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Sample records for centrales totalmente implantables

  1. 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

  2. Reservorios venosos centrales totalmente implantables, tipo Port-A-Cath, en pacientes oncológicos: Revisión de Complicaciones Totally implantable central venous devices (Port-A-Cath) in oncological patients: Review of complications

    OpenAIRE

    E. Freiré; La Iglesia, A.; C. Rodríguez; LÓpez, M. A.; González, M.; R. Peleteiro; M.A. Camba

    2008-01-01

    El objetivo de esta revisión fue la de estudiar, describir y recoger las complicaciones relacionadas y derivadas de la utilización de dispositivos implantables de carácter permanente, tipo Port-A-Cath (PAC), en pacientes oncológicos. Durante las últimas décadas, estos dispositivos han experimentado una evolución tecnológica importante de manera que actualmente permiten su utilización de forma repetida, en régimen ambulatorio y para diferentes aplicaciones médicas, (administración de nutrición...

  3. Reservorios venosos centrales totalmente implantables, tipo Port-A-Cath, en pacientes oncológicos: Revisión de Complicaciones Totally implantable central venous devices (Port-A-Cath in oncological patients: Review of complications

    Directory of Open Access Journals (Sweden)

    E. Freiré

    2008-10-01

    Full Text Available El objetivo de esta revisión fue la de estudiar, describir y recoger las complicaciones relacionadas y derivadas de la utilización de dispositivos implantables de carácter permanente, tipo Port-A-Cath (PAC, en pacientes oncológicos. Durante las últimas décadas, estos dispositivos han experimentado una evolución tecnológica importante de manera que actualmente permiten su utilización de forma repetida, en régimen ambulatorio y para diferentes aplicaciones médicas, (administración de nutrición parenteral, administración de medicamentos o para la simple extracción de muestras sanguíneas. Gracias a esta evolución tecnológica, se ha incrementado la calidad de vida de los pacientes tanto por la mayor facilidad de utilización, como en la reducción del número de ingresos hospitalarios, mejorando así su balance coste/beneficio. Al igual que en cualquier otra técnica médico-quirúrgica, no están exentos de complicaciones derivadas bien del implante, utilización o mantenimiento en el tiempo de estos dispositivos y que es objeto principal de nuestra revisión. Consideramos necesario realizar esta revisión como control interno de las complicaciones surgidas así como herramienta de vigilancia sobre la técnica de implante y en relación con una apreciación subjetiva del incremento de las complicaciones de carácter trombótico en nuestra serie. Mostramos como la estandarización de la técnica de implante y la unificación de criterios a la hora de realizar el mantenimiento de los mismos por parte de los equipos de enfermería parece que reduce el número de complicaciones. Revisada la bibliografía, hemos constatado que nuestras cifras se presentan como buenas o muy buenas en el rango de las complicaciones advertidas y contabilizadas en una revisión de 473 historias clínicas de pacientes oncológicos tratados con fármacos quimioterápicos a través de este tipo de dispositivos.This review, describe and depict the complications

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

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    Rosemeire A. Mendes Lopes

    1993-06-01

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

  5. Calidad de vida y características psicológicas de una población de pacientes hipoacúsicos implantados quirúrgicamente con la Prótesis Totalmente Implantable

    OpenAIRE

    Cortijo Torres, Marta

    2016-01-01

    Valorar la calidad de vida de una población de pacientes que han sido implantados quirúrgicamente con la prótesis totalmente implantable de oído medio, y detectar sintomatología psicopatológica que pudiera suponer un obstáculo para la consecución de resultados en el proceso de adaptación al implante auditivo.

  6. 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.

  7. Central auditory development in children with cochlear implants: clinical implications.

    Science.gov (United States)

    Sharma, Anu; Dorman, Michael F

    2006-01-01

    A common finding in developmental neurobiology is that stimulation must be delivered to a sensory system within a narrow window of time (a sensitive period) during development in order for that sensory system to develop normally. Experiments with congenitally deaf children have allowed us to establish the existence and time limits of a sensitive period for the development of central auditory pathways in humans. Using the latency of cortical auditory evoked potentials (CAEPs) as a measure we have found that central auditory pathways are maximally plastic for a period of about 3.5 years. If the stimulation is delivered within that period CAEP latencies reach age-normal values within 3-6 months after stimulation. However, if stimulation is withheld for more than 7 years, CAEP latencies decrease significantly over a period of approximately 1 month following the onset of stimulation. They then remain constant or change very slowly over months or years. The lack of development of the central auditory system in congenitally deaf children implanted after 7 years is correlated with relatively poor development of speech and language skills [Geers, this vol, pp 50-65]. Animal models suggest that the primary auditory cortex may be functionally decoupled from higher order auditory cortex due to restricted development of inter- and intracortical connections in late-implanted children [Kral and Tillein, this vol, pp 89-108]. Another aspect of plasticity that works against late-implanted children is the reorganization of higher order cortex by other sensory modalities (e.g. vision). The hypothesis of decoupling of primary auditory cortex from higher order auditory cortex in children deprived of sound for a long time may explain the speech perception and oral language learning difficulties of children who receive an implant after the end of the sensitive period. PMID:16891837

  8. Placement of an implantable central venous access device

    International Nuclear Information System (INIS)

    To evaluate the efficacy and safety of placement of a central venous catheter with infusion port into the superior vena cava. Central venous catheters with a infusion port were implanted in 21 patients (M:F=4:17, age range:15-63, mean age: 41) diagnosed as suffering from breast cancer (n=9), lymphoma (n=7), thymoma (n=2) rhabdomyosarcoma(n=2) and rectal cancer (n=1). The per(n=9), lymphoma(n=7), thymoma (n=2) rhabdomyosarcoma (n=2) and rectal cancer (n=1). The peripheral portion of the subclavian vein was punctured under fluoroscopic guidance during injection of contrast media at the site of the ipsilateral peripheral vein (20 cases) and under ultrasonographic guidance (1 case). 9.6F central venous catheters placed in the superior vena cava via the subclavian vein and the connected infusion ports were implanted in the subcutaneous pocket near the puncture site of the right anterosuperior chest wall. Radiologic placement under fluoroscopic guidance of a central venous catheter with a infusion port is easy, safe and useful for patients requiring long-term venous access. (author). 21 refs., 2 figs

  9. Central Vein Dilatation Prior to Concomitant Port Implantation

    International Nuclear Information System (INIS)

    Implantation of subcutaneous port systems is routinely performed in patients requiring repeated long-term infusion therapy. Ultrasound- and fluoroscopy-guided implantation under local anesthesia is broadly established in interventional radiology and has decreased the rate of complications compared to the surgical approach. In addition, interventional radiology offers the unique possibility of simultaneous management of venous occlusion. We present a technique for recanalization of central venous occlusion and angioplasty combined with port placement in a single intervention which we performed in two patients. Surgical port placement was impossible owing to occlusion of the superior vena cava following placement of a cardiac pacemaker and occlusion of multiple central veins due to paraneoplastic coagulopathy, respectively. In both cases the affected vessel segments were dilated with balloon catheters and the port systems were placed thereafter. After successful dilatation, the venous access was secured with a 25-cm-long, 8-Fr introducer sheath, a subcutaneous pocket prepared, and the port catheter tunneled to the venipuncture site. The port catheter was introduced through the sheath with the proximal end connected to a 5-Fr catheter. This catheter was pulled through the tunnel in order to preserve the tunnel and, at the same time, allow safe removal of the long sheath over the wire. The port system functioned well in both cases. The combination of recanalization and port placement in a single intervention is a straightforward alternative for patients with central venous occlusion that can only be offered by interventional radiology.

  10. Testes in vitro e in vivo com o Coração Artificial Auxiliar (CAA: um novo modelo de coração artificial totalmente implantável e heterotópico In vitro and in vivo tests with the Auxiliary Total Artificial Heart (ATAH: a new device of a totally implantable and heterotopic artificial heart

    Directory of Open Access Journals (Sweden)

    Aron ANDRADE

    1999-04-01

    through the change of the left preload, assisting the natural heart in obtaining adequate blood flow. With the miniaturization of this pump, the average sized patient can have the surgical procedure of implantation in the right thoracic cavity performed without removal of the natural heart. The left and right stroke volumes are 35 ml and 32 ml, respectively. In vitro tests were made and the performance curves demonstrated that the ATAH produces 5L/min of cardiac output at 180 bpm (10 mmHg of left inlet mean pressure and 100 mmHg of left outlet mean pressure. Preliminary acute In vivo tests were performed in two sheeps with 50 ± 5 kg, during 5 hours. The ATAH performance is satisfactory for helping the natural heart to obtain the required blood flow and arterial pressure. With the ATAH and the natural heart working simultaneously the ATAH control system is simpler, also the risks of a fatal misoperation is minor compared to a total artificial heart, for patients that still present some cardiac function.

  11. Influence of implant position on clinical crown length and peri-implant soft tissue dimensions at implant-supported single crowns replacing maxillary central incisors

    DEFF Research Database (Denmark)

    Peng, Min; Fei, Wei; Hosseini, Mandana;

    2013-01-01

    The aims of the present study were to evaluate the influence of implant position on clinical crown length and marginal soft tissue dimensions at implant-supported single crowns of maxillary central incisors, and to validate the papilla index score (PIS). Twenty-five patients, who had lost one of ...

  12. Pyoderma gangrenosum after totally implanted central venous access device insertion

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    Hagen Monica E

    2008-03-01

    Full Text Available Abstract Background Pyoderma gangrenosum is an aseptic skin disease. The ulcerative form of pyoderma gangrenosum is characterized by a rapidly progressing painful irregular and undermined bordered necrotic ulcer. The aetiology of pyoderma gangrenosum remains unclear. In about 70% of cases, it is associated with a systemic disorder, most often inflammatory bowel disease, haematological disease or arthritis. In 25–50% of cases, a triggering factor such as recent surgery or trauma is identified. Treatment consists of local and systemic approaches. Systemic steroids are generally used first. If the lesions are refractory, steroids are combined with other immunosuppressive therapy or to antimicrobial agents. Case presentation A 90 years old patient with myelodysplastic syndrome, seeking regular transfusions required totally implanted central venous access device (Port-a-Cath® insertion. Fever and inflammatory skin reaction at the site of insertion developed on the seventh post-operative day, requiring the device's explanation. A rapid progression of the skin lesions evolved into a circular skin necrosis. Intravenous steroid treatment stopped the necrosis' progression. Conclusion Early diagnosis remains the most important step to the successful treatment of pyoderma gangrenosum.

  13. Safety of a Totally Implantable Central Venous Port System with Percutaneous Subclavian Vein Access

    OpenAIRE

    Keum, Dong-Yoon; Kim, Jae-Bum; Chae, Min-Cheol

    2013-01-01

    Background The role of totally implantable central venous port (TICVP) system is increasing. Implantation performed by radiologist with ultrasound-guided access of vein and fluoroscope-guided positioning of catheter is widely accepted nowadays. In this article, we summarized our experience of TICVP system by surgeon and present the success and complication rate of this surgical method. Materials and Methods Between March 2009 and December 2010, 245 ports were implanted in 242 patients by surg...

  14. Tres lecciones en combinatoria algebraica. I. Matrices totalmente no negativas y funciones sim\\'etricas

    OpenAIRE

    Ardila, Federico; Leon, Emerson; Rosas, Mercedes; Skandera, Mark

    2013-01-01

    En esta serie de tres articulos, damos una exposicion de varios resultados y problemas abiertos en tres areas de la combinatoria algebraica y geometrica: las matrices totalmente no negativas, las representaciones del grupo simetrico, y los arreglos de hiperplanos. Esta primera parte presenta una introduccion a las matrices totalmente no negativas, y su relacion con las funciones simetricas. In this series of three articles, we give an exposition of various results and open problems in three a...

  15. Materials directed to implants for repairing Central Nervous System

    Energy Technology Data Exchange (ETDEWEB)

    Canillas, M.; Moreno-Burriel, B.; Chinarro, E.

    2014-07-01

    Central Nervous System (CNS) can be damaged by a wide range of injuries and disorders which entail permanent disability in some cases. Moreover, CNS repairing process presents some complications. The natural repair mechanism, which consists on the glial scar formation, is triggered by the inflammatory process. Molecules delivered during these processes, inflammation and glial scar formation as well as oxygen and glucose deficiencies due to the injury, create an inhibitory environment for axon regeneration and remyelination which is known as secondary injury. Biomaterials are taking up an even more important role in repairing CNS. Physicochemical properties of some ceramic materials have inspired different applications to repair CNS as substrates, electrodes or molecule vehicles. Based on their biocompatibility, capability to neutralize reactive species involved in the inflammatory processes and their versatile processing to obtain scaffolds with different shapes and sizes, ceramics are a succulent offer in nervous tissue engineering. Furthermore, their possibilities have been increased with polymeric-ceramics composites development, which have given rise to new interesting horizon. (Author)

  16. Materials directed to implants for repairing Central Nervous System

    International Nuclear Information System (INIS)

    Central Nervous System (CNS) can be damaged by a wide range of injuries and disorders which entail permanent disability in some cases. Moreover, CNS repairing process presents some complications. The natural repair mechanism, which consists on the glial scar formation, is triggered by the inflammatory process. Molecules delivered during these processes, inflammation and glial scar formation as well as oxygen and glucose deficiencies due to the injury, create an inhibitory environment for axon regeneration and remyelination which is known as secondary injury. Biomaterials are taking up an even more important role in repairing CNS. Physicochemical properties of some ceramic materials have inspired different applications to repair CNS as substrates, electrodes or molecule vehicles. Based on their biocompatibility, capability to neutralize reactive species involved in the inflammatory processes and their versatile processing to obtain scaffolds with different shapes and sizes, ceramics are a succulent offer in nervous tissue engineering. Furthermore, their possibilities have been increased with polymeric-ceramics composites development, which have given rise to new interesting horizon. (Author)

  17. Central Auditory Processing of Temporal and Spectral-Variance Cues in Cochlear Implant Listeners.

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    Carol Q Pham

    Full Text Available Cochlear implant (CI listeners have difficulty understanding speech in complex listening environments. This deficit is thought to be largely due to peripheral encoding problems arising from current spread, which results in wide peripheral filters. In normal hearing (NH listeners, central processing contributes to segregation of speech from competing sounds. We tested the hypothesis that basic central processing abilities are retained in post-lingually deaf CI listeners, but processing is hampered by degraded input from the periphery. In eight CI listeners, we measured auditory nerve compound action potentials to characterize peripheral filters. Then, we measured psychophysical detection thresholds in the presence of multi-electrode maskers placed either inside (peripheral masking or outside (central masking the peripheral filter. This was intended to distinguish peripheral from central contributions to signal detection. Introduction of temporal asynchrony between the signal and masker improved signal detection in both peripheral and central masking conditions for all CI listeners. Randomly varying components of the masker created spectral-variance cues, which seemed to benefit only two out of eight CI listeners. Contrastingly, the spectral-variance cues improved signal detection in all five NH listeners who listened to our CI simulation. Together these results indicate that widened peripheral filters significantly hamper central processing of spectral-variance cues but not of temporal cues in post-lingually deaf CI listeners. As indicated by two CI listeners in our study, however, post-lingually deaf CI listeners may retain some central processing abilities similar to NH listeners.

  18. Replacement of mandibular central incisors with implant-supported crowns: a case report.

    Science.gov (United States)

    Bäumer, Daniel; Zuhr, Otto; Hürzeler, Markus

    2016-01-01

    Anterior teeth are often affected by accidental dental trauma and may eventually be lost. When the neighboring teeth are unharmed, implant-supported crowns are often the preferred treatment choice. When not only the teeth but also the supporting hard and soft tissue has been lost, surgical reconstruction may be needed. However, in combined horizontal and vertical class III defects, the available augmentation techniques are often not predictable. In this case report, two neighboring mandibular central incisors were replaced by two implants after soft and hard tissue augmentation with the cortical bone plate method. The interdental soft tissue was reconstructed with remarkable success, making this an example of what can be achieved in cases such as this. PMID:27092347

  19. Evaluation of the Necessity of Port Fixation in Central Venous Port Implantation

    International Nuclear Information System (INIS)

    The technical success and complications were especially focused on and evaluated the need for fixation of a port under fluoroscopic guidance placement of the totally implantable central venous access ports for long term central venous access. Two hundred eighty nine consecutive patients (170 men, 119 women, mean age: 52-year-old) who underwent venous port implantation for the administration of chemotherapy were followed over a 1-month period. The procedures were performed in the angiographic suite by an interventional radiologist and all access was through the right jugular vein, except for the patients who had undergone a right mastectomy. The procedures were performed in the following order: 1) venous puncture, 2) making a pocket, 3) catheter tunneling, 4) port insertion, 5) catheter sizing, and 6) insertion. A port which was connected to the tunneled catheter was inserted into the minimally sized subcutaneous pocket with the aid of a small retractor. A follow-up was performed with medical records and chest radiographs. The follow-up period for evaluating the venous port ranged from 59 to 329 days (mean: 175 days) The procedures performed to gain right jugular vein access were successful without difficulty in all cases. The 18 patients that underwent procedures to gain left jugular vein access encountered some difficulty upon insertion of a catheter into the SVC due to encountering the tortuous left brachiocephalic vein. No complications occurred during and immediately after the procedure. In one case the port chamber rotated within the subcutaneous pocket; however, no catheter migration or malfunction occurred. If port insertion was followed by catheter insertion, the port chamber can be tightly implanted in the minimally sized pocket. This would avoid the need for fixation of the catheter to the port chamber leading into the pocket

  20. A Comparison of Clinical Outcomes with Regular- and Low-Profile Totally Implanted Central Venous Port Systems

    International Nuclear Information System (INIS)

    The purpose of this study was to evaluate whether low-profile totally implanted central venous port systems can reduce the late complication of skin perforation. Forty patients (age, 57 ± 13 years; 22 females, 18 males) were randomized for the implantation of a low-profile port system, and another 40 patients (age, 61 ± 14 years; 24 females, 16 males) received a regular port system as control group. Indications for port catheter implantation were malignant disease requiring chemotherapy. All port implantations were performed in the angiography suite using sonographically guided central venous puncture and fluoroscopic guidance of the catheter placement. Procedure time, number of complications (procedure-related immediate, early, and late complications), and number of explantations were assessed. Follow-up was performed for 6 months. All port implantations were successfully completed in both study groups. There were two incidents of skin perforation observed in the control group. One skin perforation occurred 13 weeks and the other 16 weeks after port implantation (incidence, 5%) in patients with regular-profile port systems. Two infections were observed, one port infection in each study group. Both infections were characterized as catheter-related infections (infection rate: 0.15 catheter-related infections per 1000 catheter days). In conclusion, low-profile port systems can be placed as safely as traditional chest ports and reduce the risk of developing skin perforations, which occurs when the port system is too tight within the port pocket.

  1. Fracture and atypical migration of an implantable central venous access device.

    Science.gov (United States)

    Mery, Mirela; Palengat, Stéphanie; Loffroy, Romaric; Vernet, Magali; Matet, Pascal; Cherblanc, Violaine

    2016-06-01

    Distal embolization of a fractured indwelling central catheter is a rare complication. The pinch-off syndrome (POS) should be known, prevented and early detected. We present a case in which further radiological exams were required to find the fragmented catheter with an atypical migration, requiring local surgery for removing. After chest and abdominal CT scan, neck X-ray, and heart echography, the catheter was found on the lower limbs X-ray on the internal side of right knee corresponding to a location of saphenous vein. Implanted catheters should be removed after completion of treatment and the integrity of the system should be monitored. To avoid POS, a catheter must be inserted into the subclavian vein as laterally as possible. PMID:27429915

  2. Outcome analysis in 3,160 implantations of radiologically guided placements of totally implantable central venous port systems

    International Nuclear Information System (INIS)

    In this retrospective study the success and complication rates after radiologically guided port catheter implantation were evaluated. Between 2000 and 2008, 3,160 port catheter systems were implanted in our interventional suite. All interventions were imaging guided. The puncture of the preferably right internal jugular vein (IJV) was ultrasound-assisted and the catheter tip position was controlled with fluoroscopy. Catheter indwelling time and rates of periprocedural, early and late complications were evaluated. 922,599 catheter days (mean, 292 days; range, 0-2,704 days) were documented. The implantation was successful in 3,153 (99.8%) cases. A total of 374 (11.8%; 0.41/1,000 catheter days) adverse events were recorded. Of these, 42 (1.33%) were periprocedural complications. 86 (3.3%; 0.09/1,000 catheter days) early and 246 (9.4%; 0.27/1,000 catheter days) late onset complications occurred after port implantation. The most common complications were blood stream infection (n = 134; 5.1%; 0.15/1,000 catheter days), catheter-induced venous thrombosis (n = 97; 3.7%; 0.11/1,000 catheter days) and catheter migration (n = 34; 1.3%; 0.04/1,000 catheter days). A total of 193 (6.1%) port explantations were required. Ultrasound guided port implantation via the IJV results in low periprocedural complication rates. (orig.)

  3. Influence of central panoramic curve deviation of the mandibular image reconstruction in the implant CT

    International Nuclear Information System (INIS)

    The purpose of this study was to investigate an influence of the change of central panoramic curves on the image reconstruction in the dental implant CT. The author designed three experimental groups according to the location of central panoramic curve. In group A, central panoramic curve was determined as the curve connecting the center of roots from the first premolar to the first molar. In group B, central panoramic curve was determined as the line connecting the lingual cortical plate at the level of the mesial aspect of the first premolar with the buccal cortical plate at the level of the mesial aspect of the first molar. In group C, central panoramic curve was determined as the line connecting the buccal cortical plate at the level of the mesial aspect of the first molar. Twenty four reformatted CT images was acquired from four mandibles embedded in the resin block and twenty four contact radiographs of dog specimens were acquired. Each image was processed under Adobe Photoshop program analysed by MSPA (mandible/maxilla shape pattern analysis) variables such as MXVD, MXHD, UHD, MHD, and LHD. The obtained results were as follows ; 1. The mean of MXVD variable was 19.9, 20.2, and 20.0 in group A, B, and C, respectively, which were smaller than actual value 20.5. But, there was no significant difference among 3 groups (p>0.05). 2. The mean of MXHD, UHD, MHD, and LHD variables in group A, B, and C was 11.9, 12.2, and 12.3; 9.3, 9.5, and 9.6; 10.0, 10.3,and 10.3; 9.2, 9.3, and 9.4 respectively which were equal to or greater than the actual value 11.8, 9.3, 10.0. But, there was no significant difference among 3 groups (p>0.05). 3. The number of noneffective observations with difference over or under 1 mm with comparison to the actual value was 24 (20%), 58 (48.3%), and 52 (43.3%), respectively, in group A, B, and C. 4. In group A, the number of observations over 1mm and under 1 mm was 9 and 15, respectively, but in group B and C, the number of observations over 1

  4. Influence of central panoramic curve deviation of the mandibular image reconstruction in the implant CT

    Energy Technology Data Exchange (ETDEWEB)

    Park, Rae Jeong; Lee, Sam Sun; Choi, Soon Chul; Park, Tae Won; You, Dong Soo [Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University, College of Dentistry, Seoul University, Seoul (Korea, Republic of)

    1998-02-15

    The purpose of this study was to investigate an influence of the change of central panoramic curves on the image reconstruction in the dental implant CT. The author designed three experimental groups according to the location of central panoramic curve. In group A, central panoramic curve was determined as the curve connecting the center of roots from the first premolar to the first molar. In group B, central panoramic curve was determined as the line connecting the lingual cortical plate at the level of the mesial aspect of the first premolar with the buccal cortical plate at the level of the mesial aspect of the first molar. In group C, central panoramic curve was determined as the line connecting the buccal cortical plate at the level of the mesial aspect of the first molar. Twenty four reformatted CT images was acquired from four mandibles embedded in the resin block and twenty four contact radiographs of dog specimens were acquired. Each image was processed under Adobe Photoshop program analysed by MSPA (mandible/maxilla shape pattern analysis) variables such as MXVD, MXHD, UHD, MHD, and LHD. The obtained results were as follows: 1. The mean of MXVD variable was 19.9, 20.2, and 20.0 in group A, B, and C, respectively, which were smaller than actual value 20.5. But, there was no significant difference among 3 groups (p>0.05). 2. The mean of MXHD, UHD, MHD, and LHD variables in group A, B, and C was 11.9, 12.2, and 12.3; 9.3, 9.5, and 9.6; 10.0, 10.3,and 10.3; 9.2, 9.3, and 9.4 respectively which were equal to or greater than the actual value 11.8, 9.3, 10.0. But, there was no significant difference among 3 groups (p>0.05). 3. The number of noneffective observations with difference over or under 1 mm with comparison to the actual value was 24 (20%), 58 (48.3%), and 52 (43.3%), respectively, in group A, B, and C. 4. In group A, the number of observations over 1mm and under 1 mm was 9 and 15, respectively, but in group B and C, the number of observations over 1 mm

  5. Treatment of Central Type Lung Cancer by CT Guided Percutaneous Implants of 125I Radioisotopes

    Institute of Scientific and Technical Information of China (English)

    Xiaokun Hu; Mingyou Wang; Zhiguo Yang; Chundong Qiu; Dongfang Lü; Xiaodong Li; Taiyang Zuo

    2005-01-01

    OBJECTIVE To discuss the method, safety and effectiveness of the treatment for central-type carcinoma of the lungs by CT guided percutaneous implants of 125I radioisotopes in tissues.METHODS Twenty-two cases of central-type lung cancer located by plain and /or enhanced CT scans were retrospectively analyzed, among which 18cases were verified pathologically using a CT guided percutaneous puncture and biopsy before treatment. The CT guided treatment was conducted immediately after the pathological results were obtained. The number of the radioisotopes used was seven to 16. The intensities of radioactivity for 125I radioisotopes were 22, 26, 30 and 33 MBq per particle.The total intensity of radioactivity was 181 to 355 MBq. The puncture point was only one. The frequency for adjustment of needling direction was two to five times. The punctures were conducted through the anterior chest wall in eight cases, through the lateral chest wall in eight cases and thruogh the posterior chest wall in six cases. Six of the 22 cases were given intravenous chemotherapy.RESULTS Of the 22 cases, 20 were followed-up for more than one month, 16over two months, ten over three months and three cases for six months. In the 20 cases which were followed-up for one month, the diameters of the tumors were reduced by 50% or more in 18 cases, showed no change in two cases with none showing enlargement. In the 16 cases followed-up for more than two months, the diameters of tumors were reduced by 50% or more in 15cases, one case showed no change and none enlarged. In the ten cases with three months of follow-up, the tumor diameters were diminished by 50%or more in eight cases, showed no change in one case and enlarged in one case. In the three cases followed-up for six months, the diameters of tumors were reduced by 50% or more in all the cases. Of the 22 cases, atelectasis occurred in 12 before therapy. The lungs expanded again in nine cases in the follow-up after treatment. Symptoms after

  6. Results of a Second Year of Therapy with the 12-Month Histrelin Implant for the Treatment of Central Precocious Puberty

    Directory of Open Access Journals (Sweden)

    Samar Rahhal

    2009-01-01

    Full Text Available Background. Gonadotropin releasing hormone analogs (GnRHas are standard of care for central precocious puberty (CPP. The histrelin subcutaneous implant is safe and effective in the treatment of CPP for one year. Objective. The study evaluates a second year of therapy in children with CPP who received a new implant after one year of treatment. Methods. A prospective one-year study following an initial 12-month treatment period was conducted. Results. Thirty-one patients (29 girls aged 7.7±1.5 years received a second implant. Eighteen were naïve to GnRHa therapy at first implantation. Peak LH declined from 0.92±0.58 mIU/mL at 12 months to 0.51±0.33 mIU/mL at 24 months (P < .0001 in naïve subjects, and from 0.74±0.50 mIU/mL at 12 months to 0.45±0.35 mIU/mL at 24 months (P=.0081 in previously treated subjects. Predicted adult height increased by 5.1 cm at 24 months (P=.0001. Minor implant site reactions occurred in 61%, while minor difficulties with explantation occurred in 32.2% of subjects. Conclusion. The histrelin implant demonstrates profound hypothalamic-pituitary-gonadal axis suppression when a new implant is placed for a second year of treatment. Prospective follow-up of this therapeutic modality for the treatment of CPP is needed.

  7. Considerations regarding tax optimization in implanted multinational enterprises through external growth for the automobile industry in Central Eastern Europe

    OpenAIRE

    Nitu Antonie Renata; Feder Emoke Szidonia

    2008-01-01

    The business strategy of multinational enterprises (MNEs) from the automobile industry implanted in Central-Eastern European (CEE) countries (Poland, Czech Republic and Romania) is an offensive one, global from operational perspective. Mainly it aims the extension of market share through horizontal growth, generally external type single-domain (Mergers and Acquisitions) and internal type (Greenfield investments) in a lower degree. These enterprises put in practice also a defending strategy fo...

