1,720,966 research outputs found
Quantitative and Qualitative in vivo Analysis of Metal Residuals in the Saliva of Subjects with and without Fixed Orthodontic Appliances
Full text linkAim of the Work: The aim of this work was to evaluate Ni e Cr ions in the saliva of
subjects with and without fixed orthodontic appliances.
Materials and Methods: This was a prospective, non-randomized study of 100
patients, so selected: 50 have undergone fixed orthodontic appliance at least from
24 months; others 50 subjects as control-group, without any fixed and/or removable
orthodontic appliance It was conducted according to the Declaration of the World
Medical Association of Helsinki. The two selected groups were compatible for age, sex,
absence of restoration in amalgam or other metals in the oral cavity. The saliva of all the
subjects was collected with standardized sterile methods. The samples were analyzed
with an atomic absorption spectrophotometer instrument.
Results: Absolute values of the salivary metal ions in the subjects with fixed
orthodontic appliances are more than the values observed in the control group, but
these values are within the normal range.
Conclusion: The results show a greater presence in saliva of Ni and Cr ions in the
group with fixed orthodontic device. This research must be deepened because ions
released in saliva can have effects both locally and in distant districts
Aesthetics and smile: correlation between upper central incisor morphology and face shape
No full textAccuracy evaluation of orthodontic movements with aligners: a prospective observational study.
Full text linkAbstract
Background: Since their introduction in orthodontics, clear aligners have been appreciated by patients, including
adults, for their comfort and low aesthetic impact. Despite the enormous mobilization of financial resources all over
the world aimed at producing new product lines, few clinical studies or high-quality evidence have been produced
regarding the real effectiveness of such treatment. Given the few limited kinds of research on the subject, this study
aims to produce and critically evaluate other data, to establish the concrete reliability of clear aligners in orthodontic
therapy.
Results: Significant sample sizes were obtained for intrusion, vestibulo/lingual (V/L) crown tipping, and rotation. The
overall accuracy for rotation resulted in 86%, ranging from 96% for maxillary central incisors to 70.4% for mandibular
first premolars. The intrusion was registered only for anterior teeth; mean predictability was 92%, with the worst result
being 86.7% for mandibular canines and the best being 98% for mandibular central incisors. V/L tipping was the most
accurate movement: 93.1% of the prescribed movement was completed. Maxillary central incisors showed the lowest
accuracy (80.7%), while mandibular central incisors were the highest (97.5%).
Conclusions: The present study provided reassuring data in support of the accuracy of the Invisalign
® system. Vestibulo/
lingual tipping was the most predictable movement, while rotation of canines, premolars, and lateral incisors
were the least predictable. Intrusion resulted highly predictable up to 2 mm. When careful treatment planning follows
a correct diagnosis, together with the use of auxiliary features and refinements, the planned results can be achieved in
a clinically successful way. Authors believe that there is a major need for greater samples to overcome bias related to
variables if we want to answer the unsolved questions, such as the predictability of severe malocclusions treatment
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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