2. [Implantation of the artificial retina].

    Science.gov (United States)

    Yagi, T; Hayashida, Y

    1999-05-01

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

  3. Design of an implantable micropump

    OpenAIRE

    Smal, Olivier; Merken, Patrick; Croquet, Vincent; Raucent, Benoît; Debongnie, Jean-François; Delchambre, Alain

    2004-01-01

    The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are limited by their rather expensive cost. The challenge is therefore to develop a low cost alternative by reducing the number of parts and by simplifying the assembly. As the pump and its tank will be placed under the skin in order to increase comfort, such a system should be small and reliable. In...

  4. Developmental Neuroplasticity After Cochlear Implantation

    OpenAIRE

    Kral, Andrej; Sharma, Anu

    2011-01-01

    Cortical development is dependent on stimulus-driven learning. The absence of sensory input from birth, as occurs in congenital deafness, affects normal growth and connectivity needed to form a functional sensory system—resulting in deficits in oral language learning. Cochlear implants bypass cochlear damage by directly stimulating the auditory nerve and brain, making it possible to avoid many of the deleterious effects of sensory deprivation. Congenitally deaf animals and children who receiv...

  5. Magnesium as Biodegradable Implant Material

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Drawbacks associated with permanent metallic implants lead to the search for degradable metallic biomaterials. Magnesium alloys have been highly considered as Mg has a high biocorrosion potential and is essential to bodies. In this study, corrosion behaviour of pure magnesium and magnesium alloy AZ31 in both static and dynamic physiological conditions (Hank's solution) has been investigated. It is found that the materials degrade fast at beginning, then stabilize after 5 days of immersion. High purity in th...

  6. Implantable telemetry for small animals

    Science.gov (United States)

    1982-03-01

    A series of totally implantable telemetry devices for use in measuring deep body parameters in small animals were developed. Under a collaborative agreement with NASA, several of these systems; the continuous wave Doppler ultrasonic flowmeter, the multichannel telemetry system, and the inductively-powered dual channel cardiac pacer were evaluated in a series of ten mongrel dogs (15 to 20 kg.). These systems were used to measure ascending aortic and coronary blood flow, aortic pressure, and subcutaneous EKG.

  7. Treatment of protruding osseo integrated dental implant

    Directory of Open Access Journals (Sweden)

    Buddula Aravind

    2010-01-01

    Full Text Available Titanium dental implants have been used in the treatment of partial or complete edentulism. The height and width of the residual alveolus and surrounding anatomical structures can determine the proper position and path of insertion of dental implants. The following case report describes the treatment of a malpositioned osseo integrated dental implant with an apex perforating the buccal cortex of alveolar bone. A 61-year-old male was referred by his local dentist for the chief complaint of a swelling at site of tooth 14 where an implant was present. Intraoral clinical examination revealed an implant supported porcelain fused to metal crown replacing the maxillary right first premolar. A peri-apical radiograph of the implant revealed no signs of peri-implant bone loss or radiolucency. Surgical exploration and modification of the protruding implant. The area healed uneventfully without the need of explantation of the implant in site of tooth 14. We felt that the conservative treatment provided was prudent and treatment of choice and anticipate that the implant will most likely continue to function for a lifetime.

  8. Simvastatin Reduces Capsular Fibrosis around Silicone Implants.

    Science.gov (United States)

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

    2016-08-01

    Capsular fibrosis and contracture occurs in most breast reconstruction patients who undergo radiotherapy, and there is no definitive solution for its prevention. Simvastatin was effective at reducing fibrosis in various models. Peri-implant capsular formation is the result of tissue fibrosis development in irradiated breasts. The purpose of this study was to examine the effect of simvastatin on peri-implant fibrosis in rats. Eighteen male Sprague-Dawley rats were allocated to an experimental group (9 rats, 18 implants) or a control group (9 rats, 18 implants). Two hemispherical silicone implants, 10 mm in diameter, were inserted in subpanniculus pockets in each rat. The next day, 10-Gy of radiation from a clinical accelerator was targeted at the implants. Simvastatin (15 mg/kg/day) was administered by oral gavage in the experimental group, while animals in the control group received water. At 12 weeks post-implantation, peri-implant capsules were harvested and examined histologically and by real-time polymerase chain reaction. The average capsular thickness was 371.2 μm in the simvastatin group and 491.2 μm in the control group. The fibrosis ratio was significantly different, with 32.33% in the simvastatin group and 58.44% in the control group (P silicone implants in rats. This finding offers an alternative therapeutic strategy for reducing capsular fibrosis and contracture after implant-based breast reconstruction. PMID:27478339

  9. Computerized implant-dentistry: Advances toward automation

    Directory of Open Access Journals (Sweden)

    Minkle Gulati

    2015-01-01

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

  10. Exposed Dental Implant? Local Autograft A Saviour!

    Science.gov (United States)

    Rai, Raj; Punde, Prashant A; Suryavanshi, Harshal; Shree, Swetha

    2015-01-01

    Implant exposure due to faulty placement, posses as the most common reason for implant failure. The implant placed too close to buccal or lingual cortex have lead to such failure on numerous occasions. Also, anatomic variations like the thin buccolingual width of alveolar ridge predispose exposure of the implant. 25-year-old female patient had undergone surgical placement of implants in mandibular anterior region 2 months back in the private dental clinic. The clinician noted Grade I mobility in one of the implants placed. The case was referred to the author. Thin overlying gingiva depicted an entire buccal aspect of the implant, which suggested more than 90 % loss of buccal cortex. According to literature and review of similar case reports, the only way suggested was to surgically remove the implant and wait for 12-24 months for the bone to heal for subsequent placement. Rather than the removal of implants as suggested, the author followed a naval approach of reinforcing buccal cortex using an autogenous cortical block from mandibular symphysis. The reinforcement surgery had certainly saved patients time, money and most importantly limits a crucial period of edentulism, which may be enforced on a patient in case the implant was removed. PMID:26668490

  11. Cortical Plasticity after Cochlear Implantation

    Directory of Open Access Journals (Sweden)

    B. Petersen

    2013-01-01

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

  12. Miniaturized neural interfaces and implants

    Science.gov (United States)

    Stieglitz, Thomas; Boretius, Tim; Ordonez, Juan; Hassler, Christina; Henle, Christian; Meier, Wolfgang; Plachta, Dennis T. T.; Schuettler, Martin

    2012-03-01

    Neural prostheses are technical systems that interface nerves to treat the symptoms of neurological diseases and to restore sensory of motor functions of the body. Success stories have been written with the cochlear implant to restore hearing, with spinal cord stimulators to treat chronic pain as well as urge incontinence, and with deep brain stimulators in patients suffering from Parkinson's disease. Highly complex neural implants for novel medical applications can be miniaturized either by means of precision mechanics technologies using known and established materials for electrodes, cables, and hermetic packages or by applying microsystems technologies. Examples for both approaches will be introduced and discussed. Electrode arrays for recording of electrocorticograms during presurgical epilepsy diagnosis have been manufactured using approved materials and a marking laser to achieve an integration density that is adequate in the context of brain machine interfaces, e.g. on the motor cortex. Microtechnologies have to be used for further miniaturization to develop polymer-based flexible and light weighted electrode arrays to interface the peripheral and central nervous system. Polyimide as substrate and insulation material will be discussed as well as several application examples for nerve interfaces like cuffs, filament like electrodes and large arrays for subdural implantation.

  13. Trasformaciones del empleo, flexibilidad y relaciones laborales en Europa Trasformaciones del empleo, flexibilidad y relaciones laborales en Europa

    Directory of Open Access Journals (Sweden)

    Carlos Prieto

    2009-05-01

    importantes de inseguridad y un deterioro progresivo de las garantías sociales mínimas. Esta tendencia se presenta con grandes diferencias entre los países de la Unión. Esas diferencias tienen que ver con un doble orden de factores: en primer lugar con la fortaleza o debilidad del sistema de relaciones laborales de cada país; y en segundo lugar con la incorporación al empleo de nuevos sujetos laborales distintos del varón adulto nacional, en particular jóvenes, mujeres e inmigrantes, grupos en general muy alejados de la influencia sindical y que, por sus peculiares características, han podido contribuir a que formas flexibilizadas de empleo se acaben consolidando como habituales.

  14. Tecnolog??as del cuidado del mundo

    OpenAIRE

    Higuera Esp??n, Javier de la

    2011-01-01

    Desde la ??ptica de la ontolog??a de la actualidad, este texto pretende pensar en la posibilidad de unas ???tecnolog??as del mundo??? que, en correlaci??n con las ???tecnolog??as del yo???, sean responsables del cuidado del acontecer singular que define nuestro presente, amenazado por fuertes tendencias homogeneizadoras capaces de cerrar o compactar el mundo. Por el contrario, el mundo s??lo es mundo si ???en ??l puede abrirse un afuera??? (J.-L. Nancy). Para ello analiza la naturaleza de es...

  15. El Banco del Sur

    OpenAIRE

    Espejo, Silvana

    2012-01-01

    En este trabajo abordaremos las características principales del Banco del Sur como una institución financiera sudamericana. Primero presentaremos sus principales características y explicaremos las características de un banco de desarrollo regional. Luego, expondremos el proceso de conformación del mismo haciendo un recorrido por sus principales antecedentes. Por último, cerraremos con una evaluación sobre el estado actual del Banco del Sur. (Párrafo extraído del texto a modo de resumen)...

  16. He reemission implanted in metals

    Energy Technology Data Exchange (ETDEWEB)

    Tanabe, T., E-mail: tanabe@nucl.kyushu-u.ac.jp

    2014-10-15

    Highlights: • Observation of He reemission of various metals under He{sup +} 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{sub m}) to the melting point of each metal. At elevated temperatures (well above ∼0.6 T{sub 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{sub m}, He reemission always accompanies significant structure modification. For ∼04–0.6 T{sub 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{sub 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

  17. Cochlear implantation and change in quality of life

    DEFF Research Database (Denmark)

    Faber, Christian; Grøntved, Ågot Møller

    2000-01-01

    The aim of this study was to assess the benefits of cochlear implantation (CI) in adults and to evaluate the average implant usage per day. Ten profoundly deaf adults were implanted during the period April 1994 to September 1997. The patients answered questionnaires 1 year or more after receiving...... their cochlear implants. All of the patients used their implant daily. The average implant usage per day was 16 h. The patients stated that, given the choice, they would again opt for a cochlear implant and would recommend a cochlear implant for a deaf friend. A paired comparison showed that the implants led...

  18. Early Loaded Single Implant Reinforced Mandibular Overdenture.

    Science.gov (United States)

    Nischal, K; Chowdhary, R

    2016-01-01

    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. PMID:27403350

  19. 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.

  20. Common Prosthetic Implant Complications in Fixed Restorations.

    Science.gov (United States)

    Link-Bindo, Elyce E; Soltys, James; Donatelli, David; Cavanaugh, Richard

    2016-07-01

    Many clinicians consider implants to be one of the most important innovations in dental care. Even so, over the past 40 years of implant dentistry, complications have been a constant struggle for restorative dentists, surgeons, and patients alike. Implant-related problems can be particularly challenging and frustrating, especially given that an implant is thought to be a "lifetime" solution expected to yield minimal difficulties. This, however, is not necessarily the case with prosthetic restorations. With innovations in implant technology continuing to rapidly advance, maintaining knowledge of all the latest developments can be challenging for clinicians. The purpose of this article is to provide a basic understanding of the treatment, management, and prevention of common prosthetic and technical implant complications seen in the office of a restorative dentist. PMID:27548395

  1. Resultados clínicos a cuatro años de los tratamientos con implantes dentales en pacientes parcial y totalmente desdentados

    Directory of Open Access Journals (Sweden)

    I. Grau León

    2015-12-01

    Full Text Available Introducción: El objetivo del presente estudio era mostrar los resultados del tratamiento con implantes dentales utilizados en diversas situaciones clínicas. Métodos: 232 pacientes con pérdidas dentales fueron tratados con 488 implantes Galimplant® sumergidos con conexión externa y superficie obtenida por arenado y grabado ácido. Los implantes fueron cargados después de un periodo de cicatrización de 3 meses. Resultados: 138 pacientes fueron intervenidos con la técnica quirúrgica básica. En 94 pacientes, se realizaron técnicas complejas como la expansión ósea (14,2%, elevación del seno maxilar (12,9%, regeneración ósea guiada (10,3% e injertos óseos (3,1%. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 93,5%. 31 implantes se perdieron durante el periodo de cicatrización y un implante se perdió por periimplantitis. Un total de 256 prótesis fueron realizadas. El 54,5% de las prótesis realizadas fueron coronas unitarias; el 31,2% puentes fijos y el 15,2% sobredentaduras. El periodo medio de seguimiento clínico ha sido de 54,4 meses. Conclusiones: Este estudio indica que los implantes dentales pueden ser utilizados con éxito en el tratamiento de los pacientes con edentulismo parcial o total.

  2. Oseointegración en implantes Bicon® cargados a los tres meses después de haber sido colocados mediante la técnica de elevación interna del seno maxilar en pacientes atendidos en la facultad de odontología de la universidad de Cartagena

    OpenAIRE

    Lorena Meñaca; Katherine Palacios; Liliana Reina; Noeridys Torres; Luisa Arevalo; Guido Benedetti; Mauro Marincola

    2013-01-01

    ResumenObjetivo: El objetivo general de este estudio fue evaluar la oseointegración en implantes tipo Bicon® cargados a los tres meses de colocados, mediante la técnica de elevación interna de seno maxilar. Materiales y Métodos: Este estudio se establece como una investigación de tipo descriptivo, basado en una serie de casos clínicos tratados. En la recolección de la información se utilizó un instrumento en donde se registraron los datos personales de los pacientes, se realizó la toma de rad...

  3. Metodología para la manufactura de implantes craneales a partir de imágenes DICOM y tecnologías CAD/CAM/CNC Metodología para la manufactura de implantes craneales a partir de imágenes DICOM y tecnologías CAD/CAM/CNC

    Directory of Open Access Journals (Sweden)

    Iván López

    2005-12-01

    Full Text Available El presente artículo propone una metodología para el diseño y la fabricación de implantes craneales a partir de imágenes DICOM y tecnologías CAD/CAM/CNC. Esta metodología parte de las Tomografías Axiales Computarizadas (TAC de la cabeza del paciente, con las cuales se lleva a cabo la reconstrucción tridimensional del cráneo. Luego, en el sistema CAD se reconstruye el implante variando la técnica empleada dependiendo de la región del cráneo con defecto o trauma. Una vez obtenido el modelo, se diseña el montaje y se fabrica el implante con soporte en tecnología CAM/CNC.It’s proposed a methodology in order to design and manufacture cranial implants using DICOM and CAD/CAM/CNC technologies. This methodology begins when the designer makes a three-dimensional cranial reconstruction using the Axial Computer Tomographies (ACT of the patient’s cranium. Next, using a CAD system, the designer rebuilds the implant varying the used technique depending on the affected region. Finally, the designer builds the assembling and manufactures the implant.

  4. Immunohistochemical studies at the bone-implant interface of collagen-coated titanium pins

    Directory of Open Access Journals (Sweden)

    Stefan Rammelt

    2006-01-01

    Full Text Available Se realizaron estudios morfológicos e inmuno histoquímicos de secciones no descalcificadas de la interfaz entre implantes de titanio recubiertos con colágeno y el hueso adyacente, embebidas en un novedoso medio de inclusi ón. Se empleó colágeno tipo I liofilizado proveniente de cuero bovino para la fibrilogénesis a 37 oC durante 4 h, se centrifugó dos veces y se adsorbió durante 15 min sobre las varillas de titanio. Se implantaron pines de titanio de 0,8 mm de diámetro en las tibias de ratas Wistar macho adultas como varillas intramedulares. Como control se usaron pines de titanio sin recubrimiento de colágeno. Se sacrificaron seis animales por grupo al cabo de 1, 2, 4, 7, 14 y 28 d de la cirugía de implantación. Después de fijar inmediatamente en paraformaldeh ído 1,6 %, estabilizar con disolución reguladora de fosfato y deshidrataci ón con etanol y xilol, los especímenes se incluyeron en resina de base metacrilato Technovit 9100N de polimerización en frío. Los bloques con los especímenes se cortaron longitudinalmente a lo largo del eje del implante con equipo de corte y pulido Exact. Los implantes se extrajeron y se hicieron cortes seriados perpendiculares de 2 mm de sección y se montaron en portaobjetos de vidrio silanizado para el análisis inmuno histoquímico. Los anticuerpos primarios se detectaron con anticuerpos secundarios tratados con biotina, y a continuaci ón con el complejo estreptavidina-biotina-peroxidasa. A lo largo del período de observación, la tinción inmuno histoquímica fue consistente dentro de los grupos de estudio y reproducible en diferentes secciones del mismo espécimen. En el primer día después de la implantación, se observó reacción inflamatoria inespecífica manifestada por la presencia de granulocitos y linfocitos. En el segundo día, se observó un gran número de células fibroblásticas con reacción positiva a la vimentina y un pequeño número de ED1 y células fagocitantes

  5. Clinical management of implant prostheses in patients with bruxism

    NARCIS (Netherlands)

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

    2012-01-01

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

  6. Importancia de los índices periodontales en la evaluación de los implantes osteointegrados

    Directory of Open Access Journals (Sweden)

    C Zorrilla Romera

    2002-07-01

    Full Text Available El objetivo del estudio es conocer la relación existente entre la tasa de fracaso de una muestra de implantes recubiertos de hidroxiapatita (H.A. y los parámetros periodontales del paciente; así como el grado de asociación entre estos últimos. La muestra está formada por 52 pacientes, a los que hemos colocado 158 implantes recubiertos de H.A. (Integral® de Calcitek, que han sido revisados a los tres años de su colocación. El fracaso de los implantes se ha establecido según los criterios de SCHNITMAN Y SHULMAM de 1979. El estudio realizado es observacional analítico retrospectivo de seguimiento, a través del cual se evalúa la evolución clínica y radiológica de los implantes; resultando que la recesión periimplante medida en vestibular, lingual, mesial y distal de cada fijación es el único parámetro periodontal asociado al fracaso del implante (P= 0.008.La reabsorción ósea y la recesión periimplante se asocian de forma significativa (P The aim of this study was to determine, firstly,the relation between the failure of a sample of hydroxyapatite-coated implants (HA and the periodontal parameters of the patient, and secondly, the degree of association between such parameters. The sample was comprised of 52 patients and 158 H.A. coated implants (Integral® by Calcitek, which were revised three years after their insertion. Implant failure was determined according to the criteria of Schnitman and Shulman (1979. A retrospective analytical observational follow-up study was carried out, by means of which the clinical and radiological evolution of the implants was determined. It was found that the peri-implant recession measured facial, lingual, mesial and distal from each implant is the only periodontal parameter associated with the failure of the implant (p=0.008. Bone resorption and periimplant recession were significantly associated (p<0.05,as was probe depth with the gingivitis index in all positions and with the plaque index in

  7. La rehabilitación con implantes en el paciente edéntulo maxilar mediante cirugía guiada y carga inmediata

    Directory of Open Access Journals (Sweden)

    J.M. Lorrio Castro

    2015-12-01

    Full Text Available Introducción: La cirugía guiada y la carga inmediata de los implantes constituye un nuevo enfoque integral de la rehabilitación de los pacientes edéntulos. El objetivo del presente trabajo era presentar el protocolo diagnóstico, quirúrgico y protésico del tratamiento con implantes mediante la técnica de cirugía guiada y carga inmediata en el tratamiento del maxilar edéntulo. Caso clínico: Paciente varón de 70 años que acude a consulta para tratamiento con implantes del maxilar edéntulo. La tomografía computarizada de haz cónico (TCHC muestra que el paciente presenta un adecuado volumen óseo para la inserción de implantes. La información obtenida por la TCHC es utilizada para la evaluación y el plan de tratamiento. Se planificaron diez implantes. Los datos digitales de imagen tomográfica fueron enviados a un centro especializado (Galimplant 3.D® para la realización de la férula quirúrgica y la prótesis provisional. De acuerdo a la férula guiada se insertaron los implantes sin colgajo con un fresado preciso. La prótesis fija inmediata provisional fue realizada y ajustada sobre los pilares, evaluando su oclusión. La prótesis fija definitiva se realizó después de un periodo de 6 meses. Conclusiones: Este caso clínico indica que la implantología oral guiada puede constituir una terapéutica exitosa en el tratamiento del paciente edéntulo maxilar.

  8. Improving electric contacts by ion implantation

    Energy Technology Data Exchange (ETDEWEB)

    Xu Shiru; Zhang Ying; Zheng Tiampi

    1989-01-01

    This article studies the improvement of electric contacts by ion implantation. 1 x 10/sup 17/ cm/sup -2/ of N/sup +/ and N/sub 2//sup +/ was implanted into two kinds of electric contacts, then a make-and-break test was made with the low voltage electrical apparatus. The weight loss of the contacts, temperature rise, contact resistance and transfer of material between the two contacts were measured. The contacts implanted by ions have improved electrical erosion properties.

  9. Treatment of protruding osseo integrated dental implant

    OpenAIRE

    Buddula Aravind; Sheridan Phillip; Balshe Ayman

    2010-01-01

    Titanium dental implants have been used in the treatment of partial or complete edentulism. The height and width of the residual alveolus and surrounding anatomical structures can determine the proper position and path of insertion of dental implants. The following case report describes the treatment of a malpositioned osseo integrated dental implant with an apex perforating the buccal cortex of alveolar bone. A 61-year-old male was referred by his local dentist for the chief complaint of a s...

  10. Antimicrobial technology in orthopedic and spinal implants

    Science.gov (United States)

    Eltorai, Adam EM; Haglin, Jack; Perera, Sudheesha; Brea, Bielinsky A; Ruttiman, Roy; Garcia, Dioscaris R; Born, Christopher T; Daniels, Alan H

    2016-01-01

    Infections can hinder orthopedic implant function and retention. Current implant-based antimicrobial strategies largely utilize coating-based approaches in order to reduce biofilm formation and bacterial adhesion. Several emerging antimicrobial technologies that integrate a multidisciplinary combination of drug delivery systems, material science, immunology, and polymer chemistry are in development and early clinical use. This review outlines orthopedic implant antimicrobial technology, its current applications and supporting evidence, and clinically promising future directions. PMID:27335811

  11. ndophthalmitis Following Glaucoma Drainage Implant Surgery

    OpenAIRE

    Tolga Kocatürk; Erol Erkan; Harun Çakmak

    2014-01-01

    Glaucoma surgery is performed widely in our country and all around the world to lower the intraocular pressure in refractory glaucoma. Glaucoma drainage implant surgery has a special and important place among glaucoma surgeries. Among various complications, endophthalmitis is a rare but the most devastating complication after glaucoma drainage implantation. In this review, the clinical characteristics and treatment options of endophthalmitis after glaucoma drainage implant surgery ar...

  12. ndophthalmitis Following Glaucoma Drainage Implant Surgery

    Directory of Open Access Journals (Sweden)

    Tolga Kocatürk

    2014-03-01

    Full Text Available Glaucoma surgery is performed widely in our country and all around the world to lower the intraocular pressure in refractory glaucoma. Glaucoma drainage implant surgery has a special and important place among glaucoma surgeries. Among various complications, endophthalmitis is a rare but the most devastating complication after glaucoma drainage implantation. In this review, the clinical characteristics and treatment options of endophthalmitis after glaucoma drainage implant surgery are discussed according to recent literature. (Turk J Ophthalmol 2014; 44: 138-43

  13. Immunopathologic effects of silicone breast implants.

    OpenAIRE

    S.S. Teuber; Yoshida, S H; Gershwin, M E

    1995-01-01

    Silicone-gel breast implants have been associated with a myriad of autoimmune and connective tissue disorders by anecdotal reports and small observational series. To date, no prospective epidemiologic studies have been done to substantiate these observations, but an increasing body of literature is being developed and older studies are being recognized that point to immunotoxic or inflammatory effects of these breast implant components. The development of disease due to implants would depend ...

  14. Early History and Challenges of Implantable Electronics

    OpenAIRE

    Ko, Wen H.

