1,720,999 research outputs found
Influenza delle tecniche di sterilizzazione rapida sulle proprietà meccaniche degli strumenti endodontici
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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
Biomimetic Orthodontic treatments: preferences of adult patients and analysis of the willingness-to-pay index
No full textOBJECTIVES: Minimal knowledge is available concerning adult patient preferences and evaluations in terms of biomimetic orthodontic treatments. The first objective of this study was to evaluate the degree of acceptance of an orthodontic treatment accomplished with three different highly aesthetic orthodontic appliances: 1) clear removable aligners, group CA; 2) fixed vestibular appliances with aesthetic ceramic brackets, group FV; 3) fixed lingual appliances with customized brackets, group FL. The second objective was to analyse the strength of preference in a Western population of adult patients, expressed according to the Willingness-To-Pay (WTP) method, against an orthodontic treatment delivered with these appliances. MATERIALS AND METHODS: WTP values were recorded in 83 subjects on the basis of a starting bid of 3,000 £ (one year of therapy) modifiable through increases or decreases (100 £). Data were collected through an individually delivered online questionnaire. Specific information and details regarding the appliances were provided by means of an interactive web-area of the survey. Population characteristics and choices, median and WTP values and associations with socio-demographic parameters (Mann-Whitney and Kruskal-Wallis tests), correlations between variables (Chi-square test in contingency tables) and significant parameters for predicting WTP values obtained in a multiple linear regression model were revealed. RESULTS: The visualization of details about "limitations and complications" associated with the use of the three appliances was most frequent (31% of requests); the other two major areas of interest were "duration of therapy" (21%) and "discomfort" (13%). The appliances preferred by patients for treatment were, in decreasing order, CA (51.2%), FL (28.8%) and FV (20%); the recorded WTP median values were 3,500, 3,000 and 2,000 £ for FV, CA and FL respectively; no significant difference was found by comparing medians in the three groups (Wilcoxon test: p = 0.2254). An annual income higher than 30,000 £ and regular dental check-ups (once/year) were positive predictors (p = 0.0167 and p = 0.0020, respectively) of the WTP values (regression analysis). CONCLUSIONS: Over half the investigated population (51.2%) indicated the removable clear aligner as the preferential choice for a biomimetic treatment. Despite the high aesthetic value of CA and FL, patients didn't show a greater willingness to put efforts and money for a treatment specifically accomplished with one of those appliances
Adapting fiber-reinforced composite root canal posts for use in noncircular-shaped canals.
No full textPost placement in oval-shaped root canals implies the sacrifice of sound dental tissue to adapt the canal shape to fit the post, which can result in one of several significant complications. A semidirect, single-visit, chairside procedure is proposed, which permits the use of an almost anatomically shaped post, starting from a preformed fiber-reinforced composite root canal post of the largest size commercially available. The utilization of this post capitalizes on the advantages of both the fiber post and the anatomical post in oval- and ribbon-shaped canals to provide restoration of endodontically treated teeth
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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