  8. Evaluation of radioactive seeds implantation under PET-CT guidance for the treatment of central lung cancer with obstructive atelectasis

    International Nuclear Information System (INIS)

    Objective: To evaluate percutaneous puncturing 125I seed implantation by using PET-CT guided target localization technique in treating central lung cancer complicated by obstructive pulmonary atelectasis. Methods: A total of 30 patients with suspected central lung cancer complicated by obstructive pulmonary atelectasis on preoperative chest films were enrolled in this study. As no clear distinction existed between the tumor and the atelectatic consolidation shadow on plain chest films, CT scanning was carried out in all patients. If CT scan was still not able to determine the margin of the tumor, an additional PET-CT scanning was adopted. After ascertaining the location of the lung cancer, percutaneous puncturing implantation of 125I seeds under PET-CT guidance was performed. The clinical data and the therapeutic results were evaluated. Results: A sharp distinction between the tumor and the atelectatic consolidation shadow was demonstrated on PET-CT scans in 21 cases. The mean volume of the targeted lesion reckoned from PET-CT scans was 26 cm3, and the 125I seeds were implanted. The mean volume of the targeted lesion calculated on CT scans was 37 cm3. Six months after the treatment, the follow-up CT exam showed that the effective rate was 93% (28/30). The one-year survival rate was 100% . The complications included pneumothorax (n = 8), small amount of hemoptysis (n = 12) and fever (n = 2). No displacement or immigration of the implanted seeds occurred. Conclusion: PET-CT scanning is far superior to conventional CT scanning in determining the target area of the tumor in patients with central lung cancer complicated by obstructive pulmonary atelectasis. (authors)

  9. Percutaneous retrieval of dislodged totally implantable central venous access system in 92 cases: Experience in a single hospital

    International Nuclear Information System (INIS)

    Objective: To investigate the clinical presentation of dislodged totally implantable central venous access system (central venous port-catheter) fragments and the efficacy and safety of percutaneous retrieval of them in our hospital. Materials and methods: Ninety-two cancer patients, mean age of 53.8 years old with 51.1% male, were enrolled from January 2005 to March 2007. They were referred to our catheterization laboratory for retrieval of fractured central venous port-catheter in our hospital. All patients were followed in the outpatient department for at least 1 month after surgical insertion. The characteristics of disrupted central venous port-catheter were recorded. The procedure-related clinical condition was evaluated. Results: The most common presentation of central venous port-catheter dislodgement is irrigation resistance to infusion (51/92). The most common location of fractured fragments is between superior vena cava and right atrium (i.e. proximal end remained in superior vena cava and distal end in right atrium) (22/92). The most common fracture site of the catheter is at the anastomosis between injection port and catheter (77/92). The retrieval set used mostly is loop snare. The success rate of the percutaneous retrieval of dislodged fragment was 97.8% and the complication rate was 3.3% only. Conclusion: The faulty connection between catheter and injection port contributes mainly to dislodgement of central venous port-catheter. Percutaneous retrieval of dislodged catheter is a highly successful, safe and efficient method

  10. Hematologic patients' clinical and psychosocial experiences with implanted long-term central venous catheter

    DEFF Research Database (Denmark)

    Møller, Tom; Adamsen, Lis

    2010-01-01

    A significant decrease in catheter-related infections was demonstrated in our earlier randomized controlled trial of central venous catheter (CVC) care in hematologic patients.......A significant decrease in catheter-related infections was demonstrated in our earlier randomized controlled trial of central venous catheter (CVC) care in hematologic patients....

  11. Histomorphometric analysis of inflammatory response and necrosis in re-implanted central incisor of rats treated with low-level laser therapy

    OpenAIRE

    Vilela, Rianne Gomes; Gjerde, Kjersti; Frigo, Lúcio; Leal Junior, Ernesto Cesar Pinto; Lopes-Martins, Rodrigo Álvaro Brandão; Kleine, Brígida Mônica; Prokopowitsch, Igor

    2011-01-01

    Low-level laser therapy is a tool employed in the management of post-operative inflammation process and in the enhancement of reparative process. The aim of the study was to perform histological evaluation of dental and periodontal ligament of rats central upper-left incisor teeth re-implanted and irradiated with low-level laser (InGaAl, 685 nm, 50 J/cm2) 15, 30, and 60 days after re-implantation. Seventy-two male rats had the central upper left incisor removed and kept for 15 min on dry gauz...

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

    Directory of Open Access Journals (Sweden)

    Webster, Jacqueline et al.

    2005-01-01

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

  13. Considerations regarding tax optimization in implanted multinational enterprises through external growth for the automobile industry in Central Eastern Europe

    Directory of Open Access Journals (Sweden)

    Nitu Antonie Renata

    2008-04-01

    Full Text Available The business strategy of multinational enterprises (MNEs from the automobile industry implanted in Central-Eastern European (CEE countries (Poland, Czech Republic and Romania is an offensive one, global from operational perspective. Mainly it aims the extension of market share through horizontal growth, generally external type single-domain (Mergers and Acquisitions and internal type (Greenfield investments in a lower degree. These enterprises put in practice also a defending strategy for the owned market shares through increasing the efficiency of the production network at global level. This paper aims to present the less evident aspects of tax optimization of the applied business strategy by implemented MNEs in the automobile industry in CEE, and in this context, the necessity to establish transfer prices in accordance with the OECD recommendations, as an obligation assessed by the tax legislations of the considered countries, but also from the necessity of efficient run of these enterprises.

  14. Case of recurrent Flavimonas oryzihabitans bacteremia associated with an implanted central venous catheter (Port-A-Cath): assessment of clonality by arbitrarily primed PCR.

    OpenAIRE

    Verhasselt, B; Claeys, G; Elaichouni, A; Verschraegen, G; Laureys, G; Vaneechoutte, M

    1995-01-01

    Flavimonas oryzihabitans bacteremias, which occurred immediately after the flushing or use of an implanted central venous catheter (Port-A-Cath) in two patients at the same pediatric ward, were studied by arbitrarily primed PCR. We conclude that the colonization of the Port-A-Cath with F. oryzihabitans described here lasted for several months.

  15. An analysis of reliability and validity of the papilla index score of implant-supported single crowns of maxillary central incisors

    DEFF Research Database (Denmark)

    Peng, Min; Fei, Wei; Hosseini, Mandana;

    2012-01-01

    Objectives: To test the reliability and validity of the papilla index scores of the implant-supported single crowns (ISSCs) of maxillary central incisors. Materials and Methods: Twenty-five patients with 25 ISSCs were included. Two prosthodontists evaluated the papilla index score (PIS) of three ...

  16. Scheme for Creating a Subcutaneous Tunnel to Place an Indwelling Implantable Central Venous Access System in the Forearm

    International Nuclear Information System (INIS)

    We report a method that we have devised in which a secure subcutaneous tunnel is prepared during the placement of an indwelling central venous reservoir in the forearm. Subjects included 69 cases in which a procedure for implanting an indwelling reservoir in the forearm was performed between June 2006 and May 2007. For the subcutaneous tunnel, a 22-G Cathelin needle was advanced from the puncture site, turning toward the subcutaneous pocket side to the deep subcutaneous area. A 14-G Surflo IV catheter was then advanced along the 22-G Cathelin needle from the subcutaneous pocket. With the tip of the 14-G Surflo IV catheter emerging above the skin at the puncture site, the inner needle of the 14-G Surflo IV catheter and the 22-G Cathelin needle were removed. The catheter was passed through the outer 14-G Surflo IV catheter to emerge on the subcutaneous pocket site, then the outer needle of the Surflo catheter was also removed, and a connection to the port was made to create the subcutaneous tunnel. In all 69 cases, the subcutaneous tunnel in the forearm of the nondominant arm was successfully created within a short period of time (100% success rate). No problems were observed due to slack in the catheter until removal of the sutures 1 week later and for 3 months after treatment. With this method, we believe that a subcutaneous tunnel can be prepared in which the contained catheter has minimal freedom of movement, and which minimizes any damage induced by slack in the catheter within the subcutaneous tunnel.

  17. Dental Implants

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    Full Text Available Dental Implants A fuller, more complete smile is within reach. The following information is designed to provide helpful ... whether dental implants are right for your situation. Dental Implants and Roots The key benefit of dental implants ...

  18. 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.

  19. Ultrasound and Fluoroscopy-Guided Placement of Central Venous Ports via Internal Jugular Vein: Retrospective Analysis of 1254 Port Implantations at a Single Center

    International Nuclear Information System (INIS)

    To assess the technical success and complication rates of the radiologic placement of central venous ports via the internal jugular vein. We retrospectively reviewed 1254 central venous ports implanted at our institution between August 2002 and October 2009. All procedures were guided by using ultrasound and fluoroscopy. Catheter maintenance days, technical success rates, peri-procedural, as well as early and late complication rates were evaluated based on the interventional radiologic reports and patient medical records. A total of 433386 catheter maintenance days (mean, 350 days; range 0-1165 days) were recorded. The technical success rate was 99.9% and a total of 61 complications occurred (5%), resulting in a post-procedural complication rate of 0.129 of 1000 catheter days. Among them, peri-procedural complications within 24 hours occurred in five patients (0.4%). There were 56 post-procedural complications including 24 (1.9%, 0.055 of 1000 catheter days) early and 32 (2.6%, 0.074 of 1000 catheter days) late complications including, infection (0.6%, 0.018 of 10000 catheter days), thrombotic malfunction (1.4%, 0.040 of 1000 catheter days), nonthrombotic malfunction (0.9%, 0.025 of 1000 catheter days), venous thrombosis (0.5%, 0.014 of 1000 catheter days), as well as wound problems (1.1%, 0.032 of 1000 catheter days). Thirty six CVPs (3%) were removed due to complications. Bloodstream infections and venous thrombosis were the two main adverse events prolonging hospitalization (mean 13 days and 5 days, respectively). Radiologic placement of a central venous port via the internal jugular vein is safe and efficient as evidenced by its high technical success rate and a very low complication rate.

  20. Dental Implants

    Medline Plus

    Full Text Available Dental Implants A fuller, more complete smile is within reach. The following information is designed to provide ... whether dental implants are right for your situation. Dental Implants and Roots The key benefit of dental ...

  1. Dental Implants

    Science.gov (United States)

    Dental Implants A fuller, more complete smile is within reach. The following information is designed to provide ... whether dental implants are right for your situation. Dental Implants and Roots The key benefit of dental ...

  2. Prótesis implantables de oído medio Implantable prothesis of the middle ear

    OpenAIRE

    Ursula Zelada Bacigalupo

    2006-01-01

    Un importante número de pacientes con hipoacusia requiere de la adaptación de una prótesis auditiva, sin embargo, por distintos motivos, muchos de ellos no se sienten satisfechos con las prótesis auditivas convencionales. Una alternativa para estos pacientes son las prótesis implantables de oído medio, dispositivos electrónicos que se implantan parcial o totalmente mediante un procedimiento quirúrgico en el oído medio y que resuelven en gran medida las incomodidades que aquejan a los usuarios...

  3. Radiological placement of peripheral central venous access ports at the forearm. Technical results and long term outcome in 391 patients; Radiologische Implantation zentralvenoeser Portsysteme am Unterarm. Implantationsergebnisse und Langzeit-Follow-up bei 391 Patienten

    Energy Technology Data Exchange (ETDEWEB)

    Lenhart, M. [Sozialstiftung Bamberg (Germany). Klinik fuer Diagnostische und Interventionelle Radiologie; Schaetzler, S. [Klinikum der Regensburg Univ. (Germany). Inst. fuer Roentgendiagnostik; Manke, C. [Klinikum Fulda (DE). Klinik fuer Diagnostische und Interventionelle Radiologie] (and others)

    2010-01-15

    To retrospectively analyze the technical result and long term outcome of central venous arm ports placed by radiologists. Over a 5-year period, 399 arm ports were implanted by radiologists in 391 patients. The system consists of a low profile titanium chamber and a silicone catheter. Ports were placed at the forearm after puncture of a vein proximally to the elbow under fluoroscopic guidance. In a retrospective analysis the technical results and the long term outcome were evaluated. Complications were documented according to the standards of the society of interventional radiology. In 391 patients a total of 98 633 catheter days were documented (1 - 1325 days, mean 252 days). Primary technical success was 99.25 % (396 / 399) with a 100 % secondary technical success rate. No severe procedural complications, e. g. pneumothorax or severe hemorrhage, were found. A total of 45 complications occurred (11.28 %, 0.45 / 1000 catheter days), including 8 portal pocket infections (27 - 205 days, mean 115 days). Fifteen ports were explanted because of complications. The complication rate corresponds to the data from subclavian ports and is less than the complication rates published in large surgical trials. Implantation of central-venous arm ports by radiologists is safe and minimally invasive. No severe immediate procedural complications occur due to the peripheral implantation site. Long term complication rates are comparable to other studies of radiological or surgical port implantation at different sites. (orig.)

  4. SURGICAL OUTCOME OF TRIPLE PROCEDURE AS PENETRATING KERATOPLASTY WITH EXTRACAPSULAR CATARACT EXTRACTION WITH POSTERIOR CHAMBER INTRAOCULAR LENS IMPLANTATION IN PATIENTS WITH BOTH CENTRAL CORNEAL OPACITY AND ADVANCED CATARACT AT RURAL SET UP

    OpenAIRE

    Shubhangi Nigwekar, Kishor Badhe, Neeta Misra, Surekha Bangal

    2015-01-01

    Purpose: To study the surgical outcome of triple procedure as penetrating keratoplasty (PKP) with conventional extra capsular cataract extraction (ECCE) with posterior chamber intraocular lens (PCIOL) implantation in patients with both central corneal opacity and advanced cataract at rural set up. Introduction: When corneal opacity and cataract present together then well-established and effective triple procedure is indicated. Prognosis for a clear graft is good in triple, as graft endothe...

  5. Herniorrafia inguinal laparoscópica totalmente extraperitoneal: vinte e sete complicações graves após 4565 operações consecutivas

    Directory of Open Access Journals (Sweden)

    Alberto Meyer

    2013-02-01

    Full Text Available OBJETIVO: identificar e avaliar as complicações do tratamento da hérnia inguinal com a colocação de tela totalmente extraperitoneal. MÉTODOS: Foram incluídos, em uma série consecutiva de 4565 reparos de hérnia laparoscópica, pacientes que haviam sido submetidos ao procedimento TEP entre janeiro de 2001 e janeiro de 2011. Os critérios de inclusão foram: diagnóstico com hérnia inguinal sintomática, incluindo recorrência após correção de hérnia inguinal e cirurgia prévia em abdômen inferior e pelve. Todos os pacientes > 18 anos de idade. Pacientes com hérnia encarcerada na urgência foram excluídos do estudo. RESULTADOS: Um total de 4565 hérnias foram incluídas no estudo. Ocorreram 27 complicações graves (0,6%: 12 hemorragias (0,25%, duas lesões da bexiga (0,04%, cinco oclusões (0,11%, quatro perfurações intestinais (0,09%, uma lesão da veia ilíaca (0,02%, uma lesão do nervo femoral (0,02%, duas lesões dos vasos deferentes (0,04% e dois óbitos (0,02% (embolia pulmonar, peritonite. CONCLUSÃO: A taxa de complicações com o procedimento TEP é baixa. Correção de hérnia laparoscópica é uma técnica reprodutível e confiável. Em nossa experiência, existem contraindicações para o procedimento de TEP. A técnica TEP deve ser minuciosa para evitar complicações intraoperatórias (diatermia bipolar. As complicações podem ocorrer mesmo após o cirurgião ter adquirido experiência substancial.

  6. Dental Implants

    Medline Plus

    Full Text Available ... helpful facts so you can make an informed decision as to whether dental implants are right for your situation. Dental Implants and Roots The key benefit of dental implants over other tooth replacement systems is that an implant connects directly to the ...

  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. Dental Implants

    Medline Plus

    Full Text Available ... is lost for the most predictable esthetic outcome. Timeline Replacing a tooth with an implant and a ... months to complete the process . Due to the timeline, dental implants are actually a series of steps; ...

  10. Central venous access through the external jugular vein in children submitted to bone marrow transplantation

    Directory of Open Access Journals (Sweden)

    José Luiz de Godoy

    2005-01-01

    Full Text Available Establishment of long-term central venous access is a sine qua non step for bone marrow transplantation in children. Most frequently, long-term central venous access has been obtained via blind percutaneous cannulation of subclavian and internal jugular veins or via internal jugular vein cutdown. In order to avoid some potential minor and major complications associated with the subclavian or internal jugular approaches, the authors describe an easy, simple and safe method for central venous access through an external jugular vein cutdown that should be of interest to readers involved in the field of bone marrow transplantation. It should be also considered for children as well as adults needing central venous access via an external catheter - or totally implantable port - for reasons other than bone marrow transplantation, such as total parenteral nutrition and administration of chemotherapeutic agents.O estabelecimento de um acesso venoso central de longa duração é uma condição sine qua non para realizar o transplante de medula óssea em crianças. Com frequência, este acesso tem sido obtido através da punção percutânea das veias subclávia e jugular interna ou via dissecção da jugular interna. Com o objetivo de evitar algumas complicações maiores e menores associadas com a subclávia e a jugular interna, os autores descrevem um método simples, fácil e seguro para o acesso venoso central através de dissecção da veia jugular externa. Este método deveria ser de interesse dos leitores envolvidos com o transplante de medula óssea e ser considerado também para crianças e/ou adultos que necessitem de cateter venoso central de longa permanência (externo ou totalmente implantável devido a outras razões, como a nutrição parenteral ou a administração de agentes quimioterápicos.

  11. Restoration of ankle movements with the ActiGait implantable drop foot stimulator: a safe and reliable treatment option for permanent central leg palsy.

    Science.gov (United States)

    Martin, Klaus Daniel; Polanski, Witold Henryk; Schulz, Anne-Kathrin; Jöbges, Michael; Hoff, Hansjoerg; Schackert, Gabriele; Pinzer, Thomas; Sobottka, Stephan B

    2016-01-01

    OBJECT The ActiGait drop foot stimulator is a promising technique for restoration of lost ankle function by an implantable hybrid stimulation system. It allows ankle dorsiflexion by active peroneal nerve stimulation during the swing phase of gait. In this paper the authors report the outcome of the first prospective study on a large number of patients with stroke-related drop foot. METHODS Twenty-seven patients who experienced a stroke and with persisting spastic leg paresis received an implantable ActiGait drop foot stimulator for restoration of ankle movement after successful surface test stimulation. After 3 to 5 weeks, the stimulator was activated, and gait speed, gait endurance, and activation time of the system were evaluated and compared with preoperative gait tests. In addition, patient satisfaction was assessed using a questionnaire. RESULTS Postoperative gait speed significantly improved from 33.9 seconds per 20 meters to 17.9 seconds per 20 meters (p mobility, social participation, and quality of life was confirmed by 89% to 96% of patients. CONCLUSIONS The ActiGait implantable drop foot stimulator improves gait speed, endurance, and quality of life in patients with stroke-related drop foot. Regarding gait speed, the ActiGait system appears to be advantageous compared with foot orthosis or surface stimulation devices. Randomized trials with more patients and longer observation periods are needed to prove the long-term benefit of this device. PMID:26207599

  12. Ion implantation

    International Nuclear Information System (INIS)

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

  13. Testes in vitro e in vivo com o Coração Artificial Auxiliar (CAA): um novo modelo de coração artificial totalmente implantável e heterotópico

    OpenAIRE

    Aron ANDRADE; OHASHI Yukio; Júlio LUCCHI; Denys NICOLOSI; Jarbas J Dinkhuysen; BISCEGLI José; Antônio C. F. ARRUDA; Wagner C. CUNHA; Nosé, Yukihiko

    1999-01-01

    Um novo modelo de coração artificial está sendo desenvolvido e testado em nossos laboratórios, o Coração Artificial Auxiliar (CAA). Este dispositivo foi projetado com dimensões reduzidas para ser implantado em paralelo ao coração natural do paciente, dentro da cavidade torácica direita de forma heterotópica. Foram realizados testes in vitro, em um circuito simulador do sistema circulatório humano, para verificação do desempenho hidrodinâmico do CAA. Os resultados mostraram que o CAA pode forn...

  14. 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...

  15. Dental Implants

    Medline Plus

    Full Text Available ... are lost, it’s not uncommon to suffer from social consequences and poor nutrition. Rebuilding Bone When the ... not a one-day procedure. The implant needs time to properly adhere to the bone and create ...

  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. ASSESSMENT OF IMPROVEMENT IN SPEECH PERCEPTION AND LANGUAGE DEVELOPMENT IN COCHLEAR IMPLANT SURGERY : AN INTERESTING STUDY FROM A TERTIARY CARE HOSPITAL OF CENTRAL INDIA

    Directory of Open Access Journals (Sweden)

    Sunil

    2015-10-01

    Full Text Available Severe to profound prelingual deafness that is either congenital or acquired is estimated to occur in 0.5 to 3 per 1000 live births. This is often associated with early delays in language development, speech perception, socialization and results in lower academic achievement. These de velopmental and behavioral problems are severe as 90 % of children are born to normal patients whereas with deaf parents it is less as they have a mutual communication. After much research in this field the first 22 channel cochlear implant surgery was don e in 1982. The number of prelingually deafened adults seeking cochlear implant is increasing as these individuals can derive substantial benefit, although their performance is poorer than adults with post - lingual deafness. MATERIAL AND METHODS : The present prospective study was conducted in the Department of ENT, Pt. J.N.M. Medical College and Dr. B. R.A.M. Hospital, Raipur (C.G. The subject selected were prelingually deafened individuals who were undergoing post cochlear implant speech therapy in the Depar tment. This study included individuals, who underwent cochlear implant surgery in this Department during the period of July, 2008 to September, 2010 and the age was within 10 years at the time of surgery. The study was designed as a prospective longitudina l analysis to asses functioning of patients, who underwent cochlear implantation. A total 37 cochlear implant surgeries were carried out in Department. Of these 3 cases were outside the age criteria of the present study and another 2 cases were lost in fol low up. Pre - operatively, detailed information of subject including the age, sex and address as well as contact number was collected. Then a General Examination was followed with reference to Built, Nutrition, Pulse, and Blood pressure, Oedema, Cyanosis, Cl ubbing and Citrus. A systemic examination was also performed. A Local Examination with special emphasis to tympanic membrane and any middle ear

  18. SURGICAL OUTCOME OF TRIPLE PROCEDURE AS PENETRATING KERATOPLASTY WITH EXTRACAPSULAR CATARACT EXTRACTION WITH POSTERIOR CHAMBER INTRAOCULAR LENS IMPLANTATION IN PATIENTS WITH BOTH CENTRAL CORNEAL OPACITY AND ADVANCED CATARACT AT RURAL SET UP

    Directory of Open Access Journals (Sweden)

    Shubhangi Nigwekar, Kishor Badhe, Neeta Misra, Surekha Bangal

    2015-10-01

    Full Text Available Purpose: To study the surgical outcome of triple procedure as penetrating keratoplasty (PKP with conventional extra capsular cataract extraction (ECCE with posterior chamber intraocular lens (PCIOL implantation in patients with both central corneal opacity and advanced cataract at rural set up. Introduction: When corneal opacity and cataract present together then well-established and effective triple procedure is indicated. Prognosis for a clear graft is good in triple, as graft endothelium does not touch the hard nucleus which may occur in two steps or sequential surgery. It provides faster visual rehabilitation. Being single step procedure it reduces patient’s hospital stay, postoperative care and follows up visits. Methodology: In this hospital based observational , three years longitudinal study, we studied the surgical outcome of relatively rare one step triple procedure as PKP with conventional ECCE with PCIOL implantation in sulcus or in bag, in patients with both central corneal opacity and advanced cataract at rural set up. The outcome measures included graft clarity on slit lamp, postoperative unaided visual acuity with Snellen’s chart and the occurrence of postoperative complications after taking IEC permission and informed written consent in local language from study patients. Results: Out of 13 study patients mean age was 61.15yrs (Range50-80yrs. Follow up range was 9-34 months. At final follow up 9 patients (69.23% had clear grafts and 61.52% patients gained visual acuity >6/24. Graft failure was the most common post operative complication in 30.76% followed by Posterior capsular opacification (PCO in 15.38% patients which was treated well with YAG laser capsulotomy. Conclusion: Triple procedure gives good results in respect to graft clarity, unaided vision, and faster rehabilitation.

  19. Aspectos sócio-políticos da implantação da Central de Transplantes do Piauí Aspectos socio-políticos de la implantación de la Central de Trasplantes de Piauí Socio-political aspects of the implantation of the Transplant Center of Piauí

    Directory of Open Access Journals (Sweden)

    Adélia Dalva da Silva Oliveira

    2007-08-01

    Full Text Available Estudo qualitativo objetivando compreender os aspectos sócio-políticos que mediaram a implantação da central de transplante do Piauí, identificar os sujeitos sociais envolvidos nessa implantação e analisar a participação da sociedade civil organizada. Fizeram parte do estudo dez sujeitos diretamente relacionados com a implantação da central, sendo delimitados por meio da técnica de "bola-de-neve". Utilizou-se a entrevista semi-estruturada, gravada, transcrita e submetida à análise temática. Concluiu-se que, a implantação da central de transplante no Piauí, foi fruto de um complexo jogo de negociações e interesses entre Estado e sociedade civil organizada, já que não havia um projeto político para ações na área dos transplantes. Esse distanciamento da responsabilidade da Gestão Pública caracteriza a importância que foi dada a essa implantação.El presente documento es un Estudio cualitativo objetivando comprender los aspectos sociopolíticos que mediaron en la implantación de la Central de Trasplante de Piauí, se propone identificar los sujetos sociales involucrados en esa implantación y analizar la participación de la sociedad civil organizada. Hicieron parte del estudio diez sujetos directamente relacionados con la implantación de la central de trasplante, siendo delimitados a través de la técnica de "bola-de-nieve". Se utilizó la entrevista semi-estructurada, grabada, transcrita y sometida al análisis temático. Se concluyó que la implantación de la central de trasplante en Piauí, fue fruto de un complejo juego de negociaciones e intereses entre el Estado y la sociedad civil organizada, ya que no había un proyecto político para acciones en el área de los trasplantes. Ese distanciamiento de la responsabilidad de la Gestión Pública caracteriza la importancia que fue dada a esa implantación.A qualitative study aiming at understanding the socio-political aspects that mediate the implantation of the

  20. 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.

  1. 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 ...

  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. 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 ...

  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. TOTALMENTE DIVERSO”: SAN TOMMASO

    Directory of Open Access Journals (Sweden)

    IOSIF TAMAŞ

    2011-05-01

    Full Text Available In order to synthesize the exploration of above presented ideas, wesuggest the following conclusions: Pope John Paul II cherished Saint Thomas as representing „that eternal novelty of thinking” which brought us close to the ontic space of knowledge, the dynamic principle of which is Being. The climax of this condition would be the moment of embracing the truth, which would trigger that vital necessity for metaphysics. According to the stated objective ofthe necessary and indispensable ratio between reason and faith, we see that Tomas suggested the vision of the objective, transcendent and universal truth. This fact determined Pope John Paul II to appreciate that “passion” for truth. The man of our time must walk again towards the light of this truth. In this sense, Saint Thomas’ philosophy represents the guide above all. Its philosophic importance, meaning that “it is truly the philosophy of Being, and not the philosophy of a simple epiphany”, confirms its aim to provide a constant answerto many of the problems that concerns the human mind: the problems ofknowledge and Being, the problems of speaking and doing, the problems of the world, and the problems related with Man and God.

  7. 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+).

  8. 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.

  9. 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...

  10. Effect of Microgene pSVPoMcat Implantation to Modify Genetically Schwann Cells on Central Conduction Function after Spinal Cord Injury%微基因修饰雪旺氏细胞移植对脊髓损伤中枢传导功能的作用

    Institute of Scientific and Technical Information of China (English)

    陈礼刚; 高立达; 周虎田; 曾凡俊; 毛伯镛; 李讯; 卢敏

    2001-01-01

    Objective To approach the effect of microgene pSVPoMcat to modify genetically Schwann cells (SC) on central conduction functionafter spinal cord injury (SCI) . Method Experimental animals were divided into three groups: the group of microgene pSVPoMcat implanted to genetically modify SC (group A), SC implanted group (group B), and the control group (group C). The cortical somatasensory evoked potentials (CESP) and combined behavioral score (CBS) were continuous monitored from operation second week to twelfth week Result The result showed that the peak latency and peak amplitudes of group A, B have a recovery tendency and it was constant with CBS. Conclusion We concluded that the microgene pSVPoMcat to modify genetically Sc may play a promotion role in recovery of central conduction function after SCI.

  11. Influência do diabete melito nos resultados imediatos do implante de stent coronário: uma análise dos dados da Central Nacional de Intervenções Cardiovasculares (CENIC

    Directory of Open Access Journals (Sweden)

    Moscoso Isaac

    2006-01-01

    Full Text Available OBJETIVO: Avaliar a influência do diabete melito (DM nos resultados imediatos do implante de stent coronário (SC, de acordo com o quadro clínico de apresentação. MÉTODOS: Entre janeiro/1997 e dezembro/2003, segundo a Central Nacional de Intervenções Cardiovasculares (CENIC, 11.874 pacientes diabéticos foram submetidos a implante de SC: 7.386 (62,3% com insuficiência coronária crônica (ICO, 3.142 (26,4%, em síndrome isquêmica instável sem elevação ST (SIASEST e 1.346 (11,3%, com infarto agudo do miocárdio (IAM com supradesnivelamento de ST. Estes grupos foram comparados com 48.103 não-diabéticos: 30.980 (64,5% com ICO, 10.938 (22,7% em SIASEST e 6.185 (12,8% com IAM. RESULTADOS: Os diabéticos apresentaram características clínicas e angiográficas de maior risco. Os diabéticos com ICO apresentaram taxa de eventos adversos semelhantes aos não-diabéticos (0,98% x 0,91%, p=0,5971, porém, os diabéticos em SIASEST e IAM apresentaram maior incidência de eventos: 2,76% x 1,46% (p<0,0001 e 7,87% x 4,1% (p<0,0001, respectivamente. A análise multivariada mostrou o DM como preditor independente de risco para eventos adversos maiores na SIASEST (OR: 1,92 IC: 1,46-2,52 p<0,0001 e no IAM (OR: 2,0 IC: 1,57-2,54 p<=0,0001 e não na ICO (OR: 1,08 IC: 0,83-1,42 p=0,5470. CONCLUSÃO: Os pacientes diabéticos portadores de ICO apresentaram evolução hospitalar semelhante aos não diabéticos, porém, os com SIASEST e IAM demonstraram maior taxa de eventos cardíacos adversos comparados com a população não-diabética.

