1,720,964 research outputs found
Nostra esperienza sull’impiego di materiale osteoconduttore a base di corallo naturale nella metodica del sinus lift. Congresso Naz. Dei Docenti di Discipline Odontostomatologiche e Chirurgia Maxillo-Facciale. Roma 22-24 Aprile 2009
No full textOutcome of 47 consecutive sinus lift operations using aragonitic calcium carbonate associated with autologous platelet-rich plasma: clinical, histologic, and histomorphometrical evaluations.
No full textOutcome of 47 consecutive sinus lift operations using aragonitic calcium carbonate associated with autologous platelet-rich plasma: clinical, histologic, and histomorphometrical evaluations.
Papa F, Cortese A, Sagliocco R, Farella M, Banzi C, Maltarello MC, Pellegrini C, D'Agostino E, Aimola P, Claudio PP.
Source
Department of Odontostomatologic and Maxillo-Facial Sciences, University Federico II, Naples, Italy.
Abstract
BACKGROUND:
The reconstruction of the maxillary bone frequently represents a real challenge for maxillofacial surgeons especially regarding the best choice of a suitable material to produce the required bone augmentation.
AIM:
In this study, we summarize our clinical experience on 47 sinus lifts with lateral approach using a mixture of aragonitic calcium carbonate and autologous platelet-rich plasma compared with that of a previous published study in which bovine bone (LADDEC) and autologous bone were used in 50 sinus lift operations (Br J Oral Maxillofac Surg 2005;43:309-313).
MATERIALS AND METHODS:
We subjected 34 patients to sinus lift operation, for a total of 47 sinus lifts, using natural coral as osteoconductive material. This material, combined with autologous platelet-rich plasma, was placed onto the maxillary sinus floor, after carefully lifting the endosteum. Cases were clinically, radiographically, and histologically analyzed. Histomorphometrical analysis, tests of microhardness, and x-ray microanalysis were conducted comparing the various sample to controls obtained from the same patients.
RESULTS AND CONCLUSIONS:
Histomorphometrical analysis, microhardness test, and x-ray microanalysis demonstrated that the newly formed bone showed morphologic and structural characteristics that were similar for all the grafting materials compared (bovine bone, autologous bone, and coral). Although all the grafting materials did yield good results of maturation of the newly formed bone, best results were achieved using autologous bone.
PMID: 19881366 [PubMed - indexed for MEDLIN
Il perturbante e la psicologia del ritratto
No full textIl tema del perturbante (a partire dal testo di Freud del 1919, “Das Unheimliche”) è una cifra fondamentale per studiare la dimensione psicologica del ritratto. Esso non a caso ha origine nell’ambito dell’arte funeraria (come difesa contro la paura della morte, secondo la logica del “Doppio” analizzata da Otto Rank e da Freud) e sfrutta ampiamente i meccanismi collegati alla “magia dell’immagine”. I processi psicologici che caratterizzano le dinamiche del ritratto sono collegati soprattutto ai meccanismi di identificazione, sia di tipo proiettivo che introiettivo. Nel saggio, oltre a numerosi riferimenti alla psicoanalisi freudiana e post-freudiana, troviamo numerose esemplificazioni in ambito letterario. Infatti, come ricorda spesso Freud, gli scrittori hanno una particolare capacità di indagare l’inconscio e spesso hanno anticipato le scoperte della psicoanalisi. Per quanto riguarda le dinamiche relative al ritratto, nel testo si fa riferimento, tra gli altri, a E. A. Poe, “Il ritratto ovale”, N. Hawthorne, “I ritratti profetici”, N. V. Gogol, “Il ritratto”, O. Wilde, “Il ritratto di Dorian Gray”. Particolare attenzione viene poi dedicata al “paradosso” del ritratto psichiatrico e soprattutto ai meccanismi della sua fruizione
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
Absence of the ductus venosus: report of 10 new cases and review of the literature
No full textObjective: To assess the clinical significance of the absence of the ductus venosus. Design: A retrospective study with a review of the literature. Methods: The archives of our ultrasound laboratory and the English literature were searched for cases with a prenatal diagnosis of absence of the fetal ductus venosus. Results: Between 1985 and 2000, 10 fetuses were diagnosed in our center as having absence of the ductus venosus. The review of the literature revealed 23 cases. Three main patterns of abnormal venous circulation were documented: (1) umbilical vein bypassing the liver and connecting directly to the right atrium (46%); (2) umbilical vein bypassing the liver and connecting to the inferior vena cava mostly through one of the iliac veins (25%); (3) umbilical vein connecting to the portal circulation without giving rise to the ductus venosus (21%). Major anomalies, including chromosomal aberrations, were found in 8/33 (24%) cases. Hydrops developed in 11/33 (33%) cases. Twenty fetuses with isolated absence of the ductus venosus were delivered, and 5 (20%) died. The portal vein was found to be absent in half of the infants examined after birth. Conclusions: Our results and the review of literature suggest that absence of the ductus venosus is associated with a high incidence of fetal anomalies and adverse outcomes, including associated malformations, chromosomal aberrations, in utero heart failure and absence of the portal vein. Heart failure and absence of the portal vein seem particularly frequent when absence of the ductus venosus is associated with a connection of the umbilical vein to either the inferior vena cava or the right atrium
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
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