    2012-01-01

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

  15. Extraocular Surgical Approach for Placement of Subretinal Implants in Blind Patients: Lessons from Cochlear-Implants

    OpenAIRE

    Assen Koitschev; Katarina Stingl; Karl Ulrich Bartz-Schmidt; Angelika Braun; Florian Gekeler; Udo Greppmaier; Helmut Sachs; Tobias Peters; Barbara Wilhelm; Eberhart Zrenner; Dorothea Besch

    2015-01-01

    In hereditary retinal diseases photoreceptors progressively degenerate, often causing blindness without therapy being available. Newly developed subretinal implants can substitute functions of photoreceptors. Retina implant extraocular surgical technique relies strongly on cochlear-implant know-how. However, a completely new surgical approach providing safe handling of the photosensor array had to be developed. The Retina Implant Alpha IMS consisting of a subretinal microphotodiode array and ...

  16. Effectiveness of Implant Therapy Analyzed in a Swedish Population: Early and Late Implant Loss

    OpenAIRE

    Derks, J.; Håkansson, J.; Wennström, J.L.; Tomasi, C.; Larsson, M.; Berglundh, T

    2015-01-01

    Treatment outcomes in implant dentistry have been mainly assessed as implant survival rates in small, selected patient groups of specialist or university clinical settings. This study reports on loss of dental implants assessed in a large and randomly selected patient sample. The results were aimed at representing evaluation of effectiveness of implant dentistry. Using the national data register of the Swedish Social Insurance Agency, 4,716 patients were randomly selected. All had been provid...

  17. Injury to the coronary arteries and related structures by implantation of cardiac implantable electronic devices.

    Science.gov (United States)

    Pang, Benjamin J; Barold, S Serge; Mond, Harry G

    2015-04-01

    Damage to the coronary arteries and related structures from pacemaker and implantable cardioverter-defibrillator lead implantation is a rarely reported complication that can lead to myocardial infarction and pericardial tamponade that may occur acutely or even years later. We summarize the reported cases of injury to coronary arteries and related structures and review the causes of troponin elevation in the setting of cardiac implantable electronic device implantation. PMID:25564549

  18. Peri-implantitis: from diagnosis to therapeutics.

    Science.gov (United States)

    Nguyen-Hieu, Tung; Borghetti, Alain; Aboudharam, Gérard

    2012-05-01

    Peri-implantitis is an infection of the tissue around an implant, resulting in the loss of supporting bone. Risk factors for peri-implantitis consist of a history of periodontitis, dental plaque, poor oral hygiene, smoking, alcohol consumption and diabetes. A clinical diagnosis indicates inflammatory signs including bleeding on probing with or without suppuration and a peri-implant pocket depth ≥5 mm. A radiograph shows images of marginal bone loss ≥2 mm. A differential diagnosis of peri-implant mucositis, occlusal overload, retrograde peri-implantitis and inflammatory implant periapical lesions suggests the appropriate treatment in each case. The non-surgical treatment of peri-implantitis, including a mechanical treatment alone or combined with antiseptics or antibiotics can improve clinical parameters in the short term but residual defects may still persist. Surgical treatment such as guided bone regeneration results in a gain of clinical attachment level and bone reconstruction in the long term. The limited effect of laser-assisted therapy needs to be further evaluated. The concept of prevention based on early detection and regular maintenance plays a principal role in reducing the occurrence of peri-implantitis. PMID:22383175

  19. Periodontio-integrated implants: A revolutionary concept

    Directory of Open Access Journals (Sweden)

    Minkle Gulati

    2014-01-01

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

  20. Basic concepts and techniques of dental implants.

    Science.gov (United States)

    Tagliareni, Jonathan M; Clarkson, Earl

    2015-04-01

    Dental implants provide completely edentulous and partial edentulous patients the function and esthetics they had with natural dentition. It is critical to understand and apply predictable surgical principles when treatment planning and surgically restoring edentulous spaces with implants. This article defines basic implant concepts that should be meticulously followed for predictable results when treating patients and restoring dental implants. Topics include biological and functional considerations, biomechanical considerations, preoperative assessments, medical history and risk assessments, oral examinations, radiographic examinations, contraindications, and general treatment planning options. PMID:25835792

  1. High energy ion implantation for IC processing

    International Nuclear Information System (INIS)

    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 1013/cm2 have been investigated as a function of anneal temperature by sheet resistance, Hall and noise measurements. (Auth.)

  2. The case for a generic implant processor.

    Science.gov (United States)

    Strydis, Christos; Gaydadjiev, Georgi N

    2008-01-01

    A more structured and streamlined design of implants is nowadays possible. In this paper we focus on implant processors located in the heart of implantable systems. We present a real and representative biomedical-application scenario where such a new processor can be employed. Based on a suitably selected processor simulator, various operational aspects of the application are being monitored. Findings on performance, cache behavior, branch prediction, power consumption, energy expenditure and instruction mixes are presented and analyzed. The suitability of such an implant processor and directions for future work are given.

  3. Comportamiento metalúrgico de mini implantes de Ti-6Al-4V como anclaje temporal en aplicaciones de ortodoncia

    OpenAIRE

    Ivan Mendoza-Bravo; José Antonio Arias-González; Doris Ivette Villalobos-Vera; Héctor Ruiz-Reyes

    2014-01-01

    El uso de mini implantes como sistema de anclaje temporal en ortodoncia, es una técnica relativamente nueva que permite el movimiento de los dientes de una manera eficiente y predecible. A pesar de que se han empezado a utilizar en diversos países como Alemania, Japón y Corea del Sur, aún existe la necesidad de analizar y dar a conocer las ventajas de este procedimiento sobre los tratamientos tradicionales. En este trabajo se analizó la integridad de mini implantes fabricados de una aleación ...

  4. Accesibilidad del sitio web del CONAPRED

    OpenAIRE

    Luján Mora, Sergio

    2012-01-01

    Accesibilidad del sitio web del CONAPRED (Consejo Nacional para Prevenir la Discriminación) de México. Más información: - http://accesibilidadweb.dlsi.ua.es - http://desarrolloweb.dlsi.ua.es Autor: Sergio Luján Mora, profesor de la Universidad de Alicante (http://www.ua.es).

  5. The implant surface characteristics and peri-implantitis. An evidence-based update.

    Science.gov (United States)

    Peixoto, C Davila; Almas, K

    2016-03-01

    Peri-implantitis is an inflammatory disease of the peri-implant mucosa with the loss of supporting bone. Because of the absence of an un-inflamed connective tissue zone between the healthy and diseased sites, peri-implant lesions are thought to progress more rapidly than periodontal lesions, suggesting the importance of early diagnosis and intervention if possible. A number of risk factors have been identified that may lead to the initiation and progression of peri-implant mucositis and peri-implantitis, eg., previous periodontal disease, poor plaque control, inability to clean, residual cement, smoking, genetic factors, diabetes, occlusal overload, rheumatoid arthritis, increased time of loading and alcohol consumption. At present there is not much literature available, highlighting the relationship between implant surface characteristics and peri-implant diseases. Implant surface characteristics vary with respect to topography, roughness and clinical composition, including turned, blasted, acid etched, porous sintered, oxidized, plasma sprayed and hydroxyapatite coated surfaces and their combinations. So the aim of this review is to explore the relationship between the characteristics of implant surface, the prevalence and incidence of peri-implantitis. This would help to identify plausible influence of surface characteristics, oral hygiene instructions and maintenance of implants for the long-term uneventful success of implant therapy. PMID:27434917

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

    Directory of Open Access Journals (Sweden)

    Eda OZYILMAZ

    2015-01-01

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

  7. Borja Gómez, Jaime y Rodríguez Jiménez, Pablo. Historia de la vida privada en Colombia. Tomo I: Las fronteras difusas del siglo XVI a 1880. Bogotá: Taurus, 2011, 396 págs.

    Directory of Open Access Journals (Sweden)

    Didier Francisco Ríos García

    2012-07-01

    Full Text Available Desde mediados de los ochenta cuando Philippe Ariès y George Duby, sacaron a la luz un trabajo sobre la vida privada, se ha generado un nuevo movimiento historiográfico que ha recorrido el mundo, el cual no trata lo que siempre la historia había trabajado, sino que se concentraba en la vida de las vidas secretas de las personas, ya fueran personajes públicos o desconocidas, también se hablo de las situaciones que vivían los sectores marginales de la población, todos visto desde el punto de vista de su vida en los ambientes alejados del escrutinio público, desde su forma de vestir, sus amores, sus aventuras, su alimentación y de las mismos espacios que frecuentaban.

  8. [Postoperative complications of cochlear implant: eight years of experience].

    Science.gov (United States)

    Yépez-Pabón, Daniela; Guevara-Sánchez, Marco

    2015-01-01

    Introducción: el implante coclear es una cirugía con poca morbimortalidad. Las complicaciones posquirúrgicas pueden ser menores y mayores. Las menores requieren manejo conservador; las mayores, reintervención o retiro del implante. El objetivo de este trabajo es determinar nuestras complicaciones y cotejarlas con series internacionales y latinoamericanas. Métodos: se analizan retrospectivamente 275 casos intervenidos entre diciembre 2005 y diciembre 2013. Se incluyen niños y adultos entre 11 meses hasta 82 años de edad. Se evalúan datos demográficos, colocación uni o bilateral, tipo de cirugía y las complicaciones posquirúrgicas. El seguimiento fue por 20 meses. Resultados: el 57.46 % son niños y adolescentes; el 33.81 % jóvenes y adultos, y el 8.73 % adultos mayores. El índice de complicaciones es del 12 % (n = 33), 6.91 % en mujeres y 5.09 % en hombres. Entre los 19 a 60 años hay más complicaciones. Las complicaciones menores representan el 7.64 %: infección local (n = 9), parálisis facial transitoria tardía (n = 7), vértigo (n = 3) y tinnitus (n = 2). Prevalecen en niños y adultos. Las complicaciones mayores son el 4.36 %: hematomas postquirúrgicos (n = 8), extrusiones (n = 2) e inadecuada colocación de electrodos (n = 2). Predominan en los adultos entre 19 a 60 años. No se presentan casos de meningitis ni decesos. Conclusiones: la implantación coclear tiene baja incidencia de complicaciones. Nuestros resultados, los únicos reportados a nivel nacional, son similares a los que menciona la literatura.

  9. El tratamiento con implantes dentales en los pacientes adultos mayores

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2015-06-01

    Full Text Available En las últimas décadas, la implantología oral ha representado una técnica creciente en gerodontología. En este sentido, la edad avanzada no es una contraindicación para la implantología oral. Desde un punto de vista integral, es necesario la valoración de las condiciones médicas del paciente mayor, un diagnóstico oral, y una correcta planificación de tratamiento, con un estricto protocolo quirúrgico y prostodóncico. Muchos pacientes candidatos para la cirugía de implantes son mayores, y su perfil médico puede ser complejo. La comunicación con su médico puede ser importante para minimizar los riesgos quirúrgicos. Después de la fase quirúrgica, el éxito a largo plazo de los implantes dentales exige una buena reacción de los tejidos blandos y duros periimplantarios. Prótesis fijas y removibles pueden estar indicadas en los pacientes mayores edéntulos, según diferentes protocolos de carga funcional. El mantenimiento por el paciente y las revisiones periódicas por el dentista son muy importantes. Las prótesis implantosoportadas mejoran la calidad de vida oral y el bienestar psicosocial de los pacientes ancianos edéntulos.

  10. Los efectos de la "americanización" de las campañas electorales del mundo

    OpenAIRE

    Rodríguez-Andrés, R. (Roberto)

    2012-01-01

    Estados Unidos ejerce un papel de “laboratorio social” en el que se ensayan tendencias culturales, sociales y políticas que acaban implantándose con el tiempo en el resto del mundo. Este proceso de “americanización” se ha acelerado desde la caída del Muro de Berlín y el desmoronamiento del comunismo, que ha reforzado el protagonismo de Estados Unidos como primera potencia del mundo y también como espejo en el que, voluntaria o involuntariamente, se acaban reflejando otros muchos países, inclu...

  11. Geologia del Baix Ter

    OpenAIRE

    Mas-Pla, Josep

    1986-01-01

    Article que analitza el valor i la singularitat de les zones humides del Baix Ter, tenint en compte la descripció de les característiques geològiques de la Plana del Ter i dels diferents ambients morfodinàmics que s' hi troben

  12. El tratamiento con implantes en pacientes edéntulos totales mandibulares mediante rehabilitación fija Etiologic role of virus in periodontal diseases

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2007-12-01

    Full Text Available Introducción. El objetivo del presente estudio era mostrar los resultados del tratamiento con rehabilitación fija mediante implantes dentales en pacientes edéntulos totales mandibulares. Métodos. 29 pacientes fueron tratados con 190 implantes Microdent ® con superficie con chorreado de arena para la rehabilitación fija mandibular. Los implantes fueron cargados después de un periodo de cicatrización de 3 meses. El seguimiento clínico fue al menos de 12 meses. Resultados. Los hallazgos clínicos indican una supervivencia y éxito de los implantes del 97,9%. 4 implantes se perdieron durante el periodo de cicatrización. El 58,6% de las prótesis realizadas fueron atornilladas y el 41,4% fueron cementadas. Después de un periodo medio de carga funcional de 41,4 meses, no ha habido complicaciones tardías. Conclusiones. Este estudio indica que el tratamiento con rehabilitación fija mediante implantes dentales en pacientes edéntulos mandibulares constituye una terapéutica con éxito.Introduction. The aim of this study was to report the outcome of treatment of completely edentulous mandible patients with fixed prostheses supported with dental implants. Methods. 29 patients were treated with 190 Microdent ® sandblasted surface implants for fixed mandible rehabilitation. Implants were loaded after a healing free-loading period of 3 months. The follow-up were at least 12 months. Results. Clinical results indicate a survival and success rate of implants of 97,9%. 4 implants were lost during the healing period. 58,6% of patients were restored with screw fixed cemented and 41,4% with fixed prostheses. After a mean functioning period of 41,4 months, no late complications were reported. Conclusions. This study indicate that treatment with fixed protheses by dental implants in completely edentulous mandible patients constitute a successful treatment.

  13. Fracture dynamics in implanted silicon

    Science.gov (United States)

    Massy, D.; Mazen, F.; Tardif, S.; Penot, J. D.; Ragani, J.; Madeira, F.; Landru, D.; Kononchuk, O.; Rieutord, F.

    2015-08-01

    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.

  14. Implantation und Komplikation der Vagusnervstimulation

    Directory of Open Access Journals (Sweden)

    Spuck S

    2007-01-01

    Full Text Available Weltweit wurden bis zum Beginn des Jahres 2007 45.000 Vagusnervstimulatoren (VNS implantiert. Trotz der häufigen Operationen sind nur wenige Berichte über Komplikationen veröffentlicht. Die primäre operative Implantation ist ein sicheres Verfahren. Komplikationen und Nebenwirkungen können nach operations-, material- und stimulationsassoziiertem Ursprung unterteilt werden. Erforderliche Revisionseingriffe sind insbesondere bei Kindern anspruchsvoll. Im folgenden Artikel werden mögliche Probleme der VNS-Therapie und deren Behandlung dargestellt.

  15. Los implantes de titanio con superficie grabada con ácidos: Un seguimiento clínico a 2 años Titanium implants with acid etched surface: A 2-year clinical follow-up

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2004-12-01

    Full Text Available Introducción. La tecnologia implantológica está mejorando la experiencia clínica de los implantes oseointegrados, con nuevos diseños y composición en su superficie. El estudio muestra la evaluación de los implantes oseointegrados de titanio con superficie grabada con ácidos y carga precoz en pacientes con pérdida dental unitaria, parcial y total. Métodos. 35 pacientes fueron tratados con 100 implantes TSA Defcon®, 53 en la mandibula y 47 en el maxilar superior. Todos los implantes fueron insertados en 1 fase quirúrgica. Los implantes fueron cargados funcionalmente tras un periodo de tiempo de 6 semanas (mandibula y de 8 semanas (maxilar superior. Los hallazgos clínicos (implantológicos y prostodóncicos se han seguido durante 2 años. Resultados. Tras la cicatrización (6-8 semanas, 19pacientes fueron restaurados con coronas unitarias (54,3%,9 pacientes con sobre dentaduras (25,7% y 7 pacientes con puentes fijos (20%, respectivamente. Se observaron complicaciones precoces, durante el periodo de cicatrización libre de carga funcional, en 3 implantes que fueron extraidos por movilidad. Estos resultados indican una supervivencia y éxito de los implantes, de 97%. Conclusiones. Los hallazgos clínicos del presente estudio sugieren que la utilización de los implantes de titanio con superficie grabada al ácido pueden obtener la oseointegración y ser cargados precozmente, representando un procedimiento técnico con éxito en los pacientes con pérdida de dientes.Introduction. Implant technology is improving the clinical experience of osseointegrated implants with new designs and compositions of their surfaceso This study reports the results of evaluation of titanium implants with acid-etched surface and early loading in patients with unitary, partially and fully tooth loss. Methods. 100 TSA Defcon® implants were inserted in 36 patients. 63 implants were placed in the mandible and 47 in the maxilla. All implants were inserted in one

  16. A Review of Dental Implant Treatment Planning and Implant Design Based on Bone Density

    Directory of Open Access Journals (Sweden)

    Torkzaban

    2013-06-01

    Full Text Available Context A key determinant for clinical success is the diagnosis of the bone density in a potential implant site. The percentage of bone-implant contact is related to bone density, and the axial stress contours around an implant are affected by the density of bone. Evidence Acquisition A number of reports have emphasized the importance of the quality of bone on the survival of dental implants. The volume and density of the recipient bone have also been shown to be determining criteria to establish proper treatment plans with adequate number of implants and sufficient surface area. Previous clinical reports that did not alter the protocol of treatment related to bone density had variable survival rates. To the contrary, altering the treatment plan to compensate for soft bone types has provided similar survival rates in all bone densities. Results When bone density decreases and bone become softer, the implant surface in contact with the bone decreases, therefore treatment plan should be modified by changing the drilling protocol, using gradual loading and reducing the force on the prosthesis or increasing the loading area with increasing implant number, implant position, implant size, implant design (deeper and more threads with more pitch, squared shape and implant body surface condition. Conclusions Once the prosthetic option, key implant position, and patient force factors have been determined, the bone density in the implant sites should be evaluated to modify the treatment plan. Inappropriate implant number or design in poor quality bone results in higher failure rates. Changing the treatment plan and implant design is suggested, based on bone density to achieve higher survival rates.

  17. Del territorio del sujeto al emplazamiento del Común

    Directory of Open Access Journals (Sweden)

    Mariano Adrían Ferretti

    2016-01-01

    Full Text Available La construcción de lo público abarca una variedad de dinámicas que condicionan el resultado físico de los espacios donde actúan los individuos en sus necesidades de habitar, modificando su realidad desde la diferenciación y la singularización subjetiva del entorno que derivan en nuevas formas de territorialidad de lo público a partir de la dialéctica entre lo público y lo privado. Sin embargo, los resultados de tales representaciones entendidas como acciones colectivas –y por tanto comunes- no siempre explican los valores que desde lo simbólico partiendo del sujeto constituyan un estatus diferente de lo público en los procesos de territorialización. Se propone una aproximación que aborde de manera teórica cuestiones tales como: los vínculos del individuo con los procesos de acumulación material y transformación del territorio y las implicaciones que dichos fenómenos tienen en la posibilidad de constitución de un sujeto que trascendiendo al individuo sea capaz de conformar un nuevo estatus del sujeto o, dicho de otro modo, un emplazamiento del Común.

  18. De la pervivencia (o no de algunas innovaciones morfosintácticas del judeoespañol castizo About the survival (or not of some morphosyntactical innovations in the castizo Judeo-Spanish

    Directory of Open Access Journals (Sweden)

    Aitor GARCÍA MORENO

    2013-03-01

    Full Text Available Textos como los del llamado Me‘am lo‘e? clásico, aparecidos en Constantinopla en el siglo XVIII (Génesis 1730, Éxodo 1733-1746, Levítico 1753, Números 1764 y Deuteronomio 1773-1777, exhiben ya una madura prosa judeoespañola que, aunque bebe en el hebreo de las fuentes literarias que maneja, muestra procesos propios de raíz hispánica en la evolución morfosintáctica, que prueban el alejamiento de la variedad sefardí respecto del español estándar del momento. En este trabajo analizaremos hasta qué punto dichas transformaciones, a veces solo apuntadas en la literatura sefardí del s. XVIII, el «Siglo del Oro» del judeoespañol, han triunfado o no en el judeoespañol de los siglos XIX y XX, con especial atención a los géneros literarios de adopción moderna (novela, prensa, etc. alejados de la tradición de la prosa rabínica.Texts like the so-called classical Me‘am lo‘e?, published in Constantinople in the 18th century (Genesis 1720, Exodus 1733-1746, Leviticus 1753, Numbers 1764 and Deutoronomy 1773-1777, already exhibit a mature Judeo-Spanish prose which, though influenced by Hebrew literary sources, shows processes of morphosyntactical evolution of its own which are rooted in Spanish and at the same time are proof of the drift away from the standard Spanish of the time that the Sephardic variety underwent . In this work we analyse how such transformations, sometimes only just starting in the Sephardic literature of the 18th century, the «Golden Age» of Judeo-Spanish, have developed or not in the Judeo-Spanish of the 19th and 20th centuries, paying special attention to those literary genres of modern adoption (novel, press, etc., which have grown apart from the rabbinical prose tradition.

  19. Bioactivity of plasma implanted biomaterials

    Science.gov (United States)

    Chu, Paul K.

    2006-01-01

    Plasma immersion ion implantation and deposition (PIII&D) is an effective technique to enhance the surface bioactivity of materials. In this paper, recent progress made in our laboratory on plasma surface modification of biomedical materials is described. NiTi alloys have unique super-elastic and shape memory properties and are suitable for orthopedic implants but the leaching of toxic Ni may pose health hazards in humans. We have recently investigated the use of acetylene, oxygen and nitrogen PIII&D to prevent out-diffusion of nickel and good results have been obtained. Silicon is the most important material in the microelectronics industry but its surface biocompatibility has not been investigated in details. We have recently performed hydrogen PIII into silicon to improve the surface bioactivity and observed biomimetic growth of apatite on the surface in simulated body fluids. Diamond-like carbon (DLC) is widely used in the industry due to its excellent mechanical properties and chemical inertness and by incorporation of elements such as nitrogen and phosphorus, the surface blood compatibility can be improved. The properties as well as in vitro biological test results are discussed in this article.

  20. Understanding music with cochlear implants

    Science.gov (United States)

    Bruns, Lisa; Mürbe, Dirk; Hahne, Anja

    2016-01-01

    Direct stimulation of the auditory nerve via a Cochlear Implant (CI) enables profoundly hearing-impaired people to perceive sounds. Many CI users find language comprehension satisfactory, but music perception is generally considered difficult. However, music contains different dimensions which might be accessible in different ways. We aimed to highlight three main dimensions of music processing in CI users which rely on different processing mechanisms: (1) musical discrimination abilities, (2) access to meaning in music, and (3) subjective music appreciation. All three dimensions were investigated in two CI user groups (post- and prelingually deafened CI users, all implanted as adults) and a matched normal hearing control group. The meaning of music was studied by using event-related potentials (with the N400 component as marker) during a music-word priming task while music appreciation was gathered by a questionnaire. The results reveal a double dissociation between the three dimensions of music processing. Despite impaired discrimination abilities of both CI user groups compared to the control group, appreciation was reduced only in postlingual CI users. While musical meaning processing was restorable in postlingual CI users, as shown by a N400 effect, data of prelingual CI users lack the N400 effect and indicate previous dysfunctional concept building. PMID:27558546

  1. Understanding music with cochlear implants.

    Science.gov (United States)

    Bruns, Lisa; Mürbe, Dirk; Hahne, Anja

    2016-01-01

    Direct stimulation of the auditory nerve via a Cochlear Implant (CI) enables profoundly hearing-impaired people to perceive sounds. Many CI users find language comprehension satisfactory, but music perception is generally considered difficult. However, music contains different dimensions which might be accessible in different ways. We aimed to highlight three main dimensions of music processing in CI users which rely on different processing mechanisms: (1) musical discrimination abilities, (2) access to meaning in music, and (3) subjective music appreciation. All three dimensions were investigated in two CI user groups (post- and prelingually deafened CI users, all implanted as adults) and a matched normal hearing control group. The meaning of music was studied by using event-related potentials (with the N400 component as marker) during a music-word priming task while music appreciation was gathered by a questionnaire. The results reveal a double dissociation between the three dimensions of music processing. Despite impaired discrimination abilities of both CI user groups compared to the control group, appreciation was reduced only in postlingual CI users. While musical meaning processing was restorable in postlingual CI users, as shown by a N400 effect, data of prelingual CI users lack the N400 effect and indicate previous dysfunctional concept building. PMID:27558546

  2. Comparison of peri-implant bone formation around injection-molded and machined surface zirconia implants in rabbit tibiae.