  12. 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 ...

  13. 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...

  14. 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...

  15. Cortical reorganization in children with cochlear implants.

    Science.gov (United States)

    Gilley, Phillip M; Sharma, Anu; Dorman, Michael F

    2008-11-01

    Congenital deafness leads to atypical organization of the auditory nervous system. However, the extent to which auditory pathways reorganize during deafness is not well understood. We recorded cortical auditory evoked potentials in normal hearing children and in congenitally deaf children fitted with cochlear implants. High-density EEG and source modeling revealed principal activity from auditory cortex in normal hearing and early implanted children. However, children implanted after a critical period of seven years revealed activity from parietotemporal cortex in response to auditory stimulation, demonstrating reorganized cortical pathways. Reorganization of central auditory pathways is limited by the age at which implantation occurs, and may help explain the benefits and limitations of implantation in congenitally deaf children. PMID:18775684

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

    Directory of Open Access Journals (Sweden)

    J. García-Cano

    2010-09-01

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

  17. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... Over the next hour you'll see the implantation of an automated implantable cardiac defibrillator. The surgery ... evening we're going to be discussing the implantation of a defibrillator. It’s a battery-powered implantable ...

  18. Retrograde peri-implantitis.

    Science.gov (United States)

    Mohamed, Jumshad B; Shivakumar, B; Sudarsan, Sabitha; Arun, K V; Kumar, T S S

    2010-01-01

    Retrograde peri-implantitis constitutes an important cause for implant failure. Retrograde peri-implantitis may sometimes prove difficult to identify and hence institution of early treatment may not be possible. This paper presents a report of four cases of (the implant placed developing to) retrograde peri-implantitis. Three of these implants were successfully restored to their fully functional state while one was lost due to extensive damage. The paper highlights the importance of recognizing the etiopathogenic mechanisms, preoperative assessment, and a strong postoperative maintenance protocol to avoid retrograde peri-implant inflammation. PMID:20922082

  19. 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...

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

    Directory of Open Access Journals (Sweden)

    Jesús García-Cano

    2013-01-01

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

  1. Bone reactions at implants subjected to experimental peri-implantitis and static load. A study in the dog

    DEFF Research Database (Denmark)

    Gotfredsen, K; Berglundh, T; Lindhe, J

    2002-01-01

    installed in each quadrant of the mandible. In one side, the implants were designed with a SLA surface and in the contralateral side with a turned surface. A plaque control program was initiated. 12 weeks later, the central and posterior implants were connected with an appliance containing an expansion...

  2. Group D. Initiator paper. Implants--peri-implant (hard and soft tissue) interactions in health and disease: the impact of explosion of implant manufacturers.

    Science.gov (United States)

    Ivanovski, Saso

    2015-01-01

    1. The best-documented implants have a threaded solid screw-type design and are manufactured from commercially pure (grade IV) titanium. There is good evidence to support implants ≥ 6 mm in length, and ≥ 3 mm in diameter. 2. Integrity of the seal between the abutment and the implant is important for several reasons, including minimization of mechanical and biological complications and maintaining marginal bone levels. Although the ideal design features of the implant-abutment connection have not been determined, an internal connection, micro-grooves at the implant collar, and horizontal offset of the implant-abutment junction (platform switch) appear to impart favorable properties. 3. Implants with moderately rough implant surfaces provide advantages over machined surfaces in terms of the speed and extent of osseointegration. While the favorable performances of both minimally and moderately rough surfaces are supported by long-term data, moderately rough surfaces provide superior outcomes in compromised sites, such as the posterior maxilla. 4. Although plaque is critical in the progression of peri-implantitis, the disease has a multi-factorial aetiology, and may be influenced by poor integrity of the abutment/implant connection. Iatrogenic factors, such as the introduction of a foreign body. (e.g., cement) below the mucosal margin, can be important contributors. 5. Clinicians should exercise caution when using a particular implant system, ensuring that the implant design is appropriate and supported by scientific evidence. Central to this is access to and participation in quality education on the impact that implant characteristics can have on clinical outcomes. Caution should be exercised in utilizing non-genuine restorative componentry that may lead to a poor implant-abutment fit and subsequent technical and biological complications. PMID:25764593

  3. Milk quality improvement after implantation of good manufacturing practices in milking in 19 cities of the central region of Paraná / Melhoria da qualidade do leite a partir da implantação de boas práticas de higiene na ordenha em 19 municípios da região central do Paraná

    Directory of Open Access Journals (Sweden)

    Livia Cavaletti Corrêa da Silva

    2009-07-01

    Full Text Available The milk production in Brazil presents efficiency and quality problems concerning the raw material, reducing its competitiveness. The poor quality of raw milk is associated with faults in handling and milking hygiene conditions, high indices of mastitis, inadequate maintenance and disinfection of the equipment, inefficient or inexistent refrigeration, disqualified workforce, among others. The aim of this study was to evaluate the efficiency of implantation of simple, inexpensive and easily adopted Good Manufacturing Practices (GMP on dairy farms. Quality parameters researched were total bacterial count (TBC and somatic cell count (SCC, which indicates respectively milking hygiene and mammary gland health. Forty six raw milk samples from 19 cities of the central region of Paraná were analyzed, among them, 32 (69,57% had manual milking and 14 (30,43% mechanic milking. The implantation of GMP resulted in average reduction of 87,90% to TBC on manual milking farms and 86,99% on mechanic milking farms. Regarding SCC, the average reduction was 33,94% in manual milking farms and 51,85% in mechanics milking farms. The implemented practices had shown efficient in all of the studied conditions of production and installations.O setor leiteiro brasileiro apresenta problemas de eficiência produtiva e de qualidade da matéria-prima e, por isso, perde em competitividade. A má qualidade do leite cru está relacionada a fatores como deficiências no manejo e higiene da ordenha, índices elevados de mastite, manutenção e desinfecção inadequadas dos equipamentos, refrigeração ineficiente ou inexistente e mão de obra desqualificada, entre outros. O objetivo deste trabalho foi avaliar a eficiência da implantação de Boas Práticas na ordenha na ordenha, simples e baratas, que pudessem ser facilmente introduzidas pelos produtores de leite. Os parâmetros de qualidade considerados foram a contagem de células somáticas (CCS, indicativo de sanidade da gl

  4. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... discussing the implantation of a defibrillator. It’s a battery-powered implantable device that saves patients from deadly ... next doctor or whoever come to replace the battery and then to change the generator, they cannot -- ...

  5. 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. ...

  6. 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 ...

  7. 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- ...

  8. 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 ...

  9. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... quality healthcare for all patients. "OR Live" makes it easy for you to learn more. Just click ... to be discussing the implantation of a defibrillator. It’s a battery-powered implantable device that saves patients ...

  10. 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

  11. 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...... evaluating bone-implant fixation with HA coatings....

  12. Implantation of Hickman catheters

    International Nuclear Information System (INIS)

    Hickmann catheters are used mainly in patients with hematologic diseases, especially lymphatic and myelotic leukemias, and malignant lymphomas. They facilitate the administration of chemotherapeutics, hyperosmolar solutions and other substances with local toxicity as well as frequent taking of blood samples. Usually Hickmann catheters are placed by surgical cutdown on a jugular vein. In lieu of this surgical placement, we recommend the implantation of Hickman catheters by means of interventional radiology techniques. In a period of 13 months 78 Hickman catheters were placed in 67 patients. 37 catheters (=47%) stayed more than one month, 8 catheters (=10%) stayed 5 to 8 months in the central venous system. 26, respectively 6, of these catheters are until now in situ. Lethal or life threatening complications did not occur. There were no infections at the introduction site of the catheter. The main complications were: Pneumothorax without drainage: 3.2%, pneumothorax with drainage: 3.2%, slipping back of the tip of the catheter: 4.8%, thrombosis of the subclavian vein: 3.2%, fluid in the pleural cavity: 1.6%. In correspondance to the literature the complications of Hickman catheter placement by means of interventional radiology are less serious than by means of surgical cutdown. Further advantages are: General anesthesia can be avoided (less strain on severely ill patients, no problems to wean from assisted ventilation in patients with respiratory insufficiency), the smooth curve of the implanted catheter avoids sharp kinking and occlusion of the lumen, very small skin incisions are sufficient (lesser risk of hematomas in patients with thrombopenia), time and cost are reduced in comparison to surgical placement. (orig.)

  13. 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.

  14. 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 ...

  15. 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.

  16. Short-term and long-term outcome of radiological-guided insertion of central venous access port devices implanted at the forearm: a retrospective monocenter analysis in 1704 patients

    International Nuclear Information System (INIS)

    The objectives are to analyze the technical success rate as well as the short-term and long-term complications of totally implantable venous access ports (TIVAPs) at the forearm. Retrospective analysis of 1,704 consecutively implanted TIVAPs was performed. Primary endpoints were defined as technical success rate, clinical outcome, device service interval, and rates of major complications. Minor complications not requiring port explantation were defined as secondary endpoints. The technical success rate was 99.2 % with no major complications. During follow-up, a total of 643,200 catheter-days were documented, the mean device service interval was 380.6 days/patient. A total of 243 complications (14.4 %) in 226 patients were observed (0.4/1000 catheter-days), in 140 patients (8.3 %) the port device had to be explanted. Disconnection between the port device and the catheter (1.6 %) was more frequent than fracture (0.8 %) and leakage (0.6 %) of the catheter, which occurred more frequently when the catheter was inserted via the cephalic versus the brachial vein. TIVAP implantation at the forearm is a simple and safe procedure with a low rate of early and late complications. (orig.)

  17. Short-term and long-term outcome of radiological-guided insertion of central venous access port devices implanted at the forearm: a retrospective monocenter analysis in 1704 patients

    Energy Technology Data Exchange (ETDEWEB)

    Wildgruber, Moritz; Borgmeyer, Sebastian; Gaa, Jochen; Meier, Reinhard; Berger, Hermann [Technische Universitaet Muenchen, Division of Interventional Radiology, Department of Radiology, Klinikum Rechts der Isar, Muenchen (Germany); Haller, Bernhard [Technische Universitaet Muenchen, Department of Medical Statistics and Epidemiology, Klinikum Rechts der Isar, Munich (Germany); Jansen, Heike; Kiechle, Marion; Ettl, Johannes [Technische Universitaet Muenchen, Department of Obstetrics and Gynecology, Klinikum Rechts der Isar, Munich (Germany)

    2014-09-20

    The objectives are to analyze the technical success rate as well as the short-term and long-term complications of totally implantable venous access ports (TIVAPs) at the forearm. Retrospective analysis of 1,704 consecutively implanted TIVAPs was performed. Primary endpoints were defined as technical success rate, clinical outcome, device service interval, and rates of major complications. Minor complications not requiring port explantation were defined as secondary endpoints. The technical success rate was 99.2 % with no major complications. During follow-up, a total of 643,200 catheter-days were documented, the mean device service interval was 380.6 days/patient. A total of 243 complications (14.4 %) in 226 patients were observed (0.4/1000 catheter-days), in 140 patients (8.3 %) the port device had to be explanted. Disconnection between the port device and the catheter (1.6 %) was more frequent than fracture (0.8 %) and leakage (0.6 %) of the catheter, which occurred more frequently when the catheter was inserted via the cephalic versus the brachial vein. TIVAP implantation at the forearm is a simple and safe procedure with a low rate of early and late complications. (orig.)

  18. 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...

  19. Implants in adolescents

    Directory of Open Access Journals (Sweden)

    Rohit A Shah

    2013-01-01

    Full Text Available Implants have gained tremendous popularity as a treatment modality for replacement of missing teeth in adults. There is extensive research present on the use of implants in adults, but there is a dearth of data available on the same in adolescents. The treatment planning and execution of implant placement in adolescents is still in its infancy. This review article is an attempt to bring together available literature.

  20. Implants in adolescents

    Science.gov (United States)

    Shah, Rohit A.; Mitra, Dipika K.; Rodrigues, Silvia V.; Pathare, Pragalbha N.; Podar, Rajesh S.; Vijayakar, Harshad N.

    2013-01-01

    Implants have gained tremendous popularity as a treatment modality for replacement of missing teeth in adults. There is extensive research present on the use of implants in adults, but there is a dearth of data available on the same in adolescents. The treatment planning and execution of implant placement in adolescents is still in its infancy. This review article is an attempt to bring together available literature. PMID:24174743

  1. Implants in adolescents

    OpenAIRE

    Shah, Rohit A.; Dipika K Mitra; Rodrigues, Silvia V.; Pathare, Pragalbha N.; Podar, Rajesh S.; Vijayakar, Harshad N.

    2013-01-01

    Implants have gained tremendous popularity as a treatment modality for replacement of missing teeth in adults. There is extensive research present on the use of implants in adults, but there is a dearth of data available on the same in adolescents. The treatment planning and execution of implant placement in adolescents is still in its infancy. This review article is an attempt to bring together available literature.

  2. Maintenance in dental implants

    OpenAIRE

    Giselle Póvoa Gomes; Ronaldo Mendes Assis Lucena; Patrícia Barcelos Bastos; José Bernardes das Neves

    2008-01-01

    In implants, maintenance is a decisive factor for obtaining success when implant supported overdentures and dentures are used. The present stud presents, a clinical case of a patient, a 70 year-old white man, with a completely edentulous mandibular alveolar ridge, severe bone resorption with presence of basal bone only, and absence of vestibule. Initially, treatment consisted of the placement of a mandibular overdenture, supported on three implants in the anterior inter-foramen region, as the...

  3. Trends in Cochlear Implants

    OpenAIRE

    Zeng, Fan-Gang

    2004-01-01

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

  4. 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

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. Implants in the hand; Implantate der Hand

    Energy Technology Data Exchange (ETDEWEB)

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

    2006-09-15

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

  10. Smoking and dental implants

    OpenAIRE

    Kasat, V.; Ladda, R

    2012-01-01

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

  11. Bioceramics for implant coatings

    Directory of Open Access Journals (Sweden)

    Allison A Campbell

    2003-11-01

    Early research in this field focused on understanding the biomechanical properties of metal implants, but recent work has turned toward improving the biological properties of these devices. This has led to the introduction of calcium phosphate (CaP bioceramics as a bioactive interface between the bulk metal impart and the surrounding tissue. The first CaP coatings were produced via vapor phase processes, but more recently solution-based and biomimetic methods have emerged. While each approach has its own intrinsic materials and biological properties, in general CaP coatings promise to improve implant biocompatibility and ultimately implant longevity.

  12. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available Automatic Implantable Cardiac Defibrillator February 19, 2009 Halifax Health Medical Center, Daytona Beach, FL Welcome to Halifax Health Daytona Beach, Florida. Over the next hour you' ...

  13. Wireless cortical implantable systems

    CERN Document Server

    Majidzadeh Bafar, Vahid

    2013-01-01

    Wireless Cortical Implantable Systems examines the design for data acquisition and transmission in cortical implants. The first part of the book covers existing system-level cortical implants, as well as future devices. The authors discuss the major constraints in terms of microelectronic integration. The second part of the book focuses on system-level as well as circuit and system level solutions to the development of ultra low-power and low-noise microelectronics for cortical implants. Existing solutions are presented and novel methods and solutions proposed. The third part of the book focuses on the usage of digital impulse radio ultra wide-band transmission as an efficient method to transmit cortically neural recorded data at high data-rate to the outside world. Original architectural and circuit and system solutions are discussed.

  14. 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.

  15. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... rate of infection, how many device, how many experience the implanter has. That's make a different because every case, you learning from every single case. Every patient different. There ...

  16. 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.

  17. Biocompatibility of surgical implants

    Science.gov (United States)

    Kaelble, D. H.

    1979-01-01

    Method of selecting biocompatible materials for surgical implants uses fracture mechanic relationships and surface energies of candidate materials in presence of blood plasma. Technique has been used to characterize 190 materials by parameters that reflect their biocompatibility.

  18. 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....

  19. Ion implantation at elevated temperatures

    International Nuclear Information System (INIS)

    A kinetic model has been developed to investigate the synergistic effects of radiation-enhanced diffusion, radiation-induced segregation and preferential sputtering on the spatial redistribution of implanted solutes during implantation at elevated temperatures. Sample calculations were performed for Al+ and Si+ ions implanted into Ni. With the present model, the influence of various implantation parameters on the evolution of implant concentration profiles could be examined in detail

  20. 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...

  1. Bioceramics for implant coatings

    OpenAIRE

    Allison A Campbell

    2003-01-01

    During the past century, synthetic materials and devices have been developed to the point at which they can be used successfully to replace and/or restore function to diseased or damaged tissues. In the field of orthopedics, the use of metal implants has significantly improved the quality of life for countless individuals. Critical factors for implant success include proper design, material selection, and biocompatibility. Early research in this field focused on understanding the biomechan...

  2. 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

  3. 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.

  4. Quality of life after permanent prostate implant

    International Nuclear Information System (INIS)

    procedure to a friend. Of the patients who had full time employment (38), 96% returned to work after the implant and the majority returned within 5 days. Sexual quality was high in this short follow up after seed implant. 89% of potent patients retained sexual function after implant. 3% noted some discomfort with ejaculation. 12% noticed some decrease in sexual desire. Interestingly, 14% experienced an increase in sexual desire. 79% reported an excellent overall quality of life. Conclusions: While survival is clearly a central goal of treatment for prostate cancer, the nature of this malignancy compels clinical attention to the qualitative content of the patients life after treatment. Permanent prostate implant has a high degree of patient tolerance and patient acceptance. Sexual quality and function are maintained in the majority of patients and they have minimal interruption in their social and economic function. The low morbidity and high quality of life associated with implantation make it a viable treatment option

  5. Musical Methods for Little Digital Ears — Musical Learning with Preschool Cochlear Implant Users

    OpenAIRE

    Petersen, Bjørn; Hardgrove Hansen, Roberta; Beyer, Karen; Mortensen, Malene Vejby; Vuust, Peter

    2010-01-01

    Prelingually deaf children who receive cochlear implants (CI) earlycan successfully develop age-appropriate language skills providedsufficient intervention measures are initiated. However, little isknown about the music perception and enjoyment of these children,though the enhanced development in the central auditory systemin early-implanted children may benefit music processing. Wehypothesized that early-implanted, prelingually deaf children withCI’s, who were exposed to group-oriented music...

  6. [Central auditory prosthesis].

    Science.gov (United States)

    Lenarz, T; Lim, H; Joseph, G; Reuter, G; Lenarz, M

    2009-06-01

    Deaf patients with severe sensory hearing loss can benefit from a cochlear implant (CI), which stimulates the auditory nerve fibers. However, patients who do not have an intact auditory nerve cannot benefit from a CI. The majority of these patients are neurofibromatosis type 2 (NF2) patients who developed neural deafness due to growth or surgical removal of a bilateral acoustic neuroma. The only current solution is the auditory brainstem implant (ABI), which stimulates the surface of the cochlear nucleus in the brainstem. Although the ABI provides improvement in environmental awareness and lip-reading capabilities, only a few NF2 patients have achieved some limited open set speech perception. In the search for alternative procedures our research group in collaboration with Cochlear Ltd. (Australia) developed a human prototype auditory midbrain implant (AMI), which is designed to electrically stimulate the inferior colliculus (IC). The IC has the potential as a new target for an auditory prosthesis as it provides access to neural projections necessary for speech perception as well as a systematic map of spectral information. In this paper the present status of research and development in the field of central auditory prostheses is presented with respect to technology, surgical technique and hearing results as well as the background concepts of ABI and AMI. PMID:19517084

  7. 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

  8. Long-term venous access using a subcutaneous implantable drug delivery system.

    OpenAIRE

    Soo, K. C.; Davidson, T I; Selby, P; Westbury, G

    1985-01-01

    To facilitate long-term venous access in patients receiving chemotherapy, a subcutaneous totally implantable system (Port-a-Cath, Phamacia) has been used in 14 patients. The method of implantation and the advantages over conventional central venous catheters are discussed. The expense of the system necessitates careful patient selection.

  9. 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

  10. 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...

  11. Experimental research of covered stent implanted in canine hepatic artery

    International Nuclear Information System (INIS)

    Objective: To evaluate the feasibility of success rate of implantation, post-procedure stenosis rate, apposition ability and endothelialization level, etc. for implantation with balloon-expandable covered stent in canine hepatic artery. Methods: 8 adult canines were implanted with balloon-expendable stents covered by expandable poly Teflon ester membrane (e-PTFEM). Follow-up DSA was performed immediately, 2, 4 and 12 wk after the procedure. The canines were sacrificed for histopathologic examination and statistical analysis with correlation of implantation manenvor and angiographic manifestations. Results: 8 cases were all implanted with the covered stents in proper hepatic artery/right hepatic artery successfully; showing good apposition ability and non-opacification of the separated branches. 2 cases showed intraluminal obvious stenosis( > 50%)of the stent at 2 weeks follow-up, so did 3 cases at 12 weeks follow-up, and the total stenosis rate was 37.5% and 5 cases manifested full endothelialization (3 different locations of the sample all manifested full endothelialization), 3 cased manifested partial endothelialization (at least 1 location of the sample didn't show full endothelialization), and the two terminal parts were easier to get endothelialization than the central part. Before and after the stent implantation, hepatic function of all cases didn't demonstrate any obvious changes. Conclusions: Balloon-expandable covered stent can be implanted in canine hepatic artery. successfully, with good apposition ability, full endothelialization, and no influence on hepatic function. (authors)

  12. Difficulties in Cochlear Implantation

    OpenAIRE

    Santa Cruz Ruiz, Santiago; Batuecas Caletrío, Ángel; Santa Cruz Ruiz, Paloma

    2014-01-01

    [ES] Introducción y objetivo: Tras 25 años de experiencia distinguimos dos grupos de pacientes frente a la cirugía de implante coclear, en función de la dificultad de los casos. Discusión: Presentamos diferentes situaciones de patología de oído medio, malformación de oído interno y neuropatías, que suponen una dificultad en esta cirugía. Conclusiones: Aconsejamos derivar a centros experimentados en casos difíciles de implante coclear los casos complejos. [EN] Introductio...

  13. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

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

    2011-01-01

    -stage procedures. From the Danish Registry for Plastic Surgery of the Breast, which has prospectively registered data for women undergoing breast implantations since 1999, we identified 559 women without a history of radiation therapy undergoing 592 delayed breast reconstructions following breast cancer during the......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...

  14. Optimization of dental implant treatment

    OpenAIRE

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

    2016-01-01

    Aim ― Modern dentistry cannot exist without dental implantation. The lifetime of the installed implants depends on condition of the bone and on the quality of the treatment planning and surgery technique. Usually, complications during the implant treatment are related to the inability to accurately predict the condition and location of intraosseous structure that entails the selection of the wrong type of implant and installation position. Methods ― This work is devoted to the "bone-implan...

  15. 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...

  16. Osseointegration of Immediate Transalveolar Implants

    OpenAIRE

    Yoel González Beriau; Eduardo Enrique Castillo Betancourt; Bienvenido Mesa Reinaldo

    2016-01-01

    Background: osseointegration is critical to start prosthetic rehabilitation. Objective: to describe osseointegration of immediate transalveolar implants. Methods: a prospective case series study was conducted from January 2012 to December 2013. It included all patients (75 patients with 79 implants) who attended the Prosthodontics service. Age, sex, osseointegration, cause of tooth loss, region of the implant, specific tooth, bone level and keratinized gingiva around the implant, were the var...

  17. 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

  18. Untreated silicone breast implant rupture

    DEFF Research Database (Denmark)

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

    2004-01-01

    Implant rupture is a well-known complication of breast implant surgery that can pass unnoticed by both patient and physician. To date, no prospective study has addressed the possible health implications of silicone breast implant rupture. The aim of the present study was to evaluate whether untre...

  19. Comparison of Dimensional Accuracy between Open-Tray and Closed-Tray Implant Impression Technique in 15° Angled Implants

    Directory of Open Access Journals (Sweden)

    Balouch F.

    2013-09-01

    Full Text Available Statement of Problem: Various impression techniques have different effects on the accuracy of final cast dimensions. Meanwhile; there are some controversies about the best technique. Purpose: This study was performed to compare two kinds of implant impression methods (open tray and closed tray on 15 degree angled implants.Materials and Method: In this experimental study, a steel model with 8 cm in diameter and 3 cm in height were produced with 3 holes devised inside to stabilize 3 implants. The central implant was straight and the other two implants were 15° angled. The two angled implants had 5 cm distance from each other and 3.5 cm from the central implant. Dental stone, high strength (type IV was used for the main casts. Impression trays were filled with poly ether, and then the two impression techniques (open tray and closed tray were compared. To evaluate positions of the implants, each cast was analyzed by CMM device in 3 dimensions (x,y,z. Differences in the measurements obtained from final casts and laboratory model were analyzed using t-Test. Results: The obtained results indicated that closed tray impression technique was significantly different in dimensional accuracy when compared with open tray method. Dimensional changes were 129 ± 37μ and 143.5 ± 43.67μ in closed tray and open tray, while coefficient of variation in closed- tray and open tray were reported to be 27.2% and 30.4%, respectively.Conclusion: Closed impression technique had less dimensional changes in comparison with open tray method, so this study suggests that closed tray impression technique is more accurate.

  20. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... Health’s commitment to provide quality healthcare for all patients. "OR Live" makes it easy for you to ... It’s a battery-powered implantable device that saves patients from deadly arrhythmias in the heart. If at ...

  1. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... they're implanted. And then, depending on the recommendations for that specific device, eventually that goes over ... them say, “I feel so great.” And they travel, they forget to take your -- they stop taking ...

  2. 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.

  3. Semiconductor Ion Implanters

    International Nuclear Information System (INIS)

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

  4. 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.

  5. 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.

  6. Automatic Implantable Cardiac Defibrillator

    Medline Plus

    Full Text Available ... to see tonight the implantation of a very complex, sophisticated device to save people’s lives. But the ... It doesn't require a device that’s this complex to get the heart back into rhythm and ...

  7. Aspectos sócio-políticos da implantação da Central de Transplantes do Piauí Aspectos socio-políticos de la implantación de la Central de Trasplantes de Piauí Socio-political aspects of the implantation of the Transplant Center of Piauí

    OpenAIRE

    Adélia Dalva da Silva Oliveira; Ana Maria Ribeiro dos Santos; Fernanda Cláudia Miranda Amorim; AylaMaria Calixto de Carvalho; JoseneideTeixeira Câmara; Patrícia Maria Gomes de Carvalho

    2007-01-01

    Estudo qualitativo objetivando compreender os aspectos sócio-políticos que mediaram a implantação da central de transplante do Piauí, identificar os sujeitos sociais envolvidos nessa implantação e analisar a participação da sociedade civil organizada. Fizeram parte do estudo dez sujeitos diretamente relacionados com a implantação da central, sendo delimitados por meio da técnica de "bola-de-neve". Utilizou-se a entrevista semi-estruturada, gravada, transcrita e submetida à análise temática. C...

  8. What is the optimal number of implants for removable reconstructions? A systematic review on implant-supported overdentures

    NARCIS (Netherlands)

    Roccuzzo, Mario; Bonino, Francesca; Gaudioso, Luigi; Zwahlen, Marcel; Meijer, Henny J. A.

    2012-01-01

    Objectives The aim of this systematic review was to assess the optimal number of implants for removable reconstructions. Material and methods Medline and The Cochrane Central Register of Controlled Trials were searched and complemented by hand searching. All trials published in English to October 20

  9. Prosthodontic management of implant therapy.

    Science.gov (United States)

    Thalji, Ghadeer; Bryington, Matthew; De Kok, Ingeborg J; Cooper, Lyndon F

    2014-01-01

    Implant-supported dental restorations can be screw-retained, cement-retained, or a combination of both, whereby a metal superstructure is screwed to the implants and crowns are individually cemented to the metal frame. Each treatment modality has advantages and disadvantages. The use of computer-aided design/computer-assisted manufacture technologies for the manufacture of implant superstructures has proved to be advantageous in the quality of materials, precision of the milled superstructures, and passive fit. Maintenance and recall evaluations are an essential component of implant therapy. The longevity of implant restorations is limited by their biological and prosthetic maintenance requirements. PMID:24286654

  10. Correction of Malpositioned Implants through Periodontal Surgery and Prosthetic Rehabilitation Using Angled Abutment.

    Science.gov (United States)

    de Avila, Erica Dorigatti; de Molon, Rafael Scaf; de Barros-Filho, Luiz Antônio Borelli; de Andrade, Marcelo Ferrarezi; Mollo, Francisco de Assis; de Barros, Luiz Antônio Borelli

    2014-01-01

    When dental implants are malpositioned in relation to the adjacent teeth and alveolar bone or in an excessive buccal or lingual position, the final prosthesis rehabilitation impairs the peri-implant health of the gingival tissues and the aesthetics of the patient. Thus, the purpose of this case was to report and discuss a multidisciplinary protocol for the treatment of a compromised maxillary tooth in a patient with an abscess in his right central incisor due to an excessive buccal implant position. The patient presented with an implant-supported provisional restoration on his right maxillary central incisor and a traumatic injury in his left central incisor. The treatment protocol consisted in (i) abutment substitution to compensate the incorrect angulation of the implant, (ii) clinical crown lengthening, (iii) atraumatic extraction of the left central incisor, and (iv) immediate implant placement. Finally, (v) a custom abutment was fabricated to obtain a harmonious gingival contour around the prosthetic crown. In conclusion, when implants are incorrectly positioned in relation to the adjacent teeth, associated with soft-tissue defects, the challenge to create a harmonious mucogingival contours may be achieved with an interdisciplinary approach and with the placement of an appropriate custom abutment. PMID:24955259

  11. Correction of Malpositioned Implants through Periodontal Surgery and Prosthetic Rehabilitation Using Angled Abutment

    Directory of Open Access Journals (Sweden)

    Érica Dorigatti de Avila

    2014-01-01

    Full Text Available When dental implants are malpositioned in relation to the adjacent teeth and alveolar bone or in an excessive buccal or lingual position, the final prosthesis rehabilitation impairs the peri-implant health of the gingival tissues and the aesthetics of the patient. Thus, the purpose of this case was to report and discuss a multidisciplinary protocol for the treatment of a compromised maxillary tooth in a patient with an abscess in his right central incisor due to an excessive buccal implant position. The patient presented with an implant-supported provisional restoration on his right maxillary central incisor and a traumatic injury in his left central incisor. The treatment protocol consisted in (i abutment substitution to compensate the incorrect angulation of the implant, (ii clinical crown lengthening, (iii atraumatic extraction of the left central incisor, and (iv immediate implant placement. Finally, (v a custom abutment was fabricated to obtain a harmonious gingival contour around the prosthetic crown. In conclusion, when implants are incorrectly positioned in relation to the adjacent teeth, associated with soft-tissue defects, the challenge to create a harmonious mucogingival contours may be achieved with an interdisciplinary approach and with the placement of an appropriate custom abutment.

