Utilidad clínica de la tomografía computarizada cone beam para definir conducta terapéutica en casos de mediana y alta complejidad endodóntica

Indexación: Scopus.The aim of this study was to evaluate the clinical utility of Cone Beam Computed Tomography (CBCT) in cases of medium and high endodontic complexity. The relevance of CBCT to define treatment was evaluated through the Wittenberg questionnaire and the variation in treatment plans after CBCT exam analysis. The sample (n=40) was chosen for convenience over a period of 4 months. It considered the current recommendations to request CBCT exams before performing root canal treatments. Data collection was carried out through a survey applied to the treating clinicians, after examining the information obtained by the CBCT system. Data were analyzed with the Stata version 13 software, and the Chi-square test was used for inferential analysis. A 95% confidence interval was considered. The most frequent dental groups corresponded to upper posterior and upper anterior teeth (47.5% and 30.0%); the cases were equally distributed according to complexity (50% and 50%). The main reason for requesting CBCT exams corresponded to complex anatomy and/or atypical canal system (37.5%). The use of CBCT increased confidence in the initial treatment chosen by clinicians in 50% of cases according to the Wittenberg questionnaire, and a 45% variation in treatment plans was observed. There was no statistical relationship between complexity and the variables studied. CBCT contributed greatly to the therapeutic management of cases regardless of their complexity.https://www.joralres.com/index.php/JOR/article/view/joralres.2019.06

Estimating stable isotope turnover rates of epidermal mucus and dorsal muscle for an omnivorous fish using a diet-switch experiment

© 2018, The Author(s). Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. Epidermal mucus (‘mucus’) potentially provides an alternative SI ‘tissue’ to dorsal muscle that can be collected non-invasively and non-destructively. Here, a diet-switch experiment using the omnivorous fish Cyprinus carpio and plant- and fish-based formulated feeds compared SI data between mucus and muscle, including their isotopic discrimination factors and turnover rates (as functions of time T and mass G, at isotopic half-life (50) and equilibrium (95)). Mucus isotope data differed significantly and predictively from muscle data. The fastest δ13C turnover rate was for mucus in fish on the plant-based diet (T50: 17 days, T95: 74 days; G50: 1.08(BM), G95: 1.40(BM)). Muscle turnover rates were longer for the same fish (T50: 44 days, T95: 190 days; G50: 1.13(BM), G95: 1.68(BM)). Longer half-lives resulted in both tissues from the fish-based diet. δ13C discrimination factors varied by diet and tissue (plant-based: 3.11–3.28‰; fishmeal: 1.28–2.13‰). Mucus SI data did not differ between live and frozen fish. These results suggest that mucus SI half-lives provide comparable data to muscle, and can be used as a non-destructive alternative tissue in fish-based SI studies

Entwicklung von Verfahrensgrundlagen zur biologischen Stickstoff-Eliminierung aus Betriebsabwaessern der Metallverarbeitung. T. A und Abschlussbericht

Wastewaters from electrochemical deburring of gear units and axles (EC-Water) and permeates obtained by ultrafiltration of coolants were treated in fixed bed reactors. In the denitrification and the subsequent aerobic stage 75% of the DOC were eliminated. Experiments to oxidise the residual DOC chemically showed that such a treatment step will be not economical. Nitrification was only possible if an pretreated industrial wastewater was dosed to the other wastewater streams resulting in a dilution of the permeate of 1/5. By treatment with pre-denitrification 90% of DOC and N_t_o_t_a_l were eliminated. By sludge-returnment higher loading rates could be obtained. The COD of the effluent was often greater than 300 mg O_2/l. The SVI was not greater than 130 ml/g. Automatic regulation of the C/N-ratio is till now not possible because of lacking of a reliable method to determine nitrogen online. The TN_b is an unreliable parameter for online process regulation. Inhibitors of nitrification are common ingredients of the coolants. In case of boron nitrification was possible up to a concentration of 700 mg/l B after a long adaption-time. In boronfree permeates of fresh coolants nitrification couldn't be established. 15% of DOC and organic nitrogen were persistent. Input of persistent DOC by sources of pollution like oil and washwaters seem to be neglectible. Jodpropinylbutylcarbamate (a fungizide) and Tolyltriazole, an ingredient of the emulsions to prevent dissolving of non-ferrous metals, were analysed for its inhibitory quality on microbial activity. (orig.)Available from TIB Hannover: F99B929+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman