1,720,965 research outputs found
Caries prevention about inorganic fluoride: a SEM investigation.
No full textAIM To investigate the adaptation of new generation fiber post compared with prefabricated glass fiber postsMATERIAL AND METHODS The experiment was performed by two experienced clinicians, the former performed endodontic therapies and the latter post restorations. The clinical crowns of twenty human extracted teeth were sectioned at the cemento-enamel junction. The canals were shaped with MTwo NiTi rotary files up to 25 .07. Root canals were filled with guttapercha points with vertical condensation technique up to 5 mm to the apex. The middle and coronal part of the canal were cleaned with GG burs 1-4, used with very light touch. Adhesion technique, using 4th generation adhesives was performed. With a random number generator, at this point the roots were divided into two groups, 10 teeth each, A and B; group A was restored with a prefabricated fiber post, group B with a new generation Ever-stick post, made of preimpregnated fibers that can be packed into the canal. Both types of posts were cemented with flowable auto-photo composite, which was allowed to set for 15 minutes.The roots were then sectioned 3 mm from the coronal end with a rotating disk, polished and photographed with a camera on a fixed mount. The images were processed with software that allowed to measure the cement thickness from fibers to dentin, with 8 measures for each specimen. The numeric data were processed with a statistical program in order to evaluate differences between groups and its significance (quantitative analysis).Qualitative analysis was performed by two experienced independent observers, the accordance of whom was evaluated with Cohen K test, that gave to each specimen a score 0-3, accordingly to the presence or absence of defects, such as voids in the material or lack of adherence to dentinal walls. Kruskal-Wallis and Mann-Whitney tests were used to identify differences in the groups.RESULTS New generation fiber posts are a valuable alternative to preformed fiber posts
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Clinical testing of full mouth debridement protocol on patients in rehabilitation therapy for abuse of psychoactive drugs
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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