1,720,959 research outputs found
Lichen planus gengivale : considerazioni preliminari nella programmazione chirurgica implantare
No full textTerapia fotodinamica nelle perimplantiti: studio clinico comparativo.
No full textOBJECTIVES. The aim of this study was to compare the effects of photodynamic therapy (PDT) associated to conventional therapy (CT) and CT alone on clinical and microbiological parameters in active peri-implantitis patients. MATERIALS AND METHODS. Twenty patients were enrolled in the study and they were divided into four groups, two test groups (treated by PDT + CT) and two control groups (treated by CT only), according to their bone defect depth. CT consisted in scaling associated to chlorexidine irrigation. In defects deeper than 2 mm a mucoperiosteal flap was carried out. PDT consisted in applying toluidine blue into peri-implantitis site and irradiating it with a diode laser for 1.5 minutes in continuous wave mode. Microbiological samples were obtained before, immediately after treatment and six months later. RESULTS. Mean global anaerobia bacterial count was reduced by 93.6% in test groups, vs 83.5% of control groups. Qualitative assay of pathogens showed a mean 3 log steps re-duction for P gingivalis e Prevotella intermedia and 2 log steps for A. actinomycetemcomitans in test groups, vs 2 log steps and 1 log step of reduction for the same species in the control groups. Microbiological assay six months later displayed a partial bacteria re-colonization. CONCLUSIONS. Progressive peri-implant bone loss accompanied by inflammatory lesions of soft tissues are referred to as peri-implantitis. The findings of this study suggest that photodynamic therapy can be considered a useful method associated to conventional therapy in order to reduce micro-organism in peri-implantitis affected sites
Photodynamic therapy to treat periimplantitis
No full textAim:Periimplantitis is a bacterial complication after dental implants implantation. Photodynamic therapy (PDT) implies the use of low-power laser in combination with appropriate photosensitizer to increase the detoxification of the implant surfaces. Little information exists about PDT in the treatment of periimplantitis. A randomized comparative case-control study has been conducted with 20 patients and 20 controls to compare the efficacy of antimicrobial PDT versus surgical therapy in patients with periimplantitis, who have received dental implants with rough surfaces.
Materials and Methods:In the surgery group, mucoperiosteal flap surgery was used with scaling on implant surfaces and debridement of granulation tissue. Microbiologic testing was evaluated before and after intervention treatment, at 12 and 24 weeks in the study subjects.
Discussion:Total anaerobic counts of bacteria did not differ significantly between patients assigned to receive PDT and those assigned to receive surgical therapy (mean, 95.2% and 80.85%, respectively). PDT was associated with a significant decrease in bleeding scores (P = 0.02) as well as inflammatory exudation (P = 0.001).
Conclusion:Treatment with PDT in patients with periimplantitis was not associated with major reduction of total anaerobic bacteria on the rough surfaces of dental implants as compared with surgical therapy. A significantly lower proinflammatory index of periimplantitis was observed in the PDT group at 24 weeks of follow-up
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
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