  12. 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...

  13. Hormonal control of implantation.

    Science.gov (United States)

    Sandra, Olivier

    2016-06-01

    In mammals, implantation represents a key step of pregnancy and its progression conditions not only the success of pregnancy but health of the offspring. Implantation requires a complex and specific uterine tissue, the endometrium, whose biological functions are tightly regulated by numerous signals, including steroids and polypeptide hormones. Endometrial tissue is endowed with dynamic properties that associate its ability to control the developmental trajectory of the embryo (driver property) and its ability to react to embryos displaying distinct capacities to develop to term (sensor property). Since dynamical properties of the endometrium can be affected by pre- and post-conceptional environment, determining how maternal hormonal signals and their biological actions are affected by environmental factors (e.g. nutrition, stress, infections) is mandatory to reduce or even to prevent their detrimental effects on endometrial physiology in order to preserve the optimal functionality of this tissue. PMID:27172870

  14. Study of ICT implanter

    International Nuclear Information System (INIS)

    A compact new low cost ion implantation facility using an ICT (insulated core type) high voltage supply and capable of handling beam currents upto 10 mA is described. Following a systematic investigation of the numerous parameters of the ion implanter, a practical method has been developed for controlling them and to optimise the performance of the machine. Relationship between beam divergence and the extraction parameters has been found. With this machine a stable and typical operation, using 15 mil cathode, yields of 2 μA of boron, 4 μA of argon and 2.5 μA of antimony have been found on the target using B2O3 + Sb (powdered mix) solid feed and argon as support gas. (author)

  15. Efter cochlear implant

    DEFF Research Database (Denmark)

    Højen, Anders

    2007-01-01

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

  16. Efter cochlear implant

    DEFF Research Database (Denmark)

    Højen, Anders

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

  17. A fully implantable rodent neural stimulator

    Science.gov (United States)

    Perry, D. W. J.; Grayden, D. B.; Shepherd, R. K.; Fallon, J. B.

    2012-02-01

    The ability to electrically stimulate neural and other excitable tissues in behaving experimental animals is invaluable for both the development of neural prostheses and basic neurological research. We developed a fully implantable neural stimulator that is able to deliver two channels of intra-cochlear electrical stimulation in the rat. It is powered via a novel omni-directional inductive link and includes an on-board microcontroller with integrated radio link, programmable current sources and switching circuitry to generate charge-balanced biphasic stimulation. We tested the implant in vivo and were able to elicit both neural and behavioural responses. The implants continued to function for up to five months in vivo. While targeted to cochlear stimulation, with appropriate electrode arrays the stimulator is well suited to stimulating other neurons within the peripheral or central nervous systems. Moreover, it includes significant on-board data acquisition and processing capabilities, which could potentially make it a useful platform for telemetry applications, where there is a need to chronically monitor physiological variables in unrestrained animals.

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

    OpenAIRE

    Pâmela Letícia Santos; Jéssica Lemos Gulinelli; Cristino da Silva Telles; Walter Betoni Júnior; Roberta Okamoto; Vivian Chiacchio Buchignani; Thallita Pereira Queiroz

    2013-01-01

    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 immed...

  19. Validation of implant stability: A measure of implant permanence

    OpenAIRE

    Neha Mall; B Dhanasekar; I. N. Aparna

    2011-01-01

    Implant stability is a requisite characteristic of osseointegration. Without it, long-term success cannot be achieved. Continuous monitoring in a quantitative and objective manner is important to determine the status of implant stability. Measurement of implant stability is a valuable tool for making decisions pertaining to treatment protocol and also improves dentist-patient communication. Owing to the invasive nature of histological analysis, various others methods have been proposed like r...

  20. Comparison of Marginal Bone Changes with Internal Conus and External Hexagon Design Implant Systems: A Prospective, Randomized Study.

    Science.gov (United States)

    Cooper, Lyndon F; Tarnow, Dennis; Froum, Stuart; Moriarty, John; De Kok, Ingeborg J

    2016-01-01

    A central dental implant success criterion is the marginal bone response as measured longitudinally. Factors that influence marginal bone changes include osseous and soft tissue architecture, occlusal loading factors, implant position, implant design, and inflammatory processes. The evolution of implant design is multifactorial and includes the implant-abutment interface geometries. The primary objective of this study was to compare the proximal marginal bone changes following placement and loading of internal conus design implants (ICI) and external hex design implants (EXI) used in the treatment of posterior partial edentulism. Among 45 enrolled participants, 39 were treated with 47 ICI or 46 EXI implants using a one-stage implant protocol. Prosthetic restoration was completed after 12 weeks using stock titanium abutments and all-ceramic crowns. Follow-up visits including clinical and radiographic examinations were performed 6 months after permanent restoration and then annually for 3 years. Marginal bone level changes, papilla index scores, condition of the peri-implant mucosa, presence of complications, and participant satisfaction were evaluated. The mean marginal bone level change from implant placement to 3 years was -0.25 ± 0.60 mm and -0.5 ± 0.93 mm for ICI and EXI implants, respectively. The change recorded from permanent restoration to 3 years was a gain of 0.31 ± 0.41 mm versus 0.04 ± 0.51 mm for ICI and EXI implants, respectively (P 90%) of participants stated they were satisfied or very satisfied with their implant prosthesis and rated function and esthetics highly for both implant types after 3 years in function. Modestly greater marginal bone loss occurred at EXI implants. Further, more positive papilla scores were found between adjacent ICI implants than between adjacent EXI implants. EXI implants displayed more abutment complications than the ICI implants. The implant-abutment interface design may contribute to therapeutic outcome differences

  1. Individual Differences in Effectiveness of Cochlear Implants in Children Who Are Prelingually Deaf: New Process Measures of Performance

    OpenAIRE

    Pisoni, David B.; Cleary, Miranda; Geers, Ann E.; Tobey, Emily A.

    1999-01-01

    The efficacy of cochlear implants in children who are deaf has been firmly established in the literature. However, the effectiveness of cochlear implants varies widely and is influenced by demographic and experiential factors. Several key findings suggest new directions for research on central auditory factors that underlie the effectiveness of cochlear implants. First, enormous individual differences have been observed in both adults and children on a wide range of audiological outcome measu...

  2. 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...

  3. 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...

  4. 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...

  5. 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...

  6. 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...

  7. Paediatric cataract implant surgery outcome

    OpenAIRE

    Istiantoro Istiantoro

    2003-01-01

    This study evaluated the surgical outcome of various surgical technique in paediatric cataract implant surgery, at Jakarta Eye Center, Jakarta, Indonesia. This was a retrospective study of 57 eyes in 44 children who had primary cataract implants surgery. Three surgical techniques used were : 1. Extracapsular cataract extraction with intraocular lens implantation with intact posterior capsule which was performed on 21 eyes (group 1). 2. Extracapsular cataract extraction with intraocular lens i...

  8. 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.

  9. 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...

  10. Ion implantation: Science and technology

    International Nuclear Information System (INIS)

    This book is a tutorial presentation of the science, techniques, and machines of ion implantation. The first section of this book concerns the science of ion implantation. It covers the historical development of the field, and the basic theory of energetic ion penetration of solids. The major concentration of this section is to explain the nature of the creation of damage in crystaline silicon during ion implantation, and the methods which can be used to recover the original crystalinity. Especially helpful are the TEM photographs scattered throughout this section which show the many phases of the morphology of ion implantation damage. Methods are described which allow the quantitative evaluation of the success of the implantation and the recovery of the semiconductor. The last half of this book describes the ion accelerators (implanters) used in ion implantation, with a detailed presentation of the major components which require maintenance. A large part of this section concerns the methods of quantitatively evaluating the performance of ion implanters. A chapter is devoted to the extensive safety hazards of implanters and methods to maintain safe operation

  11. 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...

  12. 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

  13. Pyoderma gangrenosum after totally implanted central venous access device insertion

    OpenAIRE

    Hagen Monica E; Braun Rolf; Myers Patrick O; Inan Ihsan; Morel Philippe

    2008-01-01

    Abstract Background Pyoderma gangrenosum is an aseptic skin disease. The ulcerative form of pyoderma gangrenosum is characterized by a rapidly progressing painful irregular and undermined bordered necrotic ulcer. The aetiology of pyoderma gangrenosum remains unclear. In about 70% of cases, it is associated with a systemic disorder, most often inflammatory bowel disease, haematological disease or arthritis. In 25–50% of cases, a triggering factor such as recent surgery or trauma is identified....

  14. Imaging breasts with silicone implants

    International Nuclear Information System (INIS)

    Over the last two decades, the use of breast implants both for breast augmentation and for breast reconstruction following mastectomy has increased substantially. It is estimated that around two million women have undergone breast augmentation, while hundreds of thousands have had breast reconstruction surgery. Different types of material have been used for breast implants, but silicone gel implants have been the dominating implant type. Many implants can lead to complications, such as hardening and rupture, and may therefore need in vivo evaluation by imaging, particularly if they lead to clinical symptoms. They can also pose problems in the assessment of surrounding breast tissue by conventional mammography. In this respect, imaging modalities such as ultrasound, computed tomography and magnetic resonance imaging offer greater possibilities to assess a failing implant, as well as surrounding breast tissue. Several factors, mainly of a psychological nature, lead to requests for breast implants. In this review article, only the imaging aspects of breasts with silicone gel implants will be dealt with. Each modality is concisely presented with its possibilities and limitations. (orig.)

  15. 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...

  16. 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.

  17. 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.

  18. Anatomic consideration for preventive implantation.

    Science.gov (United States)

    Denissen, H W; Kalk, W; Veldhuis, H A; van Waas, M A

    1993-01-01

    The aim of preventive implant therapy is to prevent or delay loss of alveolar ridge bone mass. For use in an anatomic study of 60 mandibles, resorption of the alveolar ridge was classified into four preventive stages: (1) after extraction of teeth; (2) after initial resorption; (3) when the ridge has atrophied to a knife-edge shape; and (4) when only basal bone remains. Implantation in stage 3 necessitates removal of the knife-edge ridge to create space for cylindrical implants. Therefore, implantation in stage 2 is advocated to prevent the development of stage 3. The aim of implantation in stage 4 is to prevent total loss of function of the atrophic mandible. PMID:8359876

  19. Anesthesia management for MitraClip device implantation

    Directory of Open Access Journals (Sweden)

    Harikrishnan Kothandan

    2014-01-01

    Full Text Available Aims and Objectives: Percutaneous MitraClip implantation has been demonstrated as an alternative procedure in high-risk patients with symptomatic severe mitral regurgitation (MR who are not suitable (or denied mitral valve repair/replacement due to excessive co morbidity. The MitraClip implantation was performed under general anesthesia and with 3-dimensional transesophageal echocardiography (TEE and fluoroscopic guidance. Materials and Methods: Peri-operative patient data were extracted from the electronic and paper medical records of 21 patients who underwent MitraClip implantations. Results: Four MitraClip implantation were performed in the catheterization laboratory; remaining 17 were performed in the hybrid operating theatre. In 2 patients, procedure was aborted, in one due to migration of the Chiari network into the left atrium and in second one, the leaflets and chords of the mitral valve torn during clipping resulting in consideration for open surgery. In the remaining 19 patients, MitraClip was implanted and the patients showed acute reduction of severe MR to mild-moderate MR. All the patients had invasive blood pressure monitoring and the initial six patients had central venous catheterization prior to the procedure. Intravenous heparin was administered after the guiding catheter was introduced through the inter-atrial septum and activated clotting time was maintained beyond 250 s throughout the procedure. Protamine was administered at the end of the procedure. All the patients were monitored in the intensive care unit after the procedure. Conclusions: Percutaneous MitraClip implantation is a feasible alternative in high-risk patients with symptomatic severe MR. Anesthesia management requirements are similar to open surgical mitral valve repair or replacement. TEE plays a vital role during the MitraClip implantation.

  20. Efficacy of Ozurdex implant in treatment of noninfectious intermediate uveitis

    Directory of Open Access Journals (Sweden)

    Swetha Palla

    2015-01-01

    Full Text Available Aims: To report our experiences using Ozurdex, a biodegradable implant, containing 0.7 mg of dexamethasone in the treatment of noninfectious intermediate uveitis. Settings and Design: Retrospective study design. Methods: We conducted a retrospective study of medical records of patients with noninfectious intermediate uveitis having either cystoid macular edema (CME or vitritis who were not responsive to standard treatment and subsequently received Ozurdex implant from March 2011 to April 2013. The outcomes measured were best-corrected visual acuity, central retinal thickness (CRT, and vitreous haze score. Statistical Analysis Used: Paired t-test was used to test the significance of difference between quantitative variables. A P < 0.05 is taken to denote significant relationship. Results: Twenty eyes of 15 patients with mean age of 39.8 years who received Ozurdex implant were included in the study. The mean baseline visual acuity improved from 0. 666 logarithm of the minimum angle of resolution (logMAR units to 0.479 logMAR units at 6 weeks after the implant. The mean CRT improved from 536.1 to 361.4 microns at 6 weeks postimplant both parameters were statistically significant. The ocular inflammation was controlled in almost all the patients. Cataract and raised intraocular pressure were documented complications. Conclusion: Ozurdex implant is a promising treatment option and efficient in controlling the inflammation and CME in cases of noninfectious intermediate uveitis not responding to standard treatment.

  1. Mechanical assessment of grit blasting surface treatments of dental implants.

    Science.gov (United States)

    Shemtov-Yona, K; Rittel, D; Dorogoy, A

    2014-11-01

    This paper investigates the influence of surface preparation treatments of dental implants on their potential (mechanical) fatigue failure, with emphasis on grit-blasting. The investigation includes limited fatigue testing of implants, showing the relationship between fatigue life and surface damage condition. Those observations are corroborated by a detailed failure analysis of retrieved fracture dental implants. In both cases, the negative effect of embedded alumina particles related to the grit-blasting process is identified. The study also comprises a numerical simulation part of the grit blasting process that reveals, for a given implant material and particle size, the existence of a velocity threshold, below which the rough surface is obtained without damage, and beyond which the creation of significant surface damage will severely reduce the fatigue life, thus increasing fracture probability. The main outcome of this work is that the overall performance of dental implants comprises, in addition to the biological considerations, mechanical reliability aspects. Fatigue fracture is a central issue, and this study shows that uncontrolled surface roughening grit-blasting treatments can induce significant surface damage which accelerate fatigue fracture under certain conditions, even if those treatments are beneficial to the osseointegration process. PMID:25173238

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

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; Hoogwegt, Madelein T; Jordaens, Luc; Theuns, Dominic A M J

    2013-01-01

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

  3. Long term angiographic and clinical follow up in patients with stent implantation for symptomatic myocardial bridging

    OpenAIRE

    Haager, P; Schwarz, E.; Dahl, J.; Klues, H; Reffelmann, T; Hanrath, P

    2000-01-01

    OBJECTIVE—To assess long term results of coronary stent implantation in patients with symptomatic myocardial bridging.
METHODS—Intracoronary stent implantation was performed within the intramural course of the left anterior descending coronary artery in 11 patients with objective signs of myocardial ischaemia and absence of other cardiac disorders. All had myocardial bridging of the central portion of the left anterior descending coronary artery. Quantitative coronary angiography was performe...

  4. Further In-vitro Characterization of an Implantable Biosensor for Ethanol Monitoring in the Brain

    OpenAIRE

    Gaia Rocchitta; Pier Andrea Serra; Robert D. O'Neill; Maria Speranza Desole; Rossana Migheli; Marco Pirisinu; Gianfranco Bazzu; Ylenia Spissu; Manuel Zinellu; Ottavio Secchi

    2013-01-01

    Ethyl alcohol may be considered one of the most widespread central nervous system (CNS) depressants in Western countries. Because of its toxicological and neurobiological implications, the detection of ethanol in brain extracellular fluid (ECF) is of great importance. In a previous study, we described the development and characterization of an implantable biosensor successfully used for the real-time detection of ethanol in the brain of freely-moving rats. The implanted biosensor, integrated ...

  5. Stress Analysis on Single Cobalt/Chrome Prosthesis With a 15-mm Cantilever Placed Over 10/13/15-mm-length Implants: A Simulated Photoelastic Model Study.

    Science.gov (United States)

    Gastaldo, José Fábio Guastelli; Pimentel, Angélica Castro; Gomes, Maria Helena; Sendyk, Wilson Roberto; Laganá, Dalva Cruz

    2015-12-01

    The aim of study was to assess the stress around 10/13/15-mm implants in the mandibular area with a 15-mm cantilevered acrylic-resin-coated prostheses following the application force, using the photoelasticity method. Three photoelastic mandibular models were created containing 10-, 13-, and 15-mm implants in length and 3.75 mm in diameter. The implants had bore internal hex connections and were placed parallel to the intermental region. Abutments with 1-mm high cuffs were placed over the implants, and a single cobalt/chrome metallic prosthesis with a 15-mm cantilever, coated with thermoplastic acrylic resin, was placed on top. Loads of 1.0 and 3.0 bars were applied, and the images were photographed and assessed by photoelasticity method. The greatest stress levels were observed for the 10-mm implants. The stress pattern was the same regardless of implant length; only the magnitude of the stress along the implant body revealed changes. Increased implant length played a role in reducing stress on the investigated area of the model, and the 15-mm implants exhibited the best performance in regard to stress distribution. The highest stress levels were found in the implants closest to the cantilever and the central implant. The longest implants were more favorable in regard to the stress distribution on the peri-implant support structures in the 15-mm cantilevered prosthesis under loads. PMID:24914673

  6. Silicone breast implants: complications.

    Science.gov (United States)

    Iwuagwu, F C; Frame, J D

    1997-12-01

    Silicone breast implants have been used for augmentation mammoplasty for cosmetic purposes as well as for breast reconstruction following mastectomy for more than three decades. Though the use of the silicone gel filled variety has been banned in the USA except for special cases, they continue to be available elsewhere in the world including the UK. Despite the immense benefit they provide, their usage is associated with some complications. Most of these are related to the surgery and can be reduced by good surgical management. The major complications associated with their use is adverse capsular contracture, an outcome which can be very frustrating to manage. This article reviews the commonly reported complications and suggested management alternatives. PMID:9613406

  7. Hydrogen implantation into silicon

    International Nuclear Information System (INIS)

    Hydrogen and deuterium implantations into crystalline silicon (c-Si) are carried out at room temperature. Infra-red spectra and electrical property studies are performed on these samples before and following annealing. Analysis of the vibrational spectra shows at least two types of bonding for hydrogen in c-Si, which are identified as SiH1, (SiH2)2 units. A strong evidence of SiH2 group formation is obtained for the relatively low hydrogen concentration in c-Si in comparison with a-Si:H. On the basis of the kinetics of formation and annealing of Si-H vibrations and scanning micrograph data it is concluded that the microvoids with reconstructed inner surfaces, and hydrogen passivating dangling bonds, are effectively produced due to divacancy type defect agglomeration followed by hydrogen trapping. The electrical properties of c-Si:H are discussed also. (author)

  8. 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.

  9. 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)

  10. Basic research on maxillofacial implants

    International Nuclear Information System (INIS)

    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)

  11. COCHLEAR IMPLANTATION PREVALENCE IN ELDERLY

    Directory of Open Access Journals (Sweden)

    A. V. Starokha

    2014-01-01

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

  12. 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

  13. 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

  14. Cluster Implantation and Deposition Apparatus

    DEFF Research Database (Denmark)

    Hanif, Muhammad; Popok, Vladimir

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

  15. Iodine-125 orbital brachytherapy with a prosthetic implant in situ

    Energy Technology Data Exchange (ETDEWEB)

    Stannard, Clare [Groote Schuur Hospital and Cape Town Univ. (South Africa). Dept. of Radiation Oncology; Maree, Gert; Munro, Roger [Groote Schuur Hospital and Cape Town Univ. (South Africa). Dept. of Medical Physics; Lecuona, Karin [Groote Schuur Hospital and Cape Town Univ. (South Africa). Dept. of Ophthalmology; Sauerwein, Wolfgang [Universitaetsklinikum Essen (Germany). Strahlenklinik, NCTeam

    2011-05-15

    Purpose: Brachytherapy is one method of irradiating the orbit after enucleation of an eye with a malignant tumor that has a potential to recur. It consists of 6 trains of I-125 seeds placed around the periphery of the orbit, a shorter central train, and a metal disc, loaded with seeds, placed beneath the eyelids. The presence of a prosthetic orbital implant requires omission of the central train and adjustment of the activity of the seeds in the anterior orbit around the prosthesis. Patients and Methods: This is a retrospective review of the technical modifications and outcome of 12 patients treated in this manner: 6 with retinoblastoma, 5 with malignant melanoma, and 1 with an intraocular rhabdomyosarcoma. The median dose was 35.5 Gy in 73 hours for retinoblastoma and 56 Gy in 141 hours for malignant melanoma. Patients with retinoblastoma and rhabdomyosarcoma also received chemotherapy. Results: The tubes can be placed satisfactorily around the prosthesis. The increased activity in the anterior half of the tubes produced comparable dose distributions. There have been no orbital recurrences, no extrusion of the prosthesis, and cosmesis is good. Conclusion: Insertion of a prosthetic implant at the time of enucleation greatly enhances the subsequent cosmetic appearance. This should be encouraged unless there is frank tumor in the orbit. Orbital brachytherapy without the central train continues to give excellent local control. The short treatment time and good cosmesis are added advantages. The patient is spared the expense and inconvenience of removing and replacing the prosthetic implant. (orig.)

  16. Iodine-125 orbital brachytherapy with a prosthetic implant in situ

    International Nuclear Information System (INIS)

    Purpose: Brachytherapy is one method of irradiating the orbit after enucleation of an eye with a malignant tumor that has a potential to recur. It consists of 6 trains of I-125 seeds placed around the periphery of the orbit, a shorter central train, and a metal disc, loaded with seeds, placed beneath the eyelids. The presence of a prosthetic orbital implant requires omission of the central train and adjustment of the activity of the seeds in the anterior orbit around the prosthesis. Patients and Methods: This is a retrospective review of the technical modifications and outcome of 12 patients treated in this manner: 6 with retinoblastoma, 5 with malignant melanoma, and 1 with an intraocular rhabdomyosarcoma. The median dose was 35.5 Gy in 73 hours for retinoblastoma and 56 Gy in 141 hours for malignant melanoma. Patients with retinoblastoma and rhabdomyosarcoma also received chemotherapy. Results: The tubes can be placed satisfactorily around the prosthesis. The increased activity in the anterior half of the tubes produced comparable dose distributions. There have been no orbital recurrences, no extrusion of the prosthesis, and cosmesis is good. Conclusion: Insertion of a prosthetic implant at the time of enucleation greatly enhances the subsequent cosmetic appearance. This should be encouraged unless there is frank tumor in the orbit. Orbital brachytherapy without the central train continues to give excellent local control. The short treatment time and good cosmesis are added advantages. The patient is spared the expense and inconvenience of removing and replacing the prosthetic implant. (orig.)

  17. 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.

  18. 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...

  19. 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...

  20. Deprivation-induced cortical reorganization in children with cochlear implants.

    Science.gov (United States)

    Sharma, Anu; Gilley, Phillip M; Dorman, Michael F; Baldwin, Robert

    2007-09-01

    A basic finding in developmental neurophysiology is that some areas of the cortex cortical areas will reorganize following a period of stimulus deprivation. In this review, we discuss mainly electroencephalography (EEG) studies of normal and deprivation-induced abnormal development of the central auditory pathways in children and in animal models. We describe age cut-off for sensitive periods for central auditory development in congenitally deaf children who are fitted with a cochlear implant. We speculate on mechanisms of decoupling and reorganization which may underlie the end of the sensitive period. Finally, we describe new magentoencephalography (MEG) evidence of somatosensory cross-modal plasticity following long-term auditory deprivation. PMID:17828665

  1. Simultaneous implant placement with ridge augmentation using an autogenous bone ring transplant.

    Science.gov (United States)

    Omara, M; Abdelwahed, N; Ahmed, M; Hindy, M

    2016-04-01

    The severely defective socket, in which implant placement within the remaining bone will result in a significantly off-axis implant position, precludes immediate implant placement and requires bone grafting as an initial surgical intervention. The aims of this study were to evaluate autogenous chin bone ring consolidation after the augmentation of severely defective sockets and the clinical application of these rings in the premolar-molar region with simultaneous implant placement in a one-stage procedure. Ten patients with 12 defective sockets were included. Sockets were prepared with a trephine bur. Bone rings with a tapped implant osteotomy were harvested from the chin with a larger trephine bur. Bone rings were fitted in the prepared sockets. An implant drill was used to prepare the bone apical to the ring through its central osteotomy. Implants were screwed through the rings and the apical bone. Patients were examined clinically and radiographically immediately and at 6 months postoperative. Crestal bone changes were measured and evaluated statistically. All grafted sockets showed bone healing with no significant crestal bone resorption and no infection; only one ring showed dehiscence, which healed during the follow-up period. All implants showed radiographic evidence of osseointegration. The autogenous chin bone ring augmentation technique was found to be a reliable alternative method for the management of severely defective sockets. PMID:26644216

  2. High dose metal ion implantation

    International Nuclear Information System (INIS)

    To affect non-electronic surface properties (wear, corrosion and so on) the implanted material must reach measureable atom percentages, on the order of 10%, requiring ion implantation does in the range of 1017/cm2. For this reason, the MEVVA metallic ion source, developed at Lawrence Berkeley Laboratory, has been modified to provide metal ions for high dose metal ion implantation. The modifications inlcude increasing the arc efficiency, increasing beam spot size, and increasing beam divergence. The extracted beams have been characterized as to beam cross section and the depth profiles of implants. Time-average beam currents in excess of 20 mA have been extracted. Beams of titanium, tantalum, and other refractory metal ions, plus other refractory materials, such as titanium carbide, have been extracted and used to produce modifications in the surface properties of materials. (orig.)

  3. Photobiomodulation and implants: implications for dentistry

    OpenAIRE

    Tang, Elieza; Arany, Praveen

    2013-01-01

    The use of dental implants has become a mainstay of rehabilitative and restorative dentistry. With an impressive clinical success rate, there remain a few minor clinical issues with the use of implants such as peri-implant mucositis and peri-implantitis. The use of laser technology with implants has a fascinating breadth of applications, beginning from their precision manufacturing to clinical uses for surgical site preparation, reducing pain and inflammation, and promoting osseointegration a...

  4. 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...

  5. 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...

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

    Directory of Open Access Journals (Sweden)

    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

  7. Advances in lens implant technology

    OpenAIRE

    Kook, Daniel; Kampik, Anselm; Dexl, Alois K.; Zimmermann, Nicole; Glasser, Adrian; Baumeister, Martin; Kohnen, Thomas

    2013-01-01

    Cataract surgery is one of the oldest and the most frequent outpatient clinic operations in medicine performed worldwide. The clouded human crystalline lens is replaced by an artificial intraocular lens implanted into the capsular bag. During the last six decades, cataract surgery has undergone rapid development from a traumatic, manual surgical procedure with implantation of a simple lens to a minimally invasive intervention increasingly assisted by high technology and a broad variety of imp...

  8. 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...

  9. Model Checking Implantable Cardioverter Defibrillators

    OpenAIRE

    Abbas, Houssam; Jang, Kuk Jin; Jiang, Zhihao; Mangharam, Rahul

    2015-01-01

    Ventricular Fibrillation is a disorganized electrical excitation of the heart that results in inadequate blood flow to the body. It usually ends in death within seconds. The most common way to treat the symptoms of fibrillation is to implant a medical device, known as an Implantable Cardioverter Defibrillator (ICD), in the patient's body. Model-based verification can supply rigorous proofs of safety and efficacy. In this paper, we build a hybrid system model of the human heart+ICD closed loop...

  10. 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...

  11. New paradigm in implant osseointegration

    OpenAIRE

    Meyer Ulrich; Joos Ulrich

    2006-01-01

    Abstract During the last years, implant dentistry has seen an dramatic increase as a treatment option in oral rehabilitation. This is based to a large extent on scientific advances and clinical improvements in implantology. The extension of indications has broadened the opprtunities to rehabilitate patients that were formerly considered to posess restricted indications to place implants. Additionally, patient desires (high aesthetic demands, fast prosthetic rehabilitation) were placed more in...