    Science.gov (United States)

    Kim, Hong-Kyun; Woo, Kyung Mi; Shon, Won-Jun; Ahn, Jin-Soo; Cha, Seunghee; Park, Young-Seok

    2015-01-01

    The aim of this study was to compare osseointegration and surface characteristics of zirconia implants made by the powder injection molding (PIM) technique against those made by the conventional milling procedure in rabbit tibiae. Surface characteristics of 2 types of implants were evaluated. Sixteen rabbits received 2 types of external hex implants with similar geometry, either machined zirconia implants or PIM zirconia implants, in the tibiae. Removal torque tests and histomorphometric analyses were performed. The roughness of the PIM zirconia implants was higher than that of machined zirconia implants. The PIM zirconia implants exhibited significantly higher bone-implant contact and removal torque values than the machined zirconia implants (pzirconia implant is promising, and PIM, using the roughened mold etching technique, can produce substantially rougher surfaces on zirconia implants. PMID:26235717

  3. Estudio multicéntrico prospectivo con implantes MG-OSSEOUS a los 2 años de seguimiento Multicentric prospective study of MG-OSSEOUS implants at 2 year follow-up

    Directory of Open Access Journals (Sweden)

    E. Serrano

    2009-10-01

    Full Text Available Introducción. La implantología es uno de los procedimientos terapéuticos más realizados en nuestros días. El objetivo del presente estudio es presentar los resultados de los los implantes MG-OSSEOUS (Mozo-Grau, S.L., Valladolid, España a los 2 años de seguimiento. Material y método. La empresa Scientific Management in O&SS (Barcelona, España, diseñó unos cuestionarios exhaustivos que rellenaron, por cada caso, cada uno de los profesionales del estudio. La compilación y el tratamiento estadístico de los datos obtenidos fue extremadamente pormenorizada. Se aplicaron estudios de subpoblaciones desde la población N de implantes totales colocados y, mediante la aplicación de ANOVA, se valoraron parámetros concretos en dichas subpoblaciones para determinar y concluir la influencia de los mismos sobre el fracaso de los implantes. Resultados. Se colocaron 1475 implantes en 480 pacientes entre Junio de 2005 y Mayo de 2006, con una supervivencia del 98,2% con un seguimiento de 2 años de promedio con las prótesis cargadas. Se detallan los implantes por posiciones, diámetros y longitudes y se analizan los resultados en las subpoblaciones de implantes postexodoncia, implantes de carga inmediata e implantes asociados a injertos. Discusión. Se focaliza, realizando un amplio repaso de la bibliografía actual, en el alto fracaso obtenido en nuestro estudio de los implantes de diámetro ancho (4,25 mm postexodoncia y en la versatilidad del empleo de los implantes de diámetro estrecho (3,4 mm en cualquier posición oral para cualquier tipo de carga. Conclusiones. Este estudio es la completa antítesis de la filosofía, en el que se interpreta de una sola manera, científica y reproducible, una serie de resultados en el campo de la implantología oral, nuestra realidad. Seguiremos este estudio para alargar el tiempo observacional, como mínimo, a 5 años.Introduction. Implantology is the most common therapeutic procedure nowadays. Professor P

  4. 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...

  5. DENTAL IMPLANTS IN COMPLICATED EDENTULOUS PATIENTS

    Institute of Scientific and Technical Information of China (English)

    Katja Nelson

    2008-01-01

    @@ Dental implants have shown to increase retention and stability of dentures in the rehabilitation of edentulouspatients and still it remains one of the most complex restorative challenges due to a number of variables that affectthe esthetic and functional aspect of the prosthesis.Implant-retained prostheses must compensate forinsufficiencies while allowing the restoration of the white and the red esthetics and satisfying patient demands.

  6. [The implantable cardioverter-defibrillator: sometimes necessary

    NARCIS (Netherlands)

    Smeets, J.L.R.M.

    2004-01-01

    The implantable cardioverter-defibrillator (ICD) is used in patients who are at risk for ventricular fibrillation after having suffered from a myocardial infarction. Initially, patient selection was limited to survivors of impending sudden death with coronary artery disease. Later, ICD implantation

  7. Martensite transformation in antimony implanted stainless steel

    International Nuclear Information System (INIS)

    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 1020 ions/m2, 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.)

  8. Fatigue behaviour of titanium dental endosseous implants

    Directory of Open Access Journals (Sweden)

    Alessandro Scicutelli

    2011-10-01

    Full Text Available In this work two different titanium dental implants are analyzed in order to evaluate their mechanical strength. An ad-hoc designed experimental apparatus is prepared to test against fatigue these implants in a way that approximates as much as possible the actual stresses occurring during mastication motion. The results of these endurance tests are summarized in the form of Wohler-type diagrams showing the duration of a specific implant for different applied loads. These plots show a fatigue limit below which the implants could resist indefinitely. Other aspects of this research concern the influence of a potentially corrosive medium and the analysis of the deformation and failure of the specimens. During fatigue cycling, the titanium implants do not seem to be affected by a more aggressive environment, such as a saline solution. The analysis of the broken specimen allowed the crack initiation sites and the type of fracture propagation to be investigated in depth. In all the considered implants fatigue cracks were seen to initiate preferentially from sites in which the tensile stress concentration is the highest. The results of a finite element analysis performed on one of the specimens is in good agreement with the failure mode observed after the tests. The SEM fracture surface analysis shows a clear similarity between the fracture mode of the tested implants and of the actual implants broken after a certain operating period.

  9. Current trends to measure implant stability.

    Science.gov (United States)

    Swami, Vasanthi; Vijayaraghavan, Vasantha; Swami, Vinit

    2016-01-01

    Implant stability plays a critical role for successful osseointegration. Successful osseointegration is a prerequisite for functional dental implants. Continuous monitoring in an objective and qualitative manner is important to determine the status of implant stability. Implant stability is measured at two different stages: Primary and secondary. Primary stability comes from mechanical engagement with cortical bone. Secondary stability is developed from regeneration and remodeling of the bone and tissue around the implant after insertion and affected by the primary stability, bone formation and remodelling. The time of functional loading is dependent upon the implant stability. Historically the gold standard method to evaluate stability were microscopic or histologic analysis, radiographs, however due to invasiveness of these methods and related ethical issues various other methods have been proposed like cutting torque resistance, reverse torque analysis, model analysis etc. It is, therefore, of an utmost importance to be able to access implant stability at various time points and to project a long term prognosis for successful therapy. Therefore this review focuses on the currently available methods for evaluation of implant stability.

  10. Instrumentation of dental implants: a literature review

    Directory of Open Access Journals (Sweden)

    Fabiana de Almeida Curylofo

    2013-03-01

    Full Text Available Introduction and Objective: The aim of this study was to review the literature on the systems used to decontaminate the implant’s surface. Different instruments have been proposed, but there is no agreement in the literature about which methods would be more efficient with no damage to the implant surface. It was reported the use of plastic, carbon fiber, stainless-steel and titanium curettes and also the use of other systems such as ultrasonic points with different tips, rubber cups and air abrasion. Literature review: In most of the studies, the injury caused on the titanium surface at the time of instrumentation was examined. In others, the cell adhesion on the titanium dental implants following instrumentation of the implant surface was observed. Moreover, to enhance cleaning around implants, ultrasonic systems were recently tested. Conclusion: Metal instruments can lead to major damage to implant surface, therefore, they are not indicated for decontamination of dental implants surfaces. Furthermore, non-metallic instruments, such as plastic curettes, rubber cups, air abrasion and some ultrasonic systems seem to be better choices to remove calculus and plaque of the sub- and supra-gingival peri-implant area. It is noteworthy that more studies evaluating the effects of these systems are required to establish best practices to be used in the treatment of patients with dental implants.

  11. Risk factors of peri-implant pathology.

    Science.gov (United States)

    de Araújo Nobre, Miguel; Mano Azul, António; Rocha, Evangelista; Maló, Paulo

    2015-06-01

    This study aimed to identify risk factors for the incidence of peri-implant pathology. One-thousand, two-hundred and seventy-fifty patients (255 cases and 1020 controls), rehabilitated with dental implants, were included. Peri-implant pathology was defined as the presence of peri-implant pockets ≥ 5 mm, bleeding on probing, vertical bone loss, and loss of attachment ≥ 2 mm. Cases and controls were matched for age, gender, and duration of follow-up. A logistic regression model was used, with estimation of the OR for each variable and interaction, with a level of significance of 5%. The risk factors for peri-implant pathology were: history of periodontitis (OR = 19), bacterial plaque (OR = 3.6), bleeding (OR = 2.9), bone level on the medium third of the implant (OR = 13.9), lack of prosthetic fit or non-optimal screw joint (OR = 5.9), metal-ceramic restorations (OR = 3.9), and the interaction between bacterial plaque and the proximity of other teeth or implants (PROXI) (OR = 4.3). PROXI (OR = 0.44) exerted a protective effect when independent. Based on the results, peri-implant pathology represents a group of multifactorial situations with interaction of biological and biomechanical components in its pathogenesis. It was possible to model the condition and to assess, with high precision, the risk profile of each patient. PMID:25894059

  12. Percutaneously implanted markers in peripheral lung tumours

    DEFF Research Database (Denmark)

    Persson, G.F.; Josipovic, Mirjana; Nygaard, Ditte Eklund;

    2013-01-01

    A letter to the editor is presented which is concerned with research which investigated percutaneously implanted markers in peripheral lung tumours and their complications.......A letter to the editor is presented which is concerned with research which investigated percutaneously implanted markers in peripheral lung tumours and their complications....

  13. 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 stim

  14. 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...

  15. 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.

  16. Biofilm and dental implant: The microbial link

    Science.gov (United States)

    Dhir, Sangeeta

    2013-01-01

    Mouth provides a congenial environment for the growth of the microorganisms as compared to any other part of the human body by exhibiting an ideal nonshedding surface. Dental plaque happens to be a diverse community of the microorganisms found on the tooth surface. Periodontal disease and the peri-implant disease are specific infections that are originating from these resident microbial species when the balance between the host and the microbial pathogenicity gets disrupted. This review discusses the biofilms in relation to the peri-implant region, factors affecting its presence, and the associated treatment to manage this complex microbial colony. Search Methodology: Electronic search of the medline was done with the search words: Implants and biofilms/dental biofilm formation/microbiology at implant abutment interface/surface free energy/roughness and implant, periimplantitis/local drug delivery and dental implant. Hand search across the journals – clinical oral implant research, implant dentistry, journal of dental research, international journal of oral implantology, journal of prosthetic dentistry, perioodntology 2000, journal of periodontology were performed. The articles included in the review comprised of in vivo studies, in vivo (animal and human) studies, abstracts, review articles. PMID:23633764

  17. Femtosecond laser microstructuring of zirconia dental implants

    NARCIS (Netherlands)

    Delgado-Ruiz, R. A.; Calvo-Guirado, J. L.; Moreno, P.; Guardia, J.; Gomez-Moreno, G.; Mate-Sanchez, J. E.; Ramirez-Fernandez, P.; Chiva, F.

    2011-01-01

    This study evaluated the suitability of femtosecond laser for microtexturizing cylindrical zirconia dental implants surface. Sixty-six cylindrical zirconia implants were used and divided into three groups: Control group (with no laser modification), Group A (microgropored texture), and Group 13 (mic

  18. 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.

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

    International Nuclear Information System (INIS)

    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)

  20. METODOLOGÍA PARA UN ESTUDIO DIALECTAL URBANO: EL CASO DEL ESTUDIO DEL ESPAÑOL DE BUCARAMANGA METHODOLOGY FOR AN URBAN DIALECTAL STUDY: THE CASE OF THE SPANISH OF BUCARAMANGA

    Directory of Open Access Journals (Sweden)

    Luz Mary Rincón

    2007-12-01

    Full Text Available Una constante preocupación de los estudiosos de la lengua es el desarrollo de técnicas confiables en la investigación del habla en contextos urbanos con el fin de ofrecer una teoría de la lengua como se observa en su uso social. Para esto hay que tener en cuenta el aporte de la sociolingüística en el estudio de la lengua en su contexto social y toda aquella gama de contribuciones que se han alejado de las tradicionales técnicas usadas en dialectología. En el presente artículo se da cuenta de la metodología utilizada en cada una de las etapas en el estudio del español de Bucaramanga con el fin de mostrar un modelo metodológico que pueda servir como punto de partida en la exploración de otras hablas urbanas en Colombia. La propuesta expuesta se presenta únicamente como una alternativa de trabajo aceptando que llegar a la técnica ideal para el estudio de fenómenos sociolingüísticos urbanos constituye un ideal que esta aún por resolverse. Este modelo metodológico se ha valido de ensayos anteriores y de propuestas con respecto a la recolección, la selección y el análisis de datos con el fin de llegar de mejor forma, no al sistema lingüístico ideal, sino al habla vernácula que se desea describir.The methodological model described here is based on developments in sociolinguistic research which have resulted from a constant concern for the design and implementation of techniques that reflect the language in its social context, departing from the dialectological tradition to the analysis of language. The present monograph is a description of the methodology used in the study of the main phonological, morph-syntactic, lexical and discourse features of the Spanish of Bucaramanga ( Colombia . The methodological approach presented here is based on the experience of previous studies in the collection, selection, and analysis of data and methodological improvement from these experiences to better converge on the linguistic system that

  1. Biodiversidad del margen continental del Caribe colombiano.

    OpenAIRE

    2010-01-01

    Incluye valiosa información producto de varios años de investigación marina de las aguas profundas, la plataforma continental y el talud superior del Caribe colombiano, llevada a cabo por un grupo multidisciplinario de investigadores en áreas de taxonomía, geología, ecología, cartografía y conservación del Invemar. Dentro de los resultados más destacados se encuentra el haber colectado e identificado más de 1600 especies, de las cuales alrededor del 35% se constituyeron en primeros registr...

  2. Effectiveness of the radio sterilized amniotic membrane transplantation vs conjunctival auto graft implant in the pterygium surgery with intraoperative mitomycin C;Eficacia del trasplante de membrana amniotica radioesterilizada vs injerto autologo conjuntival en la cirugia de pterigion con mitocomina C intraoperatoria

    Energy Technology Data Exchange (ETDEWEB)

    Tellez Y, L.; Martinez P, M. E. [ININ, Banco de Tejidos Radioesterilizados, Carretera Mexico-Toluca s/n, Ocoyoacac 52750, Estado de Mexico (Mexico); Vazquez M, L. [Hospital General de Mexico, Departamento de Cornea, Dr. Balmis No. 148, Col. Doctores, 06726 Mexico D. F. (Mexico)

    2009-07-01

    At the present time the traditional surgical handling of the pterygium with conjunctival implant presents high frequency. In this work the obtained results of a controlled clinic practice blind double are presented of the period of December from 2008 to December 2009, realized in the Medical Unit of Ambulatory Attention 231 of the Mexican Institute of the Public Health located in Metepec, Mexico State, in order to demonstrate the effectiveness and security of the alternative use of the radio sterilized amniotic membrane and intraoperative mitomycin C. For the study was included patients with diagnostic of primary nasal pterygium in one or both eyes, adults of both genus with an age range of 20 to 60 years, and was used radio sterilized amniotic membrane processed in the Bank of Radio Sterilized Tissues of the National Institute of Nuclear Research. (Author)

  3. Dyspnea Associated with Silicone Breast Implant Rupture

    Directory of Open Access Journals (Sweden)

    Katherine Rider

    2015-08-01

    Full Text Available We present a case of a 48-year-old woman with a significant history of atopy. She presented with a 1-month history of dyspnea on exertion. Pulmonary function testing was normal, with no obstruction or reversibility post-bronchodilation. Bilateral breast implant rupture was detected on further investigation for a left upper lobe nodule, and the patient underwent bilateral implant removal. There was an improvement in her respiratory symptoms. Systemic symptoms, labeled as “Autoimmune/Inflammatory Syndrome Induced by Adjuvants,” are known to be associated with breast implants, with 14% of women in a cohort developing autoimmune disease secondary to their implants. An improvement in symptoms has been demonstrated following breast implant removal.

  4. 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.

  5. Bone manipulation procedures in dental implants.

    Science.gov (United States)

    Mittal, Yuvika; Jindal, Govind; Garg, Sandeep

    2016-01-01

    The use of dental implants for the rehabilitation of missing teeth has broadened the treatment options for patients and clinicians equally. As a result of advances in research in implant design, materials, and techniques, the use of dental implants has increased dramatically in the past two decades and is expected to expand further in the future. Success of dental implants depends largely on the quality and quantity of the available bone in the recipient site. This however may be compromised or unavailable due to tumor, trauma, periodontal disease, etc., which in turn necessitates the need for additional bone manipulation. This review outlines the various bone manipulation techniques that are used to achieve a predictable long-term success of dental implants.

  6. Dental implants in patients with bruxing habits.

    Science.gov (United States)

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

    2006-02-01

    Bruxism (teeth grinding and clenching) is generally considered a contraindication for dental implants, although the evidence for this is usually based on clinical experience only. So far, studies to the possible cause-and-effect relationship between bruxism and implant failure do not yield consistent and specific outcomes. This is partly because of the large variation in the literature in terms of both the technical aspects and the biological aspects of the study material. Although there is still no proof for the suggestion that bruxism causes an overload of dental implants and of their suprastructures, a careful approach is recommended. There are a few practical guidelines as to minimize the chance of implant failure. Besides the recommendation to reduce or eliminate bruxism itself, these guidelines concern the number and dimensions of the implants, the design of the occlusion and articulation patterns, and the protection of the final result with a hard occlusal stabilization splint (night guard). PMID:16457676

  7. Bone manipulation procedures in dental implants

    Science.gov (United States)

    Mittal, Yuvika; Jindal, Govind; Garg, Sandeep

    2016-01-01

    The use of dental implants for the rehabilitation of missing teeth has broadened the treatment options for patients and clinicians equally. As a result of advances in research in implant design, materials, and techniques, the use of dental implants has increased dramatically in the past two decades and is expected to expand further in the future. Success of dental implants depends largely on the quality and quantity of the available bone in the recipient site. This however may be compromised or unavailable due to tumor, trauma, periodontal disease, etc., which in turn necessitates the need for additional bone manipulation. This review outlines the various bone manipulation techniques that are used to achieve a predictable long-term success of dental implants. PMID:27433052

  8. Diagnostic imaging for dental implant therapy.

    Science.gov (United States)

    Nagarajan, Aishwarya; Perumalsamy, Rajapriya; Thyagarajan, Ramakrishnan; Namasivayam, Ambalavanan

    2014-01-01

    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. PMID:25379354

  9. Effectiveness of Implant Therapy Analyzed in a Swedish Population

    Science.gov (United States)

    Derks, J.; Håkansson, J.; Wennström, J.L.; Tomasi, C.; Larsson, M.; Berglundh, T.

    2015-01-01

    Treatment outcomes in implant dentistry have been mainly assessed as implant survival rates in small, selected patient groups of specialist or university clinical settings. This study reports on loss of dental implants assessed in a large and randomly selected patient sample. The results were aimed at representing evaluation of effectiveness of implant dentistry. Using the national data register of the Swedish Social Insurance Agency, 4,716 patients were randomly selected. All had been provided with implant-supported restorative therapy in 2003. Patient files of 2,765 patients (11,311 implants) were collected from more than 800 clinicians. Information on patients, treatment procedures, and outcomes related to the implant-supported restorative therapy was extracted from the files. In total, 596 of the 2,765 subjects, provided with 2,367 implants, attended a clinical examination 9 y after therapy. Implant loss that occurred prior to connection of the supraconstruction was scored as an early implant loss, while later occurring loss was considered late implant loss. Early implant loss occurred in 4.4% of patients (1.4% of implants), while 4.2% of the patients who were examined 9 y after therapy presented with late implant loss (2.0% of implants). Overall, 7.6% of the patients had lost at least 1 implant. Multilevel analysis revealed higher odds ratios for early implant loss among smokers and patients with an initial diagnosis of periodontitis. Implants shorter than 10 mm and representing certain brands also showed higher odds ratios for early implant loss. Implant brand also influenced late implant loss. Implant loss is not an uncommon event, and patient and implant characteristics influence outcomes (ClinicalTrials.gov NCT01825772). PMID:25503901

  10. 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

  11. 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.

  12. Estudio microbiológico de la periimplantitis: Presentación de 9 casos clínicos Microbiological study of the peri-implantitis: presentation of 9 clinical case

    Directory of Open Access Journals (Sweden)

    M. Quinteros Borgarello

    2000-12-01

    Full Text Available Objetivos: La periimplantitis es un proceso inflamatorio de los tejidos que rodean a un implante sometido a carga que produce la pérdida de soporte óseo. En este trabajo se muestran los resultados del estudio microbiológico y del antibiograma realizado a partir del exudado y/o del tejido periimplantario de 16 implantes funcionales con periimplantitis de 9 pacientes que fueron tratados en nuestro servicio. Material y método: Se estudiaron 16 periimplantitis observadas en 9 pacientes; de 14 de ellas se obtuvieron muestras con puntas de papel estériles que se introdujeron en la bolsa periimplantaria. En 2 implantes las muestras procedian de tejido de granulación periimplantario. Inmediatamente después de ser obtenidas, se colocaban en placas de agar-chocolate con brain heart infusion para proceder a su cultivo. Resultados: Los especímenes bacterianos aislados fueron: Stomatococcus, Prevotella oralis, Peptostreptococcus y Fusobacterium nucleatum. En 9 muestras fue imposible aislar una bacteria predominante debido a la complejidad de la flora. Respecto al resto de muestras, la bacteria predominante fue Stomatococcus en 3, Prevotella oralis en 1,Peptostreptococcus en 1 y Fusobacterium nucleatum en 2. Los antibiogramas mostraron una mayor sensibilidad a la asociación de la amoxicilina con el ácido clavulánico, comparada con la amoxicilina, el metronidazol o una combinación de estos dos últimos antimicrobianos. Conclusiones: En este trabajo las bacterias asociadas más frecuentemente a la periimplantitis fueron: Stomatococcus, Prevotella oralis, Peptostreptococcus y Fusobacterium nucleatum. En ningún caso se aislaron cepas de Actinobacillus actinomycetemcomitans. Los posibles factores de riesgo asociados a periimplantitis en nuestra serie fueron los implantes recubiertos con hidroxiapatita, implantes de 3,25mm de diámetro y la localización más distal del implante en las prótesis que rehabilitaban extremos libres edéntulos superiores

  13. The clinical implications of poly implant prothèse breast implants: an overview.

    Science.gov (United States)

    Wazir, Umar; Kasem, Abdul; Mokbel, Kefah

    2015-01-01

    Mammary implants marketed by Poly Implant Prothèse (PIP) were found to contain industrial grade silicone and this caused heightened anxiety and extensive publicity regarding their safety in humans. These implants were used in a large number of patients worldwide for augmentation or breast reconstruction. We reviewed articles identified by searches of Medline, PubMed, Embase, and Google Scholar databases up to May 2014 using the terms: "PIP", "Poly Implant Prothèse", "breast implants" and "augmentation mammoplasty" "siloxanes" or "silicone". In addition the websites of regulating bodies in Europe, USA, and Australia were searched for reports related to PIP mammary implants. PIP mammary implants are more likely to rupture than other implants and can cause adverse effects in the short to the medium term related to the symptoms of rupture such as pain, lumps in the breast and axilla and anxiety. Based on peer-reviewed published studies we have calculated an overall rupture rate of 14.5% (383/2,635) for PIP implants. However, there is no evidence that PIP implant rupture causes long-term adverse health effects in humans so far. Silicone lymphadenopathy represents a foreign body reaction and should be treated conservatively. The long-term adverse effects usually arise from inappropriate extensive surgery, such as axillary lymph node dissection or extensive resection of breast tissue due to silicone leakage.

