1,720,980 research outputs found
Autogenous cortical bone particles and enamel matrix derivative in the treatment of deep intraosseous defects: a 12-months case series
No full textThe aim of the present study was to investigate the effectiveness of
a regenerative procedure based on supracrestal soft tissue preservation
in association with combined autogenous cortical bone
particles (ACBP)/enamel matrix derivative (EMD) application in
the treatment of non-self supporting periodontal intraosseous
defects. Thirteen consecutively-treated patients, seven females and
six males, aged 30–65 years, two smokers, were included. A total of
14 deep, 1–2 wall intraosseous defects were selected. Pocket
probing depth (PPD), clinical attachment level (CAL), and gingival
recession (REC), at baseline and 12 months after surgery, were
recorded. PPD amounted to 9.1 ± 1.6 mm before surgery, and
decreased to 4.0 ± 1.4 mm post-surgery (PPD reduction: 5.1 ±
1.7 mm, P < 0.0000). CAL varied from 10.3 ± 1.5 mm presurgery
to 5.4 ± 1.7 mm post-surgery, with a CAL gain of
4.9 ± 1.8 mm (P < 0.0000). REC shifted from 1.1 ± 0.9 mm at
baseline to 1.4 ± 1.1 mm after surgery, REC change being
0.3 ± 0.8 mm (P > 0.05). Our results supported the effectiveness
of a regenerative procedure based on supracrestal soft tissue
preservation combined with ACBP/EMD in clinically and statistically
improving soft tissue conditions of non-self supporting
periodontal intraosseous defects
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
Soft tissues around long-term platform switching implant restorations : a histological human evaluation. Preliminary results
No full textBackground
Switching platform restorations seems to reduce the peri-implant bone resorption and to preserve the peri-implant soft tissues.
Aim
The aim of the present human study was to compare histologically the peri-implant soft tissue in switching and traditional platform implants 4 years after restoration.
Materials and Methods
Forty-eight months after implant restoration, 37 peri-implant soft tissue samples from 14 patients were harvested from traditionally restored implants (control group) and from three different platforms mismatching 0.25-0.85 mm (test groups). At the harvesting time, all sites were clinically healthy. Samples were processed to evaluate the inflammatory infiltrate area [inflamed connective tissue (ICT)], the microvascular density (MVD) and the collagen content (AA%).
Results
At the analyses, no significant differences were found between groups in terms of ICT, MVD and AA% (p > 0.05). In all groups, most samples with a well-preserved junctional epithelium showed a small and localized inflammatory infiltrated associated with not-well-oriented collagen fibres and an increased MVD.
Conclusions
Forty-eight months after restoration, switching and traditional platform implants had similar histological peri-implant soft tissue features, despite different bone level changes detected radiographically and published in a previous parent study. The present study seems to confirm platform switching as a safe prosthetic concept leading to better maintenance of peri-implant bone levels. However, further histological studies are required to longitudinally confirm the present data
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
RIASSORBIMENTO RADICOLARE DI UN INCISIVO PERMANENTE CAUSATO DA UN CANINO INCLUSO. CASO CLINICO
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