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

    Directory of Open Access Journals (Sweden)

    Sabrina Letícia Couto da Silva

    2011-07-01

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

  13. Europa central

    Directory of Open Access Journals (Sweden)

    Karel BARTOSEK

    2010-02-01

    Full Text Available La investigación francesa continúa interesándose por Europa Central. Desde luego, hay límites a este interés en el ambiente general de mi nueva patria: en la ignorancia, producto del largo desinterés de Francia por este espacio después de la Segunda Guerra Mundial, y en el comportamiento y la reflexión de la clase política y de los medios de comunicación (una anécdota para ilustrar este ambiente: durante la preparación de nuestro coloquio «Refugiados e inmigrantes de Europa Central en el movimiento antifascista y la Resistencia en Francia, 1933-1945», celebrado en París en octubre de 1986, el problema de la definición fue planteado concreta y «prácticamente». ¡Y hubo entonces un historiador eminente, para quién Alemania no formaría parte de Europa Central!.

  14. 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.

  15. Automated treatment planning engine for prostate seed implant brachytherapy

    International Nuclear Information System (INIS)

    Purpose: To develop a computer-intelligent planning engine for automated treatment planning and optimization of ultrasound- and template-guided prostate seed implants. Methods and Materials: The genetic algorithm was modified to reflect the 2D nature of the implantation template. A multi-objective decision scheme was used to rank competing solutions, taking into account dose uniformity and conformity to the planning target volume (PTV), dose-sparing of the urethra and the rectum, and the sensitivity of the resulting dosimetry to seed misplacement. Optimized treatment plans were evaluated using selected dosimetric quantifiers, dose-volume histogram (DVH), and sensitivity analysis based on simulated seed placement errors. These dosimetric planning components were integrated into the Prostate Implant Planning Engine for Radiotherapy (PIPER). Results: PIPER has been used to produce a variety of plans for prostate seed implants. In general, maximization of the minimum peripheral dose (mPD) for given implanted total source strength tended to produce peripherally weighted seed patterns. Minimization of the urethral dose further reduced the loading in the central region of the PTV. Isodose conformity to the PTV was achieved when the set of objectives did not reflect seed positioning uncertainties; the corresponding optimal plan generally required fewer seeds and higher source strength per seed compared to the manual planning experience. When seed placement uncertainties were introduced into the set of treatment planning objectives, the optimal plan tended to reach a compromise between the preplanned outcome and the likelihood of retaining the preferred outcome after implantation. The reduction in the volatility of such seed configurations optimized under uncertainty was verified by sensitivity studies. Conclusion: An automated treatment planning engine incorporating real-time sensitivity analysis was found to be a useful tool in dosimetric planning for prostate

  16. 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.

  17. 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...... the period between 1999 and 2006. A history of radiation therapy was associated with increased risk of severe capsular contracture for 1- and 2-stage procedures, with adjusted hazard ratios (HR) of 3.3 (95% confidence interval [CI]: 0.9-12.4) and 7.2 (95% CI: 2.4-21.4), respectively. Similarly, a...... history 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...

  18. 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...

  19. 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.

  20. 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

  1. 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.

  2. 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

  3. The role of biomaterial properties in peri-implant neovascularization

    Science.gov (United States)

    Raines, Andrew Lawrence

    An understanding of the interactions between orthopaedic and dental implant surfaces with the surrounding host tissue is critical in the design of next generation implants to improve osseointegration and clinical success rates. Critical to the process of osseointegration is the rapid establishment of a patent neovasculature in the peri-implant space to allow for the delivery of oxygen, nutrients, and progenitor cells. The central aim of this thesis is to understand how biomaterials regulate cellular and host tissue response to elicit a pro-angiogenic microenvironment at the implant/tissue interface. To address this question, the studies performed in this thesis aim to (1) determine whether biomaterial surface properties can modulate the production and secretion of pro-angiogenic growth factors by cells, (2) determine the role of integrin and VEGF-A signaling in the angiogenic response of cells to implant surface features, and (3) to determine whether neovascularization in response to an implanted biomaterial can be modulated in vivo. The results demonstrate that biomaterial surface microtopography and surface energy can increase the production of pro-angiogenic growth factors by osteoblasts and that these growth factors stimulate the differentiation of endothelial cells in a paracrine manner and the results suggest that signaling through specific integrin receptors affects the production of angiogenic growth factors by osteoblast-like cells. Further, using a novel in vivo model, the results demonstrate that a combination of a rough surface microtopography and high surface energy can improve bone-to-implant contact and neovascularization. The results of these studies also suggest that VEGF-A produced by osteoblast-like cells has both an autocrine and paracrine effect. VEGF-A silenced cells exhibited reduced production of both pro-angiogenic and osteogenic growth factors in response to surface microtopgraphy and surface energy, and conditioned media from VEGF

  4. Current trends in ion implantation

    International Nuclear Information System (INIS)

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

  5. Paediatric cataract implant surgery outcome

    Directory of Open Access Journals (Sweden)

    Istiantoro Istiantoro

    2003-03-01

    Full Text Available This study evaluated the surgical outcome of various surgical technique in paediatric cataract implant surgery, at Jakarta Eye Center, Jakarta, Indonesia. This was a retrospective study of 57 eyes in 44 children who had primary cataract implants surgery. Three surgical techniques used were : 1. Extracapsular cataract extraction with intraocular lens implantation with intact posterior capsule which was performed on 21 eyes (group 1. 2. Extracapsular cataract extraction with intraocular lens implantation and posterior capsulorhexis (PCCC and optic capture which was performed on 24 eyes (group 2. 3. Extracapsular cataract extraction with intra­ocular lens implantation, posterior capsulorhexis and anterior vitrectomy which was performed on 24 eyes (group 3. All patients were followed up more than one year. Our results showed that posterior capsule opacity (PCO was developed in 20 eyes with intact capsules in group 1. All eyes had a clear visual axis in group 2. PCO developed only in one eye in group 3. In conclusion,  PCCC and optic capture with or without anterior vitrectomy are effective methods in preventing PCO in infant and children. (Med J Indones 2003; 12: 21-6Keywords: posterior capsule opacification, posterior capsulorhexis, optic capture, anterior vitrectomy

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

    Directory of Open Access Journals (Sweden)

    C. Concejo Cútoli

    2005-10-01

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

  7. Micromotion of Dental Implants: Basic Mechanical Considerations

    Directory of Open Access Journals (Sweden)

    Werner Winter

    2013-01-01

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

  8. Epidemiological study on the Trichinellosis of the fox (Vulpes vulpes in Tuscany (Central Italy

    Directory of Open Access Journals (Sweden)

    Marta Magi

    2008-07-01

    Full Text Available Abstract During the years 2004-2005, 112 foxes (Vulpes vulpes and 4 badgers (Meles meles were caught in different areas of Tuscany (Central Italy and examined for Trichinella infection, using the diagnostic technique of artificial digestion through Stomacher. No animal was positive for Trichinella larvae. According to our results, Tuscany can be considered a low-risk area for trichinellosis in the fox. In this region the presence of the parasite cannot be ruled out, two cases of infection being reported in 1993. Riassunto Epidemiologia della trichinellosi della volpe (Vulpes vulpes in Toscana (Italia centrale. Nel corso degli anni 2004-2005, 112 volpi (Vulpes vulpes e 4 tassi (Meles meles sono stati catturati ed esaminati per la presenza di infestione da Trichinella in differenti aree della Toscana (Italia centrale. L'indagine di laboratorio è stata condotta mediante digestione artificiale tramite Stomacher. Nessun animale è risultato positivo. Da questi risultati si può ritenere la Toscana una regione a basso rischio di infezione. La presenza del parassita non può però essere esclusa totalmente. Infatti, nel 1993 sono stati riportati due casi di infestione.

  9. Effect of ocular implants of different materials on the dosimetry of external beam radiation therapy

    International Nuclear Information System (INIS)

    Purpose: To study the attenuation and scattering effects of ocular implants, made from different materials, on the dose distributions of a 6 MV photon beam, and 6, 9, and 12 MeV electron beams used in orbital radiotherapy. Methods and Materials: Central axis depth-dose measurements were performed in a polystyrene phantom with embedded spherical ocular implants using film dosimetry of a 6 MV photon beam and electron beams of 6, 9, and 12 MeV energy. The isodose distributions were also calculated by a computerized treatment planning system using computerized tomography (CT) scans of a polystyrene phantom that had silicone, acrylic, and hydroxyapatite ocular implants placed into it. Results: Electron beam dose distributions display distortions both on the measured and calculated data. This effect is most accentuated for the hydroxyapatite implants, for which the transmissions through ocular implants are on the order of 93% for the 6 MV photon beam, and range from 60% for 6 MeV electrons to 90% for 12 MeV electrons. Conclusion: We studied the effect of ocular implants of various materials, embedded in a polystyrene phantom, on the dose distributions of a 6 MV photon beam, and 6, 9, and 12 MeV electron beams. Our investigations show that while 6 MV photons experience only a few percent attenuation, lower energy electron beam with 60% transmission is not a suitable choice of treating tumors behind the ocular implants

  10. 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

  11. Scleral buckling with hydrogel implant

    Directory of Open Access Journals (Sweden)

    Das Taraprasad

    1991-01-01

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

  12. Cortical Plasticity after Cochlear Implantation

    DEFF Research Database (Denmark)

    Petersen, Bjørn; Gjedde, Albert; Wallentin, Mikkel;

    2013-01-01

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

  13. 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. 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

  15. 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

  16. A transmission electron microscopy investigation of sulfide nanocrystals formed by ion implantation

    International Nuclear Information System (INIS)

    Ion implantation was used to form compound semiconductor nanocrystal precipitates of ZnS, CdS, and PbS in both glass and crystalline matrices. The precipitate microstructures and size distributions were investigated by cross-sectional transmission electron microscopy techniques. Several unusual features were observed, including strongly depth-dependent size variations of the ZnS precipitates and central void features in the CdS nanocrystals. The morphology and crystal structure of the nanocrystal precipitates could be controlled by selection of the host material. The size distribution and microstructural complexity were significantly reduced by implanting a low concentration of ions into a noncrystalline host, and by using multi-energy implants to give a flat concentration profile of the implanted elements. (c) 1999 Materials Research Society

  17. High breakdown-voltage diodes produced by multiple MeV B implants

    International Nuclear Information System (INIS)

    Diodes with high breakdown voltage were fabricated in an FZ grown Si n-type substrate of 103 Ωcm resistivity. Multiple energy boron implants of 15, 22 and 50 MeV, at a dose of 3 x 1011 cm-2, were performed on concentric circular areas of 7.5 and 3 mm in diameter. In addition a concentric area of 9 mm in diameter was implanted with 3 x 1011 cm-2, 80 keV boron ions, while the central region (1 mm in diameter) was heavily implanted (∼ 1015 cm-2) for ohmic contact formation. The breakdown voltage obtained, 5 x 103 V, was 25% lower than the 6700 V value calculated with experimental boron profiles. The difference is probably due to an incomplete field plate protection for the surface implant. (author)

  18. High breakdown-voltage diodes produced by multiple MeV B implants

    Energy Technology Data Exchange (ETDEWEB)

    Di Franco, A.; La Ferla, A.; Rimini, E. (Catania Univ. (Italy). Ist. di Fisica); Ciavola, G. (Laboratorio Nazionale del Sud, Catania (Italy)); Ferla, G. (SGS, Thomson Microelectronics, Catania (Italy))

    1990-07-01

    Diodes with high breakdown voltage were fabricated in an FZ grown Si n-type substrate of 10{sup 3} {Omega}cm resistivity. Multiple energy boron implants of 15, 22 and 50 MeV, at a dose of 3 x 10{sup 11} cm{sup -2}, were performed on concentric circular areas of 7.5 and 3 mm in diameter. In addition a concentric area of 9 mm in diameter was implanted with 3 x 10{sup 11} cm{sup -2}, 80 keV boron ions, while the central region (1 mm in diameter) was heavily implanted ({approx} 10{sup 15} cm{sup -2}) for ohmic contact formation. The breakdown voltage obtained, 5 x 10{sup 3} V, was 25% lower than the 6700 V value calculated with experimental boron profiles. The difference is probably due to an incomplete field plate protection for the surface implant. (author).

  19. 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

  20. Carbon Fiber Biocompatibility for Implants

    Science.gov (United States)

    Petersen, Richard

    2016-01-01

    Carbon fibers have multiple potential advantages in developing high-strength biomaterials with a density close to bone for better stress transfer and electrical properties that enhance tissue formation. As a breakthrough example in biomaterials, a 1.5 mm diameter bisphenol-epoxy/carbon-fiber-reinforced composite rod was compared for two weeks in a rat tibia model with a similar 1.5 mm diameter titanium-6-4 alloy screw manufactured to retain bone implants. Results showed that carbon-fiber-reinforced composite stimulated osseointegration inside the tibia bone marrow measured as percent bone area (PBA) to a great extent when compared to the titanium-6-4 alloy at statistically significant levels. PBA increased significantly with the carbon-fiber composite over the titanium-6-4 alloy for distances from the implant surfaces of 0.1 mm at 77.7% vs. 19.3% (p enhanced implant osseointegration. Carbon fibers acting as polymer coated electrically conducting micro-biocircuits appear to provide a biocompatible semi-antioxidant property to remove damaging electron free radicals from the surrounding implant surface. Further, carbon fibers by removing excess electrons produced from the cellular mitochondrial electron transport chain during periods of hypoxia perhaps stimulate bone cell recruitment by free-radical chemotactic influences. In addition, well-studied bioorganic cell actin carbon fiber growth would appear to interface in close contact with the carbon-fiber-reinforced composite implant. Resulting subsequent actin carbon fiber/implant carbon fiber contacts then could help in discharging the electron biological overloads through electrochemical gradients to lower negative charges and lower concentration. PMID:26966555

  1. 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.

  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. Preparation of targets by ion implantation

    International Nuclear Information System (INIS)

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

  4. 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, ...

  5. High fluence implantation in glasses: chemical interactions

    International Nuclear Information System (INIS)

    Results will be given on chemical interactions in amorphous SiO2 implanted with reactive and non-reactive species. Samples were implanted with nitrogen, silicon, titanium and silver; a set of samples already implanted with these elements (excluding those implanted with nitrogen) has been subjected to a second implant with nitrogen ions, at the dose of 2x1017 ions cm-2, at different energies. Samples have been characterized by secondary ion mass spectrometry, X-ray photoelectron spectroscopy, nuclear techniques and optical absorption measurements. Radiation damage and chemical effects have been discriminated; precipitation of the implanted species, as well as chemical compound formation in the interaction both between the implanted species and the host matrix and between the implanted species themselves have been detected. (orig.)

  6. 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 ...

  7. 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 ...

  8. 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.

  9. 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...

  10. Lattice site of helium implanted in magnesium aluminate spinel

    Energy Technology Data Exchange (ETDEWEB)

    Allen, W.R. (Metals and Ceramics Div., Oak Ridge National Lab., TN (United States))

    1993-01-01

    The lattice site of helium implanted at 60 keV in magnesium aluminate spinel (MgAl[sub 2]O[sub 4]) has been investigated with channeling effect measurements that apply the ion-induced [sup 3]He(d, p)[sup 4]He nuclear reaction. Within the spinel crystal structure, numerous interstices characterized by octahedral anion coordination are intrinsically unfilled by cations. For implantation at 300 K, a typical helium atom locates centrally in one of these vacant octahedral interstices with a probability of approximately 95%. Significant occupation of other lattice sites of either high or low symmetry was rejected. In particular helium neither clusters in defect complexes nor locates in tetrahedral interstices or substitutional sites. (orig.).

  11. Lattice site of helium implanted in magnesium aluminate spinel

    International Nuclear Information System (INIS)

    The lattice site of helium implanted at 60 keV in magnesium aluminate spinel (MgAl2O4) has been investigated with channeling effect measurements that apply the ion-induced 3He(d, p)4He nuclear reaction. Within the spinel crystal structure, numerous interstices characterized by octahedral anion coordination are intrinsically unfilled by cations. For implantation at 300 K, a typical helium atom locates centrally in one of these vacant octahedral interstices with a probability of approximately 95%. Significant occupation of other lattice sites of either high or low symmetry was rejected. In particular helium neither clusters in defect complexes nor locates in tetrahedral interstices or substitutional sites. (orig.)

  12. Lattice site of helium implanted in magnesium aluminate spinel

    Science.gov (United States)

    Alien, W. R.

    1993-01-01

    The lattice site of helium implanted at 60 keV in magnesium aluminate spinel (MgAl 2O 4) has been investigated with channeling effect measurements that apply the ion-induced 3He(d, p) 4He nuclear reaction. Within the spinel crystal structure, numerous interstices characterized by octahedral anion coordination are intrinsically unfilled by cations. For implantation at 300 K, a typical helium atom locates centrally in one of these vacant octahedral interstices with a probability of approximately 95%. Significant occupation of other lattice sites of either high or low symmetry was rejected. In particular, helium neither clusters in defect complexes nor locates in tetrahedral interstices or substitutional sites.

  13. 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

  14. 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

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

    DEFF Research Database (Denmark)

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

    2011-01-01

    median score of 9 (range 5-10). Poor motility was present in six of 17 patients. Micro-organisms were identified in three removed implants and signs of inflammation were present in 20 removed implants. Conclusions:  If a decision of implant removal has been made, it is safe to replace the implant at the...

  16. 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)

  17. 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...

  18. Augmentation Mammaplasty Using Implants: A Review

    OpenAIRE

    Susumu Takayanagi

    2012-01-01

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

  19. 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.

  20. 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. ...

  1. 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

  2. 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, ...

  3. Techniques for dental implant nanosurface modifications

    OpenAIRE

    Pachauri, Preeti; Bathala, Lakshmana Rao; Sangur, Rajashekar

    2014-01-01

    PURPOSE Dental implant has gained clinical success over last decade with the major drawback related to osseointegration as properties of metal (Titanium) are different from human bone. Currently implant procedures include endosseous type of dental implants with nanoscale surface characteristics. The objective of this review article is to summarize the role of nanotopography on titanium dental implant surfaces in order to improve osseointegration and various techniques that can generate nanosc...

  4. 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...

  5. Implanting helium into nanocrystalline hydrogen storage alloy

    International Nuclear Information System (INIS)

    The possibility of implanting helium into LaNixAly alloy by high energy ball milling is explored. By analyzing the sample after ball milling, it is shown that Helium can be implanted into the material. Helium lies in the interfacial free volume rather than the crystal lattice. The implanted helium has high thermal stability. Quantity of Helium implanted by this method is very little

  6. Impact of Maintenance Therapy for the Prevention of Peri-implant Diseases: A Systematic Review and Meta-analysis.

    Science.gov (United States)

    Monje, A; Aranda, L; Diaz, K T; Alarcón, M A; Bagramian, R A; Wang, H L; Catena, A

    2016-04-01

    At the present time, peri-implantitis has become a global burden that occurs with a frequency from 1% to 47% at implant level. Therefore, we aimed herein at assessing the impact of peri-implant maintenance therapy (PIMT) on the prevention of peri-implant diseases. Electronic and manual literature searches were conducted by 3 independent reviewers using several databases, including MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, and Cochrane Oral Health Group Trials Register, for articles up to June 2015 without language restriction. Articles were included if they were clinical trials aimed at demonstrating the incidence of peri-implant diseases under a strict regime or not of PIMT. Implant survival and failure rate were studied as secondary outcomes. A meta-analysis was conducted to evaluate the influence of PIMT and other reported variables upon peri-implant diseases. Thirteen and 10 clinical trials were included in the qualitative and quantitative analysis, respectively. Mucositis was affected by history of periodontitis and mean PIMT at implant and patient levels, respectively. Similarly, significant effects of history of periodontal disease were obtained for peri-implantitis for both implant and patient levels. Furthermore, mean PIMT interval was demonstrated to influence the incidence of peri-implantitis at implant but not patient level. PIMT interval showed significance at both levels. For implant survival, implants under PIMT have 0.958 the incident event than those with no PIMT. Within the limitations of the present systematic review, it can be concluded that implant therapy must not be limited to the placement and restoration of dental implants but to the implementation of PIMT to potentially prevent biologic complications and hence to heighten the long-term success rate. Although it must be tailored to a patient's risk profiling, our findings suggest reason to claim a minimum recall PIMT interval of 5 to 6 mo. Additionally, it must be

  7. Periinterventional prophylactic antibiotics in radiological port catheter implantation

    International Nuclear Information System (INIS)

    Purpose: To evaluate whether catheter-related infections after radiologically placed port catheters can be reduced by single-shot periinterventional antibiosis. Materials and Method: Between January and September 2002, 164 consecutive patients with indication for central venous port catheter implantation were included in the present study. During implantation the interventional radiologist was responsible for deciding whether to administer a prophylactic single-shot antibiosis. The prophylactic antibiosis entailed intravenous administration of ampicillin and sulbactam (3 g Unacid, Pfizer) or 100 mg ciprofloxacine (Ciprobay, Bayer) in the case of an allergy history to penicillins. Catheter-related infection was defined as a local or systemic infection necessitating port catheter extraction. Results: Indication for port catheter implantation was a malignant disease requiring chemotherapy in 158 cases. The port catheter (Chemosite [Tyco Healthcare] [n = 123], low-profile [Arrow International] [n = 35], other port system [n = 6]) was implanted via sonographically guided puncture of the right jugular vein in 139 patients, via the left jugular vein in 24 cases and via the right subclavian vein in one patient. 75 patients received periinterventional prophylactic antibiosis (Unacid [n = 63] Ciprobay [n 12]) and 89 patients did not receive antibiosis. The prophylactic antibiosis caused a minor allergic reaction in one patient that improved with antihistamic and corticoid medication. A total of 7 ports, 6 without prophylactic antibiosis versus one with periinterventional prophylaxis, were extracted due to infectious complications. Conclusion: Single-shot periinterventional prophylactic antibiosis can reduce early and late infectious complications after radiological-interventional placement of central venous port catheters. (orig.)

  8. 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

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

    Science.gov (United States)

    Su, Y C

    2016-04-01

    It is a digital age today. Exposed to all kinds of digital products in many fields. Certainly, implant dentistry is not exception. Digitalization could improve the outcomes and could decrease the complications of implant dentistry. This paper introduces the concepts, definitions, advantages, disadvantages, limitations and errors of digital implant dentistry. PMID:27117209

  10. Bone reactions adjacent to titanium implants subjected to static load of different duration. A study in the dog (III)

    DEFF Research Database (Denmark)

    Gotfredsen, K; Berglundh, T; Lindhe, J

    2001-01-01

    The aim of the present experiment was to study the effect of a long-standing lateral static load on the peri-implant bone. Three beagle dogs were used. The mandibular premolars were extracted and 12 weeks later 3 titanium implants (ITI(R) Dental Implant System) were installed in each quadrant....... Crowns were fitted to all implants 12 weeks after the installation procedure. The anterior and central crowns were fused and connected to the posterior crown by an expansion screw. In the right side of the mandible, the expansion screws were activated every 2 weeks during a 46-week period. During the...... last 10 weeks of this period, an expansion force similar to that of the right side was applied in the left. The animals were sacrificed and block biopsies of each implant site harvested and prepared for histological analysis. Sites subjected to 10 weeks or 46 weeks of lateral load had a similar (i...

  11. Influence of mechanical instruments on the biocompatibility of titanium dental implants surfaces: a systematic review

    NARCIS (Netherlands)

    A. Louropoulou; D.E. Slot; F. van der Weijden

    2015-01-01

    Objective The objective of this systematic review was to evaluate the effect of mechanical instruments on the biocompatibility of titanium dental implant surfaces. Materials and methods MEDLINE, Cochrane-CENTRAL and EMBASE databases were searched up to December 2013, to identify controlled studies o

  12. 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...

  13. The Clinical Implications of Poly Implant Prothèse Breast Implants: An Overview

    OpenAIRE

    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 "aug...

  14. 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...

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

    OpenAIRE

    Jepsen, Søren; Berglundh, Tord; Genco, Robert; Aass, Anne Merete; Demirel, Korkud; Derks, Jan; Figuero, Elena; Giovannoli, Jean Louis; Goldstein, Moshe; LAMBERT, France; Ortiz-Vigon, Alberto; POLYZOIS, IOANNIS; Salvi, Giovanni; Schwarz, Frank; Serino, Giovanni

    2015-01-01

    Abstract AIMS: Over the past decades, the placement of dental implants has become a routine procedure in the oral rehabilitation of fully and partially edentulous patients. However, the number of patients/implants affected by peri-implant diseases is increasing. As there are--in contrast to periodontitis--at present no established and predictable concepts for the treatment of peri-implantitis, primary prevention is of key importance. The management of peri-implant mucositis is considere...

  16. 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.)

  17. 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

  18. 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

  19. 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.

  20. Radioactive implants for medical applications

    International Nuclear Information System (INIS)

    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 (Emax=1710.48 keV) 32P is a suitable radionuclide which can be produced from the stable 31P by the capture of thermal neutrons (1 x 1014 /s/cm2) in a nuclear reactor. After a typical irradiation time (14 days) the ratio of 32P to 31P is 1.4 x 10-5 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, 32P 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 101132P ions. The sputter ion gun, which has been optimized for this application, creates an ion beam with high beam current (> 14 μA P-) and low emittance (2) can be manufactured with high efficiency. The unintentionally co-implanted portion of molecules and nuclides of the same mass (e.g. 31PH, 16O2 and 32S) could be reduced from approximately 500 to 50 by an improvement of the isotope selection at 32P 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 dosimetry of 1-2 MeV electrons, the challenge arises from the short range (few millimeters only) in the tissue and the resulting steep dose decay. Therefore a Monte Carlo Simulation has been developed, based on

  1. 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

  2. The evolution of breast implants.

    Science.gov (United States)

    Maxwell, G Patrick; Gabriel, Allen

    2009-01-01

    Female glandular hypomastia is a frequently encountered entity that occurs either developmentally or by postpartum involution. Historically, women have long sought breast enlargement to improve physical proportions, to foster a more feminine appearance, or to enhance self-image. This article explores the evolution of breast implants. PMID:19055956

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

    Science.gov (United States)

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

    2016-01-01

    Peri-implantitis is an inflammatory disease affecting soft and hard tissues surrounding dental implants. As the global number of individuals that undergo restorative therapy through dental implants increases, peri-implantitis is considered as a major and growing problem in dentistry. A randomly selected sample of 588 patients who all had received implant-supported therapy 9 y earlier was clinically and radiographically examined. Prevalence of peri-implantitis was assessed and risk indicators were identified by multilevel regression analysis. Forty-five percent of all patients presented with peri-implantitis (bleeding on probing/suppuration and bone loss >0.5 mm). Moderate/severe peri-implantitis (bleeding on probing/suppuration and bone loss >2 mm) was diagnosed in 14.5%. Patients with periodontitis and with ≥4 implants, as well as implants of certain brands and prosthetic therapy delivered by general practitioners, exhibited higher odds ratios for moderate/severe peri-implantitis. Similarly, higher odds ratios were identified for implants installed in the mandible and with crown restoration margins positioned ≤1.5 mm from the crestal bone at baseline. It is suggested that peri-implantitis is a common condition and that several patient- and implant-related factors influence the risk for moderate/severe peri-implantitis (ClinicalTrials.gov NCT01825772). PMID:26701919

  4. Further in-vitro characterization of an implantable biosensor for ethanol monitoring in the brain

    OpenAIRE

    Secchi, Ottavio; Zinellu, Manuel; Spissu, Ylenia; Pirisinu, Marco; Bazzu, Gianfranco; Migheli, Rossana; Desole, Maria Speranza; O'Neill, Robert D.; Serra, Pier Andrea; Rocchitta, Gaia Giovanna Maria

    2013-01-01

    Ethyl alcohol may be considered one of the most widespread central nervous system (CNS) depressants in Western countries. Because of its toxicological and neurobiological implications, the detection of ethanol in brain extracellular fluid (ECF) is of great importance. In a previous study, we described the development and characterization of an implantable biosensor successfully used for the real-time detection of ethanol in the brain of freely-moving rats. The implanted biosensor, integrated ...

  5. 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...... parents perceived regarding their children's cochlear implants. Two examples are included in this article to illustrate the parents' perspectives about cochlear implantation in their deafblind children. Benefits of cochlear implantation in this cohort of children included improved attention and emotional...

  6. 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.

  7. 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.

  8. Three-Dimensional Finite Element Analysis of Anterior Single Implant-Supported Prostheses with Different Bone Anchorages

    OpenAIRE

    Fellippo Ramos Verri; Joel Ferreira Santiago Júnior; Daniel Augusto de Faria Almeida; Ana Caroline Gonçales Verri; Victor Eduardo de Souza Batista; Cleidiel Aparecido Araujo Lemos; Pedro Yoshito Noritomi; Eduardo Piza Pellizzer

    2015-01-01

    The aim of this study was to evaluate the stress distribution of monocortical and bicortical implant placement of external hexagon connection in the anterior region of the maxilla by 3D finite element analysis (FEA). 3D models were simulated to represent a bone block of anterior region of the maxilla containing an implant (4.0 × 10.0 mm) and an implant-supported cemented metalloceramic crown of the central incisor. Different techniques were tested (monocortical, bicortical, and bicortical ass...

  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. [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

  11. Ion implantation and bio-compatibility

    International Nuclear Information System (INIS)

    Surface modification of polymers by ion implantation has been carried out to control surface properties such as conductivity, wettability, blood and tissue compatibility. Ion implantation into silicone rubber, polystyrene and segmented polyurethane was performed at 150 keV with doses ranging from 1 x 1015 to 3 x 1017 ions/cm2 to improve bio-compatibility. The platelet accumulation on ion implanted silicone rubber decreased and non-thrombogenicity of ion implanted specimens were improved. The ion implanted polystyrene and segmented polyurethane have been found to exhibit remarkably higher adhesion and spreading of endothelial cells compared to the non-implanted case. It is concluded that ion implantation into polymers is effective in controlling their bio-compatibility. (author)

  12. Channeling implants of boron in silicon

    Science.gov (United States)

    Raineri, V.; Galvagno, G.; Rimini, E.; La Ferla, A.; Capizzi, S.; Carnera, A.; Ferla, G.