  14. Histology of a dental implant with a platform switched implant-abutment connection

    Directory of Open Access Journals (Sweden)

    Vittoria Perrotti

    2011-10-01

    Full Text Available Background: Peri-implant crestal bone must be stable for aesthetic reasons. Aim of this study was a histologic analysis of an implant with a platform switched implant-abutment connection. Materials and methods: A 32-year-old male patient participated in this study. The patient needed a bilateral mandibular restoration. Four implants were used, and were immediately restored and loaded the same day of insertion. After a 6 weeks healing period, one implant with platform-switched abutment was retrieved with trephine. Before retrieval the implant was osseointegrated and not mobile. On one side of the implant, a 1 mm resorption of the crestal bone was present. On the contrary, on the other side no bone resorption had occurred and about 1 mm of bone was present over the implant shoulder. Results: The bone-implant contact percentage was 65.1 ± 6.3 %. Platform- switching could help in maintaining the height of the peri-implant crestal bone.

  15. Facies del subfondo del canal Beagle, Tierra del Fuego

    Directory of Open Access Journals (Sweden)

    Gustavo Bujalesky

    2004-03-01

    Full Text Available El canal Beagle conecta los océanos Pacífico y Atlántico en el extremo meridional de Sudamérica y se ubica en el ambiente subantártico. Conforma una cuenca de unos 300 m de profundidad máxima y está separada del océano Atlántico por un umbral de 30 m de profundidad. El canal es un valle tectónico que fue completamente cubierto por el hielo glacial durante la última glaciación. Posteriormente, el canal fue ocupado por un lago glacial desde los 12.000 a los 8.000 años A.P., cuando fue invadido por el mar que alcanzó un nivel máximo entre los 6.000 y 5.000 años A.P. Con el objetivo de analizar las facies sedimentarias superficiales y del subfondo del canal se realizó un relevamiento geofísico con sonar de barrido lateral y un perfilador de 3,5 kHz. Sobre un basamento constituido por rocas metamórficas del Mesozoico, se identificaron depósitos de till y secuencias granodecrecientes que representan distintos estadios del retroceso glaciar, evidenciando hacia la sección superior facies lacustres y por encima depósitos de la transgresión marina del Holoceno. Además, se han identificado paleocauces y secuencias fluviales cubiertas por sedimentos marinos transgresivos.

  16. Changes in the surface of bone and acid-etched and sandblasted implants following implantation and removal

    Science.gov (United States)

    Eroglu, Cennet Neslihan; Ertugrul, Abdullah Seckin; Eskitascioglu, Murat; Eskitascioglu, Gurcan

    2016-01-01

    Objective: The aim of this study was to determine whether there are any changes in the surface of bone or implant structures following the removal of a screwed dental implant. Materials and Methods: For this, six individual samples of acid-etched and sandblasted implants from three different manufacturers’ implant systems were used. They were screwed in a D1 bovine bone, and they were removed after primary stabilization. The bone and implant surfaces are evaluated with scanning electron microscope. Results: Through examination of the surfaces of the bone prior to implantation and of the used and unused implant surfaces, it was found that inhomogeneity in the implant surface can cause microcracking in the bone. Conclusions: This is attributed to the stress induced during the implantation of self-tapping implants and suggests that a tap drill may be required in some instances to protect the implant surface. PMID:27011744

  17. Brainjacking: Implant Security Issues in Invasive Neuromodulation.

    Science.gov (United States)

    Pycroft, Laurie; Boccard, Sandra G; Owen, Sarah L F; Stein, John F; Fitzgerald, James J; Green, Alexander L; Aziz, Tipu Z

    2016-08-01

    The security of medical devices is critical to good patient care, especially when the devices are implanted. In light of recent developments in information security, there is reason to be concerned that medical implants are vulnerable to attack. The ability of attackers to exert malicious control over brain implants ("brainjacking") has unique challenges that we address in this review, with particular focus on deep brain stimulation implants. To illustrate the potential severity of this risk, we identify several mechanisms through which attackers could manipulate patients if unauthorized access to an implant can be achieved. These include blind attacks in which the attacker requires no patient-specific knowledge and targeted attacks that require patient-specific information. Blind attacks include cessation of stimulation, draining implant batteries, inducing tissue damage, and information theft. Targeted attacks include impairment of motor function, alteration of impulse control, modification of emotions or affect, induction of pain, and modulation of the reward system. We also discuss the limitations inherent in designing implants and the trade-offs that must be made to balance device security with battery life and practicality. We conclude that researchers, clinicians, manufacturers, and regulatory bodies should cooperate to minimize the risk posed by brainjacking.

  18. Informed Consent, Deaf Culture, and Cochlear Implants.

    Science.gov (United States)

    Pass, Lauren; Graber, Abraham D

    2015-01-01

    While cochlear implantation is now considered routine in many parts of the world, the debate over how to ethically implement this technology continues. One's stance on implantation often hinges on one's understanding of deafness. On one end of the spectrum are those who see cochlear implants as a much needed cure for an otherwise intractable disability. On the other end of the spectrum are those who view the Deaf as members of a thriving culture and see the cochlear implant as an attempt to eliminate this culture. Rather than take a stance in this debate, we will argue that the informed consent process for cochlear implantation must include access to Deaf perspectives. Deaf individuals know best what it is like to be a member of the Deaf community; the reasonable person would put significant weight on the testimony of Deaf individuals when considering whether to undergo cochlear implantation. The reasonable person standard determines what information careproviders must present as part of the informed consent process; thus, informed consent for cochlear implantation requires access to the testimony of Deaf individuals. PMID:26399672

  19. Single atom devices by ion implantation

    International Nuclear Information System (INIS)

    To expand the capabilities of semiconductor devices for new functions exploiting the quantum states of single donors or other impurity atoms requires a deterministic fabrication method. Ion implantation is a standard tool of the semiconductor industry and we have developed pathways to deterministic ion implantation to address this challenge. Although ion straggling limits the precision with which atoms can be positioned, for single atom devices it is possible to use post-implantation techniques to locate favourably placed atoms in devices for control and readout. However, large-scale devices will require improved precision. We examine here how the method of ion beam induced charge, already demonstrated for the deterministic ion implantation of 14 keV P donor atoms in silicon, can be used to implant a non-Poisson distribution of ions in silicon. Further, we demonstrate the method can be developed to higher precision by the incorporation of new deterministic ion implantation strategies that employ on-chip detectors with internal charge gain. In a silicon device we show a pulse height spectrum for 14 keV P ion impact that shows an internal gain of 3 that has the potential of allowing deterministic implantation of sub-14 keV P ions with reduced straggling. (paper)

  20. Brainjacking: Implant Security Issues in Invasive Neuromodulation.

    Science.gov (United States)

    Pycroft, Laurie; Boccard, Sandra G; Owen, Sarah L F; Stein, John F; Fitzgerald, James J; Green, Alexander L; Aziz, Tipu Z

    2016-08-01

    The security of medical devices is critical to good patient care, especially when the devices are implanted. In light of recent developments in information security, there is reason to be concerned that medical implants are vulnerable to attack. The ability of attackers to exert malicious control over brain implants ("brainjacking") has unique challenges that we address in this review, with particular focus on deep brain stimulation implants. To illustrate the potential severity of this risk, we identify several mechanisms through which attackers could manipulate patients if unauthorized access to an implant can be achieved. These include blind attacks in which the attacker requires no patient-specific knowledge and targeted attacks that require patient-specific information. Blind attacks include cessation of stimulation, draining implant batteries, inducing tissue damage, and information theft. Targeted attacks include impairment of motor function, alteration of impulse control, modification of emotions or affect, induction of pain, and modulation of the reward system. We also discuss the limitations inherent in designing implants and the trade-offs that must be made to balance device security with battery life and practicality. We conclude that researchers, clinicians, manufacturers, and regulatory bodies should cooperate to minimize the risk posed by brainjacking. PMID:27184896

  1. Plasma immersion ion implantation for silicon processing

    Science.gov (United States)

    Yankov, Rossen A.; Mändl, Stephan

    2001-04-01

    Plasma Immersion Ion Implantation (PIII) is a technology which is currently widely investigated as an alternative to conventional beam line implantation for ultrashallow doping beyond the 0.15 m technology. However, there are several other application areas in modern semiconductor processing. In this paper a detailed discussion of the PIII process for semiconductors and of actual as well as future applications is given. Besides the well known advantages of PIII - fast process, implantation of the whole surface, low cost of ownership - several peculiarities - like spread of the implantation energy due to finite rise time or collisions, no mass separation, high secondary electron emission - must be mentioned. However, they can be overcome by adjusting the system and the process parameters. Considering the applications, ultrashallow junction formation by PIII is an established industrial process, whereas SIMOX and Smart-Cut by oxygen and hydrogen implantation are current topics between research and introduction into industry. Further applications of PIII, of which some already are research topics and some are only investigated by conventional ion implantation, include seeding for metal deposition, gettering of metal impurities, etch stop layers and helium implantation for localized lifetime control.

  2. Immunological Response to Biodegradable Magnesium Implants

    Science.gov (United States)

    Pichler, Karin; Fischerauer, Stefan; Ferlic, Peter; Martinelli, Elisabeth; Brezinsek, Hans-Peter; Uggowitzer, Peter J.; Löffler, Jörg F.; Weinberg, Annelie-Martina

    2014-04-01

    The use of biodegradable magnesium implants in pediatric trauma surgery would render surgical interventions for implant removal after tissue healing unnecessary, thereby preventing stress to the children and reducing therapy costs. In this study, we report on the immunological response to biodegradable magnesium implants—as an important aspect in evaluating biocompatibility—tested in a growing rat model. The focus of this study was to investigate the response of the innate immune system to either fast or slow degrading magnesium pins, which were implanted into the femoral bones of 5-week-old rats. The main alloying element of the fast-degrading alloy (ZX50) was Zn, while it was Y in the slow-degrading implant (WZ21). Our results demonstrate that degrading magnesium implants beneficially influence the immune system, especially in the first postoperative weeks but also during tissue healing and early bone remodeling. However, rodents with WZ21 pins showed a slightly decreased phagocytic ability during bone remodeling when the degradation rate reached its maximum. This may be due to the high release rate of the rare earth-element yttrium, which is potentially toxic. From our results we conclude that magnesium implants have a beneficial effect on the innate immune system but that there are some concerns regarding the use of yttrium-alloyed magnesium implants, especially in pediatric patients.

  3. Transverse microanalysis of high energy Ion implants

    Energy Technology Data Exchange (ETDEWEB)

    Dooley, S.P.; Jamieson, D.N.; Nugent, K.W.; Prawer, S. [Melbourne Univ., Parkville, VIC (Australia). School of Physics

    1996-12-31

    High energy ion implants in semiconductor materials have been analyzed by Channeling Contrast Microscopy (CCM) perpendicular to the implant direction, allowing imaging of the entire ion track. The damage produced by Channeled and Random 1.4 MeV H{sup +} implants into the edge of a <100> type IIa diamond wafer were analyzed by channeling into the face of the crystal. The results showed negligible damage in the surface region of the implants, and swelling induced misalignment at the end of range of the implants. Channeled 1.4 MeV H{sup +} implants in diamond had a range only 9% deeper than Random implants, which could be accounted for by dechanneling of the beam. The channeling of H{sup +}{sub 2} ions has been previously found to be identical to that of protons of half energy, however the current experiment has shown a 1% increase in {chi}{sub min} for H{sup +}{sub 2} in diamond compared to H{sup +} at 1,2 MeV per proton. This is due to repulsion between protons within the same channel. 5 refs., 2 figs.

  4. A implantação do projeto de atendimento Móvel de Urgência em Salvador/BA: panorama e desafios La implantación del proyecto de Atención de Urgencia Móvil en Salvador/BAHIA: panorama y retos Implantation of the Emergency Ambulance Service in Salvador, Bahia: reality and challenges

    Directory of Open Access Journals (Sweden)

    Célia Maria Sales Vieira

    2008-12-01

    Full Text Available O estudo objetivou relatar a experiência na implantação e estruturação do projeto do Serviço Móvel de Urgência (SAMU-192, em Salvador, cujas bases legais foram portarias do Ministério da Saúde e a Norma Operacional de Assistência à Saúde 02/2002. O serviço tem como finalidade prestar assistência gratuita ao indivíduo, em um primeiro nível de atenção, com agravos de natureza clínica, cirúrgica, traumática e psiquiátrica que acarretam sofrimento, seqüelas ou morte e ocorrem fora do ambiente hospitalar. O objetivo específico foi garantir o atendimento às situações de urgência e emergência por meio do SAMU-192, regulado, hierarquizado e integrado ao Sistema Único de Saúde, assegurando recursos públicos inclusive integrados à rede complementar de assistência. Despesas para sua instalação foram pactuadas no município e em comissões intergestoras federal e estadual. Os desafios do serviço incluem educação comunitária, capacitação profissional, avaliação de recursos humanos e materiais, na dinâmica e qualidade da atenção.El estudio tuvo por objetivo narrar la experiencia sobre la implantación y estructuración del proyecto de Servicio de Urgencia Móvil (SAMU-192 en Salvador, basado legalmente por decretos del Ministerio de Salud y la Norma Operacional de Asistencia a la Salud 02/2002. La finalidad del servicio es brindar asistencia gratuita fuera del hospital al individuo en un primer nivel de atención, en casos de tipo clínico, quirúrgico, traumático y psiquiátrico que provocan sufrimiento, secuelas o muerte. El objetivo específico fue garantizar la atención en casos de urgencia y emergencia a través del SAMU-192, reglamentado, jerarquizado e integrado al Sistema Único de Salud, asegurando recursos públicos, inclusive integrados a la red complementaria de asistencia. Gastos por instalación fueron establecidos entre la municipalidad y comisiones inter-gestoras federales y estatales. Como

  5. Estudio del proceso de crecimiento del cultivo del tomate

    OpenAIRE

    Barraza, Fernando V.; Fischer, Gerhard; Cardona, Carlos E.

    2010-01-01

    Para conocer la densidad poblacional óptimay obtener el mayor rendimiento en el cultivo deltomate en el Valle del Sinú medio, se hizo una investigaciónmediante diseño completamente al azar con cuatrotratamientos (densidades poblacionales de 20.000,25.000, 33.333 y 50.000 plantas∙ha -1) y tres repeticiones.Se tomaron las medidas directas: altura de planta, númerode hojas, área foliar, número de frutos y rendimiento.También se calcularon los índices de crecimiento: tasa decrecimiento del cultiv...

  6. Efecto del Tisuacryl sobre la mucosa oral

    Directory of Open Access Journals (Sweden)

    Gastón García-Simons

    2006-01-01

    Full Text Available Los ensayos estipulados para el registro de los equipos médico, biomateriales y materiales implantables están regidos por un conjunto de normas que regulan cuáles deben efectuarse. En dependencia del tipo de aplicaci ón que se pretende dar al material en estudio o el tiempo del contacto con el organismo, así será el rigor que se exija para la evaluación. Con el objetivo de ampliar a la zona de la boca las aplicaciones del adhesivo tisular compuesto por cianoacrilato de n-butilo, de fabricación nacional, Tisuacryl, se efectuó la evaluaci ón de la irritación que provoca el producto a la mucosa oral. Estos productos están constituidos entre otras cosas por monómeros de cianoacrilato de nbutilo, que polimerizan con facilidad por contacto con sustratos orgánicos e inorgánicos por lo que exigen un tratamiento especial para aplicar la metodología seleccionada sin invalidar el resultado de las evaluaciones. En los experimentos que se desarrollaron se pudo aplicar directamente la norma internacional vigente con la utilización de un circulo plástico para delimitar la zona de aplicación del adhesivo. En la evaluación macroscópica se encontró una irritación ligera según la puntuación obtenida y en la histológica se observó una irritación promedio de 3,4, lo que le confiere al producto una irritación mínima, aceptable para el uso en mucosa. No obstante los resultados, es recomendable ampliar el estudio incorporando ensayos que no recoge la norma vigente, tales como la evaluación del comportamiento del adhesivo frente a las enzimas bucales antes de su aplicación oral, pues se conoce que tales productos son degradados por dichas enzimas en un corto período. Esto permitiría obtener una informaci ón más completa acerca de la toxicidad del adhesivo.

  7. Inserción de un implante simultáneo a la extracción de un canino superior incluido Insertion of a simultaneous implant in the extraction of an upper included canine

    Directory of Open Access Journals (Sweden)

    R Flores-Ruiz

    2007-08-01

    Full Text Available Presentamos el caso clínico de una paciente adulta con un canino superior incluido, en la que se llevó a cabo un plan de tratamiento multidisciplinar y secuencial quirúrgico-ortodóncico-protésico. En un primer tiempo, se instauró un tratamiento ortodóncico con el que disponer de un espacio intercalar adecuado para la posterior reposición del canino superior. En un segundo tiempo, se realizó la extracción del canino incluido junto con un tratamiento combinado de regeneración ósea e inserción inmediata de un implante, para finalizar con la restauración protésica mediante una corona implantosoportada. Se revisa además la literatura al respecto y el estado actual del problemaWe present a clinical case of an adult patient with an impacted upper canine, a multidisciplinary and sequential surgical-orthodontist-prosthetic treatment plan was made. In a first time, an orthodontic treatment was established in order to have a suitable space to a later upper canine replacement. In a second instance, the extraction of the canine was done, including a combined treatment of bone regeneration, with an immediate insertion of an implant. To conclude the treatment a prosthetic restoration with a crown supported on an implant was completed. Review of the literature was done in order to present the actual situation of the problem

  8. Immediate CAD/ CAM Custom Fabricated Dental Implants

    Directory of Open Access Journals (Sweden)

    Jafar Kolahi

    2010-11-01

    Full Text Available Introduction: There will almost always be gaps between cylin-drical or screw shaped prefabricated implant surface and funnel-shaped tooth socket when an implant is placed immediately after tooth extraction. Hence expensive and difficult bone grafting is re-quired. A custom fabricated implant will be a pragmatic solution for this limitation.The hypothesis: First step following extraction of a tooth is data capture or scanning via a 3D scan method e.g. coordinate measuring machine or non-contact laser scanners such as triangulation range finder. Second step is reconstruction or modeling via editable CAD (computer-aided design model, allowing us to add retentive holes and correction of implant angle. Third step is fabrication via CAM (computer aided manufacturing followed by plasma cleaning process. Fourth step is insertion of the CAD/CAM custom fabricated one-stage implant in the fresh tooth socket. Optimal time for this step is 24-48 hours after extraction. The custom fabricated implant should not load 3-4 months. Usage of chlorhexidine mouth-rinse or chewing gum twice daily for 2 weeks and, in some cases oral antibiotic is recommended. Evaluation of the hypothesis: Contemporary dental implant system faced with several clinical and anatomical limitations such is low sinuses or nerve bundles. Complex and expensive surgical procedures such as nerve repositioning and sinus lift are frequently required. With custom fabricated implant we can overcome several of these limitations because insertion of custom fabricated implant will perform before alveolar bone recession.

  9. Ion implantation of boron in germanium

    Energy Technology Data Exchange (ETDEWEB)

    Jones, K.S.

    1985-05-01

    Ion implantation of /sup 11/B/sup +/ 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 /sup 11/B/sup +/ into Ge results in 100% of the boron ions being electrically active as shallow acceptor, over the entire dose range (5 x 10/sup 11//cm/sup 2/ to 1 x 10/sup 14//cm/sup 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 (<1 x 10/sup 12//cm/sup 2/). Three damage related hole traps are produced by ion implantation of /sup 11/B/sup +/. Two of these hole traps have also been observed in ..gamma..-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 (<300/sup 0/C). Boron, from room temperature implantation of BF/sub 2//sup +/ into Ge, is not substitutionally active prior to a post implant annealing step of 250/sup 0/C for 30 minutes. After annealing additional shallow acceptors are observed in BF/sub 2//sup +/ implanted samples which may be due to fluorine or flourine related complexes which are electrically active.

  10. Psicodrama del duelo.

    Directory of Open Access Journals (Sweden)

    José Antonio Espina Barrio

    1997-01-01

    Full Text Available La pérdida de rituales agrava y alarga la reacción del duelo. Se define el Psicodrama Antropológico y su intervención en el proceso del duelo. El Psicodrama Focal del Duelo es una psicoterapia breve centrada en el proceso de Duelo. Se comentan varios casos y resultados. Se concluye con un programa sencillo para el duelo en Atención Primaria.

  11. Análisis fotoelástico descriptivo de dos diferentes diseños de implantes endoóseos sometidos a carga de compresión vertical Descriptive photoelastical analysis of two different dental implants design submitted to vertical compression load

    Directory of Open Access Journals (Sweden)

    M. Jaimes

    2009-12-01

    Full Text Available El objetivo de este estudio fue analizar la distribución de las tensiones generadas en los modelos fotoelásticos posterior a la aplicación de cargas verticales a 7,5 N, en dos diferentes diseños de implantes endoóseos. Fueron seleccionados 2 implantes con diferentes configuraciones: Implante (Máster Conect Cônico® 4,13x13 mm e Implante (Titamax Ti Medula® 3,75x13 mm. Para el análisis de la distribución de tensiones fueron confeccionados 2 modelos en resinas fotoelástica con dimensiones de 40x10 mm de base y 30 mm de altura. Cada implante posicionado en los modelos recibieron carga vertical a 7,5 N, siendo posible visualizar las franjas isocromáticas generadas en los modelos, a través del polariscopio. El implante Máster Conect Cônico® con hexágono interno largo, porción cervical pulida, tope de las roscas redondeadas, pasos de las roscas continuas, distancia entre estas de 0,5 décimas de milímetros, espirales angulados y ápice cónico presento concentración de las tensiones en la región apical. El implante cilíndrico, Titamax Ti Medula®, con hexágono externo, porción cervical pulida, con tope de las roscas en forma de v, paso de rosca continuo, con distancia entre las roscas de 0.5 décimas de milímetros, espirales angulados y ápice redondeado presento distribución de las tensiones en la región apical medio y cervical del implante. Basado en los resultados de este estudio puede concluirse que: el implante de configuración cónica concentró las tensiones en región apical, siendo que el implante de configuración cilíndrica concentro las tensiones en la región apical medio y cervical del implante.The objective of this study was to analyze the subsequent tensions distribution generated in the photoelastic models after application 7.5 N vertical loads, in two different dental implant designs. It were selected two different configuration implants, being one conic (Másters Conect Cônico® 4.13x13 mm and the other

  12. Mechanisms of implantation: strategies for successful pregnancy.

    Science.gov (United States)

    Cha, Jeeyeon; Sun, Xiaofei; Dey, Sudhansu K

    2012-12-01

    Physiological and molecular processes initiated during implantation for pregnancy success are complex but highly organized. This review primarily highlights adverse ripple effects arising from defects during the peri-implantation period that perpetuate throughout pregnancy. These defects are reflected in aberrations in embryo spacing, decidualization, placentation and intrauterine embryonic growth, manifesting in preeclampsia, miscarriages and/or preterm birth. Understanding molecular signaling networks that coordinate strategies for successful implantation and decidualization may lead to approaches to improve the outcome of natural pregnancy and pregnancy conceived from in vitro fertilization.

  13. Implant rehabilitation of partial maxillectomy edentulous patien

    Directory of Open Access Journals (Sweden)

    Mahesh E Gowda

    2013-01-01

    Full Text Available Edentulous patients with maxillectomy defects present a significant challenge for prosthetic rehabilitation and the adaptive capabilities of the patient as retention is highly compromised. Hence, the option of using endosseous implants to increase obturator retention has been used. A patient of mucormycosis of the left maxilla was treated with surgical excision. After satisfactory healing, definitive implant supported magnet retained prosthesis was fabricated for the patient. Implants with magnetic units offer a practical method of improving the retention of obturators provided acceptable prosthetic protocols are followed for the rehabilitation.

