1,720,957 research outputs found
HISTOMORPHOMETRIC ANALYSIS OF NEW BONE FORMATION AFTER BILATERAL SINUS LIFT: A CASE REPORT
No full textAim: the aim of this case report was to compare new bone for- mation in grafting biomaterials with or without the addition of platelet-rich fibrin (PRF) by means of histomorphometric analysis.
Methods: bilateral sinus augmentation surgery was performed in a patient of 50 years old with severe maxilla atrophy. Graft in left sinus was performed only with Bio-Oss®, meanwhile in right sinus Bio-Oss® with the addition of PRF was applied. Af- ter 6 months, before dental implants insertion, cylindrical bone biopsies were developed in both grafting sites (T = 0). The bo- ne obtained was prepared with the Schenk method and analyzed quantitatively with a computer software. In the sam- ples were marked and distinguished: old bone, newly formed bone, Bio-oss® and connective tissue/bone marrow. After 10
years, before implants insertion, control bone biopsies were performed and analyzed with the identical procedures (T = 1). Results: at T = 0 no quantitative differences were observed in new bone and residual biomaterial in both sites. New bone for- mation was only peripherical in the left sinus, whereas it deve- loped both peripherally and through biomaterial in the right si- nus. At T = 1 a similar new bone formation was found, however in left sinus Bio-oss® particles were still present, while in right sinus they were not.
Conclusions: this case report showed that the adjunct of PRF led to a more homogeneous new bone formation and helped to complete long term biotransformation of biomaterial. Fur- ther studies are needed with a wider sample dimension to eva- luate this phenomenon
ASSESSMENT OF BILATERAL SINUS LIFT GRAFT VASCULARIZATION BY MAGNETIC RESONANCE IMAGING
No full textAim: the purpose of this work is to evaluate angiogenesis in grafting biomaterials with or without the addition of platelet- rich fibrin (PRF) by means of contrast-enhanced magnetic re- sonance imaging (CE-MRI).
Methods: bilateral sinus augmentation surgery was performed in a patient of 50 years old with severe maxilla atrophy. The left sinus was grafted only with Bio-Oss®, while in the right sinus Bio-Oss® with the addition of PRF was applied. CE-MRI was performed before the surgery (T0), 11, 25, 53, and 104 days af- ter surgery. Analysis were performed with STIR and conventio- nal TSE T1 weighted sequences. Subsequently, dynamic scans and SPIR sequences after the endovascular injection of a contrast agent were used. Images were examined to evalua- te angiogenesis by the enhancement of the contrast agent in the two different grafts.
Results: after 11 days an equivalent peripherical enhance- ment was visible in both grafting sites.
At 25, 53 and 104 days a circumferential peripherical enhance- ment was visible, while it was not in the central area of the left sinus graft.
The right side showed a wider enhancement of the whole graft starting from 25 days, growing progressively in all successive analysis, and becoming massive at 104 days.
Conclusions: CE-MRI offers quantitative parameters to evaluate vascularization of biomaterials. This case report showed that vascularization progressively increased centri- petally around Bio-oss® graft, whereas appeared to be more uniform and well represented in Bio-oss® with the addition of PRF.
Further studies are needed to confirm this different trend.Sinus lif
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
Variations 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