    1991-04-01

    80 keV B + ions were implanted in Si with a high-current implanter. The wafers were irradiated at 0° and 7°. The feasibility of the 0° implants was checked testing the influence of several geometrical parameters, such as the twist angle and the flex angle, on the shape and uniformity of the ion depth distributions. The damage generated by a high-fluence B + implant was lower for the 0° implanted samples and the disorder evolution was analyzed after different annealing processes were performed in the 600-120°C temperature range. Agglomeration and dissolution of extended defects in the 0° implanted samples occurs at temperatures 100° C lower than those in the 7° implanted samples.

  13. 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

  14. 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.

  15. 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

  16. [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

  17. 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

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

    Directory of Open Access Journals (Sweden)

    Bernardo Born PASSONI

    2014-10-01

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

  20. Learning and Memory Processes Following Cochlear Implantation:The Missing Piece of the Puzzle

    Directory of Open Access Journals (Sweden)

    David B. Pisoni

    2016-04-01

    Full Text Available At the present time, there is no question that cochlear implants work and often work very well in quiet listening conditions for many profoundly deaf children and adults. The speech and language outcomes data published over the last two decades document quite extensively the clinically significant benefits of cochlear implants. Although there now is a large body of evidence supporting the efficacy of cochlear implants as a medical intervention for profound hearing loss in both children and adults, there still remain a number of challenging unresolved clinical and theoretical issues that deal with the effectiveness of cochlear implants in individual patients that have not yet been successfully resolved. In this paper, we review recent findings on learning and memory, two central topics in the field of cognition that have been seriously neglected in research on cochlear implants. Our research findings on sequence learning, memory and organization processes, and retrieval strategies used in verbal learning and memory of categorized word lists suggests that basic domain-general learning abilities may be the missing piece of the puzzle in terms of understanding the cognitive factors that underlie the enormous individual differences and variability routinely observed in speech and language outcomes following cochlear implantation.

  1. Pacemakers and implantable cardioverter defibrillators.

    Science.gov (United States)

    Allen, M

    2006-09-01

    An increasing number of patients are now treated cardiac pacemakers and implantable cardioverter defibrillators and the technology of these is constantly changing. It is vital to have a good understanding of how they function and what the real risks are. Understanding how the device should work when functioning normally, and the possible effects of electromagnetic interference, is paramount to their safe management in the peri-operative period. Knowing when a device should be disabled or reprogrammed requires careful consideration. Information from the patient's pacemaker clinic should be sought whenever possible and can be invaluable. In addition, the Medicines Healthcare products Regulatory Agency have published the first set of UK guidelines on the management of implantable devices in the presence of surgical diathermy and this will undoubtedly provide a firm foundation on which anaesthetists can base much of their practice. PMID:16922756

  2. Implants of aluminum into silicon

    Science.gov (United States)

    Galvagno, G.; Scandurra, A.; Raineri, V.; Rimini, E.; La Ferla, A.; Sciascia, V.; Frisina, F.; Raspagliesi, M.; Ferla, G.

    1993-04-01

    The electrical behaviour of ion implanted aluminum into silicon was investigated by varying the beam energy in the 80 keV-6 MeV range, the dose in the 1 × 10 13-1 × 10 14/cm 2 range and the annealing procedure. Aluminum atoms precipitate into exten defects at the end of range damage and where the concentration exceeds the solid solubility value (about 2 × 10 19/cm 3 at 1200°C Escape of Al atoms occurs very easily as soon as they reach the external surface during the thermal diffusion. Using high energy implants, 6 MeV, it was possible to follow in detail the broadening of the diffused profiles. The measured trends between the retained dose and the junction depth and between the outdiffused dose and the annealing time are quite well predicted by the solution of the diffusion equation with the surface acting as a perfect sink for the dopant.

  3. Probabilistic predictive modelling of carbon nanocomposites for medical implants design.

    Science.gov (United States)

    Chua, Matthew; Chui, Chee-Kong

    2015-04-01

    Modelling of the mechanical properties of carbon nanocomposites based on input variables like percentage weight of Carbon Nanotubes (CNT) inclusions is important for the design of medical implants and other structural scaffolds. Current constitutive models for the mechanical properties of nanocomposites may not predict well due to differences in conditions, fabrication techniques and inconsistencies in reagents properties used across industries and laboratories. Furthermore, the mechanical properties of the designed products are not deterministic, but exist as a probabilistic range. A predictive model based on a modified probabilistic surface response algorithm is proposed in this paper to address this issue. Tensile testing of three groups of different CNT weight fractions of carbon nanocomposite samples displays scattered stress-strain curves, with the instantaneous stresses assumed to vary according to a normal distribution at a specific strain. From the probabilistic density function of the experimental data, a two factors Central Composite Design (CCD) experimental matrix based on strain and CNT weight fraction input with their corresponding stress distribution was established. Monte Carlo simulation was carried out on this design matrix to generate a predictive probabilistic polynomial equation. The equation and method was subsequently validated with more tensile experiments and Finite Element (FE) studies. The method was subsequently demonstrated in the design of an artificial tracheal implant. Our algorithm provides an effective way to accurately model the mechanical properties in implants of various compositions based on experimental data of samples. PMID:25658876

  4. 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...

  5. Double-implanted subvolt JFETs

    International Nuclear Information System (INIS)

    The fabrication and performance characteristics of double-implanted subvolt pinchoff JFETs suitable for low-voltage micropower analog applications are described. The process requires the addition of only one mask to the standard bipolar process. Typical devices exhibit a breakdown voltage of 5.5 V, gate leakage in the low pA range, a pinchoff voltage of about 0.5 V and a cutoff frequency of 10.4 MHz. (author)

  6. Implant periapical lesion. Case report

    OpenAIRE

    Gregory Venetis, Fotis Iordanidis, Paraskevi Giovani, Lambros Zouloumis

    2011-01-01

    Ιmplant periapical lesion (IPL) is probably not a uniform entity in all cases presented in the literature. Asseptic bone necrosis may be a cause for some of the IPLs, whilst the presence of microorganisms is not always detectable with conventional methods. A case of IPL in a male patient who underwent an extraction of 12 tooth and an immediate implantation at this site is presented. Eight months postoperatively, an IPL was revealed on radiologic examination. After surgical exploration, the IP...

  7. 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.

  8. 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...

  9. 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...

  10. 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.

  11. Simvastatin Reduces Capsular Fibrosis around Silicone Implants.

    Science.gov (United States)

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

    2016-08-01

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

  12. 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.

  13. Rochas ultramáficas plutônicas do greenstone belt Rio das Velhas na porção central do Quadrilátero Ferrífero, Minas Gerais, Brasil Plutonic ultramafic rocks of the greenstone belt Rio das Velhas in the central portion of the Quadrilátero Ferrífero, State of Minas Gerais, Brazil

    OpenAIRE

    Gabriela Magalhães da Fonseca; Hanna Jordt Evangelista

    2013-01-01

    Em Amarantina, distrito de Ouro Preto, encontram-se rochas ultramáficas expostas em duas áreas com cerca de 500 m² cada. As rochas afloram no Complexo do Bação, que é o embasamento gnáissico do greenstone belt Rio das Velhas, na porção central do Quadrilátero Ferrífero (QF). O interesse no estudo petrogenético desses corpos deve-se à preservação parcial de minerais ígneos, ausentes na maior parte das rochas ultramáficas totalmente metamorfizadas do QF. Entre essas rochas, destacam-se os estea...

  14. Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implantation

    Directory of Open Access Journals (Sweden)

    Ilze Oosthuizen

    2012-12-01

    Full Text Available Objective: To determine speech-perception-in-noise (with speech and noise spatially distinct and coincident and bilateral spatial benefits of head-shadow effect, summation, squelch and spatial release of masking in adults with delayed sequential cochlear implants. Study design: A cross-sectional one group post-test-only exploratory design was employed. Eleven adults (mean age 47 years; range 21 – 69 years of the Pretoria Cochlear Implant Programme (PCIP in South Africa with a bilateral severe-to-profound sensorineural hearing loss were recruited. Prerecorded Everyday Speech Sentences of The Central Institute for the Deaf (CID were used to evaluate participants’ speech-in-noise perception at sentence level. An adaptive procedure was used to determine the signal-to-noise ratio (SNR, in dB at which the participant’s speech reception threshold (SRT was achieved. Specific calculations were used to estimate bilateral spatial benefit effects. Results: A minimal bilateral benefit for speech-in-noise perception was observed with noise directed to the first implant (CI 1 (1.69 dB and in the speech and noise spatial listening condition (0.78 dB, but was not statistically significant. The head-shadow effect at 180° was the most robust bilateral spatial benefit. An improvement in speech perception in spatially distinct speech and noise indicates the contribution of the second implant (CI 2 is greater than that of the first implant (CI 1 for bilateral spatial benefit. Conclusion: Bilateral benefit for delayed sequentially implanted adults is less than previously reported for simultaneous and sequentially implanted adults. Delayed sequential implantation benefit seems to relate to the availability of the ear with the most favourable SNR.

  15. Complex diagnosis in dental implantation and potentialities of predicting the results of treatment

    International Nuclear Information System (INIS)

    Experience gained by the implantation Department of Central Research Institute of Dentistry in many years showed that comprehensive clinical and laboratory examinations, including roentgenological examination, functional diagnosis and examination of the immunity system help detect all unfavorable local and general factors. In patients referred to the risk group implantation is possible after preoperative treatment. Designing of STOM-1 and STOM-2, as well as of UMR-1 software helped carry our the calculations using IBM PC and determine the optimal type of the graft, place of its introduction, and number of grafts, as well as calculate the optimal design of the prosthesis

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

    OpenAIRE

    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. 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

  18. 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

  19. 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

  20. 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.

  1. Mutagenic Mechanisms of Ion Implantation in Plants

    International Nuclear Information System (INIS)

    Ion beam implantation, as a new mutation technique, has been widely used in mutation breeding, and great achievements have been made for both the agriculture and fermentation industry. The mechanism underlying ion beam-induced mutagenesis has been a topic of research in recent years. In this paper, we focus on the initial physical process of ion implantation into organisms, noting that energy deposit, mass deposit and charge transfer of the implanted ions into target organisms are the main contributors to the biological effects. Recent studies of remote damage following ion beam implantation in plant samples are also included. It was observed that targeted ion implantation of the shoot apical meristem (SAM) of Arabidopsis embryos induces damage to the root apical meristem (RAM), indicating long distance systemic effects in intact organisms. Further studies showed that the generation of reactive oxygen species upon ion implantation could play important roles in the observed systemic effects. (author)

  2. Microstructure of metal Ion implanted ceramics

    International Nuclear Information System (INIS)

    Microstructure of alumina and silicon nitride after metal ion implantation has been studied. A metal vapour vacuum arc (MEVVA) ion source was employed to implant Ti ions into alumina with 7.6x1016 and 3.1x1017 ions/cm2 at 40 keV. Ti ions were also implanted into silicon nitride at a dose of 4x1017 ions/cm2 at 70 keV. The characterisation of ion implanted ceramics by Rutherford Backscattering Spectrometry (RBS) and cross-sectional transmission electron microscopy (XTEM) showed low dose Ti implantation into alumina resulted in a highly defective surface layer. At higher dose, TiO2 precipitates in an amorphous matrix were detected. In contrast, Ti implantation into silicon nitride produced a layered structure. The upper most layer consisted of extremely fine TiN particles in an amorphous matrix. Underneath this layer, an amorphous layer was formed. (authors)

  3. Central Pain Syndrome

    Science.gov (United States)

    ... Enhancing Diversity Find People About NINDS NINDS Central Pain Syndrome Information Page Table of Contents (click to ... being done? Clinical Trials Organizations What is Central Pain Syndrome? Central pain syndrome is a neurological condition ...

  4. 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...

  5. Ion implantation in semiconductors and other materials

    International Nuclear Information System (INIS)

    The evolution of ion implantation techniques in the field of semiconductors and its extension to various fields such as metallurgy, mechanics, superconductivity and opto-electronics are considered. As for semiconductors ion implantation is evoked as: a means of predeposition of impurities at low doping level (1011 to 1014cm-2); a means for obtaining profiles of controlled concentration; a means of reaching high doping levels with using 'strong current' implantation machines of the second generation. Some results obtained are presented

  6. Improving biocompatibility of implants with nanolayering

    OpenAIRE

    Homar, Miha; GAŠPERLIN, MIRJANA; Dolenc, Andrej; Kristl, Julijana

    2015-01-01

    Biocompatibility of different materials in the body is very complicated phenomenon. Although structural characteristics of implant are decisive for its specific purpose, biologic response mainly depends on surface characteristics of the implant and its interaction with biologic environment. Nanolayering of the implant to improve biocompatibility presents a recent innovation in this field of research. One method of nanolayering is layer-by-layer assembly which has many advantages over other na...

  7. 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...

  8. 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 ...

  9. 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

  10. Strain driven fast osseointegration of implants

    Directory of Open Access Journals (Sweden)

    Wiesmann Hans-Peter

    2005-09-01

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

  11. Strain driven fast osseointegration of implants

    OpenAIRE

    Wiesmann Hans-Peter; Büchter Andre; Joos Ulrich; Meyer Ulrich

    2005-01-01

    Abstract Background Although the bone's capability of dental implant osseointegration has clinically been utilised as early as in the Gallo-Roman population, the specific mechanisms for the emergence and maintenance of peri-implant bone under functional load have not been identified. Here we show that under immediate loading of specially designed dental implants with masticatory loads, osseointegration is rapidly achieved. Methods We examined the bone reaction around non- and immediately load...

  12. Effects of radiotherapy on central venous ports

    International Nuclear Information System (INIS)

    During radiotherapy of patients with implant able central venous ports we are often afraid of complications resulting from ports damage on the one hand and their interaction with surrounding tissues on the other hand. In experimental conditions venous ports were exposed to radiation. It was found that radiation reflected from a port is negligible and should not put patients at risk. Radiotherapy does not cause any changes within a port chamber, however it substantially affects elasticity of a polyurethane port catheter and to a minimal extent affects silicone catheter. (authors)

  13. Iatrogenic Damage to the Periodontium Caused by Implants and Implant Treatment Procedures

    OpenAIRE

    Sirajuddin, Syed; Kripal, Krishna; MN, Kumuda; Chungkham, Sachidananda; Rafiuddin, Syed; BM, Chandrashekar

    2015-01-01

    A dental implant (also known as an endosseous implant or fixture) is a surgical component that interfaces with the bone of the jaw or skull to support a dental prosthesis such as a crown, bridge, denture, facial prosthesis or to act as an orthodontic anchor.Well planned, comprehensive treatment plans lead to successful implant treatment and patient satisfaction, which are the eventual long-term objectives. Probability of implant success can be put at jeopardy by absolute and relative risk fac...

  14. 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 ...

  15. 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

  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. Decontamination of dental implant surface in peri-implantitis treatment: a literature review

    OpenAIRE

    Mellado Valero, Ana; Buitrago Vera, Pedro José; Solá Ruiz, María Fernanda; Ferrer García, Juan Carlos

    2013-01-01

    Etiological treatment of peri-implantitis aims to reduce the bacterial load within the peri-implant pocket and decontaminate the implant surface in order to promote osseointegration. The aim of this literature review was to evaluate the efficacy of different methods of implant surface decontamination. A search was conducted using the PubMed (Medline) database, which identified 36 articles including in vivo and in vitro studies, and reviews of different decontamination systems (chemical, mecha...

  18. [Detection and therapy of respiratory dysfunction by implantable (cardiac) devices].

    Science.gov (United States)

    Fox, H; Oldenburg, O; Nölker, G; Horstkotte, D; Gutleben, K-J

    2014-02-01

    Sleep-disordered breathing (SDB) represents a common comorbidity in cardiac patients. The prevalence of obstructive sleep apnea (OSA) and central sleep apnea (CSA) is very high, particularly in patients with heart rhythm disorders and heart failure (HF). Patients with pacemakers (PM) and implantable defibrillators (ICD) including cardiac resynchronization therapy (CRT) show SDB prevalences up to 75%. However, some modern PM, ICD and CRT devices allow the detection of SDB via transthoracic impedance analysis with high sensitivity compared to polysomnographic (PSG) controls. Thus, this method could be of relevance in screening and monitoring SDB in patients with implantable cardiac devices. Preliminary studies demonstrated the possibility to treat OSA in selected patients by stimulation of the cranial nerves, especially the hypoglossal nerve. However, this requires extensive diagnostics and advanced surgical approaches including many medical disciplines and is not part of this review article. However, unilateral and transvenous stimulation of the phrenic nerve to treat central sleep apnea and Cheyne-Stokes respiration in HF patients in particular can be performed by cardiologists. This article summarizes preliminary data on the results of this promising therapy. PMID:24638158

  19. 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

  20. Thoracic Outlet Syndrome Following Breast Implant Rupture

    Directory of Open Access Journals (Sweden)

    Raakhi Mistry, MBChB

    2015-03-01

    Full Text Available Summary: We present a patient with bilateral breast implant rupture who developed severe locoregional silicone granulomatous lymphadenopathy. Poly Implant Prothese silicone implants had been used for bilateral breast augmentation 5 years prior. Extracapsular implant rupture and bilateral axillary lymphadenopathy indicated explantation, capsulectomy, and selective lymph node excision. Histology demonstrated silicone lymphadenopathy with no evidence of malignancy. Over the subsequent 12 months, she developed progressive locoregional lymphadenopathy involving bilateral cervical, axillary, and internal mammary groups, resulting in bilateral thoracic outlet syndrome. We report the unusual presentation, progression, and the ultimate surgical management of this patient.

  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. Ion implantation for combating wear and corrosion

    International Nuclear Information System (INIS)

    Ion implantation provides a means of introducing chosen atomic species into the surface layers of a material or component without the need for heating. Atoms which form strong interatomic bonds, such as nitrogen or carbon, will harden a metal surface and improve wear resistance. Species which impart protection against corrosion, such as nickel, chromium or rare earths can be implanted. Various mechanisms result in a protective layer which far exceeds in thickness the range of implanted ions. Ion implantation is not a coating technique: there is no interface which could form a plane of weakness, nor are there dimensional changes. It is applied to finished components using equipment which will be described. (author)

  3. 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.

  4. Silicone breast implants and connective tissue disease

    DEFF Research Database (Denmark)

    Lipworth, Loren; Holmich, Lisbet R; McLaughlin, Joseph K

    2011-01-01

    The association of silicone breast implants with connective tissue diseases (CTDs), including systemic sclerosis, systemic lupus erythematosus, rheumatoid arthritis, and fibromyalgia, as well as a hypothesized new "atypical" disease, which does not meet established diagnostic criteria for any known...... cosmetic breast implants, or of a rheumatic symptom profile unique to these women. No increased risk of CTDs is evident in women with extracapsular ruptures in two studies, which evaluated risk by implant rupture status, and no consistent association has been observed between silicone breast implants and a...

  5. Abdominally implanted satellite transmitters affect reproduction and survival rather than migration of large shorebirds

    Science.gov (United States)

    Hooijmeijer, Jos C. E. W.; Gill, Robert E., Jr.; Mulcahy, Daniel M.; Tibbitts, T. Lee; Kentie, Rosemarie; Gerritsen, Gerrit J.; Bruinzeel, Leo W.; Tijssen, David C.; Harwood, Christopher M.; Piersma, Theunis

    2014-01-01

    Satellite telemetry has become a common technique to investigate avian life-histories, but whether such tagging will affect fitness is a critical unknown. In this study, we evaluate multi-year effects of implanted transmitters on migratory timing and reproductive performance in shorebirds. Shorebirds increasingly are recognized as good models in ecology and evolution. That many of them are of conservation concern adds to the research responsibilities. In May 2009, we captured 56 female Black-tailed Godwits Limosa limosa limosa during late incubation in The Netherlands. Of these, 15 birds were equipped with 26-g satellite transmitters with a percutaneous antenna (7.8 % ± 0.2 SD of body mass), surgically implanted in the coelom. We compared immediate nest survival, timing of migration, subsequent nest site fidelity and reproductive behaviour including egg laying with those of the remaining birds, a comparison group of 41 females. We found no effects on immediate nest survival. Fledging success and subsequent southward and northward migration patterns of the implanted birds conformed to the expectations, and arrival time on the breeding grounds in 2010–2012 did not differ from the comparison group. Compared with the comparison group, in the year after implantation, implanted birds were equally faithful to the nest site and showed equal territorial behaviour, but a paucity of behaviours indicating nests or clutches. In the 3 years after implantation, the yearly apparent survival of implanted birds was 16 % points lower. Despite intense searching, we found only three eggs of two implanted birds; all were deformed. A similarly deformed egg was reported in a similarly implanted Whimbrel Numenius phaeopus returning to breed in central Alaska. The presence in the body cavity of an object slightly smaller than a normal egg may thus lead to egg malformation and, likely, reduced egg viability. That the use of implanted satellite transmitters in these large shorebirds

  6. Perioperative management of antithrombotic treatment during implantation or revision of cardiac implantable electronic devices

    DEFF Research Database (Denmark)

    Deharo, Jean-Claude; Sciaraffia, Elena; Leclercq, Christophe;

    2016-01-01

    The European Snapshot Survey on Procedural Routines for Electronic Device Implantation (ESS-PREDI) was a prospective European survey of consecutive adults who had undergone implantation/surgical revision of a cardiac implantable electronic device (CIED) on chronic antithrombotic therapy (enrolment...

  7. 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

  8. 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.

  9. Computation of ion implantation uniformity

    International Nuclear Information System (INIS)

    Commercial ion implanters employ a variety of different systems to scan the ion beam over the target. In many of the target scanning systems employed the achievable uniformity of dose has been limited by the chosen geometry. This paper describes a computer program which has been used to calculate the dose uniformity of a number of these systems. The results are presented as iso-dose lines relative to the dose at the centre of the target. The non-uniformities are then directly apparent and the parameters controlling their magnitude can be readily considered by equipment designers, purchasers or users. (author)

  10. Automated design of customized implants

    OpenAIRE

    Chulvi Ramos, Vicente; Cebrián Tarrasón, David; Vidal, Rosario; Sancho, Álex

    2013-01-01

    Este artículo muestra un modelo que se postula como capaz para el diseño de un implante craneal personalizado directamente desde el proceso de toma de imágenes médica. La salida de este proceso de diseño se conseguirá en un formato capaz de ser reconocido por el sistema de manufactura. El sistema propuesto se ha creado a partir de la unión de dos prototipos informáticos desarrollados durante la presente investigación, y a través del estudio de las tecnologías relacionadas o circundantes. El n...

  11. Mometasone implant for chronic rhinosinusitis

    OpenAIRE

    Wei, Calvin C; Kennedy, David W

    2012-01-01

    The Propel mometasone-eluting stent (Intersect ENT, Palo Alto, CA) is the first Food and Drug Administration-approved device for delivering steroid medication into the ethmoid cavity following surgery. The implant is composed of a biodegradable polymer in a lattice pattern that expands in a spring-like fashion to conform to the walls of a dissected ethmoid cavity and contains a total of 370 μg of mometasone furoate designed for gradual release over 30 days. The purpose of this article is to r...

  12. Carbon Fiber Biocompatibility for Implants

    OpenAIRE

    Richard Petersen

    2016-01-01

    Carbon fibers have multiple potential advantages in developing high-strength biomaterials with a density close to bone for better stress transfer and electrical properties that enhance tissue formation. As a breakthrough example in biomaterials, a 1.5 mm diameter bisphenol-epoxy/carbon-fiber-reinforced composite rod was compared for two weeks in a rat tibia model with a similar 1.5 mm diameter titanium-6-4 alloy screw manufactured to retain bone implants. Results showed that carbon-fiber-rein...

  13. 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.

  14. Cochlear implants: response to therapeutic irradiation

    International Nuclear Information System (INIS)

    Purpose: To determine the response of cochlear implants ('bionic ears') to therapeutic irradiation. Methods and Materials: A patient with a cochlear implant was referred for palliative cranial irradiation. As there were no published or manufacturer's data available regarding the response to radiation, implants were tested for functional changes following irradiation. Cochlear implants were supplied by Cochlear Ltd. Two units each of models CI22M, CI22M (with the second generation integrated circuit) and CI24M were irradiated with 4 MV X-rays, and an unirradiated unit of each model was used as a control. The implants were irradiated initially with 25 daily fractions to 50 Gy. To determine the response at higher doses, 10 Gy fractions were delivered to the same implants to 100 Gy, followed by a final fraction of 50 Gy (total dose 150 Gy). The implants were tested after each 10 Gy, up to 100 Gy, and at 150 Gy. Several indicators of functionality were assessed, including RF (radio frequency) link range, and stimulator output current. The radiation shielding effect of the implants was also assessed. Results: Within the dose range ≤ 50 Gy, the stimulator output current of the CI22M units was the only parameter to change. At higher doses (to 150 Gy), changes in current output continued, and gradual loss of RF link range occurred in the CI22M units. The CI24M units showed changes in output current to 100 Gy, and large changes at 150 Gy. Dose attenuation by the implants was measured at 6% for ipsilateral single field 4 MV X-rays. Conclusion: Our results suggest that patients with these cochlear implants can receive cranial irradiation with a low risk of implant failure. Changes in stimulator output current can be compensated simply by re-programming the speech map after the course of radiation treatment

  15. To centralize or not to centralize?

    OpenAIRE

    Campbell, Andrew; Kunisch, Sven; Müller-Stewens, Günter

    2011-01-01

    The CEO's dilemma-were the gains of centralization worth the pain it could cause?-is a perennial one. Business leaders dating back at least to Alfred Sloan, who laid out GM's influential philosophy of decentralization in a series of memos during the 1920s, have recognized that badly judged centralization can stifle initiative, constrain the ability to tailor products and services locally, and burden business divisions with high costs and poor service.1 Insufficient centralization can deny bus...

  16. Graphene Functionalized Scaffolds Reduce the Inflammatory Response and Supports Endogenous Neuroblast Migration when Implanted in the Adult Brain

    Science.gov (United States)

    Zhou, Kun; Motamed, Sepideh; Thouas, George A.; Bernard, Claude C.; Li, Dan; Parkington, Helena C.; Coleman, Harold A.; Finkelstein, David I.; Forsythe, John S.

    2016-01-01

    Electroactive materials have been investigated as next-generation neuronal tissue engineering scaffolds to enhance neuronal regeneration and functional recovery after brain injury. Graphene, an emerging neuronal scaffold material with charge transfer properties, has shown promising results for neuronal cell survival and differentiation in vitro. In this in vivo work, electrospun microfiber scaffolds coated with self-assembled colloidal graphene, were implanted into the striatum or into the subventricular zone of adult rats. Microglia and astrocyte activation levels were suppressed with graphene functionalization. In addition, self-assembled graphene implants prevented glial scarring in the brain 7 weeks following implantation. Astrocyte guidance within the scaffold and redirection of neuroblasts from the subventricular zone along the implants was also demonstrated. These findings provide new functional evidence for the potential use of graphene scaffolds as a therapeutic platform to support central nervous system regeneration. PMID:26978268

  17. Cochlear implantation: a biomechanical prosthesis for hearing loss

    OpenAIRE

    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...

  18. Residual defects following rapid annealing of boron implanted silicon with and without preamorphisation by silicon implantation

    International Nuclear Information System (INIS)

    Implants of boron into silicon which has been made amorphous by silicon implantation have a shallower depth profile than the same implants into silicon. This results in higher activation and restricted diffusion of the B implants after annealing, and there are also significant differences in the microstructure after annealing compared with B implants into silicon. Rapid isothermal heating with an electron beam and furnace treatments are used to characterize the defect structure as a function of time and temperature. Defects are seen to influence the diffusion of non-substitutional boron. (author)

  19. Evaluation of anterior chest wall implanted port: technical aspects, results, and complications

    International Nuclear Information System (INIS)

    To evaluate the technical aspects, results and complications of patients with implanted anterior chest wall port. Between April 1997 and June 1999, a total of 63 implanted ports were placed at the anterior chest wall of 63 consecutive patients by interventional radiologists. The indications were chemotherapy in 61 patients and total parenteral nutrition in two. The peripheral portion of the subclavian vein was punctured under fluoroscopic guidance via ipsilateral peripheral vein during venography. A central venous catheter was placed in the superior vena cava, and using the subcutaneous tunneling method, a connected infusion port was implanted at the anterior chest wall. Results and complications were reviewed, and by means of Kaplan-Meier survival analysis, the expected patency of the port was determined. The technical success rate for implanted port at the anterior chest wall was 100% (63/63 patients). In two patients, hematoma and oozing were treated by compression. The duration of port implantation ranged from 12 to 855 (mean, 187) days, and the port patency rate was 305.7±47.6 days. In seven patients (completed chemotherapy (n=3D3), central venous thrombosis (n=3D3) catheter-related infection (n=3D1)), the port was removed. Catheter obstruction occurred in two patients, and in one, the use of urokinase led to successful recanalization. Sixteen patients died of an underlying malignancy, but no catheter-related death was noted. Implantation of an anterior chest wall port is a safe and useful procedure, with long patency, for patients requiring chemotherapy and long-term venous access. (author)

  20. Modulating macrophage polarization with divalent cations in nanostructured titanium implant surfaces

    Science.gov (United States)

    Lee, Chung-Ho; Kim, Youn-Jeong; Jang, Je-Hee; Park, Jin-Woo

    2016-02-01

    Nanoscale topographical modification and surface chemistry alteration using bioactive ions are centrally important processes in the current design of the surface of titanium (Ti) bone implants with enhanced bone healing capacity. Macrophages play a central role in the early tissue healing stage and their activity in response to the implant surface is known to affect the subsequent healing outcome. Thus, the positive modulation of macrophage phenotype polarization (i.e. towards the regenerative M2 rather than the inflammatory M1 phenotype) with a modified surface is essential for the osteogenesis funtion of Ti bone implants. However, relatively few advances have been made in terms of modulating the macrophage-centered early healing capacity in the surface design of Ti bone implants for the two important surface properties of nanotopography and and bioactive ion chemistry. We investigated whether surface bioactive ion modification exerts a definite beneficial effect on inducing regenerative M2 macrophage polarization when combined with the surface nanotopography of Ti. Our results indicate that nanoscale topographical modification and surface bioactive ion chemistry can positively modulate the macrophage phenotype in a Ti implant surface. To the best of our knowledge, this is the first demonstration that chemical surface modification using divalent cations (Ca and Sr) dramatically induces the regenerative M2 macrophage phenotype of J774.A1 cells in nanostructured Ti surfaces. In this study, divalent cation chemistry regulated the cell shape of adherent macrophages and markedly up-regulated M2 macrophage phenotype expression when combined with the nanostructured Ti surface. These results provide insight into the surface engineering of future Ti bone implants that are harmonized between the macrophage-governed early wound healing process and subsequent mesenchymal stem cell-centered osteogenesis function.