  14. The diagnosis of breast implant rupture

    DEFF Research Database (Denmark)

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

    2005-01-01

    STUDY OBJECTIVE: The aim of this study was to evaluate the accuracy of Magnetic Resonance Imaging (MRI) as performed according to a strict study protocol in diagnosing rupture of silicone breast implants. MATERIAL AND METHODS: The study population consisted of 64 women with 118 implants, who had......%, and a specificity of 97%. Correspondingly, the predictive value of a positive MRI examination was 99% and the predictive value of a negative MRI examination was 79%. CONCLUSIONS: We conclude that MRI is highly accurate for identification of silicone breast implant rupture, with a high sensitivity and specificity...

  15. Implanted Antennas in Medical Wireless Communications

    CERN Document Server

    Rahmat-Samii, Yahya; Balanis, Constantine

    2006-01-01

    Implanted Antennas in Medical Wireless Communications summarizes the results of recent research activities on the subject of implanted antennas for medical wireless communication systems. It is anticipated that in the near future sophisticated medical devices will be implanted inside the human body for medical telemetry and telemedicine. To establish effective and efficient wireless links with these devices, it is pivotal to give special attention to antenna designs that are low profile, small, safe, and cost effective. In this book, authors Yahya Rahmat-Samii and Jaehoon Kim demonstrate how a

  16. Dislocation climb in copper after ion implantation

    International Nuclear Information System (INIS)

    At present, ion implantation is used widely for the modification of subsurface layers of metallic materials to improve the service characteristics of machine components and tools. The aim of this work was the experimental examination of the 'long-range effect' in coarse-grain copper in high-dose ion implantation. In this method, special attention is given to the preparation of specimens both for the case and for the examination by the method of electron microscopy and also to the ion implantation conditions

  17. Immediate CAD/ CAM Custom Fabricated Dental Implants

    OpenAIRE

    Jafar Kolahi; Ali Aghababagoli; Ahmad Soolari

    2010-01-01

    Introduction: There will almost always be gaps between cylin-drical or screw shaped prefabricated implant surface and funnel-shaped tooth socket when an implant is placed immediately after tooth extraction. Hence expensive and difficult bone grafting is re-quired. A custom fabricated implant will be a pragmatic solution for this limitation.The hypothesis: First step following extraction of a tooth is data capture or scanning via a 3D scan method e.g. coordinate measuring machine or non-contac...

  18. Batteries used to power implantable biomedical devices

    International Nuclear Information System (INIS)

    Battery systems have been developed that provide years of service for implantable medical devices. The primary systems utilize lithium metal anodes with cathode systems including iodine, manganese oxide, carbon monofluoride, silver vanadium oxide and hybrid cathodes. Secondary lithium ion batteries have also been developed for medical applications where the batteries are charged while remaining implanted. While the specific performance requirements of the devices vary, some general requirements are common. These include high safety, reliability and volumetric energy density, long service life, and state of discharge indication. Successful development and implementation of these battery types has helped enable implanted biomedical devices and their treatment of human disease.

  19. Batteries used to Power Implantable Biomedical Devices

    Science.gov (United States)

    Bock, David C.; Marschilok, Amy C.; Takeuchi, Kenneth J.; Takeuchi, Esther S.

    2012-01-01

    Battery systems have been developed that provide years of service for implantable medical devices. The primary systems utilize lithium metal anodes with cathode systems including iodine, manganese oxide, carbon monofluoride, silver vanadium oxide and hybrid cathodes. Secondary lithium ion batteries have also been developed for medical applications where the batteries are charged while remaining implanted. While the specific performance requirements of the devices vary, some general requirements are common. These include high safety, reliability and volumetric energy density, long service life, and state of discharge indication. Successful development and implementation of these battery types has helped enable implanted biomedical devices and their treatment of human disease. PMID:24179249

  20. Batteries used to Power Implantable Biomedical Devices.

    Science.gov (United States)

    Bock, David C; Marschilok, Amy C; Takeuchi, Kenneth J; Takeuchi, Esther S

    2012-12-01

    Battery systems have been developed that provide years of service for implantable medical devices. The primary systems utilize lithium metal anodes with cathode systems including iodine, manganese oxide, carbon monofluoride, silver vanadium oxide and hybrid cathodes. Secondary lithium ion batteries have also been developed for medical applications where the batteries are charged while remaining implanted. While the specific performance requirements of the devices vary, some general requirements are common. These include high safety, reliability and volumetric energy density, long service life, and state of discharge indication. Successful development and implementation of these battery types has helped enable implanted biomedical devices and their treatment of human disease.

  1. Radiographic examination for successful dental implant

    International Nuclear Information System (INIS)

    Recently implant has become an important field in dental clinic. Radiographic examination of pre- and post-operation is essential for successful treatment. Clinicians should have knowledge about the purpose of the radiographic examination, suitable imaging modality for the cases, anatomic landmarks of tooth and jaw bone, advantage and limitation of panoramic radiographic examination for implant, principle and interpretation of cross-sectional imaging, bone mineral density, post-operative radiographic examination. This paper will be helpful to get above information for dentists who want to do dental implant successfully.

  2. Fabrication of Implanted $^{22}$Na Targets

    CERN Multimedia

    2002-01-01

    A knowledge of the $^{22}$Na(p,$\\gamma$)$^{23}$ Mg reaction rate is of significant astrophysical interest. In order to complete previous studies of this reaction, radioactive $^{22}$Na targets of high purity are required. We ask for support to fabricate these targets via the implantation technique at ISOLDE GPS (off—line mode) using $^{22}$Na nuclides in an Al matrix produced in Nov. 1990 at the PSI (Zürich). The $^{22}$Na nuclides are released and ionized in a surface ionisation source, mass-analyzed at ISOLDE GPS, and implanted in a Ni-Ta backing and a C—foil in a special implantation setup.

  3. Living with an implantable cardioverter defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S; Knudsen, Charlotte; Dilling, Karen;

    2016-01-01

    AIMS: The clinical management and care of patients with an implantable cardioverter defibrillator (ICD) has shifted from face-to-face in-clinic visits to remote monitoring. Reduced interactions between patients and healthcare professionals may impede patients' transition to adapting post......-implant. We examined patients' needs and preferences for information provision and care options and overall satisfaction with treatment. METHODS AND RESULTS: Patients implanted with a first-time ICD or defibrillator with cardiac resynchronization therapy (n = 389) within the last 2 years at Odense University...

  4. Prevalence of Peri-Implant Mucositis and Peri-Implantitis in Patients Treated with a Combination of Axial and Tilted Implants Supporting a Complete Fixed Denture

    Science.gov (United States)

    Cavalli, Nicolò; Taschieri, Silvio; Francetti, Luca

    2015-01-01

    Objectives. The aim of this retrospective study was to assess the incidence and prevalence of peri-implant mucositis and peri-implantitis in patients with a fixed full-arch prosthesis supported by two axial and two tilted implants. Materials and Methods. Sixty-nine patients were included in the study. Each patient received a fixed full-arch prosthesis supported by two mesial axial and two distal tilted implants to rehabilitate the upper arch, the lower arch, or both. Three hundred thirty-six implants for 84 restorations were delivered. Patients were scheduled for follow-up visits every 6 months in the first 2 years and yearly after. At each follow-up visit peri-implant mucositis and peri-implantitis were diagnosed if present. Results. The overall follow-up range was from 12 to 130 months (mean 63,2 months). Three patients presented peri-implantitis. The prevalence of peri-implant mucositis ranged between 0 and 7,14% of patients (5,06% of implants) while the prevalence of peri-implantitis varied from 0 to 4,55% of patients (3,81% of implants). Conclusions. The prevalence and incidence of peri-implant mucositis and peri-implantitis are lower than most of the studies in literature. Therefore this kind of rehabilitation could be considered a feasible option, on the condition of adopting a systematic hygienic protocol. PMID:26065029

  5. Prevalence of Peri-Implant Mucositis and Peri-Implantitis in Patients Treated with a Combination of Axial and Tilted Implants Supporting a Complete Fixed Denture

    Directory of Open Access Journals (Sweden)

    Nicolò Cavalli

    2015-01-01

    Full Text Available Objectives. The aim of this retrospective study was to assess the incidence and prevalence of peri-implant mucositis and peri-implantitis in patients with a fixed full-arch prosthesis supported by two axial and two tilted implants. Materials and Methods. Sixty-nine patients were included in the study. Each patient received a fixed full-arch prosthesis supported by two mesial axial and two distal tilted implants to rehabilitate the upper arch, the lower arch, or both. Three hundred thirty-six implants for 84 restorations were delivered. Patients were scheduled for follow-up visits every 6 months in the first 2 years and yearly after. At each follow-up visit peri-implant mucositis and peri-implantitis were diagnosed if present. Results. The overall follow-up range was from 12 to 130 months (mean 63,2 months. Three patients presented peri-implantitis. The prevalence of peri-implant mucositis ranged between 0 and 7,14% of patients (5,06% of implants while the prevalence of peri-implantitis varied from 0 to 4,55% of patients (3,81% of implants. Conclusions. The prevalence and incidence of peri-implant mucositis and peri-implantitis are lower than most of the studies in literature. Therefore this kind of rehabilitation could be considered a feasible option, on the condition of adopting a systematic hygienic protocol.

  6. Fractura triple del complejo suspensorio del hombro

    Directory of Open Access Journals (Sweden)

    Eraclio Delgado Rifá

    2015-06-01

    Full Text Available El complejo suspensorio del hombro es una estructura sumamente importante, compuesta por un anillo de huesos y tejidos blandos. Las lesiones aisladas de este complejo anatómico son frecuentes y no afectan su estabilidad. La interrupción doble conduce a la inestabilidad de esta estructura y usualmente requiere tratamiento quirúrgico. La triple interrupción, por su parte, es sumamente rara y es encontrada en casos de trauma de alta energía a menudo en asociación con otras lesiones. Se presenta una triple lesión del complejo suspensorio del hombro en un paciente de 46 años de edad, con una fractura de la glenoides, del acromion tipo III de Kuhn y de la coracoides tipo II de Ogawa. En este caso, la fractura del acromion fue tratada con fijación percutánea con alambres de Kirschner, por tener asociado lesiones de partes blandas que contraindicaron la reducción abierta. La fractura de la glenoides y de la apófisis coracoides fueron tratadas conservadoramente. Después de 6 meses de evolución, el paciente tuvo un resultado funcional aceptable, con una abducción de 90 grados, los 30 grados de rotación externa y 70 de rotación interna, además asintomático y consolidación de todas las fracturas. A pesar de ser catalogada de una lesión grave del cinturón escapular y estar asociada a otras lesiones se obtuvo un resultado satisfactorio al final del tratamiento.

  7. Estudio de asociación entre enfermedades sistémicas y el fracaso de implantes dentales Study of association between systemic diseases and dental implant failure

    Directory of Open Access Journals (Sweden)

    J Domínguez

    2013-04-01

    Full Text Available Desde los inicios de la cirugía de implantes orales, se ha recomendado excluir o limitar a ciertos pacientes con problemas de salud o hábitos de tabaquismo. Los enfermedades crónicas no transmisibles de salud, no son considerados una contraindicación absoluta para la utilización de implantes orales, pero si se debe evaluar con detalle el tipo de enfermedad presente, por ser un potencial riesgo que podría afectar el proceso de oseointegración. Hay ciertas condiciones sistémicas, como la osteoporosis, enfermedades cardiovasculares, diabetes mellitus, e hipotiroidismo, así como también, el hábito de fumar, que inciden sobre el éxito, la sobrevida o el fracaso de los implantes. El propósito de la investigación realizada, es determinar si existe asociación entre los fracasos de los implantes dentales y las enfermedades sistémicas en la población de pacientes sometidos a cirugía de implantes dentales del hospital San José de Santiago de Chile. Se realizó un estudio de tipo observacional de carácter retrospectivo y las variables estudiadas fueron las enfermedades sistémicas (osteoporosis, hipertensión, diabetes, e hipotiroidismo y los criterios utilizados para la evaluación de salud de implantes fueron los del Congreso Internacional de Implantología Oral de Pisa, en donde fracaso es el término usado para los implantes que requieren el retiro o ya se han perdido. Estas variables se registraron desde la ficha clínica y durante un examen clínico, en una ficha de recolección de datos. Esto permitió, describir variables y su distribución, posteriormente analizar los datos obtenidos encontrando evidencias de asociación estadísticamente válidas. Para este estudio podemos concluir, que el análisis de cada una de las variables sistémicas como son la hipertensión, clasificación ASA II, presentan una asociación con el fracaso de implantes dentales, no así la osteoporosis, hipotiroidismo, diabetes, edad, estado nutricional

  8. Marketing Mix del Software.

    OpenAIRE

    Yudith del Carmen Rodríguez Pérez

    2006-01-01

    La ingeniería del software y los modelos de calidad del software han consolidado sus esfuerzos en el proceso de producción del mismo, sin embargo son pocos sus aportes en el proceso de comercialización. Es esencial en la ciencia de la computación desarrollar un modelo de comercialización para las organizaciones productoras de software con el fin de elevar la productividad de las mismas. Sin embargo, es preciso primero conocer las características del producto software que los diferencian de ot...

  9. Rehabilitación mediante implantes de carga inmediata con regeneración ósea

    Directory of Open Access Journals (Sweden)

    René Abel Salso Morell

    2015-12-01

    Full Text Available La disponibilidad ósea es uno de los principales elementos a tener en cuenta en la planificación del tratamiento implantológico. La posibilidad de optar por este se encuentra limitada en pacientes con déficit óseo, tanto en cantidad, como en calidad. La regeneración ósea guiada es una técnica quirúrgica, que permite estimular la formación de hueso en zonas específicas, permitiendo una disponibilidad adecuada del mismo, facilitando así esta terapéutica. Pueden realizarse previamente a la colocación de los implantes o durante la colocación de los mismos. Se presenta un caso de rehabilitación protésica por medio de implantes de carga inmediata utilizando una técnica de regeneración ósea, guiada  en el momento de la implantación. Se realizó seguimiento por seis meses, constatándose la integración del implante, así como la adecuada adaptación de la rehabilitación protésica.

  10. La carga precoz de los implantes GMI con conexión interna y superficie arenada y grabada

    Directory of Open Access Journals (Sweden)

    E. Velasco Ortega

    2014-08-01

    Full Text Available Introducción: La implantología oral representa en la actualidad, una modalidad terapéutica odontológica en los pacientes con pérdida dental total y parcial. El estudio muestra la evaluación de los pacientes tratados mediante carga precoz de implantes de titanio con conexión interna y superficie arenada y grabada. Métodos: 39 pacientes con pérdidas dentales fueron tratados con implantes con conexión interna y superficie arenada y grabada Frontier GMI®. Los implantes fueron cargados funcionalmente tras un periodo de tiempo de 6 semanas en la mandíbula y 8 semanas en el maxilar superior. Los hallazgos clínicos (implantológicos y prostodóncicos se han seguido durante 1 año. Resultados: 111 implantes fueron insertados en ambos maxilares (50 en el maxilar superior y 61 en la mandíbula para su rehabilitación prostodóncica. 44 implantes fueron insertados en el sector anterior y 67 implantes en el sector posterior. Después de 1 año de seguimiento clínico, los resultados indican una supervivencia y éxito de los implantes del 99,1%. Durante el periodo de cicatrización libre de carga funcional, se perdió 1 implante por movilidad. Como complicaciones tardías hubo un caso de periimplantitis. Las restauraciones prostodóncicas incluyeron 30 coronas unitarias, 15 puentes fijos, 5 sobredentaduras con bolas y 2 rehabilitaciones totales fijas. Conclusiones: Los hallazgos clínicos del presente estudio indican que la rehabilitación prostodóncica mediante la inserción de implantes de titanio con conexión interna y superficie arenada + grabada, y cargados precozmente, representa una terapéutica odontológica con éxito elevado.

  11. Radiation treatment of the ceramic and polymer implants

    Science.gov (United States)

    Korobeynikov, M. V.; Bryazgin, A. A.; Bezuglov, V. V.; Shtarklev, E. A.; Vlasov, A. Yu; Voronin, L. A.; Tkachenko, V. O.

    2016-02-01

    Implants are used in medical practice during decades. The ceramic implants are the new trend in medicine. The polymer implants are used for many years, and they are mainly sterilized by the radiation treatment. The article describes the new ceramic and polymer implants that were treated in the Budker Institute of Nuclear Physics.

  12. 21 CFR 886.3320 - Eye sphere implant.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Eye sphere implant. 886.3320 Section 886.3320 Food... DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3320 Eye sphere implant. (a) Identification. An eye sphere implant is a device intended to be implanted in the eyeball to occupy space following the...

  13. 21 CFR 876.3630 - Penile rigidity implant.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Penile rigidity implant. 876.3630 Section 876.3630...) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Prosthetic Devices § 876.3630 Penile rigidity implant. (a) Identification. A penile rigidity implant is a device that consists of a pair of semi-rigid rods implanted in...

  14. 21 CFR 886.3340 - Extraocular orbital implant.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Extraocular orbital implant. 886.3340 Section 886...) MEDICAL DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3340 Extraocular orbital implant. (a) Identification. An extraocular orbital implant is a nonabsorbable device intended to be implanted during...

  15. Magnetic resonance imaging of trilucent TM breast implants

    International Nuclear Information System (INIS)

    AIM: To demonstrate the magnetic resonance imaging (MRI) appearances of intact and ruptured Trilucent TM implants with imaging and surgical correlation. The appearances of the implant transponder artefact are also described MATERIALS AND METHODS: A retrospective review of the MRI findings in 34 patients with bilateral subpectoral Trilucent TM breast implants (Lipomatrix, Inc./Collagen Aesthetics International Inc., Neuchatel, Switzerland) was performed. Patients under implant surveillance and those with suspected implant rupture formed the study group. Imaging findings were correlated with surgical appearances. RESULTS: Surgical correlation was available in 53% of patients. Fifty per cent (18/36) of implants were intact at surgery, 50% (18/36) of implants were ruptured. Of the 18 ruptured implants, 17 were intracapsular ruptures and one an extracapsular rupture. The sensitivity of MRI for detection of intracapsular rupture in Trilucent TM breast implants was 82% specificity 76%, positive predictive value 78%, negative predictive value 81% and accuracy 79% in this study group. No case of implant rupture was obscured by the transponder artefact. Four implants were found to have 'pseudocapsules' at surgery (5·9%), the implants were intact with fluid present between the implant and capsule. Only one pseudocapsule was demonstrated on MRI. CONCLUSION: Magnetic resonance imaging is currently the most accurate technique for diagnosis of implant rupture in Trilucent TM breast implants. Transponder artefact does not appear to interfere with the assessment of implant rupture. Elson, E. M. et al. (2002)

  16. Tissue response: biomaterials, dental implants, and compromised osseous tissue.

    Science.gov (United States)

    Babu RS, Arvind; Ogle, Orrett

    2015-04-01

    Tissue response represents an important feature in biocompatibility in implant procedures. This review article highlights the fundamental characteristics of tissue response after the implant procedure. This article also highlights the tissue response in compromised osseous conditions. Understanding the histologic events after dental implants in normal and abnormal bone reinforces the concept of case selection in dental implants.

  17. 21 CFR 882.4545 - Shunt system implantation instrument.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Shunt system implantation instrument. 882.4545... implantation instrument. (a) Identification. A shunt system implantation instrument is an instrument used in the implantation of cerebrospinal fluid shunts, and includes tunneling instruments for passing...

  18. Particle migration and gap healing around trabecular metal implants

    DEFF Research Database (Denmark)

    Rahbek, O; Kold, S; Zippor, B;

    2005-01-01

    Bone on-growth and peri-implant migration of polyethylene particles were studied in an experimental setting using trabecular metal and solid metal implants. Cylindrical implants of trabecular tantalum metal and solid titanium alloy implants with a glass bead blasted surface were inserted either...

  19. Investigations of silicone breast implants with the NMR-MOUSE.

    Science.gov (United States)

    Krüger, Mirko; Schwarz, Annett; Blümich, Bernhard

    2007-02-01

    Silicone breast implants are used for breast augmentation and breast reconstruction. The issues of concern associated with such implants are: (a) the quality control of each implant before implantation, and (b) the detection of implant bleeding after implantation. We have studied the use of the Nuclear Magnetic Resonance-MObile Universal Surface Explorer (NMR-MOUSE) for the nondestructive testing of (a) the quality of implant shells, and (b) changes in implant gel due to leakage of body fluid into the implant. Depth profiles measured nondestructively through implant shells at different positions of each implant by the Profile NMR-MOUSE assured good reproducibility of the quality and thickness of different shell layers. The leakage of implants upon rupture was mimicked by observing changes in the transverse NMR relaxation time of the implant gel upon ingress of physiological saline solution and safflower oil through the rupture. Results demonstrate that nondestructive testing with unilateral NMR is a potential method for use in the quality control of implants and for the screening of implants for rupture after implantation. PMID:17275616

  20. Silicone Breast Implant and Automatic Implantable Cardioverter Defibrillator: Can They Coexist? A Case Report

    Science.gov (United States)

    Arik, Zaretski

    2016-01-01

    Summary: We present a case of a silicone breast implant rupture after insertion of an automatic implantable cardioverter defibrillator (AICD). A 51-year-old woman presented to our plastic surgery clinic to exchange her silicone breast implants. The patient underwent cosmetic mastopexy and breast augmentation in 2008. Because of recurrent myocardial infarctions and chronic heart failure, she underwent an insertion of an AICD in 2014 in which the left breast implant was hit. In this report, we discuss the first case of an AICD insertion, disrupting a breast implant. This case report illustrates the rare but real possibility of breast implant rupture after even minor surgical manipulation of the breast area. PMID:27622117

  1. Effects of Implantation Sequence on the Micro-defects in H and O Implanted Silicon

    Science.gov (United States)

    Wang, Zhuo; Yang, Lin; Zhang, Li-Zhu; Shi, Shao-Bo; Zhang, Peng; Cao, Xing-Zhong; Wang, Bao-Yi

    2016-06-01

    Cz n-type Si (100) wafers are implanted with 190 keV O and 40 keV H ions in different implantation sequences. Cross sectional transmission electron microscopy and slow positron annihilation spectroscopy are used to study the formation and evolution of micro-defects. Our results clearly show that the defect morphology depends strongly on the implantation sequence. Large cavities are observed in O preimplanted samples, while only platelets are observed in H preimplanted samples. The change regularity of the S parameter is the same for the Si samples co-implanted at different sequences. But in H preimplanted samples, the S parameter is a little higher. The effects of the implantation sequence on the micro-defects have been discussed in combination with H and O implantation-induced defects as well as their interactions upon annealing.

  2. Estudio del léxico del Ecuador

    OpenAIRE

    Estrella Santos, Ana Teresa

    2008-01-01

    El presente trabajo de investigación pretende proporcionar una descripción del léxico del español del Ecuador, a partir de materiales de la lengua hablada. Hemos llevado a cabo un análisis contrastivo del léxico de las provincias de Pichincha y Guayas, una recopilación del léxico general del Ecuador y un análisis de los quichuismos presentes en nuestro corpus.

  3. Semiconductor applications of plasma immersion ion implantation technology

    Indian Academy of Sciences (India)

    Mukesh Kumar; Rajkumar; Dinesh Kumar; P J George

    2002-11-01

    Many semiconductor integrated circuit manufacturing processes require high dose of implantation at very low energies. Conventional beam line ion implantation system suffers from low beam current at low energies, therefore, cannot be used economically for high dose applications. Plasma immersion ion implantation (PIII) is emerging as a potential technique for such implantations. This method offers high dose rate irrespective of implantation energy. In the present study nitrogen ions were implanted using PIII in order to modify the properties of silicon and some refractory metal films. Oxidation behaviour of silicon was observed for different implantation doses. Diffusion barrier properties of refractory barrier metals were studied for copper metallization.

