1,721,052 research outputs found
REGENERATIVE TREATMENT OF AN IMMATURE, TRAUMATIZED TOOTH WITH APICAL PERIODONTITIS. REPORT OF A CASE
No full textAbstract
This case report describes the treatment of a necrotic
immature permanent central incisor with complete
crown fracture, suspected root fracture, and sinus tract,
which was not treated with conventional apexification
techniques. Instead, a regenerative approach based on
the trauma literature’s methods for revascularization
was provided. The root canal was gently debrided of
necrotic tissue with a sharp spoon excavator and irrigated
for only one third of its length with NaOCl and
then medicated with calcium hydroxide. After 15 days
the sinus tract had healed, and the tooth was asymptomatic.
The tooth was accessed, calcium hydroxide
was removed, bleeding was stimulated to form an
intracanal blood clot, and mineral trioxide aggregate
was placed coronally to the blood clot. After 8 months,
a coronal calcified barrier was radiographically evident
and accompanied with progressive thickening of the
root wall and apical closure. Two and a half years after
treatment was initiated, the tooth remained asymptomatic,
and the sinus tract had not reappeared. The progressive
increase in the thickness of the dentinal walls
and subsequent apical development suggest that appropriate
biologic responses can occur with this type of
treatment of the necrotic immature permanent tooth
with sinus tract. (J Endod 2008;34:611– 616
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
The influence of operating parameters on the total productivity of diamond wire in cutting granite
No full textThis report describes a research project carried out at the DiGITA laboratories of the University of Cagliari in Italy, which had the objective of improving knowledge of the methods for predicting the total productivity of diamond wire. The study of the tool performance considers the variations in operating parameters such as the peripheral wire speed and the cutting rate
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