  1. Modulating macrophage polarization with divalent cations in nanostructured titanium implant surfaces.

    Science.gov (United States)

    Lee, Chung-Ho; Kim, Youn-Jeong; Jang, Je-Hee; Park, Jin-Woo

    2016-02-26

    Nanoscale topographical modification and surface chemistry alteration using bioactive ions are centrally important processes in the current design of the surface of titanium (Ti) bone implants with enhanced bone healing capacity. Macrophages play a central role in the early tissue healing stage and their activity in response to the implant surface is known to affect the subsequent healing outcome. Thus, the positive modulation of macrophage phenotype polarization (i.e. towards the regenerative M2 rather than the inflammatory M1 phenotype) with a modified surface is essential for the osteogenesis funtion of Ti bone implants. However, relatively few advances have been made in terms of modulating the macrophage-centered early healing capacity in the surface design of Ti bone implants for the two important surface properties of nanotopography and and bioactive ion chemistry. We investigated whether surface bioactive ion modification exerts a definite beneficial effect on inducing regenerative M2 macrophage polarization when combined with the surface nanotopography of Ti. Our results indicate that nanoscale topographical modification and surface bioactive ion chemistry can positively modulate the macrophage phenotype in a Ti implant surface. To the best of our knowledge, this is the first demonstration that chemical surface modification using divalent cations (Ca and Sr) dramatically induces the regenerative M2 macrophage phenotype of J774.A1 cells in nanostructured Ti surfaces. In this study, divalent cation chemistry regulated the cell shape of adherent macrophages and markedly up-regulated M2 macrophage phenotype expression when combined with the nanostructured Ti surface. These results provide insight into the surface engineering of future Ti bone implants that are harmonized between the macrophage-governed early wound healing process and subsequent mesenchymal stem cell-centered osteogenesis function. PMID:26807875

  2. Dose optimization of intra-operative high dose rate interstitial brachytherapy implants for soft tissue sarcoma

    Directory of Open Access Journals (Sweden)

    Jamema Swamidas

    2009-01-01

    Full Text Available Objective : A three dimensional (3D image-based dosimetric study to quantitatively compare geometric vs. dose-point optimization in combination with graphical optimization for interstitial brachytherapy of soft tissue sarcoma (STS. Materials and Methods : Fifteen consecutive STS patients, treated with intra-operative, interstitial Brachytherapy, were enrolled in this dosimetric study. Treatment plans were generated using dose points situated at the "central plane between the catheters", "between the catheters throughout the implanted volume", at "distances perpendicular to the implant axis" and "on the surface of the target volume" Geometrically optimized plans had dose points defined between the catheters, while dose-point optimized plans had dose points defined at a plane perpendicular to the implant axis and on the target surface. Each plan was graphically optimized and compared using dose volume indices. Results : Target coverage was suboptimal with coverage index (CI = 0.67 when dose points were defined at the central plane while it was superior when the dose points were defined at the target surface (CI=0.93. The coverage of graphically optimized plans (GrO was similar to non-GrO with dose points defined on surface or perpendicular to the implant axis. A similar pattern was noticed with conformity index (0.61 vs. 0.82. GrO were more conformal and less homogeneous compared to non-GrO. Sum index was superior for dose points defined on the surface of the target and relatively inferior for plans with dose points at other locations (1.35 vs. 1.27. Conclusions : Optimization with dose points defined away from the implant plane and on target results in superior target coverage with optimal values of other indices. GrO offer better target coverage for implants with non-uniform geometry and target volume.

  3. Long-term decoding of movement force and direction with a wireless myoelectric implant

    Science.gov (United States)

    Morel, Pierre; Ferrea, Enrico; Taghizadeh-Sarshouri, Bahareh; Marcel Cardona Audí, Josep; Ruff, Roman; Hoffmann, Klaus-Peter; Lewis, Sören; Russold, Michael; Dietl, Hans; Abu-Saleh, Lait; Schroeder, Dietmar; Krautschneider, Wolfgang; Meiners, Thomas; Gail, Alexander

    2016-02-01

    Objective. The ease of use and number of degrees of freedom of current myoelectric hand prostheses is limited by the information content and reliability of the surface electromyography (sEMG) signals used to control them. For example, cross-talk limits the capacity to pick up signals from small or deep muscles, such as the forearm muscles for distal arm amputations, or sites of targeted muscle reinnervation (TMR) for proximal amputations. Here we test if signals recorded from the fully implanted, induction-powered wireless Myoplant system allow long-term decoding of continuous as well as discrete movement parameters with better reliability than equivalent sEMG recordings. The Myoplant system uses a centralized implant to transmit broadband EMG activity from four distributed bipolar epimysial electrodes. Approach. Two Rhesus macaques received implants in their backs, while electrodes were placed in their upper arm. One of the monkeys was trained to do a cursor task via a haptic robot, allowing us to control the forces exerted by the animal during arm movements. The second animal was trained to perform a center-out reaching task on a touchscreen. We compared the implanted system with concurrent sEMG recordings by evaluating our ability to decode time-varying force in one animal and discrete reach directions in the other from multiple features extracted from the raw EMG signals. Main results. In both cases, data from the implant allowed a decoder trained with data from a single day to maintain an accurate decoding performance during the following months, which was not the case for concurrent surface EMG recordings conducted simultaneously over the same muscles. Significance. These results show that a fully implantable, centralized wireless EMG system is particularly suited for long-term stable decoding of dynamic movements in demanding applications such as advanced forelimb prosthetics in a wide range of configurations (distal amputations, TMR).

  4. Depth of electrode insertion and postoperative performance in humans with cochlear implants: a histopathologic study.

    Science.gov (United States)

    Lee, Joonhan; Nadol, Joseph B; Eddington, Donald K

    2010-01-01

    The depth of electrode insertion of a multichannel cochlear implant has been suggested as a clinical variable that may correlate with word recognition using the implant. The current study evaluates this relationship using the human temporal bone collection at the Massachusetts Eye and Ear Infirmary. Twenty-seven temporal bones of subjects with cochlear implants were studied. Temporal bones were removed at autopsy, fixed and prepared for histological study by standard techniques. Specimens were then serially sectioned, and reconstructed by two-dimensional methods. Three measures of length were made from each subject's reconstruction: (1) depth of insertion (DI) of the cochlear implant electrode array, from the round window to the array's apical tip; (2) inserted length (IL) from the cochleostomy to the apical tip of the array, and (3) cochlear duct length (CDL) from the round window to the helicotrema. The active electrode length (AEL) was defined as the distance between the most apical and most basal electrodes of the array. Stepwise regression was used to identify whether subsets of six metrics associated with insertion depth (DI, DI/AEL, DI/CDL, IL, IL/AEL and IL/CDL), duration of deafness, sound-processing strategy, potential for central impairment and age at implantation accounted for significant across-subject variance in the last recorded NU-6 word score measured during each subject's life. Age at implantation and potential for central impairment account for significant percentages of the across-subject variance in NU-6 word scores for the 27 subjects studied. None of the insertion metrics accounted for significant performance variance, even when the variance associated with the other variables was controlled. These results, together with those of previous studies, are consistent with a relatively weak association between electrode insertion depth and speech reception. PMID:20203481

  5. Polylactide-polyglycolide antibiotic implants.

    Science.gov (United States)

    Garvin, Kevin; Feschuk, Connie

    2005-08-01

    Surgeons continually struggle to reduce orthopaedic infections, but no current treatment offers minimum side effects with maximum effectiveness. Antibiotics mixed in plaster of paris have been successful in treating large bony defects in patients with chronic osteomyelitis, and have the advantage of being well tolerated and absorbed by the body. Antibiotics impregnated in polymethylmethacrylate (PMMA) have offered local antibiotic delivery with some success. However, the effect of the antibiotic on the bone cement, the inconsistent elution of the antibiotic, and the need to remove the PMMA implant drives the need for a better system of antibiotic delivery. Polymers or copolymers of antibiotic-impregnated polylactic acid, polyglycolic acid or polyparadioxanone may provide an absorbable system for localized antibiotic delivery. Similar biodegradable systems used to treat small bone fractures have been successful with minimal side effects. In vitro studies have shown promising results of antibiotic elution from bioabsorbable microspheres and beads. Animal in vivo tests have shown that antibiotic impregnated polymers can successfully treat induced osteomyelitis in rabbits and dogs. These studies have provided consistent reproducible results, and now it is time to plan human trials to assess the efficacy of antibiotic microspheres implanted in infected bone and to plan in vivo and in vitro animal testing to investigate the feasibility of antibiotic-polymer-coated components. PMID:16056034

  6. 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

  7. 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.

  8. 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...

  9. 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.)

  10. 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.

  11. Deaf Education: The Impact of Cochlear Implantation?

    Science.gov (United States)

    Archbold, Sue; Mayer, Connie

    2012-01-01

    This paper reviews the impact that cochlear implantation has had on the practice of deaf education in terms of educational placement, communication choices, and educational attainments. Although there is variation in outcome, more children with implants are going to mainstream schools, and using spoken language as their primary means of…

  12. The diagnosis of breast implant rupture

    DEFF Research Database (Denmark)

    Hölmich, Lisbet R; Vejborg, Ilse; Conrad, Carsten; Sletting, Susanne; McLaughlin, Joseph K

    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 ...

  13. New facility for simultaneous implantation and evaporation

    Energy Technology Data Exchange (ETDEWEB)

    Voorthuysen, E.H.duMarchie van

    The Groningen isotope separator has been extended with a double uhv evaporation system. Implantation and evaporation can now be done at the same time under good vacuum conditions. Implanted systems with thicknesses up to 6.3..mu..m have been produced.

  14. New facility for simultaneous implantation and evaporation

    International Nuclear Information System (INIS)

    The Groningen isotope separator has been extended with a double uhv evaporation system. Implantation and evaporation can now be done at the same time under good vacuum conditions. Implanted systems with thicknesses up to 6.3μm have been produced. (author)

  15. 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....

  16. Cochlear Implants: The Young People's Perspective

    Science.gov (United States)

    Wheeler, Alexandra; Archbold, Sue; Gregory, Susan; Skipp, Amy

    2007-01-01

    Cochlear implantation is a relatively new procedure, which has already had significant impact on the lives of many profoundly deaf children and adults, in providing useful hearing to those unable to benefit significantly from hearing aids. After 16 years of cochlear implantation in the United Kingdom, there is now a body of evidence covering a…

  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...

  18. 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)

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

    DEFF Research Database (Denmark)

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

    2007-01-01

    Bone resorption associated with local trauma occurring during insertion of joint prostheses is recognized as an early event. Being an osteoclastic inhibitor, alendronate is a potential candidate means to decrease early periprosthetic bone resorption and thereby improve implant fixation. We...... investigated the influence of oral alendronate treatment on early implant fixation in two implant interface settings representing sites of an implant that are in contact with surrounding bone, and other sites without intimate bone contact. One plasma-sprayed cylindrical titanium implant (6 mm diameter) was...... inserted into each proximal tibia of 16 dogs. On one side the implant was inserted press-fit whereas on the contralateral side, the implants were surrounded by a 2 mm concentric gap. Oral alendronate (0.5 mg/kg/day) was given 2 weeks following surgery to eight dogs. The dogs were euthanized after 10 weeks...

  20. Implant supported overdentures--the Copenhagen experience

    DEFF Research Database (Denmark)

    Gotfredsen, K

    OBJECTIVES: To evaluate the functional and biological effect of implant-supported overdenture treatment in the lower jaw. METHODS AND MATERIALS: Thirty-two patients were consecutively treated with Astra Tech implants in the lower jaw for retaining overdentures. All implants had a diameter of 3.5 mm...... and all but two of the implants were longer than 10 mm. For the implant supported overdentures two methods of attachment were used, a bar or a ball. RESULTS: One of 69 fixtures was lost during the 4-5 year observation period. The mean bone loss for all fixtures was less than 0.2 mm per year....... Complications included 15 fractures of the ball attachment and 26 episodes of looseness of the matrices holding the screw in place. Patient satisfaction with the treatment of the lower jaw was high although 7 patients found that control of the upper denture was poor following treatment. CONCLUSIONS: When the...

  1. Immediate implant placement: a case report.

    Science.gov (United States)

    Chandra Sekar, A; Praveen, M; Saxena, Aarti; Gautam, A

    2012-06-01

    This case report describes extraction of a fractured left maxillary lateral incisor tooth, followed by immediate placement of a dental implant in the prepared socket and temporization by a bonded restoration. The tooth was atraumatically extracted, the socket was prepared to the required depth and a Biohorizon Implant was inserted followed a week later by temporization by a bonded restoration. An impression was made 4 months after implant insertion, and a definitive restoration was placed. The atraumatic operating technique and the immediate insertion of the Implant resulted in the preservation of the hard and soft tissues at the extraction site. The patient exhibited no clinical or radiologic complications through 5 years of clinical monitoring. The dental implant and provisional restoration provided the patient with immediate esthetics, function, comfort, and most importantly preservation of tissues. PMID:23858286

  2. Development of industrial ion implantation technology

    International Nuclear Information System (INIS)

    On a cooperation between KAERI, Kurchatov Institute (Russia), and Mirae Co., development of a metal ion implanter and ion implantation technology is performed on a basic idea of popularization and refinement of ion implantation technology applied to the industrial components. The developed implanter is a two beam type: the mass separation line produces several mA of metal ion beams and the non-separation line produces several tens of mA gas ion beams, thus making the synergistic effect possible by the irradiation of beams from both lines. The target is made of a rotating plate of 60cm in radius and can treat various types of industrial components or parts. About 60 kinds of specimens were treated for the development of implantation technology. Two or five times lengthening of longevities were achieved on the PCB drills, razor blades, cutters, and precision dies. (Author)

  3. 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

  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. PMID:27433052

  6. Mutagenic mechanism on ion implantation of plants

    International Nuclear Information System (INIS)

    Ion beam implantation, as a new mutation technique, has been widely used in mutation breeding, and great achievements have been attained in agriculture and fermentation industry. The mechanism underlying ion beam induced mutagenic effects has been the topic of research in recent years. In this paper, we focus on the initial physical process of ion implantation into organisms, discussing that energy deposit, mass deposit and charge transfer of the implanted ions into target organisms are the main contributions to the bio-effects. Recent advances in the study of transferring of damaging signals in plant sample are also included. It has been observed that targeted ion implantation of shoot apical meristem (SAM) of Arabidopsis embryos induces damage of root apical meristem (RAM), indicating a long distant bystander effect in intact organism. Further studies showed that generation of reactive oxygen species upon ion implantation and auxin-dependent transcription processes could play important roles in the observed bystander effect. (author)

  7. Mutagenic effects of ion implantation on stevia

    International Nuclear Information System (INIS)

    Dry seeds of Stevia were implanted by 75 keV nitrogen and carbon ions with various doses. The biological effects in M1 and mutation in M2 were studied. The results showed that ion beam was able to induce variation on chromosome structure in root tip cells. The rate of cells with chromosome aberration was increased with ion beam dose. The rate of cells with chromosomal aberration was lower than that induced with γ-rays. Frequency of the mutation induced by implantation of N+ and C+ ions were higher than those induced by γ-rays. The rate of cell with chromosome aberration and in M2 useful mutation induced by implantation of C+ ion was higher than those induced by implantation of N+ ion. Mutagenic effects Feng1 x Riyuan and Riyuan x Feng2 by implantation of N+ and C+ were higher than that of Jining and Feng2

  8. Mutagenic effects of ion implanted rice seed

    International Nuclear Information System (INIS)

    Dry seeds of rice were implanted with 15∼30 keV N+, H+, Ar+ ion beam of various doses. The biological effects in M1 and mutation in M2 were studied. The results showed that ion beam could induce the variation on the chromosome structure and inhibit mitosis in root tip cell. The chromosomal aberration rate of cells tended to be increased with increase of implanted ion dose. Compared with 60Co γ-rays, ion implantation induced lower rate of cells with chromosome aberration. However, there was a similar inhibitory effect on mitosis between ion beam and γ-rays. The electrophoretic banding patterns of peroxidase enzymes were altered by both mutagens and varied. Frequency of the chlorophyll mutation implanted by ion beam was higher than that induced by γ-rays. Mutation frequencies of heading date and plant height were similar between ion beam implanting and γ-rays irradiation. (11 tabs., 2 figs.)

  9. Surface characterization of titanium based dental implants; Caracterizacao de implantes odontologicos a base de titanio

    Energy Technology Data Exchange (ETDEWEB)

    Castilho, Guilherme Augusto Alcaraz

    2006-07-01

    Dental implantology uses metallic devices made of commercially pure titanium in order to replace lost teeth. Titanium presents favorable characteristics as bio material and modern implants are capable of integrate, witch is the union between bone and implant without fibrous tissue development. Three of the major Brazilian implant manufacturers were chosen to join the study. A foreign manufacturer participated as standard. The manufacturers had three specimens of each implant with two different surface finishing, as machined and porous, submitted to analysis. Surface chemical composition and implant morphology were analyzed by X-ray photoelectron spectroscopy (XP S), scanning electron microscopy (SEM) and microprobe. Implant surface is mainly composed of titanium, oxygen and carbon. Few contaminants commonly present on implant surface were found on samples. Superficial oxide layer is basically composed of titanium dioxide (TiO{sub 2}), another oxides as Ti O and Ti{sub 2}O{sub 3} were also found in small amount. Carbon on implant surface was attributed to manufacturing process. Nitrogen, Phosphorous and Silicon appeared in smaller concentration on surface. There was no surface discrepancy among foreign and Brazilian made implants. SEM images were made on different magnification, 35 X to 3500 X, and showed similarity among as machined implants. Porous surface finishing implants presented distinct morphology. This result was attributed to differences on manufacturing process. Implant bioactivity was accessed through immersion on simulated body solution (SBF) in order to verify formation of an hydroxyapatite (HA) layer on surface. Samples were divided on three groups according to immersion time: G1 (7 days), G2 (14 days), G3 (21 days), and deep in SBF solution at 37 deg C. After being removed from solution, XPS analyses were made and then implants have been submitted to microprobe analysis. XPS showed some components of SBF solution on sample surface but microprobe

  10. Spectral Analysis Related to Bare-Metal and Drug-Eluting Coronary Stent Implantation

    Directory of Open Access Journals (Sweden)

    Rose Mary Ferreira Lisboa da Silva

    2014-08-01

    Full Text Available Background: The autonomic nervous system plays a central role in cardiovascular regulation; sympathetic activation occurs during myocardial ischemia. Objective: To assess the spectral analysis of heart rate variability during stent implantation, comparing the types of stent. Methods: This study assessed 61 patients (mean age, 64.0 years; 35 men with ischemic heart disease and indication for stenting. Stent implantation was performed under Holter monitoring to record the spectral analysis of heart rate variability (Fourier transform, measuring the low-frequency (LF and high-frequency (HF components, and the LF/HF ratio before and during the procedure. Results: Bare-metal stent was implanted in 34 patients, while the others received drug-eluting stents. The right coronary artery was approached in 21 patients, the left anterior descending, in 28, and the circumflex, in 9. As compared with the pre-stenting period, all patients showed an increase in LF and HF during stent implantation (658 versus 185 ms2, p = 0.00; 322 versus 121, p = 0.00, respectively, with no change in LF/HF. During stent implantation, LF was 864 ms2 in patients with bare-metal stents, and 398 ms2 in those with drug-eluting stents (p = 0.00. The spectral analysis of heart rate variability showed no association with diabetes mellitus, family history, clinical presentation, beta-blockers, age, and vessel or its segment. Conclusions: Stent implantation resulted in concomitant sympathetic and vagal activations. Diabetes mellitus, use of beta-blockers, and the vessel approached showed no influence on the spectral analysis of heart rate variability. Sympathetic activation was lower during the implantation of drug-eluting stents.

  11. Spectral Analysis Related to Bare-Metal and Drug-Eluting Coronary Stent Implantation

    International Nuclear Information System (INIS)

    The autonomic nervous system plays a central role in cardiovascular regulation; sympathetic activation occurs during myocardial ischemia. To assess the spectral analysis of heart rate variability during stent implantation, comparing the types of stent. This study assessed 61 patients (mean age, 64.0 years; 35 men) with ischemic heart disease and indication for stenting. Stent implantation was performed under Holter monitoring to record the spectral analysis of heart rate variability (Fourier transform), measuring the low-frequency (LF) and high-frequency (HF) components, and the LF/HF ratio before and during the procedure. Bare-metal stent was implanted in 34 patients, while the others received drug-eluting stents. The right coronary artery was approached in 21 patients, the left anterior descending, in 28, and the circumflex, in 9. As compared with the pre-stenting period, all patients showed an increase in LF and HF during stent implantation (658 versus 185 ms2, p = 0.00; 322 versus 121, p = 0.00, respectively), with no change in LF/HF. During stent implantation, LF was 864 ms2 in patients with bare-metal stents, and 398 ms2 in those with drug-eluting stents (p = 0.00). The spectral analysis of heart rate variability showed no association with diabetes mellitus, family history, clinical presentation, beta-blockers, age, and vessel or its segment. Stent implantation resulted in concomitant sympathetic and vagal activations. Diabetes mellitus, use of beta-blockers, and the vessel approached showed no influence on the spectral analysis of heart rate variability. Sympathetic activation was lower during the implantation of drug-eluting stents

  12. Spectral Analysis Related to Bare-Metal and Drug-Eluting Coronary Stent Implantation

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Rose Mary Ferreira Lisboa da, E-mail: roselisboa@cardiol.br [Faculdade de Medicina da UFMG, Divinópolis, MG (Brazil); Silva, Carlos Augusto Bueno [Faculdade de Medicina da UFMG, Divinópolis, MG (Brazil); Belo Horizonte, Hospital São João de Deus, Divinópolis, MG (Brazil); Greco, Otaviano José [Belo Horizonte, Hospital São João de Deus, Divinópolis, MG (Brazil); Moreira, Maria da Consolação Vieira [Faculdade de Medicina da UFMG, Divinópolis, MG (Brazil)

    2014-08-15

    The autonomic nervous system plays a central role in cardiovascular regulation; sympathetic activation occurs during myocardial ischemia. To assess the spectral analysis of heart rate variability during stent implantation, comparing the types of stent. This study assessed 61 patients (mean age, 64.0 years; 35 men) with ischemic heart disease and indication for stenting. Stent implantation was performed under Holter monitoring to record the spectral analysis of heart rate variability (Fourier transform), measuring the low-frequency (LF) and high-frequency (HF) components, and the LF/HF ratio before and during the procedure. Bare-metal stent was implanted in 34 patients, while the others received drug-eluting stents. The right coronary artery was approached in 21 patients, the left anterior descending, in 28, and the circumflex, in 9. As compared with the pre-stenting period, all patients showed an increase in LF and HF during stent implantation (658 versus 185 ms2, p = 0.00; 322 versus 121, p = 0.00, respectively), with no change in LF/HF. During stent implantation, LF was 864 ms2 in patients with bare-metal stents, and 398 ms2 in those with drug-eluting stents (p = 0.00). The spectral analysis of heart rate variability showed no association with diabetes mellitus, family history, clinical presentation, beta-blockers, age, and vessel or its segment. Stent implantation resulted in concomitant sympathetic and vagal activations. Diabetes mellitus, use of beta-blockers, and the vessel approached showed no influence on the spectral analysis of heart rate variability. Sympathetic activation was lower during the implantation of drug-eluting stents.

  13. Allogenic implantable rat model of hepatocellular carcinoma and its MRI-properties

    International Nuclear Information System (INIS)

    Objective: By using allogenic implantable techniques, to establish an ideal ACI-rat model of hepatocellular carcinoma suitable for interventional therapy and magnetic resonance imaging (MRI). Methods: Morris Hepatoma 3924 A was implanted subcutaneously on the back of a male ACI-rat. 13 days later, the subcutaneous growing solid tumor was explanted from the donor animal and minced into small cubes of about 1 mm3 volume. Afterwards, the solid tumor fragments were inserted into the subcapsular pocket of the liver in 12 male ACI-rat. After 14 days of this allogenic implantation, MRI was performed for analyzing the tumor growth and its characters. The tumor preparations were taken out for pathological examination. Results: An isolated and solitary liver tumor was found in all 12 animals on MRI (14 days post implantation), none of them had metastases or ascites. Tumor size was (0.090 +- 0.008) cm3. The tumors were hypointense on T1WI and hyperintense on T2WI. No central tumor necrosis or hemorrhage was observed by the pathological examination of the sections. The tumor was supplied with plenty of blood vessels. Conclusion: The above-described method is easy to operate and reproduce. Ideal rate of implantation, appropriate tumor growth rate, the absence of metastases and ascites, and optimal effects of MRI for observing the tumor pattern made this tumor model highly suitable for the study of interventional therapy

  14. Use of demineralized bone as an osteoinductive orbital enucleation implant in the rabbit.

    Science.gov (United States)

    Sires, B S; Geggel, H S; Heffernan, J T; Crane, R D; Holds, J B

    1993-06-01

    Implanted allogeneic demineralized bone particles (DBP) may be transformed into endochondral bone by inductive or conductive new bone formation. Using a rabbit model, enucleation or evisceration was performed, and DBP was implanted into the socket. Histology confirmed endochondral bone formation in both groups. A morphologic difference existed between enucleation and evisceration: compact bone was produced following evisceration, and cancellous bony spheres were formed following enucleation. Serial quantitative computed tomography (qCT) was performed to monitor mineral density and proved to be an ideal technique to monitor bone mineralization noninvasively in the postoperative orbit. Bone mineral density (BMD, mg/ml) increased approximately 300% in DBP implanted orbits when compared to controls at 6 weeks. The ideal mass/volume ratio of DBP to socket volume was 400 mg/ml. The rapidly formed bone is well vascularized and creates a stable integrated orbital implant, following enucleation and evisceration surgery. DBP implantation into the central orbit results in inductive bone formation with interesting potential in socket and orbit reconstruction. PMID:8323902

  15. Analgesia Induced by Isolated Bovine Chromaffin Cells Implanted in Rat Spinal Cord

    Science.gov (United States)

    Sagen, Jacqueline; Pappas, George D.; Pollard, Harvey B.

    1986-10-01

    Chromaffin cells synthesize and secrete several neuroactive substances, including catecholamines and opioid peptides, that, when injected into the spinal cord, induce analgesia. Moreover, the release of these substances from the cells can be stimulated by nicotine. Since chromaffin cells from one species have been shown to survive when transplanted to the central nervous system of another species, these cells are ideal candidates for transplantation to alter pain sensitivity. Bovine chromaffin cells were implanted into the subarachnoid space of the lumbar spinal region in adult rats. Pain sensitivity and response to nicotine stimulation was determined at various intervals following cell implantation. Low doses of nicotine were able to induce potent analgesia in implanted animals as early as one day following their introduction into the host spinal cord. This response could be elicited at least through the 4 months the animals were tested. The induction of analgesia by nicotine in implanted animals was dose related. This analgesia was blocked by the opiate antagonist naloxone and partially attenuated by the adrenergic antagonist phentolamine. These results suggest that the analgesia is due to the stimulated release of opioid peptides and catecholamines from the implanted bovine chromaffin cells and may provide a new therapeutic approach for the relief of pain.