  4. Chimeric Peptides as Implant Functionalization Agents for Titanium Alloy Implants with Antimicrobial Properties

    Science.gov (United States)

    Yucesoy, Deniz T.; Hnilova, Marketa; Boone, Kyle; Arnold, Paul M.; Snead, Malcolm L.; Tamerler, Candan

    2015-04-01

    Implant-associated infections can have severe effects on the longevity of implant devices and they also represent a major cause of implant failures. Treating these infections associated with implants by antibiotics is not always an effective strategy due to poor penetration rates of antibiotics into biofilms. Additionally, emerging antibiotic resistance poses serious concerns. There is an urge to develop effective antibacterial surfaces that prevent bacterial adhesion and proliferation. A novel class of bacterial therapeutic agents, known as antimicrobial peptides (AMPs), are receiving increasing attention as an unconventional option to treat septic infection, partly due to their capacity to stimulate innate immune responses and for the difficulty of microorganisms to develop resistance towards them. While host and bacterial cells compete in determining the ultimate fate of the implant, functionalization of implant surfaces with AMPs can shift the balance and prevent implant infections. In the present study, we developed a novel chimeric peptide to functionalize the implant material surface. The chimeric peptide simultaneously presents two functionalities, with one domain binding to a titanium alloy implant surface through a titanium-binding domain while the other domain displays an antimicrobial property. This approach gains strength through control over the bio-material interfaces, a property built upon molecular recognition and self-assembly through a titanium alloy binding domain in the chimeric peptide. The efficiency of chimeric peptide both in-solution and absorbed onto titanium alloy surface was evaluated in vitro against three common human host infectious bacteria, Streptococcus mutans, Staphylococcus epidermidis, and Escherichia coli. In biological interactions such as occur on implants, it is the surface and the interface that dictate the ultimate outcome. Controlling the implant surface by creating an interface composed chimeric peptides may therefore

  5. LA POLITICA SOCIAL DEL "GOBIERNO DEL CAMBIO"

    Directory of Open Access Journals (Sweden)

    Laura Mota Díaz

    2002-01-01

    Full Text Available El artículo se centra en la política social del actual sexenio foxista , la cual se ha definido como incluyente y equitativa dentro del marco de un gobierno autodenominado del cambio, no sólo por lo que se refiere a la alternancia política del poder, sino porque además pretende ser un gobierno con una visión más amplia del desarrollo. Todo ello se traduce en “nuevas” estrategias para alcanzar la democracia, la equidad, la justicia social y el bienestar general de la población. El objetivo es analizar las posibilidades y limitaciones de un verdadero cambio que contribuya a mejorar la calidad de vida de la población en su sentido más amplio, pues los retos son cada vez mayores dado el incremento en los niveles de pobreza, el creciente desempleo y la constante violación a los derechos humanos.

  6. Periodontal and peri-implant diseases: identical or fraternal infections?

    Science.gov (United States)

    Robitaille, N; Reed, D N; Walters, J D; Kumar, P S

    2016-08-01

    Peri-implant diseases (peri-implantitis and peri-implant mucositis) are bacterially driven infections. Peri-implantitis leads to aggressive bone resorption and eventual loss of the implant. Traditionally, peri-implantitis was regarded as microbially similar to periodontitis, and translocation of periodontal pathogens into the peri-implant crevice was considered as a critical factor in disease causation. However, evidence is emerging to suggest that the peri-implant and periodontal ecosystems differ in many important ways. The purpose of this review is to examine the evidence supporting microbial congruence and discordance in these two communities. Current evidence suggests that osseointegrated implants truly create unique microenvironments that force microbial adaptation and selection. Further studies that revisit the "microbial reservoir" hypothesis and identify species that play an etiologic role in peri-implant disease and examine their transmission from teeth are needed. PMID:26255984

  7. DENTAL IMPLANTS: AS AN ALTERNATIVE FOR TOOTH REPLACEMENT

    Directory of Open Access Journals (Sweden)

    Banerjee Nandini

    2013-08-01

    Full Text Available A dental implant is an artificial tooth that replaces a tooth that has been taken out. Implants are natural-looking, can provide support for dentures and do not affect the teeth bordering them. They are as stable as your real teeth and protect you from the loss of jawbone, which occurs when you lose teeth. Endosseous dental implants have revolutionized the fields of implants and periodontics. During the last decade, a great deal of information has been generated concerning the effectiveness and predictability of endosseous implants. Implant placement is a viable option in the treatment of partial and full edentulism and has become an integral facet of periodontal therapy. The available implants are remarkably successful. This review discusses the different aspects of dental implant including its advantages over the contemporary removable implants, its procedure in detail and the financial outlook of the same. The review also has a small consideration on minidental implant.

  8. Bone-Implant Contact around Crestal and Subcrestal Dental Implants Submitted to Immediate and Conventional Loading

    Directory of Open Access Journals (Sweden)

    Ana Emília Farias Pontes

    2014-01-01

    Full Text Available The present study aims to evaluate the influence of apicocoronal position and immediate and conventional loading in the percentage of bone-implant contact (BIC. Thus, 36 implants were inserted in the edentulous mandible from six dogs. Three implants were installed in each hemimandible, in different positions in relation to the ridge: Bone Level (at crestal bone level, Minus 1 (one millimeter apical to crestal bone, and Minus 2 (two millimeters apical to crestal bone. In addition, each hemimandible was submitted to a loading protocol: immediate (prosthesis installed 24 hours after implantation or conventional (prosthesis installed 120 days after implantation. Ninety days after, animals were killed, and implant and adjacent tissues were prepared for histometric analysis. BIC values from immediate loaded implants were 58.7%, 57.7%, and 51.1%, respectively, while conventional loaded implants were 61.8%, 53.8%, and 68.4%. Differences statistically significant were not observed among groups (P=0.10, ANOVA test. These findings suggest that different apicocoronal positioning and loading protocols evaluated did not interfere in the percentage of bone-implant contact, suggesting that these procedures did not jeopardize osseointegration.

  9. Micro-cutting of silicon implanted with hydrogen and post-implantation thermal treatment

    Science.gov (United States)

    Jelenković, Emil V.; To, Suet; Sundaravel, B.; Xiao, Gaobo; Huang, Hu

    2016-07-01

    It was reported that non-amorphizing implantation by hydrogen has a potential in improving silicon machining. Post-implantation high-temperature treatment will affect implantation-induced damage, which can have impact on silicon machining. In this article, a relation of a thermal annealing of hydrogen implanted in silicon to micro-cutting experiment is investigated. Hydrogen ions were implanted into 4″ silicon wafers with 175 keV, 150 keV, 125 keV and doses of 2 × 1016 cm-2, 2 × 1016 cm-2 and 3 × 1016 cm-2, respectively. In this way, low hydrogen atom-low defect concentration was created in the region less than ~0.8 μm deep and high hydrogen atom-high defect concentration was obtained at silicon depth of ~0.8-1.5 μm. The post-implantation annealing was carried out at 300 and 400 °C in nitrogen for 1 h. Physical and electrical properties of implanted and annealed samples were characterized by secondary ion mass spectroscopy (SIMS), X-ray diffraction (XRD), Rutherford backscattering (RBS) and nanoindentation. Plunge cutting experiment was carried out in and silicon crystal direction. The critical depth of cut and cutting force were monitored and found to be influenced by the annealing. The limits of hydrogen implantation annealing contribution to the cutting characteristics of silicon are discussed in light of implantation process and redistribution of hydrogen and defects generation during annealing process.

  10. Extraocular Surgical Approach for Placement of Subretinal Implants in Blind Patients: Lessons from Cochlear-Implants

    Directory of Open Access Journals (Sweden)

    Assen Koitschev

    2015-01-01

    Full Text Available In hereditary retinal diseases photoreceptors progressively degenerate, often causing blindness without therapy being available. Newly developed subretinal implants can substitute functions of photoreceptors. Retina implant extraocular surgical technique relies strongly on cochlear-implant know-how. However, a completely new surgical approach providing safe handling of the photosensor array had to be developed. The Retina Implant Alpha IMS consisting of a subretinal microphotodiode array and cable linked to a cochlear-implant-like ceramic housing was introduced via a retroauricular incision through a subperiosteal tunnel above the zygoma into the orbit using a specially designed trocar. Implant housing was fixed in a bony bed within a tight subperiosteal pocket in all patients. Primary outcomes were patient short term safety as well as effectiveness. Nine patients participated in the first part of the multicenter trial and received the subretinal visual implant in one eye. In all cases microphotodiode array pull-through procedure and stable positioning were possible without affecting the device function. No intraoperative complications were encountered. The minimally invasive suprazygomatic tunneling technique for the sensor unit as well as a subperiosteal pocket fixation of the implant housing provides a safe extraocular implantation approach of a subretinal device with a transcutaneous extracorporeal power supply.

  11. Extraocular Surgical Approach for Placement of Subretinal Implants in Blind Patients: Lessons from Cochlear-Implants.

    Science.gov (United States)

    Koitschev, Assen; Stingl, Katarina; Bartz-Schmidt, Karl Ulrich; Braun, Angelika; Gekeler, Florian; Greppmaier, Udo; Sachs, Helmut; Peters, Tobias; Wilhelm, Barbara; Zrenner, Eberhart; Besch, Dorothea

    2015-01-01

    In hereditary retinal diseases photoreceptors progressively degenerate, often causing blindness without therapy being available. Newly developed subretinal implants can substitute functions of photoreceptors. Retina implant extraocular surgical technique relies strongly on cochlear-implant know-how. However, a completely new surgical approach providing safe handling of the photosensor array had to be developed. The Retina Implant Alpha IMS consisting of a subretinal microphotodiode array and cable linked to a cochlear-implant-like ceramic housing was introduced via a retroauricular incision through a subperiosteal tunnel above the zygoma into the orbit using a specially designed trocar. Implant housing was fixed in a bony bed within a tight subperiosteal pocket in all patients. Primary outcomes were patient short term safety as well as effectiveness. Nine patients participated in the first part of the multicenter trial and received the subretinal visual implant in one eye. In all cases microphotodiode array pull-through procedure and stable positioning were possible without affecting the device function. No intraoperative complications were encountered. The minimally invasive suprazygomatic tunneling technique for the sensor unit as well as a subperiosteal pocket fixation of the implant housing provides a safe extraocular implantation approach of a subretinal device with a transcutaneous extracorporeal power supply. PMID:26783453

  12. Extraocular Surgical Approach for Placement of Subretinal Implants in Blind Patients: Lessons from Cochlear-Implants

    Science.gov (United States)

    Koitschev, Assen; Stingl, Katarina; Bartz-Schmidt, Karl Ulrich; Braun, Angelika; Gekeler, Florian; Greppmaier, Udo; Sachs, Helmut; Peters, Tobias; Wilhelm, Barbara; Zrenner, Eberhart; Besch, Dorothea

    2015-01-01

    In hereditary retinal diseases photoreceptors progressively degenerate, often causing blindness without therapy being available. Newly developed subretinal implants can substitute functions of photoreceptors. Retina implant extraocular surgical technique relies strongly on cochlear-implant know-how. However, a completely new surgical approach providing safe handling of the photosensor array had to be developed. The Retina Implant Alpha IMS consisting of a subretinal microphotodiode array and cable linked to a cochlear-implant-like ceramic housing was introduced via a retroauricular incision through a subperiosteal tunnel above the zygoma into the orbit using a specially designed trocar. Implant housing was fixed in a bony bed within a tight subperiosteal pocket in all patients. Primary outcomes were patient short term safety as well as effectiveness. Nine patients participated in the first part of the multicenter trial and received the subretinal visual implant in one eye. In all cases microphotodiode array pull-through procedure and stable positioning were possible without affecting the device function. No intraoperative complications were encountered. The minimally invasive suprazygomatic tunneling technique for the sensor unit as well as a subperiosteal pocket fixation of the implant housing provides a safe extraocular implantation approach of a subretinal device with a transcutaneous extracorporeal power supply. PMID:26783453

  13. Dental student perceptions of predoctoral implant education and plans for providing implant treatment.

    Science.gov (United States)

    Yuan, Judy Chia-Chun; Kaste, Linda M; Lee, Damian J; Harlow, Rand F; Knoernschild, Kent L; Campbell, Stephen D; Sukotjo, Cortino

    2011-06-01

    This study aims to identify dental students' perceptions of pre-patient care laboratory exercises (PCLEs) and clinical experiences that influence their future plans for providing implant care. One of two questionnaires was administered to dental student classes at one dental school (D2: Survey 1; D3 and D4: Survey 2). Future plans as graduates to provide implant diagnosis and treatment planning (DxTP), restoration of single-tooth implants (STIs), and implant-retained overdentures (IODs) were cross-sectionally assessed along with potential influences such as PCLE, clinical experiences, gender, and class. The majority of students planned to provide implant services after graduation (DxTP 68.9 percent; STI 61.2 percent; IOD 62.1 percent). Bivariately, males reflected more preparedness from PCLEs than females (p=.002) and the D2 students more than D3 and D4 students (ppreparedness from PCLEs generally had the strongest association with future plans for performing implant therapy. However, this varied by gender and class. These findings indicate that PCLEs are important for their influence on students' future plans to provide implant therapy. However, further studies are needed to validate actual PCLEs and clinical implant practices (both longitudinally and for other schools) and to determine educational interventions to optimize the provision of implant care. PMID:21642520

  14. Treatment of peri-implantitis: surgical therapeutic approaches based on peri-implantitis defects.

    Science.gov (United States)

    Parma-Benfenati, Stefano; Roncati, Marisa; Tinti, Carlo

    2013-01-01

    Peri-implantitis is a frequently occurring inflammatory disease mediated by bacterial infection that results in the loss of supporting bone. Peri-implantitis should be treated immediately, but there is a lack of evidence regarding the most effective therapeutic interventions. Nonsurgical periodontics may be the treatment of choice in cases of peri-implant mucositis or if the patient has medical contraindications or refuses to consent to more appropriate treatment. Peri-implantitis defects will dictate the therapeutic approach and present a guideline for relative clinical management. The suggested therapeutic solutions are derived from clinical experience and are meant to be a useful guide.

  15. Correlation between implantation defects and dopants in Fe-implanted SiC

    Energy Technology Data Exchange (ETDEWEB)

    Declemy, A.; Dupeyrat, C.; Eyidi, D. [CNRS, Universite de Poitiers, ENSMA, Departement de Physique et Mecanique des Materiaux, Futuroscope-Chasseneuil (France); Debelle, A.; Thome, L. [Univ. Paris-Sud, CNRS-IN2P3, Centre de spectrometrie Nucleaire et de Spectrometrie de Masse (CSNSM), Orsay (France); Monnet, I. [CEA-CNRS-ENSICAEN, Centre de Recherche sur les Materiaux, les Ions et la Photonique (CIMAP), Caen (France)

    2012-03-15

    SiC single crystals were implanted with Fe ions and the effects of implantation temperature, Fe concentration, and subsequent swift heavy ion irradiation on both dopant and damage depth distributions were evaluated by using RBS and channelling techniques. It is found that an increase of the implantation temperature above the threshold temperature for amorphization can lead to the formation of a broad layer ({proportional_to}50 nm) containing a large concentration of implanted Fe atoms ({proportional_to}2 at.%) but almost free of implantation defects. This particular configuration is likely due to dynamic annealing during implantation combined with defect annihilation at the surface. It is only observed when the implanted species concentration does not exceed a critical value (which lies between 2 and 5 at.% in the present system). Post-implantation swift heavy ion irradiation leads to a further decrease of the damage level, while the Fe distribution is not affected. The Fe substitutional fraction has been evaluated in the different tested conditions. A maximum value of {proportional_to}50% is found when implantation is performed at the temperature above that required to prevent amorphization (470 K in the present system). Swift-heavy ion irradiation seems to induce Fe atoms relocation at substitutional positions. (orig.)

  16. Effects of Dental Implant-abutment Interfaces on the Reliability of Implant Systems

    Directory of Open Access Journals (Sweden)

    Zhang Xiao

    2016-01-01

    Full Text Available In this paper, by analyzing the effects of two different kinds of implant-abutment connection interfaces under the same working condition on the mechanical and fatigue performances of the implant system as well as on the surrounding bones, we intend to study such effects on the reliability of the implants and provide a theoretical basis for the design and clinical application of dental implant systems. For the purpose, we adopt a 3-D modeling method to establish the model, and use FEA (finite element analysis to carry out static mechanic and fatigue analysis on the implant system and its surrounding bones; then we make the two implant systems, and carry out fatigue tests on a dynamic fatigue testing machine to verify the FEA results. After comparing the results from the two different systems, we find that the stress distribution and fatigue safety factor of the system which has deeper axial matching of the taper connection are better than those of the other system, that is to say, between the two major elements of a implant system, the axial length of the connecting taper and the size of the hexagon, the former has greater effects than the latter. When the axial matching is deeper, the stress distribution of the implant system will be better, the fatigue safety factor will be higher, and the implant system will be more reliable.

  17. Biodegradable radioactive implants for glaucoma filtering surgery produced by ion implantation

    Energy Technology Data Exchange (ETDEWEB)

    Assmann, W. [Department fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, 85748 Garching (Germany)]. E-mail: walter.assmann@lmu.de; Schubert, M. [Department fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, 85748 Garching (Germany); Held, A. [Augenklinik, Technische Universitaet Muenchen, 81675 Munich (Germany); Pichler, A. [Augenklinik, Technische Universitaet Muenchen, 81675 Muenchen (Germany); Chill, A. [Zentralinstitut fuer Medizintechnik, Technische Universitaet Muenchen, 85748 Garching (Germany); Kiermaier, S. [Zentralinstitut fuer Medizintechnik, Technische Universitaet Muenchen, 85748 Garching (Germany); Schloesser, K. [Forschungszentrum Karlsruhe, 76021 Karlsruhe (Germany); Busch, H. [NTTF GmbH, 53619 Rheinbreitbach (Germany); Schenk, K. [NTTF GmbH, 53619 Rheinbreitbach (Germany); Streufert, D. [Acri.Tec GmbH, 16761 Hennigsdorf (Germany); Lanzl, I. [Augenklinik, Technische Universitaet Muenchen, 81675 Munich (Germany)

    2007-04-15

    A biodegradable, {beta}-emitting implant has been developed and successfully tested which prevents fresh intraocular pressure increase after glaucoma filtering surgery. Ion implantation has been used to load the polymeric implants with the {beta}-emitter {sup 32}P. The influence of ion implantation and gamma sterilisation on degradation and {sup 32}P-fixation behavior has been studied by ion beam and chemical analysis. Irradiation effects due to the applied ion fluence (10{sup 15} ions/cm{sup 2}) and gamma dose (25 kGy) are found to be tolerable.

  18. Combined Soft and Hard Tissue Peri-Implant Plastic Surgery Techniques to Enhance Implant Rehabilitation: A Case Report

    OpenAIRE

    Baltacıoğlu, Esra; Korkmaz, Fatih Mehmet; Bağış, Nilsun; Aydın, Güven; Yuva, Pınar; KORKMAZ, Yavuz Tolga; Bağış, Bora

    2014-01-01

    This case report presents an implant-aided prosthetic treatment in which peri-implant plastic surgery techniques were applied in combination to satisfactorily attain functional aesthetic expectations. Peri-implant plastic surgery enables the successful reconstruction and restoration of the balance between soft and hard tissues and allows the option of implant-aided fixed prosthetic rehabilitation.

  19. Effect of Implantation Machine Parameters on N+ ion Implantation for Upland Cotton(Gossypium hirsutum L.) Pollen

    Science.gov (United States)

    Yue, Jieyu; Yu, Lixiang; Wu, Yuejin; Tang, Canming

    2008-10-01

    Effect of parameters of ion implantation machine, including ion energy, total dose, dose rate, impulse energy and implantation interval on the pollen grains of upland cotton implanted with nitrogen ion beam were studied. The best parameters were screened out. The results also showed that the vacuum condition before the nitrogen ion implantation does not affect the pollen viability.

  20. Immediate implant post-surgical complications.

    Science.gov (United States)

    Ibbott, C G; Oles, R D

    1995-03-01

    Immediate surgical implants provide a convenient means of replacing missing teeth without requiring hard tissue reduction of restoration-free potential fixed partial denture abutments. Although the procedure is described as "predictable," complications and failures do occur. This report presents four cases of immediate implant complications and their management, and discusses possible causes of the untoward results. Careful pre-operative planning, adequate surgical technique and post-surgical management, timely and suitable loading, and meticulous hygiene maintenance can serve to minimize implant complications and failures. The prospective immediate implant patient must be provided with sufficient information to allow informed consent to be given. Minimal requirements are a description of the procedures in terms the patient can understand, an explanation of potential risks and complications, and adequate disclosure of information about alternative therapies. PMID:7773849

  1. An implantable blood pressure and flow transmitter.

    Science.gov (United States)

    Rader, R. D.; Meehan, J. P.; Henriksen, J. K. C.

    1973-01-01

    A miniature totally implantable FM/FM telemetry system has been developed to simultaneously measure blood pressure and blood flow, thus providing an appreciation of the hemodynamics of the circulation to the entire body or to a particular organ. Developed for work with animal subjects, the telemetry system's transmission time is controlled by an RF signal that permits an operating life of several months. Pressure is detected by a miniature intravascular transducer and flow is detected by an extravascular interferometric ultrasonic technique. Both pressure and flow are calibrated prior to implanting. The pressure calibration can be checked after the implanting by cannulation; flow calibration can be verified only at the end of the experiment by determining the voltage output from the implanted sensing system as a function of several measured flow rates. The utility of this device has been established by its use in investigating canine renal circulation during exercise, emotional encounters, administration of drugs, and application of accelerative forces.

  2. Silicon technologies ion implantation and thermal treatment

    CERN Document Server

    Baudrant, Annie

    2013-01-01

    The main purpose of this book is to remind new engineers in silicon foundry, the fundamental physical and chemical rules in major Front end treatments: oxidation, epitaxy, ion implantation and impurities diffusion.

  3. Moessbauer Studies of Implanted Impurities in Solids

    CERN Multimedia

    2002-01-01

    Moessbauer studies were performed on implanted radioactive impurities in semiconductors and metals. Radioactive isotopes (from the ISOLDE facility) decaying to a Moessbauer isotope were utilized to investigate electronic and vibrational properties of impurities and impurity-defect structures. This information is inferred from the measured impurity hyperfine interactions and Debye-Waller factor. In semiconductors isoelectronic, shallow and deep level impurities have been implanted. Complex impurity defects have been produced by the implantation process (correlated damage) or by recoil effects from the nuclear decay in both semiconductors and metals. Annealing mechanisms of the defects have been studied. \\\\ \\\\ In silicon amorphised implanted layers have been recrystallized epitaxially by rapid-thermal-annealing techniques yielding highly supersaturated, electrically-active donor concentrations. Their dissolution and migration mechanisms have been investigated in detail. The electronic configuration of Sb donors...

  4. Improved arrhythmia detection in implantable loop recorders

    DEFF Research Database (Denmark)

    Brignole, M.; Black, C.L.B.; Sutton, R.;

    2008-01-01

    Improved Arrhythmia Detection. Introduction: Implantable loop recorders (ILR) have an automatic arrhythmia detection feature that can be compromised by inappropriately detected episodes. This study evaluated a new ILR sensing and detection scheme for automatically detecting asystole...

  5. Nanostructures from hydrogen implantation of metals.

    Energy Technology Data Exchange (ETDEWEB)

    McWatters, Bruce Ray (Sandia National Laboratories, Albuquerque, NM); Causey, Rion A.; DePuit, Ryan J.; Yang, Nancy Y. C.; Ong, Markus D.

    2009-09-01

    This study investigates a pathway to nanoporous structures created by hydrogen implantation in aluminum. Previous experiments for fusion applications have indicated that hydrogen and helium ion implantations are capable of producing bicontinuous nanoporous structures in a variety of metals. This study focuses specifically on hydrogen and helium implantations of aluminum, including complementary experimental results and computational modeling of this system. Experimental results show the evolution of the surface morphology as the hydrogen ion fluence increases from 10{sup 17} cm{sup -2} to 10{sup 18} cm{sup -2}. Implantations of helium at a fluence of 10{sup 18} cm{sup -2} produce porosity on the order of 10 nm. Computational modeling demonstrates the formation of alanes, their desorption, and the resulting etching of aluminum surfaces that likely drives the nanostructures that form in the presence of hydrogen.

