1,721,227 research outputs found
Periimplant diseases: where are we now?--Consensus of the Seventh European Workshop on Periodontology
No full textPeri-implant diseases present in two forms - peri-implant mucositis and peri-implantitis.sponsorship: This workshop has been financially supported by an unrestricted educational grant from Colgate. The sponsor had no impact on the program or on the deliberations of the European Workshop. Group participants declared that they had no conflict of interests. (Colgate)status: Publishe
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
Clinical research in implant dentistry: study design, reporting and outcome measurements: consensus report of Working Group 2 of the VIII European Workshop on Periodontology
No full textThe objective of this working group was to assess and make specific recommendations to improve the quality of reporting of clinical research in implant dentistry and discuss ways to reach a consensus on choice of outcomes.sponsorship: The authors declare that they have no conflict of interests. This workshop was financially supported by the European Federation of Periodontology and by unrestricted grants from Astra, Nobel Biocare and Straumann (European Federation of Periodontology, Astra, Nobel Biocare and Straumann)status: Publishe
Probiotische strategieën om orale ziektes te bestrijden
No full textA healthy mouth makes for a confident laugh and ensures us that we can enjoy that tasty steak or juicy apple. However, oral diseases can have consequences even beyond the mouth. Lately, there is a growing interest for the link between gum health and several systemic diseases. However, despite its far-reaching effects and a focus on prevention, oral health problems are still affecting the majority of the population worldwide. There is thus a need for alternative and/or complementary therapies in addition to the current preventive and therapeutic strategies.
In a healthy mouth, there is a symbiotic relationship, a dynamic balance between the oral microbiome, the host and the environment. A disturbance of this homeostasis can lead to an overgrowth of pathogenic bacteria. Traditional therapies focus on the reduction and elimination of the bacterial load. More recently, in line with previous gastrointestinal research, it was suggested that administering live, 'beneficial' microorganisms (probiotics) could be an alternative for restoring this homeostasis.
At the start of this PhD, the interest in using probiotics for a healthier mouth was already growing. Although the research was limited at that moment, the available results were promising (Chapter 1). However, there were still many unanswered questions concerning the ideal probiotics for oral health, uninvestigated applications, etc.
The most studied probiotic for oral health is, to the best of our knowledge, a dual strain lactobacilli probiotic containing Lactobacillus reuteri DSM 17938 and Lactobacillus reuteri ATCC PTA 5289. Research showed the added value of this product in the prevention of caries and as a complementary therapy in the non-surgical therapy of periodontitis. We demonstrated for the first time the additional effect of this product to re-instrumentation of residual pockets in chronic periodontitis patients. However, we failed to show an added effect after the administration of this product compared to a placebo as complementary treatment to the non-surgical debridement of initial peri-implantitis sites (Chapter 2).
Lactobacilli are of course only one example of microorganisms to which probiotic capacities are attributed. The third chapter of this thesis investigated the use of a streptococci probiotic and the clinical effects of oral health products containing Bacillus species. However, both studies could not show any added effects of these probiotics for the examined indications. The first trial failed to show better treatment results of a Streptococcus oralis KJ3, Streptococcus uberis KJ2 and Streptococcus rattus JH145 probiotic compared to a placebo used for 3 months after scaling and root planing in chronic periodontitis patients. In addition, the second study did not demonstrate improved clinical parameters of the usage of Bacillus species based probiotics compared to a placebo in gingivitis patients.
Combining the studies in this thesis and the current literature, one can conclude that probiotics can be an interesting, alternative strategy for improving oral health. However, it is important to note that probiotic effects depend on strain, concentration, mode of delivery and, moreover, are indication-specific. However, it is not clear what the underlying mechanisms of the seen clinical benefits of certain probiotics are.
In conclusion, there appear to be different applications for probiotics in dentistry, but more fundamental research is needed to use them in a targeted way, which in turn will lead to more effective usage of time and resources in clinical researchstatus: Publishe
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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