  16. Reliability evaluation of alumina-blasted/acid-etched versus laser-sintered dental implants.

    Science.gov (United States)

    Almeida, Erika O; Júnior, Amilcar C Freitas; Bonfante, Estevam A; Silva, Nelson R F A; Coelho, Paulo G

    2013-05-01

    Step-stress accelerated life testing (SSALT) and fractographic analysis were performed to evaluate the reliability and failure modes of dental implant fabricated by machining (surface treated with alumina blasting/acid etching) or laser sintering for anterior single-unit replacements. Forty-two dental implants (3.75 × 10 mm) were divided in two groups (n=21 each): laser sintered (LS) and alumina blasting/acid etching (AB/AE). The abutments were screwed to the implants and standardized maxillary central incisor metallic crowns were cemented and subjected to SSALT in water. Use-level probability Weibull curves and reliability for a mission of 50,000 cycles at 200 N were calculated. Polarized light and scanning electron microscopes were used for failure analyses. The Beta (β) value derived from use-level probability Weibull calculation of 1.48 for group AB/AE indicated that damage accumulation likely was an accelerating factor, whereas the β of 0.78 for group LS indicated that load alone likely dictated the failure mechanism for this group, and that fatigue damage did not appear to accumulate. The reliability was not significantly different (p>0.9) between AB/AE (61 %) and LS (62 %). Fracture of the abutment and fixation screw was the chief failure mode. No implant fractures were observed. No differences in reliability and fracture mode were observed between LS and AB/AE implants used for anterior single-unit crowns. PMID:22843309

  17. Gelatine-embedded electrodes—a novel biocompatible vehicle allowing implantation of highly flexible microelectrodes

    Science.gov (United States)

    Lind, Gustav; Eriksson Linsmeier, Cecilia; Thelin, Jonas; Schouenborg, Jens

    2010-08-01

    Chronic neural interfaces that are both structurally and functionally stable inside the brain over years or decades hold great promise to become an invaluable clinical tool in the near future. A key flaw in the current electrode interfaces is that their recording capabilities deteriorate over time, possibly due to the lack of flexibility, which causes movements in relation to the neural tissue that result in small inflammations and loss of electrode function. We have developed a new neural probe using the stabilizing property of gelatine that allows the implantation of ultra-thin and flexible electrodes into the central nervous system. The microglial and astrocytic reactions evoked by implanted gelatine needles, as well as the wire bundles in combination with gelatine, were investigated using immunohistochemistry and fluorescence microscopy up to 12 weeks after implantation. The results indicate that pure gelatine needles were stiff enough to penetrate the brain tissue on their own, and evoked a significantly smaller chronic scar than stab wounds. Moreover, gelatine embedding appeared to reduce the acute reactions caused by the implants and we found no adverse effects of gelatine or gelatine-embedded electrodes. Successful electrophysiological recordings were made from very thin electrodes implanted in this fashion.

  18. The site of action of intrahypothalamic estrogen implants in feminine sexual behavior: an autoradiographic analysis

    International Nuclear Information System (INIS)

    Estrogenic stimulation of the ventromedial hypothalamus is sufficient to prime progesterone-facilitated estrous behavior in ovariectomized rats. To determine precisely the site(s) of estrogenic stimulation and the locus of its priming action on estrous behavior, we used steroid autoradiographic methods to assess the diffusion of [3H]estradiol ([3H]E2) from behaviorally effective implants diluted 1:300 with cholesterol. Ovariectomized rats received [3H]E2-cholesterol implants aimed at the ventromedial hypothalamic nucleus (VMN). Females were tested twice for feminine sexual behavior after stereotaxic surgery. They received progesterone on the day of behavioral testing. Animals were killed on the day after the second behavior test, cannulae were removed, and the brains were frozen rapidly and processed for autoradiography. Five of eight females with bilateral implants aimed at the VMN exhibited female sexual behavior in at least one of the two tests. Of these, four also showed proceptive behavior. Histological examination of brain sections indicated that behaviorally effective implants were located in, or adjacent to, the central portions of VMN. Implants from nonreceptive animals were located at the extreme anterior or posterior aspects of the VMN. The data collected are consistent with the view that estrogen acts within a sharply defined region of the VMN to prime estrons behavior

  19. 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

  20. 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.

  1. Placement of a Port Catheter Through Collateral Veins in a Patient with Central Venous Occlusion

    International Nuclear Information System (INIS)

    Long-term utilization of central venous catheters (CVCs) for parenteral nutrition has a high incidence of central venous complications including infections, occlusions, and stenosis. We report the case of a 31-year-old woman presenting with a malabsorption caused by short gut syndrome due to congenital aganglionic megacolon. The patient developed a chronic occlusion of all central neck and femoral veins due to long-term use of multiple CVCs over more than 20 years. In patients with central venous occlusion and venous transformation, the implantation of a totally implanted port system by accessing collateral veins is an option to continue long-term parenteral nutrition when required. A 0.014-in. Whisper guidewire (Terumo, Tokyo) with high flexibility and steerability was chosen to maneuver and pass through the collateral veins. We suggest this approach to avoid unfavorable translumbar or transhepatic central venous access and to conserve the anatomically limited number of percutaneous access sites.

  2. Effect of membranes and porous hydroxyapatite on healing in bone defects around titanium dental implants. An experimental study in monkeys

    DEFF Research Database (Denmark)

    Gotfredsen, K; Warrer, K; Hjørting-Hansen;

    1991-01-01

    edentulous areas in each of 7 monkeys. A titanium implant was then placed centrally in each defect, and in each monkey, the defects were treated with 1 of the following 4 treatment modalities: (1) coverage with PTFE membrane; (2) grafting of HA and covering with a PTFE membrane; (3) HA grafting; (4) no...

  3. Camouflage of Severe Skeletal Class II Gummy Smile Patient Treated Nonsurgically with Mini Implants

    Directory of Open Access Journals (Sweden)

    Irfan Qamruddin

    2014-01-01

    Full Text Available Skeletal class II has always been a challenge in orthodontics and often needs assistance of surgical orthodontics in nongrowing patients when it presents with severe discrepancy. Difficulty increases more when vertical dysplasia is also associated with sagittal discrepancy. The advent of mini implants in orthodontics has broadened the spectrum of camouflage treatment. This case report presents a 16-year-old nongrowing girl with severe class II because of retrognathic mandible, and anterior dentoalveolar protrusion sagittally and vertically resulted in severe overjet of 13 mm and excessive display of incisors and gums. Both maxillary central incisors were trimmed by general practitioner few years back to reduce visibility. Treatment involved use of micro implant for retraction and intrusion of anterior maxillary dentoalveolar segment while lower incisors were proclined to obtain normal overjet, and overbite and pleasing soft tissue profile. Smile esthetics was further improved with composite restoration of incisal edges of both central incisors.

  4. Change in macular thickness in a case of refractory diabetic macular edema with dexamethasone intravitreal implant in comparison to intravitreal bevacizumab: A case report

    OpenAIRE

    Ashish Sharma; Rangasamy J Madhusudhan; Vidhya Nadahalli; Damgude, Shreekant A; Sundaramoorthy, Selva K

    2012-01-01

    We report on the significant improvement of central macular thickness in a case of clinically significant macular edema after dexamethasone 0.7 mg sustained-release intravitreal implant (Ozurdex®; Allergan, Inc, Irvine, CA, USA). Patient presented to us with persistent clinically significant macular edema (CSME) in both eyes. Right eye received dexamethasone implant and left eye received two intravitreal bevacizumab injections 1.25 mg/0.05 mL (Avastin®; Genentech Inc., South San Francisco, CA...

  5. 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.

  6. 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 (pmold etching technique, can produce substantially rougher surfaces on zirconia implants. PMID:26235717

  7. 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

  8. 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.

  9. 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.

  10. 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

  11. 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.

  12. 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)

  13. Cd ion implantation in AlN

    International Nuclear Information System (INIS)

    Highlights: ► Cd ion implanted in AlN thin films. ► XRD shows damage produced during implantation. ► Annealing recovers damage in low fluence sample. ► RBS/C measurements show that Cd occupies substitutional sites. ► Cd can be a good candidate for p-type doping. - Abstract: AlN thin films were implanted with cadmium, to fluences of 1 × 1013 and 8 × 1014 at/cm2. The implanted samples were annealed at 950 °C under flowing nitrogen. Although implantation damage in AlN is known to be extremely stable the crystal could be fully recovered at low fluences. At high fluences the implantation damage was only partially removed. Implantation defects cause an expansion of the c-lattice parameter. For the high fluence sample the lattice site location of the ions was studied by Rutherford Backscattering/Channelling Spectrometry. Cd ions are found to be incorporated in substitutional Al sites in the crystal and no significant diffusion is seen upon thermal annealing. The observed high solubility limit and site stability are prerequisite for using Cd as p-type dopant in AlN.

  14. VISUAL OUTCOME OF PHACOEMULSIFICATION WITH THE HYDROPHILIC IOL IMPLANTATION IN COMPLICATED CATARACT SECONDARY TO UVEITIS

    OpenAIRE

    Jayshri V; Mona; Ashok H

    2015-01-01

    AIM: To study the Visual outcome of Phacoemulsification with the hydrophilic IOL implantation in complicated cataract secondary to uveitis. METHOD: This was a prospective study on 40 eyes of 40 patients with uveitic cataract, who underwent Phacoemulsification with hydrophilic IOL at a tertiary care centre in central India over a period of 2 years. In our study after preoperative control of inflammation for minimum 3 months Phacoemulsification was performed and results were obs...

  15. 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.

  16. 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.

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

    Directory of Open Access Journals (Sweden)

    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

  18. Central Neuropathic Pain Syndromes.

    Science.gov (United States)

    Watson, James C; Sandroni, Paola

    2016-03-01

    Chronic pain is common in patients with neurologic complications of a central nervous system insult such as stroke. The pain is most commonly musculoskeletal or related to obligatory overuse of neurologically unaffected limbs. However, neuropathic pain can result directly from the central nervous system injury. Impaired sensory discrimination can make it challenging to differentiate central neuropathic pain from other pain types or spasticity. Central neuropathic pain may also begin months to years after the injury, further obscuring recognition of its association with a past neurologic injury. This review focuses on unique clinical features that help distinguish central neuropathic pain. The most common clinical central pain syndromes-central poststroke pain, multiple sclerosis-related pain, and spinal cord injury-related pain-are reviewed in detail. Recent progress in understanding of the pathogenesis of central neuropathic pain is reviewed, and pharmacological, surgical, and neuromodulatory treatments of this notoriously difficult to treat pain syndrome are discussed. PMID:26944242

  19. NIDDK Central Repository

    Data.gov (United States)

    U.S. Department of Health & Human Services — The NIDDK Central Repository stores biosamples, genetic and other data collected in designated NIDDK-funded clinical studies. The purpose of the NIDDK Central...

  20. 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

  1. 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.

  2. The Centrality of Organization Design

    Directory of Open Access Journals (Sweden)

    Raymond E. Miles

    2012-05-01

    Full Text Available I am excited about this new journal focused on the subject of organization design. In my view, organization design is a central issue in the field of management. Designing an organization requires an understanding of strategy, as we pointed out some time ago (Miles & Snow, 1978. For example, if you want to be a prospector (a first-mover strategy, you have to design your firm to move quickly in new directions, which is likely to require that it be arranged so that various kinds of teams can interact across organizational units and levels. Designing an organization to follow a first-mover strategy also requires both an understanding of leadership and a commitment to the free flow of information throughout the organization. Leaders must understand how cross-functional teams pursue ideas and opportunities, and they must facilitate collaborative knowledge sharing to drive innovations that help the firm operate entrepreneurially. Because an organization is a complex, dynamic system, perhaps no other single topic is so deeply implanted at the core of management, organization theory, and organizational behavior as organization design. Moreover, organization design once was, and could be again, the topic of an ongoing dialogue between managers and academics focused on business organizations.

  3. 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.

  4. Implanting radio transmitters in wintering canvasbacks

    Science.gov (United States)

    Olsen, G.H.; Dein, F.J.; Haramis, G.M.; Jorde, D.G.

    1992-01-01

    To conduct telemetry studies of wintering canvasbacks (Aythya valisineria) on Chesapeake Bay, we needed to devise a suitable method of radio transmitter attachment. We describe an aseptic, intra-abdominal surgical technique, using the inhalation anesthetic isoflurane, to implant 20-g radio transmitters in free-ranging canvasbacks. We evaluated the technique over 3 winters (1987-89), when an annual average of 83 female canvasbacks received implant surgery during a 9-day period in mid-December. Of 253 ducks, 248 (98%) were implanted successfully, and 200 (80.6%) completed the 70-day study until early March. No mortality or abnormal behavior from surgery was identified post-release.

  5. 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.

  6. 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...

  7. 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.

  8. Implant shape optimization using reverse FEA

    Science.gov (United States)

    Gladilin, Evgeny; Ivanov, A.; Roginsky, V.

    2005-04-01

    This work presents a novel approach for the physically-based optimization of individual implants in cranio-maxillofacial surgery. The proposed method is based on solving an inverse boundary value problem of the cranio-maxillofacial surgery planning, i.e. finding an optimal implant shape for a desired correction of soft tissues. The paper describes the methodology for the generation of individual geometrical models of human head, the reverse finite element approach for solving biomechanical boundary value problems and two clinical studies dealing with the computer aided design of individual craniofacial implants.

  9. 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

  10. Atraumatic extraction, implant placement and immediate provisionalization.

    Science.gov (United States)

    Tavarez, Rudys Rodolfo de Jesus; Calixto, Amanda Martins; Maia Filho, Etevaldo Matos; Bandeca, Matheus Coelho; Firoozmand, Leily Macedo; Gomes, Mario Gilson Nina; Malheiros, Adriana Santos

    2014-01-01

    Front tooth extraction typically results in significant loss of hard and soft tissue volume, both in the vestibular-lingual and mesiodistal directions. As these changes can compromise the esthetic results of prosthetic rehabilitation, extraction techniques that cause minimal trauma to the remnant tissues are applied in combination with immediate implant placement to minimize such alterations. The case reported in the present article illustrates a therapeutic plan consisting of atraumatic extraction followed by immediate implant placement and provisionalization. When carefully indicated and planned, our results indicate that this technique may provide promising immediate results relative to the maintenance and stability of the peri-implanted tissues. PMID:25576122

  11. 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

  12. Aligned ion implantation using scanning probes

    OpenAIRE

    Persaud, Arun

    2007-01-01

    A new technique for precision ion implantation has been developed. A scanning probe has been equipped with a small aperture and incorporated into an ion beamline, so that ions can be implanted through the aperture into a sample. By using a scanning probe the target can be imaged in a non-destructive way prior to implantation and the probe together with the aperture can be placed at the desired location with nanometer precision. In this work first results of a scanning probe integrated into an...

  13. 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...

  14. 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.

  15. Music perception with cochlear implants: a review.

    Science.gov (United States)

    McDermott, Hugh J

    2004-01-01

    The acceptance of cochlear implantation as an effective and safe treatment for deafness has increased steadily over the past quarter century. The earliest devices were the first implanted prostheses found to be successful in compensating partially for lost sensory function by direct electrical stimulation of nerves. Initially, the main intention was to provide limited auditory sensations to people with profound or total sensorineural hearing impairment in both ears. Although the first cochlear implants aimed to provide patients with little more than awareness of environmental sounds and some cues to assist visual speech-reading, the technology has advanced rapidly. Currently, most people with modern cochlear implant systems can understand speech using the device alone, at least in favorable listening conditions. In recent years, an increasing research effort has been directed towards implant users' perception of nonspeech sounds, especially music. This paper reviews that research, discusses the published experimental results in terms of both psychophysical observations and device function, and concludes with some practical suggestions about how perception of music might be enhanced for implant recipients in the future. The most significant findings of past research are: (1) On average, implant users perceive rhythm about as well as listeners with normal hearing; (2) Even with technically sophisticated multiple-channel sound processors, recognition of melodies, especially without rhythmic or verbal cues, is poor, with performance at little better than chance levels for many implant users; (3) Perception of timbre, which is usually evaluated by experimental procedures that require subjects to identify musical instrument sounds, is generally unsatisfactory; (4) Implant users tend to rate the quality of musical sounds as less pleasant than listeners with normal hearing; (5) Auditory training programs that have been devised specifically to provide implant users with

  16. Central and peripheral demyelination

    OpenAIRE

    Man Mohan Mehndiratta; Natasha Singh Gulati

    2014-01-01

    Several conditions cause damage to the inherently normal myelin of central nervous system, perepheral nervous system or both central and perepheral nervous system and hence termed as central demyelinating diseases, perepheral demyelinating diseases and combined central and perepheral demyelinating diseases respectively. Here we analysed and foccused on the etiology, prevalance, incidence and age of these demyelinating disorders. Clinical attention and various diagnostic tests are needed to ad...

  17. 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 in...

  18. 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...

  19. 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.

  20. 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

  1. 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...

  2. 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...

  3. 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...

  4. 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)

  5. Modification of He implantation induced defects using fluorine co-implantation

    International Nuclear Information System (INIS)

    During device manufacture, metal contamination has a large effect on silicon-based device performance. Of the available gettering techniques, helium implantation is widely used but the high fluence required is a major drawback. In this paper, the impact of F co-implantation on He implantation-induced defects has been carefully studied. Firstly, our results show that both interstitial and vacancy defects are present in the defect band for all implantation conditions. We show that F implantation may lead to cavity formation at high temperature as expected. The TEM observations also show that, at high temperature, the shape and size of the He-induced defects are significantly affected by the fluorine co-implantation. In particular, cavities are drastically modified by the addition of F, which promotes cavity growth. These results enable us to understand the defect interactions better and constitute a good background to gettering techniques for future device processing

  6. 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.

  7. Diagnosis of breast implant rupture using magnetic resonance imaging

    International Nuclear Information System (INIS)

    At least 20,000 Norwegian woman have silicone breast implants, either for breast augmentation or for reconstruction. One of the complications associated with breast implants is rupture of the implants. Magnetic resonance imaging (MRI) has been shown to be the most accurate imaging modality for evaluating the integrity of breast implants. Recognition of the different types of implants and the appearance of normal implants on MRI is very important for distinguishing these from intracapsular and extracapsular ruptures. Examples are shown of MRI findings in normal and ruptured implants. 16 refs., 6 figs

  8. 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.

  9. Re-stability of dental implants following treatment of peri-implantitis

    OpenAIRE

    Javed, Fawad; Hussain, Hamza Ather; Romanos, Georgios E.

    2013-01-01

    It is hypothesized that active treatment of peri-implantitis (PI) leads to re-stabilization of dental implants. The aim was to assess whether or not dental implants can re-stabilize following treatment of PI. To address the focused question, MEDLINE/PubMed and Google-Scholar databases were explored from 1977 up to and including August 2013. Any disagreements between the authors were resolved via discussion. Articles published only in English were included. Hand searching was...

  10. 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

  11. Restoration of divergent implants with a 2-piece screw-retained fixed, complete dental implant prostheses.

    Science.gov (United States)

    Pelekanos, Stavros; Pozidi, Georgia; Kourtis, Stefanos

    2016-04-01

    Restoring a severely resorbed maxilla is challenging because of poor bone quality and the resorptive pattern that follows tooth loss. When bone augmentation is not possible, implants are placed in suboptimal positions, making the prosthetic rehabilitation more complex. This report presents the steps used to rehabilitate a severely resorbed maxilla with divergent implants, using an implant-supported 2-piece screw-retained prosthesis. PMID:26597464

  12. Osseointegration of zirconia implants: an SEM observation of the bone-implant interface

    OpenAIRE

    Naujoks Christian; Handschel Jörg; Lammers Lydia; Mahn Eduardo; Ommerborn Michelle; Zipprich Holger; Depprich Rita; Wiesmann Hans-Peter; Kübler Norbert R; Meyer Ulrich

    2008-01-01

    Abstract Background The successful use of zirconia ceramics in orthopedic surgery led to a demand for dental zirconium-based implant systems. Because of its excellent biomechanical characteristics, biocompatibility, and bright tooth-like color, zirconia (zirconium dioxide, ZrO2) has the potential to become a substitute for titanium as dental implant material. The present study aimed at investigating the osseointegration of zirconia implants with modified ablative surface at an ultrastructural...

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

    OpenAIRE

    Carolina Damayanti Marpaung; Ruth Nadia Susilo; Leonard Nelwan

    2015-01-01

    Immediate loading of dental implant has been researched intensively in the development of Branemark’s early concept of 2 stages implant placement. This was embarked from both patients and practiitioner’s convenience towards a simpler protocol and shorter time frame. Many recent researchers later found that micromotions derived from occlusal loading for a certain degree, instead of resulting a fibrous tissue encapsulation, can enhance the osseointegration process. Dental Implant system enhance...

  14. 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.

  15. 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

  16. 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.

  17. 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.

  18. 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

  19. 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

  20. 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.

  1. 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

  2. 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.

  3. The effect of additional high dose carbon implantation on the tribological properties of titanium implanted steel

    International Nuclear Information System (INIS)

    The tribological properties and the structural changes of hardened steel implanted with titanium followed by carbon were investigated as a function of additional carbon dose. The dose of Ti was 5.1017 Ti cm-2 and the additional C doses were 0, 4.1017, 8.1017 and 1.2.1018 Ccm-2. After Ti implantation, the steel surface transformed to a Fe-Ti-C ternary amorphous phase. Additional implantation of carbon to a dose of 4.1017 Ccm-2 produced fine TiC precipitates dispersed in the ternary amorphous matrix. When the additional C dose exceeded 8.1017 Ccm-2, very fine graphite precipitates appeared in the ternary amorphous phase. The steel surface with very fine graphite precipitates exhibited superior tribological properties. The benefits provided by additional high dose carbon implantation are considered as follows: strengthening of the amorphous phase, thickening of the modified layer, dispersion strengthening of the implanted layer by very fine graphite precipitates and lubrication effect by graphite particles. Comparing the friction properties of Ti+C implanted steel with that of C implanted steel, the role of Ti implantation is to reduce the friction of the surface during sliding and the role of C implantation is to increase the lifetime of the surface against wear. (orig.)

  4. Plasma-implantation-based surface modification of metals with single-implantation mode

    Science.gov (United States)

    Tian, X. B.; Cui, J. T.; Yang, S. Q.; Fu, Ricky K. Y.; Chu, Paul K.

    2004-12-01

    Plasma ion implantation has proven to be an effective surface modification technique. Its biggest advantage is the capability to treat the objects with irregular shapes without complex manipulation of target holder. Many metal materials such as aluminum, stainless steel, tool steel, titanium, magnesium etc, has been treated using this technique to improve their wear-resistance, corrosion-resistance, fatigue-resistance, oxidation-resistance, bio-compatiblity etc. However in order to achieve thicker modified layers, hybrid processes combining plasma ion implantation with other techniques have been frequently employed. In this paper plasma implantation based surface modification of metals using single-implantation mode is reviewed.

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

    International Nuclear Information System (INIS)

    A biodegradable, β-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 β-emitter 32P. The influence of ion implantation and gamma sterilisation on degradation and 32P-fixation behavior has been studied by ion beam and chemical analysis. Irradiation effects due to the applied ion fluence (1015 ions/cm2) and gamma dose (25 kGy) are found to be tolerable

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

    Science.gov (United States)

    Assmann, W.; Schubert, M.; Held, A.; Pichler, A.; Chill, A.; Kiermaier, S.; Schlösser, K.; Busch, H.; Schenk, K.; Streufert, D.; Lanzl, I.

    2007-04-01

    A biodegradable, β-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 β-emitter 32P. The influence of ion implantation and gamma sterilisation on degradation and 32P-fixation behavior has been studied by ion beam and chemical analysis. Irradiation effects due to the applied ion fluence (1015 ions/cm2) and gamma dose (25 kGy) are found to be tolerable.

  7. 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.

  8. 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

  9. 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.

  10. 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.

  11. 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

  12. 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

  13. 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.

  14. Ion implanted Bragg endash Fresnel lens

    International Nuclear Information System (INIS)

    We have investigated the feasibility of widening the bandpath of the Bragg endash Fresnel optical element through the use of ion implantation. The focusing properties of Bragg endash Fresnel lenses (BFLs) were studied as a function of the implantation dose and energy. An enhancement of the focus intensity of up to 15% was found, which is less than expected. Due to the complicated scattering of the low energy ions inside the micrometer- and submicrometer-sized crystal features that make up the BFL relief, the implantation technology destroys the peripheral zones of the BFL more than it increases the intensity in the focus. Nevertheless we believe that high energy implantation can be successfully used to modify the BFL reflectivity, especially in the case of nearly backscattering reflection. copyright 1996 American Institute of Physics

  15. 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...

  16. 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.

  17. Cell growing on ion implanted polytetrafluorethylene

    Energy Technology Data Exchange (ETDEWEB)

    Kondyurina, I., E-mail: i.kondyurina@gmail.com [School of Medicine, University of Sydney, Sydney (Australia); Shardakov, I. [Institute of Continuous Media Mechanics, Russian Academy of Science, Perm (Russian Federation); Nechitailo, G. [Institute of Biochemical Physics, Russian Academy of Science, Moscow (Russian Federation); Terpugov, V. [Perm State University, Perm (Russian Federation); Kondyurin, A. [School of Physics, University of Sydney, Sydney (Australia)

    2014-09-30

    Highlights: • PTFE surface becomes rough, carbonized and oxidized after ion implantation. • Ion implanted PTFE contains chemically active free radicals. • Cells adherence on ion implanted PTFE is improved. - Abstract: Polytetrafluorethylene (PTFE and ePTFE) substrates were treated by ion implantation with nitrogen ions of 20 keV energies and 10{sup 13}–10{sup 16} ions/cm{sup 2} ion fluences. The modification of the polymer surface was analyzed by FTIR and XPS spectroscopy, water wetting angle measurements and AFM images. The surface morphology, wettability and chemical activity were changed due to surface modification. The growing of endothelial cells of modified surfaces was improved in comparison with untreated PTFE and ePTFE substrates. The improved cell adherence on the modified surface is based on the improved adhesion of cell proteins.

  18. 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

  19. 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...

  20. 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 ...

  1. 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...

  2. Sheep Hip Arthroplasty Model of Failed Implant Osseointegration

    OpenAIRE

    Jakobsen, Thomas; Kold, Søren; Baas, Jørgen; Søballe, Kjeld; Rahbek, Ole

    2015-01-01

    Early secure stability of an implant is important for long-term survival. We examined whether micromotion of implants consistently would induce bone resorption and formation of a fibrous membrane and thereby prevent osseointegration. One micromotion implant was inserted into one of the medial femoral condyles in ten sheep. The micromotion device consists of an anchor bearing a PMMA implant and a PE plug. During each gait cycle the PE plug will make the PMMA implant axially piston 0.5 mm. Afte...

  3. Evaluation of efficacy dexamethasone intravitreal implant compared to treatment with anti-VEGF in the treatment of diabetic macular edema

    Directory of Open Access Journals (Sweden)

    Elena Pacella

    2014-12-01

    Full Text Available Objective: The study compares the effectiveness of an intravitreal slow-release dexamethasone implant respect to an intravitreal injection of a anti-VEGF, ranibizumab, in the treatment of diabetic macular edema (DME. Design: we used a non randomized retrospective study to compare the effectiveness of two treatment approaches to DME Subjects: 50 patients were investigated, 30 of whom underwent injections of ranibizumab and 20 of whom underwent dexamethasone implantation. Methods: When patients were injected with the anti-VEGF ranibizumab, they were monitored every three months. Dexamethasone implant was administered only once in 6 months, different to ranibizumab which was administered monthly . Main Outcome Measures: these were carried out by measuring the improvements in ETDRS (visual acuity scores and CMT (central macular thickness after one month, three months, and six months (T1, T3, T6. intraocular pressure were performed. Results: Data evidenced that the slow-release dexamethasone implant is more efficacious than the intravitreal injection of the anti-VEGF, ranibizumab, in terms of improvement of visual acuity and central macular thickness. Dexamethasone implant at T3 produced an improvement of visual acuity which was significantly better respect to injections of ranibizumab, with a mean ETDRS gain of nearly 8,5 letters, compared to only 4 letters gained in the case of ranibizumab injected patients. This significance, however, is lost by T6, (p=0.516, where those treated with dexamethasone had lost 6 of the eight letters gained, while those with ranibizumab had lost 4 letters. As such, the overall gain at the T6 checkpoint was only 2.5 letters for dexamethasone implant and 2 for ranibizumab. Conclusion: The study highlighted a better initial efficacy of the dexamethasone implant due to its superior performance at 3 and 6 month evaluation points.

  4. 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...

  5. Patients awareness and attitude towards dental implants

    OpenAIRE

    Kohli, Shivani; Bhatia, Shekhar; Kaur, Arvinder; Rathakrishnan, Tiviya

    2015-01-01

    Aims: The aim of the study was to assess the awareness of the patients regarding implant-retained prosthesis as an option for tooth replacement and the knowledge about tooth replacement as a whole including source of information and attitude towards it amongst Malaysian population. Materials and Methods: Information on demographic characteristics, knowledge about implant as an option for missing tooth replacement, source of information and knowledge about other options of tooth replacement we...

  6. 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...

  7. 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 ...

  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. 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...

  10. 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.

  11. 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.

  12. 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.

  13. 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...

  14. Implant-induced microdamage in osteoporotic bone

    OpenAIRE

    YU Zhi-feng; Tang, Ting-ting; QIU Shi-jing

    2012-01-01

    【Abstract】With the increase of elderly population, more and more implant operations need to be performed in osteoporotic bone, while different forms of microdamage will be produced in peri-implant bone intraoperatively, in-cluding high- and low-density diffuse damages, as well as linear cracks. The length and location of the microcracks are the main factors in affecting the biomechanical performance of bone. Suppression of bone remodeling by bisphosphonates may lead...

  15. 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 ...

  16. Biofeedback With Implanted Blood-Pressure Device

    Science.gov (United States)

    Rischell, Robert E.

    1988-01-01

    Additional uses found for equipment described in "Implanted Blood-Pressure-Measuring Device" (GSC-13042). Implanted with device electronic circuitry that measures, interprets, and transmits data via inductive link through patient's skin to external receiver. Receiver includes audible alarm generator activated when patient's blood pressure exceeds predetermined threshold. Also included in receiver a blood-pressure display, recorder, or both, for use by patient or physician.

  17. Composition and Modifications of Dental Implant Surfaces

    OpenAIRE

    Bruschi, Michela; Steinmüller-Nethl, Doris; Goriwoda, Walter; Rasse, Michael

    2015-01-01

    Since Brånemark discovered the favorable effects of titanium in bone healing in 1965, titanium has emerged as the gold standard bulk material for present-time dental implantology. In the course of years researchers aimed for improvement of the implants performance in bone even at compromised implant sites and multiple factors were investigated influencing osseointegration. This review summarizes and clarifies the four factors that are currently recognized being relevant to influence the tissu...

  18. 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 ...

  19. 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...

  20. 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.