  6. Mastication forces and implant-bearing surface.

    Science.gov (United States)

    Le Gall, M G; Lauret, J F; Saadoun, A P

    1994-01-01

    This article discusses the shift of emphasis in implantology from the phenomenon of osseointegration of implants to the accurate fabrication of the prosthesis, recognizing the implant/prosthesis unit as an actual replica rather than a replacement of the missing tooth. The study of kinetics with its succession of mandibular cycles is used to discuss the integration of mastication and occlusion. The importance of periimplant ligament in natural teeth is discussed, along with the impact of its absence on implant mobility. The impact of the bone types and the root surface architecture on the implant-bearing surface is presented along with the stress of the mastication forces. All these factors have to be considered in the treatment planning and effectively communicated to the laboratory. The learning objective of this article is to provide updated information in those areas for the reader. PMID:7488751

  7. Ion implantation into concave polymer surface

    International Nuclear Information System (INIS)

    A new technique for ion implantation into concave surface of insulating materials is proposed and experimentally studied. The principle is roughly described by referring to modifying inner surface of a PET (polyethylene terephthalate) bottle. An electrode that is supplied with positive high-voltage pulses is inserted into the bottle. Both plasma formation and ion implantation are simultaneously realized by the same high-voltage pulses. Ion sheath with a certain thickness that depends on plasma parameters is formed just on the inner surface of the bottle. Since the plasma potential is very close to that of the electrode, ions from the plasma are accelerated in the sheath and implanted perpendicularly into the bottle's inner surface. Laser Raman spectroscopy shows that the inner surface of an ion-implanted PET bottle is modified into DLC (diamond-like carbon). Gas permeation measurement shows that gas-barrier property enhances due to the modification

  8. Ion implantation into concave polymer surface

    Science.gov (United States)

    Sakudo, N.; Shinohara, T.; Amaya, S.; Endo, H.; Okuji, S.; Ikenaga, N.

    2006-01-01

    A new technique for ion implantation into concave surface of insulating materials is proposed and experimentally studied. The principle is roughly described by referring to modifying inner surface of a PET (polyethylene terephthalate) bottle. An electrode that is supplied with positive high-voltage pulses is inserted into the bottle. Both plasma formation and ion implantation are simultaneously realized by the same high-voltage pulses. Ion sheath with a certain thickness that depends on plasma parameters is formed just on the inner surface of the bottle. Since the plasma potential is very close to that of the electrode, ions from the plasma are accelerated in the sheath and implanted perpendicularly into the bottle's inner surface. Laser Raman spectroscopy shows that the inner surface of an ion-implanted PET bottle is modified into DLC (diamond-like carbon). Gas permeation measurement shows that gas-barrier property enhances due to the modification.

  9. Cochlear implant in an ambulatory surgery center.

    Science.gov (United States)

    Joseph, Aimee M; Lassen, L Frederick

    2013-02-01

    Presbycusis, or sensorineural hearing loss in the elderly population, affects approximately 40% to 50% of people over the age of 75. A variety of devices are available to those with hearing loss. Cochlear implants, for example, are especially useful for those with severe-to-profound hearing loss. The population is aging, so the demand for cochlear implantation in ambulatory surgery centers will likely increase. Ambulatory surgery centers (ASC) can provide a more convenient and less expensive location for cochlear implant surgery than hospital-based operating facilities. Patient selection using standard ASC criteria, coupled with an understanding of the unique surgical and anesthetic needs of cochlear implant patients, are key to bringing this once exotic inpatient procedure into the ASC.

  10. Scleral melt following Retisert intravitreal fluocinolone implant

    Directory of Open Access Journals (Sweden)

    Georgalas I

    2014-11-01

    Full Text Available Ilias Georgalas,1 Chrysanthi Koutsandrea,1 Dimitrios Papaconstantinou,1 Dimitrios Mpouritis,1 Petros Petrou1,2 1Ophthalmology Department, University of Athens, Athens, Greece; 2Moorfields Eye Hospital, London, UKAbstract: Intravitreal fluocinolone acetonide implant (Retisert has a high potency, a low solubility, and a very short duration of action in the systemic circulation, enabling the steroid pellet to be small and reducing the risk of systemic side effects. Scleral melt has not been reported as a possible complication of Retisert implant. The authors describe the occurrence of scleral melt 18 months after the implantation of fluocinolone acetonide implant in a 42-year-old Caucasian woman. To the authors’ knowledge, this is the first report of this possible complication.Keywords: Retisert, scleral melt, complication, surgical management

  11. Artificial implantation materials; Sztuczne materialy implantacyjne

    Energy Technology Data Exchange (ETDEWEB)

    Lewandowska-Szumiel, M. [Akademia Medyczna, Warsaw (Poland)

    1997-10-01

    The radiation techniques for sterilization of orthopedic materials and high performance biomaterials have been reviewed. The radiation formulation of synthetic biomaterials for implantation and other medical use have been also performed. 18 refs, 3 tabs.

  12. Materials and technologies for soft implantable neuroprostheses

    Science.gov (United States)

    Lacour, Stéphanie P.; Courtine, Grégoire; Guck, Jochen

    2016-10-01

    Implantable neuroprostheses are engineered systems designed to restore or substitute function for individuals with neurological deficits or disabilities. These systems involve at least one uni- or bidirectional interface between a living neural tissue and a synthetic structure, through which information in the form of electrons, ions or photons flows. Despite a few notable exceptions, the clinical dissemination of implantable neuroprostheses remains limited, because many implants display inconsistent long-term stability and performance, and are ultimately rejected by the body. Intensive research is currently being conducted to untangle the complex interplay of failure mechanisms. In this Review, we emphasize the importance of minimizing the physical and mechanical mismatch between neural tissues and implantable interfaces. We explore possible materials solutions to design and manufacture neurointegrated prostheses, and outline their immense therapeutic potential.

  13. Implantable drug therapy device: A concept

    Science.gov (United States)

    Feldstein, C.

    1972-01-01

    Design is described of small, rechargeable, implantable infusor which contains fluid medicament stored under pressure and which dispenses fluid continuously through catheter. Body of infusor is covered by pliable silicone rubber sheath attached to suture pad for securing device.

  14. Colocación transpectoral superior de implantes mamarios: Relevancia técnica y anatómica Superior transpectoral insertion of breast implants: Anatomical and technical relevance

    Directory of Open Access Journals (Sweden)

    G. Peña Cabús

    2008-12-01

    Full Text Available Los tres planos de colocación de implantes para aumento mamario tienen particularidades claramente identificables. Cada modificación anatómica y los elementos tisulares acompañantes establecen beneficios y efectos adversos que influyen sobre el resultado final. El presente estudio tiene como objetivo la comunicación temprana de los hallazgos clínicos obtenidos con la creación de una cavidad de implantación en diferentes condiciones, utilizando una combinación de planos y haciendo énfasis en un fundamento anatómico y funcional de gran relevancia. El mejor manejo de los implantes mamarios y de otros biomateriales es el mantenimiento de su integridad y el control de su comportamiento a largo plazo. De manera prospectiva valoramos la colocación de implantes mamarios en una cavidad que es subfascial en la porción caudal de la mama y retropectoral en la porción cefálica. El aislamiento de las rutas linfáticas suprafasciales proporciona un menor riesgo de contaminación del implante. La facilidad técnica se produce al no tener que desinsertar inferior y medialmente el músculo pectoral. En los 15 casos estudiados, no se produjo ningún desplazamiento cefálico de los implantes con la contracción pectoral. Hacemos también una revisión de la sustentación anatómica y funcional del nuevo plano de implantación utilizado. El resultado es una suma de beneficios y la prevención de un frecuente efecto adverso, con lo que cumplimos el objetivo final de reducir la morbilidad e incrementar la seguridad del procedimiento.The particular benefits and adverse effects of the three different planes for breast implant placement are widely known. The search for a safer implantation cavity led to a combination of two dissection planes with different anatomical components placed in continuity. Instead of supporting its value with statistics of good outcomes, emphasis is stressed in the functional and anatomical consequences of the proposed plane of

  15. Potencial evocados corticales y evaluación lingüística de pacientes con implante coclear

    Directory of Open Access Journals (Sweden)

    Liudis Reina

    2011-12-01

    Full Text Available El objetivo de este trabajo fue examinar la utilidad del Potencial Evocado Auditivo Cortical (PEAC como herramienta objetiva que nos permita cuantificar el proceso de rehabilitación en pacientes con implante coclear. Se conformó una muestra de 20 pacientes, 12 del sexo masculino y con edades entre 7 y 16 años. Todos portadores de un Implante Coclear (IC modelo Clarion HiRes 90K. Todas las variables mostraron una correlación estadísticamente significativa con la etapa del proceso de rehabilitación en que se encontraba cada paciente. Los PEAC registrados en pacientes con IC muestran una morfología muy similar a la que se obtiene en sujetos normoyentes, registrándose los componentes que caracterizan esta respuesta (P1, N1, P2 y N2. Se evidenció una correlación estadísticamente significativa entre las etapas de rehabilitación y la latencia de los componentes P1 y N1. También hubo correlación estadísticamente significativa entre el por ciento de fonemas erróneos calculados tras la aplicación de la prueba del Registro Fonológico Inducido y la latencia del componente P1. Contar con herramientas objetivas como el PEAC nos garantizaría un mayor y mejor aprovechamiento de la rehabilitación lingüística, así como podría ayudar a perfeccionar las técnicas de rehabilitación de los pacientes con implante coclear.

  16. ELECTROMAGNETIC COMPATIBILITY AND RENEWABLE POWER FOR IMPLANTABLE NEUROSTIMULATORS

    OpenAIRE

    Pantchenko, Oxana S

    2012-01-01

    Over the last decade, the number of implantable neurostimulator systems implanted in patients has been rapidly growing. Nearly 50,000 neurostimulators are implanted worldwide annually. The most common type of implantable neurostimulators is indicated for pain relief. At the same time, commercial use of other electromagnetic technologies is expanding, making electromagnetic interference neurostimulator function an issue of concern. The susceptibility of six active implantable neurostimulators ...

  17. Evaluating mechanical properties and degradation of YTZP dental implants

    OpenAIRE

    Sevilla Sánchez, Pablo; Sandino Velazquez, Clara; Arciniegas Angarita, Milena Patricia; Martínez Gomis, Jordi; Peraire, M; Gil Mur, Francisco Javier

    2010-01-01

    Lately new biomedical grade yttria stabilized zirconia (YTZP) dental implants have appeared in the implantology market. This material has better aesthetical properties than conventional titanium used for implants but long term behaviour of these new implants is not yet well known. The aim of this paper is to quantify the mechanical response of YTZP dental implants previously degraded under different time conditions and compare the toughness and fatigue strength with titanium implants. Mech...

  18. Cumulative survival rate of Astra Tech implants: a retrospective analysis

    OpenAIRE

    Kim, Jung-Soo; Sohn, Joo-Yeon; Park, Jung-Chul; Jung, Ui-Won; Kim, Chang-Sung; Lee, Jae-Hoon; Shim, June-Sung; Lee, Keun-Woo; Choi, Seong-Ho

    2011-01-01

    Purpose The aim of this study was to analyze the short-term predictability and reliability of Astra Tech implants according to the demographical distribution of patients and condition of implant sites and location of implants. Methods Among patients treated with Astra Tech implant (Astra Tech AB) in the Department of Periodontology at the Dental Hospital of Yonsei University of College of Dentisry and K Dental Clinic from May 2004 to March 2009, 195 implants in 98 patients which had been rest...

  19. Implantable biomedical microsystems design principles and applications

    CERN Document Server

    Bhunia, Swarup; Sawan, Mohamad

    2015-01-01

    Research and innovation in areas such as circuits, microsystems, packaging, biocompatibility, miniaturization, power supplies, remote control, reliability, and lifespan are leading to a rapid increase in the range of devices and corresponding applications in the field of wearable and implantable biomedical microsystems, which are used for monitoring, diagnosing, and controlling the health conditions of the human body. This book provides comprehensive coverage of the fundamental design principles and validation for implantable microsystems, as well as several major application areas. Each co

  20. Additive manufacturing technologies of porous metal implants

    OpenAIRE

    Yang Quanzhan; Zhang Guirong

    2014-01-01

    Biomedical metal materials with good corrosion resistance and mechanical properties are widely used in orthopedic surgery and dental implant materials, but they can easily cause stress shielding due to the significant difference in elastic modulus between the implant and human bones. The elastic modulus of porous metals is lower than that of dense metals. Therefore, it is possible to adjust the pore parameters to make the elastic modulus of porous metals match or be comparable with that of th...

  1. Additive manufacturing technologies of porous metal implants

    Institute of Scientific and Technical Information of China (English)

    Zhou Linxi; Yang Quanzhan; Zhang Guirong; Zhao Fangxin; Shen Gang; Yu Bo

    2014-01-01

    Biomedical metal materials with good corrosion resistance and mechanical properties are widely used in orthopedic surgery and dental implant materials, but they can easily cause stress shielding due to the signiifcant difference in elastic modulus between the implant and human bones. The elastic modulus of porous metals is lower than that of dense metals. Therefore, it is possible to adjust the pore parameters to make the elastic modulus of porous metals match or be comparable with that of the bone tissue. At the same time, the open porous metals with pores connected to each other could provide the structural condition for bone ingrowth, which is helpful in strengthening the biological combination of bone tissue with the implants. Therefore, the preparation technologies of porous metal implants and related research have been drawing more and more attention due to the excellent features of porous metals. Selective laser melting (SLM) and electron beam melting technology (EBM) are important research fields of additive manufacturing. They have the advantages of directly forming arbitrarily complex shaped metal parts which are suitable for the preparation of porous metal implants with complex shape and ifne structure. As new manufacturing technologies, the applications of SLM and EBM for porous metal implants have just begun. This paper aims to understand the technology status of SLM and EBM, the research progress of porous metal implants preparation by using SLM and EBM, and the biological compatibility of the materials, individual design and manufacturing requirements. The existing problems and future research directions for porous metal implants prepared by SLM and EBM methods are discussed in the last paragraph.

  2. Anesthetic management of transcatheter aortic valve implantation

    OpenAIRE

    Annalisa Franco; Chiara Gerli; Laura Ruggeri; Fabrizio Monaco

    2012-01-01

    Transcatheter aortic valve implantation (TAVI) is an emergent technique for high-risk patients with aortic stenosis. TAVI poses significant challenges about its management because of the procedure itself and the population who undergo the implantation. Two devices are currently available and marketed in Europe and several other technologies are being developed. The retrograde transfemoral approach is the most popular procedure; nevertheless, it may not be feasible in patients with significant ...

  3. Additive manufacturing technologies of porous metal implants

    Directory of Open Access Journals (Sweden)

    Yang Quanzhan

    2014-06-01

    Full Text Available Biomedical metal materials with good corrosion resistance and mechanical properties are widely used in orthopedic surgery and dental implant materials, but they can easily cause stress shielding due to the significant difference in elastic modulus between the implant and human bones. The elastic modulus of porous metals is lower than that of dense metals. Therefore, it is possible to adjust the pore parameters to make the elastic modulus of porous metals match or be comparable with that of the bone tissue. At the same time, the open porous metals with pores connected to each other could provide the structural condition for bone ingrowth, which is helpful in strengthening the biological combination of bone tissue with the implants. Therefore, the preparation technologies of porous metal implants and related research have been drawing more and more attention due to the excellent features of porous metals. Selective laser melting (SLM and electron beam melting technology (EBM are important research fields of additive manufacturing. They have the advantages of directly forming arbitrarily complex shaped metal parts which are suitable for the preparation of porous metal implants with complex shape and fine structure. As new manufacturing technologies, the applications of SLM and EBM for porous metal implants have just begun. This paper aims to understand the technology status of SLM and EBM, the research progress of porous metal implants preparation by using SLM and EBM, and the biological compatibility of the materials, individual design and manufacturing requirements. The existing problems and future research directions for porous metal implants prepared by SLM and EBM methods are discussed in the last paragraph.

  4. Biomimetic Hydroxyapatite Coating on Metal Implants

    OpenAIRE

    Habibovic, Pamela; Barrere, Florence; Blitterswijk, van, H.; Groot, de, W.T.; Layrolle, Pierre

    2002-01-01

    The combination of the high mechanical strength of metals with the osteoconductive properties of calcium phosphates make hydroxyapatite coatings on titanium implants widely used in orthopedic surgery. However, the most popular coating method, plasma spraying, exhibits some important drawbacks: the inability to cover porous implants and to incorporate biologically active agents, delamination, and particle release. The aim of this study was to elaborate a dense, strong, and thick calcium-phosph...

  5. Mandrels For Microtextured Small-Vessel Implants

    Science.gov (United States)

    Deininger, William D.; Gabriel, Stephen B.

    1989-01-01

    Research shows artificial blood-vessel and heart-valve implants made more compatible with their biological environments by use of regularly microtextured surfaces. In new manufacturing process, ion beam etches patterned array of small pillars on mandrel used to mold tubular plastic implant. Pillars create tiny regularly spaced holes in inner surface of tube. Holes expected to provide sites for attachment of healthy lining. Polytetrafluoroethylene (PTFE) used as mandrel material because it can be etched by ion beam.

  6. Music Therapy for Preschool Cochlear Implant Recipients

    OpenAIRE

    Gfeller, Kate; Driscoll, Virginia; Kenworthy, Maura; Van Voorst, Tanya

    2011-01-01

    This paper provides research and clinical information relevant to music therapy for preschool children who use cochlear implants (CI). It consolidates information from various disciplinary sources regarding (a) cochlear implantation of young prelingually-deaf children (~age 2-5), (b) patterns of auditory and speech-language development, and (c) research regarding music perception of children with CIs. This information serves as a foundation for the final portion of the article, which describe...

  7. Radioactive ion implantation of thermoplastic elastomers

    OpenAIRE

    Borcea, Veronica

    2008-01-01

    The radioactive ion implantation wear measuring method (RII) has been used for many years as a tool to make highly sensitive real-time in-situ measurements of wear and corrosion in metallic or ceramic materials. The method consists of the controlled implantation of radioactive ions of limited decay time in a thin layer at the surface of the material. The progressive abrasion of the material results in a decline in radioactivity which is followed to monitor material losses. The application ...

  8. Remote monitoring of cardiac implantable electronic devices

    OpenAIRE

    Lappegård, Knut Tore

    2015-01-01

    Seminario desarrollado en la Segunda Conferencia Internacional de Comunicación en Salud, celebrada el 23 de octubre de 2015 en la Universidad Carlos III de Madrid Cardiac implantable electronic devices (CIEDs) are used with increasing frequency for the diagnosis and treatment of cardiac arrhythmias. In Europe, a total number of 550,000 pacemakers and 180,000 defibrillators were implanted in 2014. Follow-up of these patients is a large challenge to the health system and requires a substanti...

  9. A radiographic analysis of implant component misfit.

    LENUS (Irish Health Repository)

    Sharkey, Seamus

    2011-07-01

    Radiographs are commonly used to assess the fit of implant components, but there is no clear agreement on the amount of misfit that can be detected by this method. This study investigated the effect of gap size and the relative angle at which a radiograph was taken on the detection of component misfit. Different types of implant connections (internal or external) and radiographic modalities (film or digital) were assessed.

  10. Bilateral Pseudoexfoliation Deposits on Intraocular Lens Implants

    OpenAIRE

    Elena Bonafonte Marquez; Sergio Bonafonte Royo

    2015-01-01

    We present a rare case of bilateral pseudoexfoliative deposits on both intraocular lens (IOL) implants in an 83-year-old woman with no other associated pathology, 5 years after cataract surgery. Pseudoexfoliation syndrome is the most common cause of secondary open-angle glaucoma worldwide and these deposits are usually found on the natural lens. The fact that pseudoexfoliative deposits have been found on IOL implants implies the need for a thorough examination in pseudophakic patients, for i...

  11. Bone tissue reactions to dental implants

    OpenAIRE

    Sh. Namjo Nik

    1994-01-01

    There has been a lot of development in the science of implantology since forty years ago when extensive research began on this field of science. The use of Dental Implantology has also increased in the last decade, which the main reason is the success of it. Recently some of our colleagues participate in short time Introductory and advanced courses of implant inside or outside the country and begin to use implants. Unfortunately, due to the insufficient period of time, there is no discussion ...

  12. Are short implants in the mandible safe?

    OpenAIRE

    Sergio Henrique Gonçalves Motta; Marcelo Barbosa Barros; Flávia Rabello de Mattos; Andrea Leonardo da Silva; Ana Roseli de Queiroz Gonçalves

    2009-01-01

    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 Sar...

  13. La luz del origen del universo

    Directory of Open Access Journals (Sweden)

    Casas, Alberto

    2015-10-01

    Full Text Available Penzias and Wilson discovered the cosmic microwave background, a luminous echo of the Big Bang, in 1965. The amount of information encoded in this relic of the early universe is truly extraordinary. At present, the most precise data about the origin and structure of the universe comes from the study of this primordial light, the full potential of which has yet to be explored.En 1965 se descubrió el fondo de radiación de microondas, un eco luminoso de la Gran Explosión (Big Bang. La cantidad de información contenida en esta reliquia del universo primitivo es verdaderamente extraordinaria. En la actualidad los datos más precisos sobre el origen y estructura del universo provienen del estudio de esta luz primigenia, que aún no ha sido explorada en todo su potencial.

  14. Photoelastic Analysis of Fixed Partial Prosthesis Crown Height and Implant Length on Distribution of Stress in Two Dental Implant Systems

    OpenAIRE

    Evandro Portela Figueirêdo; Eder Alberto Sigua-Rodriguez; Marcele Jardim Pimentel; Ana Regina Oliveira Moreira; Mauro Antônio de Arruda Nóbilo; José Ricardo de Albergaria-Barbosa

    2014-01-01

    The aim of this study was to evaluate by photoelastic analysis stress distribution on short and long implants of two dental implant systems with 2-unit implant-supported fixed partial prostheses of 8 mm and 13 mm heights. Sixteen photoelastic models were divided into 4 groups: I: long implant (5 × 11 mm) (Neodent), II: long implant (5 × 11 mm) (Bicon), III: short implant (5 × 6 mm) (Neodent), and IV: short implants (5 × 6 mm) (Bicon). The models were positioned in a circular polariscope assoc...

  15. Apicectomía o implante: Reporte de un caso clínico.

    OpenAIRE

    Enrique Fernández-Bodereau; Patricia Tortolini

    2012-01-01

    RESUMEN Se reporta un caso clínico de un paciente al que se le realizó apicectomía en un premolar superior, presumiblemente por una endodoncia realizada en forma inadecuada y tener un perno colado donde la extracción del mismo correría el riesgo de la fractura dentaria. Fracasado dicho tratamiento se realiza un implante inmediato a la exodoncia, donde se colocó relleno óseo autólogo y xenoinjerto con membrana de colágeno reabsorbible. De esto se deduce que la faz diagnóstica es muy importante...

