32 research outputs found

    High-Yield Production and Transfer of Graphene Flakes Obtained by Anodic Bonding

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    We report large-yield production of graphene flakes on glass by anodic bonding. Under optimum conditions, we counted several tens of flakes with lateral size around 20-30 {\mu}m and few tens of flakes with larger size. 60-70% of the flakes have negligible D peak. We show that it is possible to easily transfer the flakes by wedging technique. The transfer on silicon does not damage graphene and lowers the doping. The charge mobility of the transferred flakes on silicon is of the order of 6000 cm^2/V s (at carrier concentration of 10^12 cm^-2), which is typical for devices prepared on this substrate with exfoliated graphene.Comment: 17 pages, 6 figures; ACS Nano 201

    Combining bioengineered human skin with bioprinted cartilage for ear reconstruction

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    Microtia is a congenital disorder that manifests as a malformation of the external ear leading to psychosocial problems in affected children. Here, we present a tissue-engineered treatment approach based on a bioprinted autologous auricular cartilage construct (EarCartilage) combined with a bioengineered human pigmented and prevascularized dermo-epidermal skin substitute (EarSkin) tested in immunocompromised rats. We confirmed that human-engineered blood capillaries of EarSkin connected to the recipient’s vasculature within 1 week, enabling rapid blood perfusion and epidermal maturation. Bioengineered EarSkin displayed a stratified epidermis containing mature keratinocytes and melanocytes. The latter resided within the basal layer of the epidermis and efficiently restored the skin color. Further, in vivo tests demonstrated favorable mechanical stability of EarCartilage along with enhanced extracellular matrix deposition. In conclusion, EarCartilage combined with EarSkin represents a novel approach for the treatment of microtia with the potential to circumvent existing limitations and improve the aesthetic outcome of microtia reconstruction

    NC-gestĂŒtzte Fertigung von Bohrschablonen fĂŒr die dentale Implantation

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    Einleitung Bei Zahnverlust ist das Setzen eines Implantates eine gĂ€ngige und etablierte Behandlungsmethode. Zahnimplantate bieten fĂŒr den Patienten viele Vorteile. Im Vergleich zum Einsatz einer klassischen BrĂŒcke mĂŒssen keine NachbarzĂ€hne beschliffen werden. Gesunde Zahnsubstanz bleibt erhalten. Der kĂŒnstliche Zahn sitzt fest und sicher im Kiefer und bietet Schutz vor Knochenverlust. Ein Implantat leitet die beim Kauen entstehenden KrĂ€fte gleichmĂ€ĂŸig in den Kieferknochen. Ein weiterer Vorteil ist die Sicherstellung der natĂŒrlichen Funktionen wie Kauen, Sprechen oder Lachen. Somit trĂ€gt implantatgetragener Zahnersatz erheblich zur Verbesserung der LebensqualitĂ€t bei. Zur Planung des chirurgischen Eingriffs und dem eigentlichen Setzen des Implantates sind die ZahnĂ€rzte und Zahntechniker auf Softwarelösungen angewiesen, welche nicht nur die Möglichkeit der Befundung, Analyse und Diagnostik bieten, sondern gleichermaßen die Informationen liefern, die erforderlich sind, um mit Hilfe eines Computers die Fertigung einer Bohrschablone zu planen (CAM-System) und mittels CNC-Fertigung herzustellen

    Risk for pelvic metastasis and role of pelvic lymphadenectomy in node-positive vulvar cancer - results from the AGO-VOP.2 QS vulva study

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    Simple Summary In node-positive vulvar squamous cell cancer, questions of when and how to perform pelvic lymphadenectomy (LAE) as well as the optimal extent of pelvic treatment in general have been surrounded by considerable controversy. In Germany, systematic pelvic LAE is currently recommended as a staging procedure in patients at risk for pelvic nodal involvement in order to prevent morbidity caused by pelvic radiotherapy (RT) in patients without histologically-confirmed pelvic involvement. However, the population at risk for pelvic metastases remains insufficiently described, resulting in the potential overtreatment of a considerable proportion of patients with groin-positive disease. This applies to the indication to perform surgical staging but also to adjuvant RT of the pelvis without previous pelvic staging. Our study aims to describe the risk for pelvic lymph node metastasis with regard to positive groin nodes and to clarify the indication criteria for pelvic treatment in node-positive vulvar cancer. Abstract The need for pelvic treatment in patients with node-positive vulvar cancer (VSCC) and the value of pelvic lymphadenectomy (LAE) as a staging procedure to plan adjuvant radiotherapy (RT) is controversial. In this retrospective, multicenter analysis, 306 patients with primary node-positive VSCC treated at 33 gynecologic oncology centers in Germany between 2017 and 2019 were analyzed. All patients received surgical staging of the groins; nodal status was as follows: 23.9% (73/306) pN1a, 23.5% (72/306) pN1b, 20.4% (62/306) pN2a/b, and 31.9% (97/306) pN2c/pN3. A total of 35.6% (109/306) received pelvic LAE; pelvic nodal involvement was observed in 18.5%. None of the patients with nodal status pN1a or pN1b and pelvic LAE showed pelvic nodal involvement. Taking only patients with nodal status ≄pN2a into account, the rate of pelvic involvement was 25%. In total, adjuvant RT was applied in 64.4% (197/306). Only half of the pelvic node-positive (N+) patients received adjuvant RT to the pelvis (50%, 10/20 patients); 41.9% (122/291 patients) experienced recurrent disease or died. In patients with histologically-confirmed pelvic metastases after LAE, distant recurrences were most frequently observed (7/20 recurrences). Conclusions: A relevant risk regarding pelvic nodal involvement was observed from nodal status pN2a and higher. Our data support the omission of pelvic treatment in patients with nodal status pN1a and pN1b

    Komplikationsmanagement in der Narbenhernienchirurgie - Erhalt von alloplastischem Material in der Infektsituation

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    Komplikationsmanagement in der laparoskopischen IPOM-Hernienreparatur

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    NC-gestĂŒtzte Fertigung von Bohrschablonen fĂŒr die dentale Implantation

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    Einleitung Bei Zahnverlust ist das Setzen eines Implantates eine gĂ€ngige und etablierte Behandlungsmethode. Zahnimplantate bieten fĂŒr den Patienten viele Vorteile. Im Vergleich zum Einsatz einer klassischen BrĂŒcke mĂŒssen keine NachbarzĂ€hne beschliffen werden. Gesunde Zahnsubstanz bleibt erhalten. Der kĂŒnstliche Zahn sitzt fest und sicher im Kiefer und bietet Schutz vor Knochenverlust. Ein Implantat leitet die beim Kauen entstehenden KrĂ€fte gleichmĂ€ĂŸig in den Kieferknochen. Ein weiterer Vorteil ist die Sicherstellung der natĂŒrlichen Funktionen wie Kauen, Sprechen oder Lachen. Somit trĂ€gt implantatgetragener Zahnersatz erheblich zur Verbesserung der LebensqualitĂ€t bei. Zur Planung des chirurgischen Eingriffs und dem eigentlichen Setzen des Implantates sind die ZahnĂ€rzte und Zahntechniker auf Softwarelösungen angewiesen, welche nicht nur die Möglichkeit der Befundung, Analyse und Diagnostik bieten, sondern gleichermaßen die Informationen liefern, die erforderlich sind, um mit Hilfe eines Computers die Fertigung einer Bohrschablone zu planen (CAM-System) und mittels CNC-Fertigung herzustellen
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