  16. Modification of mechanical properties through ion implantation

    International Nuclear Information System (INIS)

    Fatigue, internal friction, and cavitation-erosion properties of plain steel, containing 0.18 wt.% carbon (AISI 1018), have been modified by implantation with nitrogen molecules of 150 KeV energy. It is suggested that these phenomena are related to the interactions of the implant with dislocations. Specifically, room temperature, high-cycle fatigue-lifetime can be significantly extended when the implanted specimens are aged for times sufficiently long to enable interstitial migration to and association with near-surface dislocations. Acoustically-induced cavitation-erosion behavior in distilled water at ambient temperature is also found to be improved by implantation. The role played by interstitial-dislocation association in improving these properties is examined with ultra-high sensitive internal friction and with scanning and transmission electron microscopy. Such experiments are aiding in an elucidation of the fate of the implanted nitrogen in body-centered cubic steels. These preliminary results indicate the potential applications of ion implantation for the improvement of surface-related mechanical properties. (author)

  17. Divacancy formation by polyatomic ion implantation

    International Nuclear Information System (INIS)

    The production of the neutral divacancy absorption band (1.8 μm at 3000K) by the polyatomic series C+ (70 keV), CO+ (163 keV), CO2+ (256 keV), and by O1+ (85 keV), O2+ (170 keV), O3+ (255 keV) has been investigated. The oxygen series is emphasized because equal total energy and impurity deposition can be achieved simultaneously. For fluences significantly less than those required for amorphous layer formation, divacancy formation by 255 keV O3+ implantation at 3000K is approximately 1.5 times that for an equal atomic dose introduced by 85 keV O1+ implantation. Divacancy formation at 800K followed by heating to 3000K, is approximately 1.3 times that for an equivalent implantation at 3000K. An enhanced probability for divacancy formation with increasing initial defect density is suggested to explain the polyatomic and temperature effects. For polyatomic implantation the initial defect density is increased by simultaneous collisions within a cascade, while suppressed annealing allows accumulation of initial defects for low temperature implantation. Defect annealing for energy deposition near the crystalline-to-amorphous transition is especially important in determining the nature of the disorder. The results are compared with previous channeling-backscattering measurements of disorder produced by polyatomic implantation

  18. Infrapubic approach for malleable penile implant

    Directory of Open Access Journals (Sweden)

    Oswaldo L. D. Berg

    2011-02-01

    Full Text Available PURPOSE: Today, we find that the implant of malleable prostheses still plays a leading role in the surgical treatment of erectile dysfunction. These may involve patients for which the cosmetic advantages of inflatable devices are not as important as low cost, the easier use and less incidence of mechanical complications in the malleable implants. This paper demonstrates infrapubic approach as a technical option for this kind of implant. SURGICAL TECHNIQUE: It offers technical resources and emphasizes the facility in using the method, reducing cutaneous exposure, which diminishes risks of contamination. COMMENTS: As occurs in inflatable implants, when implanting malleable prostheses through the infrapubic access, care must also be taken regarding the possibility of lesion to the vascular-nervous bundle. On the other hand, the approach through the dorsal surface of the corpora cavernosa has a natural capacity for anatomical protection of the urethra, not requiring transurethral catheterization. This benefit is of the utmost importance when considering possible causes of per and postoperative morbidity. Accordingly, we can consider that the infrapubic approach is an effective method and prevails as a technical option for implanting malleable prostheses.

  19. Porous Titanium for Dental Implant Applications

    Directory of Open Access Journals (Sweden)

    Zena J. Wally

    2015-10-01

    Full Text Available Recently, an increasing amount of research has focused on the biological and mechanical behavior of highly porous structures of metallic biomaterials, as implant materials for dental implants. Particularly, pure titanium and its alloys are typically used due to their outstanding mechanical and biological properties. However, these materials have high stiffness (Young’s modulus in comparison to that of the host bone, which necessitates careful implant design to ensure appropriate distribution of stresses to the adjoining bone, to avoid stress-shielding or overloading, both of which lead to bone resorption. Additionally, many coating and roughening techniques are used to improve cell and bone-bonding to the implant surface. To date, several studies have revealed that porous geometry may be a promising alternative to bulk structures for dental implant applications. This review aims to summarize the evidence in the literature for the importance of porosity in the integration of dental implants with bone tissue and the different fabrication methods currently being investigated. In particular, additive manufacturing shows promise as a technique to control pore size and shape for optimum biological properties.

  20. MR Imaging of Knee Arthroplasty Implants.

    Science.gov (United States)

    Fritz, Jan; Lurie, Brett; Potter, Hollis G

    2015-01-01

    Primary total knee arthroplasty is a highly effective treatment that relieves pain and improves joint function in a large percentage of patients. Despite an initially satisfactory surgical outcome, pain, dysfunction, and implant failure can occur over time. Identifying the etiology of complications is vital for appropriate management and proper timing of revision. Due to the increasing number of knee arthroplasties performed and decreasing patient age at implantation, there is a demand for accurate diagnosis to determine appropriate treatment of symptomatic joints following knee arthroplasty, and for monitoring of patients at risk. Magnetic resonance (MR) imaging allows for comprehensive imaging evaluation of the tissues surrounding knee arthroplasty implants with metallic components, including the polyethylene components. Optimized conventional and advanced pulse sequences can result in substantial metallic artifact reduction and afford improved visualization of bone, implant-tissue interfaces, and periprosthetic soft tissue for the diagnosis of arthroplasty-related complications. In this review article, we discuss strategies for MR imaging around knee arthroplasty implants and illustrate the imaging appearances of common modes of failure, including aseptic loosening, polyethylene wear-induced synovitis and osteolysis, periprosthetic joint infections, fracture, patellar clunk syndrome, recurrent hemarthrosis, arthrofibrosis, component malalignment, extensor mechanism injury, and instability. A systematic approach is provided for evaluation of MR imaging of knee implants. MR imaging with optimized conventional pulse sequences and advanced metal artifact reduction techniques can contribute important information for diagnosis, prognosis, risk stratification, and surgical planning. PMID:26295591

  1. Ion implantations of oxide dispersion strengthened steels

    Science.gov (United States)

    Sojak, S.; Simeg Veternikova, J.; Slugen, V.; Petriska, M.; Stacho, M.

    2015-12-01

    This paper is focused on a study of radiation damage and thermal stability of high chromium oxide dispersion strengthened steel MA 956 (20% Cr), which belongs to the most perspective structural materials for the newest generation of nuclear reactors - Generation IV. The radiation damage was simulated by the implantation of hydrogen ions up to the depth of about 5 μm, which was performed at a linear accelerator owned by Slovak University of Technology. The ODS steel MA 956 was available for study in as-received state after different thermal treatments as well as in ions implanted state. Energy of the hydrogen ions chosen for the implantation was 800 keV and the implantation fluence of 6.24 × 1017 ions/cm2. The investigated specimens were measured by non-destructive technique Positron Annihilation Lifetime Spectroscopy in order to study the defect behavior after different thermal treatments in the as-received state and after the hydrogen ions implantation. Although, different resistance to defect production was observed in individual specimens of MA 956 during the irradiation, all implanted specimens contain larger defects than the ones in as-received state.

  2. Cochlear implants: our experience and literature review

    Directory of Open Access Journals (Sweden)

    Martins, Mariane Barreto Brandão

    2012-01-01

    Full Text Available Introduction: Cochlear Implants are important for individuals with severe to profound bilateral sensorineural hearing loss. Objective: Evaluate the experience of cochlear implant center of Otorhinolaryngology through the analysis of records of 9 patients who underwent cochlear implant surgery. Methods: This is a retrospective study performed with the patients records. Number 0191.0.107.000-11 ethics committee approval. We evaluated gender, etiology, age at surgery, duration of deafness, classification of deafness, unilateral or bilateral surgery, intraoperative and postoperative neural response and impedance of the electrodes in intraoperative and preoperative tests and found those that counter-indicated surgery. Results: There were 6 pediatric and 3 adult patients. Four male and 5 female. Etiologies: maternal rubella, cytomegalovirus, ototoxicity, meningitis, and sudden deafness. The age at surgery and duration of deafness ranged from 2 - 46 years and 2 - 18 years, respectively. Seven patients were pre-lingual. All had profound bilateral PA. There were 7 bilateral implants. Intraoperative complications: hemorrhage. Complications after surgery: vertigo and internal device failure. In 7 patients the electrodes were implanted through. Telemetry showed satisfactory neural response and impedance. CT and MRI was performed in all patients. We found enlargement of the vestibular aqueduct in a patient and incudomalleolar malformation. Conclusion: The cochlear implant as a form of auditory rehabilitation is well established and spreading to different centers specialized in otoaudiology. Thus, the need for structured services and trained professionals in this type of procedure is clear.

  3. Las cosas del quehacer

    OpenAIRE

    Sergio C. Staude

    2010-01-01

    El psicoanálisis es una praxis y no una práctica especulativa que solo busca afianzar un saber. Esta praxis encuentra su eje central en la noción de acto que es la invitación —y el sostén— a una experiencia y no a la acumulación de información. Ese acto da cuenta del tiempo de un pasaje, y el artículo destaca dos: el del momento inaugural del psicoanálisis y el de la función del psicoanalista en el devenir del análisis. A ambas las une la responsabilidad ...

  4. Desarrollo del lenguaje

    Directory of Open Access Journals (Sweden)

    Silva Villena Omer

    2004-06-01

    Full Text Available

    E. Owens Robert (2003. Desarrollo del lenguaje. Madrid: Pearson Education, S.A. , 2003, (463 páginas. Estamos ante un texto destinado a entender el dominio o ámbito de la "psicolingüística del desarrollo" en el que terapeutas del lenguaje, psicólogos, profesores y lingüistas encontrarán información actualizada y amplia en lo que respecta a los avances que este campo ha experimentado en las dos últimas décadas. Tanto en las cinco ediciones en lengua inglesa desde 1998 a esta esperada edición en español, el propósito del autor es entregar una visión profunda de los procesos de adquisición y desarrollo del lenguaje.

  5. Impact of dental implant insertion method on the peri-implant bone tissue: Experimental study

    Directory of Open Access Journals (Sweden)

    Stamatović Novak

    2013-01-01

    Full Text Available Background/Aim. The function of dental implants depends on their stability in bone tissue over extended period of time, i.e. on osseointegration. The process through which osseointegration is achieved depends on several factors, surgical insertion method being one of them. The aim of this study was to histopathologically compare the impact of the surgical method of implant insertion on the peri-implant bone tissue. Methods. The experiment was performed on 9 dogs. Eight weeks following the extraction of lower premolars implants were inserted using the one-stage method on the right mandibular side and two-stage method on the left side. Three months after implantation the animals were sacrificed. Three distinct regions of bone tissue were histopathologically analyzed, the results were scored and compared. Results. In the specimens of one-stage implants increased amount of collagen fibers was found in 5 specimens where tissue necrosis was also observed. Only moderate osteoblastic activity was found in 3 sections. The analysis of bone-to-implant contact region revealed statistically significantly better results regarding the amount of collagen tissue fibers for the implants inserted in the two-stage method (Wa = 59 105, α = 0.05. No necrosis and osteoblastic activity were observed. Conclusion. Better results were achieved by the two-stage method in bone-to-implant contact region regarding the amount of collagen tissue, while the results were identical regarding the osteoblastic activity and bone tissue necrosis. There was no difference between the methods in the bone-implant interface region. In the bone tissue adjacent to the implant the results were identical regarding the amount of collagen tissue, osteoblastic reaction and bone tissue necrosis, while better results were achieved by the two-stage method regarding the number of osteocytes.

  6. Probing around implants and teeth with healthy or inflamed peri-implant mucosa/gingival. A histologic comparison in cynomolgus monkeys. (Macaca fascicularis)

    DEFF Research Database (Denmark)

    Schou, Søren; Holmstrup, Palle; Stoltze, K.;

    2002-01-01

    Osseointegrated oral implants; teeth; phathology; peri-implant mucositis; gingivitis; peri-implantitis; periodontitis; diagnosis; probing depth; non-human primates; cynomolgus monkeys: Macaca fascicularis......Osseointegrated oral implants; teeth; phathology; peri-implant mucositis; gingivitis; peri-implantitis; periodontitis; diagnosis; probing depth; non-human primates; cynomolgus monkeys: Macaca fascicularis...

  7. Photoelastic Analysis of Fixed Partial Prosthesis Crown Height and Implant Length on Distribution of Stress in Two Dental Implant Systems

    Directory of Open Access Journals (Sweden)

    Evandro Portela Figueirêdo

    2014-01-01

    Full Text Available The aim of this study was to evaluate by photoelastic analysis stress distribution on short and long implants of two dental implant systems with 2-unit implant-supported fixed partial prostheses of 8 mm and 13 mm heights. Sixteen photoelastic models were divided into 4 groups: I: long implant (5×11 mm (Neodent, II: long implant (5×11 mm (Bicon, III: short implant (5×6 mm (Neodent, and IV: short implants (5×6 mm (Bicon. The models were positioned in a circular polariscope associated with a cell load and static axial (0.5 Kgf and nonaxial load (15°, 0.5 Kgf were applied to each group for both prosthetic crown heights. Three-way ANOVA was used to compare the factors implant length, crown height, and implant system (α=0.05. The results showed that implant length was a statistically significant factor for both axial and nonaxial loading. The 13 mm prosthetic crown did not result in statistically significant differences in stress distribution between the implant systems and implant lengths studied, regardless of load type (P>0.05. It can be concluded that short implants showed higher stress levels than long implants. Implant system and length was not relevant factors when prosthetic crown height were increased.

  8. Pre-implantation implantable cardioverter defibrillator concerns and Type D personality increase the risk of mortality in patients with an implantable cardioverter defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; van den Broek, Krista C; Erdman, Ruud A M;

    2010-01-01

    Little is known about the influence of psychological factors on prognosis in implantable cardioverter defibrillator (ICD) patients. We examined the influence of the distressed personality (Type D) and pre-implantation device concerns on short-term mortality in ICD patients.......Little is known about the influence of psychological factors on prognosis in implantable cardioverter defibrillator (ICD) patients. We examined the influence of the distressed personality (Type D) and pre-implantation device concerns on short-term mortality in ICD patients....

  9. Macro design effects on stress distribution around implants: A photoelastic stress analysis

    Directory of Open Access Journals (Sweden)

    Serhat Emre Ozkir

    2012-01-01

    Conclusion: As there were observable differences between the implant types, straight placed cylindrical implants showed better stress distribution characteristics, while inclined tapering implants had better stress distribution characteristics.

  10. Elementos del sistema electoral del Congreso Mexicano

    Directory of Open Access Journals (Sweden)

    Aldo Medina García

    2013-07-01

    Full Text Available El presente artículo es un estudio de los componentes del sistema electoral, diseñado por el legislador mexicano para integrar al parlamento federal. Estudio desarrollado a sabiendas de la importancia que reviste el sistema electoral como un medio que permite a los ciudadanos convertir su voto expresado en las urnas en escaños a favor de determinado candidato o partido. En dicho análisis tomamos en cuenta la evolución constitucional del sistema electoral mexicano, la participación de las fuerzas minoritarias en la integración del Senado y de la Cámara de Diputados, la división que se hace del territorio en circunscripciones electorales, la barrera electoral que se fija a los partidos políticos para acceder a la representación en el Parlamento, la fórmula de asignación que se aplica a la votación obtenida, para finalmente concluir que el sistema electoral mexicano es esencialmente mayoritario aun cuando se vista de proporcional.

  11. OBJETIVO DEL DESARROLLO DEL MILENIO 7

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    Margarita M. Pérez O.

    2013-10-01

    Full Text Available Los Objetivos de Desarrollo del Milenio, también conocidos como los Objetivos del Milenio, constituyeron las metas finales que aprobaron los dirigentes mundiales, 189 jefes de estado y de gobierno en la Cumbre del Milenio de las Naciones Unidas celebrada en Nueva York en el año 2000, en la cual los Estados miembros de la organización reafirmaron su compromiso de luchar por un mundo en el que el desarrollo sostenible y la eliminación de la pobreza tuvieran máxima prioridad1 . En la cumbre se definió la Declaración del Milenio, la cual detalla los objetivos, principios, valores, metas y acciones para erradicar la pobreza Mundial hacia el año 2015, todos ellos ratificados con alto interés y acción estratégica de carácter global, como marco para la medición de los progresos en materia de desarrollo.

  12. La crisi del diritto del lavoro

    Directory of Open Access Journals (Sweden)

    Alessandro Garilli

    2012-01-01

    Full Text Available Riassunto - L’Autore ripercorre in chiave critica l’evoluzione delle politiche legislative in materia di lavoro, alla luce dell’attuale fase di crisi economico finanziaria. Nell’esaminare i principali interventi normativi attuati da inizio secolo, l’Autore mette in evidenza le scelte di metodo e gli elementi di continuità che accomunano i vari provvedimenti, individuandoli nell’affannosa ricerca del punto di equilibrio tra flessibilità e garantismo. La riflessione si chiude con alcuni interrogativi sulle ultime linee di riforma del mercato del lavoro e con l’auspicio che, anche al cospetto delle imprescindibili ragioni dell’economia, il diritto del lavoro possa continuare a svolgere il proprio tradizionale ruolo di disciplina di tutela della persona.   Abstract - The author analyzes, with a critically oriented approach, the development of the employment law, in the light of the current economic and financial crisis. In examining the main regulatory measures implemented since the beginning of the century, the author highlights the methodological choices and the elements of continuity that unite the various measures, focusing them in a hard research of a point of balance between flexibility and security. The discussion concludes with some questions about the last lines of the reform of the labor market and with the hope that, even in the face of compelling reasons of economy, labor law can continue to play its traditional role of governing the protection of person.

  13. Elementos del sistema electoral del Congreso Mexicano

    Directory of Open Access Journals (Sweden)

    Aldo Medina García

    2013-08-01

    Full Text Available El presente artículo es un estudio de los componentes del sistema electoral, diseñado por el legislador mexicano para integrar al parlamento federal. Estudio desarrollado a sabiendas de la importancia que reviste el sistema electoral como un medio que permite a los ciudadanos convertir su voto expresado en las urnas en escaños a favor de determinado candidato o partido. En dicho análisis tomamos en cuenta la evolución constitucional del sistema electoral mexicano, la participación de las fuerzas minoritarias en la integración del Senado y de la Cámara de Diputados, la división que se hace del territorio en circunscripciones electorales, la barrera electoral que se fija a los partidos políticos para acceder a la representación en el Parlamento, la fórmula de asignación que se aplica a la votación obtenida, para finalmente concluir que el sistema electoral mexicano es esencialmente mayoritario aun cuando se vista de proporcional.

  14. Cochlear implantation in late-implanted prelingually deafened adults: changes in quality of life.

    NARCIS (Netherlands)

    Straatman, L.V.; Huinck, W.J.; Langereis, M.C.; Snik, A.F.M.; Mulder, J.J.S.

    2014-01-01

    BACKGROUND: With expanding inclusion criteria for cochlear implantation, the number of prelingually deafened persons who are implanted as adults increases. Compared with postlingually deafened adults, this group shows limited improvement in speech recognition. In this study, the changes in health-re

  15. Metals for bone implants. Part 1. Powder metallurgy and implant rendering.

    Science.gov (United States)

    Andani, Mohsen Taheri; Shayesteh Moghaddam, Narges; Haberland, Christoph; Dean, David; Miller, Michael J; Elahinia, Mohammad

    2014-10-01

    New metal alloys and metal fabrication strategies are likely to benefit future skeletal implant strategies. These metals and fabrication strategies were looked at from the point of view of standard-of-care implants for the mandible. These implants are used as part of the treatment for segmental resection due to oropharyngeal cancer, injury or correction of deformity due to pathology or congenital defect. The focus of this two-part review is the issues associated with the failure of existing mandibular implants that are due to mismatched material properties. Potential directions for future research are also studied. To mitigate these issues, the use of low-stiffness metallic alloys has been highlighted. To this end, the development, processing and biocompatibility of superelastic NiTi as well as resorbable magnesium-based alloys are discussed. Additionally, engineered porosity is reviewed as it can be an effective way of matching the stiffness of an implant with the surrounding tissue. These porosities and the overall geometry of the implant can be optimized for strain transduction and with a tailored stiffness profile. Rendering patient-specific, site-specific, morphology-specific and function-specific implants can now be achieved using these and other metals with bone-like material properties by additive manufacturing. The biocompatibility of implants prepared from superelastic and resorbable alloys is also reviewed.

  16. Experimental implantation of epiretinal retina implants (EPI-RET) with an IOL-type receiver unit

    Science.gov (United States)

    Gerding, H.; Benner, F. P.; Taneri, S.

    2007-03-01

    The purpose of this paper is to investigate the surgical feasibility of implantation and long-term structural outcome of retina implant devices with an anterior IOL receiver, a connecting microcable and posterior segment epiretinal microcontacts. Implantation of epiretinal retina (EPI-RET) implants was performed as a one-step surgical procedure including phacoemulsification and pars plana vitrectomy in two adult rabbits. Implants were mechanically stabilized in an anterior position by the lens capsule and in the posterior segment by microtacks with a soft contact collar. Follow-up (6 and 9 months) included regular clinical examination, anterior and posterior segment photography and finally pathohistological evaluation. Implantation was uneventful in case 1 and complicated by vitreous space haemorrhage in case 2. At the end of follow-up, the retina was partially detached in animal 1 and subtotally detached in animal 2. Common features of tissue reaction in both cases were the formation of cyclitic membranes extending around and posterior to the anterior IOL receiver. In addition to that severe proliferations developed around microcables, microcontacts and microtacks forming a tissue capsule around posterior segment foreign materials. Retinal areas in contact to implant devices presented a severe structural damage and disorganization. Results of this preliminary trial suggest that the application of epiretinal prostheses with large diameter IOL receivers may be a critical issue and can give rise to an unfavourable outcome. Further systematic investigation ought to be performed involving a larger number of animals, modified implants and perhaps other species.

  17. Clinical evaluation of mandibular implant overdentures via Locator implant attachment and Locator bar attachment

    Science.gov (United States)

    Seo, Yong-Ho; Bae, Eun-Bin; Kim, Jung-Woo; Lee, So-Hyoun; Jeong, Chang-Mo; Jeon, Young-Chan

    2016-01-01

    PURPOSE The aim of this study was to evaluate the clinical findings and patient satisfaction on implant overdenture designed with Locator implant attachment or Locator bar attachment in mandibular edentulous patients. MATERIALS AND METHODS Implant survival rate, marginal bone loss, probing depth, peri-implant inflammation, bleeding, plaque, calculus, complications, and satisfaction were evaluated on sixteen patients who were treated with mandibular overdenture and have used it for at least 1 year (Locator implant attachment: n=8, Locator bar attachment: n=8). RESULTS Marginal bone loss, probing depth, plaque index of the Locator bar attachment group were significantly lower than the Locator implant attachment group (P.05). The replacement of the attachment components was the most common complication in both groups. Although there was no correlation between marginal bone loss and plaque index, a significant correlation was found between marginal bone loss and probing depth. CONCLUSION The Locator bar attachment group indicates lesser marginal bone loss and need for maintenance, as compared with the Locator implant attachment group. This may be due to the splinting effect among implants rather than the types of Locator attachment. PMID:27555901

  18. Music and Quality of Life in Early-Deafened Late-Implanted Adult Cochlear Implant Users

    NARCIS (Netherlands)

    Fuller, Christina; Mallinckrodt, Lisa; Maat, Bert; Başkent, Deniz; Free, Rolien

    2013-01-01

    Hypothesis and Background: The early-deafened, late-implanted (EDLI) CI users constitute a relatively new and understudied clinical population. To contribute to a better understanding of the implantation outcome, this study evaluated this population for self-reported enjoyment and perception of musi

  19. Single-Stage Ear Reconstruction and Hearing Restoration Using Polyethylene Implant and Implantable Hearing Devices.

    Science.gov (United States)

    Hempel, John Martin

    2015-12-01

    The use of porous polyethylene in reconstructive surgery of the auricle is becoming increasingly accepted. This is a single-stage procedure providing pleasing cosmetic rehabilitation. Further advantages are the possibility of early implantation and the lack of complications caused by harvesting costal cartilage. Additional hearing restoration using middle ear implants allows functional rehabilitation at an early stage. PMID:26667635

  20. Acid etching does not improve CoCrMo implant osseointegration in a canine implant model.

    Science.gov (United States)

    Jakobsen, Stig S; Baas, Jorgen; Jakobsen, Thomas; Soballe, Kjeld

    2010-01-01

    Induction of bone ingrowth by topographical changes to implant surfaces is an attractive concept. Topographical modifications achieved by acid etching are potentially applicable to complex 3D surfaces. Using clinically relevant implant models, we explored the effect of wet etching porous bead-coated CoCrMo. The study was designed as two paired animal experiments with 10 dogs. Each dog received four implants; one in each medial femoral condyle (loaded 0.75-mm-gap model) and one in each proximal tibia (press-fit). The implants were observed for 6 weeks and were evaluated by biomechanical pushout tests and histomorphometry. We found that wet etching porous bead-coated CoCrMo implants failed to improve implant performance. Moreover, a tendency towards increased fibrous tissue formation, decreased new bone formation, and decreased mechanical fixation was observed. Surface topography on implants is able to stimulate bone-forming cells, but the clinical performance of an implant surface perhaps relies more on 3D geometrical structure and biocompatibility. Caution should be exercised regarding the results of wet etching of porous bead-coated CoCrMo and there is a need for more preclinical trials. PMID:20544657